Discharge flow blocking valve for a hermetic rotary compressor

Details Discharge flow blocking valve for a hermetic rotary compressor Discharge flow blocking valve for a hermetic rotary compressor

1989-09-01

1991-11-26

Michalsky, Gerald A.

Pumps

With muffler acting on pump fluid

417279, 417902, F04B 3900

Patent

active

050678787

ABSTRACT:
A discharge flow blocking valve for a compressor having a sealed housing having a cylinder and a piston for compressing refrigerant gas. A discharge muffler is within the housing and has an inlet opening communicating with the cylinder discharge volume, a first outlet opening communicating with the interior of the sealed housing, and a second outlet opening. The blocking valve has an outer casing with a first driving opening in communication with said second outlet of said discharge muffler, and a second driving opening in communication with the housing interior, an inlet in communication with the interior of the housing and an outlet in communication with a discharge mean extending through the housing. A piston movable within the valve casing has surfaces communicating with and responsive to the gas pressure at said first and second driving inlets and is responsive to a pressure differential between the gases at said first and second driving inlets when the compressor starts and the pressure of the second outlet of the muffler is greater than that in the housing interior for moving the piston to provide fluid communication between the valve casing inlet and outlet openings so that the refrigerant gas can leave the compressor, the valve piston being moved to a position to close the valve when the compressor stops and the pressure in the discharge muffler drops.

REFERENCES:
patent: 4573879 (1986-03-01), Uetuji et al.
patent: 4830582 (1989-05-01), Asami et al.

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