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1. 发明专利

DE69725069D1 未知
公开(公告)号：DE69725069D1
公开(公告)日：2003-10-30
申请号：DE69725069
申请日：1997-07-14
申请人： HITACHI LTD
发明人： KATOU KOUJI , INOUE TORU , ISHII MAKOTO , TAKAKURA YUHACHI , NOTOHARA YASUO , KAWABATA YUKIO , SHINOZAKI HIROSHI , NAKAMURA HIROO , TAKAKU SHOJI , MORIMOTO MOTOO
IPC分类号： F04C29/00 , H02M1/00 , H02M1/10 , H02M1/42 , H02P4/00 , H02J1/02 , H02P7/01
摘要： For achieving an air conditioner being applicable to various a-c source voltages in common and operative with high power factor by suppressing generation of high harmonics, an a-c source voltage from an a-c electric power source 1 is rectified in full-wave by a rectifier 2, and a d-c source voltage Ed of an inverter 13 is obtained by being charged in a condenser 5. Here, there are a-c source voltages of 100 V and 200 V, and a divided voltage Ed1 of the d-c voltage of the condenser 5 is selected when the a-c source voltage is 100 V, a divided voltage Ed2 (here, Ed1 > Ed1) of the d-c voltage of the condenser 5 is selected when the a-c source voltage is 200 V, respectively by an exchange switch 18, and is used as a d-c voltage Ed' for controlling on and off of a switch element 6. Though the d-c source voltage Ed differs depending on the a-c source voltage of 100 V or 200 V, it is possible to set the d-c source voltage Ed at a voltage value for operating the inverter 13 with low loss and high efficiency, for each one of the a-c source voltages, by setting a ratio of the voltage division appropriately.

2. 发明专利

JPH11316041A AIR CONDITIONER 失效
公开(公告)号：JPH11316041A
公开(公告)日：1999-11-16
申请号：JP37396898
申请日：1998-12-28
申请人： HITACHI LTD
发明人： KATO KOJI , NAKAMURA HIROO , TAKAKU SHOJI , MORIMOTO MOTOO , ISHII MAKOTO
IPC分类号： H02M7/217 , F24F11/02 , F25B1/00 , H02M3/155 , H02M7/12 , H02M7/48 , H02P27/08
摘要： PROBLEM TO BE SOLVED: To provide an air conditioner decreasing a power loss in an inverter and improving efficiency. SOLUTION: A compressor-driving motor 14 is controlled with variable numbers of revolutions by PAM (Pulse Amplitude Modulation) control, and a condensing pressure is allowed to lower by providing an indoor auxiliary heat exchanger on a downstream side of an indoor heat exchanger of a refrigerant flow route at a time of heating operation. When a number of revolutions of the motor 14 is less than a specified number of revolutions, the motor 14 is driven by an output voltage from chopper-controlled electric current of an on-period of a second switch element, and when a number of revolutions of the motor 14 is more than the specified number of revolutions, the output voltage is determined in compliance with a number of revolutions by controlling an on-off duty factor of a first switch element 6, and the motor 14 is driven by the output voltage having 100% of the duty factor in the on-period of the second switch element.

3. 发明专利

JPH102638A HEAT EXCHANGER AND SLIT FIN 失效
公开(公告)号：JPH102638A
公开(公告)日：1998-01-06
申请号：JP15519696
申请日：1996-06-17
申请人： HITACHI LTD
发明人： TAKAKU SHOJI , KOGURE HIROSHI , NAKAMURA HIROO
IPC分类号： F28F1/32 , F25B39/04 , F28D1/047
摘要： PROBLEM TO BE SOLVED: To efficiently increase the degree of supercooling by disposing vicinity of a tube having least number of passes in a refrigerant outlet direction of a condenser at a windward side of an air main flow direction, providing a slit for interrupting thermal conduction at a fin between the refrigerant tube and an adjacent tube of a leeward side, and separating them in a thermally conducting manner. SOLUTION: A crossfin tube type heat exchanger has many fins 1 and a tube group 3 penetrating the fins 1. When the exchanger is operated as a condenser, high temperature gas refrigerant is distributed by a branch tube 5, combined by a confluent tube 6, and then fed in the exchanger for a predetermined section to become a supercooled state, and arrived at an exit of the exchanger. At this time, a slit 8 for separating tubes of windward and leeward sides with respect to an air main flow direction 2 is disposed at the windward side at a minimum pass part 7 in a condenser exit direction to thereby increase the degree of supercooling. The number of passes is reduced near the exchanger exit to thereby increase the refrigerant flowing velocity and further increasing the degree of supercooling.

4. 发明专利

JPH0960990A AIR-CONDITIONER 失效
公开(公告)号：JPH0960990A
公开(公告)日：1997-03-04
申请号：JP22142795
申请日：1995-08-30
申请人： HITACHI LTD
发明人： TAKAKU SHOJI , KOGURE HIROSHI , ISHII MAKOTO , TERAI TOSHIYUKI
IPC分类号： F24F11/02 , F25B1/00
摘要： PROBLEM TO BE SOLVED: To smooth the flow of working fluid and to reduce incurring of the pressure loss of working fluid by a method wherein a check valve to prevent the reverse flow of the working fluid from the compressor side to the vaporizer side and control is executed in such a manner that the number of revolutions of a compressor is reduced by an inverter when operation of the compressor is stopped. SOLUTION: The operation state of a compressor is of a system wherein the number of revolutions of the compressor is reduced in such a manner that the reduction ratio of the number of revolutions of the compressor per unit time is kept at a constant value between a point A after the stop of air- conditioning operation and a point B wherein operation of the compressor is stopped. As noted above, by controlling the number of revolutions of a compressor, the reverse flow of working fluid during the stop of the compressor is prevented from occurring. Further, rupture of an electric circuit due to the reverse flow of working fluid and the generation of noise and vibration during the stop of the compressor can be reduced.

5. 发明专利

JPH07113555A AIR CONDITIONER 失效
公开(公告)号：JPH07113555A
公开(公告)日：1995-05-02
申请号：JP25967793
申请日：1993-10-18
申请人： HITACHI LTD
发明人： KUDO MITSUO , FUKUSHIMA TOSHIHIKO , ITO MASAAKI , UCHIDA MARI , MATSUSHIMA HIROAKI , KOGURE HIROSHI , TAKAKU SHOJI
IPC分类号： F24F1/00 , F25B1/00 , F25B5/00 , F25B5/02 , F25B6/02 , F25B9/00 , F25B13/00 , F25B39/00 , F25B39/02 , F25B47/02
摘要： PURPOSE:To prevent a decrease in heating capacity at the time of a low atmospheric temperature even with non-azeotrope refrigerant by disposing part of a first refrigerant channel group at a windward side, setting a channel sectional area of the first channel smaller than that of a second refrigerant channel group, and setting a ratio of the first channel larger at an outdoor heat exchanger than that of an indoor heat exchanger. CONSTITUTION:A heat transfer tube 9a of a first refrigerant channel group is connected to a heat transfer tube 9b of a second refrigerant channel group via a T-shaped distributor 11. The tube 9a of the first group connected to a main tube 11a of the distributor 11 is disposed partly at a windward side, and a sectional area of the refrigerant channel is set to 1/2 of the tube 9b of the second channel having two refrigerant circuits connected to a branch tube 11b. Further, a ratio of the tube 9a of the first group to gross number of the tubes is set to larger than that at an outdoor heat exchanger as compared with an indoor heat exchanger 5. Thus, an extreme increase in pressure loss is suppressed to remarkably improve heating capacity at the time of a low atmospheric temperature.

6. 发明专利

JP2002081803A AIR CONDITIONER 失效
公开(公告)号：JP2002081803A
公开(公告)日：2002-03-22
申请号：JP2000278662
申请日：2000-09-08
申请人： HITACHI LTD
发明人： FUJIBAYASHI ICHIRO , IMOTO TSUTOMU , INAGAKI NOBUO , TAKAKU SHOJI , NAKAMURA HIROO
IPC分类号： F25B1/00 , F25B43/00
摘要： PROBLEM TO BE SOLVED: To provide a gas liquid separator being excellent in gas liquid separation performance in the case a gas injection cycle is formed. SOLUTION: In a small air conditioner for a domestic use etc, the diameter of the cylinder body of the gas liquid separation cylinder is set to 40-55 mm and a ratio between the inner cross section of a refrigerant chamber and the inner cross section of a refrigerant pipe is set to 12-20. This constitution enables improvement of separation performance of the gas liquid separator and improvement of COP (capacity/input) of the air conditioner.

7. 发明专利

JP2000064991A AIR-CONDITIONER 失效
公开(公告)号：JP2000064991A
公开(公告)日：2000-03-03
申请号：JP23811598
申请日：1998-08-25
申请人： HITACHI LTD
发明人： TAKADA YOSHIHIRO , HAKAMAYA NOBUSUKE , YOSHINAGA SHINYA , YOKOYAMA HIDENORI , MORIMOTO MOTOO , HAMADA SUSUMU , MURAYAMA MASAMI , TAKAKU SHOJI
IPC分类号： F04D29/38 , F04D29/66
摘要： PROBLEM TO BE SOLVED: To reduce the generation of noise, to improve strength, and to prevent the occurrence of unevenness in a vane mounting angle by a method wherein the maximum value of the chord length of a propeller fan being the electric fan of a heat-exchange part is positioned at the outer peripheral part of the fan and the fan6 outer peripheral part is protruded to the pressure surface side, and the outer peripheral part is moved backward to the negative pressure surface side. SOLUTION: A propeller fan 5 is formed that vanes 2 are disposed at a boss 1. In this case, since an outer peripheral protrusion part 3 protruding from a pressure surface at the tip of the vane 2 has a given curvature, the protrusion part is moved backward to a negative pressure surface after protrusion. The vane shape of a part wherein a fan outer peripheral end formed that it is moved backward to the negative pressure surface side at an outer peripheral part and a fan front edge cross each other is changed in a manner to protrude toward the pressure surface side. Further, a maximum outside diameter part is arranged further near the front edge side than the central part (, for example, 50% of a chord flare) of the vane. The outside diameter D21 is set to a value, for example, 3% or more higher than an outside diameter D23. This constitution increases an air volume without increasing the generation of noise.

8. 发明专利

JPH11132587A AIR CONDITIONER 失效
公开(公告)号：JPH11132587A
公开(公告)日：1999-05-21
申请号：JP29669097
申请日：1997-10-29
申请人： HITACHI LTD
发明人： TAKAKU SHOJI , KOGURE HIROSHI , OTSUKA ATSUSHI , IMOTO TSUTOMU , NAKAMURA HIROO , ENDO KAZUHIRO
IPC分类号： F25B13/00
摘要： PROBLEM TO BE SOLVED: To enhance heating performance by reducing heat loss when high temperature refrigerant delivered from the compressor in an air conditioner passes through a four-way valve. SOLUTION: A refrigerant branch tube 6 is employed in the way of piping between the refrigerant delivery side of a compressor 1 to a four-way valve 2. A bypath 7 having one end coupled with the four-way valve 2 and the other end opening to the way of piping between the four-way valve 2 and an indoor heat exchanger 3 during heating operation is provided. The air conditioner has such a cycle as heat exchange does not take place between high and low temperature refrigerants in the fourway valve 2 during heating operation.

9. 发明专利

JPH10246455A INDOOR DEVICE OF AIR CONDITIONER 失效
公开(公告)号：JPH10246455A
公开(公告)日：1998-09-14
申请号：JP4814497
申请日：1997-03-03
申请人： HITACHI LTD
发明人： KOGURE HIROSHI , TAKAKU SHOJI , KOIKE TADAO , OTSUKA ATSUSHI , SAKAMOTO TOKUICHIRO , KUDO MITSUO , UEDA HIROSHI
IPC分类号： F24F1/00
摘要： PROBLEM TO BE SOLVED: To provide a small-sized compact structure of an indoor device of an air conditioner in which a high heat exchanging efficiency is attained and an energy efficiency (=capability/input) is increased. SOLUTION: A heat exchanger in an indoor device of an air conditioner is constructed such that an upper slant rear surface side heat exchanger 4a, an upper slant front surface side heat exchanger 4b and a flat plate-like front surface side heat exchanger 4c are mounted around a blower 3 to form an inverse-V shape. In addition, in these heat exchangers 4a, 4b and 4c, slits Sa, Sb and Sc are formed at the central part of an arrangement of pipes acting as refrigerant passages and they are thermally separated into at least the upstream side and a downstream side. During a cooling operation, the refrigerant is flowed in sequence from the upstream side of the upper slant rear surface side heat exchanger 4a to its downstream side, from the upstream side of the upper slant front surface side heat exchanger 4b to its downstream side and then from the upstream side of the front surface heat exchanger 4c to its downstream side, thereby the heat exchanger side constructed to have opposing flows of refrigerant and air so as to improve heat exchanging performance.

10. 发明专利

JPH10153341A AIR CONDITIONER 失效
公开(公告)号：JPH10153341A
公开(公告)日：1998-06-09
申请号：JP31036596
申请日：1996-11-21
申请人： HITACHI LTD
发明人： KUDO MITSUO , HATADA TOSHIO , NAKAMURA HIROO , WATABE YOSHITO , KOGURE HIROSHI , TAKAKU SHOJI , MORIMOTO YASUO , TAKADA YOSHIHIRO
IPC分类号： F24F13/30
摘要： PROBLEM TO BE SOLVED: To upgrade a suction air velocity by improving the layout structure of a heat exchanger and enhance the performance of an air conditioner with regard to an air conditioner indoor unit. SOLUTION: In an air conditioner provided with a heat exchanger unit which comprises a sub-heat exchanger 6 separately provided on the weather side of a rear surface heat exchanger 5B laid out between an air inlet 4B at the upper part of an indoor unit 20 and a reflux fan, the rear surface heat exchanger 5B and one end side of the sub-heat exchanger laid out on the weather side thereof are arranged to approach each other while the multi-end sides are separated from each other, thereby providing a V-shaped clearance surrounded by the rear surface heat exchanger 5B, the sub-heat exchanger 6 and a side wall 2A on the rear surface side of a casing.

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