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91. 发明专利

JPS5563371A METHOD OF CONTROLLING FLOW OF AIR INTAKE FOR AIR SEPARATOR 失效
公开(公告)号：JPS5563371A
公开(公告)日：1980-05-13
申请号：JP13682278
申请日：1978-11-08
申请人： HITACHI LTD
发明人： TASAKA YASUO , SASAKI KIYOSHI
IPC分类号： F25J3/04

92. 发明专利

JPS5440990A SWITCHING FREQUENCY ALTERNATION METHOD OF SWITCHING CONTROL CIRCUIT 失效
公开(公告)号：JPS5440990A
公开(公告)日：1979-03-31
申请号：JP10664577
申请日：1977-09-07
申请人： HITACHI LTD
发明人： TASAKA YASUO , SASAKI KIYOSHI
IPC分类号： G04F3/00 , G04C23/00 , G05B19/02 , G06F1/14
摘要： PURPOSE:To provide a switching frequency alternation with a reasonable cost by generating switching signal according to the preset value digitizing the pulse signal allowing the power signal from the program setting unit to convert to the pulse signal in a certain time interval with the analog digital converter. CONSTITUTION:The program setting unit 1 produces the power signal according to a certain preset power curve for example during 0-48 hours. The analog digital converter 2 converts to the pulse numbers in a certain time interval by entering the power of the program setting unit 1. The preset counter 3 produces the switching signal to restart from 0 when counting upto the preset numbers.

93. 发明专利

JPH06269625A OPERATION OF PRETREATMENT DEVICE OF AIR SEPARATOR 失效
公开(公告)号：JPH06269625A
公开(公告)日：1994-09-27
申请号：JP5842493
申请日：1993-03-18
申请人： HITACHI LTD
发明人： YANAGII TOSHIAKI , TASAKA YASUO , SOMEYA KAZUO
IPC分类号： B01D53/02 , B01D53/04 , F25J3/04 , F25J3/08
摘要： PURPOSE:To ensure that a separator body is operated stably by injecting a material air at a constant temperature into the air separator body of an adsorption pretreatment device. CONSTITUTION:A water tank 8 as a regenerator is provided between a separator body 6 and an adsorption tower 4. Thus a temperature change generating in each step of the adsorption tower is moderated by the regenerator. An adsorption heat is recovered in some case and released in the other case, so that it is possible to maintain the temperature of air to be blown into the separator body at a constant one.

94. 发明专利

JPH04121576A METHOD FOR CONTROLLING AIR SEPARATOR 失效
公开(公告)号：JPH04121576A
公开(公告)日：1992-04-22
申请号：JP23985390
申请日：1990-09-12
申请人： HITACHI LTD
发明人： SOMEYA KAZUO , TASAKA YASUO
IPC分类号： F25J3/04
摘要： PURPOSE:To get a high recovering rate of argon and perform a control of a stable operation by a method wherein a pressure of argon is detected as a temperature of a main condenser by an air separator for adjusting an amount of nitrogen in gas supplied to a crude argon column for taking argon from it in reference to a temperature difference between a middle part of an upper rectifying column and a main condenser, its saturation temperature is calculated and controlled. CONSTITUTION:As a temperature of a middle part of an upper rectifying column is detected, a temperature at a point B is detected. A temperature of a main condenser is calculated by detecting a pressure at a point A. This temperature difference is set in such a way as a concentration of argon in a feeding gas is kept as high as possible and an amount of included nitrogen is less than its allowable limit value. If the temperature difference is set to 10 deg.C, for example, and an operation for decreasing an amount is changed to an operation for increasing the amount, a pressure at a main condenser of the upper rectifying column is increased. If this value is increased from 1.4kg/cm abs to 1.6kg/cm abs, the temperature of the main condenser is varied in its saturation temperature from -180 deg.C to -178.6 deg.C, so that the temperature controlled value at the middle part has a constant temperature difference, resulting in that it is varied from -190 deg.C to -188.6 deg.C. With such an arrangement, it is possible to increase a feed gas composition and to perform a high recovering and stable operation for argon.

95. 发明专利

JPH03148701A CONTROL METHOD FOR FLOW SWITCHING VALVE 失效
公开(公告)号：JPH03148701A
公开(公告)日：1991-06-25
申请号：JP28747389
申请日：1989-11-06
申请人： HITACHI LTD
发明人： YANAGII TOSHIAKI , TASAKA YASUO
IPC分类号： G05B7/02 , G05D7/00
摘要： PURPOSE:To eliminate switching shock and to prevent pressure fluctuation by gradually decreasing an output amount to one flow control valve together with the passage of time after switching time and adding the decreased part to the output amount of the other flow control valve. CONSTITUTION:When an adsorption tower goes into the latter half of a reproducing process, the target value of a uniform response is changed over to 0% side. The flow of reproducing gas is converted to an electric signal by a transmitter 11 and an operation output amount to a valve is determined by a flow controller 2. A flow control valve A6 becomes a LOW selector for the output of the equal velocity response and the output determined by the flow controller 2 and since this values is gradually decreased together with the passage of time, the flow control valve A6 is gradually closed. On the other hand, since a flow control valve B7 defines a value, for which only an output part to the flow control valve A6 is subtracted from the output determined by the flow controller 2, as a valve opening degree, the flow control valve B7 is opened only for the closed part of the flow control valve A6. Thus, since flow switching is smoothly executed while fixing flow, the pressure of a reproducing gas line can be prevented from being fluctuated.

96. 发明专利

JPH01296077A CONTROL OF PRETREATMENT DEVICE FOR AIR SEPARATOR 失效
公开(公告)号：JPH01296077A
公开(公告)日：1989-11-29
申请号：JP12576288
申请日：1988-05-25
申请人： HITACHI LTD
发明人： YANAGII TOSHIAKI , TASAKA YASUO , KIBUNE KAZUTAKA
IPC分类号： B01D53/04 , F25J3/04
摘要： PURPOSE:To permit the control of the opening degree of a pressurizing valve through a low-speed computer, by a method wherein the complicated operation of the opening degree of the pressurizing valve is effected by a high-class computer while the result thereof is proximated to an one-dimensional function per unit time to operate it by the low-speed computer. CONSTITUTION:In a pretreatment device of an air separator, in which two or more of adsorption towers are used by switching, a time after starting a pressurizing process is employed as a variable and the opening degree of the pressurizing valve, through which the volume of pressurizing air becomes a constant, is plotted by a high-class computer while one dimensional proximated formulas are produced in respective times such as curves 2, 3, 4, 5, 6 utilizing a curve 1. According to this method, the opening degree of the pressurizing valve 9 is indicated by one-dimensional functions of only a time whereby the opening degree of the pressurizing valve 9 may be controlled by following the operating speed of the low-speed computer 7.

97. 发明专利

JPH0148476B2 失效
公开(公告)号：JPH0148476B2
公开(公告)日：1989-10-19
申请号：JP16811883
申请日：1983-09-14
申请人： HITACHI LTD
发明人： SOMEYA KAZUO , TASAKA YASUO
IPC分类号： F25B9/10 , F25J1/02

98. 发明专利

JPH0132434B2 失效
公开(公告)号：JPH0132434B2
公开(公告)日：1989-06-30
申请号：JP17719781
申请日：1981-11-06
申请人： HITACHI LTD
发明人： YAMAZAKI MASAHIRO , TASAKA YASUO
IPC分类号： F25J3/04

99. 发明专利

JPS63223480A METHOD OF CONTROLLING QUANTITY OF RAW MATERIAL GAS OF GAS SEPARATOR 失效
公开(公告)号：JPS63223480A
公开(公告)日：1988-09-16
申请号：JP5402387
申请日：1987-03-11
申请人： HITACHI LTD
发明人： YAMAZAKI MASAHIRO , TASAKA YASUO , KOYAMA SHOJI
IPC分类号： F25J3/04

100. 发明专利

JPS6329199B2 失效
公开(公告)号：JPS6329199B2
公开(公告)日：1988-06-13
申请号：JP17291983
申请日：1983-09-21
申请人： HITACHI LTD
发明人： TASAKA YASUO , MASUDA SADAO , SASAKI KYOSHI
IPC分类号： F28F27/02 , G05D23/19

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