JP2022108312A - Combustion device - Google Patents

Abstract

To inhibit positional deviation of a gas manifold 3 caused by impact force, in a combustion device having a plurality of burners arranged in parallel in a combustion casing 1, which includes the gas manifold 3 having a nozzle for injecting fuel gas from the front side toward an inflow port 22 of a mixture pipe of each of the burners.SOLUTION: A receiving seat 121 bent in a lateral direction and abutted on a rear surface of a lateral end of a gas manifold 3 is provided on a front end of a lateral side plate 12 of a combustion casing 1. A reinforcement bent flange 121c is formed on at least one of an upper end and a lower end of the receiving seat 121 over a bent corner 121b with respect to the side plate 12 of a base end of the receiving seat 121. Preferably, an engagement hole 34 into which a portion 121c' protruding forward from the receiving seat 121 of the bent flange 121c is inserted is formed on the lateral end of the gas manifold 3.SELECTED DRAWING: Figure 4

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a combustion apparatus including a combustion housing and a plurality of burners arranged side by side within the combustion housing.

Conventionally, in this type of combustion apparatus, the burners are arranged side by side, and the opening direction of the inlet of the mixing tube of each burner is the front. is provided with a gas manifold in which a plurality of nozzles for injecting are protruded corresponding to a plurality of burners.

Here, conventionally, at the front end of the lateral side plate of the combustion housing, a receiving seat is provided that is bent in the lateral direction and contacts the rear surface of the lateral end of the gas manifold. The ends are fastened (see Patent Literature 1, for example). In this case, the receiving seat is simply bent at the front end of the side plate, and does not have a structure to reinforce the receiving seat.

JP 2019-78445 A

Since the conventional example does not have a structure that reinforces the receiving seat as described above, if an impact force is applied to the gas manifold due to, for example, being dropped during transportation of the combustion device, the receiving seat will deform and the gas will be discharged. The position of the manifold will be displaced.

SUMMARY OF THE INVENTION It is therefore an object of the present invention to provide a combustion apparatus capable of suppressing displacement of a gas manifold due to an impact force.

In order to solve the above-mentioned problems, the present invention provides a combustion apparatus comprising a combustion housing and a plurality of burners arranged side by side in the combustion housing. With the opening direction of the inflow port as the front, a gas manifold in which a plurality of nozzles for injecting fuel gas from the front toward the inflow port of the mixing tube portion of each burner protrude corresponding to a plurality of burners, A receiving seat is provided on the front end of the lateral side plate of the combustion housing and is bent in the lateral direction to abut against the rear surface of the lateral end of the gas manifold. A bending flange portion for reinforcement is formed over a bending corner portion with respect to the side plate at the proximal end of the.

According to the present invention, the rigidity of the receiving seat is increased by forming the bending flange portion for reinforcement on the receiving seat. Therefore, even if an impact force is applied to the gas manifold, the receiving seat is not easily deformed, and displacement of the gas manifold due to deformation of the receiving seat can be suppressed.

Further, in the present invention, it is desirable to form an engagement hole into which a portion of the bent flange portion protruding forward from the receiving seat is inserted in the lateral end portion of the gas manifold. According to this, the load of the gas manifold can be received by the portion of the bent flange inserted into the engagement hole in a state in which the lateral end of the gas manifold is in contact with the receiving seat. Therefore, the assembling workability of the gas manifold can be improved.

1 is a perspective view of a combustion device according to an embodiment of the invention; FIG. FIG. 2 is a cut side view taken along line II-II of FIG. 1; Sectional drawing cut|disconnected by the III-III line of FIG. 1 is an exploded perspective view of a main part of a combustion apparatus according to an embodiment; FIG. FIG. 2 is an enlarged front view of the essential parts of the combustion apparatus of the embodiment; FIG. 6 is a cut side view cut along the line VI-VI of FIG. 5; FIG. 6 is a cut plan view taken along line VII-VII of FIG. 5;

1 to 3, the combustion apparatus of the embodiment of the present invention includes a combustion housing 1, a plurality of (six in this embodiment) burners 2 arranged side by side in the lower part of the combustion housing 1, and these burners. It is equipped with a gas manifold 3 that supplies fuel gas to the burner 2 and a heat exchanger 4 that is heated by the combustion gas from the burner 2 and arranged in the upper part of the combustion housing 1 . The heat exchanger 4 is connected to an upstream water supply pipe 41 and a downstream hot water discharge pipe 42 . A valve unit 5 for controlling the supply of fuel gas is connected to the gas manifold 3 .

Each burner 2 is a flat burner having a flame port elongated in the front-rear direction, which is the horizontal direction orthogonal to the horizontal direction, at the upper end. A mixing tube portion 21 is provided at the lower portion of each burner 2 . The front end of the mixing tube portion 21 is provided with an inlet 22 that opens forward. A plurality of nozzles 31 for injecting fuel gas from the front toward the inlet 22 of the mixing pipe portion 21 of each burner 2 are projected from the gas manifold 3 corresponding to the plurality of burners 2 . The fuel gas jetted from each nozzle 31 flows into the inlet 22 of each burner 2, and the primary air flows into the inlet 22, and a mixture of the fuel gas and the primary air is generated in the mixing tube portion 21. This air-fuel mixture blows out from the flame port of the burner 2 and burns, and the heat exchanger 4 is heated by the combustion gas generated by this combustion.

The combustion housing 1 is composed of a front side plate 11 covering the front portion of the combustion housing 1 positioned above the gas manifold 3, side plates 12, 12 on both lateral sides, a rear side plate 13, and a bottom plate 14. ing. Heat shield plates 15, 16 and 17 are provided so as to face the inner surfaces of the front, lateral and rear side plates 11, 12 and 13, respectively.

Referring also to FIG. 4 , the front portion of the bottom plate 14 includes an upright plate portion 141 that rises upward at the rear position of the gas manifold 3 and an upright plate portion 141 that bends forward from the upper end of the upright plate portion 141 to reach the front side plate 11 . An upper plate portion 142 is formed. The upright plate portion 141 is provided with an opening 143 facing the inlet 22 of the mixing tube portion 21 of each burner 2 . In addition, on the front surface of the standing plate portion 141, there are a plurality of openings 61 facing the inlets 22 of the mixing tube portions 21 of the burners 2 and through which the fuel gas and the primary air pass, corresponding to the plurality of burners 2. A plate 6 is arranged.

The ventilation adjusting plate 6 is screwed 62 to the upright plate portion 141 at the upper end portion of the laterally central portion thereof. Further, the bottom plate 14 is formed with a plurality of upward recesses 144 sandwiching the lower edge of each burner 2 from both lateral sides. Further, on the front side plate 11, an electrode part 7 having an ignition electrode 71 for igniting the burner 2 and a flame rod 72 for detecting the flame of the burner 2 is mounted.

A fan 9 is connected to the upper end of the combustion housing 1 via an exhaust hood 8 . A fan motor 91 is attached to the fan 9 . The combustion gas that has passed through the heat exchanger 4 is sucked into the fan 9 and discharged to the outside through an exhaust pipe (not shown) connected to an outlet 92 of the fan 9 . Further, as shown in FIG. 4, the bottom plate 14 of the combustion housing 1 has a large number of small holes 145 formed therein. Combustion air is supplied to each burner 2 by the suction force of the fan 9 . That is, the air sucked from the inlet 22 through the openings 61 of the ventilation adjusting plate 6 and the openings 143 of the upright plate portion 141 is supplied to each burner 2 as primary air for combustion. Air sucked from the holes 145 is supplied to each burner 2 as secondary air for combustion.

5 to 7, at the front end of the lateral side plate 12 of the combustion housing 1, a receiving seat 121 is bent laterally inward and abuts against the rear surface of the lateral end of the gas manifold 3. is provided. A mounting seat 64 is provided at the front end of the forward bent portion 63 formed at the lateral end of the ventilation control plate 6 so as to bend laterally outward and overlap the rear surface of the receiving seat 121 . is formed with a female thread 64a. The male screw 33 is inserted into the mounting hole 32 formed in the lateral end of the gas manifold 3 and screwed into the female screw 64a through the hole 121a formed in the receiving seat 121. It is fastened together with the mounting seat 64 .

By the way, if an impact force is applied to the gas manifold 3 by dropping the combustion apparatus during transportation, the receiving seat 121 may be deformed and the position of the gas manifold 3 may be displaced. Therefore, in the present embodiment, a bending flange portion 121c for reinforcement is formed at the lower end of the receiving seat 121 over the bending corner portion 121b of the base end of the receiving seat 121 with respect to the side plate 12 .

According to this, the rigidity of the receiving seat 121 is increased. Therefore, even if an impact force is applied to the gas manifold 3, the receiving seat 121 is not easily deformed. Therefore, the displacement of the gas manifold 3 due to the deformation of the receiving seat 121 can be suppressed.

Furthermore, in this embodiment, a portion 121c' of the bending flange portion 121c that protrudes forward from the receiving seat 121 is formed large. An engaging hole 34 into which the portion 121c' of the bent flange portion 121c is inserted is formed in the lateral end portion of the gas manifold 3. As shown in FIG. According to this, before the gas manifold 3 is fastened together to the receiving seat 121 and the mounting seat 64 as described above, the load of the gas manifold 3 can be received by the portion 121c' of the bent flange portion 121c. assembly workability is improved.

The nozzles 31 of the gas manifold 3 must be provided with nozzle holes 31a (see FIGS. 2 and 3) having different hole diameters depending on the type of gas used. The size of the portion 61 also needs to be varied according to the type of fuel gas used. That is, it is necessary to use a dedicated gas manifold 3 and a ventilation control plate 6 according to the type of fuel gas. Therefore, a protrusion 65 extending forward is provided at the lateral end of the ventilation control plate 6, and a through hole 35 into which the protrusion 65 can be inserted is provided at the lateral end of the gas manifold 3. As shown in FIG. At least one of the position and shape of the projection 65 and at least one of the position and shape of the through hole 35 are different between the ventilation adjusting plate 6 and the gas manifold 3 for different types of fuel gas that can be used. The protrusion 65 is inserted into the through-hole 35 so that the gas manifold 3 can be attached only when the gas manifold 3 and the ventilation adjustment plate 6 are combined with the same type of fuel gas that can be used. there is A claw portion 66 that engages with the upper edge of the gas manifold 3 is provided at the lateral end portion of the ventilation adjustment plate 6 so as to be positioned above the projection 65 .

Although the embodiments of the present invention have been described above with reference to the drawings, the present invention is not limited thereto. For example, in the above embodiment, the bending flange portion 121c for reinforcement is provided at the lower end of the receiving seat 121, but it is also possible to provide the bending flange portion 121c at the upper end of the receiving seat 121 or at both upper and lower ends. In the above-described embodiment, the mounting seat 64 overlapping the rear surface of the receiving seat 121 is provided at the lateral end of the ventilation adjustment plate 6, and the receiving seat 121 and the mounting seat 64 at the lateral end of the gas manifold 3 are fastened together. However, the mounting seat 64 may be omitted and the lateral end of the gas manifold 3 may be fastened only to the receiving seat 121 .

Reference Signs List 1 Combustion housing 12 Lateral side plate 121 Receiving seat 121b Bending corner portion 121c Bending flange portion 121c′ A portion of the bending flange portion protruding forward from the receiving seat 2 Burner 21... Mixing tube portion, 22... Inlet, 3... Gas manifold, 31... Nozzle, 34... Engagement hole.

Claims (2)

A combustion apparatus comprising a combustion housing and a plurality of burners arranged side by side in the combustion housing. A gas manifold in which a plurality of nozzles for injecting fuel gas from the front toward the inflow port of the mixing tube part are protruded corresponding to a plurality of burners,
A receiving seat is provided on the front end of the lateral side plate of the combustion housing and is bent in the lateral direction and abuts on the rear surface of the lateral end of the gas manifold. A combustion device, wherein a bending flange portion for reinforcement is formed over a bending corner portion of the proximal end of the side plate. 2. A combustion apparatus according to claim 1, wherein an engaging hole is formed in a lateral end of said gas manifold into which a portion of said bent flange portion protruding forward from said receiving seat is inserted.

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