Multi-stage gas compressor incorporating bypass valve device

Details Multi-stage gas compressor incorporating bypass valve device Multi-stage gas compressor incorporating bypass valve device

F - Mech Eng,Light,Heat,Weapons

04

C

F04C 23/00 (2006.01)

Patent

CA 2099989

A multi-stage gas compressor includes a plurality of compression elements which constitute a multi-stage compression mechanism, in which discharge sides of pressure stage compression elements are successively communicated with suction sides of following stage compression elements through respective communication passages so that a discharge side of each lower pressure stage compression element is communicated with a suction side of each higher pressure stage compression element through a communication passage so as to constitute a two-stage compression mechanism. A motor coupled to a drive shaft of the multi-stage compression mechanism is located in a motor chamber within a closed container containing the multi-stage compression mechanism, so as to discharge compressed gas from a final stage compression element of the multi-stage compression mechanism into the motor chamber. An oil sump is provided in a bottom part of the closed container, and a bypass passage connects an intermediate part of one of the communication passages with the motor chamber. A bypass valve device located in the bypass passage allows communication only from the one of the communication passages to the motor chamber, when the pressure of the one of the communication passages is higher than that of the motor chamber. The starting load of the compressor and vibration and noise are reduced.

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