Patents by Inventor Minoru Yoshikawa

Minoru Yoshikawa 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).

  • Publication number: 20220192057
    Abstract: A local cooler includes: a housing formed into a box shape; a heat exchanger provided along a slope extending upward to a rear portion from a lower position located on the front side of the housing; a first intake/exhaust port provided on a front surface of the housing; a second intake/exhaust port provided on a bottom surface of the housing; third intake/exhaust ports provided at a plurality of locations among side surfaces, upper surface and rear surface of the housing; and a closing plate capable of selectively shielding these intake/exhaust ports.
    Type: Application
    Filed: April 13, 2020
    Publication date: June 16, 2022
    Applicant: NEC Corporation
    Inventors: Koichi TODOROKI, Minoru YOSHIKAWA, Kunihiko ISHIHARA, Masaki CHIBA, Yoshinori MIYAMOTO, Takafumi NATSUMEDA, Nirmal Singh RAJPUT
  • Patent number: 11363744
    Abstract: When an enclosed space is formed, by at least one of surfaces forming an exterior shape of a shielding member and an intake or exhaust surface among surfaces forming an exterior shape of heat-generating housings, in such a way that a taken-in airflow and an exhausted airflow of the heat-generating housings installed in at least two rows can be separated or substantially separated, a cooling system includes: a duct formed to be able to separate or substantially separate a first airflow and a second airflow being intake/exhaust of a specific heat-generating housing among the heat-generating housings, and heat-generating housings other than the specific heat-generating housing, respectively; and a cooling enhancement unit enhancing cooling for the specific heat-generating housing by acting on the first airflow, thereby avoiding occurrence of a hot spot due to a high-heat-generating housing, in a system building an air-conditioning environment such as aisle capping.
    Type: Grant
    Filed: September 6, 2017
    Date of Patent: June 14, 2022
    Assignee: NEC CORPORATION
    Inventors: Minoru Yoshikawa, Hisato Sakuma, Yoshinori Miyamoto, Masaki Chiba
  • Patent number: 11343946
    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.
    Type: Grant
    Filed: March 30, 2017
    Date of Patent: May 24, 2022
    Assignee: NEC CORPORATION
    Inventors: Arihiro Matsunaga, Koichi Todoroki, Hisato Sakuma, Minoru Yoshikawa
  • Publication number: 20220154988
    Abstract: A liquid separator including a cylindrical closed container in which a refrigerant is stored, a refrigerant inflow pipe that allows the refrigerant to flow into the closed container, and a refrigerant outflow pipe that allows the vapor-phase refrigerant in a space inside the closed container to flow out, in which the refrigerant inflow pipe and the refrigerant outflow pipe are each connected from the upper part of the closed container toward the inside thereof, and the closed container has a short cylindrical shape in which the height is smaller relative to the diameter.
    Type: Application
    Filed: March 6, 2020
    Publication date: May 19, 2022
    Applicant: NEC Corporation
    Inventors: Takafumi NATSUMEDA, Masaki CHIBA, Koichi TODOROKI, Minoru YOSHIKAWA
  • Publication number: 20220146167
    Abstract: A cooling apparatus includes a heat receiver that evaporates a low pressure heat transfer medium; a compressor that compresses the evaporated heat transfer medium in a gas phase state, a condenser that condenses the compressed heat transfer medium, a receiver tank that receives and stores at least one of the heat transfer medium from any place in a flow path of the heat transfer medium in the gas phase state that returns the heat transfer medium to the heat receiver and the condensed heat transfer medium in a liquid phase state, an air storage tank that introduces and stores air separated from the heat transfer medium in the receiver tank, and a liquid level controller that controls a liquid level in the receiver tank such that the heat transfer medium in the liquid phase state is stored in the receiver tank at a predetermined liquid level height.
    Type: Application
    Filed: November 8, 2021
    Publication date: May 12, 2022
    Applicant: NEC Corporation
    Inventors: Yoshinori MIYAMOTO, Minoru YOSHIKAWA, Masaki CHIBA
  • Publication number: 20220151115
    Abstract: A system (20) for controlling an air conditioner (12) includes a plurality of pressure sensors (19) and a controller (13). Each of the pressure sensors (19) is positioned at an air inlet (15) of each of the racks (11). The controller (13) is configured to receive pressure values from the pressure sensors (19) and control an airflow rate of the cooling air supplied from the air conditioner (12) based on the pressure values. The controller (13) is configured to set a target pressure value for each pressure sensor (19) (S300), acquire a current pressure value for each pressure sensor (S401), calculate a pressure drop value for each pressure sensor (19) between the current pressure value and the target pressure value (S402), and adjust the airflow rate based on a maximum value among the plurality of the pressure drop values (S403 to S410).
    Type: Application
    Filed: March 18, 2019
    Publication date: May 12, 2022
    Applicant: NEC Corporation
    Inventors: Nirmal Singh RAJPUT, Yoshinori MIYAMOTO, Hisato SAKUMA, Minoru YOSHIKAWA
  • Publication number: 20220151113
    Abstract: To efficiently cool down heat of a heating element 20, this electronic device 100 is provided with a circuit board 10 having a heating element 20 that is attached to a first main surface 11 thereof, a case 30 having an opening part 31 that is formed in a surface facing the heating element 20 and housing a refrigerant COO therein, and a connection part 40 connecting the opening part 31 and the heating element 20 so as to enclose the refrigerant COO, the connecting part has a thickness of at most 0.21 mm.
    Type: Application
    Filed: February 14, 2020
    Publication date: May 12, 2022
    Applicant: NEC Corporation
    Inventors: Mahiro HACHIYA, Minoru YOSHIKAWA, Takashi OHTSUKA, Nobuo KANEKO
  • Publication number: 20220141993
    Abstract: A cooling apparatus includes a duct provided above a cooling target and configured to guide an air discharged after absorbing heat generated inside the cooling target to the cooling target, a cooler provided in the duct and configured to cool the air flowing in the duct, and an adjusting mechanism provided downstream of the cooler and configured to adjust the air discharged from the duct to the cooling target, and the duct receives the air discharged from one side of the cooling target and directed upward, guides the air to another side of the cooling target, and discharges the air downward on the other side, and the adjusting mechanism changes a position of an opening at a discharge port of the duct.
    Type: Application
    Filed: October 20, 2021
    Publication date: May 5, 2022
    Applicant: NEC Corporation
    Inventors: Kenji KOBAYASHI, Kunihiko ISHIHARA, Koichi TODOROKI, Yoshinori MIYAMOTO, Minoru YOSHIKAWA
  • Publication number: 20220074632
    Abstract: An outdoor unit includes a fan, a heat exchanger, a vapor pipe, a liquid pipe, and a refrigerant flowing through these pipes, in which the heat exchanger is a parallel flow heat exchanger divided into a plurality and connected in parallel between the vapor pipe and the liquid pipe. The heat exchanger is connected from the vapor pipe via a vapor branch pipe, and the heat exchanger is connected from the vapor pipe via the vapor branch pipe. In addition, the liquid pipe is connected from the heat exchanger via the liquid branch pipe, and the liquid pipe is connected from the heat exchanger via the liquid branch pipe.
    Type: Application
    Filed: September 2, 2021
    Publication date: March 10, 2022
    Applicant: NEC Corporation
    Inventors: Mahiro HACHIYA, Minoru YOSHIKAWA
  • Publication number: 20220074607
    Abstract: An outdoor unit in which, by installing small fans near the ventilation surface of a heat exchanger so as to be parallel with the ventilation surface of the heat exchanger and arranging the small fans so that the ventilation areas of the small fans and the heat exchanger are equivalent, the number of small fans that can be installed is maximized while reducing power consumption.
    Type: Application
    Filed: September 2, 2021
    Publication date: March 10, 2022
    Applicant: NEC Corporation
    Inventors: Mahiro HACHIYA, Minoru YOSHIKAWA
  • Publication number: 20220049880
    Abstract: A heating medium compression apparatus includes: first and second compressors compressing a heating medium; suction side and discharge side pipings connecting the first and second compressors to a heat exchanger; a connection piping connecting a discharge side of the first compressor and a suction side of the second compressor in series; and a control unit controlling a flow rate of the heating medium flowing in the suction side piping, the discharge side piping, and the connection piping. The control unit alternatively connects the first or second compressor to the suction side and discharge side pipings, or connects the first and second compressors in series between the suction side and discharge side pipings and performs control such that the flow rate of the heating medium suctioned into the second compressor connected in series becomes higher than that of the heating medium discharged from the first compressor.
    Type: Application
    Filed: August 10, 2021
    Publication date: February 17, 2022
    Applicant: NEC Corporation
    Inventors: Masaki CHIBA, Minoru Yoshikawa, Yoshinori Miyamoto
  • Publication number: 20220053670
    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.
    Type: Application
    Filed: August 10, 2021
    Publication date: February 17, 2022
    Applicant: NEC Corporation
    Inventors: Kenji KOBAYASHI, Koichi TODOROKI, Nirmal Singh RAJPUT, Yoshinori MIYAMOTO, Masaki CHIBA, Minoru YOSHIKAWA
  • Publication number: 20220049856
    Abstract: An air conditioner includes: a turbo compressor that compresses a heat medium; a heat exchanger that exchanges heat of the heat medium supplied from the turbo compressor with an atmosphere; and a supply flow path and a discharge flow path that connect the turbo compressor and the heat exchanger. At least one of the supply flow path and the discharge flow path includes piping, and the piping includes a gas barrier layer that covers a surface of a synthetic resin.
    Type: Application
    Filed: August 12, 2021
    Publication date: February 17, 2022
    Applicant: NEC Corporation
    Inventors: Masaki CHIBA, Kunihko ISHIHARA, Minoru YOSHIKAWA, Junichi MIYAMOTO, Yoshinori MIYAMOTO
  • Patent number: 11226130
    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.
    Type: Grant
    Filed: January 9, 2018
    Date of Patent: January 18, 2022
    Assignee: NEC CORPORATION
    Inventors: Koichi Todoroki, Arihiro Matsunaga, Masanori Sato, Mizuki Wada, Minoru Yoshikawa
  • Patent number: 11226662
    Abstract: A management device includes: storage unit which stores a known intake air temperature of a heating element, and a heat transfer characteristic of a cooling device; heat extraction amount calculation unit which calculates a heat extraction amount of the cooling device, by use of the refrigerant information input by the input means, and a cooling capacity of the refrigerant; and air volume calculation unit which calculates an air volume of air supplied to the cooling device, by applying the heat extraction amount to air volume dependence of the heat extraction amount, being derived by use of air volume dependence of a difference temperature between a temperature of the refrigerant and a temperature of exhaust air from the heating element, and the heat transfer characteristic, the air volume dependence of the difference temperature being derived by use of the intake air temperature, the power consumption, and the refrigerant information.
    Type: Grant
    Filed: March 29, 2017
    Date of Patent: January 18, 2022
    Assignee: NEC CORPORATION
    Inventors: Yoshinori Miyamoto, Manussanun Buranachokphaisan, Minoru Yoshikawa
  • Publication number: 20210368648
    Abstract: To provide a cooling device capable of cooling a heat-generating body using simple configuration, the cooling device comprises two evaporators, two condensers, a compressor and an expansion valve, and is configured so that any one among a first flow path setting, a second flow path setting, a third flow path setting, and a fourth flow path setting can be selected.
    Type: Application
    Filed: January 21, 2019
    Publication date: November 25, 2021
    Applicant: NEC Corporation
    Inventors: Masaki CHIBA, Minoru YOSHIKAWA, Hisato SAKUMA, Takafumi NATSUMEDA
  • Publication number: 20210337705
    Abstract: The present invention provides a cooling system including a vaporizer (1) which is configured to absorb heat due to a liquid-phase refrigerant R being vaporized, a condenser (2) which is configured to discharge heat due to a refrigerant (R) in a gaseous phase state being liquefied, a resistance body (8) which is provided in a middle of a pipe passage (3) ranging from the vaporizer (1) to the condenser (2) and is configured to apply a resistance to the refrigerant (R), state detection sensors (9) which are provided in the pipe passage (3) on an upstream side and a downstream side of the resistance body (8) and are configured to detect a state of the refrigerant (R) flowing through each side inside the pipe passage (3), and a flow rate control means (C) which is configured to detect the presence of droplets in the refrigerant R flowing through the pipe passage (3) on the basis of a difference between detection values of the state detection sensors (9) which are detected on the upstream side and the downstream s
    Type: Application
    Filed: March 30, 2017
    Publication date: October 28, 2021
    Applicant: NEC Corporation
    Inventors: Arihiro MATSUNAGA, Koichi TODOROKI, Hisato SAKUMA, Minoru YOSHIKAWA
  • Publication number: 20210278884
    Abstract: A management device includes: storage unit which stores a known intake air temperature of a heating element, and a heat transfer characteristic of a cooling device; heat extraction amount calculation unit which calculates a heat extraction amount of the cooling device, by use of the refrigerant information input by the input means, and a cooling capacity of the refrigerant; and air volume calculation unit which calculates an air volume of air supplied to the cooling device, by applying the heat extraction amount to air volume dependence of the heat extraction amount, being derived by use of air volume dependence of a difference temperature between a temperature of the refrigerant and a temperature of exhaust air from the heating element, and the heat transfer characteristic, the air volume dependence of the difference temperature being derived by use of the intake air temperature, the power consumption, and the refrigerant information.
    Type: Application
    Filed: March 29, 2017
    Publication date: September 9, 2021
    Applicant: NEC CORPORATION
    Inventors: Yoshinori MIYAMOTO, Manussanun BURANACHOKPHAISAN, Minoru YOSHIKAWA
  • Patent number: 11105566
    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.
    Type: Grant
    Filed: March 30, 2017
    Date of Patent: August 31, 2021
    Assignee: NEC CORPORATION
    Inventors: Koichi Todoroki, Arihiro Matsunaga, Minoru Yoshikawa
  • Patent number: 11047627
    Abstract: An evaporator includes: a first surface which conducts heat; a heat medium in the evaporator, which vaporizes as a result of the heat absorbed; a condenser which liquefies the heat medium in a vaporized state; a vapour pipe which guides the heat medium in the vaporized state from the evaporator to the condenser; and a liquid pipe which guides the heat medium in a liquefied state from the condenser to the evaporator. A first opening of the vapour pipe and a second opening of the liquid pipe are disposed in different positions from each other in a first direction, and are disposed so as to open into a heat medium accommodation space inside the evaporator at different positions from each other in a second direction, and which is different to the first direction, and also at different positions from each other in a third direction which intersects the first surface.
    Type: Grant
    Filed: March 21, 2017
    Date of Patent: June 29, 2021
    Assignee: NEC CORPORATION
    Inventors: Masaki Chiba, Mahiro Hachiya, Minoru Yoshikawa