A burner smoke backflow device

Abstract

This application relates to a burner flue gas recirculation device, belonging to the technical field of burner technology. It includes a combustion outer cylinder, with an anti-backflow connecting pipe fixedly connected to the outside of the combustion outer cylinder. An adjustment mechanism is provided on the outside of the combustion outer cylinder, and an air inlet is fixedly connected to the top of the combustion outer cylinder. The adjustment mechanism includes a support frame, with a cylinder fixedly connected to the outside of the support frame. A sliding plate is fixedly connected to the drive end of the cylinder, and a sliding groove transmission hole is formed inside the sliding plate. A rotating component is disposed inside the transmission hole. This application efficiently converts the linear motion of the cylinder into the rotational action of the opening and closing plate, achieving stepless adjustment of the opening degree without a complex transmission mechanism. The coordinated rotation of the two opening and closing plates allows for flexible control of the flue gas passage area, thereby reducing combustion temperature, suppressing nitrogen oxide generation, and significantly improving combustion efficiency and environmental performance.

Description

Technical Field

[0001] This application relates to the field of burner technology, and in particular to a burner flue gas recirculation device. Background Technology

[0002] Against the backdrop of the "dual carbon" goal, the industrial sector has placed stringent demands on the energy efficiency and environmental performance of combustion equipment. As core equipment in industrial heating and power generation, burners generate nitrogen oxides and other pollutants during combustion, becoming a key factor restricting the industry's green development. Flue gas recirculation technology, with its significant advantages in reducing combustion temperature and suppressing nitrogen oxide formation, is gradually becoming an important direction for burner optimization and upgrading, making the development of efficient and reliable burner flue gas recirculation devices an urgent priority.

[0003] A search revealed Chinese patent publication number CN211502768U, which discloses a burner with flue gas recirculation function. The burner includes a combustion cylinder, a burner head located at the front end of the combustion cylinder, and a fan and gas valve assembly located at the rear end of the combustion cylinder. The gas valve assembly is equipped with a gas control device. An air inlet hood is provided at the air inlet of the fan, and the air inlet hood is equipped with an airflow regulating device. The air inlet hood is also equipped with a recirculation pipe connected to the boiler chimney, and a control butterfly valve is provided on the recirculation pipe. The control butterfly valve includes a servo motor, a valve stem connected to the output shaft of the servo motor, and a valve plate assembly rotatably connected to the recirculation pipe around the valve stem. This invention filters the flue gas generated in the boiler furnace before introducing it back into the burner, preventing ash accumulation inside the burner.

[0004] The aforementioned patent specification mentions that "when the flue gas generated in the boiler furnace is reintroduced into the burner, the flue gas is first filtered before being introduced into the burner, which can prevent ash accumulation inside the burner." While this does prevent ash accumulation inside the burner, the flue gas recirculation device shows significant shortcomings when dealing with variable load conditions. When the equipment load changes, it is difficult to accurately adjust the flue gas recirculation flow rate according to the real-time operating conditions. Excessive recirculation flow rate can lead to unstable combustion or even flameout. Therefore, a burner flue gas recirculation device is proposed to solve the above problems. Utility Model Content

[0005] The purpose of this application is to provide a burner flue gas recirculation device, which aims to improve the problem that some devices cannot adapt to variable load conditions.

[0006] The burner flue gas recirculation device provided in this application adopts the following technical solution:

[0007] A burner flue gas recirculation device includes a combustion outer cylinder, an anti-backflow connecting pipe fixedly connected to the outside of the combustion outer cylinder, an adjustment mechanism disposed on the outside of the combustion outer cylinder, an air inlet fixedly connected to the top of the combustion outer cylinder, an opening and closing mechanism disposed on the outside of the air inlet, a natural gas inlet fixedly connected to the outside of the combustion outer cylinder, a valve disposed in the middle of the outside of the natural gas inlet, an inner combustion cylinder fixedly connected to the inside of the combustion outer cylinder, a control mechanism disposed inside the inner combustion cylinder, the adjustment mechanism including a support frame, the support frame fixedly connected to the outside of the combustion outer cylinder, a cylinder fixedly connected to the outside of the support frame, a sliding plate fixedly connected to the driving end of the cylinder, a sliding groove transmission hole opened inside the sliding plate, and a rotating component disposed inside the transmission hole;

[0008] Through the above technical solution: During operation, natural gas enters the combustion chamber through the valve at the natural gas inlet, while air enters through the air inlet after being regulated by the opening and closing mechanism, and the two are initially mixed. The cylinder in the regulating mechanism drives a sliding plate to slide along the support frame. The sliding plate's groove transmission hole drives a rotating component to regulate the flue gas return flow. Part of the flue gas after combustion flows back through the anti-backflow connection pipe to mix with the fresh gas. Simultaneously, the control mechanism enhances the mixing effect within the combustion chamber, and the opening and closing mechanism precisely controls the air intake at the air inlet, effectively reducing the combustion temperature, suppressing nitrogen oxide generation, and improving combustion efficiency and environmental performance.

[0009] Preferably, the opening and closing mechanism includes a motor, which is fixedly connected to the outside of the combustion outer cylinder. A rotating disk is fixedly connected to the drive end of the motor, and a transmission connecting rod is rotatably connected to the outside of the rotating disk.

[0010] By adopting the above technical solution, during operation, motor 1 is fixed outside the combustion cylinder. After being powered on, it drives rotating disk 1 to rotate. Rotating disk 1 converts the rotational motion into linear motion through the transmission linkage, pulling the transmission bar. The transmission bar is rotatably connected to multiple connecting blocks, causing the rotating opening and closing fan on the connecting blocks to rotate synchronously. When it is necessary to increase the air intake, motor 1 rotates forward, and the rotating opening and closing fan opens outward, increasing the flow area of ​​the air intake. Conversely, motor 1 rotates in reverse, and the rotating opening and closing fan closes, reducing the air intake, improving combustion efficiency and reducing pollutant emissions.

[0011] Preferably, the rotating assembly includes a rotating shaft, an externally protruding shaft of the rotating shaft is slidably connected to the inside of the transmission hole, a rotating collar is rotatably connected to the outside of the rotating shaft, and a rotating opening and closing plate is fixedly connected to the outside of the rotating shaft.

[0012] By adopting the above technical solution, when the adjustment mechanism is working, the cylinder drives the sliding plate to slide along the support frame, and the transmission hole of the sliding plate moves accordingly. Because the external protruding shaft of the rotating shaft is slidably connected in the transmission hole, the displacement of the transmission hole causes the rotating shaft to rotate around its own axis, thereby causing the second rotating opening and closing plate fixed outside the rotating shaft to rotate synchronously. At the same time, the rotating collar rotatably connected to the outside of the rotating shaft will also drive the first rotating opening and closing plate fixed outside it to rotate. When it is necessary to increase the flue gas recirculation flow, the cylinder retracts and pulls the sliding plate, and the transmission hole causes the first and second rotating opening and closing plates to rotate and open synchronously, expanding the channel area of ​​the anti-backflow connection pipe. Conversely, the cylinder extends and pushes the sliding plate, and the two opening and closing plates close to reduce the recirculation flow and effectively suppress the generation of nitrogen oxides.

[0013] Preferably, the outer side of the second rotating opening and closing plate is slidably connected to the inside of the anti-backflow connecting pipe, the outer side of the rotating collar is fixedly connected to the first rotating opening and closing plate, the outer side of the first rotating opening and closing plate is slidably connected to the inside of the anti-backflow connecting pipe, and the outer side of the sliding plate is slidably connected to the inside of the support frame.

[0014] By adopting the above technical solution, when the cylinder drives the sliding plate to slide within the support frame, the sliding plate drives the rotating component that cooperates with it to move. The rotating collar and rotating shaft rotate accordingly, respectively driving the rotating opening and closing plate one and rotating opening and closing plate two fixed on it to slide and rotate inside the anti-backflow connecting pipe. When it is necessary to increase the flue gas backflow, the cylinder retracts, pulling the sliding plate to move towards the cylinder. The rotating opening and closing plate one and rotating opening and closing plate two rotate and open synchronously within the anti-backflow connecting pipe, expanding the channel area. When it is necessary to reduce the backflow, the cylinder extends, pushing the sliding plate to move in the opposite direction. The rotating opening and closing plate one and rotating opening and closing plate two rotate and close, reducing the channel area. This achieves precise control of the flue gas backflow, effectively improving combustion efficiency and reducing nitrogen oxide emissions.

[0015] Preferably, a transmission bar is rotatably connected to the other end of the transmission link, a plurality of connecting blocks are rotatably connected to the outside of the transmission bar, a rotating opening and closing fan is fixedly connected to the outside of the connecting blocks, and the rotating opening and closing fan is slidably connected to the outside of the air inlet.

[0016] By adopting the above technical solution, when the motor drives the rotating disk to rotate, the transmission link connected to it swings accordingly. The other end of the transmission link drives the transmission bar to perform linear reciprocating motion. During the movement of the transmission bar, power is transmitted to the rotating opening and closing fan through multiple connecting blocks connected to it. When the transmission bar moves to one side, it pulls the connecting block, causing the rotating opening and closing fan to rotate outward around the hinge point as an axis outside the air inlet, increasing the ventilation area of ​​the air inlet and increasing the air intake. When the transmission bar moves in the opposite direction, it pushes the connecting block, causing the rotating opening and closing fan to rotate inward and close, reducing the ventilation area of ​​the air inlet and decreasing the air intake.

[0017] Preferably, the control mechanism includes a fixed shaft, the fixed shaft is externally fixedly connected to the inside of the combustion cylinder, the fixed shaft is externally fixedly connected to a housing, and the housing is externally fixedly connected to a motor.

[0018] By adopting the above technical solution, the second motor is fixed to the outside of the outer shell, and the outer shell is stably connected to the inside of the combustion cylinder through a fixed shaft. When the second motor is started, its output power drives the internal components connected to the drive end to operate. Under the stable support provided by the fixed shaft, the relevant transmission structure inside the outer shell transmits and converts the power of the second motor, thereby realizing the control functions such as disturbance or mixing of the fluid in the combustion cylinder.

[0019] Preferably, the drive end of the second motor is fixedly connected to a second rotating disk, and a plurality of toothed rings are fixedly connected to the outside of the second rotating disk, which is rotatably connected to the inside of the outer casing.

[0020] By adopting the above technical solution, when the second motor is powered on and started, its drive end drives the second rotating disk to start rotating inside the outer shell. Multiple toothed rings fixed to the outside of the second rotating disk rotate synchronously. The rotation of the toothed rings transmits power to other meshing transmission components, thereby driving the movement of related structures inside the combustion cylinder, realizing the functions of stirring and mixing the fluid inside the cylinder.

[0021] Preferably, the housing is internally connected to multiple drive shafts, one end of each drive shaft is fixedly connected to a drive gear, the external teeth of the drive gear mesh with the external teeth of the gear ring, and a fan blade is fixedly connected to the external side of the drive shaft.

[0022] By adopting the above technical solution, when the second motor drives the second rotating disk to rotate, the gear ring fixed outside the second rotating disk rotates accordingly. The transmission gear meshing with the gear ring drives the transmission shaft to rotate inside the outer casing. The fan blades fixed outside the transmission shaft rotate synchronously. The rotation of the fan blades causes the gas in the combustion cylinder to form forced turbulence, which accelerates the mixing of natural gas, air and return flue gas. Through the meshing transmission of the gear ring and the transmission gear, multiple fan blades achieve synchronous and efficient operation, significantly improving the mixing uniformity, optimizing the combustion process, reducing local high temperature zones, and suppressing the generation of nitrogen oxides.

[0023] In summary, this application includes at least one of the following beneficial technical effects:

[0024] 1. The linear motion of the cylinder is efficiently converted into the rotational motion of the opening and closing plate. The opening degree can be infinitely adjusted without the need for a complex transmission mechanism. The coordinated rotation of the double opening and closing plate can flexibly control the flue gas passage area, effectively prevent flue gas backflow through the staggered sealing structure, ensure combustion safety, and optimize the flue gas recirculation ratio in real time, thereby reducing the combustion temperature, inhibiting the generation of nitrogen oxides, and significantly improving combustion efficiency and environmental performance.

[0025] 2. The mechanical transmission system, consisting of a moving disc, transmission link, and transmission bar, efficiently converts rotary motion into linear motion, thereby precisely controlling the synchronous action of multiple rotating and opening fans. This enables flexible and precise adjustment of the air inlet opening. The system is compact and highly stable, and can quickly respond to the air intake requirements of different working conditions. The multi-blade synchronous opening and closing mode can uniformly adjust the air intake flow and velocity, ensuring thorough mixing of air and fuel and improving combustion efficiency. Attached Figure Description

[0026] Figure 1 This is a three-dimensional schematic diagram of a burner flue gas recirculation device proposed in this utility model;

[0027] Figure 2 This is a schematic diagram of the transmission hole of a burner flue gas recirculation device proposed in this utility model;

[0028] Figure 3 This is a schematic diagram of the rotating opening and closing fan of a burner flue gas recirculation device proposed in this utility model;

[0029] Figure 4 for Figure 3 Enlarged view of point A in the middle;

[0030] Figure 5 This is a schematic diagram of the anti-backflow connection pipe of a burner flue gas backflow device proposed in this utility model;

[0031] Figure 6 for Figure 5 Enlarged view of point B in the middle;

[0032] Explanation of reference numerals in the attached drawings: 1. Combustion outer cylinder; 2. Anti-backflow connecting pipe; 3. Adjustment mechanism; 31. Support frame; 32. Cylinder; 33. Sliding plate; 34. Transmission hole; 35. Rotating assembly; 351. Rotating shaft; 352. Rotating collar; 353. Rotating opening and closing plate one; 354. Rotating opening and closing plate two; 4. Air inlet; 5. Natural gas inlet; 6. Opening and closing mechanism; 61. Motor one; 62. Rotating disk; 63. Transmission connecting rod; 64. Transmission bar; 65. Connecting block; 66. Rotating opening and closing fan; 7. Combustion inner cylinder; 8. Control mechanism; 81. Motor two; 82. Gear ring; 83. Rotating disk; 84. Transmission gear; 85. Outer shell; 86. Transmission shaft; 87. Fan blade. Detailed Implementation

[0033] The following is in conjunction with the appendix Figure 1 -Appendix Figure 6 This application will be described in further detail below.

[0034] Example: A burner flue gas recirculation device, referring to... Figure 1 and Figure 2 The system includes an outer combustion cylinder 1, which provides space for the internal combustion process and serves as a protective and heat-insulating element, isolating the internal high-temperature environment from the outside world to ensure the safe operation of the device. An anti-backflow connection pipe 2 is fixedly connected to the outside of the outer combustion cylinder 1. The anti-backflow connection pipe 2 is used to guide part of the flue gas generated by combustion back to the combustion area. At the same time, its structural design can prevent flue gas backflow, ensure unidirectional flow of flue gas, and maintain stable operation of the system.

[0035] An adjustment mechanism 3 is provided on the outside of the combustion outer cylinder 1. The adjustment mechanism 3 enables precise control of the flue gas return flow to adapt to different working conditions. An air inlet 4 is fixedly connected to the top of the combustion outer cylinder 1. The air inlet 4 is used to introduce fresh air into the combustion process and provide the oxygen required for combustion. An opening and closing mechanism 6 is provided on the outside of the air inlet 4. The opening and closing mechanism 6 is used to adjust the opening size of the air inlet 4, thereby controlling the air flow into the combustion outer cylinder 1 and adjusting the combustion intensity. A natural gas inlet 5 is fixedly connected to the outside of the combustion outer cylinder 1.

[0036] The natural gas inlet 5 is used as the input channel for natural gas to provide fuel for combustion. A valve is installed in the middle of the outside of the natural gas inlet 5. The valve is used to control the on / off state and flow rate of natural gas, which facilitates the start and stop of the equipment and the adjustment of combustion power. The combustion inner cylinder 7 is fixedly connected inside the combustion outer cylinder 1. The combustion inner cylinder 7 is equipped with a control mechanism 8. The control mechanism 8 enhances the mixing effect of the gas in the combustion inner cylinder 7, so that the fuel, air and flue gas are fully mixed, thereby improving combustion efficiency and reducing pollutant emissions.

[0037] The adjustment mechanism 3 includes a support frame 31, which provides support and guidance for the cylinder 32 and the sliding plate 33 to ensure the stability and accuracy of their movement. The support frame 31 is externally fixedly connected to the outside of the combustion outer cylinder 1. The cylinder 32 is externally fixedly connected to the support frame 31. The cylinder 32 provides driving force to the sliding plate 33 through telescopic movement, thereby controlling the opening of the flue gas return channel.

[0038] A sliding plate 33 is fixedly connected to the drive end of the cylinder 32. The sliding plate 33 slides along the support frame 31 under the drive of the cylinder 32. Its movement is transmitted to the rotating component 35 through the sliding groove transmission hole 34. The sliding plate 33 has a sliding groove transmission hole 34 inside. The rotating component 35 is installed inside the transmission hole 34. The rotating component 35 controls the opening of the channel in the anti-backflow connecting pipe 2 through rotational movement to adjust the flue gas backflow rate.

[0039] The rotating assembly 35 includes a rotating shaft 351, whose protruding shaft is slidably connected to the transmission hole 34. It rotates under the drive of the sliding plate 33, thereby driving the rotating opening and closing plate 354 to rotate. The external protruding shaft of the rotating shaft 351 is slidably connected to the inside of the transmission hole 34, and a rotating collar 352 is rotatably connected to the outside of the rotating shaft 351.

[0040] The rotating collar 352 can rotate independently relative to the rotating shaft 351, driving the rotating opening and closing plate 353 to move, and cooperating with the rotating opening and closing plate 354 to adjust the flue gas passage. The rotating opening and closing plate 354 is fixedly connected to the outside of the rotating shaft 351. The rotating opening and closing plate 354 is used to rotate inside the anti-backflow connecting pipe 2 under the drive of the rotating shaft 351, and adjust the opening of the flue gas passage by changing its own angle.

[0041] The external sliding connection of the rotating opening and closing plate 354 is inside the anti-backflow connecting pipe 2. The external fixed connection of the rotating collar 352 is the rotating opening and closing plate 353. The rotating opening and closing plate 353 rotates inside the anti-backflow connecting pipe 2 under the drive of the rotating collar 352. The external sliding connection column of the rotating opening and closing plate 353 is inside the anti-backflow connecting pipe 2. The external sliding connection of the sliding plate 33 is inside the support frame 31.

[0042] Specifically, during operation, natural gas enters the combustion chamber 7 through the valve controlled by the natural gas inlet 5, while air enters through the air inlet 4 and is regulated by the opening and closing mechanism 6. Motor 1 61 drives the rotating disk 1 62 to rotate, which in turn drives the transmission bar 64 to move linearly via the transmission connecting rod 63. This causes the rotating opening and closing fan 66 on the connecting block 65 to rotate, controlling the air intake. The cylinder 32 of the adjusting mechanism 3 drives the sliding plate 33 to slide along the support frame 31. The sliding groove transmission hole 34 of the sliding plate 33 drives the rotating shaft 351 to rotate, causing the rotating opening and closing plate 1 353 and the rotating opening and closing plate 2 354 to rotate synchronously within the anti-backflow connecting pipe 2, regulating the flue gas backflow rate. Motor 2 81 of the control mechanism 8 drives the rotating disk 2 83 and the gear ring 82 to rotate, which in turn drives the transmission shaft 86 and the fan blade 87 to rotate via the transmission gear 84, enhancing the mixing effect within the combustion chamber 7.

[0043] Reference Figure 1 , Figure 3 and Figure 4 The opening and closing mechanism 6 includes a motor 61, which drives the rotating disk 62 to rotate, thereby adjusting the opening of the air inlet 4. The motor 61 is externally fixedly connected to the outside of the combustion outer cylinder 1. The rotating disk 62 is fixedly connected to the drive end of the motor 61. The rotating disk 62 rotates under the drive of the motor 61, and the rotational motion is converted into the linear motion of the transmission bar 64 through the transmission link 63.

[0044] A transmission link 63 is rotatably connected to the outside of the rotating disk 62. The transmission link 63 is used to connect the rotating disk 62 and the transmission bar 64, and plays the role of transmitting power and converting motion. The transmission bar 64 is rotatably connected to the other end of the transmission link 63. The transmission bar 64 performs linear reciprocating motion under the drive of the transmission link 63, and drives the rotating opening and closing fan 66 to rotate through the connecting block 65. Multiple connecting blocks 65 are rotatably connected to the outside of the transmission bar 64. The rotating opening and closing fan 66 is fixedly connected to the outside of the connecting block 65. The rotating opening and closing fan 66 is slidably connected to the outside of the air inlet 4.

[0045] Specifically, during operation, after the motor 61 is powered on and started, it drives the rotating disk 62 to rotate. The rotating disk 62 converts the rotational motion into the linear reciprocating motion of the transmission bar 64 through the transmission link 63. The transmission bar 64 drives multiple connecting blocks 65 to move synchronously, so that the rotating opening and closing fan 66 fixed on the connecting block 65 rotates outside the air inlet 4, thereby realizing the adjustment of the opening degree of the air inlet 4. The motor 61 adopts a special motor that is resistant to high temperature and moisture, ensuring stable operation in high temperature environment.

[0046] Reference Figure 1 , Figure 5 and Figure 6 The control mechanism 8 includes a fixed shaft 88, which provides a stable mounting base for the outer casing 85 and the second motor 81 inside the combustion inner cylinder 7. The fixed shaft 88 is externally fixedly connected to the inside of the combustion inner cylinder 7, and the outer casing 85 is externally fixedly connected to the fixed shaft 88. The outer casing 85 provides installation and rotation space for components such as the second rotating disk 83 and the drive shaft 86. The second motor 81 is externally fixedly connected to the outer casing 85.

[0047] Motor 2 81 drives rotating disk 2 83 to rotate, providing power for gas mixing. The drive end of motor 2 81 is fixedly connected to rotating disk 2 83. Multiple gear rings 82 are fixedly connected to the outside of rotating disk 2 83. The gear rings 82 mesh with transmission gears 84 to transmit the rotational motion of rotating disk 2 83 to multiple transmission shafts 86, thereby realizing power distribution.

[0048] The external rotating disk 83 is rotatably connected to the inside of the housing 85. Multiple drive shafts 86 are rotatably connected inside the housing 85. The drive shafts 86 are used to rotate under the drive of the drive gear 84, and transmit power to the fan blades 87 to drive the fan blades 87 to rotate. The external end of the drive shaft 86 is fixedly connected to the drive gear 84. The drive gear 84 meshes with the gear ring 82, receives and transmits power, and drives the drive shaft 86 to rotate.

[0049] The external teeth of the transmission gear 84 are engaged with the external meshing of the gear ring 82. The external drive shaft 86 is fixedly connected with a fan blade 87. The fan blade 87 rotates at high speed under the drive of the drive shaft 86, stirring the gas in the combustion cylinder 7, promoting the full mixing of fuel, air and flue gas, and improving the combustion effect.

[0050] Specifically, during operation, motor 2 81 is powered on and drives rotating disk 2 83 to rotate inside housing 85. The gear ring 82 fixed to rotating disk 2 83 rotates accordingly. Through meshing with transmission gear 84, it transmits power to transmission shaft 86, which drives fan blade 87 on the shaft to rotate at high speed, powerfully agitating the fuel, air and flue gas in combustion cylinder 7 to achieve full mixing.

[0051] The implementation principle of this application embodiment is as follows: the flue gas recirculation adjustment is driven by the cylinder 32 to slide the sliding plate 33 along the support frame 31. The sliding plate 33's groove transmission hole 34 drives the protruding shaft of the rotating shaft 351 to slide, causing the rotating shaft 351 to rotate around its own axis. The rotating shaft 351 drives the rotating opening and closing plate 354 to rotate, and at the same time, the rotating collar 352 drives the rotating opening and closing plate 353 to rotate synchronously. The two form a certain opening degree in the anti-backflow connecting pipe 2. When it is necessary to increase the flue gas recirculation, the cylinder 32 retracts, and the sliding plate 33 moves towards the cylinder 32. Through the groove transmission hole 34, the rotating opening and closing plate 353 and the rotating opening and closing plate 354 rotate synchronously to open, increasing the flue gas passage area. Conversely, when the cylinder 32 extends, the sliding plate 33 moves in the opposite direction, and the two opening and closing plates close, reducing the recirculation flow.

[0052] Motor 61 drives rotating disk 62 to rotate. Rotating disk 62 pulls transmission bar 64 to move linearly through transmission link 63. Transmission bar 64 drives multiple rotating opening and closing fans 66 to rotate synchronously through connecting block 65. When it is necessary to increase the air intake, motor 61 rotates forward and rotating opening and closing fans 66 open outward. Conversely, they close, thereby adjusting the air intake 4. This, together with the valve inside the natural gas intake 5, precisely controls the mixing ratio.

[0053] The rotating disk 83 is driven to rotate by motor 81, and the gear ring 82 rotates accordingly. The gear ring 82 meshes with the transmission gear 84, driving multiple transmission shafts 86 to rotate synchronously. The fan blades 87 on the transmission shafts 86 rotate at high speed, forming forced turbulence in the combustion inner cylinder 7. The turbulence makes the natural gas, air and return flue gas fully mixed, improving combustion efficiency and reducing local high temperature zones.

[0054] The embodiments described in this specific implementation are preferred embodiments of this application and are not intended to limit the scope of protection of this application. Identical components are represented by the same reference numerals. Therefore, all equivalent changes made to the structure, shape, and principle of this application should be covered within the scope of protection of this application.

Claims

1. A burner flue gas recirculation device comprising a combustion outer cylinder (1), characterized in that, The outer combustion cylinder (1) is fixedly connected to the outside of a backflow prevention pipe (2), and an adjustment mechanism (3) is provided on the outside of the outer combustion cylinder (1). An air inlet (4) is fixedly connected to the top of the outer combustion cylinder (1), and an opening and closing mechanism (6) is provided on the outside of the air inlet (4). A natural gas inlet (5) is fixedly connected to the outside of the outer combustion cylinder (1), and a valve is provided in the middle of the outside of the natural gas inlet (5). An inner combustion cylinder (7) is fixedly connected to the inside of the outer combustion cylinder (1), and a control mechanism (8) is provided inside the inner combustion cylinder (7). The adjustment mechanism (3) includes a support frame (31), which is fixedly connected to the outside of the combustion outer cylinder (1). A cylinder (32) is fixedly connected to the outside of the support frame (31). A sliding plate (33) is fixedly connected to the driving end of the cylinder (32). A sliding groove transmission hole (34) is opened inside the sliding plate (33). A rotating component (35) is provided inside the transmission hole (34).

2. A burner flue gas recirculation device according to claim 1, wherein, The opening and closing mechanism (6) includes a motor (61), which is fixedly connected to the outside of the combustion outer cylinder (1). The drive end of the motor (61) is fixedly connected to a rotating disk (62), and a transmission connecting rod (63) is rotatably connected to the outside of the rotating disk (62).

3. A burner flue gas recirculation device according to claim 1, wherein, The rotating assembly (35) includes a rotating shaft (351), the outer protruding shaft of the rotating shaft (351) is slidably connected to the inside of the transmission hole (34), the outer side of the rotating shaft (351) is rotatably connected to a rotating collar (352), and the outer side of the rotating shaft (351) is fixedly connected to a rotating opening and closing plate (354).

4. A burner flue gas recirculation device according to claim 3, wherein, The external sliding connection of the second rotating opening and closing plate (354) is inside the anti-backflow connecting pipe (2), the external fixed connection of the rotating collar (352) is the first rotating opening and closing plate (353), the external sliding connection of the first rotating opening and closing plate (353) is inside the anti-backflow connecting pipe (2), and the external sliding connection of the sliding plate (33) is inside the support frame (31).

5. A burner flue gas recirculation device according to claim 2, wherein, The transmission link (63) is rotatably connected to the other end of the transmission bar (64), and multiple connecting blocks (65) are rotatably connected to the outside of the transmission bar (64). A rotating opening and closing fan (66) is fixedly connected to the outside of the connecting block (65), and the rotating opening and closing fan (66) is slidably connected to the outside of the air inlet (4).

6. A burner flue gas recirculation device according to claim 1, wherein, The control mechanism (8) includes a fixed shaft (88), which is fixedly connected to the outside of the combustion inner cylinder (7). A housing (85) is fixedly connected to the outside of the fixed shaft (88), and a motor (81) is fixedly connected to the outside of the housing (85).

7. A burner flue gas recirculation device according to claim 6, wherein, The drive end of the second motor (81) is fixedly connected to the second rotating disk (83), and multiple toothed rings (82) are fixedly connected to the outside of the second rotating disk (83). The outside of the second rotating disk (83) is rotatably connected to the inside of the outer shell (85).

8. A burner flue gas recirculation device according to claim 7, wherein, The housing (85) is rotatably connected to a plurality of drive shafts (86), and a drive gear (84) is fixedly connected to one end of the drive shaft (86). The external teeth of the drive gear (84) are meshed with the external teeth of the gear ring (82). A fan blade (87) is fixedly connected to the outside of the drive shaft (86).

Images