JPH01200088A - Sealed type rotary compressor - Google Patents

Abstract

PURPOSE:To prevent the leak of the gas inside a roller piston into a cylinder through the edge surface of a roller by forming a groove which is concentric to the roller piston over the whole periphery at the both edge surface of the roller piston and fitting an oil-impregnated metal powder sintered bearing into the groove. CONSTITUTION:The titled compressor is equipped with a compression device driven by a motor having a stator 2 and a rotor 3 which are housed in a sealed container 1. The compression device compresses the gas sucked from an intake pipe 9 by successively reducing the capacity of a compression chamber 13 formed between a vane 8, when a roller piston 6 fitted into the eccentric part 5 of a shaft 4 is revolved in a cylinder 7. After the compressed gas is opened into the sealed container 1, said gas is discharged from a discharge pipe 10. In this case, a groove 14 is formed concentrically with the roller piston 6 at the both edge surfaces of the roller piston 6. An oil-impregnated metal powder sintered bearing 15 is fitted into the groove 14, and the gap between the roller piston 6 and each plate 11, 12 is sealed.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a hermetic rotary compressor, and more particularly to reducing leakage at the end faces of its rollers.

2. Description of the Related Art In general, one method of increasing the efficiency of hermetic rotary compressors is to improve the accuracy of parts and reduce the clearance of seals.

The configuration of the conventional example will be explained below with reference to FIG.

In FIG. 3, a closed container 1 houses a motor having a stator 2 and a rotor 3, and a compression device driven by this motor. The compression device is an eccentric part 5 of the shaft 4
The roller piston 6 fitted in the roller piston 6 is rotated within the cylinder 7 by 40 rotations of the shaft, and the inside of the cylinder is partitioned by a bay 78 that is in pressure contact with the roller piston 6, so that the gas sucked through the suction pipe 9 is It is compressed continuously. After the compressed gas is stored in the closed container 1, it is discharged from the discharge pipe 1o.

Problems to be Solved by the Invention However, in the above configuration, the end face of the roller piston 6 slides on the surfaces of the motor side plate 11 and the non-motor side plate 12 while maintaining a certain clearance. Gas accumulated in the eccentric portion 5 of the shaft 4 leaks from this clearance and flows into the compression chamber 13, resulting in a problem that the efficiency of the compressor is reduced. On the other hand, if this Clearanne was made too small, the sliding resistance would increase, so it was not possible to make it too small.

Therefore, the present invention provides a compressor with less leakage at the end face of the roller piston.

Means for Solving the Problems In order to solve the above problems, the present invention provides a circular groove concentric with the roller piston over the entire circumference on the upper and lower end surfaces of the roller piston, and a sintered oil-impregnated bearing ring is fitted into the groove. It has the following configuration.

According to the above-described structure, the present invention has the structure that the gaps between the roller piston and the motor side plate and the anti-motor side plate are sealed by the oil impregnated in the sintered oil-impregnated bearing ring, and the gas on the inner surface of the roller piston is transferred to the roller end surface. It can prevent leakage into the cylinder through the Furthermore, the sliding resistance due to the contact surfaces between the sintered oil-impregnated bearing ring and the motor side plate and the anti-motor side plate can also be reduced by the oil impregnated in the sintered oil-impregnated bearing ring.

EXAMPLE Hereinafter, a hermetic rotary compressor according to an example of the present invention will be described with reference to the drawings.

FIG. 1 shows a cross section of a cylinder portion of a hermetic rotary compressor according to an embodiment of the present invention. FIG. 2 shows an enlarged view of the main part of FIG. 1. 14 is a groove provided on the upper and lower end surfaces of the roller piston 6 concentrically with the roller piston 6;
A sintered oil-impregnated bearing ring 16 is fitted into the groove 14, but the other configurations are the same as the conventional example. With the above structure, the gaps between the roller pinneton 6 and the motor side plate 11 and the motor side plate 12 are sealed by the oil impregnated in the sintered oil-impregnated bearing ring 16, and the gas on the inner surface of the roller piston 6 passes through the roller end face. leakage into the cylinder 7 can be prevented. Furthermore, the sliding resistance due to the contact surface between the sintered oil-impregnated bearing ring 15 and the motor side plate 11 or the non-motor side plate 12 can also be reduced by the oil impregnated in the sintered oil-impregnated bearing ring 15.

Effects of the Invention As described above, the present invention provides a circular groove concentric with the roller piston over the entire circumference on the upper and lower end surfaces of the roller piston, and a sintered oil-impregnated bearing ring is fitted into the groove. The gaps between the motor-side plate and the motor-side plate are sealed by the oil impregnated in the sintered oil-impregnated bearing ring, thereby preventing gas on the inner surface of the roller piston from leaking into the cylinder through the roller end face. In addition, the sliding resistance caused by the contact surfaces between the sintered oil-impregnated bearing ring and the motor side plate and the non-motor side plate can be reduced by the oil impregnated in the sintered oil-impregnated bearing ring, thereby providing a compressor with less leakage from the end face of the roller piston. can do.

[Brief explanation of the drawing]

Fig. 1 is a sectional view of the cylinder portion of a hermetic rotary compressor according to an embodiment of the present invention, Fig. 2 is an enlarged view of the main part of Fig. 1, and Fig. 3 is a sectional view of a conventional hermetic rotary compressor. It is. 1...Airtight container, 2...Stator, 3.
...Rotor, 6...Shaft, 6...
...Roller piston, 7. Old... Cylinder, 8...
... Vane, 11 ... Motor side fly), 1
2... Counter-motor side plate, 13...
Compression chamber, 14...Groove, 15...Sintered oil-impregnated bearing ring.

Claims (1)

[Claims] A motor having a stator and a rotor in a sealed container, a shaft rotated by the motor, a cylinder forming a compression chamber, a motor side plate and an anti-motor side plate closely attached to both surfaces of the cylinder, and the above-mentioned It has a compression device consisting of a roller piston that is inscribed in a compression chamber and rotates eccentrically, and a vane whose tip part is in pressure contact with the roller piston and partitions the compression chamber into high and low pressure sides. A hermetic rotary compressor characterized in that a circular groove is provided concentrically with the roller piston, and a sintered oil-impregnated bearing ring is fitted into the groove.