JP2023135708A - Combustion apparatus - Google Patents

Abstract

To provide a combustion apparatus including a plurality of burners 3 long in the longitudinal direction, consisting of rich-lean burners, and parallelly provided in the lateral direction, in a combustion chamber 1a on the upper side of a partition plate 2 in a combustion casing 1, a main vent hole 41 and a pilot vent hole 42 facing a main inflow port 33 and a pilot inflow port 34 opened to the lower part front ends of the burners 3, respectively, and formed in an air control plate 4 mounted on the front face of an erected plate 22 at the front end of the partition plate 2, and a sheet-plate gas manifold 5 formed by applying drawing molding to a main nozzle 51 and a pilot nozzle 52 for injecting combustion gas toward the main inflow port 33 and the pilot inflow port 34, and provided in front of the erected plate 22, capable of preventing the shortage of the amount of primary air to flow into the pilot inflow port 34 resulting from a shorter distance between a front end face 52a of the pilot nozzle 52 and the air control plate 4.SOLUTION: In part of the vicinity of a pilot vent hole 42 of an air control plate 4, a positioning protruding part 43 is provided protruding frontward for abutting on the front end face 52a of the pilot nozzle 52.SELECTED DRAWING: Figure 1

Description

The present invention includes a combustion case, and the combustion case is provided with a partition plate that partitions the space inside the combustion case into a combustion chamber and an air supply chamber on the lower side of the combustion chamber. A plurality of burners are arranged in parallel in the horizontal direction, and an upright plate is provided that rises from the front end of the partition plate along the lower front edges of the plurality of burners. The present invention relates to a combustion apparatus including a gas manifold defining a communicating primary air chamber.

Conventionally, in this type of combustion device, each burner has a main flame port at the upper end that ejects a lean mixture with a fuel concentration lower than the stoichiometric air-fuel ratio, and a rich mixture with a fuel concentration higher than the stoichiometric air-fuel ratio. a main flame inlet connected to the main flame outlet, which is opened at the lower front end so as to face the upright plate; A burner is known that is configured with a light/dark burner having a side flame inlet that opens above a main stream inlet to face an upright plate and is connected to a side flame inlet (see, for example, Patent Document 1). In addition, in this device, a plurality of main communication ports that match the main stream inlets of each burner and side fire communication ports that match the side fire inlets of each burner are formed on the upright plate, each corresponding to a plurality of burners. An air conditioning plate is attached to the front surface of the upright plate, in which a plurality of main vents facing the main communication port and a plurality of side fire vents facing the side fire communication port are formed, each corresponding to a plurality of burners. Furthermore, a main nozzle that injects fuel gas from the front toward the main stream inlet of each burner and a side flame nozzle that injects fuel gas from the front toward the side flame inlet of each burner are provided on the rear surface of the gas manifold. Multiple protrusions are provided to accommodate multiple burners.

By the way, the opening area of the side fire inlet is small, and the side fire vent of the air conditioning plate corresponding to the side fire inlet also has a small opening area, which is close to the area of the tip surface of the side fire nozzle. Therefore, the amount of primary air flowing from the primary air chamber through the side fire vent and into the side fire inlet varies greatly depending on the distance between the tip surface of the side fire nozzle and the air conditioning plate.

Conventionally, commonly used gas manifolds are made of die-casting, and the protruding height of the main nozzle and side nozzle can be accurately controlled, as well as the distance between the tip of the side nozzle and the air conditioning plate. can be managed. However, die-cast gas manifolds are expensive. Therefore, in order to reduce costs, it has been considered to make the gas manifold made of sheet metal.

Here, in a gas manifold made of sheet metal, the main nozzle and the side nozzle are drawn and formed, which causes the following problems. In other words, the dimensional accuracy of the protruding height of the drawn main nozzle and side nozzle is inferior to that of die-cast ones, and the distance between the tip of the side nozzle and the air conditioning plate tends to vary. . Then, the distance between the tip end surface of the flare nozzle and the air conditioning plate becomes short, and the amount of primary air flowing into the flare inlet may become insufficient.

Japanese Patent Application Publication No. 2000-283462

In view of the above points, the present invention manages the distance between the end face of the side nozzle and the air conditioning plate to a constant value, even though a gas manifold made of sheet metal is used. The object is to provide a combustion device that can prevent a shortage of primary air flowing into the combustion chamber.

In order to solve the above problems, the present invention includes a combustion case, and a partition plate is provided inside the combustion case to partition the space inside the combustion case into a combustion chamber and an air supply chamber below the combustion chamber. A plurality of longitudinally longitudinal burners are arranged in parallel in the horizontal direction in the chamber, and an upright plate is provided that rises from the front end of the partition plate along the lower front ends of the plurality of burners. A combustion device is provided with a gas manifold that defines a primary air chamber communicating with an air supply chamber between the burner and the gas supply chamber, and each burner has a lean air-fuel mixture having a leaner fuel concentration than the stoichiometric air-fuel ratio at its upper end. It has a main flame port that ejects, and side flame port portions that eject a rich air-fuel mixture with a higher fuel concentration than the stoichiometric air-fuel ratio and are located on both sides of the main flame port in the lateral direction. A light and shade device having a main stream inlet that opens to face the plate and is connected to the main flame port, and a side flame inlet that opens to face the upright plate above the main stream inlet and is connected to the side flame port. A plurality of main communication ports that match the main stream inlets of each burner and side fire communication ports that match the side fire inlets of each burner are formed in the upright plate, each corresponding to a plurality of burners, An air conditioning plate is attached to the front of the upright plate, which has a plurality of main vents facing the main communication port and side fire vents facing the side fire communication port, each corresponding to a plurality of burners. On the rear side, there is a main nozzle that injects fuel gas from the front toward the mainstream inlet of each burner, and a side nozzle that injects fuel gas from the front toward the side flame inlet of each burner, each corresponding to multiple burners. Furthermore, in the case where the gas manifold is made of sheet metal and the main nozzle and the side nozzle are drawn, a gas manifold is provided at the front in a part of the periphery of the side fire vent of the air conditioning board. It is characterized by being provided with a positioning protrusion that protrudes and comes into contact with the tip end surface of the nozzle.

According to the present invention, even though a gas manifold made of sheet metal is used, by bringing the protrusion provided on the air conditioning plate into contact with the tip surface of the side nozzle, the air It is possible to maintain a constant distance between the control plate and the adjustment plate. Therefore, it is possible to prevent a shortage in the amount of primary air flowing into the flare inlet due to a shortening of the distance between the tip surface of the flare nozzle and the air conditioning plate.

By the way, primary air flows in the primary air chamber from the bottom, which is the air supply chamber side, to the top. Therefore, in the present invention, it is desirable that the projecting portion be provided in the upper peripheral portion of the side fire vent. According to this, the flow of primary air toward the side fire vent is not obstructed by the projecting portion.

Further, in the present invention, it is preferable that the tip end surface of the flame nozzle is formed so that the abutting portion of the projecting portion expands outward with respect to a circle centered on the nozzle hole from which fuel gas is jetted. According to this, it is possible to sufficiently secure a space for the projecting portion to come into contact with the tip end surface of the fire nozzle.

FIG. 1 is a cutaway side view of a combustion device according to an embodiment of the present invention. FIG. 3 is an enlarged sectional view of the upper part of the burner provided in the combustion device of the embodiment. FIG. 2 is a perspective view of a part of the air conditioning plate provided in the combustion device of the embodiment, as seen diagonally from below. FIG. 2 is a perspective view of a part of the gas manifold provided in the combustion device of the embodiment, as seen diagonally from below.

Referring to FIG. 1, a combustion device according to an embodiment of the present invention includes a combustion case 1. As shown in FIG. A partition plate 2 is provided inside the combustion case 1 to partition the space inside the combustion case 1 into a combustion chamber 1a and an air supply chamber 1b below the combustion chamber 1a. In the combustion chamber 1a, a plurality of burners 3 elongated in the front-rear direction are arranged in parallel in the horizontal direction (direction perpendicular to the plane of the paper in FIG. 1). A combustion fan (not shown) is connected to the bottom of the air supply chamber 1b. Air supplied from the combustion fan to the air supply chamber 1b is supplied as secondary air to the combustion chamber 1a through a large number of distribution holes 21 formed in the partition plate 2. Further, an upright plate 22 is provided that rises from the front end of the partition plate 2 along the lower front ends of the plurality of burners 3. At the upper end of the upright plate 22, an upper plate part 22a is bent forward and reaches the lower end of the front plate part 11 at the upper front surface of the combustion casing 1.

As shown in FIG. 2, each burner 3 has a main flame port 31 elongated in the front-rear direction that ejects a lean mixture with a fuel concentration lower than the stoichiometric air-fuel ratio, and a main flame port 31 with a fuel concentration lower than the stoichiometric air-fuel ratio, as shown in FIG. It is constituted by a concentrated burner having side flame openings 32, 32 located on both laterally outer sides of a main flame opening 31, which ejects a rich and concentrated air-fuel mixture. A plurality of rectifying plates 31a are installed inside the main flame port 31, and are further positioned between the side flame ports 32 on both sides of the main flame port 31 in the lateral direction, so that air-fuel mixture is blown out. A recirculation area 31b is provided in which the water does not flow. Furthermore, each burner 3 has a main stream inlet 33 connected to the main flame port 31 that opens at the front end of the lower part so as to face the upright plate 22 , and an upper side of the main stream inlet 33 that faces the upright plate 22 . It has a sleeve flame inlet 34 that is open and connected to the sleeve flame port 32. Then, a lean air-fuel mixture generated by mixing the fuel gas flowing in from the main stream inlet 33 and the primary air is supplied to the main flame port 31, and a light mixture is generated by mixing the fuel gas flowing in from the side flame inlet 34 and the primary air. A relatively small amount of the generated rich air-fuel mixture is supplied to the side flame port 32.

The upright plate 22 has a main communication port 23 that matches the main stream inlet 33 of each burner 3, and a side fire communication port 24 that matches the side fire inlet 34 of each burner 3, each corresponding to a plurality of burners 3. Multiple formations. An air conditioning plate 4 is attached to the front surface of the upright plate 22. As shown in FIG. 3, the air conditioning plate 4 has a plurality of main vents 41 facing the main communication port 23 and a plurality of side fire vents 42 facing the side fire communication port 24, each corresponding to a plurality of burners 3. has been done.

The combustion device is further provided with a gas manifold 5 located in front of the upright plate 22 and defining a primary air chamber 1c communicating with the air supply chamber 1b between the upright plate 22 and the upright plate 22. On the rear surface of the gas manifold 5, as shown in FIG. A plurality of flare nozzles 52 for injecting fuel gas are provided in a protruding manner, each corresponding to a plurality of burners 3.

Here, the gas manifold 5 is made of sheet metal and includes a rear nozzle plate 5a and a front cover plate 5c defining a gas distribution chamber 5b between the nozzle plate 5a. The main nozzle 51 and the side nozzle 52 are drawn and formed on the nozzle plate 5a. Nozzle holes 51b and 52b from which fuel gas is ejected are formed in the tip surfaces 51a and 52a of the main nozzle 51 and the side nozzle 52, respectively.

By the way, the opening area of the opening area of the opening area of the opening area of the opening area of the opening area of the opening area of the opening area of the opening area of the opening area of the opening area of the opening area of the opening area of the opening area of the opening area of the opening area of the opening area of the opening area of the opening area of the opening area of the opening area of the opening area of the opening area of the opening area of the opening area of the opening area of the opening area of the opening area of the opening area of the opening area of the opening area of the opening area of the opening area of the opening area of the opening area of the opening area of the opening area of the opening area of the opening area of the opening area of the opening area of the opening area of the opening area of the opening area of the opening area of the opening area of the opening area of the opening area of the opening area of the opening area of the opening area of the opening area of the opening area of the opening area of the opening area of the opening area of the opening area of the opening opening 42 of the air conditioning board 4 that corresponds to the opening opening 34 is also small. close. Therefore, primary air hardly flows into the side fire vent 42 by bypassing around the side fire nozzle 52, and air is vented from the gap between the tip surface 52a of the side fire nozzle 52 and the air conditioning plate 4. Primary air flows into the port 42 . Therefore, the amount of primary air flowing from the primary air chamber 1c through the flare inlet 42 to the flare inlet 34 varies greatly depending on the distance between the tip surface 52a of the flare nozzle 52 and the air conditioning plate 4. As described above, when the main nozzle 51 and the side fire nozzle 52 are drawn, the dimensional accuracy of the protruding height of the main nozzle 51 and the side fire nozzle 52 becomes worse than that of die-casting, and the tip surface of the side fire nozzle 52 The distance between the air conditioning plate 52a and the air conditioning plate 4 tends to vary. Here, the flow path extending rearward from the armhole inlet 34 has a small cross-sectional area and high internal pressure, similar to the armature inlet 34. Therefore, in order to prevent the fuel gas from overflowing from the side fire inlet 34, it is necessary to bring the tip surface 52a of the side fire nozzle 52 close to the air conditioning plate 4 to some extent. However, if the gas manifold 5 made of sheet metal is used, the distance between the tip surface 52a of the side nozzle 52 and the air conditioning plate 4 tends to vary as described above. If the air conditioning plate 4 is brought close to the air conditioning plate 4, the above distance becomes too short, and there is a risk that the amount of primary air flowing into the armhole inlet 34 will be insufficient. In addition, if the gas manifold 5 is made of sheet metal, the area of the tip end surface 52a of the side fire nozzle 52 will be larger due to processing compared to one made of die-casting. Therefore, when the distance between the tip end surface 52a of the flame nozzle 52 and the air conditioning plate 4 becomes short, there is a possibility that the primary air amount shortage becomes more noticeable.

Therefore, in the present embodiment, a positioning projecting portion 43 is provided in a part of the periphery of the side fire vent 42 of the air conditioning plate 4 so as to project forward and come into contact with the tip end surface 52a of the side fire nozzle 52. According to this, the distance between the tip surface 52a of the flame nozzle 52 and the air conditioning plate 4 can be controlled to be constant by the projecting portion 43. Therefore, it is possible to prevent the amount of primary air flowing into the flasher inlet 34 from being insufficient due to the shortening of the distance between the tip surface 52a of the flasher nozzle 52 and the air conditioning plate 4.

Further, in this embodiment, the projecting portion 43 is provided in the upper peripheral portion of the side fire vent 42 . More specifically, a portion between the upper edge of the side fire vent 42 and the upper edge of the air conditioning plate 4 is made to protrude forward in a trapezoidal shape in plan view, thereby forming the protruding portion 43. Here, primary air flows into the primary air chamber 1c from the lower side, which is the air supply chamber 1b side, toward the upper side. If the projecting portion 43 is provided in the upper peripheral portion of the side vent 42 as in this embodiment, the flow of primary air from below toward the side vent 42 will not be obstructed by the projecting portion 43. , is advantageous.

Furthermore, in this embodiment, the tip surface 52a of the flame nozzle 52 is formed such that the abutting portion of the projecting portion 43 spreads outward, that is, upward, with respect to a circle centered on the nozzle hole 52b. . More specifically, as clearly shown in FIG. 4, the distal end surface 52a of the flame nozzle 52 is expanded so that the upper part, which is the abutting part of the projecting part 43, is expanded upward with respect to a circle centered on the nozzle hole 52b. It is formed into an oval shape. According to this, it is possible to secure a sufficient space for the overhanging portion 43 to come into contact with the tip end surface 52a of the flame nozzle 52, which is advantageous.

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 embodiment described above, the overhanging portion 43 is formed on the air conditioning plate 4 so as to reach the upper edge of the armpit vent 42, but there is a bulging portion at a location away from the upper edge of the armpit vent 42. The projecting portion 43 may be formed by cutting and raising.

1... Combustion case, 1a... Combustion chamber, 1b... Air supply chamber, 1c... Primary air chamber, 2... Partition plate, 22... Upright plate, 23... Main communication port, 24... Side fire communication port, 3... Burner, 31 ... Main flame opening part, 32... Side flame opening part, 33... Main stream inlet, 34... Side flame inlet, 4... Air conditioning board, 41... Main vent, 42... Side flame vent, 43... Overhang part, 5 ...Gas manifold, 51...Main nozzle, 52...Side fire nozzle.

Claims (3)

A combustion chamber is provided, and a partition plate is provided in the combustion chamber to partition the space inside the combustion chamber into a combustion chamber and an air supply chamber below the combustion chamber. A plurality of stand-up plates are arranged in parallel on the partition plate and stand up from the front end of the partition plate along the lower front ends of the plurality of burners. A combustion device including a gas manifold defining a chamber,
Each burner has a main flame port at its upper end that ejects a lean mixture with a fuel concentration leaner than the stoichiometric air-fuel ratio, and a main flame port that ejects a rich mixture with a fuel concentration higher than the stoichiometric air-fuel ratio. It has sleeve flame openings located on both sides in the lateral direction, and a main stream inlet that opens at the lower front end so as to face the upright plate and is connected to the main flame opening, and faces the upright plate above the main stream inlet. Consisting of a light/dark burner having a sleeve flame inlet connected to a sleeve flame inlet that opens in such a manner,
The upright plate is formed with a plurality of main communication ports that match the main stream inlets of each burner, and a plurality of side fire communication ports that match the side fire inlets of each burner, each corresponding to a plurality of burners. , an air conditioning board is installed in which a plurality of main vents facing the main communication port and a plurality of side fire vents facing the side fire communication port are formed corresponding to a plurality of burners, respectively;
On the rear surface of the gas manifold, there are a plurality of main nozzles that inject fuel gas from the front toward the mainstream inlet of each burner, and a plurality of side nozzles that inject fuel gas from the front toward the side flame inlet of each burner. A plurality of gas manifolds are provided corresponding to the burners, and the gas manifold is made of sheet metal, and the main nozzle and the side nozzle are formed by drawing.
A combustion device characterized in that a part of the periphery of a side fire vent of an air conditioning board is provided with a positioning projecting portion that projects forward and comes into contact with a tip end surface of a side fire nozzle. The combustion apparatus according to claim 1, wherein the projecting portion is provided in an upper peripheral portion of the side fire vent. 2. The tip surface of the flame nozzle is formed such that the contact portion of the projecting portion expands outward with respect to a circle centered on a nozzle hole through which fuel gas is ejected. 2. The combustion device according to 2.

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