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公开(公告)号：EP0835413B1
公开(公告)日：2004-09-01
申请号：EP96923365.9
申请日：1996-06-21
申请人： APD CRYOGENICS INC.
CPC分类号： F25B9/006 , F17C13/006 , F17C2221/012 , F17C2221/017 , F17C2221/038 , F17C2223/0161 , F17C2223/033 , Y02E60/321
摘要： A closed cycle cryogenic refrigerating system (10) with a fixed restrictor (28) operates with a compressor inlet (22) pressure in a range of 0.1 Mpa and 2.5 Mpa. A basic cryogenic refrigerant mixture is used to which is added approximately 3 % to 25 % of helium, hydrogen and/or neon. A ratio of refrigerant density at the inlet of the fixed restrictor (28) between steady-state operation and operation at the beginning of cool-down is in an approximate range of 7 to 17. Relatively rapid cool-down is achieved and evaporator (3) temperature is maintained in an approximate range of 70K to 120K.
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公开(公告)号：EP0892662A4
公开(公告)日：2001-09-19
申请号：EP97914932
申请日：1997-03-12
申请人： APD CRYOGENICS INC
发明人： LONGSWORTH RALPH C , LOTZ FRANCIS T
CPC分类号： F04B37/08 , B01D8/00 , F25B9/006 , Y10S417/901
摘要： A Group I gas cryopumping system includes a compressor throttle cycle refrigerator (10) using mixed refrigerants. Cold refrigerant flows through a cryopumping surface (44) located in a vacuum chamber, whereon vapor freezes. The refrigerant then passes through a heat exchanger (36) in cross flow with refrigerant from the compressor (18). Refrigerant flow entering and leaving the heat exchanger (36) is in uninsulated lines at substantially room temperature. All exposed cold lines are eliminated. The throttle device (42) and cold cryopumping surface (44) are an integral unit that connects directly to the flow paths of the heat exchanger (36) without intermediate lines. The compressor/aftercooler unit may be located at any convenient distance from the heat exchanger (36) and cryopumping surface (44), and the heat exchanger (36) is located immediately adjacent to the pumping surface (44) in a separate housing (46) outside the vacuum chamber (14).
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公开(公告)号：EP0835413A1
公开(公告)日：1998-04-15
申请号：EP96923365.0
申请日：1996-06-21
申请人： APD CRYOGENICS INC.
CPC分类号： F25B9/006 , F17C13/006 , F17C2221/012 , F17C2221/017 , F17C2221/038 , F17C2223/0161 , F17C2223/033 , Y02E60/321
摘要： A closed cycle cryogenic refrigerating system (10) with a fixed restrictor (28) operates with a compressor inlet (22) pressure in a range of 0.1 Mpa and 2.5 Mpa. A basic cryogenic refrigerant mixture is used to which is added approximately 3 % to 25 % of helium, hydrogen and/or neon. A ratio of refrigerant density at the inlet of the fixed restrictor (28) between steady-state operation and operation at the beginning of cool-down is in an approximate range of 7 to 17. Relatively rapid cool-down is achieved and evaporator (3) temperature is maintained in an approximate range of 70K to 120K.
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公开(公告)号：EP0720719A4
公开(公告)日：1997-12-10
申请号：EP94929877
申请日：1994-09-23
申请人： APD CRYOGENICS INC
发明人： LONGSWORTH RALPH C
CPC分类号： F25B9/14 , F25B23/006 , H01F6/04 , Y10S505/892
摘要： Apparatus and methods for cooling a superconducting magnet (11) by circulating a pressurized helium gas through a convective cooling loop (13) by natural convection, and for quickly and effectively cooling a warm superconducting magnet (11) down to operating temperature.
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公开(公告)号：EP0720719A1
公开(公告)日：1996-07-10
申请号：EP94929877.0
申请日：1994-09-23
申请人： APD CRYOGENICS INC.
CPC分类号： F25B9/14 , F25B23/006 , H01F6/04 , Y10S505/892
摘要： Apparatus and methods for cooling a superconducting magnet (11) by circulating a pressurized helium gas through a convective cooling loop (13) by natural convection, and for quickly and effectively cooling a warm superconducting magnet (11) down to operating temperature.
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公开(公告)号：EP0650574A1
公开(公告)日：1995-05-03
申请号：EP94915944.0
申请日：1994-04-29
申请人： APD CRYOGENICS INC.
CPC分类号： F25B9/02 , F25B9/006 , F25B31/004 , F25B2400/12
摘要： A closed cycle refrigerating system for cryogenic temperatures using a single stage compressor (12) with a refrigerant comprising a gas mixture. The refrigerating system includes a heat exchanger (28) having a throttling orifice (34) which is arranged to provide refrigeration, and a single stage oil lubricated compressor (12) for compressing the refrigerant. The compressor is typically of the rolling piston type. The refrigerant is a mixture of at least one cryogenic gas having a normal boiling point below 120 degrees K and at least two other gases having normal boiling point temperatures below 300 degrees K different from each other and from said one gas. There is also included means (18) for cooling the compressed refrigerant and for circulating the cooled refrigerant to the heat exchanger and its throttling orifice and then back to the compressor. The system does not require any cascaded heat exchangers or intermediate phase separators.
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公开(公告)号：EP0720719B1
公开(公告)日：2002-05-08
申请号：EP94929877.2
申请日：1994-09-23
申请人： APD CRYOGENICS INC.
CPC分类号： F25B9/14 , F25B23/006 , H01F6/04 , Y10S505/892
摘要： Apparatus and methods for cooling a superconducting magnet (11) by circulating a pressurized helium gas through a convective cooling loop (13) by natural convection, and for quickly and effectively cooling a warm superconducting magnet (11) down to operating temperature.
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公开(公告)号：EP0894226A4
公开(公告)日：2000-09-27
申请号：EP97917824
申请日：1997-04-02
申请人： APD CRYOGENICS INC
摘要： A precooled vapor-liquid refrigeration cycle includes a basic vapor-liquid cycle (24) and an auxiliary regenerative vapor-liquid cycle (26) having a heat exchange relationship (18') between them. The basic cycle (24) includes a compressor (10) connected in series with a condenser (12), throttle device (14), and evaporator (16). The auxiliary cycle (26) includes a compressor (10'), condenser (12'), throttle device (14'), and a counterflow heat exchanger (18'), successively connected. The cycles each have condensers (12, 12') that are cooled by ambient air; the basic cycle is able to operate independently of the auxiliary cycle. To maximize the coefficient of performance, the basic cycle (24) operates with a small pressure differential between compressor discharge (G) and return (f). Efficiency of the basic cycle and the system COP are improved. The refrigerant leaving the condenser (12') in auxiliary cycle (26) after passing through the auxiliary throttle device (14'), flows through the heat exchanger (18') in the counterflow arrangement with the very same refrigerant stream.
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9.发明公开CLOSED CYCLE CRYOGENIC REFRIGERATION SYSTEM WITH AUTOMATIC VARIABLE FLOW AREA THROTTLING DEVICE 失效配备闭路电视和自动流区域节流装置低温冷却器
公开(公告)号：EP0858576A4
公开(公告)日：1999-11-17
申请号：EP96923621
申请日：1996-07-02
申请人： APD CRYOGENICS INC
发明人： BOIARSKI MICHAEL , LONGSWORTH RALPH C , YUDIN BORIS , HILL DENNIS H , KLUSMIER LAWRENCE A , KHATRI AJAY N , OWOC ANTHONY L
CPC分类号： F17C3/085 , F17C2205/0326 , F17C2205/0329 , F17C2223/0161 , F17C2227/0353 , F17C2227/0355 , F17C2250/0631 , F17C2250/0636 , F25B9/02 , F25B41/062 , F25B2309/022 , F25B2400/12 , G05D23/022
摘要： An integral combination of expansion valve and evaporator in a cryostat using a single support member. The valve includes two flow orifices, one orifice (62) being used primarily for steady-state operation and the other orifice (44) being used only during cool-down. An actuator (28) having a high coefficient of thermal expansion moves a needle (46) positioned in the cool-down orifice (44) such that a large orifice flow area at the start of cool-down is automatically and continously reduced as the actuator (28) temperature decreases as refrigerant is throttled through the orifice. Within a range of approximately 30K from the desired steady-state evaporator temperature, the needle (46) completely blocks the cool-down orifice (44). Then, refrigerant flows through the steady-state orifice (62) which has a remotely adjustable needle (68). In the final stage of cool-down, the refrigerant system is entirely controlled by the steady-state orifice (62) and its associated needle (68).
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公开(公告)号：EP0892662A1
公开(公告)日：1999-01-27
申请号：EP97914932.0
申请日：1997-03-12
申请人： APD CRYOGENICS INC.
CPC分类号： F04B37/08 , B01D8/00 , F25B9/006 , Y10S417/901
摘要： A Group I gas cryopumping system includes a compressor throttle cycle refrigerator (10) using mixed refrigerants. Cold refrigerant flows through a cryopumping surface (44) located in a vacuum chamber, whereon vapor freezes. The refrigerant then passes through a heat exchanger (36) in cross flow with refrigerant from the compressor (18). Refrigerant flow entering and leaving the heat exchanger (36) is in uninsulated lines at substantially room temperature. All exposed cold lines are eliminated. The throttle device (42) and cold cryopumping surface (44) are an integral unit that connects directly to the flow paths of the heat exchanger (36) without intermediate lines. The compressor/aftercooler unit may be located at any convenient distance from the heat exchanger (36) and cryopumping surface (44), and the heat exchanger (36) is located immediately adjacent to the pumping surface (44) in a separate housing (46) outside the vacuum chamber (14).
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