Gas-fired boiler low-nitrogen burner capable of conveniently adjusting gas inflow

Abstract

The invention discloses a gas-fired boiler low-nitrogen burner convenient to adjust gas inflow, and relates to the technical field of boilers, the gas-fired boiler low-nitrogen burner convenient to adjust gas inflow comprises a motor, a gas inlet pipe and a driving mechanism, a first adjusting mechanism is arranged in the gas inlet pipe, and the driving mechanism comprises a fixing disc coaxially fixed to an output shaft of the motor; the outer edge of the side wall of the fixed disc is provided with a plurality of fixed frames which are distributed along the circumferential direction of the fixed disc in an array manner; according to the device, motor rotating speed regulation and control and air door opening and closing regulation and control are combined, when the rotating speed of the motor is increased, centrifugal force drives a balancing weight to move outwards, a first telescopic rod, a fixing pipe and a second telescopic rod push a spiral rod to move axially, the spiral rod is matched with a limiting column, and linear motion is converted into rotation of a first annular fluted disc; therefore, all the blades are driven to integrally and synchronously change the deflection angles of the blades, a sensor and a complex circuit are omitted, the occupied area and the manufacturing cost of the system are reduced, the air inlet amount can be adjusted in a stepless mode in real time according to the air inlet requirement, and different air inlet requirements are met.

Description

Technical Field

[0001] This invention relates to the field of boiler technology, specifically to a low-NOx burner for a gas-fired boiler that facilitates adjustment of the air intake. Background Technology

[0002] A gas-fired boiler is a thermal energy device that uses gaseous fuels such as natural gas and liquefied petroleum gas as energy sources. It converts chemical energy into thermal energy through combustion, thereby heating water or generating steam. Its core working components include a burner, furnace, heat exchange system, and control system. Air is sent into the burner through the air inlet pipe, mixed with fuel precisely supplied through the gas valve, and then ignited. The resulting high-temperature flue gas flows through the heat exchange surface, transferring heat to the water medium. Precise adjustment of the air intake is crucial to ensuring complete combustion of fuel, improving thermal efficiency, controlling pollutant emissions, and ensuring operational safety.

[0003] Traditional intake regulation mainly relies on mechanical dampers driven by independent electric actuators or stepper motors, and uses electronic feedback such as oxygen sensors and flow meters to form a closed-loop control. Although this solution can achieve basic regulation, the reliability of electronic sensors and complex control circuits is significantly reduced in the high-temperature, vibration and humid environment of boiler operation over a long period of time, resulting in a high failure rate. In addition, the system occupies a large space and has high manufacturing and maintenance costs. Furthermore, the adjustment range of traditional mechanical dampers is limited and difficult to finely adjust. Existing electronic dampers require additional structure and assembly, increasing the space occupied and the number of electronic control components, which also increases the initial commissioning time and the later maintenance and operating costs.

[0004] In view of the above, this application is hereby submitted. Summary of the Invention

[0005] The purpose of this invention is to provide a low-NOx burner for a gas-fired boiler that facilitates adjustment of the air intake volume, in order to solve the problems mentioned in the background art.

[0006] To solve the above-mentioned technical problems, the present invention provides a low-NOx burner for a gas boiler that is easy to adjust the intake air volume, including a motor, an intake pipe and a drive mechanism. An adjustment mechanism is provided inside the intake pipe. The drive mechanism includes a fixed disk that is coaxially fixed with the output shaft of the motor. The outer edge of the side wall of the fixed disk is provided with a plurality of fixed frames arranged in a circumferential array. A counterweight is slidably arranged in each fixed frame. Each of the counterweight blocks is connected to a telescopic rod one on the side near the axis of the fixed disk. The fixed ends of multiple telescopic rods one are connected to the same support block. A telescopic rod two is horizontally fixed on the side wall of the support block away from the motor. The telescopic end of the telescopic rod two is connected to a screw rod. The outer arc wall of the telescopic rod one and the outer arc wall of the telescopic rod two are connected to the same fixed pipe. The adjustment mechanism includes a housing coaxially disposed inside the intake pipe, and a connecting cylinder is coaxially rotatably disposed on the side of the housing near the drive mechanism. The inner arc wall of the connecting cylinder is provided with a plurality of limiting posts arranged in a ring array about its axial direction and extending radially thereon on the side near the screw rod. Inside the housing, on the side closest to the drive mechanism, there is a coaxially rotating annular gear disk that is fixedly connected to the connecting cylinder. On the side of the annular gear disk away from the drive mechanism, there are multiple bevel gears that are evenly spaced along its circumference. On the side wall of the bevel gear away from the inside of the housing, there is a blade unit that is coaxially connected.

[0007] Furthermore, the length direction of the fixed frame is consistent with the radial direction of the fixed disk. A fixed cylinder is coaxially fixed at the center of the side wall of the fixed disk away from the motor. The end of the fixed cylinder away from the fixed disk is coaxially fixed to the housing. The end of the telescopic rod away from the counterweight passes through the fixed frame and the fixed cylinder to the inside of the fixed cylinder. The support block is coaxially disposed inside the fixed cylinder. A filter screen is provided in the air intake pipe on the side of the adjustment mechanism away from the drive mechanism. A fixed frame that can slide along the axial direction of the air intake pipe is coaxially connected to the side wall of the filter screen away from the drive mechanism. The end of the spiral rod away from the motor passes through the housing and is fixedly connected to the middle of the fixed frame. One end of the fixed tube is connected to the outer arc wall of the telescopic rod away from the axis of the fixed disk, and the other end is fixed to the outer arc wall of the telescopic rod near the support block.

[0008] Furthermore, multiple spiral plates arranged in a ring array about its axial direction are fixed on the outer arc wall of the spiral rod. The multiple spiral plates correspond one-to-one with the multiple limiting posts and slide against each other. A support rod is coaxially rotatably connected to the side wall of the bevel gear near the inside of the housing. The ends of the multiple support rods away from the bevel gear are rotatably connected to the same fixing ring. The fixing ring is coaxially fixed to the inner wall of the housing away from the driving mechanism. The blade as a whole includes a storage cylinder coaxially fixed with the bevel gear. Blades are provided on both sides of the outer arc wall of the fixing cylinder along its radial direction. The blade as a whole is fan-shaped. When the blades on the multiple blades as a whole are in the same vertical plane, the ends of the multiple blades as a whole abut against each other. An adjustment mechanism two is provided in the storage cylinder of the blade as a whole. The adjustment mechanism two includes an annular toothed disk two coaxially rotatably arranged on the side wall of the bevel gear away from the inside of the housing. The side of the annular toothed disk two away from the bevel gear two is engaged with the bevel gear two.

[0009] Furthermore, multiple cleaning strips are rotatably arranged on the outer wall of the storage tube on the blade as a whole along the axial length direction. A transmission gear is fixed at the center of the side wall of each cleaning strip near the storage tube and the transmission gear is arranged inside the storage tube. The multiple transmission gears are rotatably connected to the same rotating connecting rod on the same side of the bevel gear near the inside of the storage tube. A slider is rotatably arranged at the center of the side wall of the blade whole away from the bevel gear and slides on the inner arc wall of the air intake pipe.

[0010] Compared with the prior art, the beneficial effects of the present invention are: 1. By combining motor speed control with damper opening and closing control, when the motor speed increases, centrifugal force drives the counterweight to move outward, which in turn pushes the screw rod to move axially through telescopic rod one, fixed pipe, and telescopic rod two. The screw rod cooperates with the limit post to convert linear motion into rotation of the ring gear disk one, thereby driving all blades to change their deflection angle synchronously. This not only eliminates the need for sensors and complex circuits, reducing the system's footprint and manufacturing cost, but also allows for stepless adjustment of the air intake volume in real time according to air intake requirements, meeting different air intake needs.

[0011] 2. When the blade as a whole drives the ring toothed disk to rotate to change the tilt angle, it will simultaneously drive the entire filter screen to adaptively slide and avoid the air intake pipe along the axial direction. At the same time, through the adjustment mechanism, while the blade deflects, it will drive multiple cleaning strips set on the blade surface to rotate to the tilt, which avoids wind resistance and guides the airflow to be more in line with the blade profile, reducing eddies and flow separation, thereby reducing aerodynamic resistance and improving intake efficiency.

[0012] 3. When the motor is at low speed or in standby mode, the centrifugal force is minimal, and the blades will be spliced ​​into a complete ring under the reset mechanism, effectively sealing the air intake pipe. This not only prevents dust, insects and other impurities from entering when the boiler is not working, reducing the burden on the downstream filter screen and extending its maintenance cycle, but also assists in cleaning the filter screen. Attached Figure Description

[0013] Figure 1 A schematic diagram of the overall structure of a low-NOx burner for a gas-fired boiler that facilitates adjustment of the air intake volume; Figure 2 This is a schematic diagram of the internal structure of the air inlet pipe in a low-NOx burner of a gas-fired boiler that facilitates adjustment of the air intake volume. Figure 3 This is a schematic diagram showing the connection relationship between the motor and the drive mechanism in a low-NOx burner of a gas-fired boiler that facilitates adjustment of the air intake volume. Figure 4 This is a partial structural cross-sectional view of the drive mechanism in a low-NOx burner of a gas-fired boiler, which facilitates the adjustment of the air intake volume. Figure 5 This is a schematic diagram showing the positional relationship between the drive mechanism and the filter screen in a low-NOx burner of a gas-fired boiler that facilitates adjustment of the air intake volume. Figure 6 An exploded view of a partial structure of the regulating mechanism 1 in a low-NOx burner of a gas-fired boiler that facilitates the adjustment of the air intake. Figure 7 This is a schematic diagram of the overall structure of the blades in a low-NOx burner of a gas-fired boiler that facilitates adjustment of the air intake. Figure 8This is a schematic diagram of the regulating mechanism 2 in a low-NOx burner of a gas-fired boiler that facilitates the adjustment of the air intake volume; Figure 9 This is a schematic diagram of the structure of the regulating mechanism of a low-NOx burner in a gas-fired boiler after the inner blades have rotated as a whole.

[0014] In the diagram: 10. Motor; 11. Intake pipe; 111. Filter screen; 112. Fixing frame; 12. Fixing disc; 121. Support block; 13. Fixing frame; 14. Telescopic rod one; 141. Counterweight block; 15. Fixing pipe; 16. Telescopic rod II; 17. Helical rod; 20. Housing; 201. Limiting post; 21. Ring gear disc one; 22. Bevel gear one; 221. Support rod; 23. Blade assembly; 231. Slider; 30. Ring gear two; 31. Bevel gear two; 32. Rotating connecting rod; 33. Transmission gear; 34. Cleaning strips. Detailed Implementation

[0015] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0016] Please see the appendix Figure 1 To be continued Figure 9 The present invention provides a technical solution including a motor 10, an air intake pipe 11 and a drive mechanism. An adjustment mechanism is provided inside the air intake pipe 11. The drive mechanism includes a fixed disk 12 that is coaxially fixed with the output shaft of the motor 10. The outer edge of the side wall of the fixed disk 12 is provided with a plurality of fixed frames 13 arranged in a circumferential array. A counterweight block 141 is slidably arranged in each of the fixed frames 13. Each of the counterweight blocks 141 is connected to a telescopic rod 14 on one side near the axis of the fixed disk 12. The fixed ends of the multiple telescopic rods 14 are connected to the same support block 121. A telescopic rod 2 16 is horizontally fixed on the side wall of the support block 121 away from the motor 10. The telescopic end of the telescopic rod 2 16 is connected to a screw rod 17. The outer arc wall of the telescopic rod 14 and the outer arc wall of the telescopic rod 2 16 are connected to the same fixed tube 15. The adjustment mechanism includes a housing 20 coaxially disposed inside the intake pipe 11. A connecting cylinder is coaxially rotatably disposed on the side of the housing near the drive mechanism. Multiple limiting posts 201 extending radially about the spiral rod 17 are provided on the inner arc wall of the connecting cylinder on the side near the spiral rod 17. Inside the housing 20, on the side near the drive mechanism, there is a coaxially rotating annular gear disk 21, which is fixedly connected to the connecting cylinder. On the side of the annular gear disk 21 away from the drive mechanism, there are multiple bevel gears 22 that are evenly distributed along its circumference. On the side wall of the bevel gear 22 away from the inside of the housing 20, there is a blade integral 23 coaxially connected.

[0017] It should be noted that: the drive mechanism is used to sense the speed of the motor 10 and then control the opening degree of the adjustment mechanism 1; the support block 121 is coaxially arranged in the fixed cylinder and coaxially fixed on the fixed plate 12, which is used to provide support for the telescopic rod 14 and to provide an installation position for the telescopic rod 2 16. A storage channel is provided on the outer arc wall of the fixed cylinder at the position corresponding to the position of the telescopic rod 14, and the telescopic rod 14 passes through the storage channel into the fixed cylinder. The vertical cross section of the fixed frame 13 along the radial direction of the fixed plate 12 is "door" shaped and the notch is set towards the storage channel on the outer arc wall of the fixed cylinder. The counterweight 141 only slides within the fixed frame 13 and will not slip off the storage channel.

[0018] Please see the appendix Figure 1 To be continued Figure 9 The present invention provides a technical solution: the length direction of the fixed frame 13 is consistent with the radial direction of the fixed plate 12, a fixed cylinder is coaxially fixed at the center of the side wall of the fixed plate 12 away from the motor 10, the end of the fixed cylinder away from the fixed plate 12 is coaxially fixed to the housing 20, the end of the telescopic rod 14 away from the counterweight block 141 passes through the fixed frame 13 and the fixed cylinder to the inside of the fixed cylinder, and the support block 121 is coaxially disposed inside the fixed cylinder; A filter 111 is provided inside the air intake pipe 11 on the side of the adjustment mechanism away from the drive mechanism. A fixed frame 112 that can slide along the axial direction of the air intake pipe 11 is coaxially connected to the side wall of the filter 111 away from the drive mechanism. The end of the spiral rod 17 away from the motor 10 passes through the housing 20 and is fixedly connected to the middle of the fixed frame 112. One end of the fixed tube 15 is connected to the outer arc wall of the telescopic rod 14 away from the axis of the fixed plate 12, and the other end is fixed to the outer arc wall of the telescopic rod 16 near the support block 121.

[0019] It should be noted that the structures of telescopic rod 14 and telescopic rod 2 16 are similar, both being piston-like structures. Taking telescopic rod 14 as an example, it includes a piston rod 1 fixed to the counterweight 141 and a piston cylinder 1 fixed to the support block 121. The piston cylinder is pre-filled with pressurized inert gas. A return spring is coaxially sleeved on the outside of the piston rod 1 for easy reset. The fixing tube 15 connects the interior of telescopic rod 14 and telescopic rod 2 16, as detailed below. Figure 4 As shown, the piston rod 2 inside the further telescopic rod 16 has a rectangular cross-section to prevent it from rotating. When the speed of motor 10 increases to a sufficiently fast speed, it drives the fixed disk 12 to rotate, which in turn drives the housing 20 to rotate synchronously through the fixed cylinder. At the same time, the fixed disk 12 rotates rapidly and, under the action of centrifugal force, the counterweight 141 slides along the fixed frame 13 away from the center of the fixed disk 12, and pulls the telescopic rod 14 to press the gas inside it into the telescopic rod 16 through the fixed pipe 15, pushing the telescopic rod 16 and the spiral rod 17 at its end to extend axially toward the housing 20. It is understandable that the counterweight 141 has a relatively large mass, so that its centrifugal force under high-speed rotation is large enough to overcome the elastic force of the return spring and pull the telescopic rod 14.

[0020] Please see the appendix Figure 1 To be continued Figure 9 The present invention provides a technical solution: a plurality of spiral plates are fixed on the outer arc wall of the spiral rod 17 in a ring array about its axial direction. The plurality of spiral plates correspond one-to-one with the plurality of limiting posts 201 and slide against each other. A support rod 221 is coaxially rotatably connected to the side wall of the bevel gear 22 near the inside of the housing 20. The ends of the plurality of support rods 221 away from the bevel gear 22 are rotatably connected to the same fixing ring. The fixing ring is coaxially fixed to the inner wall of the housing 20 on the side away from the driving mechanism.

[0021] It should be noted that: the spiral rod 17 slides against the limiting post 201 inside the connecting cylinder through the spiral groove on its surface, forcing the connecting cylinder to rotate, thus converting the linear motion into the rotational motion of the connecting cylinder and the coaxially fixed annular toothed disc 21. That is, after the spiral plate on the spiral rod 17 slides against the limiting post 201, the piston rod 2 in the telescopic rod 26 has a rectangular cross section, which forces the connecting cylinder to rotate. The pitch of the spiral plate is large enough to make the limiting post 201 slide along its outer arc surface to achieve rotation. The same applies when moving in the opposite direction. The annular gear disk 21 drives multiple bevel gears 22 meshing with it to rotate synchronously, thereby causing the blade assembly 23 connected to the shaft end of each bevel gear 22 to deflect. This allows the housing 20 to drive the multiple blade assemblies 23 to draw in airflow. At this time, the seal on the intake pipe 11 is released, and the equivalent cross-sectional area of ​​the intake channel is increased. The specific structure is as follows: Figure 9 As shown, this achieves real-time matching between air intake and combustion demand, eliminating the need for complex sensors and other components; A rotating channel is provided on the outer arc wall of the housing 20 at the position corresponding to the bevel gear 22, which is used to install the blade assembly 23 and its storage tube and other components.

[0022] Please see the appendix Figure 1 To be continued Figure 9The present invention provides a technical solution: the blade assembly 23 includes a storage cylinder coaxially fixed with the bevel gear 22, and blades are provided on both sides of the outer arc wall of the fixed cylinder along its radial direction. The blade assembly 23 is a fan-shaped ring. When the blades on multiple blade assemblies 23 are in the same vertical plane, the ends of multiple blade assemblies 23 abut against each other. The storage tube on the blade assembly 23 is provided with an adjustment mechanism 2. The adjustment mechanism 2 includes an annular toothed disk 30 coaxially rotatably disposed on the side wall of the bevel gear 22 away from the interior of the housing 20. The side of the annular toothed disk 30 away from the bevel gear 22 is engaged with a bevel gear 31. Multiple cleaning strips 34 are rotatably arranged on the outer wall of the storage tube on the blade assembly 23 along the axial length direction. A transmission gear 33 is fixed at the center of the side wall of each cleaning strip 34 near the storage tube and the transmission gear 33 is arranged inside the storage tube. The multiple transmission gears 33 are rotatably connected to the same rotating connecting rod 32 on the same side of the bevel gear 22 near the inside of the storage tube. A slider 231 is rotatably arranged at the center of the side wall of the blade assembly 23 away from the bevel gear 22. The slider 231 slides on the inner arc wall of the air intake pipe 11.

[0023] It should be noted that: the extension of the telescopic rod 16 drives the fixed frame 112 and the filter screen 111 fixed thereto to slide and avoid each other along the axial direction of the air intake pipe 11 via the screw rod 17. Furthermore, the annular toothed disc 21 has an avoidance channel along its axis. The end of the screw rod 17 is fixed with a push rod to facilitate connection with the fixed frame 112, thus pushing the filter screen 111 to slide. In addition, the outer wall of the fixed frame 112 is embedded with balls to reduce the friction during sliding. Meanwhile, the annular toothed disc 30 in the second adjustment mechanism is fixedly set in the rotation channel to enhance stability. It is understood that the outer arc wall of the storage tube has a clearance opening at the end near the bevel gear 22 to facilitate the installation of the annular toothed disc 30. The rotation of bevel gear 22 drives the storage cylinder, which in turn drives bevel gear 31 and transmission gear 33 within it to revolve. Bevel gear 31 meshes with the annular gear disc 30, generating rotation, which in turn rotates synchronously via the connecting rod 32. Ultimately, this drives the cleaning strips 34 on the surface of the blade assembly 23 to deflect accordingly. Specifically, as shown... Figure 7 As shown, the raised cleaning strip 34 is designed to prevent it from obstructing airflow. It is understandable that the rotating connecting rod 32, bevel gear 31, and transmission gear 33 are all eccentrically connected to each other, thus enabling power transmission. The multiple inclined cleaning strips 34 not only do not cause excessive obstruction, but also disrupt the laminar boundary layer of airflow, prompting the air to change from laminar to turbulent flow in advance. Turbulence has a stronger mixing capacity, which can make the energy and momentum exchange between the air and the blades more complete, thereby improving the working efficiency of the fan to a certain extent and increasing the air volume and air pressure of the fan. Furthermore, when air flows over the blades, the inclined cleaning strip 34 can also act as a "guide", directing the air to flow more smoothly along the blade surface, delaying or reducing the occurrence of flow separation, which to some extent helps to improve the performance of the fan and reduce the noise level. When the speed of motor 10 decreases, the centrifugal force weakens, and the counterweight 141 returns to its original position under the action of the resetting mechanism of telescopic rod 14. The system pressure is released, and telescopic rod 16 and screw rod 17 retract. Under the reverse action, the blade assembly 23 rotates back to the state of mutual splicing. Figure 2 As shown, reseal the intake pipe 11; Furthermore, the cleaning strip 34 makes frictional contact with the filter screen 111 when rotating at low speed, which can also help to perform simple cleaning of the filter screen 111 and reduce the maintenance frequency of the filter screen 111 to a certain extent. The slider 231 is used to provide support for the blade assembly 23, bear the cantilever bending moment generated by the airflow, provide remote support for the blade, ensure that it maintains a stable deflection angle under high airflow load, and prevent vibration and deformation.

[0024] Working principle: When the boiler load increases, the speed of motor 10 increases, driving the fixed disk 12, which is coaxially fixed with its output shaft, to rotate at high speed. Under the action of centrifugal force, the counterweight block 141 on the fixed disk 12 slides outward along the radial fixed frame 13, pulling the piston rod of the telescopic rod 14 connected to it. The pressurized medium inside the multiple telescopic rods 14 is squeezed into the cylinder of the telescopic rod 16 through the fixed pipe 15, pushing the piston rod of the telescopic rod 16 and the spiral rod 17 at its end to extend axially towards the housing 20. The spiral plate on the outer wall of the spiral rod 17 slides and engages with the limiting post 201 on the inner wall of the connecting cylinder coaxially located in the intake pipe 11, forcing the axial linear motion of the spiral rod 17 into the rotational motion of the connecting cylinder. The connecting cylinder drives the annular gear disk 21, which is fixed coaxially with it, to rotate synchronously in the housing 20. The annular gear disk 21 drives multiple circumferentially distributed bevel gears 22 that mesh with it to rotate around their respective axes. The rotation of each bevel gear 22 is directly transmitted to the blade assembly 23, which is fixed coaxially with it, causing it to deflect from the closed state of mutual splicing, thereby changing the grid angle formed by multiple blades, increasing the effective flow area of ​​the intake air, and realizing real-time matching of air volume and combustion demand. At the same time, the extension of the spiral rod 17 pushes the fixed frame 112 and the filter screen 111 to slide and avoid along the axial direction of the air intake pipe 11, providing space for the blade to rotate. When the blade as a whole 23 deflects, the bevel gear 22 in its built-in adjustment mechanism 2 drives the storage cylinder to revolve. The bevel gear 31 in the storage cylinder meshes with the fixed ring gear 30 and generates its own rotation. Through the rotating connecting rod 32, all transmission gears 33 are driven, and finally the cleaning strip 34 is adjusted to the tilt angle of the optimized airflow. When the speed of motor 10 decreases, the centrifugal force weakens, the counterweight 141 returns to its original position under the action of the return spring of telescopic rod 14, the system pressure is released, the telescopic rod 16 drives the screw rod 17 to retract, and under the reverse action of the screw pair, the connecting cylinder rotates in the opposite direction, driving the blade assembly 23 to rotate to a fully closed state, resealing the air intake pipe 11, and completing a complete working cycle.

Claims

1. A low-NOx burner for a gas-fired boiler with easily adjustable air intake, comprising a motor (10), an air intake pipe (11), and a drive mechanism, wherein an adjustment mechanism is provided inside the air intake pipe (11), characterized in that: The drive mechanism includes a fixed disk (12) that is coaxially fixed to the output shaft of the motor (10). The outer edge of the side wall of the fixed disk (12) is provided with a plurality of fixed frames (13) arranged in a circumferential array. Each fixed frame (13) is slidably provided with a counterweight (141). Each of the counterweights (141) is connected to a telescopic rod (14) on the side of the fixed disk (12) near the axis. The fixed ends of the multiple telescopic rods (14) are connected to the same support block (121). The side wall of the support block (121) away from the motor (10) is horizontally fixed with a telescopic rod (16). The telescopic end of the telescopic rod (16) is connected to a screw rod (17). The outer arc wall of the telescopic rod (14) and the outer arc wall of the telescopic rod (16) are connected to the same fixed pipe (15). The adjustment mechanism includes a housing (20) coaxially disposed in the air intake pipe (11), and a connecting cylinder is coaxially rotatably disposed on the side near the drive mechanism. The inner arc wall of the connecting cylinder is provided with a plurality of limiting posts (201) arranged in a ring array about its axial direction and extending radially thereon on the side near the spiral rod (17). Inside the housing (20), on the side near the drive mechanism, there is a ring gear disk (21) that rotates coaxially and is fixedly connected to the connecting cylinder. On the side away from the drive mechanism, there are multiple bevel gears (22) that are evenly distributed along its circumference. On the side wall away from the inside of the housing (20), there is a blade assembly (23) that is coaxially connected.

2. The low-NOx burner for a gas-fired boiler with easily adjustable air intake as described in claim 1, characterized in that: The length direction of the fixed frame (13) is consistent with the radial direction of the fixed plate (12). A fixed cylinder is coaxially fixed at the center of the side wall of the fixed plate (12) away from the motor (10). The end of the fixed cylinder away from the fixed plate (12) is coaxially fixed to the housing (20). The end of the telescopic rod (14) away from the counterweight (141) passes through the fixed frame (13) and the fixed cylinder and is set inside the fixed cylinder. The support block (121) is coaxially set inside the fixed cylinder.

3. The low-NOx burner for a gas-fired boiler with easily adjustable air intake as described in claim 1, characterized in that: The air intake pipe (11) is provided with a filter screen (111) on the side of the adjustment mechanism away from the drive mechanism. The side wall of the filter screen (111) away from the drive mechanism is coaxially connected to a fixed frame (112) that can slide along the axial direction of the air intake pipe (11). The end of the spiral rod (17) away from the motor (10) passes through the housing (20) and is fixedly connected to the middle of the fixed frame (112). One end of the fixed tube (15) is connected to the outer arc wall of the telescopic rod (14) away from the axis of the fixed plate (12), and the other end is fixed to the outer arc wall of the telescopic rod (26) near the support block (121).

4. A low-NOx burner for a gas-fired boiler with easily adjustable air intake as described in claim 1, characterized in that: Multiple spiral plates are fixed on the outer arc wall of the spiral rod (17) in a ring array about its axis. The multiple spiral plates correspond one-to-one with the multiple limiting posts (201) and slide against each other. A support rod (221) is coaxially rotatably connected to one side wall of the bevel gear (22) near the inside of the housing (20). The ends of the multiple support rods (221) away from the bevel gear (22) are rotatably connected to the same fixing ring. The fixing ring is coaxially fixed to the inner wall of the housing (20) away from the driving mechanism.

5. A low-NOx burner for a gas-fired boiler with easily adjustable air intake as described in claim 1, characterized in that: The blade assembly (23) includes a storage tube that is coaxially fixed with the bevel gear (22). The outer arc wall of the fixed tube is provided with blades on both sides of its radial direction. The blade assembly (23) is a fan-shaped ring. When the blades on multiple blade assemblies (23) are in the same vertical plane, the ends of multiple blade assemblies (23) abut against each other.

6. A low-NOx burner for a gas-fired boiler with easily adjustable air intake as described in claim 5, characterized in that: The blade assembly (23) has an adjustment mechanism 2 inside the storage tube. The adjustment mechanism 2 includes an annular gear disk 2 (30) that is coaxially rotatably mounted on the side wall of the bevel gear 1 (22) away from the housing (20). The side of the annular gear disk 2 (30) away from the bevel gear 1 (22) is engaged with the bevel gear 2 (31).

7. A low-NOx burner for a gas-fired boiler with easily adjustable air intake as described in claim 6, characterized in that: Multiple cleaning strips (34) are rotatably arranged on the outer wall of the storage tube on the blade assembly (23) along the axial length direction. Each cleaning strip (34) has a transmission gear (33) fixed at the center of one side wall of the storage tube, and the transmission gear (33) is arranged inside the storage tube. The multiple transmission gears (33) and bevel gear (22) are rotatably connected to the same rotating connecting rod (32) on the same side of the storage tube.

8. A low-NOx burner for a gas-fired boiler with easily adjustable air intake as described in claim 1, characterized in that: A slider (231) is rotatably provided at the center of the side wall away from the bevel gear (22) of the blade (23), and the slider (231) slides on the inner arc wall of the intake pipe (11).

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