-
公开(公告)号：US20230213253A1
公开(公告)日：2023-07-06
申请号：US17788888
申请日：2021-09-13
Applicant: NEC Corporation
Inventor： Takashi OHTSUKA , Koichi Todoroki , Yoshinori Miyamoto , Masaki Chiba , Mahiro Hachiya , Minoru Yoshikawa
CPC classification number: F25B49/02 , F25B43/006 , F25B2600/13 , F25B2700/2109 , F25B2700/19 , F25B2600/2501 , F25B2400/23
Abstract: A cooling device using a refrigeration cycle in which a refrigerant is circulated through a heat receiver, a compressor, a heat radiator, and an expansion valve includes: a gas-liquid separator configured to perform gas-liquid separation on the refrigerant supplied from the expansion valve; a pump configured to send a liquid phase refrigerant separated by the gas-liquid separator to the heat receiver; and a control unit configured to control opening and closing of a refrigerant flow path of the refrigeration cycle, and an operation and stop of the compressor and the pump, wherein the control unit starts the operation of the pump on condition that a net positive suction head of the pump has reached a predetermined value or more.
-
公开(公告)号：US11343946B2
公开(公告)日：2022-05-24
申请号：US16479630
申请日：2017-03-30
Applicant: NEC Corporation
Inventor： Arihiro Matsunaga , Koichi Todoroki , Hisato Sakuma , Minoru Yoshikawa
Abstract: A cooling system including a vaporizer configured to absorb heat due to a liquid-phase refrigerant being vaporized, a condenser configured to discharge heat due to a refrigerant in a gaseous phase state being liquefied, a resistance body provided in a middle of a pipe passage ranging from the vaporizer to the condenser and applying a resistance to the refrigerant, state detection sensors provided in the pipe passage on an upstream and downstream sides of the resistance body and detecting a state of the refrigerant flowing through each side inside the pipe passage, and a flow rate controller configured to detect droplets in the refrigerant flowing through the pipe passage on the basis of a difference between detection values of the state detection sensors which are detected on the upstream and downstream sides of the resistance body, and controls a flow rate of the refrigerant on the basis of detection results.
-
公开(公告)号：US11226130B2
公开(公告)日：2022-01-18
申请号：US16477935
申请日：2018-01-09
Applicant: NEC CORPORATION
Inventor： Koichi Todoroki , Arihiro Matsunaga , Masanori Sato , Mizuki Wada , Minoru Yoshikawa
Abstract: A valve control device includes a receiving unit, an opening degree control unit, and a fixing control unit. The receiving unit receives information concerning the measured temperature of a fluid to be cooled that is cooled by a vaporizer in a refrigerant circulation path that is equipped with the vaporizer and a condenser. The opening degree control unit variably controls the opening degree of a valve that controls the flow rate of the refrigerant that circulates through the circulation path in accordance with the difference between the measured temperature and a target temperature provided in advance. The fixing control unit fixes the opening degree of the valve with priority over variable control performed by the opening degree control unit in the case where a fixing condition based on the difference between the measured temperature and the target temperature and a valve opening degree variation condition is satisfied.
-
Patent Agency Ranking
公开(公告)号：US11428442B2
公开(公告)日：2022-08-30
申请号：US16975918
申请日：2019-03-19
Applicant: NEC Corporation
Inventor： Hisato Sakuma , Koichi Todoroki , Masaki Chiba , Takafumi Natsumeda , Minoru Yoshikawa
Abstract: A cooling device includes a first evaporation unit, a second evaporation unit, a first condensation unit, a second condensation unit, common piping, a compressor, an expansion valve, a first valve, and a second valve. The common piping combines liquid-phase refrigerant flowing from the first condensation unit and liquid-phase refrigerant flowing from the second condensation unit. The first valve adjusts the liquid-phase refrigerant amount flowing into the first evaporation unit. The second valve adjusts the liquid-phase refrigerant amount flowing into the second evaporation unit. In addition, the pressure inside the common pipe is greater than the respective pressures inside the first evaporation unit and the second evaporation unit.
-
公开(公告)号：US20240255201A1
公开(公告)日：2024-08-01
申请号：US17789312
申请日：2021-08-19
Applicant: NEC Corporation
Inventor： Takashi OHTSUKA , Koichi Todoroki , Yoshinori Miyamoto , Masaki Chiba , Mahiro Hachiya , Minoru Yoshikawa
CPC classification number: F25B49/02 , F25B13/00 , F25B2700/1933
Abstract: An object of the present invention is to prevent cavitation in a refrigerant pump from occurring due to a decrease in a net positive suction head in a cooling device.
A cooling device of the present invention is a cooling device using a refrigeration cycle in which a refrigerant is circulated through a heat receiver (1), a compressor (2), a heat radiator (3), and an expander (4), and includes a tank (5) that separates the refrigerant supplied from the expander (4) into a gas phase refrigerant and a liquid phase refrigerant, a pump (6) that sends the liquid phase refrigerant separated in the tank (5) to the heat receiver (1), and a control unit (7) that controls the amount of increase in pressure of the compressor 2 in the refrigeration cycle, and the control unit (7) increases the pressure of the compressor (2) in a limited range in which the value of the net positive suction head of the pump (6) does not fall below a predetermined value.-
公开(公告)号：US11683912B2
公开(公告)日：2023-06-20
申请号：US17398208
申请日：2021-08-10
Applicant: NEC Corporation
Inventor： Kenji Kobayashi , Koichi Todoroki , Nirmal Singh Rajput , Yoshinori Miyamoto , Masaki Chiba , Minoru Yoshikawa
IPC: H05K7/20
CPC classification number: H05K7/20745 , H05K7/20145
Abstract: A cooling device includes: a duct that guides air that has absorbed heat generated inside a cooling target and has been discharged, to the cooling target; a cooler that is provided in the duct and cools the air flowing inside the duct; and an adjusting mechanism that is located on a downstream side of the cooler, adjusts an amount of the air discharged from the duct into a room where the cooling target is installed.
-
公开(公告)号：US11614288B2
公开(公告)日：2023-03-28
申请号：US16923615
申请日：2020-07-08
Applicant: NEC Corporation
Inventor： Koichi Todoroki , Minoru Yoshikawa , Masaki Chiba
IPC: F24F13/30 , F28F9/02 , H05K7/20 , F28F1/10 , F24F1/0063 , F24F1/0323
Abstract: A heat exchanger has a structure in which a heat exchanger main body through which coolant flows is obliquely installed in a box-shaped enclosure, the heat exchanger main body is constituted by a header pipe and a plurality of heat transfer pipes connected to the header pipe and disposed at predetermined intervals along a surface of a part of the header pipe, the header pipe has an area adjacent to an inner surface of the enclosure, and a seal section is provided between the inner surface of the enclosure and the area of the header pipe adjacent to the enclosure.
-
公开(公告)号：US11105566B2
公开(公告)日：2021-08-31
申请号：US16498073
申请日：2017-03-30
Applicant: NEC Corporation
Inventor： Koichi Todoroki , Arihiro Matsunaga , Minoru Yoshikawa
Abstract: The present invention provides a heat exchanger including a lower header into which a liquid-phase refrigerant flows, a plurality of heat exchange pipes which branch off from the lower header and extend upwards, and an upper header which is configured to collect refrigerant received by the heat exchange pipes, in which a refrigerant inlet of the lower header is provided with a flow passage resistance adjusting hole having a cross-section smaller than a flow passage cross-section of a pipe passage for supplying the refrigerant.
-
-
-
-
-
-
-
Search Results
8
records
(took 0.013 seconds)
