JP7590189B2 - Combustion equipment - Google Patents

Description

The present invention relates to a combustion device that includes a combustion housing and multiple burners arranged side by side within the combustion housing.

Conventionally, this type of combustion device is equipped with a gas manifold from which nozzles protrude that inject fuel gas from the front toward the inlet of the mixing tube section of each burner, with the burners arranged side by side in the horizontal direction and the inlet opening direction of the mixing tube section of each burner facing forward, and a ventilation adjustment plate that is arranged behind the gas manifold and faces the inlet of the mixing tube section of each burner, and has openings through which the fuel gas and primary air pass (see, for example, Patent Document 1).

Conventionally, the ventilation adjustment plate and the gas manifold are connected separately to the combustion case.

JP 2019-78445 A

In order to ensure a stable flow of fuel gas and primary air into the inlet of the mixing tube of the burner, it is necessary to install the nozzle of the gas manifold in a specified positional relationship with the opening of the ventilation adjustment plate, that is, to ensure accurate positional correlation between the ventilation adjustment plate and the gas manifold. However, if the ventilation adjustment plate and the gas manifold are connected separately to the combustion case as in the above conventional example, it becomes difficult to ensure accurate positional correlation between the ventilation adjustment plate and the gas manifold due to the mounting tolerance of the ventilation adjustment plate and the mounting tolerance of the gas manifold relative to the combustion case.

In addition, if the ventilation adjustment plate and the gas manifold are connected separately to the combustion housing, the gas manifold can be installed even if the ventilation adjustment plate is forgotten to be installed. After the gas manifold is installed, the ventilation adjustment plate cannot be visually inspected, so there is a possibility that the ventilation adjustment plate will be left unattached.

In view of the above, the present invention aims to provide a combustion device that can accurately ensure the positional correlation between the ventilation adjustment plate and the gas manifold and also prevents the ventilation adjustment plate from being left unattached.

In order to solve the above problems, the present invention provides a combustion device comprising a combustion housing and a plurality of burners arranged side by side within the combustion housing, the arrangement direction of the burners being the horizontal direction and the opening direction of the inlet of the mixing tube section of each burner being the forward direction, the gas manifold having a nozzle protruding therefrom for injecting fuel gas from the front toward the inlet of the mixing tube section of each burner, and a ventilation adjustment plate arranged behind the gas manifold and facing the inlet of the mixing tube section of each burner and having an opening through which the fuel gas and primary air pass, the ventilation adjustment plate being characterized in that a protrusion portion is provided at a horizontal end of the ventilation adjustment plate , the protrusion portion extending while bending forward toward the gas manifold and defining the front-to-rear distance between the ventilation adjustment plate and the gas manifold, a connecting portion is provided at the protrusion portion , and the horizontal end of the gas manifold is connected to the connecting portion , and further a clamping portion is provided at a front end of a horizontal side plate of the combustion housing, the clamping portion being clamped between the horizontal end of the gas manifold and the protrusion portion .

According to the present invention, the lateral end of the gas manifold is connected to the connecting portion provided at the lateral end of the ventilation adjustment plate, so that the positional correlation between the ventilation adjustment plate and the gas manifold can be accurately ensured based on the connecting portion. Furthermore, if the ventilation adjustment plate is forgotten to be assembled, the gas manifold cannot be assembled, so forgetting to assemble the ventilation adjustment plate can also be prevented.

Furthermore, in the present invention, as described above, a protrusion portion is provided at the lateral end of the ventilation adjustment plate, which bends forward and extends toward the gas manifold, and which determines the front-to-rear distance between the gas manifold, and the above-mentioned connecting portion is provided on this protrusion portion , so that the front-to-rear distance between the ventilation adjustment plate and the gas manifold can be advantageously controlled by the protrusion portion.

Furthermore, according to the present invention, as described above , the clamping portion is provided at the front end of the lateral side plate of the combustion case, which is sandwiched between the lateral end of the gas manifold and the protruding piece, so that the gas manifold is supported by the overlapping portion of the two-plate structure where the protruding piece and the clamping portion overlap, improving the support strength of the gas manifold, thereby effectively preventing the gas manifold from shifting out of position due to vibration during transportation, etc.

In the present invention , it is preferable that the clamping portion is formed of a flange portion formed by bending the front end of the lateral side plate of the combustion case inwardly in the lateral direction and in contact with the rear surface of the lateral end of the gas manifold, a bent portion is formed at the front end of the protruding piece in contact with the rear surface of the flange portion, and a female screw is provided at this bent portion as the connecting portion, and the lateral end of the gas manifold is connected by screwing a male screw inserted into a mounting hole penetrating the front and rear of the lateral end of the gas manifold through a hole formed in the flange portion into the female screw. According to this, as described above, the front-rear distance between the ventilation adjustment plate and the gas manifold can be accurately controlled and the support strength of the gas manifold can be improved, and further, the gas manifold can be positioned relative to the combustion case by inserting the male screw into the hole formed in the flange portion.

1 is a perspective view of a combustion device according to an embodiment of the present invention; FIG. 2 is a cross-sectional side view taken along line II-II in FIG. 3 is a cross-sectional view taken along line III-III in FIG. 2 . FIG. 2 is an exploded perspective view of a main part of the combustion device according to the embodiment. FIG. 2 is an enlarged front view of a main part of the combustion device according to the embodiment. FIG. 6 is a cross-sectional side view taken along line VI-VI in FIG. 5 . FIG. 7 is a cross-sectional plan view taken along line VII-VII in FIG. 5 . 8A, 8B, and 8C are cross-sectional plan views of modified examples of the present invention corresponding to FIG. 7.

Referring to Figures 1 to 3, the combustion device according to an embodiment of the present invention includes a combustion housing 1, a plurality of burners 2 (six in this embodiment) arranged side by side in the lower part of the combustion housing 1, a gas manifold 3 that supplies fuel gas to the burners 2, and a heat exchanger 4 that is arranged in the upper part of the combustion housing 1 and is heated by the combustion gas from the burners 2. An upstream water supply pipe 41 and a downstream hot water outlet pipe 42 are connected to the heat exchanger 4. A valve unit 5 that controls the supply of fuel gas is connected to the gas manifold 3.

The burners 2 are arranged in a row in the horizontal direction, and each burner 2 is a flat burner with a long and narrow flame mouth at the top end in the front-rear direction, which is the horizontal direction perpendicular to the horizontal direction. A mixing tube section 21 is provided at the bottom of each burner 2. An inlet 22 that opens forward is provided at the front end of the mixing tube section 21. A plurality of nozzles 31 that inject fuel gas from the front toward the inlet 22 of the mixing tube section 21 of each burner 2 are protruding from the gas manifold 3 corresponding to the plurality of burners 2. The fuel gas ejected from each nozzle 31 flows into the inlet 22 of each burner 2, and the primary air flows into the inlet 22, generating a mixture of fuel gas and primary air in the mixing tube section 21. This mixture is ejected from the flame mouth of the burner 2 and combusted, 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 that covers the front portion of the combustion housing 1 located above the gas manifold 3, side plates 12, 12 on both sides in the lateral direction, a rear side plate 13, and a bottom plate 14. In addition, heat shield plates 15, 16, 17 are provided so as to face the inner surfaces of the front, lateral, and rear side plates 11, 12, 13.

Referring also to FIG. 4, the front part of the bottom plate 14 is formed with an upright plate part 141 that rises upward at the rear position of the gas manifold 3, and an upper plate part 142 that bends forward from the upper end of the upright plate part 141 and reaches the front side plate 11. The upright plate part 141 has an opening part 143 that faces the inlet 22 of the mixing tube part 21 of each burner 2. In addition, behind the gas manifold 3, specifically, on the front surface of the upright plate part 141, there is arranged a ventilation adjustment plate 6 that has a plurality of opening parts 61 through which the fuel gas and primary air pass, corresponding to the plurality of burners 2, facing the inlet 22 of the mixing tube part 21 of each burner 2.

The ventilation adjustment plate 6 is secured to the upright plate portion 141 by a screw 62 at the upper end of its horizontal center portion. The bottom plate 14 has multiple upward recesses 144 that sandwich the lower edge of each burner 2 from both sides in the horizontal direction. Furthermore, the front side plate 11 is fitted with 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.

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 the combustion gas is discharged to the outside through an exhaust pipe (not shown) connected to the outlet 92 of the fan 9. As shown in FIG. 4, a number of small holes 145 are formed in the bottom plate 14 of the combustion housing 1. Then, combustion air is supplied to each burner 2 by the suction force of the fan 9. That is, air sucked from the inlet 22 through each opening 61 of the ventilation adjustment plate 6 and each opening 143 of the upright plate portion 141 is supplied to each burner 2 as primary air for combustion, and air sucked from the small holes 145 is supplied to each burner 2 as secondary air for combustion.

In order to stably flow the fuel gas and primary air into the mixing tube section 21 of the burner 2, it is necessary to install the nozzle 31 of the gas manifold 3 in a predetermined positional relationship with respect to the opening 61 of the ventilation adjustment plate 6, that is, to accurately ensure the positional correlation between the ventilation adjustment plate 6 and the gas manifold 3. Therefore, in this embodiment, a connecting part 63 is provided at the lateral end of the ventilation adjustment plate 6, and the lateral end of the gas manifold 3 is connected to this connecting part 63. In addition, a protruding piece 64 that bends forward and extends toward the gas manifold 3 and determines the front-rear distance between the gas manifold 3 is provided at the lateral end of the ventilation adjustment plate 6, and the connecting part 63 is provided on this protruding piece 64. Furthermore, a clamping part 121 that is clamped between the lateral end of the gas manifold 3 and the protruding piece 64 is provided at the front end of the lateral side plate 12 of the combustion housing 1.

To explain more specifically with reference to Figs. 5 to 7, the lower front end of the lateral side plate 12 of the combustion housing 1 is extended forward from the upright plate portion 141 of the bottom plate 14, and the front end is bent inward in the lateral direction to provide the flange portion 121 as the clamping portion that contacts the rear surface of the lateral end of the gas manifold 3. In addition, a bent portion 641 is formed at the front end of the protruding piece portion 64, which is bent outward in the lateral direction to contact the rear surface of the flange portion 121, and the female screw 63 as the connecting portion is provided on this bent portion 641. Then, the male screw 33 inserted into the mounting hole 32 that penetrates from front to rear and formed at the lateral end of the gas manifold 3 is screwed into the female screw 63 through the hole 121a formed in the flange portion 121, thereby connecting the lateral ends of the gas manifold 3.

According to this, the lateral end of the gas manifold 6 is connected to the connecting portion (female screw) 63 provided at the lateral end of the ventilation adjustment plate 6, so that the positional correlation between the ventilation adjustment plate 6 and the gas manifold 3 can be accurately ensured based on the connecting portion 63, and furthermore, the front-to-rear distance between the ventilation adjustment plate 6 and the gas manifold 3 can be managed by the protruding portion 64 at the lateral end of the ventilation adjustment plate 6. Also, if the ventilation adjustment plate 6 is forgotten to be assembled, the gas manifold 3 cannot be assembled. Therefore, it is possible to prevent forgetting to assemble the ventilation adjustment plate 6. Furthermore, the gas manifold 3 is supported by the two-plate structure where the bending portion 641, which is a part of the protruding portion 64, and the clamping portion (flange portion) 121 overlap, and the support strength of the gas manifold 3 is improved. Therefore, it is possible to effectively prevent the gas manifold 3 from being displaced due to vibration during transportation. In addition, the male screw 33 for mounting the gas manifold 3 is inserted into the hole 121a formed in the flange portion 121, so the positioning of the gas manifold 3 relative to the combustion housing 1 can be performed at the same time.

In this embodiment, in order to increase the rigidity of the flange portion 121, a reinforcing bent edge portion 121c is formed at the lower end of the flange portion 121, extending to the bent corner portion 121b at the base end of the flange portion 121 relative to the side plate 12. The portion 121c' of this bent edge portion 121c that protrudes forward from the flange portion 121 is formed large. An engagement hole 34 into which the above-mentioned portion 121c' of the bent edge portion 121c is inserted is formed at the lateral end of the gas manifold 3. This allows the load of the gas manifold 3 to be borne by the above-mentioned portion 121c' of the bent edge portion 121c before the gas manifold 3 is connected to the connection portion 63, improving the ease of assembly of the gas manifold 3.

In addition, the nozzle 31 of the gas manifold 3 must be formed with nozzle holes 31a (see Figures 2 and 3) with different hole diameters depending on the type of gas used, and the size of the opening 61 formed in the ventilation adjustment plate 6 must also be different depending on the type of fuel gas used. That is, it is necessary to use a dedicated gas manifold 3 and ventilation adjustment plate 6 according to the type of fuel gas. Therefore, a protrusion 65 extending forward is provided at the lateral end of the ventilation adjustment 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. At least one of the position and shape of the protrusion 65 and at least one of the position and shape of the through hole 35 differ for the ventilation adjustment plate 6 and gas manifold 3 that can be used with different types of fuel gas. Only when the gas manifold 3 and the ventilation adjustment plate 6 that can be used with the same type of fuel gas are combined, the protrusion 65 is inserted into the through hole 35, and the gas manifold 3 can be assembled. Furthermore, at the lateral end of the ventilation adjustment plate 6, a claw portion 66 is provided that is positioned above the protrusion 65 and engages with the upper edge of the gas manifold 3.

Next, the modified examples shown in Figures 8(a), (b), and (c) will be described. In the modified example shown in Figure 8(a), a forward-bending protrusion 64 is formed at the lateral end of the ventilation adjustment plate 6 so as to follow the inner surface of the lateral side plate 12 of the combustion housing 1, and a bent portion 641 is formed at the front end of the protrusion 64 by bending it laterally inward and contacting the rear surface of the flange portion 121 that serves as the clamping portion of the front end of the side plate 12. The other structures are the same as those of the above embodiment.

In the modified example shown in FIG. 8(b), a rearward bent portion 36 is formed at the lateral end of the gas manifold 3 so as to overlap the outer surface of the front end of the lateral side plate 12 of the combustion housing 1, and a forward bent protruding piece 64 is formed at the lateral end of the ventilation adjustment plate 6 so as to overlap the inner surface of the front end of the side plate 12. In this modified example, the front end of the side plate 12 forms a clamping portion 121 that is sandwiched between the bent portion 36, which is the lateral end of the gas manifold 3, and the protruding piece 64 of the ventilation adjustment plate 6. Then, the male screw 33 inserted into the mounting hole 32 formed in the bent portion 36 is screwed into the female screw 63, which is the connecting portion formed on the protruding piece 64, through the hole 121a formed in the clamping portion 121.

In the modified example shown in FIG. 8(c), a clamping portion is not formed at the front end of the lateral side plate 12 of the combustion housing 1 between the protruding piece 64 at the lateral end of the ventilation adjustment plate 6 and the bending portion 36 at the lateral end of the gas manifold 3, and the bending portion 36 is directly overlapped on the outer surface of the protruding piece 64. Then, the male screw 33 inserted into the mounting hole 32 formed in the bending portion 36 is screwed into the female screw 63 formed in the protruding piece 64 as a connecting portion.

Although the embodiment of the present invention has been described above with reference to the drawings, the present invention is not limited thereto. For example, in the above embodiment, the connection part of the gas manifold 3 provided on the ventilation adjustment plate 6 is configured with a female screw 63, but this connection part can also be configured with a male screw implanted in the ventilation adjustment plate 6. In this case, the gas manifold 3 can be connected by inserting the male screw into a hole formed in the gas manifold 3 and tightening a nut onto this male screw.

1...combustion housing, 12...lateral side plate, 121...clamping portion (flange portion), 121a...hole formed in flange portion, 2...burner, 21...mixing tube portion, 22...inlet, 3...gas manifold, 31...nozzle, 32...mounting hole, 33...male thread, 6...ventilation adjustment plate, 61...opening, 63...connecting portion (female thread), 64...projection portion, 641...bent portion.

Claims (2)

A combustion device comprising a combustion case and a plurality of burners arranged side by side within the combustion case, the burners being arranged side by side in a horizontal direction and the opening direction of the inlet of the mixing tube section of each burner being forward, the device comprising a gas manifold from which nozzles for injecting fuel gas from the front toward the inlet of the mixing tube section of each burner are protruded, and a ventilation adjustment plate disposed behind the gas manifold and facing the inlet of the mixing tube section of each burner, the ventilation adjustment plate having openings through which the fuel gas and primary air pass,
a protruding piece portion is provided at a lateral end of the ventilation adjustment plate, the protruding piece portion being bent forward and extending toward the gas manifold, and defining a front-rear distance between the gas manifold and the protruding piece portion; a connecting portion is provided at the protruding piece portion ; and a lateral end of the gas manifold is connected to the connecting portion ;
The combustion apparatus further comprises a clamping portion provided at a front end of a lateral side plate of the combustion housing, the clamping portion being clamped between the lateral end of the gas manifold and the protruding piece . 2. The combustion apparatus according to claim 1, wherein the clamping portion is formed by a flange portion formed by bending the front end of the side plate laterally inward and in contact with the rear surface of the lateral end of the gas manifold, and a bent portion is formed at the front end of the protruding piece so as to be in contact with the rear surface of the flange portion, and a female screw is provided at this bent portion as the connecting portion, and the lateral ends of the gas manifold are connected by threading a male screw inserted into a mounting hole penetrating from front to rear formed in the lateral end of the gas manifold through a hole formed in the flange portion and into the female screw.

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