RINNAI CORPORATION

To assemble a three-way valve without weakening the bond between a driver and a shaft with grease adhering to the shaft end, a straight flow path includes two ends and an intermediate portion respectively continuous with first to third ports, and first and second valve orifices having opening areas changed when first and second valve elements ( 34 a, 34 b ) at the bottom of the shaft ( 35 ) move. The shaft extends through a bearing ( 42 ) in a guide ( 41 ) with its top bonded inside the cylindrical driver ( 50 ). The driver includes a gear ( 51 ) at the top and an externally threaded portion ( 53 ) at the bottom. The guide includes an internally threaded portion ( 43 ) above the bearing to receive the externally threaded portion. The driver includes a cylindrical portion ( 54 ) protruding downward from the externally threaded portion with its outer diameter smaller than an inner diameter of the internally threaded portion.

The utility model provides a little bubble device, this little bubble device includes: a body has an entry, an export, one lies in the venturi tube mechanism between this entry and this export, and this venturi tube mechanism has a neck that feeds through the external world, a bubble refines the mechanism, has the passageway that an at least cross-section is lighter than the cross-section of this entry, and an at least passageway feeds through between this venturi tube mechanism and export, the body still includes a cylinder part, this venturi tube mechanism holding in this cylinder part, this cylinder part pass through be equipped with one with the air inlet hole of neck intercommunication. The utility model discloses a little bubble device can provide very careful and careful foam water stream.

A space heating system may include: a heat source device; a space heating terminal; a heating circuit including a primary outward path, a primary return path, a secondary outward path, and a secondary return path; a fluid mixer fluidly connecting the primary outward path, the primary return path, the secondary outward path, and the secondary return path to each other; a primary return temperature sensor configured to detect a temperature of a heat medium flowing in the primary return path; a secondary outward temperature sensor configured to detect a temperature of the heat medium flowing in the secondary outward path; and a controller configured to determine whether detection failure is occurring in the secondary outward temperature sensor based on the temperature detected by the primary return temperature sensor and the temperature detected by the secondary outward temperature sensor.

On the premise of a heat exchange apparatus provided with a sensible heat exchanger and a latent heat exchanger, in which the latent heat exchanger is disposed above the sensible heat exchanger via an exhaust hood member that covers an upper surface of the sensible heat exchanger, and the latent heat exchanger is provided with a plurality of heat absorbing pipes arranged in a box-shaped case, drains do not drop into the sensible heat exchanger, and the latent heat exchanger can be downsized. An inflow hole is formed on a bottom surface of the case of the latent heat exchanger and positioned below a region where the heat absorbing pipes are arranged. A covering member, which covers a connecting hole facing the inflow hole and formed in the exhaust hood member, is provided so as to protrude within the case of the latent heat exchanger.

In a hot water supply apparatus including a heat exchanger to which water heated by renewable energy or waste heat from other heat sources is supplied, a controller performs an intermittent combustion control in which combustion and combustion stoppage in a burner are repeated as a condition in which a water supply temperature exceeds a predetermined upper limit of the water supply temperature. In the intermittent combustion control, a combustion fan is caused to operate during the combustion and to at least temporarily, preferably always, operate during the combustion stoppage.

A fine bubble generating nozzle may include a nozzle unit and a baffle. The nozzle unit may include: an inlet; a pressure decreasing portion configured to decrease a pressure of a gas-dissolved pressurized water introduced from the inlet; a first collision chamber disposed downstream of the pressure decreasing portion and including a first collision wall with which the gas-dissolved pressurized water introduced from the pressure decreasing portion collides so that a flow direction of the gas-dissolved pressurized water changes; a second collision chamber disposed downstream of the first collision chamber and including a second collision wall with which the gas-dissolved pressurized water having flowed through the first collision chamber collides so that the flow direction of the gas-dissolved pressurized water changes; and an outlet. The baffle may be disposed outside of the nozzle unit and is disposed at a position facing the outlet.

Provided is an exhaust port member ( 7 ) having an inlet port ( 811 ) into which combustion exhaust gas flows; an exhaust port ( 77 ) through which the combustion exhaust gas is discharged to an outside; an exhaust passage (P) in which the combustion exhaust gas flows from the inlet port ( 811 ) toward the exhaust port ( 77 ); and a space part ( 9 ) which is located adjacent to a downstream end exhaust passage part (Pz) positioned at a downstream end of the exhaust passage (P) via a partition wall (781) defining the downstream end exhaust passage part (Pz), wherein the space part ( 9 ) has an upstream opening ( 90 ) on an upstream side thereof, the combustion exhaust gas flowing through the exhaust passage (P) flows into the space part ( 9 ) through the upstream opening ( 90 ), and the space part ( 9 ) is closed except for the upstream opening ( 90 ).

In a combustion apparatus that includes a burner constituted by a burner body, an inside of which an air-fuel mixture is supplied to and one surface of which is made into an open surface, and a combustion plate covering the open surface of the burner body, and a combustion box enclosing a combustion space of the air-fuel mixture ejecting from the combustion plate, an offset part that is positioned at a portion which is away from the swelling part in an inflow direction of the air-fuel mixture to the inner chamber and does not oppose to a tip part(s) of the ignition electrode(s) through the combustion plate is provided with the opposite wall of the burner body and the offset part offsets to a combustion-plate side so that a distance between the offset part and the combustion plate becomes shorter than that between the combustion plate and a general part of the opposite wall except the swelling part and the offset part.

A heating medium circulation apparatus promptly detects an overheating abnormality of a heating medium caused by insufficient circulation. The heating medium is pumped by a pump in a predetermined direction in a closed-loop circuit connecting a heater and a heat dissipator. An outgoing temperature and a return temperature of the heating medium flowing out of and into the heater are detected. When a heat dissipation-based operation starts, the pump is activated, and heating is started. Heating is temporarily stopped when the outgoing temperature reaches a heating stop temperature. Heating is resumed when the outgoing temperature falls below a heating resumption temperature. An additional condition that the difference between the outgoing and return temperatures is less than a determination value can be added to the condition for resuming heating. An overheating abnormality is detected when the additional condition remains unsatisfied until a determination time elapses after heating is stopped.

A heating medium circulation apparatus promptly detects an overheating abnormality, or local overheating of a heating medium caused by insufficient circulation of the heating medium in a circulation circuit. The heating medium is pumped by a circulation pump in a predetermined direction in a closed-loop circulation circuit connecting a heater that heats the heating medium and a heat dissipator that dissipates heat from the heating medium. The temperature of the heating medium flowing out of the heater is detected by an outgoing temperature sensor. Upon the start of a heat dissipation-based operation using heat dissipation with the heat dissipator, the circulation pump is activated, and the heating in the heating is started. An overheating abnormality is detected when the increasing gradient being the rate of increase per unit time of the temperature detected by the outgoing temperature sensor is higher than or equal to a predetermined determination gradient.