CN210440584U

CN210440584U - Metal bellows mechanical seal device

Info

Publication number: CN210440584U
Application number: CN201921476334.0U
Authority: CN
Inventors: 徐亮; 薛言坤; 于云凯; 李和东; 付长林
Original assignee: Shandong Zhengming Fluid Control Equipment Co Ltd
Current assignee: Shandong Zhengming Fluid Control Equipment Co Ltd
Priority date: 2019-09-05
Filing date: 2019-09-05
Publication date: 2020-05-01
Anticipated expiration: 2029-09-05

Abstract

The utility model relates to a metal bellows mechanical seal device belongs to mechanical seal technical field, including rotating part and fixed part, the rotating part includes tailstock with axis of rotation interference fit, with the coaxial fixed connection's of tailstock bellows, with the coaxial fixed connection's of bellows rotating ring seat and with the coaxial fixed connection's of rotating ring seat rotating ring, the fixed part includes the quiet ring with cavity fixed connection, axis of rotation and quiet ring clearance fit, fixedly connected with sleeve on the rotating ring seat lateral wall, fixedly connected with the slip foot on the inner wall of the sleeve one end of keeping away from the rotating ring seat, set up the guide rail that supplies the slip foot to slide on the tailstock; the rotating shaft drives the tailstock to rotate, the tailstock drives the movable ring seat to rotate through the sleeve, torsional stress is prevented from being concentrated in the corrugated pipe, when the corrugated pipe runs for a long time in the state, cracks are prone to occurring on the surface of the corrugated pipe, working medium leakage is caused, and when the corrugated pipe is compressed or relaxed, the sliding foot slides along the guide rail.

Description

Metal bellows mechanical seal device

Technical Field

The utility model relates to a mechanical seal technical field especially relates to a metal bellows mechanical seal device.

Background

The metal corrugated pipe mechanical sealing device is connected between a port of equipment to be sealed and a rotating shaft, so that working media are prevented from leaking from the port, and has the characteristics of stable floatability, high temperature resistance, high pressure resistance, suitability for high rotating speed and long service life.

Disclosed among the prior art is a metal bellows mechanical seal device, as shown in fig. 2, including axis of rotation 1, cavity 3, tailstock 4, bellows 5, rotating ring seat 6, rotating ring 7 and quiet ring 8, tailstock 4 fixed connection is on axis of rotation 1, and quiet ring 8 fixed connection is on cavity 3, and quiet ring 8 terminal surface contradicts with rotating ring 7 terminal surface. The tailstock 4 rotates along with the rotating shaft 1, and the tailstock 4 drives the movable ring seat 6 and the movable ring 7 to rotate through the corrugated pipe 5.

The above prior art solutions have the following drawbacks: the bellows makes the rotating ring and the static ring tightly attached together, thereby playing a role of sealing. When the rotating ring rotates relative to the static ring, in order to overcome the friction force between the rotating ring and the static ring, the tailstock transmits torque to the rotating ring through the corrugated pipe, the torsional stress is concentrated in the corrugated pipe, and when the corrugated pipe runs for a long time in the state, cracks are easy to generate on the surface of the corrugated pipe, so that the working medium is leaked.

SUMMERY OF THE UTILITY MODEL

The utility model discloses to torsion stress concentrates on in the bellows among the above-mentioned prior art, and the problem of crackle easily takes place on the bellows surface provides a corrugated metal pipe mechanical seal device, can realize through following technical scheme:

the utility model provides a metal bellows mechanical seal device, includes rotating part and fixed part, the rotating part include with axis of rotation interference fit's tailstock, with the coaxial fixed connection's of tailstock bellows, with the coaxial fixed connection's of bellows rotating ring seat and with the coaxial fixed connection's of rotating ring seat rotating ring, the fixed part be including with cavity fixed connection's quiet ring, axis of rotation and quiet ring clearance fit, fixedly connected with sleeve on the rotating ring seat lateral wall, the sleeve is kept away from fixedly connected with slip foot on the inner wall of rotating ring seat one end, set up on the tailstock and supply the gliding guide rail of slip foot.

Through adopting above-mentioned technical scheme, the axis of rotation drives the tailstock and rotates, and the tailstock drives the rotating ring seat through the sleeve and rotates, avoids torsional stress to concentrate in the bellows, and the bellows is long-time operation under this state, and the bellows surface easily takes place the crackle, leads to the working medium to leak, when the bellows compression or diastole, slides the foot and slides along the guide rail.

The utility model discloses further set up to: the side wall of the sleeve is a screen.

Through adopting above-mentioned technical scheme, the screen cloth can accelerate the working medium between sleeve and the bellows to flow, avoids impurity deposits such as solid particle among the working medium in the sleeve, causes harm to the bellows for the bellows damages.

The utility model discloses further set up to: the side wall of the tailstock far away from one end of the corrugated pipe is provided with a threaded hole, a set screw is connected in the threaded hole in a threaded mode, and the set screw abuts against the rotating shaft.

Through adopting above-mentioned technical scheme, holding screw contradicts with the axis of rotation, makes tailstock and axis of rotation fixed more firm.

The utility model discloses further set up to: and one end of the threaded hole, which is far away from the rotating shaft, is provided with a sealing plug, and the sealing plug is in interference fit with the threaded hole.

By adopting the technical scheme, the sealing plug is arranged in the threaded hole, so that the working medium in the cavity can be prevented from permeating into the corrugated pipe cavity through the connecting gap between the fastening screw and the tailstock, and the leakage of the working medium is further caused.

The utility model discloses further set up to: one end of the sealing plug, which is far away from the rotating shaft, is in an arc shape and is positioned on the same arc surface with the outer side wall of the tailstock.

By adopting the technical scheme, the sealing plug is prevented from protruding out of the outer side wall of the tailstock, and in the process that the tailstock rotates along with the rotating shaft, the part of the sealing plug protruding out of the tailstock falls off from the threaded hole under the resistance of a working medium.

The utility model discloses further set up to: and the abutting end faces of the movable ring and the static ring are polished.

Through adopting above-mentioned technical scheme, because quiet ring fixed mounting is on the cavity, the rotating ring rotates for quiet ring, and the rotating ring can reduce the rotating friction force of rotating for quiet ring after the terminal surface of rotating ring and quiet ring contact is handled through polishing.

The utility model discloses further set up to: the static ring is step-shaped along the axial cross section, the step surface of the static ring is abutted to the inner wall of the cavity, a first O-shaped sealing ring is arranged on the step on the static ring, and the first O-shaped sealing ring is abutted to the inner wall of the cavity and the static ring respectively.

Through adopting above-mentioned technical scheme, the leakproofness of first O type sealing washer improvement quiet ring and cavity.

The utility model discloses further set up to: a groove is formed in one end, close to the corrugated pipe, of the inner wall of the tailstock, and a second O-shaped sealing ring is arranged in the groove.

Through adopting above-mentioned technical scheme, second O type sealing washer is contradicted with tailstock and axis of rotation, improves the leakproofness between tailstock and the axis of rotation, avoids revealing of liquid medium in the cavity.

The utility model discloses further set up to: the first O-shaped sealing ring and the second O-shaped sealing ring are made of fluororubber.

By adopting the technical scheme, the fluororubber has high chemical stability, oil resistance, high temperature resistance and good wear resistance, so that the first O-shaped sealing ring and the second O-shaped sealing ring have good working performance.

To sum up, the utility model discloses a beneficial technological effect does:

1. the tailstock drives the movable ring seat to rotate through the sleeve, so that the situation that torsional stress is concentrated in the corrugated pipe and cracks are easy to occur on the surface of the corrugated pipe is avoided, and the damage speed of the corrugated pipe is reduced;

2. the side wall of the sleeve is provided with the screen, so that the working medium between the sleeve and the corrugated pipe can be accelerated to flow out by the screen, the solid particles and other impurities in the working medium are prevented from being deposited in the sleeve to damage the corrugated pipe, and the damage of the corrugated pipe is accelerated;

3. one end of the threaded hole, which is far away from the rotating shaft, is provided with a sealing plug, the sealing plug is in interference fit with the threaded hole, and the sealing plug is arranged in the threaded hole, so that the working medium in the cavity can be prevented from permeating into the bellows cavity through the connecting gap between the set screw and the tailstock, and the leakage of the working medium is caused.

Drawings

Fig. 1 is a schematic view for showing the overall structure of the present embodiment;

fig. 2 is a schematic diagram for showing the overall structure of the prior art.

Reference numerals: 1. a rotating shaft; 3. a cavity; 4. a tailstock; 5. a bellows; 6. a movable ring seat; 7. a moving ring; 8. a stationary ring; 9. a sleeve; 10. a sliding foot; 11. a guide rail; 12. a threaded hole; 13. tightening the screw; 14. a sealing plug; 15. a first O-ring seal; 16. a groove; 17. and a second O-shaped sealing ring.

Detailed Description

The present invention will be described in further detail with reference to the accompanying drawings.

Examples

As shown in fig. 1, for the utility model discloses a metal bellows mechanical seal device, including rotating part and fixed part, the rotating part include with 1 interference fit's of axis of rotation tailstock 4, with 4 coaxial fixed connection's of tailstock bellows 5, with 5 coaxial fixed connection's of bellows rotating ring seat 6 and with 6 coaxial fixed connection's of rotating ring seat rotating ring 7, the fixed part include with 3 fixed connection's of cavity quiet ring 8, axis of rotation 1 and 8 clearance fit of quiet ring. One side end face of rotating ring 7 is contradicted with one side end face of quiet ring 8, and rotating shaft 1 drive rotating ring 7 rotates for quiet ring 8. The bellows 5 pushes the end faces of the movable ring 7 and the stationary ring 8 to be tightly attached together, so that the mechanical sealing effect is achieved. The matched end surfaces of the movable ring 7 and the static ring 8 are polished, so that the friction coefficient of the end surfaces is reduced, and the friction force of the movable ring 7 relative to the static ring 8 during rotation is reduced.

As shown in fig. 1, a sleeve 9 is fixedly connected to an outer wall of the rotating ring seat 6, a sliding foot 10 is fixedly connected to an inner wall of the sleeve 9 far away from one end of the rotating ring seat 6, a guide rail 11 for sliding the sliding foot 10 is provided on the tailstock 4, and the sliding foot 10 is connected with an outer side wall of the tailstock 4 in a sliding manner. The rotating shaft 1 drives the tailstock 4 to rotate, the tailstock 4 drives the movable ring seat 6 to rotate through the sleeve 9, the tailstock 4 is prevented from driving the movable ring seat 6 to rotate through the corrugated pipe 5, the torsional stress is prevented from being concentrated in the corrugated pipe 5, and when the corrugated pipe 5 runs for a long time under the state, cracks occur on the surface of the corrugated pipe 5, so that the working medium is prevented from leaking. When the bellows 5 is compressed or relaxed, the sliding foot 10 slides along the guide rail 11. The sleeve 9 is in a screen mesh shape (not shown in the figure), and the screen mesh-shaped sleeve 9 can accelerate the outflow of the working medium between the sleeve 9 and the corrugated pipe 5, so that the solid particles and other impurities in the working medium are prevented from being deposited in the sleeve 9 and causing damage to the corrugated pipe 5.

As shown in fig. 1, a threaded hole 12 is formed in a side wall of one end of the tailstock 4, which is far away from the bellows 5, a set screw 13 is connected to the threaded hole 12 through an internal thread, and the set screw 13 abuts against the rotating shaft 1 to firmly fix the tailstock 4 on the rotating shaft 1. In order to avoid leakage caused by the fact that the working medium in the cavity 3 permeates into the corrugated pipe 5 through a connecting gap between the set screw 13 and the tailstock 4, one end, far away from the rotating shaft 1, of the threaded hole 12 is provided with a sealing plug 14, and the sealing plug 14 is in interference fit with the threaded hole 12. The end, far away from the rotating shaft 1, of the sealing plug 14 is in an arc shape and is located on the same arc surface with the outer side wall of the tailstock 4, the arc-shaped arrangement of the sealing plug 14 prevents the sealing plug 14 from protruding out of the outer side wall of the tailstock 4, and in the process that the sealing plug 14 rotates along with the tailstock 4, the sealing plug 14 falls off from the threaded hole 12 under the resistance of the working medium in the cavity 3, so that the working medium is leaked.

As shown in fig. 1, the axial cross section of the stationary ring 8 is stepped, and the stepped surface of the stationary ring 8 is abutted against the inner wall of the cavity 3. In order to improve the tightness of the interference between the static ring 8 and the inner wall of the cavity 3, a first O-shaped sealing ring 15 is arranged on the step of the static ring 8, and the first O-shaped sealing ring 15 is respectively abutted against the inner wall of the cavity 3 and the static ring 8. The one end that the tail seat 4 inner wall is close to bellows 5 is seted up flutedly 16, is provided with second O type sealing washer 17 in the recess 16, and second O type sealing washer 17 contradicts with tail seat 4 and axis of rotation 1, and second O type sealing washer 17 improves the leakproofness between tail seat 4 and the axis of rotation 1, avoids revealing of working medium in the cavity 3. The first O-shaped sealing ring 15 and the second O-shaped sealing ring 17 are made of fluororubber, and the fluororubber has the advantages of oil resistance and high temperature resistance and also has good wear resistance, so that the good working performance of the first O-shaped sealing ring 15 and the second O-shaped sealing ring 17 is ensured.

Specific implementation of this example:

the first O-shaped sealing ring 15 is sleeved on the static ring 8, the second O-shaped sealing ring 17 is placed in the groove 16, and the static ring 8 is fixedly connected with the cavity 3. Install corrugated metal pipe 2 on axis of rotation 1, set screw 13 screw in screw hole 12 and contradict with axis of rotation 1, sealing plug 14 stopper to the screw hole 12 in, axis of rotation 1 passes quiet ring 8, and rotating ring 7 contradicts with quiet ring 8.

Claims

1. The utility model provides a metal bellows mechanical seal device, includes rotating part and fixed part, the rotating part include with axis of rotation (1) interference fit's tailstock (4), with tailstock (4) coaxial fixed connection's bellows (5), with bellows (5) coaxial fixed connection's rotating ring seat (6) and with rotating ring seat (6) coaxial fixed connection's rotating ring (7), the fixed part include with cavity (3) fixed connection's quiet ring (8), axis of rotation (1) and quiet ring (8) clearance fit, a serial communication port, fixedly connected with sleeve (9) on rotating ring seat (6) lateral wall, fixed connection slip foot (10) on the inner wall of rotating ring seat (6) one end is kept away from in sleeve (9), offer on tailstock (4) lateral wall and supply gliding guide rail (11) of slip foot (10).

2. A metal bellows mechanical seal according to claim 1, wherein the side wall of the sleeve (9) is a mesh.

3. A metal bellows mechanical sealing device according to claim 1, wherein a threaded hole (12) is formed in a side wall of the tailstock (4) far away from the end of the bellows (5), a set screw (13) is connected to the threaded hole (12) in a threaded manner, and the set screw (13) abuts against the rotating shaft (1).

4. A metal bellows mechanical seal device according to claim 3, wherein a sealing plug (14) is provided at an end of the threaded hole (12) away from the rotating shaft (1), and the sealing plug (14) is in interference fit with the threaded hole (12).

5. A metal bellows mechanical seal device according to claim 4, wherein the end of the sealing plug (14) away from the rotating shaft (1) is arc-shaped and is in the same arc surface with the outer side wall of the tailstock (4).

6. A metal bellows mechanical seal device according to claim 1, wherein the abutting end faces of the movable ring (7) and the stationary ring (8) are polished.

7. A metal bellows mechanical seal device according to claim 1, wherein the stationary ring (8) has a step-like cross section along the axial direction, the step surface of the stationary ring (8) is abutted against the inner wall of the cavity (3), the step of the stationary ring (8) is provided with a first O-ring (15), and the first O-ring (15) is abutted against the inner wall of the cavity (3) and the stationary ring (8), respectively.

8. A metal bellows mechanical seal device according to claim 7, wherein a groove (16) is formed in an inner wall of the tailstock (4) near the end of the bellows (5), and a second O-ring (17) is disposed in the groove (16).

9. A metal bellows mechanical seal according to claim 8, wherein the first O-ring (15) and the second O-ring (17) are made of viton.