Abstract: A heat exchanger disposed on a downstream side of a gas flow passage of combustion exhaust gas ejected from a burner comprising a plurality of heat exchange units stacked in a gas flow passage direction of the combustion exhaust gas, an inlet pipe, and an outlet pipe, wherein the inlet pipe and the outlet pipe are provided so as to protrude from a most downstream heat exchange unit located on a most downstream side of the gas flow passage of the combustion exhaust gas toward the downstream side of the gas flow passage of the combustion exhaust gas.

Abstract: A heat exchanger (1) comprising a plurality of heat exchange units (10), wherein each of the plurality of heat exchange units (10) includes: an internal space (14) in 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 combustion exhaust gas flows, at least one inlet port (20), and at least one outlet port (21), wherein at least the one inlet port (20) and at least the one outlet port (21) in each of the heat exchange units (10) are disposed at both ends in a longitudinal direction of the heat exchange unit (10) and are disposed to be shifted in a lateral direction of the heat exchange unit (10).

Abstract: A combustion apparatus includes a burner having a sheet-metal combustion plate which covers an open surface of a burner body; and a combustion box having a connection flange part to be coupled to a body flange part enclosing the open surface of the burner body, and is equipped with a cooling means for cooling the combustion box, an arrangement is made that overheating of the burner body due to heat transmission from the combustion plate can be prevented, even without enhancing thermal insulation performance of a packing to be interposed between a combustion plate flange part and the body flange part. The connection flange part is kept in direct contact with the combustion plate flange part and, coupled to the body flange part. The packing is provided with: a combustion plate seal part to be pressed under pressure against the combustion plate flange part; and a combustion box seal.

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 flame rod (1) including: a rod portion (11) made of a metal material containing aluminum; and a protective cover layer (21) containing a cover material having high conductivity and high heat resistance, wherein the protective cover layer (21) covers a surface of an insertion portion (11A) of the flame rod (11), and the protective cover layer (11) has a thickness of 0.002 mm or more and less than 0.1 mm.

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 water heater having a casing (100) in which a burner body (1) and a fan case (2) are accommodated, wherein the burner body (1) includes a main burner body unit (12) having a flat burner (3) on a lower surface thereof, and an introducing unit (11) projected from an upper surface of the main burner body unit (12), wherein the introducing unit (11) has an inlet port (10) communicated with the fan case (2), and an fan installation surface (13) having the inlet port (10) is provided so as to face to a front direction or a diagonally front direction as viewed from a frontward direction.

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 water heater includes a vessel (20) provided with a burner (3) having a downward combustion surface, a fan casing (10) accommodating a fan (10a) for supplying a mixture gas of primary combustion air and fuel gas to the burner, an annular packing connecting a first connection end surface at a downstream end of a first passage forming a downstream-side passage of the fan casing with a second connection end surface at an upstream end of a second passage forming an upstream-side passage of the vessel in airtight state, and a check valve (5) disposed near the upstream end in the second passage (2).

Abstract: In a heat source apparatus in which an electric component having an electrode and an insulator is mounted on a side plate of a combustion box, in a state in which a packing is interposed between a flange portion of the insulator and the side plate, by fastening a clamp which overlaps with an outer surface of the flange portion, to the side plate, the temperature rise in the clamp is restrained. Upper and lower water tubes constituting a part of a water jacket are disposed on the side plate on upper and lower sides of the position of mounting the electrode component.

Abstract: In a heat source apparatus in which an electric component having an electrode and an insulator is mounted on a side plate of a combustion box, in a state in which a packing is interposed between a flange portion of the insulator and the side plate, by fastening to the side plate a clamp which overlaps with an outer surface of the flange portion, the packing is prevented from getting spread when compressed, thereby securing good sealing properties. Upper and lower water tubes constituting a part of a water jacket are disposed on a side plate on upper and lower sides of the mounting position of the electrode component.

Abstract: A rich-lean burner has on an upper end portion thereof: a lean flame port longitudinally extended to eject a lean fuel-air mixture which is leaner in fuel concentration than a theoretical fuel-air ratio; a blind clearance located on each lateral side of the lean flame port, the blind clearance being free from ejection of a fuel-air mixture; and a rich flame port located on lateral outside of each of the blind clearances to eject a rich fuel-air mixture which is richer in fuel concentration than the theoretical fuel-air ratio. The rich-lean burner further has a lean-flame deforming device to deform a lean flame formed by combustion of the lean fuel-air mixture ejected from the lean flame port such that the shape of one lateral side of the lean flame becomes asymmetrical with the shape of laterally opposite side of the lean flame.

Abstract: In a heat source apparatus in which an electric component having an electrode and an insulator is mounted on a side plate of a combustion box, in a state in which a packing is interposed between a flange portion of the insulator and the side plate, by fastening to the side plate a clamp which overlaps with an outer surface of the flange portion, the packing is prevented from getting spread when compressed, thereby securing good sealing properties. Upper and lower water tubes constituting a part of a water jacket are disposed on a side plate on upper and lower sides of the mounting position of the electrode component.

Abstract: In a heat source apparatus in which an electric component having an electrode and an insulator is mounted on a side plate of a combustion box, in a state in which a packing is interposed between a flange portion of the insulator and the side plate, by fastening a clamp which overlaps with an outer surface of the flange portion, to the side plate, the temperature rise in the clamp is restrained. Upper and lower water tubes constituting a part of a water jacket are disposed on the side plate on upper and lower sides of the position of mounting the electrode component.

Abstract: A rich-lean burner has on an upper end portion thereof: a lean flame port longitudinally extended to eject a lean fuel-air mixture which is leaner in fuel concentration than a theoretical fuel-air ratio; a blind clearance located on each lateral side of the lean flame port, the blind clearance being free from ejection of a fuel-air mixture; and a rich flame port located on lateral outside of each of the blind clearances to eject a rich fuel-air mixture which is richer in fuel concentration than the theoretical fuel-air ratio. The rich-lean burner further has a lean-flame deforming device to deform a lean flame formed by combustion of the lean fuel-air mixture ejected from the lean flame port such that the shape of one lateral side of the lean flame becomes asymmetrical with the shape of laterally opposite side of the lean flame.

Abstract: Provided is a combustion apparatus capable of preventing a heat loss from a combustion cabinet without deteriorating a combustion performance thereof. According to the present invention, a part of an inner side surface of a combustion cabinet (1), which encloses a combustion chamber where a mixture gas erupted from a combustion plate (22) is combusted, is covered with a cover (7) made of an insulation material; and the cover (7) is provided with a concave portion (7a) at an outer side surface thereof having contact with the inner side surface of the combustion cabinet (1), and an insulation air layer (7b) is defined by the concave portion (7a).

Abstract: A combustion apparatus with an air supply chamber in a lower part partitioned by a partition plate from an arrangement section of a burner unit and a primary air chamber in a front part stands from a front end of the air supply chamber are provided in a combustion housing incorporating the burner unit. Air from a combustion fan connected to an air supply port of the air supply chamber flows to the primary air chamber through the air supply chamber. Primary air is supplied from the primary air chamber to burners of the burner unit. Projected rims extend from the periphery of a portion of the partition plate opposed to the air supply port to a front edge of the partition plate are provided on a lower surface of the partition plate. The height of a downward projection of the projected rims is reduced toward the air supply port.

Abstract: In an all primary combustion burner, a partition plate that demarcates a mixing chamber between the partition plate and a bottom wall section of a burner main body and a distributing plate that sections a space between the partition plate and the combustion plate into a first distributing chamber and a second distributing chamber are provided in the burner main body to cause a fuel gas and a primary air to flow into the mixing chamber A pressure loss is minimized to make it possible to satisfactorily mix the fuel gas and the primary air. An outlet is formed on a downstream side of the partition plate. A guide plate section that extends to the downstream side while inclining in a normal direction, which approaches the bottom wall section of the burner main body, from an edge on the upstream side of the outlet, is provided in the partition plate.