Two stage gas compressor

• US 5,322,424 A
• Filed: 07/09/1993
• Issued: 06/21/1994
• Est. Priority Date: 11/12/1991
• Status: Expired due to Fees

• Current Assignee: Matsushita Electric Industrial Company Limited (Panasonic Holdings Corporation)
• Original Assignee: Matsushita Electric Industrial Company Limited (Panasonic Holdings Corporation)
• Inventors: Fujio, Katuhara
• Primary Examiner(s): Bertsch, Richard A.
• Assistant Examiner(s): FREAY, CHARLES GRANT
• Application Number:
  US08/087,765
• Time in Patent Office: 347 Days
• Field of Search: 418/11, 418/60, 418/63, 418/212, 418/248
• US Class Current: 418/11
• CPC Class Codes: F04C 18/3564 the surfaces of the inner and outer member, forming the working space, being surfaces of revolution
• CPC Class Codes: F04C 23/001 of similar working principle
• CPC Class Codes: F04C 23/008 Hermetic pumps

Abstract

A motor and a low and a high pressure stage compression element which are driven by the motor are disposed in a closed container so as to constitute a rolling piston type rotary compression mechanism in which the discharge side of the low pressure stage compression element is communicated with the suction side of the high pressure stage compression element by way of a communication passage, and coolant compressed by said high pressure stage compression element is discharged into the closed container so as to define a discharge gas passage for cooling the motor, and the cylinder volume of the high pressure stage compression element is set to 45 to 65% of that of said low pressure stage compression element while the compression timing of the high pressure stage compression element is delayed by an angle of 60 to 80 deg. from the compression timing of the low pressure stage compression element so as to optimize the compression timings of the high and low pressure stage compression elements in order to reduce excessive compression and insufficient compression, thereby it is possible to aim at enhancing the compression efficiency.

Claims

1. A rolling piston type rotary two stage coolant compressor comprising:

a closed container; and

a two stage compression mechanism disposed in said closed container and composed of a motor, a high and a high pressure stage compressor element which are driven by said motor, said high pressure stage compression element having a discharge side and said high pressure stage compression element having a suction side and said discharge side is communicated with said suction side in series by way of a communication passage while coolant compressed by said high pressure stage compression element is discharged into said closed container so as to define a discharge gas passage for cooling said motor, further said high pressure stage compression element having a cylinder volume which is set to 45 to 65% of that of said low pressure stage compression element while said high pressure stage compression element has a compression timing which is delayed by an angle of 60 to 80 deg. from that of said low pressure stage compression element.