Pumps – Motor driven – Internal-combustion engine
Patent
1982-06-28
1984-01-03
Smith, Leonard E.
Pumps
Motor driven
Internal-combustion engine
74 182, 92 41, 417375, F04B 3904
Patent
active
044240082
ABSTRACT:
A hermetic seal, primarily for compressors for use in refrigeration or air conditioning systems but having use in apparatus wherein a seal is required between two elements reciprocating substantial distances relative to each other, comprising a bellows having a plurality of sections of convolutions with positive displacement means associated therewith that assures simultaneous movement of most of the convolutions upon rapid acceleration of relative movement between the two elements. This prevents excess stress and strain on any one or more convolutions, or on the end convolutions in particular, that could cause failure thereof by distributing the stress over a large number of the convolutions rather than just a few at any one instant. The stress in each convolution of the bellows depends upon the natural frequency and spring rates of any given bellows diameter and number of convolutions. Also, the stresses in the various convolutions depends upon the location of and the number of sections that have positive displacement means for actuation thereof, (engine) speed and piston acceleration. By proper selection of the number of convolutions in each section, which should decrease in numbers sequentially from a fixed end thereof to a movable end thereof, it is possible to make a bellows of substantial length wherein the maximum stress level in each bellows section will be substantially equal.
REFERENCES:
patent: 1740924 (1929-12-01), Kellogg
patent: 2839241 (1958-06-01), Kurtz
patent: 3216651 (1965-11-01), King et al.
patent: 3745868 (1973-07-01), Prentice
patent: 3875806 (1975-04-01), Brewster
Smith Leonard E.
Staubly Alan M.
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