JPH03189393A - Rotary type compressor - Google Patents

Abstract

PURPOSE:To suppress wear of a side plate and to improve reliability by forming chamfering (escape), having an area larger than that of chamfering of the end surface of a tip seal, in the end part of the inner peripheral surface of a cylinder. CONSTITUTION:When a shaft 2 is rotated, the increase and the decrease of the volumes of compression chambers 9a, 9b, and 9c formed with a rotor 1, a cylinder 7, a vane 10, a tip seal 13, and side plates F, R3, and 8 are repeated to provide the function of a compressor. In this case, even when the tip seal 13 is rolled in an inclination state on an inner peripheral surface 7a of the cylinder 7 bent as a result of a bolt being fastened, since chamfering lB (larger than chamfering $1A of the end surface of the tip seal) is formed in two end parts 7b and 7c of the inner periphery of the cylinder, a speed difference between two end surfaces 13a and 13b of the tip seal is difficult to produce. This constitution reduces axial thrust of the tip seal 13 and suppresses wear of a side plate F or R3 due to the tip seal 13.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to improvements in vane type rotary compressors with tip seals used in air conditioners for vehicles and the like.

[Conventional technology]

As described in Japanese Patent Laid-Open No. 61-201896, a conventional rotary compressor has a structure in which no positive chamfering is provided on both ends of the inner circumferential surface of the cylinder.

[Problem to be solved by the invention]

The above conventional technology has the following problems.

- Since the cylinder is tightened by side plates and bolts within the shell, when the tip seal rolls on the inner peripheral surface of the cylinder, the chip seal rolls at an angle along the above-mentioned deflection shape.

At this time, in the prior art, since there is no chamfering (relief) at both ends of the cylinder inner circumferential surface, the portion of the cylinder inner circumferential surface facing the tip seal chamfer remains unworn. Therefore, one end of the tip seal comes into strong contact with the inner circumferential surface of the cylinder, creating a speed difference between both ends of the tip seal.

Therefore, the tip seal has a problem in that a thrust force is generated in the axial direction, and the tip seal comes into strong contact with the side plate, accelerating wear of the side plate.

An object of the present invention is to provide a highly reliable rotary compressor in which side plate wear is suppressed.

[Means to solve the problem]

In order to achieve the above object, the present invention provides a chamfer (relief) larger than the chamfer of the tip seal end face at the end of the inner peripheral surface of the cylinder.

[Effect]

In the present invention, as shown in FIG. 1, the end of the inner circumferential surface of the cylinder is provided with a chamfer (relief) larger than the chamfer of the end face of the tip seal. Since there is no remaining portion of the inner peripheral surface of the cylinder caused by the chamfering of the tip seal end face shown in the technical example, a speed difference is less likely to occur between both ends of the tip seal. Therefore, axial thrust force is less likely to be generated on the tip seal, and the contact between the tip seal and the side blade becomes weaker, so that wear of the side plate can be suppressed.

〔Example〕

An embodiment of the present invention will be described below with reference to FIGS. 1 and 2. In the figure, 1 is a rotor integrally molded with a shaft 2, and has a pair of vane grooves 1a at positions facing each other by 18 degrees on the outer periphery. The shaft 2 is formed only on one end surface 1b of the rotor, and a large space 1d is provided from the other end surface 1c of the rotor to the interior of the rotor. Rotor 1. The shaft 2 is rotatably supported by two bearings 5 and 6 provided on the front cover 4 with the side plate F3 in between. The cylinder 7 and the side plate R8 are stacked on the side plate F3 in the axial direction to form a compression chamber 9 between the side plate F3 and the outer circumference of the rotor.
The three compression chambers 9a, 9b, 9 are created by one vane 1o inserted through the vane groove 1a of the rotor 1.
It is subdivided into c. Large space 1d inside the rotor
A cylindrical sliding surface 10a that is perpendicular to the vane groove 1a of the rotor is formed in the center of the vane 1o located at the vane 1o. The slider 11 is built into the cylindrical sliding surface 10a, and is restrained so that it can reciprocate in the axial direction of the cylinder. A cantilevered slider pin 12 fixed to the side plate R8 is inserted into the hole 11a in the center of the slider 11, and the slider 11 is rotated around the axis of the slider pin 12. are also restrained.

Note that the slider pin 12 is connected to the rotor 1. It is parallel to the rotation axis of the shaft 2 and fixed to the side plate R8 at an eccentric position. A groove 10b having a concave cross section is provided at the tip of the vane 10, and an inner columnar tip seal 13 is installed in the groove to seal a minute space with the inner circumferential surface 7a of the cylinder 7. The inner circumferential surface 7a of the cylinder has a closed curve shape slightly larger than the locus of the tip of the vane, and both ends 7b and 7c of the inner circumferential surface are shaped like an end surface 13a of the tip seal 13 (
The chamfer (dimension Qa) is larger than the dimension 2^).

When the shaft 2 rotates in such a structure,
The rotor 1. Cylinder 7, vane 10° tip seal 13. The volumes of the compression chambers 9a, 91+, and 9c formed by the side plates F-R3 and F-R8 repeatedly increase and decrease, thereby exhibiting the function of the compressor.

According to this embodiment, even if the tip seal 13 rolls in an inclined manner on the inner circumferential surface 7a of the cylinder which is bent due to bolt tightening, the surface end 7b of the inner circumference of the cylinder.

Since there is a chamfer QB (larger than the chamfer Q^ of the tip seal end face) provided at 7c, both end faces 13a of the chip seal as described in the prior art.

There is an effect that a speed difference is less likely to occur between the tip seals 13b, the axial thrust of the tip seal 13 is reduced, and wear of the side plate F or R3 or 8 by the tip seal 13 can be suppressed.

In addition, since the means of the present invention requires only chamfering the inner circumferential surface of the cylinder, it also has the effect that it can be easily achieved at low cost without increasing the number of parts.

〔Effect of the invention〕

According to the present invention, wear of the side plate due to the chip seal can be suppressed, so there is an effect that a reliable rotary compressor can be provided.

[Brief explanation of drawings]

Figure 1 is a main sectional view of one embodiment of the present invention, Figures 2 and 3 are
The figure is a sectional view of a rotary compression chamber showing an embodiment of the present invention. 7...Cylinder, 7a...Inner peripheral surface, 7b, 7c'.
... End face portion, 13... Chip seal, 13a, 13b
...End face, Q^...Chip seal end chamfer dimensions,
QB...Cylinder inner circumferential end chamfer dimensions.

Claims (1)

[Claims] 1. A rotor and a shaft formed coaxially with the rotor;
one or more vanes that slide through the rotor in a pair of vane grooves provided at opposing positions on the outer periphery of the rotor; a cylindrical tip seal incorporated in the groove provided at the tip of the vane; A cylinder that is close to the rotor at one point and has an inner peripheral surface shape that is almost the same as the trajectory drawn by the tip of the vane, and front and rear side plates that close both ends of the cylinder and form a compression chamber. , and a rotary compressor having component parts thereof, characterized in that an end face of the inner circumferential surface of the cylinder is provided with a chamfer larger than the chamfer of the corner parts of both end faces of the tip seal. .