# US 4,397,620 A · Rotary bladed compressor with sealing gaps at the rotary ends

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- Number: US 4,397,620 A
- Document ID: US4397620A
- Status: Granted
- Kind: A
- Application number: 06/256,250
- Filed: 1981-04-21
- Granted: 1983-08-09
- Earliest claimed: 1981-04-21
- Assignees: Nippon Soken, Inc.
- Inventors: Mitsuo Inagaki; Hideaki Sasaya
- Web page: https://patentgrep.com/patent/US4397620A

## CPC

- F04C 18/3442: {the surfaces of the inner and outer member, forming the inlet and outlet opening}
- F01C 21/08: Rotary pistons (reciprocating pistons in general F16J)
- F04C 27/005: {Axial sealings for working fluid}
- F04C: ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS (engines F03C); ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
- F01C: ROTARY-PISTON OR OSCILLATING-PISTON MACHINES OR ENGINES (internal-combustion aspects F02B53/00, F02B55/00)

## Abstract

A rotary compressor including two rotary disc-shaped members having a diameter slightly smaller than that of a rotor each disposed on opposite ends of the rotor and supported on the same rotary shaft as the rotor for rotation, and two disc-shaped recesses each formed on one of inner opposite end surfaces of a housing for receiving therein one of the plurality of rotary disc-shaped members. A small gap is formed between the inner end surfaces of the housing and the end surfaces of the rotor, and small gaps are formed between surfaces of the rotary disc-shaped members and surfaces of the disc-shaped recesses. The area through which a fluid leaks from the high pressure side to the low pressure side in the housing is minimized, and resistance is offered by the tortuous path to the flow of the fluid toward the rotary shaft, to thereby minimize the leakage of fluid during operation of the compressor.

## Claims

### Claim 1

A rotary blade compressor with sealing gaps at the rotor ends comprising:
a cylindrical housing having an inner peripheral surface and inner end surfaces;
a cylindrical rotor eccentrically supported in said cylindrical housing, said cylindrical rotor being formed with a plurality of grooves; and
a plurality of movable blades each slidably fitted in one of said plurality of grooves in said cylindrical rotor and contacting said inner peripheral surfaces of said cylindrical housing to define a plurality of spaces for compressing a fluid; the improvement comprising:
two rotary disc-shaped members located on one of opposite end surfaces of said cylindrical rotor, said rotary disc-shaped members being of a diameter slightly smaller than that of said cylindrical rotor;
two disc-shaped recesses each formed on one of said inner end surfaces of said cylindrical housing for receiving one of said plurality of rotary disc-shaped members;
first gaps respectively defined between annular walls of said recesses and cylindrical outer surfaces of said rotary disc-shaped members;
second gaps respectively defined between outer end surfaces of said cylindrical rotor and the inner end surfaces of said cylindrical housing; and
third gaps respectively defined between outer end surfaces of said disc-shaped members and the inner end surfaces of said recesses, said first gaps being smaller than said second and third gaps.

### Claim 2 (depends on 1)

A rotary compressor as claimed in claim 1, wherein said first gaps are in a range of from 0.02 mm to 0.03 mm and said second and third gaps are in a range of from 0.04 mm to 0.05 mm.