Environment-friendly natural gas boiler with flue gas backflow supplementary heating

Abstract

The application discloses an environmental-friendly natural gas boiler with flue gas backflow supplementary heating, which comprises a natural gas boiler body, a cleaning mechanism, a drag plate and a cleaning ring. The bottom of the natural gas boiler body is provided with a combustion mechanism, the top of the combustion mechanism is installed with a heating water tank, and the left side of the combustion mechanism is connected with the cleaning mechanism through an exhaust pipe. The environmental-friendly natural gas boiler with flue gas backflow supplementary heating is provided with the cleaning mechanism on the top of the natural gas boiler body, so that the flue gas discharged from the exhaust port can be filtered conveniently, the inside of the cleaning mechanism is provided with a cleaning plate, the surface of the second filter screen can be cleaned conveniently, the blockage of the second filter screen is avoided, the filtering effect is improved, then the filtered flue gas is conveyed into the combustion mechanism through an insulation pipe, so that the flue gas can be heated, and the flue gas can be utilized again.

Description

Technical Field

[0001] This invention relates to the field of natural gas boiler technology, specifically to an environmentally friendly natural gas boiler with flue gas recirculation supplementary heating. Background Technology

[0002] Natural gas boilers include gas-fired hot water boilers, gas-fired hot water boilers, and gas-fired steam boilers. Gas-fired hot water boilers are also called gas-fired heating boilers and gas-fired bathing boilers. As the name suggests, gas-fired boilers use natural gas as fuel. Compared to oil-fired and electric boilers, gas-fired boilers are the most economical, so most people choose them for steam, heating, and bathing. With the increasing maturity of natural gas boiler technology, the appearance of natural gas boilers has become more diverse, but their basic principle remains unchanged. However, the following problems still exist with commonly used natural gas boilers on the market:

[0003] 1. During the use of natural gas boilers, a large amount of flue gas is emitted, which contains a lot of heat. This means that the flue gas cannot be reused after it is discharged, resulting in a waste of resources. At the same time, the flue gas contains a lot of harmful gases and solid particles. If it is not filtered, it will cause pollution to the surrounding environment.

[0004] 2. After a long period of use, the inner wall of the water tank of a natural gas boiler needs to be cleaned. Generally, the boiler is stopped during cleaning, which reduces work efficiency. Also, the water inside the boiler needs to be drained after cleaning. Since there is a lot of water inside the boiler, draining it wastes water resources and increases cleaning costs.

[0005] Therefore, we propose an environmentally friendly natural gas boiler with flue gas recirculation supplementary heating to solve the problems mentioned above. Summary of the Invention

[0006] The purpose of this invention is to provide an environmentally friendly natural gas boiler with flue gas recirculation supplementary heating, to solve the problems mentioned above. Currently available environmentally friendly natural gas boilers with flue gas recirculation supplementary heating on the market produce a large amount of flue gas with significant heat during operation, making it unusable after discharge and resulting in resource waste. Furthermore, the flue gas contains numerous harmful gases and solid particles, which, if not filtered, pollute the surrounding environment. Additionally, after prolonged use, the inner wall of the water tank requires cleaning, typically requiring the boiler to be stopped, reducing efficiency. Moreover, the large volume of water inside the boiler after cleaning leads to wasteful water discharge and increased cleaning costs.

[0007] To achieve the above objectives, the present invention provides the following technical solution: an environmentally friendly natural gas boiler with flue gas recirculation supplementary heating, comprising a natural gas boiler body, a cleaning mechanism, a slide plate, and a cleaning ring. A combustion mechanism is located at the bottom of the natural gas boiler body, and a heating water tank is installed at the top of the combustion mechanism. The left side of the combustion mechanism is connected to the cleaning mechanism via a flue gas exhaust pipe, and the left side of the cleaning mechanism is connected to the combustion mechanism via an insulation pipe. A motor is installed at the top of the natural gas boiler body, and the main shaft at the bottom of the motor passes through the natural gas boiler body and is connected to the heating water tank. The surface of the main shaft contacts the slide plate via a nut. A first filter screen is provided inside the slide plate, and the bottom of the first filter screen contacts a blocking plate. The top of the blocking plate is connected to the slide plate via a limiting post, and the bottom of the blocking plate contacts a support post. The outer side of the cleaning ring is connected to a limiting post via a limiting strip. The positioning blocks are in contact with each other, and the limiting blocks are welded and fixed to the inner wall of the heating water tank. A half gear is installed on the top of the main shaft, and the left and right sides of the half gear are connected to the winding drum through speed-increasing gears. The surface of the winding drum is connected to one side of the tension rope, while the other side of the tension rope passes through the cleaning mechanism and is connected to the cleaning plate. The left side of the cleaning plate is connected to the cleaning mechanism through a telescopic spring, and the bottom of the cleaning plate is in contact with the second filter screen, which is located above the exhaust pipe. The interior of the cleaning mechanism is connected to the protective plate through a spiral spring, and a push block is provided on the top surface of the protective plate. A fixing block is installed inside the right side of the cleaning mechanism, and a power rod is provided inside the fixing block. A power gear is provided on the right side of the power rod. One side of the power gear is connected to the rack, and the right side of the rack is connected to the cleaning mechanism through a resistance spring. The right side of the rack is welded and fixed to the push rod.

[0008] Preferably, the front end of the main shaft is located inside the heating water tank, and the main shaft is threadedly connected to the slide plate by a nut. The slide plate is circular in top view, and the slide plate and the cleaning ring are an integrated structure.

[0009] Preferably, the slide plate is provided with a first filter screen at an equal angle, and the first filter screen is located directly above the blockage plate, and the first filter screen and the blockage plate are in close contact with each other, while the area of ​​the blockage plate is larger than the cross-section of the first filter screen.

[0010] Preferably, the blocking plate has limit posts distributed at equal angles, and the blocking plate and the slide plate form a sliding structure through the limit posts. The bottom of the blocking plate is in contact with the support post, and the support post is welded to the heating water tank.

[0011] Preferably, the limiting block and the limiting strip are slidably connected, and the limiting strip is distributed at equal angles on the cleaning ring, and the outer side of the cleaning ring is in contact with the inner wall of the heating water tank.

[0012] Preferably, the half gear is located on the outside of the natural gas boiler body, and the half gear is incompletely toothed, and the half gear meshes with the speed-increasing gear, while the diameter of the speed-increasing gear is smaller than the diameter of the half gear.

[0013] Preferably, the speed-increasing gear and the winding drum form an integrated structure, and the winding drum forms a linkage structure with the cleaning plate through a tension rope, and the cleaning plate forms a telescopic structure with the cleaning mechanism through a telescopic spring, while the bottom of the cleaning plate is in contact with the second filter screen.

[0014] Preferably, the protective plate forms a rotating structure with the cleaning mechanism via a spiral spring, and a push block is symmetrically fixedly installed on the top surface of the protective plate, with inclined notches on both sides of the push block, and the push block is located on the left and right sides of the power rod.

[0015] Preferably, the power rod and the fixed block are rotatably connected, and the power rod is meshed with the rack through a power gear. The rack is telescopically connected with the cleaning mechanism through a resistance spring, and the rack is symmetrically distributed on the push rod.

[0016] Compared with the prior art, the beneficial effects of the present invention are: this environmentally friendly natural gas boiler with flue gas recirculation supplementary heating...

[0017] 1. A sliding plate is installed inside the heating water tank, and a cleaning ring is installed on the outside of the sliding plate. When cleaning the heating water tank, the sliding plate will drive the cleaning ring to descend and clean the dirt on the inner wall surface of the heating water tank. Then, the water at the bottom of the sliding plate will be filtered through the first filter screen, so that the dirt cleaned by the sliding plate will always stay at the bottom of the sliding plate. When the blocking plate installed on the sliding plate comes into contact with the support column, the blocking plate will seal the first filter screen, thereby forming a sealed space at the bottom of the sliding plate. Then, the drain port is opened, which facilitates the discharge of sewage from the drain port, avoiding the need to stop the main body of the natural gas boiler to carry out cleaning work. At the same time, it reduces the waste of water resources and improves the overall practicality of the device.

[0018] 2. A cleaning mechanism is installed on the top of the natural gas boiler body to facilitate the filtration of flue gas discharged from the exhaust port. The cleaning mechanism is equipped with a cleaning plate to clean the surface of the second filter screen, avoid clogging of the second filter screen, and improve the filtration effect. Then, the filtered flue gas is transported to the combustion mechanism through the heat preservation pipe, so that the flue gas can be heated and reused. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the overall front cross-sectional structure of the present invention;

[0020] Figure 2 For the present invention Figure 1A magnified structural diagram of section A;

[0021] Figure 3 This is a schematic diagram of the connection structure between the tension rope and the cleaning plate in a front cross-section of the present invention;

[0022] Figure 4 This is a top-view cross-sectional diagram of the connection structure between the tension rope and the cleaning plate of the present invention;

[0023] Figure 5 For the present invention Figure 3 A magnified schematic diagram of the structure in section B;

[0024] Figure 6 For the present invention Figure 4 A schematic diagram of the enlarged structure from the middle C;

[0025] Figure 7 This is a front view schematic diagram of the connection structure between the spindle and the nut of the present invention;

[0026] Figure 8 This is a top view schematic diagram of the connection structure between the spindle and the nut of the present invention.

[0027] In the diagram: 1. Main body of natural gas boiler; 2. Combustion mechanism; 3. Heating water tank; 4. Exhaust pipe; 5. Cleaning mechanism; 6. Insulated pipe; 7. Motor; 8. Main shaft; 9. Nut; 10. Carrying plate; 11. Cleaning ring; 12. First filter screen; 13. Limiting post; 14. Blocking plate; 15. Supporting post; 16. Limiting strip; 17. Limiting block; 18. Half gear; 19. Speed-increasing gear; 20. Rewinding drum; 21. Tension rope; 22. Cleaning plate; 23. Telescopic spring; 24. Second filter screen; 25. Protective plate; 26. Push block; 27. Fixing block; 28. Push rod; 29. ​​Rack; 30. Resistance spring; 31. Power gear; 32. Power rod; 33. Spiral spring. Detailed Implementation

[0028] 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.

[0029] Please see Figure 1-8This invention provides a technical solution: an environmentally friendly natural gas boiler with flue gas recirculation supplementary heating, comprising a natural gas boiler body 1, a cleaning mechanism 5, a slide plate 10, and a cleaning ring 11. A combustion mechanism 2 is installed at the bottom of the natural gas boiler body 1, and a heating water tank 3 is installed at the top of the combustion mechanism 2. The left side of the combustion mechanism 2 is connected to the cleaning mechanism 5 via a flue gas exhaust pipe 4, and the left side of the cleaning mechanism 5 is connected to the combustion mechanism 2 via an insulation pipe 6. A motor 7 is installed at the top of the natural gas boiler body 1, and the main shaft 8 at the bottom of the motor 7 passes through the natural gas boiler body 1 and is connected to the heating water tank 3. The surface of the main shaft 8 contacts the slide plate 10 via a nut 9. A first filter screen 12 is provided inside the slide plate 10, and the bottom of the first filter screen 12 contacts a blocking plate 14. The top of the blocking plate 14 is connected to the slide plate 10 via a limiting post 13, and the bottom of the blocking plate 14 contacts a support post 15. The outer side of the cleaning ring 11 contacts a limiting block 17 via a limiting strip 16, and the limiting block 17... 7. Welded and fixed to the inner wall of the heating water tank 3, the main shaft 8 has a half gear 18 installed on its top, and the left and right sides of the half gear 18 are connected to the winding drum 20 through the speed-increasing gear 19. The surface of the winding drum 20 is connected to one side of the tension rope 21, while the other side of the tension rope 21 passes through the cleaning mechanism 5 and is connected to the cleaning plate 22. The left side of the cleaning plate 22 is connected to the cleaning mechanism 5 through the telescopic spring 23, and the bottom of the cleaning plate 22 is in contact with the second filter screen 24, which is located in the exhaust pipe. Above 4, the interior of the cleaning mechanism 5 is connected to the protective plate 25 via a spiral spring 33, and a push block 26 is provided on the top surface of the protective plate 25. A fixing block 27 is installed inside the right side of the cleaning mechanism 5, and a power rod 32 is provided inside the fixing block 27. A power gear 31 is provided on the right side of the power rod 32. One side of the power gear 31 is connected to the rack 29, and the right side of the rack 29 is connected to the cleaning mechanism 5 via a resistance spring 30. The right side of the rack 29 is welded to the push rod 28.

[0030] The front end of the main shaft 8 is located inside the heating water tank 3, and the main shaft 8 is threadedly connected to the slide plate 10 through the nut 9. The slide plate 10 is circular in top view. At the same time, the slide plate 10 and the cleaning ring 11 are integrated structures, which is conducive to the slide plate 10 driving the cleaning ring 11 to descend.

[0031] The slide plate 10 is provided with a first filter screen 12 at equal angles, and the first filter screen 12 is located directly above the blockage plate 14. The first filter screen 12 and the blockage plate 14 are in close contact with each other. At the same time, the area of ​​the blockage plate 14 is larger than the cross-section of the first filter screen 12, which is conducive to the first filter screen 12 filtering the water at the bottom of the slide plate 10.

[0032] Limiting posts 13 are distributed at equal angles on the blocking plate 14, and the blocking plate 14 and the slide plate 10 are formed by the limiting posts 13. The bottom of the blocking plate 14 is in contact with the support post 15, and the support post 15 is welded to the heating water tank 3. This is beneficial for the bottom of the slide plate 10 to form a relatively sealed space after the blocking plate 14 blocks the first filter screen 12.

[0033] The limiting block 17 and the limiting strip 16 are slidably connected, and the limiting strip 16 is distributed at equal angles on the cleaning ring 11. The outer side of the cleaning ring 11 is in close contact with the inner wall of the heating water tank 3, which is conducive to the cleaning ring 11 cleaning the inside of the heating water tank 3.

[0034] The half gear 18 is located on the outside of the natural gas boiler body 1, and the half gear 18 is incompletely toothed. The half gear 18 meshes with the speed-increasing gear 19. At the same time, the diameter of the speed-increasing gear 19 is smaller than the diameter of the half gear 18, which is beneficial for the speed-increasing gear 19 to rotate multiple times after the half gear 18 rotates once.

[0035] The speed-increasing gear 19 and the winding drum 20 form an integrated structure, and the winding drum 20 forms a linkage structure with the cleaning plate 22 through the tension rope 21. The cleaning plate 22 forms a telescopic structure with the cleaning mechanism 5 through the telescopic spring 23. At the same time, the bottom of the cleaning plate 22 is in close contact with the second filter screen 24, which is conducive to the cleaning plate 22 cleaning the second filter screen 24.

[0036] The protective plate 25 forms a rotating structure with the cleaning mechanism 5 through the spiral spring 33, and the top surface of the protective plate 25 is symmetrically fixedly equipped with a push block 26, and the two sides of the push block 26 are provided with inclined notches. At the same time, the push block 26 is located on the left and right sides of the power rod 32, which is conducive to the power rod 32 to push the protective plate 25 and facilitates the automatic opening of the protective plate 25.

[0037] The power rod 32 is rotatably connected to the fixed block 27, and the power rod 32 is meshed with the rack 29 through the power gear 31. The rack 29 is telescopically connected to the cleaning mechanism 5 through the resistance spring 30. At the same time, the rack 29 is symmetrically distributed on the push rod 28, which is beneficial for the bottom brush of the cleaning plate 22 to be cleaned after the power rod 32 rotates and extends.

[0038] The working principle of this embodiment: According to Figure 1-6When using this environmentally friendly natural gas boiler with flue gas recirculation supplementary heating, the operator first needs to place the main body 1 of the natural gas boiler in a suitable position, then connect the external power supply so that the motor 7 can operate normally. When the main body 1 of the natural gas boiler is working, the combustion mechanism 2 will heat the top combustion mechanism 2. When the combustion mechanism 2 is working, a large amount of flue gas will enter the interior of the cleaning mechanism 5 from the exhaust pipe 4, so that the second filter screen 24 inside the cleaning mechanism 5 will filter the solid particles inside the flue gas. Thus, the filtered flue gas is transported to the interior of the combustion mechanism 2 through the insulation pipe 6 for insulation and heating. When the second filter screen 24... After adsorbing a large amount of solid particles, motor 7 can be turned on, causing motor 7 to drive half gear 18 to rotate via main shaft 8. When half gear 18 rotates to a toothed portion, it meshes with speed-increasing gear 19, causing speed-increasing gear 19 to drive winding drum 20 to rotate. This causes winding drum 20 to wind up tension rope 21, facilitating the tension rope 21 to pull cleaning plate 22, which in turn pulls telescopic spring 23. Cleaning plate 22 then cleans the solid particles adsorbed on the second filter screen 24. When cleaning plate 22 moves to contact push rod 28, it causes push rod 28 to... 8. The compression causes the push rod 28 to drive the rack 29 to compress the resistance spring 30, facilitating the meshing motion of the rack 29 and the power gear 31. This causes the power gear 31 to drive the power rod 32 to rotate around the fixed block 27, facilitating the opening of the power rod 32 and enabling it to clean the brush at the bottom of the cleaning plate 22. When the power rod 32 contacts the inclined notch of the push block 26, it pushes the push block 26 downward, allowing the push block 26 to drive the protective plate 25 to rotate around the spiral spring 33. This causes the protective plate 25 to tilt, allowing the solid particles cleaned by the cleaning plate 22 to slide through the protective plate 25. Inside the storage bucket, it is convenient to clean the second filter screen 24, avoid the second filter screen 24 from being blocked, and improve work efficiency. When the half gear 18 rotates to the part without teeth, the cleaning plate 22 will be reset under the elastic action of the telescopic spring 23. When the cleaning plate 22 is disengaged from the push rod 28, the fixing block 27 and the power rod 32 will be reset under the elastic action of the resistance spring 30, which is convenient for the power rod 32 to clean the bottom of the cleaning plate 22 next time. Then the protective plate 25 will be reset under the elastic action of the spiral spring 33 to prevent the solid particles collected inside the storage bucket from flowing back into the cleaning mechanism 5.

[0039] according to Figure 1 and Figure 7-8When cleaning is required inside the heating water tank 3, the motor 7 drives the main shaft 8 to rotate, causing the main shaft 8 and the nut 9 to perform threaded motion. This causes the nut 9 to drive the cleaning ring 11 to descend via the slide plate 10. Because the limiting strip 16 and the limiting block 17 on the cleaning ring 11 have a locking and sliding structure, the slide plate 10 can move up and down inside the heating water tank 3, which is beneficial for the cleaning ring 11 to clean the dirt on the inner wall of the heating water tank 3. At the same time, the dirt that is cleaned will be located at the bottom of the slide plate 10, so that when the slide plate 10 descends, the water at the bottom of the slide plate 10 will be filtered through the first filter screen 12, preventing the dirt at the bottom of the slide plate 10 from flowing out. When the blocking plate 14 on the slide plate 10 comes into contact with the support column 15 at the top of the slide plate 10, the blocking plate 14 slides on the slide plate 10 through the limiting column 13. This helps the blocking plate 14 to block the first filter screen 12, creating a relatively sealed space at the bottom of the slide plate 10. This facilitates the discharge of sewage from the drain port, avoiding the need to stop the main body of the natural gas boiler 1 for cleaning. It also reduces the waste of water resources and improves the overall practicality of the device. Then, the motor 7 is rotated in the opposite direction, causing the slide plate 10 to rise. The blocking plate 14 will reset under the action of gravity, making it easier for the next cleaning operation, thus completing a series of tasks.

[0040] Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. An environmentally friendly natural gas boiler with flue gas recirculation supplementary heating, comprising a natural gas boiler body (1), a cleaning mechanism (5), a slide plate (10), and a cleaning ring (11), characterized in that: The bottom of the natural gas boiler body (1) is provided with a combustion mechanism (2), and the top of the combustion mechanism (2) is equipped with a heating water tank (3). The left side of the combustion mechanism (2) is connected to the cleaning mechanism (5) through a flue pipe (4), and the left side of the cleaning mechanism (5) is connected to the combustion mechanism (2) through a heat preservation pipe (6). The top of the natural gas boiler body (1) is equipped with a motor (7), and the main shaft (8) at the bottom of the motor (7) passes through the natural gas boiler body (1) and is connected to the heating water tank (3). The surface of the main shaft (8) is connected by a nut (9). The cleaning ring (11) is in contact with the slide plate (10). The slide plate (10) has a first filter screen (12) inside, and the bottom of the first filter screen (12) is in contact with the blockage plate (14). The top of the blockage plate (14) is connected to the slide plate (10) through the limiting post (13), and the bottom of the blockage plate (14) is in contact with the support post (15). The outer side of the cleaning ring (11) is in contact with the limiting block (17) through the limiting strip (16), and the limiting block (17) is welded and fixed to the inner wall of the heating water tank (3). The top of the main shaft (8) is equipped with a half gear (18). The half gear (18) is connected to the winding drum (20) via the speed-increasing gear (19) on the left and right sides, and the surface of the winding drum (20) is connected to one side of the tension rope (21). At the same time, the other side of the tension rope (21) passes through the cleaning mechanism (5) and is connected to the cleaning plate (22). The left side of the cleaning plate (22) is connected to the cleaning mechanism (5) via the telescopic spring (23), and the bottom of the cleaning plate (22) is in contact with the second filter screen (24). The second filter screen (24) is located above the exhaust pipe (4). The interior of the cleaning mechanism (5) is connected to the second filter screen (24). The spiral spring (33) is connected to the protective plate (25), and the top surface of the protective plate (25) is provided with a push block (26). The cleaning mechanism (5) is installed with a fixing block (27) inside the right side, and the fixing block (27) is provided with a power rod (32). The power rod (32) is provided with a power gear (31) on the right side. One side of the power gear (31) is connected to the rack (29), and the right side of the rack (29) is connected to the cleaning mechanism (5) through a resistance spring (30). The right side of the rack (29) is welded to the push rod (28). The half gear (18) is located on the outside of the natural gas boiler body (1), and the half gear (18) is incompletely toothed. The half gear (18) meshes with the speed-increasing gear (19), and the diameter of the speed-increasing gear (19) is smaller than the diameter of the half gear (18). The protective plate (25) forms a rotating structure with the cleaning mechanism (5) through the spiral spring (33), and the top surface of the protective plate (25) is symmetrically fixedly equipped with a push block (26), and the two sides of the push block (26) are set with inclined notches. At the same time, the push block (26) is located on the left and right sides of the power rod (32).

2. The environmentally friendly natural gas boiler with flue gas recirculation supplementary heating according to claim 1, characterized in that: The front end of the main shaft (8) is located inside the heating water tank (3), and the main shaft (8) is connected to the slide plate (10) by a nut (9). The slide plate (10) is circular in top view, and the slide plate (10) and the cleaning ring (11) are an integrated structure.

3. The environmentally friendly natural gas boiler with flue gas recirculation supplementary heating according to claim 1, characterized in that: The slide plate (10) is provided with a first filter screen (12) at equal angles, and the first filter screen (12) is located directly above the blockage plate (14). The first filter screen (12) and the blockage plate (14) are in close contact with each other, and the area of ​​the blockage plate (14) is larger than the cross-section of the first filter screen (12).

4. The environmentally friendly natural gas boiler with flue gas recirculation supplementary heating according to claim 1, characterized in that: The blocking plate (14) is provided with limit posts (13) at equal angles, and the blocking plate (14) and the slide plate (10) are connected by the limit posts (13). The bottom of the blocking plate (14) is in contact with the support post (15), and the support post (15) is welded to the heating water tank (3).

5. The environmentally friendly natural gas boiler with flue gas recirculation supplementary heating according to claim 1, characterized in that: The limiting block (17) and the limiting strip (16) are slidably connected, and the limiting strip (16) is distributed at equal angles on the cleaning ring (11), and the outer side of the cleaning ring (11) is in contact with the inner wall of the heating water tank (3).

6. The environmentally friendly natural gas boiler with flue gas recirculation supplementary heating according to claim 1, characterized in that: The speed-increasing gear (19) and the winding drum (20) form an integrated structure, and the winding drum (20) and the cleaning plate (22) form a linkage structure through the tension rope (21), and the cleaning plate (22) and the cleaning mechanism (5) form a telescopic structure through the telescopic spring (23), while the bottom of the cleaning plate (22) is in contact with the second filter screen (24).

7. The environmentally friendly natural gas boiler with flue gas recirculation supplementary heating according to claim 1, characterized in that: The power rod (32) is rotatably connected to the fixed block (27), and the power rod (32) is meshed with the rack (29) through the power gear (31), and the rack (29) is telescopically connected with the cleaning mechanism (5) through the resistance spring (30), while the rack (29) is symmetrically distributed on the push rod (28).

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