A low-temperature refrigerator directly driven by a free-piston engine

A technology of piston engine and cryogenic refrigerator, applied in refrigerators, refrigeration and liquefaction, compressors, etc., can solve problems such as energy waste, and achieve the effect of facilitating subsequent storage and transportation

Active Publication Date: 2021-04-13
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

For example, in oil fields, oilfield associated gas (i.e. natural gas) is often discharged or burned directly because it is a by-product of oil extraction, resulting in a huge waste of energy. Effective methods are urgently needed to liquefy and recover this part of the associated gas.

Method used

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  • A low-temperature refrigerator directly driven by a free-piston engine
  • A low-temperature refrigerator directly driven by a free-piston engine
  • A low-temperature refrigerator directly driven by a free-piston engine

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] see figure 1 , The cryogenic refrigerator directly driven by the free piston engine of this embodiment is a traveling wave thermoacoustic cryogenic refrigerator, comprising: intake valve 1, spark plug 2, exhaust valve 3, combustion chamber 4, opposed double pistons 5, return spring 6. Resonant tube 7, secondary cooler 8, thermal buffer tube 9, cold end heat exchanger 10, regenerator 11, main cooler 12. Fuel gas and auxiliary gas enter the combustion chamber 4 of the free-piston engine from the intake valve 1, ignite through the spark plug 2 and do work to push the opposed dual pistons 5 to move, and the exhaust gas is discharged through the exhaust valve 3. The periodic movement of the opposed double pistons 5 generates a pressure wave at one end of the resonant tube 7 of the traveling wave thermoacoustic cryogenic refrigerator, and the gas working medium in the regenerator 11 is absorbed from the side of the cold end heat exchanger 10 under the action of the pressure w...

Embodiment 2

[0028] see figure 2 , the low-temperature refrigerator directly driven by the free-piston engine of the present embodiment is a Stirling pulse tube cryogenic refrigerator, comprising: intake valve 1, spark plug 2, exhaust valve 3, combustion chamber 4, opposed double pistons 5, recovery Spring 6, transfer pipe 13, regenerator hot end heat exchanger 14, regenerator 11, cold end heat exchanger 10, pulse tube 15, pulse tube hot end heat exchanger 16, inertia tube 17, gas storage 18. Fuel gas and auxiliary gas enter the combustion chamber 4 of the free-piston engine from the intake valve 1, ignite through the spark plug 2 and do work to push the opposed dual pistons 5 to move, and the exhaust gas is discharged through the exhaust valve 3. The periodic movement of the opposed double pistons 5 generates a pressure wave at one end of the transfer tube of the Stirling pulse tube cryogenic refrigerator, and the gas working medium in the regenerator 11 passes through the heat exchanger...

Embodiment 3

[0030] The low-temperature refrigerator directly driven by the free-piston engine of this embodiment is a Stirling low-temperature refrigerator, comprising: intake valve 1, spark plug 2, exhaust valve 3, combustion chamber 4, opposed double pistons 5, return spring 6, Compression chamber, push piston, expansion chamber, cold end heat exchanger 10, regenerator 11, water cooler, connecting rod, elastic air chamber, push piston spring. Fuel gas and auxiliary gas enter the combustion chamber 4 of the free-piston engine from the intake valve 1, ignite through the spark plug 2 and do work to push the opposed dual pistons to move, and the exhaust gas is discharged through the exhaust valve 3. The pressure waves generated by the periodic motion of the opposed double pistons 5 work together with the elastic air cavity and the pushing piston spring to drive the Stirling cryogenic refrigerator to work. At the beginning, the pushing piston is at the top dead center, and the opposite doubl...

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PUM

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Abstract

The invention discloses a low-temperature refrigerator directly driven by a free-piston engine, which belongs to the technical field of low-temperature refrigerators, and comprises a free-piston engine and a low-temperature refrigerator. Opposed double pistons are arranged between the free-piston engine and the low-temperature refrigerator; One end of the double piston is movably connected in the combustion chamber of the free-piston engine, and the other end is movably connected to the cryogenic refrigerator. The free-piston engine is coupled with the cryogenic refrigerator driven by pressure waves through the opposed double pistons, and the pressure wave generated by the free-piston engine is transmitted to the cryogenic refrigerator through the opposed double pistons for cooling, realizing the off-grid application of the cryogenic refrigerator.

Description

technical field [0001] The invention relates to the technical field of cryogenic refrigerators, in particular to a cryogenic refrigerator directly driven by a free piston engine. Background technique [0002] As a new type of power plant, the free piston engine has gradually attracted people's attention because of its low consumption and high efficiency. The free-piston engine omits the crank-link mechanism and mechanical flywheel that convert the reciprocating motion of the piston into rotational motion in terms of mechanical structure, directly uses the reciprocating motion of the piston in the combustion chamber to drive the load, and directly converts the heat energy generated by fuel combustion into mechanical work output. It has the characteristics of wide fuel adaptability, high energy transfer efficiency, less conversion links and compact mechanical structure. [0003] Cryogenic refrigerators generally refer to refrigerators with a cooling temperature below 120K, wh...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F25B9/14F25B27/00
CPCF25B9/145F25B27/00
Inventor 王凯邱国毅植晓琴邱利民
Owner ZHEJIANG UNIV
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