Multi-section roots vacuum pump of reverse flow cooling type wit

Details Multi-section roots vacuum pump of reverse flow cooling type wit Multi-section roots vacuum pump of reverse flow cooling type wit

1987-06-23

1988-12-06

Vrablik, John J.

Rotary expansible chamber devices

Multistage

Interengaging rotary members

418 15, 418 83, 417243, F04C 1818, F04C 2300, F04C 2502, F04C 2904

Patent

active

047893141

ABSTRACT:
A multi-section Roots vacuum pump of the reverse flow cooling type with internal flow division arrangement includes a sequence of pump sections, casings for the pump sections including housings for accommodating pairs of rotor therein, inlet passages and outlet passages connected to the casing for pump sections, upper peripheral gas passages connected to the inlet passage formed around an upper portion of the housing, lower peripheral gas passages connected to a supply inlet of reverse flow cooling gas formed around a lower portion of the housing, partition walls between the upper and lower peripheral gas passages, and inter-section walls for separating adjacent pump sections. Communicating passages are formed through the inter-section walls for communicating the lower peripheral gas passages of a pump section with the upper peripheral gas passages of the following pump section, connection pipes are provided between an outlet passage of the casing of a pump section and an inlet passage of the casing of the following pump section, and coolers are provided in the connection pipes.

REFERENCES:
patent: 3535058 (1970-10-01), Devine
patent: 3667874 (1972-06-01), Weatherston et al.

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