Low-nitrogen combustor with environmental protection performance

Abstract

This application relates to an environmentally friendly low-NOx burner, belonging to the field of burner technology. It includes a housing, a mounting plate, a central tube, several first combustion tubes, and several second combustion tubes. The mounting plate is coaxially fixed in the housing, and the central tube is fixed to the mounting plate, with the central tube and mounting plate being coaxial. An ignition device is provided inside the central tube. The several first combustion tubes are distributed around the periphery of the central tube and are spaced apart along the circumference of the central tube. The several second combustion tubes are located on the side of the first combustion tubes away from the central tube and are spaced apart along the circumference of the mounting plate. Each first combustion tube includes a gas pipe and an air pipe. The air pipe is sleeved on the gas pipe and communicates with the gas pipe. An adjustment mechanism is provided on the air pipe for adjusting the orifice size connecting the air pipe and the gas pipe. This application allows for adjustment of the air-gas mixing ratio, ensuring complete combustion, reducing the generation of nitrogen oxides, and achieving an environmentally friendly effect.

Description

Technical Field

[0001] This application relates to the field of burners, and in particular to a low-NOx burner with environmentally friendly performance. Background Technology

[0002] A burner is a general term for a device that sprays fuel and air in a specific manner for combustion. The function of a burner is to atomize a sample through flame combustion. The atomized sample enters the burner and, under the influence of the flame temperature and atmosphere, undergoes processes such as drying, melting, evaporation, and dissociation, producing a large number of ground-state atoms, as well as some excited-state atoms, ions, and molecules.

[0003] In related technologies, Chinese patent CN113339794B discloses a low-NOx burner, comprising: a shell having a receiving cavity; a bellows plate disposed within the receiving cavity to divide the receiving cavity into a bellows chamber and a mounting cavity, the mounting cavity including a first opening disposed opposite to the bellows plate in a first direction; a plurality of combustion tubes mounted on the bellows plate and extending along the first direction; a flame nozzle tube including a first air pipe and a first gas pipe extending along the first direction, the first air pipe mounted on the bellows plate and sleeved on the first gas pipe, the first air pipe and the first gas pipe defining a first air passage, the first gas pipe including a straight section and a gradually expanding section; and an ignition device mounted on the bellows plate.

[0004] The fixed air intake into the gas pipe leads to insufficient mixing of gas and air, resulting in uneven flame temperature distribution during combustion and the generation of localized high-temperature areas. This, in turn, easily generates nitrogen oxides, causing environmental pollution, and therefore needs to be improved. Summary of the Invention

[0005] In order to improve the problem of incomplete combustion and the generation of nitrogen oxides due to the inability to adjust the air-fuel mixture ratio, which pollutes the environment, this application provides a low-NOx burner with environmental protection performance.

[0006] The low-NOx burner with environmental protection performance provided in this application adopts the following technical solution: An environmentally friendly low-NOx burner includes a housing, a mounting plate, a central tube, a plurality of first combustion tubes, and a plurality of second combustion tubes. The mounting plate is coaxially fixed in the housing, and the central tube is fixed to the mounting plate and coaxial with the mounting plate. An ignition device is provided inside the central tube. The plurality of first combustion tubes are distributed around the periphery of the central tube and are spaced apart along the circumference of the central tube. The plurality of second combustion tubes are located on the side of the first combustion tubes away from the central tube and are spaced apart along the circumference of the mounting plate. Each first combustion tube includes a gas pipe and an air pipe. The air pipe is sleeved on the gas pipe and communicates with the gas pipe. An adjustment mechanism is provided on the air pipe for adjusting the size of the orifice connecting the air pipe and the gas pipe.

[0007] By adopting the above technical solution, the ignition device of the central tube can quickly ignite the surrounding first and second combustion tubes. The layered arrangement of the first and second combustion tubes allows the gas and air to mix and burn in different areas of the casing, thereby improving combustion efficiency.

[0008] Air enters the gas pipe through the air pipe and mixes with the gas. The regulating mechanism is activated, flexibly adjusting the air-gas mixing ratio according to the actual combustion conditions to achieve more complete combustion. Reducing the amount of air introduced into the gas pipe causes oxygen-deficient combustion in the flame of the first combustion tube, producing reducing gases that reduce nitrogen oxides in the combustion flue gas, thereby reducing nitrogen oxide emissions and achieving environmental protection.

[0009] Optionally, the air pipe is provided with a plurality of gas supply pipes, the gas supply pipes are arranged radially along the air pipe, the gas supply pipes are connected to the air pipe, and the gas supply pipes are inserted into the gas pipe. A plurality of gas supply holes are opened through the side wall of the gas supply pipes, and the adjustment mechanism is used to adjust the size of the orifice connecting the gas supply holes to the gas pipes.

[0010] By adopting the above technical solution, several gas delivery pipes deliver air more evenly into the gas pipe. The gas delivery orifices are distributed around the perimeter of the gas delivery pipes, making the air delivered into the gas pipes more evenly distributed, thereby improving the uniformity of the gas-air mixture and resulting in more complete and stable combustion. The regulating mechanism can control the amount of air entering the gas pipe by changing the connecting diameter of the gas delivery orifices, thus adjusting the gas-air mixing ratio.

[0011] Optionally, the adjustment mechanism includes a drive component and an adjustment component. The drive component is disposed on the air pipe, and the adjustment component is inserted into the air inlet. The drive component is connected to the adjustment component. The drive component is used to drive the adjustment component to rotate in the air pipe, and the adjustment component can block the air inlet.

[0012] By adopting the above technical solution, the drive component is activated, which drives the adjustment component to rotate in the air supply pipe, thereby blocking the air supply hole and adjusting the size of the air supply hole, thus achieving the adjustment and control of the air intake volume.

[0013] Optionally, the regulating component includes a plurality of regulating tubes, each corresponding to a gas supply tube. The regulating tubes are coaxially inserted into the corresponding gas supply tubes, and the sidewalls of the regulating tubes are in contact with the inner walls of the gas supply tubes. A plurality of regulating holes are provided through the regulating tubes, and the regulating holes can communicate with the gas supply holes. The driving component is connected to the regulating tubes and is used to drive the regulating tubes to rotate.

[0014] By adopting the above technical solution, when the regulating pipe rotates, the overlapping area of ​​the regulating hole and the gas supply hole will change, thereby changing the size of the hole connecting the gas supply hole and the gas pipe, and realizing the regulation of the air intake volume.

[0015] Optionally, the drive assembly includes a movable rack and a plurality of movable gears. The movable rack is arranged along the length of the air pipe and is slidably connected to the air pipe. The plurality of movable gears correspond one-to-one with the adjustment pipe. One end of the adjustment pipe extends out of the air pipe and is coaxially fixed with the corresponding movable gear. The movable rack meshes with the movable gear.

[0016] By adopting the above technical solution, when the moving rack slides, it will drive the moving gear meshing with it to rotate, thereby causing the regulating tube to rotate.

[0017] Optionally, the air pipe is connected to the second combustion pipe via a connecting pipe, the connecting pipe is provided with a baffle, and the central pipe is provided with a rotating component for driving the baffle to rotate.

[0018] By adopting the above technical solution, the connecting pipe serves to connect the air pipe and the second combustion pipe, allowing air to be delivered from the air pipe to the second combustion pipe. The baffle can adjust the flow area of ​​the connecting pipe, thereby controlling the amount of air entering the second combustion pipe.

[0019] Optionally, the rotating assembly includes a rotating ring, an internal gear, and a plurality of rotating gears. The rotating ring is coaxially sleeved on the central tube and can rotate on the central tube about the central tube as an axis. The internal gear is disposed on the rotating ring and is coaxial with the rotating ring. The plurality of rotating gears correspond one-to-one with the baffles, and the rotating gears are coaxially fixed with the baffles. The rotating gears mesh with the internal gears.

[0020] By adopting the above technical solution, when the rotating ring rotates, the internal gear will drive the rotating gear meshing with it to rotate, thereby causing the baffle to rotate.

[0021] Optionally, a fixed ring is coaxially fixed on the central tube, and a plurality of guide plates are provided on the fixed ring. The plurality of guide plates are arranged radially with the center of the fixed ring as the center. One side of the guide plate in the length direction is rotatably connected to the fixed ring through a rotating shaft. A rotating assembly is provided on the rotating ring, and the rotating assembly is connected to the guide plate to drive the guide plate to rotate.

[0022] By adopting the above technical solution, the fixing ring serves to fix the guide plate, and a swirling channel is formed between adjacent guide plates, thereby causing the flowing air to swirl and distribute the air more evenly in the combustion area. This allows the flame generated by the central tube to extend further along the extension direction of the central axis, thereby improving the full stability of combustion.

[0023] Optionally, the rotating assembly includes an abutment block and a torsion spring. The abutment block is fixed on the rotating ring, and the torsion spring is sleeved on the rotating shaft. The torsion spring is connected to the fixed ring and is used to drive the guide plate to abut against the abutment block.

[0024] By adopting the above technical solution, the torsion spring ensures that the guide plate always abuts against the abutting block. When the rotating ring rotates, the abutting block makes a circular motion, that is, it gradually pushes against the guide plate along the width direction of the guide plate, causing the guide plate to rotate around the rotating shaft. This changes the tilt angle of the guide plate, thereby changing the direction of airflow and changing the distribution position of the air to adapt to different combustion angles and environments, thus improving its applicability.

[0025] Optionally, the rotating ring is provided with a mounting groove, the internal gear is inserted into the mounting groove, and the internal gear is connected to the inner wall of the mounting groove by a spring, so that the internal gear can be housed in the mounting groove.

[0026] By adopting the above technical solution, when it is necessary to adjust the rotation angle of the baffle, the inner gear extends out of the mounting groove and meshes with the rotating gear; when no adjustment is needed, only the tilt angle of the guide plate needs to be adjusted, the inner gear is pressed, the spring is compressed, so that the inner gear is stored in the mounting groove, that is, the inner gear is separated from the rotating gear. Then the rotating ring is rotated, so that the abutment block makes a circumferential movement, thereby pushing the guide plate and changing the tilt angle.

[0027] In summary, this application includes at least one of the following beneficial effects: 1. Several gas delivery pipes deliver air more evenly into the gas pipe. Gas delivery orifices are distributed around the perimeter of the gas delivery pipes, ensuring a more uniform distribution of air into the gas pipe, thereby improving the uniformity of the gas-air mixture and resulting in more complete and stable combustion. The regulating mechanism controls the amount of air entering the gas pipe by changing the diameter of the connecting orifices, thus adjusting the gas-air mixing ratio. 2. The torsion spring ensures that the guide plate always abuts against the abutment block. When the rotating ring rotates, the abutment block makes a circular motion, that is, it gradually pushes against the guide plate along the width direction of the guide plate, causing the guide plate to rotate around the pivot, thereby changing the tilt angle of the guide plate, thus changing the direction of airflow and changing the distribution position of the air to adapt to different combustion angles and environments, making it more adaptable. Attached Figure Description

[0028] Figure 1 This is a schematic diagram of the structure of a low-NOx burner with environmental protection performance according to an embodiment of this application; Figure 2 This is a schematic diagram showing the connection relationship between the first combustion tube and the second combustion tube. Figure 3 A schematic diagram of the structure of the adjustment component; Figure 4 This is a cross-sectional view of the second combustion tube. Figure 5 This is a cross-sectional view of the structure of a low-NOx burner with environmental protection performance according to an embodiment of this application.

[0029] In the diagram: 10, housing; 11, mounting plate; 20, central tube; 21, retaining ring; 30, first combustion tube; 31, gas tube; 32, air tube; 321, gas supply tube; 3211, gas supply port; 40, second combustion tube; 41, connecting tube; 50, adjusting mechanism; 51, drive assembly; 511, moving rack; 512, moving gear; 52, adjusting assembly; 521, adjusting tube; 5211, adjusting hole; 60, baffle; 70, rotating assembly; 71, rotating ring; 711, mounting groove; 72, internal gear; 721, spring; 73, rotating gear; 80, guide plate; 81, rotating shaft; 90, rotating assembly; 91, abutment block; 92, torsion spring. Detailed Implementation

[0030] The following is in conjunction with the appendix Figure 1-5 This application will be described in further detail.

[0031] This application discloses a low-NOx burner with environmentally friendly performance. (Refer to...) Figure 1 and Figure 2The environmentally friendly low-NOx burner includes a shell 10, a mounting plate 11, a central tube 20, a plurality of first combustion tubes 30, and a plurality of second combustion tubes 40. The mounting plate 11 is coaxially fixed in the shell 10, the central tube 20 is fixed on the mounting plate 11 and coaxial with the mounting plate 11, and an ignition device is provided inside the central tube 20. The plurality of first combustion tubes 30 are distributed around the central tube 20 and are arranged at intervals along the circumference of the central tube 20. The plurality of second combustion tubes 40 are located on the side of the first combustion tubes away from the central tube 20 and are arranged at intervals along the circumference of the mounting plate 11. This achieves a reasonable layout of the combustion tubes, realizes multi-zone combustion, and facilitates ignition and control.

[0032] Reference Figure 1 and Figure 2 The layered layout of the first combustion tube 30 and the second combustion tube 40 allows the gas and air to mix and burn in different areas, improving combustion efficiency. At the same time, the ignition device of the central tube 20 can quickly ignite the surrounding first combustion tube 30 and second combustion tube 40.

[0033] Reference Figure 1 and Figure 2 Specifically, the first combustion tube 30 includes a gas pipe 31 and an air pipe 32. The air pipe 32 is fitted onto the gas pipe 31 and communicates with it. The inner diameter of the air pipe 32 is larger than that of the gas pipe 31, and it is fitted onto the outside of the gas pipe 31 to provide the air required for gas combustion.

[0034] Reference Figure 2 and Figure 3 The air pipe 32 is provided with several gas delivery pipes 321, which are arranged radially along the air pipe 32. The gas delivery pipes 321 are connected to the air pipe 32 and inserted into the gas pipe 31. The gas delivery pipes 321 are generally thin tubular structures, made of the same material as the air pipe 32, and their function is to deliver air more evenly into the gas pipe 31. Several gas delivery holes 3211 are opened through the side wall of the gas delivery pipe 321, which are evenly arranged circumferentially along the gas delivery pipe 321. The air pipe 32 is provided with an adjustment mechanism 50, which is used to adjust the size of the gas delivery holes 3211, thereby controlling the amount of air entering the gas pipe 31 and thus adjusting the mixing ratio of gas and air.

[0035] Reference Figure 2 and Figure 3 The adjustment mechanism 50 includes a drive component 51 and an adjustment component 52. The drive component 51 is disposed on the air pipe 32, and the adjustment component 52 is inserted into the air outlet 3211. The drive component 51 is connected to the adjustment component 52. The drive component 51 is used to drive the adjustment component 52 to rotate in the air pipe 321, and the adjustment component 52 can block the air outlet 3211.

[0036] Reference Figure 2 and Figure 3 The regulating assembly 52 includes several regulating tubes 521, each corresponding to a gas supply pipe 321. The regulating tubes 521 are coaxially inserted into their respective gas supply pipes 321, with the sidewalls of the regulating tubes 521 fitting against the inner walls of the gas supply pipes 321. The regulating tubes 521 are generally made of smooth metal to reduce friction during rotation. Several regulating holes 5211 are provided through the regulating tubes 521, and these holes 5211 communicate with the gas supply holes 3211.

[0037] Reference Figure 2 and Figure 3 The drive assembly 51 includes a movable rack 511 and several movable gears 512. The movable rack 511 is arranged along the length of the air pipe 32 and is slidably connected to the air pipe 32. Each of the movable gears 512 corresponds to a regulating pipe 521. One end of the regulating pipe 521 extends out of the air pipe 32 and is coaxially fixed with the corresponding movable gear 512. The movable rack 511 meshes with the movable gears 512. When the movable rack 511 slides, it drives the meshing movable gear 512 to rotate, thereby causing the regulating pipe 521 to rotate. The movable rack 511 can be driven by an external cylinder or manually. When the regulating pipe 521 rotates, the overlapping area of ​​the regulating hole 5211 and the air supply hole 3211 changes, thereby changing the diameter of the air supply hole 3211 connecting to the gas pipe 31, thus achieving regulation and control of the air intake volume.

[0038] Reference Figure 2 and Figure 4 Air pipe 32 is connected to the second combustion pipe 40 via connecting pipe 41. A baffle 60 is provided in the connecting pipe 41, and a rotating assembly 70 for driving the baffle 60 to rotate is provided on the central pipe 20. Connecting pipe 41 serves to connect air pipe 32 and the second combustion pipe 40, allowing air to be delivered from air pipe 32 to the second combustion pipe 40. The baffle 60 can adjust the flow area of ​​connecting pipe 41, thereby controlling the amount of air entering the second combustion pipe 40.

[0039] Reference Figure 1 and Figure 5 The rotating assembly 70 includes a rotating ring 71, an internal gear 72, and several rotating gears 73. The rotating ring 71 is coaxially sleeved on the central tube 20 and can rotate about the central tube 20 as an axis. The internal gear 72 is mounted on the rotating ring 71 and is coaxial with it. Each of the rotating gears 73 corresponds to a baffle 60, and the rotating gears 73 are coaxially fixed with the baffle 60, meshing with the internal gear 72. When the rotating ring 71 rotates, the internal gear 72 drives the meshing rotating gears 73 to rotate, thereby causing the baffle 60 to rotate. The rotating ring 71 can be rotated via an external motor-driven belt transmission mechanism or manually.

[0040] Reference Figure 1 and Figure 5 A fixed ring 21 is coaxially fixed to the central tube 20. Several guide plates 80 are provided on the fixed ring 21, arranged radially around the center of the fixed ring 21. One side of each guide plate 80 along its length is rotatably connected to the fixed ring 21 via a rotating shaft 81. A rotating ring 71 is provided with a rotating assembly 90, which is connected to the guide plates 80 and used to drive the guide plates 80 to rotate. The fixed ring 21 serves to fix the guide plates 80, which guide the airflow direction. Adjacent guide plates 80 form swirling channels, causing the flowing air to swirl and distribute more evenly in the combustion zone. This allows the flame generated by the central tube 20 to extend further along the central axis, thereby improving the stability of combustion.

[0041] Reference Figure 1 and Figure 5 The rotating assembly 90 includes an abutment block 91 and a torsion spring 92. The abutment block 91 is fixed on the rotating ring 71, and the torsion spring 92 is sleeved on the rotating shaft 81. The torsion spring 92 is connected to the fixed ring 21 and is used to drive the guide plate 80 to abut against the abutment block 91. The torsion spring 92 ensures that the guide plate 80 always abuts against the abutment block 91. When the rotating ring 71 rotates, the abutment block 91 makes a circular motion, that is, it gradually pushes against the guide plate 80 along the width direction of the guide plate 80, causing the guide plate 80 to rotate about the rotating shaft 81. This changes the tilt angle of the guide plate 80, thereby changing the direction of airflow and changing the distribution position of the air to adapt to different combustion angles and environments, thus improving its applicability.

[0042] Reference Figure 1 and Figure 5 The rotating ring 71 has a mounting groove 711, in which an internal gear 72 is inserted. The internal gear 72 is connected to the inner wall of the mounting groove 711 via a spring 721, allowing it to be stored within the groove. When the rotation angle of the baffle 60 needs to be adjusted, the internal gear 72 extends from the mounting groove 711 and meshes with the rotating gear 73. Rotating the rotating ring 71 causes the internal gear 72 to drive the rotating gear 73, which in turn rotates the baffle 60. Simultaneously, the tilt angle of the guide plate 80 rotates, thereby adjusting the air intake volume and air distribution area.

[0043] When it is not necessary to adjust the size of the orifice of the connecting pipe 41, and only the tilt angle of the guide plate 80 needs to be adjusted, press the inner gear 72 to compress the spring 721, so that the inner gear 72 is housed in the mounting groove 711, that is, the inner gear 72 is separated from the rotating gear 73. Then rotate the rotating ring 71 to make the abutment block 91 move in a circular motion, thereby pushing the guide plate 80 and changing the tilt angle.

[0044] The implementation principle of an environmentally friendly low-NOx burner according to an embodiment of this application is as follows: By rationally arranging the central tube 20, the first combustion tube 30, and the second combustion tube 40, multi-zone gas and air mixing and combustion are achieved. The adjusting mechanism 50 can flexibly adjust the orifice size connecting the air tube 32 and the gas tube 31, thereby precisely controlling the gas-air mixing ratio, making combustion more complete, and reducing the generation of nitrogen oxides. The rotating components 70 and 90 further adjust the airflow and distribution, improving combustion efficiency and uniformity.

[0045] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. A low-NOx burner with environmentally friendly performance, characterized in that, The device includes a housing (10), a mounting plate (11), a central tube (20), a plurality of first combustion tubes (30), and a plurality of second combustion tubes (40). The mounting plate (11) is coaxially fixed in the housing (10). The central tube (20) is fixed on the mounting plate (11) and is coaxial with the mounting plate (11). An ignition device is provided inside the central tube (20). The plurality of first combustion tubes (30) are distributed around the central tube (20) and are spaced apart along the circumference of the central tube (20). The plurality of first combustion tubes (30) are arranged in a circumferential manner. The second combustion tube (40) is located on the side of the first combustion tube (30) away from the central tube (20), and a number of second combustion tubes (40) are arranged at intervals along the perimeter of the mounting plate (11). The first combustion tube (30) includes a gas pipe (31) and an air pipe (32). The air pipe (32) is sleeved on the gas pipe (31) and communicates with the gas pipe (31). An adjustment mechanism (50) is provided on the air pipe (32). The adjustment mechanism (50) is used to adjust the size of the orifice through which the air pipe (32) and the gas pipe (31) communicate.

2. The low-NOx burner with environmental protection performance according to claim 1, characterized in that, The air pipe (32) is provided with a plurality of gas supply pipes (321), the gas supply pipes (321) are arranged radially along the air pipe (32), the gas supply pipes (321) are connected to the air pipe (32), and the gas supply pipes (321) are inserted into the gas pipe (31). A plurality of gas supply holes (3211) are opened through the side wall of the gas supply pipes (321). The adjustment mechanism (50) is used to adjust the size of the hole through which the gas supply holes (3211) are connected to the gas pipe (31).

3. The low-NOx burner with environmental protection performance according to claim 2, characterized in that, The adjustment mechanism (50) includes a drive assembly (51) and an adjustment assembly (52). The drive assembly (51) is disposed on the air pipe (32), and the adjustment assembly (52) is inserted into the air outlet (3211). The drive assembly (51) is connected to the adjustment assembly (52). The drive assembly (51) is used to drive the adjustment assembly (52) to rotate in the air pipe (321), and the adjustment assembly (52) can block the air outlet (3211).

4. The low-NOx burner with environmental protection performance according to claim 3, characterized in that, The regulating component (52) includes a plurality of regulating tubes (521), each of which corresponds to a gas supply pipe (321). The regulating tubes (521) are coaxially inserted into the corresponding gas supply pipes (321), and the sidewall of the regulating tube (521) is in contact with the inner wall of the gas supply pipe (321). A plurality of regulating holes (5211) are provided through the regulating tubes (521), and the regulating holes (5211) can communicate with the gas supply holes (3211). The driving component (51) is connected to the regulating tubes (521) and is used to drive the regulating tubes (521) to rotate.

5. The low-NOx burner with environmental protection performance according to claim 4, characterized in that, The drive assembly (51) includes a movable rack (511) and a plurality of movable gears (512). The movable rack (511) is arranged along the length of the air pipe (32) and is slidably connected to the air pipe (32). The plurality of movable gears (512) correspond one-to-one with the adjusting pipe (521). One end of the adjusting pipe (521) extends out of the air pipe (32) and is coaxially fixed with the corresponding movable gear (512). The movable rack (511) meshes with the movable gear (512).

6. The low-NOx burner with environmental protection performance according to claim 2, characterized in that, The air pipe (32) is connected to the second combustion pipe (40) through a connecting pipe (41). A baffle (60) is provided in the connecting pipe (41), and a rotating assembly (70) for driving the baffle (60) to rotate is provided on the central pipe (20).

7. The low-NOx burner with environmental protection performance according to claim 6, characterized in that, The rotating assembly (70) includes a rotating ring (71), an internal gear (72), and a plurality of rotating gears (73). The rotating ring (71) is coaxially sleeved on the central tube (20) and can rotate on the central tube (20) with the central tube (20) as the axis. The internal gear (72) is disposed on the rotating ring (71) and is coaxial with the rotating ring (71). The plurality of rotating gears (73) correspond one-to-one with the baffle (60), and the rotating gears (73) are coaxially fixed with the baffle (60). The rotating gears (73) mesh with the internal gears (72).

8. The low-NOx burner with environmental protection performance according to claim 7, characterized in that, A fixing ring (21) is coaxially fixed on the central tube (20). A plurality of guide plates (80) are provided on the fixing ring (21). The plurality of guide plates (80) are arranged radially with the center of the fixing ring (21) as the center. One side of the guide plate (80) in the length direction is rotatably connected to the fixing ring (21) through a rotating shaft (81). A rotating component (90) is provided on the rotating ring (71). The rotating component (90) is connected to the guide plate (80) and is used to drive the guide plate (80) to rotate.

9. The low-NOx burner with environmental protection performance according to claim 8, characterized in that, The rotating assembly (90) includes an abutment block (91) and a torsion spring (92). The abutment block (91) is fixed on the rotating ring (71), and the torsion spring (92) is sleeved on the rotating shaft (81). The torsion spring (92) is connected to the fixed ring (21), and the torsion spring (92) is used to drive the guide plate (80) to abut against the abutment block (91).

10. The low-NOx burner with environmental protection performance according to claim 7, characterized in that, The rotating ring (71) is provided with a mounting groove (711), the internal gear (72) is inserted into the mounting groove (711), and the internal gear (72) is connected to the inner wall of the mounting groove (711) by a spring (721). The internal gear (72) can be housed in the mounting groove (711).

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