Rotary expansible chamber devices – Interengaging rotating members – Non-parallel axis
Patent
1985-06-03
1986-09-09
Smith, Leonard E.
Rotary expansible chamber devices
Interengaging rotating members
Non-parallel axis
418201, 417310, 417440, F04C 1816, F04C 1820
Patent
active
046106138
ABSTRACT:
A rotary screw gas compressor for a refrigeration system comprises a motor-driven single main rotor having helical grooves and mounted for rotation in a rotor bore in the compressor housing and a pair of star-shaped gate rotors rotatably mounted in the housing and engageable with the helical grooves to define a plurality of compression chambers. A suction slide valve member is slidably positionable (between full load and unload positions) to control where low pressure uncompressed refrigerant gas from a suction port is admitted to the compression chambers to thereby function as a suction bypass to control compressor capacity. A discharge slide valve member is slidably positionable (between minimum and adjusted volume ratio positions) to control where high pressure compressed refrigerant gas is expelled from the compression chambers to a discharge port to thereby control the volume ratio and thereby the input power to the compressor. Both slide valve members are disposed in side-by-side sliding relationship in a common recess in the compressor housing which extends alongside and communicates with the rotor bore and each has a face which is complementary to and confronts the main rotor surface in sliding sealed relationship. The slide valve members are independently movable by separate piston-cylinder type hydraulic actuators. A control system responsive to compressor capacity and volume ratio operates the actuators to position the slide valve members to cause the compressor to operate at a predetermined capacity and minimum power input. The control system includes sensing devices to detect the position of the slide valve members.
REFERENCES:
patent: 3151806 (1964-10-01), Whitfield
patent: 3756753 (1973-09-01), Persson
patent: 3936239 (1976-02-01), Shaw
patent: 4261691 (1981-04-01), Zimmern
patent: 4457861 (1984-06-01), Garland
Kirby Thomas F.
Nilles James E.
Obee Jane E.
Smith Leonard E.
Vilter Manufacturing Corporation
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