Rotary compressor with two or more suction parts

• US 4,544,337 A
• Filed: 07/11/1983
• Issued: 10/01/1985
• Est. Priority Date: 11/11/1981
• Status: Expired due to Term

• Current Assignee: Matsushita Electric Industrial Company Limited (Panasonic Holdings Corporation)
• Original Assignee: Matsushita Electric Industrial Company Limited (Panasonic Holdings Corporation)
• Inventors: Maruyama, Teruo
• Primary Examiner(s): Vrablik, John J.
• Application Number:
  US06/522,366
• Time in Patent Office: 813 Days
• Field of Search: 418/15, 418/150, 418/259
• US Class Current: 418/15
• CPC Class Codes: F04C 28/18 characterised by varying the volume of the working chamber by changing the positions of inlet or outlet openings F04C28/10

Abstract

A compressor of the present invention performs restraining action in refrigerative ability at high speed driving time utilizing suction loss that vane chamber pressure drops lower than supply source pressure of refrigerant, and comprises a rotor (14) having vanes provided slidably, a cylinder (11) receiving said rotor (14) and vanes (12), side plates fixed to both side faces of said cylinder (11) and closing tightly a space of vane chamber (18a), (18b) formed by said vanes (12), rotor (14) and cylinder (11) at its side faces, and at least more than two suction ports (15) and (17), whereby even in a compressor having many numbers of vane (12), such a compressor with ability control that having no loss in refrigerative ability at low speed, and refrigerative ability is restrained only at high speed driving can be realized.

Claims

1. A vane type rotary compressor comprising:

a cylinder casing constituted by a cylinder having a hollow interior and side plates closing the ends of said cylinder to define a rotor chamber in said hollow interior;

a rotor rotatably mounted in said rotor chamber eccentrically of the axis thereof;

a plurality of vanes slidably mounted on said rotor for sliding outwardly of said rotor into sliding engagement with the interior of said hollow interior during rotation of said rotor and defining vane chambers between said vanes, said rotor and said cylinder which increase and then decrease in size during rotation of said rotor;

said casing having at least two suction ports therein opening into said vane chambers, said ports being spaced around said hollow interior in the direction of rotation of said rotor substantially equally to the circumferential spacing of said adjacent vanes;

said compressor having the parameter K2 with the value 0.025<

K2<

0.080, wherein;

K2=aθ

_s /V_o

a=effective flow area of the suction port toward the compression direction

θ

_s =the angle through which the end of a vane has rotated from the top of said casing to the end of a suction stroke

V_o =maximum volume of a vane chamber.

2. A compressor as claimed in claim 1 in which there are four vanes and two suction ports.

3. A compressor as claimed in claim 1 in which said casing has a circular cross-sectional shape.

4. A compressor as claimed in claim 1 in which said casing has an oval cross-sectional shape constituted by two circular portions the centers of which are spaced from each other.

5. A compressor as claimed in claim 1 in which the first of said suction ports has a groove in the inner surface of said cylinder extending in the direction of rotation and said rotor, and the downstream end of said groove is spaced from the second port a distance equal to the circumferential spacing of the adjacent vanes.