JPS5925903B2 - aluminum pressure vessel - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an aluminum pressure vessel, such as a liquid receiver or an accumulator of a cooling device, which is made of an aluminum material and houses a refrigerant pipe therein, and relates to a mounting structure of the refrigerant pipe. The present invention also provides a pressure vessel that facilitates the installation of pipe joints and has excellent productivity.

As an example of a conventional pressure vessel, the structure of an accumulator made of aluminum is shown in FIG. 1. In FIG. 1, an upper lid 1 constituting one side of the cylindrical body has a flange portion 2a projecting inward by burring.

3a, and an opening 2b having a slightly smaller diameter than the inner diameter of the flange portion.
3b are formed.

A refrigerant suction pipe 4 bent in a square shape is connected to one of the locking parts 2 and 3, and a relatively short refrigerant discharge pipe 5 is connected to the other.

This connection is made using enlarged portions 4a for positioning formed near the pipe ends of the refrigerant suction pipe 4 and the refrigerant discharge pipe 5, respectively.
Both tubes are inserted up to 5a into the openings 2b and 3b, and the tube ends are expanded and fixed.

Reference numerals 1 and 8 designate pipe joints, whose cylindrical ends 7a and 8a are flange portions 2a of the upper lid 1.

3a, and the contact portions of the pipe joints 7, 8 and the upper cover 1 are fixed by torch soldering or argon or arc welding.

Reference numeral 6 denotes a lower lid, which is fitted onto the upper lid 1 and brazed.

. In manufacturing the accumulator with the above configuration, since the refrigerant suction pipe 4 and the refrigerant discharge pipe 5 are each curved,
When expanding and fixing the pipes to the openings 2b and 3b of the top cover 1, a unique holding tool is required to hold both pipes, resulting in poor dimensional accuracy and a large amount of processing man-hours. Since they are each welded, it takes a lot of processing man-hours, and the heat during welding creates slack in the expanding part of the pipe, reducing vibration resistance.Furthermore, the flat surface of the upper cover 1 is designed to hold the pipe joints 7 and 8. There were drawbacks such as the need to take up sufficient space to do so.

The present invention overcomes the above-mentioned drawbacks and provides a method for manufacturing a small and lightweight pressure vessel with excellent productivity.

Hereinafter, one embodiment of the present invention will be described in detail according to the drawings.
The figure shows a pressure vessel, particularly an accumulator, manufactured according to the present invention, in which the refrigerant suction pipe 4 and the refrigerant discharge pipe 5 have enlarged portions 4a and 5a for positioning, respectively, in contact with the periphery of the opening of the upper lid 1, and their ends The part extends outward.

Both tubes and the upper lid 1 are brazed and fixed.

A pipe fitting 7 and a half union 9 are fitted into each pipe end.

FIG. 3 shows the connection structure between the upper lid 1 and both pipes.
, 10b is formed, and a refrigerant suction pipe 4 and a refrigerant discharge pipe 5 are formed in the opening, with enlarged portions 4a, 5 thereof.
The tube is inserted so that the tube end protrudes to the outside with positioning a.

Reference numeral 11 denotes a washer-shaped brazing material interposed between the enlarged portions 4a, 5a and the opening of the upper lid 1.

The upper lid of the above configuration:! : When the tube assembly is heated in a furnace while being held by a jig (not shown), the brazing material 1
1 is melted and the portions where the refrigerant suction pipe 4 and the refrigerant discharge pipe 5 contact the flange portions 10a, 10b and their vicinity are brazed.

Incidentally, as shown in FIG. 4, the flange portion 10a of the upper lid 1,
The refrigerant suction pipe 4 and the refrigerant discharge pipe 5, or the surface of at least one of the upper lid 1 may be coated with a brazing material. Therefore, there is no need to place the brazing material 11.

The upper lid 1 with the refrigerant suction pipe 4 and the refrigerant discharge pipe 5 brazed in the above manner is brazed into the lower lid 6 as shown in FIG. Finished by flaring the edges.

As described above, the aluminum pressure vessel according to the present invention has an opening having a flange portion formed by burring in the upper lid, and a refrigerant suction pipe and a refrigerant discharge pipe bent into a predetermined shape are connected to the enlarged part. The tube is inserted into the opening for positioning so that the tube end protrudes outward, and the contact portion between the tube and the flange and the vicinity thereof are brazed in a furnace to join the top cover and the tube. Compared to the conventional method, in which the refrigerant pipe is expanded and fixed inside the pressure vessel and the pipe joint is made of brazed material outside the top cover, the number of processing steps is significantly reduced, and it is possible to connect the refrigerant pipe to the outside without using a specially shaped pipe joint. It is possible to easily bend the protruding pipe portion, thereby providing a small and inexpensive pressure vessel, and even if the enlarged part is formed in a pipe made of a relatively soft material such as an aluminum pipe, the enlarged part can be placed inside the pressure vessel. Therefore, there is no possibility of reducing the withstand pressure.

Furthermore, since the material is automatically brazed in the furnace, it has the advantage of excellent airtightness.

[Brief explanation of the drawing]

FIG. 1 is a cross-sectional view of a conventional pressure vessel, FIG. 2 is a cross-sectional view of the pressure vessel of the present invention, and FIGS. 3 and 4 are cross-sectional views showing the connection structure of the refrigerant pipe and the upper cover of the present invention. 1: Upper lid, 4: Refrigerant suction pipe, 5: Refrigerant discharge pipe, 4a,
5a: Enlarged part, 10a, 10b: Flange part, 11
: Raw wood.

Claims (1)

[Claims] 1. An opening having a flange is formed in the upper lid of the pressure vessel, and a refrigerant suction pipe and a refrigerant discharge pipe made of aluminum material, which are bent into a predetermined shape and have an enlarged part at a predetermined position, are installed inside the pressure vessel. An aluminum pressure vessel, wherein the aluminum pressure vessel is fitted into the opening toward the outside using the enlarged portion for positioning, and a refrigerant suction pipe and a refrigerant discharge pipe are fixed to the flange portion by furnace brazing.