Patents by Inventor Yuichi Shirota

Yuichi Shirota 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).

  • Patent number: 10302341
    Abstract: An ejector-integrated heat exchanger includes multiple tube forming members. The tube forming member includes an ejector, a flow-out side refrigerant passage, and a suction side refrigerant passage. The ejector includes a nozzle portion decompressing a refrigerant, a refrigerant suction port, and a pressure increasing portion in which the refrigerant drawn from the refrigerant suction port and the refrigerant jetted from the nozzle portion are mixed, a pressure of the mixed refrigerant being increased in the pressure increasing portion. In the flow-out side refrigerant passage, the refrigerant flowing out of the pressure increasing portion performs heat exchange while flowing. In the suction side refrigerant passage, the refrigerant that is to be drawn through the refrigerant suction port performs heat exchange while flowing. Multiple tube forming members are arranged such that the refrigerant flows in parallel with each other.
    Type: Grant
    Filed: January 21, 2016
    Date of Patent: May 28, 2019
    Assignee: DENSO CORPORATION
    Inventors: Gouta Ogata, Yuichi Shirota, Hiroya Hasegawa, Tatsuhiro Suzuki, Makoto Ikegami
  • Patent number: 10132526
    Abstract: In an ejector refrigeration cycle, an inlet of a nozzle portion of an ejector is connected to a refrigerant outlet side of a high-stage side evaporator, a refrigerant suction port of the ejector is connected to a refrigerant outlet side of a low-stage side evaporator, and an internal heat exchanger is provided for exchanging heat between a high-pressure refrigerant flowing into a low-stage side throttle device for decompressing the refrigerant flowing into the low-stage side evaporator, and a low-stage side low-pressure refrigerant flowing out of the low-stage side evaporator. Because a difference in enthalpy between the inlet and outlet of the low-stage side evaporator can be enlarged, the cooling capacities exhibited by the respective evaporators can be adjusted to be closer to each other even if the flow-rate ratio Ge/Gn of the suction refrigerant flow rate Ge to the injection refrigerant flow rate Gn is set to a relatively small value so as to make it possible to improve the COP of the cycle.
    Type: Grant
    Filed: May 18, 2015
    Date of Patent: November 20, 2018
    Assignee: DENSO CORPORATION
    Inventors: Gouta Ogata, Yuichi Shirota, Hiroya Hasegawa, Tatsuhiro Suzuki
  • Patent number: 10131203
    Abstract: An ejector draws a refrigerant on a downstream side of an exterior heat exchanger serving as an evaporator, from a refrigerant suction port by a suction effect of an injection refrigerant injected from a nozzle portion for decompressing a part of the refrigerant discharged from a compressor, and mixes the injection refrigerant with the suction refrigerant to pressurize the mixed refrigerant at a diffuser. The refrigerant flowing out of the diffuser is drawn into the compressor. In this way, the density of the refrigerant drawn into the compressor can be increased, thereby suppressing reduction in flow amount of the refrigerant flowing into an interior condenser serving as a radiator. Thus, even if the temperature of the outside air (heat-absorption target fluid) is decreased, the interior condenser is prevented from degrading its heating capacity for the ventilation air (heating target fluid).
    Type: Grant
    Filed: September 22, 2014
    Date of Patent: November 20, 2018
    Assignee: DENSO CORPORATION
    Inventors: Tatsuhiro Suzuki, Gouta Ogata, Yuichi Shirota
  • Publication number: 20180087848
    Abstract: An ejector-integrated heat exchanger includes multiple tube forming members. The tube forming member includes an ejector, a flow-out side refrigerant passage, and a suction side refrigerant passage. The ejector includes a nozzle portion decompressing a refrigerant, a refrigerant suction port, and a pressure increasing portion in which the refrigerant drawn from the refrigerant suction port and the refrigerant jetted from the nozzle portion are mixed, a pressure of the mixed refrigerant being increased in the pressure increasing portion. In the flow-out side refrigerant passage, the refrigerant flowing out of the pressure increasing portion performs heat exchange while flowing. In the suction side refrigerant passage, the refrigerant that is to be drawn through the refrigerant suction port performs heat exchange while flowing. Multiple tube forming members are arranged such that the refrigerant flows in parallel with each other.
    Type: Application
    Filed: January 21, 2016
    Publication date: March 29, 2018
    Inventors: Gouta OGATA, Yuichi SHIROTA, Hiroya HASEGAWA, Tatsuhiro SUZUKI, Makoto IKEGAMI
  • Publication number: 20170045269
    Abstract: In an ejector refrigeration cycle, an inlet of a nozzle portion of an ejector is connected to a refrigerant outlet side of a high-stage side evaporator, a refrigerant suction port of the ejector is connected to a refrigerant outlet side of a low-stage side evaporator, and an internal heat exchanger is provided for exchanging heat between a high-pressure refrigerant flowing into a low-stage side throttle device for decompressing the refrigerant flowing into the low-stage side evaporator, and a low-stage side low-pressure refrigerant flowing out of the low-stage side evaporator. Because a difference in enthalpy between the inlet and outlet of the low-stage side evaporator can be enlarged, the cooling capacities exhibited by the respective evaporators can be adjusted to be closer to each other even if the flow-rate ratio Ge/Gn of the suction refrigerant flow rate Ge to the injection refrigerant flow rate Gn is set to a relatively small value so as to make it possible to improve the COP of the cycle.
    Type: Application
    Filed: May 18, 2015
    Publication date: February 16, 2017
    Inventors: Gouta OGATA, Yuichi SHIROTA, Hiroya HASEGAWA, Tatsuhiro SUZUKI
  • Publication number: 20160280041
    Abstract: An ejector draws a refrigerant on a downstream side of an exterior heat exchanger serving as an evaporator, from a refrigerant suction port by a suction effect of an injection refrigerant injected from a nozzle portion for decompressing a part of the refrigerant discharged from a compressor, and mixes the injection refrigerant with the suction refrigerant to pressurize the mixed refrigerant at a diffuser. The refrigerant flowing out of the diffuser is drawn into the compressor. In this way, the density of the refrigerant drawn into the compressor can be increased, thereby suppressing reduction in flow amount of the refrigerant flowing into an interior condenser serving as a radiator. Thus, even if the temperature of the outside air (heat-absorption target fluid) is decreased, the interior condenser is prevented from degrading its heating capacity for the ventilation air (heating target fluid).
    Type: Application
    Filed: September 22, 2014
    Publication date: September 29, 2016
    Applicant: Denso Corporation
    Inventors: Tatsuhiro SUZUKI, Gouta OGATA, Yuichi SHIROTA
  • Publication number: 20070144724
    Abstract: An automotive air conditioner comprises an offset blower for blowing an air, an evaporator is centrally disposed within a dashboard and receives the air from below, and a heater approximately horizontally disposed above the evaporator. The evaporator inclines downward along the direction of the air flow. A plurality of condensed water guide plates are provided under the evaporator so as to allow a condensed water smoothly flow on the surface of each guide plate and is discharged from the evaporator through a condensed water drain pipe.
    Type: Application
    Filed: March 5, 2007
    Publication date: June 28, 2007
    Inventors: Yuichi Shirota, Hisashi Tanaka, Hiroshi Nonoyama, Kazushi Shikata, Yukio Uemura, Hikaru Sugi, Manabu Miyata, Koji Ito, Teruhiko Kameoka
  • Publication number: 20070144725
    Abstract: An automotive air conditioner comprises an offset blower for blowing an air, an evaporator is centrally disposed within a dashboard and receives the air from below, and a heater approximately horizontally disposed above the evaporator. The evaporator inclines downward along the direction of the air flow. A plurality of condensed water guide plates are provided under the evaporator so as to allow a condensed water smoothly flow on the surface of each guide plate and is discharged from the evaporator through a condensed water drain pipe.
    Type: Application
    Filed: March 5, 2007
    Publication date: June 28, 2007
    Inventors: Yuichi Shirota, Hisashi Tanaka, Hiroshi Nonoyama, Kazushi Shikata, Yukio Uemura, Hikaru Sugi, Manabu Miyata, Koji Ito, Teruhiko Kameoka
  • Patent number: 6854513
    Abstract: In a vehicle air conditioning system, a cold accumulator is disposed between a downstream air side of a cooling heat exchanger and an upstream air side of a heating heat exchanger to be cooled by cold air having passed through the cooling heat exchanger. Further, the cold accumulator is disposed at the upstream air side of an air mixing door.
    Type: Grant
    Filed: May 25, 2001
    Date of Patent: February 15, 2005
    Assignee: Denso Corporation
    Inventors: Yuichi Shirota, Koji Takahashi, Koichi Ban, Yasushi Yamanaka, Sadayuki Kamiya, Eiichi Torigoe
  • Patent number: 6834709
    Abstract: An automotive air conditioner includes an offset blower for blowing an air, an evaporator is centrally disposed within a dashboard and receives the air from below, and a heater approximately horizontally disposed above the evaporator. The evaporator inclines downward along the direction of the air flow. A plurality of condensed water guide plates are provided under the evaporator so as to allow a condensed water smoothly flow on the surface of each guide plate and is discharged from the evaporator through a condensed water drain pipe.
    Type: Grant
    Filed: March 26, 2001
    Date of Patent: December 28, 2004
    Assignee: DENSO Corporation
    Inventors: Yuichi Shirota, Hisashi Tanaka, Hiroshi Nonoyama, Kazushi Shikata, Yukio Uemura, Hikaru Sugi
  • Patent number: 6820436
    Abstract: A vehicle air-conditioning system calculates and indicates the remaining time of effective cooling by cold air discharge from its cold storage unit during a vehicular eco-run halt. In cold discharge cooling mode, a first cold discharge cooling remaining time tx1 is calculated from the remaining cold heat of a cold storage medium. A second cold discharge cooling remaining time tx2 is calculated from temperature changes of the cold storage unit. The second remaining time tx2 is set to zero when the cold storage unit temperature rises to a cooling upper target temperature. The first remaining time tx1 is selected in the cold discharge cooling mode as long as the temperature of the cold storage unit is below a temperature near the solidifying point of the cold storage medium. The second remaining time tx2 is selected when the cold storage unit temperature exceeds the temperature near the solidifying point.
    Type: Grant
    Filed: April 15, 2003
    Date of Patent: November 23, 2004
    Assignee: Denso Corporation
    Inventors: Hiroyuki Tomita, Yuichi Shirota
  • Patent number: 6708512
    Abstract: In a vehicle air conditioner, a cold accumulator is disposed at a downstream air side of an evaporator to be cooled by cold air after passing through the evaporator. A cold accumulating material is sealed within the cold accumulator to be solidified while being cooled by the cold air from the evaporator. The cold accumulating material is a mixture of plural kinds of paraffin materials having different melting points, equal to or more than two. The plural kinds of the paraffin materials are mixed, so that the cold accumulating material having a melting point in a range of 7-11° C. can be obtained. In this case, cooling function in the cold accumulator can be improved.
    Type: Grant
    Filed: September 12, 2002
    Date of Patent: March 23, 2004
    Assignee: Denso Corporation
    Inventors: Keiichi Kitamura, Yuichi Shirota, Koji Takahashi
  • Publication number: 20030233835
    Abstract: A vehicle air-conditioning system calculates and indicates the remaining time of effective cooling by cold air discharge from its cold storage unit during a vehicular eco-run halt. In cold discharge cooling mode, a first cold discharge cooling remaining time tx1 is calculated from the remaining cold heat of a cold storage medium. A second cold discharge cooling remaining time tx2 is calculated from temperature changes of the cold storage unit. The second remaining time tx2 is set to zero when the cold storage unit temperature rises to a cooling upper target temperature. The first remaining time tx1 is selected in the cold discharge cooling mode as long as the temperature of the cold storage unit is below a temperature near the solidifying point of the cold storage medium. The second remaining time tx2 is selected when the cold storage unit temperature exceeds the temperature near the solidifying point.
    Type: Application
    Filed: April 15, 2003
    Publication date: December 25, 2003
    Inventors: Hiroyuki Tomita, Yuichi Shirota
  • Patent number: 6640568
    Abstract: In a vehicle air conditioner, a temperature sensor is disposed on a tank of an evaporator to contact the tank. In addition, the temperature sensor is disposed at a tank position separated from a refrigerant inlet and a refrigerant outlet. Accordingly, a downstream space of the evaporator can be effectively used, and the size of the air conditioner can be reduced while the temperature of the evaporator can be accurately detected using the temperature sensor.
    Type: Grant
    Filed: August 21, 2002
    Date of Patent: November 4, 2003
    Assignee: Denso Corporation
    Inventors: Yuichi Shirota, Koji Takahashi, Keiichi Kitamura
  • Patent number: 6606877
    Abstract: A vehicle air conditioner allows storing cold thermal energy in a cold thermal energy storage unit during operation of a vehicle engine to be used later during an eco-run mode of a hybrid vehicle. Vehicle cabin air is cooled by the cold thermal energy quantity of a cold thermal energy storage unit when the vehicle engine is stopped and cold air continues to be requested by passengers. During engine operation, the cold thermal energy storage time, which is the time it takes for the temperature of the cold thermal energy storage unit to reach the solidifying point of the cold thermal energy storage material or lower, is measured. The stored cold thermal energy quantity of the cold thermal energy storage material during the operation of the vehicle engine is calculated based on information including the cold thermal energy storage time and cold air volumes.
    Type: Grant
    Filed: November 20, 2002
    Date of Patent: August 19, 2003
    Assignee: Denso Corporation
    Inventors: Hiroyuki Tomita, Yuichi Shirota
  • Publication number: 20030097852
    Abstract: A vehicle air conditioner allows storing cold thermal energy in a cold thermal energy storage unit during operation of a vehicle engine to be used later during an eco-run mode of a hybrid vehicle. Vehicle cabin air is cooled by the cold thermal energy quantity of a cold thermal energy storage unit when the vehicle engine is stopped and cold air continues to be requested by passengers. During engine operation, the cold thermal energy storage time, which is the time it takes for the temperature of the cold thermal energy storage unit to reach the solidifying point of the cold thermal energy storage material or lower, is measured. The stored cold thermal energy quantity of the cold thermal energy storage material during the operation of the vehicle engine is calculated based on information including the cold thermal energy storage time and cold air volumes.
    Type: Application
    Filed: November 20, 2002
    Publication date: May 29, 2003
    Inventors: Hiroyuki Tomita, Yuichi Shirota
  • Publication number: 20030046944
    Abstract: In a vehicle air conditioner, a cold accumulator is disposed at a downstream air side of an evaporator to be cooled by cold air after passing through the evaporator. A cold accumulating material is sealed within the cold accumulator to be solidified while being cooled by the cold air from the evaporator. The cold accumulating material is a mixture of plural kinds of paraffin materials having different melting points, equal to or more than two. The plural kinds of the paraffin materials are mixed, so that the cold accumulating material having a melting point in a range of 7-11° C. can be obtained. In this case, cooling function in the cold accumulator can be improved.
    Type: Application
    Filed: September 12, 2002
    Publication date: March 13, 2003
    Inventors: Keiichi Kitamura, Yuichi Shirota, Koji Takahashi
  • Publication number: 20030041610
    Abstract: In a vehicle air conditioner, a temperature sensor is disposed on a tank of an evaporator to contact the tank. In addition, the temperature sensor is disposed at a tank position separated from a refrigerant inlet and a refrigerant outlet. Accordingly, a downstream space of the evaporator can be effectively used, and the size of the air conditioner can be reduced while the temperature of the evaporator can be accurately detected using the temperature sensor.
    Type: Application
    Filed: August 21, 2002
    Publication date: March 6, 2003
    Inventors: Yuichi Shirota, Koji Takahashi, Keiichi Kitamura
  • Patent number: 6466853
    Abstract: In the transmission and air conditioning control system having an air conditioner provided with a compressor driven by an engine and an evaporator for cooling a passenger room, and a transmission connected between the engine and a wheel, an electronically control device controls the transmission ratio to a reference value to be decided by the operating condition of the vehicle and also to a final value, which is higher than the reference value, when a degree of cooling demand is greater than a predetermined value. As a result, the revolution of the engine is more increased so that the revolution of compressor may be more increased to improve the cool down performance.
    Type: Grant
    Filed: October 12, 2000
    Date of Patent: October 15, 2002
    Assignee: Denso Corporation
    Inventors: Yasuhiko Niimi, Yasushi Yamanaka, Koichi Ban, Kazuhito Miyagawa, Yuichi Shirota, Hiroshi Kishita
  • Patent number: 6397942
    Abstract: An air conditioning apparatus for a vehicle includes a front air-conditioning unit for adjusting a temperature of air blown toward a front seat side in a passenger compartment, and a rear air-conditioning unit for adjusting a temperature of air blown toward a rear seat side in the passenger compartment. In the front air-conditioning unit, a ratio between an amount of air passing through a front heater core and an amount of air bypassing the front heater core is adjusted by an air mixing door, and the temperature of air blown toward the front seat side in the passenger compartment is adjusted by the rotation of the air mixing door. On the other hand, in the rear air-conditioning unit, a flow control valve for controlling a flow rate of hot water flowing into a rear heater core is provided, and the temperature of air blown toward the rear seat side in the passenger compartment is adjusted by the flow control valve.
    Type: Grant
    Filed: May 24, 2000
    Date of Patent: June 4, 2002
    Assignee: Denso Corporation
    Inventors: Koichi Ito, Hikaru Sugi, Takashi Toyoshima, Kenji Suwa, Yuichi Shirota