JPH08319972A - Welding method for suction piping for hermetic rotary compressor - Google Patents

Abstract

PURPOSE: To enhance seal performance of the high pressure part of a suction piping, to prevent reduction of compression efficiency, and to improve weld workability and reduce a cost. CONSTITUTION: A closed vessel 1 is provided at its interior with a motor-driven element 2 and a rotation compression element 4 driven by the crank shaft 3 of the motor-driven element 2. The rotation compression element 4. The rotation compression element 4 constitutes a compression chamber 7 in cooperation with a cylinder 5 and a piston roller 6 arranged in the cylinder 5 eccentrically rotatably by a crank shaft 3. A suction piping 10 is inserted through a suction port part 9, opened to the closed container 1, in a suction passage 8 for suction gas G formed in the cylinder 5 fronting on a compression chamber 7. An inside diameter part 10b at the tip of the suction piping 10 is fitted in an annular groove 81 formed in the suction passage 8 of the cylinder 5 and brought into pressure contact seal and a cooling device 20 is arranged at the inner side of the suction piping 10. With cooling operation by a cooling means 20 applied on a pressure contact seal portion, the suction port part 9 of the closed container 1 and the outside diameter part 10a of the suction piping 10 are welded at (a) to each other.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for welding a suction pipe in a hermetic rotary compressor mounted in, for example, an air conditioner or a refrigerator, and particularly to a high pressure portion of the suction pipe facing a suction passage of a cylinder. By devising the sealing structure, the sealing performance is enhanced, the compression efficiency is prevented from lowering, and the workability is improved.

[0002]

2. Description of the Related Art Conventionally, in a hermetic rotary compressor of this type, as shown in FIG. 4, as a rotary compression element 4 driven by a crankshaft 3 of an electric element 2 in a hermetic container 1, for example, 2 A pair of piston rollers 6 and 6 provided in a cylinder 5 composed of cylinders are alternately eccentrically rotated by a crankshaft 3 of an electric element 2, and a compression chamber 7 formed by the cylinder 5 and the piston roller 6 is provided. The suction passage 8 for the suction gas G formed in the cylinder 5 is exposed, and the suction pipe 10 is externally inserted into the suction passage 8 through the suction port portion 9 opening in the closed container 1. Some have a configuration in which G is supplied to the compression chamber 7.

As shown in FIG. 5, the structure of sealing the suction pipe 10 in the conventional hermetic rotary compressor with the high pressure portion has a suction pipe 9 at the suction port 9 of the hermetic container 1.
When welding the outer diameter portion 10a of 0, the press-fitting tube 11 is inserted into the suction passage 8 of the cylinder 5 in a press-fitted state, or the bush 12 is press-fitted into the press-fitting tube 11 as shown in FIG. After the outer diameter portion 11a of the pressure contact tube 11 is pressure-contacted with the inner diameter portion 8a of the suction passage 8, the suction pipe 1 is attached to the pressure contact tube 11.
This is done by connecting 0s.

[0004]

However, in the above-described hermetic rotary compressor having the conventional structure, the heat generated when the suction port 9 of the hermetic container 1 and the suction pipe 10 are welded to the suction passage 8 of the cylinder 5. Transmitted to the pressure welding seal part side with the pressure welding tube 11,
The pressure contact portion of the pressure contact tube 11 is deformed due to thermal expansion due to heating and contraction due to cooling to deteriorate the sealing performance and adversely affect the compression efficiency, as well as the pressure contact tube 11 for connecting the suction pipe 10, A bush 12 or the like is required to ensure the pressure contact seal of the cylinder 5 to the suction passage 8, and the number of parts to be assembled is large, the welding work is complicated, and the cost is high.

An object of the present invention is to improve the sealing performance with the high-pressure portion of the suction pipe, prevent the compression efficiency from lowering, improve the welding workability, and reduce the cost. To provide a welding method for suction pipes in a machine.

[0006]

In order to solve the above-mentioned problems, the present invention comprises an electric element in a closed container and a rotary compression element driven by the crankshaft of the electric element. The compression element forms a compression chamber with a cylinder and a piston roller that is eccentrically rotatably provided in the cylinder with the crankshaft, and the compression gas is formed in a suction gas suction passage formed in the cylinder facing the compression chamber. A suction pipe is inserted through a suction port opened in a closed container, and an inner diameter portion of the tip of the suction pipe is fitted into an annular groove formed in the suction passage of the cylinder to seal by pressure and a cooling means is provided inside the suction pipe. Is provided and the suction port of the closed container and the outer diameter portion of the suction pipe are welded to each other while the cooling action of the cooling means is applied to the pressure-contact seal portion.

The present invention further includes an electric element in a closed container and a rotary compression element driven by a crankshaft of the electric element, the rotary compression element being a cylinder and the crank in the cylinder. A compression chamber is formed with a piston roller that is eccentrically rotatable about a shaft, and a suction pipe is inserted into a suction gas suction passage formed in the cylinder facing the compression chamber through a suction port opening in the closed container. Then, a seal ring made of an elastic material is interposed between the outer diameter portion of the suction pipe and the inner diameter portion of the suction passage of the cylinder for sealing, and cooling means is provided inside the suction pipe. The suction port portion of the closed container and the outer diameter portion of the suction pipe are welded to each other while imparting a cooling action to the seal portion.

Furthermore, the present invention comprises an electric element in a closed container and a rotary compression element driven by a crankshaft of the electric element, the rotary compression element being a cylinder and the crank in the cylinder. A compression chamber is formed with a piston roller that is eccentrically rotatable about a shaft, and a suction pipe is inserted into a suction gas suction passage formed in the cylinder facing the compression chamber through a suction port opening in the closed container. Then
While sealing the outer diameter portion of the suction pipe and the inner diameter portion of the suction passage of the cylinder with an adhesive, the suction port portion of the closed container and the outer diameter portion of the suction pipe are welded to each other,
It is characterized in that the adhesive is cured by the heat during the welding.

[0009]

That is, according to the present invention, by adopting the above-mentioned configuration, the suction port portion opened in the closed container is passed through the suction gas suction passage formed in the cylinder facing the compression chamber in the rotary compression element in the closed container. Insert the suction pipe, fit the inner diameter of the tip of this suction pipe to the annular groove formed in the suction passage of the cylinder, press-contact seal, and provide the cooling means inside the suction pipe. Since the suction port portion of the closed container and the outer diameter portion of the suction pipe are welded to each other while being applied, heat during welding does not transfer to the pressure welding seal portion between the suction pipe and the cylinder.
Deformation of the pressure contact part of the suction pipe as in the past is prevented, which improves the sealing performance with the high pressure part of the suction pipe, prevents the compression efficiency from decreasing, and reduces the number of parts to be assembled at the pressure contact seal part. It is possible to improve welding workability and reduce cost.

Further, a seal ring made of an elastic material is interposed between the outer diameter portion of the suction pipe and the inner diameter portion of the suction passage of the cylinder for sealing, and a cooling means is provided inside the suction pipe to cool this. The heat of welding is transferred to the sealing portion between the suction pipe and the cylinder so that the suction port of the closed container and the outer diameter portion of the suction pipe are welded to each other while providing the cooling action by the means. As a result, deterioration of the seal ring is prevented, which improves the sealing performance with the high-pressure portion of the suction pipe, prevents a decrease in compression efficiency, and improves welding workability.

Further, the outer diameter portion of the suction pipe and the inner diameter portion of the suction passage of the cylinder are sealed with an adhesive, and the suction port portion of the closed container and the outer diameter portion of the suction pipe are welded to each other. ,
Since the adhesive is hardened by the heat during this welding, even if the suction pipe is deformed due to the transfer of heat during welding, the sealability of the seal area is secured by the adhesive, which Further, the sealing performance with the high pressure portion of the suction pipe is improved, the reduction of compression efficiency is prevented, and the welding workability is improved.

[0012]

Embodiments of the present invention will now be described in detail with reference to the drawings shown in FIGS. In the illustrated embodiment of the present invention, portions having the same structures as those of the conventional structure shown in FIGS. 4 to 6 will be described using the same reference numerals.

FIG. 1 shows a first embodiment of a method for welding a suction pipe in a hermetic rotary compressor according to the present invention.

This hermetic rotary compressor has an overall structure basically the same as that of the conventional structure shown in FIG.
As the rotary compression element 4 driven by the crankshaft 3 of the electric element 2 in the closed container 1, for example, a pair of piston rollers 6 and 6 provided in a cylinder 5 consisting of two cylinders is used as the crankshaft 3 of the electric element 2. Are alternately eccentrically rotated in the compression chamber 7 formed by the cylinder 5 and the piston roller 6,
The suction passage 8 for the suction gas G formed in the cylinder 5 is exposed, and the suction pipe 10 is externally inserted into the suction passage 8 through the suction port portion 9 opening in the closed container 1. It has a configuration in which G is supplied to the compression chamber 7.

To seal the suction pipe 10 with the high pressure portion, an annular groove 81 is formed in the suction passage 8 of the cylinder 5, and the annular groove 81 has a distal end inner diameter portion 1 of the suction pipe 10.
0b is fitted and sealed by pressure contact, and a cooling device 20 as a cooling means is provided inside the suction pipe 10. The suction port of the closed container 1 is provided while the cooling action of the cooling device 20 is applied to the pressure contact seal portion. Part 9 and the suction pipe 1
No. 0 outer diameter portion 10a is welded to each other, and the cooling device 20 circulates and supplies a cooling medium W such as water to locally cool a corresponding portion of the pressure contact seal portion from a guide tube 21. As a result, heat generated during welding causes the annular groove 81 of the suction passage 8 and the tip inner diameter portion 10 of the suction pipe 10.
It is designed so as to prevent transmission to the pressure-contacting seal portion with b.

FIG. 2 shows a second embodiment according to the present invention, in which the high pressure portion of the suction pipe 10 is sealed with
The inner diameter portion 8a of the suction passage 8 of the cylinder 5 and the suction pipe 10
The seal ring 31 made of an elastic material such as rubber or synthetic resin is interposed between the outer diameter portion 10a and the outer diameter portion 10a, and a cooling device 20 as a cooling means is provided inside the suction pipe 10. While the cooling action of 20 is applied to a considerable portion of the sealing portion, the suction port portion 9 of the closed container 1 and the outer diameter portion 10a of the suction pipe 10 are welded to each other. 8 and the suction pipe 10 are prevented from being transmitted to the sealed portion.

Further, FIG. 3 shows a third embodiment according to the present invention, in which the high pressure portion of the suction pipe 10 is sealed with the inner diameter portion 8a of the suction passage 8 of the cylinder 5 and the outside of the suction pipe 10. The adhesive 41 is interposed between the diameter portion 10a and the adhesive 41, and the hardening treatment of the adhesive 41 is performed by welding the suction port portion 9 of the closed container 1 and the outer diameter portion 10a of the suction pipe 10 to each other. By using the heat generated at the time of welding, even if the suction pipe 10 is deformed due to the transfer of heat during welding, the adhesive 41
This ensures the sealing property of the sealing part.

[0018]

As is apparent from the above description, the present invention includes an electric element in a closed container and a rotary compression element driven by the crankshaft of the electric element. A compression chamber is formed by a cylinder and a piston roller eccentrically rotatably provided in the cylinder by the crankshaft, and an opening is formed in the closed container in a suction gas suction passage formed in the cylinder facing the compression chamber. The suction pipe is inserted through the suction port, and the inner diameter of the tip of the suction pipe is fitted into the annular groove formed in the suction passage of the cylinder for pressure contact sealing, and cooling means is provided inside the suction pipe. Since the suction port of the closed container and the outer diameter of the suction pipe are welded to each other while giving a cooling action by the heat transfer, heat during welding is transferred to the pressure welding seal part between the suction pipe and the cylinder. It is possible to prevent the deformation of the pressure contact portion of the suction pipe as before, thereby improving the sealing performance with the high pressure portion of the suction pipe, and preventing a decrease in compression efficiency. In addition, the number of parts to be assembled at the press-contact seal portion is small, and welding workability can be improved and cost can be reduced.

Further, in claim 2, a seal ring made of an elastic material is interposed between the outer diameter portion of the suction pipe and the inner diameter portion of the suction passage of the cylinder for sealing, and cooling means is provided inside the suction pipe. Is provided and the suction port portion of the closed container and the outer diameter portion of the suction pipe are welded to each other while the cooling action is provided by the cooling means. It is possible to prevent deterioration of the seal ring without being transmitted to the seal site,
As a result, the sealing performance with the high pressure portion of the suction pipe can be improved, the compression efficiency can be prevented from lowering, and the welding workability can be improved.

Further, according to claim 3, the outer diameter portion of the suction pipe and the inner diameter portion of the suction passage of the cylinder are sealed with an adhesive, and the suction port portion of the closed container and the outer diameter portion of the suction pipe are sealed. Are welded to each other and the adhesive is hardened by the heat at the time of welding. Therefore, even if the suction pipe 10 is deformed by the transfer of heat at the time of welding, the adhesive 41 seals It is possible to secure the sealing property, which can enhance the sealing performance with the high-pressure portion of the suction pipe, prevent the compression efficiency from decreasing, and
Welding workability can be improved.

[Brief description of drawings]

FIG. 1 is an enlarged sectional view of an essential part showing a first embodiment of a method for welding a suction pipe in a hermetic rotary compressor according to the present invention.

FIG. 2 is an enlarged cross-sectional view of a main part showing a second embodiment according to the present invention.

FIG. 3 is an enlarged sectional view of an essential part showing a third embodiment according to the present invention.

FIG. 4 is a cross-sectional view of the entire configuration of a conventional hermetic rotary compressor.

FIG. 5 is an enlarged sectional view of an essential part showing the welding structure of the suction pipe in the conventional hermetic rotary compressor.

FIG. 6 is an enlarged sectional view of an essential part showing another example of the welding structure of the suction pipe in the conventional hermetic rotary compressor.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Airtight container, 2 ... Electric element, 3 ... Crank shaft, 4 ... Rotary compression element, 5 ... Cylinder, 6,6 ... Piston roller, 7, 7 ... Compression chamber, 8 ... suction passage, 8a ... inner diameter portion, 81 ... annular groove, 9 ... suction inlet portion, 10 ... suction pipe, 10a ... outer diameter portion, 10b ... -Inner diameter portion, 20 ... Cooling device, 31 ... Seal ring, 41 ... Adhesive agent, a ... Welded portion, G ... Intake gas.

Claims (3)

[Claims] 1. A hermetically sealed container is provided with an electric element and a rotary compression element driven by a crankshaft of the electric element, the rotary compression element being provided in a cylinder and eccentric in the cylinder at the crankshaft. A compression chamber is formed by a rotatably provided piston roller, and a suction pipe is inserted into a suction gas suction passage formed in the cylinder facing the compression chamber through a suction port opening in the closed container. While fitting the inner diameter of the tip of the pipe into an annular groove formed in the suction passage of the cylinder for pressure contact sealing, a cooling means is provided inside the suction pipe, and the cooling action by the cooling means is applied to the pressure contact sealing portion. A method for welding suction pipe in a hermetic rotary compressor, comprising welding an inlet port of the closed container and an outer diameter portion of the suction pipe to each other. 2. A hermetically sealed container comprising an electric element and a rotary compression element driven by a crankshaft of the electric element, the rotary compression element being a cylinder, and an eccentric member in the cylinder at the crankshaft. A compression chamber is formed by a rotatably provided piston roller, and a suction pipe is inserted into a suction gas suction passage formed in the cylinder facing the compression chamber through a suction port opening in the closed container. While sealing by interposing a seal ring made of an elastic material between the outer diameter portion of the pipe and the inner diameter portion of the suction passage of the cylinder,
A hermetically sealing structure characterized in that cooling means is provided inside the suction pipe, and the suction port portion of the closed container and the outer diameter portion of the suction pipe are welded to each other while the cooling effect of the cooling means is applied to the sealing portion. Method for Welding Suction Pipe in Rotary Compressor. 3. A hermetically sealed container comprising an electric element and a rotary compression element driven by a crankshaft of the electric element, the rotary compression element being a cylinder and an eccentric member in the cylinder at the crankshaft. A compression chamber is formed by a rotatably provided piston roller, and a suction pipe is inserted into a suction gas suction passage formed in the cylinder facing the compression chamber through a suction port opening in the closed container. The outer diameter portion of the pipe and the inner diameter portion of the suction passage of the cylinder are sealed with an adhesive, and the suction port portion of the closed container and the outer diameter portion of the suction pipe are welded to each other. A method for welding suction pipes in a hermetic rotary compressor, characterized in that the adhesive is hardened by heat.