Magnetohydrodynamically-driven compressor

Details Magnetohydrodynamically-driven compressor Magnetohydrodynamically-driven compressor

1999-05-10

2001-02-06

Freay, Charles G. (Department: 3746)

Pumps

Electrical or getter type

Electromagnetic

C417S092000, C417S103000

Reexamination Certificate

active

06183206

ABSTRACT:

BACKGROUND OF THE INVENTION
There is a need for a noni-contaminiating, high pressure ratio compressor for use in miniature J-T crycoolers, which potentially offer excellent devices for sensor cooling applications in space. A weak link in present J-T coolers is the compressor, which should produce high pressure ratios of 10-30, and operate reliably over extended periods. Also, the working compressor fluid must remain ultra-clean, while commercially available high pressure ratio compressors are typically oil flooded, and require extensive cleanup of the gas stream. Although sorption compressors may provide a source of clean high pressure gas for space J-T coolers, they have relatively low efficiencies and high mass. Additionally, in sensor cooling applications, the mass flow working fluid rates could be very small, thus calling for miniaturization of the compressor components,
BRIEF SUMMARY OF THE PREFERRED EMBODIMENT OF THE INVENTION
Accordingly, the invention provides a mag,nletohydrodyniamiiic compressor which can achieve high pressure ratios in a compact package without contaminating the working fluid, which can be helium gas. Compression is provided by applying a magnetic field to a liquid slug of liquid gallium and passing an alternating current through the liquid slug transverse to the magnetic field to produce back and forth motion of the liquid slug so that it operates as a piston between high and low pressure working fluid portions of the chamber containing the liquid slug. Diaphrams can be beneficially provided to separate the liquid slug from the working fluid.


REFERENCES:
patent: 2756678 (1956-07-01), Collins
patent: 3115837 (1963-12-01), Campana
patent: 4749890 (1988-06-01), Houston
patent: 4824329 (1989-04-01), Yamamoto et al.

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