JPH02267389A - Rotary compressor - Google Patents

Abstract

PURPOSE:To seal a pressure difference so as to restrict an offset of the oil, etc., of an oil feeding pump from a shaft by press-fitting an O-ring between the cylindrical internal corner portion of a discharge cover and the conical portion of an auxiliary bearing in a compressive element stored in a closed container. CONSTITUTION:An oil is reserved and an electric drive element and compressive element are stored in a closed container. Also, an auxiliary bearing 15, supporting a shaft 8 and having a conical portion 14, located at a position opposite to the electric drive element side, a discharge valve, located at a position opposite to a cylinder surface side of the auxiliary bearing 15, and a discharge cover 19, fixed to the auxiliary bearing 15 so that it can cover the discharge valve and having a cylindrical internal surface corner portion 18, are at least provided for the compressive element. An O-ring 23 is press-fitted between the cylindrical internal surface corner portion 18 of the discharge cover 19 and the conical portion 14 of the auxiliary bearing 15. Thus, any pressure difference can be sealed, an offset of the oil pipe 22 of the oil feeding pump 20 from the shaft 8 can be restricted, and also the available load weight on the auxiliary bearing 15 can be increased.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a rotary compressor for a refrigeration cycle used in household refrigerators and the like.

BACKGROUND OF THE INVENTION In recent years, rotary compression in the refrigeration and air conditioning industry has become extremely popular, and it is now becoming the mainstream compressor for refrigerators and freezers.

An example of a conventional rotary compressor will be described below with reference to the drawings. 3 and 4 show a horizontal rotary compressor disclosed in Japanese Patent Publication No. 62-13095, in which oil/I/2 is stored in a closed container 1, a stator 3 and a rotor 4. The compression element 6 is fitted into a shaft 8 having an eccentric portion 7, a cylinder 10 forming a compression chamber 9, and an eccentric portion 7 of the shaft 8. A roller 11 rolling along the inner wall of the cylinder 10, and the roller 11
a vane 12 that is in contact with the outer periphery of the compression chamber 9 to partition the compression chamber 9 into a high pressure chamber and a low pressure chamber; a main bearing 13 on the electric element 5 side that seals both end surfaces of the cylinder 10 and pivotally supports the shaft 8; A sub-bearing 15A on the side opposite to the electric element 6 having a cylindrical cylindrical portion 24, and a counter-cylinder 10 of the sub-bearing 15A.
A discharge pulp 16 provided on the surface side, a discharge cover 19 having a baffle 17 and a cylindrical shape 25 fixed to the sub-bearing 15 so as to cover the discharge valve 16, and a discharge cover 19 provided on the non-electric element 6 side of the shaft 8. A refueling pump 2o is provided, and the refueling pump 20 is provided with a non-electric element 6 of the shaft 8.
It has a coil spring 21 fixed to a side tip, and an oil pipe 22 in which the coil spring 21 is fitted, one end is fixed to the discharge cover 19 by caulking, and the other end communicates with the oil 2. The inner surface 26 of the inner cylindrical shape 25 of the cover 19 is press-fitted and fixed to the outer surface 27 of the cylindrical portion 24 of the auxiliary bearing 15A.
A is equipped with a press-fit connection 28.

In the above configuration, a slight pressure difference between the inside of the discharge cover 19 and the inside of the closed container 1 is maintained between the inner surface 26 of the cylindrical shape 25 of the discharge cover 19 and the outer surface 27 of the cylindrical portion 24 of the sub-bearing 15A. It is sealed by press fitting, and prevents the function of the oil supply pump 20 for supplying oil to the shaft 8 by the rotation of the coil spring 21 from being impaired, and also restricts misalignment between the oil pipe 22 and the shaft 8.

Problems to be Solved by the Invention However, in the above configuration, the press-fit connection 28 is required in the auxiliary bearing 15A, and the actual bearing length J (shown in FIG. 3) of the auxiliary bearing 16A is shortened. However, there was a problem in that the bearing load was limited.

In view of the above-mentioned problems, the present invention provides a rotary compressor that secures the substantial bearing length of the auxiliary bearing without impairing the oil supply function.

Means for Solving the Problems In order to solve the above-mentioned problems, the rotary compressor of the present invention has a structure in which an O-ring is crimped between the cylindrical inner corner of the discharge cover and the conical part of the sub-bearing. It is something.

Effect of the present invention With the above-described configuration, the elastic force of the O-ring prevents lubrication function failure and misalignment between the shaft and the oil supply pipe, and also significantly reduces strain on the auxiliary bearing so that the actual bearing in the auxiliary bearing is If the length is increased, the possible load on the secondary bearing will increase.

EXAMPLE Hereinafter, a rotary compressor according to an example of the present invention will be described with reference to the drawings. Note that parts that are the same as those in the conventional example will be described using the same reference numerals, and parts that are the same in structure and operation will be omitted. In FIGS. 1 and 2, 15 is a sub bearing, and 23 is an O-ring. The auxiliary bearing 16 has a conical portion 14, and the O-ring 23 is crimped between the cylindrical inner corner portion 18 of the discharge cover 19 and the conical portion 14 on the auxiliary bearing 16.

In the above configuration, a slight pressure difference between the inside of the discharge cover 19 and the inside of the closed container 1 is transferred to the cylindrical inner corner part 18 of the discharge cover 19 and the conical part 14 of the sub-bearing 15.
sealing by crimping the O-ring 23 between the
This prevents the rotation of the coil spring 21 from impairing the function of the oil supply pump 2o that supplies oil to the shaft 8, and also restricts misalignment between the oil pipe 22 and the shaft 8. Furthermore, the elasticity of the O-ring 23 significantly reduces strain on the sub-bearing 15, eliminating the need for the press-fit connection 28 in the conventional example, and making it possible to increase the actual bearing length (2) of the sub-bearing 16.

Therefore, the possible load on the secondary bearing 15 can be increased without impairing the oil supply function.

Effects of the Invention As described above, the present invention seals the differential pressure and restricts misalignment between the oil pipe and the shaft by crimping an O-ring between the cylindrical inner corner of the discharge cover and the conical part of the sub-bearing. At the same time, it is possible to realize a rotary compressor that can increase the possible load on the sub-bearing without impairing the oil supply function.

[Brief explanation of drawings]

FIG. 1 is an enlarged sectional view of the main part of FIG. 2, FIG. 2 is a sectional view of a rotary compressor in an embodiment of the present invention, FIG. 3 is an enlarged sectional view of the main part of FIG. 4, and FIG. It is a sectional view of a rotary compressor in a conventional example. 1...Airtight container, 2...Oil, 3.
...Stator, 4...Rotor, 5...
...Electric element, 6... Compression element, 7...
・Eccentric part, 8...Shaft, 9...Compression chamber, 10...Cylinder, 11...Rotor, 12...Vane, 13...Main bearing, 14...Conical part, 15...Sub bearing, 16...Discharge valve, 18...
Cylinder inner corner part, 19... Discharge cover, 2
0... Oil supply pump, 21... Coil nipple ring, 22... Oil pipe, 23...
・○ ring. Name of agent: Patent attorney Shigetaka Awano and one other person

Claims (1)

[Claims] In addition to storing oil in a sealed container, an electric element and a compression element consisting of a stator and a rotor are housed, and the compression element includes a shaft having an eccentric portion, a cylinder forming a compression chamber, and a compression element of the shaft. A roller fitted to an eccentric part and rolling along the inner wall of the cylinder, a vane that comes into contact with the outer periphery of the roller and partitions the compression chamber into a high pressure chamber and a low pressure chamber, and a vane that seals both end surfaces of the cylinder. A main bearing on the side of the electric element that pivotally supports the shaft, a sub-bearing having a conical part on the side opposite to the electric element, a discharge pulp provided on the side opposite to the cylinder surface of the sub-bearing, and a discharge pulp so as to cover the discharge pulp. A discharge cover fixed to the sub-bearing and having a cylindrical inner corner part, and a fuel pump provided on the side of the shaft opposite to the electric element, the oil pump having a coil spring fixed to the tip of the shaft on the side opposite to the electric element. The coil spring is fitted therein, and one end is fixed to the discharge cover, and the other end has an oil pipe communicating with the oil, and the cylindrical inner corner part of the discharge cover and the conical part of the sub-bearing are connected to each other. A rotary compressor characterized by having an O-ring crimped in between.