US20100223947A1 - Electric Compressor and Air Conditioning System for vehicle, Using the Electric Compressor - Google Patents
Electric Compressor and Air Conditioning System for vehicle, Using the Electric Compressor Download PDFInfo
- Publication number
- US20100223947A1 US20100223947A1 US12/223,129 US22312907A US2010223947A1 US 20100223947 A1 US20100223947 A1 US 20100223947A1 US 22312907 A US22312907 A US 22312907A US 2010223947 A1 US2010223947 A1 US 2010223947A1
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- United States
- Prior art keywords
- electric
- circuit board
- electric compressor
- air conditioning
- conditioning system
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- 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
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Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
- F04C29/00—Component parts, details or accessories of pumps or pumping installations, not provided for in groups F04C18/00 - F04C28/00
- F04C29/04—Heating; Cooling; Heat insulation
- F04C29/047—Cooling of electronic devices installed inside the pump housing, e.g. inverters
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60H—ARRANGEMENTS OF HEATING, COOLING, VENTILATING OR OTHER AIR-TREATING DEVICES SPECIALLY ADAPTED FOR PASSENGER OR GOODS SPACES OF VEHICLES
- B60H1/00—Heating, cooling or ventilating [HVAC] devices
- B60H1/32—Cooling devices
- B60H1/3204—Cooling devices using compression
- B60H1/3223—Cooling devices using compression characterised by the arrangement or type of the compressor
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
- F04C18/00—Rotary-piston pumps specially adapted for elastic fluids
- F04C18/02—Rotary-piston pumps specially adapted for elastic fluids of arcuate-engagement type, i.e. with circular translatory movement of co-operating members, each member having the same number of teeth or tooth-equivalents
- F04C18/0207—Rotary-piston pumps specially adapted for elastic fluids of arcuate-engagement type, i.e. with circular translatory movement of co-operating members, each member having the same number of teeth or tooth-equivalents both members having co-operating elements in spiral form
- F04C18/0215—Rotary-piston pumps specially adapted for elastic fluids of arcuate-engagement type, i.e. with circular translatory movement of co-operating members, each member having the same number of teeth or tooth-equivalents both members having co-operating elements in spiral form where only one member is moving
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
- F04C23/00—Combinations of two or more pumps, each being of rotary-piston or oscillating-piston type, specially adapted for elastic fluids; Pumping installations specially adapted for elastic fluids; Multi-stage pumps specially adapted for elastic fluids
- F04C23/008—Hermetic pumps
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60H—ARRANGEMENTS OF HEATING, COOLING, VENTILATING OR OTHER AIR-TREATING DEVICES SPECIALLY ADAPTED FOR PASSENGER OR GOODS SPACES OF VEHICLES
- B60H1/00—Heating, cooling or ventilating [HVAC] devices
- B60H1/00507—Details, e.g. mounting arrangements, desaeration devices
- B60H2001/00614—Cooling of electronic units in air stream
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
- F04C2240/00—Components
- F04C2240/80—Other components
- F04C2240/808—Electronic circuits (e.g. inverters) installed inside the machine
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Compressor (AREA)
- Control Of Positive-Displacement Pumps (AREA)
- Applications Or Details Of Rotary Compressors (AREA)
- Air-Conditioning For Vehicles (AREA)
Abstract
An electric compressor (20) comprises an electric motor (70) enclosed in a motor casing (33), a division wall (60) dividing the interior of the motor casing (33) and having an inner side surface in contact with a working fluid before compressed, a leg (120) integrally formed on an outer side surface of the division wall (60), and a control board (111) with a microcomputer (112) for driving the electric motor (70) mounted, the control board being fixed to the leg (120).
Description
- This invention relates to an electric compressor and an automotive air conditioning system, and particularly an electric compressor suited for an automotive air conditioning system.
- Electric compressors have a compression unit and an electric motor enclosed in a housing. Some electric compressors have also an inverter circuit for driving the electric motor and a control circuit for controlling the inverter circuit, within the housing.
- These circuits, particularly the inverter circuit tends to become high in temperature while supplying electric power to the electric motor. Thus, the circuit board of the inverter circuit is arranged in a low-temperature region within the housing. For example, the electric compressor disclosed in Japanese Unexamined Patent Publication No. 2003-139069 has a circuit board of an inverter circuit fixed in close contact with a division wall of the housing, where the division wall is cooled by a working fluid before compressed by the compression unit.
- In addition, the electric compressor disclosed in the above publication has a temperature sensor attached to the circuit board. When the temperature detected rises above an upper limit, the rotation speed of the motor is increased to increase the flow rate of the working fluid, thereby cooling the circuit sufficiently. Thus, in this electric compressor, the electric components constituting the circuit are expected to be prevented from overheating, which results in an increase in durability of the circuit, and therefore of the compressor.
- The primary object of this invention is to provide an electric compressor which is further increased in reliability of preventing the overheating of the electric components and therefore has a further increased durability, and an automotive air conditioning system using the electric compressor.
- In order to achieve the above object, an electric compressor according to the present invention comprises an electric motor for driving a compression unit for compressing a working fluid, enclosed in a housing together with the compression unit; a division wall dividing the interior of the housing and having an inner side surface in contact with a working fluid before compressed by the compression unit; a leg integrally formed on an outer side surface of the division wall; and a first circuit board on which electric components for driving the electric motor are mounted, the first circuit board being fixed to the leg.
- In the electric compressor according to the present invention, the circuit board is fixed to the leg integrally formed on the division wall. Since heat is efficiently transferred between the circuit board and the division wall via the leg, the circuit board has an increased heat radiation performance. Consequently, the electric components mounted on the circuit board are reliably prevented from overheating and therefore have an increased durability, which leads to an increased durability of the compressor.
- Desirably, at least one of the electric components mounted on the circuit board is in contact with said outer side surface. Desirably, the electric compressor further comprises a second circuit board on which electric components for driving the electric motor in cooperation with the electric components on the first circuit board are mounted, where at least one of the electric components on the second circuit board is in contact with said outer side surface. In these desirable configurations of the electric compressor, the electric component in direct contact with the outer side surface of the division wall has an increased heat radiation performance. This prevents the overheating of this electric component and therefore increases the durability of this electric component, which leads to an increased durability of the compressor.
- Desirably, a distal end of the leg is in contact with a metal part of the circuit board. In this desirable configuration of the electric compressor, the contact between the distal end of the leg and the metal part of the control board allows efficient heat transfer between the leg and the circuit board, so that the circuit board has a further increased heat radiation performance. This increases the reliability of preventing the overheating of the electric components mounted on the circuit board.
- Desirably, the metal part is a ground terminal of the circuit board. In this desirable configuration of the electric compressor, the contact between the distal end of the leg and the ground terminal allows heat produced in the circuit board to be efficiently transferred to the leg via ground wiring provided to extend across the entire circuit board. Further, since the electric components mounted on the circuit board are connected with the ground wiring, heat produced in the electric components is also efficiently transferred to the leg via the ground wiring. This further increases the reliability of preventing the overheating of the electric components mounted on the circuit board.
- Desirably, the electric compressor further comprises a temperature sensor fixed to one or each of the first and second circuit boards and a control means for driving the electric motor basing on a result of detection by the temperature sensor. In this desirable configuration of the electric compressor, the temperature of an electric component is detected by the temperature sensor, and the control means drives the electric motor basing on a result of detection by the temperature sensor. The electric motor drives the compression unit, so that a low-pressure working fluid is drawn to the compression unit across the housing. In this process, the division wall is cooled by the flowing working fluid, so that the electric components are prevented from overheating.
- Desirably, it is arranged such that when, in a waiting state of the electric compressor, temperature detected by the temperature sensor rises above an activation temperature, the control means temporarily drives the electric motor. In this desirable configuration of the electric compressor, when in a waiting state of the electric compressor, temperature detected by the temperature sensor rises above an activation temperature, the electric motor is temporarily driven. The electric motor drives the compression unit, so that a low-pressure working fluid is drawn to the compression unit across the housing. Thus, also in the waiting state of the electric motor, the division wall is cooled by the flowing working fluid, so that the electric components are prevented from overheating.
- Here, the waiting state means a state in which an electric compressor, incorporated in a system to allow the system to perform a specific function, does not need to operate since the system is not performing that function. For example, for an electric compressor used in an automotive air conditioning system, the waiting state is a state in which cooling or dehumidifying the vehicle interior is not required.
- Desirably, it is arranged such that when, in the waiting state of the electric compressor, the temperature detected by the temperature sensor drops to or below a stop temperature, the control means stops the temporarily-driven electric motor. In this desirable configuration of the electric compressor, when in the waiting state of the electric compressor, the temperature detected by the temperature sensor drops to or below a stop temperature, the temporarily-driven electric motor is stopped. This allows the compressor to prevent the overheating of the electric components, keeping energy consumption at a low level.
- In order to achieve the above-mentioned object, an automotive air conditioning system according to the present invention has an electric compressor in any of the above-described configurations, disposed in an engine room.
- In the automotive air conditioning system according to the present invention, the electric compressor has an increased durability, which results in an increase in durability of the whole system.
- Let us consider the case in which the automotive air conditioning system is arranged such that when, in the waiting state of the electric compressor, the temperature detected by the temperature sensor rises above the activation temperature, the control means of the electric compressor temporarily drives the electric motor. In this particular configuration, for example, even if the automotive air conditioning system is not performing a cooling or a dehumidification function while the engine is operating, when the engine room becomes hot so that the temperature detected by the temperature sensor exceeds the activation temperature, the electric motor is driven. Thus, the automotive air conditioning system arranged this way is increased in reliability of preventing the overheating of the electric components of the electric compressor, which leads to a further increase in durability of the whole system.
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FIG. 1 is a diagram showing a schematic configuration of an embodiment of an automotive air conditioning system; -
FIG. 2 is a diagram showing a vertical cross section of an electric compressor applied to the system shown inFIG. 1 ; -
FIG. 3 is a diagram showing a part near the distal end of a leg in the cross section shown inFIG. 2 , on an enlarged scale; -
FIG. 4 is a diagram schematically showing wire connections between an electric compressor, a battery and an air conditioning control device of the system shown inFIG. 1 ; -
FIG. 5 is a flow chart schematically showing a protective operation program, which is executed by a control circuit shown inFIG. 4 ; -
FIG. 6 is a diagram showing a part near a circuit chamber of a variant of the compressor; and -
FIG. 7 is a flow chart schematically showing a variant of the protective operation program, which is executed by the air conditioning control device shown inFIG. 4 as an interruption routine. -
FIG. 1 shows a schematic configuration of an embodiment of an automotive air conditioning system. - The system includes a
refrigeration circuit 10, and arefrigerant circulation passage 11 of therefrigeration circuit 10 extends from avehicle engine room 12 into avehicle interior 14 through apartition wall 13. Within theengine room 12, anelectric compressor 20, acondenser 21, areceiver 22 and anexpansion valve 23 are disposed in therefrigerant circulation passage 11 in this order as viewed in the direction of the refrigerant circulation. Theelectric compressor 20 is arranged near theengine 24, and thecondenser 21 is arranged near a vehicle radiator grill, together with a fan (not shown). - Within the
vehicle interior 14, anevaporator 25 is disposed in therefrigerant circulation passage 11. Theevaporator 25 is located downstream of theexpansion valve 23. A front part of thevehicle interior 14 is defined as aninstrument room 27 by aninstrument panel 26, and theevaporator 25, enclosed in an air-conditioning unit housing 28 together with a blower (not shown), is arranged within theinstrument room 27. -
FIG. 2 shows an electric scroll compressor used as thecompressor 20. Thecompressor 20 has an approximatelycylindrical housing 30, and thehousing 30 has aunit casing 31, asupport wall 32 and amotor casing 33 which are made of metal and arranged in this order, from the right to the left inFIG. 2 . - The
unit casing 31 is in the shape of a cup, and ascroll unit 40 is enclosed in theunit casing 31. Thescroll unit 40 has a fixedscroll 41 and amovable scroll 42, and the fixedscroll 41 is fixed to an end wall of theunit casing 31 by a plurality of fixingbolts 43. - The interior of the
unit casing 31 is axially divided in two by a base plate of the fixedscroll 41, and adischarge chamber 44 is defined between the base plate of the fixedscroll 41 and the end wall of theunit casing 31. Adischarge port 45 communicating with thedischarge chamber 44 is formed in the cylindrical wall of theunit casing 31, at a position near the end wall of theunit casing 31. Thedischarge port 45 is connected to thecondenser 21 by a segment ofrefrigerant circulation passage 11. - The
movable scroll 42 is arranged to themotor casing 33 side, and the fixed andmovable scrolls compression chambers 46 are formed between their spiral walls. As themovable scroll 42 moves circularly relative to the fixedscroll 41, thechambers 46 shift toward the center of the fixed andmovable scrolls compression chamber 46 that has arrived at the center communicates with thedischarge chamber 44 via adischarge hole 47 formed approximately at the center of the base plate of the fixedscroll 41. Thedischarge hole 47 is opened and closed by a discharge valve (not shown). The discharge valve is a reed valve attached to the end face of the fixedscroll 41 which faces thedischarge chamber 44.Reference sign 48 indicates a valve holddown member which regulates the opening of the reed valve. - Within the
unit casing 31, there is defined anintake chamber 49 surrounding themovable scroll 42. Thecompression chamber 46 that is at the radially outermost position communicates with theintake chamber 49. - A
support wall 32 is fitted to the open end of theunit casing 31. Thesupport wall 32 has a shaft hole in the center, and acommunication hole 34 outside the shaft hole. Arotary shaft 50 is passed through the shaft hole, and aball bearing 51 is fitted between the shaft hole and therotary shaft 50. Therotary shaft 50 has a large-diameter end portion 52 positioned within theunit housing 31. On a crankpin 53 projecting from the large-diameter end portion 52, aneccentric bush 54 is fitted. Theeccentric bush 54 is enclosed in aboss 55 formed on the rear side of themovable scroll 42, and aneedle bearing 56 is fitted between theeccentric bush 54 and theboss 55. By thesecrank pin 53,eccentric bush 54 andneedle bearing 56, rotation of therotary shaft 50 is translated into circular motion of themovable scroll 42. - Between the base plate of the
movable scroll 42 and thesupport wall 32, aball coupling 57 is provided. Theball coupling 57 not only prevents themovable scroll 42 from rotating on its axis while moving circularly relative to the fixedscroll 41, but also functions as a thrust bearing to receive reaction force against compression from themovable scroll 42. - A
motor casing 33 is in the shape of a cylinder open at either end. Themotor casing 33 and theunit casing 31 are connected by a plurality of connectingbolts 58, with thesupport wall 32 interposed between their open ends. - The interior of the
motor casing 31 is axially divided in two by adivision wall 60. Astator chamber 61 is defined between thedivision wall 60 and thesupport wall 32. Anintake port 62 communicating with thestator chamber 61 is formed in the cylindrical wall of themotor casing 33, at a position near thedivision wall 60. Theintake port 62 is connected to theevaporator 25 by a segment ofrefrigerant circulation passage 11. - The above-mentioned
rotary shaft 50 extends across thestator chamber 61, and the end of therotary shaft 50 opposite the large-diameter end is located near thedivision wall 60. A cylindrical bearing support projects from the center of thedivision wall 60, and aball bearing 63 is fitted between the inner surface of the bearing support and therotary shaft 50. Thus, therotary shaft 50 is rotatably supported by theball bearings - The
rotary shaft 50 constitutes a part of arotor 71 of, for example a brushless three-phase induction motor 70. Alaminated member 72 constituted by annular magnetic steel sheets, serving as an approximately cylindrical iron core, is fitted on therotary shaft 50. Thelaminated member 72 is held betweenend plates 73 in a pair at the opposite ends. Theend plates 73 are connected by a plurality ofrivets 74. - The
laminated member 72 of therotor 71 is surrounded by astator 80, and thestator 80 includes an approximatelycylindrical core 81. Thecore 81 is fitted into the inner cylindrical surface of themotor casing 33 and fixed to thedivision wall 60 by fixingbolts 82. A plurality of slots are formed in the inner cylindrical surface of the core 81, circumferentially apart from each other, so that stator teeth are provided between the adjacent slots. Wire is wound around each stator tooth to form coils 83. By supplying a current to thecoils 83, each stator tooth is magnetized. - The
laminated member 72 of therotor 71 and thestator 70 are located approximately in the middle in the axial direction of thestator chamber 61, and thedivision wall 60 side and thesupport wall 32 side of thestator chamber 61 communicate with each other, for example through a gap (not shown) provided between thelaminated member 72 and thestator 80. Thus, theintake port 62 communicates with theintake chamber 49 via thestator chamber 61. - From the
coils 83 of thestator 80, three input lines (not shown) extend, and the ends of the three input lines are connected to ends of threepins 90 extending through thedivision wall 60 in an air-tight and insulated manner, respectively. Only one of the threepins 90 is shown inFIG. 1 . - The other ends of the three
pins 90 located within acircuit chamber 91 function as an input of theelectric motor 70, namely, U-, V- and W-terminals. Thecircuit chamber 91 is defined between thedivision wall 60 and anend plate 92 fixed at the end of themotor casing 33 opposite the support wall. - An output of an
inverter circuit 100 disposed in thecircuit chamber 91 is electrically connected to the above-mentioned ends of thepin 90, namely, the U-, V-, and W-terminals. Theinverter circuit 100 is a three-phase bridge circuit, and includes a printed circuit board 101 (hereinafter referred to as an “inverter board”) and anIGBT module 102 mounted on theinverter board 101. - The
inverter board 101 is arranged near and parallel to thedivision wall 60 and screwed to thedivision wall 60. TheIGBT module 102 is located between theinverter board 101 and thedivision wall 60, and the upper surface of theIGBT module 102 is in direct plane contact with thedivision wall 60. When viewed in the circumferential direction of themotor casing 33, theIGBT module 102 is in contact with thedivision wall 60 at the position approximately corresponding to theintake port 62. - An input of the
inverter circuit 100 is electrically connected to a battery 109 (DC power source) disposed in theengine room 12, via an input/output plug 108 attached to the cylindrical wall of themotor casing 33. The input of theinverter circuit 100 is also electrically connected to an output of acontrol circuit 110, which is also disposed in thecircuit chamber 91. - The
control circuit 110 is provided to perform VVVF control (variable-voltage variable-frequency control) on theinverter circuit 100, and includes a printed circuit board 111 (hereinafter referred to as a “control board”) and electric components, such as amicrocomputer 112 and acapacitor 113, mounted on thecontrol board 111. - The
control board 111 is larger than theinverter board 101, and located further from thedivision wall 60 than theinverter board 101 is. Thecontrol board 111 is supported by a plurality ofcolumnar legs 120. Eachleg 120 integrally projects from thedivision wall 60, and when viewed in the axial direction of themotor casing 33, the distal ends of all thelegs 120 are on the same imaginary plane. Since thecircuit chamber 91 side surface of thedivision wall 60 is not flat, thelegs 120 are different in length. - As shown in
FIG. 3 , bottomed threadedholes 121 open at the centers of the distal ends of thelegs 120, respectively. Thecontrol board 111 has throughholes 122 at the positions corresponding to the threaded holes 121. Each of the throughholes 122 has its open ends inmetal lands control board 111. The inner surface of the throughhole 122 is covered with ametal coating 125, and themetal coating 125 connects thelands - Each through
hole 122 extends through ametal layer 126 provided within thecontrol board 111 for grounding, and themetal coating 125 and themetal layer 126 are joined. When thecontrol board 111 is fixed to thelegs 120 by fasteningscrews 127 into the threadedholes 121 via the throughholes 122, the distal ends of thelegs 120 and the heads of thescrews 127 come in direct plane contact with the correspondinglands - Referring back to
FIG. 2 , an input of thecontrol circuit 110 is connected to an airconditioning control device 130 via the above-mentioned input/output plug 108. The airconditioning control device 130 is placed in the above-mentionedinstrument room 27. - This
electric compressor 20 further includes temperature protection circuits for theinverter circuit 100 and thecontrol circuit 110, respectively, and the temperature protection circuits include atemperature sensor 150 mounted on theinverter board 101 and atemperature sensor 151 mounted on thecontrol board 111, respectively. Thetemperature sensor 150 on theinverter board 101 is arranged near theIGBT module 102 to detect the temperature of theIGBT module 102, and thetemperature sensor 151 on thecontrol board 111 is arranged near themicrocomputer 112 to detect the temperature of themicrocomputer 112. Thetemperature sensors control circuit 110. - The
circuit chamber 91 is filled with a resin material to protect theinverter circuit 100, thecontrol circuit 110 and the temperature protection circuits against vibration, although hatching for indicating the resin material is omitted inFIG. 2 . -
FIG. 4 schematically shows wire connections between the above-describedelectric motor 70,inverter circuit 100,control circuit 110, airconditioning control device 130, temperature protection circuits andbattery 109. - As seen from
FIG. 4 , theIGBT module 102 includes six IGBTs (insulated-gate bipolar transistors) 160, which are power transistors, sixfeedback diodes 161 and a smoothingcapacitor 162. Thecontrol circuit 110 switches a gate voltage to the gate terminal of eachIGBT 160 on and off. - Next, the operation of the above-described automotive air conditioning system will be described.
- The air
conditioning control device 130 performs main control over the automotive air conditioning system. When thevehicle interior 14 needs to be cooled or dehumidified according to an instruction given by a passenger, the air conditioning control device sends a control signal to thecontrol circuit 110 of theelectric compressor 20. Receiving the control signal, thecontrol circuit 110 applies a gate voltage to theIGBTs 160 of theinverter circuit 100, thereby driving theelectric motor 70. As theelectric motor 70 operates, therotary shaft 50 rotates, which causes themovable scroll 42 to move circularly. The circular movement of themovable scroll 42 results in shift of thecompression chambers 46. - As the
compression chambers 46 shift, an intake step, namely a step of taking a refrigerant, or a working fluid from theintake chamber 49 into thecompression chambers 46, a compression step, namely a step of compressing the taken-in refrigerant in thecompression chambers 46, and a discharge step, namely a step of discharging the compressed refrigerant from thecompression chambers 46 into thedischarge chamber 44 are performed. In other words, the refrigerant in gas form in theevaporator 25 is drawn to theintake port 62 via therefrigerant circulation passage 11, and the refrigerant in high-temperature liquid form is sent from thedischarge port 45 to thecondenser 21 via therefrigerant circulation passage 11. - Here, the gaseous refrigerant in the
evaporator 25 results from almost complete vaporization of the refrigerant exiting theexpansion valve 23 in a wet state. An air current created by a blower to flow across the exterior of theevaporator 25 is cooled by the refrigerant taking heat to vaporize. The resulting cold air is heated as necessary, and then caused to flow into thevehicle interior 14, so that thevehicle interior 14 is cooled or dehumidified. - In addition to the above-described main control performed by the air
conditioning control device 130, themicrocomputer 112 of thecontrol circuit 110 constantly executes a temperature protection program shown inFIG. 5 . It is to be noted that themicrocomputer 112 executes two temperature protection programs provided for theIGBT module 102 and themicrocomputer 112, in parallel. Since these two temperature protection programs are almost the same in structure, the temperature protection program for themicrocomputer 112 will be described as an example. - According to the temperature protection program, first whether or not the
control circuit 110 is requested by the airconditioning control device 130 to activate thecompressor 20, namely whether or not thecontrol circuit 110 has received from the air conditioning control device 130 a control signal indicating that thecompressor 20 should be activated (S10). As long as the airconditioning control device 130 requests activation of thecompressor 20, step S10 of the program is repeated. If the airconditioning control device 130 does not request activation of thecompressor 20, thecontrol circuit 110 determines whether or not thecompressor 110 is in operation (S20). - If at step S20, it is determined that the
compressor 20 is at rest, whether or not the temperature Tm of themicrocomputer 112 detected by thetemperature sensor 150 is higher than a predetermined activation temperature T2 is determined (S30). The activation temperature T2 is 85° C., for example. If the temperature Tm is not higher than the activation temperature T2, the flow of control returns to step S10. If the temperature Tm is higher than the activation temperature T2, thecontrol circuit 110 applies a gate voltage to each of theIGBTs 160 at predetermined timings, thereby driving theelectric motor 70, thereby activating the compressor 20 (S40). - After the
compressor 20 is activated, thecontrol circuit 110 determines whether or not the temperature Tm is lower than a predetermined stop temperature T1 (S50). The stop temperature T1 is lower than the activation temperature T2, and 80° C., for example. If the temperature Tm is lower than the stop temperature T1, thecontrol circuit 110 ceases to apply the gate voltage to each of theIGBTs 160, thereby stopping theelectric motor 70, thereby stopping the compressor 20 (S60). If the temperature Tm is not lower than the stop temperature T1, the flow of control returns to step S10. If the airconditioning control device 130 does not request the activation of thecompressor 20 when the flow of control has returned to step S10, it means that thecompressors 20 has been activated at step S40 in a preceding cycle. Thus, the flow of control jumps to step S50 from step S20. - The schematic structure of the temperature protection program for the
microcomputer 112 is as described above. In the temperature protection program for theIGBT module 102, the temperature Tm in the temperature protection program for themicrocomputer 112 is replaced with the temperature Ti of theIGBT module 102 measured by thetemperature sensor 150. - In the above-described embodiment of the automotive air conditioning system, the
electric compressor 20 has an increased durability compared with the compressor in the conventional system, which results in an increased durability of the whole system. The reasons for the increase in durability of theelectric compressor 20 are as follows: - In the
electric compressor 20, thecontrol board 111, disposed farther from thedivision wall 60 than theinverter board 101, is fixed to the distal ends of thelegs 120 integrally formed on thedivision wall 60. Since heat is efficiently transferred between thecontrol board 111 and thedivision wall 60 via thelegs 120, thecontrol board 111 has an increased heat radiation performance. Consequently, the electric components mounted on thecontrol board 111 to constitute thecontrol circuit 110, such as themicrocomputer 112 and thecapacitor 113, are reliably prevented from overheating, which results in an increase in durability of the electric components constituting thecontrol circuit 110, and therefore of thecompressor 20. - Further, in the
electric compressor 20, theIGBT module 102 mounted on theinverter board 101 is in direct contact with thecircuit chamber 91 side surface of thedivision wall 60, so that theIGBT module 102 has an increased heat radiation performance. Thus, theIGBT module 102, or in other words, the electric components constituting theinverter circuit 100, such as theIGBTs 160, thefeedback diodes 161 and the smoothingcapacitor 162, are prevented from overheating and therefore have an increased durability, which results in an increase in durability of thecompressor 20. - Further, in the
electric compressor 20, the distal end of eachleg 120 is in contact with themetal land 123 on thecontrol board 111, which allows efficient heat transfer between thelegs 120 and thecontrol board 111, so that thecontrol board 111 has a further increased heat radiation performance. This increases the reliability of preventing the overheating of the electric components constituting thecontrol circuit 110. - Further, in the
electric compressor 20, eachland 123 is joined to themetal layer 126 provided for grounding thecontrol circuit 110 and functions as a ground terminal. The contact between the distal ends of thelegs 120 and thelands 123 allows heat produced in thecontrol board 111 to be efficiently transferred to thelegs 120 via themetal layer 126 provided to extend across theentire control board 111 in a predetermined pattern. Particularly, since themetal layer 126 is connected to the respective electric components constituting thecontrol circuit 110, heat produced in the electric components is also efficiently transferred to thelegs 120 via themetal layer 126. This further increases the reliability of preventing the overheating of the electric components constituting thecontrol circuit 110. - Further, the temperatures Ti, Tm of the
IGBT module 102 and themicrocomputer 102 are detected by thetemperature sensors electric compressor 20 is activated by themicrocomputer 112 of thecontrol circuit 110 on the basis of the detection results. Specifically, even in a waiting state in which theelectric compressor 20 is not requested to operate by the airconditioning control device 130, if at least one of the temperatures Ti, Tm detected by thetemperature sensors electric compressor 20 is temporarily activated by themicrocomputer 112 of thecontrol circuit 110. When theelectric compressor 20 is activated, theelectric motor 70 drives thescroll unit 40, i.e., the compression unit, so that a low-pressure refrigerant is drawn to the compression unit across thestator chamber 61. Thus, also in the waiting state, thedivision wall 60 is cooled by the flowing refrigerant, so that the electric components, including theIGBT module 102 and themicrocomputer 112, are prevented from overheating. - Further, if, in the waiting state, the temperatures Ti, Tm detected by the
temperature sensors electric compressor 20 is stopped by themicrocomputer 112 of thecontrol circuit 110. This allows theelectric compressor 20 to prevent the overheating of the electric components, keeping power consumption at a low level. - Specifically, in the automotive air conditioning system using this
electric compressor 20, for example when the operation of theengine 24 makes theengine room 12 hot so that the temperatures Ti, Tm detected by thetemperature sensors electric compressor 20 in the waiting state is temporarily activated. Thus, in this system, the electric components used in theelectric compressor 20 are prevented from overheating with an increased reliability, which results in a further increase in durability of the whole system. - The present invention is not limited to the above-described embodiment but can be modified in various ways. For example, although in the described embodiment, the
inverter circuit 100, thecontrol circuit 110 and the temperature protection circuits are disposed in thecircuit chamber 91, another circuit can be disposed therein. - Further, the number of circuit boards disposed therein is not limited to two, namely the
inverter board 101 and thecontrol board 111. For example, as shown inFIG. 6 , the inverter circuit, the control circuit and the protection circuits can be constructed on asingle circuit board 155. - Although in the described embodiment, the
control board 111 is fixed to the distal ends of thelegs 120, the number oflegs 120 can be reduced up to one. The shape as well as the size of the leg is not limited to a particular one. The leg can be in the shape of a circular column, an elliptic column, a rectangular column, a circular truncated cone or the like. In an example where a single circuit board is fixed to four legs in the shape of a circular column, the legs measure no less than 5 mm but no greater than 30 mm in length and no less than 10 mm but no greater than 14 mm in diameter, for example. - Although in the described embodiment, the inverter circuit is constructed using an IGBT module, the inverter circuit can use power transistors other than IGBTs as switching devices.
- Although in the described embodiment, two
temperature sensors IGBT module 102 and themicrocomputer 112, the temperature sensors can be arranged to measure the temperatures of other electric components. Further, the number of temperature sensors provided is not limited to two. - Although in the described embodiment, the
electric motor 70 of theelectric compressor 20 is a brushless induction motor, the structure of the electric motor provided is not limited to a particular one. Further, although in the described embodiment, theelectric compressor 20 is an electric scroll compressor having a compression unit constituted by ascroll unit 40, the electric compressor can be an electric reciprocating compressor having a compression unit constituted by a cylinder block and a piston. - Although in the described embodiment, the
microcomputer 112 of the control circuit executes a protective operation program, it can be arranged such that the airconditioning control device 130 provided outside thecompressor 20 executes a protective operation program, for example as an interrupt routine, in addition to programs for main control. In this case, thetemperature sensors conditioning control device 130 as indicated in broken lines inFIG. 4 . As seen fromFIG. 7 , the protective operation program executed by the airconditioning control device 130 is slightly different from the flow chart shown inFIG. 5 . Specifically, it differs in that the airconditioning control device 130 determines whether or not it is requested, in the main control, that thecontrol circuit 110 should activate the compressor 20 (S10′), requests thecontrol circuit 110 to activate the compressor 20 (S40′), and requests thecontrol circuit 110 to stop the compressor 20 (S60′). - Last, it goes without saying that the electric compressor according to the present invention is applicable to systems other than the automotive air conditioning system.
Claims (20)
1. An electric compressor, comprising:
an electric motor for driving a compression unit for compressing a working fluid, enclosed in a housing together with the compression unit,
a division wall dividing the interior of the housing and having an inner side surface in contact with a working fluid before compressed by the compression unit,
a leg integrally formed on an outer side surface of the division wall, and
a first circuit board on which electric components for driving the electric motor are mounted, the first circuit board being fixed to the leg.
2. The electric compressor according to claim 1 , wherein
at least one of said electric components mounted on the circuit board is in contact with said outer side surface.
3. The electric compressor according to claim 1 , wherein
a distal end of the leg is in contact with a metal part of the circuit board.
4. The electric compressor according to claim 3 , wherein
the metal part is a ground terminal of the circuit board.
5. The electric compressor according to claim 2 , wherein
a distal end of the leg is in contact with a metal part of the circuit board.
6. The electric compressor according to claim 5 , wherein
the metal part is a ground terminal of the circuit board.
7. The electric compressor according to claim 1 , further comprising:
a temperature sensor fixed to the circuit board, and
a control means for driving the electric motor basing on a result of detection by the temperature sensor.
8. The electric compressor according to claim 7 , wherein
when, in a waiting state of the electric compressor, temperature detected by the temperature sensor rises above an activation temperature, the control means temporarily drives the electric motor.
9. The electric compressor according to claim 8 , wherein
when, in the waiting state of the electric compressor, the temperature detected by the temperature sensor drops to or below a stop temperature, the control means stops the temporarily-driven electric motor.
10. The electric compressor according to claim 1 , further comprising a second circuit board on which electric components for driving the electric motor in cooperation with said electric components on the first circuit board are mounted, wherein
at least one of the electric components on the second circuit board is in contact with said outer side surface.
11. An automotive air conditioning system comprising an electric compressor disposed in an engine room, said electric compressor comprising:
an electric motor for driving a compression unit for compressing a working fluid, enclosed in a housing together with the compression unit,
a division wall dividing the interior of the housing and having an inner side surface in contact with a working fluid before compressed by the compression unit,
a leg integrally formed on an outer side surface of the division wall, and
a first circuit board on which electric components for driving the electric motor are mounted, the first circuit board being fixed to the leg.
12. The automotive air conditioning system according to claim 11 , wherein
at least one of said electric components mounted on the circuit board is in contact with said outer side surface.
13. The automotive air conditioning system according to claim 11 , wherein
a distal end of the leg is in contact with a metal part of the circuit board.
14. The automotive air conditioning system according to claim 13 , wherein
the metal part is a ground terminal of the circuit board.
15. The automotive air conditioning system according to claim 12 , wherein
a distal end of the leg is in contact with a metal part of the circuit board.
16. The automotive air conditioning system according to claim 15 , wherein
the metal part is a ground terminal of the circuit board.
17. The automotive air conditioning system according to claim 11 , wherein the electric compressor further comprises:
a temperature sensor fixed to the circuit board, and
a control means for driving the electric motor basing on a result of detection by the temperature sensor.
18. The automotive air conditioning system according to claim 17 , wherein
when, in a waiting state of the electric compressor, temperature detected by the temperature sensor rises above an activation temperature, the control means temporarily drives the electric motor.
19. The automotive air conditioning system electric compressor according to claim 18 , wherein
when, in the waiting state of the electric compressor, the temperature detected by the temperature sensor drops to or below a stop temperature, the control means stops the temporarily-driven electric motor.
20. The automotive air conditioning system according to claim 11 , wherein
the electric compressor further comprises a second circuit board on which electric components for driving the electric motor in cooperation with said electric components on the first circuit board are mounted, and
at least one of the electric components on the second circuit board is in contact with said outer side surface.
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2006-020483 | 2006-01-30 | ||
JP2006020483A JP2007198341A (en) | 2006-01-30 | 2006-01-30 | Motor driven compressor and vehicular air conditioning system using the same |
PCT/JP2007/050426 WO2007086270A1 (en) | 2006-01-30 | 2007-01-15 | Electric compressor, and air conditioning system for vehicle, using the electric compressor |
Publications (1)
Publication Number | Publication Date |
---|---|
US20100223947A1 true US20100223947A1 (en) | 2010-09-09 |
Family
ID=38309065
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US12/223,129 Abandoned US20100223947A1 (en) | 2006-01-30 | 2007-01-15 | Electric Compressor and Air Conditioning System for vehicle, Using the Electric Compressor |
Country Status (5)
Country | Link |
---|---|
US (1) | US20100223947A1 (en) |
EP (1) | EP1980749B1 (en) |
JP (1) | JP2007198341A (en) |
CN (1) | CN101375057B (en) |
WO (1) | WO2007086270A1 (en) |
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KR20210156850A (en) * | 2019-10-15 | 2021-12-27 | 한온시스템 주식회사 | Gas fluid compression devices and methods of operation of compression devices |
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KR102629937B1 (en) | 2019-10-15 | 2024-01-30 | 한온시스템 주식회사 | Gaseous fluid compression devices and how they work |
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Also Published As
Publication number | Publication date |
---|---|
EP1980749A1 (en) | 2008-10-15 |
EP1980749B1 (en) | 2015-08-26 |
WO2007086270A1 (en) | 2007-08-02 |
CN101375057A (en) | 2009-02-25 |
EP1980749A4 (en) | 2012-12-26 |
CN101375057B (en) | 2011-07-27 |
JP2007198341A (en) | 2007-08-09 |
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Owner name: SANDEN CORPORATION, JAPAN Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNOR:SHIBUYA, MAKOTO;REEL/FRAME:021306/0498 Effective date: 20080530 |
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