Piston type mechanical seal allowing large-amplitude axial displacement
By adopting a piston-type design in mechanical seals, combining lip seal ring, O-ring and anti-rotating pin, the problem of axial displacement affecting seal performance is solved, and the stability of seal performance and the long life of the equipment is achieved.
Patent Information
- Application Number
- CN202420746729.2
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-04-11
- Publication Date
- 2025-05-02
- Estimated Expiration
- 2034-04-11
AI Technical Summary
When existing mechanical seals are displaced axially, the sealing performance is poor, which can easily lead to leakage and affect the normal use of the equipment.
The piston-type mechanical seal design is adopted, including lip seals, O-rings and anti-rotation pins. Through the cooperation of these components, axial displacement is achieved while maintaining sealing performance.
It effectively avoids the problem of axial displacement affecting the sealing effect, ensures the stability of sealing performance, prevents leakage, and extends the service life of the equipment.
Smart Images
Figure CN222823731U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of mechanical seals, in particular to a piston-type mechanical seal which allows large-scale axial displacement. Background Art
[0002] Mechanical seal, whose full name is mechanical seal, is generally called mechanical seal in the industry. It is a device used to solve the sealing problem between the rotating shaft and the machine body. It consists of at least one pair of end faces perpendicular to the rotating axis, which maintain contact and relative sliding under the action of fluid pressure, the elastic force of the compensation mechanism and the cooperation of auxiliary seals to prevent fluid leakage.
[0003] Although the existing technology can play a certain sealing role, the displacement of the general seal shaft is directly loaded on the mechanical seal, which not only makes the mechanical seal always have a poor fit with the shaft, but also easily causes the axial displacement of the equipment to affect the sealing effect. Summary of the invention
[0004] The technical problem to be solved by the utility model is to provide a piston-type mechanical seal that allows large axial displacement, which can effectively solve the problems in the prior art that the mechanical seal always has poor fit with the shaft and the axial displacement of the equipment affects the sealing effect.
[0005] The technical solution adopted by the utility model is: a piston-type mechanical seal that allows large axial displacement, including a mounting sleeve, an active ring seat is fixedly mounted on the outer side of the mounting sleeve, a sealing structure is arranged on the outer side of the active ring seat, a bellows is fixedly mounted on the outer side of the sealing structure, a groove is provided on the outer side of the bellows, an anti-rotation pin is arranged on the outer side of the groove, a kettle body is fixedly mounted on the outer side of the bellows, a sealing ring 1 is fixedly mounted on the outer side of the bellows, a sealing ring 2 is fixedly mounted on the outer side of the bellows, a through groove is arranged inside the sealing structure, a connecting pipe is arranged at the bottom of the bellows, an inlet is arranged on the outer side of the connecting pipe, an inner shell body is fixedly mounted on the outer side of the mounting sleeve, an expansion sleeve is fixedly mounted on the outer side of the inner shell, a plurality of bolts are fixedly mounted on the outer side of the expansion sleeve, a sealing ring 1 is arranged on the outer side of the mounting sleeve, and a sealing ring 2 is fixedly mounted on the outer side of the active ring seat.
[0006] Preferably, the first sealing ring is in a lip-shaped structure, and the second sealing ring is in an "O"-shaped structure.
[0007] Through the above technical solution, the lip seal ring 1 and the O-ring 2 can not only seal the gap between the mechanical seal and the kettle body, but also move axially forward and backward to ensure the sealing performance and avoid leakage during use, which affects normal use.
[0008] Preferably, the anti-rotation pin passes through the slot and extends to the interior of the kettle body, and the slot is in a "circular" structure.
[0009] Through the above technical solution, the anti-rotation pin is designed to absorb the torque generated when the mechanical seal rotates, fix the outer flange of the mechanical seal, and prevent the outer flange of the mechanical seal from rotating relative to the kettle body, affecting normal use.
[0010] Preferably, the sealing ring 1 is located on the left side of the mounting sleeve, and the sealing ring 2 is located on the top of the active ring seat.
[0011] Through the above technical solution, the sealing performance of the installation sleeve can be improved through the design of the sealing ring 1 to avoid leakage of the installation sleeve, and the sealing performance of the active ring seat can be improved through the design of the sealing ring 2.
[0012] Preferably, the through groove, the connecting pipe and the inlet are connected to each other, and the through groove, the connecting pipe and the inlet are in one-to-one correspondence.
[0013] Through the above technical solution, through the design of the through groove, the connecting pipe and the inlet, cooling water or leakage liquid can be put into the inlet and then enter the through groove from the connecting pipe, so as to achieve internal cooling.
[0014] Preferably, the bolts penetrate the outer flange and extend to the interior of the expansion sleeve, and a plurality of the bolts are distributed in a ring shape.
[0015] Through the above technical solution, the outer flange and the expansion sleeve can be fixedly installed through the design of the bolts, and the design of multiple bolts can improve the overall stability and prevent a single bolt from falling off and affecting normal installation.
[0016] Preferably, the active ring seat is made of 316L material, and the expansion sleeve is made of 304 stainless steel material.
[0017] Through the above technical solution, the active ring seat made of 316L material can improve the overall service life, and the expansion sleeve made of 304 stainless steel is not easy to be corroded and damaged, thereby improving the overall practicality.
[0018] Compared with the prior art, the utility model provides a piston-type mechanical seal that allows large axial displacement, and has the following beneficial effects:
[0019] 1. This piston type mechanical seal allows large axial displacement. A piston compensation structure is added between the mechanical seal and the mounting flange of the equipment. In this way, the thermal expansion and contraction of the shaft of the mixing kettle are absorbed by the bellows, and the mechanical seal always fits tightly with the shaft. The sealing performance of the piston compensation structure is also based on the sealing performance of the piston compensation structure. The axial displacement of the equipment is prevented from affecting the sealing effect.
[0020] 2. This piston type mechanical seal allows large axial displacement. This piston compensation structure consists of a set of lip seals, O-rings and anti-rotation pins. The lip seals and O-rings can not only seal the gap between the mechanical seal and the kettle body, but also move axially forward and backward to ensure the sealing performance. The anti-rotation pin can absorb the torque generated when the mechanical seal rotates, fix the outer flange of the mechanical seal, and prevent the outer flange of the mechanical seal from rotating relative to the kettle body. BRIEF DESCRIPTION OF THE DRAWINGS
[0021] Figure 1 The three-dimensional structure of the utility model is shown in FIG. Figure 1 ;
[0022] Figure 2 The three-dimensional structure of the utility model is shown in FIG. Figure 2 ;
[0023] Figure 3 The three-dimensional structure of the utility model is shown in FIG. Figure 3 ;
[0024] Figure 4 This is a schematic diagram of the cross-sectional structure of the utility model;
[0025] Figure 5 For this utility model Figure 4 Enlarged structural diagram at A in the middle.
[0026] Among them: 1. Installation sleeve; 2. Active ring seat; 3. Sealing structure; 4. Bellows; 5. Slot; 6. Anti-rotation pin; 7. Kettle body; 8. Sealing ring 1; 9. Sealing ring 2; 10. Through slot; 11. Connecting pipe; 12. Inlet; 13. Inner shell; 14. Expansion sleeve; 15. Bolt; 16. Sealing ring 1; 17. Sealing ring 2. DETAILED DESCRIPTION
[0027] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.
[0028] Embodiment 1: Figure 1-5As shown, the utility model provides a piston-type mechanical seal that allows large axial displacement, including a mounting sleeve 1, an active ring seat 2 is fixedly mounted on the outer side of the mounting sleeve 1, a sealing structure 3 is arranged on the outer side of the active ring seat 2, a bellows 4 is fixedly mounted on the outer side of the sealing structure 3, a groove 5 is provided on the outer side of the bellows 4, an anti-rotation pin 6 is arranged on the outer side of the groove 5, a kettle body 7 is fixedly mounted on the outer side of the bellows 4, a sealing ring 1 8 is fixedly mounted on the outer side of the bellows 4, a sealing ring 2 9 is fixedly mounted on the outer side of the bellows 4, a through groove 10 is arranged inside the sealing structure 3, a connecting pipe 11 is arranged at the bottom of the bellows 4, an inlet 12 is arranged on the outer side of the connecting pipe 11, an inner shell 13 is fixedly mounted on the outer side of the mounting sleeve 1, an expansion sleeve 14 is fixedly mounted on the outer side of the inner shell 13, a plurality of bolts 15 are fixedly mounted on the outer side of the expansion sleeve 14, a sealing ring 16 is arranged on the outer side of the mounting sleeve 1, and a sealing ring 2 17 is fixedly mounted on the outer side of the active ring seat 2.
[0029] Specifically, the sealing ring 1 8 is a lip-shaped structure, and the sealing ring 2 9 is an "O"-shaped structure. The advantage is that the lip-shaped sealing ring 1 8 and the O-shaped sealing ring 2 9 can not only seal the gap between the mechanical seal and the kettle body 7, but also move axially forward and backward to ensure the sealing performance and avoid leakage during use, which affects normal use.
[0030] Specifically, the anti-rotation pin 6 passes through the slot 5 and extends to the interior of the kettle body 7. The slot 5 has a "circular" structure. The advantage is that the design of the anti-rotation pin 6 can absorb the torque generated when the mechanical seal rotates, fix the outer flange of the mechanical seal, and prevent the outer flange of the mechanical seal from rotating relative to the kettle body 7, affecting normal use.
[0031] Specifically, sealing ring 16 is located on the left side of the mounting sleeve 1, and sealing ring 2 17 is located on the top of the active ring seat 2. The advantage is that the design of sealing ring 16 can improve the sealing performance of the mounting sleeve 1 and avoid leakage of the mounting sleeve 1, and the design of sealing ring 2 17 can improve the sealing performance of the active ring seat 2.
[0032] Embodiment 2: Figure 2-5 As shown, as an improvement to the previous embodiment.
[0033] Specifically, the through groove 10, the connecting pipe 11 and the inlet 12 are connected to each other, and the through groove 10, the connecting pipe 11 and the inlet 12 are in one-to-one correspondence. The advantage is that, through the design of the through groove 10, the connecting pipe 11 and the inlet 12, cooling water or leakage liquid can be put into the inlet 12 and then enter into the through groove 10 from the connecting pipe 11, so as to realize internal cooling.
[0034] Specifically, the bolts 15 pass through the outer flange and extend to the interior of the expansion sleeve 14. Multiple bolts 15 are distributed in a ring shape. The advantage is that the outer flange and the expansion sleeve 14 can be fixedly installed through the design of the bolts 15, and the design of multiple bolts 15 can improve the overall stability and prevent a single bolt 15 from easily falling off and affecting normal installation.
[0035] Specifically, the active ring seat 2 is made of 316L material, and the expansion sleeve 14 is made of 304 stainless steel material. The advantage is that the active ring seat 2 made of 316L material can improve the overall service life, and the expansion sleeve 14 made of 304 stainless steel is not easy to be corroded and damaged, thereby improving the overall practicality.
[0036] Working principle: When in use, the lip seal 1 8 and the O-ring 2 9 can not only seal the gap between the mechanical seal and the kettle body 7, but also move axially forward and backward to ensure the sealing performance and avoid leakage during use, which affects normal use. The design of the anti-rotation pin 6 can absorb the torque generated when the mechanical seal rotates, fix the outer flange of the mechanical seal, and prevent the outer flange of the mechanical seal from rotating relative to the kettle body 7, which affects normal use. The design of the sealing ring 16 can improve the sealing performance of the installation sleeve 1 and avoid leakage of the installation sleeve 1. The design of the sealing ring 2 17 can improve the sealing performance of the active ring seat 2. Through the design of the through groove 10, the connecting pipe 11 and the inlet 12, cooling water or leakage liquid can be put into the inlet 12 and then enter the through groove 10 from the connecting pipe 11 to achieve internal cooling. Through the design of the bolts 15, the outer flange and the expansion sleeve 14 can be fixedly installed, and the design of multiple bolts 15 can improve the overall stability and avoid the single bolt 15 from falling off easily, affecting the normal installation. The active ring seat 2 made of 316L material can improve the overall service life, and the expansion sleeve 14 made of 304 stainless steel is not easy to use and is easily corroded and damaged, thereby improving the overall practicality.
[0037] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.
Claims
1. A piston-type mechanical seal that allows large axial displacement, comprising a mounting sleeve (1), characterized in that: An active ring seat (2) is fixedly mounted on the outside of the mounting sleeve (1), a sealing structure (3) is arranged on the outside of the active ring seat (2), a bellows (4) is fixedly mounted on the outside of the sealing structure (3), a groove (5) is provided on the outside of the bellows (4), an anti-rotation pin (6) is arranged on the outside of the groove (5), a kettle body (7) is fixedly mounted on the outside of the bellows (4), a sealing ring 1 (8) is fixedly mounted on the outside of the bellows (4), a sealing ring 2 (9) is fixedly mounted on the outside of the bellows (4), and the sealing A through groove (10) is provided inside the structure (3), a connecting pipe (11) is provided at the bottom of the bellows (4), an inlet (12) is provided on the outside of the connecting pipe (11), an inner shell (13) is fixedly installed on the outside of the mounting sleeve (1), an expansion sleeve (14) is fixedly installed on the outside of the inner shell (13), a plurality of bolts (15) are fixedly installed on the outside of the expansion sleeve (14), a sealing ring 1 (16) is provided on the outside of the mounting sleeve (1), and a sealing ring 2 (17) is fixedly installed on the outside of the active ring seat (2).
2. A piston-type mechanical seal that allows large axial displacement according to claim 1, characterized in that: The sealing ring 1 (8) is a lip-shaped structure, and the sealing ring 2 (9) is an "O"-shaped structure.
3. A piston-type mechanical seal that allows large axial displacement according to claim 1, characterized in that: The anti-rotation pin (6) passes through the clamping groove (5) and extends to the interior of the kettle body (7); the clamping groove (5) is in a "circular" structure.
4. A piston-type mechanical seal that allows large axial displacement according to claim 1, characterized in that: The sealing ring 1 (16) is located on the left side of the mounting sleeve (1), and the sealing ring 2 (17) is located on the top of the active ring seat (2).
5. A piston-type mechanical seal that allows large axial displacement according to claim 1, characterized in that: The through groove (10), the connecting pipe (11) and the inlet (12) are connected to each other, and the through groove (10), the connecting pipe (11) and the inlet (12) are in one-to-one correspondence.
6. A piston-type mechanical seal that allows large axial displacement according to claim 1, characterized in that: The bolts (15) penetrate the outer flange and extend into the interior of the expansion sleeve (14), and a plurality of the bolts (15) are distributed in a ring shape.
7. A piston-type mechanical seal that allows large axial displacement according to claim 1, characterized in that: The active ring seat (2) is made of 316L material, and the expansion sleeve (14) is made of 304 stainless steel material.