Refrigeration – Automatic control – Refrigeration producer
Patent
1976-10-14
1978-05-02
Wayner, William E.
Refrigeration
Automatic control
Refrigeration producer
62227, 62228, 62510, F25B 4100
Patent
active
RE0296210
ABSTRACT:
A variable capacity multiple compressor refrigeration system having first and second compressors with the first compressor to be always running when the system is operating and the second compressor to be cycled off or to vary the capacity of the system on while the first compressor continues to run. The discharge lines of both compressors are connected together in parallel to the system and a check valve is provided in the discharge line connection between the compressors to prevent discharge pressure from the operating compressor from entering the discharge port of the nonrunning compressor. A by-pass line connects the suction of the system at the inlet of the second compressor to its discharge line between the check valve and its discharge port and a solenoid valve in the by-pass line is arranged to be closed when the second compressor is running and open when it is cycled off.
In one form of the invention, both compressors are multiple cylinder hermetic shell compressors and the inlet of the second compressor is connected to the system through the shell of the first compressor. Also, the first compressor is provided with unloading mechanism to unload some of its cylinders for part unloaded operation, so that four steps of different capacity may be obtained by running the first compressor either loaded or partly unloaded while the second compressor is cycled off or on and therefore, with the aforementioned inlet arrangement, effectively high saturated gas discharge temperatures may be obtained without over heating either compressor for any of the capacity steps of operation.
REFERENCES:
patent: 2253623 (1941-08-01), Jordon
patent: 2865610 (1958-12-01), Sparrow
patent: 3022642 (1962-02-01), Long
patent: 3126713 (1964-03-01), Parker
patent: 3495418 (1970-02-01), Kapich
patent: 3503223 (1970-03-01), Parker
Conley Thomas F.
Gylland, Jr. Ernest F.
Arenz E. C.
Wayner William E.
Westinghouse Electric Corp.
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