Gm type cryogenic refrigerator rotary valve

US12000497B2 · kind B2 · utility

Assignee

• Institute of New Materials, Guangdong Academy of Sciences · CN

Inventors

• Jifu Zhang · Longbeilingcun, CN
• Xingchi Chen · Nanhu, CN
• Min Liu · Longbeilingcun, CN
• Mingjiang Dai · Longbeilingcun, CN
• Chunming Deng · Longbeilingcun, CN
• Changguang Deng · Longbeilingcun, CN

Key dates

• Filing date: Dec 6, 2018
• Grant date: Jun 4, 2024
• Expiry date: Dec 18, 2040

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y10T137/86823
• WIPO field: Surface technology, coating
• WIPO sector: Chemistry

Abstract

Disclosed are a GM type cryogenic refrigerator rotary valve and a preparation method therefor. The GM type cryogenic refrigerator rotary valve comprises an aluminum alloy rotating valve and an alumina ceramic membrane. A valve body of the aluminum alloy rotating valve is provided with a first surface for arranging a working boss and a second surface opposite to the first surface; and a high-pressure hole and a low-pressure groove are both provided in the working boss, and a vent hole is provided in the first surface; the high-pressure hole and the vent hole both penetrate the valve body, and an air chamber is formed on the second surface. The alumina ceramic membrane is plated on surface of the aluminum alloy rotating valve. The preparation method comprises: plating an alumina ceramic membrane on surface of an aluminum alloy rotating valve by means of a micro-arc oxidation process.