Patents by Inventor Wataru Nakayama

Wataru Nakayama 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: 4431980
    Abstract: A plurality of winding units each composed of a wire element are serially arranged in the axial direction of the winding between an inner insulating sleeve and an outer insulating sleeve, and vertical cooling paths are formed on opposite sides of each winding unit and horizontal cooling paths are formed between adjacent winding units. The winding units are divided into a plurality of winding sub-units to define a central vertical cooling path therebetween, which central vertical cooling path includes a via flow path and a branch inducing flow path, whereby cooling fluid flows in opposite directions and at substantially the same speed in the horizontal cooling paths along upper and lower surfaces of each of the winding units having the branch inducing flow path. In this manner, the entire winding is uniformly cooled.
    Type: Grant
    Filed: September 24, 1982
    Date of Patent: February 14, 1984
    Assignee: Hitachi, Ltd.
    Inventors: Masahiro Ikegawa, Takahiro Daikoku, Wataru Nakayama, Taisei Uede
  • Patent number: 4363013
    Abstract: Winding structure for static electrical induction apparatus such as transformers, reactors, or the like. A winding assembly is disposed in a space formed between a pair of inner and outer insulation continuous walls which are disposed in a container so as to commonly include the vertical axis of the container thereby defining the space therebetween. An inner vertical coolant passage is formed between the winding assembly and the inner insulation wall and an outer vertical coolant passage is also formed between the winding assembly and the inner insulation wall. The winding assembly is composed of a plurality of coil units stacked on one another in the vertical direction with separation at predetermined intervals so as to form horizontal coolant passages between vertically adjacent ones of the coil units, the inner and outer vertical coolant passages communicating with each other through the horizontal coolant passages.
    Type: Grant
    Filed: September 29, 1980
    Date of Patent: December 7, 1982
    Assignee: Hitachi, Ltd.
    Inventors: Takahiro Daikoku, Masahiro Ikegawa, Wataru Nakayama, Taisei Uede
  • Patent number: 4363012
    Abstract: Winding structure for static electrical induction apparatus such as transformers, reactors, or the like. A winding assembly is disposed in a space formed between a pair of inner and outer insulation continuous walls which are disposed in a container so as to commonly include the vertical axis of the container thereby defining the space therebetween. An inner vertical coolant passage is formed between the winding assembly and the inner insulation wall and an outer vertical coolant passage is also formed between the winding assembly and the inner insulation wall. The winding assembly is composed of a plurality of coil units stacked on one another in the vertical direction with separation at predetermined intervals so as to form horizontal coolant passages between vertically adjacent ones of the coil units, the inner and outer vertical coolant passages communicating with each other through the horizontal coolant passages.
    Type: Grant
    Filed: September 29, 1980
    Date of Patent: December 7, 1982
    Assignee: Hitachi, Ltd.
    Inventors: Takahiro Daikoku, Masahiro Ikegawa, Wataru Nakayama, Taisei Uede
  • Patent number: 4335324
    Abstract: A rotor for hydrogen-cooled rotary electric machines is provided with a gas inlet chamber and a gas outlet chamber which are circumferentially defined by radially extending partition walls and disposed in a region between a retaining ring holding field windings in position and a rotor shaft. The gas outlet chamber is divided into a first zone located near the polar axis and a second zone located near the interpolar axis.Rotor cooling gas is introduced through a gas inlet port to the gas inlet chamber to flow to the gas outlet chamber divided into a plurality of zones while cooling the field windings. From the gas outlet chamber, the gas is discharged through axially extending passages and fan-like ventilating devices to the outside of the rotor.
    Type: Grant
    Filed: August 6, 1980
    Date of Patent: June 15, 1982
    Assignee: Hitachi, Ltd.
    Inventors: Kazumasa Fujioka, Wataru Nakayama
  • Patent number: 4311931
    Abstract: A rotor for hydrogen-cooled rotary electric machines is provided with a gas inlet chamber and a gas outlet chamber which are circumferentially defined by radially extending partition walls and disposed in a region between a retaining ring holding rotor windings in position and a rotor shaft. Rotor cooling gas is introduced through a gas inlet port to a gas inlet chamber to flow to a gas outlet chamber divided into a plurality of zones while cooling the rotor windings. Form the gas outlet chamber, the gas flows through axially extending passages to a plurality of fan-like ventilating means to be discharged outside of the rotor.
    Type: Grant
    Filed: October 19, 1979
    Date of Patent: January 19, 1982
    Assignee: Hitachi, Ltd.
    Inventors: Kazumasa Fujioka, Wataru Nakayama
  • Patent number: 4246503
    Abstract: A hermetic casing filled with a cooling gas contains a stator core having cooling ducts in radial direction, and a rotor comprised of a rotor body and an end-winding region and a fan for circulating the cooling gas. The cooled gas is divided into two flows at fan outlet by the dividing wall. One gas flow pressurized by the fan makes its way to the rotor end region and cools the same, and is discharged to the armature end region. The other gas flow pressurized by the gas goes to the stator core and the rotor body and cools the same, and then is discharged to the inlet side of the cooler. The two gas flows merge with each other at the inlet of the cooler, is cooled through the cooler, and reach the fan inlet region.
    Type: Grant
    Filed: December 13, 1978
    Date of Patent: January 20, 1981
    Assignee: Hitachi, Ltd.
    Inventors: Kazumasa Fujioka, Wataru Nakayama
  • Patent number: 4245206
    Abstract: Winding structure for static electrical induction apparatus such as transformers, reactors, or the like. A winding assembly is disposed in a space formed between a pair of inner and outer insulation continuous walls which are disposed in a container so as to commonly include the vertical axis of the container thereby defining the space therebetween. An inner vertical coolant passage is formed between the winding assembly and the inner insulation wall and an outer vertical coolant passage is also formed between the winding assembly and the inner insulation wall. The winding assembly is composed of a plurality of coil units stacked on one another in the vertical direction with separation at predetermined intervals so as to form horizontal coolant passages between vertically adjacent ones of the coil units, the inner and outer vertical coolant passages communicating with each other through the horizontal coolant passages.
    Type: Grant
    Filed: March 22, 1978
    Date of Patent: January 13, 1981
    Assignee: Hitachi, Ltd.
    Inventors: Takahiro Daikoku, Masahiro Ikegawa, Wataru Nakayama, Taisei Uede
  • Patent number: 4207550
    Abstract: A plurality of winding units mounted about a magnetic core structure, each of which consisting of wound wire elements, are disposed and stacked in an annular space defined by a coaxial inner and outer insulating sleeves, so as to form a winding structure for electric devices. Vertical passages for cooling fluid are defined at both sides of the winding units, while horizontal passages for the cooling fluid are formed between adjacent winding units. A plurality of peripherally continuous flow controlling bodies are disposed in either one of the vertical passages at a two vertical pitches of the winding unit, so as to confront alternating ones of the winding units. Alternatively, the flow controlling bodies are disposed alternatingly in both vertical passages, in such a manner that the flow controlling bodies disposed in one of the vertical passages confront alternating ones of said winding units which are not confronted by the flow controlling bodies disposed in the other vertical passage.
    Type: Grant
    Filed: February 23, 1978
    Date of Patent: June 10, 1980
    Assignee: Hitachi, Ltd.
    Inventors: Takahiro Daikoku, Wataru Nakayama, Taisei Uede
  • Patent number: 4195688
    Abstract: A heat-transfer wall kept at a low temperature so that hot vapor brought into contact with its surface condenses thereon. The surface is grooved at a fine pitch, having thin and sharply tapering ridges in between, with shallower fine-pitch grooves or notches formed in the ridges. The wall may be that of a tube, the grooves may consist of a continuous root in the form of a helix, and the ridges may be bent into the grooves to form rounded crests. The wall contour is made by forming fine-pitch shallow grooves crosswise by knurling and then forming fine-pitch deep grooves by cutting and turning up the surfaces in a plowing manner, for example on a lathe. A grooved die may be used to deform and bend the edges of the ridges toward the deep grooves.
    Type: Grant
    Filed: June 30, 1978
    Date of Patent: April 1, 1980
    Assignees: Hitachi, Ltd., Hitachi Cable, Ltd.
    Inventors: Kunio Fujie, Wataru Nakayama, Heikichi Kuwahara, Takahiro Daikoku, Kimio Kakizaki
  • Patent number: 4194384
    Abstract: A method of manufacturing a heat-transfer wall for vapor condensation comprising the step of forming on the heat-transfer surface, a number of shallow grooves substantially in parallel at a fine pitch, and then forming, on the heat-transfer surface and in the direction across said shallow grooves, a number of grooves deeper than the shallow grooves at a fine pitch by cutting and turning up the heat-transfer surface in the plowing manner. Said method may further comprise a subsequent step of curling the edges of the ridges formed in the above-mentioned step into said deep grooves.
    Type: Grant
    Filed: June 8, 1978
    Date of Patent: March 25, 1980
    Assignees: Hitachi, Ltd., Hitachi Cable, Ltd.
    Inventors: Kunio Fujie, Wataru Nakayama, Heikichi Kuwahara, Takahiro Daikoku, Kimio Kakizaki
  • Patent number: 4166498
    Abstract: A condensing, a heat-transfer wall for liquefying vapor having a temperature higher than the wall by bringing the vapor in contact therewith. There are provided many parallel grooves in the basic surface of the heat-transfer wall, thereby defining ridge portions or build-up portions thereamong. These ridge portions have their tip portions tapered at sharp acute angle. Recessed or concave portions are provided in the tip portions of these ridge portions, and these recessed portions have their surfaces inclined to the basic surface of the heat-transfer wall. The width of the respective grooves ranges from 0.05 to 2.5 mm, and the depth thereof is not more than 10 mm. The thickness of the respective ridge portions ranges from 0.01 to 2.5 mm, and the height there of is not more than 10 mm. The depth of the recessed portions ranges from 0.02 to 0.8 times the depth of the grooves, and the pitch of recessed portion is not more than 2.0 mm. The width of the tip portions of the portions is 0.01 to 1.
    Type: Grant
    Filed: July 12, 1977
    Date of Patent: September 4, 1979
    Assignees: Hitachi, Ltd., Hitachi Cable, Ltd.
    Inventors: Kunio Fujie, Wataru Nakayama, Takahiro Daikoku, Shigeki Hirasawa, Kimio Kakizaki
  • Patent number: 4060125
    Abstract: A heat transfer wall for boiling liquids having a multiplicity of minute tunnels parallelly extending and spaced a distance of not more than 1 mm under the metal wall surface in contact with liquid. Each tunnel is communicated with the outside by a multiplicity of tiny holes formed at regular intervals of not more than 1 mm along the tunnel. The wall surface portion is in one piece with the wall body. The holes combinedly account for from 2 to 50% of the total surface area of the wall. The regularly formed holes are substantially triangular shaped. The wall is made of either copper or aluminum.
    Type: Grant
    Filed: June 16, 1975
    Date of Patent: November 29, 1977
    Assignees: Hitachi Cable, Ltd., Hitachi, Ltd.
    Inventors: Kunio Fujie, Wataru Nakayama, Heikichi Kuwahara, Kimio Kakizaki
  • Patent number: 4044797
    Abstract: A heat transfer pipe for use in a heat exchanger such as air conditioner, freezer and boiler, wherein grooves are formed in the inner wall surface of the pipe, which are by far finer in size than the grooves that have been provided for the purpose of increasing the heat transfer area in general, and slanting relative to the axis of pipe, to thereby improve the heat transfer rate without increasing the pressure loss caused to the fluid flowing through the pipe.
    Type: Grant
    Filed: November 14, 1975
    Date of Patent: August 30, 1977
    Assignee: Hitachi, Ltd.
    Inventors: Kunio Fujie, Masaaki Itoh, Tamio Innami, Hideyuki Kimura, Wataru Nakayama, Takehiko Yanagida