Constant multi-channel flexible sealing structure with constant force spring support for rotary heat exchanger

Abstract

This utility model relates to the field of heat exchanger technology, and in particular to a constant multi-channel flexible sealing structure for a rotary heat exchanger with constant force spring support. It includes several rotor compartment partitions arranged in a ring array. Multiple sealing structures are fixedly installed on the upper side of each rotor compartment partition. At the connection between the rotor compartment partition and the multiple sealing structures, a first, second, and third fastening point are sequentially arranged in the direction away from the central axis. The second fastening point is a fixed point, while the first and third fastening points are floating points, so that the downward deformation of the rotor is not affected by the fastening. A fan-shaped plate is fixedly installed at the upper end of the multiple sealing structure. Compared with the original seal, this utility model can adapt to multiple operating conditions of the unit, ensuring sealing effect under different load conditions and maintaining a low air leakage rate. At the same time, the on-site installation and adjustment workload is small, and maintenance and replacement are simple.

Description

Technical Field

[0001] This utility model relates to the field of heat exchanger technology, and in particular to a constant multi-channel flexible sealing structure for a rotary heat exchanger with constant force spring support. Background Technology

[0002] Rotary air preheaters and flue gas heaters are widely used in thermal power and steel industries. The heat exchange medium is flue gas and air. They adopt counter-current heat exchange, and heat is converted by the continuous rotation of heat storage elements arranged inside the heat exchanger. Due to the temperature difference between the high-temperature end and the low-temperature end inside the heat exchanger, the difference in thermal expansion deformation between the high-temperature end and the low-temperature end of the rotor causes the rotor to deform into a mushroom shape while rotating. A gap is generated between the hot-end fan-shaped plate and the rotor. In addition, there is a pressure difference between the heat exchange medium on both sides, which can lead to leakage. The air leakage rate increases and affects the heat exchange performance of the unit.

[0003] First, the existing sealing structure requires detailed calculations of the rotor's deformation. Based on these calculations, the sealing plates and sector plates are adjusted. However, in actual operation, parameters such as flue gas volume and temperature significantly affect rotor deformation, often leading to discrepancies between theoretical calculations and actual conditions. This results in the sector plates and sealing plates not fitting properly, increasing air leakage. Furthermore, on-site adjustments are extensive, requiring adjustments to hundreds of sealing plates across the entire rotor. The quality of these adjustments directly impacts the air leakage rate, introducing a degree of uncertainty. During hot operation, as the rotor deforms downwards, the hot-end sector plates move further away from the sealing plates, causing a significant increase in hot-end air leakage. Summary of the Invention

[0004] The purpose of this invention is to address the shortcomings of the prior art by proposing a constant multi-channel flexible sealing structure for a rotary heat exchanger with constant force spring support.

[0005] To achieve the above objectives, the technical solution adopted by this utility model is as follows: a constant multi-channel flexible sealing structure for a rotary heat exchanger with constant force spring support, comprising several rotor compartment partitions arranged in an annular array, wherein multiple sealing structures are fixedly installed on the upper side of the rotor compartment partitions, and a first fastening point, a second fastening point, and a third fastening point are sequentially arranged at the connection between the rotor compartment partitions and the multiple sealing structures in the direction away from the central axis, wherein the second fastening point is a fixed point, and the first and third fastening points are floating points, and the downward deformation of the rotor is not affected by the fastening, and a fan-shaped plate is fixedly installed at the upper end of the multiple sealing structures.

[0006] Preferably, the first fastening point includes an L-shaped sealing plate, which fixes the rotor compartment partition to the multi-seal structure by a bolt assembly.

[0007] Preferably, a central shaft outer seal is fixedly installed at the adjacent ends of several rotor compartment partitions, a hot end static sealing cylinder is fixedly installed at the upper end of the central shaft outer seal, a patterned fan-shaped compartment flange device is connected to the upper part of the ends of several rotor compartment partitions near the central shaft outer seal, several constant force spring support devices are provided on one side surface of the rotor compartment partitions, and an outer sealing plate is fixedly installed at the ends of several rotor compartment partitions away from the central shaft outer seal.

[0008] Preferably, the second fastening point includes an L-shaped sealing plate, which fixes the rotor compartment partition to the multi-seal structure by a bolt assembly. Compensation gaskets are respectively installed between the multi-seal structure and the L-shaped sealing plate, and between the multi-seal structure and the rotor compartment partition.

[0009] Preferably, the third fastening point includes a pressure plate, which secures the rotor compartment partition to the multi-seal structure via a bolt assembly.

[0010] Preferably, the bolt assembly includes a sleeve that fixes through the rotor compartment partition and the multi-seal structure, a fastening bolt that slides through the inner side of the sleeve, washers that slide on both ends of the outer surface of the fastening bolt, a nut that is threaded onto one end of the fastening bolt, and the nut presses against the side surface of one washer.

[0011] Preferably, the multi-seal structure includes two bent sealing plates and one straight sealing plate, with the two bent sealing plates respectively fixedly installed on the two side surfaces of the straight sealing plate.

[0012] Compared with the prior art, the present invention has the following beneficial effects:

[0013] Compared with the original seal, this utility model can adapt to the operation of the unit under multiple working conditions, ensure the sealing effect under different load conditions, maintain a low air leakage rate, and at the same time, the on-site installation and adjustment workload is small, and maintenance and replacement are simple. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of a constant multi-channel flexible sealing structure with constant force spring support for a rotary heat exchanger according to the present invention.

[0015] Figure 2 This is a cross-sectional view of the first fastening point of a constant multi-channel flexible sealing structure with constant force spring support for a rotary heat exchanger according to this utility model.

[0016] Figure 3 This utility model relates to a constant multi-channel flexible sealing structure for a rotary heat exchanger with constant force spring support. Figure 2 Enlarged view of point A in the middle;

[0017] Figure 4 This is a partial structural diagram of a constant multi-channel flexible sealing structure with constant force spring support for a rotary heat exchanger according to this utility model.

[0018] Figure 5 This utility model relates to a constant multi-channel flexible sealing structure for a rotary heat exchanger with constant force spring support. Figure 4 Enlarged view at point B in the middle;

[0019] Figure 6 This utility model relates to a constant multi-channel flexible sealing structure for a rotary heat exchanger with constant force spring support. Figure 4 Enlarged view at point C;

[0020] Figure 7 This is a cross-sectional view of the second fastening point of a constant multi-channel flexible sealing structure with constant force spring support for a rotary heat exchanger according to this utility model.

[0021] Figure 8 This utility model relates to a constant multi-channel flexible sealing structure for a rotary heat exchanger with constant force spring support. Figure 7 Enlarged view at point D;

[0022] Figure 9 This is a cross-sectional view of the third fastening point of a constant multi-channel flexible sealing structure with constant force spring support in a rotary heat exchanger according to this utility model.

[0023] Figure 10 This utility model relates to a constant multi-channel flexible sealing structure for a rotary heat exchanger with constant force spring support. Figure 9 Enlarged view of point E in the middle.

[0024] The components include: 1. Rotor compartment partition; 2. L-shaped sealing plate; 3. Multi-seal structure; 31. Bending sealing sheet; 32. Straight sealing sheet; 4. Sleeve; 5. Sector plate; 6. Fastening bolt; 7. Nut; 8. Washer; 9. Constant force spring support device; 10. Outer sealing plate; 11. Pattern sector flange device; 12. Central shaft outer seal; 13. Hot end static sealing cylinder; 14. Compensating gasket; 15. Pressure plate; 100. First fastening point; 200. Second fastening point; 300. Third fastening point. Detailed Implementation

[0025] The following description is intended to disclose the present invention so that those skilled in the art can implement it. The preferred embodiments described below are merely examples, and other obvious variations will occur to those skilled in the art.

[0026] like Figures 1-10As shown, according to the law of mushroom-shaped deformation of the rotor of a rotary heat exchanger, the sealing strip within the inner third of the rotor radial seal will only expand upward uniformly with the rotor when heated, and will not sag. The sealing strip within the outer two-thirds of the rotor radial seal will sag downward in a mushroom shape due to uneven expansion of the hot and cold ends of the rotor. Therefore, the rotor radial seal in this scheme is divided into inner seal and outer seal, which are separated by one-third of the rotor radial seal and together form the rotor radial seal structure. Based on this idea, the adopted solution is a constant multi-channel flexible sealing structure with constant force spring support for a rotary heat exchanger, including several rotor compartment partitions 1 arranged in a ring array. Multiple sealing structures 3 are fixedly installed on the upper side of the rotor compartment partitions 1. At the connection between the rotor compartment partitions 1 and the multiple sealing structures 3, a first fastening point 100, a second fastening point 200 and a third fastening point 300 are arranged sequentially in the direction away from the central axis. The second fastening point 200 is a fixed point, and the first fastening point 100 and the third fastening point 300 are floating points. The downward deformation of the rotor is not affected by the fastening. A fan-shaped plate 5 is fixedly installed on the upper end of the multiple sealing structures 3.

[0027] like Figure 1 , Figure 2 , Figure 3 As shown, the first fastening point 100 includes an L-shaped sealing plate 2, which fixes the rotor compartment partition 1 to the multi-seal structure 3 by a bolt assembly.

[0028] A central shaft outer seal 12 is fixedly installed at the close ends of several rotor compartment partitions 1. A hot end static sealing cylinder 13 is fixedly installed at the upper end of the central shaft outer seal 12. A patterned sector flange device 11 is connected above the ends of several rotor compartment partitions 1 near the central shaft outer seal 12. Several constant force spring support devices 9 are provided on one side surface of the rotor compartment partitions 1. An outer sealing plate 10 is fixedly installed at the ends of several rotor compartment partitions 1 away from the central shaft outer seal 12.

[0029] like Figure 1 , Figure 7 , Figure 8 As shown, the second fastening point 200 includes an L-shaped sealing plate 2. The L-shaped sealing plate 2 is used to fix the rotor compartment partition 1 to the multi-seal structure 3 by bolt assembly. Compensating shims 14 are respectively installed between the multi-seal structure 3 and the L-shaped sealing plate 2, and between the multi-seal structure 3 and the rotor compartment partition 1. The compensating shims 14 are used to fill the sliding gap between the multi-seal structure 3, the L-shaped sealing plate 2, and the rotor compartment partition 1, thereby achieving a fastening effect.

[0030] like Figure 1 , Figure 9 , Figure 10As shown, the third fastening point 300 includes a pressure plate 15, which fixes the rotor compartment partition 1 to the multi-seal structure 3 via a bolt assembly. Due to the mushroom-shaped deformation characteristics of the rotor in hot conditions, the inner radial sealing structure in this invention is one-third of the inner radial seal, which expands uniformly upwards with the rotor and does not undergo mushroom-shaped sagging deformation. Therefore, a conventional multi-seal structure 3 is adopted. The multi-seal structure 3 is pressed by the pressure plate 15 and fastened by the bolt assembly, so that the multi-seal structure 3 can expand and move together with the rotor compartment partition 1, maintaining a small gap with the fan-shaped plate 5 to ensure the sealing effect. In addition, the inner radial seal, the central shaft outer seal 12, and the hot end static sealing cylinder 13 together form the inner seal.

[0031] The bolt assembly includes a sleeve 4 that fixes the rotor compartment partition 1 and the multi-seal structure 3. A fastening bolt 6 slides through the inner side of the sleeve 4. Washers 8 are slidably fitted at both ends of the outer surface of the fastening bolt 6. A nut 7 is threaded onto one end of the fastening bolt 6, and the nut 7 presses against the side surface of one washer 8.

[0032] The floating working principle of the outer radial sealing sheet is as follows: The sleeve 4 is welded to the L-shaped sealing plate 2 as a whole. The L-shaped sealing plate 2 is connected to the rotor compartment partition 1 by a bolt assembly, allowing the L-shaped sealing plate 2 and the rotor compartment partition 1 to move together. During hot operation, the L-shaped sealing plate 2 and the rotor compartment partition 1 undergo mushroom-shaped deformation synchronously. The lower part of the multi-seal sheet of the multi-seal structure 3 has a waist-shaped hole. For the outer side, due to the gap between the multi-seal structure 3 and the rotor compartment partition 1 and L-shaped sealing plate 2, the rotor compartment partition 1 and L-shaped sealing plate 2 can slide downward within the waist-shaped hole of the multi-seal structure 3 when undergoing mushroom-shaped sagging deformation. For the inner side, due to the addition of the compensation gasket 14, the multi-seal structure 3 is completely fastened to the rotor compartment partition 1 and L-shaped sealing plate 2, and will move synchronously with the rotor compartment partition 1 and L-shaped sealing plate 2. This forms a fixed point, that is, the entire outer radial sealing sheet forms a shape where the inner side is fixed and the outer side is free to float. In this configuration, two constant force spring support devices 9 are installed in the single-channel mode of the compartment partition, located at the outermost and middle positions of the outer radial sealing plate. The support end of the constant force spring support device 9 is welded to the multi-channel sealing structure 3, and the fixed end is welded to the rotor compartment partition 1. The upward supporting force of the spring is approximately twice the weight of the floating part, causing the seal to bend slightly upward under the support of the spring after being heated. Due to the waist-shaped hole design of the multi-channel sealing structure 3, there is a certain limitation on the upward bending of the multi-channel sealing structure 3, preventing it from bending excessively upward, which would affect the safe operation of the unit. Since the part of the multi-channel sealing structure 3 inserted into the L-shaped sealing plate 2 is much larger than the relative sliding part, when the rotor compartment partition 1 and the L-shaped sealing plate 2 deform, the L-shaped sealing plate 2 and the multi-channel sealing structure 3 still overlap, maintaining a small gap between the multi-channel sealing structure 3 and the fan-shaped plate 5 to ensure the sealing effect. In addition, an outer sealing plate 10 is arranged on the outermost side of the rotor to form a seal on the outer side of the radial seal.

[0033] The multi-seal structure 3 includes two bent sealing plates 31 and one straight sealing plate 32. The two bent sealing plates 31 are fixedly installed on both sides of the straight sealing plate 32. During manufacturing, the two bent sealing plates 31 and the straight sealing plate 32 are welded together to form a whole.

[0034] Compared with the original seal, this solution can adapt to the unit's multi-condition operation, ensure the sealing effect under different loads, maintain a low air leakage rate, and at the same time, the on-site installation and adjustment workload is small, and maintenance and replacement are simple.

[0035] The foregoing has shown and described the basic principles, main features, and advantages of this utility model. Those skilled in the art should understand that this utility model is not limited to the above embodiments. The embodiments and descriptions in the specification are merely principles of this utility model. Various changes and modifications can be made to this utility model without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claimed utility model. The scope of protection of this utility model is defined by the appended claims and their equivalents.

Claims

1. A constant multi-channel flexible sealing structure for a rotary heat exchanger with constant force spring support, comprising several rotor compartment partitions (1) arranged in a ring array, characterized in that: The upper side of the rotor compartment partition (1) is fixedly installed with multiple sealing structures (3). The connection between the rotor compartment partition (1) and the multiple sealing structures (3) is provided with a first fastening point (100), a second fastening point (200) and a third fastening point (300) in sequence in the direction away from the central axis. The second fastening point (200) is a fixed point, and the first fastening point (100) and the third fastening point (300) are floating points. The downward deformation of the rotor is not affected by the fastening. A fan-shaped plate (5) is fixedly installed at the upper end of the multiple sealing structures (3).

2. The constant multi-channel flexible sealing structure of a rotary heat exchanger with constant force spring support according to claim 1, characterized in that: The first fastening point (100) includes an L-shaped sealing plate (2), which fixes the rotor compartment partition (1) to the multi-seal structure (3) by a bolt assembly.

3. The constant multi-channel flexible sealing structure of a rotary heat exchanger with constant force spring support according to claim 1, characterized in that: A central shaft outer seal (12) is fixedly installed at the close ends of several rotor compartment partitions (1). A hot end static sealing cylinder (13) is fixedly installed at the upper end of the central shaft outer seal (12). A patterned sector flange device (11) is connected above the end of several rotor compartment partitions (1) near the central shaft outer seal (12). Several constant force spring support devices (9) are provided on one side surface of the rotor compartment partitions (1). An outer sealing plate (10) is fixedly installed at the end of several rotor compartment partitions (1) away from the central shaft outer seal (12).

4. The constant multi-channel flexible sealing structure of a rotary heat exchanger with constant force spring support according to claim 1, characterized in that: The second fastening point (200) includes an L-shaped sealing plate (2), which fixes the rotor compartment partition (1) to the multi-seal structure (3) by bolt assembly. Compensation gaskets (14) are respectively installed between the multi-seal structure (3) and the L-shaped sealing plate (2) and between the multi-seal structure (3) and the rotor compartment partition (1).

5. A constant multi-channel flexible sealing structure for a rotary heat exchanger with constant force spring support according to claim 1, characterized in that: The third fastening point (300) includes a pressure plate (15), which fixes the rotor compartment partition (1) to the multi-seal structure (3) by a bolt assembly.

6. A constant multi-channel flexible sealing structure for a rotary heat exchanger with constant force spring support according to any one of claims 2, 4, and 5, characterized in that: The bolt assembly includes a sleeve (4) that fixes through the rotor compartment partition (1) and the multi-seal structure (3). A fastening bolt (6) slides through the inner side of the sleeve (4). Washers (8) are slidably fitted at both ends of the outer surface of the fastening bolt (6). A nut (7) is threaded onto one end of the fastening bolt (6), and the nut (7) presses against the side surface of a washer (8).

7. A constant multi-channel flexible sealing structure for a rotary heat exchanger with constant force spring support according to claim 1, characterized in that: The multi-seal structure (3) includes two bent sealing plates (31) and one straight sealing plate (32), with the two bent sealing plates (31) respectively fixedly installed on the two sides of the straight sealing plate (32).

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