Rotary compressor

• US 3,900,277 A
• Filed: 02/04/1974
• Issued: 08/19/1975
• Est. Priority Date: 06/12/1972
• Status: Expired due to Term

• Current Assignee: Alwin B. Newton
• Original Assignee: Alwin B. Newton
• Inventors: Newton, Alwin B.
• Primary Examiner(s): Husar, C. J.
• Assistant Examiner(s): Smith, Leonard
• Application Number:
  US05/439,512
• Time in Patent Office: 561 Days
• Field of Search: 418/159,183,184,236
• US Class Current: 418/184
• CPC Class Codes: F04C 29/12 Arrangements for admission or discharge of the working fluid, e.g. constructional features of the inlet or outlet

Abstract

A rotary gas compressor of the sliding vane type having a rotor positioned eccentrically within a working chamber provided by a cylinder in the stator housing which is closed by end plates secured to the housing. The rotor carries blades or vanes slidable within slots formed in the rotor to engage the cylinder and sweep the working chamber to compress gas introduced therein. The end plates are formed with arcuate, gas discharge slots connecting the outlet port of the housing with circumferentiallyspaced discharge slots in the rotor in a manner to provide an alternate, low resistance path for gas flow at a point located a substantial distance from the outlet port. This arrangement is effective to reduce the extremely high pressure which is normally generated in the discharge zone as the vanes approach the main outlet port and valve assembly.

Claims

1. A rotary gas compressor comprising a housing having a substantially cylindrical interior surface and opposed end plates defining a closed chamber;

a rotor having a cylindrical peripheral surface and opposed side faces, said rotor being mounted in said chamber and rotatable about an axis which is offset with respect to the axis of said cylindrical interior surface, said rotor and said housing defining a generally crescent shaped compression cavity;

a gas inlet port and a gas discharge port communicating with said compression cavity;

a valve associated with said gas discharge port;

a plurality of vanes slidably supported in said rotor and engaging said cylindrical interior surface;

means defining an elongated slot in at least one of said end plates having an exit end located in communication with said discharge port and an entrance end located at a point circumferentially spaced in a direction toward said inlet port and inwardly spaced from said cylindrical peripheral surface, the entire slot being substantially covered by one of the side faces of said rotor; and

means defining a passage immediately adjacent each vane in said one rotor end surface extending away from the cylindrical surface and providing a first flow path for gas which intermittently connects that portion of the compression cavity ahead of the vane with the entrance end of said elongated slot, a second flow path, communicating with said discharge port, for gas being provided between the cylindrical surface on said rotor, the cylindrical interior surface of said housing and said end plates within said housing.