28 June 2015 to 2 July 2015
JW Marriott Starr Pass Resort
Etc/GMT-7 timezone

Linear Resonance Compressor for Stirling-Type Cryocoolers Activated by Piezoelectric Stack-Type Elements

30 Jun 2015, 09:00
2h
Exhibit Hall (Arizona Ballroom) ()

Exhibit Hall (Arizona Ballroom)

Poster Presentation CEC-05 - Expanders, Pumps, Compressors, and Regenerators C2PoB - Stirling and Pulse Tube Cryocoolers

Speaker

Mr Sergey Sobol (Technion - Israel Institute of Technology)

Description

A novel type of the PZT based compressor operating at mechanical resonance, suitable for pneumatically-driven Stirling-type cryocoolers was developed theoretically and built practically during this research. A resonance operation at relatively low frequency was achieved by incorporating the piezo ceramics into the moving part, and by reduction of the effective piezo stiffness using hydraulic amplification. The detailed concept, analytical model and the test results on the preliminary prototype were reported earlier and presented at ICC17. A fine agreement between the simulations and experiments spurred development of the actual compressor intending to drive a miniature Pulse Tube cryocooler, particularly our MTSa model, which operates at 103 Hz and requires an average PV power of 11 W, filling pressure of 40 Bar and a pressure ratio of 1.3. The paper concentrates on design aspects and optimization of the governing parameters. The large diameter to stroke ratio (about 10:1) allows for the use of a composite diaphragm instead of a clearance-seal piston. The motivation is to create an adequate separation between the coolant and the buffer gas of the compressor, thus preventing possible contamination in the cryocooler. Providing a similar to conventional linear compressors efficiency and power density, the piezo compressor may serve as a good alternative for cryogenic applications requiring extreme reliability and absence of magnetic field interference.

Primary author

Mr Sergey Sobol (Technion - Israel Institute of Technology)

Co-author

Prof. Gershon Grossman (Technion - Israel Institute of Technology)

Presentation Materials