JP2009511850A - Drive structure for rotary valve in cryogenic cooling system - Google Patents
Drive structure for rotary valve in cryogenic cooling system Download PDFInfo
- Publication number
- JP2009511850A JP2009511850A JP2008534086A JP2008534086A JP2009511850A JP 2009511850 A JP2009511850 A JP 2009511850A JP 2008534086 A JP2008534086 A JP 2008534086A JP 2008534086 A JP2008534086 A JP 2008534086A JP 2009511850 A JP2009511850 A JP 2009511850A
- Authority
- JP
- Japan
- Prior art keywords
- cooling device
- cryogenic cooling
- fluid motor
- rotary valve
- rotary
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Abandoned
Links
- 238000001816 cooling Methods 0.000 title claims abstract description 29
- 239000012530 fluid Substances 0.000 claims description 33
- 238000005481 NMR spectroscopy Methods 0.000 claims description 4
- 239000000696 magnetic material Substances 0.000 claims description 4
- 238000002595 magnetic resonance imaging Methods 0.000 claims 1
- 239000000463 material Substances 0.000 abstract description 5
- 239000002360 explosive Substances 0.000 abstract 1
- 239000007789 gas Substances 0.000 description 18
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 description 2
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 2
- 238000004880 explosion Methods 0.000 description 2
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 2
- 239000003570 air Substances 0.000 description 1
- 229910052786 argon Inorganic materials 0.000 description 1
- 230000005284 excitation Effects 0.000 description 1
- 239000001307 helium Substances 0.000 description 1
- 229910052734 helium Inorganic materials 0.000 description 1
- SWQJXJOGLNCZEY-UHFFFAOYSA-N helium atom Chemical compound [He] SWQJXJOGLNCZEY-UHFFFAOYSA-N 0.000 description 1
- 238000003384 imaging method Methods 0.000 description 1
- 229910052754 neon Inorganic materials 0.000 description 1
- GKAOGPIIYCISHV-UHFFFAOYSA-N neon atom Chemical compound [Ne] GKAOGPIIYCISHV-UHFFFAOYSA-N 0.000 description 1
- 229910052757 nitrogen Inorganic materials 0.000 description 1
- 239000003921 oil Substances 0.000 description 1
- 239000002887 superconductor Substances 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
- F04C18/00—Rotary-piston pumps specially adapted for elastic fluids
- F04C18/22—Rotary-piston pumps specially adapted for elastic fluids of internal-axis type with equidirectional movement of co-operating members at the points of engagement, or with one of the co-operating members being stationary, the inner member having more teeth or tooth equivalents than the outer member
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
- F16K31/00—Actuating devices; Operating means; Releasing devices
- F16K31/12—Actuating devices; Operating means; Releasing devices actuated by fluid
- F16K31/16—Actuating devices; Operating means; Releasing devices actuated by fluid with a mechanism, other than pulling-or pushing-rod, between fluid motor and closure member
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
- F16K31/00—Actuating devices; Operating means; Releasing devices
- F16K31/12—Actuating devices; Operating means; Releasing devices actuated by fluid
- F16K31/36—Actuating devices; Operating means; Releasing devices actuated by fluid in which fluid from the circuit is constantly supplied to the fluid motor
- F16K31/38—Actuating devices; Operating means; Releasing devices actuated by fluid in which fluid from the circuit is constantly supplied to the fluid motor in which the fluid works directly on both sides of the fluid motor, one side being connected by means of a restricted passage and the motor being actuated by operating a discharge from that side
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B9/00—Compression machines, plants or systems, in which the refrigerant is air or other gas of low boiling point
- F25B9/14—Compression machines, plants or systems, in which the refrigerant is air or other gas of low boiling point characterised by the cycle used, e.g. Stirling cycle
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B9/00—Compression machines, plants or systems, in which the refrigerant is air or other gas of low boiling point
- F25B9/14—Compression machines, plants or systems, in which the refrigerant is air or other gas of low boiling point characterised by the cycle used, e.g. Stirling cycle
- F25B9/145—Compression machines, plants or systems, in which the refrigerant is air or other gas of low boiling point characterised by the cycle used, e.g. Stirling cycle pulse-tube cycle
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B2309/00—Gas cycle refrigeration machines
- F25B2309/006—Gas cycle refrigeration machines using a distributing valve of the rotary type
Landscapes
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Electrically Driven Valve-Operating Means (AREA)
Abstract
本発明の極低温冷却装置は、供給される高圧ガスの流れ及びその冷却装置からのガスの戻りの流れを制御する回転弁を有し、更にこの回転弁を駆動するように配置された回転流体モータを有する。この装置は、電磁干渉に敏感なシステムに高い磁場が加わり、又は環境内に可燃物質や爆発の危険がある物質が存在する用途での使用に適し、電動モータを用いる従来装置のように電磁干渉を起こしたり、モータの動作が劣化したりすることがない。 The cryogenic cooling device of the present invention has a rotary valve for controlling the flow of the high-pressure gas supplied and the return flow of the gas from the cooling device, and is further arranged to drive the rotary valve. Has a motor. This device is suitable for use in applications where a high magnetic field is applied to a system that is sensitive to electromagnetic interference, or where there are flammable materials or materials that are potentially explosive in the environment. Will not cause the motor operation to deteriorate.
Description
極低温冷却装置には極低温ガスの液化、クライオスタット要素の伝導冷却、超伝導体の直接及び間接冷却のような多数の応用面があり、また真空状態を維持するための低温源としての用途もある。一般に、この種冷却装置は、冷却装置の膨張室への及び膨張室からのヘリウム、ネオン、窒素、アルゴン又はメタン等の圧縮ガスの配分を管理すべく回転弁を利用している。 Cryogenic cooling devices have many applications such as cryogenic gas liquefaction, conduction cooling of cryostat elements, direct and indirect cooling of superconductors, and can also be used as a low temperature source to maintain vacuum conditions. is there. Generally, this type of cooling device utilizes a rotary valve to manage the distribution of compressed gas such as helium, neon, nitrogen, argon or methane to and from the expansion chamber of the cooling device.
従来技術の一例として、機械的に駆動される２段ギフォードマクマホン冷却装置は「スコッチヨーク」を介してガスディスプレーサ(gas displacer)を駆動すべく、電動モータ例えばステップモータを用いている。更に、ガス圧縮機から冷却装置への高圧ガスの流れ及びガス圧縮機への戻りガスを制御する回転弁を電動モータで駆動している。 As an example of the prior art, a mechanically driven two-stage Gifford McMahon cooling device uses an electric motor, such as a step motor, to drive a gas displacer through a “Scotch yoke”. Further, a rotary valve that controls the flow of high-pressure gas from the gas compressor to the cooling device and the return gas to the gas compressor is driven by an electric motor.
また、低温冷却装置はガスで駆動されるガスディスプレータを用いることもある。他の極低温冷却装置はパルスチューブ型であり、その場合、圧縮ガスの流れは制御されるが、動的なガスディスプレータは無い。そのような冷却装置は回転弁を作動すべく、現在でも電動モータが使用されている。 The low-temperature cooling device may use a gas display driven by gas. Other cryogenic cooling devices are of the pulse tube type, in which the flow of compressed gas is controlled but there is no dynamic gas display. Such a cooling device still uses an electric motor to operate the rotary valve.
ある種の環境、例えば電動モータにより生じる電磁干渉に敏感なシステムに高い磁場が存在する場合や、環境内に可燃物質又は爆発の危険がある場合には、電気的な励起に基づく回転駆動機構は実用的でないか或いは好ましくない。考え得る解決方法の一つは駆動モータを回転弁から放して配置し、回転弁に対し機械的な駆動接続、例えば駆動軸又は駆動ケーブルを設けることである。幾つかの応用では、この種の機械的な構成を有することは好ましくない。電気的駆動の必要ない回転弁の駆動構成を設けるのが望ましい。 In some environments, for example when high magnetic fields are present in systems that are sensitive to electromagnetic interference caused by electric motors, or when there is a risk of flammable materials or explosions in the environment, a rotary drive mechanism based on electrical excitation is Not practical or preferred. One possible solution is to place the drive motor away from the rotary valve and provide a mechanical drive connection, such as a drive shaft or drive cable, to the rotary valve. In some applications it is not desirable to have this type of mechanical configuration. It is desirable to provide a rotary valve drive configuration that does not require electrical drive.
従って、本発明は次のような極低温冷却装置を提供する。即ち、この装置は高圧ガスの前記冷却装置への流れ及び前記冷却装置からの上記ガスの戻りの流れを制御する回転弁を有し、更に前記回転弁を駆動すべく配置された回転流体モータを有しており、上記回転流体モータが高強度の或いは鋭敏な磁場内で使用するために非磁性材料で構成される。 Accordingly, the present invention provides the following cryogenic cooling device. That is, this device has a rotary valve for controlling the flow of high-pressure gas to the cooling device and the return flow of the gas from the cooling device, and further comprises a rotary fluid motor arranged to drive the rotary valve. And the rotary fluid motor is made of a non-magnetic material for use in a high-intensity or sensitive magnetic field.
本発明によれば、極低温冷却装置の回転弁を駆動するために従来用いられてきた電動モータが回転流体モータ、例えば多翼型回転流体モータで置換される。この回転流体モータは、高強度の磁場或いは鋭敏な磁場内で使用するために非磁性材料で構成される。 According to the present invention, the electric motor conventionally used for driving the rotary valve of the cryogenic cooling device is replaced with a rotary fluid motor, for example, a multiblade rotary fluid motor. This rotary fluid motor is constructed of a non-magnetic material for use in a high intensity magnetic field or a sensitive magnetic field.
この回転流体モータは上記回転弁を直接に駆動すべく配置されても或いは歯車装置を介して上記回転弁を駆動すべく配置されてもよい。その応用及び環境、即ち高強度の磁場においての使用に適した非磁性材料で構成される。上記回転流体モータは空気、ガス、水又は油のような適当な流体により駆動できる。従来の如く、典型的には電動モータにより駆動されそして上記回転流体モータから離れて配置されるポンプをその回転流体モータに流体を循環すべく用いる。これは、電動モータが可燃物、爆発の恐れ又は鋭敏な磁場等の危険から遠ざけて配置される点で有利である。また、回転流体モータは、回転弁を駆動する電動モータの使用を防止し又は抑制する極限温度に対し耐性を持つように製造される。この回転流体モータは非磁性なものとして製造され、回転弁の駆動に電動モータの使用を妨げ或いは抑えるような強い磁場又は鋭敏な磁場内で回転流体モータを使用可能とする。 The rotary fluid motor may be arranged to drive the rotary valve directly or may be arranged to drive the rotary valve via a gear device. It is composed of a non-magnetic material suitable for its application and environment, i.e. for use in high intensity magnetic fields. The rotary fluid motor can be driven by a suitable fluid such as air, gas, water or oil. As is conventional, a pump, typically driven by an electric motor and located remotely from the rotating fluid motor, is used to circulate fluid through the rotating fluid motor. This is advantageous in that the electric motor is positioned away from the dangers of combustibles, explosion hazards or sensitive magnetic fields. Also, the rotary fluid motor is manufactured to withstand extreme temperatures that prevent or suppress the use of an electric motor that drives the rotary valve. The rotary fluid motor is manufactured as a non-magnetic one, and the rotary fluid motor can be used in a strong magnetic field or a sharp magnetic field that prevents or suppresses the use of the electric motor for driving the rotary valve.
回転流体モータをガス駆動する場合、回転流体モータを駆動するために用いるガスは、駆動される回転弁で切り替えられる圧縮ガス源から取り出せる。 When the rotary fluid motor is gas driven, the gas used to drive the rotary fluid motor can be taken from a compressed gas source that is switched by a driven rotary valve.
特に有利な実施例では、核磁気共鳴（NMR）又は磁気共鳴表示（MRI）システムの磁石コイルを収容するためのクライオスタットの極低温冷却装置の回転弁の駆動に本発明を適用する。この種冷却装置は、外部磁場からの干渉を防止せねばならない高強度の磁場内で動作する。かかる環境は電動モータの配置には不適当である。何故なら、電動モータの動作が高強度の磁場により劣化することがありそして電動モータが画像化に用いられる磁場の均一性を劣化させるに充分な電磁干渉を発生し得るからである。極低温冷却装置の回転弁は、一般に室温に近い温度で流体を切り替えるべく使用される。非磁性材料からなる回転流体モータは回転弁に設けてもよい。この種回転流体モータは高強度の磁場に影響されることはなく、電磁干渉を発生することもない。回転流体モータの材料とそれを駆動するための流体を注意深く選択することで、回転流体モータを、使用温度に対し耐性のあるものになし得る。特に有利な実施例では、回転流体モータを駆動すべく使用する流体は回転弁により切り替えられる圧縮ガス源から取り出せる。 In a particularly advantageous embodiment, the invention is applied to the drive of a rotary valve of a cryostat cryocooler for housing a magnetic coil of a nuclear magnetic resonance (NMR) or magnetic resonance display (MRI) system. This type of cooling device operates in a high-intensity magnetic field that must prevent interference from external magnetic fields. Such an environment is unsuitable for electric motor placement. This is because the operation of the electric motor can be degraded by a high intensity magnetic field and the electric motor can generate sufficient electromagnetic interference to degrade the uniformity of the magnetic field used for imaging. The rotary valve of the cryogenic cooling device is generally used to switch the fluid at a temperature close to room temperature. A rotary fluid motor made of a nonmagnetic material may be provided on the rotary valve. This kind of rotary fluid motor is not affected by a high-intensity magnetic field and does not generate electromagnetic interference. By carefully selecting the material of the rotating fluid motor and the fluid to drive it, the rotating fluid motor can be made resistant to the operating temperature. In a particularly advantageous embodiment, the fluid used to drive the rotary fluid motor can be taken from a compressed gas source that is switched by a rotary valve.
Claims (7)
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB0520389A GB2430996B (en) | 2005-10-07 | 2005-10-07 | Drive arrangement for rotary valve in a cryogenic refrigerator |
| PCT/GB2006/050309 WO2007042839A1 (en) | 2005-10-07 | 2006-10-02 | Drive arrangement for rotary valve in a cryogenic refrigerator |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JP2009511850A true JP2009511850A (en) | 2009-03-19 |
Family
ID=35429962
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2008534086A Abandoned JP2009511850A (en) | 2005-10-07 | 2006-10-02 | Drive structure for rotary valve in cryogenic cooling system |
Country Status (5)
| Country | Link |
|---|---|
| US (1) | US20080236176A1 (en) |
| JP (1) | JP2009511850A (en) |
| CN (1) | CN101278160A (en) |
| GB (1) | GB2430996B (en) |
| WO (1) | WO2007042839A1 (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2496573B (en) * | 2011-09-27 | 2016-08-31 | Oxford Instr Nanotechnology Tools Ltd | Apparatus and method for controlling a cryogenic cooling system |
Family Cites Families (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS56621B2 (en) * | 1972-02-11 | 1981-01-08 | ||
| US4143520A (en) * | 1977-12-23 | 1979-03-13 | The United States Of America As Represented By The Secretary Of The Navy | Cryogenic refrigeration system |
| US4538416A (en) * | 1983-09-29 | 1985-09-03 | Air Products And Chemicals, Inc. | Method and apparatus for valve motor actuation of a displacer-expander refrigerator |
| JPH02146471A (en) * | 1988-11-28 | 1990-06-05 | Toshiba Corp | Cryogenic refrigerator |
| US5385021A (en) * | 1992-08-20 | 1995-01-31 | Sunpower, Inc. | Free piston stirling machine having variable spring between displacer and piston for power control and stroke limiting |
| JP2785769B2 (en) * | 1995-11-09 | 1998-08-13 | ダイキン工業株式会社 | Cryogenic refrigerator |
| JP2001509566A (en) * | 1997-07-11 | 2001-07-24 | サーモ キング コーポレイション | High efficiency rotary vane motor |
| JP3584185B2 (en) * | 1999-09-21 | 2004-11-04 | エア・ウォーター株式会社 | Refrigerator and rotary valve used therefor |
| US6378312B1 (en) * | 2000-05-25 | 2002-04-30 | Cryomech Inc. | Pulse-tube cryorefrigeration apparatus using an integrated buffer volume |
| JP3754992B2 (en) * | 2001-08-03 | 2006-03-15 | 住友重機械工業株式会社 | Multi-system refrigerator operation method, apparatus, and refrigeration apparatus |
| GB0125084D0 (en) * | 2001-10-19 | 2001-12-12 | Oxford Magnet Tech | Rotary valve |
| US6560969B1 (en) * | 2002-04-05 | 2003-05-13 | Ge Medical Systems Global Technology, Co., Llc | Pulse tube refrigeration system having ride-through |
-
2005
- 2005-10-07 GB GB0520389A patent/GB2430996B/en not_active Expired - Fee Related
-
2006
- 2006-10-02 JP JP2008534086A patent/JP2009511850A/en not_active Abandoned
- 2006-10-02 CN CNA2006800369255A patent/CN101278160A/en active Pending
- 2006-10-02 US US12/088,381 patent/US20080236176A1/en not_active Abandoned
- 2006-10-02 WO PCT/GB2006/050309 patent/WO2007042839A1/en not_active Ceased
Also Published As
| Publication number | Publication date |
|---|---|
| US20080236176A1 (en) | 2008-10-02 |
| GB2430996A (en) | 2007-04-11 |
| GB2430996B (en) | 2009-08-26 |
| GB0520389D0 (en) | 2005-11-16 |
| WO2007042839A1 (en) | 2007-04-19 |
| CN101278160A (en) | 2008-10-01 |
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| Date | Code | Title | Description |
|---|---|---|---|
| A621 | Written request for application examination |
Free format text: JAPANESE INTERMEDIATE CODE: A621 Effective date: 20081225 |
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| A762 | Written abandonment of application |
Free format text: JAPANESE INTERMEDIATE CODE: A762 Effective date: 20100216 |