Performance-controllable mechanical sealing device

Abstract

Disclosed in the present invention is a performance-controllable mechanical sealing device, comprising: a movable ring, a shaft sleeve, an O-shaped sealing ring, and an adjusting ring. The movable ring is mounted on the shaft sleeve, the shaft sleeve is provided with a raised ring, and a sealing recess is formed in the side face of the raised ring adjacent to the back face of the movable ring; the O-shaped sealing ring is arranged in the sealing recess so as to seal a gap between one side face of the raised ring and the back of the movable ring; and the adjusting ring is arranged in the sealing recess and is nested with the O-shaped sealing ring so as to adjust the position of a high-low pressure boundary on the back face of the movable ring.

Description

Performance-controlled mechanical sealing device

[0001] CROSS-REFERENCE TO RELATED APPLICATIONS

[0002] This application is based on the Chinese patent application with application number: 202311634584.3 and application date of December 1, 2023, and claims the priority of the Chinese patent application. The entire content of the Chinese patent application is hereby introduced into this application as a reference. Technical Field

[0003] The present invention relates to the technical field of fluid sealing, and in particular to a performance-controllable mechanical sealing device. Background Art

[0004] Mechanical seals, as shaft end seals for rotating machinery, are widely used in petrochemical, nuclear energy, aerospace, and other fields. They can operate under high parameters, effectively preventing media leakage and ensuring the normal operation of equipment.

[0005] The pressure distribution, temperature distribution, and deformation of a mechanical seal's end faces directly impact its performance and lifespan. Improper seal design can lead to unexpected sealing performance, causing excessive friction and wear on the end faces, which accelerates seal aging and damage. Therefore, ensuring the rationality of mechanical seal design is crucial for improving its performance and lifespan. In practical applications, optimizing the seal's structure and materials, as well as adopting appropriate operating methods and maintenance measures, can effectively improve mechanical seal performance.

[0006] Existing seal structure designs typically employ a forward design model, whereby multi-field coupled calculations are performed on the seal's operational capabilities during the design phase to determine the ultimate operational capability parameter range for the seal end face under the influence of flow, thermal, and deformation fields. Experimentation is then used to continuously refine and optimize the structural parameters to achieve a seal design that meets the required operating conditions. However, if external operating conditions significantly change and the seal structure ages, the existing seal structure design becomes difficult to effectively adjust for sealing performance, and the existing seal structure design may no longer meet the requirements.

[0007] Summary of the Invention

[0008] The present invention aims to solve at least one of the technical problems existing in the prior art. To this end, one object of the present invention is to provide a performance-controllable mechanical seal device that can effectively adjust the sealing performance of an already designed mechanical seal device to meet the sealing requirements of the mechanical seal device, enabling the mechanical seal device to be used in a variety of working conditions.

[0009] A performance-controllable mechanical sealing device according to an embodiment of the present invention includes:

[0010] dynamic ring;

[0011] A shaft sleeve, on which the dynamic ring is mounted, the shaft sleeve having a convex ring, and a sealing groove being provided on a side surface of the convex ring adjacent to the back surface of the dynamic ring;

[0012] an O-shaped sealing ring, the O-shaped sealing ring being disposed in the sealing groove to seal a gap between a side surface of the convex ring and a back of the dynamic ring;

[0013] An adjusting ring is arranged in the sealing groove and nested with the O-ring to adjust the position of the high and low pressure dividing point on the back of the dynamic ring.

[0014] According to the performance-controllable mechanical sealing device of the embodiment of the present invention, the high and low pressure dividing point position between the O-ring and the dynamic ring is adjusted by adjusting the ring, so that the sealing performance of the mechanical sealing device that has been designed can be effectively adjusted, so that the performance-controllable mechanical sealing device can meet the use of various working conditions and the sealing requirements of the mechanical sealing device, avoid or delay leakage problems caused by performance degradation of the sealing device, ensure the safe operation of the equipment using the performance-controllable mechanical sealing device, extend the service life of the equipment using the performance-controllable mechanical sealing device, and improve the reliability and economic benefits of the equipment using the performance-controllable mechanical sealing device.

[0015] In some embodiments, the adjustment ring is tightly nested in the radial outer end of the O-ring and / or the radial inner end of the O-ring.

[0016] In some embodiments, the position variation range of the high and low pressure dividing points is 0 to 0.5 mm.

[0017] In some embodiments, the adjustment ring is made of a hard material.

[0018] In some embodiments, the position of the high and low pressure dividing point is adjusted by selecting the adjustment rings with different radial sizes to be nested in the radial outer end of the O-ring or the radial inner end of the O-ring.

[0019] In some embodiments, when the adjustment ring is nested in the radial outer end of the O-ring, the inner side surface of the adjustment ring is cylindrical; when the adjustment ring is nested in the radial inner end of the O-ring, the outer side surface of the adjustment ring is cylindrical.

[0020] In some embodiments, the adjustment ring is made of a deformable material, and the position of the high and low pressure dividing point is adjusted by adjusting the size of the adjustment ring online.

[0021] In some embodiments, the deformable material is a piezoelectric ceramic.

[0022] In some embodiments, the sealing groove has a rectangular cross-section.

[0023] Additional aspects and advantages of the present invention will be set forth in part in the description which follows and, in part, will be obvious from the description which follows, or may be learned by practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] The above and / or additional aspects and advantages of the present invention will become apparent and readily understood from the following description of the embodiments with reference to the accompanying drawings, in which:

[0025] FIG1 is a schematic diagram of the overall structure of a performance-controllable mechanical sealing device according to an embodiment of the present invention.

[0026] FIG2 is a schematic structural diagram of a partially enlarged portion of FIG1 , illustrating that the adjustment ring is nested in the radial outer end of the O-ring.

[0027] FIG3 is a schematic diagram of an adjusting ring nested at the radial inner end of an O-ring.

[0028] Figure numerals: performance-controllable mechanical sealing device 1000; dynamic ring 100; sleeve 200; convex ring 201; sealing groove 2011; O-ring 300; adjustment ring 400; stationary ring 500; push ring 600; spring 700; secondary sealing structure 800; stationary ring seat 900; sleeve 110; shaft 120. DETAILED DESCRIPTION

[0029] The following describes embodiments of the present invention in detail. Examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended only to explain the present invention and are not to be construed as limiting the present invention.

[0030] The performance-controllable mechanical sealing device 1000 according to an embodiment of the present invention will be described below with reference to FIG. 1 to FIG. 3 .

[0031] As shown in Figures 1 to 3, a performance-controllable mechanical seal device 1000 according to an embodiment of the present invention includes: a dynamic ring 100, a sleeve 200, an O-ring 300, and an adjustment ring 400. The dynamic ring 100 is mounted on the sleeve 200. The sleeve 200 has a convex ring 201. A sealing groove 2011 is provided on one side of the convex ring 201 adjacent to the back of the dynamic ring 100. The O-ring 300 is disposed in the sealing groove 2011 to seal the gap between one side of the convex ring 201 and the back of the dynamic ring 100. The adjustment ring 400 is disposed in the sealing groove 2011 and nested with the O-ring 300 to adjust the position of the high-low pressure dividing point on the back of the dynamic ring 100.

[0032] Specifically, the rotating ring 100 is mounted on the sleeve 200 and fixedly connected to the shaft 120 via the sleeve 200 and the sleeve 110. In other words, the rotating ring 100 can rotate with the shaft 120. The stationary ring 500 is positioned on one side of the rotating ring 100 and is floatingly supported on the stationary ring seat 900 by a push ring 600, a spring 700, and a secondary sealing structure 800. Although the stationary ring 500 does not rotate, it has a floating property that can maintain a relatively stable relative motion relationship between the end faces of the stationary ring 500 and the rotating ring 100 under the action of various forces, preventing the gap between the end faces of the rotating ring 100 and the stationary ring 500 from being too large or too small. Among them, if the gap between the end face of the dynamic ring 100 and the end face of the static ring 500 is too large, it will cause excessive leakage of the performance-controlled mechanical sealing device 1000; if the gap between the end face of the dynamic ring 100 and the end face of the static ring 500 is too small, it will cause the static ring 500 and the dynamic ring 100 to contact and cause rapid damage, thereby reducing the service life of the dynamic ring 100 and the static ring 500.

[0033] The performance-controlled mechanical seal device 1000 achieves a rotary seal through the rotation of the friction pair between the hard dynamic ring 100 and the soft static ring 500. The friction pair between the dynamic ring 100 and the static ring 500 has a certain degree of rigidity. This means that as the relative positions of the dynamic ring 100 and the static ring 500 change, the force exerted by the friction pair on the static ring 500 varies to counteract these changes, maintaining a relatively stable relative motion relationship between the end faces of the static ring 500 and the dynamic ring 100, thus ensuring the sealing performance of the performance-controlled mechanical seal device 1000.

[0034] Since the traditional sealing structure can only meet the working conditions required by the initial design once it is determined, in order to continuously adjust its own performance to adapt to the needs of multiple working conditions, a sealing groove 2011 is provided on the side surface of the convex ring 201 of the sleeve 200 in the embodiment of the present invention, which is adjacent to the back side of the dynamic ring 100, and the O-ring 300 is arranged in the sealing groove 2011. The axial ends of the O-ring 300 are in contact with the dynamic ring 100 and the convex ring 201 respectively, and the position where the O-ring 300 contacts the dynamic ring 100 is the high-pressure and low-pressure dividing point, the radial outer side of the dynamic ring 100 is the high-pressure side, and the radial inner side of the dynamic ring 100 is the low-pressure side.

[0035] The adjustment ring 400 is disposed within the sealing groove 2011 and nested with the O-ring 300. For example, the adjustment ring 400 is nested radially inwardly of the O-ring 300 (as shown in FIG3 ) or radially outwardly of the O-ring 300 (as shown in FIG2 ) to adjust the position of the high- and low-pressure demarcation point on the back of the dynamic ring 100. In other words, the adjustment ring 400 can adjust the radial position of the O-ring 300, thereby changing the contact point between the O-ring 300 and the dynamic ring 100, thereby changing the position of the high- and low-pressure demarcation point on the back of the dynamic ring 100, thereby effectively adjusting the sealing performance of the performance-controllable mechanical seal device 1000. When it is necessary to adjust the sealing performance of the performance-controllable mechanical sealing device 1000, the radial size of the adjusting ring 400 is changed, for example, by selecting and replacing a hard adjusting ring 400 of different radial sizes and nesting it in the radial outer end of the O-ring 300 or the radial inner end of the O-ring 300 to adjust the position of the high-low pressure dividing point, or by adjusting the radial size of the deformable adjusting ring 400 online, squeezing the O-ring 300, so that the O-ring 300 undergoes radial displacement changes, thereby making the contact point between the O-ring 300 and the dynamic ring 100 and the high-low pressure dividing point Changes occur in the radial direction of the back side of the dynamic ring 100, and the pressure changes on the back side of the dynamic ring 100 will change the size of the closing force of the sealing end face. In order to achieve dynamic balance, the thickness of the sealing fluid film will change, causing the pressure distribution between the sealing end faces to change, thereby causing the deformation of the sealing end face to change. The deformation of the sealing end face will cause the shear heating of the fluid and the solid on the sealing end face to change, which in turn affects the pressure distribution on the sealing end face. The above process is repeated continuously and will eventually reach a new equilibrium state, thereby achieving the purpose of regulating the sealing performance and meeting the needs of multiple working conditions.

[0036] According to the performance-controllable mechanical sealing device 1000 of the embodiment of the present invention, the high and low pressure dividing point position between the O-ring and the dynamic ring is adjusted by adjusting the adjustment ring, so that the sealing performance of the mechanical sealing device that has been designed can be effectively adjusted, so that the performance-controllable mechanical sealing device 1000 can meet the use of various working conditions and the sealing requirements of the mechanical sealing device, avoid or delay leakage problems caused by performance degradation of the sealing device, ensure the safe operation of the equipment using the performance-controllable mechanical sealing device 1000, extend the service life of the equipment using the performance-controllable mechanical sealing device 1000, and improve the reliability and economic benefits of the equipment using the performance-controllable mechanical sealing device 1000.

[0037] In some embodiments, the adjustment ring 400 is tightly nested in the radial outer end of the O-ring 300 and / or the radial inner end of the O-ring 300 .

[0038] Specifically, when the adjustment ring 400 is tightly nested in the radial outer end of the O-ring 300, the O-ring 300 can be clamped, thereby changing the radial position of the O-ring 300. The contact point between the O-ring 300 and the dynamic ring 100, that is, the high and low pressure dividing point, will also move inward in the radial direction. The change in the pressure on the back of the dynamic ring 100 will change the pressure distribution between the sealing end faces, thereby causing the sealing end faces to deform. The deformation of the end faces will cause the shear heating of the fluid and the solid on the sealing end faces to change, thereby in turn affecting the pressure distribution on the end faces. The above process repeats itself and eventually reaches a new equilibrium state, thereby achieving the purpose of regulating the sealing performance of the controllable performance mechanical sealing device 1000.

[0039] When the adjusting ring 400 is tightly nested in the radial inner end of the O-ring 300, the O-ring 300 can be stretched, thereby changing the radial position of the O-ring 300. The contact point between the O-ring 300 and the dynamic ring 100, that is, the high and low pressure dividing point, will also move radially outward. The change in the pressure on the back of the dynamic ring 100 will change the pressure distribution between the sealing end faces, thereby causing the sealing end faces to deform. The deformation of the end faces will cause the shear heating of the fluid and the solid on the sealing end faces to change, which in turn affects the pressure distribution on the end faces. The above process repeats itself and eventually reaches a new equilibrium state, thereby achieving the purpose of regulating the sealing performance of the controllable performance mechanical sealing device 1000.

[0040] In some embodiments, the high-low pressure demarcation point position range is 0-0.5 mm. Since the high-low pressure demarcation point has a significant impact on sealing performance, a high-low pressure demarcation point position range of 0-0.5 mm can enable the performance-controllable mechanical sealing device 1000 to achieve the desired sealing performance.

[0041] In some embodiments, the adjustment ring 400 is made of a hard material to ensure the strength of the adjustment ring 400 itself. This allows the O-ring 300 to be effectively expanded or compressed by the adjustment ring 400, ensuring the effectiveness of the adjustment ability of the adjustment ring 400. It also ensures that the adjustment ring 400 will not be damaged by the pressure on the high-pressure side or broken by the O-ring 300 when nested in the radial outer end of the O-ring 300. It also ensures that the adjustment ring 400 will not be damaged by the pressure on the high-pressure side or squeezed by the O-ring 300 when nested in the radial outer end of the O-ring 300.

[0042] In some embodiments, the position of the high- and low-pressure demarcation point is adjusted by selecting adjustment rings 400 of varying radial dimensions and nesting them within the radially outer or radially inner end of the O-ring 300. In other words, by replacing adjustment rings 400 of varying radial dimensions, the radial position of the O-ring 300 can be altered, thereby changing the high- and low-pressure demarcation point on the back of the dynamic ring 100, ensuring that the performance-controllable mechanical seal device 1000 achieves the desired sealing performance.

[0043] In some embodiments, when the adjustment ring 400 is nested within the radially outer end of the O-ring 300, the inner surface of the adjustment ring 400 is cylindrical; when the adjustment ring 400 is nested within the radially inner end of the O-ring 300, the outer surface of the adjustment ring 400 is cylindrical. In other words, the side of the adjustment ring 400 that contacts the O-ring 300 is cylindrical, matching the shape of the O-ring 300 and facilitating installation of the adjustment ring 400 on the O-ring 300.

[0044] In some embodiments, the adjustment ring 400 is made of a deformable material, and the position of the high and low pressure dividing point can be adjusted by adjusting the size of the adjustment ring 400 online.

[0045] Specifically, when an adjustment ring 400 made of a deformable material is installed at the radially outer end and / or the radially inner end of the O-ring 300. When the sealing performance needs to be adjusted, the radial dimension of the adjustment ring 400 can be adjusted online to change the position of the high-low pressure boundary, thereby avoiding the need to replace an adjustment ring 400 with a different radial dimension, thereby improving adjustment efficiency. When an adjustment ring 400 made of a deformable material can be installed at both the outer and inner ends of the O-ring 300, the adjustment ring 400 can be adjusted online, allowing the adjustment ring 400 to adjust the O-ring 300 from both the radially outer and radially inner ends, resulting in a good adjustment effect and high adjustment efficiency.

[0046] In some embodiments, the deformable material is piezoelectric ceramic. That is, using piezoelectric ceramic to make the adjustment ring 400 allows for online adjustment of the ring's dimensions, thereby causing the O-ring 300 to radially shift, thereby changing the position of the high- and low-pressure demarcation point, and achieving online adjustment of the sealing performance of the controllable mechanical seal device 1000.

[0047] In some embodiments, the cross section of the sealing groove 2011 is rectangular, which is convenient for processing and installation of the O-ring 300 and the adjustment ring 400.

[0048] Throughout this specification, references to terms such as "one embodiment," "some embodiments," "illustrative embodiments," "examples," "specific examples," or "some examples" indicate that the specific features, structures, or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

[0049] While embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions, and variations may be made to the embodiments without departing from the principles and spirit of the invention, and that the scope of the invention is defined by the claims and their equivalents.

Claims

1. A performance controllable mechanical sealing device, characterized in that: include: Moving ring; A shaft sleeve, on which the moving ring is mounted, the shaft sleeve having a convex ring, and a sealing groove is provided on a side surface of the convex ring adjacent to the back surface of the moving ring; An O-shaped sealing ring, the O-shaped sealing ring being arranged in the sealing groove to seal a gap between a side surface of the convex ring and a back of the dynamic ring; An adjusting ring is arranged in the sealing groove and is nested with the O-ring to adjust the position of the high and low pressure dividing point on the back of the dynamic ring.

2. The performance controllable mechanical sealing device according to claim 1, characterized in that: The adjusting ring is tightly nested in the radial outer end of the O-ring and / or the radial inner end of the O-ring.

3. The performance controllable mechanical sealing device according to any one of claims 1 to 2, characterized in that: The position variation range of the high and low pressure dividing points is 0 to 0.5 mm.

4. The performance controllable mechanical sealing device according to any one of claims 1 to 3, characterized in that: The adjusting ring is made of hard material.

5. The performance controllable mechanical sealing device according to any one of claims 1 to 4, characterized in that: The position of the high-low pressure dividing point is adjusted by selecting the adjustment ring with different radial sizes to be nested in the radial outer end of the O-ring or the radial inner end of the O-ring.

6. The performance-controllable mechanical sealing device according to any one of claims 1 to 5, characterized in that: When the adjustment ring is nested in the radial outer end of the O-ring, the inner side surface of the adjustment ring is cylindrical; when the adjustment ring is nested in the radial inner end of the O-ring, the outer side surface of the adjustment ring is cylindrical.

7. The performance-controllable mechanical sealing device according to any one of claims 1 to 6, characterized in that: The adjustment ring is made of a deformable material, and the position of the high and low pressure dividing point can be adjusted by adjusting the size of the adjustment ring online.

8. The performance controllable mechanical sealing device according to claim 7, characterized in that: The deformable material is piezoelectric ceramics.

9. The performance-controllable mechanical sealing device according to any one of claims 1 to 8, characterized in that: The cross section of the sealing groove is rectangular.

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