Patents by Inventor Michihiko Aizawa
Michihiko Aizawa 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: 7165418Abstract: An absorption refrigerator includes a high temperature regenerator for heating a water solution including a halogen compound to generate steam. An oxide film having thickness of 0.02–5.0 ?m, one of the colors blue, purple and gray, or a hydroxyl group is formed on a surface of at least one of the high temperature regenerators and the heat exchanger.Type: GrantFiled: May 21, 2004Date of Patent: January 23, 2007Assignee: Hitachi, Ltd.Inventors: Katsumi Mabuchi, Heihatiro Midorikawa, Tomoko Kikuchi, Takashi Honda, Michihiko Aizawa, Masahiko Ito
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Patent number: 6813901Abstract: An absorption refrigerator includes a high temperature regenerator for heating a water solution including a halogen compound to generate steam. An oxide film having thickness of 0.02-5.0 &mgr;m, one of the colors blue, purple and gray, or a hydroxyl group is formed on a surface of at least one of the high temperature regenerators and the heat exchanger.Type: GrantFiled: April 20, 2001Date of Patent: November 9, 2004Assignee: Hitachi, Ltd.Inventors: Katsumi Mabuchi, Heihatiro Midorikawa, Tomoko Kikuchi, Takashi Honda, Michihiko Aizawa, Masahiko Ito
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Publication number: 20040211214Abstract: An absorption refrigerator includes a high temperature regenerator for heating a water solution including a halogen compound to generate steam. An oxide film having thickness of 0.02-5.0 &mgr;m, one of the colors blue, purple and gray, or a hydroxyl group is formed on a surface of at least one of the high temperature regenerators and the heat exchanger.Type: ApplicationFiled: May 21, 2004Publication date: October 28, 2004Inventors: Katsumi Mabuchi, Heihatiro Midorikawa, Tomoko Kikuchi, Takashi Honda, Michihiko Aizawa, Masahiko Ito
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Publication number: 20010029746Abstract: An absorption refrigerator includes a high temperature regenerator for heating a water solution including a halogen compound to generate steam. An oxide film having thickness of 0.02-5.0 &mgr;m, one of the colors blue, purple and gray, or a hydroxyl group is formed on a surface of at least one of the high temperature regenerators and the heat exchanger.Type: ApplicationFiled: April 20, 2001Publication date: October 18, 2001Inventors: Katsumi Mabuchi, Heihatiro Midorikawa, Tomoko Kikuchi, Takashi Honda, Michihiko Aizawa, Masahiko Ito
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Patent number: 6279342Abstract: An absorption refrigerator includes a high temperature regenerator for heating a water solution including a halogen compound to generate steam. An oxide film having thickness of 0.02-5.0 &mgr;m, one of the colors blue, purple and gray, or a hydroxyl group is formed on a surface of at least one of the high temperature regenerators and the heat exchanger.Type: GrantFiled: July 28, 1999Date of Patent: August 28, 2001Assignee: Hitachi Ltd.Inventors: Katsumi Mabuchi, Heihatiro Midorikawa, Tomoko Kikuchi, Takashi Honda, Michihiko Aizawa, Masahiko Ito
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Patent number: 6233968Abstract: There is disclosed an absorption refrigerating machine in which evaporators as well as absorbers are arranged in a two-stage manner. A refrigerant, heated by a regenerator, is condensed by a condenser, and then is fed to a first evaporator. The refrigerant, produced in the first evaporator, is absorbed by a first absorber, formed integrally with the first evaporator, and is formed into an intermediate solution, and then is fed to a second absorber. The second absorber comprises a spray absorber which obviates the need for providing a heat-transfer pipe therein. The condensed refrigerant is supplied to a second evaporator, formed integrally with the second absorber, from a refrigerant tank formed at a lower portion of the condenser or at a lower portion of the first evaporator. The refrigerant, fed to the second evaporator, is absorbed by the solution sprayed in a supercooled condition in the second absorber, thereby producing a dilute solution.Type: GrantFiled: July 18, 2000Date of Patent: May 22, 2001Assignee: Hitachi, Ltd.Inventors: Akira Nishiguchi, Ryoko Sakiyama, Tomihisa Ohuchi, Michihiko Aizawa
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Patent number: 6122930Abstract: There is disclosed an absorption refrigerating machine in which evaporators as well as absorbers are arranged in a two-stage manner. A refrigerant, heated by a regenerator, is condensed by a condenser, and then is fed to a first evaporator. The refrigerant, produced in the first evaporator, is absorbed by a first absorber, formed integrally with the first evaporator, and is formed into an intermediate solution, and then is fed to a second absorber. The second absorber comprises a spray absorber which obviates the need for providing a heat-transfer pipe therein. The condensed refrigerant is supplied to a second evaporator, formed integrally with the second absorber, from a refrigerant tank formed at a lower portion of the condenser or at a lower portion of the first evaporator. The refrigerant, fed to the second evaporator, is absorbed by the solution sprayed in a supercooled condition in the second absorber, thereby producing a dilute solution.Type: GrantFiled: February 10, 1999Date of Patent: September 26, 2000Assignee: Hitachi, Ltd.Inventors: Akira Nishiguchi, Ryoko Sakiyama, Tomihisa Ohuchi, Michihiko Aizawa
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Patent number: 5964103Abstract: An absorption refrigerator uses water as a refrigerant and a halogen compound as an absorption solution, and is characterized in that an oxide film of thickness of 0.02-5.0 .mu.m is formed on a surface of at least one of a heat exchanger and a high temperature regenerator. And a production method of the absorption refrigerator is characterized by oxidizing a surface of at least one of a heat exchanger and a high temperature regenerator at a temperature of 200-800.degree. C., and adjusting a heating temperature and a heating retaining time so that a value of parameter (P), obtained according to P=T (5+log t) is 3.5-6.0.times.10.sup.3, wherein T represents heating temperature (.degree.K), and t heating retaining time (minute).Type: GrantFiled: June 19, 1998Date of Patent: October 12, 1999Assignee: Hitachi, Ltd.Inventors: Katsumi Mabuchi, Heihatiro Midorikawa, Tomoko Kikuchi, Takashi Honda, Michihiko Aizawa, Masahiko Ito
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Patent number: 5806337Abstract: An absorption refrigerator uses water as a refrigerant and a halogen compound as an absorption solution, and is characterized in that an oxide film of thickness of 0.02-5.0 .mu.m is formed on a surface of at least one of a heat exchanger and a high temperature regenerator. And a production method of the absorption refrigerator is characterized by oxidizing a surface of at least one of a heat exchanger and a high temperature regenerator at a temperature of 200.degree.-800.degree. C., and adjusting a heating temperature and a heating retaining time so that a value of parameter(P), obtained according to P=T (5+log t) is 3.5-6.0.times.10.sup.3, wherein T represents heating temperature (.degree.K), and t heating retaining time (minute).Type: GrantFiled: September 27, 1996Date of Patent: September 15, 1998Assignee: Hitachi, Ltd.Inventors: Katsumi Mabuchi, Heihatiro Midorikawa, Tomoko Kikuchi, Takashi Honda, Michihiko Aizawa, Masahiko Ito
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Patent number: 5517830Abstract: The capacity control range of an interior unit of a multiple type absorption air conditioning system is increased, and turning on and off of cooling/heating and switch over between the cooling and heating can be readily and safely performed. The capacity control range is increased by reserving a liquid refrigerant in an absorption cool/warm water unit. An interior unit is connected to the absorption cool/warm water unit by a communication device. The operation of the cool/warm water unit caused by turning on and off the system and switch over between cooling and heating are automatically controlled by an operation control device. Consequently, the operation is simplified, and safety is improved.Type: GrantFiled: January 26, 1995Date of Patent: May 21, 1996Assignee: Hitachi, Ltd.Inventors: Tomihisa Ohuchi, Akira Nishiguchi, Seiichiro Sakaguchi, Daisuke Hisajima, Michihiko Aizawa, Takashi Nakao, Yasuo Koseki, Kyoji Kohno
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Patent number: 5463880Abstract: An absorption refrigerator is characterized by an absorber which has a tube bank of heat-conductive tubes in the absorber, a vapor flow passage between the tube bank and a side wall of the absorber which is opposite to and separated from the tube bank in a radial direction of the heat-conductive tubes by a distance equal to or larger than a maximum pitch of the heat-conductive tubes, at least a baffle plate disposed in the vapor flow passage, and a gas extraction port disposed outside the tube bank. A further arrangement is characterized by an absorber having a tube bank in the absorber, a vapor flow passage between the tube bank and a side wall of the absorber, and a gas extraction port disposed around a central portion of the tube bank.Type: GrantFiled: February 7, 1994Date of Patent: November 7, 1995Assignee: Hitachi, Ltd.Inventors: Yoshitaka Nishino, Toshio Sawa, Takashi Nakao, Michihiko Aizawa, Kenji Yokose
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Patent number: 5447042Abstract: The capacity control range of an interior unit of a multiple type absorption air conditioning system is enlarged, and turning on and off of cooling/heating and switch over between the cooling and heating can be readily and safely performed. The capacity control range is increased by reserving a liquid refrigerant in an absorption cool/warm water unit. An interior unit is connected to the absorption cool/warm water unit by a communication device. The operation of the cool/warm water unit caused by turning on and off the system and switch over between cooling and heating are automatically controlled by an operation control device. Consequently, the operation is simplified, and safety is improved.Type: GrantFiled: February 1, 1994Date of Patent: September 5, 1995Assignee: Hitachi, Ltd.Inventors: Tomihisa Ohuchi, Akira Nishiguchi, Seiichiro Sakaguchi, Daisuke Hisajima, Michihiko Aizawa, Takashi Nakao, Yasuo Koseki, Kyoji Kohno
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Patent number: 5435154Abstract: A high temperature regenerator of an absorption type hot and cold water generator and an absorption type hot and cold water generator capable of preventing corrosion from occurring by preventing local overheating at the heat transfer surface of the high temperature regenerator and capable of being miniaturized. The high temperature regenerator includes an outer case, an inner case, a plurality of solution pipes, a burner, a solution flow-in pipe, and a gas/liquid separation plate. The inner case is inside the outer case, and a solution is kept between the cases, with the inner case being submerged within this solution. The burner is mounted on the side of the outer case in such a way that heat can be supplied through the inner case, with the inside of the inner case serving as a combustion chamber.Type: GrantFiled: January 14, 1994Date of Patent: July 25, 1995Assignee: Hitachi, Ltd.Inventors: Akira Nishiguchi, Tomihisa Ohuchi, Shigeo Sugimoto, Michihiko Aizawa, Takao Naruse, Yasuo Uraki
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Patent number: 5282369Abstract: The capacity control range of an interior unit of a multiple type absorption air conditioning system is increased, and turning on and off of cooling/heating and switch over between the cooling and heating can be readily and safely performed. The capacity control range is increased by reserving a liquid refrigerant in an absorption cool/warm water unit. An interior unit is connected to the absorption cool/warm water unit by a communication device. The operation of the cool/warm water unit caused by turning on and off the system and switch over between cooling and heating are automatically controlled by an operation control device. Consequently, the operation is simplified, and safety is improved.Type: GrantFiled: March 30, 1992Date of Patent: February 1, 1994Assignee: Hitachi, Ltd.Inventors: Tomihisa Ohuchi, Akira Nishiguchi, Seiichiro Sakaguchi, Daisuke Hisajima, Michihiko Aizawa, Takashi Nakao, Yasuo Koseki, Kyoji Kohno
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Patent number: 5275010Abstract: An individual air conditioning system with an absorption chiller heater having a controllable capacity, with thermal input to a burner of a high temperature regenerator being controlled by on-off control or the like even if the load is low. The temperature of cooling water is controlled in accordance with a concentration of refrigerant in an absorber, so that the refrigerating capacity of the absorption chiller heater can be freely varied from 0% to 100% without the refrigerant being frozen.Type: GrantFiled: August 21, 1992Date of Patent: January 4, 1994Assignee: Hitachi, Ltd.Inventors: Daisuke Hisajima, Tomihisa Ohuchi, Akira Nishiguchi, Yasuo Koseki, Michihiko Aizawa, Hiroaki Yoda, Takashi Nakao
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Patent number: 5259202Abstract: In an absorption air-conditioning system, in order to immediately stop indoor air-conditions by a stop signal of the indoor air-conditioners and improve characteristics for activating the system , such as, by effecting re-activation at a relatively short time interval after stopping the operation of the system, when the last one of the operating indoor air-conditioners is stopped, a stop signal is sent to a control device from a controller for the indoor air-conditioner, and in response to this signal, the control device effects the control of stopping a burner, a cooling medium circulating pump, a cooling water pump and a cold/hot water, pump. A solution circulating pump, however, continues operating and the solution, while kept at a high concentration, is circulated through an absorber, a high-temperature regenerator and a low-temperature regenerator.Type: GrantFiled: January 29, 1992Date of Patent: November 9, 1993Assignee: Hitachi, Ltd.Inventors: Akira Nishiguchi, Tomihisa Ohuchi, Daisuke Hisajima, Michihiko Aizawa
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Patent number: 5218844Abstract: An absorption heat pump apparatus is so formed that solution which has absorbed coolant vapor in absorber to increase in temperature, liquid coolant into which coolant vapor heat been condensed in a condenser, and coolant which has decreased in temperature through flash evaporation of coolant vapor in an evaporator are delivered directly to heat exchangers so as to exchange heat with the outdoor air, respectively. This arrangement makes the use of cold water and cooling water as well as equipment therefor and maintenance thereof unnecessary.Type: GrantFiled: February 11, 1991Date of Patent: June 15, 1993Assignee: Hitachi, Ltd.Inventors: Akira Nishiguchi, Tomihisa Ohuchi, Seiichiro Sakaguchi, Daisuke Hisajima, Michihiko Aizawa
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Patent number: 5205137Abstract: An absorption air conditioner having a regenerating chamber for heating and condensing a portion of a dilute solution generated in an absorber and an absorption chamber for causing refrigerant vapor generated in the regenerating chamber to be absorbed into said dilute solution which is at an intermediate position in the passage connected from the absorber to the regenerator so that the size of the absorber is reduced and the overall size of the absorption air conditioner is reduced.Type: GrantFiled: September 5, 1991Date of Patent: April 27, 1993Assignee: Hitachi, Ltd.Inventors: Tomihisa Ohuchi, Akira Nishiguchi, Daisuke Hisajima, Seiichiro Sakaguchi, Yoshifumi Kunugi, Michihiko Aizawa, Katsuya Ebara, Hiroaki Yoda
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Patent number: 5205352Abstract: A heat exchanger for condensing into liquid phase a vapor containing non-condensable gas components through heat exchange with a heat exchanging medium has a vessel having a vapor inlet for receiving the vapor containing the non-condensable gas components and a discharge port for the non-condensable gas components. The heat exchanger further has a tube nest disposed in the vessel and having a plurality of tubes through which the heat exchanging medium flows. The vapor containing non-condensable gas components flows towards the discharge port across the tube nest so as to be condensed into liquid phase through heat exchange with the heat exchanging medium flowing through the tubes, so that the non-condensable gas components are separated from the liquid phase and flow towards the discharge port.Type: GrantFiled: January 29, 1992Date of Patent: April 27, 1993Assignee: Hitachi, Ltd.Inventors: Fumio Takahashi, Iwao Harada, Yasuo Fujitani, Michihiko Aizawa
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Patent number: 5048308Abstract: An absorber comprises a vapor absorption portion including at least two flow paths through which an absorption solution flows down and absorbs a cooling medium vapor, at least two solution cooling portions separated from, and juxtaposed with, the vapor absorption portion and solution circulation for circulating a cooling medium vapor between the solution cooling portion and the vapor absorption portion. In this manner, a refrigerator can be made compact in size and cycle efficiency can be improved.Type: GrantFiled: June 15, 1990Date of Patent: September 17, 1991Assignee: Hitachi, Ltd.Inventors: Daisuke Hisajima, Tomihisa Ohuchi, Seiichiro Sakaguchi, Toshifumi Kunugi, Michihiko Aizawa