Mechanical sealing device

Abstract

The utility model discloses a mechanical sealing device which comprises a rotating shaft positioning sleeve, a rotating shaft is sleeved with the rotating shaft positioning sleeve, and a first sealing ring is arranged between the rotating shaft positioning sleeve and the rotating shaft in a clamped mode. The outer side of the rotating shaft positioning sleeve is sleeved with an elastic jacking piece, a static sealing ring and a rotating sealing ring; the static sealing ring and the rotary sealing ring abut against each other for sealing. A second sealing ring is clamped between the rotating sealing ring and the rotating shaft positioning sleeve; a secondary sealing ring and a mechanical sealing main body are sequentially arranged on the outer side of the static sealing ring in a sleeving manner, a third sealing ring is clamped between the secondary sealing ring and the static sealing ring, and a fourth sealing ring is clamped between the mechanical sealing main body and the secondary sealing ring; the mechanical seal body is provided with a lubricant inlet penetrating from outside to inside, and the lubricant inlet is communicated with the abutting part between the static seal ring and the rotary seal ring. According to the scheme, it is guaranteed that the structure always abuts against and is sealed when rotating, and the better sealing effect is achieved.

Description

Technical Field

[0001] The utility model belongs to the technical field of sealing structures, and particularly relates to a mechanical seal device. Background Art

[0002] Currently, in production equipment such as polyimide film, a rotary mixer is needed to mix materials. The rotary mixer drives the stirring component to rotate through a rotating shaft to achieve the mixing effect. Therefore, it is required that the rotating shaft has good concentricity, sealing performance, and operation stability, especially for electronic-grade films with high-quality requirements. Therefore, a mechanical seal needs to be set up to ensure the seal at the end of the rotating shaft while the rotating shaft rotates; in addition, it is also necessary to ensure that the mechanical seal device and the rotating shaft have good concentricity to ensure the stable operation of the rotary mixer. The existing mechanical seal structures cannot meet the sealing and stability requirements of the above high-quality processes. Summary of the Utility Model

[0003] The technical problem to be solved by the utility model is: to provide a mechanical seal device, which solves the problems of poor sealing effect and low concentricity of the mechanical seal device in the prior art, is particularly suitable for rotary mixers with high-quality processes, further ensures the sealing effect, ensures the concentricity of the structure, and improves the operation stability of the equipment.

[0004] According to the technical solution of the utility model, the utility model provides a mechanical seal device, which includes a rotating shaft positioning sleeve sleeved on the rotating shaft, and a first sealing ring is clamped between the rotating shaft positioning sleeve and the rotating shaft; an elastic tightening member, a stationary sealing ring, and a rotating sealing ring are sleeved outside the rotating shaft positioning sleeve; the stationary sealing ring and the rotating sealing ring are in contact and sealed with each other; the rotating sealing ring is clamped with the rotating shaft positioning sleeve and a second sealing ring is clamped between them; a secondary sealing ring and a mechanical seal main body are sequentially sleeved outside the stationary sealing ring, a third sealing ring is clamped between the secondary sealing ring and the stationary sealing ring, and a fourth sealing ring is clamped between the mechanical seal main body and the secondary sealing ring; the mechanical seal main body has a lubricant inlet penetrating from outside to inside, and the lubricant inlet is communicated with the part where the stationary sealing ring and the rotating sealing ring are in contact with each other.

[0005] Further, the elastic tightening member includes a spring anti-rotation retaining ring sleeved outside the rotating shaft positioning sleeve, the spring anti-rotation retaining ring is clamped with the mechanical seal main body, the spring anti-rotation retaining ring is connected with a spring seat ring through a compression spring, the spring seat ring is sleeved outside the rotating shaft positioning sleeve, and the spring seat ring is in contact with or connected to the stationary sealing ring;

[0006] And / or, the elastic pressing member further includes a spring guide member, which is columnar and is positioned with its length direction parallel to the axial direction of the rotating shaft positioning sleeve; both the spring guide member and the compression spring are provided in a plurality and are distributed circumferentially along the rotating shaft positioning sleeve, and the compression spring is sleeved outside the spring guide member.

[0007] Furthermore, a centering lock ring is sleeved outside the rotating shaft positioning sleeve. Through top screw mounting holes are formed in the centering lock ring and the rotating shaft positioning sleeve, and positioning top screws are installed. A plurality of positioning top screws are distributed circumferentially.

[0008] Furthermore, a centering clamp is provided at one end of the mechanical seal main body; through screw mounting holes are formed in the centering clamp and the centering lock ring, and centering screws are installed. The centering lock ring abuts against the centering clamp.

[0009] Furthermore, a limiting groove is provided on the mechanical seal main body. The limiting groove is annular and concentric with the rotating shaft positioning sleeve, and the centering clamp is detachably clamped with the limiting groove.

[0010] Furthermore, the centering clamp is located outside the centering lock ring, and there are more than three centering clamps distributed circumferentially; and / or, the centering clamp and the centering lock ring are located at one end of the mechanical seal main body away from the rotating sealing ring.

[0011] Furthermore, a limiting edge extending inward is provided at one end of the centering lock ring away from the mechanical seal main body, and the limiting edge is clamped with the rotating shaft positioning sleeve.

[0012] Furthermore, the positioning top screw includes a sleeve positioning top screw and a shaft positioning top screw; the inner end of the shaft positioning top screw penetrates through the rotating shaft positioning sleeve and abuts against the rotating shaft; the inner end of the sleeve positioning top screw is a positioning end, and the corresponding top screw mounting hole of the rotating shaft positioning sleeve is a positioning hole, and the positioning end is connected with the positioning hole in a matching manner.

[0013] Furthermore, there are a total of nine positioning top screws, which are divided into three groups evenly distributed circumferentially. Each group includes one sleeve positioning top screw and two shaft positioning top screws located on both sides of the sleeve positioning top screw.

[0014] Furthermore, the stationary sealing ring, the rotating sealing ring, the first sealing ring, the second sealing ring, the third sealing ring, and the fourth sealing ring are all corrosion-resistant sealing rings; and / or, the lubricant inlet is connected with an external device for providing lubricant adapted to the process.

[0015] Compared with the prior art, the beneficial technical effects of the present utility model are as follows:

[0016] 1. The mechanical seal device of the present utility model is provided with a stationary sealing ring and a rotating sealing ring that are in contact and sealed within the mechanical seal main body, and is also provided with a secondary sealing ring to form two levels of sealing, namely, an inner and outer level and a front and rear level. Moreover, a total of four sealing rings (O-ring seals) are provided, and there is also a lubricant inlet to supply lubricant between the stationary sealing ring and the rotating sealing ring, ensuring that they are always in contact and sealed while rotating relative to each other. Thus, this solution has a better sealing effect.

[0017] 2. The mechanical seal device of the present utility model is also provided with a centering clamp, a centering lock ring, etc. for centering, which can better ensure the concentricity of the overall structure and facilitate the assembly of the structure. Therefore, when the rotating shaft rotates, the mechanical seal device can maintain stability, and it also helps to ensure the sealing and stability effects of the equipment during the entire operation process. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 is a schematic cross-sectional structure view of a mechanical seal device according to an embodiment of the present utility model.

[0019] Figure 2 is Figure 1 a schematic perspective structure view of the axial direction of the shown mechanical seal device.

[0020] Figure 3 is Figure 1 a schematic three-dimensional structure view of the shown mechanical seal device.

[0021] Figure 4 is Figure 1 a schematic cross-sectional structure view of the centering clamp, centering lock ring and related components in the shown mechanical seal device.

[0022] Figure 5 is a schematic structure view of a rotating mixer with a mechanical seal device according to an embodiment of the present utility model.

[0023] Explanation of the reference numerals in the drawings:

[0024] 1. Rotating shaft positioning sleeve; 2. First sealing ring; 3. Spring anti-rotation retaining ring; 4. Compression spring; 5. Spring seat ring; 6. Stationary sealing ring; 7. Rotating sealing ring; 8. Second sealing ring; 9. Secondary sealing ring; 10. Mechanical seal main body; 11. Third sealing ring; 12. Fourth sealing ring; 13. Lubricant inlet; 14. Centering clamp; 15. Centering lock ring; 16. Centering screw; 17. Positioning set screw; 18. Limiting groove; 19. Limiting edge; 20. Sleeve positioning set screw; 21. Shaft positioning set screw; 22. Spring guide; 100. Mechanical seal device; 200. Rotating shaft; 300. Rotating mixer. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0025] The present utility model provides a mechanical seal device, which solves the problems of poor sealing effect and low concentricity of the mechanical seal device in the prior art, and is particularly applicable to a rotary mixer with high-quality processes, so as to further ensure the sealing effect, ensure the concentricity of the structure, and improve the operation stability of the equipment.

[0026] Please refer to Figure 1 , a mechanical seal device according to an embodiment of the present utility model, includes a rotating shaft positioning sleeve 1, the rotating shaft positioning sleeve 1 is sleeved on the rotating shaft, and a first sealing ring 2 is clamped between the rotating shaft positioning sleeve 1 and the rotating shaft to seal between the two. An elastic pressing member, a stationary sealing ring 6 and a rotating sealing ring 7 are sequentially sleeved on the outside of the rotating shaft positioning sleeve 1 along the axial direction. Under the action of the elastic pressing member, the stationary sealing ring 6 and the rotating sealing ring 7 are in contact and sealed with each other. The rotating sealing ring 7 is clamped with the rotating shaft positioning sleeve 1 and a second sealing ring 8 is clamped between them to achieve sealing; for example, the rotating shaft positioning sleeve 1 has a convex ring at one end (right end), the rotating sealing ring 7 is clamped outside the convex ring in a matching manner, and sealing ring grooves are respectively provided on the inner and outer sides of the convex ring to arrange the first sealing ring 2 and the second sealing ring 8. A secondary sealing ring 9 and a mechanical seal main body 10 are sequentially sleeved on the outside of the stationary sealing ring 6. A sealing ring groove is provided between the secondary sealing ring 9 and the stationary sealing ring 6 and a third sealing ring 11 is clamped. A sealing ring groove is provided between the mechanical seal main body 10 and the secondary sealing ring 9 and a fourth sealing ring 12 is clamped. The first sealing ring 2, the second sealing ring 8, the third sealing ring 11 and the fourth sealing ring 12 are all O-shaped sealing rings. Thus, complete sealing is achieved axially. Taking Figure 1 as an example, the material cannot flow from the right end of the rotating shaft to the left end of the rotating shaft. The mechanical seal main body 10 has a lubricant inlet 13 penetrating from the outside to the inside, and the lubricant inlet 13 is communicated with the part where the stationary sealing ring 6 and the rotating sealing ring 7 are in contact, so as to be able to provide lubricant to reduce the friction force between the stationary sealing ring 6 and the rotating sealing ring 7, make the friction between the two smooth, and maintain the pressing seal.

[0027] More specifically, the elastic pressing member includes a spring anti-rotation retaining ring 3 sleeved on the outside of the rotating shaft positioning sleeve 1. The mechanical seal main body 10 extends to the end of the spring anti-rotation retaining ring 3 and has a baffle. The spring anti-rotation retaining ring 3 is clamped with the mechanical seal main body 10 to limit the spring anti-rotation retaining ring 3. The spring anti-rotation retaining ring 3 is connected with a spring seat ring 5 through a compression spring 4. The spring seat ring 5 is sleeved on the outside of the rotating shaft positioning sleeve 1, and the spring seat ring 5 is in contact with or connected to the stationary sealing ring 6. Thus, the required acting force is provided to the stationary sealing ring 6.

[0028] Please also refer to Figure 2, preferably, the elastic pressing member further includes a spring guide member 22 connected to the spring anti-rotation retaining ring 3 and / or the mechanical seal main body 10. The spring guide member 22 is columnar and its length direction is parallel to the axial direction of the rotating shaft positioning sleeve 1. Both the spring guide member 22 and the compression spring 4 are provided in a plurality circumferentially distributed along the rotating shaft positioning sleeve 1, and the compression spring 4 is sleeved outside the spring guide member 22. Thus, the structure with multiple springs and guiding columns ensures that the static sealing ring 6 is basically uniformly pressured axially at various circumferential positions.

[0029] Please refer to Figures 1 to 4 , more preferably, a centering lock ring 15 is further sleeved outside the rotating shaft positioning sleeve 1, and a centering clamp 14 (the centering clamp 14 is preferably detachable) is provided at one end of the mechanical seal main body 10. Through holes for screw installation are formed in the centering clamp 14 and the centering lock ring 15 and a centering screw 16 is installed. Under the action of the centering screw 16, the centering lock ring 15 abuts against the centering clamp 14, so that by designing the structure to ensure the position of the centering clamp 14, the centering lock ring 15 can be fixed at the required position after installation, that is, the overall concentric (axis coinciding) position. Through holes for set screw installation are formed in the centering lock ring 15 and the rotating shaft positioning sleeve 1 and a positioning set screw 17 is installed. A plurality of positioning set screws 17 are circumferentially distributed, and the positioning set screws 17 extend inwards to further fix the rotating shaft and the mechanical seal device circumferentially.

[0030] More specifically, a limiting groove 18 is provided on the mechanical seal main body 10. The limiting groove 18 is annular and concentric with the rotating shaft positioning sleeve 1. The centering clamp 14 is detachably clamped with the limiting groove 18. For example, the centering clamp 14 is block-shaped and located outside the centering lock ring 15. The centering clamp 14 and the centering lock ring 15 are located at one end of the mechanical seal main body 10 away from the rotating sealing ring 7. The inner side surface of the centering clamp 14 is clamped with the centering lock ring 15, and the end surface of the centering clamp 14 has a protrusion that is clamped with the limiting groove 18. The protrusion is further preferably beveled on the outside to be more convenient for positioning, installation and disassembly. The centering clamp 14 is three or more (including three) circumferentially distributed, preferably three circumferentially evenly distributed, and the position of the centering lock ring 15 is determined by the method of three-point circle determination. A limiting edge 19 extending inwards is provided at one end of the centering lock ring 15 away from the mechanical seal main body 10. The limiting edge 19 is clamped with the rotating shaft positioning sleeve 1 to provide further limitation and facilitate installation in place.

[0031] Further preferably, the positioning set screw 17 includes a sleeve positioning set screw 20 and a shaft positioning set screw 21. Among them, the sleeve positioning set screw 20 is used to further position the position of the rotating shaft positioning sleeve 1 in the axial direction of the rotating shaft. For example, the sleeve positioning set screw 20 abuts against or jams the rotating shaft positioning sleeve 1, but does not squeeze the rotating shaft inward; more specifically, for example, as can be seen from the figure, the sleeve positioning set screw 20 is smaller, and the corresponding set screw mounting hole is smaller; the inner end of the sleeve positioning set screw 20 is a positioning end (such as a smooth column without threads), and the corresponding set screw mounting hole of the rotating shaft positioning sleeve 1 is a positioning hole, and the positioning end is connected to the positioning hole in a matching manner, such as insertion (the shapes and dimensions of the two are basically the same and there is basically no gap between them). However, as can be seen from the figure, the shaft positioning set screw 21 and the corresponding set screw mounting hole are larger; the inner end of the shaft positioning set screw 21 penetrates through the rotating shaft positioning sleeve 1 and abuts against the rotating shaft, and uses friction or forms a snap connection with the rotating shaft to further fix the centering lock ring 15, the rotating shaft positioning sleeve 1 and the rotating shaft together. In a preferred embodiment, as Figure 4 shown, there are a total of nine positioning set screws 17, which are divided into three groups evenly distributed in the circumferential direction. Each group includes a sleeve positioning set screw 20 and two shaft positioning set screws 21 located on both sides of the sleeve positioning set screw 20; and, the connection line of the two shaft positioning set screws 21 opposite to each other on both sides of the rotating shaft 200 passes through the axis of the rotating shaft 200, and the force and positioning of the rotating shaft 200 are more stable.

[0032] Please refer to Figure 5 , taking a rotary mixer as an example, when the present invention is applied, the mechanical seal device 100 and the rotary mixer 300 are fixedly and sealedly connected, for example, through an O-ring and bolts, and the rotating shaft 200 is arranged at the axis position of the mechanical seal device 100 and the rotary mixer 300. Taking Figure 5 the shown orientation as an example, the material is input from the feed inlet on the upper side of the rotary mixer 300. The lower part of the rotating shaft has a stirring component. As the rotating shaft rotates, the material is stirred and mixed below; under the action of the mechanical seal device 100 above, the material cannot flow into the upper area. For example, a driving structure is arranged in the upper area, so as to ensure that the environment of the driving structure is not polluted and can operate stably and normally for a long time.

[0033] As a further supplementary explanation, the stationary sealing ring 6 and the rotating sealing ring 7 are preferably corrosion-resistant sealing rings, that is, the material is a corrosion-resistant material, preferably perfluoroether, which has excellent tolerance in corrosive environments, and the operating temperature range is -70°C to 250°C, which can be preferably used for high-performance sealing. The remaining sealing rings (at least including the first sealing ring 2, the second sealing ring 8, the third sealing ring 11, and the fourth sealing ring 12) are also preferably corrosion-resistant sealing rings, using corrosion-resistant materials such as EPDM rubber, fluororubber, etc. The lubricant inlet 13 is connected to an external device for providing a lubricant that is compatible with the process; wherein, being compatible with the process means that, for example, for the rotary mixer of the embodiment, the lubricant should be a liquid that is the same as the solvent of the mixed liquid to prevent contamination, and the specific selection is based on the actual process. The function of the centering clamp 14 and the centering screw 16 is that when the centering clamp 14 and the centering screw 16 are locked, the mechanical seal body 10, the rotating shaft positioning sleeve 1 and the main shaft can be ensured to be concentric. After the sleeve positioning screw 20 and the shaft positioning screw 21 are installed, it is preferred to remove the centering clamp 14 and the centering screw 16 and keep them intact for the next debugging. If the equipment is operated without removal, the centering clamp 14 and the centering screw 16 may cause unnecessary damage to the main shaft rotation.

[0034] In summary, the mechanical seal device of the utility model is provided with a static seal ring and a rotating seal ring that are in contact with each other in the mechanical seal body, and a secondary seal ring is provided to form an inner and outer, front and back two-level seal, and a total of four seal rings are provided, and a lubricant inlet is provided to replenish lubricant between the static seal ring and the rotating seal ring to ensure that the two are always in contact with each other during relative rotation; thus, this scheme has a better sealing effect. In addition, this scheme is also provided with a centering clamp, a centering lock ring, etc. for centering, which can better ensure the concentricity of the overall structure and facilitate structural assembly, so that the mechanical seal device can remain stable when the rotating shaft rotates, which also helps to ensure the sealing and stability of the equipment during the entire operation process.

Claims

1. A mechanical sealing device, characterized in that: The invention comprises a rotating shaft positioning sleeve (1), the rotating shaft positioning sleeve (1) is sleeved on the rotating shaft, a first sealing ring (2) is sandwiched between the rotating shaft positioning sleeve (1) and the rotating shaft; an elastic pressing member, a stationary sealing ring (6) and a rotating sealing ring (7) are sleeved on the outer side of the rotating shaft positioning sleeve (1); the stationary sealing ring (6) and the rotating sealing ring (7) are in contact and sealed; the rotating sealing ring (7) and the rotating shaft positioning sleeve (1) are clamped and a second sealing ring (8) is sandwiched between them; the stationary sealing ring (6) A secondary sealing ring (9) and a mechanical sealing body (10) are sequentially sleeved on the outer side, a third sealing ring (11) is sandwiched between the secondary sealing ring (9) and the stationary sealing ring (6), and a fourth sealing ring (12) is sandwiched between the mechanical sealing body (10) and the secondary sealing ring (9); the mechanical sealing body (10) is provided with a lubricant inlet (13) which passes through from the outside to the inside, and the lubricant inlet (13) is connected to the part between the stationary sealing ring (6) and the rotating sealing ring (7) that conflicts with each other.

2. The mechanical sealing device according to claim 1, characterized in that: The elastic tensioning member comprises a spring anti-rotation retaining ring (3) sleeved on the outside of the rotating shaft positioning sleeve (1), the spring anti-rotation retaining ring (3) is clamped with the mechanical seal body (10), the spring anti-rotation retaining ring (3) is connected to a spring seat ring (5) via a compression spring (4), the spring seat ring (5) is sleeved on the outside of the rotating shaft positioning sleeve (1), and the spring seat ring (5) is in contact with or connected to a stationary sealing ring (6); And / or, the elastic tensioning member further comprises a spring guide member (22), the spring guide member (22) is columnar and its length direction is parallel to the axial direction of the rotating shaft positioning sleeve (1); the spring guide member (22) and the compression spring (4) are both multiple and distributed along the circumference of the rotating shaft positioning sleeve (1), and the compression spring (4) is sleeved on the outside of the spring guide member (22).

3. The mechanical sealing device according to claim 1, characterized in that: A centering lock ring (15) is sleeved on the outside of the rotating shaft positioning sleeve (1), and a through top screw installation hole is opened on the centering lock ring (15) and the rotating shaft positioning sleeve (1) and a positioning top screw (17) is installed. A plurality of positioning top screws (17) are distributed along the circumferential direction.

4. The mechanical sealing device according to claim 3, characterized in that: A centering clamp (14) is provided at one end of the mechanical seal body (10); through screw mounting holes are provided on the centering clamp (14) and the centering lock ring (15) and centering screws (16) are installed thereon, and the centering lock ring (15) is in contact with the centering clamp (14).

5. The mechanical sealing device according to claim 4, characterized in that: A limiting groove (18) is provided on the mechanical seal body (10). The limiting groove (18) is annular and concentric with the rotating shaft positioning sleeve (1). The centering clamp (14) is detachably engaged with the limiting groove (18).

6. The mechanical sealing device according to claim 4, characterized in that: The centering clamp (14) is located outside the centering lock ring (15), and there are three or more centering clamps (14) distributed along the circumferential direction; and / or the centering clamp (14) and the centering lock ring (15) are located at one end of the mechanical seal body (10) away from the rotating seal ring (7).

7. The mechanical sealing device according to any one of claims 3 to 6, characterized in that: An end of the centering lock ring (15) away from the mechanical seal body (10) is provided with a limiting rib (19) extending inwardly, and the limiting rib (19) is clamped with the rotating shaft positioning sleeve (1).

8. The mechanical sealing device according to any one of claims 3 to 6, characterized in that: The positioning top screw (17) comprises a sleeve positioning top screw (20) and a shaft positioning top screw (21); the inner side end of the shaft positioning top screw (21) penetrates the rotating shaft positioning sleeve (1) and contacts the rotating shaft; the inner side end of the sleeve positioning top screw (20) is a positioning end, and the corresponding top screw installation hole of the rotating shaft positioning sleeve (1) is a positioning hole, and the positioning end is connected to the positioning hole in a matching manner.

9. The mechanical sealing device according to claim 8, characterized in that: There are nine positioning top screws (17) in total, which are divided into three groups evenly distributed along the circumferential direction, and each group includes a sleeve positioning top screw (20) and two shaft positioning top screws (21) located on both sides of the sleeve positioning top screw (20).

10. The mechanical sealing device according to any one of claims 1 to 6, characterized in that: The stationary sealing ring (6), the rotating sealing ring (7), the first sealing ring (2), the second sealing ring (8), the third sealing ring (11), and the fourth sealing ring (12) are all corrosion-resistant sealing rings; and / or the lubricant inlet (13) is connected to an external device for providing a lubricant suitable for the process.

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