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1. 发明专利

JPH04302955A CRYOGENIC FREEZER 失效
公开(公告)号：JPH04302955A
公开(公告)日：1992-10-26
申请号：JP6436091
申请日：1991-03-28
申请人： HITACHI LTD
发明人： MATSUMOTO KOZO , KAWAMURA SHIGETO
IPC分类号： F25B9/06 , F25B9/02 , F25B9/10
摘要： PURPOSE:To provide a maximum cooling state and pre-cooling capability of each of expansion turbines and improve an efficiency of transitive operation by a method wherein a branch line is branched from a connection line between a plurality of expansion turbines and the branch line is merged with a returning line at a substantial same temperature level. CONSTITUTION:A cryogenic freezer 10 has multi-stage heat exchangers 11a to 11e and a plurality of multi-stage expansion turbines 12a and 12b connected in series to each other. In this case, when a pre-cooling operation is carried out, a temperature at an inlet of a lower stage expansion turbine 12b is controlled by a flow merging valve 16 through a merging line branched from a primary side of an expansion turbine inlet valve 13 under an operating state of a cryogenic freezer (for example, an inlet temperature of a JT valve 14 and an inlet temperature decreasing speed). In addition, an inlet pressure at a lower stage expansion turbine 12b is controlled by the branch valve 15 through the branch line in such a way as a generated power determined by an inlet temperature and the expansion ratio may not exceed a braking capability of the braking means. Further, the inlet pressure of the upper stage expansion turbine 12a is also controlled in the same manner as above.

2. 发明专利

JPH03185881A METHOD AND APPARATUS FOR SUPPLYING CRYOGENIC LIQUID REFRIGERANT TO VEHICLE CARRYING SUPERCONDUCTING DEVICE 失效
公开(公告)号：JPH03185881A
公开(公告)日：1991-08-13
申请号：JP32395489
申请日：1989-12-15
申请人： HITACHI LTD
发明人： MATSUMOTO KOZO , KAWAMURA SHIGETO
IPC分类号： F25D17/00 , F25D3/10 , H01L39/04
摘要： PURPOSE:To reuse vaporized gas of a cryogenic liquid refrigerant without increasing weight or power consumption at all by a method wherein the second transfer line connected to the first transfer line as well as the second tank recovering and storing the vaporized gas through the intermediary of the first tank, the first and second transfer lines are provided on the ground side. CONSTITUTION:A vehicle side (b) feed line 8, a ground side (a) feed line 19 as well as a vehicle side feed back line 9, a ground side feed back line 20 are respectively connected and after opening an opening and closing valves 14A, 14B, 14D, 14E and feeding liquid helium 2 from a liquid helium tank 16 to an inner vessel 4 to be pre-cooled, the inner vessel 4 is filled up with the liquid helium 2 to immerse a superconducting magnet 3 therein. At this time, the helium gas produced inside the inner vessel 4 is fed back to a liquefaction refrigerator 17 to be stored in a liquid helium tank 16 for the liquefaction to be reused. Later, a linear motor car can be brought into the operational state by respectively cutting off the vehicle side feed line 8, the ground side feed line 19, the vehicle side feed back line 9 and the ground side feed back line 20.

3. 发明专利

JPH0325253A HELIUM REFRIGERATOR 失效
公开(公告)号：JPH0325253A
公开(公告)日：1991-02-04
申请号：JP15679089
申请日：1989-06-21
申请人： HITACHI LTD
发明人： KAWAMURA SHIGETO , MATSUMOTO KOZO
IPC分类号： F25B9/00
摘要： PURPOSE:To improve controllability of a heat shielding load and a cryogenic temperature line load by independently separating cold generating capacity of a heat shielding line from cold generating capacity of a cryogenic temperature line. CONSTITUTION:Helium gas compressed by a compressor 1 is introduced into a cold box 2, and cooled by a heat exchanger 3. Partial helium gas generates cold in an expansion unit 6, is combined with return gas, returned to the compressor 1, another partial helium gas is further cooled to cool a superconducting apparatus body 15 through a valve 7 and a cryogenic temperature line 11 of a low temperature transfer pipe 9, and again is returned to the box 2 through a cryogenic temperature line 12. On the other hand, the helium gas compressed by a compressor 21 in a shielding cooling system is introduced into a cold box 22, cooled by a heat exchanger 23 to cool a shielding line 4 of the pipe 9 and the shielding plate 14 of a superconducting apparatus 13 through a valve 27, and again returned to the box 22 through a shielding line 5. Thus, the control is stably facilitated.

4. 发明专利

JPH0272276A SAFETY VALVE 失效
公开(公告)号：JPH0272276A
公开(公告)日：1990-03-12
申请号：JP22236888
申请日：1988-09-07
申请人： HITACHI LTD , HITACHI TECHNO ENG
发明人： FUJIMORI KANJI , KAWAMURA SHIGETO , MATSUMOTO KOZO
IPC分类号： F16K17/04
摘要： PURPOSE:To improve workability in the time of testing at a pressure not less than a preset value by providing a line opening and closing means in a bypass line connecting a high pressure side to communicate with a low pressure side. CONSTITUTION:In the case of a safety valve, when a test is performed for pressure resistance and air-tightness, first a low pressure port 13 is closely sealed by a closing plate 10, and a flow of fluid is disconnected. Next, a plug 15 is opened, and a high pressure port 12 communicates with the low pressure port 13 by a bypass line 14. Next, a pressure is increased to the pressure for testing the pressure resistance and the air-tightness. By the method thus obtained, the safety valve eliminates a pressure difference between the high pressure port 12 and the low pressure port 13, and a valve unit 3 is prevented from generating lifting force by the differential pressure. Thus eliminating the necessity for pressing a valve rod 4 by a gag bolt 11 as in the past, workability in the time of testing can be improved by enabling damage or the like to be prevented by adjusting the pressing force of the valve unit 3 and by excessively pressing it.

5. 发明专利

JPH01150757A METHOD AND DEVICE FOR PRECOOLING CRYOGENIC REFRIGERATOR 失效
公开(公告)号：JPH01150757A
公开(公告)日：1989-06-13
申请号：JP30754187
申请日：1987-12-07
申请人： HITACHI LTD
发明人： KAJIWARA HIROTAKE , MATSUMOTO KOZO , KAWAMURA SHIGETO
IPC分类号： F25B9/02 , F25B9/00
摘要： PURPOSE: To shorten pre-cooling time by providing a line for supplying cool gas generated at the pre-cooling of a freezer to a Dewar flask so as to pre-cool the Dewar flask together with the freezer. CONSTITUTION: When a temperature around the outlet of a heat exchanger 17 of a high-pressure line 26 is reduced lower than that of the outlet of a heat exchanger 12, or the temperature in a Dewar flask 35 is reduced to that of the outlet of the heat exchanger 12, a valve 20 is closed and a JT valve 23 is opened, so that further cooled high-pressure gas is supplied to the Dewar flask 35 to pre-cool it to a lower temperature. When the freezer and the Dewar flask 35 are sufficiently pre-cooled, JT valves 23 and 24 and valve 22 are closed and JT valve 25 is opened so that high-pressure gas in the high-pressure line 26 is expanded at the JT valve 25 to be liquefied into liquid helium due to Joule-Thomson effect and the liquefied helium is transferred into the Dewar flask 5 by way of a liquefying line 27. Here, the pre-cooling time of the Dewar flask 35 can be reduced by supplying a cool gas to the Dewar flask 35 through a cool gas line 33 with a larger flow rate in addition to the liquefying line 27 with a small flow rate.

6. 发明专利

JPS6410252B2 失效
公开(公告)号：JPS6410252B2
公开(公告)日：1989-02-21
申请号：JP24140485
申请日：1985-10-30
申请人： HITACHI LTD
发明人： KAWAMURA SHIGETO , MATSUMOTO KOZO , KAJIWARA HIROTAKE
IPC分类号： F25J3/08 , B01D53/04 , F25B9/00 , F25B9/02
摘要： PURPOSE:To shorten regeneration time of an adsorber by sensing the temp. of a process line in a downstream of the adsorber and adjusting the divergence of a valve for changeover of the adsorber so that the sensed temp. is not exceeded over a specified allowable value. CONSTITUTION:Gaseous He compressed by a compressor 1 is heat-exchanged for liquid N2 in a heat exchanger 2, cooled and introduced to an adsorber 3 to adsorb and remove the impurities. A temp. measuring point 23 is provided to the downstream of the adsorber 3 and the downstream of a by-pass line. The divergence of the valves 7, 8, 9 is adjusted so that this temp. is not exceeded over an allowable value. The regeneration of the adsorber is performed by closing the valves 7, 8, opening the valve 9, utilizing the by-pass line, flowing gaseous He at ordinary temp. through a heating line 14, opening a valve 16, and decompressing the adsorber 3 by means of a vacuum pump 17.

7. 发明专利

JPS61223455A CRYOGENIC REFRIGERATOR AND OPERATION METHOD THEREOF 失效
公开(公告)号：JPS61223455A
公开(公告)日：1986-10-04
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

JPS5963463A Cryogenic refrigerator 失效
公开(公告)号：JPS5963463A
公开(公告)日：1984-04-11
申请号：JP17320682
申请日：1982-10-04
申请人： Hitachi Ltd
发明人： MATSUMOTO KOUZOU , KAWAMURA SHIGETO
IPC分类号： F25B9/00 , F04B37/08

9. 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).

10. 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.

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