JPH0518690A - Structure of header for heat exchanger - Google Patents

Abstract

PURPOSE:To obtain the structure of a header for a heat exchanger, which is easy to manufacture and provided with a high pressure resistant property. CONSTITUTION:A header is provided with a constitution wherein a tank material 7 having arc section is opposed and connected to a tube mounting material 9 having a section flatter than the arc section as a whole. The clad layer of brazing material, formed on the surfaces of the tank material 7 and the tube mounting material 9, flows into jointing places whereby both materials are brazed. The tube mounting material 9 is provided with a section having the same radius of curvature constituted of the same inner diameter R2 same as the inner diameter R2 of the tank material 7 at both sides of a part connected to the tank material 7 while the same material 9 is provided with the section 19 of a large radius of curvature constituted of an inner diameter R1 larger than the inner diameter R2 of the tank material at an intermediate part pinched by the sections 17 of the same radius of curvatures. The connecting positions P of the parts 17 of the same radius of curvature and the section 19 having the larger radius of curvature are positioned at the inside of the terminal end of a tube 3. Flat parts 15, having a small height, are formed on the inner peripheral surfaces neighboring to the connecting surfaces 13 of the tank material 7 while the other flat parts 21 having a small height are formed on the inner peripheral surfaces neighboring to the connecting surfaces of the tube mounting material 9.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a header structure of a heat exchanger such as a radiator or a condenser.

[0002]

2. Description of the Related Art As a conventional header structure of a heat exchanger, there is a structure described in Japanese Patent Application Laid-Open No. 63-105400. The header structure has a configuration in which a tank material having a circular cross section and a flat tube mounting material are combined. The tank material and the plate material are joined by brazing.

There is also a header structure described in Nippon Denso Koho Giho 69-154 (published on January 15, 1990). In this header structure, a tank material having an arc-shaped cross section and a tube mounting material having an arc-shaped cross section are combined to form the header in a cylindrical shape. A brazing material is poured into the inner peripheral surface of the joint between the tank material and the tube mounting material to finish it smoothly. By smoothly forming the inner peripheral surface of the joint, stress is prevented from concentrating on the joint.

[0004]

However, both the former and latter header structures have a problem that they are difficult to use as a condenser or a condensation radiator that requires high pressure resistance. For example, in the former header structure, even if the tube mounting material is flat, the pressure resistance is low, and stress concentrates on the joint between the tank material and the tube mounting material that bends at an acute angle. Therefore, the former header structure cannot obtain sufficient pressure resistance for the above application. In addition, since the latter header structure basically has higher pressure resistance than the former because the header is formed in a cylindrical shape, in order to make the inner peripheral surface smooth by pouring the brazing material on the inner peripheral surface of the joint. Manufacturing is difficult, and brazing material may not be sufficiently supplied, which may cause brazing failure. If brazing fails, the strength will decrease. Further, the cylindrical header leads to an increase in the size of the header.

An object of the present invention is to solve the above problems and to provide a header structure of a heat exchanger which is easy to manufacture and has high pressure resistance.

[0006]

The header structure of the heat exchanger according to the present invention is a header structure in which a refrigerant flows in and out of a tube, wherein the header is a tank having a longitudinal cross section of an arc shape. And a longitudinal tube mounting material whose cross section is generally flatter than the arcuate shape are joined to each other in the longitudinal direction, and the tank material is at least a joint surface with the tube mounting material. A thin layer of the brazing material provided, and a flat portion of a minute height formed on the inner peripheral surface adjacent to the joint surface with the tube mounting material, the tube mounting material,
At least a thin layer of a brazing material provided on the joining surface with the tank material, a flat portion of a minute height formed on an inner peripheral surface adjacent to the joining surface with the tank material, and a joining surface with the tank material A large curvature having a curvature that is substantially the same as the curvature of the tank material formed in the vicinity, and a curvature that is larger than the curvature of the tank material formed in the central portion sandwiched on both sides by the same curvature portion. And a connection position between the same curvature portion and the large curvature portion is set inside a tube attachment area to be attached to the tube attachment material.

In the above structure, since the thin layer of the brazing material is provided on the joining surface of the tank material and the joining surface of the tube mounting material, the brazing material is sufficiently supplied to the joining surface when joining the two materials. Good attachment. Further, the inner peripheral surface of the connection portion between the tank material and the tube mounting material is smoothly connected by the flat portion having the minute height. In other words, variations in the shape of the tank material and tube mounting material that occur during processing change the shape of the inner peripheral surface of the connection point, but since the inner peripheral surface adjacent to the joint surface is a flat portion with a minute height, Variation does not lead to loss of smoothness on the inner peripheral surface. Therefore, large stress concentration does not occur at the connection point.

Further, since the tube attachment member is composed of the same curvature portion on both sides and the large curvature portion sandwiched between the same curvature portion, it has a flatter shape than the tank material as a whole.
Since the connection position between the same curvature portion and the large curvature portion is set inside the tube mounting region, the disadvantage of the strength of the large curvature portion due to the shape is eliminated by the tube itself functioning as a structural material. Therefore, the header in which the tank material and the tube mounting material are joined realizes high pressure resistance and is compact.

As described above, the header structure having the above structure is easy to manufacture and has a high pressure resistance.

[0010]

EXAMPLES The header structure of the heat exchanger of the present invention will be described below with reference to MF.
An embodiment applied to the header of the (multilayer type) capacitor will be described. FIG. 1 shows an overall view of the capacitor. Headers 1 are provided on both sides of a core composed of tubes 3 and fins 5.

The header 1 has the following structure. As shown in the cross-sectional view of FIG. 2, the header 1 includes a long tank material 7 having a circular arc-shaped cross section and a tube mounting material 9 having a flat cross-section that is flatter than the arc-shaped material. And has a configuration in which they are joined in the longitudinal direction.

The tank material 7 has a semi-cylindrical shape having an inner peripheral surface having a radius R2 which is approximately half the width of the tube 3, and is provided with clamp portions 11 on the left and right. A joint surface 13 having a sharp bend is formed inside the clamp portion 11. A flat portion 15 having a small height is formed on the inner peripheral surface adjacent to the joint surface 13. The height of the flat portion 15 is preferably 1 mm or more in terms of production, but is designed to be a minute height within a range that does not impair the cylindrical shape. The tank material 7 is made of an aluminum clad material, and a clad layer of a brazing material is formed on both inner and outer surfaces. The tank material 7 is manufactured by press molding or roll molding (strong pressure roll molding).

The tube attachment material 9 has the same curvature portion 17 having the same inner diameter R2 as the inner diameter R2 of the tank material 7 on both sides joined to the tank material 7, and an intermediate portion sandwiched by the same curvature portions 17 An inner diameter R1 larger than the inner diameter R2 of the tank material 7
It has a large curvature portion 19 composed of. Therefore, the large-diameter curvature portion 19 slightly projects to the fin 5 side. The connection position P between the same curvature portion 17 on both sides and the large curvature portion 19 in the middle is
It is located inside both ends of the tube 3. A flat portion 21 having a minute height is formed on the inner peripheral surface adjacent to the joint surface facing the joint surface 13 of the tank material 7. The height of the flat surface portion 21 is preferably 1 mm or more in terms of production as in the case of the flat surface portion 15, but is designed to be a minute height within a range in which the inner diameter R2 of the same curvature portion 17 is not impaired as a whole. Further, a tapered hole 23 into which the tube 3 is inserted is formed in the middle portion of the tube attachment material 9 by press molding. The material of the tube mounting material 9 is an aluminum clad material, and a brazing material clad layer is formed on both inner and outer surfaces. The plate thickness is the same as or thicker than the plate thickness of the tank material 7.
This is to supplement the strength of the tube attachment material 9, which is weaker in shape than the semi-cylindrical tank material 7. The tube attachment material 9 is manufactured by press molding or roll molding.

The header 1 described above is assembled as follows. First, both sides of the tube attachment material 9 are caulked by the clamp portions 11 on both sides of the tank material 7, and the tank material 7 and the clamp portion 11 are temporarily fixed. In addition, the hole 23 of the tube mounting member 9
Insert tube 5 into Next, integrated brazing is performed in the furnace. Then, the brazing material clad layer is melted and the tank material 7 and the tube mounting material 9 and the tube mounting material 9 and the tube 5 are bonded. The brazing material in the clad layer melts and flows into the joint, so the brazing material is sufficiently supplied to the joint surface,
Good brazing.

In the assembled header 1, the inner peripheral surface of the connecting portion between the tank material 7 and the tube mounting material 9 is smoothly connected by the flat portions 15 and 21 having a minute height. That is, variations in the shapes of the tank material 7 and the tube mounting material 9 that occur during processing change the shape of the inner peripheral surface of the connection portion, but the inner peripheral surface adjacent to the joint surface has a flat portion 15 having a small height. Since it is 21, the variation in shape does not lead to loss of smoothness of the inner peripheral surface. As a result, a large stress concentration does not act on the connection point.

Further, since the tube mounting member 9 is composed of the same curvature portion 17 on both sides and the large curvature portion 19 sandwiched between the same curvature portion 17, it has a flatter shape than the tank material 7 as a whole. Since the connection position of the same curvature part 17 and the large curvature part 19 is set inside the attachment area of the tube 5, the disadvantage of the strength which the large curvature part 19 shows in shape is eliminated by the tube itself functioning as a structural material. It Therefore,
The header 1 in which the tank material 7 and the tube mounting material 9 are joined together achieves high pressure resistance and is compact.

According to the header structure described above, there is an effect that the manufacturing can be simply and surely performed only by integrally brazing in the furnace. Further, there is an effect that high pressure resistance can be obtained by utilizing the characteristic of the cylindrical shape without inviting stress concentration at the joint portion.

Further, since the header 1 secures a sufficient refrigerant flow path, it is possible to suppress the refrigerant pressure loss, increase the core heat transfer area, and improve the performance. In addition, the header 1 has the advantage of reducing the dead space because it has a small height and is compact while improving the performance in this way.

Although the embodiments have been described above, the present invention is not limited to the embodiments, and it goes without saying that the invention can be implemented in various modes without departing from the spirit of the invention. For example, the present invention may be applied to a condensation radiator that requires high pressure resistance. The thin layer of brazing material formed on the tank material or the tube mounting material may be formed by thermal spraying.

[0020]

According to the header structure of the heat exchanger described in detail above, manufacturing is facilitated, high pressure resistance is realized by utilizing the characteristics of the cylindrical shape, and the header can be made compact. Produce an effect.

[Brief description of drawings]

FIG. 1 is an overall view of a capacitor as an embodiment of the present invention.

FIG. 2 is a cross-sectional view of a header.

FIG. 3 is a vertical sectional view of a header.

[Explanation of reference numerals] 1 ... Header, 3 ... Tube, 5 ... Fin, 7 ... Tank member, 9 ... Plate member, 11 ... Clamping portion, 13 ... Joining surface, 1
5 ... Planar part, 17 ... Same curvature part, 19 ... Large curvature part, 21 ... Flat part, 23 ... Tube insertion hole, P ... Connection position of the same curvature part 17 and large curvature part 19

Claims (1)

Claim: What is claimed is: 1. A structure of a header for flowing a refrigerant into and out of a tube, wherein the header is a tank material having a longitudinal cross section of an arc shape, and the cross section is entirely the circular shape. It has a configuration in which a long tube mounting material that is flatter than an arc shape is opposed to and joined in the longitudinal direction, the tank material is at least a thin layer of a brazing material provided on a joint surface with the tube mounting material, and the tube. A flat portion of a minute height formed on the inner peripheral surface adjacent to the joint surface with the mounting material, the tube mounting material, at least a thin layer of brazing material provided on the joint surface with the tank material, A flat portion having a minute height formed on the inner peripheral surface adjacent to the joining surface with the tank material, and the same curvature portion having a curvature substantially the same as the curvature of the tank material formed near the joining surface with the tank material. And the both sides are sandwiched by the same curvature part A large curvature portion having a curvature larger than the curvature of the tank material formed in a portion, and further, the connecting position of the same curvature portion and the large curvature portion is attached to the tube attachment material of a tube attachment region. The header structure of the heat exchanger, which is set inside.