Combustion equipment

Abstract

To provide a combustor comprising a burner arranged in a combustion housing 1 and an exhaust fan for suctioning / exhausting combustion gas occurring due to combustion of the burner, in which an inspection hole 9 capable of visually recognizing flame of the burner is provided on a side plate 11 of the combustion housing 1, and which can prevent a user from feeling uneasy even when a transparent plate is not attached to the inspection hole 9, and reduce costs.SOLUTION: A second inspection hole 9' is provided on an inner plate in a combustion housing 1 so as to face an inner surface of a side plate 11 of the combustion housing 1, and is displaced from an inspection hole 9 when viewed from a normal direction of the side plate 11. By looking into the inspection hole 9 from a direction connecting the inspection hole 9 and the second inspection hole 9', which is inclined with respect to the normal direction of the side plate 11, burner flame is made visible through the second inspection hole 9'.SELECTED DRAWING: Figure 4

Description

[Technical field]

[0001] The present invention relates to a combustion device including a combustion housing, a burner disposed within the combustion housing, and an exhaust fan that draws in and exhausts combustion gas generated by the combustion of an air-fuel mixture ejected from the burner. [Background technology]

[0002] In a combustion device in which a burner is disposed in a combustion housing, a peephole is provided in a specific side plate of the combustion housing to enable visual observation of the burner flame in order to check the combustion state of the burner. In a combustion device in which combustion air is forced into the combustion housing by a fan, it is necessary to prevent combustion gas from leaking out of the combustion housing. Conventionally, therefore, a heat-resistant transparent plate is attached to the peephole to prevent combustion gas from leaking out of the peephole (see, for example, Patent Document 1).

[0003] On the other hand, in a combustion device equipped with an exhaust fan (see, for example, Patent Document 2), combustion gas does not leak out from the peep hole opened in the side plate of the combustion housing, even if a transparent plate is not attached to the peep hole. However, simply opening a peep hole in the side plate may cause users to feel uneasy. For this reason, in the past, even in combustion devices equipped with exhaust fans, a transparent plate was attached to the peep hole, which was a factor in increasing costs. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] JP 2002-333216 A [Patent Document 2] JP 2016-29316 A Summary of the Invention [Problem to be solved by the invention]

[0005] To provide a combustion device equipped with an exhaust fan in consideration of the above points, which does not cause a user to feel uneasy even if a transparent plate is not attached to the peephole, and which can reduce costs. [Means for solving the problem]

[0006] In order to solve the above problems, the present invention provides a combustion device comprising a combustion housing, a burner disposed within the combustion housing, and an exhaust fan for sucking in and exhausting combustion gas generated by the combustion of an air-fuel mixture ejected from the burner, wherein a peephole is provided in a predetermined side plate of the combustion housing to enable visual observation of the burner flame, and a second peephole is provided in an inner plate provided within the combustion housing so as to face the inner surface of the predetermined side plate, the second peephole being shifted in position from the first peephole when viewed from the normal direction of the predetermined side plate, No transparent plate is attached to the peephole and the second peephole, The burner flame can be seen through the second peephole by looking into the peephole from a direction connecting the first peephole and the second peephole, which is inclined with respect to the normal direction of a specified side panel.

[0007] According to the present invention, even if a user looks into the peephole from the normal direction of a specific side plate, the back of the peephole appears blocked, and the user does not feel uneasy. If a user intentionally looks into the peephole from a direction inclined as described above with respect to the normal direction of the specific side plate in order to check the combustion state of the burner, the burner flame can be seen. Therefore, even if a transparent plate is not attached to the peephole, it can function as a hole for checking combustion without making the user feel uneasy. And the inner plate is a conventionally provided one, and does not cause an increase in costs. As a result, costs can be reduced by the amount of the transparent plate being omitted.

[0008] If the peephole and the second peephole are made larger, more air is drawn in through them, and the amount of combustion air that should be supplied by the suction force of the exhaust fan decreases. On the other hand, if the peephole and the second peephole are made smaller, the visibility of the burner flame decreases.

[0009] Therefore, in the present invention, it is preferable that a plurality of peepholes are provided in the predetermined side plate, and a plurality of second peepholes are provided in the heat shield plate corresponding to the plurality of peepholes, and that the direction and amount of positional deviation of each of the second peepholes from each of the first peepholes are all the same. In this way, even if each peephole and each second peephole are made small, the burner flame can be clearly seen through the plurality of peepholes and the plurality of second peepholes. [Brief description of the drawings]

[0010] [Figure 1] 1 is a perspective view of a combustion device according to an embodiment of the present invention; [Diagram 2] FIG. 2 is a cross-sectional side view taken along line II-II in FIG. [Diagram 3] 3 is a cross-sectional view taken along line III-III in FIG. 2. [Figure 4] FIG. 2 is an enlarged front view of a main part of the combustion device according to the embodiment. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0011] 1 to 3, a 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 for supplying fuel gas to the burners 2, and a heat exchanger 4 arranged in the upper part of the combustion housing 1 and 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 for controlling the supply of fuel gas is connected to the gas manifold 3.

[0012] The burners 2 are arranged in a row in the horizontal direction, and each burner 2 is a flat burner having a flame port at its upper end that is elongated in the front-rear direction, which is a horizontal direction perpendicular to the horizontal direction. A mixing tube section 21 is provided at the lower part 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 protrudingly provided in 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, so that a mixture of the fuel gas and the primary air is generated in the mixing tube section 21, and the mixture is ejected from the flame port of the burner 2 and combusted, and the heat exchanger 4 is heated by the combustion gas generated by this combustion.

[0013] 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 lateral sides, a rear side plate 13, and a bottom plate 14. In addition, heat insulating inner plates 15, 16, 17 are provided so as to face the inner surfaces of the front, lateral, and rear side plates 11, 12, 13.

[0014] At the front part of the bottom plate 14, there are formed an upright plate part 141 rising upward at a rear position of the gas manifold 3, and an upper plate part 142 bending forward from the upper end of the upright plate part 141 to reach the front side plate 11. An opening part 143 facing the inlet 22 of the mixing tube part 21 of each burner 2 is opened in the upright plate part 141. In addition, at the front face of the upright plate part 141, there is arranged a ventilation adjustment plate 6 having a plurality of opening parts 61 facing the inlet 22 of the mixing tube part 21 of each burner 2 and through which the fuel gas and primary air pass, corresponding to the plurality of burners 2.

[0015] The ventilation adjustment plate 6 is fixed at the upper end of its horizontal center to the standing plate portion 141 by a screw 62. The bottom plate 14 has a plurality of upward recesses 144 that sandwich the lower edge of each burner 2 from both sides in the horizontal direction, and also has a large number of small holes 145 formed therein.

[0016] An exhaust fan 7 is connected to the upper end of the combustion housing 1 via an exhaust hood 71. A fan motor 72 is attached to the exhaust fan 7. The combustion gas that has passed through the heat exchanger 4 is sucked into the exhaust fan 7, and the combustion gas is discharged to the outside through an exhaust pipe (not shown) connected to an outlet 73 of the exhaust fan 7. In addition, combustion air is supplied to each burner 2 by the suction force of the exhaust fan 7. That is, air sucked from the inlet 22 through each opening 61 of the ventilation adjustment plate 6 and each opening 143 of the standing 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.

[0017] An electrode part 8 having an ignition electrode 81 for igniting the burner 2 and a flame rod 82 for detecting the flame of the burner 2 is attached to the front side plate 11 of the combustion housing 1. The front side plate 11 is further provided with a peep hole 9 for visually observing the flame of the burner 2, located to one side in the lateral direction (to the right when viewed from the front) away from the attachment position of the electrode part 8. The peep hole 9 will be described in detail below with reference to FIG. 4.

[0018] Three peepholes 9 are opened in the normal direction of the front side panel 11, i.e., at the vertices of an inverted triangle when viewed from the front. Three second peepholes 9' are opened in the heat shield plate 15 facing the inner surface of the front side panel 11, at the vertices of an inverted triangle congruent with the above-mentioned inverted triangle (see Figs. 3 and 4). Each second peephole 9' is shifted diagonally downward and to the left from the other peepholes 9 when viewed from the front. The direction and amount of shift of each second peephole 9' from each other peephole 9 are all the same. Moreover, no transparent plate is attached to each of the peepholes 9 and each of the second peepholes 9'.

[0019] According to this, even if a user looks into the peephole 9 from the front, the back of the peephole 9 appears blocked, and the user does not feel uneasy. If a user intends to check the combustion state of the burner 2 by looking into the peephole 9 from a direction connecting each peephole 9 and the second peephole 9', which is inclined with respect to the front-rear direction (the normal direction of the front side panel 11), the flame of the burner 2 can be seen. Therefore, even if a transparent plate is not attached to the peephole 9, it can function as a hole for checking combustion without making the user feel uneasy. And the heat shield plate 15 is originally provided and does not cause an increase in cost. As a result, the cost can be reduced by the amount of the transparent plate being omitted.

[0020] Incidentally, it is also conceivable to improve the visibility of the flame of the burner 2 by configuring the peephole 9 and the second peephole 9' as a single large hole. However, this would result in more air being drawn in through the peephole 9 and the second peephole 9', and would reduce the combustion air that should be supplied by the suction force of the exhaust fan 7. In contrast, in this embodiment, by providing a plurality of peepholes 9 and a plurality of second peepholes 9', even if each peephole 9 and second peephole 9' is made small so as not to impede the suction of the combustion air, it is advantageous that the flame of the burner 2 can be well viewed through the plurality of peepholes 9 and the plurality of second peepholes 9'.

[0021] 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 peep hole 9 is provided in the front side plate 11 of the combustion case 1, but it is also possible to provide a peep hole in the lateral side plate 12 or the rear side plate 13. In addition, although the above embodiment is an application of the present invention to a combustion device for hot water supply, the present invention can be similarly applied to a combustion device for purposes other than hot water supply as long as it is equipped with an exhaust fan. [Explanation of symbols]

[0022] 1...combustion box, 11...front side panel (specified side panel), 15...heat shield, 2...burner, 7...exhaust fan, 9...peephole, 9'...second peephole.

Claims

1. A combustion device comprising a combustion case, a burner disposed in the combustion case, and an exhaust fan for sucking in and exhausting combustion gas generated by the combustion of a mixture ejected from the burner, the device having a peephole in a predetermined side plate of the combustion case through which the flame of the burner can be visually observed, A combustion device characterized in that an inner plate provided inside a combustion chamber so as to face the inner surface of a specified side plate has a second peephole offset in position from the peephole when viewed from the normal direction of the specified side plate, and no transparent plate is attached to the peephole or the second peephole, and the burner flame can be seen through the second peephole by looking into the peephole from a direction connecting the peephole and the second peephole, which is inclined with respect to the normal direction of the specified side plate.

2. The combustion device according to claim 1, characterized in that a plurality of the peepholes are opened in the specified side plate, and a plurality of the second peepholes are opened in the inner plate corresponding to the plurality of peepholes, and the positional shift direction and positional shift amount of each second peephole relative to each of the peepholes are all the same.

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