Large-diameter detachable transmission structure
By adopting a large-diameter detachable transmission structure on a large-diameter low-pressure circulation water pump, including spring seat, moving ring, flat key and counterscrew, the problem of high milling cost and small contact area of the transmission part is solved, and more stable contact and convenient maintenance is achieved, extending the service life of the equipment and reducing maintenance costs.
Patent Information
- Application Number
- CN202411893278.6
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2024-12-20
- Publication Date
- 2025-03-21
AI Technical Summary
The unbalanced rotary mechanical sealing structure on the existing large-diameter low-pressure circulating water pump has problems such as high milling cost, small contact area, rapid wear, difficulty in repair, and damage caused by concentrated graphite ring stress.
It adopts a large diameter detachable transmission structure, including spring seat, moving ring, flat key and counterhead screw. Through the fastening of the flat key and counterhead screw and the anti-rotating groove, the rotating movement and sealing operation of the moving ring are achieved, and the wear flat key is easily replaced by a detachable design, reducing maintenance costs.
It improves the contact stability between the moving ring and the spring seat, extends the service life of the transmission structure, reduces maintenance costs, and avoids equipment damage caused by wear and stress concentration.
Smart Images
Figure CN119664912A_ABST
Abstract
Description
Technical Field
[0001] The present application relates to the technical field of mechanical seals, and in particular to a large-diameter detachable transmission structure. Background Art
[0002] Mechanical seal refers to a device that prevents fluid leakage by at least one pair of end faces perpendicular to the axis of rotation, which are kept in contact and slide relative to each other under the action of fluid pressure and the elastic force (or magnetic force) of the compensation mechanism and the cooperation of auxiliary seals. Unbalanced rotary mechanical seal structures are widely used in large-diameter low-pressure circulating water pumps, and their rotating ring components usually adopt the transmission style shown in Figures 1 and 2 below.
[0003] 1) Lug drive Reference Figure 1 The spring seat 1 and the dynamic ring 2 are both milled R arcs, which are tangentially contacted with each other to prevent rotation and have a certain centering tendency. Common problems include: high milling cost; small lug contact area causes rapid wear, and the entire lug needs to be replaced during repair; meanwhile, stress concentration on the graphite ring leads to breakage.
[0004] 2) Fork drive Reference Figure 2 The spring seat 1 and the moving ring 2 are milled at the corresponding positions to process the shift fork, and the surface contact of the milled part is used to prevent rotation, and the centering effect is poor. Common problems: milling of the spring seat 1 can easily cause deformation of thin-walled parts with large shaft diameters, causing the sealing ring to get stuck and affect floating performance. Summary of the invention
[0005] In order to improve the contact stability between the dynamic ring and the spring seat, the present application provides a large-diameter detachable transmission structure.
[0006] The large-diameter detachable transmission structure provided in this application adopts the following technical solution: A large-diameter detachable transmission structure comprises a spring seat, a dynamic ring, a flat key and a countersunk screw, wherein the spring seat is fixedly arranged on the transmission shaft, the flat key is arranged on the inner side of the spring seat through the countersunk screw, and an anti-rotation groove for installing the flat key is opened on the dynamic ring, wherein the anti-rotation groove faces the stationary ring side and passes through the dynamic ring.
[0007] Optionally, the flat key is provided with a through hole for a countersunk screw to pass through, the inner side of the spring seat is provided with a threaded hole connected to the through hole, the flat key is provided with a countersunk groove connected to the through hole, and the head of the countersunk screw is placed in the countersunk groove and is separated from the moving ring.
[0008] Optionally, the tightening direction of the countersunk screw is opposite to the direction of the centrifugal force generated by the countersunk screw due to the rotation of the transmission shaft.
[0009] Optionally, the threaded hole passes through the spring seat, and the countersunk screw is partially welded to the spring seat by plasma welding.
[0010] Optionally, the side wall of the anti-rotation groove facing the flat key is provided with a taper to form an inclined surface, so that when the moving ring rotates, the side wall of the flat key contacts the side wall of the anti-rotation groove.
[0011] Optionally, a key slot for installing a flat key is provided on the inner side of the spring seat, and the threaded hole is connected to the key slot.
[0012] Optionally, the spring seat is fixed to the transmission shaft by means of a fixing screw.
[0013] Optionally, the keyway depth is 1 / 4-1 / 3 of the flat key thickness, and the keyway depth is 1 / 5-1 / 4 of the spring seat thickness.
[0014] Optionally, chamfers are provided at the corners of the anti-rotation groove.
[0015] Optionally, the keyway width is equal to the flat key width.
[0016] In summary, the present application includes at least one of the following beneficial technical effects: 1. The spring seat rotates with the transmission shaft, and the flat key is fastened to the spring seat by a countersunk screw. The flat key cooperates with the anti-rotation groove of the moving ring to drive the moving ring to rotate together and perform sealing operations. Based on the basic principle of mechanical sealing, there is reciprocating micro-motion during operation, so the flat key position is a point prone to wear. Through the above detachable structural design, when the flat key is worn, it can be easily replaced to reduce maintenance costs. BRIEF DESCRIPTION OF THE DRAWINGS
[0017] Figure 1 It is a schematic diagram of the structure of lug transmission; Figure 2 It is a structural diagram of the fork transmission; Figure 3 This is a schematic diagram of the overall structure of a large-diameter detachable transmission structure according to an embodiment of the present application; Figure 4 It is a cross-sectional view of a spring seat in a large-diameter detachable transmission structure according to an embodiment of the present application; Figure 5 It is the flat key non-transmission state; Figure 6 This is the contact state during the traditional transmission of the flat key; Figure 7 This is a flat key transmission state in a large-diameter detachable transmission structure in an embodiment of the present application.
[0018] Explanation of the accompanying drawings: 1. Spring seat; 2. Moving ring; 3. Flat key; 4. Countersunk screw; 5. Transmission shaft; 6. Anti-rotation groove; 7. Mounting groove; 8. Spring; 9. Push ring; 10. Through hole; 11. Threaded hole; 12. Countersunk groove; 13. Keyway; 14. Fastening screw. DETAILED DESCRIPTION
[0019] The following is combined with Figure 3-7 This application is described in further detail.
[0020] The embodiment of the present application discloses a large diameter detachable transmission structure. Figure 3 and Figure 4 The large-diameter detachable transmission structure includes a spring seat 1, a dynamic ring 2, a flat key 3 and a countersunk screw 4. The spring seat 1 is fixedly arranged on the transmission shaft 5. The flat key 3 is arranged on the inner side of the spring seat 1 through the countersunk screw 4. The dynamic ring 2 is provided with an anti-rotation groove 6 for installing the flat key 3. The anti-rotation groove 6 faces the static ring side and penetrates the dynamic ring 2. The spring seat 1 is sleeved on the transmission shaft 5, and the spring seat 1 is provided with a mounting groove 7 for installing the dynamic ring 2. A spring 8 and a push ring 9 are arranged on the inner side of the spring seat 1. One end of the spring 8 is fixedly arranged on the bottom wall of the mounting groove 7, and the other side is fixedly arranged on the push ring 9. The push ring 9 abuts against the dynamic ring 2. The spring 8 pushes the push ring 9 to drive the dynamic ring 2 to have a tendency to move toward the static ring, thereby realizing mechanical sealing.
[0021] The spring seat 1 rotates with the transmission shaft 5, and the flat key 3 is fastened to the spring seat 1 by the countersunk screw 4. The flat key 3 cooperates with the anti-rotation groove 6 of the dynamic ring 2 to drive the dynamic ring 2 to rotate together and perform sealing operations; based on the basic principle of mechanical sealing, there is reciprocating micro-motion during operation, so the position of the flat key 3 is a point prone to wear. Through the above detachable structural design, when the flat key 3 is worn, it can be easily replaced to reduce maintenance costs. When replacing the flat key 3, first remove the dynamic ring 2 from the transmission shaft 5, separate the dynamic ring 2 from the flat key 3, then turn the countersunk screw 4, separate the countersunk screw 4 from the spring seat 1, and then remove the flat key 3 from the spring seat 1.
[0022] In the embodiment of the present application, a through hole 10 is provided on the flat key 3 for the countersunk screw 4 to pass through, a threaded hole 11 connected to the through hole 10 is provided on the inner side of the spring seat 1, and a countersunk groove 12 connected to the through hole 10 is provided on the flat key 3. The head of the countersunk screw 4 is placed in the countersunk groove 12 and is separated from the moving ring 2. When installing the flat key 3, the through hole 10 is aligned with the threaded hole 11, and then the countersunk screw 4 is passed through the through hole 10 and threadedly connected in the threaded hole 11, so that the flat key 3 is fixed on the spring seat 1, and the operation is simple and convenient.
[0023] Reference Figure 3 and Figure 4When the transmission shaft 5 drives the spring seat 1 to rotate, the countersunk screw 4 tends to rotate under the action of centrifugal force, causing the countersunk screw 4 to easily disengage from the threaded hole 11. Therefore, in the embodiment of the present application, the tightening direction of the countersunk screw 4 is opposite to the direction of the centrifugal force generated by the rotation of the transmission shaft 5 on the countersunk screw 4; the tightening direction of the countersunk screw 4 is opposite to the direction of the centrifugal force, so that the countersunk screw 4 is further tightened on the spring seat 1 under the action of the centrifugal force, thereby improving the fixing effect of the flat key 3.
[0024] Reference Figure 3 and Figure 4 In other embodiments, such as equipment with greater vibration intensity, the countersunk screw 4 is prone to failure. Therefore, in the embodiment of the present application, the threaded hole 11 passes through the spring seat 1, and the countersunk screw 4 is partially welded to the spring seat 1 by plasma welding.
[0025] Reference Figure 5 , after the flat key 3 is located in the anti-rotation groove 6, the flat key 3 and the side wall of the anti-rotation groove 6 are in a parallel state; Reference Figure 6 When the spring seat 1 drives the flat key 3 and the moving ring 2 to rotate, the flat key 3 has a tendency to deviate, and under the action of centrifugal force, the flat key 3 has a tendency to tilt. The force direction is shown by the arrow in the figure, which causes the flat key 3 to be in line contact with the anti-rotation groove 6, which can easily cause damage to the moving ring 2; Reference Figure 7 Therefore, in the embodiment of the present application, the side wall of the anti-rotation groove 6 facing the flat key 3 is provided with a taper to form an inclined surface, so that when the dynamic ring 2 rotates, the side wall of the flat key 3 contacts the side wall of the anti-rotation groove 6, and the force direction is shown by the arrow in the figure.
[0026] In the embodiment of the present application, a key slot 13 for installing the flat key 3 is opened on the inner side of the spring seat 1, and the threaded hole 11 is connected to the key slot 13; under the action of the key slot 13, it is convenient to install and position the flat key 3, thereby facilitating the installation of the flat key 3.
[0027] Reference Figure 3 and Figure 4 In the embodiment of the present application, the width of the keyway 13 is equal to the width of the flat key 3; when there is a gap between the flat key 3 and the keyway 13, when the spring seat 1 drives the dynamic ring 2 to rotate, it only transmits torque through the countersunk screw 4, which can easily cause the countersunk screw 4 to fail; when the width of the keyway 13 is equal to the width of the flat key 3, the torque transmission is transmitted through the countersunk screw 4 and the flat key 3, thereby facilitating the spring seat 1 to drive the dynamic ring 2 to rotate.
[0028] Reference Figure 3 and Figure 4 In the embodiment of the present application, the spring seat 1 is fixed on the transmission shaft 5 by means of a fastening screw 14 .
[0029] Reference Figure 3and Figure 4 In the embodiment of the present application, the depth of the keyway 13 is 1 / 4-1 / 3 of the thickness of the flat key 3, and the depth of the keyway 13 is 1 / 5-1 / 4 of the thickness of the spring seat 1; the milling part of the spring seat 1 is only the keyway 13 at the inner hole, which reduces the milling cost; at the same time, the depth of the milling keyway 13 is shallow, and there is basically no effect of machining deformation on the thin-walled spring seat 1.
[0030] Reference Figure 3 and Figure 4 In the embodiment of the present application, chamfers are provided at the corners of the anti-rotation groove 6 .
[0031] The implementation principle of a large-diameter detachable transmission structure in the embodiment of the present application is: The spring seat 1 rotates with the transmission shaft 5, and the flat key 3 is fastened to the spring seat 1 by the countersunk screw 4. The flat key 3 cooperates with the anti-rotation groove 6 of the dynamic ring 2 to drive the dynamic ring 2 to rotate together and perform sealing operations; based on the basic principle of mechanical sealing, there is reciprocating micro-motion during operation, so the position of the flat key 3 is a point prone to wear. Through the above detachable structural design, when the flat key 3 is worn, it can be easily replaced to reduce maintenance costs. When replacing the flat key 3, first remove the dynamic ring 2 from the transmission shaft 5, separate the dynamic ring 2 from the flat key 3, then turn the countersunk screw 4, separate the countersunk screw 4 from the spring seat 1, and then remove the flat key 3 from the spring seat 1.
[0032] The above are all preferred embodiments of the present application, and the protection scope of the present application is not limited thereto. Therefore, any equivalent changes made according to the structure, shape, and principle of the present application should be included in the protection scope of the present application.
Claims
1. A large-diameter detachable transmission structure, characterized in that: The invention comprises a spring seat (1), a moving ring (2), a flat key (3) and a countersunk screw (4); the spring seat (1) is fixedly arranged on a transmission shaft (5); the flat key (3) is arranged on the inner side of the spring seat (1) through the countersunk screw (4); an anti-rotation groove (6) for installing the flat key (3) is opened on the moving ring (2); the anti-rotation groove (6) faces the stationary ring side and penetrates the moving ring (2).
2. A large-diameter detachable transmission structure according to claim 1, characterized in that: The flat key (3) is provided with a through hole (10) for the countersunk screw (4) to pass through, the inner side of the spring seat (1) is provided with a threaded hole (11) connected to the through hole (10), the flat key (3) is provided with a countersunk groove (12) connected to the through hole (10), and the head of the countersunk screw (4) is placed in the countersunk groove (12) and is separated from the moving ring (2).
3. A large-diameter detachable transmission structure according to claim 2, characterized in that: The tightening direction of the countersunk screw (4) is opposite to the direction of the centrifugal force generated by the countersunk screw (4) due to the rotation of the transmission shaft (5).
4. A large-diameter detachable transmission structure according to claim 2, characterized in that: The threaded hole (11) passes through the spring seat (1), and the countersunk screw (4) is partially welded to the spring seat (1) by plasma welding.
5. The large-diameter detachable transmission structure according to claim 1, characterized in that: The side wall of the anti-rotation groove (6) facing the flat key (3) is provided with a taper to form an inclined surface, so that when the moving ring (2) rotates, the side wall of the flat key (3) contacts the side wall of the anti-rotation groove (6).
6. A large-diameter detachable transmission structure according to claim 2, characterized in that: A keyway (13) for installing a flat key (3) is provided on the inner side of the spring seat (1), and the threaded hole (11) is connected to the keyway (13).
7. The large-diameter detachable transmission structure according to claim 1, characterized in that: The spring seat (1) is fixed on the transmission shaft (5) by means of a fastening screw (14).
8. The large-diameter detachable transmission structure according to claim 6, characterized in that: The depth of the keyway (13) is 1 / 4-1 / 3 of the thickness of the flat key (3), and the depth of the keyway (13) is 1 / 5-1 / 4 of the thickness of the spring seat (1).
9. A large-diameter detachable transmission structure according to claim 5, characterized in that: The anti-rotation grooves (6) are all provided with chamfers at their corners.
10. A large-diameter detachable transmission structure according to claim 6, characterized in that: The width of the keyway (13) is equal to the width of the flat key (3).