Rotating fluid machine

Abstract

A rotating fluid machine is constructed such that an annular piston (22) is received inside annular cylinder chambers (C1, C2) of a cylinder (21) to form an outer cylinder chamber (C1) and an inner cylinder chamber (C2), that the cylinder (21) and the annular piston (22) relatively perform eccentric rotating motion, and that the rotating fluid machine has an eccentrically rotating piston mechanism (20) in which the cylinder chambers (C1, C2) are partitioned into first chambers (C1-Hp, C2-Hp) and second chambers (C1-Lp, C2-Lp). In order to prevent seizure and wear of the blade (23) and the annular piston (22) during operation and to prevent gas leakage between the first chambers (C1-Hp, C2-Hp) and the second chambers (C1-Lp, C2-Lp), the blade (23) and the annular piston (22) are relatively movably connected by an oscillation bush (27), and sliding surfaces (P1, P2) are provided on the blade (23), at sections at which the blade (23) is in contact with the annular piston (22) and the oscillation bush (27).

Description

technical field [0001] The present invention relates to a rotary fluid machine, and more particularly to a rotary fluid machine having an eccentric rotary piston mechanism in which a cylinder is disposed inside an annular cylinder chamber of a cylinder. The cylinder chamber is divided into an outer cylinder chamber and an annular piston in an inner cylinder chamber, and the cylinder and the annular piston relatively perform an eccentric rotational movement. Background technique [0002] Conventionally, as a rotary fluid machine equipped with an eccentric rotary piston mechanism in which an annular piston eccentrically rotates inside an annular cylinder chamber, there is a method of compressing refrigerant by changing the volume of the cylinder chamber accompanying the eccentric rotary motion of the annular piston. compressor (for example, refer to Patent Document 1). As shown in FIGS. 16 and 17 (cross-sectional view XVII-XVII in FIG. 16 : hatching omitted), in this compress...

AI Technical Summary

Problems solved by technology

[0012] However, in the structures shown in FIGS. 16 and 17, the vanes 123A, 123B are in line contact with the annular piston 122, and in the structure shown in FIG. 18, the vanes 123 are in line contact with the cylinders 124, 125, so when When the ring-shaped piston 122 performs eccentric rotation during operation, the contact portion receives a large load, and the contact portion may be worn or sintered.

[0013] In addition, since the components are in line contact with each other in this way, there is also a disadvantage that the sealing performance of the contact portion is poor.

Therefore, in the above structure, in both the outer cylinder chamber C1 and the inner cylinder chamber C2, the refrigerant leaks from the high-pressure chambers C1-Hp, C2-Hp to the low-pressure chambers C1-Lp, C2-Lp, which may cause compression. Reduced efficiency

[0014] In addition, although the compressor is described as a fluid machine in the above example, when the above fluid machine is an expander or a pump, the contact portion between the blades (123A, 123B) (123) and the annular piston 122 may be worn, It is also possible for gas to leak between the first chamber C1-Hp, C2-Hp and the second chamber C1-Lp, C2-Lp

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