A stationary mechanical seal device

Abstract

The utility model discloses a stationary mechanical seal device, including kettle mouth flange, seal box, axle sleeve, dynamic ring subassembly and static ring subassembly, kettle mouth flange is fixed at the opening of reaction kettle, and axle sleeve is sleeved in the stirring shaft outer periphery and rotates with it, and dynamic ring subassembly sets up on axle sleeve, static ring subassembly includes static ring and static ring seat, and static ring is located the axial one side of dynamic ring subassembly and forms end face seal with dynamic ring subassembly, and the inside of static ring seat forms annular cavity for accommodating static ring, and the opposite side of static ring and dynamic ring subassembly is equipped with elastic compensation mechanism, the inside wall of static ring seat is equipped with annular groove, and the radial outer periphery of static ring is equipped with lug and is adapted with annular groove, the utility model discloses the cooperation of annular groove of static ring seat inside setting and the lug of radial protruding on static ring, realizes the axial self -locking and quick installation of static ring under the precompression of spring, and simultaneously, the interlocking structure of annular groove and lug avoids static ring and rotates with dynamic ring under the circumferential friction force effect.

Description

Technical Field

[0001] This utility model relates to the field of mechanical seal technology, and in particular to a static mechanical seal device. Background Technology

[0002] Traditional mechanical seals primarily rely on elastic compensation mechanisms on the opposite sides of the stationary and rotating rings to apply axial force for end-face sealing. However, during installation, to ensure the spring has pre-compression, the operator needs to simultaneously overcome the spring force and correct the circumferential angle of the stationary ring and its perpendicularity to the end face. This process is cumbersome and makes it difficult to precisely control the spring pre-compression, directly affecting the initial preload of the sealing end face and creating potential operational hazards. Furthermore, the stationary ring lacks an effective circumferential anti-rotation structure, or relies solely on the friction between it and the auxiliary sealing ring between it and the stationary ring seat for anti-rotation. Moreover, this friction is often insufficient to withstand the enormous circumferential friction generated by the high-speed rotation of the rotating ring, easily leading to the stationary ring "following" the rotation. In addition, the auxiliary sealing ring is prone to wear and failure in this situation; moreover, the auxiliary sealing ring significantly increases the frictional resistance of the stationary ring's axial movement, affecting the self-adaptive compensation capability of the sealing end face. Therefore, a mechanical seal structure that can simultaneously solve the problem of reliable anti-rotation of the stationary ring and facilitate installation is urgently needed. Utility Model Content

[0003] To solve the above-mentioned technical problems, this utility model provides a static mechanical seal device.

[0004] The technical solution of this utility model is:

[0005] It includes a vessel flange, a sealing housing, a bushing, a rotating ring assembly, and a stationary ring assembly. The vessel flange is fixed at the opening of the reactor, and the end where the vessel flange is located is defined as the lower end. The bushing is fitted around the outer circumference of the stirring shaft and rotates with it. The rotating ring assembly is mounted on the bushing.

[0006] The stationary ring assembly includes a stationary ring and a stationary ring seat. The stationary ring is located on one axial side of the rotating ring assembly and forms an end face seal with the rotating ring assembly. An annular cavity for accommodating the stationary ring is formed on the inner side of the stationary ring seat. An elastic compensation mechanism is provided on the opposite side of the stationary ring and the rotating ring assembly.

[0007] The inner wall of the stationary ring seat is provided with an annular groove, and the radial outer periphery of the stationary ring is provided with a lug that matches the annular groove.

[0008] Furthermore: the moving ring assembly includes a moving ring, and two sets of stationary ring assemblies are symmetrically distributed on both sides of the moving ring along the axial direction; under the axial elastic force of the elastic compensation mechanism on the corresponding side, the end faces of the two stationary rings respectively engage with the two end faces of the moving ring to form a double-end-face sealing structure.

[0009] Furthermore, the inner wall of the stationary ring seat is provided with a plurality of annular grooves spaced along the axial direction, and each annular groove is provided with an independent axial inlet. Each lug is placed into the corresponding annular groove through the corresponding axial inlet.

[0010] Furthermore, it also includes a spring seat, wherein one of the elastic compensation mechanisms is disposed between the vessel flange and the corresponding stationary ring, and the other elastic compensation mechanism is disposed between the spring seat and the corresponding stationary ring;

[0011] The elastic compensation mechanism includes a spring and a push ring. One end of the spring acts on the vessel flange or spring seat, and the other end abuts against the back of the corresponding stationary ring through the push ring.

[0012] Furthermore, it also includes two stationary ring seats, which are respectively disposed on the radial outer periphery of the two stationary rings; an annular cavity for accommodating the corresponding stationary ring is formed on the inner side of each stationary ring seat.

[0013] Furthermore: the spring seat is provided with an axially extending first limiting ring on the side facing the stationary ring, and the vessel flange is provided with an axially extending second limiting ring on the side facing the stationary ring. The first limiting ring and the second limiting ring are respectively fitted with the radial inner circumference clearance of the corresponding side stationary ring.

[0014] Furthermore, the moving ring assembly also includes a transmission pin and a second stop ring. The moving ring is connected to the bushing via the transmission pin. The second stop ring is mounted on the bushing and cooperates with the transmission pin to achieve axial bidirectional limiting of the moving ring.

[0015] Furthermore, it also includes a bearing support assembly, which includes a bearing housing and a bearing. The bearing housing is fixed to the sealed housing, and the outer ring of the bearing is interference-fitted with the bearing housing. An axial positioning step is machined on the outer circumference of the bushing, and the inner ring of the bearing is sleeved on the bushing, with its lower end face abutting against the axial positioning step.

[0016] Furthermore: the upper end face of the bearing is provided with a bearing cover, which is fixed to the bearing seat; the upper end of the bearing cover is provided with a positioning card, and the outer periphery of the bushing is provided with a slot, which is inserted into the slot and locked and fixed to the bearing cover by the cover fastener.

[0017] Furthermore: both axial ends of the bearing are provided with skeleton oil seals, one set of which is installed in the oil seal cavity formed inside the bearing cover, and its lip is interference-fitted with the outer circumferential surface of the bushing; the other set of skeleton oil seals is installed on the radial outer side of the axial positioning step, and its lip is interference-fitted with the outer circumferential surface of the axial positioning step.

[0018] The beneficial technical effects of this utility model are as follows: Through the symmetrically arranged stationary ring and elastic compensation mechanism, the rotating ring is simultaneously subjected to continuous axial elastic force on both sides, which can automatically compensate for the sway and vibration of the stirring shaft during equipment operation, maintain a tight fit of the sealing end face, and improve the stability and reliability of the sealing device. The annular groove on the inner side of the stationary ring seat cooperates with the radially protruding lug on the stationary ring, achieving axial self-locking and quick installation of the stationary ring while ensuring the pre-compression of the spring. Simultaneously, the interlocking structure of the annular groove and the lug prevents the stationary ring from rotating with the rotating ring under circumferential friction. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0020] The components are as follows: 1. Reactor flange; 2. Sealing housing; 3. Bushing; 4. Axial positioning step; 5. First sealing ring; 6. Bearing housing; 7. Bearing; 8. Oil seal; 9. Bearing cap; 10. First stop ring; 11. Positioning clip; 12. Moving ring; 13. Transmission pin; 14. Second stop ring; 15. Second sealing ring; 16. Stationary ring; 17. Stationary ring seat; 18. Spring seat; 19. Spring; 20. Push ring; 21. Annular groove; 22. Lug; 23. First limiting ring; 24. Second limiting ring; 25. Third sealing ring; 26. Fourth sealing ring; 27. Sealing fluid inlet and outlet. Detailed Implementation

[0021] In order to better understand the technical means of this utility model and to implement it in accordance with the contents of the specification, the specific embodiments of this utility model will be further described in detail below with reference to the accompanying drawings and examples. The following examples are used to illustrate this utility model, but are not intended to limit the scope of this utility model.

[0022] like Figure 1 As shown, the static mechanical seal device of this utility model includes a vessel flange 1, a sealing housing 2 tightly connected to the vessel flange 1, a bushing 3 fixedly sleeved on the outer circumferential surface of the stirring shaft, a bearing support assembly supported and connected to the bushing 3, a dynamic ring assembly drivenly connected to the bushing 3, and two sets of static ring assemblies symmetrically arranged at both ends of the dynamic ring assembly along the axial direction. The vessel flange 1 is fixed to the opening flange of the reactor by bolts and constitutes the static mounting base of the entire device, with the end where the vessel flange 1 is located defined as the lower end. The bushing 3 is tightly installed with the stirring shaft by set screws and rotates together with the stirring shaft. An axial positioning step 4 is machined on the outer circumference of the bushing 3, and the inner circumference of the bushing 3 is sealed with the stirring shaft by multiple first sealing rings 5 ​​to prevent the medium from leaking outward along the stirring shaft.

[0023] The bearing support assembly provides stable rotational support for the bushing 3, including a bearing housing 6 and a bearing 7. The bearing housing 6 is fixed to the sealed housing 2. The outer ring of the bearing 7 is interference-fitted with the inner hole of the bearing housing 6, and the inner ring of the bearing 7 is tightly fitted onto the bushing 3. The lower end face of the inner ring of the bearing 7 abuts against the axial positioning step 4, thereby achieving axial positioning of its lower end face. A bearing cap 9 is provided on the upper end face of the bearing 7, which is fixed to the bearing housing 6 to press the upper end face of the bearing 7. A first stop ring 10 is also installed on the bushing 3 on the upper end face of the bearing 7. The first stop ring 10 cooperates with the bearing cap 9 to prevent the bearing 7 from moving axially.

[0024] Both axial ends of the bearing support assembly are provided with skeleton oil seals 8. An oil seal cavity is formed on the inner side of the bearing cap 9. One set of skeleton oil seals 8 is installed in the oil seal cavity, with its lip interlocked with the outer circumferential surface of the bushing 3 to form a dynamic seal, used to prevent external contaminants from entering the bearing cavity and to prevent grease from leaking outwards from the bearing cavity. Another set of skeleton oil seals 8 is installed radially outside the axial positioning step 4, with its lip interlocked with the outer circumferential surface of the axial positioning step 4 to form a dynamic seal, used to seal the grease in the bearing cavity from leaking into the mechanical seal cavity at the lower end.

[0025] The bearing cover 9 is provided with a positioning card 11 at its upper end. The bushing 3 has a slot on its outer periphery that matches the positioning card 11. The positioning card 11 is inserted into the slot and locked and fixed to the bearing cover 9 by the cover fastener, so as to prevent the bearing cover 9 from rotating circumferentially relative to the bushing 3.

[0026] The rotating ring assembly includes a rotating ring 12, a transmission pin 13, and a second stop ring 14. The rotating ring 12 is fixedly mounted on the bushing 3 via the transmission pin 13 and rotates synchronously with it. The second stop ring 14 is mounted on the bushing 3 and located at one axial end of the rotating ring 12, cooperating with the transmission pin 13 to achieve bidirectional axial limiting of the rotating ring 12. A second sealing ring 15 is provided between the rotating ring 12 and the bushing 3 to prevent leakage of the medium along this point.

[0027] The two sets of stationary ring assemblies include two stationary rings 16 and two stationary ring seats 17. The two stationary rings 16 are symmetrically arranged on both sides of the axial direction of the rotating ring 12 and engage with the two end faces of the rotating ring 12 to form a double-end-face sealing structure. The two stationary ring seats 17 are respectively disposed on the radial outer periphery of the two stationary rings 16. An annular cavity is formed on the inner side of each stationary ring seat 17 to accommodate the corresponding stationary ring 16, so as to achieve radial constraint on the stationary ring 16, while allowing the stationary ring 16 to have a certain floating displacement along the axial direction.

[0028] Both stationary rings 16 are provided with elastic compensation mechanisms on their backs, and also include spring seats 18. One of the elastic compensation mechanisms is located between the vessel flange 1 and the corresponding stationary ring 16, and the other elastic compensation mechanism is located between the spring seat 18 and the corresponding stationary ring 16. Specifically, the elastic compensation mechanism includes a spring 19 and a push ring 20. One end of the spring 19 acts on the vessel flange 1 or the spring seat 18, and the other end abuts against the back of the corresponding stationary ring 16 through the push ring 20.

[0029] With two stationary rings 16 acting back-to-back on the same rotating ring 12, when shaft sway or vibration occurs during equipment operation, the springs 19 on both sides can continuously apply axial force to the stationary rings 16, which can automatically maintain the tight fit between the contact surfaces of the rotating ring 12 and the stationary rings 16, giving the entire sealing device excellent anti-sway and anti-vibration capabilities.

[0030] Furthermore, the inner wall of the stationary ring seat 17 is provided with a plurality of annular grooves 21 spaced apart along the axial direction, and an axial inlet corresponding to each of the annular grooves 21 is also provided. The radial outer periphery of the stationary ring 16 is provided with a plurality of radially protruding lugs 22, each of the lugs 22 being adapted to each of the annular grooves 21.

[0031] The huge circumferential friction force transmitted by the rotating ring 12 to the stationary ring 16 during high-speed rotation can prevent the stationary ring 16 from rotating with the rotating ring 12 under the action of friction through the interlocking of the annular groove 21 and the lug 22; at the same time, the multiple annular grooves 21 ensure that the axial floating of the stationary ring 16 is more stable.

[0032] During installation, the lug 22 of the stationary ring 16 is aligned with and inserted into the axial inlet on the inner wall of the stationary ring seat 17, and pushed axially to a preset position to pre-compress the spring 19. The stationary ring 16 is then rotated, causing the lug 22 to slide from the axial inlet into the bottom of the selected annular groove 21. The preload generated by the spring 19 acts continuously on the back of the stationary ring 16 through the push ring 20, ensuring that the lug 22 remains in contact with the bottom surface of the selected annular groove 21, thus forming an axial self-locking mechanism that secures the stationary ring 16 at the preset preload position. This structure simplifies the installation process.

[0033] During operation, the stationary ring 16 can drive its lug 22 to make a slight floating motion within the axial space of the annular groove 21, so as to achieve automatic compensation of the sealing end face.

[0034] The spring seat 18 has an axially extending first limiting ring 23 on the side facing the stationary ring 16, and the vessel flange 1 has an axially extending second limiting ring 24 on the side facing the stationary ring 16. The first limiting ring 23 and the second limiting ring 24 respectively form a clearance fit with the radial inner circumference of the corresponding stationary ring 16 to cooperate with each stationary ring seat 17 to achieve radial limiting of the two stationary rings 16. In this embodiment, a third sealing ring 25 is provided between the first limiting ring 23, the second limiting ring 24 and the corresponding stationary ring 16 to prevent the medium from leaking along the inner circumference of the corresponding stationary ring 16 to the spring 19 cavity on the corresponding side.

[0035] In this embodiment, the mating surfaces between the stationary ring seat 17 and the spring seat 18, and the mating surfaces between the stationary ring seat 17 and the vessel flange 1, are respectively provided with fourth sealing rings 26. The two sets of fourth sealing rings 26 are used to prevent external contaminants from entering the corresponding spring 19 cavities.

[0036] In this embodiment, the sealed housing 2 is also provided with a sealing liquid inlet and outlet 27. The sealing liquid inlet and outlet 27 is connected to the sealed chamber formed by the moving ring 12, two stationary ring seats 17 and two stationary rings 16. Clean sealing liquid with a certain pressure is injected into the sealed chamber through the sealing liquid inlet and outlet 27 to isolate the reactor from the external environment, and at the same time, it serves as a lubricant between the two end faces of the two stationary rings 16 and the moving ring 12.

[0037] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the technical principles of the present utility model, and these improvements and modifications should also be considered within the protection scope of the present utility model.

Claims

1. A static mechanical seal device, comprising a vessel flange (1), a sealing housing (2), a bushing (3), a rotating ring assembly, and a stationary ring assembly, wherein the vessel flange (1) is fixed at the opening of the reactor, the end of the vessel flange (1) is defined as the lower end, the bushing (3) is sleeved on the outer circumference of the stirring shaft and rotates with it, and the rotating ring assembly is disposed on the bushing (3); characterized in that: The stationary ring assembly includes a stationary ring (16) and a stationary ring seat (17). The stationary ring (16) is located on one axial side of the moving ring assembly and forms an end face seal with the moving ring assembly. The inner side of the stationary ring seat (17) has an annular cavity for accommodating the stationary ring (16). An elastic compensation mechanism is provided on the opposite side of the stationary ring (16) and the moving ring assembly. The inner wall of the stationary ring seat (17) is provided with an annular groove (21), and the radial outer periphery of the stationary ring (16) is provided with a lug (22) that matches the annular groove (21).

2. The static mechanical seal device according to claim 1, characterized in that: The moving ring assembly includes a moving ring (12), and two sets of stationary ring assemblies are symmetrically distributed on both sides of the axial direction of the moving ring (12). Under the axial elastic force of the elastic compensation mechanism on the corresponding side, the end faces of the two stationary rings (16) are respectively engaged with the two end faces of the moving ring (12) to form a double-end face sealing structure.

3. A static mechanical seal device according to claim 2, characterized in that: The inner sidewall of the stationary ring seat (17) is provided with a plurality of annular grooves (21) spaced along the axial direction. Each annular groove (21) is provided with an independent axial inlet. Each lug (22) is placed into the corresponding annular groove (21) through the corresponding axial inlet.

4. A static mechanical seal device according to claim 1, characterized in that: It also includes a spring seat (18), one of the elastic compensation mechanisms being disposed between the vessel flange (1) and the corresponding stationary ring (16), and the other elastic compensation mechanism being disposed between the spring seat (18) and the corresponding stationary ring (16); The elastic compensation mechanism includes a spring (19) and a push ring (20). One end of the spring (19) acts on the vessel flange (1) or spring seat (18), and the other end abuts against the back of the corresponding stationary ring (16) through the push ring (20).

5. A static mechanical seal device according to claim 4, characterized in that: It also includes two stationary ring seats (17), which are respectively disposed on the radial outer periphery of the two stationary rings (16); each stationary ring seat (17) has an annular cavity formed on its inner side for accommodating the corresponding stationary ring (16).

6. A static mechanical seal device according to claim 5, characterized in that: The spring seat (18) is provided with an axially extending first limiting ring (23) on the side facing the stationary ring (16), and the vessel flange (1) is provided with an axially extending second limiting ring (24) on the side facing the stationary ring (16). The first limiting ring (23) and the second limiting ring (24) respectively cooperate with the radial inner circumference clearance of the corresponding side stationary ring (16).

7. A static mechanical seal device according to claim 1, characterized in that: The moving ring assembly also includes a transmission pin (13) and a second stop ring (14). The moving ring (12) is connected to the bushing (3) via the transmission pin (13). The second stop ring (14) is installed on the bushing (3) and cooperates with the transmission pin (13) to achieve axial bidirectional limiting of the moving ring (12).

8. A static mechanical seal device according to claim 1, characterized in that: It also includes a bearing support assembly, which includes a bearing housing (6) and a bearing (7). The bearing housing (6) is fixed on the sealed housing (2), and the outer ring of the bearing (7) is interference-fitted with the bearing housing (6). An axial positioning step (4) is machined on the outer periphery of the bushing (3), and the inner ring of the bearing (7) is sleeved on the bushing (3), with its lower end face abutting against the axial positioning step (4).

9. The static mechanical seal device according to claim 8, characterized in that: The upper end face of the bearing (7) is provided with a bearing cover (9), which is fixed on the bearing seat (6); the upper end of the bearing cover (9) is provided with a positioning card (11), and the outer periphery of the bushing (3) is provided with a slot, which is inserted into the slot and locked and fixed to the bearing cover (9) by the cover fastener.

10. A static mechanical seal device according to claim 9, characterized in that: Both ends of the bearing (7) are provided with skeleton oil seals (8). One set of skeleton oil seals (8) is installed in the oil seal cavity formed inside the bearing cover (9), and its lip is interference-fitted with the outer circumferential surface of the bushing (3). The other set of skeleton oil seals (8) is installed on the radial outer side of the axial positioning step (4), and its lip is interference-fitted with the outer circumferential surface of the axial positioning step (4).

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