JPH0331595A - Suction pipe connecting device of rotary compressor - Google Patents

Abstract

PURPOSE:To abolish heating of a suction portion and to prevent deformation of a closed container or the like by mutually overlapping a contraction portion of a suction pipe, an expanded portion of the suction pipe and an expansion portion of a sleeve pipe in case of connecting an intake pipe communicated with an external refrigerant circuit to a compressor. CONSTITUTION:At the time of connecting an intake pipe 6 communicated with an external refrigerant circuit in a rotary compressor 1, first a sleeve pipe 11 is welded to a hole 9 of a closed container 2. A cylinder 3 is joined to the interior of the closed container 2 in such a manner that an intake passage 10 is aligned with the hole 9. Further, a suction pipe 13 is inserted extending over the sleeve pipe 11 and the intake passage 10 in such a manner that an expanded portion 14 is inscribed in an expanded portion 12 of the sleeve pipe 11. Subsequently, an inner pipe 15 is pressed in the suction pipe 13 so as to enhance the sealing ability between the sleeve pipe 11 and the intake passage 10. Lastly, the contraction portion 16 of the intake pipe 6 is brought into contact with the expanded portion 14 of the suction pipe 13, and electrodes are pressed to the inside and outside of the overlapping portion to perform resistance welding, whereby three pipes 6, 11, 13 are joined mutually.

Description

DETAILED DESCRIPTION OF THE INVENTION (A) Field of Industrial Application The present invention relates to a suction pipe connection device for a rotary compressor for refrigerant used in refrigerators, showcases, etc.

(B) Prior Art Conventionally, most suction pipe connecting devices for rotary compressors of this type have a structure as disclosed in Japanese Utility Model Application Publication No. 180690/1983. To connect the compressor cylinder and suction pipe, first weld a sleeve pipe to the hole in the sealed container, and then insert the cylinder into the sealed container so that the suction passage matches the sleeve pipe. Welding 0 Next, after inserting a suction pipe across both the sleeve pipe and the suction passage of the cylinder, press the inner pipe into the suction pipe in order to improve the sealing performance between the sleeve pipe and the suction passage. do. Then, insert the suction pipe to a predetermined position within the suction pipe,
After heating the suction pipe, suction pipe, and sleeve pipe with a burner, brazing material is poured into the gap between the six pipes and brazed together.

(c) Problems to be Solved by the Invention However, according to the above connection method, the suction pipe, the suction pipe, and the sleeve pipe are brazed while being heated by a burner, so the entire suction part including the closed container and cylinder is the same. This can cause heat distortion in the sealed container and cylinder, causing the roundness of the container to go out of order, changing the optimal clearance when assembling the compressor, causing problems in assembly work, and causing damage to the tack weld between the cylinder and the sealed container. Problems such as the separation of the cylinders and noise, and deformation of the cylinder bore resulting in poor compression occurred, which had a negative impact on performance and durability.

In addition, in order to deal with these problems, there is a method of joining the suction pipe, suction pipe, and sleeve pipe in one piece without brazing, and then filling the gap with adhesive, but in this case, Compared to welding, it is weaker and less durable, and it takes a long time to connect, making it unsuitable for mass production.

The present invention was developed in view of these points, and eliminates heating of the suction part to prevent deformation of the sealed container and cylinder bore, improves assembly workability and compressor performance, and improves durability and productivity. The purpose of the present invention is to provide a suction pipe connection device for a rotary compressor.

(d) Means for Solving the Problems The present invention includes a cylinder fixed in a closed container so that the suction passage is located in the hole of the container, and an enlarged portion fixed to the hole of the container at the end thereof. a suction pipe having an enlarged portion at the end and inserted into the sleeve pipe and into the suction passage of the cylinder such that the enlarged portion contacts the enlarged portion of the sleeve pipe; The suction pipe includes an inner tube that is press-fitted into the pipe, and a suction pipe that has a constriction portion at the end that matches the expanded portions and communicates with the external refrigerant circuit. The expanded portion of the pipe and the expanded portion of the sleeve tube are connected to the compressor by overlapping and resistance welding.

(*) Function The suction pipe connection device for a rotary compressor of the present invention has the above-described configuration, so that there is no need to heat the suction section including the suction pipe when connecting the suction pipe, and It is possible to prevent thermal deformation, maintain the optimum clearance when assembling the compressor, improve assembly workability, and improve performance by eliminating compression defects. Furthermore, since the strength of the connecting portion can be ensured, it is excellent in durability, and the connecting work is simple and does not require skill, and the working time can be shortened, so that productivity can be improved.

(f) Example Embodiments of the present invention will be described below based on the drawings.

Reference numeral 1 denotes a rotary compressor in which a rotary compressor section 4 including a cylinder 3 and an electric motor section 5 for driving the rotary compressor section 4 are housed in a closed container 2. Reference numerals 6 and 7 are a suction pipe and a discharge pipe that connect the compressor 1 to an external refrigerant circuit (not shown). 8 is an accumulator formed integrally with the suction pipe 6. 9 is airtight container 2
It is a hole formed in the side wall of. Reference numeral 10 denotes a suction passage formed in the cylinder 3, and the cylinder 3 is tack-welded to the inner wall of the closed container 2 so that this passage and the hole 9 coincide with each other. A sleeve tube 11 is welded to the hole of the hermetic container 2 and has an expanded portion 12 at its tip. Reference numeral 13 is a suction pipe which has a widening part 14 at the end thereof, and is completely inserted into the sleeve pipe 11 and the suction passage 10 so that the widening part 14 comes into contact with the widening part 12 of the sleeve pipe 11. be. 15
is an inner tube press-fitted into the suction pipe 13 to prevent gas leakage between the sleeve pipe 11 and the suction passage 10. Reference numeral 16 designates a constricted portion formed at the end of the suction pipe 6 so as to coincide with both the expanded portions 12 and 14. Then, the suction pipe 6 is resistance welded by overlapping the contracted part 16 of the pipe, the widened part 14 of the suction pipe 13, and the widened part 12 of the sleeve pipe 11, and applying electrodes to the inside and outside of this overlapping part. It is connected to the compressor by

Here, to explain the procedure of such a suction pipe connection device, first, the sleeve pipe 11 is welded to the hole 9 of the airtight container 2. Next, the suction passage 10 is aligned with the hole 9. The cylinder 3 is fixed within the closed container 2 by tack welding.

In this state, the inside of the sleeve pipe 11 and the suction passage lo are opened so that the widened part 14 is inscribed in the widened part 12 of the sleeve pipe 11.
Next, the inner tube 15 is press-fitted into the suction tube 13 to improve the seal between the sleeve tube 11 and the suction passage 10. Finally, the contracted part 16 of the suction pipe 6 is applied to the widened part 14 of the suction pipe 13, and the contracted part 16 and the widened part 12.14 are overlapped, and while being pressed, the inside and outside of the overlapped part are The three tubes 6, 11, and 13 are joined together by applying electrodes and resistance welding.

As shown in FIG. 3, in the above connection device, a desirable form is such that the angle of the expanded portion 14 of the suction pipe 13 is larger than the angle of the expanded portion 12 of the sleeve pipe 11 and the contracted portion 16 of the suction pipe 6. By doing so, when these overlapping parts are pressed, parts A and B in the figure can be brought into close contact with each other.
The two-stage seal structure can further improve the sealing performance at the overlapping portion after welding.

As described above, according to the suction pipe connection device for a rotary compressor of the present invention, the suction pipe 6 is resistance welded at its contracted portion 16 to the enlarged portions 12 and 14 of both the suction pipe 13 and the sleeve pipe 11. , there is no need to heat the suction pipe and other suction parts when connecting the suction pipe 6, it is possible to prevent thermal deformation of the inner diameter of the closed container 2 and the cylinder bore diameter, and the optimum clearance when assembling the compressor is eliminated. It is possible to improve assembly work efficiency by maintaining proper compression, and improve performance by eliminating compression defects. Further, it is possible to prevent the tack welding part between the closed container 2 and the cylinder 3 from coming off, and noise from the compressor can be prevented. Additionally, resistance welding ensures the strength of the connection, so durability can be maintained. Furthermore, since the connection work does not require skill unlike brazing, it can be done simply and reliably in a short time, improving productivity.

()) Effects of the Invention As described above, according to the present invention, heating of the suction part can be abolished, so deformation of the closed container and cylinder bore can be prevented, and assembly workability and compressor performance can be improved. It is possible to provide a connection device with excellent performance and durability.

[Brief explanation of drawings]

FIG. 1 is a cutaway front view of a rotary compressor showing an embodiment of the present invention, FIG. 2 is a sectional view of a suction pipe connection device, and FIG.
The figure is an enlarged sectional view of the main part of FIG. 2. 2...Airtight container, 3...Cylinder, 6...
Suction pipe, 9... hole, 10... suction passage,
11... Sleeve tube, 12... Expanded part, 1
3... Suction tube, 14... Expansion part, 15... Internal intubation tube, 16... Contraction part.

Claims (1)

[Claims] (1) A cylinder fixed in a sealed container such that the suction passage is located in the hole of the container, a sleeve tube fixed to the hole of the container and having an expanded portion at its end; a suction pipe having an opening and inserted into the sleeve pipe and into the suction passage of the cylinder such that the expanded part contacts the expanded part of the sleeve pipe; and an inner insertion tube press-fitted into the suction pipe;
A suction pipe is provided with a constriction part at the end that matches the enlarged parts and communicates with the external refrigerant circuit, and the suction pipe has a constriction part of the suction pipe, an enlarged part of the suction pipe, and a sleeve pipe. A suction pipe connection device for a rotary compressor, characterized in that the suction pipe connection device for a rotary compressor is connected to the compressor by overlapping and resistance welding the expanded portion.