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11. 发明专利

JPH08312631A FASTENING CONSTRUCTION OF SHAFT 失效
公开(公告)号：JPH08312631A
公开(公告)日：1996-11-26
申请号：JP11949995
申请日：1995-05-18
申请人： HITACHI LTD , HITACHI SHIMIZU ENG KK
发明人： DOBASHI KAZUHIRO , YAMADA SHINICHIRO , NAKAMURA KENICHI , MAEDA KENSAKU , IMAGAWA MASAHARU , IWASHINA YOSHINORI , NAGAHASHI KATSUAKI
IPC分类号： F16C3/02
摘要： PURPOSE: To facilitate alignment at fastening a shaft by cutting down over two positions on the shaft side at a shaft fastening part into the same form, setting optional one among them to be a drive transmitting plane, and constructing the other cut down parts not to contact with a part to which driving force is transmitted. CONSTITUTION: For fastening an impeller 1 to a driving shaft 3, optional one plane among planes 4a, 4b, 4c is set as a driving force transmitting plane, and positioned against a plane 2b to which driving force is transmitted. Any one of the planes 4a, 4b, 4c can be used as the plane to which driving force is transmitted, and hence alignment at fastening can be easily executed. Further, the fitting directions are three directions of 4a, 4b, 4c, and hence workability is improved. When the impeller 1 is fastened to the driving shaft 3 setting the plane 4a as the driving force transmitting plane, the planes 4b, 4c are not contacted with the impeller 1. Hereby, vibration and noise of an electric motor transmitted from the driving shaft 3 to the impeller 1 can be restrained.

12. 发明专利

JPH08121916A SUCTION PRESSURE-ESTIMATING METHOD 失效
公开(公告)号：JPH08121916A
公开(公告)日：1996-05-17
申请号：JP25786394
申请日：1994-10-24
申请人： HITACHI LTD
发明人： NAKAYAMA SUSUMU , HIBINO YOZO , YASUDA HIROSHI , YAMADA SHINICHIRO , NAKAMURA KENICHI , YOSHIDA SATORU
IPC分类号： F25B49/02
摘要： PURPOSE: To reduce the cost of a suction pressure sensor by estimating the suction pressure of a compressor based on a saturation pressure at an installation part of a temperature sensor in a lower pressure side refrigerant flow passage and an estimated value of pressure loss. CONSTITUTION: The suction pressure during cooling operation is estimated with a controller 151 based on formulas I Pe=α1×Te+α2 in the case of Te =T0, and III ΔP=α5×F where Pe stands for saturation pressure, Te for detected values of temperature sensors 113, 204 and 205, and their minimum values are adopted. ΔP stands for a pressure loss from the position of an adopted temperature sensor to the inlet of a compressor, F stands for a rotary speed of a compressor motor, and α1 to α6 stand for coefficients, and α5 varies with the mounting position of an adopted temperature sensor or a line of a gas pipeline 121. The suction pressure during heating operation is also estimated based on the formulas I, II and III, in this case, Te stands for a detected value of a temperature sensor 112, ΔP stands for a pressure loss from the position of the temperature sensor 112 to the inlet of the compressor. The rotary speed of the motor of the compressor is computed so that the estimated suction pressure may be within a set range, thereby a motor rotary speed controller 152 controls the compressor motor.

13. 发明专利

JPH07145962A AIR CONDITIONER, OPERATING METHOD THEREFOR AND INSTALLING METHOD THEREFOR 失效
公开(公告)号：JPH07145962A
公开(公告)日：1995-06-06
申请号：JP29193593
申请日：1993-11-22
申请人： HITACHI LTD , HITACHI SHIMIZU ENG KK
发明人： IMAGAWA MASAHARU , YAMADA SHINICHIRO , YAGI KOSAKU , NAKAMURA KENICHI , TOGUSA KENJI
IPC分类号： F24F5/00
摘要： PURPOSE:To diversity stable safe transporting, installing operations, resources conservation and a piping and wiring installation state. CONSTITUTION:A plurality of sets of through holes 4 for passing to transport a fork 2 of a transporting fork lift truck are provided at a lower part of an air conditioner body 1, and passed from the front surface to the a rear surface and from one side to the other side. When an air conditioner is transported by the truck, the holes 4 are utilized thereby to eliminate a conventional transporting pallet. The holes 4 are utilized to prevent positional deviations of the form 2 of the truck and a transporting suspending rope at the time of transporting and to enhance safety of stable safe transporting and installing operation. Further, a tube and wires are laid around via the holes 4 thereby to omit a conventional drawing port of the tube and the wires. The roundabout direction of the tube and the wires can be distinctly used according to front, back or side surface, etc., in response to a requirement for an installing place and state, thereby improving serviceability of an installing operation.

14. 发明专利

JPH06323697A OIL SEPARATOR FOR REFRIGERATOR 失效
公开(公告)号：JPH06323697A
公开(公告)日：1994-11-25
申请号：JP11559093
申请日：1993-05-18
申请人： HITACHI LTD
发明人： HAEDA YOSHIO , KOKUNI KENSAKU , YASUDA HIROSHI , NAKAYAMA SUSUMU , YAMADA SHINICHIRO , TOGUSA KENJI
IPC分类号： B01D45/12 , F25B1/00 , F25B43/02
摘要： PURPOSE:To provide an oil separator which can obtain a separability over a wide range of process flow amount by providing a mechanism by which a stream inside a pipe is formed in a swirling stream and oil is separated from the swirling stream by centrifugal force, and the separated oil is accumulated in a double-piped oil accumulator arranged outside through a hole in an inernal wall and then returned to a compressor. CONSTITUTION:Refrigerant gas (a) discharged from a compressor of a refrigerator proceeds in a direction indicated by an arrow (a) and forms swirling stream at a screwing plate 4 along an internal wall of a pipe 1. Oil of a great specific garavity flows along the internar wall of the pipe 1 by centrifugal force which is generated at this time and drops down into an oil accumulator 2 through an oil outlet hole 5 which is formed in the internal wall of the pipe 1. The oil dropping in the oil accumulator 2 is returned to the compressor through an oil return pipe 3. In this instance, as the centrifugal force can be easily changed by changing a screw pitch of the screwing plate 4, oil separating performance can be changed. The oil separating performance can also be changed by changing the length of the screwing plate 4. Thus a separating structure is very simple. In addition, as the oil separation is carried out inside the pipe, there is no need of preparing additionally a place for an exclusive use for the oil separation, and therefore cost can be unexpensive.

15. 发明专利

JPH06185816A REFRIGERATING CYCLE 失效
公开(公告)号：JPH06185816A
公开(公告)日：1994-07-08
申请号：JP33432492
申请日：1992-12-15
申请人： HITACHI LTD , HITACHI SHIMIZU ENG KK
发明人： YAGI KOSAKU , TOGUSA KENJI , YAMADA SHINICHIRO , UESUGI HIDESHI , NAGAI HIDEYUKI , NAKAMURA KENICHI
IPC分类号： F25B1/00 , F25B43/00
摘要： PURPOSE:To provide a refrigerating cycle in which an accumulator can be standardized without necessity of using a large-sized accumulator even when number of compressors is increased to increase a capacity of an entire compressor. CONSTITUTION:A refrigerating cycle comprises a plurality of compressors 1, 2, a condenser 3, a pressure reducing unit 4, an evaporator 5 and accumulators connected via a tube in a closed loop state, wherein the accumulators 9, 10 are mounted by one by one at the plurality of the compressors 1, 2.

16. 发明专利

JPH05231705A CONTROL METHOD OF AIR QUANTITY AND CONTROL METHOD OF AIR QUANTITY AT ROOM TEMPERATURE 失效
公开(公告)号：JPH05231705A
公开(公告)日：1993-09-07
申请号：JP3038592
申请日：1992-02-18
申请人： HITACHI LTD , HITACHI SHIMIZU ENG KK
发明人： YAMADA SHINICHIRO , DOBASHI KAZUHIRO , TOGUSA KENJI , MAEDA KENSAKU , SHIOSAKA YASUNAO
IPC分类号： F24F11/76
摘要： PURPOSE:To operate an air conditioning system economically while ensuring the state of comfortable minimum ventilation at the time of air conditioning. CONSTITUTION:A damper opening is controlled proportionally when an indoor temperature T is kept between a damper proportional minimum-opening indication temperature TO and a damper proportional-control starting temperature TM and the damper opening is fixed in a proportional minimum opening when T is kept between TO and a blast-operation start set temperature TF at the time of cooling operation. On the other hand, only blast operation is conducted under the state, in which the damper opening is fixed in the proportional minimum opening, during a time when T is returned to TO after the temperature of suction air reaches TF through a set indoor temperature TS.

17. 发明专利

JPH05196289A AIR CONDITIONER 失效
公开(公告)号：JPH05196289A
公开(公告)日：1993-08-06
申请号：JP547692
申请日：1992-01-16
申请人： HITACHI LTD , HITACHI SHIMIZU ENG KK
发明人： MAEDA KENSAKU , YAMADA SHINICHIRO
IPC分类号： F24F11/04
摘要： PURPOSE:To enable an automatic removing of polluted air during operation by a method wherein a filter is arranged at an indoor air suction port of an indoor device and the number of operations of a blower for every specified time is increased. CONSTITUTION:An air conditioner in which an outdoor device 9 comprising a compressor 6, a heat exchanger 7 at non-utilized side and an expansion valve 8 at the outdoor device, and an indoor device 1 comprising a heat exchanger 3 at the utilization side, an expansion valve 2 at the indoor device and a blower 4 are connected by refrigerant pipes 11 and 12 is provided with a filter 5 and a control device 10. During operation, only the number of rotation of the blower 4 is regularly increased by the control device 10 and an amount of air is increased to cause indoor air to be supplied again into the room through the filter 5. With such an arrangement, cleaning characteristic against the polluted indoor air can be forcedly carried out.

18. 发明专利

JPH04366344A AIR CONDITIONER 失效
公开(公告)号：JPH04366344A
公开(公告)日：1992-12-18
申请号：JP13996991
申请日：1991-06-12
申请人： HITACHI LTD , HITACHI SHIMIZU ENG KK
发明人： MAEDA KENSAKU , YAMADA SHINICHIRO , NAGAI MAKOTO
IPC分类号： F24F11/02
摘要： PURPOSE:To perform a ventilation operation while keeping a blowing temperature constant by a method wherein a concentration of a specific gas is detected by a sensor disposed at an air suction side of an indoor device and surrounding air is supplied to a suction port of the indoor device while a blowing temperature is controlled to be constant as required. CONSTITUTION:An air conditioner is comprised of a compressor 6, a non-utilized side heat exchanger 10, an outdoor device 5 including an outdoor device expansion valve 8, and an indoor device 1 including a utilization side heat exchanger 7, an indoor device expansion valve 9 and a blower 11, wherein the outdoor device 5 and the indoor device 1 are connected by refrigerant pipes 13, 14. In this case a carbon dioxide concentration sensor 2 (or fluorocarbon or toxic gas sensor or the like) is disposed at the air suction side of the indoor device 1 or within an indoor area. When a concentration higher than a specified value is detected, a surrounding air intake damper 11. is opened with a signal from a control device 4 so as to perform a ventilation work. Concurrently, as the blowing temperature sensor 3 detects a temperature differing from a predetermined blowing temperature, the control device 4 controls the capability of the compressor 6, and a degree of opening of each of the outdoor expansion valve 8 and an indoor device expansion valve 9 so as to keep the blowing temperature at its set value.

19. 发明专利

JPH04359759A METHOD AND DEVICE OF CONTROLLING CAPACITY OF SCREW TYPE COMPRESSOR 失效
公开(公告)号：JPH04359759A
公开(公告)日：1992-12-14
申请号：JP13509891
申请日：1991-06-06
申请人： HITACHI LTD
发明人： YAMADA SHINICHIRO , FUJITA MAKOTO , TERADA HIROKIYO , KAWASAKI KENJI , SEKI OSAMU
IPC分类号： F24F11/02 , F25B1/047 , F25B5/02 , F25B13/00
摘要： PURPOSE:To control a compressor to have a capacity corresponding to a load of an air conditioner at a load side even in the case that a plurality of air conditioners are irregularly energized or stopped during their operations in a multi-type air condition utilizing a screw-type compressor. CONSTITUTION:In a multi-type air conditioner comprising an outdoor device 1 having a screw type compressor assembled therein and a plurality of indoor devices 2, a deviation between a suction air temperature of the indoor devices and a set value is applied as an input, a sliding valve of the screw type compressor is moved in a stepless manner, a capacity of the compressor at that time is calculated in reference to a discharging pressure of the screw type compressor and an input current of the screw type compressor driving motor and the sliding valve is followed and controlled in such a way as the calculated capacity of the compressor becomes within a range of capacity of an operable compressor defined in response to the number of operations of the indoor devices 2. With such an arrangement, the capacity control is carried out with the sliding valve while the capacity of the compressor is being confirmed, so that a stepless capacity control can be carried out and a following accuracy of the capacity of the compressor for a variation of load of the indoor devices 2 is improved.

20. 发明专利

JPH04344054A MULTI-CHAMBER AIR CONDITIONING DEVICE 失效
公开(公告)号：JPH04344054A
公开(公告)日：1992-11-30
申请号：JP11481791
申请日：1991-05-20
申请人： HITACHI LTD
发明人： FUJITA MAKOTO , YAMADA SHINICHIRO , KAWASAKI KENJI
IPC分类号： F24F11/02 , F25B13/00
摘要： PURPOSE:To prevent pressure fluctuations of a refrigeration cycle when the operation number of indoor units is 1. CONSTITUTION:A multi-chamber type air conditioning device constitutes a heat pump type refrigeration cycle where a single outdoor unit, which is main equipment, is connected with a compressor equipped with four indoor units and a hydraulic pressure-driven refrigerant capacity control valve 7 by way of piping. The control system is provided with a detection device 16 which detects that the operation number of the indoor units is 1, and a control device 17 which halts the operation of the compressor 1 temporarily and restarts its operation based on this detected signal. When the operation number of signal units is 1, it is possible to eliminate a temporarily excess in the capacity of the compressor produced by a follow-up lag of capacity control by starting the compressor with the minimum capacity after a specified time has lapsed since its suspension and obtain the operation effect that relaxes drastic pressure fluctuations in the system and enables the operation of a single indoor unit.

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