Fire grate and combustor

Abstract

The utility model relates to the technical field of gas water heaters, in particular to a fire grate and a burner. Gas channels and air channels which are not communicated with each other are arranged in the fire grate in a staggered mode in the width direction, and the air channels are arranged on the two sides of each gas channel. The top end of the fire grate is provided with communicated air outlet holes corresponding to each air channel, and the top end of the fire grate is provided with a plurality of fire holes corresponding to each fuel gas channel along the length direction; every two adjacent fire holes are arranged in a staggered mode in the length direction of the fire row. Fuel gas sprayed out of the fire holes and air flowing out of the air outlet holes in the two sides are mixed in a crossed mode, meanwhile, the multiple fire holes are formed in the length direction in a staggered mode, the contact area of the fuel gas at the fire holes and the air is further increased, the mixing effect of the fuel gas and the air is improved, the combustion time of the fuel gas is shortened, and the combustion efficiency and the combustion stability are improved.

Description

Technical Field

[0001] The utility model relates to the technical field of gas water heaters, in particular to a fire grate and a burner. Background Art

[0002] At present, some of the gases used have the following characteristics: 1) low ignition energy and are very easy to ignite; 2) high combustion speed, concentrated combustion area, and short flame; 3) very high flame propagation speed of premixed combustion, and prominent flashback problem during low-load operation. Therefore, the above-mentioned gases are usually burned in the burner in a post-premixed combustion mode to solve the flashback problem, but there are still combustion problems such as the inability to mix the gas and air in time and evenly, and the mixing effect is poor, which leads to low combustion efficiency and unstable combustion. Utility Model Content

[0003] One of the technical problems solved by the utility model is to provide a fire grate, which can effectively solve the technical problem in the prior art that the mixing effect of the gas in the post-premixing method is poor, resulting in low combustion efficiency and unstable combustion.

[0004] The second technical problem solved by the utility model is to provide a burner which can effectively solve the technical problem in the prior art that the mixing effect of the gas using the post-premixing method is poor, resulting in low combustion efficiency and unstable combustion.

[0005] The first technical problem mentioned above is solved by the following technical solution:

[0006] A fire grate, wherein non-interconnected gas channels and air channels are staggered inside the fire grate along the width direction, and the air channels are arranged on both sides of each of the gas channels; a connected air outlet is arranged at the top of the fire grate corresponding to each of the air channels, and a plurality of fire holes are arranged at the top of the fire grate corresponding to each of the gas channels along the length direction; two adjacent fire holes are staggered along the length direction of the fire grate.

[0007] Compared with the background technology, the fire grate of the utility model has the following beneficial effects:

[0008] This fire grate is suitable for gas with low ignition energy, easy to ignite, and fast burning speed. Since the gas channel and the air channel are not connected to each other, the gas flows out of the fire hole and is premixed with the air, thereby avoiding backfire. The gas ejected from the fire hole is cross-mixed with the air flowing out of the air outlet holes on both sides. At the same time, the two adjacent fire holes corresponding to the same gas channel are staggered along the length direction of the fire grate, further increasing the contact area between the gas at the fire hole and the air flowing out of the air outlet holes, thereby improving the mixing effect of gas and air, reducing excessive load concentration, avoiding the occurrence of local high-temperature combustion areas, reducing the combustion time of gas, improving combustion efficiency and combustion stability, and avoiding the combustion problem of backfire leading to deflagration or detonation.

[0009] In one embodiment, the plurality of fire holes include at least a left fire hole and a right fire hole staggered along the length direction, the left fire hole is inclined toward the left side in the width direction, and the right fire hole is inclined toward the right side in the width direction.

[0010] In one of the embodiments, the included angle between the left fire hole and the right fire hole is 50° to 70°.

[0011] In one of the embodiments, along the length direction of the fire bar, a middle fire hole is arranged between the adjacent left fire holes and the right fire holes, and the middle fire hole is arranged vertically.

[0012] In one embodiment, the length of the middle fire hole is shorter than the lengths of the left fire hole and the right fire hole.

[0013] In one embodiment, the fire holes extend along the length direction of the fire bar.

[0014] In one embodiment, each of the air outlets is provided with a spoiler structure.

[0015] In one embodiment, the fire grate comprises an inner shell and an outer shell, the inner shell is provided with the gas channel, and the top of the inner shell is provided with a plurality of fire holes staggered along the length direction;

[0016] The outer shell is sleeved on the inner shell and forms two air passages with the inner shell. The top of the outer shell and the top of the inner shell side wall form the air outlet. The top of the outer shell is provided with a spoiler convex bulge protruding toward the inner shell to form the spoiler structure.

[0017] In one of the embodiments, the outer shell includes two enclosures arranged opposite to each other along the width direction, and the top of the enclosure has the spoiler convex; the spoiler convex of the enclosure located on the left side of the inner shell along the width direction is arranged one by one opposite to the right fire hole, and the spoiler convex of the enclosure located on the right side of the inner shell along the width direction is arranged one by one opposite to the left fire hole.

[0018] In one of the embodiments, a guide flange extending obliquely upward toward the inner shell is provided at the top end of the outer shell.

[0019] In one of the embodiments, both side walls of the inner shell along the width direction are provided with a first convex bump protruding outwards, and both inner side walls of the outer shell are provided with a second convex bump protruding outwards.

[0020] The above second technical problem is solved by the following technical solution:

[0021] The burner comprises a main shell and a plurality of the above-mentioned fire bars, wherein the plurality of the fire bars are arranged in the main shell at intervals along the width direction.

[0022] Compared with the background technology, the burner described in the utility model has the following beneficial effects:

[0023] This fire grate is suitable for gas with low ignition energy, easy to ignite, and fast burning speed. Since the gas channel and the air channel are not connected to each other, the gas flows out of the fire hole and is premixed with the air, thereby avoiding backfire. The gas ejected from the fire hole is cross-mixed with the air flowing out of the air outlet holes on both sides. At the same time, the two adjacent fire holes corresponding to the same gas channel are staggered along the length direction of the fire grate, further increasing the contact area between the gas at the fire hole and the air flowing out of the air outlet holes, thereby improving the mixing effect of gas and air, reducing excessive load concentration, avoiding the occurrence of local high-temperature combustion areas, reducing the combustion time of gas, improving combustion efficiency and combustion stability, and avoiding the combustion problem of backfire leading to deflagration or detonation. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 It is a structural schematic diagram of the fire grate provided by the embodiment of the utility model;

[0025] Figure 2 It is a top view of the fire bar provided by the embodiment of the utility model;

[0026] Figure 3 It is a schematic diagram of the structure of the inner shell provided by an embodiment of the utility model;

[0027] Figure 4 It is a schematic diagram of the structural decomposition of the fire grate provided in the embodiment of the utility model;

[0028] Figure 5It is a schematic diagram of the flow trajectory of gas and air at the left fire hole provided by an embodiment of the utility model;

[0029] Figure 6 It is a schematic diagram of the flow trajectory of gas and air at the right fire hole provided by the embodiment of the utility model;

[0030] Figure 7 It is a schematic diagram of the flow trajectory of gas and air at the middle fire hole provided in an embodiment of the utility model.

[0031] The names and numbers of the components in the figure are as follows:

[0032] 10, gas channel; 20, air channel; 30, fire hole; 301, left fire hole; 302, right fire hole; 303, middle fire hole; 40, air outlet;

[0033] 1. inner shell; 11. ejection hole; 12. first convex hull; 13. flow-blocking convex hull;

[0034] 2. Shell; 21. Enclosure; 211. Spoiler convex hull; 212. Guide flange; 213. Second convex hull. DETAILED DESCRIPTION

[0035] In order to make the technical problems solved by the present invention, the technical solutions adopted and the technical effects achieved clearer, the technical solutions of the present invention are further described below in conjunction with the accompanying drawings and through specific implementation methods. It is understood that the specific embodiments described herein are only used to explain the present invention, rather than to limit the present invention. It should also be noted that, for the convenience of description, only the parts related to the present invention are shown in the accompanying drawings, rather than all of them.

[0036] In the description of the present invention, unless otherwise clearly specified and limited, the terms "connected", "connected", and "fixed" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0037] In the description of this embodiment, the terms "upper", "lower", "right", "left" and other directions or positional relationships are based on the directions or positional relationships shown in the drawings, and are only for the convenience of description and simplified operation, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as a limitation of the present invention. In addition, the terms "first" and "second" are only used to distinguish in the description and have no special meaning.

[0038] The technical solution of the utility model is further explained below with reference to the accompanying drawings and through specific implementation methods.

[0039] This embodiment provides a burner, which is used in a gas water heater and other equipment. Specifically, the burner includes a main housing and a plurality of fire bars, which are arranged in the main housing at intervals along the width direction. The gas is mixed with air at the fire holes of the fire bars by post-premixing and then burns to generate high-temperature flue gas to heat water flowing through a heat exchanger.

[0040] At present, some of the fuel gases used have the following combustion characteristics: low ignition energy, very easy to ignite; high combustion speed, concentrated combustion area, short flame; very high flame propagation speed of premixed combustion, prominent flashback problem during low-load operation; low energy radiation rate of the flame to the furnace tube, resulting in localized heat accumulation at the burner outlet, very high flue gas temperature, and uneven temperature distribution in the furnace. Therefore, the above-mentioned fuel gases are burned in the burner in a post-premixing manner, which easily leads to the failure of the fuel gas and air to mix evenly in time, resulting in poor mixing effect, which leads to combustion problems such as low combustion efficiency and unstable combustion.

[0041] To solve the above problems, Figure 1 to Figure 5 As shown, this embodiment also proposes a fire grate, wherein the fire grate is provided with gas channels 10 and air channels 20 that are not connected to each other in an alternating manner along the width direction (left-right direction in the figure), and air channels 20 are provided on both sides of each gas channel 10. A connected air outlet 40 is provided at the top of the fire grate corresponding to each air channel 20, and a plurality of fire holes 30 are provided at the top of the fire grate corresponding to each gas channel 10 along the length direction (front-back direction in the figure), and two adjacent fire holes 30 are staggered along the length direction of the fire grate, and each fire hole 30 extends along the length direction of the fire grate. The air in the air channel 20 flows out through the air outlet 40, so that the gas ejected from the fire hole 30 is cross-mixed with the air flowing out of the air outlet holes 40 on both sides. At the same time, the two adjacent fire holes 30 corresponding to the same gas channel 10 are staggered along the length direction of the fire row, which further increases the contact area between the gas at the fire hole 30 and the air flowing out of the air outlet 40, thereby improving the mixing effect of the gas and air, reducing excessive load concentration, avoiding the occurrence of local high-temperature combustion areas, reducing the combustion time of the gas, improving the combustion efficiency and combustion stability, and avoiding the combustion problem of backfire leading to deflagration or detonation.

[0042] In one embodiment, if Figure 2 and Figure 3As shown, the plurality of fire holes 30 at least include a left fire hole 301 and a right fire hole 302 staggered along the length direction, the left fire hole 301 is tilted toward the left side in the width direction, and the right fire hole 302 is tilted toward the right side in the width direction. The staggered left fire hole 301 and the right fire hole 302 increase the contact surface between the fire hole 30 and the air at the left and right air outlets 40, thereby improving the cross-mixing effect of the gas and the air.

[0043] It should be noted that the angle between the left fire hole 301 and the right fire hole 302 is 50° to 70°, so that the left fire hole 301 and the right fire hole 302 have a suitable inclination angle, which can reduce the processing difficulty of the left fire hole 301 and the right fire hole 302 while ensuring a large contact area with the air. If the inclination angle of the left fire hole 301 and the right fire hole 302 is too large, the processing difficulty and processing cost of the fire hole 30 are increased. If the inclination angle of the left fire hole 301 and the right fire hole 302 is too small, the mixing effect of the gas in the fire hole 30 and the air at the outlet 40 is not significantly improved.

[0044] Specifically, Figure 3 As shown, a middle fire hole 303 is provided between the adjacent left fire hole 301 and right fire hole 302. The left fire hole 301, the middle fire hole 303 and the right fire hole 302 are staggered along the length direction, and the left fire hole 301 is located on the left side of the middle fire hole 303, the right fire hole 302 is located on the right side of the middle fire hole 303, and the middle fire hole 303 is vertically arranged. The fire holes 30 of this embodiment have three types: the left fire hole 301, the middle fire hole 303 and the right fire hole 302. In other embodiments, the fire holes 30 may also have other inclination angles, and the fire holes 30 with different inclination angles are staggered along the length direction.

[0045] In one embodiment, the length of the middle fire hole 303 is shorter than that of the left fire hole 301 and the right fire hole 302. Since the left fire hole 301 and the right fire hole 302 also have a turbulent effect on the air, so that the gas and air are mixed more evenly, the length of the middle fire hole 303 is set shorter than that of the left fire hole 301 and the right fire hole 302, so that the gas and air are fully mixed on the basis of ensuring uniform flame distribution.

[0046] In one embodiment, each air outlet 40 is provided with a turbulent structure to form turbulence in the air flowing through the air outlet 40. The turbulent structure causes the air near the fire hole 30 to produce a better turbulent effect, thereby enhancing the collision and mixing effect of air and gas.

[0047] In one embodiment, if Figure 4 and Figure 5As shown, the fire grate includes an inner shell 1 and an outer shell 2, wherein a gas channel 10 is provided inside the inner shell 1, and a plurality of fire holes 30 are staggered along the length direction at the top of the inner shell 1. The outer shell 2 is sleeved on the inner shell 1 and forms two air channels 20 with the inner shell 1. The top of the outer shell 2 and the top of the side wall of the inner shell 1 form an air outlet 40, and the top of the outer shell 2 is provided with a spoiler convex 211 protruding toward the inner shell 1 to form a spoiler structure. Specifically, the outer shell 2 includes two enclosures 21 arranged opposite to each other in the width direction, the inner shell 1 is sandwiched between the two enclosures 21, and the two side walls of the inner shell 1 in the width direction respectively form an air channel 20 with the corresponding enclosure 21, and by providing the spoiler convex 211, the air flowing out of the air outlet 40 on the left and right sides of the fire hole 30 has a turbulent effect, and a single-channel staggered mixed combustion mode of air (turbulence)-gas (staggered flow)-air (turbulence) is formed at the top of the fire grate.

[0048] Specifically, the inner shell 1 is formed by symmetrically fitting two left and right side panels of the same structure and forming a gas channel 10 inside. The edges of the two side panels of the inner shell 1 fit together to achieve a good seal of the gas channel 10. The edge of the inner shell 1 is closed and an injection hole 11 connected to the gas channel 10 is formed on the front side of the bottom. The gas entering from the injection hole 11 flows through the gas channel 10 to the fire hole 30 at the top of the fire grate, and finally the gas is fully mixed with air and then burned.

[0049] In one embodiment, if Figure 3 and Figure 4 As shown, at least one of the two side walls of the inner shell 1 along the width direction is provided with a flow-blocking convex 13 extending into the gas channel 10. By punching a flow-blocking groove on the two side walls of the inner shell 1, the flow-blocking groove is recessed toward the gas channel 10 and a flow-blocking convex 13 is formed in the gas channel 10, so that the gas is evenly diverted at the flow-blocking convex 13, ensuring the pressure balance inside the gas channel 10, so that the gas flows evenly to the fire hole 30 above. The two side walls of the inner shell 1 along the width direction of this embodiment are provided with a flow-blocking convex 13 to enhance the uniform flow effect of the gas in the gas channel 10. In other embodiments, a flow-blocking convex 13 can also be provided on any side wall of the inner shell 1.

[0050] In one embodiment, if Figure 4 and Figure 5As shown, the two side walls of the inner shell 1 along the width direction are both protruded outwardly with a first convex bump 12, and the two inner side walls of the outer shell 2 (i.e., the enclosure 21) are both protruded outwardly with a second convex bump 213. By providing the first convex bump 12 and the second convex bump 213, a turbulent flow result is formed in the air channel 20 in the fire grate, and the turbulent effect of the air formed in the air outlet 40 is further enhanced. At the same time, the top of the first convex bump 12 and the top of the second convex bump 213 are pressed against each other one by one. When the inner shell 1 and the outer shell 2 are assembled, the first convex bump 12 and the second convex bump 213 are pressed against each other to lock the relative position of the inner shell 1 and the outer shell 2, which can not only play a good positioning and limiting role, but also avoid the misalignment of the inner shell 1 and the outer shell 2. And it improves the connection strength between the inner shell 1 and the outer shell 2, thereby improving the overall structural stability of the fire grate. The left and right sides of the inner shell 1 of this embodiment are both provided with a plurality of first convex bumps 12 of equal height and equal spacing along the front and rear directions, and the two enclosures 21 are correspondingly provided with a plurality of second convex bumps 213 of equal height and equal spacing along the front and rear directions. It is understandable that the number, spacing and installation height of the first convex bumps 12 and the second convex bumps 213 can be flexibly adjusted according to needs.

[0051] like Figure 1 , Figure 5 and Figure 6 As shown, the top of each enclosing plate 21 has a spoiler convex hull 211 and the spoiler convex hull 211 on each enclosing plate 21 is staggered along the length direction, the spoiler convex hull 211 of the enclosing plate 21 located on the left side of the inner shell 1 along the width direction is arranged one by one opposite to the right fire hole 302, and the spoiler convex hull 211 of the enclosing plate 21 located on the right side of the inner shell 1 along the width direction is arranged one by one opposite to the left fire hole 301. Since the spoiler convex hull 211 of the left enclosing plate 21 is recessed toward the right fire hole 302, the part of the left air outlet 40 opposite to the right fire hole 302 is as close to the right fire hole 302 as possible, which is conducive to improving the mixing effect of the air at the left air outlet 40 and the gas at the right fire hole 302. Similarly, since the spoiler convex hull 211 of the right side panel 21 is recessed toward the left fire hole 301, the right side air outlet hole 40 directly opposite to the left fire hole 301 is as close to the left fire hole 301 as possible, which is beneficial to improve the mixing effect of the air at the right air outlet hole 40 and the gas at the left fire hole 301. It should be noted that there is a middle fire hole 303 between the side wall of the spoiler convex hull 211 of the left side panel 21 and the side wall of the adjacent spoiler convex hull 211 of the right side panel 21.

[0052] In one embodiment, Figure 1As shown, the top of the outer shell 2 is provided with a guide flange 212 that is inclined upward toward the inner shell 1. Specifically, the top of the enclosure 21 between two adjacent spoiler humps 211 and the top wall of the spoiler humps 211 are provided with a guide flange 212 that is inclined upward and extends toward the inner shell 1. By providing the guide flange 212, a single-channel staggered mixed combustion mode of air (turbulent orientation)-gas (offset flow)-air (turbulent orientation) is formed at the top of the fire grate. Specifically, the air of the two left and right air outlets 40 flows in a direction toward the fire hole 30 under the guidance of the guide flanges 212 of the two enclosures 21 (as shown in FIG. 2 ). Figures 4 to 6 As shown by the arrows, most of the air at the air outlet holes 40 on the left and right sides flows to the fire hole 30 in the middle position, thereby improving the mixing effect of gas and air and the combustion efficiency. Since the middle fire hole 303 extends in the length direction (i.e., is arranged vertically), the two side walls of the spoiler convex hull 211 do not need to be extended with guide flanges 212.

[0053] In one embodiment, the inclination angle α of the guide flange 212 relative to the height direction of the enclosure 21 is 10° to 20°. Specifically, the inclination angle α of the guide flange 212 can be 10°, 12°, 14°, 16°, 18° or 20°, etc. By setting the inclination angle α to the above value, the guide flange 212 guides most of the air to flow through the air outlet 40 to the fire hole 30 located in the middle position as much as possible. If the inclination angle α is too small, the guiding effect of the guide flange 212 is not obvious; if the inclination angle α is too large, the opening area of ​​the air outlet 40 will be reduced, which will have a certain blocking effect on the directional flow of air, which is not conducive to the supply of air.

[0054] like Figure 5 to Figure 7 As shown, the flow path of the gas in the fire grate is as follows: the gas is ejected from the nozzle of the gas distribution pipe assembly at a certain flow rate under the injection action of the gas distribution pipe assembly of the gas water heater (or wall-mounted boiler), and enters the gas channel 10 through the injection hole 11 of the inner shell 1 of the fire grate. Then, the gas is evenly divided after passing through the flow-blocking convex hull 13 in the gas channel 10, and evenly flows to the fire hole 30 at the top of the gas channel 10, so as to achieve uniform combustion of the gas.

[0055] The air flow path in the fire grate is: under the action of the fan assembly of the gas water heater, the air enters the left and right air channels 20 from the bottom of the burner from bottom to top. Figure 5As shown, at the left fire hole 301, the air from the left air outlet 40 generates turbulence effect under the action of the spoiler convex 211 of the left side panel 21, and at the same time, under the guidance of the guide flange 212 at the top of the left side panel 21, a directional turbulent flow is achieved toward the left fire hole 301. The air from the right air outlet 40 generates turbulence effect under the action of the spoiler convex 211 of the right side panel 21 and deviates closer to the left fire hole 301, and at the same time, under the guidance of the guide flange 212 at the top of the right side panel 21, a directional turbulent flow is achieved toward the left fire hole 301, so that the air from the air outlets 40 on both sides collides and mixes with the gas flowing out of the left fire hole 301 to burn. Figure 6 As shown, at the right ignition hole 302, the air of the right air outlet 40 generates turbulence effect under the action of the spoiler convex 211 of the right side panel 21, and at the same time, under the guidance of the guide flange 212 at the top of the right side panel 21, a directional turbulent flow is achieved toward the right ignition hole 302. The air of the left air outlet 40 generates turbulence effect under the action of the spoiler convex 211 of the left side panel 21 and deviates close to the right ignition hole 302, and at the same time, under the guidance of the guide flange 212 at the top of the left side panel 21, a directional turbulent flow is achieved toward the right ignition hole 302, so that the air of the air outlet 40 on both sides collides and mixes with the gas flowing out of the right ignition hole 302 to burn. Figure 7 As shown, at the center fire hole 303, the air of the left air outlet 40 generates turbulence effect under the action of the spoiler convex 211 of the left side enclosure 21, and the air of the right air outlet 40 generates turbulence effect under the action of the spoiler convex 211 of the right side enclosure 21, so that the air of the air outlet holes 40 on both sides collides and mixes with the gas flowing out of the center fire hole 303 to burn.

[0056] The above embodiments are only to illustrate the basic principles and characteristics of the present invention. The present invention is not limited by the above embodiments. Without departing from the spirit and scope of the present invention, the present invention may be subject to various changes and modifications, which are within the scope of the present invention. The scope of protection of the present invention is defined by the attached claims and their equivalents.

Claims

1. Fire row, characterized in that, The fire grate is provided with gas channels (10) and air channels (20) which are not connected to each other, staggered in the width direction, and each of the gas channels (10) is provided with the air channels (20) on both sides; the top of the fire grate is provided with a connected air outlet (40) corresponding to each of the air channels (20); the top of the fire grate is provided with a plurality of fire holes (30) corresponding to each of the gas channels (10) along the length direction; and two adjacent fire holes (30) are staggered along the length direction of the fire grate.

2. The fire bar according to claim 1, characterized in that: The plurality of fire holes (30) include at least a left fire hole (301) and a right fire hole (302) staggered along the length direction, wherein the left fire hole (301) is tilted toward the left side in the width direction, and the right fire hole (302) is tilted toward the right side in the width direction.

3. The fire bar according to claim 2, characterized in that: The included angle between the left fire hole (301) and the right fire hole (302) is 50° to 70°.

4. The fire bar according to claim 2, characterized in that: Along the length direction of the fire bar, a middle fire hole (303) is arranged between the adjacent left fire holes (301) and the right fire holes (302), and the middle fire hole (303) is arranged vertically.

5. The fire bar according to claim 4, characterized in that: The length of the middle fire hole (303) is shorter than the lengths of the left fire hole (301) and the right fire hole (302).

6. The fire bar according to claim 1, characterized in that: The fire holes (30) extend along the length direction of the fire row.

7. The fire bar according to claim 2 or 4, characterized in that: Each of the air outlet holes (40) is provided with a flow-disturbing structure.

8. The fire bar according to claim 7, characterized in that: The fire grate comprises an inner shell (1) and an outer shell (2); the inner shell (1) is provided with the gas channel (10); and the top end of the inner shell (1) is provided with a plurality of fire holes (30) staggered along the length direction; The outer shell (2) is sleeved on the inner shell (1) and forms two air passages (20) together with the inner shell (1); the top end of the outer shell (2) and the top end of the side wall of the inner shell (1) form the air outlet (40); the top end of the outer shell (2) is provided with a spoiler convex bump (211) protruding toward the inner shell (1) to form the spoiler structure.

9. The fire bar according to claim 8, characterized in that: The outer shell (2) comprises two enclosures (21) arranged opposite to each other along the width direction, and the top of the enclosure (21) has the spoiler convex hump (211); the spoiler convex hump (211) of the enclosure (21) located on the left side of the inner shell (1) along the width direction is arranged one by one opposite to the right ignition hole (302), and the spoiler convex hump (211) of the enclosure (21) located on the right side of the inner shell (1) along the width direction is arranged one by one opposite to the left ignition hole (301).

10. The fire bar according to claim 8, characterized in that: The top end of the outer shell (2) is provided with a guide flange (212) extending obliquely upwards towards the inner shell (1).

11. The fire bar according to claim 8, characterized in that: The two side walls of the inner shell (1) along the width direction are both provided with a first convex bump (12) protruding outwards, and the two inner side walls of the outer shell (2) are both provided with a second convex bump (213) protruding outwards.

12. A burner, characterized in that The utility model comprises a main shell and a plurality of fire bars according to any one of claims 1 to 11, wherein the plurality of fire bars are arranged in the main shell at intervals along a width direction.

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