Compressing apparatus with extended variable capacity range and

Details Compressing apparatus with extended variable capacity range and Compressing apparatus with extended variable capacity range and

1990-03-27

1991-05-07

Smith, Leonard E.

Pumps

Condition responsive control of pump drive motor

With condition responsive control of pump fluid valve

417 53, 417 45, F04B 4900

Patent

active

050132172

ABSTRACT:
A rotary compressor includes first and second compressing devices in a casing to successively carry out a parallel operation wherein first and second compressing devices are parallely driven and a single operation wherein one of first and second compressing devices is driven. A relatively high driving frequency is applied to the rotary compressor during single operation as compared to the driving frequency during parallel operation necessary to produce the same compressing capacity to enhance the EER of the rotary compressor and to extend the variable compressing capacity of the rotary compressor.

REFERENCES:
patent: 4137726 (1979-02-01), Watada
patent: 4407139 (1983-10-01), Ide et al.
patent: 4452570 (1984-06-01), Fujisaki et al.
patent: 4780067 (1988-10-01), Suzuki et al.

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