JP6031263B2 - Air conditioner - Google Patents
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- JP6031263B2 JP6031263B2 JP2012133425A JP2012133425A JP6031263B2 JP 6031263 B2 JP6031263 B2 JP 6031263B2 JP 2012133425 A JP2012133425 A JP 2012133425A JP 2012133425 A JP2012133425 A JP 2012133425A JP 6031263 B2 JP6031263 B2 JP 6031263B2
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- 239000003507 refrigerant Substances 0.000 claims description 429
- 239000007788 liquid Substances 0.000 claims description 87
- 239000007791 liquid phase Substances 0.000 claims description 33
- 239000012071 phase Substances 0.000 claims description 27
- 238000005192 partition Methods 0.000 claims description 22
- 230000002093 peripheral effect Effects 0.000 claims description 7
- 238000001816 cooling Methods 0.000 claims description 6
- 238000004378 air conditioning Methods 0.000 claims description 3
- 238000000926 separation method Methods 0.000 claims description 2
- 238000000638 solvent extraction Methods 0.000 claims description 2
- 238000004781 supercooling Methods 0.000 description 9
- 230000005494 condensation Effects 0.000 description 6
- 238000009833 condensation Methods 0.000 description 6
- 239000003990 capacitor Substances 0.000 description 5
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 2
- 229910052782 aluminium Inorganic materials 0.000 description 2
- 238000001704 evaporation Methods 0.000 description 2
- 238000009434 installation Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 238000009423 ventilation Methods 0.000 description 2
- 229910000838 Al alloy Inorganic materials 0.000 description 1
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Description
この発明は、たとえば車両にカーエアコンとして搭載される空調装置に関する。 The present invention relates to an air conditioner mounted on a vehicle as a car air conditioner, for example.
この明細書および特許請求の範囲において、「液相冷媒」という用語は、完全に液相のみからなる冷媒の他に、微量の気相冷媒が混入した液相の冷媒を意味するものとし、「気相冷媒」という用語は、完全に気相のみからなる冷媒の他に、微量の液相冷媒が混入した気相の冷媒を意味するものとする。 In this specification and claims, the term “liquid phase refrigerant” means a liquid phase refrigerant in which a trace amount of a gas phase refrigerant is mixed in addition to a refrigerant consisting entirely of a liquid phase. The term “gas-phase refrigerant” means a gas-phase refrigerant in which a very small amount of liquid-phase refrigerant is mixed in addition to a refrigerant consisting entirely of the gas phase.
たとえば車両に搭載される車両用空調装置として、図４に示すように、圧縮機(1)と、圧縮機(1)で圧縮された冷媒を冷却するコンデンサ(2)と、コンデンサ(2)で冷却された高圧冷媒を減圧する膨張弁(3)と、減圧された冷媒を蒸発させるエバポレータ(6)と、高圧冷媒通路(8)および低圧冷媒通路(9)を有しており、かつコンデンサ(2)から流出して高圧冷媒通路(8)を流れる高温高圧の冷媒とエバポレータ(6)から流出して低圧冷媒通路(9)を流れる低温低圧の冷媒とを熱交換させる中間熱交換器(7)と、コンデンサ(2)から流出するとともに膨張弁(3)により減圧される前の高温高圧の冷媒を貯留し、かつ液相と気相とに分離する液溜部(10)とを備えており、膨張弁(3)が、エバポレータ(6)から流出した冷媒が通る第１冷媒流路(5)、および中間熱交換器(7)の高圧冷媒通路(8)から流出するとともにエバポレータ(6)に流入する前の冷媒が通る第２冷媒流路(4)を有し、中間熱交換器(7)とは別個に設けられた液溜部(10)が、コンデンサ(2)と中間熱交換器(7)との間に配置され、冷媒が、中間熱交換器(7)の高圧冷媒通路(8)に流入する前に液溜部(10)内に入るとともに、液溜部(10)内から出た後に中間熱交換器(7)の高圧冷媒通路(8)に流入するようになされている車両用空調装置が知られている（特許文献１参照）。 For example, as a vehicle air conditioner mounted on a vehicle, as shown in FIG. 4, a compressor (1), a condenser (2) for cooling the refrigerant compressed by the compressor (1), and a condenser (2) An expansion valve (3) for decompressing the cooled high-pressure refrigerant, an evaporator (6) for evaporating the decompressed refrigerant, a high-pressure refrigerant passage (8) and a low-pressure refrigerant passage (9), and a condenser ( 2) An intermediate heat exchanger (7) that exchanges heat between the high-temperature and high-pressure refrigerant flowing out of the high-pressure refrigerant passage (8) and the low-temperature and low-pressure refrigerant flowing out of the evaporator (6) and flowing through the low-pressure refrigerant passage (9). ) And a liquid reservoir (10) that stores the high-temperature and high-pressure refrigerant that has flowed out of the condenser (2) and before being decompressed by the expansion valve (3), and that separates it into a liquid phase and a gas phase. The expansion valve (3) has a first refrigerant flow path (5) through which the refrigerant flowing out from the evaporator (6) passes, and a high-pressure refrigerant passage in the intermediate heat exchanger (7). A liquid reservoir (10) having a second refrigerant flow path (4) that flows out from (8) and through which refrigerant before flowing into the evaporator (6) passes, and is provided separately from the intermediate heat exchanger (7). ) Is disposed between the condenser (2) and the intermediate heat exchanger (7), and before the refrigerant flows into the high-pressure refrigerant passage (8) of the intermediate heat exchanger (7), the liquid reservoir (10) There is known a vehicle air conditioner that enters the inside of the liquid reservoir (10) and flows into the high-pressure refrigerant passage (8) of the intermediate heat exchanger (7) after entering the inside (10). 1).
しかしながら、特許文献１記載の車両用空調装置においては、中間熱交換器(7)とは別個に設けられた液溜部(10)が、コンデンサ(2)と中間熱交換器(7)との間に配置されているので、車両用空調装置を設置するためのスペースが大型化するという問題がある。 However, in the vehicle air conditioner described in Patent Document 1, a liquid reservoir (10) provided separately from the intermediate heat exchanger (7) is provided between the condenser (2) and the intermediate heat exchanger (7). Since it is arrange | positioned between, there exists a problem that the space for installing a vehicle air conditioner enlarges.
この発明の目的は、上記問題を解決し、設置スペースを小型化しうる空調装置を提供することにある。 The objective of this invention is providing the air conditioner which can solve the said problem and can reduce installation space.
本発明は、上記目的を達成するために以下の態様からなる。 In order to achieve the above object, the present invention comprises the following aspects.
1)圧縮機と、圧縮機で圧縮された冷媒を冷却するコンデンサと、コンデンサで冷却された高圧冷媒を減圧する膨張弁と、減圧された冷媒を蒸発させるエバポレータと、コンデンサから流出した高圧冷媒とエバポレータから流出した低圧冷媒とを熱交換させる中間熱交換器とを備えており、膨張弁が、エバポレータから流出した冷媒が通る第１冷媒流路、および中間熱交換器から流出するとともにエバポレータに流入する前の冷媒が通る第２冷媒流路を有している空調装置において、
中間熱交換器が、内部に、エバポレータから流出した低圧冷媒が流れる低圧冷媒通路、低圧冷媒通路と一体化するように設けられ、かつコンデンサから流出するとともに膨張弁により減圧される前の高圧の冷媒を貯留して液相と気相とに分離する液溜、および低圧冷媒通路内に配置されかつ高圧冷媒が流れる高圧冷媒流通管を備えており、低圧冷媒通路内を流れる低圧冷媒と、高圧冷媒流通管内を流れる高圧冷媒とが熱交換をするようになされており、
中間熱交換器の低圧冷媒通路および液溜が、１つのケーシング内が隔壁により区画されることによって、低圧冷媒通路が液溜よりも上方に位置するように上下方向に並んで設けられ、中間熱交換器のケーシングにおける低圧冷媒通路を囲む壁部分に、エバポレータから流出した低圧の冷媒を低圧冷媒通路に導入する低圧冷媒導入口、および低圧冷媒通路を通過した低圧冷媒を圧縮機に向けて送り出す低圧冷媒送出口が形成され、中間熱交換器のケーシング内の隔壁に、コンデンサから送り出された高圧の冷媒を液溜に導入する高圧冷媒導入口が形成され、中間熱交換器のケーシングにおける液溜を囲む壁部分に、液溜において気液２相に分離されて得られた液相の高圧冷媒を膨張弁に向けて送り出す高圧冷媒送出口が形成され、高圧冷媒流通管が、ケーシングの低圧冷媒通路内に配置され、高圧冷媒流通管の一端が高圧冷媒導入口を介して液溜内に通じさせられ、同じく他端がケーシングにおける低圧冷媒通路を囲む壁部分に形成された連通口を介してケーシングの外部に通じさせられている空調装置。
1) a compressor, a condenser that cools the refrigerant compressed by the compressor, an expansion valve that decompresses the high-pressure refrigerant cooled by the condenser, an evaporator that evaporates the decompressed refrigerant, and a high-pressure refrigerant that flows out of the condenser An intermediate heat exchanger that exchanges heat with the low-pressure refrigerant that has flowed out of the evaporator, and the expansion valve flows out of the first refrigerant flow path through which the refrigerant that has flowed out of the evaporator passes, and the intermediate heat exchanger, and flows into the evaporator In the air conditioner having the second refrigerant flow path through which the refrigerant before passing,
The intermediate heat exchanger is provided so as to be integrated with the low-pressure refrigerant passage and the low-pressure refrigerant passage through which the low-pressure refrigerant that has flowed out of the evaporator flows, and the high-pressure refrigerant that flows out of the condenser and is decompressed by the expansion valve And a high-pressure refrigerant flow pipe that is disposed in the low-pressure refrigerant passage and through which the high-pressure refrigerant flows, and the high-pressure refrigerant and the high-pressure refrigerant flowing in the low-pressure refrigerant passage It is designed to exchange heat with the high-pressure refrigerant flowing in the distribution pipe .
The low-pressure refrigerant passage and the liquid reservoir of the intermediate heat exchanger are provided side by side in the vertical direction so that the low-pressure refrigerant passage is positioned above the liquid reservoir by partitioning the inside of one casing by the partition wall. A low-pressure refrigerant inlet that introduces low-pressure refrigerant that has flowed out of the evaporator into the low-pressure refrigerant passage, and a low-pressure that sends out the low-pressure refrigerant that has passed through the low-pressure refrigerant passage toward the compressor, on a wall portion surrounding the low-pressure refrigerant passage in the casing of the exchanger A refrigerant outlet is formed, a high-pressure refrigerant inlet for introducing the high-pressure refrigerant sent from the condenser into the liquid reservoir is formed in the partition wall in the casing of the intermediate heat exchanger, and the liquid reservoir in the casing of the intermediate heat exchanger is A high-pressure refrigerant delivery port is formed in the surrounding wall portion to send out a liquid-phase high-pressure refrigerant obtained by separation into a gas-liquid two-phase in a liquid reservoir toward an expansion valve. Is disposed in the low-pressure refrigerant passage of the casing, one end of the high-pressure refrigerant flow pipe is communicated with the liquid reservoir through the high-pressure refrigerant inlet, and the other end is formed in a wall portion surrounding the low-pressure refrigerant passage in the casing. An air conditioner connected to the outside of the casing through the communication port .
2)低圧冷媒導入口および高圧冷媒送出口が、前者が上方に位置するように、中間熱交換器のケーシングにおける低圧冷媒通路を囲む壁部分に形成され、ケーシングの周壁外面に、一端が低圧冷媒導入口に通じる第１流路および一端が高圧冷媒送出口に通じる第２流路を有し、かつ中間熱交換器を膨張弁に接続する継手が固定され、継手の第１流路の他端が膨張弁の第１冷媒流路に通じるとともに、第２流路の他端が膨張弁の第２冷媒流路に通じるようになされている上記1)記載の空調装置。 2) The low-pressure refrigerant inlet and the high-pressure refrigerant outlet are formed in a wall portion surrounding the low-pressure refrigerant passage in the casing of the intermediate heat exchanger so that the former is positioned above, and one end is formed on the outer surface of the peripheral wall of the casing. A joint having a first flow path leading to the inlet and a second flow path having one end leading to the high-pressure refrigerant delivery port and connecting the intermediate heat exchanger to the expansion valve is fixed, and the other end of the first flow path of the joint The air conditioning apparatus according to 1), wherein the air passage communicates with the first refrigerant flow path of the expansion valve and the other end of the second flow path communicates with the second refrigerant flow path of the expansion valve .
3)圧縮機と、圧縮機で圧縮された冷媒を冷却するコンデンサと、高圧冷媒流路および低圧冷媒流路を有し、かつコンデンサで冷却された高圧冷媒を減圧する膨張弁と、減圧された冷媒を蒸発させるエバポレータと、コンデンサから流出した高圧冷媒とエバポレータから流出した低圧冷媒とを熱交換させる中間熱交換器とを備えており、膨張弁が、エバポレータから流出した冷媒が通る第１冷媒流路および中間熱交換器から流出するとともにエバポレータに流入する前の冷媒が通る第２冷媒流路を有している空調装置において、
中間熱交換器が、内部に、エバポレータから流出した低圧冷媒が流れる低圧冷媒通路、低圧冷媒通路と一体化するように設けられ、かつコンデンサから流出するとともに膨張弁により減圧される前の高圧の冷媒を貯留して液相と気相とに分離する液溜、および低圧冷媒通路内に配置されかつ高圧冷媒が流れる高圧冷媒流通管を備えており、低圧冷媒通路内を流れる低圧冷媒と、高圧冷媒流通管内を流れる高圧冷媒とが熱交換をするようになされており、
中間熱交換器の低圧冷媒通路および液溜が、１つのケーシング内が隔壁により区画されることによって、横方向に並んで設けられ、中間熱交換器のケーシングにおける低圧冷媒通路を囲む壁部分に、エバポレータから流出した低圧の冷媒を低圧冷媒通路に導入する低圧冷媒導入口、および低圧冷媒通路を通過した低圧冷媒を圧縮機に向けて送り出す低圧冷媒送出口が形成され、中間熱交換器のケーシングにおける液溜を囲む壁部分に、コンデンサから送り出された高圧の冷媒を液溜に導入する高圧冷媒導入口が形成され、中間熱交換器のケーシング内の隔壁に、液溜において気液２相に分離されて得られた液相の高圧冷媒を膨張弁に向けて送り出す高圧冷媒送出口が形成され、高圧冷媒流通管が、ケーシングの低圧冷媒通路内に配置され、高圧冷媒流通管の一端が高圧冷媒送出口を介して液溜内に通じさせられ、同じく他端がケーシングにおける低圧冷媒通路を囲む壁部分に形成された連通口を介してケーシングの外部に通じさせられている空調装置。
3) a compressor, a condenser that cools the refrigerant compressed by the compressor, an expansion valve that has a high-pressure refrigerant flow path and a low-pressure refrigerant flow path, and depressurizes the high-pressure refrigerant cooled by the condenser; An evaporator that evaporates the refrigerant; and an intermediate heat exchanger that exchanges heat between the high-pressure refrigerant that has flowed out of the condenser and the low-pressure refrigerant that has flowed out of the evaporator. The expansion valve has a first refrigerant flow through which the refrigerant that has flowed out of the evaporator passes. In the air conditioner having the second refrigerant flow path through which the refrigerant before flowing out from the passage and the intermediate heat exchanger passes through the evaporator,
The intermediate heat exchanger is provided so as to be integrated with the low-pressure refrigerant passage and the low-pressure refrigerant passage through which the low-pressure refrigerant that has flowed out of the evaporator flows, and the high-pressure refrigerant that flows out of the condenser and is decompressed by the expansion valve And a high-pressure refrigerant flow pipe that is disposed in the low-pressure refrigerant passage and through which the high-pressure refrigerant flows, and the high-pressure refrigerant and the high-pressure refrigerant flowing in the low-pressure refrigerant passage It is designed to exchange heat with the high-pressure refrigerant flowing in the distribution pipe.
A low-pressure refrigerant passage and a liquid reservoir of the intermediate heat exchanger are provided side by side by dividing the inside of one casing by a partition wall, and a wall portion surrounding the low-pressure refrigerant passage in the casing of the intermediate heat exchanger A low-pressure refrigerant inlet that introduces low-pressure refrigerant that has flowed out of the evaporator into the low-pressure refrigerant passage, and a low-pressure refrigerant outlet that sends out the low-pressure refrigerant that has passed through the low-pressure refrigerant passage toward the compressor are formed in the casing of the intermediate heat exchanger. A high-pressure refrigerant inlet for introducing the high-pressure refrigerant sent from the condenser into the liquid reservoir is formed in the wall portion surrounding the liquid reservoir, and is separated into a gas-liquid two-phase in the liquid reservoir in the partition wall in the casing of the intermediate heat exchanger. A high-pressure refrigerant delivery port for delivering the liquid-phase high-pressure refrigerant thus obtained toward the expansion valve is formed, and the high-pressure refrigerant circulation pipe is disposed in the low-pressure refrigerant passage of the casing. One end of the refrigerant circulation pipe is communicated with the inside of the liquid reservoir through the high-pressure refrigerant delivery port, and the other end is also communicated with the outside of the casing through the communication port formed in the wall portion surrounding the low-pressure refrigerant passage in the casing. and it has air-conditioning system.
4)低圧冷媒導入口および連通口が、前者が上方に位置するように、中間熱交換器のケーシングにおける低圧冷媒通路を囲む壁部分のうちのケーシングの長手方向一端に位置する端壁に形成され、ケーシングの前記端壁外面に、一端が低圧冷媒導入口に通じる第１流路および一端が連通口に通じる第２流路を有し、かつ中間熱交換器を膨張弁に接続する継手が固定され、継手の第１流路の他端が膨張弁の第１冷媒流路に通じるとともに、第２流路の他端が膨張弁の第２冷媒流路に通じるようになされている上記3)記載の空調装置。いる空調装置。 4) The low-pressure refrigerant introduction port and the communication port are formed in the end wall located at one end in the longitudinal direction of the casing of the wall portion surrounding the low-pressure refrigerant passage in the casing of the intermediate heat exchanger so that the former is positioned above. A joint for connecting the intermediate heat exchanger to the expansion valve is fixed to the outer surface of the end wall of the casing, having a first flow path with one end communicating with the low-pressure refrigerant inlet and a second flow path with one end communicating with the communication opening. is, the 3 end of the first passage of the joint together with the leads to the first refrigerant passage of the expansion valve, the other end of the second flow path is adapted to communicate with the second refrigerant passage of the expansion valve) The air conditioner described. Air conditioner.
上記1)〜4)の空調装置によれば、中間熱交換器が、内部に、エバポレータから流出した低圧冷媒が流れる低圧冷媒通路、低圧冷媒通路と一体化するように設けられ、かつコンデンサから流出するとともに膨張弁により減圧される前の高圧の冷媒を貯留して液相と気相とに分離する液溜、および低圧冷媒通路内に配置されかつ高圧冷媒が流れる高圧冷媒流通管を備えており、低圧冷媒通路内を流れる低圧冷媒と、高圧冷媒流通管内を流れる高圧冷媒とが熱交換をするようになされているので、中間熱交換器とは別個に設けられた液溜部が、コンデンサと中間熱交換器との間に配置されている特許文献１記載の空調装置に比較して、設置するためのスペースを小型化することが可能になる。 According to the air conditioners of 1) to 4) above, the intermediate heat exchanger is provided so as to be integrated with the low-pressure refrigerant passage and the low-pressure refrigerant passage through which the low-pressure refrigerant flowing out of the evaporator flows, and out of the condenser. And a liquid reservoir for storing the high-pressure refrigerant before being decompressed by the expansion valve and separating the refrigerant into a liquid phase and a gas phase, and a high-pressure refrigerant circulation pipe disposed in the low-pressure refrigerant passage and through which the high-pressure refrigerant flows. Since the low-pressure refrigerant flowing in the low-pressure refrigerant passage and the high-pressure refrigerant flowing in the high-pressure refrigerant circulation pipe are configured to exchange heat, a liquid reservoir provided separately from the intermediate heat exchanger has a condenser and As compared with the air conditioner described in Patent Document 1 arranged between the intermediate heat exchanger, the space for installation can be reduced.
上記1)および3)の空調装置によれば、低圧冷媒通路および液溜を１つのケーシング内に一体に設けることが可能になり、中間熱交換器をコンパクトにすることができる。したがって、空調装置を設置するためのスペースを、効果的に小型化することが可能になる。 According to the air conditioners 1) and 3) above, the low-pressure refrigerant passage and the liquid reservoir can be provided integrally in one casing, and the intermediate heat exchanger can be made compact. Therefore, the space for installing the air conditioner can be effectively reduced in size.
上記1)および3)の空調装置によれば、中間熱交換器のケーシングに、エバポレータから流出した低圧の冷媒を低圧冷媒通路に導入する低圧冷媒導入口と、低圧冷媒通路を通過した低圧冷媒を圧縮機に向けて送り出す低圧冷媒送出口と、コンデンサから送り出された高圧の冷媒を液溜に導入する高圧冷媒導入口と、液溜において気液２相に分離されたうちの液相の高圧冷媒を膨張弁に向けて送り出す高圧冷媒送出口とが設けられているので、圧縮機で圧縮された後コンデンサにおいて冷却された高温高圧の冷媒が、高圧冷媒流通管内を流れる際にエバポレータから流出しかつ低圧冷媒通路を流れる比較的低温の低圧冷媒により過冷却されるとともに、液溜において液相と気相とに分離され、高圧の液相冷媒が膨張弁に向けて送り出される。また、高圧の冷媒と熱交換した低圧の冷媒は圧縮機に向けて送り出される。 According to the air conditioners of 1) and 3) above, the low-pressure refrigerant inlet that introduces the low-pressure refrigerant that has flowed out of the evaporator into the low-pressure refrigerant passage and the low-pressure refrigerant that has passed through the low-pressure refrigerant passage are disposed in the casing of the intermediate heat exchanger. A low-pressure refrigerant outlet for sending out toward the compressor, a high-pressure refrigerant inlet for introducing the high-pressure refrigerant sent out from the condenser into the liquid reservoir, and a liquid-phase high-pressure refrigerant out of the gas-liquid two phases separated in the liquid reservoir And a high-pressure refrigerant delivery outlet for delivering the refrigerant to the expansion valve, so that the high-temperature and high-pressure refrigerant cooled in the condenser after being compressed by the compressor flows out of the evaporator when flowing in the high-pressure refrigerant circulation pipe, and While being supercooled by a relatively low-temperature low-pressure refrigerant flowing in the low-pressure refrigerant passage, the liquid is separated into a liquid phase and a gas phase in the liquid reservoir, and the high-pressure liquid-phase refrigerant is sent out toward the expansion valve. The low-pressure refrigerant that has exchanged heat with the high-pressure refrigerant is sent out toward the compressor.
上記1)の空調装置によれば、中間熱交換器のケーシングに、低圧冷媒通路および液溜が、前者が上方に位置するように上下方向に並んで設けられ、ケーシングにおける低圧冷媒通路を囲む壁部分に低圧冷媒導入口および低圧冷媒送出口が形成され、低圧冷媒通路と液溜との間の隔壁に高圧冷媒導入口が形成され、ケーシングにおける液溜を囲む壁部分に高圧冷媒送出口が形成され、高圧冷媒流通管の一端が高圧冷媒導入口を介して液溜内に通じさせられ、同じく他端がケーシングにおける低圧冷媒通路を囲む壁部分に形成された連通口を介してケーシングの外部に通じさせられているので、コンデンサから流出した高圧冷媒を高圧冷媒流通管内に流入させると、高圧冷媒流通管内に入った冷媒が液溜内に流入するまでの間に、低圧冷媒通路を流れる冷媒により冷却されることになる。したがって、冷媒を、液溜内に流入する前に過冷却することができ、液溜内の液相冷媒を、気相冷媒に変化することなく液相状態に安定して保つことが可能になって、液溜内において、液相と気相との分離を効率良く行うことができる。その結果、コンデンサの有効コア部の全体を冷媒の凝縮に寄与させることが可能になり、コンデンサの冷媒凝縮効率の低下を防止することができる。しかも、コンデンサの冷媒凝縮効率の低下を防止することができるので、空調装置を循環する冷媒量を減少させる必要がなく、冷房能力の低下を防止することができる。また、中間熱交換器の低圧冷媒通路を流れる冷媒によって、高圧冷媒通路を流れ、かつ液溜部内に流入する冷媒の過冷却が行われるので、冷媒の過冷却が風速や外気温の変動に依存することがなく、安定した過冷却度を得ることができる。 According to the air conditioner of 1) above , the wall surrounding the low-pressure refrigerant passage in the casing is provided with the low-pressure refrigerant passage and the liquid reservoir side by side in the vertical direction so that the former is located above the casing of the intermediate heat exchanger A low-pressure refrigerant inlet and a low-pressure refrigerant outlet are formed in the part, a high-pressure refrigerant inlet is formed in the partition wall between the low-pressure refrigerant passage and the liquid reservoir, and a high-pressure refrigerant outlet is formed in the wall portion surrounding the liquid reservoir in the casing One end of the high-pressure refrigerant flow pipe is communicated with the liquid reservoir via the high-pressure refrigerant inlet, and the other end is also connected to the outside of the casing via the communication port formed in the wall portion surrounding the low-pressure refrigerant passage in the casing. Therefore, when the high-pressure refrigerant that has flowed out of the condenser flows into the high-pressure refrigerant circulation pipe, the low-pressure refrigerant passage is opened until the refrigerant that has entered the high-pressure refrigerant circulation pipe flows into the liquid reservoir. To be cooled by the refrigerant. Therefore, the refrigerant can be supercooled before flowing into the liquid reservoir, and the liquid phase refrigerant in the liquid reservoir can be stably maintained in a liquid phase state without changing to a gas phase refrigerant. Thus, the liquid phase and the gas phase can be efficiently separated in the liquid reservoir. As a result, the entire effective core portion of the capacitor can be contributed to the condensation of the refrigerant, and a decrease in the refrigerant condensation efficiency of the capacitor can be prevented. In addition, since the refrigerant condensation efficiency of the condenser can be prevented from being lowered, it is not necessary to reduce the amount of refrigerant circulating through the air conditioner, and the cooling capacity can be prevented from being lowered. In addition, since the refrigerant flowing through the low-pressure refrigerant passage of the intermediate heat exchanger flows through the high-pressure refrigerant passage and flows into the liquid reservoir, supercooling of the refrigerant depends on changes in wind speed and outside temperature. Therefore, a stable degree of supercooling can be obtained.
上記2)の空調装置によれば、中間熱交換器を空調装置に組み込む際に継手を利用することができるので、組み込み作業が容易になる。 According to the air conditioner of 2) , since the joint can be used when the intermediate heat exchanger is incorporated into the air conditioner, the assembling work is facilitated.
上記3)の空調装置によれば、中間熱交換器のケーシングに、低圧冷媒通路および液溜が横方向に並んで設けられ、ケーシングにおける低圧冷媒通路を囲む壁部分に低圧冷媒導入口および低圧冷媒送出口が形成され、ケーシングにおける液溜を囲む壁部分に高圧冷媒導入口が形成され、低圧冷媒通路と液溜との間の隔壁に高圧冷媒送出口が形成され、高圧冷媒流通管の一端が高圧冷媒送出口を介して液溜内に通じさせられ、同じく他端がケーシングにおける低圧冷媒通路を囲む壁部分に形成された連通口を介してケーシングの外部に通じさせられているので、液溜において気相と液相に分離された冷媒のうちの液相冷媒が、高圧冷媒流通管内に入った後膨張弁に送られるまでの間に、低圧冷媒通路を流れる冷媒により冷却されることになる。したがって、冷媒の過冷却が風速や外気温の変動に依存することがなく、安定した過冷却度を得ることができる。 According to the air conditioner of 3) above , the low-pressure refrigerant passage and the liquid reservoir are provided side by side in the casing of the intermediate heat exchanger, and the low-pressure refrigerant inlet and the low-pressure refrigerant are provided in the wall portion surrounding the low-pressure refrigerant passage in the casing. A delivery port is formed, a high-pressure refrigerant inlet is formed in a wall portion surrounding the liquid reservoir in the casing, a high-pressure refrigerant delivery port is formed in a partition wall between the low-pressure refrigerant passage and the liquid reservoir, and one end of the high-pressure refrigerant circulation pipe is Since the other end is communicated with the outside of the casing through the communication port formed in the wall portion surrounding the low-pressure refrigerant passage in the casing, the liquid reservoir is communicated with the liquid reservoir via the high-pressure refrigerant delivery port. The liquid phase refrigerant out of the refrigerant separated into the gas phase and the liquid phase is cooled by the refrigerant flowing through the low pressure refrigerant passage before it enters the high pressure refrigerant circulation pipe and is sent to the expansion valve. . Therefore, the supercooling of the refrigerant does not depend on the fluctuation of the wind speed or the outside air temperature, and a stable supercooling degree can be obtained.
上記4)の空調装置によれば、中間熱交換器を空調装置に組み込む際に継手を利用することができるので、組み込み作業が容易になる。 According to the air conditioner of 4) above , since the joint can be used when the intermediate heat exchanger is incorporated into the air conditioner, the assembling work is facilitated.
以下、この発明の実施形態を、図面を参照して説明する。この実施形態は、この発明の空調装置を、車両に搭載される車両用空調装置に適用したものである。 Embodiments of the present invention will be described below with reference to the drawings. In this embodiment, the air conditioner of the present invention is applied to a vehicle air conditioner mounted on a vehicle.
以下の説明において、図２および図３の上下、左右を上下、左右というものとする。なお、以下の説明において、図４に示すものと同一物には同一符号を付す。 In the following description, the top and bottom, left and right in FIGS. 2 and 3 are referred to as top and bottom and left and right. In the following description, the same components as those shown in FIG.
また、以下の説明において、「アルミニウム」という用語には、純アルミニウムの他にアルミニウム合金を含むものとする。 In the following description, the term “aluminum” includes aluminum alloys in addition to pure aluminum.
図１はこの発明を適用した車両空調装置の構成を示し、図２は図１の車両用空調装置に用いられる中間熱交換器を示す。 FIG. 1 shows a configuration of a vehicle air conditioner to which the present invention is applied, and FIG. 2 shows an intermediate heat exchanger used in the vehicle air conditioner of FIG.
図１において、車両用空調装置は、圧縮機(1)と、圧縮機(1)で圧縮された冷媒を冷却するコンデンサ(2)と、第１冷媒流路(5)および第２冷媒流路(4)を有し、かつコンデンサ(2)で冷却された高圧冷媒を減圧する膨張弁(3)と、減圧された冷媒を蒸発させるエバポレータ(6)と、コンデンサ(2)から流出した高圧冷媒とエバポレータ(6)から流出した低圧冷媒とを熱交換させる中間熱交換器(20)とを備えている。 In FIG. 1, the vehicle air conditioner includes a compressor (1), a condenser (2) for cooling the refrigerant compressed by the compressor (1), a first refrigerant channel (5), and a second refrigerant channel. (4) and an expansion valve (3) for depressurizing the high-pressure refrigerant cooled by the condenser (2), an evaporator (6) for evaporating the decompressed refrigerant, and the high-pressure refrigerant flowing out of the condenser (2) And an intermediate heat exchanger (20) for exchanging heat between the low-pressure refrigerant flowing out of the evaporator (6).
図１および図２に示すように、中間熱交換器(20)は、内部に、エバポレータ(6)から流出した低圧冷媒が流れる低圧冷媒通路(22)、および隔壁(24)により低圧冷媒通路(22)と隔てられ、かつコンデンサ(2)から流出するとともに膨張弁(3)により減圧される前の高圧の冷媒を貯留して液相と気相とに分離する液溜(23)を有するケーシング(21)と、ケーシング(21)の低圧冷媒通路(22)内に配置されかつ高圧冷媒が流れる高圧冷媒流通管(25)とを備えており、高圧冷媒流通管(25)内を流れる高圧冷媒と、ケーシング(21)の低圧冷媒通路(22)内を流れる低圧冷媒とが熱交換をするようになされている。 As shown in FIGS. 1 and 2, the intermediate heat exchanger (20) includes a low-pressure refrigerant passage (22) through which a low-pressure refrigerant flowing out of the evaporator (6) flows, and a partition wall (24). 22) and a casing having a liquid reservoir (23) that stores the high-pressure refrigerant that flows out of the condenser (2) and is decompressed by the expansion valve (3) and separates it into a liquid phase and a gas phase. (21) and a high-pressure refrigerant flow pipe (25) disposed in the low-pressure refrigerant passage (22) of the casing (21) and through which the high-pressure refrigerant flows, and the high-pressure refrigerant flowing in the high-pressure refrigerant flow pipe (25) The low-pressure refrigerant flowing in the low-pressure refrigerant passage (22) of the casing (21) exchanges heat.
中間熱交換器(20)のケーシング(21)は、長手方向を上下方向に向けて配置されるとともに上下両端が閉鎖された円筒状であり、ケーシング(21)には、低圧冷媒通路(22)および液溜(23)が、前者が上方に位置するように、隔壁(24)を介して上下方向に並んで設けられている。なお、中間熱交換器(20)には、別個に形成された低圧冷媒通路(22)と液溜(23)とが一体化するように設けられていてもよい。 The casing (21) of the intermediate heat exchanger (20) has a cylindrical shape that is disposed with its longitudinal direction oriented in the vertical direction and closed at both upper and lower ends, and the casing (21) includes a low-pressure refrigerant passage (22). The liquid reservoir (23) is provided in the vertical direction through the partition wall (24) so that the former is located above. The intermediate heat exchanger (20) may be provided with a separately formed low-pressure refrigerant passage (22) and a liquid reservoir (23).
中間熱交換器(20)のケーシング(21)に、エバポレータ(6)から流出した低圧の冷媒を低圧冷媒通路(22)に導入する低圧冷媒導入口(26)と、低圧冷媒通路(22)を通過した低圧冷媒を圧縮機(1)に向けて送り出す低圧冷媒送出口(27)と、コンデンサ(2)から送り出された高圧の冷媒を液溜(23)に導入する高圧冷媒導入口(28)と、液溜(23)において気液２相に分離されて得られた液相の高圧冷媒を膨張弁(3)に向けて送り出す高圧冷媒送出口(29)とが設けられている。 The casing (21) of the intermediate heat exchanger (20) has a low-pressure refrigerant inlet (26) for introducing the low-pressure refrigerant flowing out of the evaporator (6) into the low-pressure refrigerant passage (22), and a low-pressure refrigerant passage (22). Low-pressure refrigerant outlet (27) for sending the low-pressure refrigerant that has passed to the compressor (1), and high-pressure refrigerant inlet (28) for introducing the high-pressure refrigerant sent from the condenser (2) into the liquid reservoir (23) And a high-pressure refrigerant delivery port (29) for sending out the liquid-phase high-pressure refrigerant obtained by being separated into gas-liquid two phases in the liquid reservoir (23) toward the expansion valve (3).
低圧冷媒導入口(26)は、ケーシング(21)における低圧冷媒通路(22)を囲む壁部分、ここではケーシング(21)の周壁(21a)における隔壁(24)よりも上方の部分に形成され、低圧冷媒送出口(27)は、ケーシング(21)における低圧冷媒通路(22)を囲む壁部分、ここではケーシング(21)の頂壁(21b)に形成されている。低圧冷媒送出口(27)に、圧縮機(1)に低圧冷媒を送る配管が接続されている。高圧冷媒導入口(28)は、隔壁(24)に形成され、高圧冷媒送出口(29)は、ケーシング(21)における液溜(23)を囲む壁部分、ここでは周壁(21a)における隔壁(24)よりも下方でかつ低圧冷媒導入口(26)の真下に位置する部分に形成されている。なお、高圧冷媒送出口(29)が設けられる高さ位置は、液溜(23)において冷媒が気相と液相とに分離された際の液相冷媒の液面の高さ位置よりも下方である。 The low-pressure refrigerant inlet (26) is formed in a wall portion surrounding the low-pressure refrigerant passage (22) in the casing (21), here, in a portion above the partition wall (24) in the peripheral wall (21a) of the casing (21), The low-pressure refrigerant delivery port (27) is formed in a wall portion surrounding the low-pressure refrigerant passage (22) in the casing (21), here, the top wall (21b) of the casing (21). A pipe for sending the low-pressure refrigerant to the compressor (1) is connected to the low-pressure refrigerant outlet (27). The high-pressure refrigerant inlet (28) is formed in the partition wall (24), and the high-pressure refrigerant delivery port (29) is a wall portion surrounding the liquid reservoir (23) in the casing (21), here the partition wall in the peripheral wall (21a) ( 24) and below the low-pressure refrigerant inlet (26). The height position where the high-pressure refrigerant delivery port (29) is provided is lower than the height position of the liquid level of the liquid phase refrigerant when the refrigerant is separated into the gas phase and the liquid phase in the liquid reservoir (23). It is.
ケーシング(21)の周壁(21a)外面に、一端が低圧冷媒導入口(26)に通じる第１流路(32)、および一端が高圧冷媒送出口(29)に通じる第２流路(33)を有し、かつ中間熱交換器(20)を膨張弁(3)に接続する継手(31)が固定されている。継手(31)の第１流路(32)の他端が膨張弁(3)の第１冷媒流路(5)に通じるとともに、第２流路(33)の他端が膨張弁(3)の第２冷媒流路(4)に通じるようになされている。 On the outer surface of the peripheral wall (21a) of the casing (21), a first channel (32) with one end communicating with the low-pressure refrigerant inlet (26) and a second channel (33) with one end communicating with the high-pressure refrigerant delivery port (29) And a joint (31) connecting the intermediate heat exchanger (20) to the expansion valve (3) is fixed. The other end of the first flow path (32) of the joint (31) communicates with the first refrigerant flow path (5) of the expansion valve (3), and the other end of the second flow path (33) is the expansion valve (3). The second refrigerant flow path (4).
高圧冷媒流通管(25)の下端は高圧冷媒導入口(28)に通されて隔壁(24)に固定されており、高圧冷媒導入口(28)を介して液溜(23)内に通じさせられている。高圧冷媒流通管(25)の上端は、ケーシング(21)における低圧冷媒通路(22)を囲む壁部分、ここでは頂壁(21b)に形成された連通口(35)に通されて頂壁(21b)に固定されており、連通口(35)を介してケーシング(21)の外部に通じさせられている。高圧冷媒流通管(25)の上端には、コンデンサ(2)から高圧冷媒を供給する配管が接続されている。 The lower end of the high-pressure refrigerant flow pipe (25) is passed through the high-pressure refrigerant inlet (28) and fixed to the partition wall (24), and is communicated with the liquid reservoir (23) through the high-pressure refrigerant inlet (28). It has been. The upper end of the high-pressure refrigerant flow pipe (25) is passed through a wall portion surrounding the low-pressure refrigerant passage (22) in the casing (21), here, the communication port (35) formed in the top wall (21b). It is fixed to 21b) and communicates with the outside of the casing (21) through the communication port (35). A pipe for supplying high-pressure refrigerant from the condenser (2) is connected to the upper end of the high-pressure refrigerant circulation pipe (25).
図１に示す車両用空調装置において、圧縮機(1)で圧縮された高温高圧の気液混相の冷媒は、コンデンサ(2)において冷却され、中間熱交換器(20)の高圧冷媒流通管(25)内に上端開口から入る。高圧冷媒流通管(25)内に入った高圧冷媒は高圧冷媒流通管(25)内を下方に流れて液溜(23)内に流入し、液溜(23)内において液相と気相とに分離される。そして、液溜(23)内において得られた液相冷媒が、高圧冷媒送出口(29)および継手(31)の第２流路(33)を通って膨張弁(3)の第２冷媒流路(4)内に入り、ここで減圧された後エバポレータ(6)に入り、エバポレータ(6)内を流れる間に通風間隙を流れる空気を冷却して気相となる。エバポレータ(6)を通過した比較的低温の冷媒は、膨張弁(3)の第１冷媒流路(5)、継手(31)の第１流路(32)および中間熱交換器(20)の低圧冷媒導入口(26)を通って中間熱交換器(20)の低圧冷媒通路(22)内に入り、低圧冷媒通路(22)内を流れるとともに配管を通って圧縮機(1)に送られる。 In the vehicle air conditioner shown in FIG. 1, the high-temperature and high-pressure gas-liquid mixed phase refrigerant compressed by the compressor (1) is cooled in the condenser (2), and the high-pressure refrigerant flow pipe ( 25) Enter from the top opening. The high-pressure refrigerant that has entered the high-pressure refrigerant flow pipe (25) flows downward in the high-pressure refrigerant flow pipe (25) and flows into the liquid reservoir (23). Separated. Then, the liquid phase refrigerant obtained in the liquid reservoir (23) passes through the high pressure refrigerant delivery port (29) and the second flow path (33) of the joint (31), and the second refrigerant flow of the expansion valve (3). The air enters the passage (4), is decompressed here, enters the evaporator (6), and cools the air flowing through the ventilation gap while flowing through the evaporator (6) to become a gas phase. The relatively low-temperature refrigerant that has passed through the evaporator (6) passes through the first refrigerant passage (5) of the expansion valve (3), the first passage (32) of the joint (31), and the intermediate heat exchanger (20). The refrigerant enters the low-pressure refrigerant passage (22) of the intermediate heat exchanger (20) through the low-pressure refrigerant inlet (26), flows through the low-pressure refrigerant passage (22), and is sent to the compressor (1) through the pipe. .
ここで、コンデンサ(2)から送られて中間熱交換器(20)の高圧冷媒流通管(25)内に入った高温高圧の冷媒は、高圧冷媒流通管(25)内を流れる間に、中間熱交換器(20)の低圧冷媒通路(22)内を流れる低温低圧の冷媒により冷却されるので、液溜(23)内に流入する冷媒が過冷却状態となる。したがって、液溜(23)内の液相冷媒を液相状態に安定して保つことが可能になって、液溜(23)内において、液相と気相との分離を効率良く行うことができる。その結果、コンデンサ(2)の有効コア部の全体を冷媒の凝縮に寄与させることが可能になり、コンデンサ(2)の冷媒凝縮効率の低下を防止することができる。しかも、コンデンサ(2)の冷媒凝縮効率の低下を防止することができるので、車両用空調装置を循環する冷媒量を減少させる必要がなく、冷房能力の低下を防止することができる。また、中間熱交換器(20)の低圧冷媒通路(22)を流れる冷媒によって、高圧冷媒流通管(25)内を流れ、かつ液溜(23)内に流入する冷媒の過冷却が行われるので、冷媒の過冷却が風速や外気温の変動に依存することがなく、安定した過冷却度を得ることができる。 Here, the high-temperature and high-pressure refrigerant sent from the condenser (2) and entering the high-pressure refrigerant circulation pipe (25) of the intermediate heat exchanger (20) Since it is cooled by the low-temperature and low-pressure refrigerant flowing in the low-pressure refrigerant passage (22) of the heat exchanger (20), the refrigerant flowing into the liquid reservoir (23) is in a supercooled state. Therefore, the liquid phase refrigerant in the liquid reservoir (23) can be stably maintained in a liquid phase state, and the liquid phase and the gas phase can be efficiently separated in the liquid reservoir (23). it can. As a result, the entire effective core portion of the condenser (2) can be contributed to the condensation of the refrigerant, and a reduction in the refrigerant condensation efficiency of the condenser (2) can be prevented. In addition, since the refrigerant condensation efficiency of the condenser (2) can be prevented from being lowered, it is not necessary to reduce the amount of refrigerant circulating through the vehicle air conditioner, and the cooling capacity can be prevented from being lowered. In addition, since the refrigerant flowing through the low-pressure refrigerant passage (22) of the intermediate heat exchanger (20), the refrigerant flowing in the high-pressure refrigerant circulation pipe (25) and flowing into the liquid reservoir (23) is supercooled. In addition, the supercooling of the refrigerant does not depend on the fluctuation of the wind speed or the outside air temperature, and a stable supercooling degree can be obtained.
図３は図１の車両用空調装置に用いられる中間熱交換器の変形例を示す。 FIG. 3 shows a modification of the intermediate heat exchanger used in the vehicle air conditioner of FIG.
図３において、中間熱交換器(40)は、内部に、エバポレータ(6)から流出した低圧冷媒が流れる低圧冷媒通路(42)、および隔壁(44)により低圧冷媒通路(42)と隔てられ、かつコンデンサ(2)から流出するとともに膨張弁(3)により減圧される前の高圧の冷媒を貯留して液相と気相とに分離する液溜(43)を有するケーシング(41)と、ケーシング(41)の低圧冷媒通路(42)内に配置されかつ高圧冷媒が流れる高圧冷媒流通管(45)とを備えており、高圧冷媒流通管(45)内を流れる高圧冷媒と、ケーシング(41)の低圧冷媒通路(42)内を流れる低圧冷媒とが熱交換をするようになされている。 In FIG. 3, the intermediate heat exchanger (40) is separated from the low pressure refrigerant passage (42) by a low pressure refrigerant passage (42) through which the low pressure refrigerant flowing out of the evaporator (6) flows and a partition wall (44). And a casing (41) having a liquid reservoir (43) that stores the high-pressure refrigerant that flows out of the condenser (2) and is decompressed by the expansion valve (3) and separates it into a liquid phase and a gas phase, and the casing A high-pressure refrigerant flow pipe (45) disposed in the low-pressure refrigerant passage (42) of the (41) and through which the high-pressure refrigerant flows, and a casing (41) The low-pressure refrigerant flowing in the low-pressure refrigerant passage (42) exchanges heat.
中間熱交換器(40)のケーシング(41)は、長手方向を左右方向（横方向）に向けて配置されるとともに左右両端が閉鎖された円筒状であり、ケーシング(41)には、低圧冷媒通路(42)および液溜(43)が、前者が右方に位置するように、隔壁(44)を介して左右方向（横方向）に並んで設けられている。なお、中間熱交換器(40)には、別個に形成された低圧冷媒通路(42)と液溜(43)とが一体化するように設けられていてもよい。 The casing (41) of the intermediate heat exchanger (40) has a cylindrical shape in which the longitudinal direction is disposed in the left-right direction (lateral direction) and the left and right ends are closed. The casing (41) includes a low-pressure refrigerant. The passage (42) and the liquid reservoir (43) are provided side by side in the left-right direction (lateral direction) via the partition wall (44) so that the former is located on the right side. The intermediate heat exchanger (40) may be provided so that the low-pressure refrigerant passage (42) and the liquid reservoir (43) formed separately are integrated.
中間熱交換器(40)のケーシング(41)に、エバポレータ(6)から流出した低圧の冷媒を低圧冷媒通路(42)に導入する低圧冷媒導入口(46)と、低圧冷媒通路(42)を通過した低圧冷媒を圧縮機(1)に向けて送り出す低圧冷媒送出口(47)と、コンデンサ(2)から送り出された高圧の冷媒を液溜(43)に導入する高圧冷媒導入口(48)と、液溜(43)において気液２相に分離されたうちの液相の高圧冷媒を膨張弁(3)に向けて送り出す高圧冷媒送出口(49)とが設けられている。 The casing (41) of the intermediate heat exchanger (40) has a low-pressure refrigerant inlet (46) for introducing the low-pressure refrigerant flowing out of the evaporator (6) into the low-pressure refrigerant passage (42), and a low-pressure refrigerant passage (42). The low-pressure refrigerant outlet (47) for sending the low-pressure refrigerant that has passed through to the compressor (1), and the high-pressure refrigerant inlet (48) for introducing the high-pressure refrigerant sent from the condenser (2) into the liquid reservoir (43) And a high-pressure refrigerant delivery port (49) for sending out the liquid-phase high-pressure refrigerant separated into the gas-liquid two phases in the liquid reservoir (43) toward the expansion valve (3).
低圧冷媒導入口(46)は、ケーシング(41)における低圧冷媒通路(42)を囲む壁部分、ここではケーシング(41)の右端壁(41a)に形成され、低圧冷媒送出口(47)は、ケーシング(41)における低圧冷媒通路(42)を囲む壁部分、ここではケーシング(41)の周壁(41b)における隔壁(44)よりも右方の部分に形成されている。低圧冷媒送出口(47)には、圧縮機(1)に低圧冷媒を送る配管が接続されている。高圧冷媒導入口(48)は、ケーシング(41)における液溜(43)を囲む壁部分、ここでは周壁(41b)における隔壁(44)よりも左方の部分に形成され、高圧冷媒送出口(49)は隔壁(44)の下側部分に形成されている。なお、高圧冷媒送出口(49)が設けられる高さ位置は、液溜(43)において冷媒が気相と液相とに分離された際の液相冷媒の液面の高さ位置よりも下方である。高圧冷媒導入口(48)には、コンデンサ(2)から高圧冷媒を供給する配管が接続されている。 The low-pressure refrigerant inlet (46) is formed in the wall portion surrounding the low-pressure refrigerant passage (42) in the casing (41), here the right end wall (41a) of the casing (41), and the low-pressure refrigerant outlet (47) is A wall portion surrounding the low-pressure refrigerant passage (42) in the casing (41), here, a portion on the right side of the partition wall (44) in the peripheral wall (41b) of the casing (41) is formed. A pipe for sending low-pressure refrigerant to the compressor (1) is connected to the low-pressure refrigerant delivery port (47). The high-pressure refrigerant inlet (48) is formed in a wall portion surrounding the liquid reservoir (43) in the casing (41), in this case, on the left side of the partition wall (44) in the peripheral wall (41b). 49) is formed in the lower part of the partition wall (44). The height position where the high-pressure refrigerant delivery port (49) is provided is lower than the height position of the liquid level of the liquid-phase refrigerant when the refrigerant is separated into the gas phase and the liquid phase in the liquid reservoir (43). It is. A pipe for supplying high-pressure refrigerant from the capacitor (2) is connected to the high-pressure refrigerant inlet (48).
高圧冷媒流通管(45)の左端は高圧冷媒送出口(49)を通されて隔壁(44)に固定されており、高圧冷媒送出口(49)を介して液溜(43)内に通じさせられている。高圧冷媒流通管(45)の右端は、ケーシング(41)における低圧冷媒通路(42)を囲む壁部分、ここでは右端壁(41a)に形成された連通口(51)に通じるように右端壁(41a)に固定されており、連通口(51)を介してケーシング(41)の外部に通じさせられている。右端壁(41a)の連通口(51)は、低圧冷媒導入口(46)の真下の位置に形成されている。 The left end of the high-pressure refrigerant circulation pipe (45) is fixed to the partition wall (44) through the high-pressure refrigerant delivery port (49), and communicated with the liquid reservoir (43) through the high-pressure refrigerant delivery port (49). It has been. The right end of the high-pressure refrigerant flow pipe (45) is a right end wall (51) that communicates with a wall portion surrounding the low-pressure refrigerant passage (42) in the casing (41), in this case, the communication port (51) formed in the right end wall (41a). 41a) and communicated with the outside of the casing (41) through the communication port (51). The communication port (51) of the right end wall (41a) is formed at a position directly below the low-pressure refrigerant introduction port (46).
ケーシング(41)の右端壁(41a)外面に、一端が低圧冷媒導入口(46)に通じる第１流路(32)、ならびに一端が連通口(51)および高圧冷媒流通管(25)を介して高圧冷媒送出口(49)に通じる第２流路(33)を有し、かつ中間熱交換器(40)を膨張弁(3)に接続する継手(31)が固定されている。継手(31)の第１流路(32)の他端が膨張弁(3)の第１冷媒流路(5)に通じるとともに、第２流路(33)の他端が膨張弁(3)の第２冷媒流路(4)に通じるようになされている。 The outer surface of the right end wall (41a) of the casing (41) has a first channel (32) having one end communicating with the low-pressure refrigerant inlet (46), and one end via the communication port (51) and the high-pressure refrigerant circulation pipe (25). A joint (31) having a second flow path (33) communicating with the high-pressure refrigerant delivery port (49) and connecting the intermediate heat exchanger (40) to the expansion valve (3) is fixed. The other end of the first flow path (32) of the joint (31) communicates with the first refrigerant flow path (5) of the expansion valve (3), and the other end of the second flow path (33) is the expansion valve (3). The second refrigerant flow path (4).
図３に示す中間熱交換器(40)を備えた車両用空調装置において、圧縮機(1)で圧縮された高温高圧の気液混相の冷媒は、コンデンサ(2)において冷却され、配管を通ってケーシング(41)の液溜(43)内に流入し、液溜(43)内において液相と気相とに分離される。液溜(43)内において得られた高圧の液相冷媒は、高圧冷媒流通管(45)内に左端開口から入って高圧冷媒流通管(45)内を右方に流れ、連通口(51)および継手(31)の第２流路(33)を通って膨張弁(3)の第１冷媒流路(4)内に入り、ここで減圧された後エバポレータ(6)に入り、エバポレータ(6)内を流れる間に通風間隙を流れる空気を冷却して気相となる。エバポレータ(6)を通過した比較的低温の冷媒は、膨張弁(3)の第１冷媒流路(5)、継手(31)の第１流路(32)および中間熱交換器(40)の低圧冷媒導入口(46)を通って中間熱交換器(40)の低圧冷媒通路(42)内に入って低圧冷媒通路(42)を流れ、低温冷媒送出口(47)から配管を通って圧縮機(1)に送られる。 In the vehicle air conditioner equipped with the intermediate heat exchanger (40) shown in FIG. 3, the high-temperature and high-pressure gas-liquid mixed phase refrigerant compressed by the compressor (1) is cooled in the condenser (2) and passes through the pipe. Then, it flows into the liquid reservoir (43) of the casing (41) and is separated into a liquid phase and a gas phase in the liquid reservoir (43). The high-pressure liquid-phase refrigerant obtained in the liquid reservoir (43) enters the high-pressure refrigerant circulation pipe (45) from the left end opening and flows to the right in the high-pressure refrigerant circulation pipe (45). And into the first refrigerant flow path (4) of the expansion valve (3) through the second flow path (33) of the joint (31), and after being depressurized here, enters the evaporator (6), and the evaporator (6 ) While flowing through the inside, the air flowing through the ventilation gap is cooled to become a gas phase. The relatively low-temperature refrigerant that has passed through the evaporator (6) passes through the first refrigerant channel (5) of the expansion valve (3), the first channel (32) of the joint (31), and the intermediate heat exchanger (40). Passes through the low-pressure refrigerant inlet (46), enters the low-pressure refrigerant passage (42) of the intermediate heat exchanger (40), flows through the low-pressure refrigerant passage (42), and is compressed through the piping from the low-temperature refrigerant outlet (47). Sent to machine (1).
ここで、コンデンサ(2)から送られ、中間熱交換器(40)の液溜(43)を経て高圧冷媒流通管(45)内に入った高温高圧の液相冷媒は、高圧冷媒流通管(45)内を流れる間に、中間熱交換器(40)の低圧冷媒通路(42)内を流れる低温低圧の冷媒により冷却される。したがって、中間熱交換器(40)の低圧冷媒通路(42)を流れる冷媒によって、高圧冷媒流通管(45)内を流れる冷媒の過冷却が行われるので、冷媒の過冷却が風速や外気温の変動に依存することがなく、安定した過冷却度を得ることができる。 Here, the high-temperature and high-pressure liquid phase refrigerant sent from the condenser (2) and entered the high-pressure refrigerant circulation pipe (45) through the liquid reservoir (43) of the intermediate heat exchanger (40) is a high-pressure refrigerant circulation pipe ( 45) While flowing through the inside, it is cooled by the low-temperature and low-pressure refrigerant flowing through the low-pressure refrigerant passage (42) of the intermediate heat exchanger (40). Therefore, the refrigerant flowing through the high-pressure refrigerant flow pipe (45) is supercooled by the refrigerant flowing through the low-pressure refrigerant passage (42) of the intermediate heat exchanger (40). A stable degree of supercooling can be obtained without depending on fluctuations.
上述した実施形態において、コンデンサ(2)として、凝縮部、過冷却部および凝縮部と過冷却部とに跨って設けられた受液器を備えたサブクールコンデンサを用いてもよい。 In the embodiment described above, a subcool condenser including a condenser, a supercooling unit, and a liquid receiver provided across the condenser and the supercooling unit may be used as the capacitor (2).
この発明による空調装置は、車両に搭載される車両用空調装置に好適に用いられる。 The air conditioner according to the present invention is suitably used for a vehicle air conditioner mounted on a vehicle.
(1)：圧縮機
(2)：コンデンサ
(3)：膨張弁
(4)：第２冷媒流路
(5)：第１冷媒流路
(6)：エバポレータ
(20)(40)：中間熱交換器
(21)(41)：ケーシング
(21a)：周壁
(21b)：頂壁
(22)(42)：低圧冷媒通路
(23)(43)：液溜
(24)(44)：隔壁
(25)(45)：高圧冷媒流通管
(26)(46)：低圧冷媒導入口
(27)(47)：低圧冷媒送出口
(28)(48)：高圧冷媒導入口
(29)(49)：高圧冷媒送出口
(31)：継手
(32)：第１流路
(33)：第２流路
(35)(51)：連通口
(41a)：右端壁
(41b)：周壁
(1): Compressor
(2): Capacitor
(3): Expansion valve
(4): Second refrigerant flow path
(5): First refrigerant flow path
(6): Evaporator
(20) (40): Intermediate heat exchanger
(21) (41): Casing
(21a): Perimeter wall
(21b): Top wall
(22) (42): Low-pressure refrigerant passage
(23) (43): Liquid reservoir
(24) (44): Bulkhead
(25) (45): High-pressure refrigerant distribution pipe
(26) (46): Low-pressure refrigerant inlet
(27) (47): Low-pressure refrigerant outlet
(28) (48): High-pressure refrigerant inlet
(29) (49): High-pressure refrigerant outlet
(31): Fitting
(32): First flow path
(33): Second flow path
(35) (51): Communication port
(41a): Right end wall
(41b): Perimeter wall
Claims (4)
中間熱交換器が、内部に、エバポレータから流出した低圧冷媒が流れる低圧冷媒通路、低圧冷媒通路と一体化するように設けられ、かつコンデンサから流出するとともに膨張弁により減圧される前の高圧の冷媒を貯留して液相と気相とに分離する液溜、および低圧冷媒通路内に配置されかつ高圧冷媒が流れる高圧冷媒流通管を備えており、低圧冷媒通路内を流れる低圧冷媒と、高圧冷媒流通管内を流れる高圧冷媒とが熱交換をするようになされており、
中間熱交換器の低圧冷媒通路および液溜が、１つのケーシング内が隔壁により区画されることによって、低圧冷媒通路が液溜よりも上方に位置するように上下方向に並んで設けられ、中間熱交換器のケーシングにおける低圧冷媒通路を囲む壁部分に、エバポレータから流出した低圧の冷媒を低圧冷媒通路に導入する低圧冷媒導入口、および低圧冷媒通路を通過した低圧冷媒を圧縮機に向けて送り出す低圧冷媒送出口が形成され、中間熱交換器のケーシング内の隔壁に、コンデンサから送り出された高圧の冷媒を液溜に導入する高圧冷媒導入口が形成され、中間熱交換器のケーシングにおける液溜を囲む壁部分に、液溜において気液２相に分離されて得られた液相の高圧冷媒を膨張弁に向けて送り出す高圧冷媒送出口が形成され、高圧冷媒流通管が、ケーシングの低圧冷媒通路内に配置され、高圧冷媒流通管の一端が高圧冷媒導入口を介して液溜内に通じさせられ、同じく他端がケーシングにおける低圧冷媒通路を囲む壁部分に形成された連通口を介してケーシングの外部に通じさせられている空調装置。 A compressor, a condenser for cooling the refrigerant compressed by the compressor, an expansion valve having a high-pressure refrigerant flow path and a low-pressure refrigerant flow path for depressurizing the high-pressure refrigerant cooled by the condenser, and a decompressed refrigerant An evaporator to be evaporated, an intermediate heat exchanger for exchanging heat between the high-pressure refrigerant flowing out of the condenser and the low-pressure refrigerant flowing out of the evaporator, and the expansion valve has a first refrigerant flow path through which the refrigerant flowing out of the evaporator passes and In the air conditioner having the second refrigerant flow path through which the refrigerant before flowing out from the intermediate heat exchanger and flowing into the evaporator passes,
The intermediate heat exchanger is provided so as to be integrated with the low-pressure refrigerant passage and the low-pressure refrigerant passage through which the low-pressure refrigerant that has flowed out of the evaporator flows, and the high-pressure refrigerant that flows out of the condenser and is decompressed by the expansion valve And a high-pressure refrigerant flow pipe that is disposed in the low-pressure refrigerant passage and through which the high-pressure refrigerant flows, and the high-pressure refrigerant and the high-pressure refrigerant flowing in the low-pressure refrigerant passage It is designed to exchange heat with the high-pressure refrigerant flowing in the distribution pipe .
The low-pressure refrigerant passage and the liquid reservoir of the intermediate heat exchanger are provided side by side in the vertical direction so that the low-pressure refrigerant passage is positioned above the liquid reservoir by partitioning the inside of one casing by the partition wall. A low-pressure refrigerant inlet that introduces low-pressure refrigerant that has flowed out of the evaporator into the low-pressure refrigerant passage, and a low-pressure that sends out the low-pressure refrigerant that has passed through the low-pressure refrigerant passage toward the compressor, on a wall portion surrounding the low-pressure refrigerant passage in the casing of the exchanger A refrigerant outlet is formed, a high-pressure refrigerant inlet for introducing the high-pressure refrigerant sent from the condenser into the liquid reservoir is formed in the partition wall in the casing of the intermediate heat exchanger, and the liquid reservoir in the casing of the intermediate heat exchanger is A high-pressure refrigerant delivery port is formed in the surrounding wall portion to send out a liquid-phase high-pressure refrigerant obtained by separation into a gas-liquid two-phase in a liquid reservoir toward an expansion valve. Is disposed in the low-pressure refrigerant passage of the casing, one end of the high-pressure refrigerant flow pipe is communicated with the liquid reservoir through the high-pressure refrigerant inlet, and the other end is formed in a wall portion surrounding the low-pressure refrigerant passage in the casing. An air conditioner connected to the outside of the casing through the communication port .
中間熱交換器が、内部に、エバポレータから流出した低圧冷媒が流れる低圧冷媒通路、低圧冷媒通路と一体化するように設けられ、かつコンデンサから流出するとともに膨張弁により減圧される前の高圧の冷媒を貯留して液相と気相とに分離する液溜、および低圧冷媒通路内に配置されかつ高圧冷媒が流れる高圧冷媒流通管を備えており、低圧冷媒通路内を流れる低圧冷媒と、高圧冷媒流通管内を流れる高圧冷媒とが熱交換をするようになされており、
中間熱交換器の低圧冷媒通路および液溜が、１つのケーシング内が隔壁により区画されることによって、横方向に並んで設けられ、中間熱交換器のケーシングにおける低圧冷媒通路を囲む壁部分に、エバポレータから流出した低圧の冷媒を低圧冷媒通路に導入する低圧冷媒導入口、および低圧冷媒通路を通過した低圧冷媒を圧縮機に向けて送り出す低圧冷媒送出口が形成され、中間熱交換器のケーシングにおける液溜を囲む壁部分に、コンデンサから送り出された高圧の冷媒を液溜に導入する高圧冷媒導入口が形成され、中間熱交換器のケーシング内の隔壁に、液溜において気液２相に分離されて得られた液相の高圧冷媒を膨張弁に向けて送り出す高圧冷媒送出口が形成され、高圧冷媒流通管が、ケーシングの低圧冷媒通路内に配置され、高圧冷媒流通管の一端が高圧冷媒送出口を介して液溜内に通じさせられ、同じく他端がケーシングにおける低圧冷媒通路を囲む壁部分に形成された連通口を介してケーシングの外部に通じさせられている空調装置。 A compressor, a condenser for cooling the refrigerant compressed by the compressor, an expansion valve having a high-pressure refrigerant flow path and a low-pressure refrigerant flow path for depressurizing the high-pressure refrigerant cooled by the condenser, and a decompressed refrigerant An evaporator to be evaporated, an intermediate heat exchanger for exchanging heat between the high-pressure refrigerant flowing out of the condenser and the low-pressure refrigerant flowing out of the evaporator, and the expansion valve has a first refrigerant flow path through which the refrigerant flowing out of the evaporator passes and In the air conditioner having the second refrigerant flow path through which the refrigerant before flowing out from the intermediate heat exchanger and flowing into the evaporator passes,
The intermediate heat exchanger is provided so as to be integrated with the low-pressure refrigerant passage and the low-pressure refrigerant passage through which the low-pressure refrigerant that has flowed out of the evaporator flows, and the high-pressure refrigerant that flows out of the condenser and is decompressed by the expansion valve And a high-pressure refrigerant flow pipe that is disposed in the low-pressure refrigerant passage and through which the high-pressure refrigerant flows, and the high-pressure refrigerant and the high-pressure refrigerant flowing in the low-pressure refrigerant passage It is designed to exchange heat with the high-pressure refrigerant flowing in the distribution pipe.
A low-pressure refrigerant passage and a liquid reservoir of the intermediate heat exchanger are provided side by side by dividing the inside of one casing by a partition wall, and a wall portion surrounding the low-pressure refrigerant passage in the casing of the intermediate heat exchanger A low-pressure refrigerant inlet that introduces low-pressure refrigerant that has flowed out of the evaporator into the low-pressure refrigerant passage, and a low-pressure refrigerant outlet that sends out the low-pressure refrigerant that has passed through the low-pressure refrigerant passage toward the compressor are formed in the casing of the intermediate heat exchanger. A high-pressure refrigerant inlet for introducing the high-pressure refrigerant sent from the condenser into the liquid reservoir is formed in the wall portion surrounding the liquid reservoir, and is separated into a gas-liquid two-phase in the liquid reservoir in the partition wall in the casing of the intermediate heat exchanger. A high-pressure refrigerant delivery port for delivering the liquid-phase high-pressure refrigerant thus obtained toward the expansion valve is formed, and the high-pressure refrigerant circulation pipe is disposed in the low-pressure refrigerant passage of the casing. One end of the refrigerant circulation pipe is communicated with the inside of the liquid reservoir through the high-pressure refrigerant delivery port, and the other end is also communicated with the outside of the casing through the communication port formed in the wall portion surrounding the low-pressure refrigerant passage in the casing. and it has air-conditioning system.
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