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1. 发明专利

JP2000028215A MULTI-AIR CONDITIONER 失效
公开(公告)号：JP2000028215A
公开(公告)日：2000-01-28
申请号：JP13879499
申请日：1999-05-19
申请人： HITACHI LTD
发明人： URUSHIBATA TADAYUKI , HARADA FUMIO , TOGUSA KENJI , HOJO TOSHIYUKI , TANAKA KEIJI , KOKUNI KENSAKU , KITANI FUMIHIKO
IPC分类号： F24F5/00 , F25B13/00 , F25B31/00
摘要： PROBLEM TO BE SOLVED: To reduce the number of piping for transferring refrigerant, simplify piping construction work, and reduce consumption of piping, by connecting aggregated gas pipes of a plurality of outdoor units to one end of a common gas pipe, connecting the other end to indoor units, and permitting the plurality of outdoor units to be communicated with each other for keeping balance of oil supply amount between the outdoor units. SOLUTION: Individual liquid pipes 31 and gas pipes 41 of outdoor units 1a, 1b, and individual liquid pipes 32 and gas pipes 42 of indoor units 2a-2d are, respectively, connected to a common liquid pipe 3 and a common gas pipe 4. During cooling operation, a high temperature and high pressure gas discharged from a compressor of the outdoor unit 1a is subjected to heat exchange by an outdoor heat exchanger, and then, distributed to the individual liquid pipes 32 through the liquid pipe 31 and the common pipe 3. Further, a low pressure gas which has been subjected to heat exchange with indoor air by an indoor heat exchanger is merged into the common gas piping 4 through the individual gas pipes 42, and returned to the compressor of the outdoor unit 1a through the gas pipe 41. The outdoor units 1a, 1b are communicated with each other through a pressure equalizer 9 and an oil equalizer 10 thereby preventing unbalance of oil supply amount between the individual outdoor units 1a, 1b with respect to the compressors.

2. 发明专利

JPH11230642A MULTIPLE AIR CONDITIONER 失效
公开(公告)号：JPH11230642A
公开(公告)日：1999-08-27
申请号：JP3450498
申请日：1998-02-17
申请人： HITACHI LTD , HITACHI SHIMIZU ENG CO LTD
发明人： MATSUSHIMA HITOSHI , MICHIHASHI HIROSHI , IGARASHI YASUYUKI , TOGUSA KENJI
IPC分类号： F25B13/00 , F25B41/00 , F25B41/04
摘要： PROBLEM TO BE SOLVED: To perform refrigerant equalization and oil equalization among several outdoor units, by constituting a divider of a main pipe inserted to be vertical with a hearer part and a plurality of branch pipes inserted into a header part on opposite side from the main pipe, and besides, providing neither the main pipe nor the branch pipe with a throttle. SOLUTION: A divider 5 is composed of a cylindrical header part 7 whose tubular axis is roughtly parallel to the floor face, a main pipe 8 which is inserted into the center of the header part 7 so that it may be vertical to the header part 7, and four pieces of branch pipes 9 which are symmetrical to the tubular axis of the main pipe 8 and are inserted into the header part 7 on opposite side from the main pipe 8. Moreover, the main pipe 8 is inserted to have enough opening area, with its tip 8 in rough contact with the tubular wall of the header part 7 on the side of the branch pipe 9. Furthermore, the main pipe 8 is connected to a gas pipe or a liquid pipe, and the branch pipe 9 is connected to the refrigerant pipe from each outdoor unit, and neither the main pipe 8 nor the branch pipe 9 is provided with a throttle.

3. 发明专利

JPH09303886A AIR CONDITIONER 失效
公开(公告)号：JPH09303886A
公开(公告)日：1997-11-28
申请号：JP11596196
申请日：1996-05-10
申请人： HITACHI LTD , HITACHI SHIMIZU ENG KK
发明人： IWASHINA YOSHINORI , NAKAMURA KENICHI , TOGUSA KENJI
IPC分类号： F25B1/00
摘要： PROBLEM TO BE SOLVED: To make proper a variable range of an expansion valve and hence control a flow rate most suitable for a freezing cycle by setting an upper limit value and a lower limit value of an opening of an expansion valve upon operation of the freezing cycle. SOLUTION: An upper limit value and a lower limit value of a valve opening of an expansion valve are set upon operation of a freezing cycle. An outdoor heat exchanger 3 serves as a condenser during cooling operation, and an outdoor expansion valve 4 at this time is used fully opened, an indoor expansion valve 5 serves as an evaporator, and the indoor expansion valve 5 at this time serves as a drawing mechanism, so that a flow rate is adjusted with a small opening. The outdoor heat exchanger 3 serves as an evaporator during heating operation, and the outdoor expansion valve 4 at this time serves as a drawing mechanism, so that the flow rate is adjusted with small opening, and the indoor expansion valve 5 is used fully opened. Hereby, a variable range of the expansion valve is made proper, and a flow rate most fitted to a freezing cycle is controlled without use of complicated control.

4. 发明专利

JPH09159254A OPERATION CONTROL FOR AIR CONDITIONER 失效
公开(公告)号：JPH09159254A
公开(公告)日：1997-06-20
申请号：JP31771795
申请日：1995-12-06
申请人： HITACHI LTD , HITACHI SHIMIZU ENG KK
发明人： SHIOSAKA YASUNAO , TAKENAKA HIROSHI , TOGUSA KENJI
IPC分类号： F24F7/08 , F24F11/02
摘要： PROBLEM TO BE SOLVED: To enhance the reliability while incorporating the comfortableness and economy by providing a thermistor for detecting outdoor and indoor air temperatures and a driving motor for operating or stopping entire heat exchanging rotors. SOLUTION: An entire heat exchange rotors 1 is rotated by driving it by a rotor driving motor 2 according to the command from a control case 5. A compressor 13 for constituting a refrigerating cycle together with a direct expansion coil 12 is also operated or stopped according to a command from the case 5. The case 5 can recognizes the outdoor and indoor air temperatures by outdoor and indoor temperature thermistors 3, 4. Since the air temperature introduced to the coil 12 is decided by the indoor circulating temperature, outdoor suction temperature and the temperature exchange efficiency of the rotor 1, and hence it can be calculated by the case 5. Accordingly, it can judge from the outdoor and indoor air temperatures whether the heating or cooling of the coil 12 by the operation of the compressor 13 is needed or not or whether the heat recovery of the rotor 1 is needed or not to obtain the comfortable indoor diffusing air temperature.

5. 发明专利

JPH0942784A AIR CONDITIONER AND METHOD FOR OPERATING AIR CONDITIONER 失效
公开(公告)号：JPH0942784A
公开(公告)日：1997-02-14
申请号：JP19317595
申请日：1995-07-28
申请人： HITACHI LTD , HITACHI SHIMIZU ENG KK
发明人： IWASHINA YOSHINORI , NAKAMURA KENICHI , YAMADA SHINICHIRO , TOGUSA KENJI
IPC分类号： F24F11/02 , F25B1/00
摘要： PROBLEM TO BE SOLVED: To eliminate the influence of the mechanical manufacturing error of an expansion valve and precisely set the minimum opening degree of the expansion valve by operating a refrigerating cycle while the opening degree of the expansion valve is changed and determining the minimum opening degree of the expansion valve based on the opening degree of the valve when a refrigerant does not flow. SOLUTION: An outdoor machine 5 comprises a compressor 1, a four-way valve 2, a heat exchanger 3a, and an expansion valve 4a. An indoor machine 6 comprises a heat exchanger 3b and an expansion valve 4b. When the opening degrees of the expansion valves 4a and 4b are set to prescribed opening degrees, the compressor 1 is operated and the state of a refrigerating cycle is stabilized, the opening degree of the expansion valve 4a or 4b is changed within a prescribed range of change, the flow rate of the expansion valve is detected and whether a refrigerant flows or not is decided based on the flow rate of the expansion valve. When the refrigerant flows, the opening degree of the expansion valve 4a or the expansion valve 4b is changed within a prescribed range of change to return to a procedure for detecting the flow rate of the expansion valve. When the refrigerant does not flow, the minimum opening degree position of the expansion valve 4a or 4b is determined based on the opening degree of the expansion valve at that time.

6. 发明专利

JPH08124610A TERMINAL BOARD FOR AIR CONDITIONER 失效
公开(公告)号：JPH08124610A
公开(公告)日：1996-05-17
申请号：JP25497794
申请日：1994-10-20
申请人： HITACHI LTD , HITACHI SHIMIZU ENG KK
发明人： MAEDA KENSAKU , YAMADA SHINICHIRO , TOGUSA KENJI
IPC分类号： H01R9/00
摘要： PURPOSE: To enable three phases and a single phase to be simultaneously taken in, so as to reduce the earthing space by forming relay terminal plates of respective phases into a structure having a plurality of upper and lower layers, and providing screws for energizing an upper relay terminal plate to a lower relay terminal plate. CONSTITUTION: Relay terminal plates 2, 2' are fixed to a case 1 by screws 3, 3', so as to be taken as one block, and one block is assigned to one phase out of respective phases of the power supply. Therefore, the earthing space can be reduced by moving the screw 3' with the wiring specification without providing a short-circuit wiring (provided with an over-current protective device).

7. 发明专利

JPH06235572A OIL SEPARATOR OF REFRIGERATING PLANT 失效
公开(公告)号：JPH06235572A
公开(公告)日：1994-08-23
申请号：JP2236893
申请日：1993-02-10
申请人： HITACHI LTD
发明人： HAEDA YOSHIO , NAKAYAMA SUSUMU , KOKUNI KENSAKU , TOGUSA KENJI , YAMADA MASAAKI
IPC分类号： B01D45/06 , B01D45/08 , F25B43/02
摘要： PURPOSE:To obtain a small oil separating mechanism which keeps a high oil separating performance even when the treating flow rate fluctuates, by a method wherein a separating cylinder is held inside the upper part of a main body, and the refrigerant gas strikes against the external wall of the cylinder so that oil falls down and is separated by a centrifuge and the refrigerant gas flows inside the cylinder from below and is discharged outside from the top. CONSTITUTION:A refrigerant gas (a) discharged from a compressor of a refrigerating plant flows into a main body 1 from a suction pipe 2, strikes against a separating plate 5 where most of oil is separated and falls down to the lower pat. As the separating plate 5 has a cylindrical shape, the refrigerant gas (a) is divided into two streams in the opposite directions around the outer wall surface of the cylinder and the two streams strike against each other at the place opposite to the inlet, causing the oil to be separated further. The separated refrigerant gas (a) flows down and into the separating plate 5 from below, passes through the inside of the separation plate 5 and is discharged outside through an outlet pipe 3 as a delivered gas (b). As the falling direction of the separated oil is opposite to the flow direction of the separated refrigerant gas (a), the flow of the refrigerant gas (a) has no effect on an oil surface 10 even when the treating flow rate becomes high, preventing the oil rescattering phenomena from occurring.

8. 发明专利

JPH06137586A DRAIN PUMP CONTROLLER FOR AIR CONDITIONER 失效
公开(公告)号：JPH06137586A
公开(公告)日：1994-05-17
申请号：JP28982992
申请日：1992-10-28
申请人： HITACHI LTD , HITACHI SHIMIZU ENG KK
发明人： ONO TOSHIFUMI , IMAGAWA MASAHARU , TOGUSA KENJI
IPC分类号： F24F11/02 , F24F13/22 , F24F1/00
摘要： PURPOSE:To prevent inhibition of room cooling due to overflow of drain water and waviness of drain water in an air conditioner. CONSTITUTION:The drain pump controller comprises a heat exchanger 1, a water receiver 2 for storing drain water, a float switch 3 for monitoring a level of the drain water, a drain pump 4, a drain tube 5 and a controller 6. The pump 4 is operated while a compressor is stopped as long as the switch 3 is operated at the time of room cooling. Thus, since the compressor is stopped at the time of operating the pump 4, an increase in the drain water due to room cooling can be prevented, and inhibition of room cooling due to waviness of the drain water can be prevented.

9. 发明专利

JPH06129674A AIR CONDITIONER 失效
公开(公告)号：JPH06129674A
公开(公告)日：1994-05-13
申请号：JP27568792
申请日：1992-10-14
申请人： HITACHI LTD , HITACHI SHIMIZU ENG KK
发明人： IMAGAWA MASAHARU , YAMADA SHINICHIRO , TOGUSA KENJI
IPC分类号： F24F5/00
摘要： PURPOSE:To reduce noise due to a blower and also to increase a blowing efficiency by combining the main body of air conditioner with a blowing device. CONSTITUTION:A heat exchanger 8 is provided in an air conditioner 3. An intake port 6 for introducing air is provided on one side of the heat exchanger 8, and during an ordinary operation by a fan motor 2 and a propeller fan 7, the air is sent to the upper part of the air conditioner 3 from an intake port 6. In order to increase a blowing effect, the air conditioner is made to have a structure making it possible to use it in combination with a blowing device 4. The blowing device 4 has a structure provided with the fan motor 2, the propeller fan 7 and straightening plates 1. Besides, the blowing device 4 can operate in gearing with the motion of the air conditioner 3. The number of the straightening plates 1 is different from that of vanes of the propeller fan 7 and it is possible to suppress a swirl generated in a stream of air at the time of blowing and to straighten the stream by the straightening plates 1. Accordingly, the blowing device of which the noise is suppressed efficiently is obtained. Besides, the air conditioner can be made small in size and a long duct can be used for a draft duct 5.

10. 发明专利

JPH05118625A AIR CONDITIONER 失效
公开(公告)号：JPH05118625A
公开(公告)日：1993-05-14
申请号：JP28267591
申请日：1991-10-29
申请人： HITACHI LTD
发明人： HOJO TOSHIYUKI , TOGUSA KENJI , KOKUNI KENSAKU , NAKAYAMA SUSUMU
IPC分类号： F24F11/02
摘要： PURPOSE:To prevent a frequent changing-over of mode in a multi-chamber type air conditioner capable of performing a simultaneous cooling and heating operation by a method wherein the changing-over of operation mode is controlled under a changing-over judgement condition of the operation mode using an air conditioning load including an operating capacity of an indoor cooling and heating device, the temperature of indoor suction air and the set temperature. CONSTITUTION:To a control part 1 are connected an operation switch 2, a protection device 3, an indoor device suction air temperature sensor 4, a surrounding air temperature sensor 5, a compressor 6, a blower device 7, an indoor or outdoor air flow rate adjusting valve 8, an indoor or outdoor on/off valve 9 and a memory element 10. The control part 1 calculates a difference between a cooling load LR and a heating load LH and performs an operation mode changing-over control. That is, a hysteresis in the case that the heating mode is changed over to the main heating mode is provided and another hysteresis in the case of another changing-over is provided. The operation is controlled in such a way as the operation mode is not varied in response to a variation of cooling load and a heating load not exceeding the hysteresis after changing-over from the heating mode to the heating main mode. The hysteresis is provided in each of the operation mode changing-over conditions and it is similarly controlled for every case.

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