WO2001004560A1 - Heat exchanger - Google Patents

Abstract

A stacked heat exchanger having a refrigerant inlet and a refrigerant outlet on its one end side in stacking direction in order to obtain a heat exchanger which is excellent in heat exchanger temperature distribution and high in heat exchanger capability even in a thinned heat exchanger, wherein a communication path is provided to connect one end of a refrigerant flow-in path communicating with the refrigerant inlet to a tank part located at the other end of a first tank group in stacking direction and one end of a refrigerant flow-out path communicating with the refrigerant outlet is communicated directly with the tank part located on one end side of a second tank group in stacking direction, the refrigerant inlet is provided generally at the center of the first tank group, a communication path is provided to connect the refrigerant inlet to the tank part located at both ends of the first tank group in stacking direction, and the refrigerant outlet is provided at the tank part positioned generally at the center of the second tank group in stacking direction so that the refrigerant outlet is positioned in parallel with the refrigerant inlet and the refrigerant inlet and outlet can be communicated directly with each other.

Description

 Akira Fine heat exchanger technical field

 The present invention relates to a heat exchanger used for a vehicle air conditioner. Background art

 Japanese Utility Model Laid-Open No. 7-127778 discloses a pair of upper and lower headers formed at one end in the longitudinal direction, and a pair of lower front and rear headers formed at the other end in the longitudinal direction. Stacked heat exchanger formed by laminating, via fins, an intermediate plate having the upper front and rear header portions and a flat tube portion communicating each of the lower front and rear header portions. A vessel is disclosed. In this stacked heat exchanger, the pair of upper and lower ink tanks formed by stacking the upper and lower headers is cut off at a substantially central portion and each is divided into two tank blocks. Further, the lower front and rear header portions are laminated to form a pair of lower ink groups.

Then, the divided tank blocks of the upper tank group are divided into a first upper front tank block, a second upper front tank block, a first upper rear tank block, and a second upper rear tank block. In the stacked heat exchanger described above, the refrigerant enters the first upper front tank block from the fluid inlet, descends the flat tube section, enters the lower front tank group, and enters the lower front tank group. The flat tube section rises from the front tank group and enters the second upper front tank block. Then, the refrigerant bypasses the communication portion 21 and enters the second upper and lower tank block, descends from the second upper and lower tank block through the flat tube portion, and enters the lower and rear tank group. Then, the lower rear tank group moves, the flat tube rises, flows into the first upper rear tank block, Outflows.

 However, in the heat exchanger having the configuration of the above-mentioned reference, the refrigerant flowing into the first upper front evening block flows down the flat tube section, flows into the lower front evening group, and flows into the lower front tank group. To move up the flat tube part to reach the second upper front side ink block, but the amount of refrigerant rising in the flat tube part located near the partition is smaller than in other parts. The nearby refrigerant temperature rises. Similarly, the refrigerant descends from the second upper rear tank block to the lower rear tank group, moves through the lower rear tank group, and rises to the first upper rear tank block. Also in this case, the amount of refrigerant rising in the flat tube portion located near the partition is smaller than in other portions, so that the temperature in the vicinity increases.

 As described above, since the amount of the refrigerant decreases near the partition and the temperature rises, there is a problem that the temperature distribution near the center of the heat exchanger, where the ventilation amount is most stable, extremely deteriorates. In particular, since the size of the air conditioner is required to be reduced due to the space saving inside the vehicle, the demand for downsizing of the heat exchanger itself is increasing. Deterioration of the temperature distribution in the vicinity of the part is a serious problem because it means an extreme decrease in heat exchange capacity. In addition, when the width is reduced, the passage resistance increases.

 Therefore, an object of the present invention is to provide a heat exchanger which does not have a high passage resistance even in a thinned heat exchanger, has a good temperature distribution of the heat exchanger, and has a high heat exchanger capacity. Disclosure of the invention

Accordingly, the present invention provides a plurality of tube portions having a pair of tank portions formed at one longitudinal end and extending near the other end in the longitudinal direction to be folded and having a refrigerant flow path fluidly communicating the pair of ink portions. A heat exchanger comprising at least a plurality of elements, a plurality of fins alternately stacked with the plurality of tube elements, and a pair of end plates provided at both ends in the stacking direction. A first evening group formed by connecting the ink portions in the laminating direction, a second evening group formed by communicating the other evening portions in the laminating direction, and a lamination of the heat exchanger. A refrigerant inlet provided at an end plate disposed at one end in the direction, and a refrigerant inflow passage formed in the one end plate; A communication passage communicating with the ink tank located near the end and a tank portion located at one end of the second tank group through a refrigerant outflow passage formed in the one end plate. And a refrigerant outlet portion.

 Therefore, according to the present invention, in the laminated heat exchanger having the refrigerant inlet and the refrigerant outlet at one end in the stacking direction, one end of the refrigerant inflow passage communicating with the refrigerant inlet and the first tank group are provided. A communication path connecting the tank at the other end in the stacking direction was provided, and one end of the refrigerant outflow passage communicating with the refrigerant outlet was directly connected to the tank at one end in the stacking direction of the second tank group. The refrigerant that has passed through the refrigerant inflow passage from the inlet portion can flow into the first tank group from the other end in the stacking direction through the communication passage, whereby the refrigerant flows from the first evening group into the refrigerant flow path. A first path that rises and a second path in which the refrigerant descends through the refrigerant flow path toward the second tank group are formed. The amount of refrigerant flowing to the center can be secured with a simple structure, Those capable of the temperature distribution well.

Further, in the present invention, the communication passage may include a communication pipe having one end connected to the refrigerant inflow passage, and a sunset located at the other end of the communication pipe and the other end of the first sunset group. It is desirable to be constituted by a turn-back path communicating with the section. By this, it passes through the communication pipe As a result, the refrigerant flows into the first tank group after passing through the return passage, so that the momentum of the refrigerant flowing into the first tank group is impeded, so that the refrigerant flows into the refrigerant passage from the first tank group. There is no difference in the amount of refrigerant between the near side and the back side of the first evening group in the refrigerant inflow direction, and a uniform temperature distribution can be obtained.

 Further, the present invention provides a plurality of tank portions formed at one end in the longitudinal direction, and a plurality of refrigerant passages extending to near the other end in the longitudinal direction and being folded, and having a refrigerant flow path fluidly communicating the pair of tank portions. In a heat exchanger including at least a tube element, fins alternately stacked with the plurality of tube elements, and a pair of end plates provided at both ends in the stacking direction, the one of the heat exchangers A first evening group formed by connecting the ink portions in the stacking direction, a second evening group formed by connecting the other evening portions in the stacking direction, and the first tank group. A refrigerant inlet portion provided substantially outside the evening portion, a communication passage communicating the coolant inlet portion with the evening portions located near both ends of the first evening group, and the second passage; The refrigerant inlet at approximately the center of the evening group And a refrigerant outlet directly communicated with an ink tank located substantially at the center of the second tank group.

Therefore, according to the present invention, in the laminated heat exchanger, the refrigerant inlet is provided substantially at the center of the first tank group, and the refrigerant inlet and the first tank group are located at both ends in the laminating direction of the first tank group. A communication passage for connecting to the ink tank is provided, and a refrigerant outlet is provided in the tank located substantially at the center in the stacking direction of the second tank group so as to be juxtaposed with the refrigerant inlet, and these are directly connected to each other. As a result, the refrigerant flowing from the refrigerant inlet can flow into the first group through both ends in the stacking direction through the communication path, and the refrigerant rises up the refrigerant flow path from the first group. A first path and a second path in which the refrigerant descends through the refrigerant flow path toward the second tank group are formed. As a result, the flow of the refrigerant in the central portion of the heat exchanger is better than in the conventional four-pass case, so that the temperature distribution of the heat exchanger can be improved.

 Further, in the present invention, the communication passage extends from each of a pair of distribution pipes having one end connected to the refrigerant inflow passage, and an ink tank located near both ends of the first tank group, It is preferable that the distributing pipe be constituted by an enlarged ink portion communicating with the other end of each of the distribution pipes. As a result, when the refrigerant that has passed through the distribution pipe flows into the first tank group, its direction is returned, so that the inflow speed is limited, and the refrigerant flowing from the first tank group into the refrigerant flow path Since the amount can be made uniform in each part, the temperature distribution can be made uniform.

 Further, it is preferable that the communication pipe or the distribution pipe is disposed between a pair of tank portions. This is because the concave portion formed between the pair of ink portions can be used as it is as the mounting groove portion.

 Further, the communication pipe or the distribution pipe may be arranged outside a pair of the ink portions. Accordingly, it is possible to cope with a case where a space for mounting a communication pipe or the like cannot be secured between the pair of evening portions.

 Furthermore, the communication pipe or the distribution pipe may penetrate the inside of the first sunset group. As a result, it is possible to cope with a case where a space for mounting cannot be secured even between the pair of sunset portions and a space for mounting outside the heat exchanger cannot be secured due to space saving.

Further, it is desirable that the width of the heat exchanger in the ventilation direction is approximately 30 mm or more and 57 mm or less. By forming the heat exchanger having the above configuration within this range, it is possible to maintain a heat exchanger capacity of a predetermined level or more. BRIEF DESCRIPTION OF THE FIGURES

FIG. 1 is a front view of the laminated heat exchanger according to the first embodiment of the present invention, and FIG. 2 is a front view of the laminated heat exchanger according to the first embodiment of the present invention. FIG. 3 (a) is a left side view of the laminated heat exchanger according to the first embodiment of the present invention, and FIG. 3 (b) is a right side view thereof. Yes, FIG. 4 is a schematic diagram illustrating the flow of the refrigerant in the laminated heat exchanger according to the first embodiment of the present invention, and FIG. 5 is a schematic view of the second embodiment of the present invention. FIG. 6 is a front view of the stacked heat exchanger, and FIG. 6 is a bottom view of the stacked heat exchanger according to the second embodiment of the present invention. FIG. 7 is a left side view of the stacked heat exchanger according to the second embodiment, (b) of FIG. 7 is a right side view thereof, and FIG. 8 is a second embodiment of the present invention. Such a stacked heat exchanger FIG. 9 is a schematic diagram illustrating the flow of the refrigerant, FIG. 9 is a front view of a laminated heat exchanger according to a third embodiment of the present invention, and FIG. Fig. 11 is a bottom view of the stacked heat exchanger according to the embodiment of the present invention, and Fig. 11 (a) is a left side view of the stacked heat exchanger according to the third embodiment of the present invention. (B) of FIG. 11 is a right side view thereof, and FIG. 12 is a schematic diagram illustrating the flow of the refrigerant in the laminated heat exchanger according to the third embodiment of the present invention. FIG. 13 is a front view of a laminated heat exchanger according to a fourth embodiment of the present invention, and FIG. 14 is a laminated heat exchanger according to the fourth embodiment of the present invention. FIG. 15 (a) is a bottom view of the heat exchanger, and FIG. 15 (a) is a left side view of the laminated heat exchanger according to the fourth embodiment of the present invention, and FIG. 15 (b) is FIG. FIG. 6 is a schematic diagram illustrating the flow of a refrigerant in a laminated heat exchanger according to a fourth embodiment of the present invention. FIG. 17 is a schematic diagram illustrating a laminated heat exchanger according to a fifth embodiment of the present invention. FIG. 18 is a bottom view of a laminated heat exchanger according to a fifth embodiment of the present invention, and FIG. 19 (a) is a view of the present invention. number 5 FIG. 19 is a left side view of the laminated heat exchanger according to the embodiment of FIG. 19, (b) of FIG. 19 is a right side view thereof, and FIG. 20 is a fifth embodiment of the present invention. FIG. 21 is a schematic diagram illustrating the flow of the refrigerant in the stacked heat exchanger, and FIG. 21 is a front view of the stacked heat exchanger according to the sixth embodiment of the present invention; FIG. FIG. 23 is a bottom view of the stacked heat exchanger according to the sixth embodiment of the present invention. FIG. 23 (a) is a sectional view of the stacked heat exchanger according to the sixth embodiment of the present invention. FIG. 23 (b) is a right side view of the left side view, and FIG. 24 is a view showing the flow of the refrigerant in the laminated heat exchanger according to the sixth embodiment of the present invention. FIG. 25 is a schematic view for explaining, FIG. 25 is a front view of a laminated heat exchanger according to a seventh embodiment of the present invention, and FIG. 26 is a seventh embodiment of the present invention. Laminated heat exchange FIG. 27 (a) is a left side view of the laminated heat exchanger according to the seventh embodiment of the present invention, and FIG. 27 (b) is the bottom view. FIG. 28 is a right side view, FIG. 28 is a schematic diagram illustrating the flow of the refrigerant in the laminated heat exchanger according to the seventh embodiment of the present invention, and FIG. FIG. 30 is a front view of the laminated heat exchanger according to the eighth embodiment, and FIG. 30 is a bottom view of the laminated heat exchanger according to the eighth embodiment of the present invention. (A) of the figure is a left side view of the laminated heat exchanger according to the eighth embodiment of the present invention, (b) of FIG. 31 is a right side view thereof, and FIG. And FIG. 33 is a schematic diagram illustrating the flow of the refrigerant in the stacked heat exchanger according to the eighth embodiment of the present invention. FIG. 33 is a graph showing the relationship between the width of the heat exchanger in the ventilation direction and the heat exchanger capacity. In the characteristic diagram showing the relationship is there. BEST MODE FOR CARRYING OUT THE INVENTION

 Hereinafter, embodiments of the present invention will be described with reference to the drawings.

FIGS. 1 to 4 show a laminated heat exchanger 1 according to a first embodiment of the present invention. This laminated heat exchanger 1 is, for example, a vehicle Evaporator mounted on an air conditioner for use in a vehicle, the elongator being formed at one end in the longitudinal direction, a pair of ink portions 2, 3; It has a plurality of tube elements 5 having a refrigerant flow path 4 that fluidly communicates 2 and 3, and is constituted by a plurality of fins 6 alternately stacked with the plurality of tube elements 5.

 Further, in the laminated heat exchanger 1, the pair of tank portions 2 and 3 has a communication hole (not shown) opened in the laminating direction, and one of the tank portions 2 communicated in the laminating direction by the communicating hole. Thus, a first tank group A is formed, and a second tank group B is formed by the other tank portion 3 communicating in the stacking direction.

 In the laminated heat exchanger 1, a pair of end plates 7, 8 are arranged at both ends in the laminating direction. The one end plate 7 is combined with the tube element 5 to form the refrigerant flow path 4. Further, an inlet / outlet passage forming plate 11 that defines a refrigerant inflow passage 9 and a refrigerant outflow passage 10 is fixed to the end plate 7, and further, the refrigerant inflow passage 9 and the refrigerant outflow passage At one end of 10, there is provided a mounting block 12 for mounting and fixing a block type expansion valve (not shown). The mounting block 12 has an inlet pipe section 13 and an outlet pipe section. There are 14 provided.

The other end of the refrigerant inflow passage 9 communicates with one end of a communication pipe 15 arranged between the pair of tanks 2 and 3 of the tube element 5, and the other end of the communication pipe 15 It communicates with a return path 16 integrally formed below the other end plate 8. The turn-back passage 16 communicates with the first tank group A through an opening 18 formed in the end plate 8 held on the other side in the stacking direction. Further, the other end side of the refrigerant outflow passage 10 is connected to the second tank group B through an opening 17 formed below an end plate 配 disposed at one end in the stacking direction. Communicate with

 As a result, the refrigerant that has passed through the refrigerant inflow passage 9 from the inlet pipe portion 13 provided on one side in the stacking direction passes through the return pipe provided on the other side in the stacking direction via the communication pipe 15. It reaches 16 and flows into the first evening group A from the other side in the stacking direction. Since the direction of the refrigerant flow is changed by 180 ° by passing through the return passage 16, the momentum of the refrigerant flowing into the first tank group A is obstructed, and the first tank group A is moved from the first tank group to the first tank group. The amount of the refrigerant flowing into each of the refrigerant flow paths 4 communicating with the group A is substantially equal on the near side in the inflow direction and the back side in the inflow direction of the first ink group A.

 Then, the refrigerant passing through the first path going up the refrigerant flow path 4 from the first sunset group A and the second path going down the refrigerant flow path 4 toward the second tank group B is: Although the heat of the air passing through the fins 6 is absorbed and vaporized via the fins 6, the amount of the refrigerant passing through each of the refrigerant flow paths 4 is substantially uniform, so that the temperature change in each portion becomes constant. In addition, the temperature distribution of the heat exchanger can be made uniform. Then, the vaporized refrigerant is to be discharged from the second tank group B to the next step through the refrigerant outflow passage 10 and the refrigerant outlet pipe portion 14.

 5 to 8, a laminated heat exchanger 20 according to a second embodiment of the present invention is disclosed. Note that, in the embodiment described below, the same reference numerals are given to the same portions or portions having the same effects as those of the stacked heat exchanger 1 according to the first embodiment, and the description thereof will be omitted. Is omitted.

In the laminated heat exchanger 20 according to the second embodiment, the tube element 21 located on the other end side in the laminating direction is such that the tube element 21 is moved from the first tank group A side to the second tank group B side. It has an extended tank portion 22 that extends, and the other end of the communication pipe 15 is configured to communicate with the enlarged ink portion 22. As a result, the expanded tank portion 22 constitutes a turn-back passage 23, and the refrigerant flowing into the expanded tank portion 22 receives the refrigerant from the expanded tank portion 22. After turning 180 ° through the turn-back passage 23 formed in 2 and flowing into the first tank group A, and in the tube element of the expanded tank part, turning 90 ° Since the direction is changed by 90 ° and flows to the tube element, the same effects as in the above-described first embodiment can be obtained.

 9 to 12 show a laminated heat exchanger 40 according to a third embodiment of the present invention. In the laminated heat exchanger 30, the communication pipe 15 is provided outside the heat exchanger. For this reason, the end plates 7 and 8 are formed with extended portions 7a and 8a extending to the downstream side in the ventilation direction, and the end plate 7 enters and exits so as to conform to this shape. An opening passage forming plate 11 is formed, and the refrigerant inflow passage 9 extends outward and communicates with one end of the communication pipe 15. In the other end plate 8, a tank portion 31 located at the other end in the stacking direction, which is closed by the end plate 8, is formed so as to conform to this shape. The other end of 15 communicates.

 Thereby, the refrigerant having passed through the communication pipe 15 flows into the expanded tank portion 31, changes its direction by 180 °, and flows into the first tank group A. As a result, even if the width of the heat exchanger itself in the ventilation direction is small and it is not possible to obtain a sufficient space for arranging the communication pipe 15 between the tank sections 2 and 3, the above-mentioned method can be used. The same effects as in the first and second embodiments can be obtained.

13 to 16 show a laminated heat exchanger 40 according to a fourth embodiment of the present invention. In this stacked heat exchanger 40, the communication pipe 15 penetrates through the inside of the first evening group A and is located at the other end of the first evening group A in the stacking direction. It is extended and distributed. For this reason, the refrigerant inflow passage 9 is different from the first and second embodiments in that the other end side is curved to the first evening group A side. Formed.

 Accordingly, in the fourth embodiment, the refrigerant that has passed through the communication pipe 15 collides with the end plate 8 that closes the tank portion 41 outside the stacking direction of the tank portion 41. As a result, the refrigerant flow direction is changed by 180 °, and since the communication pipe 15 penetrates through the first evening group A, the refrigerant passing through the first evening group A Since the momentum of the flow is obstructed, the amount of the refrigerant passing through the refrigerant passage 4 communicating with the first ink group A can be made uniform, and the same effect as in the above-described embodiment can be obtained. .

 17 to 20 disclose a stacked heat exchanger 50 according to a fifth embodiment. In the laminated heat exchanger 50, the communication pipe 15 is located at the other end of the refrigerant inflow passage 9 and one side before the other side in the laminating direction, and extends toward the second tank group. Communicates with the enlarged tank 51. The enlarged tank portion 51 is different from the enlarged tank portion 52 of the second embodiment in that the enlarged tank portion 52 is located at the outer end on the other side in the stacking direction and has a normal capacity. On the other hand, it is located at the outermost end of the sunken part having a normal volume.

 As a result, the refrigerant that has passed through the communication pipe 15 flows from the expanded tank section 51 into the first evening tank group A, so that the refrigerant that substantially flows through the first tank group A is: Since the direction has been changed by 180 ° with respect to the direction in which the communication pipe 15 flows, the same effect as in the above-described embodiment can be obtained. Here, the communication pipe 15 is located immediately before the other side in the stacking direction, but may be located three or four before as a further embodiment.

21 to 24, a stacked heat exchanger 60 according to a sixth embodiment is disclosed. In the stacked heat exchanger 60, a mounting block 12 'is provided substantially at the center in the laminating direction, and the mounting block 12' is provided in the mounting block 12. The inlet pipe section 13 is directly connected to the distribution pipes 15a and 15b, and the outlet pipe section 14 provided in the mounting block 12 is connected to the second tank group B. It is directly connected to the tanks 3a and 3b located at the approximate center of the. Further, the distribution pipe 15 a communicates with the inlet pipe section 13 and an enlarged tank section 61 provided at a location located on the other end side in the stacking direction, and the distribution pipe 15 b is It communicates with the inlet pipe section 13 and an enlarged tank section 62 provided at a position located on one end side in the stacking direction.

 As a result, from the inlet pipe section 13 'through the distribution pipes 15a and 15b, the expanded tank sections 6 1 and 6 2 at both ends of the first tank group A are expanded to the first tank group. A, flows into the second tank group B via the refrigerant flow path 4, and flows out of the outlet pipe section 14 'in the next stroke. For this reason, in the enlarged sunset sections 61 and 62, the direction of the distribution pipes 15a and 15b is changed by 180 ° to the direction of the distribution pipes and flows into the first sunset group A, and the center Since the refrigerant flows from both sides, the amount of refrigerant in the central part of the heat exchanger can be secured, so that the heat exchanger capacity of the heat exchanger itself can be improved and the amount of refrigerant to each refrigerant flow path 4 can be uniform. Therefore, the temperature distribution can be improved.

FIGS. 25 to 28 show a laminated heat exchanger 70 according to a seventh embodiment of the present invention. In the laminated heat exchanger 70, the distribution pipes 15a and 15b are the same as those in the case of the communication pipe 15 of the laminated heat exchanger 30 according to the third embodiment described above. The heat exchanger is provided on the downstream side of the laminated heat exchanger 70 in the ventilation direction. Along with this, the tank portions located at both ends in the stacking direction are the enlarged tank portions 71, 72 extending in the ventilation direction of the heat exchanger, and the distribution pipes 15a, 15b are: The inlet pipe section 13 and these enlarged tank sections 71 and 72 are connected to it. Thereby, the same effect as in the above-described embodiment can be obtained. 29 to 32, a stacked heat exchanger 80 according to an eighth embodiment of the present invention is disclosed. In the stacked heat exchanger 70, the distribution pipes 15a and 15b are provided so as to penetrate inside the first tank group A, and the inlet pipe section 13 'and the first In this case, the ink tanks A and 8 at the both ends in the stacking direction of the tank group A communicate with each other. Thus, the same effect as in the above-described embodiment can be obtained.

 Further, as shown in FIG. 33, in the configuration of the heat exchanger described above, the heat exchanger capacity F a represented by the refrigerating capacity / the negative resistance is such that the width C w in the ventilation direction of the heat exchanger is 40 °. mm, the maximum capacity could be obtained.However, the range in which the specified capacity or more (for example, 80%) can be obtained is that the width Cw in the ventilation direction of the heat exchanger is approximately 30 mm. More than 57 mm. For this reason, it is desirable to set the width of the heat exchanger in the ventilation direction within this range. Industrial applicability

 As described above, according to the present invention, the tank group has two paths without partitions, and the direction of the refrigerant flowing into the first tank group is changed by 180 ° by the communication pipe. Therefore, the momentum of the refrigerant flowing into the first tank group can be suppressed, and the amount of refrigerant from the ink tank forming the tank group to the refrigerant flow path can be made uniform in each refrigerant flow path. In addition, the passage resistance can be reduced, and the amount of refrigerant flowing in the central part of the heat exchanger can be secured, so that the temperature distribution of the heat exchanger can be improved.

Claims

The scope of the claims 1. A pair of tube elements formed at one end in the longitudinal direction and a plurality of tube elements having a refrigerant flow path extending to the vicinity of the other end in the longitudinal direction and being folded and fluidly communicating the pair of tank parts. And a fin alternately stacked with the plurality of tube elements, and end plates provided at both ends in the stacking direction, wherein the one ink portion is stacked in the stacking direction. A first group of tanks formed in communication with  A second tank group formed by connecting the other tank portion in the stacking direction;  A refrigerant inlet provided on one end bracket disposed at one end in the stacking direction of the heat exchanger;  A communication passage communicating between the refrigerant inlet and a tank located near the other end of the first tank group via a refrigerant inflow passage formed in the one end plate; A heat exchanger, comprising: a refrigerant outlet communicating with a tank located at one end of the second tank group via a refrigerant outlet passage formed in an end plate.  2. The communication path connects a communication pipe having one end connected to the refrigerant inflow path, and a second end of the communication pipe and a sunset portion located at the other end of the first sunset group. 2. The heat exchanger according to claim 1, wherein the heat exchanger is formed by a turn-back passage.  3. The communication passage extends from a communication pipe having one end connected to the refrigerant inflow passage and an ink portion located at the other end of the first ink group, and has another end of the communication pipe. 2. The heat exchanger according to claim 1, wherein the heat exchanger is constituted by an expansion tank portion communicating with the heat exchanger. 4. The communication pipe is disposed between a pair of tank parts. The heat exchanger according to claim 2 or 3, wherein  5. The heat exchanger according to claim 2, wherein the communication pipe is disposed outside a pair of the ink portions.  6. The heat exchanger according to claim 2, wherein the communication pipe penetrates through the inside of the first tank group.  7. A pair of tube elements formed at one end in the longitudinal direction and a plurality of tube elements having a refrigerant flow path extending to the vicinity of the other end in the longitudinal direction and being folded and fluidly communicating the pair of tank parts. And a pair of end plates provided at both ends in the laminating direction of the heat exchanger, the fin being alternately stacked with the plurality of tube elements, and a pair of end plates provided at both ends in the stacking direction.  A first tank group formed by connecting the one ink portion in the stacking direction;  A second tank group formed by connecting the other tank portion in the stacking direction;  A refrigerant inlet provided substantially outside the tank at the center of the first tank group;  A communication passage for communicating the refrigerant inlet with tanks located near both ends of the first tank group;  A coolant outlet is provided substantially at the center of the second tank group and in parallel with the coolant inlet, and is directly communicated with an ink tank located substantially at the center of the second tank group. A heat exchanger, characterized in that:  8. The communication path communicates a communication pipe having one end connected to the refrigerant inflow path, and a second end of the communication pipe and a tank located at the other end of the first group of ink. 8. The heat exchanger according to claim 7, wherein the heat exchanger is constituted by a turnback passage. 9. The communication path is a pair having one end connected to the refrigerant inflow path. A distribution pipe and an enlarged ink section extending from each of the evening water sections located near both ends of the first evening water group and communicating with the other end of each of the distribution pipes. A heat exchanger as set forth in claim 7 characterized by the above-mentioned.  10. The heat exchanger according to claim 7, wherein the distribution pipe is disposed between a pair of tank portions.  11. The heat exchanger according to claim 7, wherein the distribution pipe is disposed outside a pair of tank portions.  12. The heat exchanger according to claim 7 or 9, wherein the distribution pipe penetrates through the inside of the first tank group.  13. The heat exchanger according to any one of claims 1 to 12, wherein the width of the heat exchanger in the ventilation direction is approximately 30 mm or more and 57 mm or less. .