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1. 发明专利

JPH10339295A BLOWER 失效
公开(公告)号：JPH10339295A
公开(公告)日：1998-12-22
申请号：JP14754697
申请日：1997-06-05
申请人： HITACHI LTD , HITACHI SHIMIZU ENG KK
发明人： TSUKADA FUKUJI , TANAKA KIHACHIRO , NAGAI MAKOTO , YONEYAMA HIROYASU
IPC分类号： F04D29/34 , H02K7/02 , H02K7/14
摘要： PROBLEM TO BE SOLVED: To absorb the vibration when the natural frequency of the vibration system of a fan and a motor is resonated with the frequency of the electromagnetic excitation force of the motor by fixing an inertia member having a center hole in which a rotary shaft of the motor is inserted and having the rotational inertia not less than that of a rotor of the motor to the rotary shaft together with the fan. SOLUTION: A motor 2 to derive a fan 1 in an indoor unit of an air conditioner for business use is fixed to a top plate 3 through a vibration isolating rubber 23. A heat exchanger 4 is arranged on an outer circumferential part of the fan 1, and fixed to the top plate 3. A water receiver 5 for the drain is arranged on a lower part of the heat exchanger 4. A steel damper 8 is arranged on an upper part of a hub 32 between a boss part 33 of the fan 1 and a blade part 11, i.e., on a non-flow passage side of a supply passage, and inserted in a rotary shaft 9 together with the fan 1, and fixed to the rotary shaft by fitting screws. The steel damper 8 is provided to change the natural frequency in the rotational direction and the vibration mode so that the rotational inertia of the damper is larger than that of the rotor.

2. 发明专利

JPH10332211A AIR CONDITIONER 失效
公开(公告)号：JPH10332211A
公开(公告)日：1998-12-15
申请号：JP14489797
申请日：1997-06-03
申请人： HITACHI LTD , HITACHI SHIMIZU ENG KK
发明人： OISHI KENICHI , MARUYAMA HIROSHI
IPC分类号： F25B1/00
摘要： PROBLEM TO BE SOLVED: To obtain stable performance by suitably controlling a bypass circuit for supplying high temperature gas refrigerant into an accumulator to match to type of the refrigerant, thereby holding a suitable operating state. SOLUTION: At the time of starting an operation in a refrigerating cycle, liquid refrigerant might store in an accumulator 6. In this case, type of the refrigerant is judged according to data stored in an outdoor controller 9 by using a signal detected by a refrigerant detector 8a mounted at a lower part of the accumulator. Simultaneously, temperature detected by a temperature detector 8b is compared with a target temperature stored in the controller 9 according to the refrigerant type, and when the temperature of the lower part of the accumulator 6 is lower, a solenoid valve 7a for a bypass circuit is opened. Meanwhile, when the target temperature set according to the refrigerant type is lower, the valve 7a is closed. Thus, the refrigerant of liquid state is gasified, foaming or liquid compression is prevented, a suitable operation state is obtained, thereby attaining stable performance.

3. 发明专利

JPH10232056A AIR-CONDITIONING DEVICE 失效
公开(公告)号：JPH10232056A
公开(公告)日：1998-09-02
申请号：JP3620197
申请日：1997-02-20
申请人： HITACHI LTD , HITACHI SHIMIZU ENG KK
发明人： MATSUSHIMA HITOSHI , HAYASE ISAO , KOKUNI KENSAKU , HORIUCHI NORIAKI , IGARASHI YASUYUKI
IPC分类号： F25B1/00
摘要： PROBLEM TO BE SOLVED: To provide an air-conditioning device to keep an oil amount in respective compressors at a proper value, in a multitype air-conditioning device to connect together outdoor machines with a plurality of built-in external oil supply type compressors. SOLUTION: An air-conditioning device is formed such that oil output ports for oil return for oil separators 3A and 3B are formed in two spots, oil for external oil supply is outputted through a lower output port and surplus oil is outputted through an output port formed in a central part. After a flow of surplus oil through a common oil container 9, the surplus oil is returned to accumulators 5A and 5B. Further, by providing a function to control a return oil amount, a minimum oil amount of oil for supply oil to each part is ensured classified by each outdoor machine, and a balance of an oil amount between outdoor machines A and B is regulated by the surplus oil.

4. 发明专利

JPH10220353A SEMI-CLOSED TYPE SCREW COMPRESSOR 失效
公开(公告)号：JPH10220353A
公开(公告)日：1998-08-18
申请号：JP2474697
申请日：1997-02-07
申请人： HITACHI LTD , HITACHI SHIMIZU ENG KK
发明人： YANAGISAWA NAOHIRO , MOROHOSHI TSUNEJI , KIKUCHI SHOJI
IPC分类号： F04B39/00 , F04C18/16 , F04C23/00 , F04C29/00 , H02K11/00
摘要： PROBLEM TO BE SOLVED: To provide a semi-closed screw compressor having high reliability, in which much labor for maintenance work is reduced and a floor space occupied thereby requires small, and a water-proof refrigerator unit in which the screw compressor is mounted. SOLUTION: This semi-closed screw compressor is formed in a manner that an electric motor and a compressor mechanism part 1 comprising a pair of female and male screw rotors which is engaged with each other and rotated, are directly connected to each other and stored in a disassemble casing 7, and a power supply connecting terminal box 9 for the electric motor is mounted in a terminal structure having airtightness in which the conductor 13 of a stator 5 is connected to the casing 7. The power supply connecting terminal box 9 for the electric motor is formed to have a water-proof structure having water- tightness that a bare live part and an insulated live part are separated from the outside.

5. 发明专利

JPH109718A AIR CONDITIONER 失效
公开(公告)号：JPH109718A
公开(公告)日：1998-01-16
申请号：JP16558396
申请日：1996-06-26
申请人： HITACHI LTD , HITACHI SHIMIZU ENG KK
发明人： HORI SATOSHI , NAITO YASUHIRO , KAWAGUCHI HIROMI
IPC分类号： F25B1/00 , F25B41/00 , F25B41/06
摘要： PROBLEM TO BE SOLVED: To eliminate the need of particular provision of a pressure reduce by providing with a pressure reducing function a site-laid refrigerant piping connecting between an outdoor heat exchanger and an indoor heat exchanger. SOLUTION: In cooling operation, a four-way valve 2 is operated into a state where connection ports A and D, B and C thereof are interlly connected. High temperature high pressure refrigerant vapor discharged from the compressor 1 flows onto the outdoor heat exchanger 3 after passage through the connection ports A, D, and radiates heat to outdoor air sent form an outdoor fan 8. The refrigerant which has radiated the heat is condensed and liquefied into a liquid refrigerant, and enters a refrigerant liquid connection piping 4. Herein, the refrigerant liquid connection piping 4 is reduced in pressure under the indications that the piping 4 is provided with a pressure reducing function, and becomes a two phase flow of gas/liquid mixture. The low temperature low pressure refrigerant as the two phase flow is guided to an indoor machine, and enters an indoor heat exchanger 6 to effect heat exchange with indoor air sent from the indoor fan 9.

6. 发明专利

JPH109715A FREEZER 失效
公开(公告)号：JPH109715A
公开(公告)日：1998-01-16
申请号：JP16557696
申请日：1996-06-26
申请人： HITACHI LTD , HITACHI SHIMIZU ENG KK
发明人： TAKI KATSUHIKO , TAMAISHI KOJI
IPC分类号： F25B41/00 , F25B43/02
摘要： PROBLEM TO BE SOLVED: To eliminate the lowering of the life of freezing cycle parts and any cracks in a piping caused by an increase of discharge pressure pulsation by setting a connection position of each discharge piping as an oil separator. SOLUTION: Discharge pipings 3a, 3b from compressors 1a, 1b are each directly connected with an oil separator 9 without being gathered in the middle and are joined at a container of the oil separator 9. The oil separator 9 is a container having a comparatively large capacity, and an introduced high pressure gas refrigerant is reduced in pressure in the container. When there is produced pulsation on discharge pressure, a relation between the discharge pressures Pa, P of the discharge pipings 3a, 3b and the pressure P of the oil separator 9 satisfies an alternate repetition of Pa>Pb>P or Pb>Pa>P. There is a pressure difference due to pulsation between the pressures Pa and Pb, and there is the oil separator 9 between the Pa and Pb and hence the pressure P is lower than the Pa, Pb so that the Pa, Pb are discharged after passage through the oil separator 9 without reversely flowing. Thus, check valves 8a, 8b are not closed owing to a reverse flow, and there is eliminated a temporal increase of discharge pressure of the compressors 1a, 1b.

7. 发明专利

JPH109714A FREEZER 失效
公开(公告)号：JPH109714A
公开(公告)日：1998-01-16
申请号：JP16411896
申请日：1996-06-25
申请人： HITACHI LTD , HITACHI SHIMIZU ENG KK
发明人： SAKURAI TAKASHI , TOMITA RYOSUKE
IPC分类号： F25B39/04 , F25B40/02
摘要： PROBLEM TO BE SOLVED: To ensure stable operation where flash gas is not produced, and hence restrict lowering of freezing capability by more increasing the diameter of a heat transfer pipe of a supercooler of an air-cooling condenser than that of a condenser part. SOLUTION: There are constructed an apparatus with a condenser 1, a supercooler 2, a U pipe used in the condenser, and a U pipe 6 for supercooler using a larger size than the U pipe 5. High temperature high pressure gas discharged from a compressor heat exchanges through the condenser 1 into a liquid refrigerant, which enters the supercooler 2. Hererin, although the high temperature high pressure gas enters the inside of the condenser divided to several passages, it has, as compared with a condenser of an HCFC refrigerant, a more increased heat transfer area and a more increased number of paths in order to optimize an in-pipe flow velocity and ensure satisfactory condensation. The refrigerant satisfactorily liquefied by the condenser 1 is again collected to one header and is sent to the supercooler 2 having the larger diameter U pipe than the condenser 1.

8. 发明专利

JPH109178A OIL-COOLED PACKAGE TYPE AIR COMPRESSOR 失效
公开(公告)号：JPH109178A
公开(公告)日：1998-01-13
申请号：JP16557896
申请日：1996-06-26
申请人： HITACHI LTD , HITACHI SHIMIZU ENG KK
发明人： TODA MASAAKI , AOKI MASAKAZU , TAKADA YASUYUKI
IPC分类号： F04C29/04 , F04C29/02
摘要： PROBLEM TO BE SOLVED: To prevent the inflow of oil into a secondary separator element, and reduce the carryover of oil in an oil tank by providing a bottomless inner cylinder at the upper part in the oil tank and providing slits or holes for connecting the inside and the outside of the inner cylinder to each other. SOLUTION: An oil tank is constituted of a shell plate 8, an upper plate 9 and a bottom plate 10, and is provided with a cylinder 11 and an oil filler port 12. The inside 13 and the outside 14 of the cylinder 11 communicate with each other by slits or holes formed therethrough. The oil filler port 12 is arranged so as to overlap with the inner cylinder 11 to connecting the inside 13 and the outside 14 of the cylinder 11. The communication of the inside 13 and the outside 14 of the cylinder 11 of the oil tank with each other prevents the inflow of oil into a secondary separator elements to thereby improve the oil-separation efficiency thereof.

9. 发明专利

JPH09308919A BURRING DEVICE FOR TUBING 失效
公开(公告)号：JPH09308919A
公开(公告)日：1997-12-02
申请号：JP12478896
申请日：1996-05-20
申请人： HITACHI LTD , HITACHI SHIMIZU ENG KK
发明人： HARA EISUKE , KASUKABE KIMITO , KURAGANO MITSURU , KUNIKATA MASARU , SATO MINORU , TAKEUCHI TOSHIYUKI , MISU YUZO
IPC分类号： B21C37/29 , B21D19/08 , B21D28/10 , B21D28/28 , B21D35/00 , B21D37/12 , B21D51/16
摘要： PROBLEM TO BE SOLVED: To provide a burring device for executing the punching of a prepared hole and burring in one process and without deteriorating the accuracy in shape of a tubing. SOLUTION: This device is provided with a tube 2 whose outside diameter is formed smaller than the inside diameter of the tubing 1 and in a prescribed position of which a hole is formed in the radial direction, a rod 3 which is slidably supported in this tube 2 and at one end of which a slope 3a is provided, burring punch 4 which is arranged in the tube 2 so as to be movable in the radial direction, at one end of which a punch part 4b for punching the prepared hole is formed and at the other end of which the slope in contact with the slope 3a is formed, lower die 9 which is arranged movably in the radial direction of the tube 2 and a hole having the same diameter as the outside diameter of the burring part to be formed on the tubing 1 is formed, elastic die 11 on which the hole in which the punching part 4b for punching the prepared hole is fit is formed and which is mounted in the hole of the lower die and driving means for moving the lower die 9 to the tube 2.

10. 发明专利

JPH09289783A AIR CONDITIONER 失效
公开(公告)号：JPH09289783A
公开(公告)日：1997-11-04
申请号：JP9984496
申请日：1996-04-22
申请人： HITACHI LTD , HITACHI SHIMIZU ENG KK
发明人： HATA YOSHIKI , OISHI KENICHI
IPC分类号： F24F11/02 , H02M7/48 , H02P27/08 , H02P7/63
摘要： PROBLEM TO BE SOLVED: To attach a voltage type PWM converter circuit or a booster chopper circuit in a separate body for harmonics suppression only when a request arises in an air conditioner having an converter and an inverter circuit. SOLUTION: A terminal board 7 to connect a harmonics restricting device is provided between a converter circuit 6 and an inverter circuit 11; when connecting a booster chopper circuit 13, a short-circuit wire at the primary side of the terminal board 7 is removed, the input side of connected to a terminal corresponding to downstream wiring of a converter circuit 6, and the output side is connected to a terminal corresponding to upstream wiring of the inverter circuit 11, thereby forming a circuit corresponding to the harmonics. When connecting a voltage type PWM converter circuit, the input side is connected to the input terminal of the diode module 4 by tightening them together.

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