Pulse tube refrigerating machine

Patent metadata

Field	Value
Publication number	US-11098931-B2
Application number	US-15384908-A
Country	US
Kind code	B2
Filing date	May 27, 2008
Priority date	May 30, 2007
Publication date	Aug 24, 2021
Grant date	Aug 24, 2021

Abstract

A pulse tube refrigerating machine enables maintenance of an orifice while circulation of refrigerant gas within individual components is allowed, thus reducing the time required for maintenance. A compressor delivers a refrigerant gas having a high pressure and sucks the refrigerant gas having a low pressure. A cold head including a regenerator tube through which the refrigerant gas circulates and a pulse tube is connected to a housing. The flow of the refrigerant gas is controlled by one or more orifices, which are disposed outside the housing. The compressor, the housing, and the orifices are coupled via tubing. A coupling unit is disposed at both ends of at least one of the orifices. The coupling unit has a structure such that it can be split while the refrigerant gas is retained within the tubing. When the coupling unit is split, a detachable unit portion including the orifice is isolated.

First claim

What is claimed is:

1. A pulse tube refrigerating machine comprising:
a valve unit configured to receive a working fluid from an exhaust of a compressor and to output the working fluid to an intake of the compressor, a flow path of the working fluid from the valve unit to a cold head permits a flow of the working fluid between the cold head and the valve unit;
a first coupling unit configured to sever the flow path of the working fluid from the valve unit to the cold head in a manner that permits a decoupling of the valve unit from the cold head, the decoupling of the valve unit from the cold head disconnects the cold head from the valve unit; and
an orifice configured to control the flow of the working fluid between the cold head and the valve unit, the orifice is attached to the valve unit before the decoupling of the valve unit from the cold head in a manner that permits the orifice to remain attached to the valve unit after the decoupling of the valve unit from the cold head.

2. The pulse tube refrigerating machine according to claim 1 , further comprising:
a second coupling unit configured to sever a flow path of the working fluid from the cold head to the orifice in a manner that permits the decoupling of the orifice from the cold head, the flow path of the working fluid from the cold head to the orifice permits a flow of the working fluid between the cold head and the orifice.

3. The pulse tube refrigerating machine according to claim 2 , wherein the first coupling unit is configured to permit a coupling of the cold head with the valve unit by connecting the valve unit to the cold head, the second coupling unit is configured to permit a coupling of the cold head with the orifice by connecting the orifice to the cold head.

4. The pulse tube refrigerating machine according to claim 2 , wherein at least one of the first and the second coupling units is a self-sealing coupling unit.

5. The pulse tube refrigerating machine according to claim 2 , wherein the first and second coupling units are configured to automatically close the flow path of the working fluid from the cold head to the valve unit and the orifice respectively after the decoupling of the valve unit from the cold head.

6. The pulse tube refrigerating machine according to claim 2 , further comprising:
a third coupling unit configured to permit a decoupling of the valve unit from the compressor in a manner that disconnects the compressor from the valve unit.

7. The pulse tube refrigerating machine according to claim 6 , wherein the third coupling unit is configured to permit a coupling of the compressor with the valve unit by connecting the valve unit to the compressor.

8. The pulse tube refrigerating machine according to claim 6 , wherein the third coupling unit is a self-sealing coupling unit.

9. The pulse tube refrigerating machine according to claim 6 , wherein the third coupling unit is configured to automatically close a flow path of the working fluid from the valve unit to the compressor after the decoupling of the valve unit from the compressor.

10. The pulse tube refrigerating machine according to claim 9 , wherein the flow path of the working fluid from the valve unit to the compressor permits a flow of the working fluid between the valve unit and either the exhaust of the compressor or the intake of the compressor.

11. The pulse tube refrigerating machine according to claim 1 , further comprising:
a tube configured to provide the flow path of the working fluid from the valve unit to the cold head.

12. The pulse tube refrigerating machine according to claim 11 , wherein a first segment of the tube couples the valve unit to the first coupling unit, the working fluid remains in the tube after the decoupling of the valve unit from the cold head.

13. The pulse tube refrigerating machine according to claim 12 , wherein a second segment of the tube couples the first coupling unit to the cold head, the decoupling of the valve unit from the cold head separates the first segment of the tube from the second segment of the tube.

14. The pulse tube refrigerating machine according to claim 13 , wherein the cold head includes a regenerator tube, the second segment of the tube couples the first coupling unit to the regenerator tube.

15. The pulse tube refrigerating machine according to claim 14 , wherein the cold head includes a pulse tube, tubing connects the pulse tube to the regenerator tube.

16. The pulse tube refrigerating machine according to claim 1 , wherein the compressor is configured to compress the working fluid so that the pressure the working fluid at the exhaust of the compressor is higher than the pressure the working fluid at the intake of the compressor.

17. The pulse tube refrigerating machine according to claim 1 , wherein the working fluid is a refrigerant gas.

Assignees

• Takayama Hirokazu
• Xu Mingyao
• Sumitomo Heavy Industries

Inventors

• Takayama Hirokazu
• Xu Mingyao

Classifications

• G01R33/3804

  Additional hardware for cooling or heating of the magnet assembly, for housing a cooled or heated part of the magnet assembly or for temperature control of the magnet assembly · CPC title

• F25B2309/14241

  Pulse tubes with basic schematic including an orifice reservoir multiple inlet pulse tube · CPC title

• G01R33/3815

  with superconducting coils, e.g. power supply therefor · CPC title

• F25B2500/221

  Preventing leaks from developing · CPC title

• F25B2309/1418

  Pulse-tube cycles with valves in gas supply and return lines · CPC title