Elastic sealing device for main shaft of composite air pre-heater

Abstract

The utility model relates to the technical field of sealing, in particular to an elastic sealing device for a main shaft of a composite air pre-heater, which comprises the main shaft sleeved with a rotatable packing. A hedging sealing mechanism and an elastic sealing mechanism which are used for sealing a gap between the main shaft and the packing are arranged on the main shaft, the hedging sealing mechanism is in contact with the packing, and the hedging sealing mechanism is located on the elastic sealing mechanism; the hedging sealing mechanism comprises a metal sealing air chamber, the main shaft is sleeved with the metal sealing air chamber, a hedging air chamber is formed in the metal sealing air chamber, and the hedging air chamber is communicated with a gap between the main shaft and the packing through an annular groove. The technical problems that hot air blown out of a gap between a main shaft and a packing possibly melts a rubber block, so that the sealing effect cannot be achieved, and an air sealing device cannot operate normally easily are solved.

Description

Technical Field

[0001] This utility model relates to the field of sealing technology, and specifically discloses a composite air preheater spindle elastic sealing device. Background Technology

[0002] Air preheater main shaft seals typically use packing. As the equipment ages, during operation, the gap between the main shaft and the packing seal base becomes eccentric. The packing seal is prone to wear and lacks elasticity, making it unable to self-compensate. Even after replacement and installation, gaps still remain on the side with larger gaps, and as the main shaft rotates, the packing seal is squeezed out from the larger gap, resulting in air and powder leakage. At the same time, the blown hot air causes the gearbox temperature to rise, contaminating the gearbox gear oil, increasing maintenance costs, polluting the site environment, and reducing the equipment's service life.

[0003] For example, utility model patent number 2019205432989 discloses an elastic airtight sealing device, including a pressure cap assembly for sealingly connecting to the end cover of the equipment, the pressure cap assembly having a receiving cavity on the side facing the main shaft; a sealing assembly for sleeved on the main shaft, the sealing assembly being embedded in the receiving cavity and forming an air chamber between it and the pressure cap assembly; the pressure cap assembly having a vent hole for connecting to an external air source device, the vent hole communicating with the air chamber. Existing airtight sealing devices all use sealing blocks with a certain degree of plasticity, such as rubber blocks, for sealing. Since the air blown out from the gap between the main shaft and the packing may cause the rubber block to melt, thus failing to achieve the sealing function. Operators need to regularly inspect and replace the rubber block to ensure the normal operation of the airtight sealing device. Utility Model Content

[0004] In view of this, the purpose of this utility model is to provide a composite air preheater spindle elastic sealing device to solve the technical problem that hot air blown out from the gap between the spindle and the packing may cause the rubber block to melt, thus failing to play a sealing role and easily leading to the air sealing device malfunctioning.

[0005] To achieve the above objectives, this utility model provides the following technical solution: a composite air preheater main shaft elastic sealing device, comprising a main shaft, on which a rotatable packing is fitted; the main shaft is provided with an anti-collision sealing mechanism and an elastic sealing mechanism for sealing the gap between the main shaft and the packing, the anti-collision sealing mechanism being in contact with the packing and located on the elastic sealing mechanism; the anti-collision sealing mechanism includes a metal sealing chamber fitted on the main shaft, the metal sealing chamber having an anti-collision chamber formed therein, the anti-collision chamber communicating with the gap between the main shaft and the packing through an annular groove. Through the cooperation of the anti-collision sealing mechanism and the elastic sealing mechanism, the main shaft and the packing are sealed, preventing the heat seal blown out between the main shaft and the packing from causing the gearbox temperature to rise, thus increasing maintenance costs.

[0006] Furthermore, the counter-sealing mechanism also includes two sets of valves, each equipped with an air supply pipe, both of which are connected to a pressurized air supply device. The metal sealing chamber contacts the packing, with an annular groove at one end located on the side in contact with the packing. The other end of the metal sealing chamber is tightly connected to the main shaft. The counter-sealing mechanism seals the main shaft and packing, reducing the operating temperature and allowing for cleaning of the gap between the main shaft and packing, thus reducing the frequency of main shaft seal maintenance.

[0007] Furthermore, the elastic sealing mechanism includes a rubber sealing block, which is fitted onto the main shaft. The rubber sealing block is not in contact with the metal sealing chamber. An inclined block and a connecting block are fixedly connected to the rubber sealing block. A second sealing cavity is formed within the connecting block, with its opening facing the main shaft. A first sealing cavity is formed on the rubber sealing block, and a first annular spring is fitted onto the connecting block. The elastic sealing mechanism is used to seal the gas leaking from the anti-flush sealing mechanism, thereby ensuring the sealing effect. Simultaneously, the elastic sealing mechanism, through the cooperation of dynamic and static sealing, improves the service life and sealing effect of the main shaft seal.

[0008] Furthermore, a W-shaped block is provided inside the first sealing cavity. The W-shaped block has a W-shaped cross-section and contacts the main shaft. A second annular spring is fitted onto the W-shaped block. The second annular spring fixes the W-shaped block to the main shaft, allowing the W-shaped block to rotate with the main shaft, thereby forming a dynamic seal.

[0009] Furthermore, the packing is provided with a fastening mechanism, which includes a first clamping block and a second clamping block. The first clamping block is located between the metal sealing chamber and the rubber sealing block. The first clamping block, the inclined block, and the metal sealing chamber form a connecting cavity, with the inclined block located within the connecting cavity. The second clamping block is located on the rubber sealing block. Several sets of threaded posts are fixedly connected to the packing, each set of threaded posts passing through the first and second clamping blocks. Two sets of nuts are mounted on each threaded post, located below the first and second clamping blocks respectively. The fastening mechanism is used to fix the counter-sealing mechanism and the elastic sealing mechanism, ensuring a seal between the main shaft and the packing.

[0010] The working principle and beneficial effects of this solution are as follows:

[0011] In use, the anti-flush sealing mechanism and the elastic sealing mechanism are directly installed on the packing, and the anti-flush sealing mechanism and the elastic sealing mechanism are fixed on the packing through the fastening mechanism. There are no special requirements for the structure of the packing and the spindle, which improves the adaptability during installation.

[0012] The countersunk sealing mechanism improves the sealing performance of the metal sealing chamber by introducing clean sealing air into it, while reducing the ambient temperature of the sealing working surface. It also cleans the area between the spindle and the packing, reducing the frequency and cost of spindle seal maintenance.

[0013] The elastic sealing mechanism consists of dynamic and static dual seals, which have a self-compensation function that existing packing seals cannot match, improving the service life and sealing effect of the spindle seal, and will not cause wear to the spindle.

[0014] Other advantages, objectives, and features of this invention will be set forth in part in the description which follows, and in part will be apparent to those skilled in the art from the following examination and study, or may be learned from practice of this invention. The objectives and other advantages of this invention can be realized and obtained through the following description. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the structure of an embodiment;

[0016] Figure 2 Exploded view of an embodiment;

[0017] Figure 3 This is a cross-sectional schematic diagram of an embodiment;

[0018] Figure 4 for Figure 3 Enlarged diagram of point A in the middle.

[0019] The following are the markings in the attached diagram: main shaft 1, packing 2, metal sealing air chamber 3, counter-current air chamber 4, valve 5, air supply pipe 6, rubber sealing block 7, tilting block 8, connecting cavity 9, first sealing cavity 10, connecting block 11, second sealing cavity 13, first annular spring 14, W-shaped block 15, second annular spring 16, first clamping block 17, second clamping block 18, threaded column 19, nut 20. Detailed Implementation

[0020] The following detailed description illustrates the specific implementation method:

[0021] Example

[0022] like Figures 1 to 4 As shown, a composite air preheater main shaft elastic sealing device is disclosed, including a main shaft 1, a rotatable packing 2 on the main shaft 1, and a counter-seal mechanism on the main shaft 1. The counter-seal mechanism includes a metal sealing chamber 3, which is fitted onto the main shaft 1 and dynamically sealed to the main shaft 1. One end of the metal sealing chamber 3 contacts the packing 2, and a counter-seal chamber 4 is provided in the metal sealing chamber 3. An annular groove is provided at the end of the counter-seal chamber 4 near the packing 2. The counter-seal chamber 4 communicates with the gap between the main shaft 1 and the packing 2. The end of the counter-seal chamber 4 away from the packing 2 is tightly connected to the main shaft 1. Two sets of valves 5 are fixedly connected to the main shaft 1, and each set of valves 5 is provided with an air supply pipe 6, which is connected to a pressurized air supply device.

[0023] An elastic sealing mechanism is provided on the main shaft 1. The elastic sealing mechanism includes a rubber sealing block 7, which is fitted on the main shaft 1 and dynamically sealed to the main shaft 1. An inclined block 8 and a connecting block 11 are fixedly connected to both ends of the rubber sealing block 7, respectively. The inclined block 8 is located at the end closer to the metal sealing air chamber 3, and the connecting block 11 is located at the end away from the metal sealing air chamber 3. A second sealing cavity 13 is opened in the connecting block 11. A first sealing cavity 10 is opened on the rubber sealing block 7. A W-shaped block 15 is provided in the first sealing cavity 10. The W-shaped block 15 has a W-shaped cross section and contacts the main shaft 1. A second annular spring 16 is fitted on the W-shaped block 15.

[0024] The packing 2 is equipped with a fastening mechanism, which includes a first clamping block 17 and a second clamping block 18. The first clamping block 17 is located between the metal sealing air chamber 3 and the rubber sealing block 7. The first clamping block 17, the inclined block 8, and the metal sealing air chamber 3 form a connecting cavity 9. The second clamping block 18 is located between the rubber sealing block 7 and the connecting block 11. Several sets of threaded posts 19 are fixedly connected to the packing 2. The several sets of threaded posts 19 are all mounted on the first clamping block 17 and the second clamping block 18. Two sets of nuts 20 are mounted on each of the several sets of threaded posts 19. The two sets of nuts 20 are threadedly connected to the threaded posts 19. One set of nuts 20 is located below the first clamping block 17 and in contact with the first clamping block 17. The other set of nuts 20 is located below the second clamping block 18 and in contact with the nuts 20.

[0025] A first annular spring 14 is fitted onto the packing 2 of the main spindle 1. Both the first annular spring 14 and the second annular spring 16 are formed by connecting the ends of the springs. The first annular spring 14 is used to fasten the packing 2 of the main spindle 1 so that the packing 2 of the main spindle 1 is in close contact with the main spindle 1. The second annular spring 16 is used to fasten the W-shaped block 15 so that the W-shaped block 15 is in close contact with the main spindle 1.

[0026] The pressurized air supply device, the first annular spring 14, and the second annular spring 16 are technical means commonly used by those skilled in the art, and their structure, connection method, and usage are well known to those skilled in the art.

[0027] In practice

[0028] In use, the operator first mounts the metal-sealed air chamber 3 onto the main shaft 1. Then, the first clamping block 17 is moved below the metal-sealed air chamber 3, and the threaded post 19 is inserted into the first clamping block 17. Nuts 20 are then screwed into each set of threaded posts 19 and tightened. The metal-sealed air chamber 3 is fixed by the first clamping block 17, ensuring tight contact between the metal-sealed air chamber 3 and the packing 2. Next, the operator mounts the W-shaped block 15 onto the main shaft 1, and then mounts the second annular spring 16 onto the W-shaped block 15. Spring 16 fixes W-shaped block 15 to main shaft 1. At this time, W-shaped block 15 can rotate with main shaft 1. Then, the operator puts rubber sealing block 7 on main shaft 1, so that W-shaped block 15 and second ring spring 16 are located in first sealing cavity 10, and the two ends of W-shaped block 15 are in contact with the two inner walls of first sealing cavity 10. Then, the operator puts first ring spring 14 on packing 2 of main shaft 1, and fixes packing 2 of main shaft 1 on main shaft 1 through first ring spring 14, thus completing the installation of elastic sealing device of composite air preheater main shaft 1.

[0029] The staff starts the booster air supply device, which blows air out through the air supply pipe 6 and valve 5, filling the counter-current air chamber 4 with clean air under positive pressure. This air counter-currents the hot air blown out from the gap between the main shaft and packing 2, preventing hot air leakage and thus achieving a sealing effect. This prevents the temperature of the gearbox from rising due to hot air. At the same time, the air pressure delivered by the booster air supply device can be adjusted within a certain range. When the unit load increases, the sealing air pressure can be appropriately increased to obtain the best sealing effect.

[0030] When the counter-sealing mechanism cannot completely handle the hot air, the hot air will enter the connecting cavity 9 to weaken the remaining hot air and prevent hot air leakage. Then the remaining hot air enters the first sealing cavity 10. The elastic sealing mechanism is a dynamic and static double sealing structure. The W-shaped block 15 rotates with the main shaft to form a dynamic seal. The rubber sealing block 7 is fixed and will not move with the main shaft 1 to form a static seal. It has self-compensating power supply, which can make the sealing effect better and improve the service life and sealing effect of the main shaft seal. At the same time, the flexible material will not cause wear to the main shaft 1.

[0031] The first annular spring 14 fixes the connecting block 11, making the second sealing cavity 13 the final sealing cavity, and performing multiple seals on the sealing device. This ensures that the hot air blown out from the gap between the main shaft and the packing 2 will not cause the gearbox temperature to rise, thus increasing maintenance costs. It also ensures that the hot air blown out from between the main shaft 1 and the packing 2 can be perfectly handled.

[0032] The above description is merely an embodiment of this utility model, and common knowledge such as specific structures and characteristics in the solution is not described in detail here. It should be noted that those skilled in the art can make several modifications and improvements without departing from the structure of this utility model, and these should also be considered within the protection scope of this utility model. These modifications and improvements will not affect the effectiveness of the implementation of this utility model or its practicality.

Claims

1. A composite air preheater spindle elastic sealing device, characterized in that: Includes a main shaft, on which a rotatable packing is mounted; The main shaft is provided with a counter-seal mechanism and an elastic seal mechanism for sealing the gap between the main shaft and the packing. The counter-seal mechanism is in contact with the packing and is located on the elastic seal mechanism. The counter-sealing mechanism includes a metal sealing chamber, which is fitted onto the main shaft. The metal sealing chamber has a counter-sealing chamber inside it, and the counter-sealing chamber is connected to the gap between the main shaft and the packing through an annular groove.

2. The composite air preheater spindle elastic sealing device according to claim 1, characterized in that: The counter-sealing mechanism also includes two sets of valves, each set of valves is equipped with an air supply pipe, and both sets of air supply pipes are connected to a pressurized air supply device. The metal sealing air chamber is in contact with the packing. One end of the metal sealing air chamber has an annular groove located on the side in contact with the packing. The other end of the metal sealing air chamber is tightly connected to the main shaft.

3. The composite air preheater spindle elastic sealing device according to claim 2, characterized in that: The elastic sealing mechanism includes a rubber sealing block, which is fitted on the main shaft. The rubber sealing block is not in contact with the metal sealing air chamber. An inclined block and a connecting block are fixedly connected to the rubber sealing block. A second sealing cavity is opened in the connecting block, and the opening of the second sealing cavity faces the main shaft. A first sealing cavity is opened on the rubber sealing block, and a first annular spring is fitted on the connecting block.

4. The composite air preheater spindle elastic sealing device according to claim 3, characterized in that: A W-shaped block is provided inside the first sealing cavity. The W-shaped block has a W-shaped cross-section and is in contact with the main shaft. A second annular spring is fitted on the W-shaped block.

5. The composite air preheater spindle elastic sealing device according to claim 4, characterized in that: The packing is provided with a fastening mechanism, which includes a first pressing block and a second pressing block. The first pressing block is located between the metal sealing air chamber and the rubber sealing block. The first pressing block, the inclined block and the metal sealing air chamber form a connecting cavity. The inclined block is located in the connecting cavity, and the second pressing block is located on the rubber sealing block. Several sets of threaded posts are fixedly connected to the packing, and the several sets of threaded posts are all mounted on the first clamping block and the second clamping block; Two sets of nuts are mounted on the threaded column, with the two sets of nuts located below the first clamping block and the second clamping block, respectively.

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