Bellows seal

Details Bellows seal Bellows seal

1982-08-13

1985-12-03

Smith, Leonard E.

Pumps

Expansible chamber type

74 182, 277 3, 277 28, 417375, F04B 3904

Patent

active

045563691

ABSTRACT:
A bellows seal apparatus for use in compressors or the like which has pump means arranged and controlled to maintain a desired pressure differential between the inside and outside surfaces of the bellows. It also has a driving mechanism having a connection with a movable end of the bellows and an additional connection or connections with said bellows at unequally spaced points intermediate to the ends of the bellows to provide the least maximum stress levels in the bellows convolutions of each and thus the maximum life expectancy for the seal. The driving mechanism may take many forms but is so designed that it will elongate and contract each section of the bellows a distance depending upon the dynamically caused stresses in each section and the composition of and the number of bellows convolutions in each section.

REFERENCES:
patent: 3568436 (1971-03-01), Heffner et al.
patent: 3875806 (1975-04-01), Brewster
patent: 4424008 (1984-01-01), Braun

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