JP2002107094A - Heat exchanger for vehicle - Google Patents

Abstract

PROBLEM TO BE SOLVED: To eliminate the possibility of heat injury by lowering the temperature of air passing through a radiator and a condenser, disposed overlapped longitudinally and entering inside an engine room. SOLUTION: A condenser 10 is adapted, such that a heat exchange area 11 between first and second galleries 14, 16 are divided into an upstream side cooling section 12 and a downstream side cooling section 13, and a refrigerant flows in the direction indicated by an arrow A from the first gallery, through a main cooling section and returns at the second gallery and flows through a sub-cooling section as indicated by an arrow B. A radiator 30 is adapted, such that a heat exchange area 31 between left and right first tanks 34 and a second tank 36 is divided into a main cooling section 32 and a sub-cooling section 33. Cooling water flows through the main cooling section from the first tank, as indicated by an arrow C with a part thereof being sent to a water pump from a first cooling water outlet 48 of the second tank. A remaining section flows oppositely, through the sub-cooling section from the second tank as indicated by an arrow D and is further cooled. Since the flow directions through the downstream side cooling section and the sub-cooling section are same, temperature of air passing therethrough is sharply lowered.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a structure of a heat exchanger provided with a radiator for engine cooling water and a condenser for an air conditioner refrigerant in a vehicle.

[0002]

2. Description of the Related Art A radiator for cooling engine cooling water and a condenser for condensing refrigerant of an air conditioner are provided at a front portion of an engine room of a vehicle. In many cases, these radiators and condensers are placed one on top of the other in order to increase the power consumption and to share the cooling fan.

Here, as shown in FIG.
In the structure of No. 0, the cooling gallery 18 is provided in the first gallery 14 and the second gallery 16 on the left and right sides to allow the refrigerant to flow in the horizontal direction, and the heat exchange area 11 is divided into two vertically. This is the upstream cooling unit 1 with a large ventilation area
2. The lower part is a downstream cooling part 13 having a small ventilation area, the refrigerant first flows through the upstream cooling part 12 as shown by arrow A, then turns back, and the downstream cooling part 13 is turned in the opposite direction as shown by arrow B. The refrigerant is surely condensed by extending the heat exchange distance of the refrigerant as it flows. Downstream cooling unit 1
At 3, the refrigerant is cooled to near 50 ° C. on the other hand,
The radiator 60 is provided with a cooling passage 64 between the upper and lower tanks 62 and 63 so as to flow the refrigerant in the vertical direction as shown by the arrow G, and the cooling water that is cooled and enters the lower tank 63 is approximately 80%. ° C.

[0004]

The temperature of the air passing through the condenser 10 and the radiator 60 and entering the engine room corresponds to the temperature of the refrigerant or cooling water flowing through the cooling passages 18, 64 of the condenser 10 or the radiator 60. . Therefore, although the air temperature changes depending on which part of the ventilation area has passed, when the radiator 60 and the condenser 10 are arranged in front and back, the temperature of the cooling water flowing through the radiator 60 and the temperature flowing through the condenser 10 are reduced. So to speak, the air that has been heated and eventually heated encloses various devices in the engine room.

[0005] When such high-temperature air is supplied, for example, in the vicinity of a turbocharger which is originally high in temperature, there is a risk of causing heat damage to various equipment parts. A similar problem also occurs in a combined heat exchanger in which a radiator and a condenser are stacked and integrated. In particular, in the case of a composite heat exchanger, the cooling water cooling passage and the refrigerant cooling passage are connected by a common radiating fin.
The refrigerant cooled to near 0 ° C. may be heated again by the high temperature of the cooling water on the radiator side, which may cause a decrease in the performance of the air conditioner.

SUMMARY OF THE INVENTION Accordingly, the present invention has been made in view of the above problems, and in a vehicle heat exchanger including a radiator and a condenser arranged one above the other, the temperature of air entering the engine room after heat exchange has been significantly reduced. It is intended to provide a heat exchanger that eliminates the risk of heat damage.

[0007]

According to the first aspect of the present invention, a heat exchange region in which cooling passages are arranged in a lateral direction is divided into upper and lower upstream cooling portions and downstream cooling portions, and a refrigerant is provided. The air conditioner condenser including the reverse flow in the downstream cooling section after flowing through the upstream cooling section, and the heat exchange area in which the cooling passages are arranged in the horizontal direction are divided into upper and lower main cooling sections and sub cooling sections. Radiator for cooling the engine, including cooling water flowing in one direction in the main cooling section and then turning back in the sub-cooling section.The heat exchange area of the condenser and the heat of the radiator The replacement areas were placed one on top of the other, with the sub-cooling section of the radiator and the downstream cooling section of the condenser facing each other. The cooling water in the sub-cooling section of the radiator and the refrigerant in the cooling section on the downstream side of the condenser include a portion in the same flow direction, and the temperature of the air entering the engine room through the two sub-cooling sections arranged one above the other is remarkable. Can be reduced.

According to a second aspect of the present invention, the boundary between the main cooling section and the sub-cooling section of the radiator is set at the same height as the boundary between the upstream cooling section and the downstream cooling section of the condenser.

According to a third aspect of the present invention, the radiator is configured such that one end of the cooling passage is connected to the first tank, and the other end of the cooling passage is connected to the second tank. The first chamber communicating with the cooling section and the second chamber communicating with the sub-cooling section
The inside of the second tank is divided into a third chamber communicating with the main cooling section and a fourth chamber communicating with the sub-cooling section by a bypass plate having a throttle hole, and the third chamber has a third chamber. One cooling water outlet is provided, a cooling water inlet is provided in the first chamber of the first tank, and a second cooling water outlet is provided in the second chamber. Most of the cooling water flowing through the main cooling section is the first
The cooling water outlet is discharged from the cooling water outlet, and the remaining part is reduced in flow velocity by the throttle hole, and is cooled significantly by the sub cooling part.

According to a fourth aspect of the present invention, the radiator is configured such that one end of the cooling passage is connected to the first tank and the other end of the cooling passage is connected to the second tank. Is divided into a first chamber communicating with the sub-cooling unit and a second chamber communicating with the sub-cooling unit. The first chamber is provided with a cooling water inlet. A fifth chamber communicating with the main cooling section and a sixth chamber communicating with the rest of the sub-cooling section are defined. The fifth chamber has a first cooling water outlet, and the sixth chamber has a second cooling water outlet. A cooling water outlet was provided. Since the cooling water flowing to the sub-cooling section is turned back in the second chamber of the first tank, the flow path length of the cooling water in the sub-cooling section is 2
Double. In this case, it is preferable to set the cross-sectional area of the cooling passage communicating with the fifth chamber in the sub-cooling section smaller than the cross-sectional area of the cooling passage communicating with the sixth chamber, and adjust the flow rate. preferable.

[0011]

Embodiments of the present invention will be described below. FIG. 1 is a plan view showing an arrangement of a radiator and a capacitor in the embodiment. FIG. 2 is a perspective view showing the radiator and the condenser separated from each other in order to show the flow direction of the cooling water in the radiator and the flow direction of the refrigerant in the condenser. The condenser 10 and the radiator 30, as shown in FIG.
1, 31 are placed one on top of the other, are very close to each other, and are arranged at the front end of the engine compartment.

The condenser 10 includes a first gallery 14 and a second gallery 16 on both left and right sides of the heat exchange area 11. The first gallery 14 and the second gallery 16 are connected by a plurality of cooling passages 18. Are provided with fins 19. The heat exchange region 11 of the condenser 10 is divided into an upper cooling section 12 having an upper ventilation area and a lower cooling section 13 having a lower ventilation area. A broken line a in FIG. 2 indicates a division line between the upstream cooling unit 12 and the downstream cooling unit 13.

As shown in FIG. 3, the inside of the first gallery 14 is partitioned by a partition plate 15 into a first chamber 21 communicating with the upstream cooling section 12 and a second chamber 22 communicating with the downstream cooling section 13. ing. The refrigerant that has entered the first chamber 21 of the first gallery 14 from a pipe (not shown) connected to the connector 23 first causes the upstream cooling unit 12 to move from the first gallery 14 on the left side in the drawing to the It flows to the second gallery 16 and then returns from the second gallery 16 and flows through the downstream cooling unit 13 in the direction opposite to the direction in the upstream cooling unit 12 as shown by arrow B. And the refrigerant returned to the first gallery 14 is the second refrigerant.
The water is sent from the connector 24 of the chamber 22 to a pipe (not shown).

Returning to FIG. 2, the radiator 30 includes a first tank 34 and a second tank 36 on both left and right sides of the heat exchange area 31.
The heat exchange area 31 is divided into an upper main cooling section 32 having a large ventilation area and a lower sub cooling section 3 having a small ventilation area.
It is divided into three. A broken line b in FIG. 2 indicates a division line between the main cooling unit 32 and the sub cooling unit 33. The main cooling unit 32 and the sub cooling unit 33 are configured by connecting a plurality of cooling passages 38 between the first tank 34 and the second tank 36, respectively. Fins 39 are provided between the cooling passages 38.
The flow area of the cooling water in the main cooling section 32 and the sub-cooling section 33 is determined by the total cross-sectional area of each cooling passage 38. As in the case of the condenser 10, the cooling water first flows through the main cooling section 32 from the first tank 34 on the left side to the second tank 36 on the right side as shown by arrow C, and then returns from the second tank 36 to return to the sub-cooling section. 33 is the main cooling part 32 as shown by arrow D.
Flows in the opposite direction to

FIG. 4 shows the structure inside the first tank 34 and the second tank 36 of the radiator 30. In the first tank 34,
The partition plate 35 is divided into a first chamber 41 communicating with the main cooling unit 32 and a second chamber 42 communicating with the sub cooling unit 33.
Inside the second tank 36, the third chamber 4 communicating with the main cooling unit 32 is provided.
A fourth chamber 45 communicating with 4 and the sub-cooling section 33 is defined by a bypass plate 46 having a throttle hole 47. Aperture 4
7 is preferably set so that the flow rate of the cooling water to the fourth chamber 45 communicating with the sub-cooling section 33 is about 1/10 to 1/30 of the total flow rate. A first cooling water outlet 48 is provided below the third chamber 44 of the second tank 36. A cooling water inlet 43 is provided at an upper portion of the first chamber 41 communicating with the main cooling unit 32 of the first tank 34, and a second cooling water inlet 43 is provided with the second cooling unit 33.
A second cooling water outlet 49 is provided at a lower portion of the chamber 42.

The cooling water that has entered the first chamber 41 of the first tank 34 from a hose (not shown) connected to the cooling water inlet 43 flows through the main cooling section 32 as shown by arrow C as described above. Most of the cooling water that has entered the third chamber 44 of the second tank 36 is guided from the first cooling water outlet 48 of the chamber to a water pump by a hose (not shown). The remaining cooling water enters the fourth chamber 45 through the throttle hole 47 of the bypass plate 46, and flows therefrom through the sub-cooling unit 33 in the direction opposite to the direction of the main cooling unit 32 as shown by the arrow D, to the first tank 34. to go into. The cooling water that has entered the second chamber 42 of the first tank 34 is discharged from a second cooling water outlet 49. The cooling water discharged from the second cooling water outlet 49 is guided to, for example, an oil cooler by a hose (not shown) and used for cooling the oil.

When the radiator 30 and the condenser 10 are installed in the engine room, the dividing line b between the main cooling section 32 and the sub-cooling section 33 of the radiator 30 corresponds to the upstream cooling section 12 and the downstream cooling section of the condenser 10. The height is set so as to be substantially the same as the division line a between 13.
That is, the main cooling part 32 of the radiator 30 and the upstream cooling part 12 of the condenser 10 are aligned and overlap with each other, and the sub cooling part 33 of the radiator 30 and the downstream cooling part 13 of the condenser 10 are also aligned and overlap with each other. . And
In the upstream cooling unit 12 of the condenser 10 and the main cooling unit 32 of the radiator 30, the refrigerant and the cooling water flow from the left side to the right in the figure, and in the downstream cooling unit 13 and the sub cooling unit 33, the refrigerant and the cooling water both flow from the right side. It flows to the left.

In the downstream cooling section 13 of the condenser 10, the refrigerant is cooled to about 50 ° C. On the other hand, radiator 3
At 0, the cooling water is cooled to about 80 ° C. in the main cooling section 32. Then, the cooling water other than that discharged from the first cooling water outlet 48 flows to the sub-cooling unit 33 and is further cooled. Here, since the flow rate of the cooling water entering the sub-cooling unit 33 is reduced by passing through the throttle hole 47 of the bypass plate 46, the cooling effect is large in the sub-cooling unit 33 and the cooling water is also reduced to 60%.
It is cooled down to about 50 ° C.

In the downstream cooling unit 13 of the condenser 10 and the sub-cooling unit 33 of the radiator 30, the refrigerant and the cooling water flow in the same direction, so that the downstream cooling unit 13 and the sub-cooling unit 3
The temperature of the air passing through 3 and entering the engine room gradually decreases from the left side on the upstream side to the downstream side according to the passage portion. Thereby, the passing air temperature in the lower half of 50 ° C. is obtained on the lower side.

The present embodiment is constructed as described above. In the condenser 10 and the radiator 30 in which the respective heat exchange regions 11 and 31 are arranged one after another, the heat exchange region 31 of the radiator 30 A main cooling section 32 and a sub-cooling section 33 are defined corresponding to the upstream cooling section 12 and the downstream cooling section 13 of the exchange area 11, and the cooling water and the refrigerant in the upstream cooling section 12 and the main cooling section 32 are arranged at the upper part. In the lower part, the flow directions of the cooling water and the refrigerant in the downstream cooling unit 13 and the sub-cooling unit 33 are the same, and in the radiator 30, the sub-cooling unit 3
Since the flow rate of the cooling water to the cooling water 3 is reduced by the throttle hole 47, the temperature of the air passing through the downstream cooling portion 13 of the condenser 10 and the sub cooling portion 33 of the radiator 30 and entering the engine room is remarkably reduced. Can be reduced.
Thereby, the heat damage is prevented by directing the low-temperature air to the vicinity of the high-temperature equipment in the engine room.

The upstream cooling section 12 and the main cooling section 3
2, the lane markings a of the downstream cooling unit 13 and the sub cooling unit 33,
Since the height of b is matched between the radiator 30 and the condenser 10, the high-temperature side air that has passed through one main cooling section or upstream cooling section and the low-temperature side air that has passed through the other sub cooling section or downstream cooling section. There is no air mixing and the lowest possible temperature of the passing air can be achieved.

FIG. 5 shows a modification of the embodiment. This is a composite heat exchanger 1 in which the radiator 30 and the condenser 10 are integrated. In this combined heat exchanger 1, as shown in FIG. 6, which is a cross-sectional view of the heat exchange region,
Cooling passages 18 and 3 of condenser 10 and radiator 30
A fin 4 extending over the fin 4
Connects the cooling passages 18 and 38. Although not particularly illustrated, the heat exchange areas of the condenser 10 and the radiator 30 are divided into an upper upstream cooling section 12 and a main cooling section 32 and a lower downstream cooling section 13 and a sub cooling section 33, respectively. Other configurations remain the same.

Also in this modification, the temperature of the air passing through the downstream cooling section 13 of the condenser 10 and the sub cooling section 33 of the radiator 30 and entering the engine room can be remarkably reduced. The heat damage is prevented by directing the air to the vicinity of the high heat equipment in the engine room. In addition, since the flow directions in the downstream cooling section of the condenser and the sub-cooling section of the radiator are the same, and the temperatures of the cooling water and the refrigerant change at the same level along the flow, both cooling passages 18 and 38 are formed by the fins 4. Even if the air conditioner is connected, the coolant is not heated by the cooling water, and the performance of the air conditioner does not deteriorate.

FIG. 7 shows a second embodiment. This figure is a view corresponding to FIG. 4 showing the radiator according to the first embodiment. The radiator 30 ′ includes a heat exchange area 31 in which a plurality of cooling passages 38 are connected between the first tank 34 and the second tank 36, and a main cooling section 32 having a large ventilation area at the top.
And a sub cooling unit 33 having a small ventilation area at the bottom.

The inside of the first tank 34 is divided by a partition plate 35 into a first chamber 41 communicating with the main cooling section 32 and a second chamber 42 communicating with the sub cooling section 33. Inside the second tank 36, the main cooling section 32 and the sub cooling section 3 in the heat exchange area 31 are arranged.
A partition plate 50 is provided at a position lower than the dividing line b of the third cooling line 33 so as to divide the sub cooling unit 33 into two, and a fifth chamber 51 communicating with a part of the sub cooling unit 33 and the main cooling unit 32 is provided. It is partitioned into a sixth chamber 52 that communicates with the rest of the section 33. Room 5
The first cooling water outlet 4 is located at a position higher than the lane marking b.
8 is provided, and the sixth chamber 52 is provided with a second cooling water outlet 49.

As a result, in the sub-cooling section 33 of the radiator 30 ', an arrow D is sent from the fifth chamber 51 to the sub-cooling section 33.
The cooling water flowing as described above is supplied to the second chamber 42 of the first tank 34.
And flows through the sub-cooling section 33 again as shown by the arrow E, reaches the sixth chamber 52 of the second tank 36, and then
From the cooling water outlet 49. Due to the turning back, the flow path length of the cooling water in the sub cooling unit 33 is doubled, and the flow velocity of the cooling water in the sub cooling unit 33 is reduced due to the flow path resistance.

The number of cooling passages 38 connected to the fifth chamber 51 of the sub-cooling section 33 is set smaller than the number of cooling passages 38 connected to the lower sixth chamber 52. Thereby, the flow path resistance of the cooling water passage in the main cooling unit 32 and the sub cooling unit 33 is adjusted, and a preferable flow rate distribution is achieved, and the cooling efficiency is improved. Other configurations including the capacitor 10 are the same as those of the first embodiment. Sub-cooling unit 3 of radiator 30 '
3 and the downstream cooling part 13 of the condenser 10 are arranged so as to be aligned with each other and overlap.

The present embodiment is configured as described above, and the length of the cooling water flow path in the sub-cooling section 33 of the radiator 30 'is lengthened by folding, so that the temperature of the cooling water in the sub-cooling section 33 is further reduced. Can be done.

As a capacitor, as shown in FIG.
In the case where the condenser 10 'having a liquid tank is used, it is preferable that the sub-cooling part in the heat exchange area through which the refrigerant from the liquid tank flows is set as the downstream cooling part, and the sub-cooling part 33 of the radiator is overlapped with this. Capacitor 1
At 0 ', the refrigerant from the first chamber 21 of the first gallery 14 passes through the first chamber 16a of the upstream-side cooling section second gallery 16 and the second chamber 22 of the first gallery 14, and indicates the heat exchange area 11 by an arrow. One and a half reciprocations like A, B and J flow to the second chamber 16b of the second gallery 16, and the liquefied refrigerant then temporarily enters the liquid tank 55 attached to the second gallery 16. Then, the refrigerant is supplied from the liquid tank 55 to the second gallery 16.
After passing through the third chamber 16c, the subcool part 60 in the heat exchange area
Flows to the third chamber 27 of the first gallery 14 as shown by arrow K. In this example, the subcool unit 60 is defined as the downstream cooling unit in the present invention, and the region in which the refrigerant flows in arrows A, B, and J is the upstream cooling unit.

In each embodiment, the radiator 3
Although an example in which the 0, 30 'and the condenser 10 are arranged at the front end of the engine room has been described, the present invention is not limited to this, and it is also possible to arrange them at the side as needed. In each figure, the inlets (23, 43) of the cooling water and the refrigerant to the condenser and the radiator are on the left side, but can be changed to the right side in accordance with the piping layout in the engine room.

[0031]

As described above, the present invention relates to a vehicle heat exchanger comprising a radiator and a condenser in which the respective heat exchange areas are arranged one after another in a front-to-rear direction. The radiator is divided into a cooling section and a radiator.The heat exchange area is divided into a main cooling section and a sub-cooling section, and the cooling water returns from the main cooling section to the sub-cooling section and flows in a direction opposite to the flow in the main cooling section. Since the heat exchange area of the condenser and the heat exchange area of the radiator are arranged so as to overlap with each other, and the sub-cooling section of the radiator and the downstream cooling section of the condenser are opposed to each other, the air passing through the downstream cooling section of the condenser is radiator. , The temperature of the air passing through the downstream cooling section and the sub-cooling section and entering the engine room can be reduced. Therefore, by directing the low-temperature air to the vicinity of the high-temperature equipment, heat damage in the engine room is prevented.

Similarly, in the case of a composite heat exchanger in which integral fins are stretched and connected to the cooling passages of the radiator and the condenser, the refrigerant may be reheated to lower the performance of the air conditioner. Absent. If the boundary between the main cooling section and the sub-cooling section of the radiator is set at the same height as the boundary between the upstream cooling section and the downstream cooling section of the condenser, the radiator has passed one main cooling section or the upstream cooling section. Since there is no mixing of the high-temperature side air and the low-temperature side air that has passed through the other sub-cooling section or the downstream-side cooling section, the minimum passing air temperature can be realized.

Also, first ends are provided at both ends of the cooling passage of the radiator.
The tank and the second tank are connected, and the first tank is divided into a first chamber communicating with the main cooling unit by a partition plate and a second chamber communicating with the sub cooling unit, and a cooling water inlet is provided in the first chamber. The second room has a second
The inside of the second tank is divided into a third chamber communicating with the main cooling section and a fourth chamber communicating with the sub-cooling section by a bypass plate having a throttle hole. By providing the first cooling water outlet, most of the cooling water flowing through the main cooling portion is discharged from the first cooling water outlet, and the remaining portion is reduced in flow velocity by the throttle hole to enter the sub cooling portion. Cooling is particularly pronounced in the area.

Alternatively, the first tank is divided by a partition into a first chamber communicating with the main cooling section and a second chamber communicating with the sub-cooling section, and a cooling water inlet is provided in the first chamber. The inside of the tank is partitioned by a partition into a fifth chamber communicating with a part of the sub-cooling unit and the main cooling unit, and a sixth chamber communicating with the rest of the sub-cooling unit. By providing a water outlet and a second cooling water outlet in the sixth chamber, the cooling water is supplied to the fifth cooling water in the sub-cooling section.
After flowing from the chamber to the second chamber, it is turned back and further flows to the sixth chamber, and the flow path length of the cooling water is doubled, so that the temperature of the cooling water in the sub-cooling section can be further reduced.

At this time, by setting the sectional area of the cooling passage communicating with the fifth chamber in the sub-cooling section smaller than the sectional area of the cooling passage communicating with the sixth chamber, the cooling in the main cooling section and the sub-cooling section is performed. The flow path resistance of the water channel is adjusted, so that a preferable flow rate distribution is achieved, and the cooling efficiency is improved.

[Brief description of the drawings]

FIG. 1 is a plan view showing an embodiment of the present invention.

FIG. 2 is a perspective view of an embodiment in which a radiator and a condenser are separated from each other.

FIG. 3 is a partial cross-sectional front view showing the structure of the capacitor.

FIG. 4 is a partial cross-sectional front view showing the structure of the radiator.

FIG. 5 is a transverse sectional view showing a modification of the embodiment.

FIG. 6 is a sectional view taken along the line FF in FIG. 5;

FIG. 7 is a diagram showing a second embodiment.

FIG. 8 is a diagram showing a modification of the capacitor.

FIG. 9 is a diagram showing a conventional example.

[Explanation of symbols]

 4, 19, 39 Fin 10 Condenser 11, 31 Heat exchange area 12, 32 Main cooling section 13, 33 Sub cooling section 14 First gallery 15 Separator 16 Second gallery 16a First chamber 16b Second chamber 16c Third chamber 18 , 38 Cooling passage 21 First chamber 22 Second chamber 27 Third chamber 23, 24 Connector 30, 30 'Radiator 31 Heat exchange area 34 First tank 35, 50 Separator 36 Second tank 41 First chamber 42 Second chamber 43 cooling water inlet 44 third chamber 45 fourth chamber 46 bypass plate 47 throttle hole 48 first cooling water outlet 49 second cooling water outlet 51 fifth chamber 52 sixth chamber 55 liquid tank 60 subcool section

Claims (5)

[Claims] 1. A heat exchange region in which cooling passages are arranged in a lateral direction is divided into upper and lower upstream cooling portions and a downstream cooling portion. The air conditioner condenser including the reverse flow and the heat exchange area where the cooling passages are arranged in the horizontal direction are divided into upper and lower main cooling units and sub cooling units, and the cooling water flows in one direction in the main cooling unit. And a radiator for cooling the engine including a flow in the reverse direction in the sub-cooling section after the flow of the sub-cooling section, the heat exchange area of the condenser and the heat exchange area of the radiator are arranged in an overlapping manner, and the sub cooling section of the radiator A heat exchanger for a vehicle, wherein a downstream cooling part of a condenser is opposed. 2. A radiator according to claim 1, wherein a boundary between the main cooling section and the sub-cooling section is set at the same height as a boundary between the upstream cooling section and the downstream cooling section of the condenser. Heat exchanger for vehicles. 3. The radiator is configured such that one end of the cooling passage is connected to a first tank, and the other end of the cooling passage is connected to a second tank, and the first tank is connected to a main cooling unit by a partition plate. It is divided into a first chamber that communicates with a second chamber that communicates with the sub-cooling unit, and the inside of the second tank communicates with a third chamber that communicates with the main cooling unit and a sub-cooling unit by a bypass plate having a throttle hole. A first cooling water outlet is provided in the third chamber, a cooling water inlet is provided in the first chamber of the first tank, and a second cooling water is provided in the second chamber. The vehicle heat exchanger according to claim 1, wherein a water outlet is provided. 4. The radiator is configured such that one end of the cooling passage is connected to a first tank and the other end of the cooling passage is connected to a second tank, and the first tank is connected to a main cooling unit by a partition plate. The first chamber is divided into a first chamber communicating with the sub-cooling unit, and a cooling water inlet is provided in the first chamber, and a part of the sub-cooling unit is formed in the second tank by a partition plate. And a fifth chamber communicating with the main cooling section and a sixth chamber communicating with the rest of the sub-cooling section. The fifth chamber is provided with a first cooling water outlet, and the sixth chamber has a first cooling water outlet. The vehicle heat exchanger according to claim 1 or 2, wherein two cooling water outlets are provided. 5. A cross-sectional area of a cooling passage communicating with the fifth chamber in the sub-cooling section is set smaller than a cross-sectional area of a cooling passage communicating with the sixth chamber. 4. The heat exchanger for vehicles according to 4.