JPS63195488A - O ring type joint for piping of air conditioner for automobile - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to an O-ring type joint used for piping of an automobile air conditioner.

(Prior Art) In recent years, the joints of piping connections in automotive air conditioners are being changed from flare-type joints to O-ring-type joints that seal using O-rings.

A conventional O-ring type joint will be explained with reference to FIGS. 3 and 4.

Figure 3 is a cross-sectional view of a conventional O-ring type joint.

An O-ring type joint is an O-ring type fitting in which an O-ring 2 is attached to the end side of the flange portion 1a of a tube end-processed pipe 1 in which a flange portion 1a is formed near the tube end by beading, and an O-ring 2 is attached to the tube end side of the flange portion 1a. After fitting the union screw 4 fixed to the pipe end of the pipe 3 to be connected, the union nut 5 fitted to the pipe end 1 is tightened into the union screw 4.

FIG. 4 is a cross-sectional view showing the pipe end processed portion of the pipe 1, in which the side corner of the flange portion 1a of the pipe end 1b has a small circular arc surface as shown by the broken line A in the figure. It has a simple shape.

Returning to FIG. 3, by tightening the union screw 4 and the union nut 5, the O-ring 2 attached to the tube end 1b has the inner diameter chamfered surface 4a of the union screw 4 and the outer shape of the tube end 1b. It is compressed and fixed between the surface and the flat surface of the tube end side of the flange portion 1a, and exhibits a sealing effect.

FIG. 5 shows a configuration of a refrigeration cycle of an automobile air conditioner using such an O-ring type joint.

The refrigerant is adiabatically compressed by the compressor 7 driven by the engine 6 and becomes a high-temperature, high-pressure gas.

It is sent to a condenser 8 via a pipe 9. Liquid refrigerant cooled by outside air introduced by a fan is sent to a dry liquid receiver 10 through a pipe 11. The dehumidified liquid refrigerant is then sent via piping 13 to an evaporator 12 having an expansion valve (not shown). The refrigerant expands adiabatically through the expansion valve and becomes a low-temperature, low-pressure mist, which absorbs heat from the indoor air of the car in the evaporator 12 and becomes a low-temperature, low-pressure gaseous refrigerant.
4 is returned to the compressor 7. An O-ring type joint 15 is used at the connection between each device and the piping.

(Problems to be Solved by the Invention) However, in the above configuration, O
When fitting the ring 2, there was a problem in that the mounting position of the O-ring 2 was not determined, and the mounting position became uneven, resulting in poor workability during pipe connection work.

Furthermore, there was also the problem that the O-ring 2 fell off from the pipe end 1b during the work of sequentially connecting the component devices and the pipes.

The present invention solves the above-mentioned problems and provides an O-ring type joint for piping of an air conditioner for an automobile, which has good workability and always ensures a connection pipe.

(Means for Solving the Problems) In order to solve the above problems, the present invention forms an R groove on the outer circumferential surface of the base of the flange portion of the tube end portion to which the O-ring is attached.

(Function) With the above configuration, the O-ring fitted to the end of the end-processed pipe is securely attached to the corner of the flange part by the R groove, and there is no risk of it falling off, making the work easier. Improves quality and stabilizes quality.

(Example) Embodiments of the present invention will be described with reference to FIGS. 1 and 2.

FIG. 1 is a cross-sectional view showing a pipe end of a pipe of an O-ring type joint according to the present invention, in which an R groove IC is formed on the outer circumferential surface of the base of a flange portion 1a of a pipe end portion 1b.

FIG. 2 is a cross-sectional view of an O-ring type joint using the pipe 1 with a processed end shown in FIG.
After fitting the O-ring 2 into the R groove 1c formed at the base of the flange portion 1a, fit the union screw 4 fixed to the connected pipe 3 into the pipe end 1b, and then tighten the union nut 5. The union screw 4 is tightened together. The O-ring 2 attached to the R-groove IC is compressed and fixed between the chamfered surface 4a formed on the inner diameter of the tip of the union screw 4, the plane of the flange portion 1a, and the R-surface of the R-groove 1c, and serves as a seal. fulfill

The O-ring 2 fitted to the tube end 1b can be easily positioned by inserting it up to the R-groove IC, and will not fall off during work, resulting in good workability and stable quality. .

The present invention is also compatible with conventional O-ring type joints.

(Effects of the Invention) As explained above, according to the present invention, the R-groove formed at the end of the end-processed pipe allows the end-processed pipe to be installed in a fixed position in close contact with the flange, and does not fall off during work. Since there are no pipes, piping workability is improved and joint quality is stable.

Further, since the O-ring type joint according to the present invention is compatible with the conventional one, it can be replaced without changing the conventional piping design.

In the embodiment, the union screw 4 is fixed to the connected pipe 3, but it can also be attached directly to each component.
Of course, there is no difference in effectiveness.

[Brief explanation of the drawing]

FIG. 1 is a sectional view of a main part of a pipe with a processed end used in an O-ring type joint for piping of an automobile air conditioner according to the present invention;
Fig. 2 is a cross-sectional view of the O-ring type joint according to the present invention, Fig. 3 is a cross-sectional view of a conventional O-ring type joint, Fig. 4 is a cross-sectional view of a conventional pipe end, and Fig. 5 is an air conditioner for automobiles. FIG. 2 is a configuration diagram of the refrigeration cycle of the machine. 1... Pipe end processing pipe, 1a... Flange part, 1
b... Pipe end, 1c... R groove, 2... O-ring, 3... Connected pipe, 4... Union screw, 4a... Chamfered surface, 5... Union nut ,
6...Engine, 7...Compressor, 8...Condenser, 9,11゜13.14...Piping, 10...Dry receiver, 12...Evaporator, 15...・・O-ring type joint. Patent applicant: Matsushita Electric Industrial Co., Ltd. Figure 1 Figure 2 Figure 4 Figure 5 Pupils 86. - Condenser #i machine 9.11.13 j4-1 piping 1O-=e liquid receiver 12, -4 wil 5 shots No. 1 15- O-ring 10

Claims (1)

[Claims] An end-processed pipe with a flange formed near the pipe end, an O-ring attached to the pipe end of this pipe-end processed pipe, a union nut inserted from the non-processed end of the above-mentioned pipe-end processed pipe, and a pipe. In an O-ring type joint for automotive air conditioner piping, which consists of a union screw that fits into the end,
An O-ring type joint for piping of an automobile air conditioner, characterized in that an R groove is formed on the cylindrical outer peripheral surface of the base of the flange portion to which the O-ring at the end of the pipe is attached.