WO2000026600A1

WO2000026600A1 - Header pipe for heat exchanger

Info

Publication number: WO2000026600A1
Application number: PCT/JP1998/004974
Authority: WO
Inventors: Soichi Kato
Original assignee: Zexel Corporation
Priority date: 1998-11-04
Filing date: 1998-11-04
Publication date: 2000-05-11

Abstract

A header pipe for a heat exchanger in which ends of a plurality of stacked tubes (2) are inserted into tube insertion holes (5) of a pair of header pipes (4), with fins (3) interposed between the tubes (2). The header pipe (4) is made by rolling a plate into a cylinder and is formed with a plurality of tube insertion holes (5) in which to insert tubes and with a coolant inlet/outlet port (14, 15) through which a heat exchange medium flows in or out. The coolant inlet/outlet port constitutes a heat exchanger header pipe formed at a location between the tube insertion holes (5, 5). With this arrangement, the positions of the holes such as tube insertion holes or coolant inlet/outlet port are changed, thereby preventing deformations of these holes, improving assembly performance and solderability.

Description

Akira Itoda Sho Header pipe for heat exchangers Technical field

The present invention relates to a header pipe of a heat exchanger used for an automobile refrigeration cycle. Background technology

In a refrigeration cycle for automobiles, for example, a laminated heat exchanger is known as a heat exchange medium aggregating device. In this type of heat exchanger, a plurality of tubes and fins are alternately stacked, and both ends of the stacked tubes are inserted and joined into insertion holes formed in a header pipe. A partition plate that partitions the length of the header pipe is provided at required positions of these header pipes, and the heat exchange medium flowing from the refrigerant inlet / outlet formed in the header pipe meanders between the header pipes multiple times. It is equipped with a configuration for passing through.

As such a header pipe used in a heat exchanger, for example, a flat brazing sheet coated with a cladding material is used as a material, and this material is rounded by press molding or the like. It is known that the shape is formed in a tubular shape.

This type of header pipe is continuously rolled from a flat plate shape to a circular tube shape by press-forming with a die having various types while sequentially transferring a rectangular flat plate material of a predetermined size. It is manufactured by joining the ends of the material by brazing.

In addition, a mold such as a punch is used for the plate-shaped material to form a refrigerant inlet / outlet through which the heat exchange medium flows into the inside of the header pipe, and to stack in parallel. A tube insertion hole or the like for the tube to be layered is formed.

That is, after the both ends of the flat material are slightly bent, the material is sequentially bent so as to gradually become round. After being bent to a predetermined curvature, press forming is performed with upper and lower dies, so that various holes are used to open necessary holes such as a tube insertion hole and a refrigerant inlet / outlet hole. Finally, the joint end and its vicinity are rounded so as to be round, and formed into a circular tube.

FIG. 5 shows a part of a schematic configuration of the header pipe 4 formed by rolling the flat material into a circular tube in this manner.

However, as shown in Fig. 5, when the refrigerant outlet hole 14 is formed adjacent to the tube inlet hole 5, the tube is inserted due to the extensibility of the material during the bending process of the flat material. The size of the hole-to-coolant inlet / outlet may be deformed, and in some cases, the header pipe may be deformed without being rounded.

Fig. 6 (A) is a cross-sectional view of the header pipe in a state where deformation does not occur (the state where it should be), and Fig. 6 (B) is a view taken along the line Y-Y in Fig. 5. FIG. 4 is a cross-sectional view showing a state in which the space between the tube insertion hole 5 and the refrigerant inlet / outlet 14 is deformed due to the extensibility of the material, and as a result, the tube insertion hole 5 is deformed. In addition, 5 a in the figure indicates the bulging of the tube insertion hole 5.

That is, if the tube insertion hole 5 and the refrigerant outlet hole 14 are formed close to each other, the interval t 1 between the tube insertion hole 5 and the refrigerant outlet hole 14 is narrow, and the strength of the material is not ensured. 6 As shown in (B), when the tube insert hole 5 and the refrigerant inlet / outlet 14 are pulled due to the extensibility of the material, the tube insert hole 5 is enlarged and formed. There is. If the tube insertion hole 5 expands and deforms, a medium leak occurs due to a poor tube assembly or a poor brazing, causing a problem that the yield rate decreases.

Accordingly, the present invention provides a method for inserting a tube formed in a header pipe. An object of the present invention is to provide a header pipe which prevents deformation of a hole or a refrigerant inlet / outlet hole and improves assembling and brazing. Disclosure of the invention

The invention according to claim 1 of the present application is characterized in that a fin is interposed between a plurality of stacked tubes, and the ends of the tubes are inserted into the tube insertion holes of the pair of header pipes, so that a heat exchanger is provided. In the header pipe of the heat exchanger forming

The header pipe is formed by rolling a plate into a tubular shape,

The header pipe has a plurality of tube insertion holes into which tubes are inserted, and a refrigerant outlet hole through which a heat exchange medium flows in and out, and the refrigerant outlet hole is located at a position located between the tube insertion holes. It is a header pipe of the heat exchanger formed.

In this way, if the refrigerant inlet / outlet hole formed in the header pipe is formed at a portion located between the plurality of tube insertion holes, the interval between the tube insertion hole and the refrigerant outlet / outlet becomes wider, and the material becomes larger. Since the strength is secured, deformation such as enlargement of the hole is prevented by the extensibility of the material.

In the invention described in claim 2 of the present application, in the invention according to claim 1, the imaginary line connecting the center of the hole and the center of the header pipe with respect to the imaginary axis in the longitudinal direction of the tube is provided. And a header pipe of the heat exchanger having a predetermined angle.

In this case, the predetermined angle is determined depending on the material of the header pipe, and is appropriately selected depending on the strength, spreadability, thickness, and the like of the material.

The invention described in claim 3 of the present application is the invention according to claim 2, wherein the angle is approximately 115 ° to 144 °, preferably approximately 130 ° from the front direction to the rear direction. The configuration of the heat exchanger header It is a pipe.

When this angle is approximately 115 ° to 144 °, preferably approximately 130 °, the refrigerant inlet / outlet hole should have a certain distance from the tube insertion hole. Therefore, the distance between the tube insertion hole and the refrigerant inlet / outlet hole is wider than in the conventional case, so that the material strength is secured and the tube insertion hole / the refrigerant outlet / inlet hole due to the extensibility of the material during the bending process. It is possible to prevent deformation and, in turn, deformation of the header pipe.

The invention described in claim 4 of the present application is the heat exchanger according to claim 1, wherein the refrigerant inlet / outlet hole is formed between the end of the tube insertion hole and the joining end of the header pipe. This is the header pipe of the container.

Also in this case, the refrigerant inlet / outlet can have a certain space with respect to the tube insertion hole, so that the material strength is secured and the tube insertion due to the extensibility of the material during the bending process. Holes 変形 It is possible to prevent deformation of the refrigerant inlet / outlet holes, and hence deformation of the header pipe. BRIEF DESCRIPTION OF THE FIGURES

【Figure 1 】

It is a front view showing the heat exchanger which carried out the present invention.

【Figure 2 】

FIG. 4 is a schematic end view showing a state where a material is sequentially rounded to form a header pipe.

[Figure 3]

FIG. 4 is a schematic configuration diagram showing a part of a header pipe according to a specific example of the present invention.

[Fig. 4]

FIG. 4 is a sectional view taken along the line X—X in FIG. 3. [Figure 5]

FIG. 6 is a schematic configuration diagram showing a part of a header pipe according to a conventional example.

5A is a cross-sectional view of a header pipe, and FIG. 5B is a cross-sectional view of FIG. BEST MODE FOR CARRYING OUT THE INVENTION

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

FIG. 1 is a front view of a heat exchanger 1 according to a specific example of the present invention. As shown in FIG. 1, the heat exchanger 1 has a plurality of flat tubes 2 and wavy fins 3 alternately stacked, and each end of the stacked flat tubes 2 is connected to the left and right header pipes 4, 4. It is inserted into the tube insertion hole 5 of 4 and connected for communication. Side plates 6 each having a U-shaped cross section are inserted into and joined to insertion holes 7 formed in the header pipe at the upper and lower ends of the laminated tubes.

Further, inside the header pipe 4, a partition plate 8 for partitioning the inside of the header pipe 4 in the longitudinal direction is provided. The upper and lower openings of the header pipe 4 are closed by caps 10. Further, the header pipe 4 is formed with refrigerant inlet / outlet holes 14 and 15 through which the heat exchange medium flows, and the inlet joint 12 or the outlet joint 13 is inserted and joined, respectively. The heat exchange medium flows between the inlet and outlet joints 12 and 13 meandering between the tubes of the heat exchanger.

The tube 2 is formed by bending a single plate or by superimposing two plates, and is inserted into an insertion hole 5 provided in the header pipe 4 to be integrated. More joined. The insertion hole 5 is formed in a shape that matches the cross-sectional shape of the tube 2. The header pipe 4 is made of a brazing sheet having a surface coated with a cladding material as a material 4A, and as shown in FIG. It is formed in a circular tube with 4B joined.

The header pipe 4 is formed in a tubular shape as follows. The header pipe 4 is manufactured by press molding using various dies including upper and lower dies. These dies are arranged along the feeding direction of the material 4A, and the molding of the header pipe 4 is performed sequentially and continuously.

At the required position of the header pipe 4, at the initial stage or in the middle of the bending process, insert holes 5 and 7 for inserting the partition plates 8, tubes 2 and side plates 6, and entrance and exit joints are inserted. Refrigerant inlets and outlets 14 and 15 are formed by press molding with a die, and then the process moves to the bending process again.

In the rounding process, both sides of the material 4A are slightly bent from the flat material 4A shown in Fig. 2a as shown in Fig. 2b, and then are shown in Figs. In this way, the material 4A is sequentially bent so as to gradually become round, and finally, as shown by e in FIG. 2, the joining ends 4B and 4B come into contact, and thereafter the whole becomes further round. It is rounded. Then, the respective members such as the flat tube 2, the wavy fin 3, the side plate 6, the partition plate 8, the entrance and exit joints 12, 13, and the like are assembled to the header pipe 4 thus formed, and they are integrated. As a result, the respective members are joined, and the joining ends 4B, 4B of the header pipe 4 are joined.

The aforementioned {inlet holes 5, 7} refrigerant outlet holes 14, 15 and the like are formed by press molding using a mold.

The tube insertion holes 5, 5 are formed in parallel in the longitudinal direction of the brazing sheet. The side plate insertion holes 6 are located at the upper and lower ends of the tube insertion holes 5, 5 formed in parallel. It is formed in parallel with the hole 5.

FIG. 3 is a diagram showing a schematic configuration of a header pipe 4 formed by rolling a blazing sheet 4A.

As shown in FIG. 3, the refrigerant inlet / outlet 14 (15) is formed at a position not adjacent to the tube insertion hole 5, that is, at a portion between the tube insertions 5, 5.

For example, when the refrigerant inlet / outlet 14 (15) is formed adjacent to the vicinity of the tube insertion hole 5, the holes widen due to the extensibility of the brazing sheet during the header pipe bending process described later. The tube insertion hole 5 and the refrigerant outlet hole 14 (15) are connected to each other, or the tube insertion hole 5 and the refrigerant outlet hole 14 (15) are close to each other. The strength of the brazing sheet between the entrance and exit holes 14 (15) decreases, the hole diameter and size, etc., formed during the header pipe bending process are deformed, and as a result, the header pipe 4 is significantly deformed. The case is conceivable.

FIG. 4 is a sectional view of the header pipe XX shown in FIG.

As shown in FIG. 4, when the refrigerant inlet / outlet 14 (15) is formed at a position located between the tube insertion holes 5, 5, the tube insertion hole 5 and the refrigerant inlet / outlet 14 (15) are formed. Is increased.

That is, unlike the conventional example, since the positions where the tube insertion holes 5 and 5 and the refrigerant inlet / outlet 14 are not adjacent to each other, the distance t1 between the tube insertion hole 5 and the refrigerant outlet / inlet 14 (15) is smaller than that of the conventional example. In addition, the interval T1 between the tube insertion hole 5 and the refrigerant inlet / outlet 14 is increased (T1> t1), the material strength is secured, and in the bending process, the tube insertion holes 5 and 5 due to the extensibility of the material. The deformation of the refrigerant inlet / outlet 14 (15) can be prevented.

As described above, since the tube inlet hole 5 and the refrigerant outlet hole 14 (15) are prevented from being deformed and the header pipe 4 is formed, the assembling property and the brazing property are improved. * In particular, when the refrigerant inlet / outlet 14 (15) is formed at a position having a predetermined angle α with respect to the virtual axis d in the longitudinal direction of the tube 2, the refrigerant inlet / outlet 14 near the tube insertion hole 5 is formed. (15) is formed. For this reason, the refrigerant inlet / outlet 14 (15) is formed at a position not adjacent to each tube insertion hole, that is, at a portion located between the tube insertion holes 5 and 5, so that the tube insertion hole 5 is formed. The spacing between the refrigerant inlet / outlet 14 (15) is increased, the material strength is secured, and the tube insertion hole 5 and the refrigerant inlet / outlet 14 (15) are prevented from being deformed during the bending process. The assemblability and brazing ability are improved, and the yield rate of non-defective products can be improved.

In this specific example, the angle α is approximately 115 ° to 144 °, preferably approximately 130 ° from the front direction to the rear direction.

If this angle is approximately 115 ° to 144 °, preferably approximately 130 °, the refrigerant inlet / outlet 14 (15) should have a certain distance from the tube insertion hole. As a result, the distance between the tube insertion hole and the refrigerant inlet / outlet hole is wider than in the conventional case, so that the material strength is secured and the tube insertion hole due to the extensibility of the material during the bending process.変形 It is possible to prevent the deformation of the refrigerant inlet / outlet port, and hence the header pipe.

The angle α is determined depending on the material of the header pipe, and is appropriately selected depending on the strength, spreadability, thickness, and the like of the material.

Further, the refrigerant inlet / outlet 14 (15) may be formed in the middle between the edge of the tube insertion hole 5 and the joining end 4 # of the header pipe.

Also in this case, the refrigerant inlet / outlet can have a certain distance from the tube insertion hole, so that the material strength is secured and the tube insertion hole due to the extensibility of the material during the bending process.防止 Prevents deformation of refrigerant inlet / outlet holes, and thus header pipe This is possible.

As described above, according to each specific example, since the refrigerant inlet / outlet hole formed in the header pipe is formed at a position located between a plurality of tube insertion holes formed in parallel, the tube insertion hole and the refrigerant Since the space between the entrance and exit holes is widened and the strength of the material is ensured, deformation such as enlargement of the hole can be prevented by the extensibility of the material. As a result, deformation of the tube insertion hole and the refrigerant outlet hole is prevented, and the assembling property and the brazing property are improved, so that the yield rate can be improved. Industrial applicability

INDUSTRIAL APPLICABILITY The present invention prevents deformation of a tube insertion hole, a refrigerant outlet hole, and, in turn, a header pipe, and improves assembling and brazing properties. Suitable for crucibles.

Claims

The scope of the claims

1. A heat exchanger header in which a fin is interposed between a plurality of stacked tubes, and the ends of the tubes are inserted into the tube insertion holes of a pair of header pipes to form a heat exchanger. In the pipe, the header pipe is formed by rolling a plate into a tubular shape,

The header pipe has a plurality of tube insertion holes into which tubes are inserted, and a refrigerant outlet hole through which a heat exchange medium flows in and out, and the refrigerant outlet hole is located at a position located between the tube insertion holes. A heat exchanger header pipe characterized by being formed.

2. The refrigerant inlet / outlet hole is characterized in that an imaginary line connecting the center of the hole and the center of the header pipe has a predetermined angle with respect to an imaginary axis in the longitudinal direction of the tube. Header pipe of heat exchanger described in item 1.

3. The heat exchanger header pipe according to claim 2, wherein the angle is approximately 130 degrees from the front direction to the rear direction.

4. The header pipe of the heat exchanger according to claim 1, wherein the refrigerant inlet / outlet hole is formed between the end of the tube insertion hole and the joining end of the header pipe.