Sealing structure of rotary air preheater

Abstract

The utility model relates to the technical field of air preheater sealing structures, in particular to a rotary air preheater sealing structure which comprises a rotary air preheater, a sealing structural part is arranged in the rotary air preheater, and a sealing movable groove is formed in the sealing structural part. Motors are arranged on the left side and the right side of the interior of the sealing movable groove, lead screws are connected to the upper portions of the two motors, a rotating shaft is sleeved with sealing elastic blocks located in the sealing movable groove, the two lead screws are sleeved with threaded blocks in an engaged mode, and one sides of the two threaded blocks are fixedly connected with connecting rods; the upper end faces of the two connecting rods are fixedly connected with a pressing block located below the sealing elastic block, and the upper end face of the sealing elastic block is fixedly connected with a plurality of pieces of evenly-arranged elastic rubber. The sealing performance between the rotating shaft and the preheater is enhanced, the size of a gap between the rotating shaft and the preheater is reduced, the sealing effect of the rotating shaft is enhanced, and therefore the overall sealing performance is greatly improved.

Description

Technical Field

[0001] This utility model relates to the technical field of air preheater sealing structure, and in particular to a rotary air preheater sealing structure. Background Technology

[0002] Air preheaters are generally referred to simply as air preheaters. They are mostly used in coal-fired power plant boilers and can be divided into two types: tube box type and rotary type. The rotary type is further divided into air hood rotary type and heating surface rotary type. Power plant boilers more commonly use heating surface rotary preheaters. In boiler applications, they are generally two-compartment, three-compartment, or four-compartment types, with four-compartment types being more commonly used in circulating fluidized bed boilers. The air preheater leakage control system is based on technologies such as Alstom, which were first introduced by several major boiler manufacturers and is also a common sealing method in China. The working principle of this seal is to use sensors to automatically monitor the deformation state of the rotor at regular intervals. After the sensor information is transmitted to the actuator, the actuator acts and adjusts the sector plate according to the feedback information, thereby achieving the optimal gap and reducing the leakage rate.

[0003] Existing patent CN222480550U discloses a rotary air preheater sealing structure, including an air preheater body and a lifting structure. The air preheater body includes a shell, a main shaft, a connecting plate, an upper sector plate, a lower sector plate, a rotor, and a sealing plate. The main shaft is connected to the shell, the connecting plate is connected to the main shaft, the upper sector plate is hinged to the connecting plate, the lower sector plate is connected to the main shaft, the rotor is connected to the main shaft, and the sealing plate is connected to the main shaft. The lifting structure includes a reciprocating sliding assembly, a connecting rod, and a rotor. The reciprocating sliding assembly is disposed on one side of the housing, the connecting rod is connected to the reciprocating sliding assembly, the two ends of the rotating rod are respectively hinged to the connecting rod and the mounting plate, and the mounting plate is connected to the upper sector plate. This invention, through the reciprocating sliding assembly, facilitates the movement of the upper sector plate, allows for easy adjustment of the upper sector plate's height, compensates for the increase in the triangular leakage area after continuous wear of the sealing sheet, keeps the triangular leakage area within a stable range, and thus ensures that the leakage volume remains within a stable range, improving energy efficiency.

[0004] However, existing rotary air preheaters, including the outer shell and the rotor mounted on the shaft, primarily function to exchange heat between the air entering the furnace and the flue gas discharged from the furnace. The hot-end center sealing device is installed at the top of the air preheater to prevent the air and flue gas exchanging heat inside the air preheater from leaking out between the rotor and the shaft. Because the rotary air preheater operates at high temperatures for a long time, the shaft will experience thermal expansion and contraction, which will cause changes in the gap between the shaft and the sealing seat. When the gap is too large, the sealing effect will be poor. Utility Model Content

[0005] In order to overcome the problem that the existing shaft expands and contracts with temperature, causing the gap between the shaft and the preheater to increase, thus resulting in a poor sealing effect.

[0006] The technical solution of this utility model is as follows: a rotary air preheater sealing structure, including a rotary air preheater, a sealing structure component is provided inside the rotary air preheater, a sealing movable groove is opened inside the sealing structure component, motors are provided on both the left and right sides inside the sealing movable groove, lead screws are connected above the two motors, a sealing elastic block located inside the sealing movable groove is sleeved on the outside of the rotating shaft, threaded blocks are meshed and connected to the outside of the two lead screws, a connecting rod is fixedly connected to one side of the two threaded blocks, a pressure block located below the sealing elastic block is fixedly connected to the upper end face of the two connecting rods, and multiple uniformly arranged elastic rubbers are fixedly connected to the upper end face of the sealing elastic block.

[0007] Preferably, the rotation of the lead screw is driven by the motor, which causes the threaded block sleeved on the outside of the lead screw to move the connecting rod connected to one side upward. At the same time, the pressure block above the connecting rod will squeeze the sealing elastic block upward, so that the sealing elastic block comes into contact with the inner wall of the sealing structure and rubs against it, thereby reducing the gap between the rotating shaft and the sealing structure and thus improving the overall sealing effect.

[0008] Preferably, all four ends of the rotary air preheater are fixedly connected with reinforcing blocks.

[0009] Preferably, the rotary air preheater is fitted with reinforcing frames at both the front and rear ends.

[0010] Preferably, the rotary air preheater has multiple evenly arranged rotor modules inside, and a top structure is fixedly connected to the top of the rotary air preheater.

[0011] Preferably, a flange connecting plate is provided above the sealing structure and sleeved on the outside of the rotating shaft. The flange connecting plate and the sealing structure are fixedly connected by multiple bolts.

[0012] Preferably, a first fixing plate is provided between the motor and the lead screw, and a second fixing plate is provided above the first fixing plate.

[0013] Preferably, the first fixing plate and the second fixing plate are fixedly connected to the inner wall of the sealing structure, and a coupling is fixedly connected to the lower end face of the second fixing plate.

[0014] The beneficial effects of this utility model are:

[0015] This rotary air preheater sealing structure uses a motor to drive the lead screw to rotate, causing the threaded block that meshes with it on the outside to slowly move up and down. As the threaded block moves up and down, one end of the threaded block moves upward through the connecting rod to the pressure block, which in turn pushes the sealing elastic block upward. At the same time, the sealing elastic block that is sleeved on the outside of the rotating shaft is pressed against the inner wall in the sealing groove, which increases the friction and reduces the gap, thereby improving the overall sealing effect. Attached Figure Description

[0016] Figure 1 The diagram shown is a three-dimensional structural schematic of the rotary air preheater of this utility model.

[0017] Figure 2 This utility model is shown. Figure 1 A magnified schematic diagram of the three-dimensional structure at point A;

[0018] Figure 3 The diagram shown is a three-dimensional structural schematic of the rotating shaft sealing structure of this utility model.

[0019] Figure 4 The diagram shown is a three-dimensional cross-sectional view of the rotating shaft sealing structure of this utility model.

[0020] Figure 5 This utility model is shown. Figure 4 A magnified schematic diagram of the three-dimensional structure at point B.

[0021] Explanation of reference numerals in the attached drawings: 1. Rotary air preheater; 2. Rotor module; 3. Top structure; 4. Shaft; 5. Flange connection plate; 6. Sealing structure; 7. Sealing movable groove; 8. Sealing elastic block; 9. Elastic rubber; 10. First fixing plate; 11. Motor; 12. Lead screw; 13. Threaded block; 14. Second fixing plate; 15. Pressure block; 16. Connecting rod. Detailed Implementation

[0022] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0023] Please see Figures 1-5This utility model provides an embodiment of a rotary air preheater sealing structure, including a rotary air preheater 1, a sealing structure 6 inside the rotary air preheater 1, a sealing movable groove 7 inside the sealing structure 6, motors 11 on both the left and right sides inside the sealing movable groove 7, lead screws 12 connected above the two motors 11, a sealing elastic block 8 located inside the sealing movable groove 7 sleeved on the outside of the rotating shaft 4, threaded blocks 13 meshing and connected to the outside of the two lead screws 12, a connecting rod 16 fixedly connected to one side of the two threaded blocks 13, a pressure block 15 located below the sealing elastic block 8 fixedly connected to the upper end face of the two connecting rods 16, and a plurality of uniformly arranged elastic rubbers 9 fixedly connected to the upper end face of the sealing elastic block 8.

[0024] Please see Figure 1 In this embodiment, four reinforcing blocks are fixedly connected to the four ends of the rotary air preheater 1 to enhance the stability of the rotary air preheater 1. Reinforcing frames are sleeved at both the front and rear ends of the rotary air preheater 1 to provide a stabilizing effect. Multiple evenly arranged rotor modules 2 are arranged inside the rotary air preheater 1. A top structure 3 is fixedly connected to the top of the rotary air preheater 1. The operation of the motor 11 drives the lead screw 12 connected to the top to rotate. When the lead screw 12 rotates, the threaded block 13 sleeved and meshed with it on the outside slowly moves up and down. When the threaded block 13 moves up and down, one end of the threaded block 13 is moved upward through the pressure block 15 connected to the connecting rod 16.

[0025] Please see Figures 2-5 In this embodiment, a flange connecting plate 5 is provided above the sealing structure 6 and sleeved on the outside of the rotating shaft 4. The flange connecting plate 5 is fixedly connected to the sealing structure 6 by multiple bolts. The flange connecting plate 5 strengthens the connection effect with the rotary air preheater 1. A first fixing plate 10 is provided between the motor 11 and the lead screw 12. A second fixing plate 14 is provided above the first fixing plate 10 to fix the connection between the motor 11 and the lead screw 12 and realize its rotational movement effect. The first fixing plate 10 and the second fixing plate 14 are fixedly connected to the inner wall of the sealing structure 6. A coupling is fixedly connected to the lower end face of the second fixing plate 14 for the rotation of the lead screw 12, which strengthens the squeezing and sealing effect of the pressure block 15 on the sealing elastic block 8. The pressure block 15 squeezes the sealing elastic block 8 upward, and at the same time, the sealing elastic block 8 sleeved on the outside of the rotating shaft 4 is squeezed against the inner wall in the sealing movable groove 7, which increases the friction and reduces the gap between them, thereby improving the overall sealing effect.

[0026] During operation, the motor 11 drives the lead screw 12 connected above to rotate. As the lead screw 12 rotates, the threaded block 13, which is sleeved on the outside and meshes with it, slowly moves up and down. When the threaded block 13 moves up and down, one end of the threaded block 13 moves upward through the pressure block 15 connected to the connecting rod 16. The pressure block 15 presses the sealing elastic block 8 upward, and at the same time, the sealing elastic block 8 sleeved on the outside of the rotating shaft 4 is pressed against the inner wall in the sealing movable groove 7, which increases the friction and reduces the gap between them, thereby improving the overall sealing effect.

[0027] Through the above steps, the rotation of the lead screw 12 driven by the motor 11 causes the threaded block 13, which is sleeved and meshed with it, to slowly move up and down. When the threaded block 13 moves up and down, one end of the threaded block 13 moves upward through the pressure block 15 connected by the connecting rod 16. This solves the problem that the existing rotating shaft 4 will expand and contract with temperature, resulting in a larger gap between the rotating shaft 4 and the preheater, which leads to a poor sealing effect.

Claims

1. A rotary air preheater sealing structure, comprising a rotary air preheater (1), characterized in that: The rotary air preheater (1) is equipped with a sealing structure (6) inside. The sealing structure (6) has a sealing movable groove (7) inside. Motors (11) are installed on both the left and right sides inside the sealing movable groove (7). Screws (12) are connected above the two motors (11). A sealing elastic block (8) located inside the sealing movable groove (7) is sleeved on the outside of the rotating shaft (4). Threaded blocks (13) are meshed and sleeved on the outside of the two screws (12). A connecting rod (16) is fixedly connected to one side of the two threaded blocks (13). A pressure block (15) located below the sealing elastic block (8) is fixedly connected to the upper end face of the two connecting rods (16). Multiple evenly arranged elastic rubbers (9) are fixedly connected to the upper end face of the sealing elastic block (8).

2. The rotary air preheater sealing structure according to claim 1, characterized in that: The four ends of the rotary air preheater (1) are all fixedly connected with reinforcing blocks.

3. The rotary air preheater sealing structure according to claim 1, characterized in that: The rotary air preheater (1) has a reinforcing frame attached to both the front and rear ends.

4. The rotary air preheater sealing structure according to claim 1, characterized in that: The rotary air preheater (1) has multiple uniformly arranged rotor modules (2) inside, and a top structure (3) is fixedly connected to the top of the rotary air preheater (1).

5. The rotary air preheater sealing structure according to claim 1, characterized in that: A flange connecting plate (5) is provided above the sealing structure (6) and is sleeved on the outside of the rotating shaft (4). The flange connecting plate (5) and the sealing structure (6) are fixedly connected by multiple bolts.

6. The rotary air preheater sealing structure according to claim 1, characterized in that: A first fixing plate (10) is provided between the motor (11) and the lead screw (12), and a second fixing plate (14) is provided above the first fixing plate (10).

7. The rotary air preheater sealing structure according to claim 6, characterized in that: The first fixing plate (10) and the second fixing plate (14) are fixedly connected to the inner wall of the sealing structure (6), and a coupling is fixedly connected to the lower end face of the second fixing plate (14).

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