Air pre-heater hot end radial sealing assembly and air pre-heater

Abstract

The utility model discloses an air pre-heater hot end radial sealing assembly and an air pre-heater, and relates to the technical field of air pre-heater sealing assemblys.The sealing assembly comprises an installation base, a second sealing plate installed on the installation base through a bimetallic strip, an adjusting base and a spring plate, the lower end of the spring plate is fixedly connected with the installation base, and the adjusting base is fixedly connected with the second sealing plate. The adjusting seat is connected with the upper end of the spring plate, one end of the bimetallic strip is fixedly connected with the adjusting seat, the other end of the bimetallic strip is fixedly connected with the lower end of the second sealing plate, and the connecting position of the adjusting seat in the height direction of the spring plate is adjustable. The air pre-heater comprises the sealing assembly. By the adoption of the sealing assembly, the installation position of the sealing assembly in the radial direction of the air pre-heater rotor can be well matched, and meanwhile the service life of the sealing assembly is guaranteed.

Description

Technical Field

[0001] This utility model relates to the technical field of air preheater sealing components, and in particular to an air preheater hot-end radial sealing component and an air preheater. Background Technology

[0002] The air preheater (hereinafter referred to as the air preheater) is an important component of the boiler. Its function is to use the heat of the flue gas at the tail end of the boiler to heat the air entering the boiler, thereby improving boiler efficiency. During operation, uneven heating of the rotor can cause mushroom-shaped deformation, which leads to changes in the radial sealing gap. This, in turn, affects the sealing performance of the air preheater, resulting in increased air leakage and reduced boiler efficiency.

[0003] Traditional radial sealing structures at the hot end of air preheaters typically employ a single-layer metal sheet, which has limited ability to compensate for rotor deformation and is insufficient to meet the sealing performance requirements of large air preheaters. In recent years, with advancements in materials technology and innovations in sealing structure design, new sealing structures have continuously emerged to address air leakage during air preheater operation, leading to a continuous reduction in air leakage. Currently, the leakage rate of newly commissioned units in China has generally decreased to around 6%, with some units even reaching internationally leading levels of 2-4%.

[0004] In existing common sealing structures, to achieve dynamic compensation of the sealing amount in response to changes in rotor deformation, and considering the lifespan of the sealing strip, the most common sealing structure designs are elastic plate type and bimetallic plate type. Regarding the bimetallic plate type sealing structure, the applicant previously filed a technical solution with patent application number CN201510228405.5. In this solution, by using a specific type of bimetallic plate, not only can a large sealing compensation amount be obtained when the rotor deforms, but also, from the perspective of bimetallic plate fatigue, this type of sealing structure has the characteristics of fatigue resistance and long service life because the stress level on the bimetallic plate is relatively small.

[0005] The radial sealing assembly at the hot end of the air preheater is usually arranged continuously along the radial direction of the rotor at the upper end of the air preheater rotor. In order to further improve its service life and adaptability, it is necessary to further improve the relevant technology. Utility Model Content

[0006] To address the aforementioned technical problem of improving the radial sealing assembly at the hot end of the air preheater, this invention provides a radial sealing assembly at the hot end of the air preheater and an air preheater. The sealing assembly proposed in this solution not only better adapts to the installation position of the sealing assembly in the radial direction of the air preheater rotor, but also helps ensure the service life of the sealing assembly.

[0007] To address the aforementioned problems, this utility model provides an air preheater hot-end radial sealing assembly and an air preheater that solve the problems through the following technical points: An air preheater hot-end radial sealing assembly includes a mounting base, a second sealing plate mounted on the mounting base via a bimetallic strip, an adjusting base, and a spring plate. The lower end of the spring plate is fixedly connected to the mounting base, the adjusting base is connected to the upper end of the spring plate, one end of the bimetallic strip is fixedly connected to the adjusting base, and the other end of the bimetallic strip is fixedly connected to the lower end of the second sealing plate. The connection position of the adjusting base in the height direction of the spring plate is adjustable.

[0008] During operation, the rotor of an air preheater exhibits significantly different shapes in cold and hot states. This causes problems such as: the rotor undergoing mushroom-shaped deformation due to heat, leading to an increased gap between the hot end of the rotor and the upper sector plate. This allows high-temperature flue gas from the hot end to leak radially into the low-temperature air from the cold end, resulting in reduced thermal efficiency. The radial sealing assembly provided in this solution, when applied to the air preheater, is mounted on the hot end (upper end) of the rotor via a mounting bracket. The bimetallic strip deforms due to heat, causing the second sealing plate to move upwards relative to the rotor, thus reducing the gap between it and the sector plate, or maintaining the upper end of the second sealing plate in contact with the sector plate. This reduces radial leakage of fluid at the hot end of the air preheater and ensures its thermal efficiency.

[0009] This solution addresses the problem that after the air preheater rotor undergoes mushroom-shaped deformation, different radial positions at the hot end have different deformation amounts compared to the cold state, thus requiring sealing assemblies installed at different radial positions to have different sealing plate position compensation amounts. It provides a technical solution that not only better adapts the installation position of the sealing assembly in the radial direction of the air preheater rotor, but also benefits the service life of the sealing assembly.

[0010] In this design, an adjustable seat with an adjustable connection position in the height direction of the spring plate is included, and the second sealing plate is connected to the spring plate via a bimetallic strip. Thus, for sealing assemblies installed at different radial positions on the rotor, the installation height of the adjusting seat on the spring plate is adjusted, allowing the bimetallic strip to have an adjustable installation height on the rotor. For example, after the bimetallic strip undergoes thermal deformation, the second sealing plate can be supported at different heights by adjusting the installation height, thereby controlling the gap between the second sealing plate and its upper sector plate. This allows adjustment of the contact force between the second sealing plate and its upper sector plate. Therefore, when this radial sealing assembly is installed at different radial positions on the rotor, the... The installation height of the bimetallic strip fixed end relative to the rotor can be adjusted according to the actual installation position of the sealing assembly in the radial direction of the rotor, thereby achieving the purpose of adapting to a suitable gap size or contact force. This allows the solution to better adapt to the installation position of the sealing assembly in the radial direction of the air preheater rotor. Regarding the application of the second sealing plate in contact with the sector plate under the action of the hot bimetallic strip, since the contact force is adjustable, considering the wear rate affected by the magnitude of the contact force between the second sealing plate and the sector plate, and the fatigue effect of the stress level on the bimetallic strip, this solution can ensure the service life of the sealing assembly by adjusting the mounting base to have a suitable installation height on the spring plate.

[0011] On the other hand, the second sealing plate, as the uppermost part of the hot-end radial sealing assembly, is used to contact the sector plate or form the gap. When the second sealing plate contacts the sector plate under the action of the hot bimetallic strip and the spring plate is located behind the upper end of the second sealing plate, the spring plate will be subjected to a thrust toward its rear. Under this thrust, the upper end of the spring plate will shift backward, and its elastic properties will be attenuated to a certain extent under the influence of heat. Unlike setting the mounting base as an elastic structure, the spring plate is more likely to deform under the contact force between the second sealing plate and the sector plate, thus effectively reducing the contact force between the second sealing plate and the sector plate, as well as the stress level on the bimetallic strip. From the perspective of wear rate and material fatigue, the structure of the adjusting seat connected to the mounting base through the spring plate can achieve the purpose of ensuring the service life of the sealing assembly. At the same time, different shapes of the spring plate can match the position of the second sealing plate relative to the rotor. Therefore, using the spring plate as the connection structure between the bimetallic strip and the mounting base also has the need to adapt to the position of the second sealing plate in different installation positions of the sealing assembly in the radial direction of the air preheater rotor.

[0012] As a further technical solution for the radial sealing assembly at the hot end of the air preheater:

[0013] The mounting base is a bent plate with two bends, which divide the mounting base into a first vertical plate, a horizontal plate and a second vertical plate. From the lower end to the upper end of the mounting base, the first vertical plate, the horizontal plate and the second vertical plate are connected in sequence.

[0014] The spring plate is detachably connected to the second vertical plate. The above solution provides a specific mounting base structure and a method for installing the spring plate on the mounting base. In application, the first vertical plate completes the connection between this component and the rotor. The second vertical plate is located behind the rotor in the direction of rotation, and the spring plate is detachably connected to the second vertical plate. This aims to achieve the following: for this component used in different air preheaters or at different radial positions on the rotor, by adapting spring plates with different elastic properties or sizes, this component can well adapt to the deformation characteristics of the air preheater rotor and the deformation characteristics at the current radial position on the rotor. Preferably, to facilitate the assembly of various parts on this component, the bimetallic strip is bolted to the mounting base, and the mounting base is bolted to the spring plate.

[0015] The second vertical plate has a notch starting at the upper end of the second vertical plate, and the lower end of the spring plate is connected to the bottom side of the notch;

[0016] It also includes a third sealing plate and a first sealing plate. The lower end of the third sealing plate is fixed to the first vertical plate, the first sealing plate spans the notch, and the lower end of the first sealing plate has fixed connection points on both sides of the notch on the second vertical plate.

[0017] There is a gap between the upper end of the third sealing plate and the upper end of the first sealing plate, allowing the second sealing plate to extend upwards. The above solution provides a technical solution for a hot-end radial sealing assembly, including a first sealing plate, a second sealing plate, and a third sealing plate. It also provides a specific installation method for each sealing plate on the mounting base. In this solution, the notch serves as a space to accommodate the spring plate, and both ends of the upper side of the second vertical plate have connection points for the first sealing plate, ensuring the reliability of the connection between the first sealing plate and the mounting base, and maintaining a stable relative position between the first and third sealing plates and the mounting base. The gap is achieved by setting the upper end of the second sealing plate between the upper ends of the first and third sealing plates, allowing the bimetallic strip to operate within a relatively enclosed space. In practical applications, the first and third sealing plates are always kept separated from the fan-shaped plate.

[0018] The width of the gap satisfies the following condition: when the bimetallic strip deforms under heat, the front side of the second sealing plate is supported by the rear side of the third sealing plate under the action of the sector plate on the upper end of the second sealing plate, and the rear side of the second sealing plate is supported by the front side of the first sealing plate. In the above scheme, by controlling the gap width, the aim is to provide support for the front side of the second sealing plate through the rear side of the first sealing plate and for the rear side of the second sealing plate through the front side of the third sealing plate. This structure can effectively optimize the stress on the bimetallic strip and achieve the purpose of protecting the bimetallic strip. Preferably, both the first and third sealing plates are elastic plates. When the second sealing plate contacts and is compressed by the sector plate, the deformation occurring on the first and third sealing plates can optimize the stress on the upper end of the second sealing plate.

[0019] The bottom side of the notch has a slot, and the lower end of the spring plate is embedded in the slot;

[0020] It also includes a locking bolt threaded onto the second vertical plate. The locking bolt extends into the slot and acts on the side of the spring plate, and the spring plate is fixed in the slot by the locking bolt. The above solution provides a specific way to connect the spring plate and the second vertical plate, namely: the spring plate embedded in the slot is clamped in the slot by the pushing of the locking bolt. This solution is not only simple in structure, but also ensures the reliability of the connection between the spring plate and the second vertical plate even if the locking bolt loosens to a certain extent due to vibration, etc., by using the constraint of the slot on the lower end of the spring plate.

[0021] The spring plate is provided with strip-shaped bolt holes that extend along the height direction of the spring plate. The adjusting seat is connected to the spring plate by connecting bolts passing through the strip-shaped bolt holes. This solution provides a specific connection method between the spring plate and the adjusting seat. After loosening the connecting bolts, the connecting bolts slide within the strip-shaped bolt holes, thereby changing the connection position of the adjusting seat along the height direction of the spring plate, allowing the adjusting seat to be adjusted to any position along the strip-shaped bolt holes. In practical applications, the connecting seat can be configured with circular bolt holes for the connecting bolts to pass through. After tightening the connecting bolts, the tension on the connecting bolts completes the fixation of the adjusting seat and the spring plate.

[0022] The adjusting seat is provided with a U-shaped bend, which hooks onto the upper end of the spring plate. This solution provides a specific connection method between the spring plate and the adjusting seat. Specifically, the U-shaped bend is inverted onto the spring plate with its open side facing down, thus hooking the adjusting seat onto the spring plate. In this solution, the characteristic that the U-shaped bend, after being deformed under pressure, can form mating surfaces with both the front and rear sides of the spring plate optimizes the connection reliability between the adjusting seat and the spring plate under vibration conditions.

[0023] It also includes a heat-insulating layer wrapped around the outside of the bimetallic strip. This heat-insulating layer comprises an insulating fabric layer wrapped around the bimetallic strip and an insulating coating adhered to the outside of the insulating fabric layer. The above solution provides a technical solution for reducing the rate of deformation of the bimetallic strip under thermal conditions using a heat-insulating layer. Unlike existing technologies, the insulating fabric layer can serve as a fixed heat-insulating layer on the outside of the bimetallic strip. The insulating fabric layer supports the insulating coating, and specifically, depending on the application of this component in different air preheaters, insulating coatings of different thicknesses or compositions are brushed or sprayed to adjust the heat-insulating capacity of the heat-insulating layer, thereby adjusting the deformation rate of the bimetallic strip under thermal conditions to adapt to the specific deformation rate of the air preheater rotor.

[0024] This solution also relates to an air preheater, including a rotor and a hot-end radial sealing assembly mounted on the rotor, wherein the hot-end radial sealing assembly is any of the hot-end radial sealing assemblies described above. The air preheater in this solution is an air preheater including the hot-end radial sealing assembly described above. As those skilled in the art know, this hot-end radial sealing assembly is mounted on the radial ribs at the upper end of the air preheater rotor via the lower end of a mounting base.

[0025] As a further technical solution for the air preheater:

[0026] Multiple hot-end radial sealing assemblies are continuously arranged in the radial direction of the rotor. This scheme involves installing different hot-end radial sealing assemblies at different radial positions from the inner to the outer side of the rotor. Each hot-end radial sealing assembly acts as a separate unit, achieving radial leakage sealing only within a certain radial dimension range. This addresses the characteristic that different radial positions of the rotor exhibit different deformation amounts after mushroom-shaped deformation. By adjusting the hot-end radial sealing assemblies at each radial position (including but not limited to adjusting the installation height of the mounting base on the spring plate, using spring plates with different dimensions or elastic properties), the hot-end radial sealing assemblies at each radial position can achieve ideal radial sealing capability and good contact with the fan-shaped plate under hot conditions.

[0027] This utility model has the following beneficial effects:

[0028] In this solution, by including an adjustable seat with an adjustable connection position in the height direction of the spring plate and connecting the second sealing plate to the spring plate via a bimetallic strip, this solution can better adapt to the installation position of the sealing assembly in the radial direction of the air preheater rotor. For the application of the second sealing plate contacting the sector plate under the action of the hot bimetallic strip, this solution can ensure the service life of the sealing assembly by adjusting the mounting seat to have a suitable installation height on the spring plate.

[0029] In this solution, unlike setting the mounting base as an elastic structure, the spring plate is more likely to deform under the contact force between the second sealing plate and the sector plate, thus effectively reducing the contact force between the second sealing plate and the sector plate, as well as the stress level on the bimetallic strip. From the perspective of wear rate and material fatigue, the structure of connecting the adjusting seat to the mounting base through the spring plate can ensure the service life of the sealing assembly. At the same time, different shapes of the spring plate can match the position of the second sealing plate relative to the rotor. Therefore, using the spring plate as the connection structure between the bimetallic strip and the mounting base also has the ability to adapt to the position of the second sealing plate at different installation positions of the sealing assembly in the radial direction of the air preheater rotor. Attached Figure Description

[0030] Figure 1 This is a schematic diagram of a specific embodiment of a radial sealing assembly for the hot end of an air preheater as described in this solution. The schematic diagram is a side view.

[0031] Figure 2 This is a structural schematic diagram of a specific embodiment of the radial sealing assembly at the hot end of an air preheater described in this solution. The schematic diagram is a front view.

[0032] Figure 3 This is a front view showing the mating relationship between the mounting base and the spring plate in a specific embodiment of the radial sealing assembly for the hot end of an air preheater described in this solution.

[0033] Figure 4 This is a top view showing the mating relationship between the mounting base and the spring plate in a specific embodiment of the radial sealing assembly for the hot end of an air preheater described in this solution.

[0034] The reference numerals in the attached figures are as follows: 1, first sealing plate; 2, second sealing plate; 3, third sealing plate; 4, adjusting seat; 5, bimetallic strip; 6, mounting seat; 61, first vertical plate; 62, horizontal plate; 63, second vertical plate; 7, spring plate; 8, locking bolt; 9, strip bolt hole; 10, notch. Detailed Implementation

[0035] The present invention will be further described in detail below with reference to the embodiments, but the present invention is not limited to the following embodiments:

[0036] Example 1:

[0037] like Figures 1 to 4As shown, an air preheater hot-end radial sealing assembly includes a mounting base 6, a second sealing plate 2 mounted on the mounting base 6 via a bimetallic strip 5, an adjusting base 4, and a spring plate 7. The lower end of the spring plate 7 is fixedly connected to the mounting base 6, the adjusting base 4 is connected to the upper end of the spring plate 7, one end of the bimetallic strip 5 is fixedly connected to the adjusting base 4, and the other end of the bimetallic strip 5 is fixedly connected to the lower end of the second sealing plate 2. The connection position of the adjusting base 4 in the height direction of the spring plate 7 is adjustable.

[0038] During operation, the rotor of the air preheater exhibits significantly different shapes in cold and hot states. This causes problems such as: the rotor undergoing mushroom-shaped deformation due to heat, leading to an increased gap between the hot end of the rotor and the upper sector plate. This allows high-temperature flue gas from the hot end to leak radially into the low-temperature air side at the cold end, resulting in reduced thermal efficiency of the air preheater. The radial sealing assembly provided in this solution, when applied to the air preheater, is installed on the hot end (upper end) of the air preheater rotor via mounting base 6. The bimetallic strip 5 deforms due to heat, causing the second sealing plate 2 to move upwards relative to the rotor, thereby reducing the gap between it and the sector plate, or maintaining the upper end of the second sealing plate 2 in contact with the sector plate. This achieves the goal of reducing radial leakage of fluid at the hot end of the air preheater and ensuring its thermal efficiency.

[0039] This solution addresses the problem that after the air preheater rotor undergoes mushroom-shaped deformation, different radial positions at the hot end have different deformation amounts compared to the cold state, thus requiring sealing assemblies installed at different radial positions to have different sealing plate position compensation amounts. It provides a technical solution that not only better adapts the installation position of the sealing assembly in the radial direction of the air preheater rotor, but also benefits the service life of the sealing assembly.

[0040] In this design, an adjustable seat 4 with an adjustable connection position in the height direction of the spring plate 7 is included, and the second sealing plate 2 is connected to the spring plate 7 via a bimetallic strip 5. Thus, for sealing assemblies installed at different radial positions on the rotor, the installation height of the adjusting seat 4 on the spring plate 7 is adjusted, allowing the bimetallic strip 5 to have an adjustable installation height on the rotor. For example, after the bimetallic strip 5 undergoes thermal deformation, the second sealing plate 2 can be supported at different heights by adjusting the installation height, thereby controlling the gap between the second sealing plate 2 and its upper sector plate. This allows adjustment of the contact force between the second sealing plate 2 and its upper sector plate. Therefore, when this radial sealing assembly is installed at different radial positions on the rotor... This radial sealing assembly can be adjusted according to its actual installation position in the rotor radial direction. The installation height of the fixed end of the bimetallic strip 5 relative to the rotor can be adjusted to achieve a suitable gap size or contact force. This allows the solution to better adapt the installation position of the sealing assembly in the radial direction of the air preheater rotor. Regarding the application of the second sealing plate 2 in contact with the sector plate under the action of the hot bimetallic strip 5, since the contact force is adjustable, considering the wear rate affected by the magnitude of the contact force between the second sealing plate 2 and the sector plate, and the fatigue effect of the stress level on the bimetallic strip 5, this solution can ensure the service life of the sealing assembly by adjusting the mounting base 6 to have a suitable installation height on the spring plate 7.

[0041] On the other hand, the second sealing plate 2, as the uppermost part of the hot-end radial sealing assembly, is used to contact the sector plate or form the gap. When the second sealing plate 2 contacts the sector plate under the action of the hot bimetallic strip 5, and the spring plate 7 is located behind the upper end of the second sealing plate 2, the spring plate 7 will be subjected to a thrust toward its rear. Under this thrust, the upper end of the spring plate 7 will shift backward, and its elastic properties will decrease to a certain extent under the influence of heat. This differs from setting the mounting base 6 as an elastic structure, because the spring plate 7 is more likely to undergo contact force between the second sealing plate 2 and the sector plate. The deformation effectively reduces the contact force between the second sealing plate 2 and the sector plate, as well as the stress level on the bimetallic strip 5. From the perspective of wear rate and material fatigue, the structure of the adjusting seat 4 connected to the mounting seat 6 through the spring plate 7 can ensure the service life of the sealing assembly. At the same time, the different shapes of the spring plate 7 can match the position of the second sealing plate 2 relative to the rotor. Therefore, using the spring plate 7 as the connection structure between the bimetallic strip 5 and the mounting seat 6 also has the ability to adapt to the position of the second sealing plate 2 at different installation positions of the sealing assembly in the radial direction of the air preheater rotor.

[0042] Example 2:

[0043] This embodiment is a further refinement of embodiment 1:

[0044] The mounting base 6 is a bent plate with two bends, which divide the mounting base 6 into a first vertical plate 61, a horizontal plate 62 and a second vertical plate 63. From the lower end to the upper end of the mounting base 6, the first vertical plate 61, the horizontal plate 62 and the second vertical plate 63 are connected in sequence.

[0045] The spring plate 7 is detachably connected to the second vertical plate 63. The above solution provides a specific structural form of the mounting base 6 and a method for installing the spring plate 7 on the mounting base 6. In application, the first vertical plate 61 completes the connection between this component and the rotor. The second vertical plate 63 is located behind the rotor in the direction of rotation. The spring plate 7 is detachably connected to the second vertical plate 63, aiming to achieve the following: for this component used in different air preheaters or in different radial positions of the rotor, by adapting spring plates 7 with different elastic properties or sizes, this component can well adapt to the deformation characteristics of the air preheater rotor and the deformation characteristics at the current radial position on the rotor. Preferably, to facilitate the assembly of the various parts on this component, the bimetallic strip 5 is bolted to the mounting base 6, and the mounting base 6 is bolted to the spring plate 7.

[0046] Example 3:

[0047] This embodiment is a further refinement of embodiment 2:

[0048] The second vertical plate 63 is provided with a notch 10 starting from the upper end of the second vertical plate 63, and the lower end of the spring plate 7 is connected to the bottom side of the notch 10;

[0049] It also includes a third sealing plate 3 and a first sealing plate 1. The lower end of the third sealing plate 3 is fixed to the first vertical plate 61. The first sealing plate 1 spans the notch 10. The lower end of the first sealing plate 1 has fixed connection points on the second vertical plate 63 located on both sides of the notch 10.

[0050] There is a gap between the upper end of the third sealing plate 3 and the upper end of the first sealing plate 1, allowing the second sealing plate 2 to extend upwards. The above solution provides a technical solution for a hot-end radial sealing assembly, including a sealing plate comprising a first sealing plate 1, a second sealing plate 2, and a third sealing plate 3. It also provides a specific installation method for each sealing plate on the mounting base 6. In this solution, the notch 10 serves as a space to accommodate the spring plate 7, and ensures that both ends of the upper side of the second vertical plate 63 have connection points for the first sealing plate 1, thus guaranteeing the reliability of the connection between the first sealing plate 1 and the mounting base 6, and maintaining a stable relative position between the first sealing plate 1 and the third sealing plate 3 and the mounting base 6. The gap is achieved by setting the upper end of the second sealing plate 2 between the upper ends of the first sealing plate 1 and the third sealing plate 3, allowing the bimetallic strip 5 to operate within a relatively enclosed space. In practical applications, the first sealing plate 1 and the third sealing plate 3 are always kept in a state of separation from the fan-shaped plate.

[0051] Example 4:

[0052] This embodiment is a further refinement of embodiment 3:

[0053] The width of the gap satisfies the following: when the bimetallic strip 5 deforms under heat, under the action of the sector plate on the upper end of the second sealing plate 2, the front side of the second sealing plate 2 is supported by the rear side of the third sealing plate 3, and the rear side of the second sealing plate 2 is supported by the front side of the first sealing plate 1. In the above scheme, by controlling the gap width, the aim is to provide support for the front side of the second sealing plate 2 through the rear side of the first sealing plate 1 and to provide support for the rear side of the second sealing plate 2 through the front side of the third sealing plate 3. This structure can effectively optimize the stress on the bimetallic strip 5 and achieve the purpose of protecting the bimetallic strip 5. Preferably, the first sealing plate 1 and the third sealing plate 3 are both elastic plates. When the second sealing plate 2 contacts and is squeezed by the sector plate, the deformation occurring on the first sealing plate 1 and the third sealing plate 3 can optimize the stress on the upper end of the second sealing plate 2.

[0054] Example 5:

[0055] This embodiment is a further refinement of embodiment 3:

[0056] The bottom side of the notch 10 has a slot, and the lower end of the spring plate 7 is embedded in the slot;

[0057] It also includes a locking bolt 8 threaded onto the second vertical plate 63. The locking bolt 8 extends into the slot and acts on the side of the spring plate 7, and the spring plate 7 is fixed in the slot by the locking bolt 8. The above solution provides a specific connection method between the spring plate 7 and the second vertical plate 63, namely: the spring plate 7, embedded in the slot, is clamped in the slot by the pushing of the locking bolt 8. This solution is not only simple in structure, but also ensures the reliability of the connection between the spring plate 7 and the second vertical plate 63 even if the locking bolt 8 loosens to a certain extent due to vibration, etc., by using the constraint of the slot on the lower end of the spring plate 7.

[0058] Example 6:

[0059] This embodiment is a further refinement of embodiment 1:

[0060] The spring plate 7 is provided with a strip bolt hole 9, which extends along the height direction of the spring plate 7. The adjusting seat 4 is connected to the spring plate 7 by a connecting bolt passing through the strip bolt hole 9. This solution provides a specific connection method between the spring plate 7 and the adjusting seat 4. After loosening the connecting bolt, the connecting bolt slides in the strip bolt hole 9, thereby changing the connection position of the adjusting seat 4 in the height direction of the spring plate 7, allowing the adjusting seat 4 to be adjusted to any position along the strip bolt hole 9. In practical applications, the connecting seat can be configured with a circular bolt hole for the connecting bolt to pass through. After tightening the connecting bolt, the adjusting seat 4 is fixed to the spring plate 7 by tension on the connecting bolt.

[0061] Example 7:

[0062] This embodiment is a further refinement of embodiment 6:

[0063] The adjusting seat 4 is provided with a U-shaped bend, which hooks onto the upper end of the spring plate 7. The above solution provides a specific connection method between the spring plate 7 and the adjusting seat 4. Specifically, the U-shaped bend is inverted onto the spring plate 7 with its open side facing down, thus hooking the adjusting seat 4 onto the spring plate 7. In this solution, the characteristic that the U-shaped bend can form mating surfaces with both the front and rear sides of the spring plate 7 after deformation under pressure is utilized to optimize the connection reliability between the adjusting seat 4 and the spring plate 7 under vibration conditions.

[0064] Example 8:

[0065] This embodiment is a further refinement of embodiment 1:

[0066] It also includes a heat-insulating layer wrapped around the outside of the bimetallic strip 5. The heat-insulating layer includes an insulating fabric layer wrapped around the bimetallic strip 5 and an insulating coating layer adhered to the outside of the insulating fabric layer. The above solution provides a technical solution to reduce the deformation rate of the bimetallic strip 5 under thermal conditions by using a heat-insulating layer. Unlike the prior art, the insulating fabric layer can serve as a heat-insulating layer fixed to the outside of the bimetallic strip 5. The insulating fabric layer is used to support the insulating coating layer. Specifically, depending on the application of this component in different air preheaters, insulating coatings of different thicknesses or compositions are brushed or sprayed to make the heat-insulating capacity of the heat-insulating layer adjustable, thereby making the deformation rate of the bimetallic strip 5 adjustable under thermal conditions and achieving the purpose of adapting to the deformation rate of the specific air preheater rotor.

[0067] Example 9:

[0068] This embodiment, based on Embodiment 1, provides an air preheater including a rotor and a hot-end radial sealing assembly mounted on the rotor. The hot-end radial sealing assembly is the same as that described in Embodiment 1. The air preheater in this solution is an air preheater including the aforementioned hot-end radial sealing assembly. As those skilled in the art will know, this hot-end radial sealing assembly is mounted on the radial ribs at the upper end of the air preheater rotor via the lower end of the mounting base 6.

[0069] Example 10:

[0070] This embodiment is a further refinement of embodiment 9:

[0071] Multiple hot-end radial sealing assemblies are continuously arranged in the radial direction of the rotor. This scheme involves installing different hot-end radial sealing assemblies at different radial positions from the inner to the outer side of the rotor. Each hot-end radial sealing assembly acts as a separate entity, achieving radial leakage sealing only within a certain radial dimension range. Thus, considering the different deformation amounts at different radial positions after the rotor undergoes mushroom-shaped deformation, by adjusting the hot-end radial sealing assemblies at each radial position (including but not limited to adjusting the installation height of the mounting base 6 on the spring plate 7, and using spring plates 7 with different dimensions or elastic properties), the hot-end radial sealing assemblies at each radial position can achieve ideal radial sealing capability and good contact with the fan-shaped plate under hot conditions.

[0072] The above description, in conjunction with specific preferred embodiments, provides a further detailed explanation of the present invention. It should not be construed that the specific embodiments of the present invention are limited to these descriptions. For those skilled in the art, other embodiments derived without departing from the technical solution of the present invention should be included within the protection scope of the present invention.

Claims

1. A radial sealing assembly for the hot end of an air preheater, comprising a mounting base (6) and a second sealing plate (2) mounted on the mounting base (6) via a bimetallic strip (5), characterized in that, It also includes an adjusting seat (4) and a spring plate (7). The lower end of the spring plate (7) is fixedly connected to the mounting seat (6). The adjusting seat (4) is connected to the upper end of the spring plate (7). One end of the bimetallic strip (5) is fixedly connected to the adjusting seat (4), and the other end of the bimetallic strip (5) is fixedly connected to the lower end of the second sealing plate (2). The connection position of the adjusting seat (4) in the height direction of the spring plate (7) is adjustable.

2. The radial sealing assembly for the hot end of an air preheater according to claim 1, characterized in that, The mounting base (6) is a bent plate with two bends, which divide the mounting base (6) into a first vertical plate (61), a horizontal plate (62) and a second vertical plate (63). From the lower end to the upper end of the mounting base (6), the first vertical plate (61), the horizontal plate (62) and the second vertical plate (63) are connected in sequence. The spring plate (7) is detachably connected to the second vertical plate (63).

3. The radial sealing assembly for the hot end of an air preheater according to claim 2, characterized in that, The second vertical plate (63) is provided with a notch (10) starting from the upper end of the second vertical plate (63), and the lower end of the spring plate (7) is connected to the bottom side of the notch (10); It also includes a third sealing plate (3) and a first sealing plate (1), the lower end of the third sealing plate (3) is fixed to the first vertical plate (61), the first sealing plate (1) spans the notch (10), and the lower end of the first sealing plate (1) has fixed connection points on the second vertical plate (63) located on both sides of the notch (10). There is a gap between the upper end of the third sealing plate (3) and the upper end of the first sealing plate (1) for the second sealing plate (2) to extend upward.

4. The radial sealing assembly for the hot end of an air preheater according to claim 3, characterized in that, The width of the gap satisfies the following: when the bimetallic strip (5) deforms under heat, under the action of the fan-shaped plate on the upper end of the second sealing plate (2), the front side of the second sealing plate (2) is supported on the rear side of the third sealing plate (3), and the rear side of the second sealing plate (2) is supported on the front side of the first sealing plate (1).

5. The radial sealing assembly for the hot end of an air preheater according to claim 3, characterized in that, The bottom side of the notch (10) has a slot, and the lower end of the spring plate (7) is embedded in the slot; It also includes a locking bolt (8) threaded onto the second vertical plate (63), the locking bolt (8) extending into the slot and acting on the side of the spring plate (7), the spring plate (7) being fixed in the slot by the locking bolt (8).

6. The radial sealing assembly for the hot end of an air preheater according to claim 1, characterized in that, The spring plate (7) is provided with a strip bolt hole (9), which extends along the height direction of the spring plate (7). The adjusting seat (4) is connected to the spring plate (7) by a connecting bolt passing through the strip bolt hole (9).

7. The radial sealing assembly for the hot end of an air preheater according to claim 6, characterized in that, The adjusting seat (4) is provided with a U-shaped bend, and the adjusting seat (4) is hooked to the upper end of the spring plate (7) through the U-shaped bend hook.

8. The radial sealing assembly for the hot end of an air preheater according to claim 1, characterized in that, It also includes a heat-insulating layer wrapped around the outside of the bimetallic sheet (5), the heat-insulating layer including a heat-insulating fabric layer wrapped around the bimetallic sheet (5) and a heat-insulating coating adhered to the outside of the heat-insulating fabric layer.

9. An air preheater, comprising a rotor and a hot-end radial sealing assembly mounted on the rotor, characterized in that, The hot-end radial sealing assembly is the hot-end radial sealing assembly according to any one of claims 1 to 8.

10. An air preheater according to claim 9, characterized in that, Multiple hot-end radial sealing assemblies are continuously arranged in the radial direction of the rotor.

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