# US 12,000,497 B2 · Gm type cryogenic refrigerator rotary valve

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- Number: US 12,000,497 B2
- Document ID: US12000497B2
- Status: Granted
- Kind: B2
- Application number: 17/253,112
- Filed: 2018-12-06
- Published: 2021-09-02
- Granted: 2024-06-04
- Earliest claimed: 2018-07-02
- Assignees: Institute of New Materials, Guangdong Academy of Sciences
- Applicants: Institute of New Materials, Guangdong Academy of Sciences
- Inventors: Jifu Zhang; Xingchi Chen; Min Liu; Mingjiang Dai; Chunming Deng; Changguang Deng
- Web page: https://patentgrep.com/patent/US12000497B2

## CPC

- F16K 3/08: with circular plates rotatable around their centres
- C25D 11/024: {Anodisation under pulsed or modulated current or potential}
- C25D 11/026: {Anodisation with spark discharge}
- C25D 11/06: characterised by the electrolytes used
- C25D 11/10: containing organic acids
- C25D 11/18: After-treatment, e.g. pore-sealing
- F16K 3/085: {the axis of supply passage and the axis of discharge passage being coaxial and parallel to the axis of rotation of the plates}
- F16K 27/00: Construction of housing (methods for welding housings B23K); Use of materials therefor
- F25B 41/20: Disposition of valves, e.g. of on-off valves or flow control valves (expansion valves F25B41/31)
- F25B 9/14: characterised by the cycle used, e.g. Stirling cycle
- Y10T 137/86823: Rotary valve
- F16K: VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING {(devices for emptying and evacuating the excess liquid in valves or conduits F16L55/07)}
- C25D: PROCESSES FOR THE ELECTROLYTIC OR ELECTROPHORETIC PRODUCTION OF COATINGS; ELECTROFORMING; APPARATUS THEREFOR
- F25B: REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- Y10T: TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION

## 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.

## Claims

### Claim 1

A GM type cryogenic refrigerator rotary valve, wherein the GM type cryogenic refrigerator rotary valve comprises an aluminum alloy rotating valve and an alumina ceramic membrane;
the aluminum alloy rotating valve comprises a valve body, a high-pressure hole, a working boss, a low-pressure groove, a vent hole and an air chamber;
the valve body has a first surface for arranging the working boss and a second surface opposite to the first surface; the high-pressure hole and the low-pressure groove are both arranged in the working boss, the high-pressure hole penetrates throughout the valve body along a direction from the first surface to the second surface, the vent hole is provided in the first surface and penetrates throughout the valve body along the direction from the first surface to the second surface; and the air chamber is provided on the second surface;
the alumina ceramic membrane is plated on a surface of the aluminum alloy rotating valve.

### Claim 2 (depends on 1)

The GM type cryogenic refrigerator rotary valve of claim 1, wherein a height of the working boss protruding from the first surface is in a range from 0.4 mm to 0.6 mm.

### Claim 3 (depends on 1)

The GM type cryogenic refrigerator rotary valve of claim 1, wherein the alumina ceramic membrane has a thickness in a range from 60 μm to 80 μm;
a dense layer in the alumina ceramic membrane has a thickness greater than or equal to 50 μm.

### Claim 4 (depends on 1)

The GM type cryogenic refrigerator rotary valve of claim 1, wherein the GM type cryogenic refrigerator rotary valve has a surface roughness Ra≤0.1 μm for the working boss, and a surface roughness Ra≤3 μm for remaining surfaces.

### Claim 5 (depends on 1)

The GM type cryogenic refrigerator rotary valve of claim 1, wherein the high-pressure hole has a cross-section in a half-moon shape.

### Claim 6 (depends on 1)

The GM type cryogenic refrigerator rotary valve of claim 1, wherein the valve body includes a first cylindrical structure and a second cylindrical structure which are arranged coaxially with and connected to each other; the first cylindrical structure has a larger diameter than the second cylindrical structure; an end surface of the first cylindrical structure away from the second cylindrical structure forms the first surface, and an end surface of the second cylindrical structure away from the first cylindrical structure forms the second surface.

### Claim 7 (depends on 6)

The GM type cryogenic refrigerator rotary valve of claim 6, wherein the working boss has a cylindrical outer contour, and the working boss has a smaller diameter than the first cylindrical structure and the second cylindrical structure.

### Claim 8 (depends on 1)

The GM type cryogenic refrigerator rotary valve of claim 1, wherein the low-pressure groove has an elongated cross section, and both ends of the low-pressure groove are arcuate.

### Claim 9 (depends on 1)

The GM type cryogenic refrigerator rotary valve of claim 1, wherein the low-pressure groove is provided in the middle of the working boss, and the high-pressure hole is provided in an edge of the working boss.

### Claim 10 (depends on 1)

The GM type cryogenic refrigerator rotary valve of claim 1, wherein the vent hole is a circular hole, and the vent hole and the high-pressure hole are spaced apart.

### Claim 11 (depends on 1)

The GM type cryogenic refrigerator rotary valve of claim 1, wherein the air chamber is a circular groove, and an opening of the air chamber is in a flared structure with the opening inclined outwardly.