Self-adaptive follow-up moving shaft end sealing structure

Abstract

The utility model discloses a shaft end sealing structure of a self-adaptive follow-up moving shaft. The shaft end sealing structure comprises the moving shaft, an end plate, a sealing seat plate, a sealing limiting plate, a sealing seat, a spiral sleeve, a static ring, a moving ring, a sealing seat gland, a sealing piece gland, a shaft sleeve, an oil seal, a bearing seat sliding plate, a mounted bearing and a sealing seat hoop. Axial gaps exist between the outer side face of the spiral sleeve and the inner side faces of the sealing base plate, the sealing limiting plate and the sealing base to form gap spiral sealing, radial gaps exist between the outer end face of the spiral sleeve and the inner end face of the static ring to form end face sealing, and labyrinth sealing is formed between the static ring and the moving ring. According to the utility model, a plurality of sealing structures are adopted, the centering degree of the moving shaft and the sealing structures is ensured, and shaft jumping and shaft eccentricity are avoided; and the problems of accelerated abrasion of parts in the moving shaft device, too short service life, poor maintainability, product pollution, high use cost and the like caused by material leakage due to sealing failure and deformation of a sealing structure are solved.

Description

Technical Field

[0001] This utility model relates to the field of shaft end sealing technology, and in particular to an adaptive follow-up shaft end sealing structure. Background Technology

[0002] Currently, mechanical seals and packing seals are commonly used for sealing the shaft ends of moving shafts in powder processing equipment. Existing sealing structures require a high degree of stability. Under conditions of shaft runout and eccentricity, these existing seals are subjected to radial forces when the shaft shifts, leading to seal failure and damage. Furthermore, existing seals have poor adaptability to shaft deformation, failing to guarantee consistent sealing performance. Therefore, achieving optimal sealing performance and ensuring usability under conditions of shaft runout and eccentricity is quite challenging. Utility Model Content

[0003] To solve the above-mentioned technical problems, this utility model designs an adaptive follow-up shaft end sealing structure.

[0004] The present invention adopts the following technical solution:

[0005] An adaptive follow-up shaft end sealing structure includes a moving shaft, an end plate, a sealing seat plate, a sealing limiting plate, a sealing seat, a spiral sleeve, a stationary ring, a moving ring, a sealing seat cover, a sealing element cover, a shaft sleeve, an oil seal, a bearing seat slide plate, a seated bearing, and a sealing seat clamp. The moving shaft passes through the end plate. The sealing seat plate is bolted to the end plate and has a certain radial movement range on the end plate. The sealing limiting plate, sealing seat, stationary ring, sealing seat cover, and sealing element cover pass through the moving shaft and are fixedly connected to the sealing seat plate by bolts. The spiral sleeve, moving ring, and shaft sleeve are mounted on the moving shaft. The shaft sleeve is fixedly mounted on the moving shaft by a nut on the moving shaft and axially positions and presses against the moving ring and spiral sleeve. The oil seal passes through the shaft sleeve and is fixed to the sealing seat cover by the sealing element cover. The seated bearing is fixed to the bearing seat slide plate by bolts, and the bearing seat slide plate itself has a certain radial movement range. The end plate and bearing seat slide plate are fixed to the equipment. The sealing seat clamp passes through the sealing seat and is fixedly connected to the seated bearing and sealing seat by bolts.

[0006] An axial gap exists between the outer surface of the spiral sleeve and the sealing seat plate, the sealing limiting plate, and the inner surface of the sealing seat, forming a gap spiral seal. A radial gap exists between the outer end face of the spiral sleeve and the inner end face of the stationary ring, forming an end face seal. A labyrinth seal is formed between the stationary ring and the moving ring.

[0007] Preferably, an end plate sealing gasket is pressed between the sealing seat plate and the end plate.

[0008] Preferably, the sealing seat gland is provided with an air inlet leading to the rotating ring. Introducing air into the air inlet can greatly reduce the residue of material in the seal.

[0009] Preferably, a limiting block is provided on the sealing limiting plate. The limiting block limits the shaft when the shaft eccentricity is small, thereby improving the alignment between the shaft and the sealing structure.

[0010] Preferably, the limiting block is provided with wear leakage holes evenly distributed along the circumference. In the case of excessive shaft eccentricity, the wear leakage holes on one side of the limiting block will be worn and leak material, reminding the user to stop the machine for inspection and replacement of the limiting block in time.

[0011] Preferably, the limiting block on the sealing limiting plate is embedded. It is secured using a sealing seat clamp, eliminating the need for bolt tightening and simplifying replacement.

[0012] The beneficial effects of this utility model are: (1) On the one hand, the sealing structure realizes the combination of gap sealing, labyrinth sealing and spiral labyrinth sealing. There is a gap between the seal and the shaft end, which can adapt to the warping changes of the shaft end; on the other hand, the sealing structure has a certain airtightness. After a certain amount of gas is introduced, it has a certain pressure holding capacity. The pressure inside the sealing structure is greater than the pressure inside the equipment, which achieves the purpose of preventing material leakage inside the equipment and can also isolate the outside air; it can detect the pressure inside the sealing structure in real time, and play the role of timely detection of leakage and immediate plugging of leakage; (2) The sealing seat clamp is fixedly connected to the bearing and the sealing structure by bolts. When the shaft undergoes radial displacement, the sealing structure and the shaft move simultaneously, ensuring the alignment of the sealing structure and the shaft and improving the service life of the seal; (3) When the shaft eccentricity is small, the limiting block limits the shaft and improves the alignment of the shaft and the sealing structure. When the shaft eccentricity is too large, the wear leakage hole on one side of the limiting block will be worn and leaked, reminding the machine to stop for maintenance and replacement of the limiting block in time. Attached Figure Description

[0013] Figure 1 This is a schematic diagram of the structure of this utility model;

[0014] Figure 2 This is a cross-sectional schematic diagram of the structure of this utility model;

[0015] Figure 3 This is a schematic diagram of a sealing and limiting plate in this utility model;

[0016] In the diagram: 1. Moving shaft, 2. End plate, 3. End plate sealing gasket, 4. Sealing seat plate, 5. Sealing limit plate, 51. Limiting block, 52. Wear leakage hole, 6. Sealing seat, 7. Spiral sleeve, 8. Stationary ring, 9. Moving ring, 10. Sealing seat cover, 11. Sealing element cover, 12. Shaft sleeve, 13. Oil seal, 14. Bearing seat slide plate, 15. Bearing with seat, 16. Sealing seat clamp. Detailed Implementation

[0017] The technical solution of this utility model will be further described in detail below through specific embodiments and with reference to the accompanying drawings:

[0018] Example: Figures 1-2 As shown, an adaptive follow-up shaft end sealing structure includes a moving shaft 1, an end plate 2, an end plate sealing gasket 3, a sealing seat plate 4, a sealing limit plate 5, a limit block 51, a wear leakage hole 52, a sealing seat 6, a spiral sleeve 7, a stationary ring 8, a moving ring 9, a sealing seat cover 10, a sealing element cover 11, a shaft sleeve 12, an oil seal 13, a bearing seat slide plate 14, a seated bearing 15, and a sealing seat clamp 16.

[0019] The moving shaft 1 passes through the end plate 2. The sealing seat plate 4 is bolted to the end plate 2 and has a certain radial movement range on the end plate. The end plate sealing gasket 3 is pressed against the end plate 2 by the sealing seat plate 4. The sealing limit plate 5, sealing seat 6, stationary ring 8, sealing seat cover 10, and sealing cover 11 pass through the moving shaft 1 and are fixedly connected to the sealing seat plate 4 by bolts. The screw sleeve 7, moving ring 9, and bushing 12 are installed on the moving shaft 1. The bushing 12 is fixedly installed on the moving shaft 1 by a nut on the moving shaft 1 and axially positions and presses against the moving ring 9 and screw sleeve 7. The oil seal 13 passes through the bushing 12 and is fixed to the sealing seat cover 10 by the sealing cover 11. The mounted bearing 15 is fixed to the bearing seat slide plate 14 by bolts, and the bearing seat slide plate 14 itself has a certain radial movement range. The end plate 2 and the bearing seat slide plate 14 are fixedly connected to other components, that is, fixed to the equipment, and other components are relatively fixed to the end plate 2 and the bearing seat slide plate 14. The sealing seat clamp 16 passes through the sealing seat and is fixedly connected to the seated bearing 15 and the sealing seat 6 by bolts.

[0020] An axial gap exists between the outer surface of the spiral sleeve 7 and the inner surfaces of the sealing seat plate 4, the sealing limiting plate 5, and the sealing seat 6, forming a gap spiral seal. A radial gap exists between the outer end face of the spiral sleeve 7 and the inner end face of the stationary ring 8, forming an end face seal. A labyrinth seal is formed between the stationary ring 8 and the rotating ring 9. The sealing seat cover 10 is provided with an air inlet leading to the rotating ring 9. Introducing air into the air inlet can greatly reduce the residue of material in the above seal.

[0021] like Figure 3 As shown, a limiting block 51 is provided on the sealing limiting plate 5. The limiting block 51 has wear leakage holes 52 evenly distributed along its circumference. When the shaft eccentricity is small, the limiting block 51 limits the shaft, improving the alignment between the shaft and the sealing structure. When the shaft eccentricity is too large, the wear leakage holes 52 on one side of the limiting block 51 will wear out and leak material, prompting timely shutdown for inspection and replacement of the limiting block 51.

[0022] The limiting block 51 on the sealing limiting plate 5 can be set for embedded installation. It is held in place by the sealing seat clamp 16, eliminating the need for bolt tightening and making replacement simpler.

[0023] Before installation, the adaptive follow-up shaft end sealing structure of this invention requires ensuring that the shaft 1 passes through the end plate 2. During installation, the end plate sealing gasket 3 and sealing seat plate 4 are bolted to the end plate 2. The sealing limiting plate 5 and sealing seat 6 are bolted onto the sealing seat plate 4 through the shaft 1. First, the spiral sleeve 7 is installed on the shaft 1. Then, the stationary ring 8 is installed on the sealing seat 6 through the shaft 1. The rotating ring 9 is installed on the shaft 1. The sealing seat cover 10 is bolted onto the sealing seat 6 through the shaft 1. The bushing 12 is installed on the shaft 1 and fixed with threads to position the spiral sleeve 7 and rotating ring 9. The oil seal 13 is installed on the sealing seat cover 11. The mounted bearing 15 is bolted onto the shaft 1 and fitted with the bearing seat slide plate 14. Finally, the sealing seat clamp 16 is bolted onto the sealing seat 6 and fitted with the mounted bearing 15 and sealing seat 6, thus forming the adaptive follow-up shaft end sealing structure.

[0024] During operation, the moving shaft 1 rotates. If material leaks, it must first pass through the axial gap between the sealing seat plate 4, the sealing limit plate 5, the sealing seat 6, and the spiral sleeve 7, which is the first seal for the moving shaft of the equipment.

[0025] The spiral seal between the sealing seat plate 4, the sealing limit plate 5, the sealing seat 6 and the spiral sleeve 7 forms the second seal for the moving shaft of the equipment.

[0026] The gap formed by the spiral sleeve 7 and the stationary ring 8 then forms the third seal for the moving shaft of the equipment.

[0027] The labyrinth seal formed by the sealing teeth between the stationary ring 8 and the moving ring 9 is the fourth seal for the moving shaft of the equipment.

[0028] The seal between the oil seal 13 on the sealing seat cover 10 and the bushing 12 forms the fifth seal for the moving shaft of the equipment.

[0029] Meanwhile, the sealing limit plate 5 and the sealing seat clamp 16 limit the movement of the moving shaft 1, ensuring the alignment of the sealing structure with the shaft and improving the service life of the seal. The wear leakage hole 52 on the limit block 51 can remind you to stop the machine for maintenance in time.

[0030] During maintenance and repair, disassemble the sealing seat clamp 16, seated bearing 15, sealing cover 11, oil seal 13, bushing 12, sealing seat cover 10, rotating ring 9, stationary ring 8, spiral sleeve 7, sealing seat 6, sealing limit plate 5 in sequence, and finally disassemble the sealing seat plate 4.

[0031] The embodiments described above are merely preferred solutions of this utility model and are not intended to limit this utility model in any way. Other variations and modifications are possible without departing from the technical solutions described in the claims.

Claims

1. An adaptive follower shaft end sealing structure, characterized in that, It includes a moving shaft, an end plate, a sealing seat plate, a sealing limit plate, a sealing seat, a spiral sleeve, a stationary ring, a moving ring, a sealing seat cover, a sealing element cover, a bushing, an oil seal, a bearing seat slide plate, a seated bearing, and a sealing seat clamp. The moving shaft passes through the end plate. The sealing seat plate is bolted to the end plate and has a certain radial movement range on the end plate. The sealing limit plate, sealing seat, stationary ring, sealing seat cover, and sealing element cover pass through the moving shaft and are fixedly connected to the sealing seat plate by bolts. The spiral sleeve, moving ring, and bushing are installed on the moving shaft. The bushing is fixedly installed on the moving shaft by a nut on the moving shaft and axially positions and presses the moving ring and spiral sleeve. The oil seal passes through the bushing and is fixed to the sealing seat cover by the sealing element cover. The seated bearing is fixed to the bearing seat slide plate by bolts, and the bearing seat slide plate itself has a certain radial movement range. The end plate and bearing seat slide plate are fixed to the equipment. The sealing seat clamp passes through the sealing seat and is fixedly connected to the seated bearing and sealing seat by bolts. An axial gap exists between the outer surface of the spiral sleeve and the sealing seat plate, the sealing limiting plate, and the inner surface of the sealing seat, forming a gap spiral seal. A radial gap exists between the outer end face of the spiral sleeve and the inner end face of the stationary ring, forming an end face seal. A labyrinth seal is formed between the stationary ring and the moving ring.

2. The adaptive follow-up shaft end sealing structure according to claim 1, characterized in that, An end plate sealing gasket is pressed between the sealing seat plate and the end plate.

3. The adaptive follow-up shaft end sealing structure according to claim 1, characterized in that, The sealing seat cover is provided with an air supply hole leading to the moving ring.

4. The adaptive follow-up shaft end sealing structure according to claim 1, characterized in that, A limiting block is provided on the sealing limiting plate.

5. The adaptive follow-up shaft end sealing structure according to claim 4, characterized in that, The limiting block is provided with wear leakage holes evenly distributed along the circumference.

6. The adaptive follow-up shaft end sealing structure according to claim 4, characterized in that, The limiting block on the sealing limiting plate is embedded.

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