JP2005308365A - Heat exchanger - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a heat exchanger having reduced manufacturing cost, wherein the movement of a tube due to its thermal expansion or shrinkage is reliably absorbed. <P>SOLUTION: The heat exchanger comprises a core consisting of the tube 11 and a fin and a tank 12 provided at the end of the core. The tank 12 has a header plate 14 joined with the end of the tube 11, a tank body 15 joined to the header plate 14 into a slender cylindrical shape, and a cover member 17 for closing openings 16 at both ends of the tank body 15. A cutout portion 26 is formed in a joint portion of the tank body 15 to the header plate 14. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a heat exchanger used in an automobile or the like, and more particularly to a heat exchanger that can absorb the movement of a tube during heat exchange.

  2. Description of the Related Art Conventionally, as shown in FIG. 3, a heat exchanger such as an automobile radiator has a core composed of a plurality of tubes 1 and fins (not shown), and a tank 2 provided at an end of the core. The tank 2 is further composed of an elongated groove-like header plate 3 bent on both sides of the anti-core side, an elongated bowl-shaped tank body 5 having openings 4 at both ends, and a tank body 5. And a lid member (not shown) capable of closing the opening 4.

  When manufacturing such a heat exchanger, first, the end of the tube 1 is inserted into the header plate 3, and the fins are disposed between the tubes 1. In addition, the tank body 5 is fitted to the header plate 3 and the lid member is attached so as to close the opening 4 of the tank body 5 to assemble the heat exchanger. Thereafter, the assembled heat exchanger is placed in a high-temperature furnace, and the brazing material of each joint between the header plate 3 and the tube 1 and the tank main body 5, and each joint between the lid member and the tank main body 5 and the header plate 3. Are melted and integrally brazed and fixed (see, for example, Patent Documents 1 and 2).

  However, in the conventional heat exchanger described above, the header plate 3 cannot follow the movement of the tube 1 due to thermal expansion or contraction during heat exchange, and a crack or the like occurs at the joint between the end of the tube 1 and the header plate. This causes a problem of fluid leakage, and the problem is particularly serious at both ends of the tank 2 where the joints of the members are concentrated.

  Therefore, in order to absorb such movement of the tube 1, a heat exchanger in which an extension absorbing portion including a bent portion is formed around the header plate 3 has been proposed (for example, see Patent Document 3).

JP-A-5-322475 Japanese Patent Laid-Open No. 9-269199 JP-A-1-81488

  However, in the heat exchanger in the latter conventional example described above, the structure of the elongation absorbing portion is very complicated, so that the processing work becomes complicated and the manufacturing cost increases.

  The present invention has been made to solve the above-described problems, and is intended to provide a heat exchanger that can reliably absorb movement due to thermal expansion and contraction of a tube and can reduce manufacturing costs. .

  The present invention is a heat exchanger comprising a core composed of tubes and fins, and a tank provided at an end of the core, the tank including a header plate to which the end of the tube is joined, A tank body formed into an elongated cylindrical shape by joining to the header plate, and a lid member capable of closing the openings at both ends of the tank body, the joint portion of the tank body with the header plate Is characterized in that a notch is formed.

  And preferably, the said notch part is provided in the both-ends vicinity of the said tank main body.

  According to the present invention, since the notch is formed in the joint portion of the tank body with the header plate, the header plate can follow the movement of the tube due to thermal expansion and contraction, and the movement of the tube Can be reliably absorbed. Therefore, there is no possibility that the joint between the end of the tube and the header plate will be cracked during heat exchange, or the tube may fall off the header plate, and the reliability of the product can be improved.

  In addition, the structure that absorbs the movement of the tube is configured only by forming a notch in the tank body, and since the structure is simple, the processing work of the tank body can be simplified and the manufacturing cost can be reduced. Various excellent effects can be obtained.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

  First, the heat exchanger which concerns on embodiment of this invention is demonstrated, referring FIG.1 and FIG.2. Here, FIG. 1 is a perspective view showing the heat exchanger according to the embodiment, and FIG. 2 is a sectional view of the heat exchanger. In the following description, a case where the present invention is applied to an aluminum heat exchanger used in automobiles, construction machines, and the like will be described.

  This aluminum heat exchanger includes a core composed of a required number of tubes 11 and fins (not shown), and a tank 12 provided at an end of the core. A header plate 14 to which the end portion 13 is joined, a tank body 15 that is formed into an elongated cylindrical shape by joining the header plate 14, and a lid member 17 that can close the openings 16 at both ends of the tank body 15. Consists of the subject.

  The header plate 14 includes an elongated flat plate-like tube joint portion 18 and tank body joint portions 19 and 20 that are bent to the opposite core side along the longitudinal direction of both sides of the tube joint portion 18. Tube joining holes 21 are formed in the tube joining portion 18 corresponding to the number of the tubes 11, and the end portion 13 of the tube 11 can be inserted into the tube joining hole 21. The tube 11 is joined to the header plate 14 by brazing the end 13 of the tube 11 to the tube joint 18 of the header plate 14 so that the inside of the tube 11 communicates with the inside of the tank 12. ing.

  The tank body 15 has an elongated bowl shape with an opening on the header plate 14 side, and side edges 24 and 25 of both side wall portions 22 and 23 are inside the tank body joint portions 19 and 20 of the header plate 14, respectively. The tank body 15 is joined to the header plate 14 by being fitted and brazed. Further, the side edge portions 24 and 25 of the side wall portions 22 and 23 of the tank main body 15 are formed with notches 26 in the vicinity of both ends. Further, slit grooves 27 are formed at both ends of the tank body 15 in parallel with the opening 16, and the lid member 17 can be inserted into the slit grooves 27.

  The lid member 17 is composed of a flat plate-like closed portion 28 that matches the shape of the opening 16 at both ends of the tank body 15, and arm portions 29, 30 formed on both sides of the closed portion 28. Insertion grooves 31 and 32 are formed between the arm portions 29 and 30 and the closing portion 28, respectively.

  In order to manufacture such an aluminum heat exchanger, first, the end portion 13 of each tube 11 is inserted into the tube joint hole 21 of the header plate 14, and the fins are disposed between the tubes 11. In addition, the side edge portions 24 and 25 of the side wall portions 22 and 23 of the tank body 15 are fitted inside the tank body joint portions 19 and 20 of the header plate 14, respectively. Further, the lid member 17 is inserted into the slit groove 27 of the tank body 15, and the side walls 22 and 23 of the tank body 15 are fitted into the fitting grooves 31 and 32, respectively, and the opening 16 is closed. Thereafter, the heat exchanger assembled in this manner is placed in a high-temperature furnace, the tube joint 18 of the header plate 14 and the end 13 of the tube 11, the tank body joints 19 and 20 of the header plate 14, and the tank body 15. The brazing material is melted at the side edge portions 24 and 25 of the side wall portions 22 and 23, the header plate 14 and the joint portion between the tank main body 15 and the lid member 17 and brazed and fixed integrally.

  Next, the operation of the aluminum heat exchanger according to the present embodiment will be described.

  If fluid flows through the tube 11 during heat exchange in the aluminum heat exchanger, the tube 11 expands and contracts due to thermal expansion or contraction as the temperature of the circulating fluid changes. As a result, a load is applied to the joint portion between the end portion 13 of the tube 11 and the tube joint portion 18 of the header plate 14 at both ends of the tank 12 where the joint portions of the respective members are concentrated. Since the notches 26 are formed in the vicinity of both end portions of the side edges 24 and 25 of the wall portions 22 and 23, the header plate 14 follows the movement of the tube 11 due to thermal expansion and contraction, The movement of the tube 11 can be reliably absorbed, and the load applied to each joint portion described above can be reduced. Therefore, there is no possibility that the joint portion between the end portion 13 of the tube 11 and the tube joint portion 18 of the header plate 14 will be cracked during the heat exchange, or the tube may fall off from the header plate. Can be improved. In addition, the structure that absorbs the movement of the tube 11 is configured only by forming the notch portion 26 in the tank body 15, and the structure is simple. Therefore, the processing operation of the tank body 15 is simplified, and the manufacturing cost is reduced. Can be achieved.

  In the above-described embodiment, the notches 26 are provided only in the vicinity of both ends of the tank body 15, but this is merely an example, and the side edges 24 of the side walls 22 and 23 of the tank body 15. , 25 may be provided in other parts, such as provided at predetermined intervals over the whole.

  Moreover, the tube joining hole 21 formed in the tube joining part 18 may be formed by burring.

  Furthermore, although the case where the present invention is applied to an aluminum heat exchanger has been described in the above-described embodiment, this is merely an example, and the present invention is also applied to a heat exchanger made of a material other than aluminum. It goes without saying that it is possible.

It is a perspective view which shows the heat exchanger which concerns on embodiment of this invention. It is sectional drawing which shows the heat exchanger which concerns on embodiment of this invention. It is sectional drawing which shows a prior art example.

Explanation of symbols

11 Tube 12 Tank 13 End 14 Header Plate 15 Tank Body 16 Opening 17 Lid Member 26 Notch

Claims (2)

A heat exchanger comprising a core made of tubes and fins, and a tank provided at an end of the core,
The tank includes a header plate to which an end portion of the tube is joined, a tank body formed into an elongated cylindrical shape by joining the header plate, and a lid member capable of closing openings at both ends of the tank body. And
The heat exchanger according to claim 1, wherein a cutout portion is formed in a joint portion between the tank body and the header plate. The heat exchanger according to claim 1, wherein the notch is provided near both ends of the tank body.

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