Automatic compensation rotary dynamic sealing device and method and device assembling method

Abstract

The invention relates to the technical field of dynamic sealing, and discloses an automatic compensation rotary dynamic sealing device and method and a device assembling method.The automatic compensation rotary dynamic sealing device comprises a static ring assembly, a static ring assembly and a dynamic ring assembly, the movable ring assembly is sleeved with the static ring assembly, and the movable ring assembly and the static ring assembly form axial and radial movable sealing fit so as to form a main sealing face; the supporting and positioning assembly is movably arranged between the static ring assembly and the moving ring assembly in a supporting manner, is linked with the moving ring assembly, and is used for bearing the radial load of the moving ring assembly and ensuring the coaxiality of the moving ring assembly and the static ring assembly during rotation; the compensation assembly is connected with the movable ring assembly and used for applying pretightening force towards the static ring assembly to the movable ring assembly in the axial direction so as to achieve automatic abrasion compensation. A gap generated by abrasion of a sealing end face is counteracted in real time, radial stability and coaxiality are maintained, and therefore tight attachment of a sealing pair is automatically maintained in the long-term operation process, and the problems of sealing gap expansion and the like are solved.

Description

Technical Field

[0001] This invention relates to the field of dynamic sealing technology, and in particular to an automatic compensation rotary dynamic sealing device, method, and device assembly method. Background Technology

[0002] Rotary dynamic seals are key components widely used in various rotating machinery (such as pumps, compressors, reactors, and turbines). Their core function is to isolate the gap between the equipment housing and the rotating shaft, preventing the internal working medium (such as liquid, gas, or slurry containing solid particles) from leaking out, or preventing external impurities from entering.

[0003] With the increasing demands of modern industry for equipment efficiency, reliability, and environmental protection, the operating conditions of rotary dynamic seals are becoming increasingly stringent, typically requiring long-term stable operation under extreme conditions such as high pressure, high speed, and complex media composition. Existing conventional dynamic sealing technologies, such as packing seals, lip seals, and traditional contact mechanical seals, generally face the following major technical challenges during long-term operation:

[0004] 1. Long-term sealing reliability is difficult to guarantee. Since dynamic seals rely on a tight fit between the sealing faces to block leakage paths, wear is inevitable in the sealing materials during long-term high-speed relative friction. As wear accumulates, the gap between the sealing faces gradually increases, directly leading to a decrease in sealing effectiveness or even failure. This process is accelerated under high-pressure conditions, where the medium pressure makes leakage more likely; simultaneously, media containing solid particles cause severe abrasive wear on the sealing faces, further exacerbating the widening of the sealing gap and drastically increasing the risk of leakage.

[0005] 2. Lack of an effective online wear compensation mechanism leads to high maintenance costs. Most traditional sealing structures lack or have only limited automatic compensation capabilities. When a seal leaks due to wear, equipment shutdown is usually required, and professionals must disassemble the sealing device to manually adjust gaskets, replace sealing rings, or retighten the gland to restore preload. This maintenance method not only consumes significant manpower and spare parts costs but also leads to unplanned equipment downtime, severely impacting production continuity. Furthermore, the precision of manual adjustments is difficult to guarantee; improper operation may introduce new imbalances or eccentricities, accelerating seal failure again.

[0006] 3. The complexity of the structure and the precision requirements for installation limit its adaptability and application range. Some advanced sealing devices with automatic compensation functions (such as those using multiple springs or bellows) often have sophisticated and complex compensation structures. This places extremely stringent demands on the runout of the rotating shaft, the alignment of the equipment, and the skill level of the installers. Even minor installation deviations can cause the compensation mechanism to malfunction or lead to uneven wear on the sealing end face. Therefore, these devices often struggle to flexibly and reliably adapt to rotating equipment of different specifications and manufacturing precisions, exhibiting significant shortcomings in versatility and rapid on-site replacement.

[0007] In summary, existing rotary dynamic sealing devices face several technical challenges in terms of long-term reliable sealing, maintenance-free or low-maintenance operation, and broad adaptability to various working conditions and equipment. There is an urgent need for a rotary dynamic sealing device with a more rational structural design, effective automatic wear compensation, ease of installation, and adaptability to complex working conditions, in order to improve the overall reliability, economy, and safety of the equipment. Summary of the Invention

[0008] This invention provides an automatic compensation rotary dynamic seal device, method, and assembly method. By using a built-in compensation component, a preload force is continuously applied axially to the dynamic ring assembly, pointing towards the stationary ring assembly, to offset the gap caused by wear on the sealing end face in real time. The support and positioning component maintains radial stability and coaxiality between the dynamic and stationary ring assemblies, thereby automatically maintaining a tight fit between the sealing pairs during long-term operation. This solves the technical problems of existing rotary dynamic seals, such as widening of sealing gaps due to wear, high risk of leakage, reliance on manual shutdown for maintenance, complex compensation structure, and stringent installation accuracy requirements.

[0009] According to one aspect of the present invention, an automatic compensation rotary dynamic seal device is provided, comprising: a stationary ring assembly for fixing to the end face of a device housing and providing a stationary sealing reference surface; a dynamic ring assembly fitted inside the stationary ring assembly and forming an axial and radial dynamic seal fit with the stationary ring assembly to form a main sealing surface; a support and positioning assembly movably and supportively disposed between the stationary ring assembly and the dynamic ring assembly, and moving in conjunction with the dynamic ring assembly, for bearing the radial load of the dynamic ring assembly and ensuring the coaxiality of the dynamic ring assembly and the stationary ring assembly during rotation; and a compensation assembly connected to the dynamic ring assembly for applying a preload force axially toward the dynamic ring assembly in the direction toward the stationary ring assembly to achieve automatic wear compensation.

[0010] Furthermore, the stationary ring assembly includes a rotating fixed ring; the rotating fixed ring includes a cylindrical shell, an outer edge plate, and an inner ring plate, the first end of the cylindrical shell is used for insertion and assembly into the equipment housing; the outer wall surface of the cylindrical shell extends radially outward to form an outer edge plate, which is used for axially fitting and connecting with the end face of the equipment housing; the inner wall surface of the cylindrical shell extends radially inward to form an inner ring plate, which is used for the rotating ring assembly to be inserted through and to move and cooperate with the rotating ring assembly via a support and positioning assembly.

[0011] Furthermore, the stationary ring assembly also includes a stationary sealing ring, which is disposed on the mating surface of the outer edge plate and / or the outer wall of the cylindrical shell.

[0012] Furthermore, the rotating ring assembly includes a rotating shaft, a front slip ring, a rear slip ring, and a half-ring; the rotating shaft passes through the second end of the cylindrical shell into the inner cavity of the cylindrical shell and is movably engaged with the inner ring plate via a support and positioning assembly; the front slip ring and the rear slip ring are sequentially installed into the inner cavity of the cylindrical shell from the first end of the cylindrical shell and fitted onto the outside of the rotating shaft, and the front slip ring is axially movably engaged with the inner ring plate via the support and positioning assembly; a compensation assembly is arranged on the front slip ring, the rear slip ring, or at least one of the front slip ring and the rear slip ring; the half-ring is snapped onto the rotating shaft from the first end of the cylindrical shell and abuts against the rear slip ring axially and limits the rear slip ring.

[0013] Furthermore, the rotating shaft includes a connecting section, a surface-fitting section, an insertion section, and a snap-fit ​​positioning section arranged sequentially. The connecting section extends axially outward from the second end of the cylindrical shell and is used to fixably connect to the rotating power source. The surface-fitting section extends radially outward and is used to move axially and radially with the inner ring plate via a support positioning component, ensuring the coaxiality of the rotating shaft during rotation. The insertion section extends axially into the cylindrical shell and has a dynamic sealing fit and / or circumferential limiting fit with the front slip ring and / or the rear slip ring. The snap-fit ​​positioning section extends axially outward from the first end of the cylindrical shell and is used to snap-fit ​​with the semi-ring to abut against the rear slip ring axially and limit the rear slip ring.

[0014] Furthermore, it also includes an auxiliary sealing assembly, which includes a dynamic sealing ring. The inner ring wall of the front slip ring is sealed to the rotating shaft through the dynamic sealing ring, and / or the outer ring wall of the front slip ring is sealed to the cylindrical shell through the dynamic sealing ring; and / or the compensation assembly is located within the accommodating space formed by the front slip ring, the rear slip ring, and the rotating shaft.

[0015] Furthermore, the support and positioning assembly includes a front sliding bearing, a flat bearing, and a rear sliding bearing, which are arranged between the dynamic ring assembly and the stationary ring assembly and sequentially from front to back along the axial direction.

[0016] Furthermore, the front sliding bearing is movably supported between the rotating shaft of the rotating ring assembly and the inner ring plate of the stationary ring assembly; and / or the planar bearing is movably supported between the front sliding ring of the rotating ring assembly and the inner ring plate of the stationary ring assembly; and / or the rear sliding bearing is movably supported between the rear sliding ring of the rotating ring assembly and the cylindrical shell of the stationary ring assembly.

[0017] Furthermore, the compensation component employs a spring with preload or pretension applied.

[0018] Furthermore, the spring is axially arranged between the front slip ring and the rear slip ring of the rotating ring assembly, or axially arranged between the front slip ring and the cylindrical shell of the stationary ring assembly, or axially arranged between the rear slip ring and the half ring of the rotating ring assembly, or axially arranged between the rear slip ring and the cylindrical shell of the stationary ring assembly.

[0019] According to another aspect of the present invention, an assembly method for an automatically compensating rotary dynamic seal device is also provided for the conversion of the aforementioned automatically compensating rotary dynamic seal device, comprising the following steps: sequentially inserting a planar bearing, a front slip ring, a spring, a rear sliding bearing, and a rear slip ring into the inner cavity of the rotary fixed ring from a first end of the rotary fixed ring, such that the planar bearing is axially supported between the front slip ring and the rotary positioning, and the rear sliding bearing is radially supported between the rear slip ring and the rotary fixed ring; sequentially inserting a front sliding bearing and a rotary shaft from a second end of the rotary fixed ring, such that the front sliding bearing is axially and radially supported between the rotary shaft and the rotary fixed ring, and the rotary shaft passes through the planar bearing, the front slip ring, the spring, the rear sliding bearing, and the rear slip ring; installing a half-ring at the first end of the rotary fixed ring to lock the rear slip ring, and causing the spring to generate preload; and installing static sealing rings on the outer circumference of the rotary fixed ring and on the mating surface, respectively.

[0020] According to another aspect of the present invention, an automatic compensation rotary dynamic seal method is also provided, employing the aforementioned automatic compensation rotary dynamic seal device, comprising the following steps: inserting the first end of the rotating fixed ring of the automatic compensation rotary dynamic seal device into the inner cavity of the equipment housing, and fixing the outer edge plate of the rotating fixed ring against the end face of the equipment housing, thereby connecting the rotating shaft to the transmission part of the equipment housing; connecting the rotating power source to the connecting section of the rotating shaft and driving the rotating shaft to rotate, thereby driving the transmission part inside the equipment housing to rotate; the rotating shaft is supported in the rotating fixed ring at multiple points and in a three-dimensional manner via a front sliding bearing, a plane bearing, and a rear sliding bearing to ensure the rotational stability of the rotating shaft and the coaxiality of the rotating shaft, the front sliding ring, and the rear sliding ring; during the long-term rotation or frequent start-stop process of the automatic compensation rotary dynamic seal device, the sealing pair formed by the front sliding bearing, the plane bearing, and the rear sliding bearing, through the synergistic action of the front sliding bearing, the plane bearing, and the rear sliding bearing, causes only axial wear to occur in the sealing pair formed by the front sliding ring and the rear sliding ring; when the sealing pair formed by the front sliding ring and the rear sliding ring experiences axial wear, automatic axial compensation is performed by a spring with preload applied to ensure the effective sealing effect of the sealing pair.

[0021] The present invention has the following beneficial effects: 1. The compensation component can continuously apply a preload force to the rotating ring assembly along the axial direction, pointing towards the stationary ring assembly, to adaptively compensate for the wear that inevitably occurs on the sealing end face due to friction during long-term operation. When wear causes the contact gap between the sealing end faces to increase, the preload force applied by the compensation component will drive the rotating ring assembly to make a slight compensatory displacement along the axial direction, thereby automatically and in real time offsetting the gap increase caused by material wear. This ensures that the main sealing surface can always maintain a tight contact state throughout the entire life cycle of the equipment, significantly improving the long-term reliability and stability of the seal and solving the technical problem of increased leakage risk caused by the expansion of wear gaps. At the same time, this automatic compensation mechanism realizes online compensation for wear without manual intervention, thereby avoiding the loss of production efficiency and increased operation and maintenance costs caused by periodic shutdown for disassembly and maintenance.

[0022] 2. The support and positioning component is movably positioned between the stationary ring assembly and the rotating ring assembly, and is linked with the rotating ring assembly. The support and positioning component bears the radial load transmitted by the rotating ring assembly, ensuring the dynamic coaxiality of the rotating ring assembly and the stationary ring assembly during high-speed relative rotation. By effectively managing the radial load and rotational concentricity, the support and positioning component provides a stable operating foundation for the axial compensation mechanism, preventing problems such as uneven wear of the sealing end face, uneven compensation force, or even jamming caused by radial runout or off-center loading. This allows the axial preload applied by the compensation component to act evenly and effectively on the entire sealing ring surface. The compensation component solves the problem of axial wear compensation, while the support and positioning component provides the necessary radial and rotational accuracy guarantee for the smooth and accurate execution of this compensation process. The two work together to ensure the effectiveness and durability of the automatic compensation function under complex working conditions.

[0023] 3. The layout of fitting the rotating ring assembly within the stationary ring assembly, combined with compensation and support positioning mechanisms, makes the entire device more compact and integrated. This reduces the reliance on the precision of the equipment housing and related assembly structures of the rotating shaft, simplifying the on-site installation and alignment procedures. As a pre-calibrated integrated module, the device's adaptability is enhanced, enabling it to be more flexibly applied to rotating equipment of different specifications. This solves the technical problems of traditional complex compensation sealing devices, which have stringent installation precision requirements and limited application scenarios.

[0024] In addition to the objectives, features, and advantages described above, the present invention has other objectives, features, and advantages. The invention will now be described in further detail with reference to the figures. Attached Figure Description

[0025] The accompanying drawings, which form part of this invention, are used to provide a further understanding of the invention. The illustrative embodiments of the invention and their descriptions are used to explain the invention and do not constitute an undue limitation of the invention. In the drawings: Figure 1 This is a schematic diagram of the structure of the automatic compensation rotary sealing device according to a preferred embodiment of the present invention.

[0026] Legend: 100. Stationary ring assembly; 101. Rotary fixed ring; 1011. Cylindrical shell; 1012. Outer edge plate; 1013. Inner ring plate; 102. Stationary sealing ring; 200. Rotary ring assembly; 201. Rotating shaft; 2011. Connecting section; 2012. Surface contact section; 2013. Insertion section; 2014. Snap-fit ​​positioning section; 202. Front slip ring; 203. Rear slip ring; 204. Half ring; 300. Support positioning assembly; 301. Front sliding bearing; 302. Plane bearing; 303. Rear sliding bearing; 400. Compensation assembly; 401. Spring; 500. Accommodation space; 600. Rotary sealing ring. Detailed Implementation

[0027] The embodiments of the present invention will be described in detail below with reference to the accompanying drawings. However, the present invention can be implemented in many different ways as defined and covered below.

[0028] like Figure 1As shown, the automatic compensation rotary dynamic seal device of this embodiment includes: a stationary ring assembly 100, which is fixed to the end face of the equipment housing and provides a stationary sealing reference surface; a dynamic ring assembly 200, which is fitted inside the stationary ring assembly 100 and forms an axial and radial dynamic seal with the stationary ring assembly 100 to form a main sealing surface; a support and positioning assembly 300, which is movably supported between the stationary ring assembly 100 and the dynamic ring assembly 200 and moves in conjunction with the dynamic ring assembly 200 to bear the radial load of the dynamic ring assembly 200 and ensure the coaxiality of the dynamic ring assembly 200 and the stationary ring assembly 100 when rotating; and a compensation assembly 400, which is connected to the dynamic ring assembly 200 and applies a preload force axially toward the dynamic ring assembly 200 toward the stationary ring assembly 100 to achieve automatic wear compensation. This invention relates to an automatic compensation rotary dynamic seal device. The compensation component 400 continuously applies a preload force axially to the dynamic ring component 200, pointing towards the stationary ring component 100, adaptively compensating for the wear that inevitably occurs on the sealing end faces due to friction during long-term operation. When wear causes the contact gap between the sealing end faces to increase, the preload force applied by the compensation component 400 drives the dynamic ring component 200 to make a slight compensatory displacement axially, thereby automatically and in real time offsetting the gap increase caused by material wear. This ensures that the main sealing surface maintains a tight fit throughout the entire lifespan of the equipment, significantly improving the long-term reliability and stability of the seal and solving the technical problem of increased leakage risk due to widened wear gaps. Simultaneously, this automatic compensation mechanism achieves online wear compensation without manual intervention, thus avoiding production efficiency losses and increased maintenance costs caused by periodic downtime for disassembly and maintenance. The support and positioning component 300 is movably positioned between the stationary ring component 100 and the rotating ring component 200, and is linked with the rotating ring component 200. The support and positioning component 300 bears the radial load transmitted by the rotating ring component 200, ensuring the dynamic coaxiality of the rotating ring component 200 and the stationary ring component 100 during high-speed relative rotation. By effectively managing the radial load and rotational concentricity, the support and positioning component 300 provides a stable operating foundation for the axial compensation mechanism, preventing problems such as uneven wear of the sealing end face, uneven compensation force, or even jamming caused by radial runout or off-center load. This allows the axial preload applied by the compensation component 400 to act evenly and effectively on the entire sealing ring surface. The compensation component 400 solves the problem of axial wear compensation, while the support and positioning component 300 provides the necessary radial and rotational accuracy guarantee for the smooth and accurate execution of this compensation process. The two work together to ensure the effectiveness and durability of the automatic compensation function under complex working conditions.The layout of the dynamic ring assembly 200 within the stationary ring assembly 100, combined with compensation and support positioning mechanisms, makes the entire device more compact and integrated. This reduces the reliance on the precision of the equipment housing and rotating shaft 201, simplifying on-site installation and alignment procedures. As a pre-calibrated modular unit, the device's adaptability is enhanced, allowing for more flexible application to rotating equipment of different specifications. This solves the technical problems of traditional complex compensation sealing devices, which have stringent installation precision requirements and limited application scenarios. This invention's automatic compensation rotary dynamic sealing device, through the specific structure and coordinated operation of the compensation assembly 400, support positioning assembly 300, dynamic ring assembly 200, and stationary ring assembly 100, constructs a sealing system capable of automatically and accurately compensating for wear gaps and maintaining a stable operating posture. Without external intervention, it achieves long-term self-maintenance of sealing performance, effectively overcoming the problems of frequent maintenance due to wear leakage and the high installation and application requirements of complex sealing structures in existing technologies. This results in comprehensive positive effects in improving sealing reliability, reducing life-cycle maintenance costs, and enhancing operational adaptability. Optionally, the base structure of the stationary ring assembly 100 and / or the dynamic ring assembly 200 is made of high-strength aluminum alloy material, which can achieve lightweighting of the overall structure, facilitate on-site disassembly and maintenance, and effectively improve the practicality and adaptability of the device.

[0029] like Figure 1As shown, in this embodiment, the stationary ring assembly 100 includes a rotating fixed ring 101; the rotating fixed ring 101 includes a cylindrical shell 1011, an outer edge plate 1012, and an inner ring plate 1013. The first end of the cylindrical shell 1011 is used for insertion and assembly into the equipment housing; the outer wall surface of the cylindrical shell 1011 extends radially outward to form the outer edge plate 1012, which is used for axially fitting and connecting with the end face of the equipment housing; the inner wall surface of the cylindrical shell 1011 extends radially inward to form the inner ring plate 1013, which is used for the rotating ring assembly 200 to be inserted through and to be movably engaged with the rotating ring assembly 200 via the support and positioning assembly 300. Designing the first end of the cylindrical shell 1011 as an insertion and assembly structure for insertion and assembly into the equipment housing provides effective axial positioning and initial support for the stationary ring assembly 100, enhancing the stability of its connection with the equipment housing and providing a reliable and well-aligned static installation reference for the entire sealing device. The outer edge plate 1012, formed by the radial outward extension of the outer wall of the cylindrical shell 1011, is used for axial contact and fixed connection with the end face of the equipment shell. The outer edge plate 1012 constitutes a flange-type connection surface. The stationary ring assembly 100 can be firmly fixed on the end face of the equipment by fasteners such as bolts. This end face contact fixing method is not only convenient to install and disassemble, but also ensures that the sealing end face of the stationary ring assembly 100 (such as on the inner ring plate 1013 or related components) can maintain a strict perpendicular relationship with the end face of the equipment, laying a precise spatial reference for the formation of the dynamic sealing interface. The inner ring plate 1013, formed by the radially inward extension of the inner wall of the cylindrical shell 1011, provides a structural carrier for the insertion of the rotating ring assembly 200 and the arrangement of the support positioning assembly 300. The central through hole enclosed by the inner ring plate 1013 allows the rotating ring assembly 200 (such as the rotating shaft 201 and related rotating rings) to pass through it, realizing the transmission of rotational function. On the other hand, the surface or end face of its central through hole provides a precise installation and mating surface for the support positioning assembly 300 (such as a bearing). Through the active mating between the support positioning assembly 300 and the rotating ring assembly 200, the structure of the inner ring plate 1013 achieves the constraint and guidance of the radial movement of the rotating ring assembly 200, ensuring that the rotating ring assembly 200 and the stationary ring assembly 100 maintain stable coaxiality. The inserted cylindrical shell 1011, the axially fitted outer edge plate 1012, and the radially extending inner ring plate 1013 together constitute a functionally integrated static ring support frame. From the three dimensions of axial insertion positioning, end face fastening and sealing, and radial support and centering guidance, it constructs a static foundation platform with good rigidity, accurate positioning, and easy installation for the entire automatic compensation rotary dynamic sealing device. The effectiveness of this platform directly ensures that the subsequent dynamic ring assembly 200, compensation assembly 400, and support positioning assembly 300 can work accurately and reliably within their preset spatial relationships.The specific structural design of the stationary ring assembly 100 achieves multi-functional integration and optimization through its integrated construction. While ensuring a firm and precise installation between itself and the equipment housing, it provides the necessary and stable guiding and mating interface for the movement and support of the dynamic ring assembly 200. This improves the static foundation accuracy and overall structural rigidity of the sealing device, providing an indispensable structural guarantee for subsequent effective dynamic sealing, automatic compensation, and stable operation. It solves the problem of early failure or compensation function failure caused by inaccurate installation benchmarks and insufficient rigidity in traditional sealing devices.

[0030] like Figure 1 As shown, in this embodiment, the stationary ring assembly 100 further includes a stationary sealing ring 102, which is disposed on the mating surface of the outer edge plate 1012 and / or the outer wall of the cylindrical shell 1011. When the stationary sealing ring 102 is disposed on the mating surface of the outer edge plate 1012, the stationary sealing ring 102 fills the assembly gap between the outer edge plate 1012 and the end face of the equipment shell. Under the action of bolt tightening force, the stationary sealing ring 102 undergoes elastic deformation, thereby forming a continuous, leak-free sealing barrier between the two rigid contact surfaces. This effectively prevents the medium inside the equipment (such as lubricating oil, process fluid, or gas) from leaking out from the installation joint surface between the stationary ring assembly 100 and the equipment shell. This ensures that the medium to be sealed by the main sealing system (i.e., the sealing end face of the dynamic ring assembly 200 and the stationary ring assembly 100) is reliably confined within the preset sealing cavity. This is the prerequisite for ensuring that the entire dynamic sealing device achieves its sealing function and the basis for static sealing. When the static sealing ring 102 is arranged on the outer wall of the cylindrical shell 1011, the static sealing ring 102 fills the radial assembly gap between the cylindrical shell 1011 and the inner hole of the equipment housing to solve potential radial leakage path problems. During equipment operation, due to pressure pulsation, vibration or thermal deformation, the static ring assembly 100 may have a small radial relative displacement or gap change with the equipment housing. The static sealing ring 102 arranged here can adaptively compensate for this gap change through its radial elastic contact pressure, continuously block possible radial leakage channels, and further enhance the sealing reliability of the connection interface between the static ring assembly 100 and the equipment housing, especially under the condition of radial pressure difference. The two placement positions of the static sealing ring 102 can be implemented individually or in combination. When implemented in combination, the static sealing ring 102 provides sealing on both the axial mating surface and the radial mating surface. Their functions are complementary, forming a multi-directional, redundant static sealing system. This system can more effectively resist medium pressure from different directions and potential leakage tendencies, significantly improving the overall sealing robustness of the static ring assembly 100 mounting interface and reducing the risk of leakage of the entire device due to the failure of a single static sealing point. Optionally, multiple sealing grooves can be arranged radially on a surface such as the outer edge plate, and multiple static sealing rings can be arranged there. Optionally, multiple static sealing rings can be arranged axially on the outer side wall of the cylindrical shell 1011.

[0031] like Figure 1As shown, in this embodiment, the rotating ring assembly 200 includes a rotating shaft 201, a front slip ring 202, a rear slip ring 203, and a half-ring 204. The rotating shaft 201 passes through the second end of the cylindrical shell 1011 into the inner cavity of the cylindrical shell 1011 and is movably engaged with the inner ring plate 1013 via the support and positioning assembly 300. The front slip ring 202 and the rear slip ring 203 are sequentially inserted into the inner cavity of the cylindrical shell 1011 from the first end and fitted onto the rotating shaft 201. The front slip ring 202 is axially movable with the inner ring plate 1013 via the support and positioning assembly 300. The compensation assembly 400 is arranged on at least one of the front slip ring 202, the rear slip ring 203, or between the front slip ring 202 and the rear slip ring 203. The half-ring 204 is snapped onto the rotating shaft 201 from the first end of the cylindrical shell 1011 and abuts against the rear slip ring 203 axially, limiting the rear slip ring 203. The design of the rotating shaft 201, which passes through the second end of the cylindrical shell 1011 and is movablely engaged with the support and positioning assembly 300, allows the power transmission and main sealing functions to be spatially separated. The rotating shaft 201 obtains radial and axial constraints from the inner ring plate 1013 of the stationary ring assembly 100 through the support and positioning assembly 300, ensuring the stability of its rotation centerline and providing a precise rotation reference for the entire rotating ring assembly 200. The front slip ring 202 and the rear slip ring 203 are sequentially installed from the first end of the cylindrical housing 1011 and fitted onto the outside of the rotating shaft 201. The layout of the front slip ring 202 and the inner ring plate 1013 in an axially movable fit constitutes a sealing actuator unit that can move axially. The front slip ring 202 directly undertakes the function of forming the main sealing surface with the stationary ring assembly 100. Its axial movable fit with the inner ring plate 1013 means that it can freely approach or move away from the sealing reference surface of the stationary ring in the axial direction under the drive of the compensation assembly 400. This axial freedom provides a structural basis for realizing the automatic compensation function. The rear slip ring 203, as a follower, mainly plays the role of transmitting force and assisting in positioning. The compensation component 400 is disposed at least at one of the front slip ring 202, the rear slip ring 203, or both. This design provides flexibility in the path of the compensation force application. Directly placing the compensation component 400 (such as a spring assembly) on the front slip ring 202 allows the compensation force to act directly and efficiently on the sealing end face with a rapid response. Placing it on the rear slip ring 203 allows the rear slip ring 203 to serve as a force transmission medium, potentially making the structure easier to assemble and maintain. Placing it between the front slip ring 202 and the rear slip ring 203 allows for a more even distribution of the load. Regardless of the arrangement, the goal is to provide the front slip ring 202 with a continuous axial thrust directed towards the stationary ring assembly 100 to counteract wear on the sealing end face in real time.The semi-ring 204 is designed to be snapped onto the rotating shaft 201 at its first end and axially abut against the rear slip ring 203. As a simple mechanical stop, the semi-ring 204 reliably transmits the power of the rotating shaft 201 to the rear slip ring 203 and the front slip ring 202 through axial abutment, driving the entire moving ring assembly 200 to rotate synchronously. The semi-ring 204 forms a reliable hard limit on the rear slip ring 203 (and thus the entire moving ring assembly 200) in the axial direction, preventing it from coming off under the action of reverse axial force. The snap-fit ​​assembly method of the semi-ring 204 facilitates the overall assembly and disassembly from the first end of the cylindrical shell 1011, which significantly improves the assembly and maintenance convenience of the device. The aforementioned components work together to form a complete motion and force transmission chain. The rotating shaft 201 transmits torque to the rear slip ring 203 and the front slip ring 202 through the half-ring 204, driving them to rotate together to form a dynamic sealing surface. At the same time, the axial compensation force generated by the compensation component 400 acts on the front slip ring 202 (and / or the rear slip ring 203), pushing the front slip ring 202 to always press against the inner ring plate 1013 of the stationary ring assembly 100. The support and positioning component 300 ensures that the rotating ring assembly 200 and the stationary ring assembly 100 maintain good coaxiality during this process. The limiting function of the half-ring 204 and the movable cooperation of the support and positioning component 300 together ensure the integrity and stability of the rotating ring assembly 200 in rotation and axial compensation motion. The dynamic ring assembly 200, through a clearly defined assembly sequence and spatial relationship, clearly separates yet organically combines the rotary drive, axial compensation motion, and rotary-stationary interface sealing modules. This achieves structural decoupling and integration of the dynamic sealing function and the automatic compensation function, ensuring that the compensation action does not interfere with the rotary drive and that the rotary motion does not affect the compensation accuracy. It provides a configuration for the dynamic ring assembly 200 that is easy to assemble, maintain, and operate reliably. In particular, the use of the half-ring 204 solves the dual requirements of rotary transmission and axial limiting with a simple mechanical structure, ensuring that the automatic compensation function can operate stably and reliably under rotating conditions. Optionally, the front slip ring 202 and the rear slip ring 203 form a sealing pair. The friction surfaces of the front slip ring 202 and / or the rear slip ring 203 are made of silicon carbide hard alloy material, which has excellent wear resistance and anti-particle erosion performance, and can adapt to harsh working conditions such as high pressure, high speed, and particulate media. Optionally, the friction surfaces of the front slip ring 202 and / or the rear slip ring 203 are provided with hydrodynamic grooves (such as spiral grooves, T-grooves, or multi-point pit arrays processed by laser). When the rotating ring assembly 200 rotates, the sealing pair formed by the front slip ring 202 and the rear slip ring 203 generates a hydrodynamic effect during rotation through the hydrodynamic grooves. This technology forms an extremely thin lubricating air mold between the friction surfaces to reduce friction and wear, and can also effectively prevent solid particles from entering the sealing surface by means of centrifugal force.

[0032] like Figure 1As shown, in this embodiment, the rotating shaft 201 includes a connecting section 2011, a surface-fitting section 2012, an insertion section 2013, and a snap-fit ​​positioning section 2014 arranged sequentially. The connecting section 2011 extends axially outward from the second end of the cylindrical shell 1011 and is used for fixed connection with the rotating power source. The surface-fitting section 2012 extends radially outward and is used for axial connection with the inner ring plate 1013 via the support positioning assembly 300. The radially movable fit ensures the coaxiality of the rotating shaft 201 during rotation; the insertion section 2013 extends axially into the cylindrical shell 1011 and has a dynamic sealing fit and / or circumferential limiting fit with the front slip ring 202 and / or the rear slip ring 203; the snap-fit ​​positioning section 2014 extends axially outward from the first end of the cylindrical shell 1011 and is used to snap-fit ​​with the half ring 204 to abut against the rear slip ring 203 axially and limit the rear slip ring 203. The rotating shaft 201 is divided into a multi-functional segmented design along the axial direction into a connecting section 2011, a surface-fitting section 2012, an insertion section 2013, and a snap-fit ​​positioning section 2014. The connecting section 2011 extends outward from the second end of the cylindrical shell 1011 and is used to fix it to the rotating power source. The power input end of the rotating shaft 201 is set outside the sealed cavity, so that the power connection operation (such as keyway connection, flange bolt connection, etc.) is completely independent of the internal complex sealing and compensation components 400. This avoids interference or contamination of the internal cavity structure when assembling or maintaining the power source, and significantly improves the overall modularity of the device and the convenience of assembly and maintenance. The surface-fitting section 2012, through the support and positioning component 300, moves axially and radially with the inner ring plate 1013. It is one of the core areas where the rotating shaft 201 obtains precise motion constraints. Through the support and positioning component 300 (such as a sliding bearing or a combined bearing), it achieves a relative rotational fit with the inner ring plate 1013 of the stationary stationary ring component 100, which has a certain degree of axial freedom. This allows the rotating shaft 201 to effectively suppress radial runout while transmitting torque, ensuring coaxiality. However, its axial position is not completely fixed, thus providing the necessary degree of freedom for the axial compensation displacement that may occur in the rotating ring component 200 (front slip ring 202, rear slip ring 203) and be driven by the compensation component 400. This avoids the compensation mechanism from getting stuck due to the rigid fixation of the rotating shaft 201.The insertion section 2013 extends into the housing and engages with the front slip ring 202 and / or the rear slip ring 203 in a dynamic sealing and / or circumferential limiting fit. It serves as a transition area where the rotating shaft 201 drives the rotating ring assembly 200 and forms an internal seal with it. If a dynamic sealing fit is performed (e.g., by setting a sealing groove to install a shaft seal), it can prevent the medium from further penetrating inward along the surface of the rotating shaft 201, forming an auxiliary sealing line. If a circumferential limiting fit is performed (e.g., by spline, flat key, or interference fit), the torque of the rotating shaft 201 is directly and reliably transmitted to the front slip ring 202 and / or the rear slip ring 203, driving them to rotate synchronously to form the main sealing interface, thus achieving the unification of power transmission and internal medium path management. The snap-fit ​​positioning section 2014 extends outward and engages with the half-ring 204 to axially abut against the rear slip ring 203, completing the final axial connection and limiting between the rotating shaft 201 and the rotating ring assembly 200. The combination of the snap-fit ​​positioning section 2014 (such as a shaft shoulder or snap ring groove) and the half-ring 204 constitutes a reliable axial limiting structure assembled from outside the shaft, ensuring that the rear slip ring 203 (and thus the entire rotating ring assembly 200) maintains a fixed relative position with the rotating shaft 201 in the axial direction, preventing it from axially shifting or coming off under rotational inertia or reverse pressure, thereby ensuring the structural integrity of the rotating ring assembly 200 as an integrated rotary sealing unit. The above four shaft segments constitute a continuous and logically rigorous functional chain of shaft systems; the connecting segment 2011 introduces power, the surface-fitting segment 2012 provides rotational support and axial freedom, the insertion segment 2013 transmits torque and may manage internal sealing, and the snap-fit ​​positioning segment 2014 completes the final axial constraint; they work together to make the rotating shaft 201 not only a component for transmitting power, but also a key component integrating multiple functions such as rotational support, dynamic sealing fit, axial compensation degree of freedom provision, and component limiting. The segmented structural design of the rotating shaft 201 clearly divides and integrates different functional requirements (power connection, support and alignment, torque transmission and sealing, axial limiting) in space, achieving functional decoupling and structural simplification. This makes the force and motion states of each part of the shaft system more clear and controllable. It provides the necessary axial motion freedom for the automatic compensation function, while ensuring the stability and coaxial accuracy of the rotary transmission. The assembly process is optimized, allowing the power connection, internal component assembly, and final axial locking operation to be carried out step by step and independently. This ensures that the entire automatic compensation rotary dynamic seal device can efficiently and reliably integrate rotary motion and axial compensation motion.

[0033] like Figure 1As shown, in this embodiment, an auxiliary sealing assembly is also included. The auxiliary sealing assembly includes a dynamic sealing ring 600. The inner ring wall of the front slip ring 202 is sealed to the rotating shaft 201 through the dynamic sealing ring 600, and / or the outer ring wall of the front slip ring 202 is sealed to the cylindrical housing 1011 through the dynamic sealing ring 600; and / or the compensation assembly 400 is located within the accommodating space 500 formed by the front slip ring 202, the rear slip ring 203 and the rotating shaft 201. When the dynamic seal ring 600 is arranged between the inner ring wall of the front slip ring 202 and the rotating shaft 201, a rotational dynamic seal is achieved between the rotating shaft 201 and the front slip ring 202. The dynamic seal ring 600 fills the annular gap between the front slip ring 202 and the rotating shaft 201, effectively blocking the main axial channel through which the sealed medium may leak outward along the surface of the rotating shaft 201. This seal is a secondary seal located inside the main sealing surface (the end face of the front slip ring 202 and the end face of the inner ring plate 1013), and together with the main sealing surface, it forms a series sealing defense line. Even if the main sealing surface temporarily leaks due to extreme wear or sudden damage, the dynamic seal ring 600 can still provide an effective sealing barrier to prevent the medium from leaking directly to the outside of the equipment, thereby greatly improving the overall sealing reliability, safety and fault tolerance of the device. When the dynamic seal ring 600 is arranged between the outer ring wall of the front slip ring 202 and the cylindrical shell 1011 of the stationary ring assembly 100, a rotational dynamic seal is achieved between the front slip ring 202 and the stationary cylindrical shell 1011. The dynamic seal ring 600 blocks the radial channel through which the medium may leak outward along the annular gap between the outer surface of the front slip ring 202 and the shell. This arrangement complements the inner ring wall seal described above in both radial and axial directions. When the internal pressure of the device is high, the medium may attempt to leak from multiple directions (axial along the axis and radial along the annular gap). By simultaneously setting the dynamic seal ring 600 on the inner and outer ring walls of the front slip ring 202, a more closed sealing chamber can be constructed, blocking leakage paths from multiple dimensions, so that the sealing system can better adapt to different pressure directions and operating conditions.When the compensation component 400 is housed within the accommodating space 500 formed by the front slip ring 202, the rear slip ring 203, and the rotating shaft 201, it offers advantages in integration and protection. From a space utilization perspective, it fully utilizes the internal cavity space naturally formed by the moving ring component 200 and the rotating shaft 201 to accommodate the compensation element (such as a spring assembly), resulting in an extremely compact device structure and optimized axial dimensions, which is beneficial for miniaturization and weight reduction of the sealing device. From a functional and environmental perspective, this accommodating space 500 is a relatively enclosed area. Placing the compensation component 400 within it isolates it from the sealed medium (such as lubricating oil or process fluid) circulating inside the device, preventing particulate matter, corrosive components, or high temperatures in the medium from directly affecting the compensation component 400 (such as the spring). This effectively prevents premature failure of the compensation component 400 due to corrosion, blockage, or thermal stress relaxation, significantly improving the long-term reliability and durability of the compensation function. Furthermore, the enclosed environment also helps maintain the stability of the compensation component 400's operating state and reduces external disturbances. The dynamic seal ring 600 ensures that the pressure medium isolated by the main sealing surface is effectively confined within the preset sealing area by blocking possible leakage bypasses, creating a favorable internal environment for the compensation component 400 to work stably within the accommodating space 500. Conversely, the well-protected compensation component 400 can continuously and reliably provide compensation force to the front slip ring 202, maintain the tight fit of the main sealing surface, reduce the possibility of the medium breaking through the main sealing surface, and thus reduce the pressure difference that the dynamic seal ring 600 needs to withstand. Together, they constitute a sealing system with clear primary and secondary components, internal and external coordination, and a controllable environment.

[0034] like Figure 1As shown, in this embodiment, the support and positioning assembly 300 includes a front sliding bearing 301, a plane bearing 302, and a rear sliding bearing 303. The front sliding bearing 301, plane bearing 302, and rear sliding bearing 303 are arranged between the rotating ring assembly 200 and the stationary ring assembly 100, and are sequentially arranged from front to back along the axial direction. This sequential arrangement of the front sliding bearing 301, plane bearing 302, and rear sliding bearing 303 along the axial direction constructs a multi-point support system distributed along the axial direction. This multi-point support structure divides the axial span of the rotating ring assembly 200 into several shorter support intervals, thereby more effectively constraining the deflection deformation that may occur during the rotation of the rotating shaft 201 and the rotating ring assembly 200, and suppressing vibrations caused by unbalanced mass or external force disturbances, providing higher static stability and dynamic rotational accuracy for the entire rotary sealing system. A planar bearing 302 (such as a thrust ball bearing or a thrust roller bearing) is specifically positioned between the front sliding bearing 301 and the rear sliding bearing 303 to bear and manage the main axial load acting on the dynamic ring assembly 200. This axial load mainly originates from the preload applied by the compensation assembly 400, which presses the front sliding ring 202 against the inner ring plate 1013 (stationary ring). The planar bearing 302, through its high-load-bearing raceway structure, transmits this axial force to the stationary ring assembly 100 (such as the inner ring plate 1013 or a similar structure) in a low-frictional-resistance manner, ensuring that the axial compensation force can be stably and reliably supported. At the same time, it concentrates the frictional resistance and wear caused by the axial force on the planar bearing 302, which is specifically designed for this purpose, thereby protecting the front sliding bearing 301 and the rear sliding bearing 303, allowing them to focus more on their radial support function. The front sliding bearing 301 and the rear sliding bearing 303 (such as radial sliding bearing, axial thrust sliding bearing, T-type sliding bearing, and flanged sliding bearing) constitute a two-point radial support for the rotating shaft 201 and the rotating ring assembly 200. They are located at the front and rear key positions of the rotating ring assembly 200, respectively, and work together to precisely constrain the radial position of the rotating shaft 201. This "two points determine a straight line" support method is one of the most effective means to ensure that the rotation center line of the rotating ring assembly 200 (especially the sealing end face of its front sliding ring 202) can maintain a high degree of coaxiality with the sealing reference surface (inner ring plate 1013 plane) of the stationary ring assembly 100. Excellent coaxiality is a prerequisite for avoiding uneven wear of the sealing end face and achieving uniform wear and effective sealing.These three bearings work closely together to form a composite support system with a clear division of labor and synergistic effect. The planar bearing 302, as a dedicated axial load bearing, ensures the stable realization of the axial compensation function. The front sliding bearing 301 and the rear sliding bearing 303, as the core of radial positioning, jointly ensure the concentricity accuracy of rotation. The sequential arrangement of the three along the axial direction realizes the separation and optimization of the axial force and radial force transmission path in the structure, enabling each bearing to work under its optimal design conditions. Together, this system provides a high-rigidity, low-friction, and high-precision motion guidance and support platform for the dynamic ring assembly 200 under the complex motion of axial compensation force and rotational torque.

[0035] like Figure 1As shown, in this embodiment, 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 planar 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 cylindrical shell 1011 of the stationary ring assembly 100. The front sliding bearing 301 is movably supported between the rotating shaft 201 and the inner ring plate 1013, directly connecting the rotating shaft 201 (power input and core rotating component) to the stationary inner ring plate 1013 through a bearing. This support point constitutes a key radial positioning point of the rotating shaft 201, bearing the radial load transmitted from the rotating shaft 201 (such as belt tension, gear meshing force and other external loads), and effectively suppressing the radial runout of the rotating shaft 201. It provides a stable rotation reference close to the power input end for the entire rotating system, ensuring the smoothness of power transmission and reducing the possible impact of shaft end shaking on the internal sealing components. The planar bearing 302 is movably supported between the front slip ring 202 and the inner ring plate 1013, and is the core axial force bearing and compensation function guarantee point. The planar bearing 302 is directly located between the front slip ring 202, which undertakes the main sealing function, and the stationary inner ring plate 1013. The axial preload from the compensation component 400, the axial preload used to press the sealing end face, and the axial force generated by the possible medium pressure are directly transmitted to the planar bearing 302 through the front slip ring 202. With its low friction and high load-bearing characteristics, the planar bearing 302 smoothly transmits the axial force to the stationary ring component 100 (inner ring plate 1013), thereby ensuring that the front slip ring 202 can continuously and stably apply the compensation force to the sealing end face without bearing excessive frictional resistance, and realize effective and low power consumption automatic compensation. The rear sliding bearing 303 is movably supported between the rear slip ring 203 and the cylindrical housing 1011. At the other end, away from the sealing end face of the front slip ring 202, it provides a second radial support and guide point for the entire dynamic ring assembly 200 (especially the rear slip ring 203). The rear sliding bearing 303 cooperates with the front sliding bearing 301 to form a "two-point support", which together determines the center line of rotation of the dynamic ring assembly 200. The rear slip ring 203 cooperates with the cylindrical housing 1011 through the rear sliding bearing 303, which allows the dynamic ring assembly 200 to have a certain degree of freedom of movement in the axial direction while rotating (because sliding bearings usually allow a small amount of axial movement). This provides the necessary structural space for the compensation component 400 to drive the front slip ring 202 to perform axial compensation displacement, and avoids jamming caused by both points being axially fixed supports. Preferably, the front sliding bearing 301 is supported axially and radially between the rotating shaft 201 and the rotating fixed ring 101, the planar bearing 302 is supported axially between the front sliding ring 202 and the rotating positioning, and the rear sliding bearing 303 is supported radially between the rear sliding ring 203 and the rotating fixed ring 101.In the preferred design, the functions of each bearing are more precisely defined. The front sliding bearing 301 provides axial and radial support (using bearings such as angular contact bearings or bearings with composite load-bearing capacity), assisting in bearing part of the axial force and providing radial positioning. The planar bearing 302 provides axial support, clearly defining its dedicated role in bearing axial loads. The rear sliding bearing 303 provides radial support, emphasizing its primary role in radial positioning and implying that it allows axial floating. The arrangement of these three bearings constitutes a three-dimensional spatial constraint system with complementary functions and collaborative operation. The planar bearing 302 specifically manages axial movement and force, ensuring the establishment and compensation of sealing pressure. The front sliding bearing 301 and the rear sliding bearing 303 mainly manage radial movement accuracy, ensuring rotational concentricity. At the same time, the spatial distribution of each bearing (two radial supports clamping the axial support point) provides the system with good static determinacy and stability. This design, which decouples axial and radial load-bearing functions and assigns them to dedicated bearings, optimizes the stress state of each bearing, reduces frictional losses, and thus improves the overall efficiency, accuracy, and lifespan of the support system.

[0036] like Figure 1As shown, in this embodiment, the compensation component 400 employs a spring 401 with preload or pretension applied. Using the spring 401 as the compensation element utilizes the linear or nonlinear force-displacement relationship inherent in the spring 401 material within its elastic deformation range. When the sealing end face experiences material wear due to friction, causing the moving ring assembly 200 (such as the front slip ring 202) to exhibit a slight axial displacement tendency to move away from the stationary ring assembly 100, the compressed or stretched spring 401 generates a restoring force aimed at restoring its initial length. This restoring force acts directly or indirectly on the moving ring assembly 200 through the end of the spring 401, transforming into an axial compensation force that continuously pushes the moving ring assembly 200 toward the stationary ring assembly 100. This automatically and in real-time offsets the gap increment caused by wear, thereby maintaining the necessary contact pressure (sealing pressure) between the sealing end faces. Applying preload or pretension to spring 401 is the initial condition for achieving effective compensation. In the initial state after the device is assembled (i.e., before the sealing end face has worn), spring 401 is pre-compressed or stretched to a certain state, thereby storing initial elastic potential energy and generating an initial axial preload. This initial preload acts directly on the sealing end face, forming the initial and necessary sealing specific pressure, ensuring that the device has good sealing performance from the start. This preload state lays the foundation for the subsequent compensation process. When wear occurs, the further deformation of spring 401 (increased compression or increased stretch) starts from this preload state. The resulting change in compensation force is continuous and predictable, thus ensuring that the sealing specific pressure can be maintained within a relatively stable, preset range during the wear process. With its simple structure, rapid response, and reliable operation, the spring 401, as a standard mechanical component, is maturely manufactured, cost-controllable, and has stable performance. Its force output responds directly to displacement changes without delay and can instantly follow wear displacement to generate compensation force. Compared with other possible compensation methods (such as hydraulic, pneumatic, or electric compensation), the purely mechanical spring 401 compensation does not require external energy or complex control systems. It has a compact structure, strong anti-pollution ability, and is especially suitable for use in rotating equipment with limited space and harsh environments. The elastic characteristics of the spring 401 also allow it to tolerate a certain range of assembly errors and thermal deformation. The continuous, adaptive compensating force provided by spring 401, together with the precise axial guidance provided by support and positioning assembly 300 and the precise fit of rotating ring assembly 200 and stationary ring assembly 100, ensures that the thrust of spring 401 is transmitted along the correct axial direction, avoiding uneven force on the sealing surface due to off-center loading. The precision machining of rotating ring assembly 200 and stationary ring assembly 100 ensures that the sealing end face can achieve uniform and stable contact under the thrust of spring 401. Optionally, spring 401 can be a variable pitch helical spring, conical spring, or a combination spring. Optionally, a combination spring can be a combination of a large spring and a small spring.Optionally, the combined spring is a spring sleeved on a bolt, with the bolt used for axial guidance and for adjusting the preload of the spring.

[0037] In this embodiment, the compensation component 400 includes a shape memory alloy elastic element and a temperature control device. The shape memory alloy elastic element is disposed between the front slip ring 202 and the rear slip ring 203. The temperature control device is disposed within the accommodating space 500 formed by the front slip ring 202, the rear slip ring 203, and the rotating shaft 201, and / or within the cylindrical shell 1011. The preload of the shape memory alloy elastic element is controlled by controlling the temperature within the accommodating space 500. Optionally, the preload of the shape memory alloy elastic element can be automatically adjusted by utilizing the placement environment of the device and the self-heating generated by rotation.

[0038] like Figure 1As shown, in this embodiment, the spring 401 is axially arranged between the front slip ring 202 and the rear slip ring 203 of the moving ring assembly 200, or the spring 401 is axially arranged between the front slip ring 202 and the cylindrical shell 1011 of the stationary ring assembly 100, or the spring 401 is axially arranged between the rear slip ring 203 and the half ring 204 of the moving ring assembly 200, or the spring 401 is axially arranged between the rear slip ring 203 and the cylindrical shell 1011 of the stationary ring assembly 100. Spring 401 is positioned between the front slip ring 202 and the rear slip ring 203. The compressive force of spring 401 acts directly between the two components of the rotating ring assembly 200, making the force transmission path the most direct and efficient. The force of spring 401 is transmitted through the contact surface between the rear slip ring 203 and the front slip ring 202, with almost no friction loss or deformation in the intermediate links, enabling the compensation force to be applied to the front slip ring 202, which performs the sealing function, most quickly. The structure is compact, with the force application mechanism fully integrated inside the rotating ring assembly 200, minimizing the structural dependence on the stationary ring assembly 100. The contact surfaces between the front slip ring 202 and the rear slip ring 203 are required to have high flatness and fitting accuracy to ensure uniform transmission of the force of spring 401. Spring 401 is arranged between the front slip ring 202 and the cylindrical shell 1011 of the stationary ring assembly 100, forming a "dynamic-static" force application structure that spans the rotating and stationary parts, realizing the dynamic-static separation of force transmission. One end of spring 401 rests on the stationary cylindrical shell 1011, and the other end acts on the rotating front slip ring 202, so that the compensating force source applied to the front slip ring 202 is itself stationary, avoiding the dynamic balance challenges that may be brought about by arranging the force application element inside the rotating part. However, this design will form a friction pair with relative motion between the rotating slip ring and the stationary spring 401 and cylindrical shell 1011. Appropriate guiding or anti-torsion structures need to be set to prevent the spring 401 from twisting and failing, and the potential impact of the friction here on the compensating force transmission efficiency needs to be considered. Spring 401 is positioned between the rear slip ring 203 and the half-ring, with spring 401 located at the rear end of the moving ring assembly 200, shifting the point of force application backward. The force of spring 401 first acts on the rear slip ring 203, and then is transmitted to the front slip ring 202 through the rear slip ring 203. This arrangement utilizes the rear slip ring 203 as a force distribution and buffer structure, which helps to make the distribution of compensating force more uniform on the end face of the front slip ring 202. At the same time, since the half-ring is used for axial limiting, this arrangement facilitates the pre-tightening installation and adjustment of spring 401. However, in this method, the force transmission path is relatively long, and it is necessary to ensure that the connection between the rear slip ring 203 and the front slip ring 202 (such as through splines, pins, or interference fits) is sufficiently firm to reliably transmit axial force.Spring 401 is arranged between the rear slip ring 203 and the cylindrical shell 1011 of the stationary ring assembly 100. It is a variation of the second "dynamic-static" force application structure, but the force is applied to the rear slip ring 203 instead of the front slip ring 202. Similar to the second scheme, it also achieves dynamic-static separation. The difference is that the force is first applied to the rear slip ring 203 and then transmitted to the front slip ring 202. This provides the possibility for secondary force distribution or setting a floating structure inside the dynamic ring assembly 200. In addition, since the rear slip ring 203 does not directly participate in the end face sealing, the space between it and the cylindrical shell 1011 may be more convenient for arranging a larger size or special form of spring 401. The different axial placements of the spring 401 are essentially different design choices regarding the force transmission path, device structural layout, and interface relationships between rotating and stationary components. When the spring 401 is positioned between the front slip ring 202 and the rear slip ring 203, it prioritizes direct force delivery and structural compactness. When the slip ring is positioned between the front slip ring 202 and the stationary ring housing, or between the rear slip ring 203 and the stationary ring housing, it achieves separation of dynamic and static states and the staticization of the force source, but introduces friction at the rotating-stationary interface. When the slip ring is positioned between the rear slip ring 203 and the half-ring, it utilizes the structure at the rear of the moving ring assembly 200 for force transmission and integration. These solutions all achieve the core automatic compensation function, but each exhibits different characteristics in terms of force transmission efficiency, structural complexity, component precision requirements, installation convenience, and dynamic stability, providing flexible design choices to adapt to different application scenarios, space constraints, and performance priorities.

[0039] The assembly method of the automatic compensation rotary dynamic seal device in this embodiment, used for the conversion of the above-mentioned automatic compensation rotary dynamic seal device, includes the following steps: From the first end of the rotary fixed ring 101, a plane bearing 302, a front slip ring 202, a spring 401, a rear sliding bearing 303, and a rear slip ring 203 are sequentially installed into the inner cavity of the rotary fixed ring 101, such that the plane bearing 302 is axially supported between the front slip ring 202 and the rotary positioning, and the rear sliding bearing 303 is radially supported between the rear slip ring 203 and the rotary fixed ring 101; from the first end of the rotary fixed ring 101, a planar bearing 302, a front slip ring 202, a spring 401, a rear sliding bearing 303, and a rear slip ring 203 are sequentially installed into the inner cavity of the rotary fixed ring 101, such that the planar bearing 302 is axially supported between the front slip ring 202 and the rotary positioning, and the rear sliding bearing 303 is radially supported between the rear slip ring 203 and the rotary fixed ring 101; from the first end of the rotary fixed ring 101, a planar bearing 302 is axially supported between the front slip ring 202 and the rotary positioning, and the rear sliding bearing 303 is radially supported between the rear slip ring 203 and the rotary fixed ring 101; from the first end of the rotary fixed ring 101, a planar bearing 302 is axially supported between the front slip ring 202 and the rotary positioning, and the rear sliding bearing 401 ... The second end of 1 is sequentially fitted with a front sliding bearing 301 and a rotating shaft 201, so that the front sliding bearing 301 is supported axially and radially between the rotating shaft 201 and the rotating fixed ring 101, and the rotating shaft 201 passes through the plane bearing 302, the front slip ring 202, the spring 401, the rear sliding bearing 303 and the rear slip ring 203; a half ring 204 is installed at the first end of the rotating fixed ring 101 to lock the rear slip ring 203, and the spring 401 generates preload; static sealing rings 102 are installed on the outer circumference of the rotating fixed ring 101 and on the mating surface, respectively. The assembly method of the automatic compensation rotary dynamic sealing device of the present invention involves sequentially installing a planar bearing 302, a front slip ring 202, a spring 401, a rear sliding bearing 303, and a rear slip ring 203 from the first end of the rotary fixed ring 101 into the inner cavity. This defines a modular, layered, and progressive internal component assembly logic. Starting from the core cavity of the stationary ring assembly 100 (the inner cavity of the rotary fixed ring 101), the internal motion and support chain is first established. The planar bearing 302, which bears the axial force, is installed first, followed by the front slip ring 202, which forms the main sealing surface. Then, the spring 401, which provides compensation force, is placed next, followed by the rear sliding bearing 303, and finally the rear slip ring 203. This sequence ensures that each subsequently installed component can use the component already in place in front of it as a positioning or support reference, achieving orderly and precise placement of complex components within a limited space. In particular, placing the spring 401 between the front slip ring 202 and the rear slip ring 203 facilitates observation and adjustment of its pre-compression state before final locking. The installation path of the rotary drive shaft system is constructed by sequentially installing the front sliding bearing 301 and the rotary shaft 201 from the second end of the rotating ring 101. Installation from the opposite end to the first end avoids interference with the internal components already installed at the first end. The front sliding bearing 301 is installed first and positioned in the inner cavity, and then the rotary shaft 201 is inserted. This ensures that the rotary shaft 201 can accurately use the front sliding bearing 301 as the initial guide and smoothly pass through all the internal components previously installed at the first end (plane bearing 302, center hole of front slip ring 202, inner diameter of spring 401, rear sliding bearing 303, center hole of rear slip ring 203). This insertion process itself is also a preliminary check of the concentricity of the internal components.A half-ring 204 is installed at the first end of the rotating fixed ring 101 to lock the rear slip ring 203 and generate preload on the spring 401, thus completing the integration of the rotating ring assembly 200 and initializing the compensation function. The half-ring 204 (such as a snap ring or locking ring) is installed to provide the final axial hard limit on the rear slip ring 203, thereby integrating all the previously installed internal floating components (front slip ring 202, spring 401, rear slip ring 203, etc.) into a rotating ring assembly 200 that can rotate as a whole with the rotating shaft 201. By precisely controlling the installation position of the half-ring 204 (for example, by selecting adjusting shims of different thicknesses or tightening the threads to a specific torque), the initial compression of the spring 401 can be precisely set, thereby applying and locking the required initial preload, directly setting the initial sealing pressure of the sealing end face, and ensuring good sealing performance when the device is started. Installing static sealing rings 102 on the outer circumference and mating surface of the rotating fixed ring 101 is the final step in achieving static sealing of the device. After the internal rotating components and shaft system are fully assembled and debugged, the static sealing rings 102 are installed last. This avoids damage to these relatively delicate elastic seals during complex internal assembly, ensuring interface sealing between the rotating fixed ring 101 and the external equipment housing, thus completing the encapsulation of the entire device. The assembly sequence reflects a clear functional implementation logic: first, the core internal functional modules (sealing, compensation, support) are assembled; then, the rotating drive shaft is introduced and aligned with the internal modules; next, axial locking completes the integration and functional initialization of the internal modules (applying preload); finally, the external static interface seal is addressed. This sequence avoids repeated disassembly and assembly, reduces the risk of damage to precision components (such as sealing surfaces and bearings) due to improper operation, and ensures that key functions (such as coaxiality and preload) are gradually established and verified during assembly. The assembly method of the automatic compensation rotary dynamic seal device of this invention provides a standardized operation process that is repeatable, efficient, and ensures assembly accuracy by optimizing the component loading sequence, path, and key operation nodes. This reduces excessive reliance on manual skills and is beneficial for large-scale production and quality control. During the assembly process, the alignment, pre-tightening, and integration of each functional component are naturally achieved. In particular, the key steps of "loading from both ends sequentially" and "final axial locking" effectively ensure the coaxiality of the rotating shaft 201 and the dynamic ring assembly 200, and accurately set the initial preload of the spring 401. The logically clear step arrangement minimizes the risk of interference and damage between components, realizes the design function of the automatic compensation rotary dynamic seal device, and ensures its performance consistency and reliability.

[0040] The automatic compensation rotary dynamic seal method of this embodiment uses the above-mentioned automatic compensation rotary dynamic seal device and includes the following steps: The first end of the rotating fixed ring 101 of the automatic compensation rotary dynamic seal device is installed into the inner cavity of the equipment housing, and the outer edge plate 1012 of the rotating fixed ring 101 is fixedly connected to the end face of the equipment housing, so that the rotating shaft 201 is connected to the transmission part of the equipment housing; a rotational power source is connected to the connecting section 2011 of the rotating shaft 201 and drives the rotating shaft 201 to rotate, thereby driving the transmission part inside the equipment housing to rotate. The rotating shaft 201 passes through the front sliding bearing 301, the plane bearing 302, and the rear sliding bearing 303 at multiple points. The rotating shaft 201 is supported three-dimensionally within the rotating fixed ring 101 to ensure its rotational stability and the coaxiality of the rotating shaft 201, the front slip ring 202, and the rear slip ring 203. During long-term rotation or frequent start-stop of the automatic compensation rotary dynamic seal device, the front sliding bearing 301, the plane bearing 302, and the rear sliding bearing 303 work together to ensure that the sealing pair formed by the front slip ring 202 and the rear slip ring 203 only experiences axial wear. When the sealing pair formed by the front slip ring 202 and the rear slip ring 203 experiences axial wear, the spring 401 with preload is used for automatic axial compensation to ensure the effective sealing effect of the sealing pair. The present invention provides an automatic compensation rotary dynamic sealing method. The rotating fixed ring 101 of the device is installed into the inner cavity of the equipment housing, and its outer edge plate 1012 is fixed to the end face of the housing. Simultaneously, the rotating shaft 201 is connected to the internal transmission part of the equipment, achieving standardized and interface-based docking between the sealing device and the main equipment. The fixing of the rotating fixed ring 101 to the cylindrical housing 1011 provides a stable static sealing reference, while the connection between the rotating shaft 201 and the internal transmission ensures the continuity of power transmission. This allows the sealing device to be conveniently integrated into different types of rotating equipment as a pre-installed and adjusted independent component, improving the versatility of application and installation efficiency. A rotary power source drives the rotating shaft 201 to rotate, and the power is transmitted to the inside of the equipment through the shaft. At the same time, the rotating shaft 201 is supported in a multi-point, three-dimensional manner by the front sliding bearing 301, the plane bearing 302, and the rear sliding bearing 303. The multi-point, three-dimensional support of the support positioning component 300, with the three bearings distributed axially in space (multi-point), respectively bearing radial and axial constraints (three-dimensional), together constitute a spatial statically determinate support system. This system can effectively suppress the radial runout, axial movement, and bending deformation of the rotating shaft 201 under complex loads, thereby ensuring that the rotating shaft 201 and the front slip ring 202 and the rear slip ring 203 installed on it have extremely high rotational coaxiality and operational stability. This is a prerequisite for achieving effective dynamic sealing, because excellent coaxiality can ensure uniform force on the sealing end face and avoid uneven wear.With the synergistic effect of the support and positioning component 300, the sealing pair formed by the front slip ring 202 and the rear slip ring 203 only experiences axial wear. The optimized multi-point three-dimensional support greatly restricts the undesirable movements of the rotating shaft 201 and the moving ring assembly 200 other than the axial direction (such as radial wobble and angular sway). This restricts the relative movement between the sealing pair (usually referring to the end face of the front slip ring 202 and the stationary sealing surface) mainly in the preset axial direction, so that the wear of the sealing material is mainly manifested as a uniform thinning along the axial direction, rather than irregular radial wear or local decay. The predictability and controllability of this wear mode lay the foundation for subsequent directional compensation. When axial wear occurs in the sealing pair, axial automatic compensation is achieved through the pre-compressed spring 401, realizing a self-adjusting working cycle. Axial wear causes the front slip ring 202 to have a slight axial displacement tendency. This displacement tendency directly or indirectly causes a further change in the compression of the pre-compressed spring 401. According to the force-displacement characteristics of the spring 401, the spring 401 then generates an increased restoring force. This force acts as a compensating force to push the front slip ring 202 to move axially, accurately filling the gap increment caused by wear, thereby dynamically maintaining the contact pressure (sealing specific pressure) between the sealing end faces within the preset effective range. The entire process does not require external sensors, controllers, or manual intervention and is a pure, continuous mechanical closed-loop feedback regulation. This invention presents an automatic compensation method for rotary dynamic seals, systematically showcasing a complete technical chain from installation and integration, stable operation, directional wear to automatic compensation. It provides a modular sealing solution that is ready to use and operates stably. Through precise mechanical design (multi-point three-dimensional support), it simplifies the complex wear problem of the sealing pair into a controllable, single-degree-of-freedom axial wear problem, greatly improving the reliability and lifespan predictability of the seal. It realizes a self-reliant, mechanically closed-loop real-time wear compensation mechanism, enabling the sealing performance to be self-maintained throughout the entire life cycle of the equipment. This solves the pain point of traditional rotary dynamic seals requiring downtime maintenance due to wear leakage, and achieves dynamic self-repair and long-term stability of the sealing state.

[0041] In practice, an automatic compensation rotary dynamic seal device is provided, comprising components such as a rotary stationary ring 101, a front sliding bearing 301, a plane bearing 302, a front slip ring 202, a rear slip ring 203, a rear sliding bearing 303, a spring 401, a half ring 204, a dynamic seal ring 600, and a static seal ring 102. The assembly relationship of each component and the automatic compensation mechanism are as follows: The rotating fixed ring 101 is fixed to the end face of the equipment housing by bolts. The front sliding bearing 301 is interference-fitted onto the outer circle of the rotating shaft 201 (e.g., using the principle of thermal expansion and contraction). The outer ring of the front sliding bearing 301 is clearance-fitted with the inner hole of the rotating fixed ring 101. The front sliding ring 202 and the rear sliding ring 203 are snapped together by a half-ring 204 to form an integrated sealing pair. The planar bearing 302 is embedded between the front end face of the front sliding ring 202 and the rear end face of the rotating fixed ring 101 (inner ring plate 1013) to bear radial loads and ensure the coaxiality of the sealing pair during rotation. The inner ring of the moving bearing 303 is interference-fitted with the rear slip ring 203 (e.g., using the principle of thermal expansion and contraction to achieve interference fit), and the outer ring supports the inner hole of the rotating fixed ring 101 (cylindrical housing 1011). The spring 401 is evenly distributed circumferentially between the rear end face of the front slip ring 202 and the rear slip ring 203 and is in a pre-compressed state. The moving seal ring 600 is respectively set at the snap-fit ​​(sleeve-fit) of the front slip ring 202 and the rear slip ring 203. The static seal ring 102 is respectively installed on the static sealing surface of the rotating fixed ring 101 and the equipment housing, and the mating surface of the rear slip ring 203 and the rear sliding bearing 303. When the sealing gap increases due to long-term friction and wear, the axial preload of the spring 401 pushes the rear slip ring 203 and drives the front slip ring 202 to move forward axially along the rotating shaft 201, filling the gap caused by wear in real time and ensuring that the sealing pair always maintains effective contact. The presence of the front sliding bearing 301 and / or the plane bearing 302 can prevent uneven wear of the sealing pair during rotation, further extending the service life of the seals. For rotating equipment of different specifications, this device can be flexibly adapted to rotating shafts 201 of different diameters by replacing the half ring 204 of the corresponding size or adjusting the preload parameter of the spring 401.

[0042] The installation process of the automatic compensation rotary dynamic seal device: No special positioning fixtures are required during installation. Simply assemble the components in the following order: "rotary fixed ring 101 → flat bearing 302 → front slip ring 202 → spring 401 → rear sliding bearing 303 → rear slip ring 203 → front sliding bearing 301 → rotating shaft 201 → half ring 204 → static seal ring 102". This significantly reduces the requirements for installation accuracy. Furthermore, the friction surfaces of the sealing pair are made of silicon carbide hard alloy, possessing excellent wear resistance and resistance to particle erosion, making it suitable for harsh working conditions such as high pressure, high speed, and particulate media. The core components are made of high-strength aluminum alloy, achieving a lightweight design for the overall structure, facilitating on-site disassembly and maintenance, and effectively improving the practicality and adaptability of the device.

[0043] The beneficial effects of an automatic compensation rotary dynamic seal device: 1. Through the built-in real-time automatic compensation mechanism, the gaps caused by long-term friction and wear of the seals are accurately offset, which significantly improves the sealing reliability and ensures that the seals can remain stable for a long time under harsh conditions such as high pressure, high speed or particulate media, effectively reducing the risk of leakage. 2. Abandon the traditional manual periodic maintenance model, reduce labor and material costs, avoid the impact of unplanned downtime on production efficiency, and eliminate the hidden danger of improper manual operation exacerbating seal failure; 3. Simplify the design of the compensation structure, reduce the installation accuracy requirements, and make it flexible to adapt to rotating equipment of different specifications, thus broadening the application scenarios to meet diverse industrial needs. 4. Enhance the wear resistance and impact resistance of the device, extend its overall service life, and improve the long-term economic efficiency; 5. Optimize the structural layout to achieve lightweight and miniaturization, which facilitates on-site installation and daily maintenance, further improving the convenience and practicality in actual applications.

[0044] Matters not covered in this invention are common knowledge.

[0045] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0046] The embodiments described above are merely examples of several implementations of the present invention, and while the descriptions are specific and detailed, they should not be construed as limiting the scope of the invention. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of the present invention, and these modifications and improvements all fall within the scope of protection of the present invention.

[0047] The above description is merely a preferred embodiment of the present invention and is not intended to limit the invention. Various modifications and variations can be made to the present invention by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. An automatic compensation rotary dynamic sealing device, characterized in that, include: A stationary ring assembly (100) is used to fix the device housing to the end face and provide a stationary sealing reference surface; The dynamic ring assembly (200) is fitted inside the stationary ring assembly (100) and forms an axial and radial dynamic seal fit with the stationary ring assembly (100) to form the main sealing surface; The support positioning component (300) is movably supported between the stationary ring component (100) and the rotating ring component (200), and moves in conjunction with the rotating ring component (200) to bear the radial load of the rotating ring component (200) and ensure the coaxiality of the rotating ring component (200) and the stationary ring component (100) when they rotate. The compensation component (400), connected to the rotating ring component (200), is used to apply a preload force axially toward the rotating ring component (200) toward the stationary ring component (100) to achieve automatic wear compensation.

2. The automatic compensation rotary dynamic sealing device according to claim 1, characterized in that, The stationary ring assembly (100) includes a rotating stationary ring (101); The rotating fixed ring (101) includes a cylindrical shell (1011), an outer edge plate (1012) and an inner ring plate (1013), and the first end of the cylindrical shell (1011) is used for insertion and assembly into the equipment housing; The outer wall of the cylindrical shell (1011) extends radially outward to form an outer edge plate (1012), which is used to axially fit and connect with the end face of the equipment shell; The inner wall of the cylindrical shell (1011) extends radially inward to form an inner ring plate (1013), which is used for the moving ring assembly (200) to be inserted through and to be movably engaged with the moving ring assembly (200) via the support positioning assembly (300).

3. The automatic compensation rotary dynamic sealing device according to claim 2, characterized in that, The stationary ring assembly (100) also includes a stationary sealing ring (102), which is disposed on the mating surface of the outer edge plate (1012) and / or the outer side wall of the cylindrical shell (1011).

4. The automatic compensation rotary dynamic sealing device according to claim 2, characterized in that, The rotating ring assembly (200) includes a rotating shaft (201), a front slip ring (202), a rear slip ring (203), and a half ring (204). The rotating shaft (201) passes through the second end of the cylindrical shell (1011) into the inner cavity of the cylindrical shell (1011) and is movably engaged with the inner ring plate (1013) via the support and positioning assembly (300); The front slip ring (202) and the rear slip ring (203) are sequentially inserted into the inner cavity of the cylindrical shell (1011) from the first end of the cylindrical shell (1011) and fitted onto the outside of the rotating shaft (201). The front slip ring (202) is axially movable with the inner ring plate (1013) via the support positioning assembly (300). The compensation component (400) is disposed on at least one of the front slip ring (202), the rear slip ring (203), or between the front slip ring (202) and the rear slip ring (203); The semi-ring (204) is snapped onto the rotating shaft (201) by the first end of the cylindrical shell (1011) and abuts against the rear slip ring (203) along the axial direction and limits the rear slip ring (203).

5. The automatic compensation rotary sealing device according to claim 4, characterized in that, The rotating shaft (201) includes a connecting section (2011), a surface-fitting section (2012), a plug-in section (2013), and a snap-fit ​​positioning section (2014) arranged in sequence. The connecting section (2011) is arranged extending outward along the axial direction from the second end of the cylindrical shell (1011), and the connecting section (2011) is used for fixed connection with the rotating power source; The surface-fitting section (2012) is arranged to extend outward in a radial direction. The surface-fitting section (2012) is used to move and engage with the inner ring plate (1013) in the axial and radial directions via the support positioning component (300) and to ensure the coaxiality of the rotating shaft (201) when it rotates. The plug section (2013) is arranged axially into the cylindrical shell (1011) and is dynamically sealed and / or circumferentially limited with the front slip ring (202) and / or the rear slip ring (203); The snap-fit ​​positioning section (2014) is arranged extending axially outward from the first end of the cylindrical shell (1011). The snap-fit ​​positioning section (2014) is used to snap-fit ​​with the half ring (204) to abut against the rear slip ring (203) axially and limit the rear slip ring (203).

6. The automatic compensation rotary dynamic sealing device according to claim 4, characterized in that, It also includes an auxiliary sealing assembly, which includes a dynamic sealing ring (600), the inner ring wall of the front slip ring (202) being sealed to the rotating shaft (201) via the dynamic sealing ring (600), and / or the outer ring wall of the front slip ring (202) being sealed to the cylindrical shell (1011) via the dynamic sealing ring (600); and / or The compensation component (400) is located within the accommodating space (500) formed by the front slip ring (202), the rear slip ring (203) and the rotating shaft (201).

7. The automatic compensation rotary dynamic sealing device according to any one of claims 1 to 6, characterized in that, The support and positioning assembly (300) includes a front sliding bearing (301), a plane bearing (302) and a rear sliding bearing (303). The front sliding bearing (301), the plane bearing (302) and the rear sliding bearing (303) are arranged between the dynamic ring assembly (200) and the stationary ring assembly (100) and are arranged sequentially from front to back along 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 slip 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 slip ring (203) of the moving ring assembly (200) and the cylindrical shell (1011) of the stationary ring assembly (100).

8. The automatic compensation rotary sealing device according to any one of claims 1 to 6, characterized in that, The compensation component (400) uses a spring (401) with preload or pretension applied. The spring (401) is arranged axially between the front slip ring (202) of the moving ring assembly (200) and the rear slip ring (203) of the moving ring assembly (200), or the spring (401) is arranged axially between the front slip ring (202) of the moving ring assembly (200) and the cylindrical shell (1011) of the stationary ring assembly (100), or the spring (401) is arranged axially between the rear slip ring (203) of the moving ring assembly (200) and the half ring (204) of the moving ring assembly (200), or the spring (401) is arranged axially between the rear slip ring (203) of the moving ring assembly (200) and the cylindrical shell (1011) of the stationary ring assembly (100).

9. An assembly method for an automatic compensation rotary dynamic seal device, characterized in that, The conversion of the automatic compensation rotary dynamic seal device according to any one of claims 1 to 8 includes the following steps: From the first end of the rotating fixed ring (101), a plane bearing (302), a front slip ring (202), a spring (401), a rear sliding bearing (303), and a rear slip ring (203) are sequentially installed into the inner cavity of the rotating fixed ring (101), so that the plane bearing (302) is axially supported between the front slip ring (202) and the rotating positioning, and the rear sliding bearing (303) is radially supported between the rear slip ring (203) and the rotating fixed ring (101); The front sliding bearing (301) and the rotating shaft (201) are sequentially installed from the second end of the rotating ring (101), so that the front sliding bearing (301) is supported axially and radially between the rotating shaft (201) and the rotating ring (101), and the rotating shaft (201) passes through the plane bearing (302), the front slip ring (202), the spring (401), the rear sliding bearing (303), and the rear slip ring (203). A half-ring (204) is installed at the first end of the rotating fixed ring (101) to lock the rear slip ring (203) and to generate preload in the spring (401); Static sealing rings (102) are installed on the outer circumference of the rotating fixed ring (101) and on the mating surface, respectively.

10. An automatic compensation method for rotary dynamic sealing, characterized in that, The automatic compensation rotary dynamic seal device according to any one of claims 1 to 8 includes the following steps: The first end of the rotating fixed ring (101) of the automatic compensation rotating dynamic sealing device is installed into the inner cavity of the equipment housing, and the outer edge plate (1012) of the rotating fixed ring (101) is fixedly connected to the end face of the equipment housing, so that the rotating shaft (201) is connected to the transmission part of the equipment housing. A rotary power source is connected to the connecting section (2011) of the rotary shaft (201) and drives the rotary shaft (201) to rotate, thereby driving the transmission part inside the equipment housing to rotate. The rotary shaft (201) is supported in the rotary ring (101) in a multi-point and three-dimensional manner by the front sliding bearing (301), the plane bearing (302), and the rear sliding bearing (303) to ensure the rotational stability of the rotary shaft (201) and to ensure the coaxiality of the rotary shaft (201), the front slip ring (202), and the rear slip ring (203). During the long-term rotation or frequent start-stop process of the automatic compensation rotary dynamic seal device, through the synergistic action of the front sliding bearing (301), the plane bearing (302) and the rear sliding bearing (303), the sealing pair formed by the front slip ring (202) and the rear slip ring (203) only experiences axial wear. When the sealing pair formed by the front slip ring (202) and the rear slip ring (203) experiences axial wear, axial automatic compensation is performed by a spring (401) with preload applied to ensure the effective sealing effect of the sealing pair.

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