Controllable deformation mechanical sealing ring

Abstract

The invention relates to a controllable deformation mechanical sealing ring, and belongs to the technical field of mechanical sealing, the controllable deformation mechanical sealing ring comprises a static ring, a movable ring and a movable ring sealing ring, the movable ring and the static ring are attached and rotate to form sealing, the face, attached to the static ring, of the movable ring is a sealing end face, and the movable ring sealing ring is arranged on the face, away from the static ring, of the movable ring. The mechanical seal has the effect of guaranteeing the service life of the mechanical seal.

Description

Technical Field

[0001] The present application relates to the technical field of mechanical seals, and in particular to a controllable deformation mechanical seal ring. Background Art

[0002] Mechanical seals are one of the shaft sealing methods for rotating equipment and are widely used due to their advantages such as low leakage and long service life. During the application of mechanical seals, the main factor affecting their operating status is the deformation of the sealing ring, which is usually manifested in the pressure deformation caused by the sealing fluid and the temperature deformation caused by the friction heat of the end face.

[0003] In the related art, a Chinese patent document with publication number CN105952902A discloses a mechanical seal, including an outer end cover, a sleeve sleeved outside a rotating shaft, a primary seal and a secondary seal located on the sleeve, the secondary seal being an upstream pumping mechanical seal, the upstream pumping mechanical seal including a static ring, a dynamic ring, an elastic component and a spring seat, the spring seat and the dynamic ring sleeved outside the sleeve, the elastic component located between the spring seat and the dynamic ring, the elastic component including a spring and a push ring, the push ring located between the spring and the dynamic ring, a static ring sealing ring is provided between the static ring and the outer end cover, a dynamic ring sealing ring is provided between the dynamic ring and the sleeve, and a sealing liquid inlet and a sealing liquid outlet are provided on the outer end cover outside the secondary seal.

[0004] In view of the above-mentioned related technologies, combined with Figure 1 The liquid force caused by the sealing fluid on the dynamic ring is composed of four parts: ①②③④. Due to the existence of liquid force ④, the liquid forces in the M area on the dynamic ring are balanced in the radial direction, so that this part is not deformed by the liquid force, while the rest of the dynamic ring is affected by the liquid force on the outer circle, resulting in uneven radial deformation of the dynamic ring. Figure 1 The cross section in the middle shows a deformation trend of flipping clockwise, and because the dynamic ring sealing end face is relatively weak, the deformation is more obvious. The sealing end face of the dynamic ring will show a divergent gap, which can easily cause rapid wear of the outer circle of the dynamic ring sealing end face, making the sealing end face non-parallel, and affecting the service life of the mechanical seal. Summary of the invention

[0005] In order to help ensure the service life of the mechanical seal, the present application provides a controllable deformation mechanical seal ring.

[0006] The present application provides a controllable deformation mechanical sealing ring adopts the following technical solution: A controllably deformable mechanical sealing ring comprises a stationary ring, a dynamic ring and a dynamic ring sealing ring. The dynamic ring and the stationary ring rotate in contact with each other to form a seal. The side where the dynamic ring and the stationary ring contact each other is a sealing end face. The dynamic ring sealing ring is arranged on the side of the dynamic ring away from the stationary ring.

[0007] Preferably, the inner diameter of the dynamic ring sealing ring is equal to the inner diameter of the dynamic ring.

[0008] Preferably, the controllably deformable mechanical sealing ring further comprises a stationary ring sealing ring, and the stationary ring sealing ring is arranged on a side of the stationary ring away from the dynamic ring.

[0009] Preferably, the median diameter of the static ring seal is equal to the outer diameter of the dynamic ring seal end face.

[0010] Preferably, the dynamic ring includes a friction portion, a connecting portion and an abutting portion which are arranged in sequence along a direction away from the static ring, the sealing end face is a side where the friction portion is in contact with the static ring, the dynamic ring sealing ring is arranged on a side of the abutting portion away from the static ring, the connecting portion and the abutting portion have the same inner diameter, and the outer diameter of the friction portion and the outer diameter of the abutting portion are both smaller than the outer diameter of the connecting portion.

[0011] Preferably, a plurality of grooves are formed on the outer wall of the connecting portion, and the plurality of grooves are spaced apart along the circumference of the connecting portion, and the grooves penetrate one end of the connecting portion close to the friction portion.

[0012] Preferably, the groove is arc-shaped.

[0013] Preferably, a plurality of transmission grooves are provided on the connecting part, and the plurality of transmission grooves are distributed at intervals along the circumference of the connecting part. The transmission grooves are used to cooperate with the transmission keys on the spring seat. The transmission grooves run through both ends of the connecting part, and the depth of the grooves is greater than the depth of the transmission grooves.

[0014] Preferably, each of the transmission grooves is aligned with the groove on the connecting portion, one end of the transmission groove close to the friction portion is connected to the aligned groove, and one end of the transmission groove away from the friction portion passes through the connecting portion.

[0015] Preferably, the controllable deformable mechanical sealing ring also includes a push ring for connecting to the spring, the push ring is located on the side of the dynamic ring away from the static ring, the dynamic ring sealing ring is located between the push ring and the abutment, and the push ring is respectively fitted with the outer circle side of the abutment and the side away from the static ring.

[0016] In summary, this application includes the following beneficial technical effects: By moving the dynamic ring seal to the outside of the dynamic ring, the outer circle of the dynamic ring is evenly subjected to the liquid force caused by the sealing fluid, so that the dynamic ring is always in uniform radial contraction, and the deformation of the dynamic ring seal end face is not affected by the change in the sealing fluid pressure, thereby achieving hydraulic balance, which helps to ensure the parallelism of the dynamic ring seal end faces, avoid excessive wear caused by local contact, and extend the service life of the mechanical seal. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a schematic diagram of the liquid force acting on the moving ring in the related technology.

[0018] Figure 2It is a schematic diagram of the structure of an embodiment of the present application.

[0019] Figure 3 It is a schematic diagram of the liquid force acting on the moving ring in the embodiment of the present application.

[0020] Figure 4 It is a schematic diagram of the overall structure of the dynamic ring in the embodiment of the present application.

[0021] Explanation of the reference numerals in the accompanying drawings: 1. static ring; 2. dynamic ring; 21. friction portion; 22. connecting portion; 23. abutting portion; 3. dynamic ring sealing ring; 4. sealing end face; 5. static ring sealing ring; 6. groove; 7. transmission groove; 8. push ring. DETAILED DESCRIPTION

[0022] The following combination Figure 2-Figure 4 This application is described in further detail.

[0023] The present application embodiment discloses a controllable deformation mechanical sealing ring. Figure 2 The controllable deformation mechanical sealing ring includes a static ring 1, a dynamic ring 2, a push ring 8 and a dynamic ring sealing ring 3. The dynamic ring 2 rotates in contact with the static ring 1 to form a seal. The side of the dynamic ring 2 that contacts the static ring 1 is a sealing end face 4. The push ring 8 is used to connect with the spring. The push ring 8 is located on the side of the dynamic ring 2 away from the static ring 1 and abuts against the dynamic ring 2. The dynamic ring sealing ring 3 is arranged on the side of the dynamic ring 2 away from the static ring 1. The dynamic ring sealing ring 3 is located between the push ring 8 and the dynamic ring 2. The inner wall of the dynamic ring 2 abuts against the outer wall of the sleeve.

[0024] In use, the dynamic ring 2 is in close contact with the end face of the static ring 1 under the action of the push ring 8 and the spring. By moving the dynamic ring seal 3 to the outside of the dynamic ring 2, the liquid force on the dynamic ring 2 is as follows: Figure 3 As shown, Figure 3 The arrow in the figure indicates the direction of the liquid force. Since the outer circle of the dynamic ring 2 is evenly subjected to the liquid force, the dynamic ring 2 is theoretically always in uniform radial contraction and uniform radial deformation. The deformation of the sealing end face 4 of the dynamic ring 2 is not affected by the pressure change of the sealing fluid, thereby achieving hydraulic balance, which helps to ensure the parallelism of the sealing end face 4 of the dynamic ring 2, avoid excessive wear caused by local contact, and effectively extend the service life of the mechanical seal.

[0025] Reference Figure 2 and Figure 4 , wherein the dynamic ring 2 includes a friction portion 21, a connecting portion 22 and an abutting portion 23, the friction portion 21, the connecting portion 22 and the abutting portion 23 are integrally formed in sequence along the direction away from the static ring 1, the sealing end face 4 is a side where the friction portion 21 is in contact with the static ring 1, the dynamic ring sealing ring 3 is fixedly arranged on a side of the abutting portion 23 away from the static ring 1, the dynamic ring sealing ring 3 is located between the push ring 8 and the abutting portion 23, and the push ring 8 is in abutment with the abutting portion 23.

[0026] Reference Figure 2 and Figure 4 Specifically, the inner diameters of the connecting portion 22 and the abutting portion 23 are the same, and the outer diameter of the abutting portion 23 is smaller than the outer diameter of the connecting portion 22; the inner diameter of the friction portion 21 is larger than the inner diameter of the connecting portion 22, and the outer diameter of the friction portion 21 is smaller than the outer diameter of the connecting portion 22. Furthermore, the outer diameter of the friction portion 21 is smaller than the outer diameter of the abutting portion 23. Two stepped grooves are provided on one side of the push ring 8 close to the dynamic ring 2. The stepped groove on the inner side is used to install the dynamic ring seal 3, and the stepped groove on the outer side facilitates the push ring 8 to fit with the outer circumferential side of the abutting portion 23 and the side of the abutting portion 23 away from the static ring 1, respectively, which helps to limit the dynamic ring 2 in the axial and radial directions.

[0027] Reference Figure 2 The inner diameter of the dynamic ring seal 3 is equal to the inner diameter of the dynamic ring 2, and the middle diameter of the dynamic ring seal 3 is equal to the inner diameter of the sealing end surface 4 on the friction part 21, which helps to improve the sealing between the dynamic ring 2 and the shaft sleeve.

[0028] Reference Figure 2 The mechanical seal ring also includes a stationary ring seal 5, which is fixedly arranged on a side of the stationary ring 1 away from the dynamic ring 2. Furthermore, the middle diameter of the stationary ring seal 5 is equal to the outer diameter of the sealing end face 4 on the friction portion 21. In actual use, the end face pressure deformation of the stationary ring 1 is often ignored. However, according to a large number of tests, in large-diameter seals, the end face deformation of the silicon carbide stationary ring 1 will affect the contact state of the sealing end face 4. In the present application, the position of the stationary ring seal 5 is designed so that its sealing point has the same outer diameter as the sealing end face 4 of the dynamic ring 2, so that the liquid pressure of the stationary ring 1 in the axial direction can be balanced, and the radial liquid pressure can be withstood only by its mechanical strength, which helps to make the deformation of the sealing end face of the stationary ring 1 tend to be parallel, so as to cooperate with the sealing end face 4 of the dynamic ring 2 to ensure the service life of the mechanical seal.

[0029] Reference Figure 2 and Figure 4 A plurality of grooves 6 are formed on the outer circumferential side of the connecting portion 22 , and the plurality of grooves 6 are evenly spaced along the circumference of the connecting portion 22 . The grooves 6 are located at one end of the connecting portion 22 close to the friction portion 21 and penetrate the other end of the connecting portion 22 close to the friction portion 21 .

[0030] On the basis of the hydraulic balance of the dynamic ring 2, the multiple grooves 6 contract radially under the action of the liquid pressure, and the deformation process will be transmitted to the sealing end face 4 of the friction part 21 to form a weak wave surface deformation, which can improve the lubrication state of the sealing end face 4 of the dynamic ring 2 to a certain extent, but because the deformation is small, it is not enough to cause the leakage of the seal to increase. When the lubrication state of the sealing end face 4 is not good enough, the temperature rises, and the wave surface deformation increases. At this time, the sealing leakage will increase, and more sealing fluid enters the sealing end face 4, thereby achieving a better lubrication state of the sealing end face 4, so that the temperature of the sealing end face 4 is reduced, and the wave surface deformation is reduced until a new equilibrium state is reached. Through the above principle, the temperature-controlled deformation of the dynamic ring 2 can be achieved to ensure the service life of the mechanical seal. In addition, the groove 6 is opened on the connecting part 22, which is not only convenient for processing, but also does not damage the strength of the sealing end face 4. At the same time, because the wave surface deformation formed by the transmission to the sealing end face 4 is small, the fluid dynamic pressure effect at the sealing end face 4 is not obvious, so that the sealing end face 4 is less affected by the viscosity of the sealing fluid, and is not limited by the line running speed, and can be widely used.

[0031] Reference Figure 4 Specifically, the number, depth and width of the grooves 6 are set according to the size of the dynamic ring 2 to control the deformation of the end surface.

[0032] Reference Figure 4 The groove 6 is in an arc shape. On the one hand, the arc-shaped groove body is convenient for processing. On the other hand, compared with other shapes, the arc-shaped groove 6 can avoid stress concentration, has the least effect on the strength of the dynamic ring 2, and has relatively smooth deformation.

[0033] Reference Figure 2 and Figure 4 A plurality of transmission grooves 7 are provided on the connection portion 22, and the plurality of transmission grooves 7 are evenly spaced along the circumference of the connection portion 22. The transmission grooves 7 are used to cooperate with the transmission keys on the spring seat. The depth of the groove 6 is greater than the depth of the transmission groove 7. The depth of the groove 6 and the depth of the transmission groove 7 refer to the lengths along the radial direction of the dynamic ring 2, respectively, which helps to control the deformation of the sealing end face 4 of the dynamic ring 2 to a few tenths of a micron, so as to realize temperature-controllable deformation of the sealing end face 4 on the dynamic ring 2.

[0034] Reference Figure 2 and Figure 4 Specifically, the number of the transmission grooves 7 is less than the number of the grooves 6, and each transmission groove 7 is aligned with the groove 6 on the connecting portion 22, the end of the transmission groove 7 close to the friction portion 21 is connected to the aligned groove 6, and the end of the transmission groove 7 away from the friction portion 21 passes through the connecting portion 22. By arranging the transmission groove 7 at a position aligned with the groove 6, the connecting portion 22 has only a plurality of grooves 6 arranged evenly at one end close to the friction portion 21, which helps to ensure that a uniform weak wave surface deformation is formed at the sealing end surface 4 of the friction portion 21.

[0035] The implementation principle of the embodiment of the present application is as follows: during use, the dynamic ring 2 makes the sealing end face 4 tightly contact with the end face of the static ring 1 under the action of the push ring 8 and the spring, and the dynamic ring sealing ring 3 is moved to the outside of the dynamic ring 2 so that the liquid force on the outer circle of the dynamic ring 2 is uniform, so that the dynamic ring 2 is always in radial uniform contraction, the dynamic ring 2 is radially uniformly deformed, and the deformation of the sealing end face 4 on the friction part 21 is not affected by the change of the sealing fluid pressure, thereby achieving hydraulic balance, thereby helping to ensure the parallelism of the sealing end face 4 of the dynamic ring 2, avoiding excessive wear caused by local contact, and effectively extending the service life of the mechanical seal.

[0036] The position of the stationary ring seal 5 is designed so that its middle diameter is the same as the outer diameter of the sealing end face 4 of the dynamic ring 2, so that the liquid pressure of the stationary ring 1 in the axial direction can be balanced and the sealing end face 4 of the stationary ring 1 can be deformed to be parallel so as to cooperate with the sealing end face 4 of the dynamic ring 2.

[0037] On the basis of the hydraulic balance of the dynamic ring 2, multiple grooves 6 shrink radially under the action of liquid pressure, and the deformation process will be transmitted to the sealing end face 4 of the dynamic ring 2 to form a slight wave surface deformation, which improves the lubrication state of the sealing surface of the dynamic ring 2 to a certain extent, but the deformation is not small enough to cause an increase in the sealing leakage; when the lubrication state of the sealing end face 4 is not good enough and the temperature rises, the wave surface deformation increases, and the sealing leakage will increase at this time, and more sealing fluid enters the sealing end face 4, thereby achieving a better sealing lubrication state, reducing the temperature of the sealing end face 4, and reducing the wave surface deformation until a new equilibrium state is reached, thereby realizing adaptive control of the temperature deformation of the dynamic ring 2, so as to improve the contact state of the sealing end face 4, and further ensure the service life of the mechanical seal.

[0038] 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 controllable deformation mechanical sealing ring, characterized in that: The invention comprises a stationary ring (1), a dynamic ring (2) and a dynamic ring sealing ring (3); the dynamic ring (2) and the stationary ring (1) are fitted and rotated to form a seal; the side of the dynamic ring (2) that fits the stationary ring (1) is a sealing end face (4); and the dynamic ring sealing ring (3) is arranged on a side of the dynamic ring (2) that is away from the stationary ring (1).

2. The controllable deformation mechanical sealing ring according to claim 1, characterized in that: The inner diameter of the dynamic ring seal (3) is equal to the inner diameter of the dynamic ring (2).

3. The controllable deformation mechanical sealing ring according to claim 1, characterized in that: The controllably deformable mechanical sealing ring further comprises a stationary ring sealing ring (5), wherein the stationary ring sealing ring (5) is arranged on a side of the stationary ring (1) away from the dynamic ring (2).

4. The controllable deformation mechanical sealing ring according to claim 3, characterized in that: The median diameter of the static ring seal (5) is equal to the outer diameter of the sealing end surface (4) of the dynamic ring (2).

5. A controllably deformable mechanical seal ring according to any one of claims 1 to 4, characterized in that: The dynamic ring (2) comprises a friction portion (21), a connecting portion (22) and an abutting portion (23) which are arranged in sequence along a direction away from the static ring (1); the sealing end face (4) is a side where the friction portion (21) is in contact with the static ring (1); the dynamic ring sealing ring (3) is arranged on a side of the abutting portion (23) away from the static ring (1); the inner diameters of the connecting portion (22) and the abutting portion (23) are the same; the outer diameters of the friction portion (21) and the abutting portion (23) are both smaller than the outer diameter of the connecting portion (22).

6. The controllably deformable mechanical seal ring according to claim 5, characterized in that: A plurality of grooves (6) are provided on the outer wall of the connecting portion (22), and the plurality of grooves (6) are distributed at intervals along the circumference of the connecting portion (22), and the grooves (6) penetrate one end of the connecting portion (22) close to the friction portion (21).

7. The controllably deformable mechanical seal ring according to claim 6, characterized in that: The groove (6) is in an arc shape.

8. The controllably deformable mechanical seal ring according to claim 6, characterized in that: The connecting portion (22) is provided with a plurality of transmission grooves (7), the plurality of transmission grooves (7) being distributed at intervals along the circumference of the connecting portion (22), the transmission grooves (7) being used to cooperate with the transmission keys on the spring seat, and the depth of the groove (6) being greater than the depth of the transmission grooves (7).

9. The controllably deformable mechanical seal ring according to claim 8, characterized in that: Each transmission groove (7) is aligned with a groove (6) on the connecting portion (22); an end of the transmission groove (7) close to the friction portion (21) is connected to the aligned groove (6); and an end of the transmission groove (7) away from the friction portion (21) passes through the connecting portion (22).

10. The controllably deformable mechanical seal ring according to claim 5, characterized in that: The controllably deformable mechanical sealing ring also includes a push ring (8) for connecting to a spring, wherein the push ring (8) is located on the side of the dynamic ring (2) away from the static ring (1), and the dynamic ring sealing ring (3) is located between the push ring (8) and the abutment portion (23). The push ring (8) is respectively in contact with the outer circumferential side of the abutment portion (23) and the side away from the static ring (1).

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