CN102802294A - High frequency heating device - Google Patents
High frequency heating device Download PDFInfo
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- CN102802294A CN102802294A CN2012101675062A CN201210167506A CN102802294A CN 102802294 A CN102802294 A CN 102802294A CN 2012101675062 A CN2012101675062 A CN 2012101675062A CN 201210167506 A CN201210167506 A CN 201210167506A CN 102802294 A CN102802294 A CN 102802294A
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Abstract
The invention provides a high frequency heating device which can work safely during the abnormal heating through detecting the temperature and the steam quantity of a heating chamber and can prevent the early power off in the normal heating. The high frequency heating device can determine the size of food (S106A to S106D), and can detect the abnormal heating of food according to the size of food (small size 1, small size 2, small size 3, and big size) and the time (S108A to S108C) spent on making the steam quantity in the heating chamber exceed a set value, reduce the level of the high frequency output of a magnetron, and decide the working time after the detection.
Description
Technical field
The present invention relates to consider the thermatron of fail safe.
Background technology
In the past, in thermatrons such as microwave oven, taked measure, guaranteed safety to using the unusual heating that causes because of user's mistake.For example; Disclosed following technology: the surface temperature of the food in heating chamber reaches setting when above in the past; According to the rise time of the atmosphere temperature in the heating chamber, infer the size of food, the situation that is divided into small loading is set other threshold value of output stage that is used to reduce the high frequency generation unit with the situation of a large amount of loads; Even when the heating of small loading, also prevented unusual heating (for example, with reference to patent documentation 1).
In addition, following technology was proposed also: in the amount of food after a little while,, then stop the high frequency generation unit, prevent the unusual heating of a small amount of food thus if the quantity of steam in the heating chamber is below the setting.
[patent documentation 1] TOHKEMY 2009-127924 communique
Thermatron for record in the patent documentation 1; Under the situation that the user heats a spot of food; When having begun heating even set heating power to such an extent that greatly also will set heating time longly by error; Rise and be judged as food temperature in the heating chamber when reaching a high temperature if detect the atmosphere temperature of heating chamber, then reduce heating power and make heating can further not carry out, therefore can prevent the unusual heating of food.
Yet, when utilizing the heating sheet that frozen food is heated, though the heating sheet reaches a high temperature after the heating beginning; But before the rising of the atmosphere temperature in detecting heating chamber, do not reduce heating power, therefore; Do not cause with freezing state end heating though can not cut off the power supply in advance; But, for a small amount of food that temperature rises easily, the problem that exists food sharply to be risen by unusual heating, temperature.
In addition; For the thermatron of running that the quantity of steam in detecting heating chamber is controlled the high frequency generation unit; Even a small amount of food that temperature rises easily; Can not stop to produce high frequency before quantity of steam in heating chamber becomes below the setting yet, can not cause outage in advance, and can prevent crossing heating and quitting work safely of food.
But, in the thermatron of patent documentation 1 record, under the bigger situation of the signal noise level of steam detecting unit; Even quantity of steam is below the setting; Also can detect signal, can't detect the minimizing of quantity of steam, can't when unusual heating, quit work.And also have following problem: even reduce from the quantity of steam of food, the steam in the heating chamber inside and outside heating chamber, is discharged and then the minimizing of entrained steam amount needs the time, and food is in unusual heated condition during this period.
Summary of the invention
The present invention accomplishes in view of above-mentioned problem in the past; Its purpose is; A kind of thermatron is provided: this thermatron can not take place to cut off the power supply in advance when common heating, even when becoming unusual heating, through temperature and the quantity of steam in the detection heating chamber; The output rank of high frequency generation unit is descended, carry out work safely.
In order to solve above-mentioned problem in the past, thermatron of the present invention has: the heating chamber of taking in food; The high frequency generation unit, its generation is used for the food in the said heating chamber is carried out the high frequency of induction heating; The surface temperature detecting unit, it is configured in the wall outside of said heating chamber, detects the temperature of the food in the said heating chamber with the noncontact mode; Temperature detecting unit in the storehouse, it detects the atmosphere temperature in the said heating chamber; Steam detecting unit in the storehouse, it detects the quantity of steam in the said heating chamber; And control part; It controls the output of said high frequency generation unit according to from the output of steam detecting unit in temperature detecting unit and the said storehouse in said surface temperature detecting unit, the said storehouse, when the user has set random time and imported heating when beginning to operate; Said control part is inferred the size of food according to the rise time of the atmosphere temperature in the said heating chamber; Reach the above institute of setting elapsed time based on the quantity of steam in the said heating chamber,, reduce the output rank of said high frequency generation unit according to the size of the infer food that; Decision quits work apart from the out-of-work time safely.
According to said structure; Even if the user is when heating a spot of food; Set heating power big by error and begun heating with also setting heating time longly, when the rising according to the rising of the atmosphere temperature in the heating chamber and quantity of steam is judged as food temperature when having reached a high temperature, the reduction heating power, quit work; Feasible heating is not further carried out, and therefore can prevent the unusual heating of food yet.In addition, the rising of the atmosphere temperature in detecting heating chamber and the rising of the quantity of steam in the heating chamber and determine before the unusual heating do not reduce heating power, therefore can when heating usually, not cause outage in advance.
According to the present invention, the thermatron that is described below can be provided: this thermatron is when carrying out manual heating to a spot of food, and the outage in advance in the time of can not producing common heating can prevent unusual heating, and safety and reliability are high.
Description of drawings
Fig. 1 is system's skeleton diagram of the thermatron of one embodiment of the present of invention.
Fig. 2 is the front view that the state of the shutter door of having closed this thermatron is shown.
Fig. 3 is the block diagram that the electrical structure of control part is shown.
Fig. 4 is the flow chart of control content that the infrared ray sensor of this control part is shown.
Fig. 5 is the flow chart of control content that the vapor sensor of this control part is shown.
Symbol description
1 heating chamber
5 infrared ray sensors (surface temperature detecting unit)
7 heating chamber thermistors (temperature detecting unit in the storehouse)
8 vapor sensors (quantity of steam detecting unit in the storehouse)
11 magnetrons (high frequency generation unit)
12 control parts
Embodiment
The 1st mode provides a kind of thermatron, and this thermatron has: the heating chamber of taking in food; The high frequency generation unit, its generation is used for the food in the said heating chamber is carried out the high frequency of induction heating; The surface temperature detecting unit, it is configured in the wall outside of said heating chamber, detects the temperature of the food in the said heating chamber with the noncontact mode; Temperature detecting unit in the storehouse, it detects the atmosphere temperature in the said heating chamber; Steam detecting unit in the storehouse, it detects the quantity of steam in the said heating chamber; And control part; It is according to the output from steam detecting unit in temperature detecting unit and the said storehouse in said surface temperature detecting unit, the said storehouse; Control the output of said high frequency generation unit, when the user has set random time and imported heating when beginning to operate, said control part is inferred the size of the food in the said heating chamber; Reach the situation of unusual heating that the above institute of setting elapsed time detects food based on the quantity of steam in the said heating chamber under; Reduce the output rank of said high frequency generation unit, and obtain the time that stops apart from said high frequency generation unit, thus; Outage in advance in the time of can not taking place to heat usually can prevent the unusual heating when a small amount of food manually cooked.
According to the 2nd mode; Particularly in the 1st mode,, infer the size of food according to the rise time of the atmosphere temperature in the said heating chamber when the user has set random time and imported heating when beginning to operate; Reach the situation of unusual heating that the above institute of setting elapsed time detects food according to the quantity of steam in the said heating chamber under; Reduce the output rank of said high frequency generation unit, and obtain the time that stops apart from said high frequency generation unit, thus; Outage in advance in the time of can not taking place to heat usually can prevent the unusual heating when a small amount of food manually cooked.
According to the 3rd mode, particularly in the 1st or the 2nd mode, in the said storehouse in temperature detecting unit and the said storehouse steam detecting unit constitute one, thus, can reduce number of components and simplified structure.
Below, with reference to accompanying drawing execution mode of the present invention is described.In addition, the invention is not restricted to this execution mode.
Fig. 1 is the skeleton diagram of the thermatron system of execution mode 1 of the present invention.
In Fig. 1; Be inserted with the sale at reduced prices platform 2 that obtains as the crystallized glass of bottom of heating chamber according to the size cutting of heating chamber in the bottom surface of heating chamber 1; On sale at reduced prices platform 2, place food 3, towards heating chamber 1, on the right flank in the heating chamber 1 on right side; Offer the hole 4 that temperature detection is used, the infrared ray sensor 5 (surface temperature detecting unit) that is configured in the wall outside is configured in the position relative with this hole 4.
Inboard bottom at heating chamber 1 disposes water storage portion 10, and the nozzle 9 that is provided with from the sidewall that protrudes in heating chamber 1 supplies water, and makes this water boiling and produces steam.In the outside of heating chamber 1, have and produce and the magnetron 11 (high frequency generation unit) of output high frequency, carry out the control part 12 that adds thermal control etc. of thermatron.
Fig. 2 is the front view of state that the door of the thermatron of stating after having closed is shown.Front at heating chamber 1 is provided with door 13 with mode to be opened/closed; And on this door 13; Be provided with the confession user and heat the cross key 14 of the selection of menu and the selection of heating time etc. and carry out the start button 15 of selecting and heating operations such as beginning, and be provided with hand push button 16 that when cancelling or operation is returned, uses and the display part 17 that carries out necessary demonstration.
Fig. 3 is the block diagram that the electrical structure of control part 12 is shown.
In Fig. 3, control part 12 is transfused to the signal from vapor sensor 8 these each structures of cross key 14, start button 15, hand push button 16 (they are referred to as operation keys), infrared ray sensor 5, the heating chamber thermistor 7 that detects the temperature in the heating chamber 1, detection quantity of steam.And control part 12 is according to these signals, according to program stored in advance, on display 17, shows power output and the information of heating time.
And, control part 12 via drive circuit 18 control magnetron 11, upper heater 6, post-heater 18, will be sent to circulating fan 19 in the heating chamber 1 from the hot blast of post-heater 18, the running of steam heater 20, cooling fan 21 that the heating and the electric component of magnetron 11 cooled off.The running of magnetron 11 is controlled via inverter 22, therefore can control output, for example, can use steam heater 20 and high frequency output 300W simultaneously.
Fig. 4 is the flow chart of control content that the infrared ray sensor 5 of control part 12 is shown, and Fig. 5 is the flow chart of control content that the vapor sensor 8 of control part 12 is shown.
In this execution mode; Set random time and imported under the situation that high-frequency heating begins to operate the user, made the anti-stop element of unusual heating realized by infrared ray sensor 5 and work concurrently by the anti-stop element of unusual heating that vapor sensor 8 is realized.Infrared ray sensor 5 is from hole 4 that the temperature detection of heating chamber 1 right flank of Fig. 1 is used and place oneself in the midst of the atmosphere of heating chamber 1.Therefore when heating; Sometimes because of from the oil of food 3 or dispersing of condiment, make the eyeglass of infrared ray sensor 5 become dirty, can not read the surface temperature of food 3 exactly; Cause food 3 to be trapped in unusual heated condition; Even but in this case, work concurrently through making the anti-stop element of the unusual heating that realizes by vapor sensor 8, also can prevent the unusual heating of food 3.
At first, use Fig. 4 that the control content of infrared ray sensor 5 is described.
When the user heats food 3,, select the power output (step S1) of high-frequency heating through click " scope output is switched " with cross key 14.The thermatron of this execution mode is selected 600W when pressing for the first time, afterwards, can select 800W, 500W, 300W, 300W steam, 150W successively through clicking.300W steam is the combination of high frequency output and steam.Suppose to have selected high frequency output 600W here.
Then, select the cooking time (step S2) with cross key 14.About the cooking time, determine maximum time respectively according to the power output of high frequency output.In the thermatron of this execution mode, be 6 minutes when 800W.And, when 600W, 500W, 300W, be 30 minutes, when 300W steam, be 15 minutes, and be 300 minutes when 150W.The maximum time of 600W, promptly 30 minutes have been supposed to select here.
Then, the user presses " beginning " key that is arranged on cross key 14 central authorities, begins heating (step S3).After the heating beginning, make the temperature of food 3 rise through high frequency output, the rank (level) that is positioned at the heating chamber thermistor 7 of heating chamber 1 rises.The rank of thermistor can be used as heating chamber 1 central authorities temperature function and be scaled temperature.Equally, below the rank of the vapor sensor of explanation can be scaled quantity of steam.
In Fig. 4, when the rank of the initial heating chamber thermistor before heating has risen the T level (step S4), establishing its rise time is A [s] (step S5).In this execution mode, the rank T=15 level of thermistor, the rise time A when heating a potato is 132 [s].In addition, the thermistor level is equivalent to about 60 ℃ for other 15 grades.In addition, be that the following situation of Tw [s] is made as (step S6A) on a small quantity with rise time A, will be made as greater than the situation of Tw [s] (step S6B) in a large number.In this execution mode, Tw=240 [s].
In step S6, be under a spot of situation at food 3, the threshold temperature (be called power and reduce temperature, in this execution mode, be set at 92 ℃) that the detected temperatures (being called the IR detected temperatures) and the small loading of infrared ray sensor 5 are used compares (step S7).In result relatively is that the IR detected temperatures is under the situation more than the threshold temperature, reduces the output as the magnetron of high frequency generation unit, makes heating relax (step S8).And be under the situation of IR detected temperatures less than threshold temperature in result relatively, judge whether reach the cooking time (step S11) that sets heating time.
And, in step S8, reduce the high frequency output of magnetron, and after the process stipulated time, detected temperatures and the 1st unusual heating-up temperature (98 ℃) to infrared ray sensor 5 compares (step S9) once more.In the IR detected temperatures is under the 1st unusual situation more than the heating-up temperature; Further pass through after the stipulated time; Compare with the 2nd unusual heating-up temperature (92 ℃), stop magnetron (S10) in the IR detected temperatures under than the high situation of the 2nd unusual heating-up temperature, under the situation of IR detected temperatures less than the 2nd unusual heating-up temperature; Output state with after reducing heats, and finishes (step S11) until the cooking time.
Then, use Fig. 5 that the control content of the vapor sensor 8 of execution mode of the present invention is described.In addition, step S1～S5 is identical with the control content of the infrared ray sensor 5 of Fig. 4.
Rise time A [s] for the situation below the Tw1 [s] is made as heating thing minimum, is defined as a small amount of 1 (step S106A).Will be than Tw1 [s] big and be made as a small amount of 2 (step S106B) smaller or equal to the situation of Tw2 [s].Will be than Tw2 [s] big and be made as a small amount of 3 (step S106C) smaller or equal to the situation of Tw3 [s].The size of food 3 does, a small amount of 1 a small amount of 2 a small amount of 3, establish the situation bigger and be a large amount of (step S106D) than Tw3 [s].Suppose a small amount of 1 for Ipomoea batatas 50g, a small amount of 2 be 1 potato, a small amount of 3 be 2 potatos, in a large number for more load.Though in this execution mode, will be divided into three ranks on a small quantity, but, the rank of any amount can be divided into.
In addition, in this execution mode, under the situation of the power output of having selected 600W, establish Tw1=110 [s], Tw2=210 [s], Tw3=270 [s].Under a large amount of situation, can not cause smoldering/on fire, not dangerous load capacity of food 3 even be assumed to the lasting heating of the maximum time of each output yet.In this execution mode, the A when using 600W that 1 potato is heated is 135 [s].
In addition; During from heating beginning (step S3); Utilization is positioned at the quantity of steam of the vapor sensor 8 supervision heating chambers 1 of portion in heating chamber 1 right side; Food 3 receives high-frequency heating and produces steam, when the rank of vapor sensor 8 is more than the setting and has kept the stipulated time, is made as and detects steam (step S107A, S107B, S107C).In this execution mode, be made as when having kept 0.6 [ms] more than 175 grades " vapor sensor detects steam ".In addition, establish from the time that heating begins to be detected by vapor sensor steam be B [s] (step S108A, S108B, S108C).In this execution mode, the B when using 600W that 1 potato is heated is 133 [s].
And,, and then transfer to next step with state continuance heating (B+a) [s] (step S109A, S109B, S109C) of initial setting output.In this execution mode, establish a=120 [s].Thus, when 1 potato being heated, continue to carry out the heating of 133+120=253 [s] with 600W.
Then, the rank of judging the heating chamber thermistor Tc level (step S110A, S110B, S110C) that whether risen during from heating beginning (step S3).This step is to be presented in the program in order to prevent cutting off the power supply in advance of food 3.Though the power of in next step, exporting reduces, need avoid not reducing output under the state of rising as yet in the temperature of food 3, therefore,, then do not transfer to next step if be not in the state that the temperature of food 3 fully rises.
But, when exceedingly improving the setting rank of heating chamber thermistor 7, under the high situation of the temperature of the heating chamber 1 in when beginning;, food 3 rises though thereby being heated the temperature of food 3; But because the rank of heating chamber thermistor rises lessly from the initial stage of heating chamber 1, therefore, although the temperature of food 3 rises fully; Still can proceed heating, therefore may be trapped in dangerous state.Here, in this execution mode, establish the rank Tc=17 level of thermistor.
Then, power output is reduced to c1 [W] (step S111A, S111B, S111C) from initial output.In this execution mode, 600 [W] are reduced to 300 [W] from initial setting output.Be respectively (B+a) * b1 [s], (B+a) * b2 [s], (B+a) * b3 [s] heating time of carrying out under powered state.This b1, b2, b3 are constants, for a small amount of 1,2, have nothing in common with each other for 3.In this execution mode, it is a small amount of 2 that situation about 1 potato being heated with 600W is classified as, b2=2, and the power of therefore keeping (133+120) * 2=506 [s] reduces output.
Then, transfer to the intermittent running (step S112A, S112B, S112C) of c2 [W].In this execution mode, be made as the intermittent running of 300 [W], 5 [s] connection/10 [s] shutoff.If be respectively (B+a) * d1 [s], (B+a) * d2 [s], (B+a) * d3 [s] heating time.This d1, d2, d3 are constants, for a small amount of 1, a small amount of 2, have nothing in common with each other for a small amount of 3.In this execution mode, it is a small amount of 2 that situation about 1 potato being heated with 600W is classified as, and therefore constant d2=1 keeps the intermittent running of (133+120) * 1=253 [s].
And, when finish the heating time of step S112A, S112B, S112C, stop high frequency output (step S113).Under a large amount of situation, keep initial setting output, if the heating of setting-up time finishes, then the cooking time finishes (step S114), stops the output of magnetron 11.In this execution mode, under situation about 1 potato being heated, generally with high frequency output 600W; As long as heating 4 [min]=240 [s] can reach suitable state, but under the situation that the user will be set at 30 minutes heating time by error, with high frequency output 600W running 253 [s], with 300W running 506 [s] and with 300W intermittent running 253 [s]; Heat 1012 [s] altogether; Potato can not be in living state, and can not smolder, and has stopped high frequency output safely.
As stated; Even set heating power, heating time by error and begun under the situation of heating the user, rise and quantity of steam according to the temperature in the heating chamber 1, detect the high temperature of situation of the food 3 more common than heating; Thereby reduce the rank of high frequency output; And obtain the time that stops apart from high frequency, can prevent the unusual heating of food 3 thus, can use safely.
As stated; According to thermatron of the present invention; Even if the user has set bigger heating power to a spot of food and has set long heating time; Outage in advance in the time of also can not occurring heating usually can prevent unusual heating, and the safe high thermatron of reliability can be provided.
Claims (3)
1. a thermatron is characterized in that, this thermatron has:
Take in the heating chamber of food;
The high frequency generation unit, its generation is used for the food in the said heating chamber is carried out the high frequency of induction heating;
The surface temperature detecting unit, it is configured in the wall outside of said heating chamber, detects the temperature of the food in the said heating chamber with the noncontact mode;
Temperature detecting unit in the storehouse, it detects the atmosphere temperature in the said heating chamber;
Steam detecting unit in the storehouse, it detects the quantity of steam in the said heating chamber; And
Control part, it controls the output of said high frequency generation unit according to the output from steam detecting unit in temperature detecting unit and the said storehouse in said surface temperature detecting unit, the said storehouse,
When the user has set random time and imported heating when beginning to operate; Said control part detects reaching setting above institute elapsed time based on the quantity of steam in the said heating chamber under the situation of unusual heating of food; Reduce the output rank of said high frequency generation unit, and obtain the time that stops apart from said high frequency generation unit.
2. thermatron according to claim 1, wherein,
When the user has set random time and imported heating when beginning to operate; Said control part is inferred the size of food according to the rise time of the atmosphere temperature in the said heating chamber; Detect reaching setting above institute elapsed time under the situation of unusual heating of food based on the quantity of steam in the said heating chamber; Reduce the output rank of said high frequency generation unit, and obtain the time that stops apart from said high frequency generation unit.
3. thermatron according to claim 1 and 2, wherein,
In the said storehouse in temperature detecting unit and the said storehouse steam detecting unit be one.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2011119056A JP2012247129A (en) | 2011-05-27 | 2011-05-27 | High-frequency heater |
| JP2011-119056 | 2011-05-27 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN102802294A true CN102802294A (en) | 2012-11-28 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2012101675062A Pending CN102802294A (en) | 2011-05-27 | 2012-05-25 | High frequency heating device |
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| CN (1) | CN102802294A (en) |
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| JP2012247129A (en) | 2012-12-13 |
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