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1. 发明专利

JP2000337718A REFRIGERATING SYSTEM 失效
公开(公告)号：JP2000337718A
公开(公告)日：2000-12-08
申请号：JP14765299
申请日：1999-05-27
申请人： HITACHI LTD , HITACHI SHIMIZU ENG CO LTD
发明人： MIYA TOMOAKI , UNO MASAKI , HATTORI NAOKI
IPC分类号： F25B1/00 , F25B1/04
摘要： PROBLEM TO BE SOLVED: To provide a refrigerating system capable of optimally operating corresponding to a capacity with varying load capacity by changing the operation capacity by inverter-controlling a small capacity compressor between two different capacity scroll compressors and changing the revolutions of the compressor and the operation number of the compressors. SOLUTION: By providing a control means for detecting a low pressure corresponding to a load with a suction pressure sensor 6 and processing it with a controller 7 to change the revolutions of scroll compressors 1a, 1b and the operation number of the same, hereby, the capacity change width at the time of controlling the number of machines of refrigerating apparatuses in each of which two different capacity compressors are combined, can be reduced.

2. 发明专利

JPH10141784A REFRIGERATOR 失效
公开(公告)号：JPH10141784A
公开(公告)日：1998-05-29
申请号：JP30005396
申请日：1996-11-12
申请人： HITACHI LTD , HITACHI SHIMIZU ENG KK
发明人： AOYANAGI MASAAKI , HATTORI NAOKI , OTA KAZUMASA
IPC分类号： F25B1/00
摘要： PROBLEM TO BE SOLVED: To perform energy conservation operation and to reduce a change of interior temperature of a display case by automatically changing a pressure set value of a microcomputer controller according to load change and hence executing optimum operation control in response to a largely varying load, and reducing ON/OFF control of a refrigerator. SOLUTION: In the case of an operation stopping state, when number of times of stops is integrated to reach a set number, a pressure set value is slightly slid upward. In this case, only a capacity down value may be slid upward, and a capacity up value and operation stop value may simultaneously slid. The number of times of stops is different depending upon size of a facility, indoor temperature and load change. Since it is repeatedly controlled, about 4 to 6 times/hour may be sufficient. Sliding width of the pressure set value may be slightly about 0.01MPa. Thus, number of times of ON/OFF of a refrigerator is reduced, operating pressure is enhanced, and energy conservation can be more enhanced.

3. 发明专利

JPH08144983A COMPRESSOR OVERHEAT PREVENTION DEVICE FOR REFRIGERATING UNIT 失效
公开(公告)号：JPH08144983A
公开(公告)日：1996-06-04
申请号：JP29256594
申请日：1994-11-28
申请人： HITACHI LTD , HITACHI SHIMIZU ENG KK
发明人： TAKI KATSUHIKO , UESUGI HIDESHI , HATTORI NAOKI
IPC分类号： F04C29/04 , F04C18/02
摘要： PURPOSE: To increase the cooling effect of a high-pressure coolant and effectively prevent the overheat of a compressor by leading a connection tube through a condenser, regarding the unit where a part of a high-pressure coolant liquefied with a condensor for a refrigrating cycle is introduced to a compression chamber via a connection tube for cooling a scroll compressor. CONSTITUTION: In a refrigerating cycle consisting of a compressor 1, a condensor 2, an expansion valve 3 and an evaporator 4, an overheat preventing connection pipe 5 is branched and one end thereof is jointed to the intermediate section of a high-pressure liquid piping led from the condensor 2. The other end of the pipe 5 is communicated and connected to a compression chamber for the compression stroke of the compressor 1. Also, a high-pressure coolant adjusted with a capillary tube 8 as a flowrate adjusting mechanism is made to blow for cooling the compressor 1. The pipe 5 is fitted with a solenoid valve 7, and this valve 7 is made to open, when the temperature of compressor discharge gases rises to the preset level or higher. Furthermore, the pipe 5 is connected to heat exchanger piping 6, thereby effectively cooling a coolant in the pipe 5.

4. 发明专利

JPH07190508A FREEZER 失效
公开(公告)号：JPH07190508A
公开(公告)日：1995-07-28
申请号：JP33048793
申请日：1993-12-27
申请人： HITACHI LTD , HITACHI SHIMIZU ENG KK
发明人： HIRAOKA SEIJI , HATTORI NAOKI
IPC分类号： F25B1/00
摘要： PURPOSE:To provide a freezer which is capable of improving the follow-up property to a load and preventing the start of a compressor from being frequently initerrupted by measuring pressure at an inlet of the compressor and automatically altering a time interval till the time the operation number of the compressors when the pressure value exceeds a preset range. CONSTITUTION:There are inputted into a control board 7 for controlling capacity a defrosting completion signal and a pressure signal detected by a pressure detector 6. After the defrosting, a load is increased together with an increase of variations thereof. Accordingly, once the defrosting completion signal is inputted, a certain predetermined time after the defrosting, i.e., a time interval till the capacity control is again performed is reduced. Hereby, the follow-up property with larger pressure variations is ensured, and reversely with smaller variations of pressure frequency of starting or interruption of each of compressors 1a, 1b, 1c can be restricted. As a result, the load of the compressor is reduced to avoid an increase of the power cost, overheating of a motor, and the shortening of the life of the motor.

5. 发明专利

JPH06323641A REFRIGERATOR 失效
公开(公告)号：JPH06323641A
公开(公告)日：1994-11-25
申请号：JP11679593
申请日：1993-05-19
申请人： HITACHI LTD , HITACHI SHIMIZU ENG KK
发明人： HIRAOKA SEIJI , HATTORI NAOKI , YAMADA KUNIYOSHI
IPC分类号： F25B1/00
摘要： PURPOSE:To carry out a stable discharged gas temperature control even in an operation condition of a lack of refrigerant by a method wherein a container of a small volume is arranged in the midway part of a high pressure liquid refrigerant pipe connecting a liquid receiver and an expansion valve and a bypassing circuit is connected to the container. CONSTITUTION:A container 6 having a small volume is fixed in the midway part of a high pressure liquid pipe connecting from a liquid receiver 2 to an expansion valve 4. To the container 6 is connected a bypassing circuit comprising a solenoid valve 7 and a capillary tube 8. With such an arrangement as mentioned above, even in the case that an accumulating amount of refrigerant in a condensor 2 or an evaporator 5 is increased and the interior of the high pressure liquid pipe becomes flash state, refrigerant fed from the upper end into the container 6 is easily separated into liquid segment and gas segment and then a certain degree of liquid refrigerant can be stored at the lower part of the container 6. As a result, the bypassing circuit for use in injecting refrigerant to the compressor 1 is fixed to the lower end of the container 6, thereby only liquid can be supplied to the bypassing circuit even if the liquid pipe is somewhat in a flash state, resulting in that a stable discharged gas temperature control can be carried out.

6. 发明专利

JPH06193977A REFRIGERATOR 失效
公开(公告)号：JPH06193977A
公开(公告)日：1994-07-15
申请号：JP34599992
申请日：1992-12-25
申请人： HITACHI LTD
发明人： HIRAOKA SEIJI , HATTORI NAOKI
IPC分类号： F25B1/00
摘要： PURPOSE:To suppress fluid sound to a minimum limit by selecting a bypass circuit having different passage resistance in response to a high pressure immediately before starting. CONSTITUTION:A refrigerating cycle is formed of main units such as a compressor 1, a condenser 2, a liquid receiver 3, an expansion valve 4 and an evaporator 5. A back-flow preventive check valve 6 is provided on the way of a discharge tube of the compressor 1, connected at this side with a high pressure side and a low pressure side of the compressor 1, and bypass tubes 7a, 7b having different passage resistances and solenoid valves 8a, 8b are mounted on the way. When a low pressure switch 10 is reset, a high pressure is sensed by a high pressure switch 11 together with an operation signal and it is a set pressure or more, the valve 8a is opened, and a pressure in a compressor chamber is released to a low pressure side via the tube 7a having a small passage resistance. If it is the set pressure or less, the valve 8a is closed, the valve 8b is opened to release the pressure in the chamber to a low pressure side via the tube 7b having larger passage resistance than that of the tube 7a. Thus, fluid sound can be suppressed to a minimum limit.

7. 发明专利

JP2002130850A REFRIGERATING PLANT 失效
公开(公告)号：JP2002130850A
公开(公告)日：2002-05-09
申请号：JP2000332127
申请日：2000-10-26
申请人： HITACHI LTD
发明人： MAEZAWA TOSHIO , UNO MASAKI , TAKI KATSUHIKO , HATTORI NAOKI
IPC分类号： F25B1/04 , F25B1/00
摘要： PROBLEM TO BE SOLVED: To provide a refrigerating plant that can secure the reliability of parts by preventing an increase in pulsation and liquid compression which occur in a liquid injection circuit. SOLUTION: This refrigerating plant has a means which closes the liquid injection circuit before a compressor is stopped and another means which opens the liquid injection circuit after the compressor is started. Consequently, this plant can secure the reliability of parts by preventing an increase in pulsation and liquid compression which may occur in the liquid injection circuit.

8. 发明专利

JP2001300187A ELECTRIC WASHING MACHINE 失效
公开(公告)号：JP2001300187A
公开(公告)日：2001-10-30
申请号：JP2000118441
申请日：2000-04-19
申请人： HITACHI LTD
发明人： HATTORI NAOKI , SOMA TSUNEHIRO , HOSOKAWA ATSUSHI , OGURA TAKESHI , ITO SHOICHI , HANAWA NOBUYUKI
IPC分类号： D06F37/40
摘要： PROBLEM TO BE SOLVED: To reduce the operation sound of the claw clutch mechanism of an electric washing machine. SOLUTION: By PWM controlling a driving current to be supplied to an electromagnetic coil 47a in the claw clutch mechanism 47, the rise of the driving current is made gentle and the moving speed of a slider 47c is mitigated.

9. 发明专利

JP2001240371A ELECTRIC HOIST 失效
公开(公告)号：JP2001240371A
公开(公告)日：2001-09-04
申请号：JP2000060397
申请日：2000-03-01
申请人： HITACHI LTD
发明人： ISHIKAWA SATOSHI , HATTORI NAOKI
IPC分类号： B66C13/22 , B66D1/46
摘要： PROBLEM TO BE SOLVED: To reduce waste in a controller. SOLUTION: A basic specification control part having an inverter control circuit for winding for controlling an inverter driving part for winding and an inverter control circuit for transverse movement for controlling an inverter driving part for transverse movement, and a specified specification controlling part for controlling plural outputs and inputs such as a co-hoisting operation, and an automatic detection operation for a hoisted cargo height as specified specifications other than inverter control are provided individually in this hoist machine provided with an electric motor for the winding for hoisting the hoisted cargo vertically, an electric motor for the transverse movement for transferring the cargo transversely, the inverter driving part for the winding for driving the electric motor for the winding, the inverter driving part for the transverse movement for driving the electric motor for the transverse movement, and an external operation part for directing operations for the hoisting-up and -down of the electric motor for the winding and an operation for the transverse movement of the electric motor for the transverse movement.

10. 发明专利

JP2000007285A INVERTER DRIVE HOIST 失效
公开(公告)号：JP2000007285A
公开(公告)日：2000-01-11
申请号：JP16950898
申请日：1998-06-17
申请人： HITACHI LTD
发明人： HATTORI NAOKI , ISHIKAWA SATOSHI
IPC分类号： B66D1/46
摘要： PROBLEM TO BE SOLVED: To improve the safety by judging the stop of a motor by a signal of an encoder connected with the motor for winding up after operating and outputting a mechanical brake and continuing the output of an inverter until the stop is detected to maintain output torque of the motor. SOLUTION: After receiving a stop command of a hoist operation machine 6, a hoist controller 1 sends a step deceleration start command to an inverter 2, performs deceleration processing until it reaches a start frequency, and maintains a frequency output after reaching the start frequency. Since torque is set for rated load, a motor for winding up 3 prevents the drop of a cargo while an output frequency of the inverter 2 is maintained. Moreover, the hoist controller 1 monitors an output frequency of the inverter 2 and gives instructions for output stop of the inverter 2 after detecting the stop of a mechanical motor by an encoder signal at the same time when the output frequency reaches the start frequency. A frequency output of the inverter 2 is maintained until the output stops, and torque output of the motor for winding up is maintained.

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