A horizontal condensing gas-fired normal pressure hot water boiler

Abstract

The present invention discloses a horizontal condensing gas-fired atmospheric pressure hot water boiler, which relates to the technical field of atmospheric pressure hot water boilers. The boiler comprises a tank body communicated with a boiler flue gas channel, an air inlet being provided at one end of the tank body, and a heat exchange pipe, wherein the heat exchange pipe comprises a plurality of groups of annular tubes arranged inside the tank body, through holes being symmetrically opened at both ends of the annular tubes, a partition being fixedly provided between two groups of through holes inside the annular tubes, and a connecting pipe being fixedly connected between the two groups of the annular tubes; the present invention reduces the speed of water flow by arranging the annular tubes and the partitions, thereby improving the heat exchange effect; the reciprocating flow of the flue gas further increases the contact time between the flue gas and the heat exchange pipe, so that the heat in the flue gas can be fully absorbed by the heat exchange pipe, thereby reducing the heat loss caused by insufficient heat exchange.

Description

Technical Field

[0001] The present invention relates to the technical field of atmospheric pressure hot water boilers, in particular to a horizontal condensing gas atmospheric pressure hot water boiler. Background Art

[0002] A horizontal condensing gas-fired atmospheric hot water boiler is a highly efficient and environmentally friendly heating device. It recovers both sensible and latent heat from flue gases through condensation technology, significantly improving thermal efficiency to typically over 100%. Designed to operate at atmospheric pressure, this boiler is safe, reliable, and explosion-proof. Equipped with a variety of safety features to ensure stable operation, the boiler utilizes low-nitrogen combustion technology to reduce harmful gas emissions and comply with environmental standards. Suitable for a variety of locations, such as residences and bathhouses, it provides heating and domestic hot water.

[0003] Horizontal condensing atmospheric pressure hot water boilers often use straight tubes, spiral tubes or corrugated tubes for heat exchange. Straight tubes are prone to fast flow and insufficient heat exchange, while spiral tubes and bellows can improve heat exchange efficiency but are not easy to clean. Summary of the Invention

[0004] The object of the present invention is to provide a horizontal condensing gas-fired atmospheric pressure hot water boiler to solve at least one technical problem existing in the above-mentioned prior art.

[0005] To achieve the above-mentioned object, the present invention provides the following technical solution: a horizontal condensing gas-fired atmospheric pressure hot water boiler, comprising a tank body communicating with a boiler flue gas passage, an air inlet being provided at one end of the tank body, and further comprising:

[0006] The heat exchange pipe comprises a plurality of annular tubes arranged inside the tank body, the two ends of the annular tubes are symmetrically provided with through holes, a partition is fixedly provided inside the annular tube between the two groups of through holes, and a connecting pipe is fixedly connected between the two groups of the annular tubes.

[0007] Preferably, a reflux channel is provided between the multiple groups of annular tubes, and the reflux channel includes a barrel provided on the end faces of the multiple groups of annular tubes, and the end of the barrel is close to the surface of the annular tube, and the inner ring contact surface of the annular tube is located in the barrel, and the end face of a group of barrels close to the air inlet position is fixedly connected with a closed tube, and multiple groups of fixing frames are fixedly provided on the outside of the barrel, and the end of the fixing frame is fixedly connected to the inner wall of the tank body, and the closed tube passes through the tank body and is connected with the exhaust gas exhaust pipe.

[0008] Preferably, multiple sets of cleaning rings are sleeved on the outside of the annular tube, and the inner walls of the cleaning rings fit the outer wall of the annular tube. Circular hoops are fixed on the outer sides of the multiple sets of cleaning rings, and the cleaning rings can slide on the surface of the annular tube to clean the smoke and dust on the annular tube.

[0009] Preferably, multiple groups of fixing seats are fixed on the outside of the circular hoop, and the top ends of the multiple groups of fixing seats are rotatably connected to blades. A shaft cover is fixed on the top of the fixing seat, and a disc spring is fixed between the shaft cover and the connecting shaft of the blade.

[0010] Preferably, the end of the blade is fixedly connected to a guide rod, a plurality of fixed blocks are fixedly provided on the outside of the barrel, the outside of the fixed block is fixedly connected to a surrounding plate through an extension plate, and a limiting groove is formed between the surrounding plate and the fixed block.

[0011] Preferably, a baffle is fixedly provided on the outer side of the barrel, and the baffle can interfere with the blade to limit its rotation angle, and the baffle and the fixing rod are located at opposite ends of the blade.

[0012] Preferably, a first fixing plate is fixed to the outside of the bobbin, and a limiting rod is fixed to one side of the first fixing plate, a second fixing plate is fixed to the circular hoop, and the second fixing plate is sleeved with the limiting rod, a return spring is sleeved on the outside of the limiting rod, and both ends of the return spring are in contact with the first fixing plate and the second fixing plate respectively.

[0013] Preferably, two groups of limiting rings are fixedly provided on the outer sides of the multiple groups of cleaning rings on one group of the annular tubes, and the two groups of limiting rings are symmetrically arranged, and the ends of the bobbins are plugged into the limiting rings.

[0014] Preferably, an end cap is fixedly connected to one end of the tank body.

[0015] Preferably, the two groups of connecting pipes located at the head and tail ends pass through the tank body and are connected to the external water inlet and outlet systems.

[0016] Compared with the prior art, the present invention has the following beneficial effects:

[0017] The annular tube and baffle are set up to slow down the water flow speed and improve the heat exchange effect. The reciprocating flow of flue gas further increases the contact time between flue gas and heat exchange pipe, so that the heat in the flue gas can be fully absorbed by the heat exchange pipe, reducing the heat loss caused by insufficient heat exchange.

[0018] The cleaning ring moves back and forth along the surface of the annular tube. During its movement, it continuously cleans the surface of the annular tube. By cleaning the smoke and dust attached to the surface of the annular tube, the heat in the smoke can be more efficiently transferred to the water through the pipe, thereby improving the heat absorption effect and avoiding the decrease in heat exchange rate caused by smoke and dust attachment after long-term use. At the same time, it can reduce equipment energy consumption and save energy. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0020] Figure 2Schematic diagram of the structure of the heat exchange pipeline in the present invention;

[0021] Figure 3 is a cross-sectional view of the annular tube in the present invention;

[0022] Figure 4 is a cross-sectional view of the tank body of the present invention;

[0023] Figure 5 It is a structural schematic diagram of the fixing seat in the present invention;

[0024] Figure 6 It is a structural schematic diagram of the fixed block in the present invention;

[0025] Figure 7 Schematic diagram of the structure of the return spring in the present invention;

[0026] In the figure: 1. tank body; 2. air inlet; 3. end cover; 4. annular tube; 5. through hole; 6. partition; 7. connecting tube; 8. bobbin; 9. closing tube; 10. fixing frame; 11. cleaning ring; 12. hoop; 13. fixing seat; 14. paddle; 15. shaft cover; 16. disc spring; 17. baffle; 18. guide rod; 19. fixing block; 20. enclosure; 21. limiting groove; 22. first fixing plate; 23. limiting rod; 24. second fixing plate; 25. return spring; 26. limiting ring. DETAILED DESCRIPTION

[0027] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0028] Example 1

[0029] Reference Figure 1-Figure 2 , provides a horizontal condensing gas-fired atmospheric pressure hot water boiler, comprising a tank body 1 communicating with a boiler flue gas passage, an air inlet 2 being provided at one end of the tank body 1, and further comprising:

[0030] The heat exchange pipeline includes multiple groups of annular tubes 4 arranged inside the tank body 1. Through holes 5 are symmetrically opened on both ends of the annular tube 4. A partition 6 is fixedly installed between two groups of through holes 5 inside the annular tube 4. A connecting pipe 7 is fixedly connected between the two groups of annular tubes 4.

[0031] An end cover 3 is fixedly connected to one end of the tank body 1 .

[0032] Two groups of connecting pipes 7 at the head and tail ends pass through the tank body 1 and are connected to the external water inlet and outlet systems.

[0033] The flue gas enters the tank body 1 through the air inlet 2 and exchanges heat with the water in the heat exchange pipe. Since the connecting pipe 7 at the end is connected to the water inlet and outlet systems, water enters the heat exchange pipe from a group of connecting pipes 7. After the water passes through the through hole 5 on the first end face of the annular pipe 4, the partition 6 separates the through holes 5 on the two end faces of the annular pipe 4, so that the water flows in the annular cavity for a circle before passing through the through hole 5 on the second end face to enter the next group of connecting pipes 7. The arrangement of the annular pipe 4 and the partition 6 can slow down the flow speed of the water, so that the water can have a longer heat exchange time during the heat exchange process, thereby improving the heat exchange effect.

[0034] Example 2

[0035] Reference Figure 1-Figure 2 On the basis of the above embodiment 1, the path of the flue gas flowing in the tank body 1 is extended so that the flue gas can fully contact with the heat exchange pipe, as follows:

[0036] A reflux channel is provided between the multiple groups of annular tubes 4. The reflux channel includes a barrel 8 provided on the end faces of the multiple groups of annular tubes 4, and the end of the barrel 8 is close to the surface of the annular tube 4. The inner ring contact surface of the annular tube 4 is located in the barrel 8. The end face of a group of barrels 8 close to the air inlet 2 is fixedly connected with a closed tube 9. Multiple groups of fixing frames 10 are fixedly provided on the outside of the barrel 8, and the end of the fixing frame 10 is fixedly connected to the inner wall of the tank body 1. The closed tube 9 passes through the tank body 1 and is connected with the exhaust gas exhaust pipe.

[0037] The setting of the closed tube 9 prevents the flue gas from entering the inner circle of the annular tube 4 when it flows from the air inlet 2 toward the end cover 3. During this process, the flue gas contacts and exchanges heat with the heat exchange pipe for the first time. When the flue gas flows to the tail end of the tank body 1, it rotates and flows into the barrel 8 and flows toward the closed tube 9. When the flue gas flows in multiple groups of barrels 8, the flue gas contacts and exchanges heat with the heat exchange pipe for the second time. The flue gas after the secondary heat exchange is discharged after passing through the closed tube 9. The reciprocating flow of the flue gas further increases the contact time between the flue gas and the heat exchange pipe, so that the heat in the flue gas can be fully absorbed by the heat exchange pipe, reducing the heat loss caused by insufficient heat exchange.

[0038] In this embodiment, the surface shape of the end cover 3 is preferably arc-shaped. When the end cover 3 is set to an arc shape, the flue gas flowing to the tail end of the tank body 1 can be guided through the inner wall of the end cover 3 and flow better into the barrel 8, further ensuring the heat exchange efficiency.

[0039] In one of the more preferred embodiments, an exhaust device may be added to the end of the closed tube 9 to improve the flow effect of the smoke into the reflux channel.

[0040] Example 3

[0041] Reference Figure 1-Figure 7On the basis of the above-mentioned embodiment 2, a cleaning mechanism is provided on the outside of the annular tube 4 to improve the heat exchange effect of the heat exchange pipe after long-term use.

[0042] Multiple sets of cleaning rings 11 are sleeved on the outside of the annular tube 4, and the inner walls of the cleaning rings 11 fit the outer walls of the annular tube 4. Round hoops 12 are fixed on the outsides of the multiple sets of cleaning rings 11. The cleaning rings 11 can slide on the surface of the annular tube 4 to clean the smoke and dust on the annular tube 4.

[0043] A plurality of fixing seats 13 are fixed on the outside of the circular hoop 12 , and the tops of the plurality of fixing seats 13 are rotatably connected to blades 14 . A shaft cover 15 is fixed on the top of the fixing seat 13 , and a disc spring 16 is fixed between the shaft cover 15 and the connecting shaft of the blade 14 .

[0044] The end of the blade 14 is fixedly connected to a guide rod 18, and multiple groups of fixing blocks 19 are fixedly provided on the outside of the barrel 8. The outside of the fixing block 19 is fixedly connected to a surrounding plate 20 through an extension plate, and a limiting groove 21 is formed between the surrounding plate 20 and the fixing block 19.

[0045] A first fixing plate 22 is fixed to the outside of the bobbin 8, and a limiting rod 23 is fixed to one side of the first fixing plate 22. A second fixing plate 24 is fixed to the circular hoop 12, and the second fixing plate 24 is sleeved with the limiting rod 23. A return spring 25 is sleeved on the outside of the limiting rod 23, and both ends of the return spring 25 respectively contact the first fixing plate 22 and the second fixing plate 24.

[0046] Driven by the disc spring 16, the blade 14 has a certain rotation angle in the initial state to ensure that the bottom end of the fixing rod is located at the fixed side;

[0047] When the smoke enters the tank body 1, the flow of the smoke generates wind force, and the angle of the blade 14 is set so that the blade 14 can move after contacting the airflow, so that the blade 14 drives the multiple sets of cleaning rings 11 to move along the axis of the tank body 1 through the hoop 12. During the sliding process of the cleaning ring 11 in the first direction, its inner wall scrapes off the smoke and dust on the surface of the annular tube 4. The first direction is Figure 5 In the direction indicated by the arrow, the paddle 14 is also driven to rotate along the axis of the tank body 1 during this process. At this time, the guide rod 18 is driven to slide from the side of the fixed block 19 to the front of the fixed block 19. The outer side of the guide rod 18 conflicts with the front of the fixed block 19. The paddle 14 is driven to rotate around the connecting axis in the second direction to a deflection angle. The second direction is as shown in FIG. Figure 6 In the direction indicated by the middle arrow, due to the further deflection of the blade 14, the wind force on the blade 14 increases. At the same time, the hoop 12 moves, driving the second fixing plate 24 to squeeze the return spring 25.

[0048] like Figure 5As shown, the guide rod 18 pulls the disc spring 16 when it deflects an angle. When the guide rod 18 moves to pass over the A surface of the fixed block 19, the return spring 25 can no longer be compressed. At the same time, since the guide rod 18 is no longer in contact with the fixed block 19 and is limited, at the moment the guide rod 18 passes over the A surface, the disc spring 16 drives the blade 14 to rotate an angle so that the bottom end of the guide rod 18 contacts the A surface. At this time, the return spring 25 extends, and the return spring 25 pushes the hoop 12 to move in the third direction, which is opposite to the first direction. Due to the resistance of the guide rod 18 to the A surface, when the hoop 12 rotates in the third direction, the blade 14 rotates around the connecting axis in the fourth direction, which is opposite to the second direction. In the direction, during the rotation of the blade 14, the bottom end of the guide rod 18 slides along the A surface into the limit groove 21. When the guide rod 18 is located at the corner of the limit groove 21, the blade 14 rotates to be parallel to the direction of the smoke flow. Due to the limitation of the guide rod 18 by the tail plate, the blade 14 cannot continue to rotate. At this time, the wind force has little effect on the blade 14, and the return spring 25 is subjected to reduced resistance, instantly pushing the hoop 12 to move in the third direction. During the movement, the guide rod 18 moves in the limit groove 21 to maintain the state of the blade 14 during the movement. When the guide rod 18 moves to the end of the limit groove 21, the hoop 12 is completely reset, and the disc spring 16 drives the blade 14 back to its initial state.

[0049] The cleaning ring 11 is driven by the above-mentioned mechanism to move back and forth along the surface of the annular tube 4. During its movement, the surface of the annular tube 4 is continuously cleaned. By cleaning the smoke and dust attached to the surface of the annular tube 4, the heat in the smoke can be more efficiently transferred to the water by the pipe, thereby improving the heat absorption effect and avoiding the decrease in heat exchange rate caused by smoke and dust attachment after long-term use. At the same time, it can reduce equipment energy consumption and save energy.

[0050] In this embodiment, the cleaning rings 11 are preferably arranged at equal intervals on the outside of the annular tube 4, so that when multiple groups of cleaning rings 11 slide on the outside of the annular tube 4, the annular tube 4 can be cleaned evenly, thereby avoiding the problem of uneven heat exchange in the heat exchange pipeline.

[0051] In one of the more preferred embodiments, a baffle 17 is fixedly provided on the outside of the barrel 8 , and the baffle 17 can interfere with the blade 14 to limit its rotation angle. The baffle 17 and the fixing rod are located at opposite ends of the blade 14 .

[0052] When the blade 14 is in the initial state, the baffle 17 blocks one side of the blade 14 to prevent the blade 14 from rotating in the third direction, thereby ensuring the cleaning effect of the cleaning ring 11 .

[0053] In one of the more preferred embodiments, two sets of limiting rings 26 are fixedly provided on the outside of the multiple sets of cleaning rings 11 located on a set of annular tubes 4, and the two sets of limiting rings 26 are symmetrically arranged, and the end of the barrel 8 is plugged into the limiting ring 26, and the setting of the return channel enables the airflow to better drive the contact with the blade 14.

[0054] By plugging the barrel 8 into the limiting ring 26 , the cleaning ring 11 can rotate more stably. At the same time, a seal can be added between the limiting ring 26 and the annular tube 4 , thereby better controlling the direction of the airflow in the tank body 1 .

[0055] The flue gas with heat from the boiler enters the tank body 1 through the air inlet 2 and exchanges heat with the water in the heat exchange pipe. Since the connecting pipe 7 at the end is connected to the water inlet and outlet systems, water enters the heat exchange pipe from one group of connecting pipes 7. After the water passes through the through hole 5 on the first end face of the annular pipe 4, the partition 6 separates the through holes 5 on the two end faces of the annular pipe 4, so that the water flows through the inner cavity of the annular pipe 4 for a circle before passing through the through hole 5 on the second end face to enter the next group of connecting pipes 7. The arrangement of the annular pipe 4 and the partition 6 slows down the flow of water, so that the water can have a longer heat exchange time during the heat exchange process, thereby improving the heat exchange effect.

[0056] During the heat exchange process of flue gas flow, due to the setting of the closed tube 9, when the flue gas flows from the air inlet 2 to the end cover 3, it will not enter the inner circle of the annular tube 4. In this process, the flue gas contacts the heat exchange pipe for the first time for heat exchange. When the flue gas flows to the tail end of the tank body 1, it rotates and flows into the barrel 8 and flows toward the closed tube 9. When the flue gas flows in multiple groups of barrels 8, the flue gas contacts the heat exchange pipe for a second time for heat exchange. The flue gas after the second heat exchange is discharged after passing through the closed tube 9. The reciprocating flow of the flue gas further increases the contact time between the flue gas and the heat exchange pipe, so that the heat in the flue gas can be fully absorbed by the heat exchange pipe, reducing the heat loss caused by insufficient heat exchange. The arc shape of the end cover guides the flue gas flow into the barrel 8.

[0057] Driven by the disc spring 16, the blade 14 has a certain rotation angle in the initial state to ensure that the bottom end of the fixing rod is located at the fixed side;

[0058] When the flue gas flows between the return channel and the tank body 1, the flow of the flue gas generates wind force, which enables the blades 14 to move after contacting the airflow, thereby causing the blades 14 to drive the multiple sets of cleaning rings 11 to move along the axis of the tank body 1 through the hoop 12. During the sliding process of the cleaning ring 11 in the first direction, its inner wall scrapes off the smoke and dust on the surface of the annular tube 4. The first direction is Figure 5In the direction indicated by the arrow, the paddle 14 is also driven to rotate along the axis of the tank body 1 during this process. At this time, the guide rod 18 is driven to slide from the side of the fixed block 19 to the front of the fixed block 19. The outer side of the guide rod 18 conflicts with the front of the fixed block 19. The paddle 14 is driven to rotate around the connecting axis in the second direction to a deflection angle. The second direction is as shown in FIG. Figure 6 In the direction indicated by the middle arrow, due to the further deflection of the blade 14, the wind force on the blade 14 increases. At the same time, the hoop 12 moves, driving the second fixing plate 24 to squeeze the return spring 25.

[0059] like Figure 5 As shown, the guide rod 18 pulls the disc spring 16 when it deflects an angle. When the guide rod 18 moves to the A surface over the fixed block 19, the return spring 25 can no longer be compressed. At the same time, since the guide rod 18 is no longer in contact with the fixed block 19 and is limited, at the moment the guide rod 18 passes the A surface, the disc spring 16 drives the blade 14 to rotate an angle so that the bottom end of the guide rod 18 contacts the A surface. At this time, the return spring 25 stretches, and the return spring 25 pushes the hoop 12 to move in the third direction, which is opposite to the first direction. Due to the resistance of the guide rod 18 to the A surface, when the hoop 12 rotates in the third direction, the blade 14 rotates around the connecting axis in the fourth direction, which is opposite to the second direction. During the rotation of the blade 14, the bottom end of the guide rod 18 slides along the A surface into the limit groove 21. When the guide rod 18 is located at the corner of the limit groove 21, the blade 14 rotates to be parallel to the direction of the smoke flow. Due to the limitation of the guide rod 18 by the tail plate, the blade 14 cannot continue to rotate. At this time, the wind force has little effect on the blade 14. The resistance of the return spring 25 is reduced, and the circular hoop 12 is instantly pushed to move in the third direction. During the movement, the guide rod 18 moves in the limit groove 21 to maintain the state of the blade 14 during the movement. When the guide rod 18 moves to the end of the limit groove 21, the circular hoop 12 is completely reset, and the disc spring 16 drives the blade 14 back to the initial state to prepare for the next cycle.

[0060] The cleaning ring 11 is driven by the above-mentioned mechanism to move back and forth along the surface of the annular tube 4. During its movement, the surface of the annular tube 4 is continuously cleaned. By cleaning the smoke and dust attached to the surface of the annular tube 4, the heat in the smoke can be more efficiently transferred to the water by the pipe, thereby improving the heat absorption effect and avoiding the decrease in heat exchange rate caused by smoke and dust attachment after long-term use. At the same time, it can reduce equipment energy consumption and save energy.

[0061] The standard parts used in this embodiment can be purchased directly from the market, and the non-standard structural components recorded in the specification and drawings can also be directly processed according to existing technical common sense without any doubt. At the same time, the connection method of each component adopts the mature conventional means in the existing technology, and the machinery, parts and equipment all adopt conventional models in the existing technology, so no specific description will be given here.

[0062] While embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions, and variations may be made to these embodiments without departing from the principles and spirit of the invention, and that the scope of the invention is defined by the appended claims and their equivalents.

Claims

1. A horizontal condensing gas-fired atmospheric pressure hot water boiler, comprising a tank body (1) communicating with a boiler flue gas passage, wherein one end of the tank body (1) is provided with an air inlet (2), characterized in that: It also includes: a heat exchange pipe, the heat exchange pipe including a plurality of groups of annular pipes (4) arranged inside the tank body (1), through holes (5) symmetrically opened on both ends of the annular pipe (4), a partition (6) fixedly provided between two groups of through holes (5) inside the annular pipe (4), and a connecting pipe (7) fixedly connected between the two groups of the annular pipes (4); A reflux channel is provided between the plurality of groups of annular tubes (4), and the reflux channel comprises a tube (8) provided on the end surface of the plurality of groups of annular tubes (4), and the end of the tube (8) is close to the surface of the annular tube (4), and the end surface of a group of tubes (8) located near the position of the air inlet (2) in the tube (8) is fixedly connected to a closed tube (9), and a plurality of fixing frames (10) are fixedly provided on the outside of the tube (8), and the end of the fixing frame (10) is fixedly connected to the inner wall of the tank body (1), and the closed tube (9) passes through the tank body (1) and is connected to the exhaust gas discharge pipe; The outer side of the annular tube (4) is sleeved with a plurality of cleaning rings (11), and the inner walls of the cleaning rings (11) are in contact with the outer wall of the annular tube (4). Circular hoops (12) are fixedly provided on the outer sides of the plurality of cleaning rings (11). The cleaning rings (11) can slide on the surface of the annular tube (4) to clean the smoke and dust on the annular tube (4). A plurality of sets of fixing seats (13) are fixedly provided on the outside of the circular hoop (12), and the tops of the plurality of sets of fixing seats (13) are all rotatably connected to blades (14). A shaft cover (15) is fixedly provided on the top of the fixing seat (13), and a disc spring (16) is fixedly provided between the shaft cover (15) and the connecting shaft of the blade (14); The ends of the blades (14) are fixedly connected to guide rods (18), the outer side of the barrel (8) is fixedly provided with a plurality of fixed blocks (19), the outer side of the fixed blocks (19) is fixedly connected to a surrounding plate (20) via an extension plate, and a limiting groove (21) is formed between the surrounding plate (20) and the fixed block (19); A first fixing plate (22) is fixed on the outer side of the bobbin (8), and a limiting rod (23) is fixed on one side of the first fixing plate (22). A second fixing plate (24) is fixed on the circular hoop (12), and the second fixing plate (24) is sleeved with the limiting rod (23). A return spring (25) is sleeved on the outer side of the limiting rod (23), and two ends of the return spring (25) respectively contact the first fixing plate (22) and the second fixing plate (24).

2. The horizontal condensing gas-fired atmospheric pressure hot water boiler according to claim 1, characterized in that: A baffle (17) is fixedly provided on the outside of the barrel (8), and the baffle (17) can contact the blade (14) to limit its rotation angle. The baffle (17) and the fixing rod are located at opposite ends of the blade (14).

3. The horizontal condensing gas-fired atmospheric pressure hot water boiler according to claim 2, characterized in that: Two groups of limiting rings (26) are fixedly provided on the outer sides of the multiple groups of cleaning rings (11) on a group of the annular tubes (4), and the two groups of limiting rings (26) are symmetrically arranged. The ends of the barrels (8) are plugged into the limiting rings (26).

4. The horizontal condensing gas-fired atmospheric pressure hot water boiler according to claim 1, characterized in that: One end of the tank body (1) is fixedly connected to an end cover (3).

5. The horizontal condensing gas-fired atmospheric pressure hot water boiler according to claim 1, characterized in that: The two groups of connecting pipes (7) located at the head and tail ends penetrate the tank body (1) and are connected to the external water inlet and outlet systems.

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