Patents Assigned to Rinnai Corporation
  • Patent number: 11365940
    Abstract: The plate-type heat exchanger includes blocks stacked on each other, each of the blocks including a heat exchanger body configured to exchange heat between a first fluid and a second fluid. A connection passage for the first fluid is formed between blocks adjacent to each other of the plurality of blocks, the connection passage allowing the outlet of one of the blocks adjacent to each other and the inlet of the other of the blocks adjacent to each other to communicate with each other, the first fluid in the blocks adjacent to each other having different flow directions between the blocks adjacent to each other, and a second connection passage is provided between at least one pair of blocks adjacent to each other among the plurality of blocks, the second connection passage being configured to cause the first fluid to flow to a position different from the connection passage.
    Type: Grant
    Filed: November 5, 2019
    Date of Patent: June 21, 2022
    Assignee: Rinnai Corporation
    Inventors: Takashi Ojiro, Takahiro Ono
  • Patent number: 11333397
    Abstract: A heat transfer fin (1) includes a plurality of heat-transfer-tube insertion holes (10) aligned in a single stage, a downstream cut portion (3) formed so as to be recessed toward an upstream side of a gas flow passage of combustion exhaust gas, a downstream flange (13) formed on a peripheral edge of the downstream cut portion (3) so as to protrude from one surface of the heat transfer fin (1), and a plurality of first protruding pieces (4a) (4b) (4c) formed between the heat-transfer-tube insertion hole (10) and the downstream flange (13) so as to protrude alternately from both surfaces of the heat transfer fin (1).
    Type: Grant
    Filed: September 11, 2019
    Date of Patent: May 17, 2022
    Assignee: RINNAI CORPORATION
    Inventor: Ai Kimura
  • Patent number: 11320154
    Abstract: The present invention improves the user-friendliness of a hot-water supply apparatus when using hot water supply and air conditioning. A switching control unit 27, which switches between heat medium flow paths 4 and 5 according to an air conditioning ready state or a hot-water supply ready state, switches a heat medium flow path to the hot-water supply ready state by a switching valve 21 in the case where air conditioning is not used by the time an air conditioning standby time elapses during standby in the air conditioning ready state.
    Type: Grant
    Filed: October 30, 2019
    Date of Patent: May 3, 2022
    Assignee: RINNAI CORPORATION
    Inventors: Atsushi Fukaya, Shigeki Takeuchi
  • Patent number: 11313589
    Abstract: The water heater may be configured to execute a normal operation in which a heating means is continuously operated in an ON state in a case where a required heat quantity is greater than or equal to a minimum heat quantity. The water heater may be configured to execute an intermittent operation in which the heating means is alternately and repeatedly operated in the ON state and an OFF state repeatedly in a case where the required heat quantity is less than the minimum heat quantity. The water heater may be configured to change a distribution ratio of a flow control mechanism in the normal operation and in the intermittent operation. An operating speed of the flow control mechanism in the intermittent operation may be faster than an operating speed of the flow control mechanism in the normal operation.
    Type: Grant
    Filed: August 19, 2020
    Date of Patent: April 26, 2022
    Assignee: RINNAI CORPORATION
    Inventor: Rikiya Yuge
  • Patent number: 11306981
    Abstract: A heat exchanger (1) includes a heat exchanging body (20) disposed within an outer box (10). A supply pipe (21) and a discharge pipe (22) in fluid communication with the heat exchanging body (20) respectively extend through first and second insertion holes (31, 32) in the outer box (10). Elastic seal members (40; 240) are respectively provided around the supply pipe (21) and the discharge pipe (22) and between a first sidewall (11) of the outer box (10) and the heat exchanging body (20). At least one biasing member (50; 250) exerts a lateral biasing force (F1; F2) on the elastic seal members (40; 240), thereby maintaining the elastic seal members (40; 240) in a state of compressive deformation and contacting the outer box (10) and the heat exchanging body (20) in an air-tight manner to block potential leakage paths (LP1; LP2) via the insertion holes (31, 32).
    Type: Grant
    Filed: August 27, 2019
    Date of Patent: April 19, 2022
    Assignee: RINNAI CORPORATION
    Inventors: Yoshio Goto, Daisuke Naito, Shigeki Takeuchi
  • Publication number: 20220074591
    Abstract: A controller memorizes an accumulated combustion time by accumulating combustion time of a burner, and is set in a first lower-limit and a second lower-limit higher than the first lower-limit as a lower-limit lower than an initial value of an excess air ratio when reducing an excess air limit of a mixture gas of combustion air and a fuel gas, and the former is the lower-limit in case the accumulated combustion time is under a predetermined set time and the latter is the one in case the accumulated combustion time is the predetermined set time and over.
    Type: Application
    Filed: August 6, 2021
    Publication date: March 10, 2022
    Applicant: RINNAI CORPORATION
    Inventor: Masaru Takeuchi
  • Publication number: 20220042618
    Abstract: An electrically operated gas flow regulating valve in which a needle valve body (2) is moved axially through a motion conversion mechanism (4) by the rotation of an electric motor (3). The motion conversion mechanism (4) includes: a guide tube (5) in which is formed axially elongated slits (51) with which cam pins (21) fixed to the needle valve (2) are slidably engaged; and a tubular cam body (6) having a spiral cam part with which the cam pins (21) are engages through elongated slits (51). In an arrangement in which one of the guide tube (5) and the cam body (6), e.g., the guide tube (5), is rotated by the electric motor (3), hysteresis is restrained from occurring. The cam part disposed in the cam body (6) is constituted by a spirally inclined sides (61) with which the cam pins (21) are brought into contact from axial one direction. A spring member (7) is disposed so as to urge the cam pins (21) in the other of the axial directions toward the spirally inclined sides (61).
    Type: Application
    Filed: June 28, 2021
    Publication date: February 10, 2022
    Applicant: RINNAI CORPORATION
    Inventor: Kotaro Kuzuya
  • Patent number: 11231181
    Abstract: A heating and hot-water supply apparatus shortens the time taken for hot-water supply to stabilize at a set temperature in response to a request for a hot-water supply operation during a heating operation. The apparatus performs, using a common heating medium heated by a heater, a heating operation by circulating the heating medium through a heating terminal, and a hot-water supply operation of heating service water through heat exchange with the heating medium circulated through a hot-water supply heat exchanger and supplying hot water. A distribution unit (three-way valve) changes a distribution ratio of the heating medium between the heating terminal and the hot-water supply heat exchanger. A controller controls an amount of heat generated by the heater for the heating operation or the hot-water supply operation, and stops heating with the heater when the temperature of the heating medium reaches a predetermined upper-limit temperature.
    Type: Grant
    Filed: December 30, 2019
    Date of Patent: January 25, 2022
    Assignee: Rinnai Corporation
    Inventors: Yuya Miyazaki, Atsushi Fukaya
  • Patent number: 11181265
    Abstract: [Problems] A flat burner elongated in the longitudinal direction has, at an upper end thereof, a main burner port (63) and a flame retention port (64) positioned at least on laterally one side of the main burner port (63). The flat burner uses hydrogen-containing fuel as a fuel. Flash back is prevented at the flame retention port in which the gas ejection speed becomes relatively small. [Solving Means] A lean fuel-air mixture which is leaner in fuel concentration than a theoretical fuel-air ratio is ejected from the main burner port (63) and a gas containing only fuel is ejected from the flame retention port (64). In addition, the height, on the side of the main burner port (63), of the upper end of the flame retention port (64), is made lower than the height of the upper end of the main burner port (63).
    Type: Grant
    Filed: November 7, 2019
    Date of Patent: November 23, 2021
    Assignee: RINNAI CORPORATION
    Inventor: Takahiro Ono
  • Publication number: 20210356123
    Abstract: The air-fuel mixture permeable member is disposed to overlap that surface of the burner frame which lies opposite to the burner body. The fixing frame is disposed so as to be fixed to the inner peripheral portion of the enclosing frame part of the burner frame by pinching the air-fuel mixture permeable member between the inner peripheral portion and the fixing frame. The air-fuel mixture permeable member has an extended part protruding outward beyond the fixing frame so as to cover by this extended part an outer peripheral portion of the enclosing frame part.
    Type: Application
    Filed: April 19, 2021
    Publication date: November 18, 2021
    Applicant: RINNAI CORPORATION
    Inventor: Kazuyuki Akagi
  • Publication number: 20210348756
    Abstract: An outer peripheral edge part of the air-fuel mixture permeable member is connected to a portion away outward by a predetermined distance from an inner peripheral edge of the burner frame. Between the burner frame and the air-fuel mixture permeable member a clearance reaching the inner peripheral edge of the burner frame is secured at a position inward of the outer peripheral part of the air-fuel mixture permeable member. Preferably, a bent edge part formed on an inner peripheral edge of the burner frame, in a manner to be bent toward the air-fuel mixture permeable member. The amount of the air-fuel mixture to flow into the clearance is limited to a smaller amount.
    Type: Application
    Filed: April 19, 2021
    Publication date: November 11, 2021
    Applicant: RINNAI CORPORATION
    Inventor: Kazuyuki Akagi
  • Patent number: 11168895
    Abstract: A heating and hot-water supply apparatus performs a heating operation by heating a heating medium with a heater and circulating the heating medium through a heating terminal, a hot-water supply operation by circulating the common heating medium through a hot-water supply heat exchanger, heating service water through heat exchange with the heating medium, and supplying hot water, and a simultaneous operation of the heating operation and the hot-water supply operation, and controls a distribution ratio of the heating medium between the heating terminal and the hot-water supply heat exchanger. The apparatus determines whether the heating terminal proceeding in the heating operation is a suspendible terminal to suspend the heating operation or an unsuspendible terminal not to suspend the heating operation in response to a request for the hot-water supply operation.
    Type: Grant
    Filed: December 30, 2019
    Date of Patent: November 9, 2021
    Assignee: Rinnai Corporation
    Inventors: Yuya Miyazaki, Shigeki Shimada, Yoshio Goto
  • Patent number: 11131512
    Abstract: The exhaust duct includes an exhaust collecting portion connected a heat exchanger and an exhaust guiding portion communicating with the exhaust collecting portion and extended upward in a state close to a side of a cylindrical body of the heat exchanger. The exhaust collecting portion includes a connection opening constituting an inner peripheral wall, into which a cylindrical outlet side connection portion at the lower end of the heat exchanger is fitted, and a groove provided on an outer peripheral side than the inner peripheral wall of the connection opening. The packing includes a seal portion sandwiched in a compressed state between the inner peripheral wall of the connection opening in the exhaust collecting portion and an outer peripheral wall of the cylindrical outlet side connection portion in the heat exchanger to constitute a seal and an anchor portion inserted into the groove of the exhaust collecting portion.
    Type: Grant
    Filed: June 27, 2019
    Date of Patent: September 28, 2021
    Assignee: Rinnai Corporation
    Inventors: Yoshio Goto, Daisuke Naito, Shigeki Takeuchi
  • Patent number: 11118842
    Abstract: The heat exchanger (1) has a plurality of heat exchange units (10) stacked in a direction of a gas flow passage of combustion exhaust gas, each of the heat exchange units (10) includes an internal space (14) through which a fluid to be heated flows, a plurality of gas vents (13) penetrating the internal space (14) in a non-communicating state and through which the combustion exhaust gas passes, and an inwardly directed step portion (17) reducing a height of the internal space (14) between adjacent gas vents (13).
    Type: Grant
    Filed: July 5, 2019
    Date of Patent: September 14, 2021
    Assignee: RINNAI CORPORATION
    Inventor: Takashi Ojiro
  • Patent number: 11118811
    Abstract: A heat source device comprising: a combustion chamber (2) provided between a burner (31) and a heat exchanger (1); an inlet pipe (20) for allowing a fluid to be heated to flow in the heat exchanger (1); an outlet pipe (21) for allowing the fluid to be heated to flow out from the heat exchanger (1); and a winding pipe (27) wound around an outer surface of a peripheral wall of the combustion chamber (2), wherein either the inlet pipe (20) or the outlet pipe (21) has an orifice (91) for throttling a fluid flow path of the fluid to be heated flowing in the inlet pipe (20) or the outlet pipe (21).
    Type: Grant
    Filed: December 10, 2019
    Date of Patent: September 14, 2021
    Assignee: RINNAI CORPORATION
    Inventors: Takahiro Ono, Takashi Ojiro
  • Patent number: 11111929
    Abstract: A rotational shaft is placed through insertion holes of rubber washers sandwiching a portion of an impeller having a mount hole. The impeller is mounted on the rotational shaft with a nut on a threaded distal end portion of the rotational shaft. The rotational shaft of the motor includes a locking surface. The insertion holes of the rubber washers each have the same shape as the cross-sectional shape of the rotational shaft. The mount hole of the impeller includes a spacing portion extending at an angle from the linear portion of the insertion hole of each rubber washer away from the locking surface of the rotational shaft. Although the impeller rotates with respect to the rotational shaft under a frictional force applied from the nut tightened against the rotational shaft, this structure prevents metallic contact between the impeller at the mount hole and the locking surface of the rotational shaft.
    Type: Grant
    Filed: August 7, 2019
    Date of Patent: September 7, 2021
    Assignee: Rinnai Corporation
    Inventor: Hirotoshi Taki
  • Patent number: 11105505
    Abstract: A method of controlling a premixing apparatus that mixes fuel gas with air and supplies thus obtained air-fuel mixture, through a fan to a burner, includes at a time of changing over to a small-capacity state in which a first ventilation resistance in an air supply passage is increased and also in which a second ventilation resistance in a gas supply passage is increased, rotating a butterfly valve down to a closing side stop angle; and at a time of changing over to a large-capacity state in which the first ventilation resistance in the air supply passage is decreased and also in which the second ventilation resistance in the gas supply passage is decreased, rotating the butterfly valve up to an open-side stop angle.
    Type: Grant
    Filed: June 14, 2019
    Date of Patent: August 31, 2021
    Assignee: RINNAI CORPORATION
    Inventor: Masao Nonoyama
  • Patent number: 11079138
    Abstract: A combustion apparatus (1) has a burner (11) configured to burn combustion gas, a heat exchanger (12) disposed below the burner (11), and a combustion fan (13) configured to supply air for combustion, wherein the combustion apparatus performs post-purge operation in which the combustion fan (13) is activated for a predetermined period of time after combustion operation of the burner (11) stops, and intermittent blower operation in which activation and deactivation of the combustion fan (13) is repeated a plurality of times at predetermined intervals after the post-purge operation ends.
    Type: Grant
    Filed: July 8, 2016
    Date of Patent: August 3, 2021
    Assignee: Rinnai Corporation
    Inventor: Yosuke Suzuki
  • Patent number: 11041657
    Abstract: A hot-water supply apparatus capable of restraining the occurrence of noises from a building wall surface side includes a hot-water supply apparatus main body having a burner and a heat exchanger that generates hot water by combustion exhaust of the burner, and a rectangular parallelepiped main body case that houses the hot-water supply apparatus main body. A back plate (5c), which closes the back side of the main body case, is installed to a building wall surface (W) such that the back plate (5c) opposes the building wall surface (W) with a predetermined void space (S) provided therebetween. A soundproof member (18), which closes at least a part of an open end of the void space (S), is provided on the main body case (5).
    Type: Grant
    Filed: August 6, 2018
    Date of Patent: June 22, 2021
    Assignee: RINNAI CORPORATION
    Inventors: Kentaro Mori, Hideyuki Jinno
  • Patent number: D941972
    Type: Grant
    Filed: August 27, 2020
    Date of Patent: January 25, 2022
    Assignee: RINNAI CORPORATION
    Inventors: Hiroaki Higashijima, Yoshikazu Kubo, Tomoe Usami, Eri Horii