Patents by Inventor Shun OHKUBO

Shun OHKUBO 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: 20220003469
    Abstract: There is provided a refrigerant charging method in which a foreign material and moisture are avoided from entering a heat source unit until a refrigeration cycle apparatus is configured. The refrigerant charging method is a method of charging a refrigerant to a refrigerant circuit in which a refrigeration cycle is to be performed by a circulating refrigerant, the refrigerant circuit being configured by connecting a second heat source unit and a utilization unit to each other. The refrigerant charging method includes charging a first refrigerant to the second heat source unit before connecting the second heat source unit to the utilization unit to configure the refrigerant circuit, and connecting the second heat source unit to the utilization unit and charging a second refrigerant that differs from the first refrigerant to the refrigerant circuit to obtain the circulating refrigerant that includes the second refrigerant and the first refrigerant that is charged in the second heat source unit.
    Type: Application
    Filed: September 20, 2019
    Publication date: January 6, 2022
    Applicant: DAIKIN INDUSTRIES, LTD.
    Inventors: Takuro YAMADA, Atsushi YOSHIMI, Eiji KUMAKURA, Ikuhiro IWATA, Shun OHKUBO
  • Publication number: 20210355359
    Abstract: The present disclosure is to provide a composition comprising a refrigerant that has the characteristics of having a sufficiently low GWP, and having a coefficient of performance (COP) and a refrigerating capacity equivalent to or higher than those of R404A. The present disclosure provides a composition comprising a refrigerant, the refrigerant comprising trans-1,2-difluoroethylene (HFO-1132(E)), 1,1,2-trifluoroethylene (HFO-1123), and 2,3,3,3-tetrafluoropropene (HFO-1234yf), wherein the total concentration of the three components is 99.5 mass % or more, based on the entire refrigerant, and the three components have a mass ratio that falls within a region surrounded by a figure passing through the following 5 points in a ternary composition diagram whose three vertices represent the three components: point A (HFO-1132(E)/HFO-1123/HFO-1234yf=42.5/1.0/56.5 mass %), point B (HFO-1132(E)/HFO-1123/HFO-1234yf=27.1/1.0/71.9 mass %), point C (HFO-1132(E)/HFO-1123/HFO-1234yf=1.0/30.4/68.
    Type: Application
    Filed: July 28, 2021
    Publication date: November 18, 2021
    Applicant: DAIKIN INDUSTRIES, LTD.
    Inventors: Shun OHKUBO, Mitsushi ITANO, Yuuki YOTSUMOTO, Akihito MIZUNO, Tomoyuki GOTOU, Yasufu YAMADA
  • Publication number: 20210355361
    Abstract: The present disclosure provides a composition comprising a refrigerant characterized by having a coefficient of performance (COP) and a refrigerating capacity (Capacity) equivalent to or higher than those of R134a, and having a sufficiently low GWP. The present disclosure is, specifically, a composition comprising a refrigerant, the refrigerant comprising cis-1,2-difluoroethylene (HFO-1132(Z)) and 2,3,3,3-tetrafluoropropene (HFO-1234yf), wherein HFO-1132(Z) is present in an amount of 53.0 to 59.5 mass %, and HFO-1234yf is present in an amount of 47.0 to 40.5 mass %, based on the total mass of IFO-1132(Z) and HFO-1234yf.
    Type: Application
    Filed: July 30, 2021
    Publication date: November 18, 2021
    Applicant: DAIKIN INDUSTRIES, LTD.
    Inventors: Shun OHKUBO, Yuuki YOTSUMOTO, Mitsushi ITANO
  • Publication number: 20210348816
    Abstract: Efficiency in refrigerant charging work is addressed when a recovered refrigerant recovered from a first heat source unit is to be charged to a second heat source unit. A refrigerant charging method is a charging method used when a first heat source unit of an already installed refrigeration cycle apparatus in which a refrigeration cycle is to be performed by a refrigerant that circulates is to be replaced with a second heat source unit. The refrigerant charging method includes recovering a first refrigerant from an already installed refrigeration cycle apparatus and obtaining a recovered refrigerant and charging the recovered refrigerant and charging a second refrigerant whose composition differs from the composition of the recovered refrigerant to the refrigeration cycle apparatus after renewal that includes the second heat source unit.
    Type: Application
    Filed: September 20, 2019
    Publication date: November 11, 2021
    Applicant: DAIKIN INDUSTRIES, LTD.
    Inventors: Takuro YAMADA, Atsushi YOSHIMI, Eiji KUMAKURA, Ikuhiro IWATA, Shun OHKUBO
  • Publication number: 20210340422
    Abstract: The present disclosure provides a composition comprising a refrigerant that has characteristics of having a coefficient of performance (COP) and a refrigerating capacity equivalent to or higher than those of R404A, and having a sufficiently low GWP. More specifically, the present disclosure provides a composition comprising a refrigerant, the refrigerant comprising trans-1,2-difluoroethylene (HFO-1132(E)), difluoromethane (HFC-32), and 2,3,3,3-tetrafluoropropene (HFO-1234yf), wherein the total concentration of the three components is 99.5% by mass or more, based on the entire refrigerant, and three components have a mass ratio that falls within a region surrounded by a figure passing through the following 4 points in a ternary composition diagram whose three vertices represent the three components: point A (HFO-1132(E)/HFC-32/HFO-1234yf=51.8/1.0/47.2 mass %), point B (HFO-1132(E)/HFC-32/HFO-1234yf=35.3/1.0/63.7 mass %), point C (HFO-1132(E)/HFC-32/HFO-1234yf=10.1/18.0/71.
    Type: Application
    Filed: July 13, 2021
    Publication date: November 4, 2021
    Applicant: DAIKIN INDUSTRIES, LTD.
    Inventors: Shun OHKUBO, Mitsushi ITANO, Yuuki YOTSUMOTO, Akihito MIZUNO, Tomoyuki GOTOU, Yasufu YAMADA
  • Publication number: 20210309902
    Abstract: No studies have been made regarding what kinds of refrigerants should be used in a refrigeration cycle device for a vehicle. An air conditioner (1) for a vehicle includes a refrigerant circuit (10) and a refrigerant that is sealed in the refrigerant circuit (10). The refrigerant circuit (10) includes a compressor (80), a first heat exchanger (85), which serves as a heat dissipater in a dehumidifying heating mode, an outside-air heat exchanger (82), a cooling control valve (87), and a second heat exchanger (86), which serves as an evaporator in the dehumidifying heating mode. The refrigerant is a refrigerant having a low GWP.
    Type: Application
    Filed: July 16, 2019
    Publication date: October 7, 2021
    Applicant: DAIKIN INDUSTRIES, LTD.
    Inventors: Eiji KUMAKURA, Kazuhiro FURUSHO, Masaru TANAKA, Shun OHKUBO, Mitsushi ITANO, Yuuki YOTSUMOTO, Akihito MIZUNO, Tomoyuki GOTOU, Yasufu YAMADA, Tatsumi TSUCHIYA, Kenji GOBOU, Hitomi KUROKI, Daisuke KARUBE, Tatsuya TAKAKUWA, Tetsushi TSUDA
  • Publication number: 20210292626
    Abstract: The present disclosure provides a composition comprising a refrigerant characterized by having a low GWP and a refrigerating capacity and COP that are equivalent to those of R410A. Specifically, the present disclosure provides a composition comprising a refrigerant, the refrigerant comprising difluoromethane (R32) and pentafluoroethane (R125), wherein the total concentration of R32 and R125 is 99.5 mass % or more, and wherein R32 is present in an amount of 53.1 to 56.0 mass %, and R125 is present in an amount of 44.0 to 46.9 mass %, based on the total mass of R32 and R125.
    Type: Application
    Filed: June 5, 2019
    Publication date: September 23, 2021
    Applicant: DAIKIN INDUSTRIES, LTD.
    Inventors: Shun OHKUBO, Hitomi KUROKI, Mitsushi ITANO, Takurou YAMADA
  • Publication number: 20210269693
    Abstract: The present disclosure provides a composition comprising a refrigerant (mixed refrigerant), the composition having three types of performance; i.e., a coefficient of performance (COP) and a refrigerating capacity (Cap) that are equivalent to or higher than those of R404A and/or R410A, and a sufficiently low GWP. The present disclosure specifically provides a composition comprising a refrigerant, the refrigerant comprising difluoromethane (HFC-32), 2,3,3,3-tetrafluoropropene (HFO-1234yf), and at least one of 1,1-difluoroethylene (HFO-1132a) and tetrafluoroethylene (FO-1114).
    Type: Application
    Filed: July 8, 2019
    Publication date: September 2, 2021
    Applicant: DAIKIN INDUSTRIES, LTD.
    Inventors: Mitsushi ITANO, Shun OHKUBO, Hitomi KUROKI, Yasufu YAMADA, Tatsumi TSUCHIYA, Kenji GOBOU
  • Publication number: 20210261841
    Abstract: The present disclosure addresses the problem of providing a refrigerant composition that has a low GWP and a refrigerating capacity equivalent to that of R404A, which is currently widely used. As a solution to the problem, the present disclosure provides a composition containing carbon dioxide and a mixture of fluorinated hydrocarbons, the mixture containing difluoromethane (R32), pentafluoroethane (R125), 2,3,3,3-tetrafluoropropene (R1234yf), 1,1,1,2-tetrafluoroethane (R134a), and carbon dioxide (CO2) in specific concentrations.
    Type: Application
    Filed: April 25, 2019
    Publication date: August 26, 2021
    Applicant: DAIKIN INDUSTRIES, LTD.
    Inventors: Mitsushi ITANO, Hitomi KUROKI, Shun OHKUBO, Tatsumi TSUCHIYA, Kenji GOBOU
  • Publication number: 20210230467
    Abstract: Provided is a composition containing a refrigerant that has a refrigerating capacity equivalent to that of widely used R404A, and a low GWP. The composition contains a refrigerant that contains difluoromethane (R32), pentafluoroethane (R125), 1,1,1-trifluoroethane (R143a), and 1,1,1,2-tetrafluoroethane (R134a) in specific concentrations.
    Type: Application
    Filed: December 7, 2018
    Publication date: July 29, 2021
    Applicant: DAIKIN INDUSTRIES, LTD.
    Inventors: Mitsushi ITANO, Hitomi KUROKI, Shun OHKUBO, Tatsumi TSUCHIYA, Kenji GOBOU
  • Publication number: 20210198547
    Abstract: The present invention provides a refrigerant composition having performance such as ASHRAE non-flammability, a large refrigerating capacity, a GWP lower than that of HFC-134a, and a COP that is equal to that of HFC-134a. A refrigerant composition comprising HFO-1234ze(E) and HFC-134, which is for use in at least one refrigeration apparatus selected from the group consisting of refrigerators, freezers, water coolers, ice makers, refrigerating showcases, freezing showcases, freezing and refrigerating units, refrigerating machines for freezing and refrigerating warehouses, chillers (chilling units), turbo refrigerating machines, and screw refrigerating machines.
    Type: Application
    Filed: October 15, 2018
    Publication date: July 1, 2021
    Applicant: DAIKIN INDUSTRIES, LTD.
    Inventors: Shun OHKUBO, Daisuke KARUBE, Akihito MIZUNO, Hitomi KUROKI, Kazuhiro TAKAHASHI, Yasufu YAMADA, Tatsuya TAKAKUWA, Yuuki YOTSUMOTO
  • Publication number: 20210189208
    Abstract: A problem to be solved is to provide a composition containing a refrigerant that satisfies the following four properties: (1) a GWP of 1500 or less, (2) ASHRAE non-flammability, (3) a COP equivalent to that of R410A, and (4) a refrigerating capacity equivalent to that of R410A. As a solution to the problem, provided is a composition containing a refrigerant that contains CO2, R32, R125, and R134a, wherein when the mass % of CO2, R32, R125, and R134a based on their sum in the refrigerant is respectively x, a, b, and c, coordinates (a,b,c) in a ternary composition diagram in which 2.7?x<6.0, and the sum of R32, R125, and R134a is (100?x) mass % fall within a triangular region surrounded by line segments that connect point E, point F, and point G, or on the line segments; or coordinates (a,b,c) in a ternary composition diagram in which 6.0?x<9.0 fall within a triangular region surrounded by line segments that connect point E, point F, and point G, or on the line segments.
    Type: Application
    Filed: December 12, 2018
    Publication date: June 24, 2021
    Applicant: DAIKIN INDUSTRIES, LTD.
    Inventors: Mitsushi ITANO, Shun OHKUBO, Hitomi KUROKI, Tatsumi TSUCHIYA, Kenji GOBOU
  • Patent number: 11034871
    Abstract: This invention provides a composition comprising a refrigerant, the composition being non-flammable like R404A (R125/R134a/R143a=44/4/52 wt %), and having a refrigerating capacity that can replace that of R404A, a COP that is equal or superior to that of R404A, and a GWP of 1500 or less. Specifically, the invention provides a composition comprising a refrigerant, the refrigerant comprising a mixture of fluorinated hydrocarbons, the mixture comprising difluoromethane (R32), pentafluoroethane (R125), and 1,1,1,2-tetrafluoroethane (R134a) at specific concentrations, the fluorinated hydrocarbons contained in the mixture having a specific composition ratio. This composition is for use as an alternative refrigerant for R22 or an alternative refrigerant for R404A.
    Type: Grant
    Filed: April 19, 2018
    Date of Patent: June 15, 2021
    Assignee: DAIKIN INDUSTRIES, LTD.
    Inventors: Mitsushi Itano, Shun Ohkubo, Hitomi Kuroki, Tatsumi Tsuchiya, Kenji Gobou
  • Publication number: 20210164703
    Abstract: An air-conditioning unit that is able to suppress ignition at an electric heater even when leakage of refrigerant occurs while a low-GWP refrigerant is used is provided. In an outdoor unit (20) including a casing (60), a compressor (21) provided inside the casing (60) and configured to compress refrigerant containing 1,2-difluoroethylene, and a drain pan heater (54) provided inside the casing (60), an electric power consumption of the drain pan heater (54) is lower than or equal to 300 W.
    Type: Application
    Filed: December 10, 2018
    Publication date: June 3, 2021
    Applicant: DAIKIN INDUSTRIES, LTD.
    Inventors: Eiji KUMAKURA, Takuro YAMADA, Atsushi YOSHIMI, Ikuhiro IWATA, Mitsushi ITANO, Daisuke KARUBE, Yuuki YOTSUMOTO, Kazuhiro TAKAHASHI, Yuzo KOMATSU, Shun OHKUBO, Tatsuya TAKAKUWA
  • Publication number: 20210164698
    Abstract: In an air conditioner that uses a refrigerant mixture containing at least 1,2-difluoroethylene, high efficiency is achieved. The motor rotation rate of a compressor (100) can be changed in accordance with an air conditioning load, and thus a high annual performance factor (APF) can be achieved. In addition, an electrolytic capacitor is not required on an output side of a rectifier circuit (21), and thus an increase in the size and cost of the circuit is suppressed.
    Type: Application
    Filed: December 18, 2018
    Publication date: June 3, 2021
    Applicant: DAIKIN INDUSTRIES, LTD.
    Inventors: Keisuke OHTSUKA, Mitsushi ITANO, Daisuke KARUBE, Yuuki YOTSUMOTO, Kazuhiro TAKAHASHI, Yuzo KOMATSU, Shun OHKUBO, Tatsuya TAKAKUWA, Tetsushi TSUDA
  • Publication number: 20210164701
    Abstract: In an air conditioner that uses a refrigerant mixture containing at least 1,2-difluoroethylene, high efficiency is achieved. In the air conditioner (1), a compressor (100, 200) can be driven without interposing a power conversion device between an AC power source (90, 190) and a motor (70, 170). Thus, it is possible to provide the air conditioner (1) that is environmentally friendly and has a relatively inexpensive configuration.
    Type: Application
    Filed: December 18, 2018
    Publication date: June 3, 2021
    Applicant: DAIKIN INDUSTRIES, LTD.
    Inventors: Keisuke OHTSUKA, Mitsushi ITANO, Daisuke KARUBE, Yuuki YOTSUMOTO, Kazuhiro TAKAHASHI, Yuzo KOMATSU, Shun OHKUBO, Tatsuya TAKAKUWA, Tetsushi TSUDA
  • Publication number: 20210163804
    Abstract: A refrigeration cycle apparatus (10) includes a refrigerant circuit (11) including a compressor (12), a heat source-side heat exchanger (13), an expansion mechanism (14), and a usage-side heat exchanger (15). In the refrigerant circuit (11), a refrigerant containing at least 1,2-difluoroethylene (HFO-1132 (E)) is sealed. At least during a predetermined operation, in at least one of the heat source-side heat exchanger (13) and the usage-side heat exchanger (15), a flow of the refrigerant and a flow of a heating medium that exchanges heating with the refrigerant are counter flows.
    Type: Application
    Filed: December 17, 2018
    Publication date: June 3, 2021
    Applicant: DAIKIN INDUSTRIES, LTD.
    Inventors: Eiji KUMAKURA, Takuro YAMADA, Atsushi YOSHIMI, Ikuhiro IWATA, Mitsushi ITANO, Daisuke KARUBE, Yuuki YOTSUMOTO, Kazuhiro TAKAHASHI, Tatsuya TAKAKUWA, Yuzo KOMATSU, Shun OHKUBO
  • Publication number: 20210147734
    Abstract: Provided is an alternative mixed refrigerant that has an acceptable concentration (OEL) of 400 ppm or more based on the entire composition, as calculated with the OEL of R1234yf as 200 ppm. A solution is to provide a composition containing a refrigerant that contains difluoromethane (R32), 2,3,3,3-tetrafluoropropene (R1234yf), and trans-1,3,3,3-tetrafluoropropene (R1234ze(E)), wherein the three components have a mass ratio that falls within the region surrounded by lines a, b, c, d, and e that connect 5 points (points A, B, C, D, and E) of a ternary composition diagram that has the three components as vertices of FIG. 1.
    Type: Application
    Filed: January 28, 2021
    Publication date: May 20, 2021
    Applicant: DAIKIN INDUSTRIES, LTD.
    Inventors: Mitsushi ITANO, Shun OHKUBO, Hitomi KUROKI, Tatsumi TSUCHIYA, Kenji GOBOU
  • Publication number: 20210139758
    Abstract: The present disclosure provides a composition comprising a refrigerant characterized by having a coefficient of performance (COP) and a refrigerating capacity equivalent to or higher than those of R404A, and having a sufficiently low GWP. Specifically, the present disclosure provides a composition comprising a refrigerant, the refrigerant comprising trans-1,2-difluoroethylene (HFO-1132 (E)) and 2,3,3,3-tetrafluoropropene (HFO-1234yf), wherein HFO-1132 (E) is present in an amount of 35.0 to 65.0 mass %, and HFO-1234yf is present in an amount of 65.0 to 35.0 mass %, based on the total mass of HFO-1132 (E) and HFO-1234yf, and wherein the refrigerant is for use in operating a refrigeration cycle in which the evaporation temperature is ?75 to ?5° C.
    Type: Application
    Filed: December 29, 2020
    Publication date: May 13, 2021
    Applicant: DAIKIN INDUSTRIES, LTD.
    Inventors: Shun OHKUBO, Mitsushi ITANO, Yuuki YOTSUMOTO, Akihito MIZUNO, Tomoyuki GOTOU, Yasufu YAMADA
  • Publication number: 20210122961
    Abstract: The present invention provides a composition containing a refrigerant having characteristics equal to or higher than those of R23. Specifically, the present invention provides a composition containing a refrigerant, wherein the refrigerant contains (a) at least one perfluorocarbon (PFC) selected from the group consisting of PFC-14, PFC-116, PFC-c216, FFC-218, PFC-c318, and PFC-31-10, and (b) an unsaturated compound.
    Type: Application
    Filed: April 17, 2019
    Publication date: April 29, 2021
    Applicant: DAIKIN INDUSTRIES, LTD.
    Inventors: Shun OHKUBO, Mitsushi ITANO, Hitomi KUROKI, Tatsumi TSUCHIYA, Kenji GOBOU