WO2022143029A1 - Dispositif de scellement étanche mécanique capable de surveiller la quantité d'usure - Google Patents

Dispositif de scellement étanche mécanique capable de surveiller la quantité d'usure Download PDF

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Publication number
WO2022143029A1
WO2022143029A1 PCT/CN2021/135929 CN2021135929W WO2022143029A1 WO 2022143029 A1 WO2022143029 A1 WO 2022143029A1 CN 2021135929 W CN2021135929 W CN 2021135929W WO 2022143029 A1 WO2022143029 A1 WO 2022143029A1
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WIPO (PCT)
Prior art keywords
ring
moving
monitoring
static
moving ring
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PCT/CN2021/135929
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English (en)
Chinese (zh)
Inventor
黄伟峰
尹源
刘向锋
刘莹
李德才
王玉明
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清华大学
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Publication of WO2022143029A1 publication Critical patent/WO2022143029A1/fr

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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16J—PISTONS; CYLINDERS; SEALINGS
    • F16J15/00—Sealings
    • F16J15/16—Sealings between relatively-moving surfaces
    • F16J15/34—Sealings between relatively-moving surfaces with slip-ring pressed against a more or less radial face on one member

Definitions

  • the invention relates to the technical field of mechanical seals, in particular to a mechanical seal device capable of monitoring the wear amount.
  • a mechanical seal device that monitors wear comprising:
  • a moving ring which can be sleeved on the rotating shaft, and the moving ring rotates synchronously with the rotating shaft;
  • a static ring arranged adjacent to the moving ring, the static ring has a measuring end face facing the moving ring, or the moving ring has a measuring end face facing the static ring, the measuring end face is provided with a measuring groove,
  • the opening position of the measuring groove is close to the peripheral edge of the static ring or the moving ring, and the central angles corresponding to the revolving sections of the measuring groove are not identical at different depths;
  • a monitor is arranged on the static ring or the moving ring, and the monitor is used for monitoring the acoustic emission signal generated by the friction pair formed by the static ring and the moving ring.
  • the central angle corresponding to the revolving section of the measuring groove changes gradually with the change of the depth; the central angle corresponding to the revolving section of the measuring groove gradually increases or gradually changes with the change of the depth Small.
  • the cross section of the measuring groove along its own depth direction is triangular, trapezoidal, at least partially circular and/or folded.
  • At least two measurement grooves are formed on the measurement end surface, and the at least two measurement grooves are distributed along the circumference of the static ring at intervals.
  • At least two of the measurement grooves are distributed along the outer periphery of the static ring or the dynamic ring at intervals, and/or at least two of the measurement grooves are distributed along the static ring or the dynamic ring.
  • the inner circumference of the moving ring is spaced apart.
  • thirty-eight of the measurement grooves are set on the measurement end surface; six of the measurement grooves are distributed along the inner circumference of the static ring at intervals, and thirty-two of the measurement grooves spaced along the outer periphery of the stationary ring.
  • At least two of the measurement grooves are distributed at equal intervals along the circumference of the stationary ring.
  • the stationary ring has a measurement end face facing the movable ring, the opening position of the measurement groove is close to the periphery of the stationary ring; the monitor is arranged on the stationary ring.
  • the movable ring has a sealing end face facing the static ring, and the sealing end face is provided with a plurality of T-shaped grooves or arc-shaped grooves, a plurality of the T-shaped grooves or the arc-shaped grooves Evenly spaced distribution along the rotation direction of the moving ring.
  • the mechanical seal device capable of monitoring the wear amount further comprises:
  • a rotating shaft which is rotatably arranged on the base body, the moving ring is sleeved on the rotating shaft, and the moving ring rotates synchronously with the rotating shaft;
  • the static ring seat is fixedly arranged on the base body, and the static ring is arranged on the static ring seat.
  • the mechanical seal device capable of monitoring the wear amount further includes a push ring and a spring, and the static ring, the push ring, the spring and the static ring seat are along the axial direction of the rotating shaft Arranged in sequence, the static ring seat floats and supports the static ring through the spring and the push ring.
  • the above-mentioned mechanical seal device that can monitor the amount of wear, the two opposite surfaces between the moving ring and the static ring form a friction pair, and a gas film with a thickness of only a few microns is formed and maintained between the rotating moving ring and the static static ring. Or a liquid film to block leakage or block direct contact between the moving and stationary rings. Corresponding sound waves or stress waves will be generated when the moving ring or the static ring is rubbed due to inclination, and the monitor can monitor the generated sound wave signals or stress wave signals. At the same time, the measuring grooves opened on the measuring end face of the static ring or the moving ring are distributed on the periphery of the static ring or the moving ring.
  • Sound waves or stress waves are different, and the monitor can monitor the difference between the two kinds of sound waves or stress waves, and then judge whether there is contact friction between the moving ring and the static ring. Further, when the moving ring and the stationary ring are in different friction stages (such as the light friction stage or the severe friction stage), the wear degree of the measuring groove along its own depth direction is different, and the time period when the moving ring friction passes through the measuring groove also occurs accordingly. Variety.
  • the real-time wear condition between the moving ring and the static ring can be accurately known by counting the time period when the friction of the moving ring passes through the measuring groove, so as to realize the online monitoring of the wear amount of the mechanical seal device.
  • FIG. 1 is a schematic structural diagram of a mechanical seal device capable of monitoring wear amount provided by an embodiment of the present invention
  • FIG. 2 is a schematic structural diagram of a static ring according to an embodiment of the present invention.
  • FIG. 3 is a schematic diagram of a static ring wear structure according to an embodiment of the present invention.
  • FIG. 4 is a schematic diagram of a static ring wear structure provided by another embodiment of the present invention.
  • FIG. 5 is a schematic structural diagram of a moving ring according to an embodiment of the present invention.
  • first and second are only used for descriptive purposes, and should not be construed as indicating or implying relative importance or implying the number of indicated technical features. Thus, a feature delimited with “first”, “second” may expressly or implicitly include at least one of that feature.
  • plurality means at least two, such as two, three, etc., unless otherwise expressly and specifically defined.
  • the terms “installed”, “connected”, “connected”, “fixed” and other terms should be understood in a broad sense, for example, it may be a fixed connection or a detachable connection , or integrated; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between the two elements, unless otherwise specified limit.
  • installed may be a fixed connection or a detachable connection , or integrated; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between the two elements, unless otherwise specified limit.
  • a first feature "on” or “under” a second feature may be in direct contact between the first and second features, or the first and second features indirectly through an intermediary touch.
  • the first feature being “above”, “over” and “above” the second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is level higher than the second feature.
  • the first feature being “below”, “below” and “below” the second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature has a lower level than the second feature.
  • a mechanical seal is a shaft sealing device, which is a device that prevents fluid leakage by keeping at least one pair of end faces perpendicular to the rotation axis under the action of fluid pressure and the elastic force of the compensation mechanism and the cooperation of auxiliary seals to keep fit and slide relatively. , which is generally used as a seal for the end of the rotating shaft of rotating machinery.
  • the mechanical seal can use liquid or gas as the sealing medium, among which the spiral groove dry gas seal has excellent comprehensive performance and is particularly widely used. Mechanical seals will inevitably wear to varying degrees during use. Online wear monitoring of mechanical seals is an effective means to ensure their sealing performance.
  • the invention provides a mechanical sealing device capable of monitoring the wear amount on-line. It can be understood that the solutions for online monitoring of the wear amount listed in the following embodiments can also be applied to other seals except dry gas seals after appropriate deformation.
  • an embodiment of the present invention provides a mechanical seal device 10 capable of monitoring the amount of wear, including a moving ring 13 , a static ring 14 and a monitor 19 .
  • the moving ring 13 can be sleeved on the rotating shaft, and the moving ring 13 rotates synchronously with the rotating shaft.
  • the static ring 14 is arranged adjacent to the moving ring 13.
  • the static ring 14 has a measuring end face 141 facing the moving ring 13.
  • a fluid (gas) with a certain pressure can be formed between the static measuring end face 141 and the moving ring 13. or liquid) to prevent leakage of the lubricating medium.
  • the measurement end face 141 is provided with a measurement groove 142 , and the position of the measurement groove 142 is close to the periphery of the stationary ring 14 .
  • the monitor 19 is arranged on the static ring 14 , and the monitor 19 is used to monitor the acoustic emission signal generated by the friction pair formed by the static ring 14 and the moving ring 13 .
  • the revolving section of the measurement groove 142 refers to the plane in the rotation (circumference) direction of the stationary ring 14, that is, the plane passing through the diameter of the stationary ring 14 as the section, and the edge of the groove 142 is measured after cutting the stationary ring 14. enclosed plane.
  • the above-mentioned mechanical seal device 10 that can monitor the amount of wear, the two opposite surfaces between the moving ring 13 and the static ring 14 form a friction pair, and a layer is formed and maintained between the rotating moving ring 13 and the stationary static ring 14. Only a few layers. Micron-thick gas or liquid film to prevent leakage or direct contact between the moving ring 13 and the static ring 14 .
  • the monitor 19 can monitor the generated sound wave signals or stress wave signals.
  • the measurement grooves 142 opened on the measurement end surface 141 of the static ring 14 are distributed on the periphery of the static ring 14.
  • the monitor 19 can monitor the difference between the two kinds of sound waves or stress waves, thereby judging whether contact friction occurs between the moving ring 13 and the static ring 14 .
  • the wear degree of the measuring groove 142 along its own depth direction is different, and then the moving ring 13 rubs the friction passing through the measuring groove 142.
  • the time period also changes accordingly.
  • the real-time wear condition between the moving ring 13 and the static ring 14 can be accurately obtained by counting the time period during which the friction of the moving ring 13 passes through the measuring groove 142 , so as to realize the online monitoring of the wear amount of the mechanical seal device.
  • Acoustic Emission refers to elastic waves (ie stress waves) generated by the rapid release of local energy under the action of a material. Acoustic emission is also sometimes referred to as "stress wave emission”.
  • the possible acoustic emission sources in engineering mainly include: crack generation and expansion, contact friction, impact, wear, plastic deformation, corrosion, fluid leakage, phase transition, etc. Acoustic emission signals can be monitored by acoustic emission sensors. Traditionally, acoustic emission technology is a non-destructive online monitoring technology for structural integrity.
  • microcracks or microcracks expand inside the material (generally speaking, material damage in the macroscopic sense comes from the initiation and development of microcracks), energy is released in the form of elastic waves (ie, stress waves), that is, acoustic emission signals are generated. This makes it possible to predict the risk of structural failure.
  • the acoustic emission signal (frictional acoustic emission) generated by the contact friction of the sealing end face 132 is not only easy to measure, but also easy to separate from various background noises (so it is suitable for use in complex environments such as industrial sites) .
  • the measuring end face 141 is set on the static ring 14 , and the monitor 19 is also set on the static ring 14 .
  • the measuring end surface 141 is not necessarily on the static ring 14 , and when the moving ring 13 is softer than the static ring 14 , it can also be provided on the moving ring 13 with a relatively soft material.
  • the monitoring of the wear amount actually only considers the soft ring in the moving ring 13 and the static ring 14 (in the hard-soft pairing, the hard ring hardly wears), so "the center angle corresponding to the revolving section is not complete at different depths.
  • the same" measuring groove 142 is only effective on the soft ring.
  • the ring on which the measurement grooves 142 are located does not have to be the same ring on which the sensor is installed, as long as the acoustic emission signal emitted when the moving ring 13 and the static ring 14 are in contact can be monitored.
  • the following embodiments continue to be described based on the example of "the measurement end face 141 is on the static ring 14, and the monitor 19 is provided on the static ring 14 at the same time". It should be understood that the technical solution of "the measuring end face 141 is on the moving ring 13 or the static ring 14, and the monitor 19 is on the moving ring 13 or the static ring 14" can be designed as long as it is reasonably deformed.
  • the central angles corresponding to the revolving sections of the measuring grooves 142 are not identical at different depths, and the acoustic emission signals monitored by the monitor 19 within one rotation period of the moving ring 13 are also different when different degrees of wear occur. Finally, the current wear level of the mechanical seal can be effectively judged.
  • the central angle corresponding to the revolving section of the measurement groove 142 gradually increases or decreases with the change of the depth, and then the corresponding central angle of the revolving section of the groove 142 is measured.
  • the cross section of the measuring groove 142 along its depth direction is in the shape of a triangle, a trapezoid, an at least part of a circular arc and/or a broken line, or the like.
  • the triangle, trapezoid, at least part of the arc shape and/or the broken line shape, etc. can be designed with positive and negative as required. As shown in Fig.
  • At least two measurement grooves 142 are formed on the measurement end surface 141 , and the at least two measurement grooves 142 are distributed along the periphery of the stationary ring 14 at intervals.
  • Two or more measuring grooves 142 can significantly improve the monitoring accuracy of the degree of wear of the mechanical device. If there is frictional contact between the moving ring 13 and the static ring 14, there will be two or more disengagements in a relative motion cycle. It can effectively improve the monitoring accuracy of the wear degree of the mechanical device.
  • the at least two measurement grooves 142 are equally spaced along the periphery of the static ring 14, which not only facilitates processing and manufacture, but also enables more uniform monitoring of the duration of disengagement and improves the accuracy of monitoring data.
  • the taper will affect whether the point of frictional contact is located on the inner or outer diameter.
  • at least two measurement grooves 142 are distributed along the outer periphery of the stationary ring 14 at intervals, and/or at least two measurement grooves 142 are along the inner periphery of the stationary ring 14 interval distribution.
  • the central angle corresponding to the measurement groove 142 near the outer periphery of the measurement end face 141 and the central angle corresponding to the measurement groove 142 near the inner periphery of the measurement end face 141 may be the same or different, as long as the degree of wear can be measured online.
  • thirty-eight measurement grooves 142 are provided on the measurement end surface 141 ; six measurement grooves 142 are distributed along the inner circumference of the static ring 14 at intervals, and thirty-two measurement grooves 142 are arranged along the static ring 14 The outer periphery is spaced apart.
  • B is the maximum central angle corresponding to the measurement groove 142
  • ⁇ is the wear amount that has occurred in the depth direction
  • ⁇ is the depth of the measurement groove 142 .
  • Six measurement grooves 142 are evenly distributed near the inner periphery of the measurement end face 141 . If the inner diameters of the moving ring 13 and the stationary ring 14 are in solid contact, the disengagement will be monitored 6 times in each cycle, and the signal duration of the disengagement is about the central angle occupied by the measurement groove 142 .
  • the cross section of the measuring groove 142 is triangular, and when the moving ring 13 and the static ring 14 are gradually worn, the central angle of the measuring groove 142 will gradually decrease.
  • measuring grooves 142 are arranged near the outer periphery of the measuring end face 141. If the outer diameter of the moving ring 13 and the stationary ring 14 are in solid contact, 32 disengagements will be monitored in each cycle, and the same as the aforementioned inner diameter. A similar principle in the case reflects the amount of wear. Based on the above technology, the online monitoring of the seal wear amount can be realized.
  • the measuring groove 142 is changed to be wider away from the end face, so as to minimize the influence of the wear monitoring groove on the gas film characteristics when the wear has not yet occurred or the wear amount is small.
  • the measurement groove 142 is set at the position ⁇ below the measurement end face 141 , and - ⁇ indicates that the disengagement between the movable ring 13 and the stationary ring 14 occurs only after the thickness of ⁇ is worn.
  • other numbers of measurement grooves 142 may also be provided at the inner peripheral edge and the outer peripheral edge of the stationary ring 14, respectively.
  • the movable ring 13 has a sealing end surface 132 facing the static ring 14 , and the sealing end surface 132 is provided with a plurality of T-shaped grooves 131 or arc-shaped grooves, and the plurality of T-shaped grooves 131 or The arc-shaped grooves are evenly spaced along the rotation direction of the moving ring 13 .
  • 18 T-shaped grooves 131 or arc-shaped grooves are evenly formed on the sealing end surface 132 of the moving ring 13 .
  • the mechanical seal device 10 capable of monitoring the wear amount further includes a base body, a rotating shaft, a moving ring 13 , a static ring seat 18 , a static ring 14 and a monitor 19 .
  • the base acts as a base support.
  • the rotating shaft is rotatably arranged on the base body, the moving ring 13 is sleeved on the rotating shaft, and the moving ring 13 rotates synchronously with the rotating shaft.
  • the static ring seat 18 is fixedly arranged on the base body, the static ring 14 is arranged on the static ring seat 18, the static ring 14 is arranged adjacent to the moving ring 13, the static ring 14 has a measuring end face 141 facing the moving ring 13, and the measuring end face 141 is provided with a measuring groove 142 , the opening position of the measuring groove 142 is close to the peripheral edge of the static ring 14 , and the central angles corresponding to the revolving section of the measuring groove 142 are not identical at different depths.
  • the monitor 19 is arranged on the static ring 14 , and the monitor 19 is used to monitor the acoustic emission signal generated by the friction pair formed by the static ring 14 and the moving ring 13 .
  • the mechanical seal device 1010 capable of monitoring the wear amount further includes a push ring 15 and a spring 16 , the static ring 14 , the push ring 15 , the spring 16 and the static ring seat 18 are arranged in sequence along the axial direction of the rotating shaft, and the static ring seat 18 passes through the spring 16 And the push ring 15 supports the static ring 14 floatingly.
  • the above-mentioned mechanical sealing device 1010 that can monitor the amount of wear, the two opposite surfaces between the moving ring 13 and the static ring 14 form a friction pair, and a layer is formed and maintained between the rotating moving ring 13 and the stationary static ring 14. Only a few layers. Micron-thick gas or liquid film to prevent leakage or direct contact between the moving ring 13 and the static ring 14 .
  • the monitor 19 can monitor the generated sound wave signals or stress wave signals.
  • the measurement grooves 142 opened on the measurement end surface 141 of the static ring 14 are distributed on the periphery of the static ring 14.
  • the monitor 19 can monitor the difference between the two kinds of sound waves or stress waves, thereby judging whether contact friction occurs between the moving ring 13 and the static ring 14 .
  • the wear degree of the measuring groove 142 along its own depth direction is different, and then the moving ring 13 rubs the friction passing through the measuring groove 142.
  • the time period also changes accordingly.
  • the real-time wear condition between the moving ring 13 and the static ring 14 can be accurately known by counting the time period during which the friction of the moving ring 13 passes through the measuring groove 142 , so as to realize the online monitoring of the wear amount of the mechanical seal device.
  • the friction pair between the hard material moving ring 13 and the soft material static ring 14 functions as a rotary seal.
  • the moving ring 13 is fixedly connected with the rotating shaft via the shaft sleeve 11 and the sleeve 12, and rotates therewith.
  • the static ring 14 is floatingly supported on the static ring seat 18 via the push ring 15, the spring 16 and the auxiliary seal 17 (wherein the auxiliary seal 17 forms a secondary potential leakage channel, which is usually not the primary consideration), so the static ring 14 is not Rotation (the anti-rotation part is not shown in the figure) but has floating property, it is designed to maintain a relatively stable relative motion relationship between its measuring end face 141 and the sealing end face 132 of the moving ring 13 under the action of various forces, To prevent the distance between the two is too large (thereby causing excessive leakage) or too small (so that contact and rapid damage).

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Mechanical Sealing (AREA)

Abstract

La présente invention concerne un dispositif de scellement étanche mécanique (10) capable de surveiller la quantité d'usure, comprenant une bague mobile (13), une bague fixe (14) et un dispositif de surveillance (19), la bague mobile pouvant être emmanchée sur un arbre rotatif, l'arbre rotatif tournant de manière synchrone avec l'arbre rotatif, la bague fixe étant agencée de manière adjacente à la bague mobile, et la bague fixe ou la bague mobile comportant une surface d'extrémité de mesure (141). La surface d'extrémité de mesure comporte une rainure de mesure (142), la position ouverte de la rainure de mesure est proche du bord périphérique de la bague fixe ou de la bague mobile, l'angle central correspondant à la section transversale rotative de la rainure de mesure n'est pas complètement le même à différentes profondeurs, et un dispositif de surveillance est agencé sur la bague fixe ou la bague mobile et est utilisé pour surveiller des signaux d'émission acoustique générés par une paire de frottement formée par la bague fixe et la bague mobile. Selon le dispositif de scellement étanche mécanique capable de surveiller la quantité d'usure, lorsque la bague mobile ou la bague fixe produit une onde acoustique ou une onde de contrainte correspondante en raison du frottement provoqué par l'inclinaison, le dispositif de surveillance surveille le signal d'onde acoustique ou le signal d'onde de contrainte généré, et les conditions d'usure en temps réel entre la bague mobile et la bague fixe peuvent être connues avec précision au moyen du comptage des périodes de temps pendant lesquelles un frottement se produit lorsque la bague mobile passe à travers la rainure de mesure, de telle sorte que la quantité d'usure est surveillée en ligne.
PCT/CN2021/135929 2020-12-30 2021-12-07 Dispositif de scellement étanche mécanique capable de surveiller la quantité d'usure WO2022143029A1 (fr)

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CN202011629974.8A CN112664654B (zh) 2020-12-30 2020-12-30 可监测磨损量的机械密封装置
CN202011629974.8 2020-12-30

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CN117619503A (zh) * 2024-01-25 2024-03-01 北京蓝爱迪电力技术有限公司 一种磨煤机的动静环调节机构

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CN112664654B (zh) * 2020-12-30 2024-09-10 清华大学 可监测磨损量的机械密封装置

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DE102013003159A1 (de) * 2013-02-26 2014-08-28 Carl Freudenberg Kg Gleitringdichtung mit Encoderfunktion
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Publication number Priority date Publication date Assignee Title
CN117619503A (zh) * 2024-01-25 2024-03-01 北京蓝爱迪电力技术有限公司 一种磨煤机的动静环调节机构
CN117619503B (zh) * 2024-01-25 2024-04-30 北京蓝爱迪电力技术有限公司 一种磨煤机的动静环调节机构

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