Scroll compressor with control device for variable displacement

Details Scroll compressor with control device for variable displacement Scroll compressor with control device for variable displacement

1986-08-11

1988-01-05

Freeh, William L.

Pumps

With condition responsive pumped fluid control

Pressure responsive relief or bypass valve

621963, E04B 4900

Patent

active

047173149

ABSTRACT:
A scroll type compressor with a variable displacement mechanism is disclosed. The compressor includes a housing having fluid inlet and outlet ports. A fixed scroll is fixed within the housing and has a circular end plate from which a first spiral element extends. The end plate of fixed scroll partitions the inner chamber of housing into a front chamber, which includes a suction chamber connected to the fluid inlet port, and a rear chamber. The rear chamber is divided into a discharge chamber connected to the fluid outlet port and an intermediate pressure chamber. The end plate of the fixed scroll has at least two holes which connect the fluid pockets to the intermediate pressure chamber. A control device controls communication between the suction chamber and the intermediate pressure chamber and includes communicating mechanism. The communicating mechanism leaks compressed fluid in the cylinder at an increased rate into the suction chamber after the cylinder has moved upward a predetermined distance in order to effect stable operation of the displacement varying mechanism.

REFERENCES:
patent: 4468178 (1984-08-01), Hiraga et al.
patent: 4496296 (1985-01-01), Arai et al.
patent: 4497615 (1985-02-01), Griffith
patent: 4505651 (1985-03-01), Terauchi et al.
patent: 4514150 (1985-04-01), Hiraga et al.

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