Rotary compressor

Patent metadata

Field	Value
Publication number	US-11333149-B2
Application number	US-201816635257-A
Country	US
Kind code	B2
Filing date	Jul 25, 2018
Priority date	Aug 24, 2017
Publication date	May 17, 2022
Grant date	May 17, 2022

Abstract

A recessed part is provided in a position, in which an upper vane and a lower vane slide, in an outer peripheral part of an intermediate partition plate in a rotary compressor. Double of eccentric amounts in an upper eccentric part and a lower eccentric part of a rotating shaft is 30% or more of entire lengths in a sliding direction of the upper vane and the lower vane respectively. A width W of the recessed part in a circumferential direction of the intermediate partition plate is larger than a thickness T of each of the upper vane and the lower vane. When a depth of the recessed part is D and an entire length of each of the upper vane and the lower vane is L, D≥0.1×L . . . Expression 1 is satisfied.

First claim

The invention claimed is:

1. A rotary compressor comprising:
a vertically-cylindrical compressor housing in an upper part of which a discharge portion for a refrigerant is provided and in a lower part of which a suction portion for the refrigerant is provided;
a compressing unit that is arranged in the lower part in the compressor housing, that compresses the refrigerant sucked from the suction portion, and that performs a discharge thereof from the discharge portion; and
a motor that is arranged in the upper part in the compressor housing and that drives the compressing unit,
wherein the compressing unit includes an annular upper cylinder and an annular lower cylinder, an upper end plate that blocks an upper side of the upper cylinder, a lower end plate that blocks a lower side of the lower cylinder, an intermediate partition plate that is arranged between the upper cylinder and the lower cylinder and that blocks a lower side of the upper cylinder and an upper side of the lower cylinder, a rotating shaft rotated by the motor, an upper eccentric part and a lower eccentric part that are provided to the rotating shaft with 180° of a phase difference from each other, an upper piston that is fitted into the upper eccentric part, that makes an orbit motion along an inner peripheral surface of the upper cylinder, and that forms an upper cylinder chamber in the upper cylinder, a lower piston that is fitted into the lower eccentric part, that makes an orbit motion along an inner peripheral surface of the lower cylinder, and that forms a lower cylinder chamber in the lower cylinder, an upper vane that separates the upper cylinder chamber into an upper suction chamber and an upper compression chamber by being protruded from an upper vane groove provided in the upper cylinder into the upper cylinder chamber and coming into contact with the upper piston, and a lower vane that separates the lower cylinder chamber into a lower suction chamber and a lower compression chamber by being protruded from a lower vane groove provided in the lower cylinder into the lower cylinder chamber and coming into contact with the lower piston,
a recessed part is provided in a position, in which the upper vane and the lower vane slide, in an outer peripheral part of the intermediate partition plate,
double of eccentric amounts of the upper eccentric part and the lower eccentric part of the rotating shaft is 30% or more of entire lengths in a sliding direction of the upper vane and the lower vane respectively, and
a width W of the recessed part in a circumferential direction of the intermediate partition plate is larger than a thickness T of each of the upper vane and the lower vane, and when a depth of the recessed part is D and the entire length of each of the upper vane and the lower vane is L,
D≥ 0.1× L   Expression 1

is satisfied.

2. The rotary compressor according to claim 1 , wherein at bottom dead centers of the upper piston and the lower piston, 80% or more of the entire lengths in the sliding direction of the upper vane and the lower vane are respectively housed in the upper cylinder and the lower cylinder.

3. The rotary compressor according to claim 1 ,
wherein a coated membrane is provided at a leading end part of the upper vane which part comes into contact with the upper piston,
the coated membrane is provided at a leading end part of the lower vane which part comes into contact with the lower piston, and
the coated membrane includes any one of diamond-like carbon, a chromium nitride, and a titanium nitride.

4. The rotary compressor according to claim 1 ,
wherein the recessed part is formed from one end side to the other end side of the intermediate partition plate in an axial direction of the rotating shaft.

5. The rotary compressor according to claim 4 ,
wherein the recessed part is formed from the one end side to the other end side of the intermediate partition plate with the depth D being even.

6. A rotary compressor comprising:
a vertically-cylindrical compressor housing in an upper part of which a discharge portion for a refrigerant is provided and in a lower part of which a suction portion for the refrigerant is provided;
a compressing unit that is arranged in the lower part in the compressor housing, that compresses the refrigerant sucked from the suction portion, and that performs a discharge thereof from the discharge portion; and
a motor that is arranged in the upper part in the compressor housing and that drives the compressing unit,
wherein the compressing unit includes an annular upper cylinder and an annular lower cylinder, an upper end plate that blocks an upper side of the upper cylinder, a lower end plate that blocks a lower side of the lower cylinder, an intermediate partition plate that is arranged between the upper cylinder and the lower cylinder and that blocks a lower side of the upper cylinder and an upper side of the lower cylinder, a rotating shaft rotated by the motor, an upper eccentric part and a lower eccentric part that are provided to the rotating shaft with 180° of a phase difference from each other, an upper piston that is fitted into the upper eccentric part, that makes an orbit motion along an inner peripheral surface of the upper cylinder, and that forms an upper cylinder chamber in the upper cylinder, a lower piston that is fitted into the lower eccentric part, that makes an orbit motion along an inner peripheral surface of the lower cylinder, and that forms a lower cylinder chamber in the lower cylinder, an upper vane that separates the upper cylinder chamber into an upper suction chamber and an upper compression chamber by being protruded from an upper vane groove provided in the upper cylinder into the upper cylinder chamber and coming into contact with the upper piston, and a lower vane that separates the lower cylinder chamber into a lower suction chamber and a lower compression chamber by being protruded from a lower vane groove provided in the lower cylinder into the lower cylinder chamber and coming into contact with the lower piston,
a recessed part is provided in a position, in which the upper vane and the lower vane slide, in an outer peripheral part of the intermediate partition plate,
double of eccentric amounts of the upper eccentric part and the lower eccentric part of the rotating shaft is 30% or more of entire lengths in a sliding direction of the upper vane and the lower vane respectively, and
a width W of the recessed part in a circumferential direction of the intermediate partition plate is larger than a thickness T of each of the upper vane and the lower vane, and when a depth of the recessed part is D and the entire length of each of the upper vane and the lower vane is L,
D≥ 0.1× L   Expression 1

is satisfied,
wherein in the recessed part, a chamfered face is formed at each of a corner between a face, on which the upper vane slides, in the intermediate partition plate and an inner surface of the recessed part and a corner between a face, on which the lower vane slides, in the intermediate partition plate and the inner surface of the recessed part.

7. A rotary compressor comprising:
a vertically-cylindrical compressor housing in an upper part of which a discharge portion for a refrigerant is provided and in a lower part of which a suction portion for the refrigerant is provided;
a compressing unit that is arranged in the lower part in the compressor housing, that compresses the refrigerant sucked from the suction portion, and that performs a discharge thereof from the discharge portion; and
a motor that is arranged in the upper part in the compressor housing and that drives the compressing unit,
wherein the compressing unit includes an annular upper cylinder and an annular lower cylinder, an upper end pl

Assignees

• Fujitsu General Ltd

Inventors

• Inoue Akira
• Tanaka Junya

Classifications

• F04C18/3564 Primary

  the surfaces of the inner and outer member, forming the working space, being surfaces of revolution · CPC title

• F04C23/001

  of similar working principle · CPC title

• F04C2240/10

  Stators · CPC title

• F04C18/356 Primary

  with vanes reciprocating with respect to the outer member · CPC title

• F04C2240/80

  Other components · CPC title