JP6512117B2 - Heat exchange unit - Google Patents

Description

  The present invention relates to a heat exchange unit for cooling a fluid by heat exchange between the fluid and air.

  In recent years, a hybrid vehicle that travels using an output of an electric motor in addition to an output of an engine, and a vehicle in which the displacement of the engine is suppressed by mounting a supercharger have become widespread. Along with such diversification of vehicles, it is also necessary to cool not only the engine but also the electric motor, the electric control circuit for supplying electric power to the electric motor, the turbocharger and the like. It is general to circulate cooling water and to perform such cooling of on-vehicle equipment.

  For example, cooling water used to cool the engine is supplied to the radiator after receiving heat from the engine. The radiator cools the coolant by heat exchange between the hot coolant and the air. Cooling water that has been cooled and has a reduced temperature is again supplied to the engine.

  Patent Document 1 below describes a radiator that cools two cooling waters that are different in the object to be cooled. Specifically, the radiator has a first radiator for cooling engine cooling water received from the engine, and a second radiator for cooling electric system cooling water received from the electric motor and the electric control circuit. The engine cooling water and the electrical system cooling water are cooled by heat exchange with air while flowing through the flow paths in the plurality of tubes of the first radiator and the second radiator, respectively. One end of each tube is connected to a tank for distributing cooling water to each tube, and the other end of each tube is connected to a tank for collecting cooling water flowing out from each tube. The first radiator and the second radiator are provided adjacent to each other.

  The tubes of the first radiator and the second radiator receive heat from the engine coolant water and the electrical system coolant water and expand. Generally, engine coolant water received from an engine is hotter than electrical system coolant water received from an electric motor and an electrical control circuit. For this reason, the tube of the first radiator through which the engine cooling water flows tends to expand more than the tube of the second radiator through which the electrical system cooling water flows.

  When such a difference in the amount of expansion occurs, the vicinity of the boundary where the first radiator and the second radiator are adjacent may be distorted to generate stress, which may lead to breakage of the radiator. For example, in each tank, stress may be generated between the portion where the tube of the first radiator is connected and the portion where the tube of the second radiator is connected, and the connection portions may be broken.

  In the radiator described in Patent Document 1 below, two dummy tubes are provided in the vicinity of the boundary where the first radiator and the second radiator are adjacent to each other, in order to suppress the stress caused by the difference in the expansion amount. The dummy tube is a tube through which engine cooling water or electrical system cooling water does not flow. Thereby, the radiator described in the following Patent Document 1 reduces the difference in the amount of expansion of the tube in the vicinity of the boundary, and aims to suppress the stress.

Japanese Patent Laid-Open No. 2002-115991

  However, the dummy tube described in Patent Document 1 is not intended to positively reduce the difference in the amount of expansion, and was not sufficient as a measure to prevent damage to the radiator. In addition, although it is conceivable to reduce the difference in expansion amount further by increasing the number of dummy tubes, the surface area effective for heat exchange between each cooling water and the air decreases accordingly. The performance of the radiator will be reduced.

  This invention is made in view of such a subject, The objective is the stress in the vicinity of the boundary where the 1st heat exchanging part and the 2nd heat exchanging part adjoin, maintaining the performance of heat exchange. To provide a heat exchange unit capable of suppressing

  In order to solve the above-mentioned subject, a heat exchange unit concerning the present invention is a heat exchange unit (10, 10A, 10B, 10C) which cools the fluid by performing heat exchange between fluid and air. Forming a plurality of first tubes (31) in which flow paths for flowing the first fluid are formed, and laminating the plurality of first tubes in a predetermined direction intersecting the direction in which the first fluid flows A first heat exchange portion (111) configured to perform heat exchange between the air flowing through the adjacent first tubes and the first fluid, and the first heat exchange portion in the predetermined direction A plurality of second tubes (33) provided adjacent to each other and having a flow path for flowing a second fluid formed therein, and configured by laminating the plurality of second tubes in the predetermined direction, Of adjacent second tubes A second heat exchange unit (112) for performing heat exchange between the flowing second air and the second fluid, and a downstream side surface of the first heat exchange unit and the second heat exchange unit in the air flow direction And a shroud (40, 40A, 40B, 40C) in which a fan arrangement hole (42) for disposing a fan (60) for sucking and blowing out air is provided. The shroud is a portion different from the fan disposition hole, and a portion corresponding to the first tube in the vicinity (B) of the boundary where the first heat exchange portion and the second heat exchange portion are adjacent to each other. , And the first air vents (43 451 452 453 47) for passing air.

  According to the above configuration, air can pass through the first vent formed in the shroud. For this reason, air can be positively supplied to the first tube in the vicinity of the boundary where the first heat exchange portion and the second heat exchange portion are adjacent to each other and to which the first air vents correspond.

  In the first tube, heat exchange between the first fluid and the air is promoted, so that the first fluid is surely cooled and the expansion amount of the first tube is reduced. Therefore, even when the temperature of the first fluid is higher than that of the second fluid, the stress in the vicinity of the boundary where the first heat exchange portion and the second heat exchange portion are adjacent is suppressed while maintaining the heat exchange performance. It becomes possible.

  According to the present invention, it is possible to provide a heat exchange unit capable of suppressing stress in the vicinity of the boundary where the first heat exchange unit and the second heat exchange unit are adjacent while maintaining the heat exchange performance. Can.

It is an exploded perspective view showing a radiator unit concerning a 1st embodiment. It is a front view which shows the radiator unit of FIG. It is sectional drawing which shows the III-III cross section of FIG. It is a front view showing a radiator unit concerning a 2nd embodiment. It is a front view showing a radiator unit concerning a 3rd embodiment. It is a front view showing a radiator unit concerning a 4th embodiment.

  Hereinafter, embodiments of the present invention will be described with reference to the attached drawings. In order to facilitate understanding of the description, the same constituent elements in the drawings are denoted by the same reference numerals as much as possible, and redundant description will be omitted.

  In order to facilitate understanding, as shown in FIG. 1, the direction in which a plurality of high temperature side tubes 31 and low temperature side tubes 33 described later extend is taken as the X direction, and the plurality of high temperature side tubes 31 and low temperature side tubes 33 Will be described using orthogonal coordinates in which the direction in which Y is stacked is the Z direction and the direction orthogonal to the X direction and the Z direction is the Y direction. The orthogonal coordinates correspond to those in FIG.

  First, the configuration of the radiator unit 10 according to the first embodiment will be described with reference to FIGS. 1 to 3. The radiator unit 10 is a heat exchange unit that cools the cooling water by performing heat exchange between the cooling water and the air, and is disposed in an engine room of a hybrid vehicle (not shown). The hybrid vehicle is a vehicle that has an engine and an electric motor and travels using the outputs of both. The radiator unit 10 cools the engine cooling water that cools the engine, and the electric system cooling water that cools an electric motor and an electric control circuit such as an inverter that supplies power to the electric motor.

  The radiator unit 10 includes a radiator 11, a shroud 40, and a fan 60.

  The radiator 11 is a heat exchanger that allows cooling water to flow therein and performs heat exchange between the cooling water and air. The radiator 11 has a first tank 21 and a second tank 22. Further, the radiator 11 has a plurality of high temperature side tubes 31, a high temperature side fin 32, a low temperature side tube 33, and a low temperature side fin 34 respectively.

  The first tank 21 has a metal plate header 211 and a tank header 212. The tank header 212 has a container shape in which an end portion on the X direction side is opened. By connecting the plate header 211 to the end of the tank header 212, a space is formed between the plate header 211 and the tank header 212.

  In the space between the plate header 211 and the tank header 212, a thin plate shaped partition wall 213 is disposed. The partition wall 213 is arranged to divide the space in the Z direction. Thus, the high temperature side distribution chamber 214 and the low temperature side distribution chamber 215 are partitioned between the plate header 211 and the tank header 212. A high temperature side inlet 216 communicating with the high temperature side distribution chamber 214 and a low temperature side inlet 217 communicating with the low temperature side distribution chamber 215 are provided on the side surface of the tank header 212.

  The second tank 22 has a plate header 221 made of metal and a tank header 222. The tank header 222 has a container shape in which the end on the −X direction side is open. By connecting the plate header 221 to the end of the tank header 222, a space is formed between the plate header 221 and the tank header 222.

  In the space between the plate header 221 and the tank header 222, a thin plate shaped partition wall 223 is disposed. The partition wall 223 is disposed to divide the space in the Z direction. Thus, the high temperature side collecting chamber 224 and the low temperature side collecting chamber 225 are partitioned between the plate header 221 and the tank header 222. A high temperature side discharge port 226 communicating with the high temperature side collecting chamber 224 and a low temperature side discharge port 227 communicating with the low temperature side collecting chamber 225 are provided on the side surface of the tank header 222.

  The first tank 21 and the second tank 22 are spaced apart in the X direction. The first tank 21 and the second tank 22 are disposed such that the plate headers 211 and 221 face each other.

  The high temperature side tube 31 and the low temperature side tube 33 are metal tubular members in which a channel extending in the X direction is formed. The high temperature side fins 32 and the low temperature side fins 34 are so-called corrugated fins and are formed by bending a thin metal plate. The plurality of high temperature side tubes 31 and the high temperature side fins 32 are provided to be alternately stacked in the Z direction. Similarly, a plurality of low temperature side tubes 33 and low temperature side fins 34 are also provided so as to be alternately stacked in the Z direction.

  The end of each high temperature side tube 31 on the -X direction side is inserted into a portion of the plate header 211 of the first tank 21 that corresponds to the high temperature side distribution chamber 214. Further, an end portion on the X direction side of each high temperature side tube 31 is inserted into a portion corresponding to the high temperature side collecting chamber 224 in the plate header 221 of the second tank 22. The end of each high temperature side tube 31 is connected to the plate header 211, 221 by brazing. Thereby, the flow path in each high temperature side tube 31 makes the high temperature side distribution chamber 214 and the high temperature side collecting chamber 224 connect.

  The high temperature side fins 32 are disposed between the high temperature side tubes 31, 31 adjacent to each other, and are connected to the side surfaces of the high temperature side tubes 31, 31 by brazing. The high temperature side fins 32 have a function to increase the area in which the fluid flowing inside the high temperature side tube 31 and the air passing through the outside of the high temperature side tube 31 exchange heat, thereby promoting the heat exchange.

  The end on the −X direction side of each low temperature side tube 33 is inserted into a portion of the plate header 211 of the first tank 21 that corresponds to the low temperature side distribution chamber 215. Further, the X-direction end of each low temperature side tube 33 is inserted into a portion of the plate header 221 of the second tank 22 corresponding to the low temperature side collecting chamber 225. The end of each low temperature side tube 33 is connected to the plate header 211, 221 by brazing. Thereby, the flow path in each low temperature side tube 33 connects the low temperature side distribution chamber 215 and the low temperature side collecting chamber 225 with each other.

  The low temperature side fins 34 are disposed between the adjacent low temperature side tubes 33, 33, and connected to the side surfaces of the low temperature side tubes 33, 33 by brazing. The low temperature side fins 34 have a function of increasing the area in which the fluid flowing inside the low temperature side tube 33 and the air passing through the outside of the low temperature side tube 33 exchange heat, and promoting the heat exchange.

  The shroud 40 is formed of a heat-resistant resin material, and has a rectangular shape in a front view. The shroud 40 has a thin plate shaped shielding plate 41. A fan disposition hole 42 is formed at the central portion of the shielding plate 41. The fan arrangement hole 42 is an opening penetrating the shielding plate 41 in the Y direction. The fan arrangement hole 42 has a circular shape in a front view.

  Further, a plurality of vent holes 43 are formed on both sides of the fan arrangement hole 42 in the X direction in the shielding plate 41. The vent hole 43 is an opening penetrating the shielding plate 41 in the Y direction. Each air vent 43 has a triangular shape in a front view. The plurality of vent holes 43 are arranged in line along the X direction.

  The fan 60 is a blower that sucks and blows air. The fan 60 has a hub 61 and a plurality of blades 62. The hub 61 is connected to an output shaft of a motor (not shown). Further, the plurality of blades 62 are arranged at intervals in the circumferential direction around the hub 61, and one end of each of the blades 62 is connected to the hub 61. When the hub 61 and the plurality of blades 62 are rotated by the drive of the motor, the fan 60 sucks and blows air in the direction along the rotation axis.

  The radiator unit 10 is configured by arranging the fan 60 in the fan disposition hole 42 of the shroud 40 and arranging the shroud 40 so as to cover the side surface of the radiator 11 on the −Y direction side with the shielding plate 41.

  Subsequently, flows of the cooling water and the air in the radiator unit 10 will be described. The radiator unit 10 is supplied with engine cooling water received from the engine and electric system cooling water received from the electric motor and the electric control circuit. Since a large amount of combustion heat is generated in the engine, generally, the temperature (for example, about 100 ° C.) of the engine cooling water supplied to the radiator unit 10 is higher than the temperature (for example, about 60 ° C.) of the electrical system cooling water .

  Engine cooling water is supplied to the high temperature side inlet 216 of the first tank 21 and flows into the high temperature side distribution chamber 214. The engine coolant that has flowed into the high temperature side distribution chamber 214 is distributed to the ends of the plurality of high temperature side tubes 31 communicating with the high temperature side distribution chamber 214. As a result, as shown by arrow L1 in FIG. 1, the engine cooling water flows from the first tank 21 side toward the second tank 22 through the flow paths in the high temperature side tubes 31.

  When the hybrid vehicle travels, air is taken into the engine room from the outside of the vehicle. The air flows to pass through the radiator 11 as shown by arrow A1 in FIG. Further, even when the hybrid vehicle is traveling at a low speed or when stopped, the air sucked along with the rotation of the fan 60 flows similarly.

  A portion of the air flows between the high temperature side tubes 31, 31. The air exchanges heat with the engine cooling water through the pipe wall of the high temperature side tube 31 and the inside of the high temperature side fin 32 by flowing through the outer surface of the high temperature side tube 31 and the surface of the high temperature side fin 32. As a result, the engine cooling water is cooled while flowing through the flow path in the high temperature side tube 31, and its temperature is lowered.

  The engine cooling water having flowed through the flow path in each high temperature side tube 31 flows into the high temperature side collecting chamber 224 with which the end portion of the high temperature side tube 31 is in communication and is collected. Thereafter, the engine cooling water is discharged from the high temperature side collecting chamber 224 through the high temperature side exhaust port 226 and used again for cooling the engine.

  On the other hand, the electrical system cooling water is supplied to the low temperature side inlet 217 of the first tank 21 and flows into the low temperature side distribution chamber 215. The electrical system cooling water flowing into the low temperature side distribution chamber 215 is distributed to the ends of the plurality of low temperature side tubes 33 communicating with the low temperature side distribution chamber 215. Thereby, as shown by arrow L 2 in FIG. 1, the engine cooling water flows from the first tank 21 side toward the second tank 22 side in the flow path in each low temperature side tube 33.

  Similarly to the case of the engine coolant, the electric system coolant also exchanges heat with the air flowing on the outer surface of the low temperature side tube 33 and the surface of the low temperature side fin 34. As a result, the electrical system cooling water is cooled while flowing through the flow path in the low temperature side tube 33, and its temperature decreases.

  The electric system cooling water which has finished flowing through the flow path in each low temperature side tube 33 flows into the low temperature side collecting chamber 225 in which the end of the low temperature side tube 33 is in communication, and collects. After that, the electric system cooling water is discharged from the low temperature side collecting chamber 225 through the low temperature side discharge port 227 and used again for cooling the electric motor and the electric control circuit.

  The air passing through the radiator 11 changes its traveling direction by the shroud 40 disposed downstream thereof. Specifically, as indicated by an arrow A4 in FIG. 3, the air passing through the portion of the radiator 11 corresponding to the fan disposition hole 42 of the shroud 40 substantially maintains the traveling direction of the fan disposition hole 42. It is discharged from between the radiator 11 and the shroud 40 via the same. Further, as shown by an arrow A5 in FIG. 3, most of the air passing through the portion of the radiator 11 other than the portion corresponding to the fan disposition hole 42 of the shroud 40 changes its traveling direction by the shielding plate 41 It is collected on the placement hole 42 side and discharged through the fan placement hole 42.

  As described above, the high temperature side distribution chamber 214, the high temperature side tube 31, the high temperature side fin 32, and the high temperature side collecting chamber 224 of the second tank 22 of the first tank 21 cool the engine cooling water. The exchange unit 111 is configured. Further, the low temperature side distribution chamber 215 of the first tank 21, the low temperature side tube 33, the low temperature side fins 34, and the low temperature side collecting chamber 225 of the second tank 22 have the low temperature side heat exchange section 112 for cooling the electric system cooling water. Configure. That is, the radiator 11 is a composite heat exchanger having the high temperature side heat exchange unit 111 and the low temperature side heat exchange unit 112 adjacent to each other at the boundary B shown in FIGS. 1 and 2.

  As described above, the temperature of the engine cooling water supplied to the high temperature side heat exchange unit 111 is higher than the temperature of the electrical system cooling water supplied to the low temperature side heat exchange unit 112. For this reason, the high temperature side tube 31 of the high temperature side heat exchange unit 111 through which the engine cooling water flows tends to expand more than the low temperature side tube 33 of the low temperature side heat exchange unit 112 through which the electrical system cooling water flows.

  Therefore, if the high temperature side heat exchange unit 111 and the low temperature side heat exchange unit 112 for cooling cooling water having different temperatures are provided adjacent to each other, strain and stress are generated in the vicinity of the boundary B. It may cause damage. For example, in the plate headers 211 and 221, stress is generated between the portion to which the high temperature side tube 31 is connected and the portion to which the low temperature side tube 33 is connected, and there is a risk that each connection portion may be damaged.

  With respect to such a problem, the radiator unit 10 suppresses the stress by the plurality of air holes 43 formed in the shroud 40, and prevents the radiator 11 from being damaged. Hereinafter, the operation of the vent 43 will be described.

  As shown in FIG. 2, the plurality of vents 43 are formed in the shroud 40 at a site different from the fan disposition hole 42 and at a site corresponding to the high temperature side tube 31 in the vicinity of the boundary B. .

  By forming a plurality of such vents 43 in the shroud 40, air can be passed through the vents 43. Therefore, as indicated by the arrow A3 in FIG. 1 and the arrow A6 in FIG. 3, air can be positively supplied to the high temperature side tube 31 in the vicinity of the boundary B to which the air vent 43 corresponds.

  In the high temperature side tube 31, heat exchange between the engine cooling water and the air is promoted, so that the engine cooling water is surely cooled, and the expansion amount of the high temperature side tube 31 becomes small. Therefore, even when the temperature of the engine cooling water is higher than that of the electrical system cooling water, the stress near the boundary B can be suppressed while maintaining the heat exchange performance.

  In addition, the plurality of air vents 43 are arranged along the high temperature side tube 31. As a result, air can be positively supplied to a wide area of the high temperature side tube 31, and the engine cooling water can be further reliably cooled, and the expansion amount of the high temperature side tube 31 can be reduced.

  Further, the fan arrangement hole 42 is formed at a portion of the shroud 40 corresponding to the boundary B. As a result, air can be positively supplied to the high temperature side tube 31 even at a portion corresponding to the fan disposition hole 42, and the engine cooling water can be further reliably cooled, and the expansion amount of the high temperature side tube 31 can be reduced.

  Next, a radiator unit 10A according to a second embodiment will be described with reference to FIG. The radiator unit 10A is a heat exchange unit mounted on a hybrid vehicle (not shown) and performing cooling of the engine coolant and the electrical system coolant, as in the first embodiment. The radiator unit 10A is different in the shape of the shroud 40A from the shape of the shroud 40 according to the first embodiment. About the structure same as the radiator unit 10 among the radiator units 10A, the same code | symbol is attached | subjected and description is abbreviate | omitted suitably.

  As shown in FIG. 4, the shroud 40A of the radiator unit 10A is formed with a vent 44 in addition to the vent 43 described above. The air vent 44 is formed at a portion corresponding to the low temperature side tube 33 near the boundary B.

  Thereby, air can be positively supplied to the low temperature side tube 33 in the vicinity of the boundary B to which the air vent 44 corresponds. In the low temperature side tube 33, heat exchange between the electric system cooling water and the air is promoted, so that the electric system cooling water is surely cooled and the expansion amount of the low temperature side tube 33 is reduced. That is, according to this configuration, the amounts of expansion of the high temperature side tube 31 and the low temperature side tube 33 are adjusted to be balanced by the air supplied by the air holes 43 and 44 respectively, and the stress in the vicinity of the boundary B is suppressed. can do.

  In addition, a plurality of vent holes 44 are formed and arranged in line along the low temperature side tube 33. Thus, air is positively supplied to a wide range of the low temperature side tube 33, the electric system cooling water is further surely cooled, and the expansion amounts of the high temperature side tube 31 and the low temperature side tube 33 are adjusted to be balanced. Can.

  Next, a radiator unit 10B according to a third embodiment will be described with reference to FIG. The radiator unit 10B is a heat exchange unit that is mounted on a hybrid vehicle (not shown) and cools the engine coolant and the electrical system coolant, as in the first embodiment. The radiator unit 10B is different in the shape of the shroud 40B from the shape of the shroud 40 according to the first embodiment. About the structure same as the radiator unit 10 among the radiator units 10B, the same code | symbol is attached | subjected and description is abbreviate | omitted suitably.

  As shown in FIG. 5, in the shroud 40B of the radiator unit 10B, vent holes 451, 452, 453 and vent holes 461, 462, 463 are formed.

  Each of the air vents 451 452 453 has a circular shape in a front view, and is formed in a portion corresponding to the high temperature side tube 31 in the vicinity of the boundary B. The air vents 451 452 453 are spaced apart from each other in the direction away from the boundary B in this order. In addition, the diameters which are the opening widths of the vent holes 451, 452, 453 decrease in this order.

  The vent holes 461, 462, 463 each have a circular shape in a front view, and are formed in a portion corresponding to the low temperature side tube 33 near the boundary B. The vents 461, 462, 463 are spaced apart from one another in the direction away from the boundary B in this order. Further, the diameters which are the opening widths of the vents 461, 462, 463 decrease in this order.

  Thus, the air vents 451 452 453 are spaced apart from each other in the direction away from the boundary B. Furthermore, the vent holes 452 and 453 disposed far from the boundary B have a smaller opening area than the vent holes 451 disposed near the boundary B. As a result, the flow rate of air passing through a region distant from the boundary B can be smaller than the flow rate of air passing through a region near the boundary B.

  Thus, by providing a difference in the flow rate of air between the vicinity of boundary B and the distance, in the high temperature side tube 31 in the vicinity of the boundary B, the engine coolant water and the air rather than the high temperature side tube 31 farther from the boundary B Heat exchange between the two. As a result, in the plurality of high temperature side tubes 31 of the high temperature side heat exchange unit 111, the expansion amount of each high temperature side tube 31 can be adjusted to be balanced, and breakage of the radiator can be prevented.

  Next, a radiator unit 10C according to a fourth embodiment will be described with reference to FIG. The radiator unit 10C is a heat exchange unit that is mounted on a hybrid vehicle (not shown) and cools the engine cooling water and the electric system cooling water, as in the first embodiment. The radiator unit 10C is different from the shroud 40 according to the first embodiment in the shape of the shroud 40C. About the structure same as the radiator unit 10 among the radiator units 10C, the same code | symbol is attached | subjected and description is abbreviate | omitted suitably.

  If the shroud 40C is provided with an opening other than the fan disposition hole 42, there is a disadvantage when air is allowed to pass through the radiator 11 by the rotation of the fan 60, such as when the hybrid vehicle is traveling at low speed or stopped. May occur. That is, with the rotation of the fan 60, air may be drawn between the radiator 11 and the shroud 40C through the openings other than the fan disposition hole 42. As a result, the flow rate of air passing through the radiator 11 may be reduced, which may cause the performance of the radiator 11 to be degraded.

  With respect to such a problem, in the shroud 40C of the radiator unit 10C, as shown in FIG. 6, the plurality of vent holes 47 are formed only in the region corresponding to the vicinity of the upstream end of the flow passage in the high temperature side tube 31 ing. In this way, air is positively supplied to the vicinity of the upstream end of the flow path in the high temperature side tube 31 through which particularly high temperature engine cooling water flows, and the amount of expansion of the high temperature side tube 31 is reduced. It is possible to suppress the suction of air. Thereby, damage to the radiator 11 can be prevented while maintaining the heat exchange performance.

  The embodiments of the present invention have been described above with reference to specific examples. However, the present invention is not limited to these specific examples. That is, those to which those skilled in the art appropriately modify the design of these specific examples are also included in the scope of the present invention as long as they have the features of the present invention. The elements included in each of the specific examples described above and their arrangements, materials, conditions, shapes, sizes, and the like are not limited to those illustrated, and can be changed as appropriate.

  In the above embodiment, the heat exchange unit for cooling the engine cooling water in the high temperature side heat exchange unit 111 and cooling the electrical system cooling water in the low temperature side heat exchange unit 112 has been described, but the present invention is limited to this aspect It is not a thing. For example, a heat exchange unit that cools, at the low temperature side heat exchange unit 112, the turbocharger cooling water used to cool the turbocharger is also included in the scope of the present invention.

  Moreover, although the said embodiment demonstrated the heat exchange unit comprised so that a cooling water could be flowed to a X direction in both the high temperature side tube 31 and the low temperature side tube 33, this invention is limited to this aspect is not. For example, while the cooling water flows in the X direction in the high temperature side tube 31, the heat exchange unit in which the radiator 11 is configured such that the cooling water flows in the -X direction in the low temperature side tube 33 is also within the scope of the present invention. Is included.

  Further, in the above embodiment, the heat exchange unit in which the shrouds 40, 40A, 40B, and 40C are formed to cover the entire high temperature side tube 31, the high temperature side fins 32, the low temperature side tube 33, and the low temperature side fins 34. Although described, the present invention is not limited to this embodiment. For example, a heat exchange unit in which the shroud is formed to cover only a part of the high temperature side tube 31 or the like is also included in the scope of the present invention.

10, 10A, 10B, 10C: Radiator unit (heat exchange unit)
31: High temperature side tube (first tube)
33: Low temperature side tube (second tube)
40, 40A, 40B, 40C: Shroud 42: Fan arrangement hole 43, 451, 452, 453, 47: Air vent (first air vent)
60: Fan 111: High temperature side heat exchange unit (first heat exchange unit)
112: Low temperature side heat exchange unit (second heat exchange unit)
B: Boundary

Claims (8)

A heat exchange unit (10, 10A, 10B, 10C) for cooling the fluid by heat exchange between the fluid and air,
A flow path through which the first fluid flows has a plurality of first tubes (31) formed therein, and the plurality of first tubes are stacked in a predetermined direction intersecting the direction in which the first fluid flows. A first heat exchange portion (111) for performing heat exchange between air flowing between the adjacent first tubes and the first fluid;
It has a plurality of second tubes (33) provided adjacent to the first heat exchange section in the predetermined direction and having a flow path for flowing the second fluid formed therein, and the plurality of second tubes A second heat exchange unit (112) configured by laminating in the predetermined direction and performing heat exchange between air flowing between the adjacent second tubes and the second fluid;
A fan disposition hole (42) is formed to cover a downstream side surface of the first heat exchange portion and the second heat exchange portion in the air flow direction and to arrange a fan (60) for sucking and blowing out the air. Shrouds (40, 40A, 40B, 40C), and
The shroud is a portion different from the fan disposition hole, and a portion corresponding to the first tube in the vicinity (B) of the boundary where the first heat exchange portion and the second heat exchange portion are adjacent to each other. A heat exchange unit formed with first vents (43, 451, 452, 453, 45, 47) for passing air; A plurality of first vents are formed,
The heat exchange unit according to claim 1, wherein the plurality of first vents are arranged along the first tube.   The shroud (40A, 40B) has a second vent (44, 461, 462, 463, 463) for passing air at a position corresponding to the second tube in the vicinity of the boundary. Heat exchange unit as described in.   The heat exchange unit according to claim 3, wherein a plurality of the second vent holes are formed and arranged to be aligned along the second tube.   The first air vents (451, 452, 453) are formed such that the flow rate of air passing through the area distant from the boundary is smaller than the flow rate of air passing through the area near the boundary The heat exchange unit according to claim 1. A plurality of first vents are formed,
The plurality of first vents are spaced apart from one another in a direction away from the boundary,
The heat according to claim 5, wherein the first vent (452, 453) located far from the boundary has a smaller opening area than the first vent (451) located near the boundary. Replacement unit.   The heat exchange unit according to claim 1, wherein the first air vent (47) is formed only at a portion corresponding to the vicinity of the upstream end of the flow passage in the first tube.   The heat exchange unit according to any one of claims 1 to 7, wherein the fan arrangement hole is formed in a portion of the shroud corresponding to the boundary.

Images