WO2022143029A1

WO2022143029A1 - Mechanical sealing device capable of monitoring amount of wear

Info

Publication number: WO2022143029A1
Application number: PCT/CN2021/135929
Authority: WO
Inventors: 黄伟峰; 尹源; 刘向锋; 刘莹; 李德才; 王玉明
Original assignee: 清华大学
Priority date: 2020-12-30
Filing date: 2021-12-07
Publication date: 2022-07-07
Also published as: CN112664654A

Abstract

A mechanical sealing device (10) capable of monitoring the amount of wear, comprising a moving ring (13), a stationary ring (14) and a monitor (19), wherein the moving ring can be sleeved on a rotating shaft, the rotating shaft rotates synchronously along with the rotating shaft, the stationary ring is arranged adjacent to the moving ring, and the stationary ring or the stationary ring is provided with a measuring end surface (141). The measuring end surface is provided with a measuring groove (142), the position of the measuring groove is close to the peripheral edge of the stationary ring or the moving ring, the central angle corresponding to the rotating cross section of the measuring groove is not completely the same at different depths, and a monitor is arranged on the stationary ring or the moving ring and is used for monitoring acoustic emission signals generated by a friction pair formed by the stationary ring and the moving ring. According to the present mechanical sealing device capable of monitoring the amount of wear, when the moving ring or the stationary ring produces a corresponding acoustic wave or stress wave due to friction caused by tilt, the monitor monitors the generated acoustic wave signal or stress wave signal, and real-time wear conditions between the moving ring and the stationary ring can be accurately known by means of counting time periods in which friction occurs when the moving ring passes through the measuring groove, so that the amount of wear is monitored online.

Description

Mechanical seal to monitor wear

technical field

The invention relates to the technical field of mechanical seals, in particular to a mechanical seal device capable of monitoring the wear amount.

Background technique

One of the application scenarios of mechanical seals is shaft end seals for rotating mechanical equipment, which can achieve sealing under higher parameters and have been widely used in petrochemical, nuclear energy, aerospace and other fields. The good running state of the mechanical sealing device is the key to ensure its sealing performance. The wear of the mechanical seal during operation can cause its performance to be impaired. Although mechanical seals are usually designed to be less prone to wear, due to design calculation errors, manufacturing and assembly errors, changes in working conditions, external shocks and other difficult-to-control factors, the wear of mechanical seals may deviate from the expected state. Under the current technical conditions, it is impossible to monitor the wear during the working process of the mechanical seal. The important reason is that the wear itself does not produce physical elements that can be captured by the existing online monitoring in the current mechanical seal structure.

SUMMARY OF THE INVENTION

Based on this, it is necessary to provide a mechanical seal device capable of online monitoring of the wear amount in order to solve the problem that the current mechanical seal device cannot monitor the wear amount online.

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.

In one embodiment, 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.

In one of the embodiments, the cross section of the measuring groove along its own depth direction is triangular, trapezoidal, at least partially circular and/or folded.

In one embodiment, 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.

In one of the embodiments, 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.

In one embodiment, 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.

In one of the embodiments, at least two of the measurement grooves are distributed at equal intervals along the circumference of the stationary ring.

In one of the embodiments, 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.

In one embodiment, 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.

In one of the embodiments, the mechanical seal device capable of monitoring the wear amount further comprises:

matrix;

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.

In one embodiment, 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.

Description of drawings

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;

2 is a schematic structural diagram of a static ring according to an embodiment of the present invention;

3 is a schematic diagram of a static ring wear structure according to an embodiment of the present invention;

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.

Among them: 10. Mechanical sealing device that can monitor the amount of wear; 11. Shaft sleeve; 12. Sleeve; 13. Moving ring; 131. T-shaped groove; 132. Sealing end face; 14. Static ring; , measuring groove; 15, push ring; 16, spring; 17, auxiliary seal; 18, static ring seat; 19, monitor.

Detailed ways

In order to make the above objects, features and advantages of the present invention more clearly understood, the specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention. However, the present invention can be implemented in many other ways different from those described herein, and those skilled in the art can make similar improvements without departing from the connotation of the present invention. Therefore, the present invention is not limited by the specific embodiments disclosed below.

In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", " Back, Left, Right, Vertical, Horizontal, Top, Bottom, Inner, Outer, Clockwise, Counterclockwise, Axial , "radial", "circumferential" and other indicated orientations or positional relationships are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying the indicated device or Elements must have a particular orientation, be constructed and operate in a particular orientation and are therefore not to be construed as limitations of the invention.

In addition, the terms "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. In the description of the present invention, "plurality" means at least two, such as two, three, etc., unless otherwise expressly and specifically defined.

In the present invention, unless otherwise expressly specified and limited, 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. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific situations.

In the present invention, unless otherwise expressly specified and limited, 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. Also, 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.

It should be noted that when an element is referred to as being "fixed to" or "disposed on" another element, it can be directly on the other element or an intervening element may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. The terms "vertical", "horizontal", "upper", "lower", "left", "right" and similar expressions used herein are for the purpose of illustration only and do not represent the only embodiment.

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.

As shown in FIGS. 1-3 , 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. When the moving ring 13 rotates, 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. Further, 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 . It should be noted that 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 . When the movable ring 13 or the static ring 14 is rubbed due to inclination, corresponding sound waves or stress waves will be generated, and the monitor 19 can monitor the generated sound wave signals or stress wave signals. At the same time, 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. When the surface friction between the dynamic ring 13 and the measurement end surface 141 of the static ring 14 and the friction with the measurement groove 142, the The sound waves or stress waves are different, and 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 . Further, when the moving ring 13 and the stationary ring 14 are in different friction stages (such as a slight friction stage or a severe friction stage), 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.

It should be noted that Acoustic Emission (AE) 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. When 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.

With the development of acoustic emission technology, many other acoustic emission sources have also received attention. In the 1970s, some people began to try to use acoustic emission technology for the monitoring of mechanical seals. At this time, the generation and propagation of microcracks are no longer concerned, and the monitoring personnel are mainly interested in the two sources of acoustic emission, contact friction and fluid leakage. Under the current technical conditions, 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) .

In the above embodiment, the measuring end face 141 is set on the static ring 14 , and the monitor 19 is also set on the static ring 14 . However, in other embodiments, 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. It can be understood that, in the above-mentioned technical solution for measuring the degree of wear online, it is possible to roughly estimate the range of the degree of wear of the mechanical seal device (for example, the central angle corresponding to the revolving section of the measurement groove 142 changes in a step-like manner with the change of the depth), or it can be It is to accurately measure the degree of wear (for example, to measure the gradual change of the central angle corresponding to the revolving section of the groove 142 with the change of the depth). As shown in FIGS. 1-3 , in an embodiment of the present invention, 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. There is a monotonic correspondence between the central angle and its own depth. As long as the monitor 19 captures the acoustic emission signal between the stationary ring 14 and the moving ring 13 in a relative motion cycle, the degree of wear of the mechanical seal device can be accurately judged through the above monotonic correspondence.

Optionally, 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. Wherein, 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. 1-3, taking the triangular measurement groove 142 as an example, when one of the three sides of the triangle points to the surface of the measurement end face 141, when friction occurs between the movable ring 13 and the static ring 14 due to inclination, etc., When the moving ring 13 is rubbed across the measuring groove 142, there will be a brief disengagement (because it is a groove here), and the central angle corresponding to the time of disengagement is calculated. In the early stage of wear, the central angle corresponding to the length of out-of-contact is relatively large, and as the degree of wear increases, the central angle corresponding to the duration of out-of-contact decreases gradually. As shown in FIG. 4 , when one apex angle of the triangular measuring groove 142 is designed to face the measuring end face 141 , in the same way, in the initial stage of wear, the central angle corresponding to the length of the out-of-contact is small, and as the degree of wear increases, the out-of-contact The central angle corresponding to the duration gradually increases. In addition, when one apex angle of the triangular measuring groove 142 is designed to face the measuring end face 141 , the influence of the measuring groove 142 on the gas film characteristics between the moving ring 13 and the stationary ring 14 can be minimized as far as possible.

In an embodiment of the present invention, as shown in FIGS. 1-3 , 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. Further, 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.

It can be understood that when the movable ring 13 and the stationary ring 14 are parallel planes, when the movable ring 13 and/or the stationary ring 14 are inclined, friction will occur between the outer periphery of the movable ring 13 and the outer periphery of the stationary ring 14 touch. When the dynamic ring 13 and the stationary ring 14 are non-planar with a taper (in the axial direction of the rotating shaft), the taper is one of the important factors affecting its working state. It is necessary to explain that in the field of mechanical seals, the flatness error of the mutually facing end faces between the moving ring 13 and the stationary ring 14 is divided into two components: the circumferential direction is called waviness, and the radial direction is called taper. The taper will affect whether the point of frictional contact is located on the inner or outer diameter. As shown in FIGS. 1-3 , in an embodiment of the present invention, 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. In a specific embodiment, 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.

In the above embodiment, as shown in FIGS. 1-3 , B is the maximum central angle corresponding to the measurement groove 142 , γ is the wear amount that has occurred in the depth direction, and δ 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. 32 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. Optionally, as shown in FIG. 4 , 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. Further, the measurement groove 142 is set at the position γ below the measurement end face 141 , and -γ indicates that the disengagement between the movable ring 13 and the stationary ring 14 occurs only after the thickness of γ is worn. In other embodiments, 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.

As shown in FIG. 5 , in an embodiment of the present invention, 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 . For example, 18 T-shaped grooves 131 or arc-shaped grooves are evenly formed on the sealing end surface 132 of the moving ring 13 .

As shown in FIGS. 1-3 , in an embodiment of the present invention, 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 . Further, 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 . When the movable ring 13 or the static ring 14 is rubbed due to inclination, corresponding sound waves or stress waves will be generated, and the monitor 19 can monitor the generated sound wave signals or stress wave signals. At the same time, 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. When the surface friction between the dynamic ring 13 and the measurement end surface 141 of the static ring 14 and the friction with the measurement groove 142, the The sound waves or stress waves are different, and 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 . Further, when the moving ring 13 and the stationary ring 14 are in different friction stages (such as a slight friction stage or a severe friction stage), 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.

In an embodiment of the present invention, 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).

The friction pair between the moving ring 13 and the static ring 14, as mentioned above, acts as a rotary seal. It is designed to have a certain stiffness (that is, as the relative position of the moving ring 13 and the static ring 14 changes, the force provided by the friction pair on the static ring 14 will change against such changes), thereby maintaining the static ring 14 There is a relatively stable relative motion relationship between the measuring end face 141 of the moving ring 13 and the sealing end face 132 of the moving ring 13 . Eighteen T-shaped grooves 131 are formed on the moving ring 13 to provide such rigidity.

The technical features of the above-described embodiments can be combined arbitrarily. For the sake of brevity, all possible combinations of the technical features in the above-described embodiments are not described. However, as long as there is no contradiction between the combinations of these technical features, All should be regarded as the scope described in this specification.

The above-mentioned embodiments only represent several embodiments of the present invention, and the descriptions thereof are specific and detailed, but should not be construed as a limitation on the scope of the invention patent. It should be pointed out that for those of ordinary skill in the art, without departing from the concept of the present invention, several modifications and improvements can also be made, which all belong to the protection scope of the present invention. Therefore, the protection scope of the patent of the present invention should be subject to the appended claims.

Claims

A mechanical seal device capable of monitoring wear amount, characterized in that it includes:

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 mechanical seal device capable of monitoring the wear amount according to claim 1, wherein the central angle corresponding to the rotary section of the measuring groove changes gradually with the change of the depth; The central angle of , gradually increases or decreases with the change of depth.
The mechanical sealing device capable of monitoring the wear amount according to claim 2, wherein the cross section of the measuring groove along its own depth direction is triangular, trapezoidal, at least partially arcuate and/or folded.
The mechanical sealing device capable of monitoring the wear amount according to any one of claims 1-3, wherein at least two measurement grooves are provided on the measurement end surface, and at least two measurement grooves are formed along the The peripheral edge of the static ring is distributed at intervals.
The mechanical seal device capable of monitoring the wear amount according to claim 4, wherein at least two of the measuring grooves are distributed along the outer periphery of the stationary ring or the movable ring at intervals, and/or at least two The measuring grooves are distributed at intervals along the inner periphery of the stationary ring or the moving ring.
The mechanical sealing device capable of monitoring the wear amount according to claim 5, wherein thirty-eight measurement grooves are provided on the measurement end face; six measurement grooves are arranged along the inner surface of the static ring The circumference is spaced apart, and the thirty-two measurement grooves are spaced apart along the outer circumference of the stationary ring.
The mechanical seal device capable of monitoring the wear amount according to claim 4, wherein at least two of the measuring grooves are distributed at equal intervals along the circumference of the stationary ring.
The mechanical seal device capable of monitoring wear amount according to any one of claims 1-3, wherein the static ring has a measurement end face facing the moving ring, and the measurement groove is opened at a position close to the the periphery of the static ring; the monitor is arranged on the static ring.
The mechanical seal device capable of monitoring the wear amount according to claim 8, wherein the movable ring has a sealing end face facing the static ring, and a plurality of T-shaped grooves or arc-shaped grooves are provided on the sealing end face, A plurality of the T-shaped grooves or the arc-shaped grooves are evenly spaced along the rotation direction of the moving ring.
The mechanical seal device capable of monitoring the wear amount according to any one of claims 1-3, further comprising:

matrix;

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;

a static ring seat, which is fixedly arranged on the base body, and the static ring is arranged on the static ring seat;

A push ring and a spring, the static ring, the push ring, the spring and the static ring seat are arranged in sequence along the axial direction of the rotating shaft, and the static ring seat is floatingly supported by the spring and the push ring the static ring.