JPH0579789A - Joining structure for core support of heat exchanger - Google Patents

Abstract

PURPOSE:To effectively and rapidly position core supports to be disposed on both sides of a heat exchanger core and a tube plate in a joining structure of the supports to the plate. CONSTITUTION:A long hole to align the section of a second pawl 9 is opened at the end of a core support 8, and the pawl 9 is inserted into the hole in a state that the pawl 9 is once bent to the outside of an outer wall. Then, the pawl 9 is folded to be brought into contact with the outer surface of the support 8. The support 8 including the pawl 9 is integrally brazed or soldered fixedly to the outer surface of a tube plate 4.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a joint structure of a tube plate joined to an open end of a resin tank and a core support joined to an end of the tube plate,
The present invention relates to the one that improves the brazing accuracy of both and improves the workability of brazing.

[0002]

2. Description of the Related Art At the time of joining a core support and a tube plate, in order to ensure good positioning of the joining portion,
The applicant has already proposed a caulking structure as shown in FIG. That is, the second claw portion 9 projecting at the longitudinal end portion of the tube plate 4 is bent outward, and the edge portion of the core support 8 is sandwiched between the tube plate 4 and the end portions of the core support 8 and the fins 6. The contact portions of the core support 8 are integrally brazed and fixed. When brazing, the brazing material is clad on the surface of at least one of the parts that come into contact, and the whole is assembled and inserted into a high-temperature furnace to melt the brazing material and to solidify it by cooling it. It is fixed by brazing. In addition,
Sometimes soldering is used instead of brazing.

[0003]

However, the conventional caulking structure as shown in FIG. 4 has a drawback that it is difficult to position the tube 5 in the longitudinal direction. That is, when the second claw portion 9 is folded back and bent, it is difficult to accurately position the tube plate 4 and the core support 8 in the vertical direction.

[0004]

SUMMARY OF THE INVENTION Therefore, the present invention has an object to provide a joining structure capable of accurately and quickly positioning the tube plate 4 and the core support 8 in the vertical direction. The following configuration is adopted. The core support joining structure of the present invention has a pair of tube plates 4 in which a large number of tube insertion holes 3 are formed. The tube plate 4 has an elongated rectangular plane and an annular groove 1 is formed on the periphery thereof. The first claw portion 2 for caulking the resin tank is projectingly provided on the outer wall end of the annular groove. Then, both ends of the tube 5 are liquid-tightly inserted and fixed in the tube insertion hole 3. Further, the fins 6 are arranged in contact with each other between the tubes 5 and 5, and they form the core 7. The core supports 8 are fixed on both sides of the core 7.

Here, the feature of the joining structure of the present invention is that the second claw portion 9 for caulking the core support is projectingly provided at the outer wall end at the end in the longitudinal direction of the tube plate 4. Further, both ends of the core support 8 are bent into an L shape aligned with the outer periphery of the cross section of the annular groove 1, and the L
A long hole 10 is bored in the width direction of the V-shaped tip edge portion, and the long hole 10 is aligned with the cross section of the second claw portion 9. Then, in a state where the second claw portion 9 is once bent outward with respect to the outer wall,
The second claw portion 9 is inserted into the elongated hole 10, and then the second claw portion 9 is folded back to contact the outer surface of the core support 8. In this state, the second claw portion 9 is included, and the core support 8 and the outer surface of the tube plate 4 are integrally brazed or soldered and fixed.

[0006]

According to the core support joining structure of the present invention, first, the elongated hole 10 of the core support 8 is inserted into the second claw portion 9 of the tube plate 4 as shown in FIG. 1, the core support 8 is fixed to the tube plate 4, and the brazing material on the surface of each component is melted and integrally brazed and fixed in such a state. By doing so, the tube plate 4 and the core support 8 are reliably positioned in the vertical direction, and the heat exchanger has a high accuracy.

[0007]

Embodiments of the present invention will now be described with reference to the drawings. FIG. 1 is a perspective explanatory view of a core support joint structure of the present invention, FIG. 2 is an explanatory view showing a preparation stage thereof, and FIG. 3 is a longitudinal sectional view of the joint structure. In this heat exchanger, a pair of tube plates 4 are vertically separated from each other (all lower parts and right parts are omitted, the same applies hereinafter), and both ends of a flat tube 5 are inserted into the tube insertion holes 3 thereof. A corrugated fin 6 is interposed between the tubes 5 to form a core 7. Then, core supports 8 formed by bending a metal plate in a U-shaped cross section are arranged on both sides of the core.
As shown in FIG. 2, the upper end of the core support 8 is formed to have an L-shaped vertical cross section, which aligns with the outer surface of the annular groove 1 of the tube plate 4 as shown in FIG. And core support 8
Long holes 10 are formed at both upper and lower end portions of, respectively. The size of the elongated hole 10 is matched with the cross section of the second claw portion 9 projecting in an L shape at the outer wall end of the annular groove 1. At the same time, the positions of both match. In addition, the tube plate 4 is shown in FIGS.
As shown in FIG. 5, a large number of first claw portions 2 are provided so as to be separated from each other.

Then, the upper and lower elongated holes 10 of the core support 8 are provided.
The second claw portions 9 of the pair of tube plates 4 are inserted into the core plate 8 and the second claw portions 9 are folded back as shown in FIG.
Press on the outer surface. Thereby, the space between the pair of upper and lower tube plates is accurately maintained. The outer surfaces of the core support 8, the tube plate 4, and the fins 6 are previously coated with a brazing material. Therefore, the whole assembly is inserted into a vacuum furnace in the assembled state as shown in FIG. 1, the brazing material is melted and then it is cooled and solidified, and the respective joint portions are integrally brazed and fixed. Next, as shown in FIG. 3, the resin tank is inserted into the annular groove 1 of the tube plate 4 through the packing 12.
The hem portion 13 of 11 is fitted and the first claw portion 2 is bent to join the resin tank 11 and the tube plate 4 in a liquid-tight manner to complete the heat exchanger.

[0009]

According to the core support joining structure of the present invention, the second claw 9 is inserted into the elongated hole 10 with the second claw 9 being once bent outward with respect to the outer wall, and then the second claw 9 is inserted. The two claws 9 are folded back and brought into contact with the outer surface of the core support 8, and in that state, the core support 8 and the outer surface of the tube plate 4 including the second claws 9 are integrally brazed or soldered and fixed. Therefore, the positioning at the time of brazing can be performed accurately and reliably. That is, the second claw portion 9
The core support 8 and the tube plate 4 are securely restrained in any direction three-dimensionally by inserting and folding back the long holes 10 and brazing or soldering the two in that state. Therefore, it becomes possible to maintain high accuracy such as brazing. Moreover, it is not necessary to position and fix the core support 8 and the tube plate 4 with another jig or the like at the time of brazing or the like, and the joining structure has a good workability.

[Brief description of drawings]

FIG. 1 is an explanatory view of a main part of a core support joining structure of the present invention.

FIG. 2 is an assembly explanatory view of the joint structure.

FIG. 3 is a vertical sectional view of the structure.

FIG. 4 is a perspective view of a main part of a conventional core support joint structure.

[Explanation of symbols]

 1 Annular groove 2 First claw part 3 Tube insertion hole 4 Tube plate 5 Tube 6 Fin 7 Core 8 Core support 9 Second claw part 10 Long hole 11 Resin tank 12 Packing 13 Bottom part

Claims (1)

[Claims] 1. A flat and slender rectangular plane is formed with an annular groove (1) at its peripheral edge, and a first claw portion (2) for caulking a resin tank is provided at the outer wall end of the annular groove so as to project therefrom.
A pair of tube plates (4) in which a large number of tube insertion holes (3) are formed, a large number of tubes (5) whose both ends are liquid-tightly inserted and fixed in the tube insertion holes (3), and each tube ( 5) A core (7) is formed by a large number of fins (6) arranged in contact with each other, and the core (7) is formed.
In a core support joint structure of a heat exchanger in which core supports (8) are fixed on both sides of the core support, the second claw portion (9) for caulking the core support is provided at the outer wall end at the longitudinal end of the tube plate (4). Projectingly provided, both ends of the core support (8) are bent into an L shape aligned with the outer circumference of the cross section of the annular groove (1), and the L-shaped tip edge portion has the first portion in the width direction. A long hole (10) which is aligned with the cross section of the second claw portion (9) is formed, and the second claw portion (9) is once bent outward with respect to the outer wall. 9) is inserted into the elongated hole (10), and then the second claw portion (9) is folded back and brought into contact with the outer surface of the core support (8), and in that state, the second claw portion (9). ), The core support (8) and the outer surface of the tube plate (4) are integrally brazed or A core support joint structure for heat exchangers characterized by being fixed by soldering.