Dual seal pump

Details Dual seal pump Dual seal pump

1991-12-27

1992-12-29

Kamen, Noah P.

Internal-combustion engines

Cooling

With liquid coolant circulating means

277 3, 277 27, 277 59, 415229, F01P 510

Patent

active

051742500

ABSTRACT:
Pressurizing an intermediate fluid chamber of a pump housing is useful to substantially eliminate fluid loss across the seal faces in the pump housing. The subject dual seal pump has a spring-loaded diaphragm in an intermediate fluid chamber of the pump housing separating the intermediate fluid chamber into primary and secondary compartments. A fluid chamber in the pump housing is in fluid communication with the primary compartment of the intermediate fluid chamber. A fluid connecting means, including a conduit, an annulus, a pair of passages, and a recess communicate fluid into the primary compartment of the intermediate fluid chamber. The secondary compartment of the intermediate fluid chamber contains a non-corrosive fluid which is pressurized accordingly by the spring-loaded diaphragm. The result is a higher pressure in the second compartment of the intermediate fluid chamber which substantially eliminates fluid loss across the seal. A small pressure difference between the intermediate fluid chamber and an atmospheric pressure chamber may allow a minute amount of fluid leakage across the seal. However, the buffer fluid contained in the intermediate fluid chamber has no corrosion inhibitors to score the seal face, thus, a longer seal life is obtained.

REFERENCES:
patent: 3474734 (1969-10-01), Stogner
patent: 3943717 (1976-03-01), Schexnayder
patent: 4290611 (1981-09-01), Sedy
patent: 4537385 (1985-08-01), Bragg et al.
patent: 4632402 (1986-12-01), Daeyaert

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