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).

  • Patent number: 6032473
    Abstract: 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: Grant
    Filed: October 24, 1997
    Date of Patent: March 7, 2000
    Assignee: Mitsubishi Denki Kabushiki Kaisha
    Inventors: Osamu Morimoto, Fujio Hitomi, Moriya Miyamoto, Hidekazu Tani, Tomohiko Kasai, Yoshihiro Sumida, Hitoshi Iijima
  • Patent number: 6023935
    Abstract: 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: Grant
    Filed: November 9, 1998
    Date of Patent: February 15, 2000
    Assignee: Mitsubishi Denki Kabushiki Kaisha
    Inventors: Takashi Okazaki, Yoshihiro Sumida, Akihiro Matsushita, Itsutarou Akiyama, Yasunori Shida, Akio Fukushima
  • Patent number: 6003323
    Abstract: 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: Grant
    Filed: October 20, 1997
    Date of Patent: December 21, 1999
    Assignee: Mitsubshiki Denki Kabushiki Kaisha
    Inventors: Yoshihiro Sumida, Keisuke Hokazono, Tomohiko Kasai
  • Patent number: 5996358
    Abstract: 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: Grant
    Filed: May 27, 1998
    Date of Patent: December 7, 1999
    Assignee: Mitsubishi Denki Kabushiki Kaisha
    Inventors: Yoshihiro Sumida, Takashi Okazaki, Tomohiko Kasai, Osamu Morimoto, Yoshio Ueno
  • Patent number: 5987907
    Abstract: 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: Grant
    Filed: July 23, 1996
    Date of Patent: November 23, 1999
    Assignee: Mitsubishi Denki Kabushiki Kaisha
    Inventors: Osamu Morimoto, Fujio Hitomi, Moriya Miyamoto, Hidekazu Tani, Tomohiko Kasai, Yoshihiro Sumida, Hitoshi Iijima
  • Patent number: 5987914
    Abstract: 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: Grant
    Filed: June 1, 1998
    Date of Patent: November 23, 1999
    Assignee: Mitsubishi Denki Kabushiki Kaisha
    Inventors: Yoshihiro Sumida, Masahiro Nakayama, Sou Suzuki, Isao Funayama, Kunihiro Morishita
  • Patent number: 5941084
    Abstract: 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: Grant
    Filed: January 12, 1998
    Date of Patent: August 24, 1999
    Assignee: Mitsubishi Denki Kabushiki Kaisha
    Inventors: Yoshihiro Sumida, Takashi Okazaki, Osamu Morimoto, Tomohiko Kasai
  • Patent number: 5737931
    Abstract: 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 detector
    Type: Grant
    Filed: June 21, 1996
    Date of Patent: April 14, 1998
    Assignee: Mitsubishi Denki Kabushiki Kaisha
    Inventors: Yoshio Ueno, Osamu Morimoto, Tomohiko Kasai, Yoshihiro Sumida
  • Patent number: 5735132
    Abstract: 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: Grant
    Filed: January 7, 1997
    Date of Patent: April 7, 1998
    Assignee: Mitsubishi Denki Kabushiki Kaisha
    Inventors: Yoshihiro Sumida, Takashi Okazaki, Osamu Morimoto, Tomohiko Kasai
  • Patent number: 5732568
    Abstract: 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: Grant
    Filed: January 4, 1996
    Date of Patent: March 31, 1998
    Assignee: Mitsubishi Denki Kabushiki Kaisha
    Inventors: Hiroshige Konishi, Susumu Kawaguchi, Hitoshi Maruyama, Yoshihiro Sumida
  • Patent number: 5644840
    Abstract: 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: Grant
    Filed: April 14, 1995
    Date of Patent: July 8, 1997
    Assignee: Mitsubishi Denki Kabushiki Kaisha
    Inventors: Youichi Hisamori, Mitunori Kurachi, Masaaki Taniguchi, Tutomu Noma, Masao Kohashi, Yoshihiro Sumida
  • Patent number: 5626026
    Abstract: 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: Grant
    Filed: July 11, 1995
    Date of Patent: May 6, 1997
    Assignee: Mitsubishi Denki Kabushiki Kaisha
    Inventors: Yoshihiro Sumida, Takashi Okazaki, Osamu Morimoto, Tomohiko Kasai
  • Patent number: 5531080
    Abstract: 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: Grant
    Filed: July 12, 1994
    Date of Patent: July 2, 1996
    Assignee: Mitsubishi Denki Kabushiki Kaisha
    Inventors: 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
  • Patent number: 5517824
    Abstract: 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: Grant
    Filed: July 6, 1994
    Date of Patent: May 21, 1996
    Assignee: Mitsubishi Denki Kabushiki Kaisha
    Inventors: Hiroshige Konishi, Susumu Kawaguchi, Hitoshi Maruyama, Yoshihiro Sumida
  • Patent number: 5429183
    Abstract: 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: Grant
    Filed: June 14, 1993
    Date of Patent: July 4, 1995
    Assignee: Mitsubishi Denki Kabushiki Kaisha
    Inventors: Youichi Hisamori, Mitunori Kurachi, Masaaki Taniguchi, Tutomu Noma, Masao Kohashi, Yoshihiro Sumida
  • Patent number: 5419144
    Abstract: 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: Grant
    Filed: June 13, 1994
    Date of Patent: May 30, 1995
    Assignee: Mitsubishi Denki Kabushiki Kaisha
    Inventors: Susumu Kawaguchi, Tatsuaki Shimizu, Hiroshige Konishi, Hitoshi Maruyama, Noboru Masuda, Shinobu Ogasawara, Yoshihiro Sumida, Satoru Toyama
  • Patent number: 5355695
    Abstract: 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: Grant
    Filed: November 30, 1992
    Date of Patent: October 18, 1994
    Assignee: Mitsubishi Denki Kabushiki Kaisha
    Inventors: Susumu Kawaguchi, Tatsuaki Shimizu, Hiroshige Konishi, Hitoshi Maruyama, Noboru Masuda, Shinobu Ogasawara, Yoshihiro Sumida, Satoru Toyama
  • Patent number: 4987747
    Abstract: 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: Grant
    Filed: October 4, 1989
    Date of Patent: January 29, 1991
    Assignee: Mitsubishi Denki Kabushiki Kaisha
    Inventors: Takashi Nakamura, Naoki Tanaka, Hitoshi Iijima, Yoshihiro Sumida