Refrigeration – Automatic control – Diverse – cascade or compound refrigeration-producing system
Patent
1991-08-19
1993-05-18
Vrablik, John J.
Refrigeration
Automatic control
Diverse, cascade or compound refrigeration-producing system
417 53, 417288, 418 1, 4182012, F04B 492, F04C 1816, F04C 2908, F25B 700
Patent
active
052110265
ABSTRACT:
An unloading arrangement for a rotary screw compressor includes discrete and different unloading apparatus associated with the male and female rotors respectively. The unloading apparatus associated with the male rotor is an axial piston continuous unloader movably disposed in a bore which is remote from but in flow communication, through a series of ports, with the compressor's working chamber. The unloading apparatus associated with the female rotor is a step unloader which, when opened, unloads the compressor in a single, relatively large capacity step. The compressor is therefore capable of being unloaded both over a continuous operating range and in a discontinuous, stepwise fashion. By duplexing compressors of this type, continuous capacity modulation of a multiple compressor system is made available over a large operating range without the employment of compressors unloaded by slide valve mechanisms.
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American Standard Inc.
Beres William J.
Ferguson Peter D.
O'Driscoll William
Vrablik John J.
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