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11. 发明专利

JPH0886477A HEAT PUMP AIR CONDITIONER 失效
公开(公告)号：JPH0886477A
公开(公告)日：1996-04-02
申请号：JP22296694
申请日：1994-09-19
申请人： HITACHI LTD
发明人： HATTA HIROSHI , AOYAMA MITSUGI
IPC分类号： F24F5/00 , F25B13/00
摘要： PURPOSE: To always make the flow of a refrigerant of a plate type heat exchanger opposite to that of a fluid to be cooled thereof and to ensure the performance of the heat exchanger in both cooling and heating operations by reversing the direction of the flow of the fluid flowing through the plate type heat exchanger in tune with the motion of switching of a four-way valve of a refrigerating cycle. CONSTITUTION: In the case of switching a four-way valve 5 in a refrigerating cycle for switching a cooling operation over to a heating operation, a four-way valve 8 of a fluid circuit is also switched in tune with the switching of the four-way valve 5 of the refrigerating cycle. Thereby the direction of flow of a fluid to be cooled (heated) is reversed so that it always be opposed to the flow of a refrigerant. In the case when two three-way valves 9a and 9b are used instead of the four-way valve 8 in the fluid circuit, the passage of the fluid is also switched by the two three-way valves 9a and 9b in tune with the motion of the four-way valve 5 switching the cooling and heating operations over to each other. On both occasions of the cooling and heating operations, according to this constitution, the refrigerant and the fluid to be cooled (heated) always flow opposite to each other and it is easy to ensure an inlet-outlet temperature difference between the fluids.

12. 发明专利

JPH06180152A CHILLED WATER FEEDING DEVICE 失效
公开(公告)号：JPH06180152A
公开(公告)日：1994-06-28
申请号：JP33150392
申请日：1992-12-11
申请人： HITACHI LTD
发明人： ITO TAKESHI , HATTA HIROSHI
IPC分类号： F24F5/00 , F25B1/00
摘要： PURPOSE:To perform an efficient chilled water temperature control in respect to a wide range of setting temperature and various kinds of loads by a method wherein a control constant for use in calculating an operating frequency of a compressor is selected from a plurality of control constants and determined. CONSTITUTION:A chilled water feeding device is comprised of a freezing cycle including a compressor 1 variably controlled in reference to an operating frequency, a condensor 2, and electronic expansion valve 3, an evaporator 4 and a refrigerant pipe 5 connecting these devices, and a control means provided with a controller 12 for controlling the operating frequency and an inverter 13. The chilled water feeding device is connected to a chilled water circuit provided with a pump 6 for circulating chilled water cooled by the evaporator 4 to a load 8 through a chilled water pipe 7. The controller 12 is provided with a plurality of control constants in advance, and as a chilled water setting temperature is inputted, some control constants corresponding to the chilled water setting temperature are selected. In addition, the operating conditions is estimated to determined the most suitable control constant. In addition, a trail operation is carried out, the control constant is determined in reference to information got from the chilled water temperature sensors 9 and 10 and subsequently the chilled water temperature control is carried out at the selected control constant.

13. 发明专利

JPH06174316A COLD WATER SUPPLY APPARATUS 失效
公开(公告)号：JPH06174316A
公开(公告)日：1994-06-24
申请号：JP32163992
申请日：1992-12-01
申请人： HITACHI LTD
发明人： HATTA HIROSHI , YAMASHITA TETSUHARU
IPC分类号： F24F5/00 , F24F11/02 , F25B1/00
摘要： PURPOSE:To simultaneously ensure highly accurate cold water temperature control and expansion of a cold water setting temperature range. CONSTITUTION:There are provided a freezing cycle in which there are successively connected through refrigerant pipings a compressor 1 having a capacity variably controlled in response to an operation frequency, a condenser 2, a pressure reducer 3, and an evaporator 4, and are provided control means 9 for controlling the operation frequency. These two memebers are connected with a cold water circuit including a pump for circulating cold water cooled through the evaporator 4 to a load. There are further provided as temperature sensor 7 on the evaporator 4 for detecting cold water outlet temperature and a temperature sensor 8 on the condenser 2 for detecting cooled medium temperature. The control means 9 includes means for previously storing the upper limit of the operation frequency for preventing overload operation of the compressor 1 in a high temperature region of the cold water temperature, and for determining the upper limit of the operation frequency in response to the cold water setting temperature upon the cold water setting temperature being set to a high temperature. Hereby, the cold water setting temperature can be set to a high temperature and stabilized temperature cold water is ensured.

14. 发明专利

JPH05126414A REFRIGERATOR AND APPARATUS FOR CONSTANT-TEMPERATURE AND CONSTANT-HUMIDITY 失效
公开(公告)号：JPH05126414A
公开(公告)日：1993-05-21
申请号：JP28983891
申请日：1991-11-06
申请人： HITACHI LTD
发明人： KAWAMOTO YASUO , OGAWA TAKEO , WATANABE HIROSHI , HATTA HIROSHI , SHIMIZU MASASHI
IPC分类号： B01L7/00 , B01L99/00 , F25B1/00 , G01N17/00 , G01N25/00
摘要： PURPOSE:To obtain the required temperature for evaporating refrigerant even when the ambient temperature of a refrigerator is high and apply this possibility to an apparatus for constant temperature and constant humidity in maintaining the minimum temperature in a laboratory. CONSTITUTION:A device-control microcomputer calculates the comparison of a temperature detected by a refrigerant-evaporation temperature sensor 15 with a set temperature and a pulse signal corresponding to the difference therebetween is transmitted by a pulse-based adjuster to an electronic proportional control valve 12 as a command for changing the valve opening. Therefore, without being affected by changes in the ambient temperature, the refrigerant- evaporation temperature at an evaporator 13 can be maintained at a specified point in a stabilized state. When the ambient temperature rises high, the evaporation temperature is lowered to a specified point so that the inside of a laboratory consisting of an apparatus for constant temperature and constant humidity can be kept at the specified minimum temperature.

15. 发明专利

JPH03161054A CONTROL OF TEMPERATURE AND HUMIDITY IN CONSTANT TEMPERATURE AND HUMIDITY CHAMBER 失效
公开(公告)号：JPH03161054A
公开(公告)日：1991-07-11
申请号：JP30167389
申请日：1989-11-20
申请人： HITACHI LTD
发明人： HATTA HIROSHI , OGAWA TAKEO , WATANABE HIROSHI
IPC分类号： F24F11/02 , B01L99/00
摘要： PURPOSE:To contrive energy conservation and the improvement of controllability by a method wherein, to maintain the temp. and humidity in the spatial region of a constant temp. and humidity chamber at a constant level, a compressor is so controlled as to bring the output of a heater and a humidifier close to zero. CONSTITUTION:To control temp. and humidity in the spatial region of a constant temp. and humidity chamber enclosed by heat insulating materials, there are provided therein an air blower 1 for circulating air therein, a dry-bulb temp. sensor 2, a wet-bulb temp. sensor 3, a heater 4 and a humidifier 5 controllable by the control output signals from the temp. and humidity controllers 10 and 11 actuated based on the detection signals from the sensors 2 and 3 and an evaporator 6 in a refrigerating cycle made changeable in its cooling and dehumidifying ability by regulating the revolution number of a refrigerant compressor 7. To maintain the temp. and humidity in the aforesaid spatial region at a constant level, the output of the heater 4 and the humidifier 5 are monitored and the revolution number of the compressor 7 is so controlled as to bring a positive number of the minimum value as close as to zero. As a result, energy conservation and the improvement of controllability can be contrived.

16. 发明专利

JPH0278857A REFRIGERATING CYCLE OF CONSTANT TEMPERATURE AND CONSTANT HUMIDITY DEVICE 失效
公开(公告)号：JPH0278857A
公开(公告)日：1990-03-19
申请号：JP23000388
申请日：1988-09-16
申请人： HITACHI LTD
发明人： HATTA HIROSHI , KATSUMATA NAOTO , WATANABE HIROSHI
IPC分类号： F25B1/00
摘要： PURPOSE:To obtain target temperature in a specimen chamber stably regardless of the ambient temperature by setting beforehand the operation frequency of a compressor and the amount of throttling of a pressure reduction mechanism based on the temperature in the specimen chamber and ambient temperature and sensing the temperature in the specimen chamber and ambient temperature by a temperature sensor. CONSTITUTION:The temperature of a specimen chamber sensed by a specimen chamber temperature sensor 14 which is installed in the specimen chamber 16 and the anbient temperature of the atmosphere in which the device is installed sensed by an ambient temperature sensor 15 are taken in a microcomputer 13, and the microcomputer 13 carries out the control of opening and closing of solenoid valves 3, 4, and 5 and frequency control of an inverter 12 as specified beforehand. Namely, if the frequency of a compressor is in the range of low frequency of 30Hz, the solenoid valves are closed to make large the quantity of throttling of a pressure reduction mechanism, and, on the contrary, if the compressor frequency is in the range of high frequency of 50Hz, the solenoid valves are opened and the quantity of throttling of the pressure reduction mechanism is made small. When the ambient tmperature is over +25 deg.C, it is sensed by the sensor 15 and the quantity of throttling of the pressure reduction mechanism is made large to lower the evaporation temperature in order to achieve target temperature of the specimen chamber.

17. 发明专利

JPS6423061A REFRIGERATING CYCLE FOR CONSTANT TEMPERATURE/MOISTURE APPARATUS 失效
公开(公告)号：JPS6423061A
公开(公告)日：1989-01-25
申请号：JP17486487
申请日：1987-07-15
申请人： HITACHI LTD
发明人： HAYASHIDA TATSUO , HATTA HIROSHI
IPC分类号： F25B1/00
摘要： PURPOSE: To execute quick cooling operation even when the temperature in a tank is high and prevent the decline of refrigerating capacity even when the temperature is low by effecting cycle switching by a solenoid valve so as to constitute a cycle using a suction cooler when the temperature in the tank is high and another cycle using no suction cooler when the temperature is low. CONSTITUTION: The refrigerating cycle is switched by means of a microcomputer by making a first electromagnetic valve 7 and a second electromagnetic valve 6 determine a high-temperature state and a low temperature state, with a boundary of +12 deg.C in a tank. When the temperature in the tank is high, a refrigerating cycle using a suction cooler 4 is started by opening the valve 6 and closing the valve 7. In this state, the operation of a refrigerating-cycle compressor 1 becomes possible, because the temperature of the suction gas of the compressor 1 drops. When the temperature in the tank is low, another refrigerating cycle using no suction cooler is started by cutting off the suction cooler by opening the valve 7 and closing the valve 6. Therefore, the deterioration of the refrigerating capacity due to the suction cooler 4 can be prevented in this refrigerating cycle.

18. 发明专利

JPH10141783A AIR CONDITIONER 失效
公开(公告)号：JPH10141783A
公开(公告)日：1998-05-29
申请号：JP30005196
申请日：1996-11-12
申请人： HITACHI LTD
发明人： HATTA HIROSHI , AOYAMA MITSUGI , ISHIKI YOSHIKAZU
IPC分类号： F25B1/00
摘要： PROBLEM TO BE SOLVED: To prevent delay of liquid bypassing operation and to prevent a decrease of cooling capacity in stably operating by stopping execution of the bypass for a predetermined time after a compressor is started, and then control ling execution of the bypass by rasing a discharge side temperature of the compressor. SOLUTION: A solenoid valve 7 is closed when a contact of a temperature switch 9 is closed or when a contact of a timing relay 10 is closed, opened for a predetermined time when a compressor 1 is started, and a liquid bypass is executed. This prevents delay of execution of the bypass due to that a temperature switch 9 does not follow up an abrupt rise of a discharge temperature side of the compressor 1 at the time of starting the compressor. If a predetermined time or more is elapsed after the compressor 1 is operated, the control of the bypass is only by the control of the switch 9, and hence transferred to control of general liquid bypass. Accordingly, at the time of stable operation, the liquid bypass is not unnecessarily operated, and a decrease of cooling capacity due to execution of the bypass can be prevented.

19. 发明专利

JPH09189468A AIR CONDITIONER 失效
公开(公告)号：JPH09189468A
公开(公告)日：1997-07-22
申请号：JP203596
申请日：1996-01-10
申请人： HITACHI LTD
发明人： ITO KOJI , AOYAMA MITSUGI , HATTA HIROSHI , KAMIKURA MASAKAZU , KOMATSU MITSURU
IPC分类号： F25B49/02
摘要： PROBLEM TO BE SOLVED: To prevent the generation of a drastic temperature change after a suction gas temperature and a bypass refrigerant temperature are mixed and hold the temperature of a discharged gas stably by increasing a bypass capillary having an on/off valve by one stage and forming a two stage-capillary. SOLUTION: When the temperature (T) of a discharged gas of a compressor is higher than the opening temperature of an on/off valve 5, the on/off valve is opened. Then, a part of refrigerants is bypassed to a suction pipeline where the temperature (t) of a suction gas of the compressor is lowered, which results in the drop of the temperature T. Then, when T is higher than the opening temperature of an on/off valve 6, the on/off valve 6 is opened so that the refrigerants may be partially bypassed by way of a bypass capillary 8, thereby lowering both t and T. Then, when T is lower than the closing temperature of the on/off valve 6, the on/off valve 6 is closed. Furthermore, when T is lower than the closing temperature of the on/off valve 5, the on/off valve 5 is closed. As described above, this construction makes it possible to prevent the generation of a drastic temperature change after the suction gas temperature is mixed with the bypass refrigerant temperature by opening and closing the on/off valves one by another.

20. 发明专利

JPH0566042A THERMO-HYGROSTAT DEVICE 失效
公开(公告)号：JPH0566042A
公开(公告)日：1993-03-19
申请号：JP12089591
申请日：1991-05-27
申请人： HITACHI LTD , HITACHI SHIMIZU ENG KK
发明人： KAWAGUCHI YUSHI , HATTA HIROSHI
IPC分类号： F24F11/02
摘要： PURPOSE:To detect completion of set value alteration without using special operation in a control method of a thermo-hygrostat device. CONSTITUTION:Execution of preparation 6 of a device controlling set value is delayed by a set temperature alteration protective timer 2 and a set humidity alteration protective timer 4. Hereby, a condenser is prevented from being erroneously operated in the course of the alteration of a set value.

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