Abstract Low vibration Stirling cryocoolers often rely on dual-piston linear compressors, the known disadvantages of which, as compared to their single-piston rivals, are: low reliability, increased power consumption, price, bulk, sensitivity to external vibration and g-forces. However, because of the inherently low level of vibration export, as required in numerous vibration sensitive electronic and electro-optic applications, the dual-piston approach has become prevalent in today’s industrial practice. The authors report on the novel patent pending approach to the passive control of a fundamental component of a vibration export from a single-piston compressor down to the levels typical for the actively controlled dual-piston rival. The technique relies on the principle of dynamic counterbalancing, where an auxiliary movable mass is, on the one hand, flexibly attached to a movable piston assembly and, on another hand, to the stationary compressor casing using auxiliary mechanical springs. The proper design of such a “spring-mass-spring” counterbalancer yields zero vibration export at minimum electrical power and current consumed by the motor. Based on the theoretical analysis, the design of the single-piston compressor of 1 W at 77 K Ricor model K529N Stirling cryocooler was enhanced by adding such a counterbalancer. The obtained experimental results are in full agreement with the theoretical prediction. From experiment, the vibration export at driving frequency was reduced 57-fold at practically the same electrical current and power consumption as compared with the basic cooler.
Dynamically Counterbalanced Single-Piston Linear Compressor of a Cryogenic Cooler
Cryocoolers 13 ; 241-250
2005-01-01
10 pages
Aufsatz/Kapitel (Buch)
Elektronische Ressource
Englisch
Vibration Isolation , Driving Frequency , Cryogenic Cooler , External Vibration , Linear Compressor Physics , Extraterrestrial Physics, Space Sciences , Strongly Correlated Systems, Superconductivity , Optics, Optoelectronics, Plasmonics and Optical Devices , Imaging / Radiology , Automotive Engineering
Dynamically Counterbalanced Single-Piston Linear Compressor of a Cryogenic Cryocooler
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