High displacement rate,scroll-type, fluid handling apparatus

Details High displacement rate,scroll-type, fluid handling apparatus High displacement rate,scroll-type, fluid handling apparatus

1997-02-13

1999-01-05

Vrablik, John J.

Rotary expansible chamber devices

Multistage

418 552, 418 553, 418 60, F04C 1804, F04C 2300, F04C 2502

Patent

active

058554734

ABSTRACT:
A fluid handling apparatus, particularly a vacuum pump, has as a first stage a high volumetric displacement rate scroll pump of multiple nested interacting pairs of fixed and movable spiral-shaped blades supported in a housing between an inlet and an outlet. Each adjacent blade pair closes one inter-blade pocket in each cycle of operation. For very low base pressure vacuum applications, the adjacent blades extend about two revolutions to produce plural pockets in series. A second scroll pump mounted in the housing has its inlet fed directly from the first scroll outlet. The second scroll has a single pair of co-acting fixed and movable blades with multiple revolutions. A central drive shaft rotating in main bearings has an eccentric portion coupled to a plate that carries the movable blades of both scroll pumps. Synchronization cranks constrain the plate to orbit, not rotate. A purge gas flows over the crank bearings to sweep away and/or dilute corrosive fluids. It exhausts within the pump to the inter-stage pressure at the second stage inlet without adversely affecting the pump inlet pressure. Another purge gas flow sweeps corrosive gases from the main bearings, preferably formed as two sets of angular contact ball bearings aligned axially and oriented back-to-back.

REFERENCES:
patent: 3989422 (1976-11-01), Guttinger
patent: 4650405 (1987-03-01), Iwanami et al.
patent: 5258046 (1993-11-01), Haga et al.
patent: 5616015 (1997-04-01), Liepert

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