Movable blade adjustable axial flow type induced draft fan for large power station

Abstract

The invention relates to the technical field of axial flow fans, and discloses a movable blade adjustable axial flow type induced draft fan for a large power station, which comprises a fixed barrel, a first side connecting plate and a second side connecting plate, a dustproof plate is arranged on the outer side of the first side connecting plate, an inserting hole is formed in the side edge of the dustproof plate, a guide hole is formed in the side edge of the first side connecting plate, an inserting guide column is slidably connected to the upper portion of an inner cavity of the guide hole, and an extrusion spring is arranged in the inner cavity of the guide hole; a threaded rod is rotatably connected to the top end of the inserting guide column, an outer rotating handle is installed at the top end of the threaded rod, a sliding block is in threaded fit with the surface of the threaded rod, side rotating clamping plates are rotatably connected to the lower portions of the two sides of the sliding block, and a limiting piece is arranged between the sliding block and the inserting guide column; according to the induced draft fan, preliminary positioning of the dustproof plate can be achieved by extruding the springs, the installation process is simplified, and operation convenience is improved; the side rotating clamping plate is controlled through the outer rotating handle to achieve stable locking of the dustproof plate, looseness and displacement in the operation process are avoided, and the dustproof effect and the installation stability are guaranteed.

Description

Technical Field

[0001] This invention relates to the field of axial flow fan technology, specifically to a large power plant axial flow induced draft fan with adjustable moving blades. Background Technology

[0002] In the thermal system of large power plants, the adjustable-blade axial-flow induced draft fan is one of the key auxiliary equipment. It plays an important role in extracting the flue gas generated after boiler combustion, maintaining the normal negative pressure in the boiler furnace, and ensuring the stable operation of the entire thermal cycle. Since there are a lot of dust and particulate matter and other impurities in the power plant operating environment, in order to prevent these impurities from entering the core components of the induced draft fan and affecting its operating accuracy and service life, dustproof plates are usually installed at the corresponding positions of the induced draft fan to protect the core components.

[0003] In existing technologies, the installation and positioning of dustproof plates and side connecting plates of induced draft fans mostly adopt traditional methods such as bolt fastening or pin insertion. These methods require additional tools and necessitate repeated calibration of the relative positions of the dustproof plates and side connecting plates during positioning, making the process cumbersome and significantly reducing installation efficiency. Furthermore, the locking structure of the dustproof plates often uses a single bolt lock, which is prone to loosening under the vibration generated by the long-term high-speed operation of the induced draft fan. This can lead to displacement of the dustproof plate, weakening its dustproof effect and potentially causing interference with other rotating parts of the induced draft fan, affecting its operational stability. Therefore, a large-scale power plant adjustable-blade axial-flow induced draft fan is proposed. Summary of the Invention

[0004] To address the shortcomings of existing technologies, this invention provides an adjustable axial flow induced draft fan for large power plants, thereby solving the technical problem of cumbersome dustproof plate installation and positioning procedures.

[0005] To achieve the above objectives, the present invention provides the following technical solution: a large power plant adjustable axial flow induced draft fan, comprising:

[0006] A fixed cylinder, and a first side connecting plate and a second side connecting plate respectively provided at the air inlet end and the air outlet end of the fixed cylinder, and a blade shaft is rotatably connected to the inner cavity of the fixed cylinder, and a moving blade is provided on the surface of the blade shaft, and an adjustment locking component is provided between the moving blade and the blade shaft, and a drive motor is coaxially connected to the end of the blade shaft, and a coupling is provided between the blade shaft and the drive motor, and a dustproof plate is provided on the outer side of the first side connecting plate, and an insertion hole is opened on the side of the dustproof plate;

[0007] A guide hole is opened on the side of the first side connecting plate, and a plug-in guide post is slidably connected to the upper part of the inner cavity of the guide hole. A compression spring is added between the bottom end of the guide hole and the bottom of the inner cavity of the guide hole, and the plug-in guide post is plugged into the plug-in hole.

[0008] A threaded rod is rotatably connected to the top of the plug-in guide post, and an external rotating handle is installed at the top of the threaded rod. A sliding block is threadedly engaged with the surface of the threaded rod, and side rotating plates are rotatably connected to the lower parts of both sides of the sliding block. A limiting component is added between the sliding block and the plug-in guide post.

[0009] After the dustproof plate is attached to the first side connecting plate, the fixed cylinder is fixed by connecting the corresponding part through the second side connecting plate. The compression spring in the guide hole drives the insertion guide post to be inserted into the insertion hole of the dustproof plate. The threaded rod is rotated by the outer rotating handle, the threaded rod drives the sliding block to descend, and the sliding block drives the side rotating plates on both sides to rotate.

[0010] When the bottom of the side-rotating plate contacts the top of the insertion guide post, the side-rotating plate changes from a vertical state to a horizontal state, and the lower part of the side-rotating plate fits tightly against the upper part of the dustproof plate; during this process, the limiting component between the sliding block and the insertion guide post limits the movement of the sliding block.

[0011] The drive motor drives the blade shaft to rotate through the coupling, and the blade shaft drives the moving blade to rotate. The adjusting locking component between the moving blade and the blade shaft locks the position of the moving blade, ensuring that the moving blade rotates stably with the blade shaft and realizing the induced draft function.

[0012] Preferably, the dustproof plate has chambers at both the upper and lower parts of its inner cavity, and a fixing post is horizontally installed inside each chamber. The chambers provide suitable installation space for the fixing post, preventing collision damage caused by exposed fixing posts. The horizontally installed fixing post enhances the overall structural strength of the dustproof plate, preventing warping and deformation due to uneven stress during long-term use. It also provides a stable load-bearing carrier for the subsequent assembly of the sliding plate, ensuring the assembly accuracy of dustproof components.

[0013] Preferably, a sliding plate is sleeved and connected to the surface of the fixed column, and the surface of the sliding plate is slidably fitted with the inner wall of the chamber. This sleeved connection between the sliding plate and the fixed column limits the movement trajectory of the sliding plate, preventing misalignment during sliding. The slidable fit design between the sliding plate and the inner wall of the chamber reduces gaps during sliding, improving movement stability. The inner wall of the chamber guides and limits the sliding plate, preventing excessive sliding or shaking, thus ensuring the stable implementation of subsequent dust scraping actions.

[0014] Preferably, a return spring is fitted onto the surface of the fixed column, with both ends of the return spring respectively abutting the inner wall of the chamber and the corresponding surface of the fixed column. The return spring enables the sliding plate to automatically reset, eliminating the need for an additional drive mechanism, simplifying the overall structural complexity, and reducing equipment maintenance costs. The abutting design of both ends of the return spring with the inner wall of the chamber and the corresponding surface of the fixed column ensures uniform spring force, preventing misalignment or jamming during deformation, guaranteeing the reliable and stable reset function, and improving the automated operation efficiency of the dustproof structure.

[0015] Preferably, a dust scraper is slidably attached to the front of the dustproof plate, and the dust scraper and the sliding plate are connected. The linkage design between the dust scraper and the sliding plate allows the dust scraping action to be achieved by the movement of the sliding plate, eliminating the need for a separate dust scraping drive structure, thus optimizing the spatial layout. The sliding attachment design between the dust scraper and the dustproof plate can thoroughly scrape away dust adhering to the surface of the dustproof plate, preventing dust accumulation from affecting the dustproof effect and improving the ease of operation and maintenance of the equipment.

[0016] Preferably, the inner cavity of the fixed cylinder is uniformly reinforced with reinforcing ribs, which are arranged along the axial direction of the fixed cylinder. The axially arranged reinforcing ribs can effectively disperse the external force on the fixed cylinder in the axial direction, improve the axial structural rigidity of the fixed cylinder, and prevent it from tensile or compressive deformation due to excessive axial force during long-term operation. The uniformly distributed design ensures that the internal cavity of the fixed cylinder is subjected to balanced force, prevents damage due to concentrated force in local areas, and extends the service life of the fixed cylinder.

[0017] Preferably, the inner cavity of the fixed cylinder is uniformly reinforced with reinforcing ribs, which are arranged circumferentially around the fixed cylinder. The circumferentially arranged reinforcing ribs effectively improve the circumferential deformation resistance of the fixed cylinder, preventing circumferential expansion or contraction deformation under internal pressure or external impact. The uniformly distributed reinforcing ribs provide uniform support to the inner wall of the fixed cylinder, reducing localized indentations and further improving the reinforcement structure system of the fixed cylinder, thus enhancing its overall load-bearing capacity.

[0018] Preferably, the reinforcing transverse ribs and reinforcing annular ribs are connected, and the reinforcing transverse ribs and reinforcing annular ribs form a mesh-like reinforcing member. The mesh-like reinforcing member achieves the synergistic effect of axial and circumferential reinforcement structures, which evenly improves the structural rigidity of the fixed cylinder in all directions. It effectively solves the problem of insufficient overall rigidity and easy resonance during operation caused by the single-direction reinforcement of traditional fixed cylinders. The mesh-like structure can evenly distribute external forces to the entire cavity of the fixed cylinder, avoid local force concentration, and significantly improve the vibration resistance and structural stability of the fixed cylinder, meeting the high stability operation requirements of the equipment.

[0019] Preferably, a damping noise reduction plate is added to the inner wall of the fixed cylinder, and the surface of the damping noise reduction plate has a corrugated design. The damping noise reduction plate can effectively absorb the noise generated by airflow and mechanical vibration during the operation of the fixed cylinder, reducing the noise pollution of the equipment. The corrugated design of its surface increases the contact area with airflow and vibration waves, improves the absorption efficiency of noise and vibration energy, and further enhances the noise reduction effect. At the same time, the damping noise reduction plate can also protect the inner wall of the fixed cylinder, reduce the wear of the inner wall caused by airflow impact, extend the service life of the fixed cylinder, and meet the environmental protection requirements of low noise of the equipment.

[0020] Preferably, the surface of the damping noise reduction plate has corresponding connection holes, and bolts are installed inside the connection holes. The damping noise reduction plate is connected to the inner wall of the fixed cylinder through the bolts. The bolt connection method ensures the firmness of the connection between the damping noise reduction plate and the inner wall of the fixed cylinder, preventing it from loosening or falling off due to vibration during equipment operation, thus ensuring the continuous effectiveness of the noise reduction function. At the same time, the bolt connection facilitates the installation, disassembly, and maintenance of the damping noise reduction plate. When the damping noise reduction plate is damaged or aged, it can be quickly replaced, reducing the maintenance difficulty and cost of the equipment, without changing the internal structure and core function of the fixed cylinder.

[0021] Compared with the prior art, the present invention provides a large-scale power plant adjustable axial flow induced draft fan with the following advantages:

[0022] The large power plant uses an adjustable axial flow induced draft fan. After the dustproof plate is attached to the first side connecting plate, the insertion guide post in the guide hole can be quickly inserted into the insertion hole of the dustproof plate under the elastic force of the compression spring. The initial positioning of the dustproof plate and the first side connecting plate can be achieved without additional complicated operations, which simplifies the installation and positioning process of the dustproof plate and improves the ease of operation.

[0023] The threaded rod can be rotated by the external rotating handle, which in turn controls the sliding block to rise and fall along the threaded rod. During the descent of the sliding block, the side rotating plate can be driven to rotate from a vertical state to a horizontal state, so that the lower part of the side rotating plate is tightly attached to the upper part of the dustproof plate, realizing a stable lock between the dustproof plate and the first side connecting plate. The locking structure is simple and reliable, effectively preventing the dustproof plate from loosening or shifting during the operation of the induced draft fan, ensuring the dustproof effect and installation stability of the dustproof plate.

[0024] The dustproof plate installed on the outer side of the first connecting plate can form a dustproof protection for the area corresponding to the air inlet end of the fixed cylinder, prevent external impurities from entering the interior of the fixed cylinder, reduce the adverse effects of impurities on the operation of the blade shaft and moving blades, and ensure the stable operation of the adjustable axial flow induced draft fan for large power plants. Attached Figure Description

[0025] Figure 1 This is a schematic diagram of the overall structure of the present invention;

[0026] Figure 2 This is a schematic diagram of the internal structure of the fixed cylinder of the present invention;

[0027] Figure 3 This is a schematic diagram of the internal structure of the fixed cylinder on the right side of the present invention;

[0028] Figure 4 This is a schematic diagram of the guide hole and its connection structure of the present invention;

[0029] Figure 5 This is a schematic diagram of the threaded rod and its connection structure of the present invention;

[0030] Figure 6 This is a schematic cross-sectional view of the chamber portion of the present invention.

[0031] In the diagram: 1. Fixed cylinder; 2. First side connecting plate; 3. Second side connecting plate; 4. Guide hole; 5. Insertion guide post; 6. Compression spring; 7. Threaded rod; 8. Outer rotating handle; 9. Sliding block; 10. Side rotating clamping plate; 11. Dustproof plate; 12. Insertion hole; 13. Chamber; 14. Fixed post; 15. Sliding plate; 16. Return spring; 17. Dust scraper; 18. Blade shaft; 19. Moving blade; 20. Drive motor; 21. Reinforcing horizontal rib; 22. Reinforcing ring rib; 23. Damping noise reduction plate. Detailed Implementation

[0032] 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.

[0033] This invention provides a technical solution: a large-scale power plant adjustable-blade axial-flow induced draft fan, comprising: (See attached image) Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 5 and Figure 6 The fixed cylinder 1, and a first side connecting plate 2 and a second side connecting plate 3 respectively provided at the air inlet end and air outlet end of the fixed cylinder 1, and a blade shaft 18 is rotatably connected to the inner cavity of the fixed cylinder 1, and a moving blade 19 is provided on the surface of the blade shaft 18, and an adjustment locking component is provided between the moving blade 19 and the blade shaft 18, and a drive motor 20 is coaxially connected to the end of the blade shaft 18, and a coupling is provided between the blade shaft 18 and the drive motor 20. A dustproof plate 11 is provided on the outer side of the first side connecting plate 2, and a plug hole 12 is opened on the side of the dustproof plate 11.

[0034] The guide hole 4 is opened on the side of the first side connecting plate 2, and the upper part of the inner cavity of the guide hole 4 is slidably connected to the insertion guide post 5, and a compression spring 6 is added between the bottom end of the guide hole 4 and the bottom of the inner cavity of the guide hole 4, and the insertion guide post 5 is inserted and connected to the insertion hole 12.

[0035] The threaded rod 7 is rotatably connected to the top of the plug-in guide post 5, and an outer rotating handle 8 is installed at the top of the threaded rod 7. A sliding block 9 is threadedly engaged with the surface of the threaded rod 7, and side rotating plates 10 are rotatably connected to the lower parts of both sides of the sliding block 9. A limiting component is added between the sliding block 9 and the plug-in guide post 5.

[0036] After the dustproof plate 11 is attached to the first side connecting plate 2, the fixed cylinder 1 is fixed by connecting to the corresponding position through the second side connecting plate 3. The compression spring 6 in the guide hole 4 drives the insertion guide post 5 to be inserted into the insertion hole 12 of the dustproof plate 11. The threaded rod 7 is rotated by the outer rotating handle 8, the threaded rod 7 drives the sliding block 9 to descend, and the sliding block 9 drives the side rotating plates 10 on both sides to rotate.

[0037] When the bottom of the side-turning plate 10 contacts the top of the insertion guide post 5, the side-turning plate 10 changes from a vertical state to a horizontal state, and the lower part of the side-turning plate 10 fits tightly against the upper part of the dustproof plate 11; during this process, the limiting member between the sliding block 9 and the insertion guide post 5 limits the movement of the sliding block 9.

[0038] The drive motor 20 drives the blade shaft 18 to rotate through the coupling, and the blade shaft 18 drives the moving blade 19 to rotate. The adjustment locking component between the moving blade 19 and the blade shaft 18 locks the position of the moving blade 19, ensuring that the moving blade 19 rotates stably with the blade shaft 18 to achieve the air induced function.

[0039] The dustproof plate 11 can effectively block external dust from entering the interior of the fixed cylinder 1, prevent dust from adhering to the surface of core rotating components such as the blade shaft 18 and the moving blade 19, reduce component wear, extend the service life of the induced draft fan, and ensure the stable operation of the induced draft fan under complex working conditions in large power plants.

[0040] The initial positioning is achieved by the compression spring 6 driving the insertion guide post 5, and then the secondary fixation is achieved by the outer rotating handle 8, the threaded rod 7 and the sliding block 9 driving the side rotating clamping plate 10. The double fixing structure can ensure that the dustproof plate 11 is tightly connected to the first side connecting plate 2, and prevent the dustproof plate 11 from loosening under the vibration generated by the operation of the induced draft fan. At the same time, the fixing structure is simple to operate, which facilitates the installation and disassembly of the dustproof plate 11 and reduces the difficulty of later maintenance.

[0041] The drive motor 20 drives the blade shaft 18 to rotate through the coupling. The coupling can effectively buffer the vibration during operation, reduce the energy loss during power transmission, and ensure the smooth rotation of the blade shaft 18. When the blade shaft 18 drives the moving blade 19 to rotate, adjusting the locking part can ensure that the moving blade 19 is firmly connected to the blade shaft 18, prevent the moving blade 19 from shifting, and ensure the stability of the induced draft efficiency.

[0042] The limiting component between the sliding block 9 and the plug-in guide post 5 can effectively limit the downward stroke of the sliding block 9, avoid excessive downward movement of the sliding block 9 which would cause excessive force to damage the side rotation plate 10, and prevent the side rotation plate 10 from sticking too tightly to the dustproof plate 11, thus deforming the dustproof plate 11 and further improving the overall operational safety of the structure.

[0043] The position of the moving blade 19 can be adjusted and locked by adjusting the locking component, so that the induced draft fan can adjust the angle of the moving blade 19 according to the different operating load requirements of large power plants, thereby adjusting the induced draft volume, improving the adaptability of the induced draft fan to the operating conditions, and reducing energy consumption.

[0044] Please see Figure 6 The dustproof plate 11 has chambers 13 at both the upper and lower parts of its inner cavity, and a fixing post 14 is added laterally to the inner cavity of each chamber 13. By opening chambers 13 at the upper and lower parts of the inner cavity of the dustproof plate 11 and adding fixing posts 14 laterally to the inner cavity of each chamber 13, a foundation for installation and support of subsequent related components is provided. The opening of chambers 13 provides suitable installation space for fixing posts 14, avoiding collision damage caused by exposed fixing posts 14. The laterally arranged fixing posts 14 can enhance the overall structural strength of the dustproof plate 11, prevent the dustproof plate 11 from warping and deforming due to uneven stress during long-term use, and at the same time provide a stable load-bearing carrier for the subsequent assembly of sliding plate 15, ensuring the assembly accuracy of dustproof related components.

[0045] A sliding plate 15 is sleeved and connected to the surface of the fixed column 14, and the surface of the sliding plate 15 slides in contact with the inner wall of the chamber 13. The sliding plate 15, by being sleeved and connected to the surface of the fixed column 14, can slide laterally along the fixed column 14. Simultaneously, the sliding contact between the surface of the sliding plate 15 and the inner wall of the chamber 13 ensures smooth sliding. The sleeved connection between the sliding plate 15 and the fixed column 14 limits the movement trajectory of the sliding plate 15, preventing it from shifting or misaligning during sliding. The sliding contact design between the sliding plate 15 and the inner wall of the chamber 13 reduces gaps during sliding, improving the stability of the movement. The inner wall of the chamber 13 guides and limits the sliding plate 15, preventing excessive sliding or shaking, thus ensuring the stable implementation of subsequent dust scraping actions.

[0046] A return spring 16 is fitted onto the surface of the fixed column 14, with both ends of the return spring 16 respectively abutting against the inner wall of the chamber 13 and the corresponding surface of the fixed column 14. When the sliding plate 15 slides along the fixed column 14, it squeezes or stretches the return spring 16. The elastic deformation of the return spring 16 generates a reverse force, causing the sliding plate 15 to return to its initial position. The return spring 16 enables the automatic reset function of the sliding plate 15 without the need for an additional drive mechanism, simplifying the overall structural complexity and reducing equipment maintenance costs. The abutting design of both ends of the return spring 16 against the inner wall of the chamber 13 and the corresponding surface of the fixed column 14 ensures uniform force on the spring, preventing misalignment or jamming during deformation, ensuring the reliability and stability of the reset function, and improving the automated operation efficiency of the dustproof structure.

[0047] A dust scraper 17 is slidably attached to the front of the dustproof plate 11, and the dust scraper 17 is connected to the sliding plate 15. When the sliding plate 15 slides along the fixed column 14, it drives the dust scraper 17 to slide on the front of the dustproof plate 11 through its connection with the dust scraper 17. The linkage design between the dust scraper 17 and the sliding plate 15 allows the dust scraping action to be achieved by the movement of the sliding plate 15, eliminating the need for a separate dust scraping drive structure, thus optimizing the spatial layout. The sliding attachment design between the dust scraper 17 and the dustproof plate 11 can thoroughly scrape away the dust adhering to the surface of the dustproof plate 11, preventing dust accumulation from affecting the dustproof effect and improving the ease of operation and maintenance of the equipment.

[0048] Please see Figure 3 The inner cavity of the fixed cylinder 1 is uniformly reinforced with reinforcing ribs 21, which are arranged along the axial direction of the fixed cylinder 1. By uniformly adding reinforcing ribs 21 to the inner cavity of the fixed cylinder 1 and arranging them along the axial direction, the structural load-bearing capacity of the fixed cylinder 1 in the axial direction is enhanced. The axially arranged reinforcing ribs 21 can effectively disperse the external force on the fixed cylinder 1 in the axial direction, improve the axial structural rigidity of the fixed cylinder 1, and prevent it from undergoing tensile or compressive deformation due to excessive axial force during long-term operation. The uniformly distributed design ensures that the inner cavity of the fixed cylinder 1 is subjected to balanced force, prevents damage due to concentrated force in local areas, and extends the service life of the fixed cylinder 1.

[0049] The inner cavity of the fixed cylinder 1 is uniformly reinforced with reinforcing ribs 22, which are arranged circumferentially around the fixed cylinder 1. By uniformly adding reinforcing ribs 22 to the inner cavity of the fixed cylinder 1 and arranging them circumferentially, the structural stability of the fixed cylinder 1 in the circumferential direction is enhanced. The circumferentially arranged reinforcing ribs 22 can effectively improve the circumferential deformation resistance of the fixed cylinder 1, preventing circumferential expansion or contraction deformation under internal pressure or external impact. The uniformly distributed reinforcing ribs 22 can provide uniform support to the inner wall of the fixed cylinder 1, reducing local depressions in the inner wall, further improving the reinforcement structure system of the fixed cylinder 1, and enhancing its overall load-bearing capacity.

[0050] The reinforcing horizontal ribs 21 and the reinforcing ring ribs 22 are connected, forming a grid-like reinforcement. By connecting the reinforcing horizontal ribs 21 and the reinforcing ring ribs 22 to form a grid-like reinforcement, they jointly bear various external forces on the fixed cylinder 1. The grid-like reinforcement achieves the synergistic effect of axial and circumferential reinforcement structures, which evenly improves the structural rigidity of the fixed cylinder 1 in all directions. This effectively solves the problem of insufficient overall rigidity and easy resonance during operation caused by the traditional single-direction reinforcement of the cylinder. The grid-like structure can evenly distribute external forces to the entire cavity of the fixed cylinder 1, avoiding local force concentration, significantly improving the vibration resistance and structural stability of the fixed cylinder 1, and meeting the high stability operation requirements of the equipment.

[0051] A damping noise reduction plate 23 is added to the inner wall of the fixed cylinder 1, and the surface of the damping noise reduction plate 23 is corrugated. By adding the damping noise reduction plate 23 to the inner wall of the fixed cylinder 1, the corrugated surface design absorbs the noise and vibration energy generated during equipment operation. The damping noise reduction plate 23 is made of a composite material of nitrile rubber and steel plate. The damping noise reduction plate 23 can effectively absorb the noise generated by airflow and mechanical vibration during the operation of the fixed cylinder 1, reducing the noise pollution of equipment operation. Its corrugated surface design increases the contact area with airflow and vibration waves, improves the absorption efficiency of noise and vibration energy, and further enhances the noise reduction effect. At the same time, the damping noise reduction plate 23 can also protect the inner wall of the fixed cylinder 1, reduce the wear of the inner wall caused by airflow impact, extend the service life of the fixed cylinder 1, and meet the environmental protection requirements of low noise of equipment.

[0052] The damping noise reduction plate 23 has corresponding connection holes on its surface, and bolts are installed inside the connection holes. The damping noise reduction plate 23 is connected to the inner wall of the fixed cylinder 1 by the bolts. By opening connection holes on the surface of the damping noise reduction plate 23 and adding bolts inside the connection holes, the damping noise reduction plate 23 is stably connected to the inner wall of the fixed cylinder 1. The bolt connection method ensures the firmness of the connection between the damping noise reduction plate 23 and the inner wall of the fixed cylinder 1, preventing it from loosening or falling off due to vibration during equipment operation, thus ensuring the continuous effectiveness of the noise reduction function. At the same time, the bolt connection facilitates the installation, disassembly, and maintenance of the damping noise reduction plate 23. When the damping noise reduction plate 23 is damaged or aged, it can be quickly replaced, reducing the maintenance difficulty and cost of the equipment, without changing the internal structure and core function of the fixed cylinder 1.

[0053] This solution involves attaching the dustproof plate 11 to the first side connecting plate 2, and using the second side connecting plate 3 to drive the fixed cylinder 1 to be connected and fixed at the corresponding location; the compression spring 6 in the guide hole 4 drives the insertion guide post 5 to be inserted into the insertion hole 12 of the dustproof plate 11, thereby achieving the initial positioning of the dustproof plate 11.

[0054] The outer rotating handle 8 drives the threaded rod 7 to rotate, the threaded rod 7 drives the sliding block 9 to descend, and the sliding block 9 drives the side rotating plates 10 on both sides to rotate; when the bottom of the side rotating plate 10 contacts the top of the insertion guide post 5, the side rotating plate 10 changes from a vertical state to a horizontal state, and the lower part of the side rotating plate 10 is tightly fitted with the upper part of the dustproof plate 11; during this process, the limiting component between the sliding block 9 and the insertion guide post 5 drives itself to limit the movement of the sliding block 9;

[0055] The drive motor 20 drives the blade shaft 18 to rotate through the coupling, and the blade shaft 18 drives the moving blade 19 to rotate. The adjusting locking component between the moving blade 19 and the blade shaft 18 locks the position of the moving blade 19, ensuring that the moving blade 19 rotates stably with the blade shaft 18 and realizes the induced draft function. If the induced draft volume needs to be adjusted, the angle of the moving blade 19 is adjusted by adjusting the locking component to adapt to different operating load requirements.

[0056] The sliding plate 15 slides laterally along the fixed column 14, and the sliding plate 15 drives the dust scraper 17 to slide on the front of the dustproof plate 11. When the sliding plate 15 slides, it squeezes or stretches the return spring 16. The return spring 16 generates a reverse force through elastic deformation, which drives the sliding plate 15 to return to the initial position.

[0057] During equipment operation, the grid-like reinforcing members formed by the reinforcing transverse ribs 21 and reinforcing ring ribs 22 inside the fixed cylinder 1 drive themselves to bear various external forces on the fixed cylinder 1; the damping noise reduction plate 23 on the inner wall of the fixed cylinder 1 drives itself to absorb the noise and vibration energy generated during operation; when the damping noise reduction plate 23 needs maintenance, the bolts inside the connecting hole are removed, causing the damping noise reduction plate 23 to separate from the inner wall of the fixed cylinder 1, and it can be replaced or repaired and then re-fixed with bolts.

[0058] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0059] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A large-scale power plant adjustable-blade axial-flow induced draft fan, characterized in that, include: A fixed cylinder (1) and a first side connecting plate (2) and a second side connecting plate (3) respectively provided at the air inlet and air outlet of the fixed cylinder (1). The inner cavity of the fixed cylinder (1) is rotatably connected to a blade shaft (18), and a moving blade (19) is added to the surface of the blade shaft (18). An adjustment locking component is added between the moving blade (19) and the blade shaft (18). A drive motor (20) is coaxially connected to the end of the blade shaft (18), and a coupling is added between the blade shaft (18) and the drive motor (20). A dustproof plate (11) is added to the outer side of the first side connecting plate (2), and a plug hole (12) is opened on the side of the dustproof plate (11). A guide hole (4) is opened on the side of the first side connecting plate (2), and a plug-in guide post (5) is slidably connected to the upper part of the inner cavity of the guide hole (4). A compression spring (6) is added between the bottom end of the guide hole (4) and the bottom of the inner cavity of the guide hole (4), and the plug-in guide post (5) is plugged into the plug-in hole (12). A threaded rod (7) is rotatably connected to the top of the plug-in guide post (5), and an outer rotating handle (8) is installed at the top of the threaded rod (7). A sliding block (9) is threadedly engaged with the surface of the threaded rod (7), and a side rotating plate (10) is rotatably connected to the lower part of both sides of the sliding block (9). A limiting member is added between the sliding block (9) and the plug-in guide post (5).

2. The adjustable-blade axial-flow induced draft fan for large power plants according to claim 1, characterized in that: The dustproof plate (11) has a cavity (13) in the upper and lower parts of its inner cavity, and a fixing column (14) is added horizontally to the inner cavity of the cavity (13).

3. The adjustable-blade axial-flow induced draft fan for large power plants according to claim 2, characterized in that: The surface of the fixed column (14) is fitted with a sliding plate (15), and the surface of the sliding plate (15) slides against the inner wall of the chamber (13).

4. A large-scale power plant adjustable-blade axial-flow induced draft fan according to claim 3, characterized in that: A return spring (16) is sleeved on the surface of the fixed column (14), and the two ends of the return spring (16) are respectively attached to the inner side wall of the chamber (13) and the corresponding surface of the fixed column (14).

5. A large-scale power plant adjustable-blade axial-flow induced draft fan according to claim 4, characterized in that: The dustproof plate (11) has a dust scraper (17) slidably attached to its front side, and the dust scraper (17) is connected to the sliding plate (15).

6. A large-scale power plant adjustable-blade axial-flow induced draft fan according to claim 1, characterized in that: The inner cavity of the fixed cylinder (1) is uniformly provided with reinforcing ribs (21), and the reinforcing ribs (21) are arranged along the axial direction of the fixed cylinder (1).

7. A large-scale power plant adjustable-blade axial-flow induced draft fan according to claim 6, characterized in that: The inner cavity of the fixed cylinder (1) is uniformly provided with reinforcing ring ribs (22), and the reinforcing ring ribs (22) are arranged along the circumference of the fixed cylinder (1).

8. A large-scale power plant adjustable-blade axial-flow induced draft fan according to claim 7, characterized in that: The reinforcing transverse rib (21) is connected to the reinforcing ring rib (22), and the reinforcing transverse rib (21) and the reinforcing ring rib (22) form a grid-like reinforcing member.

9. A large-scale power plant adjustable-blade axial-flow induced draft fan according to claim 1, characterized in that: The inner wall of the fixed cylinder (1) is provided with a damping noise reduction plate (23), and the surface of the damping noise reduction plate (23) is corrugated.

10. A large-scale power plant adjustable-blade axial-flow induced draft fan according to claim 9, characterized in that: The damping noise reduction plate (23) has a corresponding connection hole on its surface, and a bolt is added to the inner cavity of the connection hole. The damping noise reduction plate (23) is connected to the inner wall of the fixed cylinder (1) by the bolt.

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