JP2002115991A - Heat exchanger - Google Patents

Abstract

PROBLEM TO BE SOLVED: To enhance assembling workability of a heat exchanger integrating two types of heat exchanger. SOLUTION: A dummy tube 140 disposed at the boundary of first and second radiators 110 and 120 has dimensions (shape) identical to those of first and second tubes 111 and 121 and fins 141 disposed between the dummy tubes 140 has dimensions (shape) identical to those of first and second fins 112 and 122. Since a heat exchanger can be assembled while stacking the tubes and fins sequentially without discriminating the dummy tube 140 from the first and second tubes 111 and 121 and the first and second fins 112 and 122 from the fins 141, assembling workability of heat exchanger can be enhanced.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a heat exchanger in which two kinds of heat exchangers are integrated, and is effective and suitable for a hybrid vehicle or the like that runs by combining an internal combustion engine and an electric motor.

[0002]

2. Description of the Related Art In a hybrid vehicle, generally, a first radiator for cooling engine cooling water circulating in an engine (internal combustion engine) and an electric cooling water for circulating in an electric motor and an electric control circuit thereof are cooled. And two types of radiators including a second radiator.

[0003] Incidentally, the engine cooling water and the electric system cooling water are different in proper cooling water temperature and water pressure.
If both cooling waters are cooled by one radiator, the cooling efficiency deteriorates, which is not a good idea.

On the other hand, Japanese Patent Application Laid-Open No. 10-111086 discloses
In the invention described in the above publication, in a radiator composed of a plurality of tubes through which cooling water flows and a header tank disposed at the longitudinal end of the tubes and communicating with each tube, a separator ( The partition by the partition wall separates a portion through which the engine cooling water flows and a portion through which the electric cooling water flows, and radiator for the engine cooling water (hereinafter, referred to as first radiator) and for the electric cooling water. (Hereinafter, referred to as a second radiator).

[0005]

However, according to the invention described in the above publication, a heat insulating area where no cooling fin is provided is provided between the first radiator and the second radiator, and the heat insulating area is provided. Is provided with a joining plate having a different shape and size from the cooling fins.

For this reason, in the invention described in the above publication, when assembling the radiator, it is necessary to specify the place where the joining plate is disposed when sequentially stacking the tubes and the cooling fins, so that the radiator is assembled. In this case, there is a problem that workability in assembly is low.

SUMMARY OF THE INVENTION In view of the above, an object of the present invention is to improve the assembling workability in a heat exchanger in which two types of heat exchangers are integrated.

[0008]

According to the present invention, in order to achieve the above object, a plurality of first tubes (111) through which a first fluid flows, and a first tube are provided. A first fin (112) for promoting heat exchange disposed between (111), a plurality of second tubes (121) through which the second fluid flows, and a second tube (121). A second fin (122) for promoting heat exchange, a header tank (130) disposed at both longitudinal ends of both tubes (111, 121), and communicating with both tubes (111, 121); A first space (131) communicating the space in the (130) with the first tube (111);
And the second space (13) communicating with the second tube (121).
2) and at least two separators (134) constituting a third space (133) between the first space (131) and the second space (132), and both tubes (111, 121). And at least two dummy tubes (140) connecting the third space corresponding portion (130d) on one end side in the longitudinal direction and the third space corresponding portion (130d) on the other end side, and are disposed between the dummy tubes (140). Fins (141), and first and second tubes (1).
11, 121) and the dummy tube (140) have the same dimensions, and the first and second fins (112, 122)
And the fin (141) have the same dimensions.

Accordingly, when assembling the heat exchanger,
The dummy tube (140) and the first and second tubes (11
1, 121) and the first and second fins (112, 122).
The tubes and the fins can be assembled while being sequentially laminated without distinguishing the fins and the fins (141), so that the workability of assembling the heat exchanger can be improved.

According to the second aspect of the present invention, the third space (133) and the header tank (130) are provided in the third space corresponding portion (130d) of the header tank (130) corresponding to the third space (133). ) Hole for communication with outside (135)
Is provided.

Thus, for example, the first space (131)
(134) separating the first space and the third space (133)
If there is a poor seal (poor bonding) in the second space (13),
2) It leaks out through the hole (135) without entering the inside.

Further, if there is a poor seal (poor bonding) at a location other than the separator (134) that separates the first space (131) and the third space (133), the inspection fluid is supplied from the defective location. Leak outside.

Therefore, according to the present invention, a leak test of a heat exchanger in which two types of heat exchangers are integrated can be easily performed.

According to the third aspect of the present invention, both tubes (111, 121) are provided so as to extend in the vertical direction, and a hole (135) is formed in the lower header tank (130). It is characterized by being provided.

This makes it possible to prevent rainwater or the like from entering the header tank (130) from the hole (135), thereby preventing the heat exchanger from being corroded by rainwater or the like. it can.

Incidentally, the reference numerals in parentheses of the above means are examples showing the correspondence with specific means described in the embodiments described later.

[0017]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS In the present embodiment, the heat exchanger according to the present invention is applied to a radiator for a hybrid vehicle. FIG. 1 shows a radiator 100 according to the present embodiment.
It is a perspective view of.

An engine cooling water (first fluid) 111 circulates through the engine (not shown) to cool the engine.
Is the first tube made of aluminum that is distributed, and 12
1 is a second aluminum tube that circulates in an electric control circuit for controlling an electric motor such as an electric motor and an inverter circuit and through which an electric cooling water (second fluid) for cooling the electric motor and the electric control circuit flows. It is.

Here, the first tube 111 is connected to the first tube 111 in FIG.
Are provided in the range shown in FIG.
A plurality of tubes are provided in a range shown in FIG. 1B, and both tubes 11 and 121 have the same dimensions (the same shape).

Between the first tube 111 and the second tube 121, first and second cooling fins (heat transfer fins) 112, 122 of the same size (same shape) which are formed in a wave shape to promote heat exchange. These cooling fins (hereinafter, abbreviated as fins) 112 and 122 are brazed to the tubes 111 and 121, respectively.

A header tank 130 communicating with each of the first and second tubes 111 and 121 is disposed on both ends in the longitudinal direction of the tubes 111 and 121. Tank 1
Two separators (partition walls) 134 are provided to partition the space inside 30 into three spaces 131 to 133.

Here, the space 131 (hereinafter, the first space 13)
Called 1. ) Communicates with the first tube 111,
The engine cooling water is distributed and supplied from the first space 131 on the upper side to each of the first tubes 111, and the first space 131 on the lower side is
Collects and collects engine cooling water after heat exchange.

A space 132 (hereinafter, a second space 132)
Call. ) Is in communication with the second tube 121, and the electric cooling water is distributed and supplied to the second tubes 111 from the upper second space 132, and the heat exchange is completed by the lower second space 132. Collect and collect system cooling water.

Therefore, the radiator 100 shown in FIG.
The range indicated by A is the first radiator 1 for engine cooling water.
1 and the range shown in FIG. 1B constitutes the second radiator 120 for the electric cooling water.

Reference numeral 113 denotes an engine cooling water inlet, 114 denotes an engine cooling water outlet, and 123 denotes an engine cooling water outlet.
Is an inlet of the electric cooling water, and 124 is an outlet of the electric cooling water.

As shown in FIG. 2, the header tank 130 is made of an aluminum core plate 1 in which the longitudinal ends of both tubes 111 and 121 are joined by brazing.
30a and the header tank 1 together with the core plate 130a
And a tank body 130b made of resin which forms a space in the inside 30.

The two members 130a and 130b are sandwiched by a packing 130c for ensuring airtightness.
The core plate 130a is fixed by caulking by bending (plastically deforming) a part of the core plate 130a.

The separator 134 is connected to the tank body 1.
The separator 134 and the core plate 134 are integrally formed with the packing 13 as shown in FIG.
0c is a watertight seal. And
As shown in FIG. 1, the third space 133 of the lower header tank 130 (tank main body 130 b) has a hole 13 for communicating the third space 133 with the outside of the header tank 130.
5 are formed.

Incidentally, a portion of the core plate 130a (header tank 130) corresponding to the third space 133 (hereinafter, this portion is referred to as a third space corresponding portion) 130.
d, as shown in FIG. 3, the first and second tubes 111,
Dummy tube 1 having the same dimensions (same shape) as 121
40 are joined.

As shown in FIG. 1, fins 112 and 122 are provided between the dummy tubes 140, between the dummy tubes 140 and the first tubes 111, and between the dummy tubes 140 and the second tubes 121. Fins 141 having the same size (same shape) are provided, and these fins 141 are also used for the tubes 111, 121, 140.
Brazed.

Incidentally, in this embodiment, the fins 141 are used.
As described below, is provided solely for the purpose of improving mechanical strength, and does not expect much heat transfer (radiation) effect.

Next, an outline of a method of inspecting the radiator 100 for leakage will be described.

1. In the case of inspecting the first radiator 110 With the outlet 114 closed, He
The gas is charged at a predetermined pressure. When the He gas is detected outside the first radiator 110, it is considered that there is a leak (poor bonding (poor sealing)) at any part of the first radiator 110, and the outside of the first radiator 110 is detected. Therefore, when He gas cannot be detected, it is assumed that there is leakage (poor bonding (poor sealing)) in any part of the first radiator 110.

2. In the case of inspecting the second radiator 120 With the outlet 124 closed, He is supplied from the inlet 123.
The gas is charged at a predetermined pressure. When He gas is detected outside the second radiator 120, it is considered that there is a leak (poor bonding (poor sealing)) at any part of the second radiator 120, and the outside of the second radiator 120 is detected. When the He gas cannot be detected, it is considered that there is a leak (poor bonding (poor seal)) at any part of the second radiator 120.

In this example, the outlets 114, 124
Is closed and He gas is filled from the inflow ports 113 and 123. On the contrary, the He gas may be filled from the outflow ports 114 and 124 by closing the inflow ports 113 and 123.

Next, the features of this embodiment will be described.

In this embodiment, the dummy tube 140 and the first and second tubes 111 and 121 have the same size (same shape), and the first and second fins 112 and 122 and the fin 141 have the same size (same shape). ), The dummy tube 140 and the first and second tubes 111 and 121 are connected to the first and second fins 1 when assembling the heat exchanger.
The tubes and the fins can be assembled while being sequentially laminated without distinguishing the fins 141 from the tubes 12, 122, so that the workability of assembling the heat exchanger can be improved.

The first and second tubes 1 are used as strength members.
Since the dummy tubes 140 having the same dimensions as the first and second fins 112 and 122 are used and the fins 141 having the same dimensions as the first and second fins 112 and 122 are joined, the header tank 130 (the tank body) 130
The radiator 100 according to the present embodiment can be assembled in the same process (line) as a normal radiator having no separator 134 except for changing b).

Therefore, a radiator in which two types of radiators are integrated can be assembled without largely changing the production line (production process).

A third space 133 partitioned by a separator 134 is formed between a first space 131 forming the header tank of the first radiator 110 and a second space 132 forming the header tank of the second radiator 120. In addition, since the third space 133 is formed with the hole 135 that allows the third space 133 to communicate with the outside of the header tank 130, when the first radiator 110 is inspected for leaks, for example, When the separator 134 that separates the space 131 from the third space 133 has a bad seal, the He gas leaked from the bad seal portion is removed from the second space 13.
Without leaking into the inside 2, it leaks out from the hole 135.

It is assumed that the first space 131 and the third space 1
If there is a poor seal (poor bonding) at a place other than the separator 134 that separates the He gas from the 33, the He gas leaks out from the bad place.

As described above, according to the present embodiment, the first and second radiators 110 and 120 can be easily inspected for leaks.
A leak test of the radiator 100 in which the radiators 0 and 120 are integrated can be easily performed.

Further, since the hole 135 is provided in the header tank 130 on the lower side, it is possible to prevent rainwater or the like from entering the header tank 130 from the hole 135 beforehand. Therefore, it is possible to prevent the heat exchanger from being corroded by rainwater or the like beforehand.
00 can be prevented from being reduced in durability.

Since the engine cooling water and the electric system cooling water have different proper temperatures, the first tube 111
Is different from the amount of thermal expansion of the second tube 121, and compressive stress or tensile stress (hereinafter, these stresses are referred to as thermal stress) is generated in the first and second tubes 111 and 121. Would.

On the other hand, in the present embodiment, the first and second
Third space corresponding portion 13 located between spaces 131 and 132
0d functions as a portion for relaxing thermal stress generated in the first and second tubes 111 and 121.

Therefore, the thermal stress caused by the difference between the thermal expansion of the first tube 111 and the thermal expansion of the second tube 121 can be reduced, and the tube can be prevented from cracking.

In the third space corresponding portion 130d, the fins 141 and 11 are also provided between the dummy tubes 140 and between the dummy tubes 140 and the tubes 111 and 121.
Since 2, 122 are joined, the rigidity of the entire core is not impaired.

(Other Embodiments) In the above embodiment, the heat exchanger according to the present invention is applied to a hybrid vehicle, but the present invention is not limited to this, and may be applied to other ones. Can be.

In the above embodiment, the fin 141
Although the present invention is not limited to this,
The fin 141 may be eliminated.

In the above-described embodiment, He gas is used as the fluid for leak inspection. However, the present invention is not limited to this, and other gases or liquids may be used.

[Brief description of the drawings]

FIG. 1 is a perspective view of a radiator according to an embodiment of the present invention.

FIG. 2 is a sectional view of a header tank of the radiator according to the embodiment of the present invention.

FIG. 3 is a sectional view of a header tank of the radiator according to the embodiment of the present invention.

[Explanation of symbols]

100: radiator, 110: first radiator, 111
... first tube, 112 ... first fin, 120 ... second tube, 121 ... second tube, 122 ... second fin,
130: header tank, 140: dummy tube, 14
1 ... fins.

Claims (3)

[Claims] 1. A plurality of first tubes (111) through which a first fluid flows; a first fin (112) disposed between the first tubes (111) to promote heat exchange; A plurality of second tubes (121) through which fluid flows
A second fin (122) disposed between the second tubes (121) for promoting heat exchange; and a second fin (122) disposed at both longitudinal ends of the tubes (111, 121). 111, 121), a first space (131) communicating the space in the header tank (130) with the first tube (111), and the second space (131).
At least two sheets partitioning into a second space (132) communicating with the tube (121) and forming a third space (133) between the first space (131) and the second space (132). At least two dummy connecting the separator (134) and the third space corresponding portion (130d) at one longitudinal end of the tubes (111, 121) and the third space corresponding portion (130d) at the other end. A tube (140); and fins (141) disposed between the dummy tubes (140). The first and second tubes (111, 121) and the dummy tubes (140) have the same dimensions. The heat exchanger, wherein the first and second fins (112, 122) and the fins (141) have the same dimensions. 2. A third space corresponding portion (13) of the header tank (130) corresponding to the third space (133).
0d) is provided with a hole (135) for communicating the third space (133) with the outside of the header tank (130). 3. The two tubes (111, 121)
The heat exchanger according to claim 2, wherein the heat exchanger is provided so as to extend in a vertical direction, and the hole (135) is provided in the lower header tank (130).