Linear compressor including reciprocating piston and machined do

Details Linear compressor including reciprocating piston and machined do Linear compressor including reciprocating piston and machined do

1995-01-26

1999-08-31

Graham, Matthew C.

Spring devices

Coil

Irregular

F16F 102, F16F 104

Patent

active

059443022

ABSTRACT:
A linear compressor (60) includes a reciprocating piston (20) for varying the volume of a compression chamber (12). A moving coil motor (26) causes the piston (20) to reciprocate against the force of an integrally machined double-helix spring (62) about a position in which the spring (62) is in a free state. The spring (62) includes a retainer (72) which is attached to the piston (20), a fixed flange (66) and two resilient helical members (78,80) which extend between the flange (66) and retainer (72) along a longitudinal axis (82). The helical members (78,80) are configured such that lateral reaction forces thereof are mutually canceling. The helical members (78,80) have the same twist direction, are interspersed with each other along the longitudinal axis (82) and are rotationally displaced from each other about the longitudinal axis (82) by substantially 180.degree.. Alternatively, a spring (90) includes helical members (100,102) which have opposite twist directions and are spaced from each other along a longitudinal axis (104), and are interconnected at their inner ends by a center member (106).

REFERENCES:
patent: 2049936 (1936-08-01), Zimmer
patent: 2447319 (1948-08-01), Fourchambault
patent: 2875779 (1959-03-01), Campbell
patent: 3588291 (1971-06-01), Curwen et al.
S. Horn et al., Advances in Cryogenic Engineering, vol. 19, paper F-3, Pneumatically Driven Split-Cycle Cryogenic Refrigerator, pp. 216-220, 1974 .

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