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1. 发明专利

JPH0820136B2 失效
公开(公告)号：JPH0820136B2
公开(公告)日：1996-03-04
申请号：JP1390490
申请日：1990-01-24
申请人： HITACHI LTD
发明人： YOSHIKAWA TOMIO , YAMASHITA TETSUHARU , MURAKAMI KYOSHIRO , KATO TAKASHI , YASUDA HIROSHI , ZUSHI SHIZUO
IPC分类号： F25B1/00 , F25B49/02 , F25D17/02 , G05D23/19
摘要： A water chilling apparatus comprising a plurality of chilling modules each having a refrigerating cycle mainly composed of a compressor, a condensor, an evaporator and an expansion mechanism, and a control module having a water pump for feeding, to an object to be chilled, chilling water cooled down by the evaporator of each chilling module, a detector for detecting a temperature of the chilling water and a water temperature controller. A chilling ability of each chilling module in response to a variable frequency is kept at substantially the same level. A capacity of the compressor of each chilling module is variably controlled in a range between an upper limit capacity and a lower limit capacity. The water temperature controller is used to calculate a whole necessary capacity value needed in the compressors of all the chilling modules as a function as a deviation between a set value of the chilling water temperature and a chilling water temperature detected by the detector. The number of the operated chilling modules is controlled in response to the whole necessary capacity value and the upper and lower capacities of each of the chilling modules. The capacity of the compressor of each of the cooling modules is controlled so as to have a capacity value obtained by equally distributing the calculated whole necessary capacity value by the number of the operated chilling modules.

2. 发明专利

JPH02275275A FLUID TEMPERATURE CONTROL SYSTEM AND COMPUTER SYSTEM USING THE SAME 失效
公开(公告)号：JPH02275275A
公开(公告)日：1990-11-09
申请号：JP9513889
申请日：1989-04-17
申请人： HITACHI LTD
发明人： YASUDA HIROSHI , OGURO TAKAHIRO , TAKAHASHI KENJI , ZUSHI SHIZUO , YAMASHITA TETSUHARU , YOSHIKAWA TOMIO , MURAKAMI KYOSHIRO
IPC分类号： F25D17/02 , F25D13/00 , G05D23/00 , G05D23/19 , G06F1/00 , G06F1/20 , G11B33/14
摘要： PURPOSE:To control accurately a temp. condition to operate stably LSI chips by a method wherein the mean temp. of a fluid is measured after a liquid circulation pump is operated and on the basis of the comparison result between a set and measured temp. the operation start time of LSI chips and the operation start time of a refrigerator are controlled and the refrigerating capacity of a refrigerator can be varied in no step. CONSTITUTION:When a system is started to operate, a command to operate a pump is transmitted through a signal line 4a and a pump 4 is started, and a fluid is circulated through a flow passage 3a at an exothermic part 1 side and a flow passage 3b at an endothermic part 5 side as shown by arrows. Then, a fluid temp. is measured by a sensor 7. Next, after it is confirmed whether the refrigerator 6 is operated or not and a set temp. and the measured temp. are compared, the operation of the refrigerator is started to operate by the command to start the operation of the refrigerator or the operation signal for LSI chips is delivered. By the above-mentioned system starting, a fluid temp. can be quickly reached to the set temp. Afterwards, in order to keep the fluid temp. at the set temp., PID control is carried out by a refrigerator 6, the refrigerating capacity of which is variable, on the basis of the fluid temp. measured at the set time intervals.

3. 发明专利

JPH046350A WATER COOLING DEVICE 失效
公开(公告)号：JPH046350A
公开(公告)日：1992-01-10
申请号：JP10760590
申请日：1990-04-25
申请人： HITACHI LTD
发明人： YOSHIKAWA TOMIO , YAMASHITA TETSUHARU , MURAKAMI KYOSHIRO , YASUDA HIROSHI , ZUSHI SHIZUO
IPC分类号： F25B1/00
摘要： PURPOSE:To avoid an operation at a high frequency by a method wherein an overlapping range of cooling capacities of two or more modules is set by an output frequency range of a capacity controller, and the shift from N-1 module operation to N module operation is decided according to the stability of the water temperature. CONSTITUTION:Cooled water is circulated by a pump 5 through a body 4 to be cooled, and the water temperature is detected by a water temperature sensor 6. A control module 1 calculates frequencies to be given to cooling modules 2 and 3 according to the difference between the detected water temperature and the set temperature. The cooling module 2 consists of a compressor 8, a condenser 9, and expansion valve 10, and an evaporator 7 where heat- exchanging takes place to cool water. The module 3 has the same constitution as the module 2. The capacity range for a cooling module is set between a Hz and b Hz and the relation of a Hz to b Hz is 2b Hz a

4. 发明专利

JPH03102153A TEMPERATURE CONTROL METHOD FOR COOLING DEVICE 失效
公开(公告)号：JPH03102153A
公开(公告)日：1991-04-26
申请号：JP23999789
申请日：1989-09-18
申请人： HITACHI LTD
发明人： MURAKAMI KYOSHIRO , YAMASHITA TETSUHARU , YOSHIKAWA TOMIO , YASUDA HIROSHI , ZUSHI SHIZUO
IPC分类号： F25D9/00 , F25D1/02 , F28F27/02 , G05D23/20
摘要： PURPOSE:To perform stable control of the temperature of fluid throughout a wide range of the temperature or a flow rate of cooling water and even when a fluctuation in temperature or a flow rate is produced by a method wherein a difference between a cooling water temperature and a fluid temperature is detected, and according to the temperature difference, sensitivity of a flow rate regulating valve is set. CONSTITUTION:By regulating a flow rate F on the fluid side of a heat exchanger 1 is regulated by a three-way valve 2, a fluid temperature T2 is controlled. A control circuit 4, to which a temperature sensor 7a to detect the fluid temperature T2 and a temperature sensor 7b to detect a temperature t1 of cooling water are connected, comprises a comparing circuit 4a to calculate a deviation T between the set fluid temperature T0 and the fluid temperature T2, a comparing circuit 4b to calculate a temperature difference at between the fluid temperature T2 and the temperature t1 of cooling water, a computing circuit 4c to compute a given valve opening V responding to the temperature difference T between the set fluid temperature T0 and the fluid temperature T2 and a temperature difference t between the fluid temperature T2 and the temperature t1 of cooling water, and a converting circuit 4d to output a computing result to an electric motor 3. Stable control of temperature is provided throughout a wide range of the cooling water temperature t1, and stable control of temperature is also provided in relation to a fluctuation in the temperature t1 of cooling water.

5. 发明专利

JPH0249458A COOLING WATER SUPPLY DEVICE FOR LSI 失效
公开(公告)号：JPH0249458A
公开(公告)日：1990-02-19
申请号：JP20061888
申请日：1988-08-11
申请人： HITACHI LTD
发明人： TAKAHASHI KENJI , TORII TAKUJI , KOKUNI KENSAKU , YAMASHITA TETSUHARU , MURAKAMI KYOSHIRO , ZUSHI SHIZUO
IPC分类号： F25B1/00 , F01C21/00 , F04C23/00 , F04C29/04 , G06F1/20 , H01L23/473
摘要： PURPOSE:To reduce the space that cooling water supply devices occupy by a method wherein cooling water supply devices are stacked up one upon the other and condensers are arranged on the side of a cooling water supply device. CONSTITUTION:In a cooling water supply system, provided with compressors 4, evaporators 3, and condensers 2 and designed for use with an LSI, cooling water supply devices are stacked up one upon the other. The cooling water supply device is provided with the condensers 2 on its side. Air is introduced into the cooling water supply device by blowers 5 in operation. The air is led, again by the blowers 5, into a duct-shaped path 6 through the intermediary of the condensers 2 arranged on the side nearer to the duct vacancy. Using this design, the space may be reduced that is occupied by cooling water supply devices.

6. 发明专利

JPH05143169A START CONTROLLING METHOD FOR WATER COOLING DEVICE 失效
公开(公告)号：JPH05143169A
公开(公告)日：1993-06-11
申请号：JP30751791
申请日：1991-11-22
申请人： HITACHI LTD
发明人： UEDA HIROYUKI , YOSHIKAWA TOMIO , SASADA TAKESHI , KOMAKI MASAHIKO , MITSUI KATSUJI , YAMASHITA TETSUHARU , MURAKAMI KYOSHIRO
IPC分类号： F28F27/00 , G05D23/00
摘要： PURPOSE:To prevent the generation of dew condensation on a cooled body at the time of starting a water cooling device without using a dew condensation preventing additional device such as a heater. CONSTITUTION:When the temperature of cooling water is less than a prescribed value in a closed loop consisting of a water/water heat exchanger 1, a mixing three-way valve 2, a cooled body 3, a pump 4, and a by-pass 5 for the heat exchange, the flow rate of the by-pass 5 is increased, the inflow of water into the heat exchanger 1 is restricted for a prescribed time to suppress the temperature drop of cooling water in the closed loop and prevent the generation of dew condensation on the cooled body 3, and when the temperature of the cooling water reaches a prescribed temperature range, water temperature control for a normal state is started. Even when water temperature of the closed loop is low, the temperature drop of the cooling water in the heat exchanger 1 at the time of starting the water cooling device can be suppressed to its minimum and the generation of dew condensation on the cooled body 3 can be prevented.

7. 发明专利

JPH0444351A COOLER FOR LSI 失效
公开(公告)号：JPH0444351A
公开(公告)日：1992-02-14
申请号：JP15247190
申请日：1990-06-11
申请人： HITACHI LTD
发明人： TAKAHASHI KENJI , OGURO TAKAHIRO , YASUDA HIROSHI , ZUSHI SHIZUO , YAMASHITA TETSUHARU , MURAKAMI KYOSHIRO , YOSHIKAWA TOMIO
IPC分类号： H01L23/427
摘要： PURPOSE:To facilitate the start-up of a cooler and shorten the rising time of a computer by heating at least a compressor, out of a compressor and a condenser, during the stoppage of the operation of the cooler body or at the same time with the start-up. CONSTITUTION:The refrigerant gas compressed with a compressor 1 is sent to a condenser 3, and is cooled in cooling water and liquefied and becomes a liquid refrigerant. The liquid refrigerant is sent to an evaporator 2 through an expansion valve 4, and evaporates inside the evaporator 2. By the heat of evaporation at this time, the cooling water inside the cooling water passage 5 is cooled, and by the cooling water, the cooling of an LSI module becomes possible. A heat accumulator 7 is wrapped around the lower part of the compressor 1. Since the head accumulator 7 can absorb the heat generated by the motor inside the compressor 1 during operation and accumulate it, even if the atmospheric temperature inside the computer room drops due to the stoppage of the cooler and the computer main body 19, the heat accumulator 7 continues heating the compressor 1, so the liquid refrigerator does not stay in the compressor 1, and the start-up of a chiller unit becomes easy.

8. 发明专利

JPH03217761A WATER COOLER 失效
公开(公告)号：JPH03217761A
公开(公告)日：1991-09-25
申请号：JP1390490
申请日：1990-01-24
申请人： HITACHI LTD
发明人： YOSHIKAWA TOMIO , YAMASHITA TETSUHARU , MURAKAMI KYOSHIRO , KATO TAKASHI , YASUDA HIROSHI , ZUSHI SHIZUO
IPC分类号： F25B1/00 , F25B49/02 , F25D17/02 , G05D23/19
摘要： PURPOSE:To alter cooling capacity, and to accurately control the temperature of cold water for a cooling load over a wide range by performing capacity- controlling of a compressor under a state where components of cooling modules and the cooling capacities of the modules are the same, and altering the number of the modules to be operated in response to the entire predetermined capacity value as a function of a deviation between a set cold water value to be calculated and the temperature of the cold water. CONSTITUTION:Compressors 8, 12, condensers 9, 13, expanding mechanisms 10, 14 and evaporators 7, 11 of components of cooling modules 2, 3 have the same specifications and equal cooling capacity rated values. The compressors 8, 12 are capacit-controlled under a speed control by an inverter frequency control by cooling module controllers 16, 17 based on a signal from a control module 1. A controller 15 transmits and receives various data by a serial transmission to the controllers 16, 17, and calculates the number of the modules to be operated, and the frequency of the inverter according to a deviation between the temperature of the cold water sensed by a water temperature sensor 6 and a set cold water temperature.

9. 发明专利

JPH05340645A 失效
公开(公告)号：JPH05340645A
公开(公告)日：1993-12-21
申请号：JP14921092
申请日：1992-06-09
申请人： HITACHI LTD
发明人： MURAKAMI KYOSHIRO
IPC分类号： F25B39/00 , F28D1/00
摘要： PURPOSE:To control a capacity by separately forming passages of fluids in a tube of double tubes, and providing valves for regulating flow rates in outlets of the passages of the guides in the tube in a heat exchanger for heat- exchanging the fluids between interior and exterior of the tube. CONSTITUTION:An outer tube 1, an inner tube 2 connected at tube ends to headers 11, 22 are provided, the tube 2 is extended through the header 22 for the outer tube, and fins 3 are formed on an outer periphery of the tube 1. Fluids in the tube are separately fed through a fluid passage A formed in the header 11 and the tube 1, and a fluid passage B formed in the header 22 and the tube 2, combined by a three-way valve 4, and then fed out of a fluid outlet (b). When a heat exchanging amount is controlled. the valve 4 is controlled. If the exchanging amount is, for example, reduced, a flow rate of the passage B in the tube 2 is controlled to be increased, and if the amount is increased, the flow rate of the passage A in the tube 1 is controlled to be increased.

10. 发明专利

JPH05141793A LIQUID COOLING DEVICE 失效
公开(公告)号：JPH05141793A
公开(公告)日：1993-06-08
申请号：JP30155191
申请日：1991-11-18
申请人： HITACHI LTD
发明人： MURAKAMI KYOSHIRO
IPC分类号： F25B1/00
摘要： PURPOSE:To permit refrigerating cycle operation having a stabilized pressure by a method wherein the reduction of the load of the refrigerating cycle is contrived utilizing a heat exchanger for cooling liquid when the temperature of atmosphere is low. constituting a refrigerating cycle CONSTITUTION:In a cooling device, constituting a refrigerating cycle constituted of a compressor 1, a condenser 2, a pressure reducer 3 and an evaporator 4 and cooling liquid through the evaporator 4, a flow passage switching valve and a heat exchanger 7 for cooling the liquid are arranged in the rear stream side of the liquid flow passage of the evaporator 4 and the liquid outlet port of the heat exchanger 7 for cooling liquid is connected to the liquid outlet port 10 of the cooling device to constitute a same passage for the cooling fluid of the condenser 2 and the cooling fluid for the heat exchanger 7 for cooling the liquid.

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