Patents by Inventor Yoshitaka Tomatsu
Yoshitaka Tomatsu 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: 7739881Abstract: A refrigeration cycle controls a second evaporator while a first evaporator is operating. The refrigeration cycle of the present invention makes a differential pressure between an inlet refrigerant pressure and an outlet refrigerant pressure of a second evaporator solenoid valve when starting or stopping the second evaporator during operation of the first evaporator smaller than the differential pressure when operating only the first evaporator, then opening or closing the second evaporator solenoid valve.Type: GrantFiled: December 14, 2006Date of Patent: June 22, 2010Assignee: Denso CorporationInventors: Ken Matsunaga, Yoshitaka Tomatsu
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Patent number: 7694528Abstract: In a heat exchanging apparatus for a vapor compression refrigerant cycle, an internal heat exchanger is attached to an end of a radiator. The internal heat exchanger is arranged such that high-pressure refrigerant passages are closer to the radiator than low-pressure refrigerant passages. The heat exchanging apparatus can be mounted on a vehicle such that the radiator receives cooling air more than the internal heat exchanger. Because the internal heat exchanger performs heat exchange between high-pressure refrigerant and low-pressure refrigerant, performance of the internal heat exchanger is not degraded even if it is located at a part receiving less cooling air. Thus, the heat exchanging apparatus is easily mounted on a vehicle by integrating the internal heat exchanger with the radiator, without reducing a cooling capacity of the radiator.Type: GrantFiled: June 9, 2003Date of Patent: April 13, 2010Assignee: Denso CorporationInventors: Shin Nishida, Masaaki Kawakubo, Yoshitaka Tomatsu
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Patent number: 7520320Abstract: An automotive air conditioning system has a primary hot water circuit 11 located on a side where a vehicle installed heat generator 10 is located and a secondary hot water circuit 13 which includes a hot water type heater core 12 for heating passenger compartment outlet air, whereby when in a heating mode, in the event that a coolant temperature TW1 of the primary hot water circuit is lower than a coolant temperature TW2 of the secondary hot water circuit 13, an opening and closing valve 26 is closed, whereas an opening and closing valve 23 is opened, so that a state is created in which the hot water circuits 11, 13 are separated from each other.Type: GrantFiled: February 16, 2005Date of Patent: April 21, 2009Assignee: Denso CorporationInventors: Satoshi Itoh, Yoshitaka Tomatsu, Yasutaka Kuroda
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Patent number: 7434849Abstract: The front end portion of a fitting projection from the portion on which a backup ring is mounted to the front end, has a diameter smaller than the inner diameter of the backup ring. The backup ring is endless in the circumferential direction thereof. The backup ring functions as a sealing member.Type: GrantFiled: July 21, 2004Date of Patent: October 14, 2008Assignee: Denso CorporationInventors: Masayuki Takeuchi, Yoshitaka Tomatsu
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Patent number: 7341210Abstract: A nozzle cap is disclosed which is threadedly engaged with a distal end of a nozzle through which a compressed fluid is passed. The nozzle cap includes a terminal wall opposed to a distal end face of the nozzle axially with respect to the nozzle, a sealing member placed on the terminal wall so as to adhere closely to the distal end of the nozzle thereby to seal an opening of the nozzle, and a holding wall pressing and holding an edge of the sealing member in co-operation with the terminal wall between the walls.Type: GrantFiled: November 14, 2003Date of Patent: March 11, 2008Assignees: Pacific Industrial Co., Ltd., Denso CorporationInventors: Masahiko Yamamoto, Hajime Mukawa, Yoshitaka Tomatsu
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Publication number: 20070151270Abstract: A refrigeration cycle not generating unpleasant noise when starting or stopping a second evaporator while a first evaporator is operating is provided. The refrigeration cycle of the present invention is characterized by making a differential pressure between an inlet refrigerant pressure and outlet refrigerant pressure of a second evaporator solenoid valve when starting or stopping the second evaporator during operation of the first evaporator smaller than the differential pressure when operating only the first evaporator, then opening or closing the second evaporator solenoid valve.Type: ApplicationFiled: December 14, 2006Publication date: July 5, 2007Applicant: DENSO CorporationInventors: Ken Matsunaga, Yoshitaka Tomatsu
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Patent number: 7165948Abstract: A nozzle (41) is made of a sintered metal, and a pressure increasing portion (a mixing portion (42) and a diffuser (43)) is manufactured by plastic-forming a metal pipe. Accordingly, the nozzle (41) can be manufactured in a short time while high accuracy in machining is maintained. Thus, the cost of manufacturing an ejector (40) can be reduced.Type: GrantFiled: May 12, 2003Date of Patent: January 23, 2007Assignee: Denso CorporationInventors: Hirotsugu Takeuchi, Yoshitaka Tomatsu, Masayuki Takeuchi
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Publication number: 20060150650Abstract: An expansion valve for a refrigerating cycle, in which the body dimensions and the weight of the whole valve can be reduced and a reduction in cost can be achieved.Type: ApplicationFiled: January 12, 2006Publication date: July 13, 2006Applicant: DENSO CorporationInventors: Yoshinori Murase, Yoshitaka Tomatsu, Nobuharu Kakehashi, Hiromi Ohta
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Patent number: 7062929Abstract: An air-conditioner includes a compressor, a radiator, an evaporator, an ejector, and a separator. The compressor compresses refrigerant and variably controls an amount of the refrigerant. The radiator cools high-pressure refrigerant. The evaporator cools air blowing into a passenger compartment of a vehicle. The ejector having a nozzle jets the refrigerant at high speed. The separator separates the refrigerant into gas refrigerant and liquid refrigerant. An opening degree of a throttle of the nozzle in the ejector becomes larger so as to increase a cooling performance of the air-conditioner when the amount of the refrigerant discharged from the compressor is smaller than a maximum amount of the refrigerant.Type: GrantFiled: September 4, 2003Date of Patent: June 20, 2006Assignee: DENSO CorporationInventors: Shin Nishida, Yoshitaka Tomatsu
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Patent number: 7040117Abstract: In an ejector refrigerant cycle, even if refrigerant is super-heated in an evaporator, super-heated gas refrigerant does not directly flow into a gas-liquid separator, so that boiling of refrigerant does not occur in the gas-liquid separator due to evaporation of refrigerant in the gas-liquid separator. When an equivalent inner diameter (D) of a tank body of the gas-liquid separator is set in a range of 2 cm–6 cm, and when a ratio of a vertical dimension (H) of the tank body to the equivalent inner diameter (D) thereof is larger than 1, a wall thickness of the tank body can be reduced while gas-liquid separation performance in the gas-liquid separator can be improved.Type: GrantFiled: May 8, 2003Date of Patent: May 9, 2006Assignee: DENSO CorporationInventors: Shin Nishida, Yoshitaka Tomatsu, Keiichi Kitamura
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Patent number: 6994114Abstract: A pressure control valve, which has a main valve for control, capable of opening and closing a valve hole by means of a diaphragm, and controls the pressure of a fluid by the agency of the main valve for control, comprises a non-return auxiliary valve located around the main valve for control so as to be coaxial therewith. The non-return auxiliary valve includes a cylindrical portion to be guided by a valve guard body having the valve hole therein and an annular rib extending outward from one end of the cylindrical portion. The rib can engage an auxiliary-valve seat on an outlet-side case.Type: GrantFiled: February 25, 2003Date of Patent: February 7, 2006Assignees: Fujikoki Corporation, Denso CorporationInventors: Sadatake Ise, Masaki Tomaru, Hiroshi Kainuma, Yoshitaka Tomatsu, Masayuki Takeuchi
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Publication number: 20050274141Abstract: A nozzle (41) is made of a sintered metal, and a pressure increasing portion (a mixing portion (42) and a diffuser (43)) is manufactured by plastic-forming a metal pipe. Accordingly, the nozzle (41) can be manufactured in a short time while high accuracy in machining is maintained. Thus, the cost of manufacturing an ejector (40) can be reduced.Type: ApplicationFiled: August 22, 2005Publication date: December 15, 2005Applicant: DENSO CorporationInventors: Hirotsugu Takeuchi, Yoshitaka Tomatsu, Masayuki Takeuchi
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Publication number: 20050178523Abstract: An automotive air conditioning system has a primary hot water circuit 11 located on a side where a vehicle installed heat generator 10 is located and a secondary hot water circuit 13 which includes a hot water type heater core 12 for heating passenger compartment outlet air, whereby when in a heating mode, in the event that a coolant temperature TW1 of the primary hot water circuit is lower than a coolant temperature TW2 of the secondary hot water circuit 13, an opening and closing valve 26 is closed, whereas an opening and closing valve 23 is opened, so that a state is created in which the hot water circuits 11, 13 are separated from each other.Type: ApplicationFiled: February 16, 2005Publication date: August 18, 2005Inventors: Satoshi Itoh, Yoshitaka Tomatsu, Yasutaka Kuroda
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Patent number: 6880362Abstract: In a refrigerating cycle, a heat radiation of a gas cooler is reduced by a heat radiation reduction member when one of a pressure and a temperature of a high pressure side refrigerant is equal to or less than a predetermined value. When a discharge pressure of the refrigerant discharged from a compressor is equal to or lower than the predetermined level, the heat radiation of the gas cooler is reduced by the heat radiation reduction member. Thus, the refrigerant pressure of the high pressure side is increased while the refrigerant pressure of a low pressure side is decreased. With this, a flow rate at a high pressure inlet of an ejector is increased. Also, a flow rate at a low pressure inlet of the ejector is increased. Accordingly, a temperature of air blown from an evaporator is decreased without frosting the evaporator even when a load of the cycle is low.Type: GrantFiled: June 22, 2004Date of Patent: April 19, 2005Assignee: Denso CorporationInventors: Gum Bae Choi, Masayuki Takeuchi, Yoshitaka Tomatsu
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Publication number: 20050051295Abstract: By the use of the suction pressure of a compressor, the pressure in back pressure chambers 71g and 71h are reduced to open a refrigerant inlet side and a refrigerant outlet side of an evaporator, and when the compressor is at rest, by the use of a first coil spring 76 and a second coil spring 77, the refrigerant inlet side and the refrigerant outlet side of the evaporator 40 are closed mechanically. Due to this, it is possible to minimize a refrigerant leak by the use of an inexpensive means.Type: ApplicationFiled: December 16, 2003Publication date: March 10, 2005Inventors: Yasushi Yamanaka, Yoshitaka Tomatsu
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Publication number: 20050046187Abstract: A pipe joint for the refrigeration cycle is disclosed. A female joint (20) has a fitting recess (24), and a male join (10) has a fitting protrusion (14) and a stepped portion (13). In the male joint (10) and the female joint (20), a backup ring (30) and an O-ring (31) are fitted adjacently to each other in the stepped portion. The fitting protrusion (14), the backup ring (30) and the O-ring (31) are fitted in a fitting recess (24). The O-ring (31) is formed of an elastic material having a high blister resistance to carbon dioxide refrigerant. The backup ring (30) is formed of a resin material having a smaller permeability coefficient than the O-ring (31) against the carbon dioxide refrigerant and plastically deformable under the pressure of the refrigerant imposed on the O-ring (31). The refrigerant leakage amount can thus be minimized.Type: ApplicationFiled: July 27, 2004Publication date: March 3, 2005Inventors: Masayuki Takeuchi, Yoshitaka Tomatsu, Osamu Shioume
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Patent number: 6857280Abstract: By the use of the suction pressure of a compressor, the pressure in back pressure chambers 71g and 71h are reduced to open a refrigerant inlet side and a refrigerant outlet side of an evaporator, and when the compressor is at rest, by the use of a first coil spring 76 and a second coil spring 77, the refrigerant inlet side and the refrigerant outlet side of the evaporator 40 are closed mechanically. Due to this, it is possible to minimize a refrigerant leak by the use of an inexpensive means.Type: GrantFiled: December 16, 2003Date of Patent: February 22, 2005Assignee: Denso CorporationInventors: Yasushi Yamanaka, Yoshitaka Tomatsu
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Publication number: 20050023828Abstract: The front end portion of a fitting projection from the portion on which a backup ring is mounted to the front end, has a diameter smaller than the inner diameter of the backup ring. The backup ring is endless in the circumferential direction thereof. A bias cut of the backup ring is not required when the backup ring is fitted on the fitting projection and, accordingly, the endless backup ring which continuously extends in a circumferential direction can be used. Therefore, the backup ring can also function as a sealing member and, thus, the refrigeration cycle pipe joint having the excellent refrigerant sealing property can be obtained. Consequently, a necessary amount of a refrigerant can be reduced because the amount of a refrigerant which permeates to the atmosphere is reduced, and the size of a receiver or an accumulator, having a refrigerant storing function, can be reduced.Type: ApplicationFiled: July 21, 2004Publication date: February 3, 2005Inventors: Masayuki Takeuchi, Yoshitaka Tomatsu
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Patent number: 6837069Abstract: In a refrigerant cycle with an ejector, there is provided with a bypass passage through which a part of high-pressure refrigerant from a radiator flows into a low-pressure refrigerant passage between an evaporator and a suction port of the ejector while bypassing a nozzle of the ejector. Further, a control valve is disposed to open the bypass passage so that refrigerant flows through the bypass passage when the pressure of the high-pressure refrigerant becomes in a predetermined condition. Accordingly, it can prevent the pressure of the high-pressure refrigerant from being excessively increased due to increase of a refrigerant flow amount. Therefore, the refrigerant cycle operates stably.Type: GrantFiled: July 15, 2003Date of Patent: January 4, 2005Assignee: Denso CorporationInventors: Masayuki Takeuchi, Yoshitaka Tomatsu
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Publication number: 20040255613Abstract: In a refrigerating cycle, a heat radiation of a gas cooler is reduced by a heat radiation reduction member when one of a pressure and a temperature of a high pressure side refrigerant is equal to or less than a predetermined value. When a discharge pressure of the refrigerant discharged from a compressor is equal to or lower than the predetermined level, the heat radiation of the gas cooler is reduced by the heat radiation reduction member. Thus, the refrigerant pressure of the high pressure side is increased while the refrigerant pressure of a low pressure side is decreased. With this, a flow rate at a high pressure inlet of an ejector is increased. Also, a flow rate at a low pressure inlet of the ejector is increased. Accordingly, a temperature of air blown from an evaporator is decreased without frosting the evaporator even when a load of the cycle is low.Type: ApplicationFiled: June 22, 2004Publication date: December 23, 2004Inventors: Gum Bae Choi, Masayuki Takeuchi, Yoshitaka Tomatsu