Patents by Inventor Hidekazu Tani
Hidekazu Tani has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).
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Publication number: 20230065130Abstract: An air conditioning system includes: a heat source unit; an indoor unit; a water circuit configured by connecting a supply pipe and a return pipe; a flow rate adjusting valve provided in the water circuit; a supply air temperature control unit configured to adjust a flow rate of the flow rate adjusting valve; a pump provided in the water circuit; a pump controller configured to control a rotation speed of the pump; a return water temperature sensor; a supply water temperature sensor; a supply water temperature control unit; and a target supply water temperature updating unit configured to change a target supply water temperature to which a supply water temperature detected by the supply water temperature sensor is to reach based on a temperature difference between a return water temperature detected by the return water temperature sensor and the supply water temperature.Type: ApplicationFiled: March 15, 2021Publication date: March 2, 2023Inventors: Mamoru HAMADA, Hayato HORIE, Hidekazu TANI, Guido DACCO
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Patent number: 7984620Abstract: An air conditioning apparatus has plural indoor units having: plural heat exchangers; and flow controllers respectively corresponding to the heat exchangers. In each of the indoor units, one heat exchanger is used as a condenser, and another heat exchanger is used as an evaporator, thereby causing the indoor unit to perform a temperature and humidity controlling operation. An indoor unit(s) which is not set to perform the temperature and humidity controlling operation may be caused to perform a heating operation or a cooling operation. Capacity controls on the condensers and the evaporators are performed by corresponding flow controllers. Gas refrigerants ejected from plural heat exchangers serving as evaporators are joined together, and then distributed to plural heat exchangers serving as condensers.Type: GrantFiled: April 23, 2008Date of Patent: July 26, 2011Assignee: Mitsubishi Denki Kabushiki KaishaInventors: Daisuke Shimamoto, Munehiro Yamanaka, Hidekazu Tani, Tomohiko Kasai, Masahiro Tsuda, Shuji Oura, Makoto Saitou
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Patent number: 7493775Abstract: An air conditioning apparatus has plural indoor units having: plural heat exchangers; and flow controllers respectively corresponding to the heat exchangers. In each of the indoor units, one heat exchanger is used as a condenser, and another heat exchanger is used as an evaporator, thereby causing the indoor unit to perform a temperature and humidity controlling operation. An indoor unit(s) which is not set to perform the temperature and humidity controlling operation may be caused to perform a heating operation or a cooling operation. Capacity controls on the condensers and the evaporators are performed by corresponding flow controllers. Gas refrigerants ejected from plural heat exchangers serving as evaporators are joined together, and then distributed to plural heat exchangers serving as condensers.Type: GrantFiled: October 30, 2002Date of Patent: February 24, 2009Assignee: Mitsubishi Denki Kabushiki KaishaInventors: Daisuke Shimamoto, Munehiro Yamanaka, Hidekazu Tani, Tomohiko Kasai, Masahiro Tsuda, Shuji Oura, Makoto Saitou
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Publication number: 20080196432Abstract: An air conditioning apparatus has plural indoor units having: plural heat exchangers; and flow controllers respectively corresponding to the heat exchangers. In each of the indoor units, one heat exchanger is used as a condenser, and another heat exchanger is used as an evaporator, thereby causing the indoor unit to perform a temperature and humidity controlling operation. An indoor unit(s) which is not set to perform the temperature and humidity controlling operation may be caused to perform a heating operation or a cooling operation. Capacity controls on the condensers and the evaporators are performed by corresponding flow controllers. Gas refrigerants ejected from plural heat exchangers serving as evaporators are joined together, and then distributed to plural heat exchangers serving as condensers.Type: ApplicationFiled: April 23, 2008Publication date: August 21, 2008Applicant: MITSUBISHI DENKI KABUSHIKI KAISHAInventors: Daisuke SHIMAMOTO, Munehiro Yamanaka, Hidekazu Tani, Tomohiko Kasai, Masahiro Tsuda, Shuji Oura, Makoto Saitou
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Publication number: 20060254294Abstract: An air conditioning apparatus has plural indoor units having: plural heat exchangers; and flow controllers respectively corresponding to the heat exchangers. In each of the indoor units, one heat exchanger is used as a condenser, and another heat exchanger is used as an evaporator, thereby causing the indoor unit to perform a temperature and humidity controlling operation. An indoor unit(s) which is not set to perform the temperature and humidity controlling operation may be caused to perform a heating operation or a cooling operation. Capacity controls on the condensers and the evaporators are performed by corresponding flow controllers. Gas refrigerants ejected from plural heat exchangers serving as evaporators are joined together, and then distributed to plural heat exchangers serving as condensers.Type: ApplicationFiled: October 30, 2002Publication date: November 16, 2006Applicant: MITSUBISHI DENKI KABUSHIK KAISHAInventors: Daisuke Shimamoto, Munehiro Yamanaka, Hidekazu Tani, Tomohiko Kasai, Masahiro Tsuda, Shuji Oura, Makoto Saitou
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Patent number: 6510698Abstract: A heat source unit and refrigerant used in an existing refrigeration system are replaced with new refrigerant and a new heat source unit which employs the new refrigerant and is equipped with an oil separator and extraneous-matter trapping device. An indoor unit of the existing refrigeration system may be used, in its present form, or replaced with a new indoor unit. Further, connecting pipes used for the existing refrigeration are reused. After replacement of refrigerant, the refrigeration system performs an ordinary operation after having performed a cleaning operation. The extraneous-matter trapping device is provided in a refrigerant pipe close to the heat source unit or in a bypass channel connected to the refrigerant pipe close to the heat source unit. Alternatively, only the heat source unit of the existing refrigeration system is replaced with a new one, and there is employed refrigeration oil which has no mutual solubility with respect to HFC or has very low mutual solubility.Type: GrantFiled: May 17, 2000Date of Patent: January 28, 2003Assignee: Mitsubishi Denki Kabushiki KaishaInventors: Tomohiko Kasai, Mitsunori Kurachi, Hidekazu Tani, Moriya Miyamoto, Yoshihiro Sumida, Takashi Ikeda, Toshihiro Kikukawa, Shohichiroh Masuda, Hirofumi Koge
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Publication number: 20020026800Abstract: A heat source unit and refrigerant used in an existing refrigeration system are replaced with new refrigerant and a new heat source unit which employs the new refrigerant and is equipped with an oil separator and extraneous-matter trapping means. An indoor unit of the existing refrigeration system may be used, in its present form, or replaced with a new indoor unit. Further, connecting pipes used for the existing refrigeration are reused. After replacement of refrigerant, the refrigeration system performs an ordinary operation after having performed a cleaning operation. The extraneous-matter trapping means is provided in a refrigerant pipe close to the heat source unit or in a bypass channel connected to the refrigerant pipe close to the heat source unit. Alternatively, only the heat source unit of the existing refrigeration system is replaced with a new one, and there is employed refrigeration oil which has no mutual solubility with respect to HFC or has very low mutual solubility.Type: ApplicationFiled: May 17, 2000Publication date: March 7, 2002Inventors: Tomohiko Kasai, Mitsunori Kurachi, Hidekazu Tani, Moriya Miyamoto, Yoshihiro Sumida, Takashi Ikeda, Toshihiro Kikukawa, Shohichiroh Masuda, Hirofumi Koge
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Patent number: 6032473Abstract: A refrigerant circulation system of the present invention includes a compressor, a condenser, a evaporator, a throttle device and a control unit. The control unit controls a composition of a refrigerant circulating in the refrigerant circulation system based on a temperature and pressure of the refrigerant of an inlet and outlet portion of the compressor, condenser, evaporator and throttle device. The control unit controls to open and close the throttle device to change the composition of the refrigerant circulating in the refrigerant circulation system.Type: GrantFiled: October 24, 1997Date of Patent: March 7, 2000Assignee: Mitsubishi Denki Kabushiki KaishaInventors: Osamu Morimoto, Fujio Hitomi, Moriya Miyamoto, Hidekazu Tani, Tomohiko Kasai, Yoshihiro Sumida, Hitoshi Iijima
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Patent number: 5987907Abstract: A refrigerant circulation system of the present invention includes a compressor, a condenser, a evaporator, a throttle device and a control unit. The control unit controls a composition of a refrigerant circulating in the refrigerant circulation system based on a temperature and pressure of the refrigerant of an inlet and outlet portion of the compressor, condenser, evaporator and throttle device. The control unit controls to open and close the throttle device to change the composition of the refrigerant circulating in the refrigerant circulation system.Type: GrantFiled: July 23, 1996Date of Patent: November 23, 1999Assignee: Mitsubishi Denki Kabushiki KaishaInventors: Osamu Morimoto, Fujio Hitomi, Moriya Miyamoto, Hidekazu Tani, Tomohiko Kasai, Yoshihiro Sumida, Hitoshi Iijima
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Patent number: 5388422Abstract: An air conditioning system in which a single heat source unit (A) comprising a compressor (1), a four-way valve (2), a heat source unit side heat exchanger (3) and an accumulator (4) is connected to a plurality of indoor units (B, C, D) through a first and a second connection pipes (6, 7). Each indoor unit (B, C, D) comprises a suction air temperature detecting device (50) for detecting a suction air temperature of the indoor unit, an opening degree setting device for setting a minimum valve opening degree of the first flow rate controller 9 in accordance with the difference between the target temperature and the suction air temperature and a first valve opening degree control device (52) for controlling the valve opening degree of the first flow rate controller 9 at a predetermined rate to the minimum valve opening degree.Type: GrantFiled: March 24, 1993Date of Patent: February 14, 1995Assignee: Mitsubishi Denki Kabushiki KaishaInventors: Noriaki Hayashida, Takashi Nakamura, Hidekazu Tani, Tomohiko Kasai, Junichi Kameyama, Shigeo Takata
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Patent number: 5347826Abstract: A multi-chamber heat-pump type air conditioner in which a plurality of room units (2, 3, 4) are connected to one heat source unit (1), cooling and heating can be effected selectively for each room unit (2, 3, 4), and cooling can be effected by one room unit and heating can be simultaneously effected by another, wherein the high-level pressure or low-level pressure is controlled from rising high as compared to the time of normal operation, and the reliability of the compressor (17) is improved. In which, a third pressure-detector (48) is provided for detecting a rise in pressure between a compressor (17) and a four-way changeover valve (18), and a control circuit (49) is provided for controlling such that, in the event that the pressure within the pipe is below a predetermined pressure, a sixth valve (45) and a seventh valve (46) are closed, while in the event that the pressure within the pipe exceeds the predetermined pressure, the sixth valve (45) and seventh valve (46) are opened.Type: GrantFiled: May 27, 1993Date of Patent: September 20, 1994Assignee: Mitsubishi Denki Kabushiki KaishaInventors: Noriaki Hayashida, Hidekazu Tani, Takashi Nakamura
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Patent number: 5309733Abstract: An air conditioning system in which a single heat source unit (A) comprising a compressor (1), a four-way valve (2), a heat source unit side heat exchanger (3) and an accumulator (4) is connected to a plurality of indoor units (B, C, D) through a first and a second connection pipes (6, 7). Each indoor unit (B, C, D) comprises a suction air temperature detecting device (50) for detecting a suction air temperature of the indoor unit, an opening degree setting device for setting a minimum valve opening degree of the first flow rate controller 9 in accordance with the difference between the target temperature and the suction air temperature and a first valve opening degree control device (52) for controlling the valve opening degree of the first flow rate controller 9 at a predetermined rate to the minimum valve opening degree. A bypass system is further provided to enable an effective defrost operation.Type: GrantFiled: March 24, 1993Date of Patent: May 10, 1994Assignee: Mitsubishi Denki Kabushiki KaishaInventors: Noriaki Hayashida, Takashi Nakamura, Hidekazu Tani, Tomohiko Kasai, Junichi Kameyama, Shigeo Takata
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Patent number: 5297392Abstract: An air conditioning apparatus which includes a single heat source device and plural indoor units including indoor heat exchangers. Some of the indoor units include a fan for introducing outdoor air, while others include a fan for circulating indoor air. In addition, a controller is provided for controlling operation of one or more of the indoor units to carry out heating, cooling or ventilation in response to a determination of the operation of one or more other indoor units.Type: GrantFiled: May 8, 1992Date of Patent: March 29, 1994Assignee: Mitsubishi Denki Kabushiki KaishaInventors: Shigeo Takata, Hidekazu Tani, Takashi Nakamura, Noriaki Hayashida, Tomohiko Kasai, Junichi Kameyama
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Patent number: 5237833Abstract: An air conditioning system in which a single heat source unit (A) comprising a compressor (1), a four-way valve (2), a heat source unit side heat exchanger (3) and an accumulator (4) is connected to a plurality of indoor units (B, C, D) through a first and a second connection pipes (6, 7) Each indoor unit (B, C, D) comprises a suction air temperature detecting device (50) for detecting a suction air temperature of the indoor unit, an opening degree setting device for setting a minimum valve opening degree of the first flow rate controller 9 in accordance with the difference between the target temperature and the suction air temperature and a first valve opening degree control device (52) for controlling the valve opening degree of the first flow rate controller 9 at a predetermined rate to the minimum valve opening degree.Type: GrantFiled: December 30, 1991Date of Patent: August 24, 1993Assignee: Mitsubishi Denki Kabushiki KaishaInventors: Noriaki Hayashida, Takashi Nakamura, Hidekazu Tani, Tomohiko Kasai, Junichi Kameyama, Shigeo Takata
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Patent number: 5156014Abstract: An air conditioning apparatus comprising: a single heat source device including a compressor, a reversing valve, an outdoor heat exchanger and an accumulator; a plurality of indoor units including indoor heat exchangers and first flow controllers; a first main pipe and a second main pipe for connecting between the heat source device and the indoor units; a first branch joint which can selectively connect one end of the indoor heat exchanger of each indor unit to either one of the first main pipe and the second main pipe; a second branch joint which is connected to the other end of the indoor heat exchanger of each indoor unit through the first flow controllers, and which is also connected to the second main pipe through a second flow controller; the first branch joint and the second branch joint being connected together through the second flow controller; the second branch joint being connected to the first main pipe through a fourth flow controller; a junction device which includes the first branch joint, thType: GrantFiled: April 18, 1991Date of Patent: October 20, 1992Assignee: Mitsubishi Denki Kabushiki KaishaInventors: Takashi Nakamura, Hidekazu Tani, Tomohiko Kasai, Shigeo Takata
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Patent number: 5142879Abstract: An air conditioning system for multiple rooms, comprising:an outdoor unit including a variable delivery compressor, a four way reversing valve and an outdoor heat exchange unit;two main connecting pipes composed of a high pressure main pipe and a low pressure main pipe to connect between outdoors and indoors;a distribution controller which is connected to the main connecting pipes to divide them into a high pressure pipe, a low pressure pipe and a medium pressure pipe therein;a plurality of indoor units which include indoor heat exchangers, respectively, which are one end connected to the medium pressure pipe through electronic expansion valves, respectively, and which are the other end selectively connected to either one of the high pressure pipe and the low pressure pipe, respectively;detecting means for detecting either one of refrigerant temperatures and refrigerant pressures; andcontrol means for carrying out a predetermimed control based on such detection.Type: GrantFiled: March 19, 1991Date of Patent: September 1, 1992Assignee: Mitsubishi Denki Kabushiki KaishaInventors: Takashi Nakamura, Tomohiko Kasai, Hidekazu Tani, Shigeo Takata, Fumio Matsuoka
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Patent number: 5063752Abstract: An air conditioning apparatus comprises a single heat source device including a compressor, a reversing valve, an outdoor heat exchanger and an accumulator; a plurality of indoor units including indoor heat exchangers and first flow controllers; a first main pipe and a second main pipe for connecting between the heat source device and the indoor units, the first main pipe having a greater diameter than the second main pipe, a first branch joint which can selectively connect one end of the indoor heat exchanger of each indoor unit to either one of the first main pipe and the second main pipe; a second branch joint which is connected to the other end of the indoor heat exchanger of each indoor unit through the first flow controllers, and which is also connected to the second main pipe through a second flow controller; the first branch joint and the second branch joint being connected together through the second flow controller; a junction device which includes the first branch joint, the second flow controllerType: GrantFiled: October 5, 1990Date of Patent: November 12, 1991Assignee: Mitsubishi Denki Kabushiki KaishaInventors: Takashi Nakamura, Hidekazu Tani, Tomohiko Kasai
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Patent number: 4912937Abstract: An air conditioning apparatus comprises a switching valve for switching the flowing direction of a refrigerant discharged from a compressor to carry out either cooling operation, heating operation or defrosting operation; an outdoor heat exchanger for receiving the refrigerant supplied by the compressor through the switching valve to make the refrigerant heat exchange with air to be heat exchanged; an indoor heat exchanger for making the refrigerant heat exchange with a fluid to be heat exchanged; an oil separator which is arranged in a discharging side refrigerant pipe connecting the switching valve and the discharge port of the compressor to separate the refrigerant and a refrigerating machine oil which are discharged from the compressor; a first and second accumulators which are connected in series in an intake side refrigerant pipe connecting the switching valve and the intake port of the compressor; a first bypass passage for connecting the oil separator and the second accumulator through a solenoid valvType: GrantFiled: March 17, 1989Date of Patent: April 3, 1990Assignee: Mitsubishi Denki Kabushiki KaishaInventors: Takashi Nakamura, Kouji Ishikawa, Yoshinobu Igarashi, Hidekazu Tani
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Patent number: 4765149Abstract: A refrigeration cycle apparatus comprises first and second compressors, a four-way valve, an outdoor heat exchanger, first and second expansion means, at least one indoor heat exchanger, an accumulator, a refrigerant circuit connecting these element in order, a reservoir connected to the accumulator through an overflow pipe and a refrigerant supplying pipe with a first solenoid valve and a feeding pipe with a second solenoid valve for connecting the inlet side of the expansion means to the reservoir, wherein the first and second solenoid valves are opened and closed depending on operational conditions in a refrigeration cycle.Type: GrantFiled: July 30, 1987Date of Patent: August 23, 1988Assignee: Mitsubishi Denki Kabushiki KaishaInventors: Takashi Shiga, Hidekazu Tani, Hiroaki Hama, Hitoshi Iijima