JP6853117B2 - Combustion device - Google Patents

Description

In the present invention, a plurality of flat burners having a combustion casing and having a longitudinal flame port in the front-rear direction at the upper end are arranged side by side in the combustion chamber in the combustion chamber, and an air-fuel mixture ejected from the flame ports of these flat burners. The present invention relates to a combustion apparatus in which the combustion gas generated by the combustion of the above is sucked by an exhaust fan and exhausted to the outside.

Conventionally, as a combustion device of this type, according to Patent Document 1, a partition plate on the lower surface of the combustion chamber and an upright plate rising from the front end of the partition plate along the lower front end of the flat burner are provided in the combustion chamber. On the upright plate, each introduction port that communicates with the inflow port that opens at the lower front end of each flat burner is opened, and a gas manifold with each gas nozzle facing each introduction port protruding from the rear surface is arranged in front of the upright plate. , Primary air is supplied from the space between the gas manifold and the upright plate to the inflow port of each flat burner through each inlet, and secondary to the combustion chamber through a large number of distribution holes formed in the partition plate. It is known that air is supplied. Further, in this case, the combustion casing is provided with a bottom plate located below the partition plate, and the supply is communicated between the bottom plate and the partition plate through the air supply port provided in the bottom plate to the external space of the combustion casing. The air chamber is defined, and the space between the gas manifold and the upright plate is communicated with this air supply chamber.

In the above conventional example, the air in the air supply chamber is easily supplied as secondary air to the combustion chamber through the distribution holes by the suction force of the exhaust fan, and the space between the gas manifold and the upright plate is created from the air supply chamber. The primary air supplied to the inlet of the flat burner via the air is likely to be insufficient. In order to reduce the proportion of the air in the air supply chamber supplied as secondary air and eliminate the shortage of primary air, it is necessary to reduce the number of distribution holes. However, in this case, since the ventilation resistance increases, it is necessary to increase the fan rotation speed, which increases the power consumption and the fan noise.

Japanese Unexamined Patent Publication No. 2016-29316

In view of the above points, it is an object of the present invention to provide a combustion device capable of solving the primary air shortage without reducing the number of distribution holes.

In order to solve the above problems, in the present invention, a plurality of flat burners having a combustion casing and having a flame port portion long in the front-rear direction at the upper end are arranged side by side in the combustion chamber in the combustion chamber, and these flattening. It is a combustion device in which the combustion gas generated by the combustion of the air-fuel mixture ejected from the flame port of the burner is sucked by an exhaust fan and exhausted to the outside. An upright plate that rises from the front end of the partition plate along the lower front end of the flat burner is provided, and each introduction port is opened in the upright plate to communicate with the inflow port that opens at the lower front end of each flat burner. A gas manifold with each gas nozzle facing the rear surface is arranged facing the front of the upright plate, and primary air flows from the space between the gas manifold and the upright plate to the inflow port of each flat burner through each inlet. In the case where the secondary air is supplied to the combustion chamber through a large number of distribution holes formed in the partition plate while being supplied, the lower part of the space between the gas manifold and the upright plate is the outside of the combustion chamber. A first ventilation path that communicates with the space and a second ventilation path that communicates the upper part of the space between the gas manifold and the upright plate to the external space of the combustion chamber are provided, and the space between the gas manifold and the upright plate is provided. The side ends on both sides of the combustion chamber are closed so as not to communicate with the external space of the combustion chamber, and are located at a position equivalent to half the distance between the gas nozzles in the lateral direction from the outermost gas nozzle in the lateral direction. It is characterized in that a vertically longitudinal barrier portion that faces the outermost gas nozzle in the lateral direction and is in contact with the rear surface of the gas manifold is provided.

According to the present invention, since the space between the gas manifold and the upright plate communicates with the external space of the combustion casing through the first and second air passages, suction by the exhaust fan acting through the distribution holes Air flows from the external space of the combustion casing to the space between the gas manifold and the upright plate through each ventilation path without being affected by the force, and from this space to the inflow port of the flat burner through the inlet. Primary air is supplied. Therefore, the primary air shortage can be eliminated without reducing the number of distribution holes formed in the partition plate. As a result, it is not necessary to increase the rotation speed of the exhaust fan, and problems such as an increase in power consumption and an increase in fan noise can be prevented.

Here, if the space between the gas manifold and the upright plate communicates with the external space even at the side ends on both sides in the lateral direction, the first and second inflow ports of the flat burner on the outermost side in the lateral direction Not only the air flowing in from the air passage but also the air flowing in from the side end portion is supplied as the primary air, and the amount of the primary air supplied to the outermost flat burner becomes excessive. Further, even if the side end is closed, if the outermost air gap in the lateral direction of the gas nozzle is wide, the outermost gas nozzle passes from the first and second air passages to the outer side in the lateral direction. The amount of air directed to the outermost inlet is greater than the amount of air directed laterally outward of the other gas nozzle to the corresponding inlet, and the amount of primary air supplied to the outermost flat burner is excessive. It is easy to become. On the other hand, in the present invention, air does not flow in from the side end portion, and the air passes from the first and second air passages to the outermost inlet through the lateral outer side of the outermost gas nozzle. The amount of air going is limited by the barrier so that it is equal to the amount of air going through the lateral outer side of the other gas nozzle to the corresponding inlet. As a result, an appropriate amount of primary air similar to that of other flat burners can be supplied to the outermost flat burner.

The perspective view of the combustion apparatus of 1st Embodiment of this invention. The cut side view cut by the line II-II of FIG. The cut plan view cut along the line III-III of FIG. An enlarged cross-sectional view of the upper part of the flat burner used in the combustion apparatus of the embodiment. The cut side view of the main part of the combustion apparatus of 2nd Embodiment. FIG. 5 is a cut plan view cut along the VI-VI line of FIG. The cut plan view of the main part of the combustion apparatus of 3rd Embodiment.

With reference to FIGS. 1 and 2, the combustion apparatus according to the embodiment of the present invention includes a combustion casing 1. In the combustion chamber 1a in the combustion chamber 1, a plurality of flat burners 2 having a flame port long in the front-rear direction at the upper end and an inflow port opening at the lower front end are arranged side by side in the lateral direction. Further, the front plate portion 11 on the upper front surface of the combustion casing 1 is provided with an ignition electrode 12 and a frame rod 13 facing above the flat burner 2 and a viewing window 14. Although not shown, the combustion gas generated by the combustion of the air-fuel mixture ejected from the flame port of the flat burner 2 passes through the heat exchanger, is sucked by the exhaust fan, and is exhausted to the outside.

As shown in FIG. 4, the flat burner 2 of the present embodiment has a light flame port 21 that ejects a light mixture having a fuel concentration leaner than the stoichiometric air-fuel ratio and a light flame port 21 on both lateral sides of the light flame port 21. It is located and has a concentrated flame port 22 that ejects a concentrated air-fuel mixture having a fuel concentration higher than that of the light air-fuel mixture. It is composed of a light and shade burner having a high inflow port 24 for a deep flame port 22 located. A plurality of straightening vanes 21a are mounted in the light flame port 21. Further, on both sides of the light flame port 21, return areas 21b are provided between the light flame port 21 and the deep flame port 22 so that the air-fuel mixture does not eject.

Inside the combustion chamber 1, a partition plate 3 on the lower surface of the combustion chamber 1a and an upright plate 4 rising from the front end of the partition plate 3 along the lower front end of the flat burner 2 are provided. A large number of distribution holes 31 are formed in the partition plate 3. Then, the secondary air is supplied to the combustion chamber 1a through the distribution holes 31 by the suction force of the exhaust fan. In the present embodiment, the bottom surface of the combustion chamber 1 located below the partition plate 3 is open, but the bottom surface is closed by the bottom plate, and the air flowing in from the air supply port opened in the bottom plate is distributed through the distribution hole 31. It may be supplied to the combustion chamber 1a as secondary air via the air.

The upright plate 4 is provided with a light introduction port 41 and a concentrated introduction port 42, which communicate with each of the light flow inlet 23 and the concentrated flow inlet 24 of each flat burner 2. A damper plate 5 having an opening overlapping the light introduction port 41 and the dark introduction port 42 is attached to the front surface of the upright plate 4. Further, the upper end of the upright plate 4 is bent forward to reach the lower end of the front plate portion 11.

A gas manifold 6 is arranged in front of the upright plate 4 so as to face each other. On the rear surface of the gas manifold 6, each light gas nozzle 61 facing each light introduction port 41 and each concentrated gas nozzle 62 facing each dense introduction port 42 are provided so as to project. Then, the fuel gas injected from each fresh gas nozzle 61 is supplied to the fresh flow inlet 23 of each flat burner 2 through each fresh introduction port 41, and each from the space between the gas manifold 6 and the upright plate 4. Primary air is supplied to the fresh flow inlet 23 of each flat burner 2 through the fresh inlet 41, and the light generated by mixing fuel gas and primary air in the mixing passage in the flat burner 2 connected to the fresh flow inlet 23. The air-fuel mixture is ejected from the light flame port 21. Further, the fuel gas injected from each concentrated gas nozzle 62 is supplied to the concentrated inflow port 24 of each flat burner 2 through each concentrated introduction port 42, and each from the space between the gas manifold 6 and the upright plate 4. Primary air is supplied to the concentrated inflow port 24 of each flat burner 2 through the concentrated inlet 42, and is generated by mixing the fuel gas and the primary air in the mixing passage in the flat burner 2 connected to the concentrated inflow port 24. The concentrated air-fuel mixture is ejected from the concentrated flame port 22.

Here, in the present embodiment, the lower part of the space between the gas manifold 6 and the upright plate 4 is communicated with the external space of the combustion casing 1 between the first air passage 7 and the gas manifold 6 and the upright plate 4. A second ventilation passage 8 that communicates the upper part of the space with the external space of the combustion casing 1 is provided. Therefore, the gas manifold 6 and the upright plate are not affected by the suction force of the exhaust fan acting through the distribution hole 31 from the external space of the combustion casing 1 via the first and second ventilation passages 7 and 8. Air flows into the space between the room 4 and the primary air is supplied from this space to the light and dark inlets 23 and 24 of the flat burner 2 via the light and dark inlets 41 and 42. Therefore, the primary air shortage can be solved without reducing the number of distribution holes 31 formed in the partition plate 3. As a result, it is not necessary to increase the rotation speed of the exhaust fan, and problems such as an increase in power consumption and an increase in fan noise can be prevented.

Further, in the present embodiment, the rear surface of the gas manifold 6 is inclined forward with the first oblique guide surface 71 facing the first ventilation passage 7 and downward with respect to the second ventilation passage 8. It forms an upper second oblique guide surface 81. Further, a first oblique guide plate 72 that extends downwardly from the vicinity of the lower end of the light introduction port 41 and defines a first ventilation passage 7 with the first oblique guide surface 71, and a dense introduction port. A second oblique guide plate 82 that extends from the vicinity of the upper end of the 42 so as to rise forward and defines a second ventilation passage 8 with the second oblique guide surface 81 is provided. According to this, the primary air can be smoothly flowed from the first and second air passages 7 and 8 toward the light and dark introduction ports 41 and 42. In this embodiment, the first and second oblique guide plates 72 and 82 are integrally formed with the damper plate 5 in order to reduce the number of parts.

By the way, if the space between the gas manifold 6 and the upright plate 4 communicates with the external space even at the side ends on both sides in the lateral direction, the light and dark inflow ports 23 of the flat burner 2 on the outermost side in the lateral direction 23. , 24, not only the air flowing in from the first and second air passages 7 and 8 but also the air flowing in from the side end portion is supplied as the primary air, and is supplied to the outermost flat burner 2. The amount of primary air becomes excessive. Therefore, in the present embodiment, as shown in FIG. 3, a side plate portion 51 that bends forward and comes into contact with the rear surface of the gas manifold 6 is bent at the side end portions on both sides in the lateral direction of the damper plate 5, and the side plate portion 51 is formed. Therefore, the side ends of the space between the gas manifold 6 and the upright plate 4 on both sides in the lateral direction are closed.

However, even if the side ends of the space between the gas manifold 6 and the upright plate 4 on both sides in the lateral direction are closed, if the outermost gap in the lateral direction of the fresh gas nozzle 61 in the lateral direction is wide, the first The amount of air from the air passage 7 to the outermost light introduction port 41 through the lateral outer side of the outermost light gas nozzle 61 passes through the lateral outer side of the other light gas nozzle 61 and corresponds to the light introduction port. It will be more than the amount of air toward 41. That is, in the light gas nozzle 61 other than the outermost side, the width of the air flow path from the lateral outer side to the corresponding light introduction port 41 is half the distance between the light gas nozzles 61 and 61, so that it is the outermost side. When the width of the lateral outer gap of the fresh gas nozzle 61 is wider than half of the distance between the fresh gas nozzles 61 and 61, the amount of primary air supplied to the fresh air inlet 23 of the outermost flat burner 2 is excessive. It is easy to become.

Therefore, in the present embodiment, as shown in FIG. 3, the outermost position is located at a position equal to half the distance between the light gas nozzles 61 and 61 laterally outward from the outermost fresh gas nozzle 61 in the lateral direction. A long barrier portion 9 is provided in the vertical direction facing the fresh gas nozzle 61 in the lateral direction and in contact with the rear surface of the gas manifold 6. In this embodiment, the barrier portion 9 is integrally molded with the gas manifold 6.

When the barrier portion 9 is provided in this way, the amount of air from the first air passage 7 to the outermost light introduction port 41 through the lateral outer side of the outermost fresh gas nozzle 61 is limited by the barrier portion 9. Then, it becomes equal to the amount of air passing through the lateral outer side of the other fresh gas nozzle 61 toward the corresponding light introduction port 41. As a result, an appropriate amount of primary air similar to that of the other flat burners 2 can be supplied to the fresh flow inlet 23 of the outermost flat burner 2.

Since the primary air is not excessively supplied to the concentrated inflow inlet 24 of the outermost flat burner 2 even if the barrier portion 9 is not provided, the diagonal half portion on the tip side of the concentrated gas nozzle 62 is the barrier portion. Although the upper end of the barrier portion 9 is cut diagonally so as to be located above 9, the height and shape of the upper end of the barrier portion 9 so that the entire concentrated gas nozzle 62 is located below the upper end of the barrier portion 9. May be set. Further, in the present embodiment, a gap in the front-rear direction is provided between the rear end of the barrier portion 9 and the damper plate 5, but the rear end of the barrier portion 9 may be brought into contact with the damper plate 5.

Next, the second embodiment shown in FIGS. 5 and 6 will be described. In the second embodiment, the side plate portions 43 in contact with the rear surface of the side end portions of the gas manifold 6 are curved at the side end portions on both sides in the lateral direction of the upright plate 4, and the space between the gas manifold 6 and the upright plate 4 is formed. The side ends on both sides in the lateral direction are blocked. The position of the side plate portion 43 is set so as to be separated from the outermost light gas nozzle 61 in the lateral direction by the same distance as half of the distance between the light gas nozzles 61 and 61 in the lateral direction. As a result, the vertically longitudinal barrier portion 9 in contact with the rear surface of the gas manifold 6 in a state of facing the outermost fresh gas nozzle 61 in the lateral direction is formed by the side plate portion 43.

Further, in the third embodiment shown in FIG. 7, the side of the space between the gas manifold 6 and the upright plate 4 is in contact with the rear surface of the side end portion of the gas manifold 6 curved on both sides in the lateral direction of the damper plate 5. The position of the side plate portion 51 that closes the side end portions on both sides in the direction is set to a position equivalent to half the distance between the fresh gas nozzles 61 and 61 laterally outward from the outermost fresh gas nozzle 61 in the lateral direction. .. As a result, the vertically longitudinal barrier portion 9 in contact with the rear surface of the gas manifold 6 in a state of facing the outermost fresh gas nozzle 61 in the lateral direction is composed of the side plate portion 51.

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 flat burner 2 is composed of a light and shade burner, but a normal Bunsen burner may be used to form the flat burner. In this case, the upright plate 4 is provided with an introduction port that communicates with a single inflow port that opens at the lower front end of each flat burner, and the introduction port is provided through the first and second ventilation passages 7 and 8. The primary air should be directed.

1 ... Combustion box, 1a ... Combustion chamber, 2 ... Flat burner, 21,22 ... Flame port, 23,24 ... Inlet, 3 ... Partition plate, 31 ... Distribution hole, 4 ... Standing plate, 41,42 ... Introduction port , 6 ... Gas manifold, 61, 62 ... Gas nozzle, 7 ... 1st vent, 8 ... 2nd vent, 9 ... Barrier.

Claims (1)

A plurality of flat burners having a combustion casing and having a longitudinal flame port in the front-rear direction at the upper end are arranged side by side in the combustion chamber in the combustion chamber, and are generated by combustion of an air-fuel mixture ejected from the flame ports of these flat burners. It is a combustion device that sucks combustion gas with an exhaust fan and exhausts it to the outside. It stands in the combustion chamber along the partition plate on the lower surface of the combustion chamber and the front end of the partition plate along the lower front end of the flat burner. An upright plate is provided, and each introduction port that communicates with the inflow port that opens at the lower front end of each flat burner is opened on the upright plate, and a gas manifold in which each gas nozzle facing each introduction port is projected on the rear surface. It is arranged facing the front of the upright plate, primary air is supplied from the space between the gas manifold and the upright plate to the inflow port of each flat burner through each inlet, and a large number of distribution holes formed in the partition plate. In the case where the secondary air is supplied to the combustion chamber via
The first air passage that communicates the lower part of the space between the gas manifold and the upright plate to the outer space of the combustion casing, and the second that communicates the upper part of the space between the gas manifold and the upright plate to the outer space of the combustion casing. There is a ventilation path,
The lateral end portions of the space between the gas manifold and the upright plate are closed so as not to communicate with the external space of the combustion casing, and the distance between the gas nozzles in the lateral direction from the outermost gas nozzle in the lateral direction. A combustion device characterized in that a vertically longitudinal barrier portion that faces the outermost gas nozzle in the lateral direction and is in contact with the rear surface of the gas manifold is provided at a position equivalent to half of the above.

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