Patents by Inventor Yoshihiro Sumida
Yoshihiro Sumida 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: 6032473Abstract: A refrigerant circulation system of the present invention includes a compressor, a condenser, a evaporator, a throttle device and a control unit. The control unit controls a composition of a refrigerant circulating in the refrigerant circulation system based on a temperature and pressure of the refrigerant of an inlet and outlet portion of the compressor, condenser, evaporator and throttle device. The control unit controls to open and close the throttle device to change the composition of the refrigerant circulating in the refrigerant circulation system.Type: GrantFiled: October 24, 1997Date of Patent: March 7, 2000Assignee: Mitsubishi Denki Kabushiki KaishaInventors: Osamu Morimoto, Fujio Hitomi, Moriya Miyamoto, Hidekazu Tani, Tomohiko Kasai, Yoshihiro Sumida, Hitoshi Iijima
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Patent number: 6023935Abstract: An air conditioner has a refrigeration circuit formed by sequentially connecting a compressor 1, a condenser 2, an electronic expansion valve 4 and an evaporator 7 by pipes (6, 10). A compressor bypass pipe 12 is provided to connect an outlet of the evaporator 7 with an inlet of the condenser 2. A first on-off valve 11 is located in the bypass pipe 12. The air conditioner is controlled to switch to either a forced circulation operation or a natural circulation operation. In the forced circulation operation, the first on-off valve 11 is closed, the expansion valve 4 is opened to a first degree to allow refrigerant to pass therethrough, and the compressor 1 is operated in a running state. In the natural circulation operation, the first on-off valve 11 is opened, the expansion valve 4 is opened to a second degree, different from the first degree, to allow refrigerant to pass therethrough, and the compressor 1 is stopped.Type: GrantFiled: November 9, 1998Date of Patent: February 15, 2000Assignee: Mitsubishi Denki Kabushiki KaishaInventors: Takashi Okazaki, Yoshihiro Sumida, Akihiro Matsushita, Itsutarou Akiyama, Yasunori Shida, Akio Fukushima
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Patent number: 6003323Abstract: In order to modify the composition of a non-azeotropic mixed refrigerant circulating through the refrigeration cycle of a refrigerating and air-conditioning apparatus using a refrigerant rectifier column, the level of the liquid refrigerant rich in the low-boiling point fraction that is obtained from a refrigerant rectifier column (11) and which collects in a refrigerant container (14), as well as the level of the liquid refrigerant rich in the high-boiling point fraction that collects in an accumulator (6) are adjusted so as to modify the composition of the refrigerant circulating through the refrigeration cycle. The circuit structure can be made simple, and the energy need not be supplied during the cooling and heating operations to modify the composition of the non-azeotropic mixed refrigerant.Type: GrantFiled: October 20, 1997Date of Patent: December 21, 1999Assignee: Mitsubshiki Denki Kabushiki KaishaInventors: Yoshihiro Sumida, Keisuke Hokazono, Tomohiko Kasai
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Patent number: 5996358Abstract: In the detection of circulating compositions in the cycle of a non-azeotropic refrigerant composed of three or more kinds of refrigerants, there have been drawbacks in that the number of sensors required is large, and large errors are contained in the circulating composition which can be detected. To overcome these drawbacks, the refrigerating and air-conditioning apparatus comprises at least a compressor, a condenser, a pressure reducing device, and an evaporator, and in a refrigerant cycle which uses as a working refrigerant a non-azeotropic refrigerant composed of N kinds (N.gtoreq.3) of refrigerants and is provided with composition detecting means for detecting the circulating compositions of the non-azeotropic refrigerant, circulating compositions are determined by using (N-2) relations on compositions among a first component to a j-th (2.ltoreq.j.ltoreq.N-1) component of the non-azeotropic refrigerant.Type: GrantFiled: May 27, 1998Date of Patent: December 7, 1999Assignee: Mitsubishi Denki Kabushiki KaishaInventors: Yoshihiro Sumida, Takashi Okazaki, Tomohiko Kasai, Osamu Morimoto, Yoshio Ueno
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Patent number: 5987914Abstract: In a refrigeration cycle using a cooling medium circuit in which a compressor, a heat-source-side heat exchanger, a decompressor, and a user-side heat exchanger are connected successively for circulating a cooling medium, and refrigerating machine oil having no or extremely low mutual solubility to the cooling medium; an internal diameter of a down comer in which a liquid phase cooling medium flows from the upstream side to the down stream side in the refrigeration cycle is adjusted so that the flow velocity of cooling medium in the down comer is made to be higher than that at which refrigerating machine oil floating in a cooling medium goes down.Type: GrantFiled: June 1, 1998Date of Patent: November 23, 1999Assignee: Mitsubishi Denki Kabushiki KaishaInventors: Yoshihiro Sumida, Masahiro Nakayama, Sou Suzuki, Isao Funayama, Kunihiro Morishita
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Patent number: 5987907Abstract: A refrigerant circulation system of the present invention includes a compressor, a condenser, a evaporator, a throttle device and a control unit. The control unit controls a composition of a refrigerant circulating in the refrigerant circulation system based on a temperature and pressure of the refrigerant of an inlet and outlet portion of the compressor, condenser, evaporator and throttle device. The control unit controls to open and close the throttle device to change the composition of the refrigerant circulating in the refrigerant circulation system.Type: GrantFiled: July 23, 1996Date of Patent: November 23, 1999Assignee: Mitsubishi Denki Kabushiki KaishaInventors: Osamu Morimoto, Fujio Hitomi, Moriya Miyamoto, Hidekazu Tani, Tomohiko Kasai, Yoshihiro Sumida, Hitoshi Iijima
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Patent number: 5941084Abstract: A control-information detecting apparatus for a refrigeration air-conditioner using a non-azeotrope refrigerant is equipped with a temperature detector and a pressure detector at the refrigerating cycle of the air-conditioner, which cycle is formed by connecting a compressor, a condenser, a decompressing device, and an evaporator, to detect the temperature and the pressure of the refrigerant circulating the cycle for obtaining the circulation composition of the refrigerant with the composition computing unit thereof. The usual optimum operation of the cycle is thereby enabled even if the circulation composition of the refrigerant has changed.Type: GrantFiled: January 12, 1998Date of Patent: August 24, 1999Assignee: Mitsubishi Denki Kabushiki KaishaInventors: Yoshihiro Sumida, Takashi Okazaki, Osamu Morimoto, Tomohiko Kasai
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Patent number: 5737931Abstract: A refrigerant circulating system using non-azeothropic mixture as refrigerant, which comprises: a main refrigerant circuit connected by a compressor, a fore-way valve, an outdoor heat-exchanger, a first throttling device, a plurality of indoor heat-exchangers, and a low-pressure receiver; a bypass circuit diverging from the discharge portion of the compressor, and extending through a composition detecting heat-exchanger and a second throttling device to a low-pressure portion; an outdoor fun attendant of the outdoor heat-exchanger; first temperature detector to detect a refrigerant temperature at the upstream of the second throttling device; second temperature detector to detect a refrigerant temperature at the downstream of the second throttling device; first pressure detector to detect a pressure at the downstream of the second throttling device; third temperature detector to detect temperature in the main circuit between the first throttling device and the indoor heat-exchanger; forth temperature detectorType: GrantFiled: June 21, 1996Date of Patent: April 14, 1998Assignee: Mitsubishi Denki Kabushiki KaishaInventors: Yoshio Ueno, Osamu Morimoto, Tomohiko Kasai, Yoshihiro Sumida
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Patent number: 5735132Abstract: A control-information detecting apparatus for a refrigeration air-conditioner using a non-azeotrope refrigerant is equipped with a temperature detector and a pressure detector at the refrigerating cycle of the air-conditioner, which cycle is formed by connecting a compressor, a condenser, a decompressing device, and an evaporator, to detect the temperature and the pressure of the refrigerant circulating the cycle for obtaining the circulation composition of the refrigerant with the composition computing unit thereof. The usual optimum operation of the cycle is thereby enabled even if the circulation composition of the refrigerant has changed.Type: GrantFiled: January 7, 1997Date of Patent: April 7, 1998Assignee: Mitsubishi Denki Kabushiki KaishaInventors: Yoshihiro Sumida, Takashi Okazaki, Osamu Morimoto, Tomohiko Kasai
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Patent number: 5732568Abstract: In a refrigerating cycle using a refrigerant containing hydrofluorocarbon as a main component, of a refrigerant pipe arrangement constituting the refrigerating cycle, a refrigerant pipe extending upward from a lower side to an upper side is made to have an inner diameter not larger than a value which makes the flow rate of the refrigerant be not smaller than a zero penetration flow rate. It is possible to obtain a refrigerating cycle superior in oil returning to a compressor and hence high in reliability, even in the case of using refrigerator oil having no compatibility with a refrigerant containing hydrofluorocarbon as a main component.Type: GrantFiled: January 4, 1996Date of Patent: March 31, 1998Assignee: Mitsubishi Denki Kabushiki KaishaInventors: Hiroshige Konishi, Susumu Kawaguchi, Hitoshi Maruyama, Yoshihiro Sumida
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Patent number: 5644840Abstract: To eliminate a fear of electrolytic corrosion even in the case where a heat exchanger to be connected to the outside of the plate-type heat exchanger has a copper piping, and to prevent any damage from being given to the brazed portions of the plate-type heat exchanger at the time of joining pipes and to prevent faults from being generated in joined portions. An intermediate pipe made of a material in which the value of polarization potential becomes lower than that generated between a body of the plate-type heat exchanger and the copper piping is interposed between the plate-type heat exchanger body and the copper piping. Further, the plate-type heat exchanger body is disposed in a position out of a vertical line of a joined portion between the copper piping and the intermediate pipe.Type: GrantFiled: April 14, 1995Date of Patent: July 8, 1997Assignee: Mitsubishi Denki Kabushiki KaishaInventors: Youichi Hisamori, Mitunori Kurachi, Masaaki Taniguchi, Tutomu Noma, Masao Kohashi, Yoshihiro Sumida
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Patent number: 5626026Abstract: A control-information detecting apparatus for a refrigeration air-conditioner using a non-azeotrope refrigerant is equipped with a temperature detector and a pressure detector at the refrigerating cycle of the air-conditioner, which cycle is formed by connecting a compressor, a condenser, a decompressing device, and an evaporator, to detect the temperature and the pressure of the refrigerant circulating the cycle for obtaining the circulation composition of the refrigerant with the composition computing unit thereof. The usual optimum operation of the cycle is thereby enabled even if the circulation composition of the refrigerant has changed.Type: GrantFiled: July 11, 1995Date of Patent: May 6, 1997Assignee: Mitsubishi Denki Kabushiki KaishaInventors: Yoshihiro Sumida, Takashi Okazaki, Osamu Morimoto, Tomohiko Kasai
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Patent number: 5531080Abstract: A refrigerant circulating system that uses a highly polar refrigerant, as typified by a hydrofluorocarbon-based one, and a refrigerating oil that has slight solubility with a liquid refrigerant on the condensation side. Also, a refrigerant circulating cycle that uses a highly polar refrigerant, as typified by a hydrofluorocarbon-based one, and a refrigerating oil that has a slight solubility with a liquid refrigerant and which has a greater specific gravity than the liquid refrigerant. Thereby, it provides a high electrical insulation and moisture resistance, good oil return to the compressor, and high reliability.Type: GrantFiled: July 12, 1994Date of Patent: July 2, 1996Assignee: Mitsubishi Denki Kabushiki KaishaInventors: Takuho Hirahara, Susumu Kawaguchi, Tatsuaki Shimizu, Katsuyuki Kawasaki, Noboru Masuda, Shinobu Ogasawara, Hiroshige Konishi, Hitoshi Maruyama, Yoshihiro Sumida, Akemi Ueyama, Satoru Toyama, Sou Suzuki, Yasushi Akahori
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Patent number: 5517824Abstract: In a refrigerating cycle using a refrigerant containing hydrofluorocarbon as a main component, of a refrigerant pipe arrangement constituting the refrigerating cycle, a refrigerant pipe extending upward from a lower side to an upper side is made to have an inner diameter not larger than a value which makes the flow rate of the refrigerant be not smaller than a zero penetration flow rate. It is possible to obtain a refrigerating cycle superior in oil returning to a compressor and hence high in reliability, even in the case of using refrigerator oil having no compatibility with a refrigerant containing hydrofluorocarbon as a main component.Type: GrantFiled: July 6, 1994Date of Patent: May 21, 1996Assignee: Mitsubishi Denki Kabushiki KaishaInventors: Hiroshige Konishi, Susumu Kawaguchi, Hitoshi Maruyama, Yoshihiro Sumida
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Patent number: 5429183Abstract: To eliminate a fear of electrolytic corrosion even in the case where a heat exchanger to be connected to the outside of the plate-type heat exchanger has a copper piping, and to prevent any damage from being given to the brazed portions of the plate-type heat exchanger at the time of joining pipes and to prevent faults from being generated in joined portions. An intermediate pipe made of a material in which the value of polarization potential becomes lower than that generated between a body of the plate-type heat exchanger and the copper piping is interposed between the plate-type heat exchanger body and the copper piping. Further, the plate-type heat exchanger body is disposed in a position out of a vertical line of a joined portion between the copper piping and the intermediate pipe.Type: GrantFiled: June 14, 1993Date of Patent: July 4, 1995Assignee: Mitsubishi Denki Kabushiki KaishaInventors: Youichi Hisamori, Mitunori Kurachi, Masaaki Taniguchi, Tutomu Noma, Masao Kohashi, Yoshihiro Sumida
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Patent number: 5419144Abstract: A method of assembling a closed loop refrigerating air conditioning system using a hydrofluorocarbon refrigerant by applying a first oil which is insoluble with the hydrocarbon refrigerant to components of a compressor, and storing the insoluble oil within the housing of the compressor in a single or mixed state.Type: GrantFiled: June 13, 1994Date of Patent: May 30, 1995Assignee: Mitsubishi Denki Kabushiki KaishaInventors: Susumu Kawaguchi, Tatsuaki Shimizu, Hiroshige Konishi, Hitoshi Maruyama, Noboru Masuda, Shinobu Ogasawara, Yoshihiro Sumida, Satoru Toyama
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Patent number: 5355695Abstract: A refrigeration device comprising a compressor, a condenser, an evaporator, an accumulator and a refrigerant is described. Lubricating oil present in the compressor is chosen so as to be insoluble with the refrigerant, and a particular accumulator design is described to ensure return of oil back to the compressor.Type: GrantFiled: November 30, 1992Date of Patent: October 18, 1994Assignee: Mitsubishi Denki Kabushiki KaishaInventors: Susumu Kawaguchi, Tatsuaki Shimizu, Hiroshige Konishi, Hitoshi Maruyama, Noboru Masuda, Shinobu Ogasawara, Yoshihiro Sumida, Satoru Toyama
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Patent number: 4987747Abstract: An air conditioning device comprising: a single outdoor unit including a compressor, a four port valve, an outdoor heat exchanger, an accumulator and the like; a plurality of indoor units connected in parallel to the outdoor unit through a first refrigerant-carrying means and a second refrigerant-carrying means; switching valves for selectively connecting one end of the indoor units to either the first refrigerant-carrying means or the second refrigerant-carrying means; and a third refrigerant-carrying means having one end connected to the other end of the indoor units through first flow controllers, and the other end connected to the first refrigerant-carrying means through a second flow controller.Type: GrantFiled: October 4, 1989Date of Patent: January 29, 1991Assignee: Mitsubishi Denki Kabushiki KaishaInventors: Takashi Nakamura, Naoki Tanaka, Hitoshi Iijima, Yoshihiro Sumida