A flexible seal for an air preheater

Abstract

This application relates to the field of air preheater sealing technology, and in particular to a flexible sealing device for an air preheater. It includes a sealing slider hinged to the upper end of a partition plate and a force-bearing plate whose sidewall is fixed to the surface of the partition plate. The force-bearing plate is horizontally positioned, and a connecting column is vertically positioned between the force-bearing plate and the sealing slider. A first mounting cylinder is fixedly connected to the surface of the sealing slider opposite to the force-bearing plate. A second mounting cylinder is fixedly connected to the upper end face of the connecting column. A hinge rod is slidably positioned inside the first mounting cylinder. A rotating column is coaxially rotatably positioned on the end face of the hinge rod near the second mounting cylinder. A sliding element is provided on the peripheral wall of the rotating column. A sliding groove connecting the two end faces is formed on the inner wall of the second mounting cylinder along its axial direction. The sliding element is adapted to the sliding groove and can slide within the sliding groove. A fixing groove is formed on the end face of the second mounting cylinder opposite to the first mounting cylinder. The sliding element is adapted to the fixing groove and can be inserted into the fixing groove, achieving the effect of convenient and quick maintenance or replacement of the spring.

Description

Technical Field

[0001] This application relates to the field of air preheater sealing technology, and in particular to a flexible sealing device for an air preheater. Background Technology

[0002] Currently, an air preheater is a heat exchange surface in the boiler tail flue where the flue gas is preheated to a certain temperature by internal heat exchange fins before entering the boiler. It is a device used to improve the heat exchange performance of the boiler and reduce energy consumption. When the air preheater rotor is running in a high-temperature environment, the temperature difference between the flue gas side and the air side causes "mushroom-shaped deformation". The radial end face bulges upward at the hot end and shrinks at the cold end, which causes the static gap between the traditional rigid sealing plate and the fixed sealing plate to expand under hot conditions, increasing the air leakage rate. Therefore, a flexible contact type is needed to seal the air preheater.

[0003] The existing flexible sealing device includes a slider for sealing, a limiting post hinged to the sealing slider, and a spring sleeved on the periphery of the limiting post. The slider is hinged to the upper end of the air preheater rotor compartment plate. The limiting post is rotatably inserted into a cylinder fixed to the lower surface of the slider and hinged to the slider through a pin fixed at the upper end. The spring provides elastic support for the slider, and the end of the pin is fixed by a nut.

[0004] The existing technical solutions mentioned above have the following drawbacks: After prolonged use, repeated compression of the springs leads to the loss of elasticity. Therefore, staff need to regularly inspect, repair, or replace the springs. Since the limit post and the slider are hinged together by pins and nuts, when repairing or replacing the hinge springs, staff need to use tools such as wrenches to disassemble them one by one. The number of hinge springs that provide elasticity to the slider is large, and the number of hinge springs that need to be repaired or replaced is large. The disassembly operation is cumbersome and inefficient. Utility Model Content

[0005] This application provides a flexible sealing device for an air preheater to facilitate quick and easy maintenance or replacement of springs.

[0006] The above-mentioned technical objective of this application is achieved through the following technical solution:

[0007] A flexible sealing device for an air preheater includes a sealing slider hinged to the upper end of a partition plate and a force-bearing plate whose sidewall is fixed to the surface of the partition plate. The force-bearing plate is horizontally arranged, and a connecting column is vertically arranged between the force-bearing plate and the sealing slider. A first mounting cylinder is fixedly connected to the surface of the sealing slider opposite to the force-bearing plate. A second mounting cylinder is fixedly connected to the upper end face of the connecting column. A hinge rod is slidably arranged inside the first mounting cylinder. A rotating column is coaxially rotatably arranged on the end face of the hinge rod near the second mounting cylinder. A sliding member is arranged on the peripheral wall of the rotating column. A sliding groove communicating with both end faces is opened on the inner wall of the second mounting cylinder along its axial direction. The sliding member is adapted to the sliding groove and can slide in the sliding groove. A fixing groove is opened on the end face of the second mounting cylinder away from the first mounting cylinder. The sliding member is adapted to the fixing groove and can be inserted into the fixing groove.

[0008] By adopting the above technical solution, and by setting a sealing slider, a force-bearing plate, a connecting column, a first mounting cylinder, a second mounting cylinder, a hinge rod, a rotating column, and a sliding member, when installing the connecting column, the rotating column and the hinge rod are inserted into the second mounting cylinder, and the sliding member slides in the sliding groove. When the surface of the sliding member away from the first mounting cylinder is flush with the surface of the second mounting cylinder away from the first mounting cylinder, the opposite end faces of the first and second mounting cylinders abut against each other, causing the sliding member to protrude from the second mounting cylinder. By rotating the rotating column, the sliding member is rotated to the fixed groove and inserted into the fixed groove. The connecting column and the sealing slider are hinged, thereby forming a rotatable and detachable connection between the sealing slider and the connecting column. When it is necessary to repair or replace the spring, simply rotate the rotating column to disengage the sliding member from the fixed groove, and the sealing slider and the connecting column can be quickly separated, making it convenient and quick to repair or replace the spring.

[0009] Optionally, the end of the hinge rod away from the rotating column is coaxially fixed with a second annular thickened portion, and a spring is provided between the second thickened portion and the first mounting cylinder, with the two ends of the spring fixed to the surfaces opposite to the first mounting cylinder and the second thickened portion, respectively.

[0010] By adopting the above technical solution, and by setting the second thickened part and the spring, the spring can keep the sliding part always in the fixed groove, reducing the possibility of the hinge column separating from the second mounting cylinder during the relative rotation of the first mounting cylinder and the second mounting cylinder.

[0011] Optionally, the upper end of the connecting column is coaxially fixed with a first thickened part in the shape of an annulus, the lower end of the connecting column passes through the force plate, and a force spring is provided between the first thickened part and the force plate. One end of the force spring is fixed to the surface of the first thickened part, and the other end of the force spring can abut against the surface of the force plate.

[0012] By adopting the above technical solution, and by setting a first thickened part and a force-bearing spring, with one end of the force-bearing spring fixedly connected to the first thickened part and the other end abutting against the force-bearing plate, the elasticity of the force-bearing spring can provide an upward supporting force for the connecting column, allowing the connecting column to slide up and down on the force-bearing plate, thereby driving the sealing slider to always fit against the fan-shaped plate, thus sealing the air preheater. At the same time, the first thickened part can limit the force-bearing spring, ensuring that the force-bearing spring is stably installed between the connecting column and the force-bearing plate.

[0013] Optionally, the load-bearing plate has a connecting hole that connects the two plates, and a connecting post is inserted into the connecting hole. The edge of the connecting post away from the first thickened part is processed into a conical shape.

[0014] By adopting the above technical solution, by processing the edge of the connecting post away from the first thickened part into a conical shape, and inserting the connecting post into the connecting hole, the conical edge can guide the connecting post to quickly align with the connecting hole when it is inserted, reducing the resistance during insertion, facilitating the installation of the connecting post in the load-bearing plate, and improving the installation efficiency of the connecting post and the load-bearing plate.

[0015] Optionally, the end face of the connecting column away from the second thickened part is provided with an installation notch, and a flipping baffle is rotatably provided in the installation notch through the connecting shaft. An annular gasket is provided between the flipping baffle and the force plate, and the gasket is sleeved on the peripheral wall of the connecting column.

[0016] By adopting the above technical solution, and by setting a gasket and a flip-up baffle, the gasket is sleeved on the periphery of the connecting column. After the connecting column penetrates the load-bearing plate, the flip-up baffle can be rotated to make it abut against the gasket, thereby limiting the gasket and preventing it from falling off the connecting column. In this way, the possibility of the connecting column separating from the load-bearing plate is reduced by the gasket, and the stability of the connection between the connecting column and the load-bearing plate is enhanced.

[0017] Optionally, the corners where the sidewall of the flipping baffle intersects with the end face are all chamfered.

[0018] By adopting the above technical solution, and by setting a chamfer at the corner where the side wall and end face of the flipping baffle intersect, the frictional resistance at the corner can be reduced when the flipping baffle is rotated, making the flipping baffle rotate more smoothly, facilitating the operation of the flipping baffle by the staff, and improving the efficiency of installing or removing the gasket.

[0019] Optionally, the sealing slider is made of a self-lubricating alloy.

[0020] By adopting the above technical solution and setting a sealing slider made of self-lubricating alloy, the properties of the self-lubricating alloy can be utilized to reduce the coefficient of friction between the sealing slider and the air preheater sector plate when they slide and fit together, thereby reducing the wear of the sealing slider and increasing its service life. At the same time, the self-lubricating alloy is suitable for high-temperature environments, ensuring that the sealing slider works normally when the air preheater is running at high temperatures.

[0021] Optionally, a U-shaped operating frame is fixedly connected to the end face of the rotating column away from the hinge rod. Both ends of the operating frame are fixedly connected to the end face of the rotating column, and the U-shaped opening of the operating frame faces the rotating column.

[0022] By adopting the above technical solution and setting up an operating frame, a force application point can be provided for the operator, making it convenient for the operator to rotate the rotating column through the operating frame, thereby quickly switching the sliding part between the sliding groove and the fixed groove, realizing the installation or disassembly of the connection structure, and improving the ease of operation when repairing or replacing springs.

[0023] In summary, this application has the following technical effects:

[0024] 1. By setting up a sealing slider, a force-bearing plate, a connecting column, a first mounting cylinder, a second mounting cylinder, a hinge rod, a rotating column, and a sliding member, when installing the connecting column, the rotating column and the hinge rod are inserted into the second mounting cylinder, and the sliding member slides in the sliding groove. When the surface of the sliding member away from the first mounting cylinder is flush with the surface of the second mounting cylinder away from the first mounting cylinder, the opposite end faces of the first and second mounting cylinders abut against each other, causing the sliding member to protrude from the second mounting cylinder. Rotating the rotating column rotates the sliding member to the fixed groove, inserting the sliding member into the fixed groove, and hinges the connecting column and the sealing slider, thereby forming a rotatable and detachable connection between the sealing slider and the connecting column. When it is necessary to repair or replace the spring, simply rotate the rotating column to disengage the sliding member from the fixed groove, and the sealing slider and the connecting column can be quickly separated, making it convenient and quick to repair or replace the spring.

[0025] 2. By setting a first thickened part and a force-bearing spring, one end of the force-bearing spring is fixedly connected to the first thickened part and the other end abuts against the force-bearing plate. The elasticity of the force-bearing spring can provide an upward supporting force for the connecting column, allowing the connecting column to slide up and down on the force-bearing plate, thereby driving the sealing slider to always fit against the sector plate, thus sealing the air preheater. At the same time, the first thickened part can limit the force-bearing spring, ensuring that the force-bearing spring is stably installed between the connecting column and the force-bearing plate.

[0026] 3. By providing a second thickened part and a spring, the spring can keep the sliding part always in the fixed groove, reducing the possibility of the hinge column separating from the second mounting cylinder during the relative rotation of the first mounting cylinder and the second mounting cylinder. Attached Figure Description

[0027] Figure 1 This is a structural diagram of the object of this application;

[0028] Figure 2 This is a structural diagram from another angle after this application is opened.

[0029] Explanation of reference numerals in the attached drawings: 1. Partition plate; 2. Sealing slider; 3. Elastic component; 31. Force plate; 311. Connecting hole; 32. Connecting column; 321. First thickened part; 322. Mounting notch; 33. Gasket; 34. Force spring; 35. Flipping baffle; 36. Connecting shaft; 4. Connecting structure; 41. First mounting cylinder; 42. Second mounting cylinder; 421. Sliding groove; 422. Fixing groove; 43. Hinge rod; 431. Second thickened part; 44. Rotating column; 441. Sliding element; 442. Operating frame. Detailed Implementation

[0030] The present application will be further described in detail below with reference to the accompanying drawings.

[0031] This application discloses a flexible sealing device for an air preheater. The sealing device is installed on the vertical rotor compartment plate 1, combined with... Figure 1 and Figure 2 The sealing device includes a sealing slider 2, an elastic component 3 that provides elasticity to the sealing slider 2, and a connecting structure 4 that connects the elastic component 3 and the sealing slider 2. The sealing slider 2 can dynamically seal the air preheater rotor and the air preheater sector plate, reducing the air leakage rate of the air preheater. The elastic component 3 can provide elasticity to the sealing slider 2, ensuring that the sealing slider 2 is always in contact with the surface of the sector plate during the rotation of the air preheater rotor, thus reducing the air leakage rate. The connecting structure 4 allows the elastic component 3 to be quickly and easily connected to the sealing slider 2, facilitating subsequent inspection, maintenance, or replacement of the elastic component 3 by staff, ensuring the normal operation of the air preheater.

[0032] Combination Figure 1 and Figure 2 The air preheater compartment plate 1 is vertical, and the sealing slider 2 is hinged to the upper end of the compartment plate 1. The sealing slider 2 is a triangular prism made of self-lubricating alloy, which can reduce the coefficient of friction at high temperatures, thereby reducing its own wear and improving its service life. The end face of the sealing slider 2 is a right-angled triangle. The side of the sealing slider 2 away from the right angle is hinged to the upper end of the compartment plate 1 through a pivot. The other side of the sealing slider 2 adjacent to the right angle is located at the top, ensuring that when the sealing slider 2 passes through the sector plate, the sector plate contacts the inclined surface, thereby compressing the sealing slider 2. The side of the sealing slider 2 slides and fits against the lower surface of the sector plate, so that the sealing slider 2 provides an elastic seal to the air preheater.

[0033] Combination Figure 1 and Figure 2The elastic component 3 includes a force-bearing plate 31 horizontally positioned below the sealing slider 2. The force-bearing plate 31 is a metal strip, and its length is parallel to the length of the upper surface of the partition plate 1. The sidewall of the force-bearing plate 31 is fixedly connected to the surface of the partition plate 1. A connecting post 32 is provided between the force-bearing plate 31 and the sealing slider 2. The connecting post 32 is a cylinder and is vertically positioned. Multiple circular connecting holes 311 are spaced apart along the length of the force-bearing plate 31, connecting the two surfaces of the force-bearing plate 31. The lower end of the connecting post 32 passes through the connecting hole 311 and is located below the force-bearing plate 31. The connecting post 32 can slide axially within the connecting hole 311. The connecting holes 311 and the peripheral wall of the connecting post 32 are spaced apart. The upper end face of the connecting post 32 is hinged to the surface of the sealing slider 2 through a connecting structure 4.

[0034] Combination Figure 1 and Figure 2 A first thickened portion 321 in an annular shape is coaxially provided at the end of the connecting column 32 away from the force plate 31. The surface of the first thickened portion 321 facing away from the force plate 31 is flush with the upper end surface of the connecting column 32. A force spring 34 is provided between the first thickened portion 321 and the force plate 31. The force spring 34 is sleeved on the peripheral wall of the connecting column 32. One end of the force spring 34 is fixed to the peripheral wall of the first thickened portion 321, and the other end of the force spring 34 can abut against the upper surface of the force plate 31.

[0035] Combination Figure 1 and Figure 2 The end face of the connecting post 32 away from the first thickened portion 321 is machined into a conical shape. The conical end allows the connecting post 32 to pass through the connecting hole 311 more quickly. A strip-shaped mounting notch 322 is formed inward on the end face of the connecting post 32 away from the first thickened portion 321. The length direction of the mounting notch 322 is parallel to the axis of the connecting post 32. A flipping baffle 35 is rotatably mounted inside the mounting notch 322 via the connecting shaft 36. The flipping baffle 35 is a strip plate made of metal. The flipping baffle 35 is adapted to the mounting notch 322, and the plate surface of the flipping baffle 35 is always parallel to the side wall of the mounting notch 322.

[0036] Combination Figure 1 and Figure 2The connecting shaft 36 is a cylinder. The connecting shaft 36 is far away from the first thickened part 321. The end of the connecting shaft 36 passes through the connecting column 32 and the flipping baffle 35. The axis of the connecting shaft 36 is perpendicular to the plate surface of the flipping baffle 35. The two end faces of the connecting shaft 36 are flush with the surfaces of the connecting column 32 that are opposite to each other. When the lower end of the connecting column 32 is inserted downward into the connecting hole 311, the length direction of the flipping baffle is parallel to the axis of the connecting column 32, and the opposite sidewalls of the flipping baffle 35 are flush with the edge of the sidewall of the mounting notch 322. When the mounting notch 322 is completely below the force plate 31, a ring-shaped gasket 33 is fitted onto the periphery of the connecting column 32. The inner periphery of the gasket 33 is in contact with the outer periphery of the connecting column 32. The gasket 33 is located on the side of the force plate 31 away from the sealing slider 2, and the surface of the gasket 33 can abut against the lower surface of the force plate 31. The gasket 33 is located between the force plate 31 and the mounting notch 322. The flipping baffle 35 is rotated so that the length direction of the flipping baffle 35 is perpendicular to the axis of the connecting column 32. The gasket 33 falls under its own weight, and the surface of the gasket 33 abuts against the sidewall of the flipping baffle 35, fixing the gasket 33. The gasket 33 can reduce the possibility of the connecting column 32 separating from the force plate 31.

[0037] Combination Figure 1 and Figure 2 The four corners where the side wall of the flip-up baffle 35 intersects with the end face are all chamfered, which facilitates the rotation of the flip-up baffle 35.

[0038] Combination Figure 1 and Figure 2 The connecting structure 4 includes a first mounting cylinder 41 and a second mounting cylinder 42. Both the first mounting cylinder 41 and the second mounting cylinder 42 are cylindrical. The outer peripheral wall of the first mounting cylinder 41 is fixed to the surface of the sealing slider 2 opposite to the upper surface of the force plate 31. The outer peripheral wall of the second mounting cylinder 42 is fixed to the upper end face of the connecting column 32. The axes of the first mounting cylinder 41 and the second mounting cylinder 42 are parallel to each other.

[0039] Combination Figure 1 and Figure 2 A hinge rod 43 is slidably disposed inside the first mounting cylinder 41. The hinge rod 43 is a round rod. The peripheral wall of the hinge rod 43 is slidably attached to the inner peripheral wall of the first mounting cylinder 41. A second thickened part 431 in an annular shape is coaxially fixed to the end wall of the hinge rod 43 away from the second mounting cylinder 42. A spring is disposed between the second thickened part 431 and the first mounting cylinder 41. The spring is sleeved on the peripheral wall of the hinge rod 43. The two ends of the spring are fixedly connected to the surfaces of the first mounting cylinder 41 and the second thickened part 431 respectively.

[0040] Combination Figure 1 and Figure 2A rotating column 44 is rotatably mounted on the end face of the hinge rod 43 away from the second thickened portion 431. The rotating column 44 is cylindrical and coaxially mounted with the hinge rod 43, with its peripheral wall flush with that of the hinge rod 43. A rotating shaft (not shown in the figure) is fixedly connected to the end face of the hinge rod 43, and the rotating shaft passes through the rotating column 44, rotatably mounting the rotating column 44 on the end face of the hinge rod 43. A sliding member 441 is fixedly connected to the peripheral wall of the rotating column 44. The sliding member 441 is a block, and its surface away from the first mounting cylinder 41 is flush with the end face of the rotating column 44 away from the first mounting cylinder 41.

[0041] Combination Figure 1 and Figure 2 The inner peripheral wall of the second mounting cylinder 42 is provided with a sliding groove 421 along its axial direction. The sliding groove 421 has openings on both ends of the second mounting cylinder 42. The sliding groove 421 is adapted to the sliding member 441, and the sliding member 441 can be slidably disposed in the sliding groove 421. The end face of the second mounting cylinder 42 opposite to the first mounting cylinder 41 is provided with a fixing groove 422 spaced apart from the sliding groove 421. The fixing groove 422 is adapted to the sliding member 441, and the sliding member 441 can be inserted into the fixing groove 422.

[0042] Combination Figure 1 and Figure 2 When installing the connecting column 32, the rotating column 44 and the hinge rod 43 are inserted into the second mounting cylinder 42, and the sliding member 441 slides in the sliding groove 421. When the surface of the sliding member 441 away from the first mounting cylinder 41 is flush with the surface of the second mounting cylinder 42 away from the first mounting cylinder 41, the opposite end faces of the first mounting cylinder 41 and the second mounting cylinder 42 abut against each other, and the second thickened part 431 is pressed towards the first mounting cylinder 41. The second thickened part 431 compresses the spring, causing the sliding member 441 to protrude from the second mounting cylinder 42. The rotating column 44 is rotated to rotate the sliding member 441 to the fixed groove 422. The second thickened part 431 is released, the spring extends, and the sliding member 441 is inserted into the fixed groove 422, thus hinged the elastic component 3 to the sealing slider 2.

[0043] Combination Figure 1 and Figure 2 An operating frame 442 is fixedly connected to the end face of the rotating column 44 away from the first mounting cylinder 41. The operating frame 442 is U-shaped, and both ends of the operating frame 442 are fixedly connected to the end face of the rotating column 44. The U-shaped opening of the operating frame 442 faces the rotating column 44 and is parallel to the axis of the rotating column 44, so that the operating frame 442 can easily rotate the rotating column 44.

[0044] This specific embodiment is merely an explanation of this application and is not intended to limit it. After reading this specification, those skilled in the art can make modifications to this embodiment without contributing any inventive step, but such modifications are protected by patent law as long as they fall within the scope of the claims of this application.

Claims

1. A flexible sealing device for an air preheater, wherein the sealing device is disposed on the upper part of the compartment plate (1), characterized in that: The system includes a sealing slider (2) hinged to the upper end of the partition plate (1) and a force-bearing plate (31) whose side wall is fixed to the surface of the partition plate (1). The force-bearing plate (31) is horizontally arranged, and a connecting column (32) is vertically arranged between the force-bearing plate (31) and the sealing slider (2). A first mounting cylinder (41) is fixed to the surface of the sealing slider (2) opposite to the force-bearing plate (31), and a second mounting cylinder (42) is fixed to the upper end surface of the connecting column (32). A hinge rod (43) is slidably arranged inside the first mounting cylinder (41), and the hinge rod (43) is close to the second mounting cylinder (41). 2) The end face of the first mounting cylinder (41) is coaxially rotatably provided with a rotating column (44). The rotating column (44) is provided with a sliding member (441) on its peripheral wall. The inner wall of the second mounting cylinder (42) is provided with a sliding groove (421) connecting the two end faces along its axial direction. The sliding member (441) is adapted to the sliding groove (421) and can slide in the sliding groove (421). The end face of the second mounting cylinder (42) opposite to the first mounting cylinder (41) is provided with a fixing groove (422). The sliding member (441) is adapted to the fixing groove (422) and can be inserted into the fixing groove (422).

2. The flexible sealing device for an air preheater according to claim 1, characterized in that: The end of the hinge rod (43) away from the rotating column (44) is coaxially fixed with a second thickened part (431) in the shape of an annulus. A spring is provided between the second thickened part (431) and the first mounting cylinder (41). The two ends of the spring are fixed to the surfaces opposite to the first mounting cylinder (41) and the second thickened part (431), respectively.

3. The flexible sealing device for an air preheater according to claim 1, characterized in that: The upper end of the peripheral wall of the connecting column (32) is coaxially fixed with a first thickened part (321) in the shape of an annulus. The lower end of the connecting column (32) passes through the force plate (31). A force spring (34) is provided between the first thickened part (321) and the force plate (31). One end of the force spring (34) is fixed to the surface of the first thickened part (321), and the other end of the force spring (34) can abut against the upper surface of the force plate (31).

4. The flexible sealing device for an air preheater according to claim 3, characterized in that: The load-bearing plate (31) has a connecting hole (311) on its surface that connects the two surfaces. The connecting post (32) is inserted into the connecting hole (311). The edge of the end face of the connecting post (32) away from the first thickened part (321) is processed into a conical shape.

5. The flexible sealing device for an air preheater according to claim 4, characterized in that: The end face of the connecting column (32) away from the second thickened part (431) is provided with an installation notch (322). The installation notch (322) is rotatably provided with a flipping baffle (35) through the connecting shaft (36). An annular gasket (33) is provided between the flipping baffle (35) and the force plate (31). The gasket (33) is sleeved on the periphery of the connecting column (32).

6. The flexible sealing device for an air preheater according to claim 5, characterized in that: The corners where the sidewall of the flipping baffle (35) intersects with the end face are all chamfered.

7. The flexible sealing device for an air preheater according to claim 1, characterized in that: The sealing slider (2) is made of a self-lubricating alloy.

8. The flexible sealing device for an air preheater according to claim 1, characterized in that: The rotating column (44) is fixedly connected to a U-shaped operating frame (442) on the end face away from the hinge rod (43). Both ends of the operating frame (442) are fixedly connected to the end face of the rotating column (44), and the U-shaped opening of the operating frame (442) faces the rotating column (44).

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