A seal device for a floating ring

Abstract

This invention discloses a sealing device for a floating ring, relating to the field of sealing technology. The sealing device includes a housing, a floating ring seat, a floating ring, and a bellows assembly. When the device seals a rotating shaft, external fluid enters the pressure balance chamber inside the floating ring seat through a pressure feedback channel on the housing. Under high pressure, the fluid pressure in the pressure balance chamber acts on the back of the floating ring, offsetting the excessive clamping force of the floating ring and keeping it axially suspended and balanced. Under low pressure, the fluid pressure in the pressure balance chamber decreases, the back pressure of the fluid on the back of the floating ring weakens, and the bellows assembly maintains the axial closing force, ensuring a tight seal. This invention automatically adjusts the axial force according to changes in the sealing fluid pressure through the cooperation between the floating ring seat, the floating ring, and the bellows assembly, thus achieving an adaptive sealing effect.

Description

Technical Field

[0001] This invention relates to the field of sealing technology, specifically a sealing device for a floating ring. Background Technology

[0002] Floating ring seals, as a typical non-contact mechanical seal, play a crucial role in high-speed rotating machinery. This device primarily utilizes the narrow gap formed between the inner bore of the floating ring and the surface of the rotating shaft to construct a stable lubricating oil film through hydrodynamic effects, thereby effectively isolating the sealing medium. It is a key component ensuring the sealing integrity of core industrial rotating equipment.

[0003] Existing floating ring sealing devices still face significant technical bottlenecks under complex operating conditions. Traditional oil film balancing mechanisms often rely on a single fluid pressure distribution. During transient processes such as unit start-up and shutdown, and emergency braking, shaft speed and pressure fluctuate drastically, making the fluid lubricating oil film prone to instability. This can lead to severe axial movement or significant radial wobble of the floating ring. When faced with instantaneous impacts from external environmental pressure, existing sealing ring structures lack effective stress buffering and displacement response capabilities, which can easily cause abnormal friction and collision between the floating ring and the housing or shaft surface, resulting in damage to the sealing surface or even sealing failure. Therefore, designing a floating ring sealing device that can still achieve adaptive stability under pressure fluctuations has become a key technical problem that urgently needs to be solved in the current field. Summary of the Invention

[0004] The purpose of this invention is to provide a sealing device for a floating ring to solve the problem of the inability to adaptively seal under pressure fluctuations in the prior art.

[0005] To achieve the above objectives, the present invention provides the following technical solution: a sealing device for a floating ring, comprising a housing, a floating sealing assembly, and a corrugated assembly, wherein the corrugated assembly is disposed between the housing and the floating sealing assembly, and the floating sealing assembly comprises a floating ring seat and a floating ring; The floating ring seat is disposed inside the housing, and the floating ring is disposed inside the floating ring seat. A pressure feedback channel is provided inside the housing, and a pressure balance chamber is provided inside the floating ring seat. A through hole is provided on the end face of the floating ring seat. A limiting groove is provided circumferentially on the floating ring seat, and a limiting pin is provided on the limiting groove. The floating ring is slidably connected to the limiting pin. When the equipment performs sealing operations on the rotating shaft, external fluid enters the pressure feedback channel inside the housing, and then enters the pressure balance chamber through the through hole on the end face of the floating ring seat. When the pressure is high, the fluid velocity in the pressure feedback channel increases. At this time, a high-pressure fluid field is formed in the pressure balance chamber. This fluid pressure acts directly on the back of the floating ring. The back pressure direction is opposite to the direction of the fluid closing force on the sealing end face. The pressure balance chamber effectively counteracts the excessive clamping force applied to the floating ring by the high-pressure fluid. At this time, the floating ring maintains suspension balance in the axial direction. When the sealing system is under low pressure, the fluid pressure in the pressure balance chamber decreases or reduces synchronously. At this time, the fluid back pressure applied to the back of the floating ring weakens, and the axial closing force of the floating ring is mainly maintained by the preload of the bellows assembly. Since there is no pressure from the high-pressure fluid, the floating ring will not move axially, ensuring that the sealing pair maintains a tight fit under low-pressure conditions. This dynamic buffering allows the floating ring to automatically adjust the magnitude of the axial force according to the pressure changes of the sealing medium, thereby achieving dynamic adaptive sealing under different pressure environments. The limiting pin slides with the floating ring in the limiting groove, which not only allows the circumferential rotation of the floating ring and prevents the floating ring from rotating with the shaft and causing wear on the sealing surface, but also provides room for the slight axial movement of the floating ring. This allows the floating ring to automatically compensate for the positional deviation caused by shaft eccentricity, vibration, and wear on the sealing surface, and always maintain the fit of the sealing surface. While compensating for positional deviations, the bellows assembly ensures the sealing between the housing and the floating seal assembly, preventing media leakage.

[0006] The floating seal assembly also includes a pressure regulating component. The housing has a liquid inlet, and the pressure regulating component is located inside the pressure feedback channel. The pressure regulating component has a throttling orifice. When the equipment performs sealing operations on the rotating shaft, external fluid enters the pressure feedback channel from the liquid inlet. After passing through the throttling orifice, the fluid pressure is pre-adjusted before entering the pressure balance chamber. This limits the instantaneous flow rate of the fluid entering the pressure balance chamber, effectively absorbing the pressure shock generated during unit start-up and shutdown, and ensuring the stability of the fluid pressure in the pressure balance chamber.

[0007] A compensating sealing ring is provided on the mating end face between the floating ring seat and the floating ring. The chamber space of the pressure balance chamber extends axially to the back of the floating ring. During operation, the compensating sealing ring can prevent high-pressure fluid in the pressure balance chamber from leaking from the mating gap, ensuring the reliability of pressure regulation. At the same time, under high pressure, the compensating sealing ring can also seal and compensate for the relative floating between the floating ring and the floating ring seat, without restricting the axial adjustment action of the floating ring.

[0008] The inner wall of the floating ring seat is provided with a lubrication channel, and the inner wall of the floating ring is provided with a spiral dynamic pressure groove. The lubrication channel connects the pressure balance chamber and the spiral dynamic pressure groove. During operation, part of the pressure fluid in the pressure balance chamber flows into the spiral dynamic pressure groove through the lubrication channel, forming a dynamic pressure lubricating film between the inner wall of the floating ring and the rotating shaft. On the one hand, it can lubricate and cool the floating ring and the rotating shaft, reducing friction and wear. On the other hand, the supporting force generated by the dynamic pressure film can further improve the radial alignment ability of the floating ring, buffer the offset caused by the eccentric vibration of the rotating shaft, and further improve the stability of the sealing operation.

[0009] The depth of the spiral dynamic pressure groove decreases gradually along the fluid flow direction. After the fluid enters the spiral dynamic pressure groove from the pressure balance chamber, the groove depth is greater on the inlet side and gradually decreases on the outlet side. This gradient structure can cause the fluid pressure to gradually increase during the flow process, enhance the load-bearing capacity of the dynamic pressure liquid film, further improve the lubrication and support effect, and ensure the stability of the liquid film.

[0010] The housing includes an upper housing and a lower housing. The floating ring seat is disposed inside the upper housing. The upper housing is provided with an elastic groove. One end of the corrugated assembly is connected to the elastic groove, and the other end of the corrugated assembly is connected to the lower housing. When the equipment performs sealing operations on the rotating shaft, the vibration generated by the rotating shaft will be transmitted to the floating ring seat and the corrugated assembly in sequence through the floating ring. The corrugated assembly can absorb the vibration energy through its own elastic deformation, avoiding the vibration from being directly transmitted to the housing and causing resonance of the equipment. At the same time, in conjunction with the axial floating adjustment of the floating ring, it further buffers the impact caused by the rotation of the rotating shaft, improving the operational stability of the entire sealing device. The split design of the upper and lower housings facilitates the disassembly and maintenance of various components inside the sealing device, reducing the difficulty of maintenance and replacement operations.

[0011] The corrugated assembly includes an annular baffle and a bellows. The annular baffle is disposed in an elastic groove. One end of the bellows is engaged between the annular baffle and the upper housing, and the other end of the bellows is connected to the lower housing. The annular baffle can axially position the bellows to prevent it from shifting under pressure, ensuring that the direction of the bellows' elastic deformation is always axial, thus improving the stability of vibration absorption and impact buffering. The bellows' own extensibility can provide sufficient elastic compensation for the axial position adjustment of the floating seal assembly and also achieve sealing isolation between the upper and lower housings, preventing the sealing medium from leaking from the split connection of the housings.

[0012] It also includes a sealing connector, which is disposed between the upper housing and the floating ring seat. The sealing connector, as a filling component, maintains the continuity of the sealing interface between the upper housing and the floating ring seat, ensuring the leak-proof performance of the entire sealing system under complex working conditions.

[0013] Compared with the prior art, the beneficial effects of the present invention are: 1. This invention achieves adaptive stability of the sealing device under pressure fluctuations through the cooperation of a floating ring, a floating ring seat, a pressure balance chamber, and a bellows assembly. The fluid pressure acting on the back of the floating ring can be dynamically adjusted in real time according to pressure changes, effectively offsetting the excessive axial closing force under high pressure and avoiding mechanical wear of the sealing pair under high pressure. The bellows assembly ensures that the device can maintain good sealing fit under low pressure, greatly improving the working condition adaptability and service life of the sealing device.

[0014] 2. This invention features a spiral dynamic pressure groove circumferentially arranged on the inner wall of the floating ring, achieving efficient lubrication of the sealing interface. After the fluid is introduced into the spiral dynamic pressure groove, the fluid dynamic pressure bearing capacity is generated by the groove depth gradient structure, establishing a stable dynamic pressure lubricating oil film between the floating ring and the rotating shaft. This transforms solid friction into liquid lubrication, reducing frictional heat and wear, significantly improving the radial alignment capability of the floating ring and its resistance to eccentric vibration, preventing vibration from being directly transmitted to the housing, and ensuring the operational stability of the high-speed rotating unit in complex working environments. Attached Figure Description

[0015] Figure 1 This is an overall structural diagram of the present invention; Figure 2 This is an overall sectional view of the present invention; Figure 3 For the present invention Figure 2 A magnified view of a portion of region A in the middle; Figure 4 This is a partial structural diagram of the floating seal assembly of the present invention; Figure 5This is a partial cross-sectional view of the floating seal assembly of the present invention; Figure 6 For the present invention Figure 5 A magnified view of a portion of region B in the middle; Figure 7 This is a structural diagram of the floating ring of the present invention; Figure 8 This is a structural diagram of the corrugated component of the present invention.

[0016] In the diagram: 1. Housing; 11. Upper housing; 12. Lower housing; 13. Pressure feedback channel; 14. Elastic groove; 15. Liquid inlet; 2. Floating seal assembly; 21. Floating ring seat; 211. Pressure balance chamber; 213. Through hole; 214. Limiting groove; 215. Limiting pin; 216. Lubrication channel; 22. Floating ring; 221. Spiral dynamic pressure groove; 25. Compensating seal ring; 26. Pressure regulating component; 3. Bellows assembly; 31. Annular baffle; 32. Bellows; 4. Sealing connection component. Detailed Implementation

[0017] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0018] Example: Figures 1-8 As shown, the present invention provides a technical solution for a floating ring sealing device, comprising a housing 1, a floating sealing assembly 2, and a corrugated assembly 3. The housing 1 includes an upper housing 11 and a lower housing 12. The floating sealing assembly 2 includes a floating ring seat 21, which is disposed inside the upper housing 11. An elastic groove 14 is provided on the upper housing 11. One end of the corrugated assembly 3 is connected to the elastic groove 14, and the other end of the corrugated assembly 3 is connected to the lower housing 12. When the equipment performs sealing operations on the rotating shaft, the vibration generated by the rotating shaft is transmitted to the floating ring seat 21 and the corrugated assembly 3 in sequence through the floating ring 22. The corrugated assembly 3 can absorb the vibration energy through its own elastic deformation, avoiding the vibration from being directly transmitted to the housing 1 and causing resonance of the equipment. At the same time, in conjunction with the axial floating adjustment of the floating ring 22, it further buffers the impact caused by the rotation of the rotating shaft, improving the operational stability of the entire sealing device. The split design of the upper housing 11 and the lower housing 12 facilitates the disassembly and maintenance of various components inside the sealing device, reducing the difficulty of maintenance and replacement.

[0019] The floating seal assembly 2 also includes a floating ring 22, which is disposed inside the floating ring seat 21. A pressure feedback channel 13 is provided inside the housing 1, and a pressure balance chamber 211 is provided inside the floating ring seat 21. A through hole 213 is provided on the end face of the floating ring seat 21. A limiting groove 214 is provided circumferentially on the floating ring seat 21, and a limiting pin 215 is provided on the limiting groove 214. The floating ring 22 is slidably connected to the limiting pin 215. When the equipment performs sealing operations on the rotating shaft, external fluid enters the pressure feedback channel 13 inside the housing 1, and then passes through the end face of the floating ring seat 21. The fluid enters the pressure balance chamber 211 through the through hole 213. When under high pressure, the fluid velocity in the pressure feedback channel 13 increases. At this time, a high-pressure fluid field is formed in the pressure balance chamber 211. The fluid pressure acts directly on the back side of the floating ring 22. The back pressure direction is opposite to the direction of the fluid closing force on the sealing end face. The pressure balance chamber 211 effectively counteracts the excessive clamping force applied to the floating ring 22 by the high-pressure fluid. At this time, the floating ring 22 remains suspended in the axial direction. When the sealing system is under low pressure, the fluid pressure in the pressure balance chamber 211 decreases or drops synchronously. At this time, the fluid back pressure applied to the back of the floating ring 22 is reduced, and the axial closing force of the floating ring 22 is mainly maintained by the preload of the bellows assembly 3. Since there is no pressure from the high-pressure fluid, the floating ring 22 will not move axially, ensuring that the sealing pair maintains a tight fit under low-pressure conditions. This dynamic buffering allows the floating ring 22 to automatically adjust the magnitude of the axial force according to the pressure change of the sealing medium, thereby achieving dynamic adaptive sealing under different pressure environments. The limiting pin 215 slides in the limiting groove 214 with the floating ring 22, which can both prevent the floating ring 22 from rotating circumferentially and avoid wear on the sealing surface caused by the rotation of the floating ring 22 with the shaft, and provide room for the slight axial floating of the floating ring 22, so that the floating ring 22 can automatically compensate for the positional deviation caused by shaft eccentricity, vibration and wear of the sealing surface, and always maintain the fit of the sealing surface.

[0020] The floating seal assembly 2 also includes a pressure regulating component 26. The housing 1 has a liquid inlet 15. The pressure regulating component 26 is located inside the pressure feedback channel 13. The pressure regulating component 26 has a throttling orifice. When the equipment performs sealing operations on the rotating shaft, the external fluid enters the pressure feedback channel 13 from the liquid inlet 15. After the throttling and pressure reduction effect of the throttling orifice, the fluid pressure is pre-adjusted before entering the pressure balance chamber 211. This limits the instantaneous flow rate of the fluid entering the pressure balance chamber 211, effectively absorbing the pressure shock generated during the start-up and shutdown of the unit, and ensuring the stability of the fluid pressure in the pressure balance chamber 211.

[0021] A compensating seal ring 25 is provided on the mating end face between the floating ring seat 21 and the floating ring 22. The chamber space of the pressure balance chamber 211 extends axially to the back of the floating ring 22. During operation, the compensating seal ring 25 can prevent the high-pressure fluid in the pressure balance chamber 211 from leaking from the mating gap, ensuring the reliability of pressure regulation. At the same time, under high pressure, the compensating seal ring 25 can also seal and compensate for the relative floating between the floating ring 22 and the floating ring seat 21, without restricting the axial adjustment action of the floating ring 22.

[0022] The inner wall of the floating ring seat 21 is provided with a lubrication channel 216, and the inner wall of the floating ring 22 is provided with a spiral dynamic pressure groove 221. The groove depth of the spiral dynamic pressure groove 221 decreases gradually along the fluid flow direction. The lubrication channel 216 connects the pressure balance chamber 211 and the spiral dynamic pressure groove 221. During operation, part of the pressurized fluid in the pressure balance chamber 211 flows into the spiral dynamic pressure groove 221 through the lubrication channel 216. The groove depth is greater on the inlet side and gradually decreases on the outlet side. This gradient structure can promote the gradual increase of fluid pressure during flow, enhance the bearing capacity of the dynamic pressure liquid film, and form a dynamic pressure lubricating liquid film between the inner wall of the floating ring 22 and the rotating shaft. On the one hand, it can lubricate and cool the floating ring 22 and the rotating shaft, reducing friction and wear. On the other hand, the supporting force generated by the dynamic pressure liquid film can further improve the radial alignment ability of the floating ring 22, buffer the offset caused by the eccentric vibration of the rotating shaft, and further improve the stability of the sealing operation.

[0023] The bellows assembly 3 includes an annular baffle 31 and a bellows 32. The annular baffle 31 is disposed in the elastic groove 14. One end of the bellows 32 is clamped between the annular baffle 31 and the upper housing 11, and the other end of the bellows 32 is connected to the lower housing 12. The annular baffle 31 can axially position the bellows 32 to prevent the bellows 32 from shifting during the pressure process, ensuring that the direction of the elastic deformation of the bellows 32 is always along the axial direction, thereby improving the stability of vibration absorption and impact buffering. The expandable characteristics of the bellows 32 can provide sufficient elastic compensation for the axial position adjustment of the floating seal assembly 2, and can also achieve sealing isolation between the upper housing 11 and the lower housing 12 to prevent the sealing medium from leaking from the split connection of the housing.

[0024] It also includes a sealing connector 4, which is disposed between the upper housing 11 and the floating ring seat 21. As a filling component, the sealing connector 4 maintains the continuity of the sealing interface between the upper housing 11 and the floating ring seat 21, ensuring the leak-proof performance of the entire sealing system under complex working conditions.

[0025] Working principle of the invention: When the equipment starts, external fluid enters the housing 1 through the inlet 15 and first flows through the pressure regulator 26. The throttling orifice built into the pressure regulator 26 acts as a primary throttling and pressure reduction mechanism to absorb pressure fluctuations generated during start-up and shutdown. The adjusted fluid enters the pressure feedback channel 13 inside the housing 1 and is introduced into the pressure balance chamber 211 through the through hole 213 on the end face of the floating ring seat 21. Through the high-pressure fluid field in the pressure balance chamber 211, dynamic loading of the axial force on the back of the floating ring 22 is achieved.

[0026] Under high pressure conditions, the flow velocity in the pressure feedback channel 13 increases, and the back pressure in the pressure balance chamber 211 rises. This fluid pressure acts directly on the back side of the floating ring 22. The direction of the back pressure is opposite to the direction of the fluid closing force on the sealing end face, effectively offsetting the excessive clamping force generated by the high pressure fluid, so that the floating ring 22 maintains suspension balance in the axial direction. Under low pressure conditions, the compensation sealing ring 25 ensures that the high pressure fluid in the pressure balance chamber 211 does not leak from the mating gap. At this time, the closing force is mainly maintained by the pre-tightening force of the corrugated assembly 3, ensuring that the floating ring 22 fits tightly, and realizing the adaptive adjustment of the sealing device under different pressure environments.

[0027] Part of the pressurized fluid is discharged from the pressure balance chamber 211 through the lubrication channel 216 and flows into the spiral dynamic pressure groove 221. As the shaft rotates at high speed, the fluid pressure gradually increases from the inlet to the outlet under the action of the gradient groove depth structure of the spiral dynamic pressure groove 221. A stable dynamic pressure lubricating liquid film is built between the inner wall of the floating ring 22 and the shaft. The liquid film lubricates and cools the floating ring 22 and the shaft. The resulting support force further enhances the radial alignment capability of the floating ring 22.

[0028] During operation, the vibration generated by the rotating shaft is transmitted sequentially to the bellows assembly 3 through the floating ring 22 and the floating ring seat 21. The bellows assembly 3 effectively absorbs the vibration energy and prevents equipment resonance through the elastic expansion and contraction of the bellows 32 and the positioning and buffering of the annular baffle 31.

[0029] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the invention can be implemented in other specific forms without departing from its spirit or essential characteristics. Therefore, the embodiments should be considered in all respects as exemplary and non-limiting, and the scope of the invention is defined by the appended claims rather than the foregoing description. Thus, all variations falling within the meaning and scope of equivalents of the claims are intended to be included within the present invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

Claims

1. A sealing device for a floating ring, characterized in that: It includes a housing (1), a floating seal assembly (2) and a corrugated assembly (3), the corrugated assembly (3) being disposed between the housing (1) and the floating seal assembly (2), the floating seal assembly (2) including a floating ring seat (21) and a floating ring (22). The floating ring seat (21) is disposed inside the housing (1), the floating ring (22) is disposed inside the floating ring seat (21), the housing (1) has a pressure feedback channel (13) inside, the floating ring seat (21) has a pressure balance chamber (211) inside, the floating ring seat (21) has a through hole (213) on the end face of the floating ring seat (21), the floating ring seat (21) has a circumferentially provided limiting groove (214), the limiting groove (214) is provided with a limiting pin (215), and the floating ring (22) is slidably connected to the limiting pin (215).

2. The sealing device for a floating ring according to claim 1, characterized in that: The floating seal assembly (2) also includes a pressure regulating component (26). The housing (1) has a liquid inlet (15). The pressure regulating component (26) is located inside the pressure feedback channel (13). The pressure regulating component (26) has a throttling orifice.

3. A sealing device for a floating ring according to claim 1, characterized in that: A compensating sealing ring (25) is provided on the mating end face between the floating ring seat (21) and the floating ring (22), and the chamber space of the pressure balance chamber (211) extends axially to the back of the floating ring (22).

4. A sealing device for a floating ring according to claim 1, characterized in that: The inner wall of the floating ring seat (21) is provided with a lubrication channel (216) and the inner wall of the floating ring (22) is provided with a spiral dynamic pressure groove (221). The lubrication channel (216) connects the pressure balance chamber (211) and the spiral dynamic pressure groove (221).

5. A sealing device for a floating ring according to claim 4, characterized in that: The depth of the spiral dynamic pressure groove (221) decreases gradually along the fluid flow direction.

6. A sealing device for a floating ring according to claim 1, characterized in that: The housing (1) includes an upper housing (11) and a lower housing (12). The floating ring seat (21) is disposed inside the upper housing (11). An elastic slot (14) is provided on the upper housing (11). One end of the corrugated assembly (3) is connected to the elastic slot (14), and the other end of the corrugated assembly (3) is connected to the lower housing (12).

7. A sealing device for a floating ring according to claim 6, characterized in that: The corrugated assembly (3) includes an annular baffle (31) and a corrugated pipe (32). The annular baffle (31) is disposed in an elastic slot (14). One end of the corrugated pipe (32) is engaged between the annular baffle (31) and the upper housing (11). The other end of the corrugated pipe (32) is connected to the lower housing (12).

8. A sealing device for a floating ring according to claim 7, characterized in that: It also includes a sealing connector (4) disposed between the upper housing (11) and the floating ring seat (21).

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