JP2006162176A - Heat exchanger and vehicular air conditioner - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a heat exchanger and a vehicular air conditioner capable of reducing the size and weight of a device. <P>SOLUTION: This heat exchanger is characterized by having a first heat exchange means 32 for exchanging heat between cooling water and air for cooling a vehicular driving device, and a second heat exchange means 36 for exchanging heat between the cooling water of exchanging heat by this first heat exchange means 32 and a high temperature-high pressure refrigerant delivered from a compressor. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a heat exchanger and a vehicle air conditioner.

One of the heat exchangers used in vehicle air conditioners is refrigerant cooling water heat exchange that exchanges heat between the high-temperature and high-pressure refrigerant compressed by the refrigerant compressor and the hot water led to the hot water heater core. There is what is called a container (for example, refer to Patent Document 1).
JP-A-8-216655

  However, in a vehicle equipped with a water-cooled engine, engine cooling water cooled by a separately installed radiator is supplied as warm water to the refrigerant cooling water heat exchanger, so that the entire apparatus is There was a problem that the size would increase.

  The present invention has been made in view of the above circumstances, and an object thereof is to provide a heat exchanger and a vehicle air conditioner that can reduce the size and weight of the apparatus.

The present invention employs the following means in order to solve the above problems.
The heat exchanger according to the present invention includes a first heat exchanging means for exchanging heat between the cooling water for cooling the vehicle drive device and air, and the cooling water heat-exchanged by the first heat exchanging means. And a high-temperature and high-pressure refrigerant discharged from the compressor, second heat exchange means for performing heat exchange is provided.
Such a heat exchanger has a function of performing heat exchange between cooling water (for example, engine cooling water of a water-cooled engine) and air (or outside air) for cooling a vehicle drive device, and air and heat. Both of the functions of performing heat exchange between the cooling water after replacement and the high-temperature and high-pressure refrigerant discharged from the compressor are provided.
That is, the conventional radiator and refrigerant coolant heat exchanger are integrated, and the apparatus is reduced in size and weight.

The heat exchanger according to claim 2 is characterized in that the second heat exchanging means is accommodated in a cooling water header into which cooling water that has passed through the first heat exchanging means merges.
According to such a heat exchanger, the second heat exchanging means is accommodated in the cooling water header, so that the appearance is such that one part is omitted.

The heat exchanger according to claim 3 is characterized in that the second heat exchange means is arranged along a direction in which the cooling water header is provided.
According to such a heat exchanger, since the second heat exchanging means is provided so as to be parallel along the longitudinal direction of the cooling water header, the heat of the second heat exchanging means and the cooling water. The maximum exchange area can be taken, and the heat exchange capacity can be increased.

The heat exchanger according to claim 4 is configured such that the flow of the cooling water and the flow of the refrigerant in the cooling water header are opposed to each other.
According to such a heat exchanger, since the flow direction of the cooling water flowing in the cooling water header and the flow direction of the refrigerant are opposite to each other, a large temperature difference can be taken.

A vehicle air conditioner according to a fifth aspect comprises the heat exchanger according to any one of the first to fourth aspects.
According to such a vehicle air conditioner, since the heat exchanger includes both the first heat exchange means and the second heat exchange means, the entire apparatus can be reduced in size and weight. it can.

According to the heat exchanger of the present invention, there is an effect that the apparatus can be reduced in size and weight.
Moreover, according to the vehicle air conditioner of the present invention, there is an effect that the entire device can be reduced in size and weight.

Hereinafter, a vehicle air conditioner including a first embodiment of a heat exchanger according to the present invention (hereinafter referred to as “coolant heat exchanger”) will be described with reference to the drawings.
As shown in FIG. 7, the vehicle air conditioner 1 includes a compressor 3 that compresses a refrigerant, an exterior heat exchanger 5, an interior heat exchanger 7, and a first expansion valve 9 as main elements. It is configured.

  The compressor 3 compresses carbon dioxide, which is a refrigerant, and a scroll compressor, for example, is used. A discharge gas temperature sensor 4 is provided on the discharge side of the compressor 3. The refrigerant compressed by the compressor 3 passes through the coolant heat exchanger 10 and is guided to the first three-way valve 12.

As shown in FIGS. 1 and 2, the coolant heat exchanger 10 exchanges heat between engine cooling water of an engine (vehicle drive device) 14 that drives a vehicle and high-temperature and high-pressure refrigerant compressed by the compressor 3. To do.
The coolant heat exchanger 10 is disposed (stacked) between a plurality of cooling water tubes (first heat exchanging means) 32 and between the cooling water tubes 32 and the cooling water tubes 32. One of the fins 33, the cooling water headers 34 disposed at both ends of the cooling water tube 32, and the frame 35 disposed between the cooling water header 34 and the cooling water header 34 (FIG. 1). The main elements are a plurality of refrigerant tubes (second heat exchange means) 36 accommodated in the cooling water header 34 on the right side and refrigerant headers 37 respectively disposed at both ends of the refrigerant tube 36. It is configured as.

  The cooling water tube 32 is an elongated plate-like member made of, for example, an aluminum alloy and formed so that the cross-sectional shape thereof is flat. In the cooling water tube 32, a plurality of fluid passages (not shown) are formed by, for example, extrusion molding along the longitudinal direction (left and right direction in FIG. 1) of the cooling water tube 32. Engine cooling water passes through the inside.

  The fins 33 are thin plate-like members having substantially the same width as the cooling water tube 32, and are formed so that the planar view shape thereof has a waveform as shown in FIG. As for each fin 33, the outer surface of the crest (the end located on the upper side in FIG. 1) abuts on the lower surface of the cooling water tube 32, and the trough (the end located on the lower side in FIG. 1). The outer surface of the cooling water tube 32 is in contact with the upper surface of the cooling water tube 32, and the heat of the cooling water tube 32 can be conducted to the fins 33.

Each cooling water header 34 is provided with a tube insertion hole (not shown) into which one end or the other end of the cooling water tube 32 is inserted, and for the cooling water inserted into the tube insertion hole. One end or the other end of the tube 32 is fixed to each cooling water header 34 by brazing, for example.
The other (left side in FIG. 7) cooling water header 34 is provided with a cooling water introduction pipe 38 that guides the engine cooling water returned from the engine 14 into the cooling water header 34. The cooling water header 34 is provided with engine cooling water introduced into the cooling water header 34 through the fluid passage of the cooling water tube 32 from the cooling water header 34 into the HVAC unit 11 described later. Further, a cooling water outlet pipe 39 that leads to the heater core 16 or the engine 14 is provided.
In other words, the engine cooling water that has flowed into the one cooling water header 34 from the cooling water introduction pipe 38 is guided into the other cooling water header 34 through the fluid passage formed inside each cooling water tube 32. After that, it flows out from the cooling water outlet pipe 39 to the outside.
Further, in a space formed between the cooling water tube 32 and the cooling water tube 32 and between the fins 33 and the fins 33, a direction orthogonal to the flow direction of the engine cooling water passing through the fluid passage ( That is, air (or outside air) is allowed to pass through in the direction orthogonal to the paper surface in FIG. 7, whereby the engine coolant passing through the fluid passage, the coolant tube 32, and the coolant tube 32. And heat exchange with air (or outside air) passing through the space formed between the fin 33 and the fin 33.

  The frame 35 is disposed at each of the upper end and the lower end of the coolant heat exchanger 10, and one end thereof is connected to one cooling water header 34 and the other end is connected to the other cooling water header 34. This prevents the cooling water tubes 32 and the fins 33 from buckling even when a force in the direction in which the cooling water header 34 and the cooling water header 34 approach the coolant heat exchanger 10 is applied. .

As shown in FIG. 2, a plurality of (five in the present embodiment) refrigerant tubes 36 are accommodated in one (right in FIG. 1) cooling water header 34.
Each of the refrigerant tubes 36 is an elongated plate-like member made of, for example, an aluminum alloy and formed so as to have a flat cross-sectional shape. A plurality of fluid passages 36a are formed in the refrigerant tubes 36 along the longitudinal direction (vertical direction in FIG. 1) of the refrigerant tubes 36, for example, by extrusion molding. The refrigerant passes through.
The coolant tubes 36 have engine longitudinal water whose longitudinal direction is parallel to the longitudinal direction of the coolant header 34, and in which the flat surface of the coolant tube 36 passes through the fluid passage of the coolant water tube 32. It is arranged to be parallel to the flow direction.

Each refrigerant header 37 is provided with a tube insertion hole 37a into which one end or the other end of the refrigerant tube 36 is inserted, and the refrigerant tube 36 inserted into the tube insertion hole 37a. One end or the other end is fixed to each refrigerant header 37 by brazing, for example.
The refrigerant header 37 on one side (downward in FIG. 1) is provided with a refrigerant introduction pipe 40 that guides the high-temperature and high-pressure refrigerant sent from the compressor 3 into the refrigerant header 37, and the other (in FIG. 7). The upper refrigerant header 37 has a refrigerant lead-out pipe that guides the refrigerant introduced into the refrigerant header 37 through the fluid passage 36 a of the refrigerant tube 36 from the refrigerant header 37 toward the first three-way valve 12. 41 is provided.
That is, the refrigerant that has flowed into the one refrigerant header 37 from the refrigerant introduction pipe 40 is guided into the other refrigerant header 37 through the fluid passage 36a formed in each refrigerant tube 36, and then the refrigerant is discharged. It flows out from the pipe 41 to the outside.
Further, engine cooling water is allowed to pass outside these refrigerant tubes 36, so that between the refrigerant passing through the fluid passage 36 a and the engine cooling water flowing outside the refrigerant tube 36. Heat exchange is performed.

  The first three-way valve 12 switches the refrigerant flow, and switches to the vehicle exterior heat exchanger 5 side during cooling and to the vehicle interior heat exchanger 7 side during heating. In FIG. 7, the refrigerant flow during cooling is indicated by a dotted line, and the refrigerant flow during heating is indicated by a solid line.

  The vehicle exterior heat exchanger 5 exchanges heat with the outside air, and operates as a radiator during cooling and as an evaporator during heating. A second expansion valve 18 is provided in the refrigerant pipe in the vicinity of the vehicle exterior heat exchanger 5. The second expansion valve 18 is an electronic expansion valve, and is fully opened while being positioned downstream of the vehicle exterior heat exchanger 5 during cooling, and is positioned upstream of the vehicle exterior heat exchanger 5 during heating. In the state, a certain throttle is applied to depressurize the high-pressure refrigerant.

  An internal heat exchanger 20 is provided in the refrigerant pipe between the second expansion valve 18 and the first expansion valve 9. This internal heat exchanger 20 exchanges heat between the high-pressure side refrigerant and the low-pressure refrigerant on the suction side of the compressor 3, and provides supercooling to the high-pressure refrigerant that has passed through the outdoor heat exchanger 5 during cooling. It is used to lower the dryness of the refrigerant at the entrance of the vehicle interior heat exchanger 7.

  The first expansion valve 9 is provided in a refrigerant pipe in the vicinity of the vehicle interior heat exchanger 7, and when it is cooled, the high pressure refrigerant is squeezed and depressurized to be a low pressure refrigerant while being located upstream of the vehicle interior heat exchanger 7. It is. The 1st expansion valve 9 is fully opened in the state located in the downstream of the vehicle interior heat exchanger 7 at the time of heating.

The vehicle interior heat exchanger 7 is provided in an HVAC (Heating, Ventilating and Air-Conditioning) unit 11 and operates as an evaporator during cooling and as a radiator during heating.
A temperature sensor 22 is provided in the vicinity of the vehicle interior heat exchanger 7 and in the refrigerant piping that is on the refrigerant inlet side during heating, that is, the refrigerant piping that connects the first three-way valve 12 and the vehicle interior heat exchanger 7. Yes.

  The HVAC unit 11 provided with the vehicle interior heat exchanger 7 and the heater core 16 adjusts the temperature of the air (outside air or vehicle interior air) supplied to the vehicle interior, and from the upstream side (left side in the figure). The blower 24, the vehicle interior heat exchanger 7 and the heater core 16 are sequentially provided. An air mix damper 26 is provided on the upstream side of the heater core 16. By adjusting the opening degree of the air mix damper 26, the flow rate of the cold air that has passed through the vehicle interior heat exchanger 7 flows through the heater core 16.

An accumulator 28 is provided on the suction side of the compressor 3 and on the upstream side of the internal heat exchanger 20. The accumulator 28 separates the liquid component contained in the refrigerant.
A second three-way valve 30 is provided between the accumulator 28 and the vehicle interior heat exchanger 7. The second three-way valve 30 connects the vehicle interior heat exchanger 7 and the internal heat exchanger 20 during cooling, and connects the accumulator 28 and the vehicle exterior heat exchanger 5 during heating.

  The rotation frequency of the compressor 3, the switching of the three-way valves 12 and 30, the opening adjustment of the expansion valves 9 and 18, etc. are performed by a control unit (not shown) based on the measured values of the temperature sensors 4 and 22.

The vehicle air conditioner 1 configured as described above operates as follows.
During cooling (see the dotted line in FIG. 7), the refrigerant compressed by the compressor 3 is cooled by the coolant heat exchanger 10, and then flows through the first three-way valve 12 to the vehicle exterior heat exchanger 5. . The compressed refrigerant is in a supercritical state because carbon dioxide is used as the refrigerant.
In the vehicle exterior heat exchanger 5, heat is exchanged with the outside air, and the high-pressure refrigerant is cooled. That is, the vehicle exterior heat exchanger 5 operates as a radiator.
The high-pressure refrigerant radiated by the heat exchanger 5 outside the passenger compartment passes through the fully opened second expansion valve 18 and is led to the internal heat exchanger 20. In the internal heat exchanger 20, heat is exchanged with the low-pressure refrigerant on the suction side of the compressor 3, and the high-pressure refrigerant is supercooled.
The high-pressure refrigerant that has passed through the internal heat exchanger 20 is throttled and depressurized by the first expansion valve 9. The refrigerant decompressed by the first expansion valve 9 becomes a low-pressure refrigerant and is led to the vehicle interior heat exchanger 7.
In the vehicle interior heat exchanger 7, heat exchange is performed between the air (outside air or vehicle interior air) guided from the blower 24 and the low-pressure refrigerant, and the low-pressure refrigerant evaporates. That is, the vehicle interior heat exchanger 7 operates as an evaporator. The amount of heat is deprived by the latent heat of vaporization of the liquid refrigerant, and the air is cooled and guided to the downstream heater core 16.
The refrigerant evaporated in the vehicle interior heat exchanger 7 becomes a low-pressure gas refrigerant, and is guided to the accumulator 28 through the second three-way valve 30. The liquid component of the low-pressure gas refrigerant is separated from the high-pressure refrigerant by the internal heat exchanger 20 after the liquid components are separated by the accumulator 28 and led to the suction side of the compressor 3.

  In the HVAC unit 11, air (outside air or vehicle interior air) introduced from the blower 24 is cooled by the vehicle interior heat exchanger 7, and then warmed by the heater core 16 into which engine cooling water is introduced, and guided to the vehicle interior. It is burned. Cooling water that has cooled the discharge gas from the compressor 3 is guided to the heater core 16, and the amount of heat taken from the discharge gas can be effectively recovered by the heater core 16. The amount of heating given to the air by the heater core 16 is adjusted by the air mix damper 26.

During heating (see the solid line in FIG. 7), the refrigerant compressed by the compressor 3 is cooled by the coolant heat exchanger 10, passes through the first three-way valve 12, and is led to the vehicle interior heat exchanger 7. It is burned. The compressed refrigerant is in a supercritical state because carbon dioxide is used as the refrigerant.
In the vehicle interior heat exchanger 7, heat is exchanged between the air introduced from the blower 24 and the high-pressure refrigerant to warm the air. That is, the vehicle interior heat exchanger 7 operates as a radiator.
The high-pressure refrigerant radiated by the vehicle interior heat exchanger 7 is guided to the internal heat exchanger 20 through the fully opened first expansion valve.
In the internal heat exchanger 20, the high-pressure refrigerant is cooled by exchanging heat with the low-pressure refrigerant on the suction side of the compressor 3.
The high-pressure refrigerant that has passed through the internal heat exchanger 20 is throttled and depressurized by the second expansion valve 18, becomes low-pressure refrigerant, and is led to the vehicle exterior heat exchanger 5. The exterior heat exchanger 5 exchanges heat with the outside air and evaporates the low-pressure refrigerant. That is, the vehicle exterior heat exchanger 5 operates as an evaporator.
The low-pressure gas refrigerant vaporized in the vehicle exterior heat exchanger 5 passes through the second three-way valve 30, and after the liquid component is separated by the accumulator 28, it takes heat from the high-pressure refrigerant in the internal heat exchanger 20, and is sucked into the compressor 3. Guided to the side.

  In the HVAC unit 11, the air (outside air or vehicle interior air) introduced from the blower 24 is heated by the vehicle interior heat exchanger 7, and then further heated by the heater core 16 into which engine cooling water is introduced, into the vehicle interior. Led. Cooling water that has cooled the discharge gas from the compressor 3 is guided to the heater core 16, and the amount of heat taken from the discharge gas can be effectively recovered by the heater core 16. The amount of heating given to the air by the heater core 16 is adjusted by the air mix damper 26.

According to the coolant heat exchanger 10 according to the present embodiment, the so-called conventional radiator and the coolant cooling water heat exchanger are integrated, that is, the coolant tube 36 is accommodated in the coolant header 34. Therefore, the apparatus can be reduced in size and weight.
Moreover, since the refrigerant | coolant tube 36 is provided so that it may become parallel along the longitudinal direction of the cooling water header 34, a heat exchange area can be taken as much as possible and the heat exchange capability will be increased. Can do.
Further, since the flat surface of the refrigerant tube 36 is arranged so as to be parallel to the flow direction of the engine cooling water passing through the fluid passage of the cooling water tube 32, the coolant passage 36 is separated from the fluid passage of the cooling water tube 32. The engine cooling water flowing into the cooling water header 34 smoothly flows between the refrigerant tube 36 and the refrigerant tube 36, and the pressure loss of the engine cooling water can be minimized.
Furthermore, the flow of the refrigerant flowing in the fluid passage 36 a of the refrigerant tube 36 and the flow of the engine cooling water flowing in the cooling water header 34 that accommodates the refrigerant tube 36 are configured to face each other. Therefore, a large temperature difference can be taken.
Furthermore, according to the vehicle air conditioner 1 having such a heat exchanger 10, the entire apparatus can be reduced in size and weight.

A second embodiment of the coolant heat exchanger according to the present invention will be described with reference to FIG.
In the coolant heat exchanger according to the present embodiment, the flat surface of the refrigerant tube 36 accommodated in the cooling water header 34 is orthogonal to the flow direction of the engine cooling water passing through the fluid passage of the cooling water tube 32. It differs from the thing of 1st Embodiment mentioned above by the point arrange | positioned. Since other components are the same as those of the first embodiment described above, description of these components is omitted here.
In addition, the same code | symbol is attached | subjected to the member same as 1st Embodiment mentioned above.

  That is, in the present embodiment, the engine cooling water flowing out from the fluid passage of the cooling water tube 32 into the cooling water header 34 is the flat surface of the refrigerant tube 36 located on the innermost side (the leftmost side in FIG. 3). The refrigerant tube 36 located on the innermost side is arranged so as to collide with the other, and the other (remaining four) refrigerant tubes 36 are parallel to the refrigerant tube 36 located on the innermost side. It is arranged to be.

According to the coolant heat exchanger according to the present embodiment, the so-called conventional radiator and the coolant cooling water heat exchanger are integrated, that is, the coolant tube 36 is accommodated in the coolant header 34. Therefore, the device can be reduced in size and weight.
Moreover, since the refrigerant | coolant tube 36 is provided so that it may become parallel along the longitudinal direction of the cooling water header 34, a heat exchange area can be taken as much as possible and the heat exchange capability will be increased. Can do.
Further, since the refrigerant flow that flows in the fluid passage 36a of the refrigerant tube 36 and the engine cooling water flow that flows in the cooling water header 34 that accommodates the refrigerant tube 36 are configured to face each other. A large temperature difference can be taken.

A third embodiment of the coolant heat exchanger according to the present invention will be described with reference to FIG.
The coolant heat exchanger in the present embodiment is different from that in the above-described embodiment in that a plurality of slits 136 a are provided in the refrigerant tube 136. Since other components are the same as those in the above-described embodiment, description of these components is omitted here.
The same members as those in the above-described embodiment are denoted by the same reference numerals, and the drawings are simplified for easy understanding.

  As shown in FIG. 4, the refrigerant tube 136 according to the present embodiment has a slit (elongated cut) penetrating the refrigerant tube 136 in the thickness direction (a direction parallel to the short side in the cross section). Then, a total of six fluid passages 36a and one fluid passage 36a are provided, one each. These slits 136a are formed by punching, for example.

According to the coolant heat exchanger having such a refrigerant tube 136, the engine cooling water enters each slit 136a, and the contact area between the refrigerant tube 136 and the engine cooling water, that is, the heat transfer area. Therefore, the heat transfer efficiency can be increased.
Further, when the refrigerant tube 136 is arranged as shown in FIG. 3, the engine coolant flowing out from the fluid passage of the coolant tube 32 into the coolant header 34 smoothly flows into the slits 136a. Therefore, the pressure loss of engine cooling water can be reduced.
Since other operational effects are the same as those of the above-described embodiment, the description thereof is omitted here.

A fourth embodiment of the coolant heat exchanger according to the present invention will be described with reference to FIG.
The coolant heat exchanger in the present embodiment is different from that in the third embodiment described above in that a plurality of refrigerant tubes 136 described in the third embodiment are arranged in close contact with each other. Since other components are the same as those in the above-described embodiment, description of these components is omitted here.
The same members as those in the above-described embodiment are denoted by the same reference numerals, and the drawings are simplified for easy understanding.

  As shown in FIG. 5, in the coolant heat exchanger according to the present embodiment, a plurality of (three in the present embodiment) refrigerant tubes 136 are formed so that the slits 136 a formed in the refrigerant tubes 136 are mutually connected. They are in close contact with each other so as to form six slits.

According to the coolant heat exchanger having such a refrigerant tube 136, the plurality of refrigerant tubes 136 are configured to be in close contact with each other, so that assemblability can be improved. Productivity can be improved.
Since other operational effects are the same as those of the above-described embodiment, the description thereof is omitted here.

5th Embodiment of the coolant heat exchanger by this invention is described using FIG.
In the coolant heat exchanger according to the present embodiment, the refrigerant tubes 136 described in the third embodiment and a plurality of refrigerant tubes 236 similar to the refrigerant tubes 136 are alternately arranged in close contact with each other. This is different from that of the fourth embodiment described above. Since other components are the same as those in the above-described embodiment, description of these components is omitted here.
The same members as those in the above-described embodiment are denoted by the same reference numerals, and the drawings are simplified for easy understanding.

As shown in FIG. 6, in the coolant heat exchanger according to this embodiment, a plurality of refrigerant tubes 136 and refrigerant tubes 236 are alternately brought into close contact with each other (two in this embodiment).
The refrigerant tube 236 has a fluid passage 36a formed in a portion where the slit 136a of the refrigerant tube 136 is located. When the refrigerant tube 136 and the refrigerant tube 236 are alternately combined, the fluid passage 36a is formed. 36a is arranged in a staggered manner.

According to the coolant heat exchanger having such refrigerant tubes 136 and 236, since the plurality of refrigerant tubes 136 and 236 are configured to be in close contact with each other, the assemblability is improved. Can improve productivity.
Further, the engine cooling water that has passed through each slit 136a is made to collide with the wall portion of the fluid passage 36a of the refrigerant tube disposed adjacent thereto, and the contact between the refrigerant tubes 136 and 236 and the engine cooling water. Since the area, that is, the heat transfer area is increased, the heat transfer efficiency can be increased.
Since other operational effects are the same as those of the above-described embodiment, the description thereof is omitted here.
As mentioned above, although preferable embodiment of this invention was described, a various change can be added to embodiment mentioned above. In particular, in the above-described embodiment, the vehicle air conditioner of the present invention is mounted on a vehicle driven by an engine. However, the vehicle air conditioner of the present invention can be applied to any vehicle such as an electric vehicle driven by a motor. The device can be installed.

It is a schematic front view which shows 1st Embodiment of the heat exchanger by this invention. It is a principal part disassembled perspective view of FIG. It is a principal part disassembled perspective view which shows 2nd Embodiment of the heat exchanger by this invention. It is a principal part perspective view which shows 3rd Embodiment of the heat exchanger by this invention. It is a principal part perspective view which shows 4th Embodiment of the heat exchanger by this invention. It is a figure which shows 5th Embodiment of the heat exchanger by this invention, Comprising: (a) is a principal part perspective view, (b) is a cross-sectional view of (a). It is a schematic block diagram of the vehicle air conditioner which comprises 1st Embodiment of the heat exchanger by this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Vehicle air conditioner 3 Compressor 10 Coolant heat exchanger 32 Cooling water tube (first heat exchange means)
34 Cooling water header 36 Refrigerant tube (second heat exchange means)
136 Refrigerant tube (second heat exchange means)
236 Refrigerant tube (second heat exchange means)

Claims (5)

  First heat exchanging means for exchanging heat between the cooling water for cooling the vehicle drive device and the air, and the high temperature discharged from the compressor and the cooling water heat exchanged by the first heat exchanging means A heat exchanger comprising second heat exchanging means for exchanging heat with a high-pressure refrigerant.   2. The heat exchanger according to claim 1, wherein the second heat exchanging means is accommodated in a cooling water header into which cooling water that has passed through the first heat exchanging means merges.   The heat exchanger according to claim 2, wherein the second heat exchange means is disposed along a direction in which the cooling water header is provided.   The heat exchanger according to claim 3, wherein the cooling water flow and the refrigerant flow in the cooling water header are configured to face each other.   A vehicle air conditioner comprising the heat exchanger according to any one of claims 1 to 4.

Images