A multi-stage multi-face sealing mechanism

Abstract

The utility model provides a kind of multistage multiend surface sealing mechanism, static ring seat is empty sleeve on rotating shaft and is adhered to the side wall of equipment shell fixed, static ring is empty sleeve on rotating shaft and is installed fixed in the opening slot of static ring seat by interference fit, static ring includes the static connecting ring being arranged along radial direction and the multiple outer static sealing ring being arranged along axial direction, drive ring tight sleeve is fixed on rotating shaft, outer dynamic ring tight sleeve is fixed on drive ring, outer dynamic ring includes the outer dynamic connecting ring being arranged along radial direction and the multiple outer dynamic sealing ring being arranged along axial direction, all between outer dynamic sealing ring and outer static sealing ring interlaced and inserted to form outer labyrinth seal cavity containing multiple C-shaped turns, outer labyrinth seal cavity is filled with sealing filler in C-shaped turn place. The sealing performance of the sealing mechanism is good, and the sealing mechanism is easy to replace, which can effectively reduce the cost.

Description

Technical Field

[0001] This utility model relates to the field of mechanical seal technology, specifically to a multi-stage, multi-end-face sealing mechanism. Background Technology

[0002] Mechanical seals are devices used to prevent fluid leakage within equipment. Contact seals and labyrinth seals are two main types of mechanical seals. A labyrinth seal consists of several sequentially arranged annular sealing teeth around a rotating shaft. These teeth form a series of flow-blocking gaps and expansion cavities. The sealed medium experiences a throttling effect as it passes through the tortuous labyrinth gaps, thus preventing leakage. However, in applications requiring high sealing performance (such as steam turbines), end-face contact seals are typically used to seal the rotating shaft. End-face contact seals have a very low leakage rate, ensuring zero leakage of the fluid within the sealed cavity and preventing external fluids from entering. For applications with high sealing performance requirements, it is necessary to provide a high-performance end-face sealing mechanism. Furthermore, reducing the difficulty of replacing the end-face sealing mechanism can significantly reduce labor costs. Summary of the Invention

[0003] This invention provides a multi-stage, multi-end-face sealing mechanism with good sealing performance and easy replacement, which can effectively reduce costs.

[0004] The technical solution adopted to achieve the above-mentioned objectives of this utility model is as follows:

[0005] A multi-stage, multi-end-face sealing mechanism is installed between a rotating shaft and a device housing to seal the gap between them. The device housing is fitted onto the rotating shaft, and the two rotate relative to each other. The multi-stage, multi-end-face sealing mechanism includes:

[0006] The stationary ring seat is ring-shaped as a whole. The stationary ring seat is loosely fitted on the rotating shaft and fixed against the side wall of the equipment housing. An opening groove is provided on the side wall of the stationary ring seat away from the equipment housing.

[0007] A stationary ring is loosely fitted on a rotating shaft and fixed in the opening groove of a stationary ring seat by an interference fit. The stationary ring includes a stationary connecting ring arranged radially and a plurality of external stationary sealing rings arranged axially. The external stationary sealing rings are distributed and connected to the side of the stationary connecting ring away from the equipment housing.

[0008] The drive ring is tightly fitted and fixed to the outer circumference of the rotating shaft;

[0009] An outer moving ring is tightly fitted and fixed to the outer circumferential surface of the drive ring and located on the side of the stationary ring away from the equipment housing. The outer moving ring includes an outer moving connecting ring arranged radially and a plurality of outer moving sealing rings arranged axially. The outer moving sealing rings are distributed and connected to the side of the outer moving connecting ring close to the equipment housing.

[0010] All the external dynamic sealing rings and external static sealing rings are interwoven to form an external labyrinth sealing cavity with multiple C-shaped bends. The C-shaped bends in the external labyrinth sealing cavity are filled with and compressed sealing packing.

[0011] The stationary connecting ring is connected to a plurality of axially arranged inner stationary sealing rings on the side of the stationary ring closest to the equipment housing. An inner moving ring is tightly fitted and fixed on the outer circumference of the drive ring on the side of the stationary ring closest to the equipment housing. The inner moving ring includes an inner moving connecting ring arranged radially and a plurality of inner moving sealing rings arranged axially. The inner moving sealing rings are distributed and connected to the side of the inner moving connecting ring away from the equipment housing. All the inner moving sealing rings and the inner stationary sealing rings are interlaced to form an inner labyrinth sealing cavity containing a plurality of C-shaped bends. The inner labyrinth sealing cavity is filled with sealing packing at the C-shaped bends.

[0012] A locking ring is connected to the outer circular surface of the drive ring, located outside the outer moving ring. The locking ring has an open structure and is locked at the opening, thereby pressing the drive ring onto the rotating shaft.

[0013] The side of the locking ring is in contact with the outer moving ring. The locking ring is provided with mounting holes along the axial direction. Each mounting hole is equipped with a compression spring arranged along the axial direction. A washer and a set screw are installed on the outside of the compression spring. The set screw is pressed against the washer and the compression spring, so that the locking ring is pressed against the side of the outer moving ring.

[0014] The outer circular surface of the stationary ring is provided with a first groove that is generally annular. A first sealing ring is installed in the first groove and the first sealing ring protrudes from the first groove. The first sealing ring is pressed against the inner wall of the stationary ring seat.

[0015] The inner circular surface of the drive ring is provided with a second groove that is generally annular. A second sealing ring is installed in the second groove and the second sealing ring protrudes from the second groove. When the drive ring is fixed on the rotating shaft, the second sealing ring is pressed against the outer circular surface of the rotating shaft.

[0016] The inner circular surface of the outer moving ring is provided with a third groove that is annular in shape. A third sealing ring is installed in the third groove and protrudes from the third groove. The third sealing ring is pressed against the drive shaft.

[0017] The inner circular surface of the inner moving ring is provided with a fourth groove that is annular in shape. A fourth sealing ring is installed in the fourth groove and protrudes from the fourth groove. The fourth sealing ring is pressed against the drive shaft.

[0018] The stationary ring seat is fixedly connected to the equipment housing by locking bolts; the drive ring is pressed against the rotating shaft by set screws; a drive pin is connected between the outer moving ring and the drive ring; the stationary connecting ring is in contact with the side wall of the stationary ring seat, and an anti-rotation pin is connected between the stationary connecting ring and the stationary ring seat.

[0019] A drive pin connects the inner moving ring and the drive ring.

[0020] A groove is provided on the outer circular surface of the stationary ring, and an anti-rotation pin is installed on the stationary ring seat, with the anti-rotation pin pressed tightly against the groove.

[0021] An oil baffle ring is connected to the outer circumference of the drive shaft near the end of the equipment housing.

[0022] Compared with the prior art, the multi-stage, multi-end-face sealing mechanism provided by this utility model has the following advantages:

[0023] 1. In the multi-stage, multi-face sealing mechanism provided by this utility model, a tortuous labyrinth sealing cavity is formed between the stationary ring and the moving ring. At the same time, the sealing filler filled in the labyrinth sealing cavity performs multi-face contact sealing, resulting in good sealing performance.

[0024] 2. In this utility model, the core sealing mechanism formed by the entire rotating ring and stationary ring is installed between the equipment housing and the rotating shaft through the stationary ring seat and the drive ring, which facilitates the replacement of the core sealing mechanism formed by the rotating ring and stationary ring; at the same time, compressible sealing rings are set on the mounting surfaces of the stationary ring and the rotating ring, further reducing the difficulty of replacement and lowering labor costs.

[0025] 3. In this utility model, the driving ring is locked radially by a locking ring, and the moving ring and stationary ring are locked axially by the locking ring, ensuring the stability and reliability of the entire sealing structure. Attached Figure Description

[0026] Figure 1 This is a schematic diagram of the overall structure of the multi-stage, multi-end-face sealing mechanism provided in Example 1;

[0027] Figure 2 This is a schematic diagram of the overall structure of the multi-stage, multi-end-face sealing mechanism provided in Example 2;

[0028] In the diagram: 1-Rotating shaft, 2-Equipment housing, 3-Static ring seat, 4-Static ring, 401-Static connecting ring, 402-Outer static sealing ring, 403-Inner static sealing ring, 5-Drive ring, 6-Outer moving ring, 601-Outer moving connecting ring, 602-Outer moving sealing ring, 7-Locking ring, 8-Locking bolt, 9-First sealing ring, 10-Anti-rotation pin, 11-Setting screw, 12-Second sealing ring, 13-Drive pin, 14-Third sealing ring, 15-Sealing packing, 16-Connecting bolt, 17-Compression spring, 18-Gasket, 19-Inner moving ring, 20-Fourth sealing ring, 21-Oil baffle ring, 22-Slide groove. Detailed Implementation

[0029] The present invention will now be described in detail with reference to the accompanying drawings.

[0030] Example 1

[0031] The structure of the multi-stage, multi-end-face sealing mechanism provided in this embodiment is as follows: Figure 1 As shown, the multi-stage, multi-face sealing mechanism is installed between the rotating shaft 1 and the equipment housing 2 to seal the gap between them. The equipment housing is fitted onto the rotating shaft, and the two rotate relative to each other. The multi-stage, multi-face sealing mechanism includes a stationary ring seat 3, a stationary ring 4, a drive ring 5, an outer moving ring 6, and a locking ring 7.

[0032] The stationary ring seat is ring-shaped and is loosely fitted on the rotating shaft and fixed against the side wall of the equipment housing. Specifically, the stationary ring seat is fixedly connected to the equipment housing by locking bolts 8, and an opening groove is provided on the side wall of the stationary ring seat away from the equipment housing.

[0033] The stationary ring is loosely fitted onto the rotating shaft and fixed in the opening groove of the stationary ring seat by an interference fit. Specifically, a first annular groove is provided on the outer circumference of the stationary ring, and a first sealing ring 9 is installed in the first groove, protruding from the first groove. The first sealing ring is pressed against the inner wall of the stationary ring seat. Preferably, an anti-rotation pin 10 connects the stationary ring and the stationary ring seat. In this embodiment, the stationary ring includes a radially arranged stationary connecting ring 401 and a plurality of axially arranged outer stationary sealing rings 402, which are distributed and connected to the side of the stationary connecting ring away from the equipment housing. Specifically, one of the outer stationary sealing rings is connected to the outer circumference of the stationary connecting ring and fixed in cooperation with the stationary ring seat. In this embodiment, the stationary connecting ring abuts against the side wall of the stationary ring seat, and the anti-rotation pin connects the stationary connecting ring and the stationary ring seat.

[0034] The drive ring is fixed to the outer circumference of the rotating shaft by an interference fit. Specifically, the drive ring is pressed against the rotating shaft by a set screw 11. Furthermore, a second annular groove is provided on the inner circumference of the drive ring. A second sealing ring 12 is installed in the second groove and protrudes from the second groove. When the drive ring is fixed to the rotating shaft, the second sealing ring is pressed against the outer circumference of the rotating shaft.

[0035] The outer moving ring is tightly fitted onto the outer circumference of the drive ring and located on the side of the stationary ring away from the equipment housing. Specifically, a drive pin 13 connects the outer moving ring and the drive ring. A third annular groove is provided on the inner circumference of the outer moving ring. A third sealing ring 14 is installed in the third groove and protrudes from the third groove, pressing against the drive shaft. The outer moving ring includes an outer moving connecting ring 601 arranged radially and multiple outer moving sealing rings 602 arranged axially. The outer moving sealing rings are distributed and connected to the side of the outer moving connecting ring closest to the equipment housing. All the outer moving sealing rings and the outer stationary sealing ring are interlaced to form an outer labyrinth sealing cavity containing multiple C-shaped bends. Sealing filler 15 is filled and pressed into each C-shaped bend in the outer labyrinth sealing cavity.

[0036] The locking ring is mounted on the outer circumference of the drive ring and located outside the outer moving ring. The locking ring has an open structure, and it locks at the opening, thereby pressing the drive ring against the rotating shaft. Specifically, the locking ring has an ear plate at the opening, and bolt holes are provided on the ear plate. Connecting bolts 16 are installed in the bolt holes to connect and lock the locking ring. The side of the locking ring is in contact with the outer moving ring. The locking ring has axially arranged mounting holes, and compression springs 17 are installed in each mounting hole. Washers 18 and set screws are installed on the outside of the compression springs. The set screws press against the washers and tighten the compression springs, so that the locking ring is pressed against the side of the outer moving ring.

[0037] Example 2

[0038] The multi-stage, multi-end-face sealing mechanism provided in this embodiment adds some structures to the structure of embodiment 1, such as... Figure 2 As shown. In this embodiment, multiple axially arranged inner static sealing rings 403 are distributed and connected to the side of the static connecting ring near the equipment housing. An inner moving ring 19 is tightly fitted and fixed on the outer circumference of the drive ring on the side of the static ring near the equipment housing. Specifically, a drive pin connects the inner moving ring and the drive ring. Further, a fourth annular groove is provided on the inner circumference of the inner moving ring. A fourth sealing ring 20 is installed in the fourth groove and protrudes from the fourth groove. The fourth sealing ring is pressed against the drive shaft. The inner moving ring includes an inner moving connecting ring arranged radially and multiple inner moving sealing rings arranged axially. The inner moving sealing rings are distributed and connected to the side of the inner moving connecting ring away from the equipment housing. All the inner moving sealing rings and the inner static sealing rings are interlaced to form an inner labyrinth sealing cavity containing multiple C-shaped bends. Sealing packing is filled and pressed into the C-shaped bends of the inner labyrinth sealing cavity. In this embodiment, an oil baffle ring 21 is connected to the outer circumference of the drive shaft near the equipment housing.

[0039] In addition to the aforementioned structural additions, this embodiment differs slightly from Embodiment 1. For instance, the position of the anti-rotation pin connecting the stationary ring and the stationary ring seat is different. In this embodiment, a groove 22 is provided on the outer circumference of the stationary ring, and an anti-rotation pin is installed on the stationary ring seat, with the anti-rotation pin tightly pressed against the groove. Furthermore, in this embodiment, two sets of both the first and second sealing rings are provided.

Claims

1. A multi-stage, multi-face sealing mechanism, installed between a rotating shaft and a device housing to seal the gap between them, wherein the device housing is fitted onto the rotating shaft and the two rotate relative to each other, characterized in that: The multi-stage, multi-end-face sealing mechanism includes: The stationary ring seat is ring-shaped as a whole. The stationary ring seat is loosely fitted on the rotating shaft and fixed against the side wall of the equipment housing. An opening groove is provided on the side wall of the stationary ring seat away from the equipment housing. A stationary ring is loosely fitted on a rotating shaft and fixed in the opening groove of a stationary ring seat by an interference fit. The stationary ring includes a stationary connecting ring arranged radially and a plurality of external stationary sealing rings arranged axially. The external stationary sealing rings are distributed and connected to the side of the stationary connecting ring away from the equipment housing. The drive ring is tightly fitted and fixed to the outer circumference of the rotating shaft; An outer moving ring is tightly fitted and fixed to the outer circumferential surface of the drive ring and located on the side of the stationary ring away from the equipment housing. The outer moving ring includes an outer moving connecting ring arranged radially and a plurality of outer moving sealing rings arranged axially. The outer moving sealing rings are distributed and connected to the side of the outer moving connecting ring close to the equipment housing. All the external dynamic sealing rings and external static sealing rings are interwoven to form an external labyrinth sealing cavity with multiple C-shaped bends. The C-shaped bends in the external labyrinth sealing cavity are filled with and compressed sealing packing.

2. The multi-stage, multi-end-face sealing mechanism according to claim 1, characterized in that: The stationary connecting ring is connected to a plurality of axially arranged inner stationary sealing rings on the side of the stationary ring closest to the equipment housing. An inner moving ring is tightly fitted and fixed on the outer circumference of the drive ring on the side of the stationary ring closest to the equipment housing. The inner moving ring includes an inner moving connecting ring arranged radially and a plurality of inner moving sealing rings arranged axially. The inner moving sealing rings are distributed and connected to the side of the inner moving connecting ring away from the equipment housing. All the inner moving sealing rings and the inner stationary sealing rings are interlaced to form an inner labyrinth sealing cavity containing a plurality of C-shaped bends. The inner labyrinth sealing cavity is filled with sealing packing at the C-shaped bends.

3. The multi-stage, multi-end-face sealing mechanism according to claim 1 or 2, characterized in that: A locking ring is connected to the outer circular surface of the drive ring, located outside the outer moving ring. The locking ring has an open structure and is locked at the opening, thereby pressing the drive ring onto the rotating shaft.

4. The multi-stage, multi-end-face sealing mechanism according to claim 3, characterized in that: The side of the locking ring is in contact with the outer moving ring. The locking ring is provided with mounting holes along the axial direction. Each mounting hole is equipped with a compression spring arranged along the axial direction. A washer and a set screw are installed on the outside of the compression spring. The set screw is pressed against the washer and the compression spring, so that the locking ring is pressed against the side of the outer moving ring.

5. The multi-stage, multi-end-face sealing mechanism according to claim 1, characterized in that: The outer circular surface of the stationary ring is provided with a first groove that is generally annular. A first sealing ring is installed in the first groove and the first sealing ring protrudes from the first groove. The first sealing ring is pressed against the inner wall of the stationary ring seat. The inner circular surface of the drive ring is provided with a second groove that is generally annular. A second sealing ring is installed in the second groove and the second sealing ring protrudes from the second groove. When the drive ring is fixed on the rotating shaft, the second sealing ring is pressed against the outer circular surface of the rotating shaft. The inner circular surface of the outer moving ring is provided with a third groove that is annular in shape. A third sealing ring is installed in the third groove and protrudes from the third groove. The third sealing ring is pressed against the drive shaft.

6. The multi-stage, multi-end-face sealing mechanism according to claim 2, characterized in that: The inner circular surface of the inner moving ring is provided with a fourth groove that is annular in shape. A fourth sealing ring is installed in the fourth groove and protrudes from the fourth groove. The fourth sealing ring is pressed against the drive shaft.

7. The multi-stage, multi-end-face sealing mechanism according to claim 1, characterized in that: The stationary ring seat is fixedly connected to the equipment housing by locking bolts; the drive ring is pressed against the rotating shaft by set screws; a drive pin is connected between the outer moving ring and the drive ring; the stationary connecting ring is in contact with the side wall of the stationary ring seat, and an anti-rotation pin is connected between the stationary connecting ring and the stationary ring seat.

8. The multi-stage, multi-end-face sealing mechanism according to claim 2, characterized in that: A drive pin connects the inner moving ring and the drive ring.

9. The multi-stage, multi-end-face sealing mechanism according to claim 2, characterized in that: A groove is provided on the outer circular surface of the stationary ring, and an anti-rotation pin is installed on the stationary ring seat, with the anti-rotation pin pressed tightly against the groove.

10. The multi-stage, multi-end-face sealing mechanism according to claim 1, characterized in that: An oil baffle ring is connected to the outer circumference of the drive ring near the end of the equipment housing.

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