Abstract: A burner has: a combustion plate part for ejecting air-fuel mixture; and a flame rod which lies opposite to a portion of the combustion plate part which has a picture-frame-like burner frame; a metal-fiber knit which covers an opening enclosed by the burner frame; and a distribution plate which has formed therein distribution holes and which sandwiches the metal-fiber knit between the burner frame and the distribution plate through the distribution holes and the metal-fiber knit. The flame rod has: a rod base part which lies opposite to a portion of opening peripheral part of the burner frame which is positioned on the same surface level as the opening; and a rod main body part which lies opposite to a portion of the metal-fiber knit. The distance between the rod base part and the opening peripheral part is made smaller than the distance between the rod main body part and the metal-fiber knit.

Abstract: A burner has: a combustion plate part through which air-fuel mixture is ejected; and a flame rod which lies opposite to a portion of the combustion plate part. The combustion plate part is constituted by: a burner frame in a shape of a picture frame; a metal-fiber knit which covers an opening enclosed by the burner frame; and a distribution plate which has formed therein a multiplicity of distribution holes and which sandwiches the metal-fiber knit between the burner frame and the distribution plate so that the air-fuel mixture is ejected from the opening through the distribution holes and the metal-fiber knit. Flame holes for ejecting the air-fuel mixture are formed in a portion of the burner frame, and the flame rod is disposed so as to lie opposite to that portion of the burner frame which has formed therein the flame holes.

Abstract: A totally aerated combustion burner has: a burner body which is supplied therein with air-fuel mixture; and a combustion plate part which covers an open surface of the burner body. The combustion plate part is constituted by: a burner frame in a shape of a picture frame; a metal-fiber knit which is disposed to cover, from a burner-body side, an opening enclosed by the burner frame; and a distribution plate which has formed therein a multiplicity of distribution holes and which sandwiches the metal-fiber knit between the burner frame and the distribution plate. Only the metal-fiber knit is spot-welded to that opening peripheral part of the burner frame which is positioned on a same surface as the opening. The distribution plate is spot-welded to that portion of the burner frame which is offset from the opening peripheral part toward the burner-body side.

Abstract: A combustion apparatus has a plurality of longitudinally elongated gas burners, each having a burner port on an upper end thereof. A damper is disposed to cover gas inlet ports on an upstream end of an air-fuel mixing tube portion of each of the gas burners. The damper has formed therein ventilation holes for limiting primary air. The ventilation holes overlap, and are smaller than, the gas inlet ports. The damper has #1 ventilation holes having obstacles against which the fuel gas to be ejected from the gas nozzles strike, and #2 ventilation holes without obstacles. Poor combustion such as flame lifting is restricted and combustion noises are reduced.

Abstract: Provided is a heat source device including a control unit which, in response to a predetermined request for heating, sets a switching valve to a first circulation mode to communicate first and third ports, whereas to cut off communication between second and third ports, and performs a heating operation by actuating a burner and a circulation pump. In response to a predetermined request for hot water supply, the control unit sets the switching valve to a second circulation mode to communicate second and third ports, whereas to cut off communication between first and third ports, and performs a hot water supply operation, by actuating the burner and the circulation pump. A hot water supply stop alarm unit issues a hot water supply stop alarm that urges a user to stop using hot water when the request for heating is continued for a first predetermined time or more.

Abstract: In a combustion apparatus including: a burner made up of a burner body and a sheet-metal combustion plate; and a combustion box which has a connection flange part to be coupled to a body flange part in a circumference of the burner body, the combustion box has disposed therein water passages as a cooling means, and a thermal insulation material which overlaps that portion of the combustion plate flange part which faces an inner space of the combustion box. A fixing plate for the thermal insulation material is attached to the combustion plate flange part. The fixing plate is provided with pressing claws for pressing in position the thermal insulation material so as to press and prevent the thermal insulation material from getting released away from the fixing plate. And water passages are disposed in a manner to contact the pressing claws.

Abstract: A fixing plate for the thermal insulation material is attached to the combustion plate flange part. Provided that a direction leaving away from the air-fuel mixture ejection part of the combustion plate is defined as an outward side direction, there are disposed: on the side edge in the outward side direction of the fixing plate, bent edge parts, which come into contact with the side edge in the outward side direction of the thermal insulation materials; and a plurality of tongue-shaped pressing claws which are elongated from the bent edge part so as to press and prevent the thermal insulation materials from getting released away from the fixing plate.

Abstract: A water heater including a burner body (1) and a fan case (2) accommodated in casing (100), wherein the burner body (1) has a main burner body unit having a flat burner (3) on a lower surface side thereof and an introducing unit (11) protruding upward from the upper surface of the main burner body unit (12), wherein a discharging portion (53) of the ignition electrode (50) is disposed within a projection plane (180) when wall sections (13) (14) (15) (16) of the introducing unit (11) is projected downwardly.

Abstract: A combustion apparatus includes a burner (11), a heat exchanger (12) accommodated in a casing (20), an exhaust passage (22B) provided to one side surface side of the casing (20), and an exhaust resistance member (5) having a plurality of ventilation ports (50) through which combustion exhaust gas passes, wherein at least one part of the ventilation ports (50) has an elongated hole shape extending in the flow direction of the combustion exhaust gas from beneath the casing (20) to the exhaust passage (22B).

Abstract: An orifice 26 is provided in an air supply passage 5a of a warm air heater 100, and a differential pressure sensor 28 detects differential pressure ?p between front and rear of the orifice 26 in the air supply passage 5a. Rotation speed of the combustion fan 24 is corrected on the basis of the differential pressure ?p detected by the differential pressure sensor 28.

Abstract: A fin-tube type of heat exchanger has: a plurality of fins laminated to one another; a housing for containing therein the fins; and a heat transfer tube penetrating the fins in a fin-laminating direction and also penetrating side plates on both sides of the housing. A heat transfer tube through hole is formed in one-side side plate of the housing by a burred hole having a tubular flange part protruded into the housing. Each fin has a brazing material insertion hole adjacent to the heat transfer tube through hole. That portion of a brazing material which protrudes from the brazing material insertion hole of the outermost fin closest to the one-side side plate part toward the one-side side plate part gets molten. The tubular flange part has a cutout part formed, at a circumferential position facing the brazing material insertion hole, by partly cutting away the tubular flange part.

Abstract: To provide a connected hot-water supply system capable of preventing combustion failure of the burner of each hot-water supplier during hot-water supply operation to achieve stable hot-water supply operation. When dispersion in the rotation speed of a fan 15 among respective hot-water suppliers 1 is detected, a connection control unit 2 regulates the combustion amount of each of the hot-water suppliers 1 so as to reduce a difference in the rotation speed of the fan 15 among the respective hot-water suppliers 1.

Abstract: Provided is a heat medium circulation device with a simple structure, capable of reducing power consumption in performing an anti-freezing treatment. A first heat medium circuit 2 and a second heat medium circuit 3 are connected via a connector 5. An anti-freezing control unit 42 activates the first pump 22 with the second pump 32 in a stopped state, when preventing the heat medium in the first heat medium circuit 2 from freezing.

Abstract: A totally primary air combustion type of burner has a combustion plate with a plurality of slit-shaped flame holes for ejecting therethrough air-fuel mixture for combustion. The combustion plate has a plurality of flame-hole rows having flame holes arranged in an X-axis (longitudinal) direction at a predetermined pitch in a Y-axis (lateral or shorter) direction. First flame-hole rows with position of flame holes and second flame-hole rows with position of flame holes with deviation by half a pitch in the Y-axis direction, are alternately arrayed in parallel with one another in the X-axis direction. A plurality of positions in the Y-axis direction of one of the first and the second flame-hole rows are provided with thinned portions (portions where no flame holes are formed) so that the pitch between the flame holes becomes two times the predetermined pitch.

Abstract: A forced air supply combustion apparatus sucks combustion air from an air supply port. An air filter for collecting foreign matters in the air is mounted on an air-supply-port-formed plate in an insertable and drawable manner. A filter frame is arranged to be brought into close contact with a peripheral part of the air supply port in a state of having mounted the air filter in position. The air-supply-port side edge parts are provided with retaining pieces to clamp a filter side frame part in the Z-axis direction against the side edge parts. A distance in the Z-axis direction between the air-supply-port side edge parts, and the retaining pieces is set larger than a dimension, in the Z-axis direction, of the filter side frame part, and is set smaller than a sum of the dimensions to be obtained by adding to said dimensions the projection height of the projections provided in a projecting manner.

Abstract: A premixing apparatus has: a fan; an air tube; and a gas tube inside the air tube; provided that a direction toward an air flow upstream side inside the air tube is defined as an X+ direction, an air adjusting valve facing an air inlet port positioned at an end, in the X+ direction, of the air tube; a gas adjusting valve facing a gas outlet port positioned at one end of the gas tube; and a common actuator driving the air adjusting valve and the gas adjusting valve. At an end, in the X? direction, of the gas tube, is disposed a valve seat having formed therein the gas outlet port, and a gas adjusting valve inside the gas tube. A valve stem penetrates through an end wall, in the X+ direction, of the gas tube. The gas adjusting valve is driven by the actuator through the valve stem.

Abstract: A forced flue heater draws out combustion gas using a burner fan installed downstream from a heat exchanger to prevent a burner fan motor from being heated to high temperature. The forced flue heater blows air to an air channel using a blower fan, and warms the air using the heat exchanger contained in the air channel. The pressure upstream from the heat exchanger is higher by a value corresponding to the resistance of the heat exchanger. The blower fan contained in an outer case draws in the surrounding air to lower the pressure inside the outer case. A partition separating between the inside and the outside of the air channel has an air outlet located upstream from the heat exchanger. This allows the cool air upstream from the heat exchanger to flow outside the partition. The air is then used as cooling air for cooling the burner fan motor. This structure prevents the burner fan motor from being heated to high temperature when the burner fan is heated to high temperature.

Abstract: A combustion apparatus having: an upstream-side air supply chamber and a downstream-side mixing passage, both being respectively interposed between a fan and a burner; and a zero governor which is interposed in a gas supply passage and which adjusts a secondary gas pressure to a pressure equivalent to an internal pressure in the air supply chamber, thereby enabling to maximize a turndown ratio to the extent possible. The combustion apparatus has: first and second, totally two, mixing passages; a first gas outlet which is in communication with a narrowed part of the first mixing passage; a second gas outlet which is in communication with a narrowed part of the second mixing passage; a first air valve which varies an opening degree of an air inlet of the first mixing passage; a second air valve which varies an opening degree of an air inlet of the second mixing passage; and a gas valve.

Abstract: An exhaust duct has a riser duct section which is connected to an exhaust port having such an inlet port at a lower portion of the riser duct section as is connected to an exhaust port for the combustion gas, the exhaust port being opened at a lower portion of the combustion box. The riser duct section extends upward along an external surface of the combustion box. Suppose that a direction normal to the external surface of the combustion box is defined as a front-to-back direction, and a horizontal direction perpendicular to the front-to-back direction is defined as a lateral direction, then the riser duct section is formed into a flat shape having a smaller dimension in the front-to-back direction than the dimension in the lateral direction. Fluctuations in width between front-side and back-side plate parts of the riser duct section are devised to be restrained, and increase in size can be avoided.