Novel elastic sealing device of air pre-heater

Abstract

The utility model discloses a novel elastic sealing device of an air pre-heater, which belongs to the technical field of air pre-heater sealing and comprises a movable sealing plate and a fixed plate, a movable hinge and two elastic sealing components are respectively mounted on one side of the movable sealing plate adjacent to the fixed plate, and the two elastic sealing components are symmetrically arranged. According to the utility model, the self-lubricating alloy coating is arranged on the movable sealing plate, so that the friction between the movable sealing plate and the fan-shaped plate is reduced, and unsafe factors such as large running current fluctuation caused by large friction force of the elastic sealing are avoided, so that the service life of the fan-shaped plate is prolonged, the service life of the fan-shaped plate is prolonged, and the service life of the fan-shaped plate is prolonged. The air pre-heater is simple in structure and convenient to use, the trouble that an air pre-heater sealing piece and a sector plate need to be frequently replaced due to large abrasion is effectively avoided, in order to avoid air leakage gaps caused by mushroom-shaped deformation of the air pre-heater, radial sealing is designed to have an elastic compensation function, and therefore the overall air leakage rate of the air pre-heater is reduced.

Description

Technical Field

[0001] This utility model relates to the field of air preheater sealing technology, specifically a novel elastic sealing device for air preheaters. Background Technology

[0002] Currently, air preheaters are a type of heat exchange equipment used in large boilers. Their air leakage rate directly affects boiler efficiency. The air leakage rate of air preheaters is an important indicator affecting boiler efficiency. The lower the air leakage rate of air preheaters, the higher the boiler efficiency.

[0003] Traditional air preheater units use rigid sealing plates in the radial direction. Especially when the air preheater is running hot, the rotor will deform into a "mushroom shape" due to the temperature difference between the hot and cold ends exceeding 200°C. This results in a large air leakage area on the outside of the hot end, with a leakage rate generally above 8%. Moreover, after a few years of operation, the leakage rate of most units can reach more than 10%. At the same time, after the traditional rigid seal is used at the cold end of the air preheater, the sector plate will wear out significantly, requiring replacement of the sector plate every one to two years. In addition, the current of the drive motor will increase by about 3A-5A, which will increase the plant's power consumption and shorten the product life. Especially after the denitrification retrofit, the cold end of the unit is more corrosive, and many products cannot withstand the low-temperature condensation corrosion, further shortening the product life. Therefore, a new type of elastic sealing device for air preheaters is proposed. Summary of the Invention

[0004] The purpose of this invention is to provide a novel elastic sealing device for an air preheater to solve the problems mentioned in the background art.

[0005] To achieve the above objectives, the present invention provides the following technical solution: a novel elastic sealing device for an air preheater, comprising a movable sealing plate and a fixed plate, wherein a movable hinge and two elastic sealing components are respectively installed on the adjacent side of the movable sealing plate and the fixed plate, the two elastic sealing components are symmetrically arranged, and both elastic sealing components are located on the side of the movable hinge away from the movable sealing plate;

[0006] The movable hinge includes a pivot sleeve, and a wear-resistant bushing and a pivot are sequentially installed inside the pivot sleeve;

[0007] The rotating bushing includes at least three tubes, and the wear-resistant bushing is made of metal ceramic.

[0008] As a further preferred embodiment of this technical solution: the movable hinge enables the movable sealing plate to rotate, and the elastic sealing component absorbs energy and buffers it by means of the elastic deformation of the compression spring when the movable sealing plate rotates, and facilitates the reset of the movable sealing plate after rotation. At this time, the wear-resistant bushing has strong corrosion resistance and wear resistance, and makes the movable hinge more flexible and wear-resistant.

[0009] As a further preferred embodiment of this technical solution: the movable sealing plate is provided with a sealing arc surface, the fixed plate is provided with an extension section, and the side of the extension section away from the fixed plate is provided with a receiving arc surface. The top of the sealing arc surface receives the self-lubricating alloy coating, the bottom receives the upper spring seat, and the movable hinge is received inside the receiving arc surface, while the support seat is received outside.

[0010] The movable hinge is located within the receiving arc surface, and one of the tubes is connected to the movable sealing plate, while the other two tubes are connected to the fixed plate. This arrangement enables the movable sealing plate to rotate.

[0011] As a further preferred embodiment of this technical solution: the elastic sealing assembly includes two support seats, each of which is equipped with a lower spring seat, and two upper spring seats are symmetrically fixedly connected within the sealing arc surface. The lower spring seats are supported by the support seats, and the compression springs are supported by each spring seat.

[0012] The two support seats are symmetrically installed on the extension section and the receiving arc surface.

[0013] As a further preferred embodiment of this technical solution: a compression spring and a screw are respectively installed on the adjacent side of the lower spring seat and the upper spring seat. The screw is located inside the compression spring. By squeezing the compression spring, the movable sealing plate is elastically rotated up and down around the movable hinge as the axis. The screw prevents offset when squeezing the compression spring, and the screw is adjusted by using an adjusting nut.

[0014] As a further preferred embodiment of this technical solution: one end of the screw is fixedly connected to the upper spring seat, and the other end of the screw passes through the lower spring seat and the support seat in sequence. The above arrangement realizes the support of the elastic sealing component and facilitates the subsequent adjustment of the elastic sealing component by the screw.

[0015] As a further preferred embodiment of this technical solution: an adjusting nut is installed on the extension section of the screw that passes through the support base. By tightening or loosening the adjusting nut, the angle of the elastic sealing component can be precisely controlled and positioned.

[0016] As a further preferred embodiment of this technical solution: two mounting holes are symmetrically provided on the fixing plate, and the fixing plate with mounting holes is fixed to the rotor radial partition plate.

[0017] As a further preferred embodiment of this technical solution: the sealing arc surface is provided with a self-lubricating alloy coating, and the material for making the self-lubricating alloy coating is molybdenum disulfide grease. The self-lubricating alloy coating makes the movable sealing plate move more flexibly, thereby effectively avoiding wear between the movable sealing plate and the air preheater sector plate.

[0018] Compared with the prior art, the beneficial effects of this utility model are:

[0019] This invention uses corrosion-resistant stainless steel, which greatly improves the sealing components' ability to withstand the corrosion of sulfuric acid at the cold end of the air preheater. Simultaneously, a self-lubricating alloy coating is applied to the movable sealing plate, reducing friction with the sector plate. This avoids safety risks such as large fluctuations in operating current caused by high friction in elastic seals, and effectively avoids the hassle of frequent replacement of air preheater seals and sector plates due to wear. To prevent air leakage gaps caused by the "mushroom-shaped" deformation of the air preheater, the radial seal is designed with elastic compensation, thereby reducing the overall air leakage rate of the air preheater. The entire device is wear-resistant and corrosion-resistant for a long time, allowing the entire sealing unit to remain intact throughout a major overhaul cycle, further reducing the air leakage rate and achieving high efficiency, energy saving, and emission reduction. Attached Figure Description

[0020] Figure 1 This is a first structural schematic diagram of a novel elastic sealing device for an air preheater according to the present invention;

[0021] Figure 2 This is a second structural schematic diagram of a novel elastic sealing device for an air preheater according to the present invention;

[0022] Figure 3 This is a side view of the structure of a novel elastic sealing device for an air preheater according to the present invention.

[0023] In the diagram: 1. Movable sealing plate; 101. Sealing arc surface; 2. Fixing plate; 21. Extension section; 22. Receiving arc surface; 23. Mounting hole; 3. Support seat; 4. Lower spring seat; 5. Upper spring seat; 6. Compression spring; 7. Screw; 8. Adjusting nut; 9. Rotary shaft sleeve; 10. Wear-resistant bushing; 11. Rotary shaft; 12. Self-lubricating alloy coating. Detailed Implementation

[0024] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention.

[0025] Example 1

[0026] Please see Figures 1-3 This utility model provides a technical solution: a novel elastic sealing device for an air preheater, comprising a movable sealing plate 1 and a fixed plate 2. Movable hinges and two elastic sealing components are respectively installed on the adjacent side of the movable sealing plate 1 and the fixed plate 2. The two elastic sealing components are symmetrically arranged, and both elastic sealing components are located on the side of the movable hinge away from the movable sealing plate 1.

[0027] The hinge includes a pivot sleeve 9, inside which a wear-resistant bushing 10 and a pivot 11 are installed in sequence;

[0028] Among them, the rotating bushing 9 includes at least three tubes, and the wear-resistant bushing 10 is made of metal ceramic.

[0029] In this embodiment, specifically: the rotation effect of the movable sealing plate 1 is achieved by setting a movable hinge, and the elastic sealing component is used to absorb energy and buffer when the movable sealing plate 1 rotates by the elastic deformation of the compression spring 6, and is used for the reset work after the movable sealing plate 1 rotates. The wear-resistant bushing 10 has strong corrosion resistance and wear resistance, and makes the movable hinge more flexible and wear-resistant, thereby effectively improving its service life.

[0030] The elastic sealing component is 400mm-500mm long, and apart from the components disclosed in the materials, all other components are made of stainless steel.

[0031] In this embodiment, specifically: the movable sealing plate 1 is provided with a sealing arc surface 101, the fixed plate 2 is provided with an extension section 21, and the side of the extension section 21 away from the fixed plate 2 is provided with a receiving arc surface 22. The top of the sealing arc surface 101 is used to receive the self-lubricating alloy coating 12, and the bottom is used to receive the upper spring seat 5. The inside of the receiving arc surface 22 is used to receive the movable hinge, and the outside is used to receive the support seat 3.

[0032] The movable hinge is located within the receiving arc surface 22, and one tube is connected to the movable sealing plate 1, while the other two tubes are connected to the fixed plate 2. The above arrangement enables the movable sealing plate 1 to rotate.

[0033] In this embodiment, specifically: a self-lubricating alloy coating 12 is provided on the sealing arc surface 101. The self-lubricating alloy coating 12 is made of molybdenum disulfide grease. The self-lubricating alloy coating 12 makes the movable sealing plate 1 move more flexibly, thereby effectively avoiding wear between the movable sealing plate 1 and the air preheater sector plate.

[0034] Example 2

[0035] A novel elastic sealing device for an air preheater includes two support seats 3, each of which is equipped with a lower spring seat 4. Two upper spring seats 5 are symmetrically welded within the sealing arc surface 101. The support seats 3 are used to support the lower spring seats 4, while the spring seats are used to support the compression springs 6.

[0036] Two support bases 3 are symmetrically installed on the extension section 21 and the receiving arc surface 22.

[0037] In this embodiment, specifically: a compression spring 6 and a screw 7 are respectively installed on the adjacent side of the lower spring seat 4 and the upper spring seat 5. The screw 7 is located inside the compression spring 6. By squeezing the compression spring 6, the movable sealing plate 1 is elastically rotated up and down around the movable hinge as the axis. The screw 7 is provided to prevent displacement when squeezing the compression spring 6, and the screw 7 is adjusted by the adjusting nut 8.

[0038] In this embodiment, specifically: one end of the screw 7 is welded to the upper spring seat 5, and the other end of the screw 7 passes through the lower spring seat 4 and the support seat 3 in sequence. Through the above arrangement, on the one hand, the elastic sealing component is supported, and on the other hand, it is convenient to adjust the elastic sealing component through the screw 7.

[0039] In this embodiment, specifically: an adjusting nut 8 is installed on the extension section of the screw 7 through the support base 3. The adjusting nut 8 can achieve precise control and positioning of the angle of the elastic sealing component by tightening or loosening the adjusting screw 7.

[0040] In this embodiment, specifically: two mounting holes 23 are symmetrically opened on the fixing plate 2, and the mounting holes 23 facilitate fixing the fixing plate 2 to the rotor radial partition plate.

[0041] Working principle: During use, the elastic sealing components are arranged in sequence, and the fixing plate 2 is fixed to the rotor radial partition plate with fixing bolts through the opening mounting holes 23. When cold, the sealing arc surface 101 on the movable sealing plate 1 is higher than the sealing surface of the sector plate. During cold operation, the movable sealing plate 1 is elastically compressed into the sector plate, thus maintaining interference contact with the sealing surface of the sector plate. When hot, the rotor undergoes "mushroom-shaped" deformation due to the large temperature difference between the cold and hot ends. At this time, the elastic sealing components installed on the radial partition plate keep the movable sealing plate 1 tightly attached to the sector plate under the action of elastic force, thereby filling the air leakage gap caused by the "mushroom-shaped" deformation, effectively reducing the air leakage rate of the air preheater. In addition, the sealing arc surface 101 of the movable sealing plate 1 is provided with a self-lubricating alloy coating 12, which greatly reduces the coefficient of friction and effectively avoids wear between the movable sealing plate 1 and the sector plate of the air preheater.

[0042] Although embodiments of the present 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 present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A novel elastic sealing device for an air preheater, comprising a movable sealing plate (1) and a fixed plate (2), characterized in that: The movable sealing plate (1) and the fixed plate (2) are respectively equipped with a movable hinge and two elastic sealing components on the adjacent side. The two elastic sealing components are symmetrically arranged, and both elastic sealing components are located on the side of the movable hinge away from the movable sealing plate (1). The movable hinge includes a pivot sleeve (9), and a wear-resistant bushing (10) and a pivot (11) are installed in sequence inside the pivot sleeve (9); The rotating bushing (9) includes at least three tubes, and the wear-resistant bushing (10) is made of metal ceramic.

2. The novel elastic sealing device for an air preheater according to claim 1, characterized in that: The movable sealing plate (1) is provided with a sealing arc surface (101), the fixed plate (2) is provided with an extension section (21), and the extension section (21) is provided with a receiving arc surface (22) on the side away from the fixed plate (2); The movable hinge is located within the receiving arc surface (22), and one of the tubes is connected to the movable sealing plate (1), while the other two tubes are connected to the fixed plate (2).

3. A novel elastic sealing device for an air preheater according to claim 2, characterized in that: The elastic sealing assembly includes two support seats (3), each of which is equipped with a lower spring seat (4), and two upper spring seats (5) are symmetrically fixedly connected within the sealing arc surface (101). The two support seats (3) are symmetrically installed on the extension section (21) and the receiving arc surface (22).

4. A novel elastic sealing device for an air preheater according to claim 3, characterized in that: A compression spring (6) and a screw (7) are respectively installed on the adjacent side of the lower spring seat (4) and the upper spring seat (5), and the screw (7) is located inside the compression spring (6).

5. A novel elastic sealing device for an air preheater according to claim 4, characterized in that: One end of the screw (7) is fixedly connected to the upper spring seat (5), and the other end of the screw (7) passes through the lower spring seat (4) and the support seat (3) in sequence.

6. A novel elastic sealing device for an air preheater according to claim 5, characterized in that: The screw (7) is installed with an adjusting nut (8) on the extension section of the support base (3).

7. A novel elastic sealing device for an air preheater according to claim 1, characterized in that: Two mounting holes (23) are symmetrically provided on the fixing plate (2).

8. A novel elastic sealing device for an air preheater according to claim 2, characterized in that: The sealing arc surface (101) is provided with a self-lubricating alloy coating (12), and the self-lubricating alloy coating (12) is made of molybdenum disulfide grease.

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