Patents by Inventor Jun Kasai

Jun Kasai 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: 9127836
    Abstract: A combustion burner 1 includes a fuel nozzle 2 that injects fuel gas prepared by mixing solid fuel and primary air, secondary air nozzles 3, 4 that inject secondary air from the outer periphery of the fuel nozzle 2, and a flame holder 5 that is arranged in an opening of the fuel nozzle 2. In the combustion burner 1, the flame holder 5 has a splitting shape that widens in the flow direction of the fuel gas. When seen in cross section along a direction in which the flame holder 5 widens, the cross section passing through the central axis of the fuel nozzle 2, a maximum distance h from the central axis of the fuel nozzle 2 to the widened end of the flame holder 5 and an inside diameter r of the opening 21 of the fuel nozzle 2 satisfy h/(r/2)<0.6.
    Type: Grant
    Filed: March 11, 2010
    Date of Patent: September 8, 2015
    Assignee: MITSUBISHI HEAVY INDUSTRIES, LTD.
    Inventors: Keigo Matsumoto, Koutaro Fujimura, Kazuhiro Domoto, Toshimitsu Ichinose, Naofumi Abe, Jun Kasai
  • Patent number: 8997665
    Abstract: A leading end located in a two-stage entrained-flow bed coal gasifier has a double-walled structure including an outer cylinder and an inner cylinder, and cooling water for cooling the leading end is supplied through an interior of the inner cylinder to cool the leading end and is then returned to a base end through a space formed between the outer cylinder and the inner cylinder. The space formed between the outer cylinder and the inner cylinder has a smaller channel area than the interior of the inner cylinder, and a swirling flow along a guide formed on an outer circumferential surface of the inner cylinder and a substantially linear flow in a longitudinal direction of the outer cylinder and the inner cylinder are applied to the cooling water returned to the base end through the space formed between the outer cylinder and the inner cylinder.
    Type: Grant
    Filed: October 5, 2009
    Date of Patent: April 7, 2015
    Assignees: Mitsubishi Hitachi Power Systems, Ltd., Joban Joint Power Co., Ltd., Hokkaido Electric Power Company, Incorporated, Tohoku Electric Power Co., Inc., The Tokyo Electric Power Company, Incorporated, Chubu Electric Power Co. Inc., Hokuriku Electric Power Company, The Kansai Electric Power Co., Inc., The Chugoku Electric Power Co., Inc., Shikoku Electric Power Co., Inc., Kyushu Electric Power Co., Inc., Electric Power Development Co., Ltd., Central Research Institute of Electric Power Industry
    Inventors: Shinya Hamasaki, Toshimi Ohtsuka, Yoshinori Koyama, Katsuhiko Yokohama, Yasunari Shibata, Jun Kasai
  • Publication number: 20150066399
    Abstract: A circuit board testing apparatus detects sparking and partial discharge between wiring patterns on a circuit board to determine if the circuit board is defective. A constant current source feeds a constant current to a wiring pattern to be tested. A voltage measurement part measures the resulting voltage at the wiring pattern. A normal state voltage gradient calculation part calculates a voltage gradient in a normal state where there is no sparking or partial discharge. A determination part determines whether the voltage gradient remains invariant, by comparing voltage measurement results within a predetermined range with an estimated value of the voltage based on the voltage gradient in the normal state. The determination part determines whether a circuit board is defective, on the basis of whether the voltage gradient remains invariant.
    Type: Application
    Filed: August 27, 2014
    Publication date: March 5, 2015
    Applicant: NIDEC-READ CORPORATION
    Inventor: Jun Kasai
  • Publication number: 20140356795
    Abstract: An oil-fired burner (30A) for warming, disposed adjacent to the outer periphery of a pulverized coal burner which inputs pulverized coal and air into a furnace, includes: an oil gun (32) for inputting an oil fuel disposed at the center of an outlet opening of a nozzle main body (31) substantially rectangular in cross-section; and a secondary air input port (40) disposed so as to surround the outer periphery of the oil gun (32), wherein the secondary air input port (40) is constituted of: a central arc section (41) substantially similar in shape to a circular diffuser (34) mounted on the leading end side of the oil gun (32); and rectangular sections (42L, 42R) provided continuously from both sides of the central arc section (41) and narrowed in face-to-face dimension in the direction of the adjacent pulverized coal burners so as to increase the distance from them.
    Type: Application
    Filed: October 31, 2012
    Publication date: December 4, 2014
    Applicant: MITSUBISHI HEAVY INDUSTRIES, LTD.
    Inventors: Keigo Matsumoto, Kazuhiro Domoto, Naofumi Abe, Jun Kasai
  • Publication number: 20140011141
    Abstract: Provided is a combustion burner including: a fuel nozzle (51) that is able to blow a fuel gas obtained by mixing pulverized coal with primary air; a secondary air nozzle (52) that is able to blow secondary air from the outside of the fuel nozzle (51); a flame stabilizer (54) that is provided at a front end portion of the fuel nozzle (51) so as to be near the axis center; and a rectification member (55) that is provided between the inner wall surface of the fuel nozzle (51) and the flame stabilizer (54), wherein an appropriate flow of a fuel gas obtained by mixing solid fuel with air may be realized.
    Type: Application
    Filed: March 7, 2012
    Publication date: January 9, 2014
    Applicant: MITSUBISHI HEAVY INDUSTRIES, LTD.
    Inventors: Keigo Matsumoto, Kazuhiro Domoto, Naofumi Abe, Jun Kasai
  • Publication number: 20130233212
    Abstract: A burner for a reaction furnace (12) including a fuel tube (2), an oxidizer tube (3) covering an outer periphery of the fuel tube, and a displacement absorbing member (7) provided on at least a part of the oxidizer tube. The fuel tube and the oxidizer tube have a proximal end fixed to a side wall of the reaction furnace and penetrating an outer vessel (11). The oxidizer tube is positioned with respect to the side wall of the inner vessel to suppress a length of a distal end of each of the oxidizer tube and the fuel tube projecting to an inside of the gasification furnace (10). Thermal stretching in an axial direction of the oxidizer tube is absorbed by the displacement absorbing member attached to the oxidizer tube.
    Type: Application
    Filed: March 30, 2012
    Publication date: September 12, 2013
    Inventors: Shinya Hamasaki, Jun Kasai, Satoshi Shimonokado, Keisuke Matsuo
  • Publication number: 20120247376
    Abstract: A combustion burner 1 includes a fuel nozzle 2 that injects fuel gas prepared by mixing solid fuel and primary air, secondary air nozzles 3, 4 that inject secondary air from the outer periphery of the fuel nozzle 2, and a flame holder 5 that is arranged in an opening of the fuel nozzle 2. In the combustion burner 1, the flame holder 5 has a splitting shape that widens in the flow direction of the fuel gas. When seen in cross section along a direction in which the flame holder 5 widens, the cross section passing through the central axis of the fuel nozzle 2, a maximum distance h from the central axis of the fuel nozzle 2 to the widened end of the flame holder 5 and an inside diameter r of the opening 21 of the fuel nozzle 2 satisfy h/(r/2)<0.6.
    Type: Application
    Filed: March 11, 2010
    Publication date: October 4, 2012
    Applicant: MITSUBISHI HEAVY INDUSTRIES, LTD.
    Inventors: Keigo Matsumoto, Koutaro Fujimura, Kazuhiro Domoto, Toshimitsu Ichinose, Naofumi Abe, Jun Kasai
  • Publication number: 20120152158
    Abstract: A solid-fuel-fired burner that suppresses a high-temperature oxygen remaining region formed at the outer circumference of a flame and that can decrease the amount of NOx eventually produced is provided. A solid-fuel-fired burner that is used in a burner section of a solid-fuel-fired boiler for performing low-NOx combustion separately in the burner section and in an additional-air injection section and that injects powdered solid-fuel and air into a furnace includes a fuel burner having internal flame stabilization and a secondary-air injection port that does not perform flame stabilization, in which the air ratio in the fuel burner is set to 0.85 or more.
    Type: Application
    Filed: June 7, 2010
    Publication date: June 21, 2012
    Applicant: MITSUBISHI HEAVY INDUSTRIES, LTD.
    Inventors: Keigo Matsumoto, Koutaro Fujimura, Kazuhiro Domoto, Toshimitsu Ichinose, Naofumi Abe, Jun Kasai
  • Publication number: 20110265696
    Abstract: It is possible to prevent a phenomenon by which the wall temperature of an outer cylinder rises abruptly as a layer of steam covers the inner circumferential surface of the outer cylinder and therefore decreases the heat transfer coefficient thereof, thus preventing a heat damage to the outer cylinder. Also prevented is burnout of the burner resulting from insufficient cooling due to variations in cooling efficiency at a leading end of the burner. A leading end located in a two-stage entrained-flow bed coal gasifier has a double-walled structure including an outer cylinder and an inner cylinder, and cooling water for cooling the leading end is supplied through an interior of the inner cylinder to cool the leading end and is then returned to a base end through a space formed between the outer cylinder and the inner cylinder.
    Type: Application
    Filed: October 5, 2009
    Publication date: November 3, 2011
    Inventors: Shinya Hamasaki, Toshimi Ohtsuka, Yoshinori Koyama, Katsuhiko Yokohama, Yasunari Shibata, Jun Kasai
  • Publication number: 20050231233
    Abstract: To improve reliability of a bus interface by restraining fluctuation in characteristics of an input circuit, such as threshold voltage, temperature and power source voltage, when an input signal shifts from Hi level to Lo level, transistor MP3 is OFF until the input signal lowers to a logic threshold value; and, by comparing a reference voltage and an input signal the low level input voltage shifts to the level of the difference voltage. When the input signal shifts from Lo level to Hi level, transistor MP3 is ON until the input signal exceeds the logic threshold value, the High level input voltage is increased by the amount of current of transistor MP4. The current of transistor MP4 is proportional to the current of transistor MN1, and, therefore, the High level input voltage becomes constant, and is not influenced by the threshold voltage, the temperature of the transistor, and power source voltage.
    Type: Application
    Filed: April 15, 2005
    Publication date: October 20, 2005
    Inventors: Jun Kasai, Koji Takada, Masato Suzuki