JPH03244995A - Manufacture of heat exchanger - Google Patents

Abstract

PURPOSE:To prevent a tube from coming out of a header pipe by deforming the end of the tube to such an extent as to permit its engagement with the inner surface of the header pipe. CONSTITUTION:A long, flat aluminum plate having both or one side thereof cladded with wax material is bent and formed into a half-finished header pipe 1' with a U-shaped cross section and the curved part thereof is provided with a connecting hole 1d. In this bent condition, each and of a tube 2 is inserted into each of the connecting holes 1d. The end of the tube 2 in the header pipe 1' is pressed between two opposing forces and squeezed to such an extent that the tube end is extended slightly widthwise of the tube 2, where a deformed part 2a engageable with the inner surface of the header pipe 1' is formed. Even if this device is vibrated in a temporarily assembled condition, even the positional shifting of the tube 2 does not take place, much less chance of detachment thereof.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a method of manufacturing a heat exchanger used as a condenser for various types of cooling devices, a radiator for vehicles, and the like.

(Prior Art) Conventionally, as shown in FIG. 4, this type of heat exchanger is formed by bending a vertically long flat plate into a tubular shape and joining both edges in the width direction, and disposing the plates in parallel at predetermined intervals. Two header pipes 10, a plurality of uniformly flat tubes 11 connected by inserting both ends into connection holes 10a provided on the side surfaces of each header pipe 10, and a plurality of uniformly flat tubes 11 interposed between each tube 11. It is known that the header is composed of wavy heat transfer fins and allows a heat medium to flow between the header pipes 10 via tubes 11.

In addition, in the manufacturing of the heat exchanger, each header pipe 1
After joining both ends of tube 1, insert each tube 1 into the connection hole 10a.
Both ends of 1 are inserted, and this temporarily assembled state is thrown into a furnace and soldered.

(Problem to be solved by the invention) However, in the conventional heat exchanger, the header pipe 10
and tube 11 are transported into the furnace in a temporarily assembled state,
There is a problem that the insertion end of the tube 11 may come off the header pipe 10 and fall off due to vibrations during transportation, or the insertion position may be shifted, which may result in defective products or product variations. Ta.

In addition, in order to prevent this kind of situation, special jigs are sometimes used to fix the parts, but this is not convenient for mass production considering the cost of the jigs themselves and the labor involved in assembling and removing them. However, it also had the disadvantage of decreasing workability.

The present invention has been made in view of the above-mentioned problems, and its purpose is to provide a heat exchanger in which the tubes do not easily pull out from the header pipes even in a temporarily assembled state. be.

(Means for Solving the Problems) In order to achieve the above object, the present invention includes a tube for heat medium distribution on the side surface of a header pipe formed by bending a vertically long flat plate into a tubular shape and joining both ends in the width direction. In a method for manufacturing a heat exchanger formed by connecting header pipes, before joining both ends of the header pipe, the end of the tube is inserted into a correspondingly shaped connection hole provided in the header pipe, and at least one of the insertion tips of the tube is It is characterized in that the header pipe is deformed so that it can be locked onto the inner surface of the header pipe, and then both end edges of the header pipe are joined and the header pipe and the tube are joined.

(Function) According to the method for manufacturing a heat exchanger of the present invention, before joining both end edges of the header pipe, the end of the tube is inserted into the connection hole of the header pipe, and the insertion tip of the tube is inserted into the header pipe. By deforming the tube so that it can be locked on the inner surface of the header pipe, the deformed portion of the tube is locked on the inner surface of the header pipe, so that it cannot be easily pulled out.

(Embodiment) FIGS. 1 to 3 show an embodiment of the present invention.

In Fig. 3, reference numeral 1 denotes two header pipes arranged in parallel at a predetermined interval, the upper and lower ends of which are each sealed with a lid 1a, and a heat medium inlet 1b is provided on the upper side of one of the header pipes. , and a heat medium outlet IC is provided on the other lower surface. Further, in the side surface of the header pipe 1, connection holes 1d having a shape that approximately matches the cross section of the end of the tube 2, which will be described later, are bored at equal intervals in the axial direction of the header pipe 1. The header pipe 1 is formed by bending an elongated aluminum plate clad on both sides or one side with a brazing material into a circular tube shape and joining both ends in the width direction.

Reference numeral 2 denotes a plurality of flat aluminum tubes, both ends of which are inserted and connected to connection holes 1d of each header pipe 1, respectively, so that the heat medium can flow between the header pipes 1.

Reference numeral 3 denotes a heat transfer fin made of a corrugated thin plate, which is interposed between each of the tubes 2 arranged in parallel, and whose upper and lower ends are fixed to each tube 2.

Here, a method for manufacturing the heat exchanger configured as described above will be explained.

First, as shown in Fig. 1, a semi-finished header pipe 1' is formed by bending an elongated aluminum plate clad with brazing filler metal on both sides or one side into a U-shaped cross section. A connection hole 1d is drilled in advance.

Next, with the header pipe 1' bent into a U-shaped cross section, both ends of the tube 2 are inserted into each of the connection holes 1d.

Next, the tip of the tube 2 inserted inside the header pipe 1' is pressurized in the vertical direction as shown in Fig. 1, and this pressure crushes the inserted tip until it slightly extends in the width direction of the tube 2. As a result, a deformable portion 2a that can be locked onto the inner surface of the header pipe 1- is formed.

Then, as shown in Fig. 2, a circular header pipe 1 is formed by bringing together both ends of the header pipe 1' so as to enclose the insertion end of the tube 2, and this temporarily assembled state is thrown into a furnace. Both ends of the header pipe 1 and the header pipe 1 and the tube 2 are brazed together.

Here, if the tube 2 tries to be pulled out from the header pipe 1 due to vibrations during conveyance, etc., the deformed part 2a of the tube 2 will be caught on the inner surface of the header pipe 1, and the tube 2 will be pulled out in the opposite direction of insertion. Progress is blocked.

In this way, depending on the method of manufacturing the heat exchanger of this example,
Before joining both ends of header pipe 1, attach tube 2.
Connecting hole 1d of header pipe 1' in a semi-finished state at the end of
At the same time, the inserted tip of the tube 2 is deformed to form a deformed part 2a that can be locked to the inner surface of the header pipe 1', so even if it is subjected to vibration etc. in the temporarily assembled state, the tube 2 cannot be removed. Not only will it not come out, but it will not even shift in position.

Therefore, it is possible to reliably prevent the occurrence of defective products and product variations, and it is possible to always provide high-quality heat exchangers.

In the above embodiment, the deformable portion 2a is formed to extend on both sides of the tube 2 in the width direction, but the insertion tip of the tube 2 may be crushed in the width direction and deformed in the vertical direction. You can get the effect.

(Effects of the Invention) As explained above, according to the method for manufacturing a heat exchanger of the present invention, before joining both ends in the width direction of a vertically long flat plate serving as a header pipe, a tube is inserted into the connection hole of the header pipe. The end portion is inserted, the tip of the inserted end portion is deformed so that it can be locked on the inner surface of the header pipe, and the deformed portion is locked to prevent the tube from being pulled out from the header pipe. Even if the tube is subjected to vibrations or the like in a temporarily assembled state, the tube will not be pulled out or even displaced. Therefore, it is possible to reliably prevent the occurrence of defective products and product variations, and it is possible to always provide high-quality heat exchangers.

[Brief explanation of drawings]

1 to 3 show one embodiment of the present invention. FIGS. 1 and 2 are explanatory diagrams of the manufacturing process of a heat exchanger, and FIG. 3 is an overall perspective view of the heat exchanger. FIG. 4 is a partially exploded perspective view of a conventional heat exchanger. In the figure, 1...header pipe, 1-... header pipe in a semi-finished state, 1d... connection hole, 2... tube, 2a... deformed part, 3... heat transfer fin. Deformed part 2a An explanatory diagram of the manufacturing process of the heat exchanger Fig. 1 An explanatory diagram of the manufacturing process of the heat exchanger Fig. 2 To 1/Dur Vive 1a An overall perspective view of the heat exchanger Partially exploded perspective view of a conventional heat exchanger Diagram

Claims (1)

[Scope of Claim] A method for manufacturing a heat exchanger in which a tube for heat medium distribution is connected to a side surface of a header pipe formed by bending a vertically long flat plate into a tubular shape and joining both ends in the width direction, comprising: a header pipe; Before joining both end edges of the tube, the end of the tube is inserted into a correspondingly shaped connecting hole provided in the header pipe, and at least a portion of the insertion tip of the tube is deformed so as to be latched to the inner surface of the header pipe, After this, both ends of the header pipe are joined, and the header pipe and the tube are joined.