Low-nitrogen combustor

Abstract

The invention relates to the technical field of combustors, solves the problem that in the prior art, the combustion range cannot be adjusted, and discloses a low-nitrogen combustor which comprises a shell, a fan system, a fuel gas supply system and an ignition system, and the fan system, the fuel gas supply system and the ignition system are sequentially connected to the shell. A plurality of driving pendulous reeds and a plurality of gap sealing pieces are arranged at the flaming end part of the shell; the driving pendulous reeds are rotationally connected with the shell, and the driving pendulous reeds are arranged in the circumferential direction; the plurality of gap sealing pieces are rotationally connected with the shell, are arranged in the circumferential direction and are located on the inner side of the space defined by the driving pendulous reed; a control ring is connected to the shell in a sliding mode. A plurality of connecting rods and a plurality of elastic pieces are arranged on the control ring; the connecting rod is rotationally connected with the driving pendulous reed; the elastic piece is connected with the gap sealing piece; the shell is further provided with a control assembly used for driving the control ring to slide. By adjusting the positions of the driving swing piece and the gap sealing piece, the flame coverage range and the flame form can be optimized, and the combustion efficiency is improved.

Description

Technical Field

[0001] The present application relates to the technical field of burners, and in particular to a low-nitrogen burner. Background Art

[0002] Low-nitrogen burners refer to burners that use low-nitrogen combustion technology. Through a specific design, air and fuel are graded and mixed in a certain way to reduce the emission of NOx (nitrogen oxides) during fuel combustion. This type of burner usually integrates a blower, induced draft fan, inverter, control valve and multiple circuits to achieve a more efficient and environmentally friendly heat supply. It is generally used in equipment such as boilers, water heaters, drying furnaces, kilns, etc.

[0003] The prior art has a low-nitrogen burner including a shell, a fuel system, a fan system, an ignition system, a monitoring system and an electronic control system. The fuel system is responsible for providing fuel to the burner to ensure a stable supply of fuel and efficient combustion. The fan system sends air with a certain wind speed and air volume into the combustion chamber to meet the combustion needs. Its main components include a fan motor, a fan impeller, an air inlet channel, a damper controller, a damper baffle, a diffusion disk, etc. The fan impeller generates sufficient wind pressure through high-speed rotation to overcome the resistance of the furnace and the chimney, and blows sufficient air into the combustion chamber. The air inlet channel plays a role in guiding the air flow and stabilizing the wind pressure. The damper controller controls the rotation of the damper baffle through a mechanical connecting rod to adjust the air intake. The main function of the damper baffle is to adjust the size of the air inlet channel to control the size of the air intake. The special structure of the diffusion disk can generate a rotating airflow, which helps to fully mix the air and fuel, and also has the function of adjusting the secondary air volume. The ignition system ignites the mixture of air and fuel, and its main components include an ignition transformer, an ignition electrode, and an electric fire high-voltage cable. The monitoring system monitors the flame, temperature, pressure and other parameters in the combustion process in real time to ensure the safety and stability of combustion. The electronic control system is the command center and contact center of the above systems. The main control element is the program controller. Different program controllers are equipped according to different burners to achieve precise control of the combustion process.

[0004] Regarding the above-mentioned related technologies, the existing technology can only adjust the flame intensity by adjusting the air intake volume, and the combustion range cannot be adjusted, and lacks adaptability to different scenarios and different equipment working conditions. Summary of the invention

[0005] In order to improve the defect of the prior art that the combustion range cannot be adjusted, the present application provides a low-nitrogen burner.

[0006] The following technical solutions are adopted: A low-nitrogen burner comprises a shell, and a fan system, a gas supply system and an ignition system which are sequentially connected to the shell; a plurality of active pendulums and a plurality of sealing gaps are arranged at the flame-spraying end of the shell; one end of the active pendulum is rotatably connected to the shell, and the other end extends outward, and the plurality of active pendulums are circumferentially spaced apart; one end of a plurality of sealing gaps is rotatably connected to the shell, and the other end extends outward, and the plurality of sealing gaps are circumferentially spaced apart and are located on the inner side of the space enclosed by the active pendulums; the position of the sealing gaps corresponds to the gap between adjacent active pendulums; a control ring is slidably connected to the shell; a plurality of connecting rods and a plurality of elastic parts are arranged on the control ring; the connecting rod is rotatably connected to the active pendulum; the elastic part is connected to the sealing gap; a control component for driving the control ring to slide is also arranged on the shell.

[0007] By adopting the above technical solution, the low-nitrogen burner provides air flow through the fan system, the gas supply system supplies fuel, and the ignition system ignites the air-fuel mixture. The setting of the active pendulum and the sealing piece and their connection with the control ring, connecting rod and elastic member enable the active pendulum to adjust the size and shape of the flame outlet, while the sealing piece is used to block the gap between the active pendulums and further adjust the fine structure of the flame to reduce the generation of nitrogen oxides. By adjusting the position of the active pendulum and the sealing piece, the coverage range and flame shape of the flame can be optimized, the combustion efficiency can be improved, and the emission of nitrogen oxides can be reduced to meet environmental protection requirements.

[0008] Optionally, the shell includes a fan chamber, an air supply chamber and an air-fuel mixing chamber arranged in sequence; the fan system includes a wind wheel and a fan driving component, the wind wheel is rotatably connected to the fan chamber, and the fan driving component drives the wind wheel to rotate; the gas supply system is connected to the air-fuel mixing chamber.

[0009] By adopting the above technical solution, the shell is divided into a fan chamber, an air supply chamber and an air-fuel mixing chamber. The fan system drives the wind wheel to rotate in the fan chamber to generate air flow. The gas supply system is connected to the air-fuel mixing chamber to mix the fuel with the air. This allows the air and fuel to be fully mixed to improve the combustion efficiency. At the same time, it helps to stabilize and evenly flow the air, further reducing the generation of nitrogen oxides.

[0010] Optionally, the shell is provided with an air uniforming disk at one end of the air-fuel mixing chamber away from the air delivery chamber, and the ignition system is arranged on the air uniforming disk.

[0011] By adopting the above technical solution, the gas uniformity disk can further evenly mix the air and fuel gas, making the flame more stable and the combustion efficiency higher, while reducing flame fluctuations and the generation of nitrogen oxides.

[0012] Optionally, the fan chamber is a cylindrical structure, and the air supply chamber extends along the tangential direction of the fan chamber; a plurality of adjustment blades are arranged in the fan chamber; a plurality of the adjustment blades are arranged on the outer peripheral side of the wind wheel; one end of the adjustment blade is rotatably connected to the inside of the fan chamber, and the other end can be rotated to abut against the adjacent adjustment blade; when a plurality of the adjustment blades abut against each other, the fan chamber is divided into an inner cavity and an outer cavity; a partition is provided in the middle of the air supply chamber, and the internal space of the air supply chamber is divided into an upper air duct and a lower air duct with the partition as the boundary; the lower air duct is connected to the inner cavity; an adjustment component for driving a plurality of the adjustment blades to rotate is provided outside the shell.

[0013] By adopting the above technical solution, the inner cavity and the outer cavity are separated or connected by adjusting the blades, or the air flow space in the fan chamber is controllable to increase or reduce the air pressure, and then adjust the flame state, so that the flame spray distance is maintained within a certain domain value in the state of shrinking or expanding.

[0014] Optionally, a slide groove is provided at the connection between the bottom of the air supply chamber and the fan chamber, and the slide groove is parallel to the partition; a docking plate is slidably connected in the slide groove, and the docking plate can slide to abut the adjusting blade; a spring is provided in the slide groove to ensure that the docking plate always has a tendency to extend outward.

[0015] By adopting the above technical solution, after the inner cavity and the outer cavity are isolated, the connecting plate is used to close the gap between the inner cavity and the lower air duct flowing to the outer cavity, thereby optimizing the air flow.

[0016] Optionally, the adjustment assembly includes a driving ring, an adjusting driving member and a plurality of driven gears; the plurality of adjusting blades are connected to the shell through a blade shaft, one end of the blade shaft passes through the outer wall of the shell and is connected to the driven gear; the driving ring is rotatably connected to the shell, and the plurality of driven gears are engaged with the inner side of the driving ring; the adjusting driving member drives the driving ring to rotate.

[0017] Optionally, the adjusting drive member is connected to the shell, and a driving gear is provided at the output end of the adjusting drive member; the driving gear meshes with the outer side of the driving ring.

[0018] By adopting the above technical solution, the adjusting assembly realizes the synchronous rotation of the adjusting blades through the cooperation of the driving ring, the adjusting driving member and the driven gear.

[0019] Optionally, the control assembly includes a control rod and a control block, the control block is connected to the control ring; one end of the control rod passes through the control block, and the control rod is threadedly connected to the control block; the other end of the control rod is connected to the adjustment drive member.

[0020] By adopting the above technical solution, the control assembly realizes the linkage between the control ring and the adjusting blade through the connection between the control rod and the adjusting drive member.

[0021] Optionally, the output end of the adjusting drive member is provided with a driving bevel gear, the control rod is provided with a driven bevel gear, the driving bevel gear meshes with the driven bevel gear, and the control rod is rotatably connected to the housing via a bracket.

[0022] Optionally, an outer wall on one side of the fan chamber is provided with an air hole along the axis, and an air filter is provided on the air hole.

[0023] By adopting the above technical solution, the setting of the air filter can prevent impurities and pollutants from entering the fan room, protecting the cleanliness and normal operation of the fan system and the burner. In summary, the present application includes at least one of the following beneficial effects: 1. Through the setting and adjustment of active swing blades, sealing blades, regulating blades and uniform air discs, the flame coverage range and flame shape can be optimized, the combustion efficiency can be improved, and the emission of nitrogen oxides can be reduced.

[0024] 2. Through the coordination of control components, adjustment components, active bevel gears, driven bevel gears and other structures, the flame coverage range and combustion efficiency can be flexibly adjusted and controlled, thereby improving the reliability and stability of the burner.

[0025] 3. The setting of air filter can prevent impurities and pollutants from entering the fan room and burner, protect their cleanliness and normal operation, and extend their service life. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 It is a schematic diagram of the overall structure of this embodiment; Figure 2 yes Figure 1 Schematic diagram of the structure on the other side; Figure 3 yes Figure 1 A schematic diagram of the enlarged structure at point A; Figure 4 is a schematic diagram of a sectional structure of a shell in side view; Figure 5 It is a schematic diagram of the cross-sectional structure of the shell viewed from above; Figure 6 yes Figure 5 A schematic diagram of the enlarged structure at B; Figure 7 yes Figure 4 The other side shows a schematic diagram of the cross-section structure; Figure 8 yes Figure 5 Enlarged structural diagram at C.

[0027] Explanation of reference numerals: 1. housing; 11. fan chamber; 111. air hole; 112. air filter; 113. inner cavity; 114. outer cavity; 12. annular tube; 13. air supply chamber; 131. partition; 132. guide plate; 133. upper air duct; 134. lower air duct; 135. chute; 136. docking plate; 1361. spring; 14. air-fuel mixing chamber; 15. uniform air disk; 16. bracket; 2. fan system; 21. wind wheel; 211. connecting disk; 212. connecting ring; 213. fan blade ; 22. Fan drive; 3. Fuel supply system; 4. Ignition system; 51. Active swing plate; 52. Sealing plate; 53. Control ring; 531. Connecting rod; 532. Elastic member; 6. Control assembly; 61. Control rod; 611. Driven bevel gear; 62. Control block; 7. Adjusting blade; 711. Blade shaft; 712. Driven gear; 8. Adjusting assembly; 81. Drive ring; 811. Internal teeth; 812. External teeth; 82. Adjusting drive; 821. Active gear; 822. Active bevel gear. DETAILED DESCRIPTION

[0028] The following is combined with Figure 1 To Attachment Figure 8 This application is described in further detail.

[0029] The low-nitrogen burner in the prior art includes a shell, and a fan system, a fuel supply system, and an ignition system connected to the shell in sequence. In addition, a monitoring system and an electronic control system are also provided. In the prior art, the diameter of the working end (flame spraying end) of the shell is constant. Therefore, the flame can adjust its intensity according to the speed and air volume of the air injected by the fan system. However, the range of flame coverage is always within a certain range. This state cannot adapt to the optimal working conditions in the preheating stage, stable stage, and peak stage of a single device (such as a gas burner). Specifically, in the preheating stage, the equipment should be heated over a large range to achieve high efficiency and low time consumption for preheating. In the stable stage, the flame coverage should be reduced because the heat inside the equipment is sufficient and the combustion products per unit passing through the flame can fully react. Therefore, unit combustion efficiency and concentrated combustion are more needed. In the peak stage, the unit flame volume needs to surge, and the flame concentration is more needed to improve the combustion efficiency. When the low-nitrogen burner needs to switch between multiple devices, the cross-sectional sizes of the combustion channels between the devices are different, so it is more necessary to adapt the flame coverage range.

[0030] Therefore, in order to improve the adaptability of the low nitrogen burner, the flame coverage range should be adjustable. Figures 1 to 3, this embodiment discloses a low nitrogen burner. It includes six parts: a shell 1, a fan system 2, a fuel supply system 3, an ignition system 4, a monitoring system and an electronic control system. A plurality of active pendulums 51 and a plurality of sealing gaps 52 are arranged at the flame spraying end of the shell 1. One end of the active pendulum 51 is rotatably connected to the shell 1, and the other end initially extends along the flow direction of the air-fuel mixture. After the active pendulum 51 rotates, it forms an angle with the flow direction of the air-fuel mixture. A plurality of active pendulums 51 are arranged at intervals in the circumferential direction to form a circle of tubular structures that initially extend along the length direction of the shell 1. The active pendulum 51 can form a trumpet-shaped structure or a funnel-shaped structure after rotation. One end of a plurality of sealing gaps 52 is rotatably connected to the shell 1, and the other end extends outward. A plurality of sealing gaps 52 are arranged at intervals in the circumferential direction. The sealing gaps 52 are located in the space enclosed by the active pendulum 51, and also enclose a circle. The arrangement position of the sealing gaps 52 is staggered with the active pendulum 51, that is, the sealing gaps 52 correspond to the gap position between the two active pendulums 51. The sealing piece 52 is the same shape as the active swing piece 51, and only differs in size. Both are long strip-like structures with an arc-shaped cross-section, and the width is wider near the shell 1 and gradually narrows outward. A control ring 53 is slidably connected to the shell 1. A plurality of connecting rods 531 and a plurality of elastic members 532 are provided on the control ring 53. One end of the connecting rod 531 is rotatably connected, and the other end is rotatably connected to the active swing piece 51. The elastic member 532 is a tension spring, and one end of the elastic member 532 is connected to the sealing piece 52, and the other end is connected to the control ring 53. A control component 6 for driving the control ring 53 to slide is also provided on the shell 1. In other embodiments, the control ring 53 can be driven to rotate, thereby driving the connecting rod 531 and the elastic member 532 to move, so as to control the movement of the active swing piece 51 and the sealing piece 52. Therefore, the control ring 53 is moved by the control assembly 6, and the active swing piece 51 is pulled or pushed by the connecting rod 531 to expand outward or contract inward at the same time. At the same time, the sealing piece 52 also moves under the action of the elastic member 532 to block the gap between the active swing pieces 51 and prevent the flame from leaking out. When the active swing piece 51 and the sealing piece 52 are expanded outward at the same time, the coverage of the flame increases, and a large range of burning can be performed. When the active swing piece 51 and the sealing piece 52 are contracted inward at the same time, the coverage of the flame is reduced, and the flame is more concentrated, and the airflow pressure is greater, the center temperature is higher, and the burning efficiency of the combustion object is higher.

[0031] Reference Figure 4 and Figure 5Specifically, the housing 1 includes a fan chamber 11, an air supply chamber 13 and an air-fuel mixing chamber 14 which are arranged in sequence, and the three form a structure with a cross-section of type b. The fan chamber 11 is a cylindrical structure, and an air hole 111 for supplying air inward is opened on the outer wall of one side of the fan chamber 11 along the axial direction. The fan system 2 is arranged in the fan chamber 11. The air supply chamber 13 is a rectangular pipe structure, and the air supply chamber 13 extends outward along the tangent direction of the fan chamber 11. The air-fuel mixing chamber 14 is connected to the end of the air supply chamber 13, and the air-fuel mixing chamber 14 is a circular pipe structure. Setting the air-fuel mixing chamber 14 to a circular shape is conducive to the mixing of air and combustible gas, and in other embodiments, it can be set to other shapes. The arc angle at the connection between the air supply chamber 13 and the air-fuel mixing chamber 14 is uniformly transitioned to prevent turbulence. The air supply pipe of the fuel supply system 3 is connected to the air-fuel mixing chamber 14. The feeding direction of the fuel supply system 3 is perpendicular or arranged at an acute angle to the air flow direction. The end of the air-fuel mixing chamber 14 is covered with an air distribution disk 15, and the ignition coil of the ignition system 4 is arranged on the outside of the air distribution disk 15. The air distribution disk 15 is provided with a plurality of conical holes in an array for releasing the air-fuel mixture. The air distribution disk 15 divides the air-fuel mixture into small uniform air flows for discharge, and is ignited by the ignition system 4 to form a flame. The fuel supply system 3 is used to supply fuel, and is related to the prior art and will not be described in detail here. The air is sucked into the fan chamber 11 by the fan system 2 through the air hole 111, and the pressurized air enters the air supply chamber 13 and flows into the air-fuel mixing chamber 14. At the same time, the fuel supply system 3 delivers fuel into the air-fuel mixing chamber 14, and the air and fuel are mixed and ignited after passing through the air distribution disk 15 to form a flame.

[0032] Furthermore, the monitoring system monitors the flame, temperature, pressure and other parameters in the combustion process in real time to ensure the safety and stability of the combustion. The command center and contact center of the above systems of the electronic control system are mainly controlled by remote controllers. Remote adjustment is performed according to different combustion conditions to achieve precise control of the combustion process. Both are prior art and will not be described in detail here.

[0033] Furthermore, the housing 1 is provided with an air filter 112 at the air hole 111 for filtering impurities in the air. In other embodiments, a damper plate and a damper controller may also be provided. The damper plate is used to adjust the size of the air inlet channel to control the size of the air inlet volume. The damper controller controls the rotation of the damper plate through the mechanical connecting rod 531 to adjust the air inlet volume.

[0034] Reference Figure 4 and Figure 6Specifically, the fan system 2 includes a wind wheel 21 and a fan driver 22. The wind wheel 21 includes a connecting disk 211, a connecting ring 212 and a plurality of blades 213. The connecting disk 211 and the connecting ring 212 are coaxially arranged. The two ends of the blades 213 are respectively connected to the connecting disk 211 and the connecting ring 212. The blades 213 are arranged circumferentially along the axis of the connecting disk 211, and the blades 213 are inclined. The fan driver 22 is a motor. The fan driver 22 is arranged outside the housing 1. The outer shell of the fan driver 22 is connected to the housing 1. The output shaft of the fan driver 22 passes through the outer wall of the housing 1 to the center of the connecting disk 211 in the fan chamber 11. The connecting ring 212 is located at a position corresponding to the air hole 111, and the air hole 111 is concentric with the connecting ring 212.

[0035] It is worth noting that the shrinking or expanding structure formed by the active swing piece 51 and the sealing piece 52 will affect the spray distance of the flame. That is, when the air volume and wind speed are the same, in the shrinking state, the flame is pressurized, and the spray distance is greater than the position in the initial state; in the expanding state, the flame pressure is reduced, and the spray distance is less than the position in the initial state, resulting in incomplete combustion. Fluctuations in the spray distance will affect safe production, and when switching between different equipment, the inside of the equipment may be burned due to the long spray distance. Therefore, in the shrinking and expanding states, the flame spray distance needs to be kept within a certain domain value. Accordingly, this embodiment further optimizes the structure inside the fan chamber 11.

[0036] Reference Figure 4 Specifically, a plurality of adjusting blades 7 are arranged in the fan chamber 11. The plurality of adjusting blades 7 are arranged on the outer peripheral side of the wind wheel 21 with the rotating shaft of the wind wheel 21 as the axis, forming a structure similar to a circular array. The length of the adjusting blade 7 is the same as that of the wind wheel 21. One end of the adjusting blade 7 is rotatably connected to the inside of the fan chamber 11, and the other end can be rotated to abut against the adjacent adjusting blade 7. When the plurality of adjusting blades 7 abut against each other, the fan chamber 11 is divided into an inner cavity 113 and an outer cavity 114. A partition 131 is provided in the middle of the air supply chamber 13, and the internal space of the air supply chamber 13 is divided into an upper air duct 133 and a lower air duct 134 with the partition 131 as the boundary. The upper air duct 133 is always connected to the outer cavity 114. At the connection portion between the lower air duct 134 and the inner cavity 113, no adjusting blade 7 is provided, so that the lower air duct 134 is always connected to the inner cavity 113. That is, when the adjusting blades 7 rotate to abut each other, the inner cavity 113 and the outer cavity 114 are separated, and after the wind wheel 21 rotates, the pressurized air only flows from the inner cavity 113 to the lower air duct 134, and is sent to the air-fuel mixing chamber from the lower air duct 134. On the contrary, when the adjusting blades 7 rotate to separate from each other, the gas in the inner cavity 113 and the outer cavity 114 flows freely and enters the air-fuel mixing chamber 14 from the upper air duct 133 and the lower air duct 134 at the same time. An adjusting assembly 8 for driving a plurality of adjusting blades 7 to rotate is arranged outside the housing 1.

[0037] Reference Figure 4Furthermore, since the air still needs to pass through the outer cavity 114 when flowing between the inner cavity 113 and the lower air duct 134, this will cause the loss of some air. Therefore, in order to optimize the air flow state. A slide groove 135 is provided at the connection between the bottom of the air supply chamber 13 and the fan chamber 11, and the slide groove 135 is parallel to the partition 131. A docking plate 136 is slidably connected in the slide groove 135, and the docking plate 136 can slide to abut against the adjusting blade 7. A spring 1361 is provided in the slide groove 135 to make the docking plate 136 always have a tendency to extend outward. When the adjusting blade 7 separates the inner cavity 113 and the outer cavity 114, the docking plate 136 closes the gap between the inner cavity 113 and the lower air duct 134 that flows to the outer cavity 114, thereby optimizing the air flow.

[0038] Reference Figure 7 Furthermore, the adjustment component 8 includes a drive ring 81, an adjustment drive member 82 and a plurality of driven gears 712. An annular tube 12 is arranged outside the shell 1 to support the drive ring 81 and protect the adjustment component 8. The annular tube 12 is arranged on the same side of the fan drive member 22, and the two are concentric. A plurality of adjustment blades 7 are connected to the shell 1 through a blade shaft 711, and one end of the blade shaft 711 passes through the outer wall of the shell 1 and is connected to the driven gear 712. The drive ring 81 is rotatably connected to the shell 1 through the annular tube 12, and the inner wall of the drive ring 81 is provided with internal teeth 811, and a plurality of driven gears 712 are all meshed with the internal teeth 811. The adjustment drive member 82 is a motor, and the adjustment drive member 82 is connected to the shell 1 and drives the drive ring 81 to rotate. A driving gear 821 is arranged at the output end of the adjustment drive member 82; an external tooth 812 is arranged on the outer wall of the drive ring 81; and the driving gear 821 meshes with the external tooth 812.

[0039] Reference Figure 4 Furthermore, a guide plate 132 for adjusting the air flow direction is provided at the connection between the air delivery chamber 13 and the air-fuel mixing chamber 14. The guide plate 132 is located at the end of the partition plate 131, and the guide plate 132 is arranged to be tilted upward.

[0040] Reference Figure 3 and Figure 8 Further, the control assembly 6 includes a control rod 61 and a control block 62, and the control block 62 is connected to the control ring 53. One end of the control rod 61 passes through the control block 62, and the control rod 61 is threadedly connected to the control block 62. The other end of the control rod 61 is connected to the adjustment drive member 82. The output end of the adjustment drive member 82 is provided with a driving bevel gear 822, and the control rod 61 is provided with a driven bevel gear 611. The driving bevel gear 822 meshes with the driven bevel gear 611, and the control rod 61 is rotatably connected to the housing 1 through the bracket 16.

[0041] Therefore, the adjustment drive member 82 can adjust the active swing piece 51 to move while driving the plurality of adjustment blades 7 to rotate. When the active swing piece 51 needs to be retracted inward, the adjustment blades 7 separate from each other, so that the inner cavity 113 and the outer cavity 114 are connected, at which time the wind pressure generated by the wind wheel 21 is reduced, and the flame spraying distance is retracted. When the active swing piece 51 needs to be expanded outward, the adjustment blades 7 abut against each other, separating the inner cavity 113 and the outer cavity 114, so that the wind pressure generated by the wind wheel 21 increases, thereby increasing the pressure during flame spraying, and increasing the flame spraying distance.

[0042] The implementation principle of a low nitrogen burner in the embodiment of the present application is: The fan driving component 22 drives the wind wheel 21 to rotate at a high speed. The air enters the fan chamber 11 through the air filter 112, and is sent into the air supply chamber 13 after being pressurized by the wind wheel 21. The fuel supply system 3 supplies fuel to the air-fuel mixing chamber 14 to mix with the air. Under the action of aerodynamic force, the air-fuel mixed gas passes through the gas uniformizing disk 15 and is ignited to form a flame.

[0043] As required, the driving member 82 is controlled and adjusted to move the control ring 53 to perform the following state adjustment.

[0044] In the expansion state, the connecting rods 531 pull the active swing pieces 51 to expand outward at the same time. At the same time, the adjusting driving member 82 controls the driving ring 81 to rotate, so that the adjusting blades 7 abut against each other, and the adjusting blades 7 separate the inner cavity 113 and the outer cavity 114, thereby reducing the effective space of the fan chamber 11 and pressurizing the air. At this time, the coverage of the flame is increased, and a large range of burning can be performed.

[0045] In the shrinking state, the connecting rods 531 push the active swinging pieces 51 to rotate inward at the same time. At the same time, the adjusting driving member 82 controls the driving ring 81 to rotate, so that the adjusting blades 7 are separated from each other, and the inner cavity 113 and the outer cavity 114 are connected, so that the effective space of the fan chamber 11 is increased and the air pressure is reduced. At this time, the coverage of the flame increases and decreases, and the flame is more concentrated.

[0046] The above are all preferred embodiments of the present application, and the protection scope of the present application is not limited thereto. Therefore, any equivalent changes made according to the structure, shape, and principle of the present application should be included in the protection scope of the present application.

Claims

1. A low nitrogen burner, comprising a housing (1), and a fan system (2), a gas supply system and an ignition system (4) connected to the housing (1) in sequence; Features: The flame-spraying end of the shell (1) is provided with a plurality of active swing pieces (51) and a plurality of gap-sealing pieces (52); one end of the active swing piece (51) is rotatably connected to the shell (1), and the other end extends outwardly, and the plurality of active swing pieces (51) are arranged at intervals in the circumferential direction; one end of the plurality of gap-sealing pieces (52) is rotatably connected to the shell (1), and the other end extends outwardly, and the plurality of gap-sealing pieces (52) are arranged at intervals in the circumferential direction and are located inside the space enclosed by the active swing pieces (51); the position of the gap-sealing piece (52) corresponds to the gap between adjacent active swing pieces (51); A control ring (53) is slidably connected to the shell (1); a plurality of connecting rods (531) and a plurality of elastic members (532) are provided on the control ring (53); the connecting rod (531) is rotatably connected to the active swing plate (51); the elastic member (532) is connected to the sealing plate (52); the control ring (53) is slidably connected to the outside of the shell and slides along the length direction; the shell (1) is also provided with a control component (6) for driving the control ring (53) to slide.

2. A low nitrogen burner according to claim 1, characterized in that: The housing (1) comprises a fan chamber (11), an air supply chamber (13) and an air-fuel mixing chamber (14) which are arranged in sequence; the fan system (2) comprises a wind wheel (21) and a fan driving member (22); the wind wheel (21) is rotatably connected to the fan chamber (11), and the fan driving member (22) drives the wind wheel (21) to rotate; and the gas supply system is connected to the air-fuel mixing chamber (14).

3. A low nitrogen burner according to claim 2, characterized in that: The housing (1) is provided with an air distribution disk (15) at one end of the air-fuel mixing chamber (14) away from the air supply chamber (13), and the ignition system (4) is arranged on the air distribution disk (15).

4. A low nitrogen burner according to claim 3, characterized in that: The fan chamber (11) is a cylindrical structure, and the air supply chamber (13) extends in a tangential direction of the fan chamber (11); a plurality of adjustment blades (7) are arranged in the fan chamber (11); the plurality of adjustment blades (7) are arranged on the outer peripheral side of the wind wheel (21); one end of the adjustment blade (7) is rotatably connected to the inside of the fan chamber (11), and the other end can be rotatably abutted against an adjacent adjustment blade (7); when the plurality of adjustment blades (7) abut against each other, The fan chamber (11) is divided into an inner chamber (113) and an outer chamber (114); a partition (131) is provided in the middle of the air supply chamber (13); the inner space of the air supply chamber (13) is divided into an upper air duct (133) and a lower air duct (134) by the partition (131); the lower air duct (134) is always connected to the inner chamber (113); and an adjustment component (8) for driving a plurality of the adjustment blades (7) to rotate is provided outside the housing (1).

5. A low nitrogen burner according to claim 4, characterized in that: A slide groove (135) is provided at the connection between the bottom of the air supply chamber (13) and the fan chamber (11), and the slide groove (135) is parallel to the partition plate (131); a docking plate (136) is slidably connected in the slide groove (135), and the docking plate (136) can slide to abut against the regulating blade (7); a spring (1361) is provided in the slide groove (135) so that the docking plate (136) always has a tendency to extend outward.

6. A low nitrogen burner according to claim 4, characterized in that: The adjustment assembly (8) comprises a drive ring (81), an adjustment drive member (82) and a plurality of driven gears (712); the plurality of adjustment blades (7) are connected to the housing (1) via a blade shaft (711); one end of the blade shaft (711) passes through an outer wall of the housing (1) and is connected to the driven gear (712); the drive ring (81) is rotatably connected to the housing (1); the inner ring of the drive ring (81) is provided with internal teeth, and the plurality of driven gears (712) are all meshed with the inner side of the drive ring (81); and the adjustment drive member (82) drives the drive ring (81) to rotate.

7. A low nitrogen burner according to claim 6, characterized in that: The adjusting drive member (82) is connected to the housing (1), and a driving gear (821) is provided at the output end of the adjusting drive member (82); external teeth are provided on the outside of the driving ring (81), and the driving gear (821) meshes with the outside of the driving ring (81).

8. A low nitrogen burner according to claim 6, characterized in that: The control assembly (6) comprises a control rod (61) and a control block (62); the control block (62) is connected to the control ring (53); one end of the control rod (61) passes through the control block (62), and the control rod (61) is threadedly connected to the control block (62); the other end of the control rod (61) is coaxially connected to the adjustment drive member (82).

9. A low nitrogen burner according to claim 8, characterized in that: The output end of the adjustment drive member (82) is provided with a driving bevel gear (822), the control rod (61) is provided with a driven bevel gear (611), the driving bevel gear (822) meshes with the driven bevel gear (611), and the control rod (61) is rotatably connected to the housing (1) via a bracket (16).

10. A low nitrogen burner according to claim 2, characterized in that: An air hole (111) is formed on an outer wall of one side of the fan chamber (11) along the axis, and an air filter (112) is arranged on the air hole (111).

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