TW202206747A - Combustion device capable of forming the branch pipe with one stamping process to a plate material to reduce the cost - Google Patents

Abstract

Provided is a combustion device, comprising: a plurality of burners (2) arranged side by side at the lower part in the combustion casing (1), a branch pipe (3) for supplying fuel gas to the burners (2), a heat exchanger (4) heated by combustion gas from the burners (2), and a fan for sucking the combustion gas passing through the heat exchanger (4). The branch pipe (3) is composed of a branch pipe body (3a) and a cover (3b). The branch pipe body is provided with a plurality of protruding nozzles for ejecting a fuel gas toward the inflow port (22) of the mixing pipe portion (21) of each burner (2). The cover (3b) partitions the distribution chamber (32) of the fuel gas between the branch pipe body (3a) and the cover (3b), so as to reduce the cost of the branch pipe (3). The solution is that the branch pipe body (3a) is formed by stamping of a plate material. Furthermore, the protruding height of the nozzle (31) is set to a height that can be press formed by one stamping process.

Description

burner

The present invention relates to a combustion device comprising: a combustion basket, a plurality of burners arranged side by side in a lower portion of the combustion basket, a branch pipe for supplying fuel gas to the plurality of burners, an upper portion of the combustion basket and a A heat exchanger heated by combustion gases from a burner.

Conventionally, in such a combustion apparatus, generally, an air supply chamber is provided below the burner installation portion of the combustion basket, and a fan is connected to the air supply chamber. Then, the air from the fan is supplied to the plurality of burners as combustion air through the air supply chamber (for example, refer to Patent Document 1). Moreover, in the front part of an air supply chamber, the inflow port of the mixing pipe part of each burner is connected, and the primary air chamber standing up is provided above. Furthermore, the branch pipe is installed in such a manner as to seal the primary air chamber.

Here, the branch pipe is composed of a branch pipe body and a cover, and the branch pipe body is formed by protruding a plurality of nozzles for ejecting fuel gas toward the inflow port of the mixing pipe portion of each burner corresponding to a plurality of burners. The shield is arranged to divide the distribution chamber of the fuel gas between the main bodies of the branch pipes. The branch pipe body also functions as a cover that seals the front surface of the primary air chamber, so it is necessary to ensure flatness. Therefore, conventionally, the branch pipe body is used as a die-cast product to ensure flatness. [Prior Art Literature] [Patent Literature]

[Patent Document 1] Japanese Patent Application Laid-Open No. 2019-2594

[Problems to be Solved by Invention]

However, the combustion apparatus is provided with a fan for sucking the combustion gas passing through the heat exchanger, and the combustion air is supplied to each burner by the suction force of the fan. In such a combustion device of the exhaust gas suction system, it is not necessary to seal the front surface of the primary air chamber with the branch pipe body. Therefore, it is also unnecessary to ensure the flatness of the branch pipe body.

In view of the above-mentioned viewpoints, the present invention aims to provide a combustion device of an exhaust gas suction system in which the main body of the branch pipe is not a die-cast product, thereby achieving cost reduction. [Technical means to solve problems]

In order to solve the above-mentioned problems, the present invention provides a combustion apparatus including a combustion basket, a plurality of burners arranged in parallel in a lower portion of the combustion basket, a branch pipe for supplying fuel gas to the burners, and a burner disposed in the combustion basket. The upper part is a heat exchanger heated by combustion gas from a burner, and a fan for sucking the combustion gas passing through the heat exchanger, and the combustion air is supplied to each burner by the suction force of the fan, and the characteristics are: Therefore, the branch pipe is composed of a branch pipe body and a cover, and the branch pipe body is provided in a plurality of protruding nozzles corresponding to the plurality of burners for injecting fuel gas toward the inflow port of the mixing pipe portion of each burner. , The shield is to divide the distribution chamber of the fuel gas between the branch pipe bodies. The branch pipe bodies are formed by stamping of the plate material. Extrusion height.

According to the present invention, the branch pipe body is formed by press working of a plate material, whereby cost reduction can be achieved as compared with the conventional example in which the branch pipe body is a die-cast product. In addition, in the present invention, the protruding height of the nozzle is set to a height that can be extruded by one press process, whereby the number of press processes can be reduced, and the cost can be reduced as much as possible.

In addition, if the branch pipe body is formed by pressing a plate material, it is difficult to ensure the flatness of the branch pipe body. However, since the object of the present invention is the exhaust gas suction type combustion device, there is no problem even if the flatness of the branch pipe body cannot be ensured.

However, during the distribution process of the combustion device, there is a case where the combustion device is dropped due to poor handling of the cargo. Even if the inside of the device is damaged due to falling, the members exposed on the outside of the device are strong and not deformed, and there is a possibility that the combustion device can be used as it is.

Here, the branch pipe generally has a fixed portion fixed to the combustion basket, and a fuel gas inflow portion located below the combustion basket. When the combustion device is dropped, a force (impact force) in a direction in which the fixed portion and the inflow portion are brought close to each other is applied to the branch pipe. Here, it is desirable to form a notch in the branch pipe, which becomes a stress concentration portion that concentrates the shear stress when a force in a direction in which the fixing portion and the inflow portion are brought close to each other is applied. Thereby, when the combustion device falls, the branch pipe is easily deformed and broken in the notch. Thus, it may be facilitated to note that the combustion device should not be used as such.

In addition, the side-by-side arrangement direction of the plurality of burners is the horizontal direction, the fixing portion is provided at the end portions of at least both sides of the branch pipe in the horizontal direction, and the notch is provided on the two sides in the horizontal direction rather than the center portion in the horizontal direction of the branch pipe. The position of the end is better. Thereby, the downward force applied to the fixing portion due to the falling of the combustion device can easily generate stress concentration in the cutout portion, and the reliability of deformation and breakage of the cutout portion at the time of falling can be increased.

In addition, it is preferable that the fixing portion is provided only at the end portions on both sides in the lateral direction of the branch pipe, and the inflow portion is provided at the center portion in the lateral direction of the branch pipe. As a result, stress concentration is more likely to occur in the notch portion due to the drop of the combustion device, and the reliability of deformation and breakage of the notch portion at the time of dropping can be further increased.

Referring to FIGS. 1 and 2 , a combustion apparatus according to an embodiment of the present invention includes a combustion basket 1 , a plurality of burners 2 arranged side by side in the lower part of the combustion basket 1 , and a burner 2 for supplying fuel gas to the burners 2 . The branch pipe 3 and the heat exchanger 4 are arranged in the upper part of the combustion basket 1 and heated by the combustion gas from the burner 2 .

The side-by-side arrangement direction of the burners 2 is the horizontal direction, and each burner 2 is a flat burner having an elongated burner portion at the upper end in the front-rear direction in the horizontal direction perpendicular to the horizontal direction. A mixing pipe portion 21 is provided at the lower portion of each burner 2 . The front end of the mixing pipe portion 21 is provided with an inflow port 22 that is opened in the front. Then, the fuel gas ejected from each nozzle 31 to be described later in the branch pipe 3 flows into the inflow port 22 of each burner 2 , and the primary air flows into the inflow port 22 , and mixing of the fuel gas and the primary air occurs in the mixing pipe portion 21 . The air-fuel mixture is ejected from the burner portion of the burner 2 and combusted.

Referring also to FIG. 3 , in the front part of the bottom plate 11 of the combustion basket 1 , a height difference part 111 erected above is formed. The height difference portion 111 is provided with an opening 112 facing the inflow port 22 of the mixing pipe portion 21 of each burner 2 . In this embodiment, six burners 2 are arranged side by side, so six openings 112 are arranged side by side in the lateral direction. Moreover, the bottom plate 11 sandwiches the lower edge of each burner 2 from both sides in the lateral direction, and a plurality of depressions 113 upward are formed. Furthermore, electrode parts 5 including ignition electrodes 51 for igniting the burner 2 and a rod 52 for detecting the flame of the burner 2 are attached to the front plate 12 of the combustion basket 1 .

The heat exchanger 4 is composed of a fin-and-tube heat exchanger, and includes a plurality of heat-absorbing fins 41 stacked in the lateral direction, and a plurality of heat-absorbing tubes 42 penetrating the heat-absorbing fins 41 . The heat absorbing pipes 42 are connected in series by a plurality of connecting pipes 43 bent in a U-shape on the outer surface of the upper part of the combustion basket 1 . Furthermore, the water supply pipe 44 is connected to the heat absorption pipe 42 at the upstream end, and the water outlet pipe 45 is connected to the heat absorption pipe 42 at the downstream end.

A fan 7 is connected to the upper end of the combustion basket 1 through the exhaust hood 6 . A fan motor 71 is attached to the fan 7 . The combustion gas passing through the heat exchanger 4 is sucked by the fan 7 . The combustion gas sucked by the fan 7 is discharged to the outside through an exhaust pipe (not shown) connected to the outlet 72 of the fan 7 . Furthermore, as shown in FIG. 3 , a plurality of small holes 114 are formed in the bottom plate 11 of the combustion basket 1 . Then, the combustion air is supplied to each burner 2 by the suction force of the fan 7 . That is, the air sucked from the inflow port 22 through each opening 112 is supplied to each burner 2 as primary air for combustion, and the air sucked from the small holes 114 is supplied to each burner 2 as secondary air for combustion. Burner 2.

On the lower front ends of the side plates 13 on both sides in the lateral direction of the combustion basket 1 , there are provided tongue pieces 131 that protrude further forward than the level difference 111 of the bottom plate 11 . In addition, the branch pipe 3 is fixed to the tongue piece 131 with screws 34a at the fixing parts 34 provided at the ends on both sides in the lateral direction.

4 to 6 , the branch pipe 3 is composed of a branch pipe body 3a and a cover 3b. The branch pipe body 3a is used to eject the fuel gas toward the inflow port 22 of the mixing pipe portion 21 of each burner 2 A plurality of nozzles 31 (six in the present embodiment) are protrudingly provided corresponding to the plurality of burners 2, and the shield 3b partitions the distribution chamber 32 of the fuel gas between the branch pipe bodies 3a. The shield 3b is seam-welded to the branch pipe main body 3a at its peripheral edge. The branch pipe 3 further has an inflow port 33 which is an inflow portion of the fuel gas located below the combustion basket 1 . The above-mentioned fixing portion 34 and the inflow port 33 are provided in the branch pipe main body 3a. The fuel gas flows into the inflow port 33 through the valve unit 8 connected thereto. Then, the fuel gas flowing in from the inflow port 33 passes through the distribution chamber 32 and distributes the nozzles 31 , and is ejected from the nozzles 31 toward the inflow port 22 of the mixing pipe portion 21 of each burner 2 .

Here, as in the present embodiment, the exhaust suction type combustion apparatus including the fan 7 that sucks the combustion gas passing through the heat exchanger 4 does not need to ensure the flatness of the branch pipe main body 3a as described above. Therefore, in this embodiment, the branch pipe main body 3a is formed by press working of a plate material such as a stainless plate. Thereby, compared with the conventional example which made the branch pipe main body 3a into a die-cast product, cost reduction can be aimed at. In addition, in the present embodiment, the mask 3b is formed by pressing a plate material thinner than the material of the branch pipe main body 3a.

In addition, in this embodiment, the protrusion height H (refer FIG. 6) of the nozzle 31 is set to the height which can be extruded by one press working. For example, when the material of the branch pipe body 3a, ie, the plate material, is a stainless steel plate (SUS304) with a plate thickness of 1.2 mm, and the projection height H of the nozzle 31 is 4 mm, the nozzle 31 can be extruded by one pressing process. Furthermore, the cost of the nozzle 31 can be reduced as much as possible by extruding the nozzle 31 in one press process.

Here, as shown in FIG. 6 , each nozzle 31 includes: a cylindrical nozzle body 311 having an inner space 311a into which the fuel gas flows from the distribution chamber 32; The inflow side is the side opposite to the base end of the nozzle body 311 . The end wall portion 312 is formed with a nozzle hole 313 for ejecting the fuel gas flowing into the inner space 311 a of the nozzle body 311 . If the protruding height H of the nozzle 31 is made to be a relatively small value that can be extruded by one pressing process, the flow of the combustion gas in the inner space 311a of the nozzle body 311 is not sufficiently rectified, and the combustion performance is likely to become unstable, or It is the occurrence of so-called bad things such as flute sound. Here, in the present embodiment, the base portion of the nozzle hole 313 located on the inner space 311a side of the nozzle body 311 is provided with a tapered portion 313a that expands in diameter toward the inner space 311a of the nozzle body 311 . Accordingly, even if the flow of the fuel gas is not sufficiently rectified in the inner space 311a of the nozzle body 311, the flow of the fuel gas can be rectified by the tapered portion 313a of the nozzle hole 313, so that the combustion performance can be stabilized and the whistle sound can be suppressed. happened.

However, during the distribution process of the combustion device, there is a case where the combustion device is dropped due to poor handling of the cargo. Even if the inside of the device is damaged due to falling, the members exposed on the outside of the device are strong and not deformed, and there is a possibility that the combustion device can be used as it is.

Here, when the combustion device is dropped, a force (impact force) is applied to the branch pipe 3 in a direction in which the fixing portion 34 and the inflow port 33 are brought close to each other. Therefore, in the present embodiment, the notch 35 is formed in the branch pipe 3 , and the notch 35 becomes a stress concentration portion that concentrates the shearing stress when a force is applied in a direction in which the fixing portion 34 and the inflow port 33 are brought close to each other. Thereby, when the burner is dropped, the branch pipe 3 is easily deformed and broken at the notch 35, and it is possible to promote attention that the burner should not be used as it is.

In addition, when the fixing portion 34 is provided at at least the ends on both sides in the lateral direction of the branch pipe 3, the notch 35 is provided at a position closer to the ends on both sides in the lateral direction than the central portion in the lateral direction of the branch pipe 3 is as follows: good. Thereby, the downward force applied to the fixing portion 34 due to the falling of the combustion device can easily generate stress concentration in the notch 35, and the reliability of deformation and breakage of the notch 35 at the time of falling can be increased. In particular, in the present embodiment, the fixing portions 34 are provided only at the end portions on both sides in the lateral direction of the branch pipe body 3a, and the inflow port 33 is provided at the center portion in the lateral direction of the branch pipe body 3a. Further, a pair of upper and lower notches 35 are formed at positions closer to both ends in the lateral direction than the central portion in the lateral direction of the branch pipe body 3a. Thereby, it is easier to generate stress concentration in the notch 35 due to the falling of the combustion device, and the reliability of deformation and breakage of the notch 35 at the time of falling can be further increased.

As mentioned above, although embodiment of this invention was described with reference to drawings, this invention is not limited to this. For example, in the above-described embodiment, although the fixing portion 34 provided in the branch pipe body 3a protrudes laterally outward from the cover 3b, it may be provided at the end portions on both sides of the cover 3b in the lateral direction, and the fixed portion 34 may be provided in the branch. The fixed part where the fixed part 34 of the pipe body 3a is overlapped. In this case, the notches 35 may be formed in the vicinity of the end portions located on both sides in the lateral direction in both the branch pipe main body 3a and the cover 3b.

1: burning basket 2: Burner 21: Mixing tube section 22: Flow inlet 3: branch pipe 3a: branch pipe body 3b: Mask 31: Nozzle 32: Distribution Room 33: Inflow port (inflow part) 34: Fixed part 35: Notch 4: heat exchanger 7: Fan

1 is a perspective view of a combustion apparatus according to an embodiment of the present invention. [Fig. 2] A cut-away side view of Fig. 1 cut at II-II. [Fig. [ Fig. 3 ] A perspective view of the branch pipe of the combustion device of the embodiment viewed obliquely from below in a separated state. [ Fig. 4 ] A perspective view of a branch pipe included in the combustion apparatus of the embodiment viewed obliquely from the rear. [ Fig. 5] Fig. 5 is a perspective view of the branch pipe body and the cover of the branch pipe provided in the combustion apparatus according to the embodiment, as viewed obliquely from the front. [Fig. 6] An enlarged cross-sectional view of the nozzle portion cut along the line VI-VI of Fig. 4. [Fig.

1: burning basket

2: Burner

3: branch pipe

3a: branch pipe body

3b: Mask

4: heat exchanger

5: Electrode parts

6: Exhaust hood

8: Valve unit

11: Bottom plate

12: Front panel

21: Mixing tube section

22: Flow inlet

31: Nozzle

32: Distribution Room

33: Inflow port (inflow part)

41: Heat-absorbing fins

42: heat sink

52: rack rod

111: Height difference department

112: Opening

113: Sag

114: Small hole

131: tongue part

Claims (4)

A combustion device includes a combustion basket, a plurality of burners arranged side by side in a lower portion of the combustion basket, a branch pipe for supplying fuel gas to the burners, an upper portion of the combustion basket, and a A heat exchanger for heating the combustion gas from the heat exchanger, and a fan for sucking the combustion gas passing through the heat exchanger, and supplying combustion air to each burner by the suction force of the fan, are characterized by: The branch pipe is composed of a branch pipe body and a cover. The branch pipe body is arranged so that the nozzles that spray fuel gas toward the inflow port of the mixing pipe portion of each burner are protruded in plural corresponding to the plural burners. The shield is to divide the distribution chamber of the fuel gas between the main bodies of the branch pipes, The main body of the branch pipe is formed by stamping of a plate material, and the protruding height of each nozzle is set to a height that can be extruded by one stamping. The combustion apparatus according to claim 1, wherein the branch pipe has a fixed portion fixed to the combustion basket and a fuel gas inflow portion located below the combustion basket, and a notch is formed in the branch pipe, This is a stress concentration portion that concentrates the shear stress by applying a force in a direction in which the fixing portion and the inflow portion approach. The combustion device according to claim 2, wherein the side-by-side arrangement direction of the plurality of burners is the horizontal direction, the fixing portion is provided on at least both ends of the branch pipe in the horizontal direction, and the notch, It is provided in the position which is closer to the edge part on both sides in the horizontal direction than the center part in the horizontal direction of the branch pipe. The combustion device according to claim 3, wherein the fixing portion is provided only at the end portions on both sides in the lateral direction of the branch pipe, and the inflow portion is provided at the center portion in the lateral direction of the branch pipe.

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