Labyrinth seal piston for G-M refrigerator

A technology of labyrinth seals and refrigerators, applied to mechanical equipment, variable displacement pump components, machines/engines, etc., can solve the problems of increased processing difficulty and complex structure, and achieve low processing and assembly difficulty, simple piston structure, and durable good grinding effect

Inactive Publication Date: 2011-01-19
SHANGHAI JIAO TONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In the above-mentioned patent, both the cylinder body and the piston are engraved with sealing grooves, the structure is complicated, and the processing difficulty is increased, and the labyrinth sealing structure is mainly used in the piston compressor, while in the G-M refrigerator, the piston not only plays the role of compressing and expanding the gas, At the same time, it is filled with cold storage material inside, which acts as a regenerator, and there is no problem of oil return. Therefore, both the working principle of the piston and the working temperature range are quite different from the traditional piston compressor.

Method used

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  • Labyrinth seal piston for G-M refrigerator
  • Labyrinth seal piston for G-M refrigerator
  • Labyrinth seal piston for G-M refrigerator

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Embodiment Construction

[0021] The embodiments of the present invention are described in detail below. This embodiment is implemented on the premise of the technical solution of the present invention, and detailed implementation methods and specific operating procedures are provided, but the protection scope of the present invention is not limited to the following implementation example.

[0022] figure 1 It is a traditional sealing ring piston structure diagram, the piston 2 is made of bakelite or glass fiber reinforced plastics; the interior of the piston 2 is filled with cold storage material 6, which is driven by the motor to reciprocate inside the cylinder 1; the outer surface of the piston 2 has 2 to 3 sealing grooves 3. There are piston ring 4 and expansion ring 5 inside the sealing groove 3, which play a sealing role during the reciprocating movement of the piston. Due to wear between the piston ring 4 and the cylinder 1, long-term operation will affect the operation stability, reliability a...

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Abstract

The invention relates to a labyrinth seal piston for a G-M refrigerator in the technical field of mechanical pistons. The piston is positioned inside a cylinder of the refrigerator and driven by a motor to move inside the cylinder in a reciprocating way and has a cylindrical structure; the piston is integrally made of the same material as that of the cylinder of the refrigerator or a material of which the thermal shrinkage at a low temperature is lower than that of the material of the cylinder; the outer surface of the piston is provided with a plurality of seal grooves which are vertical to the axle center of a cylinder; and a polyfluortetraethylene wear-resistant coating is formed outside the entire piston. The sealing performance, running stability and reliability of the G-M refrigerator can be improved effectively and the service life can be prolonged effectively.

Description

technical field [0001] The invention relates to a device in the technical field of piston sealing, in particular to a labyrinth-sealed piston used in a G-M refrigerator. Background technique [0002] In recent years, with the rapid development of large cryogenic vacuum pumps, high and low temperature superconducting devices, nuclear magnetic resonance imaging (MRI), infrared detectors, and low temperature optoelectronic devices, the industrial demand for large cooling capacity refrigerators is also growing. The G-M refrigerator with large cooling capacity has become an important research direction in the field of cryogenic refrigerators. For the two-stage G-M refrigerator, the piston ring sealing method is used between the two-stage piston and the cylinder in the traditional structure. This method has high requirements for the material and processing accuracy of the piston ring and its expansion ring, and there is wear between the piston ring and the cylinder. , long-term o...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F04B39/00
Inventor 郝熙欢巨永林
Owner SHANGHAI JIAO TONG UNIV
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