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Free piston expander

An expander and piston technology, applied in the field of low-temperature refrigeration, can solve the problems affecting the use of refrigerators, complex structure, adverse effects on life and vibration indicators, etc., and achieve the effects of small axial stiffness, reduced energy consumption, and large radial stiffness.

Active Publication Date: 2012-06-27
NO 510 INST THE FIFTH RES INST OFCHINA AEROSPAE SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Generally, the drive of the regenerator uses a motor, and the support is supported by a cylindrical spring. The phase adjustment of the regenerator uses the drive motor and spring stiffness.

Method used

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Examples

Experimental program
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Effect test

Embodiment

[0026] Such as figure 2 A free-piston expander is shown, and the expander includes: a plate spring 1, a gap seal seat 2, a regenerator 3, a cold finger 4, a cold cylinder 5, a drive rod 6, an end cover 7, a connecting pipe 8 and Peripheral compressors;

[0027] Wherein the cold cylinder 5 and the cold finger 4 are both cylindrical cavity structures, the diameter of the cold finger 4 is 1 / 5 to 1 / 3 of the cold cylinder 5, the cold cylinder 5 and the cold finger 4 are integrally structured, one end of the cold cylinder 5 and One end of the cold finger 4 is fixedly connected and the inner cavity is connected, and the other end of the cold cylinder 5 is welded with an end cover 7. The cold cylinder 5 and the end cover form a back pressure chamber, and one or more are placed in the back pressure chamber along the longitudinal axis of the cold cylinder 5 The leaf spring 1 has a hole in the center of the leaf spring 1, and the two ends are fixed on the cold cylinder 5;

[0028] The...

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PUM

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Abstract

The invention relates to a free piston expander and belongs to the field of low temperature refrigeration. The expander comprises a plate spring, a clearance sealing seat, a heat regenerator, a cold finger, a cold cylinder, a driving rod, an end cover, a tube connector and external equipment compressor. The cold cylinder and the cold finger are of an integrated structure. One or more plate springs are arranged in the cold cylinder. The center of the plate spring is provided with a hole. Both ends of the plate spring are fixed on the cold cylinder. The heat regenerator is positioned in the cold finger. A metal wire braided square hole net is filled in the heat regenerator. The driving rod is arranged at the front end of the heat regenerator. The driving rod extends into the cold cylinder, passes through the center of the plate spring and is fixedly connected with the center of the plate spring. The clearance sealing seat is positioned at the junction of the cold cylinder and an inner cavity of the cold finger. The application of the plate spring takes a rigid supporting effect. A driving motor is arranged in the cold cylinder, so that the energy consumption is reduced.

Description

technical field [0001] The invention relates to a free piston expander, which belongs to the field of low temperature refrigeration. Background technique [0002] Due to its many advantages, the Stirling refrigerator is currently widely used in space and on the ground, especially in imaging systems such as space infrared, which have high requirements on the vibration and life of the Stirling refrigerator, and its life index has generally reached Years. Such as figure 1 As shown, the Stirling refrigerator includes a compressor, an expander, and an intermediate pipe. During operation, the compressor generates periodically changing pressure waves, which are transmitted to the expander through the intermediate pipe to drive the regenerator cycle in the expander. The reciprocating motion generates cooling capacity in the cold chamber during the isothermal expansion process of the working medium gas movement in the chamber. The motion phase between the pressure wave and the reg...

Claims

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Application Information

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IPC IPC(8): F25B31/00F25B41/06
Inventor 许国太闫春杰王田刚霍英杰王小军孙述泽
Owner NO 510 INST THE FIFTH RES INST OFCHINA AEROSPAE SCI & TECH
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