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41. 发明专利

JPH04155175A CONTROLLING METHOD FOR AIR OUTLET TEMPERATURE IN AIR COOLER FOR AIR SEPARATOR 失效
公开(公告)号：JPH04155175A
公开(公告)日：1992-05-28
申请号：JP27632890
申请日：1990-10-17
申请人： HITACHI LTD
发明人： OKABE MICHIMASA , TASAKA YASUO
IPC分类号： B01D53/04 , F25J3/04 , F25J3/08
摘要： PURPOSE:To permit the stabilization and automatic control of the air outlet temperature of an air cooler by a method wherein the range of limit is determined in the outlet temperature of fluorocarbon based on the air outlet temperature of the air cooler to set the set value of a fluorocarbon outlet temperature regulating meter automatically. CONSTITUTION:The air outlet pipe of an air cooler 4 is provided with a temperature regulating meter 36 while the set value of a lower limit temperature, higher than an evaporation saturation temperature, and an upper limit temperature of evaporation saturation temperature +10 deg.C are provided in the set values of a temperature regulating meter 33 attached to the outlet pipe 23 of fluorocarbon. When there is no condensation of oil, an air outlet temperature becomes lower than an object by 5 deg.C or more and the set value of a fluorocarbon outlet temperature regulating meter 33 is increased by a temperature regulating meter 36 to the temperature of saturating temperature +10 deg.C in accordance with a difference of the consentration of outlet air while the outlet air is sucked into a fluorocarbon compressor 25 as perfect heating vapor and the compressor is operated under the best condition. When the load of the refrigerant is fluctuated and the condensation of oil is generated in the air cooler 4, the air outlet temperature is increased by 5 deg.C or more than an objective value. The set value of the fluorocarbon outlet temperature regulating meter 33 is set lower than the set value of an air outlet temperature regulating meter 36 automatically Whereby oil in the tube of the cooler 4 is contained in the mist of fluorocarbon liquid and is accompanied to return a normal condition.

42. 发明专利

JPH04121577A METHOD FOR CONTROLLING AIR SEPARATOR 失效
公开(公告)号：JPH04121577A
公开(公告)日：1992-04-22
申请号：JP23985590
申请日：1990-09-12
申请人： HITACHI LTD
发明人： NUNOMURA MASAYOSHI , TASAKA YASUO
IPC分类号： F25J3/04 , F25J3/08
摘要： PURPOSE:To keep a specified amount of supplied air and perform a stable operation by a method wherein when moisture content and carbonic acid gas in air are removed with adsorbing agent as a pre-processing for separation of air form which argon is removed, a capacity control for a raw material air compressor is carried out by a flow meter placed at an outlet port of an adsorption column. CONSTITUTION:When an adsorption column 2A is in its adsorption process, an adsorption column 2B is in its regenerating process, an amount of air of a raw material air compressor 1 becomes only an amount of air required for a low-temperature processing, a capacity control valve 4 for the compressor is controlled by a flow meter 6 at an outlet port of the adsorption column and then the air is supplied to a low-temperature processing part 3. Upon completion of the adsorption process, the column 2A starts its regenerating process with an adsorption column changing-over control valve 5. Upon completion of the regenerating process, the column 2A is pressurized up to a raw material air pressure and at this time an amount of air in the compressor 1 becomes an amount of air required for performing the low-temperature processing and also a pressurized air volume. However, an amount of air for the low-temperature processing is controlled to be constant. At the air separator for taking argon, a remarkable influence of varied amount of air is attained and so the present controlling method shows a higher effect.

43. 发明专利

JPH02147833A METHOD FOR DISCRIMINATING OUTPUT OF PURITY METER 失效
公开(公告)号：JPH02147833A
公开(公告)日：1990-06-06
申请号：JP30051088
申请日：1988-11-30
申请人： HITACHI LTD
发明人： YANAGII TOSHIAKI , TASAKA YASUO , KIBUNE KAZUTAKA
IPC分类号： G01N1/00 , F25J1/00 , F25J3/00
摘要： PURPOSE:To send a product gas in a fully automated state by deciding the timing at which the main valve of such a meter which requires time for substitution as a purity meter from the time elapsed from the pressure of a condenser is dropped. CONSTITUTION:When the pressure in a condenser starts to drop and rectification is started, the purity of N2 gas gradually gets higher. Accordingly, a timer which does not open a solenoid valve for a fixed period of time after the pressure in the condenser drops is used. Since the timer inhibits the opening of the solenoid valve for a fixed period of time after the rectification is started, namely, until the purity becomes higher to a certain level, the inside of a purity meter is not contaminated with a low-purity N2 gas. In addition, another timer which makes the output of the purity meter invalid during a fixed period of time after the solenoid valve is opened is also used. Because of the timer, wrong indication of the purity meter caused by insufficient substitution in the purity meter can be prevented.

44. 发明专利

JPH0211833B2 失效
公开(公告)号：JPH0211833B2
公开(公告)日：1990-03-15
申请号：JP26104085
申请日：1985-11-22
申请人： HITACHI LTD
发明人： TASAKA YASUO , SASAKI KYOSHI , SATONO TADASHI
IPC分类号： B01D3/42 , F25J3/04
摘要： This invention makes an optimal control of an air separator for any set value of a product quantity by inputting a necessary product quantity, calculating a minimum necessary raw air quantity by use of the capacity of the air separator and its operating condition and using this quantity as a set value for a raw air quantity adjustment loop.

45. 发明专利

JPS6355634B2 失效
公开(公告)号：JPS6355634B2
公开(公告)日：1988-11-02
申请号：JP6533682
申请日：1982-04-21
申请人： HITACHI LTD
发明人： TASAKA YASUO , SOMEYA KAZUO
IPC分类号： F25J3/08 , B01D53/04

46. 发明专利

JPS62238977A METHOD OF CONTROLLING AIR SEPARATOR 失效
公开(公告)号：JPS62238977A
公开(公告)日：1987-10-19
申请号：JP8204286
申请日：1986-04-11
申请人： HITACHI LTD
发明人： TASAKA YASUO , SASAKI KIYOSHI , SATONO TADASHI
IPC分类号： F25J3/04 , F25J3/02

47. 发明专利

JPS622845B2 失效
公开(公告)号：JPS622845B2
公开(公告)日：1987-01-22
申请号：JP9766482
申请日：1982-06-09
申请人： HITACHI LTD
发明人： SOMEYA KAZUO , TASAKA YASUO
IPC分类号： F25J3/08 , B01D53/04

48. 发明专利

JPS61281922A LIQUID LEVEL MEASURING DEVICE FOR LIQUID AIR IN RECTIFYING COLUMN 失效
公开(公告)号：JPS61281922A
公开(公告)日：1986-12-12
申请号：JP12240785
申请日：1985-06-07
申请人： HITACHI LTD
发明人： OKABE MICHIMASA , TASAKA YASUO , NUNOMURA MASAYOSHI
IPC分类号： F25J3/04 , G01F23/14 , G01F23/16
摘要： PURPOSE:To stably measure the liquid level of liquid air by gasifying the liquid nitrogen rectified in the upper part of a rectifying column in the state of exerting a liquid head thereto. CONSTITUTION:Feed air is blown through a conduit 1 into the gas zone in the lower part of the rectifying column 2 and as the air ascends in the column 2, the air is rectified and is gradually enriched with nitrogen. This air is condensed in a condenser 3 and descends downward in the form of a reflux liquid. The reflux liquid is rectified by contacting with the ascending gas and the liquid air gradually enriched with oxygen is stored in the bottom of the column 2. The liquid air stored in the lower part of the rectifying column is withdrawn therefrom by a conduit 8 and is supplied to the condenser 3. The liquid level of the liquid air in the lower part of the rectifying column is measured by a differential pressure type transmitter 6 which measures the high pressure side gas gasified, by the external heat, from the liquid air derived from a pressure conduit pipe 4 by a high pressure side instrumentation pressure conduit pipe 4 and a low pressure side instrumentation pressure conduit pipe 5 and the gas derived from a pressure conduit pipe 5 and measures the liquid level of the liquid air in the lower part of the rectifying column by such differential pressure.

49. 发明专利

JPS6155035B2 失效
公开(公告)号：JPS6155035B2
公开(公告)日：1986-11-26
申请号：JP15066080
申请日：1980-10-29
申请人： HITACHI LTD
发明人： OKABE MICHIMASA , TASAKA YASUO
IPC分类号： F25J3/04

50. 发明专利

JPS61241801A CONTROLLER FOR FLUID TEMPERATURE 失效
公开(公告)号：JPS61241801A
公开(公告)日：1986-10-28
申请号：JP8230585
申请日：1985-04-19
申请人： HITACHI LTD
发明人： SATONO TADASHI , TASAKA YASUO
IPC分类号： G05B9/02 , G05D11/16 , G05D23/13 , G05D23/19
摘要： PURPOSE:To prevent the abnormal overheat of a heater by using a flow rate lower limit actuator to stop the actuation of the heater when the feed amount of the fluid is less than the prescribed level to the heater. CONSTITUTION:A flow rate lower limit actuator 3 breaks a power supply 4 when the amount of the fluid supplied to a heater 6 is less than the prescribed level and stops the actuation of the heater 6. In this example the amount of the fluid supplied to the heater 6 is obtained indirectly from the control signal of a program temperature controller 1. In other words, the actuator 3 compares the lower limit amount of the fluid set previously with the amount of the fluid obtained from said control signal and supplied to the heater 6. Then the actuator 3 breaks the power supply 4 when the amount of the fluid supplied to the heater 6 is less than the lower limit amount of the fluid and then controls a control valve 5 for change of the output ratio between the amount of the fluid supplied to the heater 6 and that supplied to a cooler 7. This prevents the abnormal overheat owing to the reduction of the amount of the fluid supplied to the heater 6.

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