Patents by Inventor Yoshiharu Kajikawa
Yoshiharu Kajikawa 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: 6408933Abstract: In a heat exchanger having a side plate for reinforcing a core portion, after an elastic support member for supporting the core portion is inserted between opposite walls of the side plate, a part of the opposite walls having a slit portion is plastically deformed at a position around the slit to form a protrusion. The protrusion protrudes toward the support member to be engaged with a recess of the elastic support member. Further, the silt is provided to penetrate through each opposite wall without being opened to an outer peripheral end of the side plate. Accordingly, the support member can be readily attached to the side plate, while it can prevent the side plate from being deformed in a brazing.Type: GrantFiled: June 7, 2001Date of Patent: June 25, 2002Assignee: Denso CorporationInventors: Shokichi Fukuoka, Yoshiharu Kajikawa, Akio Hirano, Yasuaki Tsukagoshi, Atsushi Yazawa, Yasuhiro Ando, Fumiaki Nakamura, Hideo Harada, Shinichi Inagaki
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Publication number: 20020003034Abstract: In a heat exchanger having a side plate for reinforcing a core portion, after an elastic support member for supporting the core portion is inserted between opposite walls of the side plate, a part of the opposite walls having a slit portion is plastically deformed at a position around the slit to form a protrusion. The protrusion protrudes toward the support member to be engaged with a recess of the elastic support member. Further, the silt is provided to penetrate through each opposite wall without being opened to an outer peripheral end of the side plate. Accordingly, the support member can be readily attached to the side plate, while it can prevent the side plate from being deformed in a brazing.Type: ApplicationFiled: June 7, 2001Publication date: January 10, 2002Inventors: Shokichi Fukuoka, Yoshiharu Kajikawa, Akio Hirano, Yasuaki Tsukagoshi, Atsushi Yazawa, Yasuhiro Ando, Fumiaki Nakamura, Hideo Harada, Shinichi Inagaki
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Publication number: 20010054496Abstract: A heat exchanger such as a condenser for use in an automobile air-conditioning system is composed of a pair of header tanks, plural tubes connecting both header tanks, and fins made of a thin aluminum plate disposed between the tubes. Those components are all connected to one another by brazing to form a unitary body of the heat exchanger. A solder material for bonding the tubes and the header tanks is attached onto the inner surface of both header tanks to prevent the solder material from dispersing into the thin fins in the brazing process. Thus, the thin aluminum fins are protected against erosion due to the solder dispersed therein.Type: ApplicationFiled: June 26, 2001Publication date: December 27, 2001Inventors: Yoshiharu Kajikawa, Shoei Teshima, Hironobu Fujiyoshi
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Patent number: 5735343Abstract: A core plates forming a core body includes an upstream refrigerant passage for communicating an upper and a lower tank disposed at a downstream side and a downstream refrigerant passage for communicating an upper and a lower tanks disposed at an upstream side with respect to the air flow direction. Ribs are formed on an inner surface of the upstream refrigerant passage to agitate the refrigerant, and inner fins are provided on the inner surface of the downstream refrigerant passage which receives a refrigerant after passing through each the upstream refrigerant passage of each the core body.Type: GrantFiled: December 17, 1996Date of Patent: April 7, 1998Assignee: Denso CorporationInventors: Yoshiharu Kajikawa, Masahiro Shimoya, Eiichi Torigoe
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Patent number: 5720340Abstract: A laminated type heat exchanger includes a plurality of refrigerant passages which are formed by pairs of core plates. Each core plate comprises an outer covering layer, a core layer, and an inner covering layer. The outer covering layer is made of a brazing material of which electric potential is more negative than the core layer while the inner covering layer is made of a brazing material of which electric potential is equal to or more positive than the core layer. The refrigerant passages are formed by brazing only the adjacent two of the inner covering layer. The outer covering layer works as a sacrificial corrosive material with respect to the inner covering layer and the core layer. Leakage of refrigerant from the brazed portions of the core plates is prevented, whereby the corrosion resistance of the laminated type heat exchanger is improved.Type: GrantFiled: July 16, 1996Date of Patent: February 24, 1998Assignee: Denso CorporationInventors: Toshio Ohara, Yasukazu Aikawa, Yoshiharu Kajikawa
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Patent number: 5680773Abstract: A refrigerant evaporator has, at each of a downstream side and an upstream side with respect to a flow direction of air, a pair of upper and lower tanks and a tube connecting the tanks. A refrigerant flows from the pair of tanks and the tube at the downstream side to the pair of tanks and the tube at the upstream side to cool the air flowing outside the tubes. The tanks at the upstream side are formed in an elliptic shape in cross section and the tanks at the downstream side are formed in a circular shape in cross section. The shorter diameter of the elliptic shape lies in a longitudinal direction of the tubes and is the same as the diameter of the circular shape.Type: GrantFiled: October 30, 1996Date of Patent: October 28, 1997Assignee: Denso CorporationInventors: Yasukazu Aikawa, Yoshiharu Kajikawa, Eiichi Torigoe
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Patent number: 5651268Abstract: An evaporator capable of improving heat-exchange efficiency by enhancing performance to distribute refrigerant to many refrigerant passages of a refrigerant distribution pipe from a throttle. The evaporator is capable of suppressing the occurrence of a refrigerant passing noise by the throttle while maintaining the throttle of a nozzle at a certain size as to be able to function as a throttle. The inner diameter of the throttle in the nozzle is made as large as possible. The cross-sectional center of the throttle of the nozzle is off-centered toward the upper side relative to the cross-sectional center of the refrigerant distribution pipe inserted into the inlet tank of the evaporator. The refrigerant flows out of the throttle in a mixed condition of liquid and gas, and separation of gas and liquid in the refrigerant is alleviated inside the refrigerant distribution chamber.Type: GrantFiled: December 29, 1995Date of Patent: July 29, 1997Assignee: Nippondeso Co., Ltd.Inventors: Yasukazu Aikawa, Yoshiharu Kajikawa, Toshio Ohara
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Patent number: 5524455Abstract: An amount of refrigerant fed to an evaporator 16 is adjusted by an open degree of an expansion valve 6 in accordance to a refrigerant pressure and a refrigerant temperature of an outlet side of the evaporator 16. The evaporator 16 has an evaporation part which includes a refrigerant passage 26 connecting parallel with an inflow passage 22 and an outflow passage 24 and further having a cooled passage 28 which forms a first throttle 30 at the downstream thereof and a cooling passage 32. The cooled passage 28 links the expansion valve 6 and the inflow passage 22. The cooling passage 32 is connected to the outflow passage 24 and leads refrigerant to an outlet. A heat exchange part 20 is provided to be able to of performing heat exchange between the cooled passage 28 and the cooling passage 32. A second throttle is set in a bypass passage 38 which links the upstream side of the cooled passage 28 and the downstream side of the first throttle 30.Type: GrantFiled: March 30, 1995Date of Patent: June 11, 1996Assignee: Nippondenso Co., Ltd.Inventors: Etsuo Hasegawa, Yasushi Yamanaka, Yoshiyuki Yamauchi, Masahiro Shimoya, Toshio Ohara, Yoshiharu Kajikawa, Toshihiro Yamamoto, Kenichi Fujiwara, Shin Nishida, Yoshiaki Takano, Nobuharu Kakehashi
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Patent number: 5481886Abstract: A drain case 4 is disposed between the bottom wall of a unit case and the lower end of refrigerant passage pipes 15 of a stacked type refrigerant evaporator. The drain case 4 is W-shape in cross section, and comprising two pieces of outside inclined walls 32 contacting the side ends of two pieces of tank parts 16 and 17 formed at the lower end side of the refrigerant passage pipes 15, a chevron type protruded wall 33 contacting a recessed part 28 formed at the bottom end of the part between the adjacent two pieces of tank parts 16 and 17, and inside inclined walls 34 having a drain hole 36. In this arrangement, the condensed water flows from the side ends of the two pieces of tank parts 16 and 17 and the part between the two pieces of tank part 16 and 17 into the lower ends thereof reaches the two pieces of outside inclined walls 32 and protruded wall 33 of the drain case 4 before reaching the bottom end of the two pieces of tank parts 16 and 17, and then is efficiently drained therefrom.Type: GrantFiled: May 18, 1994Date of Patent: January 9, 1996Assignee: Nippondenso Co., Ltd.Inventors: Etsuo Hasegawa, Yoshiharu Kajikawa, Takayuki Morita, Suehiro Okazaki, Toshihiro Yamamoto, Toshiya Nagasawa, Shogo Sumi
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Patent number: 5203498Abstract: A heater core supplied with hot water by a cooling water recirculating passageway of an internal combustion engine, and having a plurality of parallel tubes arranged between first and second tanks. The heater core forms a first cooling water flow circuit for creating a U-shaped flow whereby the cooling water from the first tank is introduced into the second tank via a group of tubes and then introduced into the first tank via a different group of tubes, and a second cooling water flow circuit for creating a straight flow from the first tank and second tank. A flow switching valve is provided and is usually switched to the first cooling water flow circuit.Type: GrantFiled: July 22, 1992Date of Patent: April 20, 1993Assignee: Nippondenso Co., Ltd.Inventor: Yoshiharu Kajikawa
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Patent number: 4936108Abstract: A refrigeration system for use in an automotive air conditioner comprises a compressor for compressing vapor-phase refrigerant, a condenser connected to the outlet of the compressor, an expansion valve connected to the outlet of the valve, and a vapor pressure-adjusting valve mounted in the passage extending from the evaporator to the compressor. When the vapor pressure inside this passage is less than a certain value, the adjusting valve reduces the flow of refrigerant from the evaporator to the compressor to maintain the vapor pressure constant. A part of the liquid-phase refrigerant on the downstream side of the condenser is added to the refrigerant evaporated by the evaporator, by means of the adjusting valve.Type: GrantFiled: June 27, 1989Date of Patent: June 26, 1990Assignee: Nippondenso Co., Ltd.Inventors: Shinji Ogawa, Yoshiharu Kajikawa, Isao Kuroyanagi, Norimasa Baba, Toshio Ohara
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Patent number: 4870834Abstract: A refrigeration system for use in an automotive air conditioner comprises a compressor for compressing vapor-phase refrigerant, a condenser connected to the outlet of the compressor, an expansion valve connected to the outlet of the valve, and a vapor pressure-adjusting valve mounted in the passage extending from the evaporator to the compressor. When the vapor pressure inside this passage is less than a certain value, the adjusting valve reduces the flow of refrigerant from the evaporator to the compressor to maintain the vapor pressure constant. A part of the liquid-phase refrigerant on the downstream side of the condenser is added to the refrigerant evaporated by the evaporator, by means of the adjusting valve.Type: GrantFiled: May 27, 1988Date of Patent: October 3, 1989Assignee: Nippondenso Co., Ltd.Inventors: Shinji Ogawa, Yoshiharu Kajikawa, Isao Kuroyanagi, Norimasa Baba, Toshio Ohara