JPS6257907B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a pressure vessel for a cooling system, such as a receiver tank attached between a condenser and a pressure reducing valve to store liquid refrigerant, or a receiver tank attached between an evaporator and a compressor to store gaseous refrigerant. This relates to a method for manufacturing an accumulator that draws refrigerant into a compressor.Each part constituting the pressure vessel is made of aluminum or an aluminum alloy, and the joining method, especially near the joint members, has been improved to ensure that the upper cylinder, joint members, and refrigerant This allows the outlet pipe and inlet pipe to be joined at the same time.

As shown in FIG. 1, a conventional pressure vessel for a cooling device, for example, an accumulator, has an upper cylinder 1 made of cold-cast or melt-cast aluminum and has communication holes 1.
It is formed into a cylindrical shape with a bottom and has a lower cylinder 2.
is formed by pressing a thin plate of aluminum into a cylindrical shape with a bottom. Communication hole 1 of upper cylinder 1
A refrigerant outlet pipe 3 and an inlet pipe 4 made of aluminum are respectively connected to a and 1b.
The joint is a step part 3 for positioning on both pipes respectively.
a, 4a are formed, and after both tubes are fitted into the communication holes 1a, 1b, the open ends 3b, 4b are expanded,
It is fixed to the upper cylinder 1. An upper cylinder 1 to which an outlet pipe 3 and an inlet pipe 4 are fixed is fitted into a lower cylinder 2, and the fitting part is welded with tungsten inert gas (TIG welding) to complete the accumulator. Therefore, the expanded tube portion is securely fixed, and the directions of the U-shaped outlet tube 3 and the L-shaped inlet tube 4 are as follows.
It is necessary that it be maintained as specified.

However, in such a manufacturing method, the expanded tube portion is rapidly heated due to the extremely high temperature heat generated during TIG welding of the upper tube 1 and the lower tube 2 being transferred through the upper tube 1. The expansion and contraction due to heat causes the aluminum to become brittle, and due to the characteristics of aluminum, its elastic modulus is originally small, and the expansion force of the tube expansion section is weak.
For this reason, there have been disadvantages in that the expanded tube portion may become loose or the outlet tube 3 or the inlet tube 4 may fall off due to vibrations received during use of the pressure vessel.

Therefore, in order to eliminate the above-mentioned drawbacks, this invention uses a thin plate crimped with brazing material to manufacture the upper tube, eliminates the expansion of the outlet and inlet tubes, performs furnace brazing, and Another object of the present invention is to provide a method for manufacturing a pressure vessel for a cooling device, which can securely fix an inlet pipe and prevent the outlet pipe and the inlet pipe from loosening or coming off. Therefore, the gist of the present invention is to press a thin plate made of aluminum material with a brazing material crimped onto one surface to form an upper cylinder including a through hole having a cylindrical part extending inward. Then, a refrigerant outlet pipe and an inlet pipe made of an aluminum material are fitted from the inside of the through hole, and a joint member made of an aluminum material is seated on the outside of the through hole, and then the upper cylinder and the joint member are fitted. The method further includes the step of heating an assembly having an outlet pipe and an inlet pipe in a furnace, and brazing the joint member, the outlet pipe, and the inlet pipe to the upper cylinder with a brazing material of the upper cylinder. Therefore, unlike the conventional case, the outlet pipe and the inlet pipe are not expanded and joined to the upper cylinder, but are firmly fixed by brazing, so that the above object can be achieved.

Examples of this invention will be described below with reference to the drawings.

In FIGS. 2 and 3, the upper cylinder 1 is formed by pressing a thin plate of aluminum material with a brazing sheet pressed onto one side, and a cylindrical part 6 extending inward during the pressing process. Through holes 5a and 5b are formed. At this time, the brazing material is formed inside the bottomed cylinder. The lower cylinder 2 is also formed into a cylindrical shape with a bottom by pressing a thin plate of aluminum material. Opening end 2a of the lower cylinder 2
is slightly enlarged so as to fit on the outside of the upper cylinder 1. The joint members 6a, 6b are also made of aluminum material, and the open end 7 has an outer diameter that is approximately the same as the diameter of the through holes 5a, 5b for positioning when fitting into the through holes 5a, 5b. The stepped portion has a diameter. The refrigerant outlet pipe 3 and inlet pipe 4 are also made of aluminum and have stepped portions 3a, 4a for positioning when inserted into the through holes 5a, 5b.

When manufacturing the accumulator, the refrigerant outlet pipe 3 and inlet pipe 4 are inserted into the through holes 5a and 5b of the upper cylinder 1 until the respective steps 3a and 4a abut against the edges of the through holes 5a and 5b. The opening ends 7 of the joint members 6a, 6b are inserted into the through holes 5a, 5b from the outside direction of the upper cylinder 1, and the joint members 6a, 6 are inserted into the through holes 5a, 5b.
The end face 8 of b is seated on the outer part of the upper cylinder 1. Then, the upper cylinder 1 is further fitted into the open end 2a of the lower cylinder 2. When these assemblies are heated in a furnace, the brazing filler metal crimped to the outer surface of the upper cylinder 1 melts, as shown by B in FIG. A fillet is formed between the end face 8 and the outer periphery of the cylindrical portion 6 of the through holes 5a and 5b, the outlet pipe 3, and the inlet pipe 4, and their vicinity, and both pipes and the coupling member are brazed to the upper cylinder. Ru. At the same time, the fitting portion between the open end 2a of the lower cylinder 2 and the upper cylinder 1 is also brazed.

In addition, if the upper cylinder and lower cylinder cannot withstand the heat in the furnace when storing desiccant material in the lower cylinder, connect the joint member, outlet pipe, and inlet pipe to the upper cylinder in the furnace. , the upper and lower tubes may be TIG welded.

In this embodiment, an accumulator has been described, but a receiver tank having a similar configuration can also be manufactured using exactly the same method.

As mentioned above, the pressure vessel according to the present invention is
A thin plate made of aluminum material with brazing material crimped onto one side is pressed to form an upper cylinder including a through hole having a cylindrical portion, and an outlet pipe and an inlet pipe are fitted inside the through hole of this upper cylinder. , the joint member is seated on the outside of the through hole, and these are heated in a furnace and bonded to the upper cylinder with a brazing filler metal, so that the outlet pipe and the inlet pipe do not fit into the communication hole of the upper cylinder as in the conventional case. Connections are not made by expanding the pipe, which reliably prevents loosening due to heat processing or coming off due to vibration, thereby eliminating the lack of function as a pressure vessel and shortening of product life. Furthermore, manufacturing costs can be reduced by eliminating processing steps.

[Brief explanation of the drawing]

FIG. 1 is a sectional view of a conventional pressure vessel, FIG. 2 is a sectional view of a pressure vessel according to the present invention, and FIG. 3 is an enlarged view of essential parts of the present invention. 1...Upper tube, 2...Lower tube, 3...Outlet pipe, 4...
...Inlet pipe, 5a, 5b...Through hole, 6...Cylindrical part,
6a, 6b...Joint members.

Claims (1)

[Claims] 1 An upper cylinder 1 including through holes 5a and 5b having a cylindrical part 6 extending inward by pressing a thin plate made of aluminum material with a brazing material crimped on one surface.
A refrigerant outlet pipe 3 and an inlet pipe 4 made of aluminum are fitted from the inner side of the through holes 5a, 5b, and a joint member 6a made of aluminum is fitted in the outer part of the through holes 5a, 5b. , 6b are seated, and then the upper cylinder 1 and the joint members 6a, 6 are seated.
b. The assembly having the outlet pipe 3 and the inlet pipe 4 is heated in a furnace, and the coupling members 6a, 6 are attached to the upper tube 1.
b. A method for manufacturing a pressure vessel for a cooling device, comprising the step of brazing the outlet pipe 3 and the inlet pipe 4 with the brazing material of the upper cylinder 1.