JP4787511B2 - Joining structure of heat exchanger and joining method thereof - Google Patents

Description

  The present invention relates to a heat exchanger joining structure and a joining method thereof, and more particularly to joining of a heat exchanger for welding a plate-like member and a member arranged so as to sandwich the plate-like member from both sides. The present invention relates to a structure and a joining method thereof.

  In general, in manufacturing a heat exchanger, welding may be used when joining a plate-like member and a member arranged so as to sandwich the plate-like member from both sides.

The conventional heat exchanger joining structure and joining method in such a case are arranged so as to sandwich the plate-like member 1 and the plate-like member 1 from both sides, as shown in FIGS. Further, the two members 2 and 3 were separately continuously fillet welded. (For example, refer to Patent Document 1).
JP 2002-137054 A

  However, in the above-described conventional heat exchanger joining structure and joining method, when the plate-like member 1 and the members 2 and 3 arranged so as to sandwich the plate-like member 1 from both sides are welded. However, since it is necessary to perform continuous fillet welding twice, there is a problem that man-hours increase and the welding work takes time. Moreover, since the extra fill of the fillet is required, there is a problem that a filler metal is required.

  The present invention has been made to solve the above-described problems, and aims to provide a heat exchanger joining structure and a joining method thereof that can reduce the number of steps and simplify the welding work. Is.

  The present invention is a joining structure of a heat exchanger for welding to a second member and a third member arranged so as to sandwich a plate-like first member from both sides thereof, and an end portion of the first member Is provided to protrude from the joint portion of the second member and the third member by a predetermined length so as to function as a filler material.

  And preferably, the protrusion length of the edge part of the said 1st member from the junction part of the said 2nd member and the 3rd member is provided so that it may become 0.6 to 1.4 times the thickness of the said 1st member. It is good to have.

  The thickness of the first member may be thinner than the joint between the second member and the third member.

  Moreover, this invention is a joining structure of the heat exchanger for welding to the 2nd member arrange | positioned so that the plate-shaped 1st member may be clamped from the both sides, and a 3rd member, Comprising: The said 1st member is The thickness is 1/3 to 1/2 of the thickness of the joint portion of the second member and the third member so that it can function as a filler material.

  Furthermore, the present invention is a method of joining a heat exchanger for welding to a second member and a third member arranged so as to sandwich a plate-like first member from both sides thereof. A step of disposing an end portion so as to protrude a predetermined length from a joint portion of the second member and the third member, and melting the protruding end portion of the first member and melting the second member and the third member, A step of welding the first member to the second member and the third member at a time.

  Preferably, the first member has a protruding length of 0.6 to 1.4 times the thickness of the first member from the joint portion of the second member and the third member. It is preferable to include a step of arranging one member.

  According to the present invention, the end of the first member functions as a filler material, and the first member can be reliably welded to the second member and the third member by a single welding, thereby reducing man-hours. Thus, various excellent effects such as simplification of the welding operation can be obtained.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. In addition, in the following description, the case where this invention is applied to a multifluid heat exchanger is illustrated and demonstrated.

  First, the joining structure of the heat exchanger according to the embodiment of the present invention will be described with reference to FIGS. Here, FIG. 1 is a sectional view showing the multi-fluid heat exchanger, FIG. 2 is a sectional view showing the joining structure and joining method of the heat exchanger according to the present embodiment, and (a) is before joining. The state is shown, and (b) shows the state after joining.

  A multi-fluid heat exchanger 11 to which the present invention is applied includes a plurality of (three in FIG. 1) cores 12 through which a fluid to be cooled can flow, upper tanks 13 and lower tanks 14 provided at both ends of each core 12, respectively. The case member 15 accommodates a plurality of cores 12 integrally, and cooling water can flow between each core 12 and the case member 15.

  The core 12 includes a plurality (two in FIG. 1) of flat tubes 16 and fins (not shown) provided around the flat tubes 16, and both ends of the flat tubes 16 are connected to the upper tank 13 and the lower tank 14. Communicate. A cooled fluid inlet or outlet 17 is connected to the side surfaces of the upper tank 13 and the lower tank 14.

  A cooling water inlet 18 and a cooling water outlet 19 are connected to the case member 15 at an upper portion and a lower portion of the side wall portion, respectively. The case member 15 is formed with slit holes 20 between the cores 12, and partition plates 21 are inserted into the slit holes 20, and the partition plates 21 are welded to the case member 15. Yes. Furthermore, through holes 22 are formed in the upper end portion or the lower end portion of each partition plate 21 so as to alternate with each other. As shown by arrows in FIG. It circulates while meandering as a whole.

As shown in FIG. 2A, the partition plate 21 protrudes outward by a predetermined length from the joint portion 24 of the case member 15 arranged so as to sandwich the end portion 23 of the partition plate 21 from both sides. When the partition plate 21 is welded to the case member 15, the end 23 of the partition plate 21 functions as a filler material as shown in FIG. 2 (b). Yes. Preferably, the protruding length L of the end portion 23 of the partition plate 21 from the joint portion 24 of the case member 15 is provided so as to be 0.6 to 1.4 times the thickness t ₁ of the partition plate 21. In addition, the thickness t ₁ of the partition plate 21 is preferably thinner than the joint portion 24 (thickness t ₂ and t ₃ ) of the case member 15. More specifically, when the thickness t ₂ and t ₃ of the joint portion 24 of the case member 15 is 1.5 mm and the thickness t ₁ of the partition plate 21 is 0.5 mm, the partition from the joint portion 24 of the case member 15 is separated. The protruding length L of the end portion 23 of the plate 21 is preferably about 0.3 to 0.7 mm.

  Next, a method of joining the partition plate 21 to the case member 15 in the multi-fluid heat exchanger 11 will be described with reference mainly to FIGS. 2 (a) and 2 (b).

  First, as shown in FIG. 2A, the protruding length L of the end portion 23 of the partition plate 21 from the joint portion 24 of the case member 15 is 0.6 to 1.4 times the thickness of the partition plate 21. The partition plate 21 is inserted into the slit hole 20 so that

  Next, the protruding end portion 23 of the partition plate 21 is locally heated and melted, and the joint portion 24 of the case member 15 is melted, and the end portion 23 of the partition plate 21 is joined to the joint portion 24 of the case member 15 at a time. Weld.

  Thus, since the edge part 23 of the partition plate 21 functions as a filler material, a favorable welding surplus can be formed by one welding. Further, by projecting the end portion 23 of the partition plate 21 from the joint portion 24 of the case member 15 by a predetermined length, both the end portion 23 of the partition plate 21 and the joint portion 24 of the case member 15 can be completely melted. it can. Therefore, the partition plate 21 can be reliably welded to the case members 15 on both sides thereof, water leakage from the welded portion can be completely prevented, and the welding operation can be simplified.

  In the above-described embodiment, the case where the partition plate 21 is welded to the case member 15 in the multi-fluid heat exchanger 11 has been described. However, this is merely an example, and the present invention is an exhaust gas recirculation cooler (EGR). In the case of welding the header plate to the casing and the tank body in the cooler), it is widely applied to the case where the plate-like first member is welded to the second member and the third member arranged so as to be sandwiched from both sides. it can. For example, as shown in FIG. 3, when the second member 26 and the third member 27 arranged so as to sandwich the plate-like first member 25 from both sides are bent outward, on the contrary, As shown in FIG. 4, the present invention can also be applied when the second member 26 and the third member 27 are bent inward.

In the above-described embodiment, the end portions of the partition plate 21 and the plate-like first member 25 are provided so as to protrude from the joint portion 24 of the case member 15, the second member 26, and the third member 27 by a predetermined length. However, the thickness t ₁ of the partition plate 21 and the plate-shaped first member 25 is 1/3 to 1 of the thickness t ₂ and t ₃ of the joint portion 24 of the case member 15, the second member 26, and the third member 27. If it is formed so as to be / 2, the end portions of the partition plate 21 and the plate-like first member 25 function as a filler material, so that the case member 15, the second member 26, and the third member are not necessarily required. It does not have to protrude from the joint portion 24 of the member 27. More specifically, when the thickness t ₁ of the partition plate 21 and the plate-like first member 25 is 0.5 mm, the thickness t ₂ of the joint portion 24 of the case member 15, the second member 26, and the third member 27 and t ₃ is preferably about 1.0 to 1.5 mm.

It is sectional drawing which shows the multifluid heat exchanger to which the joining structure of the heat exchanger which concerns on embodiment of this invention, and its joining method are applied. It is sectional drawing which shows the joining structure of the heat exchanger which concerns on embodiment of this invention, and its joining method, (a) shows the state before joining, (b) has shown the state after joining. It is sectional drawing which shows another example of the joining structure of the heat exchanger which concerns on embodiment of this invention, and its joining method. It is sectional drawing which shows another example of the joining structure of the heat exchanger which concerns on embodiment of this invention, and its joining method. It is sectional drawing which shows a prior art example. It is sectional drawing which shows another prior art example.

Explanation of symbols

DESCRIPTION OF SYMBOLS 11 Multifluid heat exchanger 15 Case member 21 Partition plate 23 End part 24 Joint part 25 Plate-shaped 1st member 26 2nd member 27 3rd member

Claims (1)

It is a joining structure of a heat exchanger for welding to a second member and a third member arranged to sandwich a plate-like first member from both sides thereof,
The thickness of a predetermined length protruded provided Rutotomoni the first member is formed thinner than the junction portion of the second member and the third member from the junction of the end portion of the first member and the second member and the third member Thus, the heat exchanger joining structure is configured such that an end portion of the first member functions as a filler material .

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