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1. 发明专利

JPH03255855A REFRIGERATION CYCLE FOR THERMOSTATIC AND CONSTANT HUMIDITY DEVICE 失效
公开(公告)号：JPH03255855A
公开(公告)日：1991-11-14
申请号：JP5364890
申请日：1990-03-07
申请人： HITACHI LTD
发明人： SHIMIZU MASASHI , OGAWA TAKEO , HATTA HIROSHI , KAWAGUCHI YUSHI , TAKI KATSUHIKO
IPC分类号： F24F11/02 , F25B1/00
摘要： PURPOSE:To control the flow of refrigerant and prevent the damage of a compressor by transmitting a signal that opens an electronic proportional control valve used as a decompression mechanism when the compressor is halted if the indoor temperature is higher and a signal that closes said control valve if the room temperature is lower. CONSTITUTION:When the temperature of a testing room 14 is higher, the room temperature is measured by a dry-bulb temperature sensor 12. An electronic proportional control valve 4 is full-opened by a command from a control means 8 and then a compressor 1 is halted. Then, the refrigerant in a vaporizer 3 is diffused and transferred a lower temperature condenser and a compressor, preventing the refrigerant from moving to the compressor alone and resolving a foaming phenomenon during start-up of the compressor and the like. When the temperature in a testing chamber 14 is lower, the room temperature is measured by a sensor 12. The valve 4 is full-closed by the command from the control means 8 and then the compressor 1 is halted. Then, the refrigerant in a condenser 2 once tends to move to the lower temperature vaporizer. However, the control valve 4 is full-closed, it will not move, which makes it possible to prevent liquid compression induced by the flow-in of liquid refrigerant from the vaporizer during restarting the compressor.

2. 发明专利

JPH02237648A THERMO-HYGROSTAT 失效
公开(公告)号：JPH02237648A
公开(公告)日：1990-09-20
申请号：JP5775589
申请日：1989-03-13
申请人： HITACHI LTD
发明人： KAWAMOTO YASUO , KATSUMATA NAOTO , HATTA HIROSHI
IPC分类号： B01L7/00 , B01L99/00
摘要： PURPOSE:To prevent excessive rise in temp. by neglecting a timecard which controls restarting at a time of stoppage of a compressor insofar as a time when the temp. in a laboratory is raised and enabling restarting of a refrigerator at the same time when this temp. reaches the preset temp. CONSTITUTION:A restarting time card after stoppage of a compressor is eliminated only at a time when the temp. in a laboratory is raised. The present temp. T in the laboratory is regulated to the preset temp. Tm1 and transferred to the preset temp. Tm2 of the ensuing step. Therefor the output of a heater is increased. At the same time when the temp. T in the laboratory reaches the preset temp. Tm2, a stopped refrigerator is instantaneously started because the timecard is eliminated. Cooling operation is restarted and it is prevented that the temp. T in the laboratory exceeds the preset temp. Tm2 and is excessively raised. Thereby safe operation is enabled.

3. 发明专利

JPH05203200A CHILLED WATER SUPPLYING APPARATUS 失效
公开(公告)号：JPH05203200A
公开(公告)日：1993-08-10
申请号：JP1472492
申请日：1992-01-30
申请人： HITACHI LTD
发明人： HATTA HIROSHI
IPC分类号： F24F5/00 , F25D17/02
摘要： PURPOSE:To supply chilled water of stable water temperature even after a temperature sensor malfunctions in which an apparatus is stopped or a temperature control becomes impossible. CONSTITUTION:When a water temperature sensor 5 malfunctions, outlet chilled, water temperatures of chilled water supply units are sensed by outlet water temperature sensors 4, and an average value is calculated by a controller 6 to be used instead of a measured water temperature. In order to eliminate a deviation of a measured value generated due to an irregularity in flow rates of the chilled waters of the respective units, a difference between the average value at the time of ordinary operation and the measured value is considered or an average value calculated from the actually measured flow rates is used.

4. 发明专利

JPH04327762A FREEZING CYCLE IN THERMOSTATIC DEVICE 失效
公开(公告)号：JPH04327762A
公开(公告)日：1992-11-17
申请号：JP9672791
申请日：1991-04-26
申请人： HITACHI LTD , HITACHI SHIMIZU ENG KK
发明人： SHIMIZU MASASHI , HATTA HIROSHI , TAKI KATSUHIKO
IPC分类号： F25B1/00
摘要： PURPOSE:To make a proper setting of an injection volume and an oil cooler passing amount and to restrict a disturbance of a freezing cycle as well as a disturbance of humidity control by a method wherein an electronic valve capable of controlling a flow rate of refrigerant is applied and a liquid injection device and an oil cooler mechanism are integrally assembled. CONSTITUTION:Each of an evaporator 4, a heater 6, a humidifier 7 and a blower 8 is disposed within a spacing defined by a thermal insulating material 15. The evaporator 4 constitutes one freezing cycle together with a compressor 1, a condensor 2 and a pressure reducing mechanism 3. With such an arrangement as above, a branch part is provided between the condensor 2 and the pressure reducing mechanism 3, and an inlet pipe of the oil cooler 1a is connected to the branch part. In turn, an outlet pipe of the oil cooler 1a is connected to a branch between the evaporator 4 and a suction side of the compressor 1 through an electronic expansion valve 5. The electronic expansion valve 5 is controlled by a controlling micro-computer 16 in response to a room temperature, a gas temperature, a hot water temperature and a water temperature detected by each of a plurality of sensors 9, 11, 12 and 13.

5. 发明专利

JPH03225161A LIQUID INJECTION DEVICE OF FREEZING CYCLE IN THERMOSTATIC DEVICE 失效
公开(公告)号：JPH03225161A
公开(公告)日：1991-10-04
申请号：JP2124890
申请日：1990-01-31
申请人： HITACHI LTD
发明人： HATTA HIROSHI , OGAWA TAKEO , SHIMIZU MASASHI
IPC分类号： F25B1/00
摘要： PURPOSE:To enable a disturbance of a freezing cycle caused by a liquid injection to be reduced by a method wherein a liquid injection refrigerant passage is arranged to be connected to a refrigerant passage branched from a refrigerant passage between a condensor and a pressure reducing mechanism, passing through an oil cooler of a pressure device and an electrical expansion valve and between an evaporator and a suction side of a compressor. CONSTITUTION:A branch pipe is arranged between a condensor 2 and a pressure reducing mechanism 3 and then the branch pipe is connected to an inlet pipe of an oil cooler 1a of a compressor. An outlet pipe of the oil cooler 1a is connected through an electronic expansion valve 5 to the branch pipe arranged between an evaporator 4 and a suction of the compressor 1. A temperature sensor 8 detects a temperature in a thermostatic chamber, a temperature sensor 9 detects a temperature outside the thermostatic chamber, a temperature sensor 10 detects a temperature of discharged gas of the compressor and a temperature sensor 11 detects an oil temperature of the compressor. A micro-computer 12 takes each of the temperatures detected by the sensors 8 to 11, calculates these temperature signals and outputs a proper pulse-like signal of a degree of opening to the electronic expansion valve 5.

6. 发明专利

JPH01212333A THERMAL SHOCK TESTING APPARATUS 失效
公开(公告)号：JPH01212333A
公开(公告)日：1989-08-25
申请号：JP3526288
申请日：1988-02-19
申请人： HITACHI LTD
发明人： HATTA HIROSHI
IPC分类号： G01N3/60
摘要： PURPOSE:To prevent discharged hot air from going to the protective device such as the fire alarm mounted to a ceiling, by arranging a wind altering plate capable of arbitrarily altering the discharge direction of exhaust gas to the exhaust gas discharge port of an exhaust duct. CONSTITUTION:The change-over dampers 10, 11 of a testing apparatus 1 are opened and the high temp. air heated by the heater 16 in a high temp. tank 3 is sent into a testing chamber 1 to heat a specimen. When a high temp. test is finished, the dampers 10, 11 are closed and the high temp. tank 2 enters preheating operation. Then, change-over dampers 21, 23 are opened and the testing chamber 1 is exposed to the open air. At this time, the air sucked in from an open air intake port 26 passes through a blower 24 and an air feed port 20 to reach the testing chamber 1. The high temp. air present in the testing chamber 1 is discharged through a discharge port 22, a discharge duct 27 and an exhaust gas discharge port 28. A support stand 32 is mounted to the discharge port 28 and a wind altering plate 29 supported in a freely revolvable manner by a pin 33 is mounted to the upper part of the support stand 32. By changing the direction of said altering plate 29, the flow direction of discharged air can be changed arbitrarily.

7. 发明专利

JPH116657A AIR-CONDITIONER 失效
公开(公告)号：JPH116657A
公开(公告)日：1999-01-12
申请号：JP15948297
申请日：1997-06-17
申请人： HITACHI LTD
发明人： HATTA HIROSHI , AOYAMA MITSUGI , MAKINO KIYOKAZU
IPC分类号： F25B1/00
摘要： PROBLEM TO BE SOLVED: To reduce temperature change in fluid to be cooled by closing the oil-returning piping of the oil separator at the discharge side of a compressor being stopped, and by switching to an oil-returning piping for returning refrigerating machine oil to intake piping of the compressor being stopped when operation state is switched to unloader control. SOLUTION: The temperature of fluid to be cooled that is cooled by an evaporator 5 is detected by a sensor 7 and the number of compressors 1a, 1b, and 1c is controlled (unloader control). Also, solenoid valves 8a, 8b, and 8c are arranged in oil-returning pipes 6a, 6b, and 6c. Then, immediately when operation state is switched to the unloader control, the solenoid valves such as the solenoid valves 8a and 8b are closed, and the solenoid valve 8c is opened, thus preventing refrigerating machine oil from flowing into the compressor 1c being stopped, and at the same time successively returning the refrigerating machine oil to the compressors 1b and 1c via the oil-returning pipes 6b and 6a. As a result, the unbalance of the refrigerating machine oil and the adhesion and seizure of the compressors 1a-1c can be prevented.

8. 发明专利

JPH06307726A COLD WATER FEEDING DEVICE 失效
公开(公告)号：JPH06307726A
公开(公告)日：1994-11-01
申请号：JP9935493
申请日：1993-04-26
申请人： HITACHI LTD
发明人： HATTA HIROSHI , YAMASHITA TETSUHARU
IPC分类号： F25B1/00 , F25D13/00
摘要： PURPOSE:To suppress the occurrence of turbulence of a cold water temperature during starting by regulating the number of working modules during the starting of a device, in a cold water feeding device attached to a computer cooling device using cold water and provided with a plurality of cold water feeding modules. CONSTITUTION:A plurality of cold water feed modules 2 (2a-2c) which have freezing cycle structure and produce cold water cooled by means of a vaporizer are interconnected in parallel to form a cold water feeding device 1, and the device 1 is connected in series to a load 4. A cold water temperature at the outlet of a cold water feeding device 1 is detected by a temperature sensor 5. Based on a deviation of a detected temperature from a set temperature, the number of working modules 2 is controlled, capacity of each module 2 is controlled, and the starting and the stop of a cold water pump 3 are controlled by means of a controller 6. In this case, a manual operation setting means to set the number of working modules 2 during the starting of a device is provided. A balance between the magnitude of the load 4 during the starting of the device and cold water feed capacity is kept, and the occurrence of a fluctuation in the number of working modules right after stating is suppressed.

9. 发明专利

JPH05133662A COLD WATER SUPPLY DEVICE 失效
公开(公告)号：JPH05133662A
公开(公告)日：1993-05-28
申请号：JP29700791
申请日：1991-11-13
申请人： HITACHI LTD
发明人： HATTA HIROSHI , MURAKAMI KYOSHIRO
IPC分类号： F25D11/00 , F25D17/02 , H05K7/20
摘要： PURPOSE:To ensure with a single device two merits: one of achieving stable outlet water temperature and the other of settable lower limit water temperature being low by switching by a combination of a three-wave valve and a solenoid valve a series circuit composed of an evaporator, a pump, and a load and a parallel circuit composed of the evaporator and the load with the pump therebetween. CONSTITUTION:In a cold water supply device wherein a pump 2 is provided for circulating cold water heat-exchanged in an evaporator 1 between it and a load and wherein device outlet cold water temperature is controlled to a set temperature following the increase and decrease of cooling apability of a freezing cycle, there are provided a flow passage changeover three-way valve 9 on the primary side of the pump 2 in a water circuit and a flow passage opening/closing solenoid valve 8 on the secondary side of the pump. With a combination of such opening and closing, there are changed over a series circuit including the evaporator 1, the pump 2 and the load 3 connected successively in series through a water piping and a parallel circuit including the evaporator 1 and the load 3 connected in parallel with the pump 2 therebetween through a water piping.

10. 发明专利

JPH09243213A AIR CONDITIONING EQUIPMENT 失效
公开(公告)号：JPH09243213A
公开(公告)日：1997-09-19
申请号：JP5578896
申请日：1996-03-13
申请人： HITACHI LTD
发明人： HATTA HIROSHI , AOYAMA MITSUGI , TSUDA YUKIO , KAMIKURA MASAKAZU , ITO KOJI
IPC分类号： F25B49/02
摘要： PROBLEM TO BE SOLVED: To prevent a deviation of a refrigerating machine oil in air conditioning equipment in which a plurality of compressors are arranged in parallel by arranging oil separators on delivery pipings of the compressors to connect oil return tubes respectively to suction pipings of adjacent compressors sequentially. SOLUTION: Compressors 1a-1c are arranged in parallel and oil separators 1a-2c are connected respectively to delivery pipings thereof. Oil return tubes 6a-6c of the oil separators are connected to suction pipings of the adjacent compressors 1. For example, the oil return piping 6a is connected to the suction piping of the compressor 1b. Outlet pipings of the oil separators 2 are grouped into one and connected to a condenser 3. The temperature of a fluid to be cooled as cooled by an evaporator 5 is detected by a sensor 7 to control the number of operating units of the compressors 1. The individual oil return pipes 2 are connected to suction pipings of the adjacent compressors 1 sequentially to prevent the deviation of a refrigerating machine oil. The compressors 1 to be started or stopped during the control of the operating units thereof are set at random by utilizing random number, thereby achieving a leveling of the operation time of the compressors 1.

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