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1. 发明专利

JP2000171111A CRYOGENIC COOLING SYSTEM 失效
公开(公告)号：JP2000171111A
公开(公告)日：2000-06-23
申请号：JP34513398
申请日：1998-12-04
申请人： HITACHI LTD
发明人： MATSUMOTO KOZO
IPC分类号： F25D3/10 , F25B9/00
摘要： PROBLEM TO BE SOLVED: To permit efficient and stabilized operation by a method wherein a cryogenic cooling system is provided with a gas-liquid separator, effecting the gas-liquid separation of cryogenic refrigerant, discharged out of a body to be cooled, and a supplying valve, regulating the supplying amount of a cryogenic refrigerant supplying line, to suck and join the liquid refrigerant, separated in the gas-liquid separator through gas-liquid separation, into the secondary side of the supplying valve. SOLUTION: Liquid nitrogen, supplied from a liquid nitrogen source, receives invasion heat in a supplying line 10 and a part of the same is gasified to introduce the same into a heat exchanger 7 in a gas-liquid separator 2 and cool the same through heat exchange and, thereafter, is introduced into an ejector 4 through a supplying valve 3. Then, liquid nitrogen in the gas-liquid separator 2 is sucked and joined into the part of liquid nitrogen to supply them to a body 1 to be cooled and introduce them into the gas-liquid separator 2 under gas-liquid two phase condition after absorbing the thermal load of the body 1 to be cooled. In this case, gas in the gas-liquid separator 2 is released to the outside of a building through a releasing line 11 while liquid is introduced into the ejector 4 through a recovering valve 5. According to this method, the liquid nitrogen, separated in the gas-liquid separator 2 through gas-liquid separation, can be supplied again into the body 1 to be cooled whereby stabilized operation is permitted.

2. 发明专利

JPH06241654A APPARATUS OF HELIUM REFINING 失效
公开(公告)号：JPH06241654A
公开(公告)日：1994-09-02
申请号：JP3009993
申请日：1993-02-19
申请人： HITACHI LTD
发明人： MATSUMOTO KOZO , YOSHIDA JUN
IPC分类号： F25B9/02 , F25J1/00 , F25J3/06 , F25J3/08
摘要： PURPOSE:To simplify a line construction and also to make an apparatus compact by a method wherein impurities such as water and carbon dioxide of which the solidification temperature is high relatively are removed by an auxiliary refiner. CONSTITUTION:Impure helium is introduced into an auxiliary refiner 21 through an impure helium supply line 20 and impurities such as water and carbon dioxide which are solidified until a level of 80K are removed by the auxiliary refiner 21. The impure helium coming out of the auxiliary refiner 21 is introduced into a cold box 10 and it is cooled down to about 80K by a first main heat exchanger 11a and introduced into a vapor-liquid separator 25. An impure helium gas coming out of the vapor-liquid separator 25 is introduced into an impure gas condensing heat exchanger 27 and the impure gas liquefied in the impure gas condensing heat exchanger 27 flows down under the gravity into the vapor- liquid separator 25. Refined helium obtained by further cooling and refining in the impure gas condensing heat exchanger 27 joins with a liquefied line coming out of a second main heat exchanger 11b. A liquefied impure gas stored in the vapor-liquid separator 25 is introduced into the first main heat exchanger 11a and collected with the cold.

3. 发明专利

JPH065143B2 失效
公开(公告)号：JPH065143B2
公开(公告)日：1994-01-19
申请号：JP20160784
申请日：1984-09-28
申请人： HITACHI LTD
发明人： MATSUMOTO KOZO , MURAKAMI SEI , KAJIWARA HIROTAKE
IPC分类号： F25B9/02

4. 发明专利

JPH0579716A VERY-LOW TEMPERATURE REFRIGERATOR USING AUXILIARY COLD SOURCE 失效
公开(公告)号：JPH0579716A
公开(公告)日：1993-03-30
申请号：JP24090891
申请日：1991-09-20
申请人： HITACHI LTD
发明人： MATSUMOTO KOZO , KAWAMURA SHIGETO
IPC分类号： F25B9/02
摘要： PURPOSE:To control so as not to give an excessive variation in temperature to an auxiliary cold source heat exchanger by adopting, a process in which the temperature of main refrigerant low pressure helium that is introduced into the auxiliary cold source heat exchanger is set higher than the saturation temperature of the auxiliary cold source. CONSTITUTION:The medium pressure helium that is compressed by a helium compressor 1 is supplied to a helium refrigerator 10 and it is cooled by a gas nitrogen heat exchanger 11, and, further, it is cooled down to about 90 K by a liquid nitrogen heat exchanger 12 and is supplied to a third heat exchanger 13 at temperature lower than the temperature level of liquid nitrogen. The volume of the supplied liquid nitrogen is controlled by a liquid nitrogen supply valve 43 through a controller 44 so as to hold the temperature at the outlet of the medium pressure helium of the liquid nitrogen heat exchanger 12 at about 90 K. And, during the operation that is not steady, for example, at the time of starting because of the introduction of a large volume liquid nitrogen initially which gives a sudden temperature change to the liquid nitrogen heat exchanger 12 it is effective to change the set temperature for the medium pressure helium with time (for instance, lower the temperature at 60 K/h).

5. 发明专利

JPH04369395A LAMINATION TYPE HEAT EXCHANGER 失效
公开(公告)号：JPH04369395A
公开(公告)日：1992-12-22
申请号：JP14710091
申请日：1991-06-19
申请人： HITACHI LTD
发明人： UEDA HIRONOBU , HARADA SUSUMU , MATSUMOTO KOZO
IPC分类号： F28D9/00 , F28F3/08
摘要： PURPOSE:To provide a lamination type heat exchanger suitable for use in an extremely low temp. generator such as helium liquifying refrigerating machine and effective in reduction into a compact form, improvement of operational efficiency, prevention of lowering in heat exchanging performance and improvement of reliability at the time of attachment. CONSTITUTION:A laminate receiving container 5 has therein a plurality of laminate supporting rods 5b' and an air-tight cylindrical container 5b and a heat stress relieving bellows 5c welded to a header 5a. In this container 5, heat transfer plates 1 and spacers 2 are stacked alternately to form a laminated structure in contact with the supporting rods therein. After mounting a header 6 at the top part of the container 5, the header is connected thereto by a flange 5d with each end attached to the corresponding position and the header and the container are joined air-tight by the flange structure (permitting use of sealing matter e.g. metal packing).

6. 发明专利

JPH0498052A CRYOGENIC COOLING DEVICE 失效
公开(公告)号：JPH0498052A
公开(公告)日：1992-03-30
申请号：JP21443590
申请日：1990-08-15
申请人： HITACHI LTD
发明人： KAWAMURA SHIGETO , MATSUMOTO KOZO
IPC分类号： F25B9/00
摘要： PURPOSE:To restrict an increasing in temperature at a cryogenic low temperature and realize an efficient recooling by a method wherein a cooling of thermal shield can be changed over to a cooling with helium acting as the same king of first refrigerant as a cryogenic refrigerant and another cooling with liquid nitrogen acting as the second refrigerant having a higher boiling point differing from that of the first refrigerant. CONSTITUTION:Helium gas compressed by a low-stage compressor 1 and a high-stage compressor 2 is processed by an oil separation device 3 to separate oil substance, enters a cold box 5 and then the oil substance is returned to a heat exchanger 6 and heat exchanged with helium gas and cooled. However, when a freezer is troubled in its operation, and stopped, a valve 39 is closed, supplying of cryogenic cooling medium is stopped and at the same time supplying of cryogenci helium gas to a thermal shield 20 must be stopped. In this case, valves 37 and 38 are closed, valves 54 and 55 are opened and liquid nitrogen is supplied from a liquid nitrogen storing tank 51 to the thermal shield 20 through a cryogenic transmitting pipe 52. Liquid nitrogen heated by the thermal shield 20 becomes partially gaseous nitrogen, and is discharged into the atmospheric air through the cryogenic transmitting pipe 53. With such an arrangement, an increasing in temperature at the cryogenic part is reduced and the time of recooling can be shortened and an efficient operation of the cryogenic cooling system can be performed.

7. 发明专利

JPH04189B2 失效
公开(公告)号：JPH04189B2
公开(公告)日：1992-01-06
申请号：JP6062085
申请日：1985-03-27
申请人： HITACHI LTD
发明人： MATSUMOTO KOZO , KAJIWARA HIROTAKE , KAWAMURA SHIGETO
IPC分类号： F25B9/02

8. 发明专利

JPH03267659A HELIUM FREEZER 失效
公开(公告)号：JPH03267659A
公开(公告)日：1991-11-28
申请号：JP6419790
申请日：1990-03-16
申请人： HITACHI LTD
发明人： KAWAMURA SHIGETO , MATSUMOTO KOZO
IPC分类号： F25B9/00
摘要： PURPOSE:To keep an inside absorber at a liquid nitrogen temperature to procure efficient regeneration by a method wherein liquid nitrogen which works as auxiliary cold is made to flow through a coil wound in the inside absorber and is led into a heat exchanger having a temperature higher than the liquid nitrogen temperature level, and at the time of heating for regeneration, gaseous nitrogen is made to flow through the coil. CONSTITUTION:During cooling operation, liquid nitrogen which works as auxiliary cold enters a cold box 2 and then flows through a coil 13 in an inside absorber 4 to make the temperature of helium gas flowing through the inside absorber 4 come up to a liquid nitrogen temperature level more completely. At the time of heating an object to be cooled, for example, a magnet, valves 34 and 33 are adjusted, helium gases of the liquid nitrogen temperature level and of a normal temperature are mixed and the mixture is supplied to the magnet, while the liquid nitrogen is made to flow through the coil 13 in the inside absorber 4, whereby a relatively small amount of helium gas flowing through the inside absorber 4 can be kept at the liquid nitrogen temperature level.

9. 发明专利

JPH03239898A ULTRA-LOW TEMPERATURE REFRIGERANT CARRYING DEVICE 失效
公开(公告)号：JPH03239898A
公开(公告)日：1991-10-25
申请号：JP3155390
申请日：1990-02-14
申请人： HITACHI LTD
发明人： KAWAMURA SHIGETO , MORITA SHOJI , MATSUMOTO KOZO
IPC分类号： F17C3/04 , F17C6/00 , F17C13/00
摘要： PURPOSE:To shorten extracting part and facilitate operation and handling by providing a vacuum heat insulating tube in an ultra-low temperature change-gas storage tank, making an inner pipe part in which an ultra-low temperature liquefied gas directly flows separable and connectable. CONSTITUTION:The space between an outer pipe 1 and an inner pipe 2 in which LH2 flows forms a vacuum heat insulating layer 3, and they are connected to a Dewar vessel through an insert 4 and to a cryostat in which LH2 is used through an insert part 5. LH2 is carried from the Dewar vessel to the cryostat. The Dewar vessel has the vacuum heat insulating layer 3 between its outer tank 11 and inner tank 12 and a liquid extracting part formed into a long neck, and the temperature of the Dewar vessel upper part is close to a room temperature, and the lower side of the Dewar vessel neck part is close to a ultra-low temperature. The vacuum heat insulating part of the Dewar vessel side insert part of TRT is divided, and a vacuum heat insulating tube 6 is inserted to the Dewar vessel. The insert part 4 has a length similar to that of a general bayonet, and the inner pipe 2 can be separated from and connected to a liquid extracting inner pipe 2 through a connecting part 8.

10. 发明专利

JPH0350954B2 失效
公开(公告)号：JPH0350954B2
公开(公告)日：1991-08-05
申请号：JP22860585
申请日：1985-10-16
申请人： HITACHI LTD
发明人： MATSUMOTO KOZO , KAJIWARA HIROTAKE
IPC分类号： F25B9/06 , F25B9/00

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