Search

CN-121977073-A - Automatic compensation rotary sealing device, method and device assembling method

CN121977073ACN 121977073 ACN121977073 ACN 121977073ACN-121977073-A

Abstract

The invention relates to the technical field of dynamic sealing, and discloses an automatic compensation rotary sealing device, a method and a device assembling method, wherein the device comprises a static ring assembly, a rotary sealing device and a rotary sealing device, wherein the static ring assembly is used for being fixed on the end face of a device shell and providing a static sealing reference surface; the dynamic ring assembly is sleeved in the static ring assembly and forms axial and radial dynamic seal fit with the static ring assembly to form a main sealing surface, the supporting and positioning assembly is movably arranged between the static ring assembly and the dynamic ring assembly in a supporting mode and is linked with the dynamic ring assembly and used for bearing radial load of the dynamic ring assembly and ensuring coaxiality of the dynamic ring assembly and the static ring assembly when rotating, and the compensating assembly is connected with the dynamic ring assembly and used for applying pretightening force towards the static ring assembly along the axial direction of the dynamic ring assembly so as to realize automatic abrasion compensation. The clearance generated by abrasion of the sealing end face is counteracted in real time, and the radial stability and the coaxiality are maintained, so that the close fitting of the sealing pair is automatically maintained in long-term operation, and the problems of expanding the sealing clearance and the like are solved.

Inventors

  • ZHU XIAOLONG
  • XU ZHENGWEI
  • YE XIN
  • WU JIAWEI
  • DENG JIAJUN
  • HU QIRUI

Assignees

  • 湖南国天电子科技有限公司

Dates

Publication Date
20260505
Application Date
20260227

Claims (10)

  1. 1. An automatically compensating rotary seal device, comprising: a stationary ring assembly (100) for securing to an end face of the equipment housing and providing a stationary seal datum; The movable ring assembly (200) is sleeved in the static ring assembly (100) and forms axial and radial dynamic seal fit with the static ring assembly (100) to form a main sealing surface; the support positioning assembly (300) is movably arranged between the static ring assembly (100) and the dynamic ring assembly (200) in a supporting manner, is linked with the dynamic ring assembly (200), and is used for bearing radial load of the dynamic ring assembly (200) and ensuring coaxiality of the dynamic ring assembly (200) and the static ring assembly (100) during rotation; and the compensation assembly (400) is connected with the movable ring assembly (200) and is used for applying a pretightening force towards the static ring assembly (100) to the movable ring assembly (200) along the axial direction so as to realize automatic abrasion compensation.
  2. 2. The self-compensating rotary seal device of claim 1, wherein the stationary ring assembly (100) comprises a rotary stationary ring (101); The rotary fixed ring (101) comprises a cylinder shell (1011), an outer edge plate (1012) and an inner ring plate (1013), wherein a first end of the cylinder shell (1011) is used for being spliced and assembled into the equipment shell; the outer wall surface of the cylinder shell (1011) extends outwards along the radial direction to form an outer edge plate (1012), and the outer edge plate (1012) is used for being axially attached and connected with the end surface of the equipment shell; the inner wall surface of the cylinder shell (1011) extends inwards along the radial direction to form an inner ring plate (1013), and the inner ring plate (1013) is used for being inserted through the movable ring assembly (200) and is movably matched with the movable ring assembly (200) through the supporting and positioning assembly (300).
  3. 3. The automatic compensating rotary seal device of claim 2, wherein the stationary ring assembly (100) further comprises a stationary seal ring (102), the stationary seal ring (102) being disposed on the abutment surface of the outer rim plate (1012) and/or the outer sidewall of the cylindrical housing (1011).
  4. 4. The automatic compensating rotary seal device of claim 2, wherein the moving ring assembly (200) comprises a rotating shaft (201), a front slip ring (202), a rear slip ring (203), and a half ring (204); The rotary shaft (201) penetrates the inner cavity of the cylinder shell (1011) from the second end of the cylinder shell (1011) and is movably matched with the inner ring plate (1013) through the supporting and positioning assembly (300); The front slip ring (202) and the rear slip ring (203) are sequentially arranged in the inner cavity of the cylinder shell (1011) from the first end of the cylinder shell (1011) and sleeved outside the rotating shaft (201), and the front slip ring (202) is axially movably matched with the inner ring plate (1013) through the supporting and positioning assembly (300); The compensation component (400) is arranged on at least one of the front sliding ring (202), the rear sliding ring (203) or between the front sliding ring (202) and the rear sliding ring (203); the semi-ring (204) is assembled on the rotating shaft (201) through the first end of the cylinder shell (1011) in a clamping way, is abutted with the rear sliding ring (203) along the axial direction, and limits the rear sliding ring (203).
  5. 5. The automatic compensating rotary seal device of claim 4, wherein the rotating shaft (201) comprises a connecting section (2011), a surface attaching section (2012), a plugging section (2013) and a clamping positioning section (2014) which are sequentially arranged; The connecting section (2011) is arranged by extending outwards along the axial direction from the second end of the cylinder shell (1011), and the connecting section (2011) is used for fixedly connecting with a rotary power source; the surface attaching section (2012) is arranged by extending outwards in the radial direction, and the surface attaching section (2012) is used for being movably matched with the inner ring plate (1013) in the axial direction and the radial direction through the supporting and positioning assembly (300) and ensuring the coaxiality of the rotating shaft (201) when rotating; The inserting section (2013) is arranged in an extending way from the axial direction into the cylinder shell (1011) and is in dynamic sealing fit and/or circumferential limit fit with the front slip ring (202) and/or the rear slip ring (203); the clamping and positioning section (2014) is arranged to extend outwards from the axial direction to the first end of the cylinder shell (1011), and the clamping and positioning section (2014) is used for being matched with the semi-ring (204) in a clamping way so as to axially abut against the rear sliding ring (203) and limit the rear sliding ring (203).
  6. 6. The automatic rotary-compensated sealing device according to claim 4, further comprising an auxiliary sealing assembly comprising a movable seal ring (600), wherein the inner annular wall of the front slip ring (202) is sealingly connected to the rotary shaft (201) by the movable seal ring (600), and/or wherein the outer annular wall of the front slip ring (202) is sealingly connected to the cylinder housing (1011) by the movable seal ring (600), and/or The compensation component (400) is positioned in a containing space (500) formed by enclosing the front slip ring (202), the rear slip ring (203) and the rotating shaft (201).
  7. 7. The self-compensating rotary seal device of any of claims 1 to 6, wherein the support positioning assembly (300) comprises a front slide bearing (301), a planar bearing (302) and a rear slide bearing (303), the front slide bearing (301), the planar bearing (302) and the rear slide bearing (303) being disposed between the moving ring assembly (200) and the stationary ring assembly (100) and being arranged in sequence from front to rear in the axial direction; The front sliding bearing (301) is movably supported between the rotating shaft (201) of the moving ring assembly (200) and the inner ring plate (1013) of the stationary ring assembly (100), and/or the plane bearing (302) is movably supported between the front sliding ring (202) of the moving ring assembly (200) and the inner ring plate (1013) of the stationary ring assembly (100), and/or the rear sliding bearing (303) is movably supported between the rear sliding ring (203) of the moving ring assembly (200) and the cylinder housing (1011) of the stationary ring assembly (100).
  8. 8. The automatic compensating rotary seal device of any of claims 1 to 6, wherein the compensating assembly (400) employs a spring (401) with pre-compression or pre-tension applied thereto; The spring (401) is axially arranged between the front sliding ring (202) of the moving ring assembly (200) and the rear sliding ring (203) of the moving ring assembly (200), or the spring (401) is axially arranged between the front sliding ring (202) of the moving ring assembly (200) and the cylinder shell (1011) of the static ring assembly (100), or the spring (401) is axially arranged between the rear sliding ring (203) of the moving ring assembly (200) and the semi-ring (204) of the moving ring assembly (200), or the spring (401) is axially arranged between the rear sliding ring (203) of the moving ring assembly (200) and the cylinder shell (1011) of the static ring assembly (100).
  9. 9. A method of assembling an automatically compensating rotary seal device, for use in the assembly of an automatically compensating rotary seal device according to any of claims 1 to 8, comprising the steps of: A plane bearing (302), a front sliding ring (202), a spring (401), a rear sliding bearing (303) and a rear sliding ring (203) are sequentially arranged in an inner cavity of the rotating fixed ring (101) from a first end of the rotating fixed ring (101), so that the plane bearing (302) is axially supported between the front sliding ring (202) and the rotating positioning, and the rear sliding bearing (303) is radially supported between the rear sliding ring (203) and the rotating fixed ring (101); Sequentially loading a front sliding bearing (301) and a rotating shaft (201) from a second end of the rotating fixed ring (101), supporting the front sliding bearing (301) between the rotating shaft (201) and the rotating fixed ring (101) along the axial direction and the radial direction, and enabling the rotating shaft (201) to pass through a plane bearing (302), a front sliding ring (202), a spring (401), a rear sliding bearing (303) and a rear sliding ring (203); Mounting a half ring (204) at a first end of the rotating stator ring (101) to lock the rear slip ring (203) and to generate a pre-compression force for the spring (401); a stationary seal ring (102) is respectively mounted on the outer periphery and the bonding surface of the rotary stationary ring (101).
  10. 10. An automatic rotary-compensating sealing method, characterized in that the automatic rotary-compensating sealing device according to any one of claims 1 to 8 is used, comprising the steps of: A first end of a rotary fixed ring (101) of the automatic compensation rotary sealing device is arranged in an inner cavity of an equipment shell, an outer edge plate (1012) of the rotary fixed ring (101) is fixedly connected with the end face of the equipment shell, and a rotary shaft (201) is connected with a transmission part of the equipment shell; The rotary power source is connected to a connecting section (2011) of the rotary shaft (201) and drives the rotary shaft (201) to rotate, so that a transmission part in the equipment shell is driven to rotate, the rotary shaft (201) is supported in the rotary fixed ring (101) in a multi-point and three-dimensional manner through the front sliding bearing (301), the plane bearing (302) and the rear sliding bearing (303) to ensure the rotary stability of the rotary shaft (201) and the coaxiality of the rotary shaft (201), the front sliding ring (202) and the rear sliding ring (203); In the process of automatically compensating long-time rotation or frequent start-stop of the rotary dynamic sealing device, the sealing pair formed by the front sliding ring (202) and the rear sliding ring (203) only generates axial abrasion through the synergistic action of the front sliding bearing (301), the plane bearing (302) and the rear sliding bearing (303); When the sealing pair formed by the front sliding ring (202) and the rear sliding ring (203) is worn axially, the axial automatic compensation is carried out through the spring (401) with pre-pressure applied to ensure that the sealing effect of the sealing pair is effective.

Description

Automatic compensation rotary sealing device, method and device assembling method Technical Field The invention relates to the technical field of dynamic sealing, in particular to an automatic compensation rotary sealing device, an automatic compensation rotary sealing method and an automatic compensation rotary sealing device assembling method. Background The rotary dynamic sealing device is a key basic component widely applied to various rotary machines (such as pumps, compressors, reaction kettles, turbo machines and the like), and has the core function of isolating gaps between equipment shells and rotating shafts and preventing internal working media (such as liquid, gas or slurry containing solid particles) from leaking outwards or preventing external impurities from invading. With the increasing requirements of modern industry on equipment efficiency, reliability and environmental protection, the working condition of rotary dynamic sealing is more severe, and long-term stable operation is usually required under extreme working conditions such as high pressure, high speed and complex medium components. Existing conventional dynamic sealing technologies, such as packing seals, lip seals, traditional contact mechanical seals, etc., generally face the following major technical challenges in long-term operation: 1. The sealing reliability under long-term operation is difficult to be continuously ensured. Since dynamic seals rely on a tight bond between the seal faces to block the leakage path, the seal secondary material inevitably wears during long-term high-speed relative friction. With the accumulation of the abrasion loss, the fit clearance between the sealing end faces can be gradually increased, and the sealing effect is directly attenuated or even fails. The process is accelerated under the high-pressure working condition, the leakage is more easily caused by the pressure of the medium, and meanwhile, the medium containing solid particles can cause serious abrasive wear on the sealing end face, so that the expansion of a sealing gap is further aggravated, and the leakage risk is sharply increased. 2. The lack of an effective online wear compensation mechanism is costly to operate and maintain. Most conventional sealing structures have no or only limited automatic compensation capability. When the seal leaks due to wear, equipment is typically shut down, the sealing device is disassembled by a professional, and the gasket is manually adjusted, the seal ring replaced, or the gland is retightened to restore the preload. The maintenance mode not only consumes a great deal of manpower and spare part cost, but also can cause unplanned shutdown of equipment and seriously affect production continuity. Furthermore, the precision of manual adjustment is difficult to ensure, and improper operation may introduce new unbalance or eccentricity, rather accelerating the re-failure of the seal. 3. The structural complexity and the installation accuracy requirements limit the adaptability and the application range. Advanced sealing devices with automatic compensation function (such as multi-spring, bellows, etc.) are partially provided, and their compensation structure is often designed precisely and in complex manner. This results in very stringent requirements on the runout of the rotating shaft, the centring of the device and the operating level of the installer. The minor mounting deviations may cause the compensating mechanism to fail or result in a biased wear of the sealing end surfaces. Therefore, such devices are often difficult to flexibly and reliably adapt to rotating equipment of different specifications and different manufacturing precision, and have obvious short plates in terms of versatility and quick replacement on site. In summary, in the prior art, there is a technical contradiction to be solved in the aspects of reliable sealing, maintenance-free or low-maintenance operation, wide working conditions and equipment adaptability, and there is an urgent need for a rotary dynamic sealing device with a more reasonable structural design, capable of effectively realizing automatic wear compensation, friendly to installation and capable of adapting to complex working conditions, so as to improve the reliability, economy and safety of the overall operation of the equipment. Disclosure of Invention The invention provides an automatic compensation rotary sealing device, a method and a device assembling method, wherein a built-in compensation component is used for continuously applying a pretightening force pointing to a static ring component to a dynamic ring component in an axial direction so as to offset a gap generated by abrasion of a sealing end surface in real time, and a support positioning component is used for maintaining radial stability and coaxiality between the dynamic ring component and the static ring component, so that the tight fitting of a sealing pair is automatically maintained in long-t