An expander unit and a pulse-tube free-piston Stirling refrigerator

A technology of expander and refrigerator, which is applied in refrigerators, refrigeration and liquefaction, compressors, etc., can solve the problems of low efficiency and dissipation of pulse tube refrigerators, eliminate pump gas loss, reduce the quality of the whole machine, The effect of reducing the difficulty of manufacturing

Active Publication Date: 2020-04-03
UNIV OF SHANGHAI FOR SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The reason why the efficiency of the pulse tube refrigerator is lower than that of the Stirling refrigerator is mainly because the pulse tube refrigerator does not have a structure such as the expansion piston of the Stirling refrigerator, which "feeds back" the expansion work of the gas to the compression chamber. The expansion work of the hot end is mainly dissipated to the environment in the form of heat through phase-modulating mechanisms such as inertial tubes and small holes, resulting in low efficiency of pulse tube refrigerators

Method used

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  • An expander unit and a pulse-tube free-piston Stirling refrigerator
  • An expander unit and a pulse-tube free-piston Stirling refrigerator
  • An expander unit and a pulse-tube free-piston Stirling refrigerator

Examples

Experimental program
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Effect test

Embodiment 1

[0037] Such as figure 1 As shown, the coaxial pulse tube type free-piston Stirling refrigerator includes a linear motor 1 , a compression unit, an expander unit, an undamped dynamic vibration absorption unit 4 , a frame 50 , and a casing 60 .

[0038] Such as figure 2 , 3 , 4 and 5, the frame 50 includes a flange 52, a piston tube 51 and a base 53 arranged in the flange 52,

[0039] Wherein, the flange 52 is in the shape of a disk, and a concentric small disk 521 is arranged on one side of the flange, and a plurality of connecting through holes are uniformly arranged on the flange 52 .

[0040] The base 53 is cylindrical, one end is connected to one side of the flange 52, and the other end is a free end. The centerline of the base 53 coincides with the centerline of the flange 52. The free end of the base 53 is provided with a plurality of connecting screw holes 531 , in an embodiment, the base 53 is four legs arranged around the center line of the flange 52 .

[0041]The...

Embodiment 2

[0057] Such as Figure 7 As shown, the coaxial pulse tube type free-piston Stirling refrigerator includes a linear motor 1 , a compression unit, an expander unit, an undamped dynamic vibration absorption unit 4 , a frame 50B, and a casing 60 .

[0058] Such as Figure 8 , 9 , 10, the frame 50B includes a flange 52B, an expansion piston tube 51B, a compression piston tube 54B and a base 53B,

[0059] Wherein, the flange 52B is in the shape of a disk, one side of the flange 52B is provided with a concentric disk 521B, and the other side is connected to the base 53B, and the flange 52B is uniformly provided with a plurality of connection through holes.

[0060] The base 53B is cylindrical, one end is connected to the flange 52B, and the other end is a free end. The centerline of the base 53B coincides with the centerline of the flange 52B. A plurality of connecting screw holes 531B are arranged on the free end of the base 53B. Embodiment Among them, the base 53B is four legs a...

Embodiment 3

[0082] The other structure of this embodiment is the same as that of Embodiment 2, except that it also includes a deflector 32B arranged at one end of the pulse tube 31B and inside the pulse tube 31B, and the deflector 32B is connected with the cold end heat exchanger 24B.

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PUM

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Abstract

The invention discloses an expander unit and a pulse-tube type free piston Stirling refrigerator. The expander unit comprises an expansion piston, an expansion piston spring, an expansion piston rod,a first-stage head end heat exchanger, a second-stage head end heat exchanger, a regenerator, a pulse tube and a cold end heat exchanger; an expansion piston tube is a straight tube used for being connected with the pulse tube of a refrigerator and is internally provided with a cylindrical heat exchange cavity and a cylindrical expansion piston cavity; a compression piston tube is a straight tubeand is internally provided with a cylindrical compression piston cavity; the compression piston cavity is coaxial with the expansion piston cavity and communicates with the expansion piston cavity; parallel to the axis of the compression piston cavity, multiple through holes used for communicating the compression piston cavity with the external are formed in a disc; the inside diameter of the compression piston cavity is larger than the inside diameter of the expansion piston cavity; the inside diameter of the expansion piston cavity is larger than the inside diameter of the heat exchanger cavity; the inside diameter of the heat exchanger cavity is same as the inside diameter of the pulse tube; the expansion piston is arranged in the expansion piston tube; and the compression piston, the expansion piston, the compression piston cavity and the expansion piston cavity form a compression cavity.

Description

technical field [0001] The invention belongs to the refrigeration field, and in particular relates to an expander unit and a pulse-tube type free-piston Stirling refrigerator. Background technique [0002] As an important method to obtain low temperature, cryogenic refrigerator refrigeration is widely used in the fields of aviation, military, superconductivity, communication, electronics, metallurgy, industrial gas liquefaction, and biomedicine. Especially in recent years, the vigorous development of my country's aerospace industry has made the application requirements of cryogenic refrigerators in aerospace more and more obvious. [0003] GLACIER (General Laboratory Active Cryogenic ISSExperimentRefrigerator) is the first -80°C low-temperature storage device developed by NASA that can be used on two platforms of the space station and the spacecraft at the same time. It uses a free-piston Stirling refrigerator for cooling. Refrigeration temperature from 4°C to -95°C; in wat...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F25B9/14
CPCF25B9/14
Inventor 陈曦崔浩卢莎
Owner UNIV OF SHANGHAI FOR SCI & TECH
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