Sealing fin of boiler air preheater

Abstract

The invention discloses a boiler air preheater sealing piece which comprises a moving assembly, a sealing shell, a pressing piece arranged in the sealing shell and capable of moving along the sealing shell, and a first elastic piece arranged at the bottom of the pressing piece. The connecting assembly is connected with the bottom of the moving assembly, and the moving assembly can slide along the connecting assembly; when the moving assembly slides downwards along the connecting assembly, the pressing piece pushes the first elastic piece to be clamped to the outer wall of the connecting assembly, and when the pressing piece moves upwards, the first elastic piece can be separated from the outer wall of the connecting assembly, so that the moving assembly can be separated from the connecting assembly. A traditional welding fixing mode is replaced through the synergistic effect of the pressing piece and the first elastic piece, the sealing piece can be rapidly disassembled and assembled by means of the handle, welding seams do not need to be cut, and the technical problems that a traditional sealing plate is tedious to disassemble and assemble, and an air pre-heater body is prone to being damaged are solved.

Description

Technical Field

[0001] This invention relates to the field of air preheater sealing sheets, and in particular to a boiler air preheater sealing sheet. Background Technology

[0002] The boiler air preheater is a key component of the boiler. Its core function is to use the waste heat of high-temperature flue gas to heat the cold air entering the boiler, thereby improving the boiler's thermal efficiency and reducing heat waste. In order to isolate the flue gas inside the boiler air preheater from the air, a sealing plate is installed on the rotor. These plates are mostly made of heat-resistant metal plates. Some are flat, while others have folded edges or designed positioning protrusions according to installation requirements. The sealing is mainly achieved by the hardness of the plate itself and the installation precision.

[0003] However, the sealing plate is prone to wear during operation. For example, fly ash carried in high-temperature flue gas will continuously wash the plate, and the plate will gradually become thinner over time. Also, when the rotor rotates, the sealing plate will rub against the fan-shaped plate on top, resulting in wear on the edge of the sealing plate.

[0004] To prevent the rotor's sealing performance from deteriorating, the sealing plates on the rotor are usually replaced periodically. However, most of the current sealing plates are directly welded to the air preheater's frame or shell. When the sealing plate needs to be replaced due to wear, the weld must be cut or ground off first. This is not only time-consuming and labor-intensive, but may also accidentally damage the air preheater's own components, ultimately leading to extended equipment downtime and increased maintenance costs, making it difficult to meet the needs of efficient daily operation and maintenance. Summary of the Invention

[0005] Therefore, the technical problem to be solved by the present invention is that the existing sealing plate is cumbersome to disassemble and assemble, and is prone to damaging the components of the air preheater itself.

[0006] The above-mentioned technical problems are solved by the following technical solution: The present invention proposes a boiler air preheater sealing sheet, which includes a movable component, including a sealing shell, a pressing member disposed in the sealing shell and movable along the sealing shell, and a first elastic member disposed at the bottom of the pressing member; A connecting component is connected to the bottom of the movable component, and the movable component can slide along the connecting component; wherein, When the moving component slides downward along the connecting component, the pressing member pushes the first elastic member to engage with the outer wall of the connecting component. When the pressing member moves upward, the first elastic member can disengage from the outer wall of the connecting component, allowing the moving component to separate from the connecting component.

[0007] In a preferred embodiment of the boiler air preheater sealing sheet of the present invention: the pressing member includes a ring, an inclined groove formed at the bottom of the ring, a connecting piece disposed on one side of the ring, and a handle disposed on the side of the connecting piece away from the ring.

[0008] In a preferred embodiment of the boiler air preheater sealing sheet of the present invention: a groove is provided on one side of the sealing shell, the connecting piece passes through the groove and can slide within the groove, and the side of the handle near the ring is slidably connected to the outer wall of the sealing shell.

[0009] In a preferred embodiment of the boiler air preheater sealing sheet of the present invention: a second elastic element is provided at the top of the ring, and the top of the second elastic element is connected to the inner wall of the sealing shell.

[0010] In a preferred embodiment of the boiler air preheater sealing sheet of the present invention: the first elastic element includes an elastic frame, a circular block disposed at the bottom of the elastic frame near the connecting assembly, and a sliding piece disposed at the bottom of the elastic frame away from the circular block.

[0011] In a preferred embodiment of the boiler air preheater sealing sheet of the present invention: the connecting assembly includes a support for supporting the sealing shell, an engagement groove formed on the top of the support, a guide block disposed on the inner wall of the engagement groove, and a circular groove disposed on the bottom of the guide block.

[0012] In a preferred embodiment of the boiler air preheater sealing sheet of the present invention: the sealing shell can slide along the support base, and when the sealing shell slides downward along the support base, the elastic frame squeezes the guide block and makes the round block engage with the round groove.

[0013] In a preferred embodiment of the boiler air preheater sealing sheet of the present invention: a sliding groove is provided at the bottom of the sealing shell, the sliding sheet can slide along the inner wall of the sliding groove, and a gap is left between the side of the sliding sheet facing the sealing shell and the inner wall of the sliding groove.

[0014] In a preferred embodiment of the boiler air preheater sealing sheet of the present invention: the inner wall of the sealing shell is provided with a positioning element for locking the sliding range of the sealing shell, the positioning element including a movable tube connected to the inner wall of the sealing shell, and an elastic block disposed on one side of the movable tube.

[0015] In a preferred embodiment of the boiler air preheater sealing sheet of the present invention: a fixing plate is provided on one side of the elastic frame, the top of the elastic frame is a circular structure, and the movable tube can pass through the top of the elastic frame to make the elastic block engage with the fixing plate.

[0016] The beneficial effects of this invention are as follows: by replacing the traditional welding fixing method with the synergistic action of the pressing component and the first elastic component, the sealing plate can be quickly disassembled and assembled with the help of the handle, without the need to cut the weld seam. This solves the technical problem of the traditional sealing plate being cumbersome to disassemble and assemble and easily damaging the air preheater body. At the same time, through the interlocking structure of the moving tube and the elastic block, the sliding range of the sealing shell is precisely limited, reducing the frictional wear between the sealing shell and the fan-shaped plate and internal components, thus extending the service life of the equipment while ensuring stable sealing performance. Attached Figure Description

[0017] To more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings of the embodiments of the present invention will be briefly described below. Obviously, the drawings described below only relate to some embodiments of the present invention and are not intended to limit the present invention. Wherein: Figure 1 The overall structure diagram is shown; Figure 2 A connection diagram of the moving component and the connecting component is shown; Figure 3 A structural diagram of the moving component is shown; Figure 4 A cross-sectional view of the moving component and the connecting component is shown; Figure 5 A structural diagram of the pressing component is shown; Figure 6 The connection diagram between the pressing element and the first elastic element is shown; Figure 7 A structural diagram of the positioning component is shown; Figure 8 A cross-sectional view of the connecting components is shown. Detailed Implementation

[0018] To enable those skilled in the art to better understand the present invention, the present invention will be further described in detail below with reference to specific embodiments and accompanying drawings.

[0019] The terminology used in this invention is that which is currently widely used in the art in consideration of the function of the invention; however, these terms may vary according to the intent of those skilled in the art, precedent, or new technology in the art. Furthermore, specific terms may be chosen by the applicant, and in such cases, their detailed meanings will be described in the detailed description of the invention. Therefore, the terms used in this specification should not be construed as simple names, but rather based on their meanings and the overall description of the invention.

[0020] Reference Figures 1-8 This embodiment provides a boiler air preheater sealing sheet, comprising: The movable component 1 includes a sealing shell 11, a pressing member 12 disposed within the sealing shell 11 and movable along the sealing shell 11, and a first elastic member 13 disposed at the bottom of the pressing member 12. The pressing member 12 is engaged within the sealing shell 11 and can slide along the inner wall of the sealing shell 11. The first elastic member 13 is also engaged within the sealing shell 11, located below the pressing member 12, and in direct contact with the bottom of the pressing member 12. The key feature is that the top of the pressing member 12 is provided with a second elastic member 15. Under normal circumstances, the second elastic member 15 is always in a slightly compressed state, continuously applying a downward pushing force to the pressing member 12, so that the pressing member 12 keeps pressing the top of the first elastic member 13, thereby making the elastic structure of the first elastic member 13 always have a tendency to contract inward. When the pressing member 12 slides downward under external force, it will further compress the first elastic member 13, causing it to slide downward along the sealing shell 11, while strengthening its inward contraction deformation. It also includes a connecting component 2 connected to the bottom of the movable component 1. The movable component 1 can slide along the connecting component 2. When the movable component 1 and the connecting component 2 are installed, the sealing shell 11 gradually moves closer to the connecting component 2. At this time, the first elastic member 13 first contacts the surface of the connecting component 2. As the sealing shell 11 continues to move downward, the elastic structure of the first elastic member 13 is slightly deformed under the guidance of the connecting component 2. At the same time, the second elastic member 15 pushes the pressing member 12 to continuously squeeze the first elastic member 13, so that the first elastic member 13 contracts towards the connecting component 2 by its own elastic force. Finally, its bottom structure and the connecting component 2 are engaged with each other, realizing the connection between the movable component 1 and the connecting component 2. At this time, since both the first elastic member 13 and the pressing member 12 can slide along the movable component 1, and the second elastic member 15 maintains continuous pressure, the movable component 1 can slide stably relative to the connecting component 2, while avoiding accidental disengagement of the engaging structure.

[0021] When the moving component 1 slides downward along the connecting component 2, the pressing member 12 pushes the first elastic member 13 to engage with the outer wall of the connecting component 2. When the pressing member 12 moves upward, the first elastic member 13 can disengage from the outer wall of the connecting component 2, so that the moving component 1 can be separated from the connecting component 2.

[0022] It should be noted that when the pressing member 12 is lifted, the pressing member 12 will compress the second elastic member 15 upward and no longer apply pressure to the first elastic member 13. At this time, after the first elastic member 13 loses its compression, it gradually returns to its original shape under its own elastic force and moves away from the connecting component 2. The two no longer have a fixed relationship. However, separation cannot be achieved by simply lifting the pressing member 12. The sealing shell 11 needs to be lifted further upward to drive the moving component 1 to slide upward along the connecting component 2 in order to complete the separation operation.

[0023] As an optional embodiment, the process of assembling and separating the movable component 1 and the connecting component 2 is specifically described.

[0024] The pressing component 12 includes a ring 121, a sloping groove 122 formed at the bottom of the ring 121, a connecting piece 123 provided on one side of the ring 121, and a handle 124 provided on the side of the connecting piece 123 away from the ring 121. The connecting pieces 123 are welded to both sides of the ring 121, and the handle 124 is bolted to the side of the connecting piece 123 away from the ring 121. At the bottom of the ring 121, an upwardly inclined annular groove 122 is formed on the inner ring. The function of the groove 122 is to reduce the wear and tear caused when the ring 121 presses against other components.

[0025] It should be noted that the first elastic element 13 is set in the circular hole of the ring 121. When the second elastic element 15 pushes the ring 121 downward, the ring 121 will continuously squeeze the two sides of the first elastic element 13, so that the first elastic element 13 maintains the tendency to contract inward, and thus achieves engagement by its own elastic force.

[0026] A slot 14 is provided on one side of the sealing shell 11, and a connecting piece 123 passes through the slot 14 and can slide within the slot 14. The handle 124 is slidably connected to the outer wall of the sealing shell 11 on the side near the ring 121. Both sides of the sealing shell 11 are provided with slots 14 corresponding to the connecting piece 123. The connecting piece 123 passes through the slot 14, and its end located outside the sealing shell 11 is connected to the handle 124. Therefore, the handle 124 can be pushed to drive the ring 121 and the connecting piece 123 to move.

[0027] The top of the ring 121 is provided with a second elastic element 15, the top of the second elastic element 15 is connected to the inner wall of the sealing shell 11, wherein the second elastic element 15 is a threaded spring, the top of the ring 121 is provided with a circular frame for engaging with the bottom of the second elastic element 15, and the top of the second elastic element 15 abuts against the top of the inner wall of the sealing shell 11.

[0028] Under normal circumstances, the second elastic element 15 is always in a slightly compressed state, continuously applying a downward thrust to the ring 121, so that the ring 121 keeps pressing against the top of the first elastic element 13, thereby making the elastic piece of the first elastic element 13 always tend to contract inward, ensuring that its bottom round block 132 is tightly engaged with the round groove 24 of the connecting component 2, and preventing the two from accidentally separating; when the handle 124 is pulled upward, the ring 121 moves upward and further compresses the second elastic element 15, temporarily releasing the pressure on the first elastic element 13.

[0029] The first elastic component 13 includes an elastic frame 131, a circular block 132 disposed at the bottom of the elastic frame 131 near the connecting component 2, and a sliding piece 133 disposed at the bottom of the elastic frame 131 away from the circular block 132. The top of the elastic frame 131 is a ring-shaped structure, and the bottom of the left and right sides of the ring are provided with outwardly inclined elastic pieces. The inner side of the elastic piece is connected to the circular block 132, and the outer side is connected to the sliding piece 133. The top diameter of the elastic frame 131 is smaller than the diameter of the circular hole of the ring 121, and the ring 121 is sleeved on the outer wall of the elastic frame 131. When the second elastic element 15 pushes the ring 121 downward, the ring 121 will continuously squeeze the elastic sheet of the elastic frame 131, so that the elastic sheet of the elastic frame 131 maintains the deformation tendency of contracting inward, thereby pushing the round block 132 towards the connecting component 2; when the ring 121 moves upward and releases the compression, the elastic sheet loses its pressure and can be driven by external force to disengage the round block 132 from the circular groove 24 of the connecting component 2.

[0030] The connecting assembly 2 includes a support base 21 for supporting the sealing shell 11, a locking groove 22 opened on the top of the support base 21, a guide block 23 disposed on the inner wall of the locking groove 22, and a circular groove 24 disposed on the bottom of the guide block 23. The support base 21 is used to connect the rotor and can be fixed to the rotor by welding. The locking groove 22 is generally arched. The guide block 23 is disposed in the locking groove 24 and its cross-sectional area is smaller than that of the support base 21. The top of the guide block 23 is rounded to guide the elastic plate of the elastic frame 131 to deform smoothly and lock into the circular groove 24.

[0031] The sealing shell 11 can slide along the support base 21. When the sealing shell 11 slides down along the support base 21, the elastic frame 131 presses the guide block 23 and makes the round block 132 engage with the round groove 24. When the sealing shell 11 is fitted onto the support base 21, the elastic frame 131 will enter the engaging groove 24. Then the elastic frame 131 will contact the guide block 23. The top of the guide block 23 is provided with rounded corners, which will guide the elastic piece of the elastic frame 131 to move to both sides of the guide block 23. When the sealing shell 11 continues to descend, the round block 132 at the bottom of the elastic frame 13 will move to the position of the round groove 24 and engage with the round groove 24. At this time, the entire elastic frame 13 is engaged with the guide block 23.

[0032] The bottom of the sealing shell 11 is provided with a sliding groove 16. The sliding piece 133 can slide along the inner wall of the sliding groove 16, and there is a gap between the side of the sliding piece 133 facing the sealing shell 11 and the inner wall of the sliding groove 16. When the round block 132 engages with the round groove 24 and no longer pushes the sealing shell 11, the second elastic element 15 will push the sealing shell 11 to move away from the support seat 21. Because the elastic frame 13 and the ring 121 are pushed downward by the second elastic element 15, the elastic frame 13 engages with the guide block 23, and its top is pressed by the ring 121, so it cannot detach from the guide block 23. The sealing shell 11 is supported by the second elastic element 15 and can move up and down relative to the elastic frame 13 and the ring 121.

[0033] When it is necessary to disassemble the sealing shell 11 and the support base 21, pinch the two handles 124 and lift the handles 123 to lift the ring 121 and compress the second elastic element 15, so that the ring 121 no longer squeezes the elastic frame 13. At this time, lift the sealing shell 11 with force, and the sliding piece 133 can be pulled through the sliding groove 16, so that the elastic frame 13 opens from the bottom, thereby separating the round block 132 from the round groove 24. In this way, the sealing shell 11 can be removed simply and quickly, thereby simplifying the disassembly process of the entire sealing sheet and saving disassembly and assembly time. At the same time, the sealing shell 11 can move relative to the support base 21 after installation, so that it can better fit with the sector plate when in contact with the sector plate, further improving the sealing effect.

[0034] As an alternative embodiment, a component for reducing frictional loss is provided.

[0035] The inner wall of the sealing shell 11 is provided with a positioning element 17 for locking the sliding range of the sealing shell 11. The positioning element 17 includes a moving tube 171 connected to the inner wall of the sealing shell 11, and an elastic block 172 disposed on one side of the moving tube 171. A fixing plate 134 is disposed on one side of the elastic frame 131. The top of the elastic frame 131 is a ring-shaped structure. The moving tube 171 can pass through the top of the elastic frame 131 to make the elastic block 172 engage with the fixing plate 134. When the rotor and the sealing plate rotate, the sealing plate will form a sealed space with the sector plate, thereby isolating air and flue gas. When the rotor drives the sealing shell 11 to rotate, although the sealing shell 11 can extend and retract relative to the support base 21, the excessive extension and retraction distance will increase the friction area between the sealing shell 11 and the sector plate, and will also increase the frictional wear between the internal components of the sealing shell 11.

[0036] Therefore, when the fan-shaped plate passes the top of the sealing shell 11, it will squeeze the top of the sealing shell 11. At this time, it will drive the moving tube 171 to insert into the ring at the top of the elastic frame 131, and make the elastic block 172 contact the fixing plate 134. The bottom of the elastic block 172 is provided with a slanted groove, which can help the elastic block 172 pass over the fixing plate 134, so that the top of the elastic block 172 and the fixing plate 134 are engaged with each other. There are several fixing plates 134 on the elastic frame 131, and there is a certain gap between each fixing plate 134. When the elastic block 172 is engaged with a certain fixing plate 134, the elastic block 172 can only slide in the gap between the fixing plate 134 and the bottom fixing plate 134. This limits the sliding range of the sealing shell 11, thereby preventing the sealing shell 11 from having too much sliding range, which would increase frictional wear.

[0037] Finally, it should be noted that the methods and devices described in detail above are merely embodiments, and those skilled in the art can modify these embodiments in different ways as long as they do not depart from the scope of the present invention.

Claims

1. A sealing sheet for a boiler air preheater, characterized in that: include, The movable component (1) includes a sealing shell (11), a pressing member (12) disposed inside the sealing shell (11) and movable along the sealing shell (11), and a first elastic member (13) disposed at the bottom of the pressing member (12). A connecting component (2) is connected to the bottom of the movable component (1), and the movable component (1) can slide along the connecting component (2); wherein, When the moving component (1) slides down along the connecting component (2), the pressing member (12) pushes the first elastic member (13) to engage with the outer wall of the connecting component (2). When the pressing member (12) moves up, the first elastic member (13) can disengage from the outer wall of the connecting component (2), so that the moving component (1) can be separated from the connecting component (2).

2. The boiler air preheater sealing sheet according to claim 1, characterized in that: The pressing member (12) includes a ring (121), a groove (122) formed at the bottom of the ring (121), a connecting piece (123) disposed on one side of the ring (121), and a handle (124) disposed on the side of the connecting piece (123) away from the ring (121).

3. The boiler air preheater sealing sheet according to claim 2, characterized in that: The sealing shell (11) has a slot (14) on one side, the connecting piece (123) passes through the slot (14) and the connecting piece (123) can slide in the slot (14), and the handle (124) near the ring (121) is slidably connected to the outer wall of the sealing shell (11).

4. The boiler air preheater sealing sheet according to claim 3, characterized in that: The top of the ring (121) is provided with a second elastic element (15), and the top of the second elastic element (15) is connected to the inner wall of the sealing shell (11).

5. The boiler air preheater sealing sheet according to claim 4, characterized in that: The first elastic element (13) includes an elastic frame (131), a circular block (132) disposed at the bottom of the elastic frame (131) near the connecting component (2), and a sliding piece (133) disposed at the bottom of the elastic frame (131) away from the circular block (132).

6. The boiler air preheater sealing sheet according to claim 5, characterized in that: The connecting assembly (2) includes a support base (21) for supporting the sealing shell (11), a locking groove (22) opened on the top of the support base (21), a guide block (23) disposed on the inner wall of the locking groove (22), and a circular groove (24) disposed on the bottom of the guide block (23).

7. The boiler air preheater sealing sheet according to claim 6, characterized in that: The sealing shell (11) can slide along the support base (21). When the sealing shell (11) slides down along the support base (21), the elastic frame (131) squeezes the guide block (23) and makes the round block (132) engage with the round groove (24).

8. The boiler air preheater sealing sheet according to claim 7, characterized in that: The bottom of the sealing shell (11) is provided with a sliding groove (16), and the sliding piece (133) can slide along the inner wall of the sliding groove (16), and there is a gap between the side of the sliding piece (133) facing the sealing shell (11) and the inner wall of the sliding groove (16).

9. The boiler air preheater sealing sheet according to claim 8, characterized in that: The inner wall of the sealing shell (11) is provided with a positioning element (17) for locking the sliding range of the sealing shell (11). The positioning element (17) includes a moving tube (171) connected to the inner wall of the sealing shell (11) and an elastic block (172) disposed on one side of the moving tube (171).

10. The boiler air preheater sealing sheet according to claim 9, characterized in that: A fixing plate (134) is provided on one side of the elastic frame (131). The top of the elastic frame (131) is a ring-shaped structure. The moving tube (171) can pass through the top of the elastic frame (131) to make the elastic block (172) engage with the fixing plate (134).

Images