| 摘要 |
A two-stage gas compressor in which a double acting piston reciprocates in a cylinder in a housing and on a stationary member in which unnecessary compression of gas in the piston interior is avoided and in which gas bypassing the piston rings is prevented from leaking out of the compressor. The piston includes a set of piston rings at each end and between the piston and the stationary member and is actuated by a piston rod sealingly extending through the housing. An opening is provided through the wall of the piston between the two sets of piston rings and a passageway in the housing extends between the compressor first-stage inlet and the piston opening whereby any gas bypassing any of the piston rings and accumulating in the piston cavity will pass to the low pressure first-stage inlet and away from the piston rod packing. The piston includes an external reduced portion between the two sets of piston rings which is in communication with the piston opening and is of a sufficient length to remain in communication with the housing passageway during the entire stroke of the piston.
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