Flexible sealing device for high-capacity boiler air pre-heater

Abstract

The utility model provides a flexible sealing device for a high-capacity boiler air pre-heater, which comprises a rotating assembly fixedly connected to a radial partition plate of the air pre-heater, a sealing plate connected to the upper part of the rotating assembly, and an extension spring connected to the lower end of the sealing plate, the lower end of the extension spring is connected to the lower portion of the rotating assembly through a supporting assembly. According to the flexible sealing device for the large-capacity boiler air pre-heater, the rotating assembly and the extension spring are arranged, so that when the flexible sealing device moves to the position below the sector plate, the sector plate makes contact with and extrudes the rotating assembly, the extension spring is driven to stretch with the extremely small stretching length and the proper tensile force, and the sealing effect is improved; the sealing plate makes contact with the sector plate, the effect that the sealing plate compensates the sealing gap is achieved, and the air leakage rate of the large-capacity boiler air pre-heater is effectively reduced.

Description

Technical Field

[0001] This application relates to the technical field of air preheaters, and particularly to a flexible sealing device for air preheaters of large-capacity boilers. Background Art

[0002] The boiler air preheater is one of the key devices used to improve the boiler efficiency in thermal power plants. Its working principle is to use the hot flue gas discharged from the tail of the coal-fired boiler in the thermal power plant to heat the cold air, and then input the heated cold air into the boiler for combustion support.

[0003] Due to the different temperatures at the hot and cold ends during the operation of the boiler air preheater, the rotor is prone to mushroom-shaped deformation, resulting in an increase in the radial sealing gap between the sector plate and the rotor, causing air leakage problems. Most of the existing technologies use flexible sealing devices to compensate for the radial sealing gap, support the sealing components by compressing springs, and use the stroke of the springs to compress and compensate for the radial sealing gap. However, the compensation effect of this flexible sealing device is limited by the strength and length of the compression springs, and cannot meet the compensation requirements for the relatively large radial sealing gap existing in the air preheaters of large-capacity boilers, resulting in a high air leakage rate in the air preheaters of large-capacity boilers. Summary of the Utility Model

[0004] The purpose of the present utility model is to provide a flexible sealing device for air preheaters of large-capacity boilers, which can effectively reduce the air leakage rate of air preheaters of large-capacity boilers.

[0005] This application is achieved through the following technical solutions, specifically:

[0006] A flexible sealing device for air preheaters of large-capacity boilers includes a rotating component fixedly connected to the radial partition plate of the air preheater, a sealing plate connected to the upper part of the rotating component, and a tension spring connected to the lower end of the sealing plate. The lower end of the tension spring is connected to the lower part of the rotating component through a support component.

[0007] In this solution, by setting the rotating component and the tension spring, when the flexible sealing device moves below the sector plate, the sector plate contacts and presses the rotating component, driving the tension spring to elongate with a very small elongation length and an appropriate tensile force, so that the sealing plate contacts the sector plate, achieving the effect of compensating the sealing gap by the sealing plate and effectively reducing the air leakage rate of the air preheater of the large-capacity boiler.

[0008] As an improvement of this application to the rotating component, the rotating component includes: a first support plate fixedly connected to the radial partition plate and a rotating shaft connected to the upper part of the first support plate, and the rotating shaft is connected to the lower part of the sealing plate.

[0009] As an improvement of the present application to the support assembly, the support assembly includes: a limiting mechanism fixedly connected to one side of the first support plate, and the limiting mechanism abuts against the lower part of the sealing plate.

[0010] Further, on the basis of the above improvement, the support assembly further includes: a second support plate connected to the lower end of the tension spring, and the second support plate is fixedly connected to the first support plate.

[0011] As an improvement of the present application to the limiting mechanism, the limiting mechanism includes: a first limiting plate abutting against the lower part of the sealing plate and a diversion plate connected to the first limiting plate, and the diversion plate is arranged below the rotating shaft.

[0012] As an improvement of the present application solution, the flexible sealing device further includes: a first support half shaft arranged at the upper end of the tension spring and a second support half shaft arranged at the lower end of the tension spring; the tension spring is connected to the lower end of the sealing plate through the first support half shaft, and the tension spring is connected to the support assembly through the second support half shaft.

[0013] As an improvement of the present application solution, the flexible sealing device further includes: a slider fixedly connected to the upper end of the sealing plate.

[0014] The beneficial effects of the present application are as follows:

[0015] 1. In the solution of the present application, by setting the rotating assembly and the tension spring, when the flexible sealing device moves below the sector plate, the sector plate contacts and presses the rotating assembly, driving the tension spring to elongate with a very small elongation length and an appropriate pulling force, so that the sealing plate contacts the sector plate, achieving the effect of compensating the sealing gap by the sealing plate, and effectively reducing the air leakage rate of the air preheater of the large-capacity boiler.

[0016] 2. The solution of the present application can adjust the action range of the flexible sealing device by adjusting the position of the rotating assembly and the length of the sealing plate, so as to compensate the radial sealing gap of the air preheater of any size, and has good flexibility and practicability.

[0017] In addition to the technical problems solved by the present invention, the technical features constituting the technical solution, and the advantages brought by these technical features of the technical solution described above, other technical problems that the present invention can solve, other technical features included in the technical solution, and the advantages brought by these technical features will be further described in detail in conjunction with the drawings. Description of the Drawings

[0018] Figure 1 It is a schematic structural diagram of a flexible sealing device for an air preheater of a large-capacity boiler in an embodiment of the present application.

[0019] Description of reference numerals:

[0020] 1. Rotating assembly; 11. First support plate; 12. Rotating shaft;

[0021] 2. Sealing plate;

[0022] 3. Tensile spring; 31. First support half shaft; 32. Second support half shaft;

[0023] 4. Support assembly; 41. Limiting mechanism; 42. Second support plate;

[0024] 5. Slide block. Detailed implementation manners

[0025] Next, embodiments of the technical solution of the present application will be described in detail. The following embodiments are only used to more clearly illustrate the technical solution of the present application, so they are only examples and cannot be used to limit the protection scope of the present application. In addition, the technical features involved in the various embodiments of the present utility model described below can be combined with each other as long as they do not conflict with each other. Figure 1

[0026] In view of the problems existing in the prior art in the background art, the embodiment of the present application provides a flexible sealing device for a large-capacity boiler air preheater. As shown in the structural schematic diagram, the flexible sealing device includes: a rotating assembly 1 fixedly connected to the radial partition plate of the air preheater, a sealing plate 2 connected to the upper part of the rotating assembly 1, and a tensile spring 3 connected to the lower end of the sealing plate 2. The lower end of the tensile spring 3 is connected to the lower part of the rotating assembly 1 through a support assembly 4. Figure 1

[0027] Specifically, the prior art uses a compression spring to support a sealing component such as a sealing plate, and compensates for the radial sealing gap of the air preheater by compressing the stroke of the compression spring. However, the compensation distance of the flexible sealing device for the sealing component is limited by the strength and length of the compression spring, resulting in that the compensation distance of the existing flexible sealing device is difficult to exceed 30 mm. To solve the problem of the too small compensation distance of the existing flexible sealing device, the present application creatively adopts the design idea of combining the tensile spring 3 with the rotating assembly 1. Combining the lever principle, the force applied to the sealing plate 2 by the sector plate is converted into a tensile force applied to the tensile spring 3 through the rotating assembly 1, so as to use the tensile spring 3 to apply a reverse force to the sealing plate 2. In this embodiment, the position of the rotating assembly 1 and the length of the sealing plate 2 can also be adjusted so that the flexible sealing component structure is adjusted to a suitable state, that is, the tensile spring can achieve the purpose of compensating the radial sealing gap of the sealing plate 2 with a very small tensile length and an appropriate tensile force.

[0028] ​​Optionally, the lower end of the sealing plate 2 can be set to be bent, so as to reduce the difficulty of connecting with the tension spring 3.

[0029] Optionally, in order to reduce the wear of the sector plate caused by the contact between the sealing plate 2 and the sector plate, a material with a lower hardness and friction coefficient can be selected to make the sealing plate 2, or by increasing the thickness of the sealing plate 2, the wearable amount of the sealing plate 2 can be increased to extend the service life of the sealing plate 2.

[0030] Continue to refer to Figure 1 , in order to reduce the wear of the sector plate caused by the contact between the sealing plate 2 and the sector plate, in one implementation, the flexible sealing device further includes: a slider 5 fixedly connected to the upper end of the sealing plate 2. Specifically, the slider 5 can be made of a material with a relatively small friction coefficient, so as to reduce the wear of the sealing plate 2 on the bottom of the sector plate.

[0031] It can be seen that in this embodiment, by setting the rotating assembly and the tension spring, when the flexible sealing device moves to the lower part of the sector plate, the sector plate contacts and presses the rotating assembly, driving the tension spring to elongate with a very small elongation length and an appropriate pulling force, so that the sealing plate contacts the sector plate, achieving the effect of compensating the sealing gap by the sealing plate, and effectively reducing the air leakage rate of the air preheater of the large-capacity boiler. And in this embodiment, the action range of the flexible sealing device can be adjusted by adjusting the position of the rotating assembly and the length of the sealing plate, so as to compensate the radial sealing gap of the air preheater of any size, which has good flexibility and practicability.

[0032] In one implementation, the rotating assembly 1 includes: a first support plate 11 fixedly connected to the radial partition plate and a rotating shaft 12 connected to the upper part of the first support plate 11, and the rotating shaft 12 is connected to the lower part of the sealing plate 2.

[0033] Specifically, the first support plate 11 is fixedly arranged on the radial partition plate in the vertical direction, providing a basic support for the sealing plate 2 to rotate around the rotating shaft 12. In this embodiment, the lower part of the sealing plate 2 is connected to the rotating shaft 12. This connection method allows the sealing plate 2 to rotate and displace around the rotating shaft 12 when subjected to the elastic force of the tension spring 3, so as to adjust the distance between the upper part of the sealing plate 2 and the sector plate and realize the compensation of the sealing gap.

[0034] In one implementation, the support assembly 4 includes: a limiting mechanism 41 fixedly connected to one side of the first support plate 11, and the limiting mechanism 41 abuts against the lower part of the sealing plate 2.

[0035] Specifically, the limiting mechanism 41 can be divided into a bent section and a straight rod section. The straight rod section of the limiting mechanism 41 is fixedly connected to one side of the first support plate 11, and the bent section of the limiting mechanism 41 abuts against the lower part of the sealing plate 2 to limit the sealing plate 2 and ensure that the rotation angle of the sealing plate 2 is controlled within a certain range. The bent section can also protect the tension spring 3 to prevent the acting force of the sealing plate 2 rotating around the rotating shaft 12 from indirectly acting on the tension spring 3 and shortening the service life of the tension spring 3.

[0036] Furthermore, in this embodiment, the initial tensile amount of the tension spring 3 can also be adjusted by adjusting the position of the limiting mechanism 41, so as to achieve the purpose of controlling the maximum compensation amount of the flexible sealing device of the present application.

[0037] Furthermore, the bent section of the limiting mechanism 41 can play a guiding role in the flue gas blown into the lower part of the air preheater of the large-capacity boiler, preventing the flue gas from overheating and damaging the rotating shaft 12 and extending the service life of the flexible sealing device.

[0038] On the basis of the previous embodiment, in order to improve the flexibility and practicability of the limiting mechanism 41, in one implementation manner, the limiting mechanism 41 includes: a first limiting plate abutting against the lower part of the sealing plate 2 and a guiding plate connected to the first limiting plate, and the guiding plate is arranged below the rotating shaft 12.

[0039] Specifically, in this embodiment, the limiting mechanism 41 is split into a first limiting plate and a guiding plate. The first limiting plate is used to limit the sealing plate 2; the guiding plate is used to guide the flue gas blown into the lower part of the air preheater of the large-capacity boiler, achieving the effect of protecting the rotating shaft 12. Optionally, the first limiting plate and the guiding plate can be connected or separated in a variety of connection methods according to actual needs, and the present application does not limit this.

[0040] Optionally, the limiting mechanism 41 can also include a plurality of components such as a spring protection plate for preventing the acting force of the sealing plate 2 rotating around the rotating shaft 12 from directly acting on the tension spring 3 and damaging the tension spring 3.

[0041] In this embodiment, the limiting mechanism 41 is split into a plurality of components including a first limiting plate and a guiding plate, improving the modularity of the flexible sealing device. When a fault occurs in the flexible sealing device, the specific problem component can be located more quickly and replaced or repaired, reducing the maintenance time and downtime of the flexible sealing device.

[0042] In one implementation manner, the support assembly 4 further includes: a second support plate 42 connected to the lower end of the tension spring 3, and the second support plate 42 is fixedly connected to the first support plate 11. Specifically, the second support plate 42 is fixedly connected to one side of the first support plate 11 and is used to support the tension spring 3.

[0043] In one implementation, the flexible sealing device further includes: a first supporting half shaft 31 disposed at the upper end of the tension spring 3 and a second supporting half shaft 32 disposed at the lower end of the tension spring 3; the tension spring 3 is connected to the lower end of the sealing plate 2 through the first supporting half shaft 31, and the tension spring 3 is connected to the support assembly 4 through the second supporting half shaft 32.

[0044] Specifically, in order to ensure that the tension spring 3 can be stably and effectively connected to the sealing plate 2 and the support assembly 4, the first supporting half shaft 31 and the second supporting half shaft 32 are provided in this embodiment. The setting of the first supporting half shaft 31 enables the bent portion at the lower end of the sealing plate 2 to be firmly embedded or fixed at the top of the tension spring 3, so that when the tension spring 3 is subjected to an external force, it can drive the sealing plate 2 to perform corresponding displacement adjustment. The second supporting half shaft 32 is fixedly connected to the upper end surface of the second support plate 42 provided in the previous embodiment.

[0045] Optionally, the first supporting half shaft 31 and the second supporting half shaft 32 can be connected to the sealing plate 2 and the support assembly 4 at the upper and lower ends of the tension spring 3 respectively by adopting other structural methods according to actual use needs, and the present application does not impose any restrictions on the connection method.

[0046] In the description of the embodiments of the present application, unless otherwise clearly specified and limited, technical terms such as "set", "provided with", "connected", "installed" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or integrated; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium. For those of ordinary skill in the art, the specific meanings of the above terms in the embodiments of the present application can be understood according to specific circumstances.

[0047] Finally, it should be noted that: the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that: they can still modify the technical solutions recorded in the foregoing embodiments, or perform equivalent replacements on some or all of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A flexible sealing device for a large-capacity boiler air preheater, characterized in that: include: A rotating assembly (1) fixedly connected to a radial partition plate of an air preheater, a sealing plate (2) connected to the upper part of the rotating assembly (1), and a tension spring (3) connected to the lower end of the sealing plate (2), wherein the lower end of the tension spring (3) is connected to the lower part of the rotating assembly (1) via a supporting assembly (4).

2. The flexible sealing device according to claim 1, characterized in that: The rotating assembly (1) comprises: a first support plate (11) fixedly connected to the radial partition plate and a rotating shaft (12) connected to the upper part of the first support plate (11), and the rotating shaft (12) is connected to the lower part of the sealing plate (2).

3. The flexible sealing device according to claim 2, characterized in that: The support assembly (4) comprises: a limiting mechanism (41) fixedly connected to one side of the first support plate (11), the limiting mechanism (41) abutting against the lower part of the sealing plate (2).

4. The flexible sealing device according to claim 3, characterized in that: The support assembly (4) further comprises: a second support plate (42) connected to the lower end of the tension spring (3), and the second support plate (42) is fixedly connected to the first support plate (11).

5. The flexible sealing device according to claim 3, characterized in that: The limiting mechanism (41) comprises: a first limiting plate abutting against the lower part of the sealing plate (2) and a guide plate connected to the first limiting plate, wherein the guide plate is arranged below the rotating shaft (12).

6. The flexible sealing device according to claim 1, characterized in that: The flexible sealing device further comprises: a first supporting half shaft (31) arranged at the upper end of the tension spring (3) and a second supporting half shaft (32) arranged at the lower end of the tension spring (3); The tension spring (3) is connected to the lower end of the sealing plate (2) via the first support half shaft (31), and the tension spring (3) is connected to the support assembly (4) via the second support half shaft (32).

7. The flexible sealing device according to claim 1, characterized in that: The flexible sealing device further comprises a sliding block (5) fixedly connected to the upper end of the sealing plate (2).

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