Patents by Inventor Fumitake Unezaki

Fumitake Unezaki 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).

  • Patent number: 10907911
    Abstract: A first heat exchanger, a desiccant block, and a second heat exchanger are arranged in series. Further, in a dehumidifying operation, a first operation mode and a second operation mode are alternately repeated. In the first operation mode, the first heat exchanger is operated as a condensor or a radiator and the second heat exchanger is operated as an evaporator. In the second operation mode, the first heat exchanger is operated as the evaporator and the second heat exchanger is operated as the condensor or the radiator. Further, an interval between fin surfaces of a plurality of fins in each of the first heat exchanger and the second heat exchanger is set to 1.5 mm to 3.0 mm so that drainage performance for dew condensation on the fin surfaces is enhanced to reduce an amount of the dew condensation stagnating on the fin surfaces and increase a dehumidifying amount.
    Type: Grant
    Filed: April 24, 2013
    Date of Patent: February 2, 2021
    Assignee: Mitsubishi Electric Corporation
    Inventors: Shinichi Ito, Fumitake Unezaki, Mamoru Hamada
  • Patent number: 10648684
    Abstract: On the basis of a detection result obtained by a pre-presence-in-room environment detection means, an air-conditioning apparatus A changes a presence-in-room start set temperature Ts serving as a target temperature at the start time of a precooling operation or a preheating operation and at the presence-in-room start scheduled time of the user.
    Type: Grant
    Filed: July 12, 2013
    Date of Patent: May 12, 2020
    Assignee: Mitsubishi Electric Corporation
    Inventors: Shinichi Ito, Fumitake Unezaki, Mamoru Hamada
  • Patent number: 10422547
    Abstract: An air-conditioning apparatus includes refrigerant systems that each include an outdoor unit and indoor units and that air-condition a single room, and circulators for making a temperature distribution in the room uniform. The air-conditioning apparatus determines a load on each of the two refrigerant systems in operation, and, if it is determined that improvement of operating efficiency is possible on the basis of the determination result, performs a system-selective operation in which operation of one of the refrigerant systems determined to be under a low load is stopped and the other refrigerant system determined to be under a high load is selectively performed, and causes the circulators to transport blown air blown from the indoor units of the refrigerant system determined to be under a high load to an air-conditioned zone of the refrigerant system determined to be under a low load.
    Type: Grant
    Filed: May 14, 2013
    Date of Patent: September 24, 2019
    Assignee: Mitsubishi Electric Corporation
    Inventors: Mamoru Hamada, Fumitake Unezaki, Hitoshi Kikuchi, Shigeki Onishi, Naoto Ariyoshi, Naomichi Tamura, Kazunobu Nishimiya
  • Patent number: 10222115
    Abstract: Provided are a refrigeration cycle that is formed by connecting a compressor, a condenser, expansion means, and an evaporator and that performs cooling operation; an evaporator heating device that heats the evaporator; a drain pan that receives drain-water from the evaporator and drains the drain-water; a drain-pan heating device that heats the drain pan; frost detecting means including a light-emitting element that emits light to the evaporator and a light-receiving element that receives reflected light from the evaporator and outputs a voltage according to the reflected light; and a control device that controls on-off operation of the evaporator heating device and the drain-pan heating device. The control device determines a frosting condition on the evaporator from an output of the frost detecting means and individually controls the evaporator heating device and the drain-pan heating device in accordance with the determination result.
    Type: Grant
    Filed: November 23, 2016
    Date of Patent: March 5, 2019
    Assignee: Mitsubishi Electric Corporation
    Inventors: Mamoru Hamada, Fumitake Unezaki, Akira Morikawa, Satoshi Ueyama, Koji Yamashita, Hiroyuki Morimoto, Yuji Motomura, Tetsuya Yamashita, Yusuke Otsubo
  • Patent number: 10151505
    Abstract: A mode selection unit selects a continuous operation mode when a dehumidifying operation is started. When an indoor temperature is less than or equal to a set first temperature threshold and indoor humidity is greater than a set humidity threshold in the continuous operation mode, the mode selection unit selects an intermittent operation mode. When the indoor temperature is less than or equal to a set second temperature threshold that is greater than the first temperature threshold and the indoor humidity is less than or equal to the set humidity threshold in the intermittent operation mode, the mode selection unit selects an operation stop mode.
    Type: Grant
    Filed: December 19, 2013
    Date of Patent: December 11, 2018
    Assignee: Mitsubishi Electric Corporation
    Inventors: Yasutaka Ochiai, Fumitake Unezaki, Makoto Saito, Kiyoshi Yoshimura, Ryoji Abe
  • Patent number: 10113763
    Abstract: A refrigeration cycle apparatus Including a refrigerant circuit configured to circulate refrigerant to a compressor, an indoor heat exchanger, an expansion valve, and an outdoor heat exchanger, the compressor being connected to the indoor heat exchanger by a gas extension pipe, the expansion valve being connected to the outdoor heat exchanger by a liquid extension pipe; pressure sensors and temperature sensors to detect an operating state amount of the refrigerant circuit; and a controller to execute refrigerant-leakage detection operation of detecting refrigerant leakage by calculating a refrigerant amount in the refrigerant circuit based on the operating state amount detected by the pressure sensors and the temperature sensors, and comparing the calculated refrigerant amount with a reference refrigerant amount. The controller controls a quality of the refrigerant at an outlet of the liquid extension pipe to be in a range from 0.1 to 0.7 in the refrigerant-leakage detection operation.
    Type: Grant
    Filed: July 10, 2013
    Date of Patent: October 30, 2018
    Assignee: Mitsubishi Electric Corporation
    Inventors: Yasutaka Ochiai, Fumitake Unezaki, Makoto Saito, Kazuhiro Komatsu, Junji Hori
  • Patent number: 10088211
    Abstract: A controller of an air-conditioning apparatus includes an operation control unit that controls operation of a compressor of a heat source unit based on target indoor temperatures of rooms, an unoccupied room detecting unit that detects an unoccupied room where no person is present among the rooms, and a correction amount setting unit that sets a temperature correction amount for correcting the target indoor temperature in a room controller of the unoccupied room detected by the unoccupied room detecting unit to reduce an air conditioning load for the unoccupied room. After the target indoor temperature is corrected by using the temperature correction amount in the room controller, when the operation capacity of the compressor controlled by the operation control unit is smaller than or equal to a preset operation capacity, the correction amount setting unit resets the temperature correction amount to be decreased by an adjustment amount.
    Type: Grant
    Filed: November 8, 2013
    Date of Patent: October 2, 2018
    Assignee: Mitsubishi Electric Corporation
    Inventors: Fumitake Unezaki, Shinichi Ito
  • Patent number: 10082325
    Abstract: A refrigerating apparatus includes: a refrigerating circuit in which a refrigerant that is discharged from a compressor is conveyed under pressure sequentially to a first flow rate controlling apparatus, a heat storing tank, a condenser, a first decompressing apparatus, and an evaporator, and is recycled to the compressor; a defrosting circuit in which the refrigerant that is discharged from the compressor is conveyed under pressure sequentially to the first flow rate controlling apparatus, the heat storing tank, the first decompressing apparatus, and the evaporator, and is recycled to the compressor; and a flow channel switching apparatus that connects an outlet side of the heat storing tank to an inlet side of the condenser or to an inlet side of the first decompressing apparatus to form the refrigerating circuit or the defrosting circuit.
    Type: Grant
    Filed: September 10, 2013
    Date of Patent: September 25, 2018
    Assignee: Mitsubishi Electric Corporation
    Inventors: Makoto Saito, Fumitake Unezaki
  • Patent number: 10060643
    Abstract: In an air-conditioning system, during precooling or preheating control, a setting temperature is controlled such that a first temperature difference between the setting temperature and an indoor temperature is not less than a temperature difference at which a compressor performs operation, and the setting temperature is controlled to be changed to a target temperature when a second temperature difference between the indoor temperature and the target temperature is less than the first temperature difference. Since the compressor can be operated in the range from a low capacity to a medium capacity, operation efficiency of the air-conditioning apparatus can be increased, and the energy-saving operation with less power consumption can be realized. Since the operation capacity of the compressor can be readily suppressed with adjustment of the setting temperature, control is facilitated and the precooling control can be incorporated in various types of air-conditioning apparatuses.
    Type: Grant
    Filed: May 13, 2013
    Date of Patent: August 28, 2018
    Assignee: Mitsubishi Electric Corporation
    Inventors: Emi Takeda, Shinichi Ito, Fumitake Unezaki, Mamoru Hamada, Toshiaki Yoshikawa, Takashi Matsumoto, Hirotoshi Yano
  • Patent number: 10006649
    Abstract: An air-conditioning system is configured to determine an evaporating temperature control range of a first refrigerant circuit on the basis of the temperature of outdoor air, control an evaporating temperature of the first refrigerant circuit to a target evaporating temperature determined within the evaporating temperature control range of the first refrigerant circuit, determine an evaporating temperature control range of a second refrigerant circuit on the basis of the humidity of the outdoor air, and control an evaporating temperature of the second refrigerant circuit to a target evaporating temperature determined within the evaporating temperature control range of the second refrigerant circuit.
    Type: Grant
    Filed: March 5, 2013
    Date of Patent: June 26, 2018
    Assignee: Mitsubishi Electric Corporation
    Inventors: Mamoru Hamada, Fumitake Unezaki, Naomichi Tamura, Kazunobu Nishimiya, Hidemoto Arai
  • Patent number: 9951962
    Abstract: A heat pump heating and hot-water system includes a water heating heat exchanger for heating water by heat exchange with a heating medium heated by a heat pump unit, an indoor heating unit, a heating circulation circuit for selectively pumping the heating medium to either of the water heating heat exchanger and the indoor heating unit using a heating medium pump, and a hot-water accumulating circuit that sends water in a hot-water storage tank to the water heating heat exchanger and returns water having passed through the water heating heat exchanger to the hot-water storage tank using a water pump. The volumetric flow rate of the heating medium pumped to the water heating heat exchanger by the heating medium pump is higher than or equal to the volumetric flow rate of the water pumped to the water heating heat exchanger by the water pump.
    Type: Grant
    Filed: December 6, 2011
    Date of Patent: April 24, 2018
    Assignee: Mitsubishi Electric Corporation
    Inventors: Shogo Tamaki, Makoto Saito, Fumitake Unezaki, Nobuaki Uehara
  • Patent number: 9920969
    Abstract: Provided is an oil level detection device to be mounted on a refrigerating and air-conditioning apparatus, the oil level detection device being configured to detect an oil level of oil accumulated inside a compressor forming the refrigerating and air-conditioning apparatus. The oil level detection device includes an oil level detection unit installed on an outer surface of the compressor and configured to detect a temperature of an installation position, a sensor output unit configured to output, to the refrigerating and air-conditioning apparatus, a signal for changing an operation state of the refrigerating and air-conditioning apparatus, and a determination unit configured to determine depletion of the oil accumulated inside the compressor based on measurement values obtained by the oil level detection unit at least after an output of the signal to be output from the sensor output unit.
    Type: Grant
    Filed: September 9, 2014
    Date of Patent: March 20, 2018
    Assignee: Mitsubishi Electric Corporation
    Inventors: Yasutaka Ochiai, Fumitake Unezaki
  • Patent number: 9880043
    Abstract: A liquid level detection device at least includes a heating member that heats a container, a temperature measurement element disposed on a side of the heating member opposite to the container, a thermal conductor disposed between the heating member and the container, an elastic body that presses the heating member with a certain amount of force, a terminals for supplying power to the heating member, a fixture that covers the heating member, the temperature measurement element, the thermal conductor, the elastic body and the terminals and mount those on the container, wherein the heating member does not come into contact with the terminals when at least one of the thermal conductor and the fixture is inappropriately mounted on a container.
    Type: Grant
    Filed: May 21, 2013
    Date of Patent: January 30, 2018
    Assignee: Mitsubishi Electric Corporation
    Inventors: Yasutaka Ochiai, Makoto Saito, Fumitake Unezaki
  • Patent number: 9874360
    Abstract: Maximum evaporating temperature setting values and minimum evaporating temperature setting values in an indoor heat exchanger and a ventilator cooler are determined in accordance with outdoor air temperature and humidity, evaporating temperature setting values in the indoor heat exchanger and the ventilator cooler are set to be between the respective maximum evaporating temperature setting values and the respective minimum evaporating temperature setting values, and evaporating temperatures in the indoor heat exchanger and the ventilator cooler are controlled so as to be the respective evaporating temperature setting values.
    Type: Grant
    Filed: May 14, 2013
    Date of Patent: January 23, 2018
    Assignee: Mitsubishi Electric Corporation
    Inventors: Mamoru Hamada, Fumitake Unezaki, Naomichi Tamura, Kazunobu Nishimiya, Hidemoto Arai
  • Patent number: 9829238
    Abstract: A first heat exchanger, a desiccant block, and a second heat exchanger are arranged in series. In a dehumidification operation, a first operation mode in which the first heat exchanger acts as a condenser or a radiator and the second heat exchanger acts as an evaporator and a second operation mode in which the first heat exchanger acts as an evaporator and the second heat exchanger acts as a condenser or a radiator are alternately repeated.
    Type: Grant
    Filed: October 16, 2012
    Date of Patent: November 28, 2017
    Assignee: MITSUBISHI ELECTRIC CORPORATION
    Inventors: Fumitake Unezaki, Shinichi Ito
  • Patent number: 9829231
    Abstract: A refrigeration cycle apparatus includes low-pressure side pressure detecting means for detecting the pressure of a refrigerant being sucked by a compressor, suction refrigerant temperature detecting means for detecting the temperature of the refrigerant being sucked by the compressor, frequency detecting means for detecting the operation frequency of the compressor, cooling target fluid inflow temperature detecting means for detecting the temperature of a cooling target fluid flowing in an evaporator, cooling target fluid outflow temperature detecting means for detecting the temperature of the cooling target fluid flowing out of the evaporator, and flow rate calculating means (measuring unit, computing unit, and storage unit) for calculating the absolute quantity of the flow rate of the cooling target fluid flowing in the evaporator using a value detected by each detecting means.
    Type: Grant
    Filed: October 4, 2011
    Date of Patent: November 28, 2017
    Assignee: Mitsubishi Electric Corporation
    Inventors: Koji Fukui, Fumitake Unezaki, Makoto Saito
  • Patent number: 9822988
    Abstract: A dehumidifying apparatus controls the amount of refrigerant flowing into a third heat exchanger serving as a condenser, so as to secure the amount of heat required for defrosting.
    Type: Grant
    Filed: April 10, 2013
    Date of Patent: November 21, 2017
    Assignee: Mitsubishi Electric Corporation
    Inventors: Shinichi Ito, Fumitake Unezaki, Mamoru Hamada
  • Publication number: 20170307248
    Abstract: An air-conditioning apparatus includes refrigerant systems that each include an outdoor unit and indoor units and that air-condition a single room, and circulators for making a temperature distribution in the room uniform. The air-conditioning apparatus determines a load on each of the two refrigerant systems in operation, and, if it is determined that improvement of operating efficiency is possible on the basis of the determination result, performs a system-selective operation in which operation of one of the refrigerant systems determined to be under a low load is stopped and the other refrigerant system determined to be under a high load is selectively performed, and causes the circulators to transport blown air blown from the indoor units of the refrigerant system determined to be under a high load to an air-conditioned zone of the refrigerant system determined to be under a low load.
    Type: Application
    Filed: July 12, 2017
    Publication date: October 26, 2017
    Inventors: Mamoru HAMADA, Fumitake UNEZAKI, Hitoshi KIKUCHI, Shigeki ONISHI, Naoto ARIYOSHI, Naomichi TAMURA, Kazunobu NISHIMIYA
  • Patent number: 9677799
    Abstract: A refrigeration and air-conditioning apparatus rapidly varies the pressure or the temperature inside a liquid reserve container to identify a liquid level position inside the liquid reserve container on the basis of the surface temperature of the liquid reserve container.
    Type: Grant
    Filed: May 28, 2013
    Date of Patent: June 13, 2017
    Assignee: Mitsubishi Electric Corporation
    Inventors: Yasutaka Ochiai, Makoto Saito, Fumitake Unezaki
  • Patent number: 9651282
    Abstract: An air-conditioning system includes a pump that sends, to an evaporator, a cooling fluid that exchanges heat with a refrigerant at the evaporator, and a first heat exchanger that exchanges heat between ambient air and the cooling fluid that has undergone the heat exchange at the evaporator. A sensible heat exchange cycle is formed by annularly connecting the evaporator, the heat exchanger, and the pump by using a pipe. This system is also includes an air-sending unit that sends air to a second heat exchanger, moisture absorbing-and-desorbing devices that are provided at a passage of the air sent by the air-sending unit and that are disposed in front of and behind the first heat exchanger, and an air-path switching device that reverses a passing direction of air passing through the moisture absorbing-and-desorbing device, the first heat exchanger, and the moisture absorbing-and-desorbing device.
    Type: Grant
    Filed: October 28, 2011
    Date of Patent: May 16, 2017
    Assignee: Mitsubishi Electric Corporation
    Inventors: Shinichi Ito, Fumitake Unezaki, Mamoru Hamada