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).
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Patent number: 10302341Abstract: 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: GrantFiled: January 21, 2016Date of Patent: May 28, 2019Assignee: DENSO CORPORATIONInventors: Gouta Ogata, Yuichi Shirota, Hiroya Hasegawa, Tatsuhiro Suzuki, Makoto Ikegami
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Patent number: 10132526Abstract: 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: GrantFiled: May 18, 2015Date of Patent: November 20, 2018Assignee: DENSO CORPORATIONInventors: Gouta Ogata, Yuichi Shirota, Hiroya Hasegawa, Tatsuhiro Suzuki
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Patent number: 10131203Abstract: 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: GrantFiled: September 22, 2014Date of Patent: November 20, 2018Assignee: DENSO CORPORATIONInventors: Tatsuhiro Suzuki, Gouta Ogata, Yuichi Shirota
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Publication number: 20180087848Abstract: 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: ApplicationFiled: January 21, 2016Publication date: March 29, 2018Inventors: Gouta OGATA, Yuichi SHIROTA, Hiroya HASEGAWA, Tatsuhiro SUZUKI, Makoto IKEGAMI
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Publication number: 20170045269Abstract: 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: ApplicationFiled: May 18, 2015Publication date: February 16, 2017Inventors: Gouta OGATA, Yuichi SHIROTA, Hiroya HASEGAWA, Tatsuhiro SUZUKI
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Publication number: 20160280041Abstract: 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: ApplicationFiled: September 22, 2014Publication date: September 29, 2016Applicant: Denso CorporationInventors: Tatsuhiro SUZUKI, Gouta OGATA, Yuichi SHIROTA
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Publication number: 20070144724Abstract: 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: ApplicationFiled: March 5, 2007Publication date: June 28, 2007Inventors: Yuichi Shirota, Hisashi Tanaka, Hiroshi Nonoyama, Kazushi Shikata, Yukio Uemura, Hikaru Sugi, Manabu Miyata, Koji Ito, Teruhiko Kameoka
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Publication number: 20070144725Abstract: 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: ApplicationFiled: March 5, 2007Publication date: June 28, 2007Inventors: Yuichi Shirota, Hisashi Tanaka, Hiroshi Nonoyama, Kazushi Shikata, Yukio Uemura, Hikaru Sugi, Manabu Miyata, Koji Ito, Teruhiko Kameoka
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Patent number: 6854513Abstract: 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: GrantFiled: May 25, 2001Date of Patent: February 15, 2005Assignee: Denso CorporationInventors: Yuichi Shirota, Koji Takahashi, Koichi Ban, Yasushi Yamanaka, Sadayuki Kamiya, Eiichi Torigoe
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Patent number: 6834709Abstract: 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: GrantFiled: March 26, 2001Date of Patent: December 28, 2004Assignee: DENSO CorporationInventors: Yuichi Shirota, Hisashi Tanaka, Hiroshi Nonoyama, Kazushi Shikata, Yukio Uemura, Hikaru Sugi
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Patent number: 6820436Abstract: 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: GrantFiled: April 15, 2003Date of Patent: November 23, 2004Assignee: Denso CorporationInventors: Hiroyuki Tomita, Yuichi Shirota
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Patent number: 6708512Abstract: 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: GrantFiled: September 12, 2002Date of Patent: March 23, 2004Assignee: Denso CorporationInventors: Keiichi Kitamura, Yuichi Shirota, Koji Takahashi
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Publication number: 20030233835Abstract: 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: ApplicationFiled: April 15, 2003Publication date: December 25, 2003Inventors: Hiroyuki Tomita, Yuichi Shirota
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Patent number: 6640568Abstract: 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: GrantFiled: August 21, 2002Date of Patent: November 4, 2003Assignee: Denso CorporationInventors: Yuichi Shirota, Koji Takahashi, Keiichi Kitamura
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Patent number: 6606877Abstract: 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: GrantFiled: November 20, 2002Date of Patent: August 19, 2003Assignee: Denso CorporationInventors: Hiroyuki Tomita, Yuichi Shirota
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Publication number: 20030097852Abstract: 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: ApplicationFiled: November 20, 2002Publication date: May 29, 2003Inventors: Hiroyuki Tomita, Yuichi Shirota
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Publication number: 20030046944Abstract: 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: ApplicationFiled: September 12, 2002Publication date: March 13, 2003Inventors: Keiichi Kitamura, Yuichi Shirota, Koji Takahashi
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Publication number: 20030041610Abstract: 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: ApplicationFiled: August 21, 2002Publication date: March 6, 2003Inventors: Yuichi Shirota, Koji Takahashi, Keiichi Kitamura
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Patent number: 6466853Abstract: 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: GrantFiled: October 12, 2000Date of Patent: October 15, 2002Assignee: Denso CorporationInventors: Yasuhiko Niimi, Yasushi Yamanaka, Koichi Ban, Kazuhito Miyagawa, Yuichi Shirota, Hiroshi Kishita
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Patent number: 6397942Abstract: 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: GrantFiled: May 24, 2000Date of Patent: June 4, 2002Assignee: Denso CorporationInventors: Koichi Ito, Hikaru Sugi, Takashi Toyoshima, Kenji Suwa, Yuichi Shirota