Mechanical sealing device
By introducing a transition ring into the mechanical sealing device and controlling the rotation speed through gear meshing, the wear problem during high-speed operation of the pump is solved, and the reliability of mechanical seal is improved.
Patent Information
- Application Number
- CN202422168084.1
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-09-05
- Publication Date
- 2025-07-22
- Estimated Expiration
- 2034-09-05
AI Technical Summary
The existing mechanical sealing devices are prone to damage when the pump speed is high, because the relative speed between the moving and static rings is faster, resulting in severe frictional heat generation and wear.
A transition ring is arranged between the moving ring and the static ring. The speed of the transition ring is between the moving ring and the static ring. The rotation speed is controlled by gear meshing, so that the relative speed between adjacent components is within a reasonable range, reducing frictional heat generation and wear.
It greatly reduces the mechanical seal wear of the pump when running at high speed, and improves the reliability of the pump at high speeds.
Smart Images
Figure CN223136954U_ABST
Abstract
Description
Technical Field
[0001] The utility model belongs to the technical field of mechanical seals for pumps, and particularly relates to a mechanical seal device. Background Art
[0002] A mechanical seal is a device that prevents fluid leakage and is composed of at least a pair of end faces perpendicular to the rotation axis. Under the action of fluid pressure and the elastic force (or magnetic force) of the compensation mechanism, and with the cooperation of auxiliary seals, they remain in contact and slide relative to each other.
[0003] The existing mechanical seal device has a simple structure and is mostly composed of a stationary ring, a rotating ring, a spring seat, and a spring. During installation, the stationary ring is abutted against the pump body, the rotating ring and the stationary ring are abutted against each other, the rotating ring and the spring seat are sleeved on the pump shaft, the spring is arranged between the rotating ring and the spring seat, and the rotating ring and the spring seat rotate with the pump shaft, while the stationary ring is fixed. The pump body is sealed by relying on the sealing performance between the stationary ring and the rotating ring. The existing mechanical seal is prone to damage when the pump speed is relatively high. The reason is that when the pump speed is relatively high, the relative rotational speed between the rotating ring and the stationary ring is relatively fast, and both the heat generated by friction and the degree of wear increase exponentially. Therefore, the mechanical seal is prone to damage at this time. Summary of the Utility Model
[0004] In order to solve the problem that the mechanical seal is prone to damage when the pump speed is high, the utility model provides a more reliable mechanical seal device. The utility model sets a transition ring between the rotating ring and the stationary ring. The transition ring is in contact with the rotating ring and the stationary ring respectively. The rotational speed of the transition ring is between the two, so the relative rotational speed is greatly reduced, and thus the heat generated by friction and the degree of wear are greatly reduced.
[0005] The technical solution provided by the utility model is: a mechanical seal device, including a pump body, a pump shaft, and a sealing end cover. The sealing end cover is fixedly and sealingly connected to the end of the pump body. An axle sleeve is fixedly and sealingly sleeved on the pump shaft, and the axle sleeve rotates with the pump shaft. A rotating ring is fixedly and sealingly arranged with the axle sleeve. A stationary ring is slidably and sealingly arranged with the sealing end cover. A spring is arranged between the stationary ring and the sealing end cover. Under the elastic force of the spring, the stationary ring has a tendency to abut against the rotating ring. The axle sleeve is provided with gear teeth A. A transmission shaft is arranged between the sealing end cover and the pump body. A gear A and a gear B that rotate with the shaft are fixedly installed on the transmission shaft. The diameter of gear A is larger than that of gear B. Gear A meshes with the gear teeth A on the axle sleeve. A transition ring is arranged on the pump shaft between the rotating ring and the stationary ring. The two sides of the transition ring are respectively in contact with the rotating ring and the stationary ring. The transition ring can rotate circumferentially and slide axially relative to the pump shaft. The outer side of the transition ring is provided with gear teeth B. The diameter of gear teeth B is larger than that of gear teeth A. Gear B meshes with the gear teeth B on the transition ring, so that the rotational speed of the transition ring is lower than that of the axle sleeve, that is, the rotational speed of the transition ring is lower than that of the rotating ring.
[0006] A further technical solution is that a rotating bearing A is arranged between the transition ring and the pump shaft.
[0007] A further technical solution is that a rotating bearing B is arranged between the transmission shaft and the sealing end cover, and a rotating bearing C is arranged between the transmission shaft and the pump body.
[0008] A further technical solution is that a sealing sleeve is also installed on the shaft sleeve at the end where the dynamic ring is installed. The sealing sleeve is fixedly connected to the shaft sleeve. A sealing ring is arranged between the sealing sleeve and the dynamic ring, and a sealing ring is arranged between the dynamic ring and the shaft sleeve.
[0009] A further technical solution is that a rotating bearing D is arranged between the shaft sleeve and the pump body.
[0010] In the utility model, a transition ring is arranged between the dynamic ring and the static ring. The two ends of the transition ring are respectively abutted against the dynamic ring and the static ring. The rotating speed of the transition ring is lower than that of the dynamic ring and higher than that of the static ring. The rotating speeds of the static ring, the transition ring, and the dynamic ring increase step by step. Therefore, the relative rotating speed between every two adjacent ones is within a reasonable range, reducing the severe wear caused by too fast relative rotating speed, greatly reducing the mechanical seal wear of the pump during high-speed operation, and improving the reliability of the pump at high rotating speeds. BRIEF DESCRIPTION OF THE DRAWINGS
[0011] Figure 1 It is a schematic structural diagram of the utility model.
[0012] In the figure: 1. Pump shaft; 2. Pin; 3. Spring; 4. Sealing end cover; 5. Static ring; 6. Transition ring; 7. Dynamic ring; 8. Sealing ring; 9. Shaft sleeve; 10. Rotating bearing D; 11. Rotating bearing C; 12. Transmission shaft; 13. Gear A; 14. Sealing sleeve; 15. Gear B; 16. Rotating bearing A; 17. Rotating bearing B; 18. Pump body. DETAILED DESCRIPTION OF THE EMBODIMENTS
[0013] In order to enable those skilled in the art to better understand the solution of the utility model, the technical solutions in the embodiments of the utility model will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the utility model. Obviously, the described embodiments are only a part of the embodiments of the utility model, rather than all the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by those of ordinary skill in the art without making creative efforts shall fall within the protection scope of the utility model.
[0014] This embodiment includes a pump body 18, a pump shaft 1, and a sealing end cover 4. The sealing end cover 4 is fixedly and sealingly connected to the end of the pump body 18. A sealing sleeve 14 is fixedly installed on the pump shaft 1 and is equipped with a bush 9. The bush 9 rotates with the pump shaft 1. A moving ring 7 is fixedly and sealingly arranged with the bush 9. A stationary ring 5 is slidably and sealingly arranged with the sealing end cover 4. A spring 3 is arranged between the stationary ring 5 and the sealing end cover 4. Under the elastic force of the spring 3, the stationary ring 5 has a tendency to abut against the moving ring 7. The pump body 18 is sealed by relying on the sealing performance between the stationary ring 5 and the moving ring 7. The stationary ring 5 and the sealing end cover 4 are connected by a pin 2 to prevent the stationary ring 5 from rotating relative to the sealing end cover 4. The above are the technical features that already exist in the prior art and will not be elaborated here.
[0015] The innovation of this embodiment lies in that: the bush 9 is provided with gear teeth A. A transmission shaft 12 is arranged between the sealing end cover 4 and the pump body 18. The transmission shaft 12 is parallel to the pump shaft 1. A rotating bearing B17 is arranged between the transmission shaft 12 and the sealing end cover 4. A rotating bearing C11 is arranged between the transmission shaft 12 and the pump body 18. The transmission shaft 12 can rotate freely relative to the sealing end cover 4 and the pump body 18. A gear A13 and a gear B15 that rotate with the shaft are fixedly installed on the transmission shaft 12. The diameter of the gear A13 is larger than that of the gear B15. The gear A13 meshes with the gear teeth A on the bush 9. A transition ring 6 is arranged on the pump shaft 1 between the moving ring 7 and the stationary ring 5. Both sides of the transition ring 6 abut against the moving ring 7 and the stationary ring 5 respectively. A rotating bearing A16 is arranged between the transition ring 6 and the pump shaft 1. The transition ring 6 can rotate circumferentially and slide axially relative to the pump shaft 1. The outer side of the transition ring 6 is provided with gear teeth B. The diameter of the gear teeth B is larger than that of the gear teeth A. The gear B15 meshes with the gear teeth B on the transition ring 6, so that the rotational speed of the transition ring 6 is lower than that of the bush 9, that is, the rotational speed of the transition ring 6 is lower than that of the moving ring 7. In this embodiment, the stationary ring 5 is stationary. The rotational speeds of the stationary ring 5, the transition ring 6, and the moving ring 7 increase gradually. Therefore, the relative rotational speed between every two adjacent ones is within a reasonable range, reducing the severe wear caused by too high relative rotational speed, greatly reducing the mechanical seal wear of the pump during high-speed operation, and improving the reliability of the pump at high rotational speeds.
[0016] In order to improve the sealing performance between the moving ring 7 and the bush 9, a sealing sleeve 14 is also installed on the bush 9 at the end where the moving ring 7 is installed. The sealing sleeve 14 is fixedly connected to the bush 9. A sealing ring 8 is arranged between the sealing sleeve 14 and the moving ring 7, and a sealing ring 8 is arranged between the moving ring 7 and the bush 9. The sealing ring 8 is press-fitted between the moving ring 7 and the bush 9. The sealing performance of the press-fitted sealing ring 8 is better. Therefore, the sealing performance between the moving ring 7 and the bush 9 in this embodiment is better.
[0017] A rotating bearing D10 is provided between the shaft sleeve 9 and the pump body 18. The rotating bearing D10 has a certain anti-vibration effect on the rotation of the pump shaft 1, reducing the adverse impact of the vibration of the pump shaft 1 on the mechanical seal.
Claims
1. A mechanical seal device, comprising a pump body (18), a pump shaft (1) and a sealing end cover (4). The sealing end cover (4) is fixedly and sealingly connected to the end of the pump body (18). A sealing sleeve (14) is fixedly installed on the pump shaft (1) and is equipped with a shaft sleeve (9). A moving ring (7) is fixedly and sealingly arranged with the shaft sleeve (9). A stationary ring (5) is slidably and sealingly arranged with the sealing end cover (4). A spring (3) is arranged between the stationary ring (5) and the sealing end cover (4). Under the elastic force of the spring (3), the stationary ring (5) has a tendency to abut against the moving ring (7). It is characterized in that: The described shaft sleeve (9) is provided with gear teeth A. A transmission shaft (12) is arranged between the sealing end cover (4) and the pump body (18). A gear A (13) and a gear B (15) that rotate with the shaft are fixedly installed on the transmission shaft (12). The diameter of the gear A (13) is larger than that of the gear B (15). The gear A (13) meshes with the gear teeth A on the shaft sleeve (9). A transition ring (6) is arranged on the pump shaft (1) between the dynamic seal ring (7) and the static seal ring (5). The two sides of the transition ring (6) are respectively in abutment with the dynamic seal ring (7) and the static seal ring (5). The transition ring (6) can rotate circumferentially and slide axially relative to the pump shaft (1). The outer side of the transition ring (6) is provided with gear teeth B. The diameter of the gear teeth B is larger than that of the gear teeth A. The gear B (15) meshes with the gear teeth B on the transition ring (6), so that the rotational speed of the transition ring (6) is lower than that of the shaft sleeve (9), that is, the rotational speed of the transition ring (6) is lower than that of the dynamic seal ring (7).
2. The mechanical seal device according to claim 1, characterized in that: A rotating bearing A (16) is arranged between the transition ring (6) and the pump shaft (1).
3. A mechanical seal device according to claim 1, characterized in that: A rotating bearing B (17) is arranged between the transmission shaft (12) and the sealing end cover (4). A rotating bearing C (11) is arranged between the transmission shaft (12) and the pump body (18).
4. A mechanical seal device according to claim 1, characterized in that: A sealing sleeve (14) is further installed on the shaft sleeve (9) at the end where the dynamic seal ring (7) is installed. The sealing sleeve (14) is fixedly connected to the shaft sleeve (9). A sealing ring (8) is arranged between the sealing sleeve (14) and the dynamic seal ring (7). A sealing ring (8) is arranged between the dynamic seal ring (7) and the shaft sleeve (9).
5. A mechanical seal device according to claim 1, characterized in that: A rotating bearing D (10) is arranged between the shaft sleeve (9) and the pump body (18).