IPC분류정보
국가/구분 |
United States(US) Patent
등록
|
국제특허분류(IPC7판) |
|
출원번호 |
US-0141876
(2005-06-01)
|
등록번호 |
US-7363767
(2008-04-29)
|
발명자
/ 주소 |
|
출원인 / 주소 |
|
대리인 / 주소 |
|
인용정보 |
피인용 횟수 :
2 인용 특허 :
6 |
초록
▼
A three-stage pulse-tube cryocooler, in which the third stage pulse tube is arranged below the second stage pulse tube, with a gas flow conduit between the second stage pulse tube heat exchanger and the cold end of the second stage regenerator. The design of the invention is much simpler than a conv
A three-stage pulse-tube cryocooler, in which the third stage pulse tube is arranged below the second stage pulse tube, with a gas flow conduit between the second stage pulse tube heat exchanger and the cold end of the second stage regenerator. The design of the invention is much simpler than a conventional three-stage parallel pulse tube cooler, requiring only two pulse tubes at the warm (room temperature) end and two reservoirs, with a corresponding reduction in the number of associated orifices, passages, etc. In effect, this provides a three stage cryocooler with a two-stage warm end design by putting the second and third stage pulse tubes in series, with a gas flow passage providing gas flow between the second and third stages for gas expansion and refrigeration. The three-stage design allows an intermediate temperature connection between the temperatures of the first and third stages, for applications which require three cooling temperatures.
대표청구항
▼
What is claimed is: 1. A three stage pulse-tube cryocooler comprising: a first stage regenerator having a hot end thermally coupled to a heat sink and a cold end, the hot end being in fluid communication with an oscillating source of working fluid under pressure; a first stage pulse tube having a h
What is claimed is: 1. A three stage pulse-tube cryocooler comprising: a first stage regenerator having a hot end thermally coupled to a heat sink and a cold end, the hot end being in fluid communication with an oscillating source of working fluid under pressure; a first stage pulse tube having a hot end thermally coupled to the heat sink and a cold end with a first stage cold end heat exchanger thermally coupled to a first stage cooling station, the cold end of the first stage pulse tube being fluid coupled to the cold end of the first stage regenerator through the first stage cold end heat exchanger; a second stage regenerator coupled for fluid flow in series with the first stage regenerator, having a hot end and a cold end; a second stage pulse tube having a hot end thermally coupled to the heat sink and a cold end thermally coupled to a second stage cooling station; a gas flow expansion passage providing a fluid coupling between the cold end of the second stage regenerator and the cold end of the second stage pulse tube; a third stage regenerator coupled for fluid flow in series with the second stage regenerator, having a hot end and a cold end; and a third stage pulse tube coupled for fluid flow in series with the second stage pulse tube, having a hot end thermally coupled to the second stage cooling station and a cold end having a third stage cold end heat exchanger thermally coupled to a third stage cooling station, the cold end of the third stage pulse tube being fluid coupled to the cold end of the third stage regenerator through the third stage cold end heat exchanger. 2. The three-stage cryocooler of claim 1, in which fluid flow in the gas flow expansion passage is controlled by an orifice in the passage. 3. The three-stage cryocooler of claim 1, in which fluid flow in the gas flow expansion passage is controlled by a diameter restriction in the passage. 4. The three-stage cryocooler of claim 1, in which the gas flow expansion passage is a tube. 5. The three-stage cryocooler of claim 1, in which the gas flow expansion passage is a capillary tube. 6. The three-stage cryocooler of claim 1, in which fluid flow in the gas flow expansion passage is controlled by a valve in the passage. 7. The three-stage cryocooler of claim 1, further comprising a second stage pulse tube heat exchanger in the cold end of the second stage pulse tube, thermally coupled to the second stage cooling station. 8. The three-stage cryocooler of claim 7, in which the second stage pulse tube heat exchanger is a screen region. 9. The three-stage cryocooler of claim 1, further comprising a screen region flow straightener in the cold end of the second stage pulse tube. 10. The three-stage cryocooler of claim 1, further comprising a second stage regenerator heat exchanger in the cold end of the second stage regenerator, thermally coupled to the second stage cooling station. 11. The three-stage cryocooler of claim 1, further comprising a third stage regenerator heat exchanger in the cold end of the third stage regenerator, thermally coupled to the third stage cooling station. 12. The three-stage cryocooler of claim 1, further comprising a first stage regenerator heat exchanger in the cold end of the first stage regenerator, thermally coupled to the first stage cooling station. 13. The three-stage cryocooler of claim 1, further comprising a heat exchanger in the hot end of the second stage pulse tube, thermally coupled to the heat sink. 14. The three-stage cryocooler of claim 1, further comprising a reservoir fluid coupled to the hot end of the first pulse tube through an orifice. 15. The three-stage cryocooler of claim 1, further comprising a reservoir fluid coupled to the hot end of the second pulse tube through an orifice. 16. The three-stage cryocooler of claim 1, in which the source of working fluid comprises a fluid compressor having a fluid output for supplying fluid under pressure and a fluid exhaust for receiving fluid, the fluid output and fluid exhaust being coupled to a rotary valve, alternately applying working fluid under pressure from the fluid output of the compressor to the hot end of the first stage regenerator and withdrawing fluid from the hot end of the first stage regenerator back to the compressor through the fluid exhaust. 17. The three-stage cryocooler of claim 1, in which the source of working fluid comprises a Stirling-type valveless pressure wave generator having a fluid output for supplying fluid under oscillating pressure to the hot end of the first stage regenerator.
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