JPS61223293A - Pressure relieving device for rotary compressor - Google Patents

Abstract

PURPOSE:To vent safely overcompressed fluid in abnormal high pressure to prevent an eccentric member from breakage by forming an auxiliary eccentric portion of a rotary shaft while mounting another eccentric member on the auxiliary eccentric portion through an elastic body. CONSTITUTION:A rotary shaft 14 of a rotary compressor is provided with an auxiliary eccentric portion 22 on which is mounted another eccentric member 15. The eccentric side portions of abutting surfaces of the auxiliary eccentric member 22 and eccentric member 15 are formed with nottches 25, 26 respectively into which is inserted a U-sectioned leaf spring 24. Thus, when abnormal high pressure is generated in a cylinder, the eccentric member 15 is pivoted against the leaf spring 24 to expand a clearance between a roller 16 and the inside wall of the cylinder so that the abnormal high pressure is relieved safely into the low pressure side cylinder.

Description

[Detailed description of the invention] (b) Industrial application fields This invention relates to improvements in pressure relief devices for rotary compressors.

(b) Prior Art A conventional rotary compressor is constructed as shown in, for example, Japanese Utility Model Application No. 47-261'14.

Here, a conventional example will be explained with reference to this publication. In FIG. 4, (1) is a rotary compression element housed in a closed container (not shown), and this compression element is comprised of cylinders 1 (2),
A roller (5) rotates the cylinder (2) C by the eccentric part (4) of the rotating shaft (3), and this roller presses the cylinder (2) into the own ship's high pressure chamber (61 and low pressure chamber (7)). It consists of a partitioning □ page (13) and a k-base.
) is fitted onto the rotating shaft (3) via an eccentricity adjustment ring (9;).

1. In this rotary compressor, the eccentricity of the roller (51) can be changed by changing the eccentricity (51) of the cylinder ( 2) but the rotation axis (3
) and partial liI? Part <4) i'' is shared.' □(c) Problems to be solved by the invention □However, the eccentric part (4) After fitting the rotating shaft (3) through the shaft and setting the amount of eccentricity, there is a warning to prevent the eccentric portion (4) from coming loose. 5) and the roller (8), abnormally high pressure will occur.

There was a problem in that the rotating shaft (3) was bent and the inner periphery of the roller (5) was not worn out.

In order to solve the above problem, this invention aims to transfer this abnormal high pressure to the low pressure side when abnormal high pressure is generated due to liquid compression, etc.
The purpose of this is to suppress the rise in high pressure by releasing the air into the air.

B) Means for Solving the Problems This invention forms a rotating shaft and an eccentric part separately, provides an auxiliary eccentric part on the rotating shaft to which the eccentric part is fitted, and connects the auxiliary eccentric part and the eccentric part. It is fixed with an elastic body.

(e) Effect This invention provides an auxiliary eccentric part on the rotating shaft to which the eccentric part is fitted, and by fixing the auxiliary eccentric part and the eccentric part with an elastic body, abnormal high pressure due to liquid compression etc. is applied to the eccentric part. When the cylinder is hit, this eccentric part is displaced in the circumferential direction away from the bullet/column to shorten the maximum eccentricity and widen the gap formed between the roller and the inner wall of the cylinder, allowing the high-pressure gas to This is to ensure that K leaks to the low pressure side.

-Example The present invention will be explained based on the example shown in FIGS. 1 to 3.

αG is a sealed container, and inside this container there is an electric element αD on the top.
A rotary compression element (121) is housed in the lower part of the rotary compression element (S).
61, and a high pressure chamber αD in the cylinder 0 in contact with this roller.
vane Q9 partitioned into low pressure chamber aa and cylinder α3.
It is composed of an upper bearing part (211) and a lower bearing part (211) that close the opening of the shaft.
is provided. The outer circumference of this auxiliary eccentric part has a through hole (
The eccentric part α9, which is made eccentric from c), is fitted with a clearance. (
2) is a leaf spring with a U-shaped cross section, and this leaf spring is fitted into the recess of the auxiliary eccentric part and the recess part ■ of the eccentric part a9, and the auxiliary eccentric part and the eccentric part are fixed by elastic force. ing. (2
) is a discharge boat communicating with the high pressure chamber aη, and this discharge boat is opened and closed by a discharge valve @. The problem is the suction boat that communicates with low pressure chamber a8.

In the pressure relief device for the rotary compressor configured as described above, the refrigerant flowing from the suction boat device into the low pressure IJiu8 of the cylinder α3 is compressed by the cooperation of the roller (161) and the vane (11), and is discharged from the high pressure chamber αD to the discharge boat. During normal compression, a leaf spring K prevents the eccentric portion α9 from shifting from the auxiliary eccentric portion.

During liquid compression, the pressure in the high pressure chamber aη immediately before the discharge stroke increases rapidly, and the contact pressure between the roller Miro and the eccentric part (151) increases.And when a higher pressure than normal pressure is applied to this roller, , let it rotate by following the rotational direction of the rotation axis α40.The eccentric portion (151) is displaced in the circumferential direction by the displacement of this leaf spring against the elastic force of the leaf spring (goods) 5. Therefore, , the maximum eccentricity between the eccentric part a9 and the auxiliary eccentric part becomes shorter, and the high pressure chamber (1
The roller between 71 and the low pressure chamber (+61 and cylinder 0
The gap with the inner wall widens, and the high-pressure refrigerant passes through this gap into the low-pressure chamber (181KIJ-), preventing the high-pressure chamber (171 from increasing in abnormal pressure). When it is lowered, it returns to its original position by restoring the leaf spring c!4, narrowing the gap between the inner wall of the cylinder 3 and the roller 061, so that normal compression can be performed.

(G) Effects of the Invention The pressure relief device for a rotary compressor of the present invention has a rotating shaft and an eccentric part formed separately, an auxiliary eccentric part provided on the rotary shaft to which the eccentric part is fitted, and a auxiliary eccentric part Since the and eccentric part are fixed with an elastic body, the gap between the inner wall of the cylinder and the roller is expanded at the eccentric part, which is displaced in the circumferential direction against the elastic force of the elastic body due to abnormally high pressure during liquid compression. The high-pressure refrigerant is released to the low-pressure side so that the pressure does not increase by 5KL, and it also prevents wear due to deflection of the rotating shaft.

[Brief explanation of drawings]

1 to 3 show the present invention, FIG. 1 is a longitudinal cross-sectional view of a rotary compressor, FIG. 2 is a cross-sectional view of main parts of a cylinder in a normal compression state, and FIG. 3 is a cylinder in an abnormally high-pressure compression state. FIG. 4 is a sectional view of a main part of a cylinder showing a conventional example. Q31... Cylinder, (141... Rotating shaft, (
15+...Eccentric part. Q61...roller, α9...vane, ■...
Auxiliary eccentric part, c! 4... Leaf spring.

Claims (1)

[Claims] 1. In a rotary compressor that includes a cylinder, a roller that rotates in the cylinder by an eccentric part of the rotating shaft, and a vane that slides in contact with this roller, the rotating shaft and the eccentric part are formed separately, and the eccentric part 1. A pressure relief device for a rotary compressor, characterized in that an auxiliary eccentric part is provided on a rotating shaft to which the auxiliary eccentric part is fitted, and the auxiliary eccentric part and the eccentric part are fixed with an elastic body.