Gas bearing structure for linear compressor of Stirling cryocooler

By adding a third row of throttling orifices to the cylinder of the Stirling refrigeration linear compressor and improving its jet direction, the problem of uneven jet in the gas bearing structure was solved, stable piston support was achieved, and the life and efficiency of the equipment were improved.

CN121952833APending Publication Date: 2026-05-01UNIV OF SHANGHAI FOR SCI & TECH
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Patent Information

Application Number
CN202511962351.5
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2025-12-24
Publication Date
2026-05-01

AI Technical Summary

Technical Problem

In the existing gas bearing structure of the Stirling refrigeration linear compressor, uneven jetting at the first row of throttling orifices leads to insufficient axial support force on the piston, and may even cause the piston to contact the cylinder wall, affecting the equipment's lifespan and reliability.

Method used

A third row of throttle orifices is added to the cylinder and connected to the compression chamber through a bypass narrow channel. This changes the arrangement of the throttle orifices, causing the jet direction of the third row of throttle orifices to be inward, improving the uniformity of gas bearing capacity in the axial direction and providing radial support force.

Benefits of technology

By improving the uniformity of gas bearing capacity in the axial direction and avoiding contact between the piston and the cylinder wall, the lifespan and reliability of the equipment are improved, vibration and noise are reduced, and system efficiency is enhanced.

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Abstract

The invention belongs to the technical field of gas bearings, and relates to a gas bearing structure for a linear compressor of a Stirling cryocooler, the gas bearing structure comprises a first row of throttling holes formed in a piston and a third row of throttling holes formed in an air cylinder, and the third row of throttling holes are communicated with a compression cavity of the air cylinder through a bypass thin channel formed in the air cylinder; the first row of throttling holes sprays air to the inner wall of the air cylinder, the third row of throttling holes sprays air to the outer wall of the piston, the piston is located in the air cylinder, and an air film gap exists between the outer wall of the piston and the inner wall of the air cylinder so that the wall faces of the piston and the inner wall of the air cylinder can not make contact. The mode that the throttling holes are evenly distributed in the axial direction is changed, the third row of throttling holes are additionally formed between the first row of throttling holes and the second row of throttling holes, the third row of throttling holes is changed into the mode that air is sprayed inwards (towards the outer wall of the piston), and due to the fact that the third row of throttling holes is additionally formed, the balance of gas bearing capacity in the axial direction is improved; and radial supporting force is provided in the whole period.
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