Rotary expansible chamber devices – Working member has planetary or planetating movement – Helical working member – e.g. – scroll
Patent
1989-02-06
1991-03-05
Vrablik, John J.
Rotary expansible chamber devices
Working member has planetary or planetating movement
Helical working member, e.g., scroll
418 88, 418 94, F04C 1804, F04C 2902
Patent
active
049973509
ABSTRACT:
A compressor unit composed of a fixed scroll and an orbiting scroll which are engaged with each other, and a variable speed motor are disposed in a hermetic chamber. A first bearing is provided in an engagement portion between a crankshaft and the orbiting scroll in an intermediate pressure chamber provided on a back surface of the orbiting scroll for applying thereto an intermediate pressure between a discharge pressure and a suction pressure. The crankshaft is supported by a second bearing provided close to the orbiting scroll and a third bearing provided close to the motor. The first, second and third bearings are lubricated by force of a differential pressure between the discharge pressure and the intermediate pressure through an oil passage. The oil passage is in communication at one end thereof with the lubricant oil on which the discharge pressure is applied, and opens at the other end thereof into the intermediate pressure chamber. Thus, a wear and a sticking of the bearings are prevented even in a low speed region and a high speed region where it is impossible to supply oil with a conventional centrifugal pump.
REFERENCES:
patent: 4462772 (1984-07-01), Hazaki et al.
patent: 4551082 (1985-11-01), Hazaki et al.
patent: 4749344 (1988-06-01), Tomita et al.
Sakurai Kazuo
Tamura Takahiro
Hitachi , Ltd.
Vrablik John J.
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