KR101338441B1 - Heat exchanger for vehicle - Google Patents

Abstract

A vehicle heat exchanger is disclosed. Vehicle heat exchanger according to an embodiment of the present invention is a plurality of plates are stacked alternately to form different connection flow paths therein, different working fluids are introduced into each other through each connection flow path is made of mutual heat exchange, A heat dissipation unit configured to divide one of the connection flow paths so that each of the supplied working fluids is circulated separately; And interconnecting one of the inflow and outflow holes of the plurality of inflow and outflow holes formed to inflow and outflow the respective working fluids from the heat dissipation unit, and bypass the working fluids according to the flow rate of the inflowing working fluids. It includes a branch to make.

Description

{HEAT EXCHANGER FOR VEHICLE}

The present invention relates to a vehicle heat exchanger, and more particularly to a vehicle heat exchanger in which the respective working fluid is introduced into the temperature is controlled through mutual heat exchange.

Generally, a heat exchanger transfers heat from a high temperature fluid to a low temperature fluid through a heat transfer wall, and is used in a heater, a cooler, an evaporator, a condenser, and the like.

The heat exchanger reuses thermal energy or adjusts the temperature of the inflowing working fluid according to the use, and is usually applied to an air conditioning system or a transmission oil cooler of a vehicle and mounted in an engine room.

Here, when the heat exchanger is installed in an engine room having a limited space, it is difficult to secure and mount the space, and research for reducing the size, weight, and high efficiency of the heat exchanger has been continued.

However, such a conventional heat exchanger must supply the working fluid to the engine, the transmission, or the air conditioner of the vehicle by adjusting the temperature of the working fluid according to the state of the vehicle, but for this purpose, Since a separate branch circuit and a valve must be installed on the flow path, there is a problem in that the number of components and assembly work is increased and the layout is complicated.

In addition, when the separate branch circuit and the valve is not installed, there is a problem that it is impossible to control the heat exchange efficiency according to the flow rate of the working fluid, so that the effective temperature control of the working fluid is impossible.

Korea Patent Publication No. 10-0591141 (2006.06.12)

Accordingly, embodiments of the present invention simultaneously operate the warm-up function and the cooling function of the working fluid by using the inflow flow rate of the working fluid according to the running state of the vehicle or the initial starting condition when the respective working fluids are controlled by mutual heat exchange therein. It is to provide a vehicle heat exchanger capable of controlling the temperature of the introduced working fluid to perform.

In addition, by dividing the connecting flow path through which the working fluid flows, different working fluids can be introduced and circulated, and the temperature of these working fluids can be adjusted according to the state of the vehicle, thereby improving fuel efficiency and heating performance of the vehicle. To provide a vehicle heat exchanger to simplify the configuration, reducing the assembly labor.

The vehicle heat exchanger according to an embodiment of the present invention for achieving this purpose is formed by alternately forming a plurality of connection flow paths alternately inside a plurality of plates are stacked, and different working fluids are introduced into each other to exchange heat inside each other Heat dissipation unit; And interconnecting one of the inflow and outflow holes of the plurality of inflow and outflow holes formed to inflow and outflow the respective working fluids from the heat dissipation unit, and bypass the working fluids according to the flow rate of the inflowing working fluids. Including a branch portion, wherein each of the inlet hole comprises a first, second, and third inlet hole respectively formed on both sides of one surface in the longitudinal direction of the heat dissipation unit, each discharge hole is the first, second, And a first spaced apart from the first, second, and third inflow holes on both sides in the longitudinal direction of the heat dissipation part corresponding to the third inflow hole, and connected to the respective connection flow paths inside the heat dissipation part. And second and third discharge holes, and each working fluid includes a coolant flowing from a radiator, a transmission oil flowing from an automatic transmission, and an engine oil flowing from an engine. 1 is circulated through the inlet hole and the first outlet hole, the transmission oil is circulated through the second inlet hole and the second outlet hole, the engine oil is circulated through the third inlet hole and the third outlet hole, Each connection flow path includes a first connection flow path through which the coolant flows through the first inflow hole, and a transmission oil located under the first connection flow path and flowing through the second inflow hole. And a third connection passage, which is located above the first connection passage and moves, and a third connection passage through which the engine oil flowing through the third inlet hole moves. The third connection channel is formed in a plurality of sets by using one set of three connection channels each consisting of a second connection channel disposed above the first connection channel and a third connection channel disposed below. The connection flow path inside the heat dissipation unit Beonjeok is formed in the second connecting flow path and the third connecting flow path may be formed to cross between each of said first connecting passage.

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The branch part may be formed to interconnect between the first inlet hole and the first outlet hole, and protrude to one surface of the heat dissipation unit.

The first inlet hole and the first outlet hole may be formed at each corner in a diagonal direction from one surface of the heat dissipation unit.

The second inlet hole and the second outlet hole may be formed at each corner in a diagonal direction from one surface of the heat dissipation unit, and may be formed to face each other in the first inlet hole and the first outlet hole.

The third inlet hole and the third outlet hole are formed in a diagonal direction at positions spaced apart from the second inlet hole and the second outlet hole on one surface of the heat dissipation unit, respectively, in the first inlet hole and the first outlet hole. It can be formed opposite.

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The branching portion forms a separate bypass flow path to discharge the coolant flowing into the first inlet hole directly to the first outlet hole separately from the first connection channel at a position proximate to the first inlet hole and the first outlet hole. can do.

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According to the heat exchanger for a vehicle according to the embodiment of the present invention as described above, when the respective working fluids control the temperature through mutual heat exchange therein, the working fluid using the inflow flow of the working fluid according to the running state or the initial starting conditions of the vehicle It is possible to efficiently control the temperature of the introduced working fluid so that the warm-up function and the cooling function can be performed simultaneously.

In addition, it is possible to adjust the temperature of the working fluid according to the state of the vehicle, it is possible to improve the fuel economy of the vehicle, and to improve the heating performance, it is possible to simplify the configuration to reduce the assembly labor.

In addition, by eliminating the branch circuit that is conventionally installed separately and integrally formed, it is possible to reduce manufacturing cost and improve workability, increase space utilization in a narrow engine room, and simplify the layout of the connection hoses.

In addition, among the working fluids that are subject to heat exchange, when the automatic transmission oil is included, it is possible to simultaneously perform a warm-up function for reducing friction during cold start and a cooling function for preventing slip and driving durability while driving, thereby improving fuel economy and transmission durability. Can be.

In addition, it is possible to warm up or cool the automatic transmission oil and engine oil by water cooling using cooling water, thereby improving heat exchange efficiency compared to an air-cooled heat exchanger, thereby improving the overall cooling performance and heating performance of the vehicle cooling system.

In addition, the two working fluids can be mutually heat exchanged with the cooling water through one heat exchanger through which the cooling water is introduced, thereby simplifying the overall package of the cooling system.

1 is a configuration diagram of a cooling system to which a vehicle heat exchanger according to an embodiment of the present invention is applied.
2 is a perspective view of a vehicle heat exchanger according to an embodiment of the present invention.
3 is a sectional view taken along the line AA in Fig.
4 is a cross-sectional view taken along line BB of FIG. 2.
5 is a cross-sectional view taken along line CC of FIG. 2.
6 is a view showing the arrangement relationship of each connection flow path in the vehicle heat exchanger according to an embodiment of the present invention.
7 is a view showing the arrangement relationship of each connection flow path in a vehicle heat exchanger according to another embodiment of the present invention.
8 and 10 are views showing the flow direction of each working fluid applied to the vehicle heat exchanger according to an embodiment of the present invention.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings.

It is to be understood that both the foregoing general description and the following detailed description of the present invention are exemplary and explanatory only and are not restrictive of the invention, It should be understood that various equivalents and modifications may be present.

1 is a configuration diagram of a cooling system to which a vehicle heat exchanger according to an embodiment of the present invention is applied.

Referring to the drawings, the vehicle heat exchanger 100 according to an exemplary embodiment of the present invention, when the respective working fluids control the temperature through mutual heat exchange therein, the inflow of the working fluids according to the running state of the vehicle or the initial starting conditions The flow rate of the working fluid is controlled so that the warm-up function and the cooling function of the working fluid can be performed simultaneously using the flow rate.

To this end, the cooling system to which the vehicle heat exchanger 100 is applied according to an embodiment of the present invention, as shown in Figure 1, basically, a radiator equipped with a cooling fan 13 through the water pump 11 A cooling line (hereinafter referred to as 'C.L') is provided to cool the engine 17 while the coolant cooled while passing through 15 is provided on the cooling line CL. It comprises a heater core 19 to be connected.

Here, the cooling system according to an embodiment of the present invention includes a heat dissipation unit 110 and a branch portion 120, and includes a heat exchanger 100 provided between the water pump 11 and the heater core 19. do.

Here, the heat dissipation unit 110 is provided on the cooling line (C.L), at least one working fluid is introduced to exchange heat with the cooling water.

The heat dissipation unit 110 has a connection passage 113 through which the coolant is circulated therebetween, and forms a separate connection passage 113 in the upper and lower portions, respectively.

In the heat dissipation unit 110 configured as described above, the engine oil and the transmission oil respectively introduced from the engine 17 and the automatic transmission 21 as the working fluid are introduced into each of the separate connection passages 113 and circulated with the coolant. Heat exchange.

Here, each of the connection passages 113 may include a first connection passage 113a through which cooling water is circulated, and a transmission oil flowing from the automatic transmission 21 arranged in an upper portion of the first connection passage 113a. A third connection passage disposed below the first connection passage 113a and corresponding to the second connection passage 113b and the second connection passage 113b and configured to circulate engine oil flowing from the engine 17. And 113c.

Meanwhile, the second and third connection passages 113b and 113c may be disposed to intersect between the alternately formed first connection passages 113a.

That is, each of the connection flow passages 113 may include transmission oil and engine oil flowing through the second and third connection flow passages 113b and 113c, respectively, above and below the first connection passage 113a through which the coolant flows. The second connecting passage 113b or the third connecting passage 113c may be formed to intersect between the alternately formed first connecting passages 113a.

In addition, the branch part 120 may bypass the cooling water introduced according to the flow rate of the cooling water immediately without passing through the heat radiating part 110 or may flow into the inside of the heat radiating part 110.

On the other hand, the detailed configuration and operation of the heat exchanger 100 applied to the cooling system in the embodiment of the present invention will be described in more detail below.

In addition, the engine 17 and the automatic transmission 21 are oil lines in which the heat dissipation unit 110 and oil flow (Oil Line, hereinafter referred to as 'O.L'). Interconnected via .L1, O.L2).

That is, in this embodiment, each of the working fluid is composed of the coolant flowing from the radiator 15, the transmission oil flowing from the automatic transmission 21, the engine oil flowing from the engine 17, the heat exchanger Through 100, the transmission oil and the engine oil are mutually heat exchanged with the cooling water to adjust the temperature of the transmission oil and the engine oil.

The heat exchanger 100 includes a heat dissipation unit 110 and a branch unit 120 as described above, which will be described in more detail with reference to FIGS. 2 to 5 as follows.

Figure 2 is a perspective view of a vehicle heat exchanger according to an embodiment of the present invention, Figure 3 is a cross-sectional view taken along line AA of Figure 2, Figure 4 is a cross-sectional view taken along line BB of Figure 2, Figure 5 is a CC of Figure 2 6 is a cross-sectional view taken along a line, and FIG. 6 is a diagram illustrating an arrangement relationship of each connection channel in a vehicle heat exchanger according to an exemplary embodiment of the present invention.

First, the heat dissipation unit 110 is formed by stacking a plurality of plates 111 and alternately forming different connection flow passages 113 therein.

Different working fluids are introduced into each connection flow passage 113 to pass through each connection flow passage, thereby mutually exchanging heat.

Here, the heat dissipation unit 110 is a counterflow (counter flow) of the flow of each working fluid is to be exchanged with each other.

The heat dissipation unit 110 configured as described above may be formed in a plate shape (or also referred to as a “plate shape”) in which a plurality of plates 111 are stacked.

In addition, the branch part 120 is discharged from any one of the inlet hole 115 and the outlet hole 115 and the outlet hole 117 formed to inlet and discharge each working fluid in the heat dissipation unit 110, respectively. The holes 117 are interconnected.

This branch 121 bypasses the working fluid in accordance with the flow rate of the working fluid introduced.

In this embodiment, each of the inlet holes 115 is composed of first, second, third inlet holes (115a, 115b, 115c) formed on both sides of one surface in the longitudinal direction of the heat dissipation unit (110).

Each of the discharge holes 117 corresponds to the first, second, and third inlet holes 115a, 115b, and 115c in the longitudinal direction of the heat dissipation unit 110, respectively. And third inflow holes 115a, 115b, and 115c, respectively.

Each of the discharge holes 117 may include first, second, and third discharge holes 117a, 117b, and 117c which are interconnected through respective connection flow passages 113 in the heat dissipation unit 110. have.

Here, the first inlet hole 115a and the first outlet hole 117a are formed at each corner portion in a diagonal direction from one surface of the heat dissipation unit 110.

In the present embodiment, the second inlet hole 115b and the second outlet hole 117b are formed at each corner portion in a diagonal direction from one surface of the heat dissipation unit 110, and the first inlet hole 115a and the first inlet hole 115a and the second outlet hole 117b are formed. 1 is formed to face each other in the discharge hole (117a).

The third inlet hole 115c and the third outlet hole 117c are diagonally positioned at positions spaced apart from the second inlet hole 115b and the second outlet hole 117b on one surface of the heat dissipation unit 110, respectively. It is formed in the direction and is formed to face each other in the first inlet hole (115a) and the first discharge hole (117a).

The branch portion 120 interconnects between the first inflow hole 115a and the first discharge hole 117a and is formed to protrude to one surface of the heat dissipation part 110.

In this embodiment, the coolant is circulated through the first inlet hole 115a and the first outlet hole 117a, and the transmission oil is circulated through the second inlet hole 115b and the second outlet hole 117b. The engine oil is circulated through the third inlet hole 115c and the third outlet hole 117c.

Meanwhile, connection ports (not shown) may be mounted in the first, second, and third inlet holes 115a, 115b, and 115c and the first, second, and third discharge holes 117a, 117b, and 117c, respectively. The connection port may be connected to the radiator 15, the automatic transmission 21, and the engine 17 through a connection hose or a connection pipe.

In the present embodiment, each of the connection passages 113 is divided into first, second and third connection passages 113a, 113b, and 113c, as shown in FIG. 6, which will be described in more detail below. .

First, the first connection flow passage 113a moves through the coolant through the first inlet hole 115a in the heat dissipation unit 110.

In this embodiment, the second connection passage 113b is positioned below the first connection passage 113a, and the transmission oil flowing through the second inflow hole 115b is moved.

In addition, the third connection passage 113c is positioned above the first connection passage 113a, and the engine oil flowing through the third inlet hole 115c moves.

Here, the first, second, and third connection passages 113a, 113b, and 113c may include a second connection passage 113b disposed above the first connection passage 113a and a third disposed below. Each of the three connection passages 113 constituted by the connection passages 113c can be formed into a plurality of sets.

That is, each of the connection flow passages 113 includes a set of second and third connection flow passages 113b and 113c formed at an upper side and a lower side, respectively, around the first connection passage 113a through which the coolant moves. It is provided with a plurality inside the heat exchange between the coolant and the transmission oil, the engine oil.

Accordingly, when the temperature of the transmission oil is to be increased during initial start-up and idling of the vehicle, the first and third connection passages 113a and 113c configured to flow the coolant having a rapid temperature rise and the engine oil flow therebetween. It is possible to quickly increase the temperature of the transmission oil through the two connecting passages (113b).

On the other hand, in the vehicle heat exchanger according to another embodiment of the present invention will be described with respect to the arrangement of each connection flow passage through FIG.

7 is a view showing the arrangement relationship of each connection flow path in a vehicle heat exchanger according to another embodiment of the present invention.

Referring to the drawings, each connection flow path 213 according to another embodiment of the present invention is a cooling water is moved, the first connection flow path (213a) is formed alternately in the heat dissipation unit 110, and each of The second connection passage 213b through which the transmission oil moves and the third connection passage 213c through which the engine oil moves may intersect between the first connection passage 213a.

That is, the second connection flow passage 213b and the third connection flow passage 213c are arranged to intersect between the first connection flow passages 213a alternately formed inside the heat dissipation part 110, thereby providing a first connection. The cooling water passing through the flow path 213a, the transmission oil, and the engine oil are heat-exchanged with each other.

Accordingly, when the vehicle heat exchanger 100 according to another embodiment of the present invention requires cooling of the transmission oil and the engine oil according to the driving state of the vehicle, the cooling water flows to the upper and lower portions of the transmission oil and the engine oil, thereby performing heat exchange. Cooling performance is improved.

The branch part 120 is a coolant introduced into the first inlet hole 115a separately from the first connection passage 113a at a position close to the first inlet hole 115a and the first outlet hole 117b. A separate bypass flow passage 121 is formed to immediately discharge the gas to the first discharge hole 117a.

Here, the bypass passage 121 does not flow into the first connection passage 113a of the heat dissipation unit 110 when the flow rate of the cooling water is small when the cooling water flows through the first inflow hole 115a. Instead, the first discharge hole 117a is discharged directly.

8 to 10 are views showing the flow direction of each working fluid applied to the vehicle heat exchanger according to an embodiment of the present invention.

The bypass flow passage 121, as shown in (S1) of Figure 8, when the transmission oil warm-up according to the state or mode of the vehicle, such as the driving state, the idle mode, or the initial start-up of the vehicle, the coolant is first By bypassing the inflow passage 113a, the engine oil and the transmission oil flowing through the second and third connection passages 113b and 113c are prevented from decreasing in temperature through heat exchange with the cooling water. .

On the contrary, when the flow rate of the cooling water is large, the cooling water is introduced into the first connection passage 113a together with the bypass passage 121 as shown in FIG. 8 (S2).

Accordingly, the coolant passing through the first connection passage 113a flows in from the automatic transmission 21 and the engine 17 through the second inflow hole 115b and the third inflow hole 115c, respectively. The engine oil and the transmission oil passing through the third connection passages 113b and 113c are respectively heat-exchanged inside the heat dissipation unit 110.

Here, the transmission oil and the engine oil are introduced through the second inflow hole 115b and the third inflow hole 115c, respectively, as shown in FIGS. 9 and 10.

The transmission oil and the engine oil pass through the second and third connection passages 113b and 113c respectively formed in the upper and lower portions with the first connection passage 113a interposed therebetween in the heat dissipation unit 110. While being heat-exchanged with the cooling water selectively introduced into the first connection passage 113a, it is discharged through the second discharge hole 117b and the third discharge hole 117c, respectively, to the automatic transmission 21 and the engine 17. Circulated.

Accordingly, when the vehicle runs, the engine oil whose temperature is increased by the operation of the engine 17 and the transmission oil that is heated by the fluid friction generated by the operation of the torque converter and require cooling are cooled by the heat dissipation unit 110. It is supplied to the engine 17 and the automatic transmission 21 in a cooled state through mutual heat exchange with.

That is, the heat exchanger 100 supplies the cooled engine oil and the transmission oil to the automatic transmission 21 which is rotated at high speed with the engine 17 when the vehicle runs, thereby knocking and knocking the engine 17. This prevents rancidity and prevents slippage of the automatic transmission 21.

On the contrary, when the vehicle is initially started or idled, the flow rate of the coolant flowing into the heat exchanger 100 is small, so that the coolant is bypassed to the bypass passage 121 of the branch 120 so that the engine oil and the transmission oil The heat exchange is small, so warm-up is possible, and heating performance can be improved.

In addition, after the vehicle is started, during the high speed driving, the temperature of the engine oil and the transmission oil is increased by heat exchange in the heat dissipation unit 110 with coolant having a rapid temperature rise and then supplied to the engine 17 and the automatic transmission 21. By doing so, it is possible to reduce the frictional loss in the engine 17 and the automatic transmission 21 to increase fuel economy.

Therefore, according to the vehicle heat exchanger 100 according to the embodiment of the present invention configured as described above, each of the working fluid is operated in accordance with the running state of the vehicle or the initial starting conditions when the temperature is controlled through mutual heat exchange therein By using the flow rate of the fluid, it is possible to efficiently control the temperature of the introduced working fluid to perform the warm-up function and the cooling function of the working fluid at the same time.

In addition, it is possible to adjust the temperature of the working fluid according to the state of the vehicle, it is possible to improve the fuel economy of the vehicle, and to improve the heating performance, it is possible to simplify the configuration to reduce the assembly labor.

In addition, by removing the branch circuit that is conventionally installed separately and forming the branch unit 120 integrally, it is possible to reduce the production cost and workability, to increase the space utilization in the narrow engine room, layout of the connection hose Can be simplified.

In addition, when transmission oil is included among the working fluids that are subject to heat exchange, it is possible to simultaneously perform a warm-up function for reducing friction during cold start and a cooling function for preventing slippage and durability while driving, thereby improving fuel economy and transmission durability. have.

In addition, the transmission oil and engine oil can be warmed up or cooled by water cooling using cooling water as a cooling medium, thereby improving heat exchange efficiency compared to an air-cooled heat exchanger, thereby improving overall cooling performance and heating performance of the vehicle cooling system.

On the other hand, in the description of the vehicle heat exchanger 100 according to an embodiment of the present invention, each working fluid is described as an embodiment consisting of a coolant and a transmission oil, but is not limited to this, cooling or by heat exchange It can be applied to all working fluids requiring temperature rise.

And in the present invention to describe a vehicle heat exchanger according to an embodiment, it has been described as an embodiment that the plurality of plates 111 are simply stacked on the drawings, but is not limited thereto, the heat exchanger 100 of In consideration of the mounting, a cover, a bracket, etc. may be installed on one side and the other side to prevent breakage due to contact with other components or to fix the other components or the inside of the engine room.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is to be understood that the invention is not limited to the disclosed exemplary embodiments. It will be understood that various modifications and changes may be made without departing from the scope of the appended claims.

11: water pump
13: cooling fan
15: radiator
17: engine
19: heater core
21: automatic transmission
100: heat exchanger
110: heat dissipation unit
111: plate
113: Euro connection
113a, 113b, and 113c: first, second, and third connection flow paths
115: inlet hole
115a, 115b, 115c: first, second and third inflow holes
117 discharge hole
117a, 117b, and 117c: first, second and third discharge holes
120: branch
121: Bypass Euro
213a, 213b, and 213c: first, second and third connection flow paths

Claims (17)

A plurality of plates stacked in order to alternately form different connection flow paths sequentially therein, and a heat dissipation part in which different working fluids are introduced to exchange heat inside each other; And
Interconnecting any one of the inlet and outlet holes of the plurality of inlet and outlet holes formed to inlet and discharge each working fluid in the heat dissipation unit, and bypassing the working fluid in accordance with the flow rate of the working fluid Including; but including,
Each of the inflow holes includes first, second, and third inflow holes respectively formed on both sides of one surface in the longitudinal direction of the heat dissipation part, and each of the discharge holes is formed in the first, second, and third inflow holes. Correspondingly, the first, second, and third inlet holes are spaced apart from the first, second, and third inlet holes on both sides in a length direction of the heat dissipation unit, and are respectively connected to the respective connection flow paths inside the heat dissipation unit. Including an exhaust hole,
Each working fluid includes a coolant flowing from a radiator, a transmission oil flowing from an automatic transmission, and an engine oil flowing from an engine.
The cooling water is circulated through the first inlet hole and the first outlet hole, the transmission oil is circulated through the second inlet hole and the second outlet hole, and the engine oil is through the third inlet hole and the third outlet hole. Circulated,
Each of the connection flow paths includes a first connection flow path through which the coolant flows through the first inflow hole, and a transmission oil positioned under the first connection flow path and flowing through the second inflow hole. The second connecting flow path is moved, and is positioned above the first connection flow path, and includes a third connection flow path through which the engine oil flowing through the third inflow hole,
The first, second, and third connection passages may include a plurality of three connection passages each including a second connection passage disposed above the first connection passage and a third connection passage disposed below the first connection passage. Formed of three
And the first connection channel is alternately formed inside the heat dissipation unit, and the second connection channel and the third connection channel are formed to cross each other between the first connection channel. delete The method of claim 1,
The branch portion
Wherein the first heat exchanger and the second heat exchanger connect the first inlet hole and the first outlet hole to each other and protrude from one surface of the heat radiator. The method of claim 1,
The first inlet hole and the first outlet hole
Vehicle heat exchanger, characterized in that formed on each corner in a diagonal direction from one surface of the heat radiating portion. The method of claim 1,
The second inlet hole and the second outlet hole
A vehicle heat exchanger is formed in each corner portion in a diagonal direction from one surface of the heat dissipation unit, the first inlet hole and the first outlet hole are formed to face each other. The method of claim 1,
The third inlet hole and the third outlet hole
A vehicle heat exchanger is formed in a diagonal direction at positions spaced apart from the second inlet hole and the second outlet hole on one surface of the heat dissipation unit, and is formed to face the first inlet hole and the first outlet hole. . delete delete delete delete The method of claim 1,
The branch portion
A vehicle heat exchanger for forming a separate bypass flow path to discharge the coolant flowing into the first inflow hole directly to the first discharge hole separately from the first connection channel at a position close to the first inflow hole and the first discharge hole. group. delete delete delete delete delete delete

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