Two stage gas compressor

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.

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