US20110290228A1 - Warm air furnace - Google Patents
Warm air furnace Download PDFInfo
- Publication number
- US20110290228A1 US20110290228A1 US12/789,692 US78969210A US2011290228A1 US 20110290228 A1 US20110290228 A1 US 20110290228A1 US 78969210 A US78969210 A US 78969210A US 2011290228 A1 US2011290228 A1 US 2011290228A1
- Authority
- US
- United States
- Prior art keywords
- combustion
- combustor
- air
- case
- room temperature
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Abandoned
Links
- 238000002485 combustion reaction Methods 0.000 claims abstract description 143
- 239000002737 fuel gas Substances 0.000 claims description 13
- 239000000567 combustion gas Substances 0.000 claims description 4
- 230000008014 freezing Effects 0.000 abstract description 5
- 238000007710 freezing Methods 0.000 abstract description 5
- 239000007789 gas Substances 0.000 description 21
- 239000000446 fuel Substances 0.000 description 18
- 238000000034 method Methods 0.000 description 3
- 230000003247 decreasing effect Effects 0.000 description 2
- 238000010438 heat treatment Methods 0.000 description 2
- 239000007788 liquid Substances 0.000 description 2
- 238000005273 aeration Methods 0.000 description 1
- 238000013459 approach Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
Images
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24H—FLUID HEATERS, e.g. WATER OR AIR HEATERS, HAVING HEAT-GENERATING MEANS, e.g. HEAT PUMPS, IN GENERAL
- F24H9/00—Details
- F24H9/20—Arrangement or mounting of control or safety devices
- F24H9/2064—Arrangement or mounting of control or safety devices for air heaters
- F24H9/2085—Arrangement or mounting of control or safety devices for air heaters using fluid fuel
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23N—REGULATING OR CONTROLLING COMBUSTION
- F23N5/00—Systems for controlling combustion
- F23N5/24—Preventing development of abnormal or undesired conditions, i.e. safety arrangements
- F23N5/242—Preventing development of abnormal or undesired conditions, i.e. safety arrangements using electronic means
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24H—FLUID HEATERS, e.g. WATER OR AIR HEATERS, HAVING HEAT-GENERATING MEANS, e.g. HEAT PUMPS, IN GENERAL
- F24H15/00—Control of fluid heaters
- F24H15/20—Control of fluid heaters characterised by control inputs
- F24H15/254—Room temperature
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24H—FLUID HEATERS, e.g. WATER OR AIR HEATERS, HAVING HEAT-GENERATING MEANS, e.g. HEAT PUMPS, IN GENERAL
- F24H15/00—Control of fluid heaters
- F24H15/30—Control of fluid heaters characterised by control outputs; characterised by the components to be controlled
- F24H15/355—Control of heat-generating means in heaters
- F24H15/36—Control of heat-generating means in heaters of burners
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24H—FLUID HEATERS, e.g. WATER OR AIR HEATERS, HAVING HEAT-GENERATING MEANS, e.g. HEAT PUMPS, IN GENERAL
- F24H3/00—Air heaters
- F24H3/02—Air heaters with forced circulation
- F24H3/06—Air heaters with forced circulation the air being kept separate from the heating medium, e.g. using forced circulation of air over radiators
- F24H3/08—Air heaters with forced circulation the air being kept separate from the heating medium, e.g. using forced circulation of air over radiators by tubes
- F24H3/087—Air heaters with forced circulation the air being kept separate from the heating medium, e.g. using forced circulation of air over radiators by tubes using fluid fuel
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23N—REGULATING OR CONTROLLING COMBUSTION
- F23N2227/00—Ignition or checking
- F23N2227/32—Igniting for a predetermined number of cycles
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24D—DOMESTIC- OR SPACE-HEATING SYSTEMS, e.g. CENTRAL HEATING SYSTEMS; DOMESTIC HOT-WATER SUPPLY SYSTEMS; ELEMENTS OR COMPONENTS THEREFOR
- F24D19/00—Details
- F24D19/0095—Devices for preventing damage by freezing
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24D—DOMESTIC- OR SPACE-HEATING SYSTEMS, e.g. CENTRAL HEATING SYSTEMS; DOMESTIC HOT-WATER SUPPLY SYSTEMS; ELEMENTS OR COMPONENTS THEREFOR
- F24D2200/00—Heat sources or energy sources
- F24D2200/04—Gas or oil fired boiler
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24H—FLUID HEATERS, e.g. WATER OR AIR HEATERS, HAVING HEAT-GENERATING MEANS, e.g. HEAT PUMPS, IN GENERAL
- F24H15/00—Control of fluid heaters
- F24H15/10—Control of fluid heaters characterised by the purpose of the control
- F24H15/136—Defrosting or de-icing; Preventing freezing
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24H—FLUID HEATERS, e.g. WATER OR AIR HEATERS, HAVING HEAT-GENERATING MEANS, e.g. HEAT PUMPS, IN GENERAL
- F24H15/00—Control of fluid heaters
- F24H15/20—Control of fluid heaters characterised by control inputs
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24H—FLUID HEATERS, e.g. WATER OR AIR HEATERS, HAVING HEAT-GENERATING MEANS, e.g. HEAT PUMPS, IN GENERAL
- F24H15/00—Control of fluid heaters
- F24H15/30—Control of fluid heaters characterised by control outputs; characterised by the components to be controlled
- F24H15/305—Control of valves
- F24H15/31—Control of valves of valves having only one inlet port and one outlet port, e.g. flow rate regulating valves
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24H—FLUID HEATERS, e.g. WATER OR AIR HEATERS, HAVING HEAT-GENERATING MEANS, e.g. HEAT PUMPS, IN GENERAL
- F24H15/00—Control of fluid heaters
- F24H15/30—Control of fluid heaters characterised by control outputs; characterised by the components to be controlled
- F24H15/345—Control of fans, e.g. on-off control
Definitions
- the present invention relates to a warm air furnace having a combustion operation control function which carries out an ignition action again in the case where combustion is discontinued during combustion operation due to lack of gas.
- a combustion appliance equipped with a burner for combusting a liquid fuel, a fuel supplier for supplying the fuel to the burner, a fuel detector for detecting existence or nonexistence of the fuel, and a combustion control unit which controls the fuel supplier and makes the burner carry out combustion, wherein the combustion appliance carries out an ignition action again in the case where combustion is discontinued during combustion operation due to lack of gas (refer to Japanese patent laid-open No. H09-280558).
- This combustion appliance is a combustion appliance which temporarily stops the combustion with a signal from the fuel detector indicating nonexistence of fuel, and starts counting of a predetermined period of time by a timer.
- the combustion appliance automatically restarts combustion. After lapse of the predetermined period of time, the combustion appliance does not restart combustion even when the signal from the fuel detector indicating existence of fuel is received.
- combustion is not restarted after lapse of the predetermined period of time even when the signal from the fuel detector indicating existence of fuel is received, so that there is a problem that room temperature drops and household articles freezes when a house in frigid climate is emptied for a long period of time.
- an object of the present invention is to provide a warm air furnace capable of preventing household articles from freezing in the case where combustion is discontinued during combustion operation due to lack of gas when a house is emptied.
- the present invention provides a warm air furnace comprising an air intake which takes in air; a combustor which is supplied with air taken in by the air intake and the fuel gas, and which combusts the same; an exhauster which exhausts a combustion gas combusted at the combustor to outdoors; a heat exchanger which is provided at the exhauster and which is for conducting heat of the combustion gas to indoor air; an air blower which blows the indoor air so as to receive heat from the heat exchanger; a combustion operation controller which controls operation of the combustor; and a retry operation controller which carries out the ignition action of the combustor in the case where a predetermined period of time lapsed from the time it is determined that the combustion at the combustor is discontinued during combustion operation by the combustion operation controller, determines whether or not the combustion at the combustor is started, and repeats the ignition action of igniting the combustor, in the case where it is determined that the predetermined period of time lapsed
- the warm air furnace includes the retry operation controller which repeats the action of igniting the combustor until it is determined that the combustion is started at the combustor in the case where the predetermined time lapsed from the time it is determined that the combustion is discontinued at the combustor during combustion operation by the combustion operating controller, so that in the case where the combustion is discontinued due to lack of gas during combustion operation in an emptied house in frigid climate, the combustion operation is restarted when the fuel is supplied. By doing so, it becomes possible to prevent the household articles from freezing.
- the retry operation controller carries out the ignition action of igniting the combustor in the case where a difference between a target room temperature set by a room temperature setting switch and a detected room temperature detected by a room temperature sensor becomes equal to or more than a predetermined temperature, and the predetermined time lapses.
- the present invention it becomes possible to ignite the combustor in order to prevent the household articles from freezing, in the case where the predetermined period of time lapsed after the detected temperature drops greatly (exceeding the predetermined temperature difference) below the target room temperature.
- the air intake is comprised of an air intake tube which takes in outdoor air. According to the present invention, it is possible to apply the same to a forced flue type warm air furnace which takes in outdoor air.
- the air intake is comprised of an air intake tube which takes in indoor air. According to the present invention, it is possible to apply the same to a closed flue type warm air furnace which takes in indoor air.
- FIG. 1 is a system configuration view of an example of a warm air furnace according to the present invention
- FIG. 2 is a control block diagram of the warm air furnace shown in FIG. 1 ;
- FIG. 3 is a flow chart showing a retry operation control process in FIG. 2 .
- a warm air furnace is for example a forced flue type gas warm air furnace.
- a main body case 1 of the warm air furnace arranged inside a room is equipped at the interior thereof with an air blow flue 2 , an air blow fan 3 which is an air blower for convecting indoor air via the air blow flue 2 , and a combustion device main body 4 for heating the indoor air flowing through the air blow flue 2 .
- the combustion device main body 4 is equipped with a burner 5 which is a combustor, a combustion chamber 6 accommodating the burner 5 , and a heat exchanger 7 which is a thermal exchanger continuing to the combustion chamber 6 .
- the combustion chamber 6 is connected with an air intake tube 8 for combustion air, and is also connected with an exhaust tube 9 which is an exhauster of combustion exhaust via the heat exchanger 7 .
- the air intake tube 8 and the exhaust tube 9 are extended to the outside of the main body case 1 , and are lead out outdoors.
- the air intake tube 8 is provided with a combustion fan 10 for supplying combustion air to the burner 5 inside the combustion chamber 6 .
- the combustion fan 10 is configured from a rotary vane 11 provided inside the air intake tube 8 so as to be able to rotate freely, and a combustion fan motor 12 for rotary driving the rotary vane 11 .
- the air intake tube 8 and the combustion fan 10 constitute the air intake of the present invention.
- the burner 5 inside the combustion chamber 6 is connected to a gas supply pipe 13 introduced from outside of the main body case 1 , and the fuel gas supplied from the gas supply pipe 13 is mixed with the combustion air introduced into the combustion chamber 6 from the air intake tube 8 , so as to combust the air-fuel mixture.
- an ignition electrode 14 for igniting the burner 5 and a flame detector 15 such as a flame rod or a thermocouple for detecting flame of the burner 5 are provided facing the burner 5 .
- the gas supply pipe 13 is disposed with two on-off solenoid valves 16 , 17 , and a gas proportional valve 18 .
- the air blow flue 2 includes an air inlet 19 and an air outlet 20 at the rear surface and the front surface of the main body case 1 , respectively, and is formed through the heat exchanger 7 in between the air inlet 19 and the air outlet 20 .
- the air inlet 19 is mounted with an air filter 21
- the air outlet 20 is fixed with a louver 22 for adjusting the direction of blowout of the warm air.
- the air blow fan 3 is configured from a rotary vane 24 provided inside the air blow flue 2 facing the air inlet 19 of the air blow flue 2 , and an air blow fan motor 25 for rotary driving the rotary vane 24 .
- the air blow fan 3 takes in indoor air into the air blow flue 2 by the rotation of the rotary vane 24 via the air inlet 19 . Then, the air blow fan 3 flow the air taken into the air blow flue 2 towards the air outlet 20 within the air blow flue 2 via the heat exchanger 7 , and blows out the air into the room from the air outlet 20 .
- the air blow flue 2 is provided with a room temperature sensor 26 which detects the temperature of the indoor air taken in by the air blow fan 3 as the room temperature at a position facing the air inlet 19 .
- the gas warm air furnace of the present embodiment is equipped with a controller 27 which carries out operation control via the solenoid valves 16 , 17 , the gas proportional valve 18 , the combustion fan motor 12 , the air blow fan motor 25 , and the ignition electrode 14 , an operation switch 28 for the user to instruct on/off of operation, a retry operation setting switch 29 for setting execution of a retry operation to be explained later, and a manipulating device 31 including a room temperature setting switch 30 for setting a target room temperature for combustion operation and the like.
- the controller 27 is equipped with, as means for realizing the functions according to the present invention, a combustion operation controller 32 (this includes a retry operation controller 33 described later), and a temperature adjustment controller 34 .
- the combustion operation controller 32 carries out control of the combustion operation, when operation start is instructed by the operation switch 28 , on the basis of a combustion amount determined at the temperature adjustment controller 34 .
- the temperature adjustment controller 34 is equipped with a combustion amount determining unit 35 .
- the combustion amount determining unit 35 determines the combustion amount (heating amount) of the burner 5 on the basis of the difference between the target room temperature and the detected temperature detected by the room temperature sensor 26 , while taking the temperature set by the room temperature setting switch 30 as the target room temperature.
- the combustion amount determining unit 35 momentarily obtains the necessary combustion amount of the burner 5 , on the basis of the difference between the detected temperature by the room temperature sensor 26 and the set room temperature for combustion operation (target room temperature during combustion operation) by the room temperature setting switch 30 .
- the combustion operation controller 32 controls the supply amount of the fuel gas and the combustion air to the burner 5 via the gas proportional valve 18 and the combustion fan motor 12 , respectively, so as to make the burner 5 combust at the necessary combustion amount.
- the combustion amount determining unit 35 carries out the temperature adjustment operation of the warm air furnace by controlling the air blow fan motor 25 so that an air volume of the air blow fan 3 according to the necessary combustion amount of the burner 5 is obtained.
- combustion operation controller 32 may carry out a forced high operation in which combustion operation with comparatively high heat quantity is executed forcibly, and a forced low operation in which combustion operation with comparatively low heat quantity is executed forcibly.
- the retry operation controller 33 carries out control to retry the ignition action each time after lapse of a predetermined period of time until the fuel gas is supplied, in the case where the operation start is instructed by the retry operation setting switch 29 and the combustion is discontinued during combustion operation due to lack of fuel gas.
- a predetermined target room temperature is preliminarily set by the room temperature setting switch 30 before combustion operation.
- the controller 27 actuates the combustion fan 10 , and then makes the ignition electrode 14 generate spark discharge for a predetermined period of time, as well as opens the solenoid valves 16 , 17 and the gas proportional valve 18 of the gas supply pipe 13 to start supply of a predetermined amount of fuel gas to the burner 5 . Thereby, ignition process of the burner 5 is carried out. Thereafter, ignition of the burner 5 is confirmed by the flame detector 15 .
- the controller 27 controls the air blow fan motor 25 so as to actuate the air blow fan 3 . Accordingly, indoor air is taken in to the air blow flue 2 via the air inlet 21 .
- the air taken in is heated via the heat exchanger 7 , which is heated by the combustion heat of the burner 5 , during flowing through the air blow flue 2 towards the air outlet 20 , and is blown out from the air outlet 20 as a warm air.
- the temperature adjustment controller 34 determines the combustion amount of the burner 5 according to the difference between the detected temperature of the room temperature sensor 26 and the target room temperature as described above, and the combustion operation controller 32 controls the combustion action of the burner 5 and the air volume of the air blow fan 3 . By doing so, the temperature adjustment control is carried out.
- the combustion amount of the burner 5 is decreased, and the air volume of the warm air is decreased by lowering the rotation speed of the air blow fan 3 , as the detected room temperature by the room temperature sensor 26 approaches the target room temperature.
- the combustion amount of the burner 5 is increased, and the air volume of the warm air is increased by raising the rotation speed of the air blow fan 3 .
- the combustion operation is stopped, the solenoid valves 16 , 17 and the gas proportional valve 18 of the gas supply pipe 13 are closed to stop the supply of the fuel gas to the burner 5 , the fire at the burner 5 is extinguished, and the combustion fan 10 and the air blow fan 3 are stopped.
- the controller 27 executes the retry operation control process to be explained hereinafter by the combustion operation controller 32 including the retry operation controller 33 .
- the controller 27 carries out the temperature adjustment operation with the combustion operation controller 32 and the temperature adjustment controller 34 (STEP 1 ). Thereafter, whether or not the combustion at the burner 5 is discontinued during the temperature adjustment operation is determined on the basis of the output of the flame detector 15 which detects the flame of the burner 5 (STEP 2 ).
- the combustion operation controller 32 continues the temperature adjustment operation.
- the combustion operation controller 32 stops the temperature adjustment operation (STEP 3 ). That is, the combustion operation controller 32 closes the solenoid valves 16 , 17 and the gas proportional valve 18 of the gas supply pipe 13 to stop the supply of the fuel gas to the burner 5 , extinguishes the fire at the burner 5 , and stops the combustion fan 10 and the air blow fan 3 .
- the warm air furnace stands by until the difference between the target room temperature set by the room temperature setting switch 30 and the detected room temperature detected by the room temperature sensor 26 becomes equal to or more than the predetermined temperature.
- the controller 27 carries out an ignition action for igniting the burner 5 with the ignition electrode 14 , by actuating the combustion fan 10 , making the ignition electrode 14 generate spark discharge for a predetermined period of time, and starting the supply of fuel gas of a predetermined amount to the burner 5 by opening the solenoid valves 16 , 17 and the gas proportional valve 18 of the gas supply pipe 13 (STEP 5 ). Further, the controller 27 starts actuation of the air blow fan 3 by controlling the air blow fan motor 25 .
- the controller 27 determines whether or not the combustion is started at the burner 5 by the ignition action, on the basis of the output of the flame detector 15 which detects the flame of the burner 5 (STEP 6 ).
- the controller 27 carries out the forced high operation with the combustion operation controller 32 (STEP 7 ).
- the controller 27 carries out the retry action of the ignition action.
- the controller 27 determines whether or not the discontinuation of combustion occurred during the forced high operation, on the basis of the output of the flame detector 15 which detects the flame of the burner 5 (STEP 8 ).
- the controller 27 returns to STEP 1 and carries out the temperature adjustment operation.
- the controller 27 carries out the ignition action of igniting the burner 5 with the ignition electrode 14 (STEP 9 ).
- the controller 27 determines whether or not the combustion at the burner 5 is started by the ignition action, on the basis of the output of the flame detector 15 which detects the flame of the burner 5 (STEP 10 ).
- the controller 27 continues the forced high operation.
- the controller 27 carries out the retry action of the ignition action.
- the controller 27 determines whether or not a predetermined period of time has lapsed from the ignition action (STEP 11 ).
- the controller 27 waits until the predetermined period of time lapses from the ignition action.
- the controller 27 carries out the ignition action of igniting the burner 5 with the ignition electrode 14 (STEP 12 ).
- the controller 27 determines whether or not the combustion at the burner 5 is started by the ignition action, on the basis of the output of the flame detector 15 which detects the flame of the burner 5 (STEP 13 ).
- the controller 27 returns to STEP 11 , and determines again whether the predetermined period of time has lapsed from the previous ignition action.
- the controller 27 carries out the forced high operation.
- controller 27 repeats the processing of STEP 11 through STEP 13 , until the determination result in STEP 13 becomes YES (until the combustion at the burner 5 is started by the ignition action).
- the processing in STEP 2 and STEP 8 corresponds to the determination on discontinuation of combustion of the present invention.
- the processing in STEP 5 , STEP 9 and STEP 12 corresponds to the ignition action of the present invention.
- the processing in STEP 11 corresponds to the determination on lapse of predetermined period of time of the present invention.
- the processing in STEP 6 , STEP 10 , and STEP 13 corresponds to the determination on start of combustion of the present invention.
- the repeating of the processing in STEP 11 through STEP 13 corresponds to the retry operation control of the present invention.
- the controller 27 carries out the processing of determining whether or not the predetermined period of time had lapsed after it is determined that combustion did not start until it is determined that combustion is started. Thereafter, by carrying out the retry operation control of repeating the ignition action in the case where it is determined that the predetermined period of time had lapsed, the combustion operation is restarted when the fuel gas is supplied, so that it is possible to prevent household articles from freezing when a house in frigid climate is emptied even in the case where the combustion at the burner 5 is extinguished due to lack of fuel gas during combustion operation.
- a forced flue type warm air furnace which takes in combustion air from outdoors with a combustion fan and forcibly exhausting to the outdoors.
- the present invention is not limited thereto.
- the present invention may be applied to a forced exhaust type warm air furnace which takes in combustion air from indoors and forcibly exhausts to outdoors with an air blower, or a closed flue system type warm air furnace which takes in combustion air from indoors and exhaust to the outdoors by a natural aeration force with an exhaust stack.
- the present invention may be applied not only to a warm air furnace using gas fuel but also to a warm air furnace using liquid fuel.
- the present invention is not limited to a combustion type warm air furnace, and it is possible to obtain a similar effect by applying the retry operation control of the present invention as long as it is a warm air furnace including a heat exchanger.
Abstract
A warm air furnace prevents household articles from freezing in the case where combustion is discontinued due to lack of gas during combustion operation when a house is emptied. The warm air furnace is equipped with a retry operation controller 33 which carries out ignition action of a combustor 5, in the case where a predetermined period of time lapsed from the time it is determined that combustion at the combustor 5 is discontinued during combustion operation by a combustion operation controller which controls operation of the combustor, determines whether or not combustion at the combustor 5 is started, and repeats the ignition action for igniting the combustor 5 until it is determined that combustion at the combustor 5 is started, in the case where a predetermined time lapsed from the time it is determined that the combustion at the combustor 5 is not started.
Description
- 1. Field of the Invention
- The present invention relates to a warm air furnace having a combustion operation control function which carries out an ignition action again in the case where combustion is discontinued during combustion operation due to lack of gas.
- 2. Description of the Related Art
- Conventionally, as the type of the warm air furnace explained above, there is known a combustion appliance equipped with a burner for combusting a liquid fuel, a fuel supplier for supplying the fuel to the burner, a fuel detector for detecting existence or nonexistence of the fuel, and a combustion control unit which controls the fuel supplier and makes the burner carry out combustion, wherein the combustion appliance carries out an ignition action again in the case where combustion is discontinued during combustion operation due to lack of gas (refer to Japanese patent laid-open No. H09-280558).
- This combustion appliance is a combustion appliance which temporarily stops the combustion with a signal from the fuel detector indicating nonexistence of fuel, and starts counting of a predetermined period of time by a timer. When a signal from the fuel detector indicating existence of fuel is received within a predetermined period of time, the combustion appliance automatically restarts combustion. After lapse of the predetermined period of time, the combustion appliance does not restart combustion even when the signal from the fuel detector indicating existence of fuel is received.
- In the conventional combustion appliance, combustion is not restarted after lapse of the predetermined period of time even when the signal from the fuel detector indicating existence of fuel is received, so that there is a problem that room temperature drops and household articles freezes when a house in frigid climate is emptied for a long period of time.
- In view of such circumstances, an object of the present invention is to provide a warm air furnace capable of preventing household articles from freezing in the case where combustion is discontinued during combustion operation due to lack of gas when a house is emptied.
- In order to achieve the above object, the present invention provides a warm air furnace comprising an air intake which takes in air; a combustor which is supplied with air taken in by the air intake and the fuel gas, and which combusts the same; an exhauster which exhausts a combustion gas combusted at the combustor to outdoors; a heat exchanger which is provided at the exhauster and which is for conducting heat of the combustion gas to indoor air; an air blower which blows the indoor air so as to receive heat from the heat exchanger; a combustion operation controller which controls operation of the combustor; and a retry operation controller which carries out the ignition action of the combustor in the case where a predetermined period of time lapsed from the time it is determined that the combustion at the combustor is discontinued during combustion operation by the combustion operation controller, determines whether or not the combustion at the combustor is started, and repeats the ignition action of igniting the combustor, in the case where it is determined that the predetermined period of time lapsed from the time it is determined that the combustion at the combustor is not started, until it is determined that the combustion at the combustor is started.
- According to the present invention, the warm air furnace includes the retry operation controller which repeats the action of igniting the combustor until it is determined that the combustion is started at the combustor in the case where the predetermined time lapsed from the time it is determined that the combustion is discontinued at the combustor during combustion operation by the combustion operating controller, so that in the case where the combustion is discontinued due to lack of gas during combustion operation in an emptied house in frigid climate, the combustion operation is restarted when the fuel is supplied. By doing so, it becomes possible to prevent the household articles from freezing.
- In the warm air furnace of the present invention, the retry operation controller carries out the ignition action of igniting the combustor in the case where a difference between a target room temperature set by a room temperature setting switch and a detected room temperature detected by a room temperature sensor becomes equal to or more than a predetermined temperature, and the predetermined time lapses.
- According to the present invention, it becomes possible to ignite the combustor in order to prevent the household articles from freezing, in the case where the predetermined period of time lapsed after the detected temperature drops greatly (exceeding the predetermined temperature difference) below the target room temperature.
- In the warm air furnace of the present invention, the air intake is comprised of an air intake tube which takes in outdoor air. According to the present invention, it is possible to apply the same to a forced flue type warm air furnace which takes in outdoor air.
- Or, in the warm air furnace of the present invention, the air intake is comprised of an air intake tube which takes in indoor air. According to the present invention, it is possible to apply the same to a closed flue type warm air furnace which takes in indoor air.
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FIG. 1 is a system configuration view of an example of a warm air furnace according to the present invention; -
FIG. 2 is a control block diagram of the warm air furnace shown inFIG. 1 ; and -
FIG. 3 is a flow chart showing a retry operation control process inFIG. 2 . - With reference to
FIG. 1 , a warm air furnace is for example a forced flue type gas warm air furnace. A main body case 1 of the warm air furnace arranged inside a room is equipped at the interior thereof with an air blow flue 2, anair blow fan 3 which is an air blower for convecting indoor air via the air blow flue 2, and a combustion devicemain body 4 for heating the indoor air flowing through the air blow flue 2. - The combustion device
main body 4 is equipped with aburner 5 which is a combustor, acombustion chamber 6 accommodating theburner 5, and aheat exchanger 7 which is a thermal exchanger continuing to thecombustion chamber 6. - The
combustion chamber 6 is connected with anair intake tube 8 for combustion air, and is also connected with anexhaust tube 9 which is an exhauster of combustion exhaust via theheat exchanger 7. Theair intake tube 8 and theexhaust tube 9 are extended to the outside of the main body case 1, and are lead out outdoors. - The
air intake tube 8 is provided with acombustion fan 10 for supplying combustion air to theburner 5 inside thecombustion chamber 6. Thecombustion fan 10 is configured from arotary vane 11 provided inside theair intake tube 8 so as to be able to rotate freely, and acombustion fan motor 12 for rotary driving therotary vane 11. Theair intake tube 8 and thecombustion fan 10 constitute the air intake of the present invention. - The
burner 5 inside thecombustion chamber 6 is connected to agas supply pipe 13 introduced from outside of the main body case 1, and the fuel gas supplied from thegas supply pipe 13 is mixed with the combustion air introduced into thecombustion chamber 6 from theair intake tube 8, so as to combust the air-fuel mixture. - In the
combustion chamber 6, anignition electrode 14 for igniting theburner 5 and aflame detector 15 such as a flame rod or a thermocouple for detecting flame of theburner 5 are provided facing theburner 5. - The
gas supply pipe 13 is disposed with two on-offsolenoid valves proportional valve 18. - The air blow flue 2 includes an
air inlet 19 and anair outlet 20 at the rear surface and the front surface of the main body case 1, respectively, and is formed through theheat exchanger 7 in between theair inlet 19 and theair outlet 20. Theair inlet 19 is mounted with anair filter 21, and theair outlet 20 is fixed with alouver 22 for adjusting the direction of blowout of the warm air. - The
air blow fan 3 is configured from arotary vane 24 provided inside the air blow flue 2 facing theair inlet 19 of the air blow flue 2, and an airblow fan motor 25 for rotary driving therotary vane 24. Theair blow fan 3 takes in indoor air into the air blow flue 2 by the rotation of therotary vane 24 via theair inlet 19. Then, theair blow fan 3 flow the air taken into the air blow flue 2 towards theair outlet 20 within the air blow flue 2 via theheat exchanger 7, and blows out the air into the room from theair outlet 20. - The air blow flue 2 is provided with a
room temperature sensor 26 which detects the temperature of the indoor air taken in by theair blow fan 3 as the room temperature at a position facing theair inlet 19. - As shown in
FIG. 1 andFIG. 2 , the gas warm air furnace of the present embodiment is equipped with acontroller 27 which carries out operation control via thesolenoid valves proportional valve 18, thecombustion fan motor 12, the airblow fan motor 25, and theignition electrode 14, anoperation switch 28 for the user to instruct on/off of operation, a retryoperation setting switch 29 for setting execution of a retry operation to be explained later, and a manipulatingdevice 31 including a roomtemperature setting switch 30 for setting a target room temperature for combustion operation and the like. - As shown in
FIG. 2 , thecontroller 27 is equipped with, as means for realizing the functions according to the present invention, a combustion operation controller 32 (this includes a retry operation controller 33 described later), and atemperature adjustment controller 34. - The
combustion operation controller 32 carries out control of the combustion operation, when operation start is instructed by theoperation switch 28, on the basis of a combustion amount determined at thetemperature adjustment controller 34. - As such, the
temperature adjustment controller 34 is equipped with a combustionamount determining unit 35. The combustionamount determining unit 35 determines the combustion amount (heating amount) of theburner 5 on the basis of the difference between the target room temperature and the detected temperature detected by theroom temperature sensor 26, while taking the temperature set by the roomtemperature setting switch 30 as the target room temperature. - That is, the combustion
amount determining unit 35 momentarily obtains the necessary combustion amount of theburner 5, on the basis of the difference between the detected temperature by theroom temperature sensor 26 and the set room temperature for combustion operation (target room temperature during combustion operation) by the roomtemperature setting switch 30. - The
combustion operation controller 32 controls the supply amount of the fuel gas and the combustion air to theburner 5 via the gasproportional valve 18 and thecombustion fan motor 12, respectively, so as to make theburner 5 combust at the necessary combustion amount. - At this time, the combustion
amount determining unit 35 carries out the temperature adjustment operation of the warm air furnace by controlling the airblow fan motor 25 so that an air volume of theair blow fan 3 according to the necessary combustion amount of theburner 5 is obtained. - Further, the
combustion operation controller 32 may carry out a forced high operation in which combustion operation with comparatively high heat quantity is executed forcibly, and a forced low operation in which combustion operation with comparatively low heat quantity is executed forcibly. - The retry operation controller 33 carries out control to retry the ignition action each time after lapse of a predetermined period of time until the fuel gas is supplied, in the case where the operation start is instructed by the retry
operation setting switch 29 and the combustion is discontinued during combustion operation due to lack of fuel gas. - Next, the actuation of the warm air furnace according to the present embodiment will be explained.
- First, a brief explanation will be given on the basic action during combustion operation, with reference to
FIG. 1 andFIG. 2 . A predetermined target room temperature is preliminarily set by the roomtemperature setting switch 30 before combustion operation. - When the operation start instruction is given by the user turning on the
operation switch 28, thecontroller 27 actuates thecombustion fan 10, and then makes theignition electrode 14 generate spark discharge for a predetermined period of time, as well as opens thesolenoid valves proportional valve 18 of thegas supply pipe 13 to start supply of a predetermined amount of fuel gas to theburner 5. Thereby, ignition process of theburner 5 is carried out. Thereafter, ignition of theburner 5 is confirmed by theflame detector 15. - After performing ignition of the
burner 5 as is explained above, thecontroller 27 controls the airblow fan motor 25 so as to actuate theair blow fan 3. Accordingly, indoor air is taken in to the air blow flue 2 via theair inlet 21. - The air taken in is heated via the
heat exchanger 7, which is heated by the combustion heat of theburner 5, during flowing through the air blow flue 2 towards theair outlet 20, and is blown out from theair outlet 20 as a warm air. - When the combustion at the
burner 5 and the actuation of theair blow fan 3 are started, thetemperature adjustment controller 34 determines the combustion amount of theburner 5 according to the difference between the detected temperature of theroom temperature sensor 26 and the target room temperature as described above, and thecombustion operation controller 32 controls the combustion action of theburner 5 and the air volume of theair blow fan 3. By doing so, the temperature adjustment control is carried out. - In the temperature adjustment control, basically, the combustion amount of the
burner 5 is decreased, and the air volume of the warm air is decreased by lowering the rotation speed of theair blow fan 3, as the detected room temperature by theroom temperature sensor 26 approaches the target room temperature. - If the detected temperature by the
room temperature sensor 26 becomes lower than the target room temperature, from the change in the target room temperature and the like, the combustion amount of theburner 5 is increased, and the air volume of the warm air is increased by raising the rotation speed of theair blow fan 3. - If the
operation switch 28 is turned off during such combustion operation, the combustion operation is stopped, thesolenoid valves proportional valve 18 of thegas supply pipe 13 are closed to stop the supply of the fuel gas to theburner 5, the fire at theburner 5 is extinguished, and thecombustion fan 10 and theair blow fan 3 are stopped. - The action explained above is the basic action during the combustion operation of the warm air furnace according to the present embodiment. Further, in the warm air furnace of the present embodiment, the
controller 27 executes the retry operation control process to be explained hereinafter by thecombustion operation controller 32 including the retry operation controller 33. - As is shown in
FIG. 3 , first, thecontroller 27 carries out the temperature adjustment operation with thecombustion operation controller 32 and the temperature adjustment controller 34 (STEP 1). Thereafter, whether or not the combustion at theburner 5 is discontinued during the temperature adjustment operation is determined on the basis of the output of theflame detector 15 which detects the flame of the burner 5 (STEP 2). - Then, in the case where the determination result in STEP 2 is NO (in the case where the combustion at the
burner 5 is not discontinued during temperature adjustment operation), thecombustion operation controller 32 continues the temperature adjustment operation. On the other hand, in the case where the determination result in STEP 2 is YES (in the case where the combustion at theburner 5 is discontinued during temperature adjustment operation), thecombustion operation controller 32 stops the temperature adjustment operation (STEP 3). That is, thecombustion operation controller 32 closes thesolenoid valves proportional valve 18 of thegas supply pipe 13 to stop the supply of the fuel gas to theburner 5, extinguishes the fire at theburner 5, and stops thecombustion fan 10 and theair blow fan 3. - Then, it is determined whether or not the difference between the target room temperature set by the room
temperature setting switch 30 and the detected room temperature detected by theroom temperature sensor 26 is equal to or more than a predetermined temperature (N° C.) (STEP 4). - In the case where the determination result in
STEP 4 is NO (in the case where the difference between the target room temperature set by the roomtemperature setting switch 30 and the detected room temperature detected by theroom temperature sensor 26 is not equal to or more than the predetermined temperature), the warm air furnace stands by until the difference between the target room temperature set by the roomtemperature setting switch 30 and the detected room temperature detected by theroom temperature sensor 26 becomes equal to or more than the predetermined temperature. - On the other hand, in the case where the determination result in
STEP 4 is YES (in the case where the difference between the target room temperature set by the roomtemperature setting switch 30 and the detected room temperature detected by theroom temperature sensor 26 is equal to or more than the predetermined temperature), the combustion operation is started as is explained hereinbelow. - That is, the
controller 27 carries out an ignition action for igniting theburner 5 with theignition electrode 14, by actuating thecombustion fan 10, making theignition electrode 14 generate spark discharge for a predetermined period of time, and starting the supply of fuel gas of a predetermined amount to theburner 5 by opening thesolenoid valves proportional valve 18 of the gas supply pipe 13 (STEP 5). Further, thecontroller 27 starts actuation of theair blow fan 3 by controlling the airblow fan motor 25. - Then, the
controller 27 determines whether or not the combustion is started at theburner 5 by the ignition action, on the basis of the output of theflame detector 15 which detects the flame of the burner 5 (STEP 6). - Thereafter, in the case where the determination result in
STEP 6 is YES (in the case where combustion is started at theburner 5 with the ignition action), thecontroller 27 carries out the forced high operation with the combustion operation controller 32 (STEP 7). On the other hand, in the case where the determination result inSTEP 6 is NO (in the case where the combustion at theburner 5 is not started by the ignition action), thecontroller 27 carries out the retry action of the ignition action. - Next, the
controller 27 determines whether or not the discontinuation of combustion occurred during the forced high operation, on the basis of the output of theflame detector 15 which detects the flame of the burner 5 (STEP 8). - Then, in the case where the determination result in
STEP 8 is NO (in the case where the combustion at theburner 5 is not discontinued during the forced high operation), thecontroller 27 returns to STEP 1 and carries out the temperature adjustment operation. In the case where the determination result inSTEP 8 is YES (in the case where the combustion at theburner 5 is discontinued during the forced high operation), thecontroller 27 carries out the ignition action of igniting theburner 5 with the ignition electrode 14 (STEP 9). - Thereafter, the
controller 27 determines whether or not the combustion at theburner 5 is started by the ignition action, on the basis of the output of theflame detector 15 which detects the flame of the burner 5 (STEP 10). - Next, in the case where the determination result in
STEP 10 is YES (in the case where the combustion at theburner 5 is started by the ignition action), thecontroller 27 continues the forced high operation. On the other hand, in the case where the determination result inSTEP 10 is NO (in the case where the combustion at theburner 5 is not started with the ignition action), thecontroller 27 carries out the retry action of the ignition action. First, thecontroller 27 determines whether or not a predetermined period of time has lapsed from the ignition action (STEP 11). - Then, in the case where the determination result in
STEP 11 is NO (in the case where the predetermined period of time had not lapsed from the ignition action), thecontroller 27 waits until the predetermined period of time lapses from the ignition action. On the other hand, in the case where the determination result inSTEP 11 is YES (in the case where the predetermined period of time lapsed from the ignition action), thecontroller 27 carries out the ignition action of igniting theburner 5 with the ignition electrode 14 (STEP 12). - Thereafter, the
controller 27 determines whether or not the combustion at theburner 5 is started by the ignition action, on the basis of the output of theflame detector 15 which detects the flame of the burner 5 (STEP 13). - Then, in the case where the determination result in
STEP 13 is NO (in the case where the combustion at theburner 5 is not started with ignition action), thecontroller 27 returns to STEP 11, and determines again whether the predetermined period of time has lapsed from the previous ignition action. On the other hand, in the case where the determination result inSTEP 13 is YES (in the case where the combustion at theburner 5 is started with ignition action), thecontroller 27 carries out the forced high operation. - Thereafter, the
controller 27 repeats the processing ofSTEP 11 throughSTEP 13, until the determination result inSTEP 13 becomes YES (until the combustion at theburner 5 is started by the ignition action). - In the processing explained above, the processing in STEP 2 and
STEP 8 corresponds to the determination on discontinuation of combustion of the present invention. Further, the processing inSTEP 5,STEP 9 andSTEP 12 corresponds to the ignition action of the present invention. Still further, the processing inSTEP 11 corresponds to the determination on lapse of predetermined period of time of the present invention. Still further, the processing inSTEP 6,STEP 10, andSTEP 13 corresponds to the determination on start of combustion of the present invention. The repeating of the processing inSTEP 11 throughSTEP 13 corresponds to the retry operation control of the present invention. - As is explained above, according to the present embodiment, the
controller 27 carries out the processing of determining whether or not the predetermined period of time had lapsed after it is determined that combustion did not start until it is determined that combustion is started. Thereafter, by carrying out the retry operation control of repeating the ignition action in the case where it is determined that the predetermined period of time had lapsed, the combustion operation is restarted when the fuel gas is supplied, so that it is possible to prevent household articles from freezing when a house in frigid climate is emptied even in the case where the combustion at theburner 5 is extinguished due to lack of fuel gas during combustion operation. - In the above-explained embodiment, explanation is given to a forced flue type warm air furnace which takes in combustion air from outdoors with a combustion fan and forcibly exhausting to the outdoors. However, the present invention is not limited thereto. The present invention may be applied to a forced exhaust type warm air furnace which takes in combustion air from indoors and forcibly exhausts to outdoors with an air blower, or a closed flue system type warm air furnace which takes in combustion air from indoors and exhaust to the outdoors by a natural aeration force with an exhaust stack. Moreover, the present invention may be applied not only to a warm air furnace using gas fuel but also to a warm air furnace using liquid fuel.
- Further, the present invention is not limited to a combustion type warm air furnace, and it is possible to obtain a similar effect by applying the retry operation control of the present invention as long as it is a warm air furnace including a heat exchanger.
Claims (4)
1. A warm air furnace which carries out an ignition action again in the case where combustion discontinues due to lack of fuel gas during combustion operation, comprising:
an air intake which takes in air;
a combustor which is supplied with air taken in by the air intake and the fuel gas, and which combusts the same;
an exhauster which exhausts a combustion gas combusted at the combustor to outdoors;
a heat exchanger which is provided at the exhauster and which is for conducting heat of the combustion gas to indoor air;
an air blower which blows the indoor air so as to receive heat from the heat exchanger;
a combustion operation controller which controls operation of the combustor; and
a retry operation controller which carries out the ignition action of the combustor in the case where a predetermined period of time lapsed from the time it is determined that the combustion at the combustor is discontinued during combustion operation by the combustion operation controller, determines whether or not the combustion at the combustor is started, and repeats the ignition action of igniting the combustor, in the case where it is determined that the predetermined period of time lapsed from the time it is determined that the combustion at the combustor is not started, until it is determined that the combustion at the combustor is started.
2. The warm air furnace according to claim 1 , wherein
the retry operation controller carries out the ignition action of igniting the combustor in the case where a difference between a target room temperature set by a room temperature setting switch and a detected room temperature detected by a room temperature sensor becomes equal to or more than a predetermined temperature, and the predetermined time lapses.
3. The warm air furnace according to claim 1 , wherein
the air intake is comprised of an air intake tube which takes in outdoor air.
4. The warm air furnace according to claim 1 , wherein
the air intake is comprised of an air intake tube which takes in indoor air.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
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US12/789,692 US20110290228A1 (en) | 2010-05-28 | 2010-05-28 | Warm air furnace |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US12/789,692 US20110290228A1 (en) | 2010-05-28 | 2010-05-28 | Warm air furnace |
Publications (1)
Publication Number | Publication Date |
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US20110290228A1 true US20110290228A1 (en) | 2011-12-01 |
Family
ID=45021034
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
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US12/789,692 Abandoned US20110290228A1 (en) | 2010-05-28 | 2010-05-28 | Warm air furnace |
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US20120037096A1 (en) * | 2010-08-16 | 2012-02-16 | Takagi Industrial Co., Ltd. | Combustion apparatus, method for combustion control, combustion control board, combustion control system and water heater |
US20120255219A1 (en) * | 2011-04-06 | 2012-10-11 | Technologies Holdings Corp. | Self-Contained Heating Unit for Thermal Pest Control |
US20130074786A1 (en) * | 2011-09-26 | 2013-03-28 | Claude Lesage | Gas water heater with increased thermal efficiency and safety |
US8720109B2 (en) | 2011-01-25 | 2014-05-13 | Technologies Holdings Corp. | Portable heating system for pest control |
US8756857B2 (en) | 2011-01-14 | 2014-06-24 | Technologies Holdings Corp. | Hydronic heating system and method for pest control |
CN105003913A (en) * | 2014-04-20 | 2015-10-28 | 黑龙江农垦科佳干燥设备制造有限公司 | Rice husk burning hot blast furnace |
US20160169558A1 (en) * | 2014-12-11 | 2016-06-16 | Rinnai Corporation | Warm air heater |
JP2016161174A (en) * | 2015-02-27 | 2016-09-05 | ダイニチ工業株式会社 | Hot air heating device |
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US9513003B2 (en) * | 2010-08-16 | 2016-12-06 | Purpose Company Limited | Combustion apparatus, method for combustion control, board, combustion control system and water heater |
US20120037096A1 (en) * | 2010-08-16 | 2012-02-16 | Takagi Industrial Co., Ltd. | Combustion apparatus, method for combustion control, combustion control board, combustion control system and water heater |
US8756857B2 (en) | 2011-01-14 | 2014-06-24 | Technologies Holdings Corp. | Hydronic heating system and method for pest control |
US9237742B2 (en) | 2011-01-25 | 2016-01-19 | Technologies Holdings Corp. | Portable heating system and method for pest control |
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CN105003913A (en) * | 2014-04-20 | 2015-10-28 | 黑龙江农垦科佳干燥设备制造有限公司 | Rice husk burning hot blast furnace |
US20160169558A1 (en) * | 2014-12-11 | 2016-06-16 | Rinnai Corporation | Warm air heater |
US10113770B2 (en) * | 2014-12-11 | 2018-10-30 | Rinnai Corporation | Warm air heater |
JP2016161174A (en) * | 2015-02-27 | 2016-09-05 | ダイニチ工業株式会社 | Hot air heating device |
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Legal Events
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AS | Assignment |
Owner name: RINNAI CORPORATION, JAPAN Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNORS:TSUNEKAWA, IKUO;ITO, KEIICHI;REEL/FRAME:024455/0794 Effective date: 20100310 |
|
STCB | Information on status: application discontinuation |
Free format text: ABANDONED -- FAILURE TO RESPOND TO AN OFFICE ACTION |