Patents by Inventor Tetsuji Saikusa
Tetsuji Saikusa 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: 20230168040Abstract: A heat exchanger includes: a heat exchange body having a plurality of flat tubes arranged and spaced from each other in a horizontal direction; an upper header provided at an upper end of the heat exchange body; a lower header provided at a lower end of the heat exchange body; and a partition plate provided in at least one of the upper and lower headers to partition the heat exchange body into a plurality of regions in a horizontal direction. The partition plate is provided such that in each of the regions, refrigerant flows in the opposite direction to the flow direction of the refrigerant in an adjacent one of the regions, and is provided such that regarding the regions, the more downward the region in the flow of the refrigerant when the heat exchanger operates as a condenser, the smaller a flow passage cross-sectional area of the region.Type: ApplicationFiled: May 22, 2020Publication date: June 1, 2023Inventors: Yoji ONAKA, Takashi MATSUMOTO, Rihito ADACHI, Tetsuji SAIKUSA, Yuki NAKAO, Hiroyuki MORIMOTO
-
Publication number: 20230146747Abstract: A refrigerant distributor includes an outer pipe, an inner pipe, and a structural part. The refrigerant outflow hole is provided such that an angle ? between a lower end of the inner pipe on a vertical line passing through a center of the inner pipe and a position of presence of the refrigerant outflow hole as seen from the center of the inner pipe falls within a range of 10 degrees???80 degrees. The refrigerant outflow hole comprises a sole refrigerant outflow hole provided in a vertical cross-section of the inner pipe at a position where the refrigerant outflow hole is provided.Type: ApplicationFiled: May 19, 2021Publication date: May 11, 2023Inventors: Yoji ONAKA, Takashi MATSUMOTO, Rihito ADACHI, Tetsuji SAIKUSA, Yuki NAKAO, Hiroyuki MORIMOTO, Atsushi KIBE
-
Publication number: 20230147134Abstract: A heat exchanger satisfies Expression (1) below, where the number of the main heat transfer tubes is represented as N1, and the number of the sub-heat transfer tubes is represented as N2. In this heat exchanger, the main heat exchanger satisfies Expressions (2) and (3) below, while the sub-heat exchanger satisfies Expressions (4) and (5) below. 0.1<N2(N1+N2)<0.4??(1) 0.03<Ta1/Ha1<0.3??(2) 0.03<Ta2/Ha2<0.Type: ApplicationFiled: May 22, 2020Publication date: May 11, 2023Inventors: Yuki NAKAO, Tetsuji SAIKUSA, Rihito ADACHI
-
Publication number: 20230128871Abstract: A heat exchanger according to the present disclosure includes a main heat exchange unit configured to exchange heat between air and refrigerant, and condense the refrigerant, a subcooling heat exchange unit configured to exchange heat between air and the refrigerant passing through the main heat exchange unit, and subcool the refrigerant passing through the main heat exchange unit, and a connection pipe configured to connect the main heat exchange unit and the subcooling heat exchange unit to allow the refrigerant to pass therethrough, wherein the connection pipe connects the main heat exchange unit on its outflow side to the refrigerant and the subcooling heat exchange unit on its inflow side to the refrigerant, such that when the main heat exchange unit condenses the refrigerant, the refrigerant from the outside flows into the downstream side of the main heat exchange unit and the subcooling heat exchange unit relative to a flow of the air, and flows out from the upstream side of the main heat exchange unitType: ApplicationFiled: May 22, 2020Publication date: April 27, 2023Inventors: Tetsuji SAIKUSA, Nanami KISHIDA
-
Publication number: 20230101157Abstract: A heat exchanger includes a plurality of flat tubes in which refrigerant flows and a plurality of fins provided between the plurality of flat tubes and configured to transfer heat of refrigerant flowing in the plurality of flat tubes. An upstream end portion of each of the plurality of flat tubes in an air flow direction is located at the same position as an upstream end portion of each of the plurality of fins or protrudes farther than the upstream end portion of each of the plurality of fins, and an opening port is formed at the upstream end portion of each of the plurality of flat tubes or at the upstream end portion of each of the plurality of fins.Type: ApplicationFiled: May 22, 2020Publication date: March 30, 2023Inventors: Rihito ADACHI, Yoji ONAKA, Tetsuji SAIKUSA
-
Publication number: 20230095279Abstract: A heat exchanger includes: a plurality of flat tubes each of which has a refrigerant flow passage through which refrigerant flows in an up-down direction, the plurality of flat tubes being arranged parallel to each other at intervals; a plurality of fins each of which is provided between adjacent flat tubes of the plurality of flat tubes; an upper header to which an upper end portion of each of the plurality of flat tubes is connected; and a lower header to which an a lower end portion of each of the plurality of flat tubes is connected. Lower end portions of the plurality of fins are not joined to the lower header, and a lower gap is formed between the lower end portions of the plurality of fins and the lower header.Type: ApplicationFiled: May 22, 2020Publication date: March 30, 2023Inventors: Naoto HARA, Tetsuji SAIKUSA
-
Patent number: 10697677Abstract: A plate heat exchanger includes a plate stack including a plurality of heat transfer plates stacked with each other. Each of the heat transfer plates includes a heat medium inflow hole serving as an inlet for a heat medium, a heat medium outflow hole serving as an outlet for the heat medium, a refrigerant inflow hole serving as an inlet for refrigerant, and a refrigerant outflow portion located below the refrigerant inflow hole and serving as an outlet for the refrigerant. The heat transfer plates define heat medium passages, through each of which the heat medium flowing from the heat medium inflow hole flows, and refrigerant passages, through each of which the refrigerant flowing from the refrigerant inflow hole flows downward, arranged alternately with one another. Each of the heat medium passages and the refrigerant passages is defined between adjacent ones of the heat transfer plates.Type: GrantFiled: December 11, 2015Date of Patent: June 30, 2020Assignee: Mitsubishi Electric CorporationInventors: Satoru Yanachi, Yohei Kato, Shinichi Uchino, Kohei Kasai, Tomoyoshi Obayashi, Kimitaka Kadowaki, Tetsuji Saikusa
-
Patent number: 10508848Abstract: A refrigeration cycle apparatus using refrigerant including HFO-1123, the refrigeration cycle apparatus including a compressor, a condenser, an expansion valve, and an evaporator connected in a loop, and a cooling unit configured to cool the refrigerant at an inlet of the expansion valve.Type: GrantFiled: March 14, 2014Date of Patent: December 17, 2019Assignees: Mitsubishi Electric Corporation, AGC INC.Inventors: Tetsuji Saikusa, Takeshi Sugimoto
-
Publication number: 20190170412Abstract: A plate heat exchanger includes a plate stack including a plurality of heat transfer plates stacked with each other. Each of the heat transfer plates includes a heat medium inflow hole serving as an inlet for a heat medium, a heat medium outflow hole serving as an outlet for the heat medium, a refrigerant inflow hole serving as an inlet for refrigerant, and a refrigerant outflow portion located below the refrigerant inflow hole and serving as an outlet for the refrigerant. The heat transfer plates define heat medium passages, through each of which the heat medium flowing from the heat medium inflow hole flows, and refrigerant passages, through each of which the refrigerant flowing from the refrigerant inflow hole flows downward, arranged alternately with one another. Each of the heat medium passages and the refrigerant passages is defined between adjacent ones of the heat transfer plates.Type: ApplicationFiled: December 11, 2015Publication date: June 6, 2019Inventors: Satoru YANACHI, Yohei KATO, Shinichi UCHINO, Kohei KASAI, Tomoyoshi OBAYASHI, Kimitaka KADOWAKI, Tetsuji SAIKUSA
-
Patent number: 10145598Abstract: A refrigeration apparatus includes a refrigerant circuit in which a compressor, a condenser, a liquid receiver, a first opening-and-closing valve, an expansion valve, and an evaporator are connected sequentially by pipes and through which refrigerant circulates. The refrigerant is HFO1123 or a refrigerant mixture containing HFO1123. A ratio of a refrigeration capacity to an opening area of the first opening-and-closing valve is within a range of 0.25 to 0.6 (kW/mm2).Type: GrantFiled: March 14, 2014Date of Patent: December 4, 2018Assignees: Mitsubishi Electric Corporation, Asahi Glass Company, LimitedInventors: Takeshi Sugimoto, Tetsuji Saikusa
-
Publication number: 20160327321Abstract: A refrigeration apparatus includes a refrigerant circuit in which a compressor, a condenser, a liquid receiver, a first opening-and-closing valve, an expansion valve, and an evaporator are connected sequentially by pipes and through which refrigerant circulates. The refrigerant is HFO1123 or a refrigerant mixture containing HFO1123. A ratio of a refrigeration capacity to an opening area of the first opening-and-closing valve is within a range of 0.25 to 0.6 (kw/mm2).Type: ApplicationFiled: March 14, 2014Publication date: November 10, 2016Inventors: Takeshi SUGIMOTO, Tetsuji SAIKUSA
-
Publication number: 20160320111Abstract: A refrigeration cycle apparatus using refrigerant including HFO-1123, the refrigeration cycle apparatus including a compressor, a condenser, an expansion valve, and an evaporator connected in a loop, and a cooling unit configured to cool the refrigerant at an inlet of the expansion valve.Type: ApplicationFiled: March 14, 2014Publication date: November 3, 2016Inventors: Tetsuji SAIKUSA, Takeshi SUGIMOTO
-
Patent number: 8899058Abstract: Heating equipment, including a first heat exchanger, a compressor, a second heat exchanger, and a first expansion valve that decompresses a refrigerant flowing from the second heat exchanger to the first heat exchanger, are connected so as to circulate the refrigerant. A third heat exchanger provides heat of the refrigerant flowing from the second heat exchanger to the first heat exchanger to the refrigerant flowing from the first heat exchanger toward the compressor. An injection circuit merges part of the refrigerant flowing from the second heat exchanger to the first heat exchanger with the refrigerant that is sucked by the compressor. An injection expansion valve is installed in the injection circuit and decompresses the refrigerant flowing in the injection circuit. A fourth heat exchanger is installed in the injection circuit to supply heat of the refrigerant flowing from the second heat exchanger toward the first heat exchanger to the refrigerant flowing in the injection circuit.Type: GrantFiled: March 27, 2006Date of Patent: December 2, 2014Assignee: Mitsubishi Electric CorporationInventors: Fumitake Unezaki, Makoto Saitou, Tetsuji Saikusa, Masanori Aoki, Masato Yosomiya
-
Patent number: 8109105Abstract: In a refrigerating air conditioning system using refrigerant such as CO2 used in a supercritical area, a highly efficient refrigerating air conditioning system is provided by adjusting the amount of refrigerant in a radiator which contributes to the efficiency of the system stably and quickly. During heat utilizing operation, the superheat at the exit of an evaporator is controlled to a predetermined value by controlling the opening of an expansion valve provided on the upstream side of the evaporator, and an expansion valve is controlled so that the state of refrigerant in a connection pipe on the high-pressure side becomes a supercritical state. In this state, a flow rate control valve is controlled to change the density of the refrigerant stored in a refrigerant storage container and the amount of refrigerant existing in the radiator is adjusted.Type: GrantFiled: October 7, 2005Date of Patent: February 7, 2012Assignee: Mitsubishi Electric CorporationInventors: Fumitake Unezaki, Tetsuji Saikusa, Takashi Okazaki, Makoto Saitou, Hirokuni Shiba, Sou Nomoto
-
Publication number: 20110079040Abstract: A compressor 1 for compressing a refrigerant containing a hydrofluoroolefin refrigerant, a condenser 2 for condensing the refrigerant by heat exchange, a throttle device 4 for decompressing the condensed refrigerant, an evaporator 5 for evaporating the refrigerant by heat exchange between the decompressed refrigerant and air, and air adsorbing means 3 for adsorbing oxygen and nitrogen are connected by piping so as to configure a refrigerant circuit through which the refrigerant containing the hydrofluoroolefin refrigerant is circulated.Type: ApplicationFiled: June 12, 2009Publication date: April 7, 2011Applicant: Mitsubishi Electric CorporationInventors: Hiroyuki Morimoto, Kazuki Okada, Tetsuji Saikusa
-
Publication number: 20100192607Abstract: Heating equipment, including a first heat exchanger, a compressor, a second heat exchanger, and a first expansion valve that decompresses a refrigerant flowing from the second heat exchanger to the first heat exchanger, are connected so as to circulate the refrigerant. A third heat exchanger provides heat of the refrigerant flowing from the second heat exchanger to the first heat exchanger to the refrigerant flowing from the first heat exchanger toward the compressor. An injection circuit merges part of the refrigerant flowing from the second heat exchanger to the first heat exchanger with the refrigerant that is sucked by the compressor. An injection expansion valve is installed in the injection circuit and decompresses the refrigerant flowing in the injection circuit. A fourth heat exchanger is installed in the injection circuit to supply heat of the refrigerant flowing from the second heat exchanger toward the first heat exchanger to the refrigerant flowing in the injection circuit.Type: ApplicationFiled: April 14, 2010Publication date: August 5, 2010Applicant: Mitsubishi Electric CorporationInventors: Fumitake UNEZAKI, Makoto Saitou, Tetsuji Saikusa, Masanori Aoki, Masato Yosomiya
-
Publication number: 20090071177Abstract: A sufficient heating capacity can be displayed even in cold districts with atmospheric temperatures of ?10° C. or less by improving the heating capacity in the refrigerant air conditioner much more than that of conventional gas injection cycles.Type: ApplicationFiled: March 27, 2006Publication date: March 19, 2009Applicant: MITSUBISHI ELECTRIC CORPORATIONInventors: Fumitake Unezaki, Makoto Saitou, Tetsuji Saikusa, Masanori Aoki, Masato Yosomiya
-
Publication number: 20090013700Abstract: In a refrigerating air conditioning system using refrigerant such as CO2 used in a supercritical area, a highly efficient refrigerating air conditioning system is provided by adjusting the amount of refrigerant in a radiator which contributes to the efficiency of the system stably and quickly. During heat utilizing operation, the superheat at the exit of an evaporator is controlled to a predetermined value by controlling the opening of an expansion valve provided on the upstream side of the evaporator, and an expansion valve is controlled so that the state of refrigerant in a connection pipe on the high-pressure side becomes a supercritical state. In this state, a flow rate control valve is controlled to change the density of the refrigerant stored in a refrigerant storage container and the amount of refrigerant existing in the radiator is adjusted.Type: ApplicationFiled: October 7, 2005Publication date: January 15, 2009Inventors: Fumitake Unezaki, Tetsuji Saikusa, Takashi Okazaki, Makoto Saitou, Hirokuni Shiba, Sou Nomoto
-
Patent number: RE43805Abstract: Refrigeration/air conditioning equipment includes a first internal heat exchanger for exchanging heat between a refrigerant to be sucked in a compressor and a high-pressure liquid refrigerant, an injection circuit for evaporating a bypassed high-pressure liquid at intermediate pressure and injecting the vaporized refrigerant into the compressor, a second internal heat exchanger for exchanging heat between the high-pressure liquid refrigerant and the refrigerant to be injected, and a heat source for heating the refrigerant to be injected.Type: GrantFiled: January 5, 2010Date of Patent: November 20, 2012Assignee: Mitsubishi Electric CorporationInventors: Masanori Aoki, Masato Yosomiya, Fumitake Unezaki, Makoto Saitou, Tetsuji Saikusa
-
Patent number: RE43998Abstract: Refrigeration/air conditioning equipment includes a first internal heat exchanger for exchanging heat between a refrigerant to be sucked in a compressor and a high-pressure liquid refrigerant, an injection circuit for evaporating a bypassed high-pressure liquid at intermediate pressure and injecting the vaporized refrigerant into the compressor, a second internal heat exchanger for exchanging heat between the high-pressure liquid refrigerant and the refrigerant to be injected, and a heat source for heating the refrigerant to be injected.Type: GrantFiled: January 5, 2010Date of Patent: February 19, 2013Assignee: Mitsubishi Electric CorporationInventors: Masanori Aoki, Masato Yosomiya, Fumitake Unezaki, Makoto Saitou, Tetsuji Saikusa