JP2007078214A - Heat exchanger for automobile - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a heat exchanger for an automobile capable of preventing the cracking and breakage of a tube by relaxing thermal stress applied to the base of the tube. <P>SOLUTION: In this heat exchanger A for the automobile wherein a plurality of tubes 4 having cross sections each composed of a pair of flat portions 4a, 4b opposite to each other in parallel and a pair of curved portions 4c, 4d connecting both ends of the flat portions 4a, 4b, and formed into the flat cylindrical shape, and a plurality of corrugated fins 5 are alternately arranged between a pair of tanks 1, 2, and both ends of each tube is inserted and fixed to the corresponding tank 1(2), thermal stress relaxation members 10 are fixed to both flat portions 4a, 4b of the tube 4, respectively, and the wall 8 of the tank 1 (2) near the outer side of the tank 1(2) of the base 6 with the tank 1 (2) of the tube. <P>COPYRIGHT: (C)2007,JPO&amp;INPIT

Description

  The present invention relates to an automotive heat exchanger.

2. Description of the Related Art Conventionally, in an automobile heat exchanger, a plurality of tubes and fins are alternately arranged between a pair of tanks, and both end portions of each tube are inserted and fixed in corresponding tanks (Patent Documents 1 and 2). reference).
JP 2005-3226 A JP 2005-37061 A

  However, in the conventional invention, the wind is good because the vehicle running wind or the forced wind by the fan does not uniformly hit all the tubes depending on the position of the bumper armature of the vehicle, the opening of the front grill, etc. There is a problem that a temperature difference occurs between the tube that hits and the tube that doesn't hit so much that the thermal stress concentrates on the base of the tube with the tank (hereinafter abbreviated as tube base), causing cracks and breakage. It was.

  The present invention has been made in order to solve the above-mentioned problems, and an object of the present invention is to provide a heat exchanger for an automobile that can prevent cracking and breakage of the tube by relaxing thermal stress applied to the base of the tube. Is to provide.

  According to the first aspect of the present invention, a pair of flat portions opposed in parallel with each other and a cross section in which both ends of the flat portions are connected by a pair of curved portions are formed into a flat cylindrical shape. In an automotive heat exchanger in which a plurality of tubes and wavy fins are alternately arranged between a pair of tanks, and both end portions of each tube are inserted and fixed in the corresponding tanks, the tank in the tube In the vicinity of the outer side of the tank at the base, both flat portions of the tube and a thermal stress relaxation member fixed to the tank are provided.

  In the invention according to claim 1 of the present invention, a flat cylinder having a cross section in which a pair of flat portions opposed in parallel to each other and both ends of the flat portions are connected by a pair of curved portions is provided. In an automobile heat exchanger in which a plurality of formed tubes and wavy fins are alternately arranged between a pair of tanks, and both end portions of the tubes are inserted and fixed in corresponding tanks, the tubes can be disposed In the vicinity of the outside of the tank at the base of the tank, both the flat portions of the tube and the thermal stress relaxation member fixed to the tank are provided. Therefore, the thermal stress applied to the base of the tube can be dispersed in the thermal stress relaxation member. Can be prevented from cracking or breaking.

  Embodiments of the present invention will be described below with reference to the drawings.

Example 1 will be described below.
In the first embodiment, the case where the automotive heat exchanger is applied to a radiator will be described.
1 is a front view showing a heat exchanger for an automobile according to a first embodiment of the present invention, FIG. 2 is a perspective view thereof, FIG. 3 is a perspective sectional view in the vicinity of a range X in FIG. 2, and FIG. FIG. 5 is a diagram for explaining the inside of the tank of the first embodiment, and FIG. 6 is a perspective view of the thermal stress relaxation member of the first embodiment.
7 is a perspective enlarged sectional view taken along the arrow Y in FIG. 3, and is a diagram for explaining the operation (fins are omitted). FIG. 8 is a diagram for explaining the temporary fixing of the thermal stress relaxation member of the first embodiment. These are the figures explaining the mounting to the vehicle of the heat exchanger for motor vehicles of the present Example 1. FIG.

First, the overall configuration will be described.
As shown in FIGS. 1 and 2, the heat exchanger A for an automobile according to the first embodiment includes a pair of tanks 1 and 2 that are spaced apart from each other by a predetermined distance in the vehicle width direction. The core part 3 arrange | positioned at is provided.

  A vehicle mounting pin P for mounting on a radiator core support (not shown) projects from the tank vertical ends of the tanks 1 and 2, and an input / output projecting to the rear of the vehicle at the upper part of the tank 1. The port P1 is provided in a state where it communicates with the inside of the tank 1, and an input / output port P2 that protrudes toward the rear of the vehicle is provided in a state where it communicates with the inside of the tank 2.

The core portion 3 includes a plurality of tubes 4 that are inserted into and fixed to the corresponding tanks 1 and 2 at both ends, and a plurality of fins 5 that are alternately arranged with the tubes 4.
The core 3 is connected and reinforced by a pair of reinforcements R1 and R2 whose both ends are inserted and fixed in the corresponding tanks 1 and 2, respectively.

As shown in FIGS. 3 and 4, each tube 4 of the core portion 3 includes a pair of flat portions 4a and 4b opposed in parallel to each other, and both ends of the flat portions 4a and 4b are a pair of curved portions 4c and 4d. A so-called flat tube having a cross-section connected to each other and formed into a flat cylindrical shape is employed.
The tube 4 may be a so-called B-type flat tube having a partition at the center of the inside.

Further, as shown in FIG. 5, the base 6 of each tube is brazed and fixed to a cylindrical portion 7 that protrudes inward from the side wall 9 of the corresponding tank 1 (2).
Further, the core portion 3 is disposed at a position offset from the center of the tanks 1 and 2 to the vehicle front side due to the layout of the peripheral members, whereby the cylindrical portion 7 and the side walls 8 of the tanks 1 and 2 are close to each other. It is in the state.
The core portion 3 is not necessarily arranged at a position offset from the center of the tanks 1 and 2 to the vehicle front-rear side.

  The fin 5 employs a so-called corrugated structure having a plurality of louvers 5a between the wave-like top and valleys, and a predetermined gap is formed between the both ends of the wall 5 of the tanks 1 and 2. ing.

And the thermal stress relaxation member 10 mentioned later is mounted | worn with the predetermined clearance mentioned above in the both sides of the heat exchanger A for motor vehicles.
As shown in FIGS. 6 and 7, the thermal stress relaxation member 10 is composed of a comb-like plate material having a plurality of fitting grooves 10 a opened to the front side of the vehicle in the number of the tubes 4. It is brazed and fixed X1 to the side wall 9 of 2).
In addition, although the deepest part 10b of the fitting groove | channel 10a of the present Example 1 is formed in semicircle shape, rectangular shape may be sufficient and it is not this limitation.

Further, both the curved portions 4c and 4d of each tube 4 are not in contact with the fitting groove 10a, and both the flat portions 4a and 4b are brazed and fixed X2 to the fitting groove 10a.
As shown in FIG. 3, the fin 5 and the thermal stress relaxation member 10 are not in contact with each other in the first embodiment, but this is not restrictive.

  Further, in the automotive heat exchanger A, all the constituent members including the thermal stress relaxation member 10 are made of aluminum, and at least one of the joint portions of the constituent members is a clad layer (brazing sheet) made of a brazing material. These are preliminarily assembled and then heat-treated in a heating furnace (not shown) to braze each part integrally.

Next, the operation will be described.
When manufacturing the automotive heat exchanger A configured as described above, all the structural members except for the thermal stress relaxation member 10 are preliminarily assembled, and then, as shown in FIG. On both tanks 1 and 2 side, the thermal stress relaxation member 10 is inserted between the tank 1 (2) and the fin 5 from the rear side of the vehicle and temporarily fixed.
At this time, the thermal stress relaxation member 10 is brought into contact with the side wall 9 of the tank 1 (2) and fitted so that the flat portions 4a and 4b of the tubes 4 are sandwiched between the fitting grooves 10a. Both can be securely fixed securely, and rattling and falling off can be prevented.
In the first embodiment, the fitting groove 10a and the curved portions 4c, 4d of the tube 4 are not in contact with each other. Of the curved portions 4c, 4d of the tube 4, the curved portion 4d on the rear side of the vehicle is used. When the contact is made with the deepest portion 10b of the fitting groove 10a, positioning at the time of insertion of the thermal stress relaxation member 10 can be facilitated.
Although it is more effective for the thermal stress described later to place both curved portions 4c and 4d of the tube 4 in a non-contact state with the fitting groove 10a, at least one of the curved portions 4c and 4d is fitted into the fitting groove 10a. Even if it is non-contact, the effect on thermal stress can be obtained.

Next, the automobile heat exchanger A, on which the thermal stress relaxation member 10 is temporarily fixed, is transported to a heating furnace (not shown) and subjected to heat treatment to braze and fix each part to complete the manufacture of the automobile heat exchanger A. To do.
At this time, the thermal stress relaxation member 10 is brazed and fixed X1 to the side wall 9 of the tank 1 (2), and at the same time, the fitting groove 10a is brazed and fixed X2 to both flat portions 4a and 4b of each tube 4, As a result, the tube base 6 is fixed to both the flat portions 4a and 4b of the tube 4 and the side wall 9 of the tank 1 (2) near the outside of the tank 1 (2).

As shown in FIG. 9, the automotive heat exchanger A configured as described above is provided with a fan shroud 12 including a fan 11 on the rear side of the vehicle, and the vehicle mounting pin P is used as a radiator core support (not shown). It is mounted in the engine room of the vehicle in a fixed state.
Further, a bumper armature 13, a bumper fascia 14, a front grill 15, and the like are disposed on the front side of the vehicle heat exchanger A.

  The vehicle running wind in which the circulation medium of about 110 ° C. flowing into the tank 1 from the engine side (not shown) through the input / output port P1 passes through the core portion 3 while flowing through the tubes 4 of the core portion 3. Alternatively, after being cooled to about 60 ° C. by heat exchange with the forced air by the fan 11 and the fins 5, the air flows into the tank 2 and is discharged again from the input / output port P 2 to the engine side, thereby functioning as a radiator. .

  At this time, as shown in FIG. 9, the vehicle heat exchanger A has a vehicle running wind (illustrated by a wavy arrow) in the core portion 3 due to the arrangement of the bumper armature 13, the bumper fascia 14, the opening portion of the front grill 15, and the like. There are parts that are likely to hit and parts that are hard to hit (for example, a part indicated by a range Z in the figure), and there is a possibility that the base 6 of the tube may be cracked or damaged by the thermal stress caused by the temperature difference of the core 3.

  Further, when the cylindrical portion 7 and the side wall 8 of the tank 1 (2) are close to each other as in the first embodiment, the side wall 9 and the cylindrical portion 7 of the tank 1 (2) are not easily bent, so that the thermal stress. Can not be sufficiently relaxed, and it is difficult to reduce the size of the tank 1 (2) and flatten the tube 4.

  However, in the automotive heat exchanger A of the first embodiment, both the flat portions 4a and 4b of the tube 4 near the outside of the tank 1 (2) of the root 6 of the tube 4 and the tank 1 (2) of the tube 4 Since the thermal stress relaxation member 10 fixed to each side wall 9 of the tank 1 (2) is provided, when the tube 4 is thermally expanded / contracted in the longitudinal direction, the thermal stress in the arrow direction C in FIG. The thermal stress can be dispersed and absorbed from the flat portions 4a and 4b of each tube 4 to the thermal stress relaxation member 10, and the thermal stress applied to the base 6 of the tube can be reduced to prevent cracking and breakage.

  Thereby, even when the cylindrical part 7 and the side wall 8 of the tank 1 (2) are close to each other, the size of the tank 1 (2) and the flattening of the tube 4 can be realized.

By the way, since the vehicle traveling wind hits the tube 4 from the front side of the vehicle, when the amount of thermal strain of the tube 4 is measured in minute units, the amount of thermal strain of the curved portion 4c on the front side of the vehicle is applied to the curved portion 4d on the rear side of the vehicle. Bigger than that.
Accordingly, the curved portion 4c on the front side of the vehicle is more likely to be cracked or broken than the curved portion 4d on the rear side of the vehicle, so that the curved portion 4d can be brazed and fixed to the deepest portion 10b of the fitting groove 10a. is there. In this case, the deepest portion 10b is formed in a rectangular shape or the like when it is desired to minimize the contact portion with the curved portions 4c and 4d on the vehicle rear side while realizing the positioning at the time of inserting the thermal stress relaxation member 10.
Further, the position where the thermal stress relieving member 10 fixes both flat portions 4a and 4b of the tube 4 is suitably set to 20 mm or less from the tube base 6 and a desired effect can be obtained when it is separated from the tube base 6. I can't.

Next, the effect will be described.
As described above, in the automotive heat exchanger A of the first embodiment, a pair of flat portions 4a, 4b facing each other in parallel and both ends of the flat portions 4a, 4b are a pair of curves. A plurality of tubes 4 and corrugated fins 5 having a cross section connected by the portions 4c and 4d and formed in a flat cylindrical shape are alternately arranged between the pair of tanks 1 and 2, and In the automotive heat exchanger A in which both ends are inserted and fixed to the corresponding tanks 1 (2), both the tubes 4 are disposed near the outside of the tank 1 (2) of the base 6 of the tube with the tank 1 (2). Since the thermal stress relaxation member 10 fixed to the flat portions 4a and 4b and the wall portion 8 of the tank 1 (2) is provided, the thermal stress applied to the base 6 of the tube can be dispersed in the thermal stress relaxation member 10. The crack and breakage of the tube 4 can be prevented.

  In addition, since the thermal stress relaxation member 10 is a comb-like plate member having a fitting groove 10a that can be fixed by sandwiching both flat portions 4a and 4b of the tube 4, the thermal stress relaxation member 10 is a tube from the vehicle longitudinal direction. The fitting groove 10a and both flat portions 4a and 4b of the tube 4 can be fixed at the same time as being inserted near the base 6 and easily mounted.

  Further, at least the tank 1.2, the tube 4, and the thermal stress relaxation member 10 are made of aluminum, and the thermal stress relaxation member 10 is brazed and fixed to both the flat portions 4a and 4b of the tank and the tube 4, respectively. These three can be fixed without using means.

Although the present embodiment has been described above, the present invention is not limited to the above-described embodiment, and design changes and the like within the scope not departing from the gist of the present invention are included in the present invention.
For example, automotive heat exchangers are not limited to radiators, but generally, both ends of tubes are inserted and fixed in corresponding tanks, such as condensers, integrated heat exchangers in which condensers and radiators are integrally formed, and the like. Applicable to all automotive automotive heat exchangers.

Further, the thickness, shape, number of formations, etc. of the thermal stress relaxation member 10 and the fitting groove 10a can be set as appropriate. For example, in the case where thermal stress at the base of a specific single tube is relaxed, FIG. As shown, a thermal stress relaxation member 20 having one fitting groove 10a may be employed.
As a modification of the shape shown in FIG. 10, the bar of the thermal stress relaxation member 20 may be formed by bending it into a U shape.

  Further, when the distance between the tube root 6 and the portion where the thermal stress relaxation member 10 is fixed to the flat portions 4a and 4b of the tube 4 is separated, as shown in FIG. 11, the tank 1 (2 ) A thermal stress relaxation member 30 refracted outward in an L shape may be employed.

  Further, in the first embodiment, the case where the thermal stress relaxation member 10 is inserted and fixed between the tank 1 (2) and the fin 5 from the rear side of the vehicle has been described. You may insert and fix between the fins 5. In this case, it is desirable to keep the deepest part 10b and the bending part 10c in a non-contact state.

It is a front view which shows the heat exchanger for motor vehicles of Example 1 of this invention. It is a perspective view which shows the heat exchanger for motor vehicles of Example 1 of this invention. FIG. 3 is a perspective cross-sectional view in the vicinity of a range X in FIG. 2. It is sectional drawing of the tube of the present Example 1. FIG. It is a figure explaining the tank inside of the present Example 1. FIG. It is a perspective view of the thermal stress relaxation member of the present Example 1. FIG. 4 is a perspective enlarged cross-sectional view taken along arrow Y in FIG. It is a figure explaining temporary fixation of the thermal stress relaxation member of the present Example 1. FIG. It is a figure explaining mounting to a vehicle of a heat exchanger for cars of this example 1. It is a figure explaining the thermal stress relaxation member of the other Example. It is a figure explaining the thermal stress relaxation member of the other Example.

Explanation of symbols

P Vehicle mounting pins P1, P2 Input / output ports R1, R2 Reinforce 1, 2, Tank 3 Core part 4 Tube 4a, 4b Flat part 4c, 4d Curved part 5 Fin 6 Tube root 7 Tubular part 8, 9 Side wall 10, 20, 30 Thermal stress relaxation member 10a Fitting groove 10b Deepest portion 11 Fan 12 Fan shroud 13 Bumper armature 14 Bumper fascia 15 Front grille

Claims (3)

A pair of flat portions opposed in parallel to each other, a tube formed in a flat cylindrical shape having a cross section in which both ends of the flat portions are connected by a pair of curved portions, and a wavy fin are a pair of tanks Are alternately placed between
In an automotive heat exchanger in which both ends of each tube are inserted and fixed in corresponding tanks,
A heat exchanger for an automobile, comprising thermal stress relaxation members fixed to both the flat portions of the tube and the tank near the outside of the tank at the base of the tank in the tube. The automotive heat exchanger according to claim 1,
An automotive heat exchanger characterized in that the thermal stress relaxation member is a comb-like plate member having a fitting groove that can be fixed by sandwiching both flat portions of the tube. The automotive heat exchanger according to claim 1 or 2,
At least the tank, the tube, and the thermal stress relaxation member are made of aluminum,
An automotive heat exchanger characterized in that the thermal stress relaxation member is brazed and fixed to both flat portions of a tank and a tube.

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