Controlled and variable gas phase shifting cryocooler

a cryocooler and variable technology, applied in the field of refrigeration systems, can solve the problems of limiting heat exchange control, cumbersome long tube geometry, heavy weight, bulky, etc., and the inertance tube does not readily provide the means for optimizing

Inactive Publication Date: 2009-04-02
THE AEROSPACE CORPORATION
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

With a sharp edged orifice, the only variable parameter is the diameter of the orifice, limiting heat exchange control.
Unfortunately, the long tube geometry is also cumbersome, heavy, and bulky.
The long inertance tube does not readily provide the means for optimizing the gas phase shift between the compressor and reservoir for various applications, which requires different cooling capacity.
Additionally, inertance can be increased by increasing the length of tube, but this disadvantageously results in a long and slender tube.
The pulse tube system disadvantageously includes an elongated inertance tube having a length that is longer than a meter in most applications.
The packaging of a long t

Method used

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  • Controlled and variable gas phase shifting cryocooler
  • Controlled and variable gas phase shifting cryocooler
  • Controlled and variable gas phase shifting cryocooler

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Embodiment Construction

[0023]An embodiment of the invention is described with reference to the figures using reference designations as shown in the figures. Referring to FIG. 1, a two-stage gas phase shifting valve cryocooler is a modified version of a conventional two-stage cooler with a moving porous piston heat exchanger. The porous piston heat exchanger, or simply the regenerator, functions as a heat exchanger. The porous piston is bifurcated for heat exchange into a first stage heat exchanger for exchange heat with a first stage volume and into a second stage heat exchanger for heat exchange with a second stage volume. A compressor provides the pressure and volume work required for cooling, by moving the piston. The compressor injects gas through an intake conduit into an empty volume, known as a plenum. The gas is cooled when passing through the porous heat exchanger. The piston in the cryocooler moves when a parcel of gas is admitted into the plenum through the intake conduit. The parcel of gas the...

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Abstract

Cryocoolers, including coolers, heaters, and heat pumps each having a first stage and a second stage, are modified with controlled and variable gas phase shifting devices for controlling gas pressure and mass flow between volumes of the first and second stages for improving the efficiency and temperature range of expander cryocoolers such as displacer cryocoolers using controlled valves as flow impedance devices and pulse tube cryocoolers using inertance gaps as flow inertia devices, for maximizing cooling between the first and second stages.

Description

REFERENCE TO RELATED APPLICATION[0001]The present application is related to applicant's copending applications entitled Gas Phase Shifting Multistage Displacer Cryocooler, Ser. No. ______, filed ______, Controlled and Variable Gas Phase Shifting Cryocooler Ser. No. ______, filed ______, and Gas Phase Shifting Inertance Gap Pulse Tube Cryocooler, Ser. No. ______, filed ______, by the same inventors.FIELD OF THE INVENTION[0002]The invention relates to the field of refrigeration systems. More particularly, the invention relates to cryocoolers providing phase shifting of gas pressures using controlled gas phase shifting devices in a multiple stage expander cryocooler and multiple stage pulse tube cryocooler for improved energy transfer and cooling efficiencies.BACKGROUND OF THE INVENTION[0003]Cryocoolers are mechanical machines used for cooling, heating, and thermal transfer. The cryocoolers typically have multiple internal volumes for heating and cooling. Multistage coolers are coolers...

Claims

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Application Information

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IPC IPC(8): F25B9/00
CPCF25B9/14F25B9/145F25B2309/1424F25B2309/1418F25B2309/1408
Inventor YUAN, SIDNEY W.K.CURRAN, DAVID G.T
Owner THE AEROSPACE CORPORATION
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