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公开(公告)号：US11920841B2
公开(公告)日：2024-03-05
申请号：US17428278
申请日：2019-03-25
Applicant: Mitsubishi Electric Corporation
Inventor： Shohei Ishimura , Soshi Ikeda , Kazuya Watanabe , Hideto Nakao , Masakazu Kondo , Yasuhide Hayamaru , Yusuke Tashiro , Masakazu Sato , Atsushi Kawashima
Abstract: An air-conditioning apparatus includes a main circuit in which a compressor, a flow switching device, an indoor heat exchanger, a pressure reducing device, and a plurality of parallel heat exchangers connected in parallel with each other are connected by pipes, a bypass pipe, a flow control device provided to the bypass pipe and configured to adjust a flow rate of refrigerant flowing through the bypass pipe, an evaporating pressure sensor configured to measure an evaporating pressure of the refrigerant, and a controller. The air-conditioning apparatus is configured to operate in a normal heating operation mode and a heating-defrosting operation mode. When an operation associated with the normal heating operation mode is switched to an operation associated with the heating-defrosting operation mode, the controller adjusts an opening degree of the flow control device using the evaporating pressure in the parallel heat exchanger and a driving frequency of the compressor.
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公开(公告)号：US11796212B2
公开(公告)日：2023-10-24
申请号：US17437834
申请日：2019-04-11
Applicant: Mitsubishi Electric Corporation
Inventor： Kazuya Watanabe , Shohei Ishimura , Koji Fukui , Kojiro Katayama , Kosuke Tanaka , Kazuki Okada , Kazushige Baba
IPC: F25B41/30 , F24F11/84 , F24F1/0068
CPC classification number: F24F11/84 , F24F1/0068
Abstract: An air-conditioning apparatus includes a controller configured to operate in a heating normal operation mode and a heating-defrosting operation mode. In a case of switching from the heating normal operation mode to the heating-defrosting operation mode, the controller makes a selection from an initial control mode 1, in which control is performed such that an initial frequency of the compressor is set to a predetermined maximum frequency and an initial opening degree of the flow control device is set to an opening degree lower than a predetermined maximum opening degree, and an initial control mode 2, in which control is performed such that the initial opening degree of the flow control device is set to the predetermined maximum opening degree and the initial frequency of the compressor is set to a frequency lower than the predetermined maximum frequency, to execute the heating-defrosting operation mode.
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公开(公告)号：US10415861B2
公开(公告)日：2019-09-17
申请号：US15571393
申请日：2016-03-28
Applicant: Mitsubishi Electric Corporation
Inventor： Naofumi Takenaka , Shinichi Wakamoto , Kazuya Watanabe , Naomichi Tamura , Tadashi Ariyama
Abstract: A controller switches between and performs a first simultaneous heating and defrosting operation of supplying part of refrigerant discharged from a compressor is supplied to one or some parallel heat exchangers among a plurality of parallel heat exchangers through a defrosting circuit and allowing the other one or more parallel heat exchangers to operate as evaporators, and a second simultaneous heating and defrosting operation of, in one or some heat source units among a plurality of heat source units, supplying the refrigerant discharged from the compressor is supplied to all the plurality of parallel heat exchangers through the defrosting circuit, and in the other one or more heat source units, continuing heating by allowing all the plurality of parallel heat exchangers to operate as evaporators.
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公开(公告)号：US11885518B2
公开(公告)日：2024-01-30
申请号：US17277330
申请日：2018-12-11
Applicant: MITSUBISHI ELECTRIC CORPORATION
Inventor： Koji Fukui , Kosuke Tanaka , Kazuya Watanabe
CPC classification number: F24F11/42 , F24F1/16 , F24F11/67 , F25B47/022 , F24F1/32 , F25B2313/0251 , F25B2313/0253 , F25B2313/02522 , F25B2313/02531 , F25B2313/02532 , F25B2313/02533 , F25B2313/0314 , F25B2313/0315 , F25B2347/021
Abstract: An air-conditioning apparatus includes a refrigerant circuit, an air-conditioning load state detection unit, an operation-state detection unit, and a controller. The refrigerant circuit includes a main circuit and a bypass circuit. The air-conditioning apparatus has a simultaneous heating and defrosting operation mode. In the simultaneous heating and defrosting operation mode, the controller controls a compressor, a pressure reducing device, and a defrosting refrigerant pressure-reducing device such that control amounts of the compressor, the pressure reducing device, and the defrosting refrigerant pressure-reducing device reach respective normal-time control target values that are set based on an air-conditioning load state and an operation state.
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公开(公告)号：US10808976B2
公开(公告)日：2020-10-20
申请号：US16088877
申请日：2016-05-16
Applicant: Mitsubishi Electric Corporation
Inventor： Kazuya Watanabe , Shinichi Wakamoto , Naofumi Takenaka , Naomichi Tamura , Tadashi Ariyama
IPC: F25B47/02 , F24F11/72 , F25B41/04 , F24F11/41 , F25B13/00 , F25B41/06 , F24F140/20 , F24F140/12 , F24F110/10
Abstract: An air-conditioning apparatus includes: a first defrosting pipe branching from a main circuit to supply a portion of refrigerant discharged from a compressor to one of plural parallel heat exchangers to be defrosted; a second defrosting pipe which returns, to the main circuit, the refrigerant supplied through the first defrosting pipe to the one parallel heat exchanger; a first expansion device provided on the first defrosting pipe; a second expansion device provided on the second defrosting pipe to adjust a pressure of the refrigerant in the one parallel heat exchanger; and a third expansion device provided between a connection point between an outlet of the second defrosting pipe and the main circuit and one of plural indoor heat exchangers functioning as an evaporator, to adjust a pressure of the refrigerant in the one of the indoor heat exchangers; and a controller that controls the second and third expansion devices individually.
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Patent Agency Ranking
公开(公告)号：US10465968B2
公开(公告)日：2019-11-05
申请号：US14894151
申请日：2013-05-31
Applicant: Mitsubishi Electric Corporation
Inventor： Naofumi Takenaka , Shinichi Wakamoto , Kazuya Watanabe , Koji Yamashita , Takeshi Hatomura
Abstract: An air-conditioning apparatus includes: a compressor allowing refrigerant injection thereto and compress and discharge the refrigerant at a high temperature; an indoor heat exchanger exchanging heat between air and refrigerant; a first flow rate control device adjusting and controlling a flow rate of refrigerant; and a plurality of outdoor heat exchangers being in parallel to exchange heat between outside air and refrigerant, a first defrosting pipe allowing a branched part of the refrigerant discharged from the compressor to pass and flow into the outdoor heat exchanger to be defrosted; a reducing device adjusting a pressure of refrigerant passing through the first defrosting pipe to a medium pressure; a second defrosting pipe from which the refrigerant having passed through the outdoor heat exchanger to be defrosted is injected into the compressor; and a reducing device adjusting a pressure of refrigerant passing through the second defrosting pipe to an injection pressure.
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公开(公告)号：US12209761B2
公开(公告)日：2025-01-28
申请号：US18517574
申请日：2023-11-22
Applicant: Mitsubishi Electric Corporation
Inventor： Koji Fukui , Kosuke Tanaka , Kazuya Watanabe
Abstract: An air-conditioning apparatus includes a refrigerant circuit and a controller. The refrigerant circuit includes a main circuit and a bypass circuit. The bypass circuit is connected, by a pipe, to each of a plurality of parallel outdoor heat exchangers via a defrosting refrigerant pressure-reducing device, a defrosting flow passage switching device, and a backflow prevention device. The controller switches a flow passage for use in introduction of refrigerant using the defrosting flow passage switching device, to select one of the plurality of parallel outdoor heat exchangers as a defrosting target to be defrosted; and supplies defrosting refrigerant whose pressure is reduced by the defrosting refrigerant pressure-reducing device to the selected one of the plurality of parallel outdoor heat exchangers.
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公开(公告)号：US12163681B2
公开(公告)日：2024-12-10
申请号：US17915481
申请日：2020-05-14
Applicant: Mitsubishi Electric Corporation
Inventor： Kazuya Watanabe , Shohei Ishimura , Mizuo Sakai
Abstract: An air-conditioning apparatus includes a compressor, an outdoor fan, and a controller configured to perform a fan intermittent operation for causing the outdoor fan to run and stop repeatedly after the compressor stops. The controller is configured to, in the fan intermittent operation, in a case where the outdoor fan is running and there is no snow accumulation on the outdoor fan, change a stop upper limit time for the outdoor fan depending on a running time of the outdoor fan in the fan intermittent operation and cause the outdoor fan to stop running after changing the stop upper limit time for the outdoor fan. The controller is configured to, in a case where a stop time of the outdoor fan exceeds the changed stop upper limit time, cause the outdoor fan to run.
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公开(公告)号：US10508826B2
公开(公告)日：2019-12-17
申请号：US15541062
申请日：2015-01-13
Applicant: Mitsubishi Electric Corporation
Inventor： Naofumi Takenaka , Shinichi Wakamoto , Kazuya Watanabe , Naomichi Tamura , Tadashi Ariyama , Koji Yamashita , Takeshi Hatomura
Abstract: An air-conditioning apparatus includes a selection unit and a determination unit, the selection unit selecting a reverse-defrosting operation mode or a heating-defrosting simultaneous operation mode, the reverse-defrosting operation mode being a mode in which all of parallel heat exchangers are defrosted by stopping a heating operation, the heating-defrosting simultaneous operation mode being a mode in which each parallel heat exchanger is sequentially defrosted while continuing a heating operation, the determination unit determining whether or not a defrosting operation is to be started, in which the determination unit is configured to start the defrosting operation in a state where the amount of frost deposited on the parallel heat exchangers is smaller in a case where the heating-defrosting simultaneous operation mode is selected than in a case where the reverse-defrosting operation is selected.
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公开(公告)号：US11268743B2
公开(公告)日：2022-03-08
申请号：US16642085
申请日：2018-03-07
Applicant: Mitsubishi Electric Corporation
Inventor： Kazuya Watanabe , Soshi Ikeda , Shohei Ishimura , Hideto Nakao
Abstract: An air-conditioning apparatus includes a main circuit in which a compressor, a load side heat exchanger, a first pressure reducing device, and a plurality of parallel heat exchangers connected in parallel with each other are connected by pipes, a bypass pipe diverting a portion of refrigerant discharged by the compressor, a flow switching unit connecting a parallel heat exchanger to be defrosted to the bypass pipe, a plurality of flow rate control devices controlling flow rates of refrigerant flowing through the plurality of parallel heat exchangers, and a controller which controls, in the heating-defrosting operation mode or in the heating operation mode after execution of the heating-defrosting operation mode, the flow rate control devices to control, in accordance with a frost state of a parallel heat exchanger functioning as an evaporator among the plurality of parallel heat exchangers, the flow rate of refrigerant flowing through the parallel heat exchanger.
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