公开(公告)号：US20210108841A1

公开(公告)日：2021-04-15

申请号：US17110641

申请日：2020-12-03

Applicant: DENSO CORPORATION

Inventor： Kengo SUGIMURA ,  Satoshi ITO ,  Yuichi KAMI ,  Hiroyuki KOBAYASHI

IPC: F25B41/31 ,  F25B13/00 ,  F25B49/02

Abstract: A refrigerant cycle device includes a compressor, a radiator, a first expansion valve, a second expansion valve, a first evaporator, a second evaporator, and a controller. The controller is configured to switch between a first evaporator priority control and a second evaporator priority control. During the first evaporator priority control, the controller controls a throttle opening of the second expansion valve based on at least one of a temperature of a first evaporator, a temperature of a refrigerant flowing through the first evaporator, and a temperature of an air having exchanged heat in the first evaporator. During the second evaporator priority mode, the controller controls the throttle opening based on a refrigerant state of the second evaporator. When the at least one of the temperatures is equal to or greater than a switching temperature, the second priority mode is switched to the first priority mode.

公开(公告)号：US20210101451A1

公开(公告)日：2021-04-08

申请号：US17125387

申请日：2020-12-17

Applicant: DENSO CORPORATION

Inventor： Hiroyuki KOBAYASHI ,  Satoshi ITO ,  Yuichi KAMI ,  Kengo SUGIMURA

IPC: B60H1/32 ,  F25B49/02

Abstract: A first evaporator cools air-conditioning air. A second evaporator cools an object. A first orifice unit and a second orifice unit are capable of changing a refrigerant amount of the first evaporator and the second evaporator, respectively. A control unit controls both the first orifice unit and the second orifice unit so that a temperature of the second evaporator approaches a target temperature. The control unit, in a first mode, performs control not to evaporate a refrigerant at the first evaporator and to evaporate the refrigerant at the second evaporator. The control unit, in a second mode, performs control to evaporate the refrigerant at both the first evaporator and the second evaporator. The control unit sets the target temperature in a first mode higher than that in a second mode.

公开(公告)号：US20240271844A1

公开(公告)日：2024-08-15

申请号：US18642281

申请日：2024-04-22

Applicant: DENSO CORPORATION

Inventor： Yuichi KAMI ,  Kota TAKEICHI

IPC: F25B49/02 ,  F25B30/02 ,  F25B41/20

CPC classification number: F25B49/02 ,  F25B30/02 ,  F25B41/20 ,  F25B2400/04

Abstract: A heat pump cycle device includes a compressor, a branch part, a heating unit, a heating-unit side decompression unit, a bypass passage, a bypass flow rate adjustment unit, a mixing part, a target temperature determination part configured to determine a target temperature that is a target value of an object temperature of the heating object heated by the heating unit, and a target low-pressure determination part configured to determine a target low pressure that is a target value of a sucked refrigerant pressure of the refrigerant to be sucked into the compressor. When the object temperature is lower than the target temperature during execution of a hot gas mode, a high-pressure rise control is performed to raise a discharged refrigerant pressure of the refrigerant flowing into the heating unit.

公开(公告)号：US20210101450A1

公开(公告)日：2021-04-08

申请号：US17110086

申请日：2020-12-02

Applicant: DENSO CORPORATION

Inventor： Hiroyuki KOBAYASHI ,  Yuichi KAMI ,  Kengo SUGIMURA ,  Satoshi ITO

IPC: B60H1/32 ,  B60H1/04

Abstract: A refrigeration cycle device includes a compressor, a radiator, an air-conditioning heat exchanger, a cooling heat exchanger, an air-conditioning decompression unit, a cooler-unit decompression unit, a refrigerant flow rate detector, and a controller. The radiator is configured to radiate heat of refrigerant discharged from the compressor. The air-conditioning heat exchanger absorbs heat from air to evaporate the refrigerant. The cooling heat exchanger is arranged in parallel with the air-conditioning heat exchanger in the flow of refrigerant. The air-conditioning decompression unit adjusts a decompression amount of the refrigerant flowing into the air-conditioning heat exchanger. The cooler-unit decompression unit adjusts a decompression amount of the refrigerant flowing into the cooling heat exchanger. The controller controls the operation of the cooler-unit decompression unit so that the flow rate of the refrigerant detected by the refrigerant flow rate detector exceeds a predetermined reference flow rate.

公开(公告)号：US20180222287A1

公开(公告)日：2018-08-09

申请号：US15749514

申请日：2016-07-12

Applicant: DENSO CORPORATION

Inventor： Hiroshi MIEDA ,  Ryohei SUGIMURA ,  Masaaki KAWAKUBO ,  Yuichi KAMI

IPC: B60H1/22 ,  F25B1/10 ,  F25B13/00 ,  F25B39/04

CPC classification number: B60H1/22 ,  B60H1/00914 ,  B60H1/00921 ,  B60H2001/00928 ,  B60H2001/00957 ,  F25B1/10 ,  F25B6/02 ,  F25B13/00 ,  F25B25/005 ,  F25B39/04 ,  F25B40/00 ,  F25B41/04 ,  F25B43/006 ,  F25B2313/0233 ,  F25B2313/02741 ,  F25B2600/21 ,  F25B2600/2507

Abstract: A heat pump system includes a compressor that compresses and discharges a refrigerant, a decompressor that decompresses the refrigerant, an outdoor unit that exchanges heat between the refrigerant and an outside air, an evaporator that evaporates the refrigerant, a condenser that condenses the refrigerant, an internal heat exchanger, an accumulator that separates the refrigerant into a gas refrigerant and a liquid refrigerant, and a flow pathway changing portion. The internal heat exchanger includes a high-pressure passage through which a high-pressure refrigerant flows, and a low-pressure passage through which a low-pressure refrigerant flows, the internal heat exchanger exchanging heat between the refrigerant flowing through the high-pressure passage and the refrigerant flowing through the low-pressure passage. The flow pathway changing portion that switches between a cooling pathway and a heating pathway. According to this heat pump system, a cooling capacity and a heating capacity can be improved.

公开(公告)号：US20250115094A1

公开(公告)日：2025-04-10

申请号：US18986615

申请日：2024-12-18

Applicant: DENSO CORPORATION

Inventor： Tomoyuki NOMURA ,  Yuichi KAMI

IPC: B60H1/00

Abstract: A heat pump cycle apparatus includes a compressor, an upstream branch part, a heating unit, an outside air heat exchanger, an upstream decompression unit, a downstream decompression unit, a bypass passage, and a bypass-side flow rate adjusting unit. In a heating mode of heating a heating target, a refrigerant decompressed in the upstream decompression unit flows into the outside air heat exchanger, and the refrigerant is caused to absorb heat of outside air in the outside air heat exchanger. In a defrosting mode of removing frost on the outside air heat exchanger, one refrigerant branched at the upstream branch part is caused to flow into the outside air heat exchanger to dissipate heat, and the refrigerant decompressed at the downstream decompression unit and the refrigerant flowing out of the bypass-side flow rate adjusting unit are mixed and sucked into the compressor.

公开(公告)号：US20240369265A1

公开(公告)日：2024-11-07

申请号：US18773926

申请日：2024-07-16

Applicant: DENSO CORPORATION

Inventor： Daiki KATO ,  Norihiko ENOMOTO ,  Yuichi KAMI

IPC: F25B5/02 ,  F25B41/40 ,  F25B49/02

Abstract: A refrigeration cycle device includes first and second evaporation units connected in parallel to a flow of a refrigerant, and an accumulator. When a path of an energy flow in which heat of a first object to be cooled moves to a suction refrigerant drawn into a compressor is defined as a first path, and when a path of an energy flow in which heat of a second object to be cooled moves to the suction refrigerant is defined as a second path, the accumulator is disposed in at least one of the first path and the second path. Furthermore, the refrigeration cycle device is provided with a first switching unit switched such that heat of the first object to be cooled is moved while bypassing the accumulator, and a second switching unit switched such that heat of the second object to be cooled is moved while bypassing the accumulator.

公开(公告)号：US20210190389A1

公开(公告)日：2021-06-24

申请号：US17191487

申请日：2021-03-03

Applicant: DENSO CORPORATION

Inventor： Kazuhiro TADA ,  Kengo SUGIMURA ,  Hiroyuki KOBAYASHI ,  Yuichi KAMI ,  Satoshi ITO

IPC: F25B13/00 ,  F25B41/20

Abstract: The refrigeration cycle device includes a compressor, an outside heat exchanger, a cooling pressure reducing unit, an evaporator, a branch portion, a cool down pressure reducing unit, a temperature adjusting unit, a merging portion, a bypass passage, and a first on-off valve. The temperature adjusting unit includes a temperature adjusting heat exchange unit and adjusts a temperature of a temperature adjustment target object. During a cooling and cool down mode, the outside heat exchanger functions as a radiator, and the evaporator and the temperature adjusting heat exchange unit function as heat absorbers. During a target object warm up mode, the refrigerant discharged from the compressor is guided to the temperature adjusting heat exchange unit via the bypass passage, and the heat of the discharged refrigerant is used as a heat source for heating the temperature adjustment target object.

公开(公告)号：US20210088246A1

公开(公告)日：2021-03-25

申请号：US17111882

申请日：2020-12-04

Applicant: DENSO CORPORATION

Inventor： Yuichi KAMI ,  Kengo SUGIMURA ,  Mitsuo OOURA

IPC: F24F11/46 ,  F24F11/64 ,  F24F11/67 ,  F24F11/89 ,  G05B19/042

Abstract: An air conditioner includes a heat medium circuit, a refrigerant cycle device, a discharge capacity controlling section, a heat generation amount controlling section, a target temperature determining section, and an upper limit determining section. The heat medium circuit includes a heating heat exchanger and an electric heater. The refrigerant cycle device exchanges heat between a heat medium in the heat medium circuit and a refrigerant discharged from an electric compressor. During a heater priority mode, the rotational speed of the compressor is increased to reach an upper limit and a heating amount of the heater is increased as a temperature difference increases. During a compressor priority mode, the heating amount of the heater is decreased and the rotational speed is increased to compensate for a decreasing amount.

公开(公告)号：US20240401848A1

公开(公告)日：2024-12-05

申请号：US18801214

申请日：2024-08-12

Applicant: DENSO CORPORATION

Inventor： Haruyuki NISHIJIMA ,  Yuichi KAMI ,  Hiroshi MIEDA

IPC: F25B30/02

Abstract: A heat pump cycle device includes: a compressor; a branch portion; a heating unit configured to heat a heating object using one refrigerant branched at the branch portion as a heat source; a decompression unit configured to decompress the refrigerant flowing out of the heating unit; a bypass passage through which an another refrigerant branched at the branch portion flows; a regulating unit; and a joining portion. When a length of a suction-side flow path from an outlet port of the joining portion to a suction port of the compressor is defined as a suction-side flow path length L1, the suction-side flow path length L1 is equal to or longer than a relaxation distance Lv. The relaxation distance Lv is a flow length that is necessary for the refrigerant mixed in the joining portion to be made in a homogeneous state.