CN112664654A

CN112664654A - Mechanical sealing device capable of monitoring abrasion loss

Info

Publication number: CN112664654A
Application number: CN202011629974.8A
Authority: CN
Inventors: 黄伟峰; 尹源; 刘向锋; 刘莹; 李德才; 王玉明
Original assignee: Tsinghua University
Current assignee: Tsinghua University
Priority date: 2020-12-30
Filing date: 2020-12-30
Publication date: 2021-04-16
Also published as: WO2022143029A1

Abstract

The invention relates to a mechanical sealing device capable of monitoring abrasion loss, which comprises a movable ring, a fixed ring and a monitor. The rotating shaft can be sleeved with the movable ring, and the movable ring synchronously rotates along with the rotating shaft. The static ring and the rotating ring are arranged adjacently, a measuring end face is arranged on the static ring or the rotating ring, a measuring groove is formed in the measuring end face, the forming position of the measuring groove is close to the periphery of the static ring or the rotating ring, and the central angles corresponding to the rotating cross sections of the measuring groove are not identical at different depths. The monitor is arranged on the static ring or the dynamic ring and is used for monitoring acoustic emission signals generated by a friction pair formed by the static ring and the dynamic ring. According to the mechanical sealing device capable of monitoring the abrasion loss, when the movable ring or the static ring rubs due to inclination, corresponding sound waves or stress waves are generated, and a monitor monitors the generated sound wave signals or stress wave signals. The real-time abrasion condition between the movable ring and the static ring can be accurately known by counting the time period of the friction of the movable ring passing through the measuring groove, so that the online monitoring of the abrasion loss is realized.

Description

Mechanical sealing device capable of monitoring abrasion loss

Technical Field

The invention relates to the technical field of mechanical sealing, in particular to a mechanical sealing device capable of monitoring abrasion loss.

Background

One of application scenarios of the mechanical seal is shaft end seal for rotating mechanical equipment, which can realize sealing effect under higher parameters and is widely applied in the fields of petrochemical industry, nuclear energy, aerospace and the like. The good operation of the mechanical sealing device is the key to ensure the sealing performance. The wear of the mechanical seal during operation can result in impaired performance. Although mechanical seals are generally designed to be less susceptible to wear, mechanical seal wear may deviate from the expected state due to design calculation errors, manufacturing and assembly errors, operating condition variations, external impacts, and other difficult to control factors. Under the current technical conditions, the wear cannot be monitored in the working process of the mechanical seal, and the important reason is that the wear in the current mechanical seal structure does not generate physical elements for the existing online monitoring and capturing.

Disclosure of Invention

In view of the above, it is necessary to provide a mechanical seal device capable of monitoring an amount of wear on line, in order to solve the problem that the conventional mechanical seal device cannot monitor the amount of wear on line.

A mechanical seal assembly capable of monitoring wear, comprising:

the rotating shaft can be sleeved with the rotating ring, and the rotating ring synchronously rotates along with the rotating shaft;

the static ring is arranged adjacent to the moving ring, the static ring is provided with a measuring end face facing the moving ring, or the moving ring is provided with a measuring end face facing the static ring, the measuring end face is provided with a measuring groove, the forming position of the measuring groove is close to the periphery of the static ring or the moving ring, and the central angles corresponding to the rotary sections of the measuring groove are not completely the same at different depths;

the monitor is arranged on the static ring or the dynamic ring and used for monitoring acoustic emission signals generated by a friction pair formed by the static ring and the dynamic ring.

In one embodiment, the central angle corresponding to the revolution section of the measuring groove is gradually changed along with the change of the depth; the central angle corresponding to the revolution section of the measuring groove is gradually increased or decreased along with the change of the depth.

In one embodiment, the cross section of the measuring groove along the depth direction of the measuring groove is triangular, trapezoidal, at least partially circular arc and/or zigzag.

In one embodiment, the measuring end face is provided with at least two measuring grooves, and the at least two measuring grooves are distributed at intervals along the periphery of the stationary ring.

In one embodiment, at least two of the measuring grooves are spaced apart along an outer circumference of the stationary ring or the moving ring, and/or at least two of the measuring grooves are spaced apart along an inner circumference of the stationary ring or the moving ring.

In one embodiment, thirty-eight measuring grooves are formed in the measuring end surface; six the measurement recess is followed the internal periphery interval distribution of quiet ring, thirty two the measurement recess is followed the outer periphery interval distribution of quiet ring.

In one embodiment, at least two of the measuring grooves are equally spaced along the circumference of the stationary ring.

In one embodiment, the static ring is provided with a measuring end surface facing the dynamic ring, and the measuring groove is opened close to the periphery of the static ring; the monitor is arranged on the static ring.

In one embodiment, the rotating ring has a sealing end surface facing the stationary ring, the sealing end surface is provided with a plurality of T-shaped grooves or arc-shaped grooves, and the T-shaped grooves or the arc-shaped grooves are uniformly distributed at intervals along the rotation direction of the rotating ring.

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

a substrate;

the rotating shaft is rotatably arranged on the base body, the movable ring is sleeved on the rotating shaft, and the movable ring synchronously rotates along 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 sealing device capable of monitoring the wear amount further comprises a push ring and a spring, the stationary ring, the push ring, the spring and the stationary ring seat are sequentially arranged along the axial direction of the rotating shaft, and the stationary ring seat supports the stationary ring through the spring and the push ring in a floating manner.

In the mechanical sealing device capable of monitoring the abrasion loss, two opposite surfaces between the rotating ring and the static ring form a friction pair, and an air film or a liquid film with the thickness of only a few micrometers is formed and maintained between the rotating ring and the static ring so as to prevent leakage or prevent direct contact between the rotating ring and the static ring. When the movable ring or the static ring rubs due to inclination, corresponding sound waves or stress waves are generated, and the monitor can monitor the generated sound wave signals or stress wave signals. Meanwhile, the measuring grooves formed in 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, and when the moving ring rubs with the surface of the measuring end face between the static ring and the moving ring and rubs with the measuring grooves, the emitted sound waves or stress waves are different, and the monitor can monitor the difference of the two sound waves or stress waves and further judge whether contact friction occurs between the moving ring and the static ring. Further, when the movable ring and the stationary ring are in different friction stages (such as a slight friction stage or a severe friction stage), the degree of wear of the measuring groove in the depth direction is different, and further, the time period of the friction of the movable ring passing through the measuring groove is correspondingly changed. The real-time abrasion condition between the movable ring and the static ring can be accurately known by counting the time period of the friction of the movable ring passing through the measuring groove, and the online monitoring of the abrasion loss of the mechanical sealing device is realized.

Drawings

Fig. 1 is a schematic structural diagram of a mechanical sealing device capable of monitoring wear according to an embodiment of the present invention;

fig. 2 is a schematic view of a stationary ring structure according to an embodiment of the present invention;

FIG. 3 is a schematic view of a wear structure of a stationary ring according to an embodiment of the present invention;

FIG. 4 is a schematic diagram of a wear structure of a stationary ring according to another embodiment of the present invention;

fig. 5 is a schematic view of a movable ring structure according to an embodiment of the present invention.

Wherein: 10. a mechanical sealing device capable of monitoring the abrasion loss; 11. a shaft sleeve; 12. a sleeve; 13. a moving ring; 131. a T-shaped slot; 132. sealing the end face; 14. a stationary ring; 141. measuring the end face; 142. measuring the groove; 15. a push ring; 16. a spring; 17. secondary sealing; 18. a stationary ring seat; 19. a monitor.

Detailed Description

In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in detail below. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention. This invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein.

In the description of the present invention, it is to be understood that the terms "central," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," "circumferential," and the like are used in the orientations and positional relationships indicated in the drawings for convenience in describing the invention and to simplify the description, and are not intended to indicate or imply that the referenced device or element must have a particular orientation, be constructed and operated in a particular orientation, and are not to be considered limiting of the invention.

Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of the present invention, "a plurality" means at least two, e.g., two, three, etc., unless specifically limited otherwise.

In the present invention, unless otherwise expressly stated or limited, the terms "mounted," "connected," "secured," and the like are to be construed broadly and can, for example, be fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; they may be directly connected or indirectly connected through intervening media, or they may be connected internally or in any other suitable relationship, unless expressly stated otherwise. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.

In the present invention, unless otherwise expressly stated or limited, the first feature "on" or "under" the second feature may be directly contacting the first and second features or indirectly contacting the first and second features through an intermediate. Also, a first feature "on," "over," and "above" a second feature may be directly or diagonally above the second feature, or may simply indicate that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature may be directly under or obliquely under the first feature, or may simply mean that the first feature is at a lesser elevation than the second feature.

It will be understood that when an element is referred to as being "secured to" or "disposed on" another element, it can be directly on the other element or intervening elements 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 the like as used herein are for illustrative purposes only and do not denote a unique embodiment.

The mechanical seal is a shaft seal device, which is a device for preventing fluid leakage, which is formed by at least a pair of end faces perpendicular to a rotation axis, which are kept in contact and relatively slide under the action of fluid pressure and the elastic force of a compensating mechanism and the cooperation of an auxiliary seal, and is generally used as a seal for the end of a rotation shaft of a rotary mechanical device. The mechanical seal can adopt liquid or gas as a sealing medium, wherein the spiral groove dry gas seal has excellent comprehensive performance and is particularly widely applied. The mechanical seal is inevitably worn to different degrees in the use process, and online wear monitoring on the mechanical seal device is an effective means for ensuring the sealing performance of the mechanical seal device. The invention provides a mechanical sealing device capable of realizing online monitoring of abrasion loss. It is understood that the solution of online monitoring of the wear amount, which is illustrated in the following embodiments, may also be applied to other seals besides dry gas seals through appropriate modification.

As shown in fig. 1 to 3, an embodiment of the present invention provides a mechanical seal device 10 capable of monitoring wear amount, which includes a moving ring 13, a stationary ring 14 and a monitor 19. Wherein, the rotating shaft can be located to the rotating ring 13 cover to the rotating ring 13 carries out synchronous rotation along with the rotating shaft. The static ring 14 is arranged adjacent to the dynamic ring 13, the static ring 14 has a measuring end surface 141 facing the dynamic ring 13, and when the dynamic ring 13 rotates, a fluid (gas or liquid) with certain pressure can be formed between the static measuring end surface 141 and the dynamic ring 13, so that leakage prevention of a lubricating medium is realized. Furthermore, the measuring end face 141 is provided with a measuring groove 142, the opening position of the measuring groove 142 is close to the periphery of the stationary ring 14, and the central angles corresponding to the revolving cross sections of the measuring groove 142 are not completely the same at different depths. The monitor 19 is arranged on the static ring 14, and the monitor 19 is used for monitoring an acoustic emission signal generated by a friction pair formed by the static ring 14 and the dynamic ring 13. The rotation cross section of the measurement groove 142 is a plane defined by the edge of the measurement groove 142 after the stationary ring 14 is cut, with a plane in the rotation (circumferential) direction of the stationary ring 14, that is, a plane passing through the diameter of the stationary ring 14 as a cross section.

In the mechanical sealing device 10 capable of monitoring the abrasion loss, two opposite surfaces between the movable ring 13 and the static ring 14 form a friction pair, and an air film or a liquid film with the thickness of only a few micrometers is formed and maintained between the rotating movable ring 13 and the static ring 14 to prevent leakage or prevent direct contact between the movable ring 13 and the static ring 14. When the movable ring 13 or the stationary ring 14 rubs due to inclination, a corresponding acoustic wave or stress wave is generated, and the monitor 19 can monitor the generated acoustic wave signal or stress wave signal. Meanwhile, the measuring grooves 142 formed in the measuring end face 141 of the stationary ring 14 are distributed on the periphery of the stationary ring 14, and when the movable ring 13 rubs against the surface of the measuring end face 141 of the stationary ring 14 and rubs against the measuring grooves 142, the sound waves or stress waves emitted are different, and the monitor 19 can monitor the difference between the two sound waves or stress waves, so as to judge whether contact friction occurs between the movable ring 13 and the stationary ring 14. Further, when the moving ring 13 and the stationary ring 14 are in different friction stages (for example, a slight friction stage or a severe friction stage), the degree of wear of the measuring groove 142 in the depth direction thereof is different, and further, the time period during which the moving ring 13 rubs through the measuring groove 142 is correspondingly changed. The real-time abrasion condition between the movable ring 13 and the static ring 14 can be accurately known by counting the time period of the friction of the movable ring 13 passing through the measuring groove 142, so that the online monitoring of the abrasion loss of the mechanical sealing device is realized.

It should be noted that Acoustic Emission (AE) refers to an elastic wave (i.e., a stress wave) generated by a material under a force, in which local energy is rapidly released. Acoustic emission is sometimes also referred to as "stress wave emission". The possible acoustic emission sources of engineering are mainly: cracks develop and propagate, contact friction, impact, wear, plastic deformation, corrosion, fluid leakage, phase change, and the like. The acoustic emission signal may be monitored by an acoustic emission sensor. Traditionally, acoustic emission technology is a non-destructive online monitoring technique for structural integrity. When micro-cracks or micro-crack propagation occurs inside the material (in general, macroscopic material damage is caused by the initiation and development of micro-cracks), energy is released in the form of elastic waves (i.e., stress waves), i.e., acoustic emission signals are generated. This allows the risk of structural failure to be predicted.

As acoustic emission technology has evolved, many other acoustic emission sources have also received attention. In the last 70 th century, attempts were made to use acoustic emission technology for the monitoring of mechanical seals. At this point, the generation and propagation of microcracks is no longer of concern and the monitoring personnel are interested primarily in both contact friction and fluid leakage acoustic emission sources. Under the current technical conditions, acoustic emission signals (frictional acoustic emissions) generated by contact friction of the seal end face 132 are not only easily measured, but also easily separated from various background noises (thus being suitable for use in relatively complicated environments such as industrial sites).

In the above embodiment, the measuring end face 141 is provided on the stationary ring 14, while the monitor 19 is also provided on the stationary ring 14. However, in other embodiments, the measuring end surface 141 is not necessarily on the stationary ring 14, and may be disposed on the relatively soft moving ring 13 when the moving ring 13 is softer relative to the stationary ring 14. The wear amount is actually monitored only by considering the soft ring of the moving ring 13 and the stationary ring 14 (in the hard-soft pairing, the hard ring is hardly worn), so that the measurement groove 142 in which the center angles corresponding to the turning sections are not completely the same at different depths is effective only on the soft ring. The ring in which the measuring grooves 142 are located and the ring in which the sensor is mounted do not have to be the same, as long as the acoustic emission signals emitted when the moving ring 13 and the stationary ring 14 are in contact can be monitored. The following embodiments are explained by taking the example of "the measuring end face 141 is on the stationary ring 14 while the monitor 19 is provided on the stationary ring 14". It should be understood that, with reasonable modifications, a technical solution of "measuring the end face 141 on the moving ring 13 or the stationary ring 14, and the monitor 19 on the moving ring 13 or the stationary ring 14" can be designed.

The central angles corresponding to the revolving cross sections of the measuring grooves 142 are not completely the same at different depths, so that acoustic emission signals monitored by the monitor 19 in a rotation period of the rotating ring 13 are also different when different degrees of wear occur, and finally the current wear degree of the mechanical sealing device can be effectively judged. It can be understood that, in the above-mentioned technical solution for measuring the wear degree on line, the wear degree range of the mechanical sealing device may be estimated roughly (for example, the central angle corresponding to the revolving section of the measuring groove 142 changes step-wise with the depth), or the wear degree may be measured accurately (for example, the central angle corresponding to the revolving section of the measuring groove 142 changes gradually with the depth). As shown in fig. 1 to 3, in an embodiment of the present invention, the central angle corresponding to the rotation section of the measurement groove 142 gradually increases or decreases with the change of the depth, and further, the central angle corresponding to the rotation section of the measurement groove 142 and the depth thereof are in a monotonic correspondence relationship. If the acoustic emission signal between the stationary ring 14 and the moving ring 13 in a relative movement period is captured by the monitor 19, the wear degree of the mechanical seal device can be accurately judged by the monotonic correspondence relationship.

Optionally, the cross section of the measuring groove 142 along the depth direction thereof is triangular, trapezoidal, at least partially circular arc and/or zigzag. Wherein, the triangle, the trapezoid, at least part of the circular arc and/or the broken line can be designed positively and negatively according to the requirement. As shown in fig. 1-3, taking the triangular measuring groove 142 as an example for illustration, when one of three sides of the triangle is directed to the surface of the measuring end surface 141, when the moving ring 13 rubs against the stationary ring 14 due to inclination, etc., the moving ring 13 may briefly get out of contact (due to the groove here) when the friction passes over the measuring groove 142, and the central angle corresponding to the time length of the out-of-contact is calculated. In the initial stage of wear, the central angle corresponding to the contact-breaking time is large, and as the degree of wear increases, the central angle corresponding to the contact-breaking time gradually decreases. As shown in fig. 4, when one vertex angle of the triangular measuring groove 142 is designed to face the measuring end surface 141, similarly, at the initial stage of wear, the central angle corresponding to the time period of the disengagement is smaller, and as the degree of wear becomes greater, the central angle corresponding to the time period of the disengagement gradually increases. When one vertex angle of the triangular measurement groove 142 is designed to face the measurement end face 141, the influence of the measurement groove 142 on the air film characteristics between the moving ring 13 and the stationary ring 14 when abrasion does not occur or the abrasion loss is small can be reduced as much as possible.

In an embodiment of the present invention, as shown in fig. 1-3, the measuring end surface 141 is provided with at least two measuring grooves 142, and the at least two measuring grooves 142 are spaced apart along the circumference of the stationary ring 14. The two or more measuring grooves 142 can significantly improve the accuracy of monitoring the wear of the mechanical device. If the movable ring 13 and the stationary ring 14 are in frictional contact, the movable ring and the stationary ring are separated from contact twice or for multiple times in one relative movement period, the central angle corresponding to the contact separation duration of each time is respectively calculated, the average value of the central angles is continuously calculated, and the monitoring accuracy of the abrasion degree of the mechanical device can be effectively improved. Further, at least two measurement grooves 142 are distributed along the periphery of the stationary ring 14 at equal intervals, so that the processing and manufacturing are facilitated, the contact separation duration can be monitored more uniformly, and the accuracy of monitoring data is improved.

It is understood that when the movable ring 13 and the stationary ring 14 are parallel planes, the outer periphery of the movable ring 13 and the outer periphery of the stationary ring 14 are in frictional contact due to the inclination of the movable ring 13 and/or the stationary ring 14. When the movable ring 13 and the stationary ring 14 are non-planar with taper (along the axial direction of the rotating shaft), the taper is one of important factors influencing the working state of the movable ring. It is necessary to note that, in the field of mechanical sealing, the error in the planarity of the 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 conicity. The taper will affect whether the frictional contact is at the inner or outer diameter. As shown in fig. 1-3, in one embodiment of the present invention, at least two measurement grooves 142 are spaced apart along an outer periphery of stationary ring 14, and/or at least two measurement grooves 142 are spaced apart along an inner periphery of stationary ring 14. The central angle corresponding to the measurement groove 142 near the outer periphery of the measurement end surface 141 may be the same as or different from the central angle corresponding to the measurement groove 142 near the inner periphery of the measurement end surface 141, as long as the wear degree can be measured on line. In a specific embodiment, thirty-eight measuring grooves 142 are formed in the measuring end surface 141; six measurement grooves 142 are spaced along the inner periphery of stationary ring 14, and thirty-two measurement grooves 142 are spaced along the outer periphery of stationary ring 14.

In the above embodiment, as shown in fig. 1 to 3, B is the maximum central angle corresponding to the measurement groove 142, γ is the amount of wear in the depth direction that has occurred, and δ is the depth of the measurement groove 142. The measuring end face 141 is uniformly provided with 6 measuring grooves 142 near the inner circumference. If solid contact occurs between the inner diameters of the moving ring 13 and the stationary ring 14, 6 times of contact-off is detected in each cycle, and the signal duration of the contact-off is about the central angle occupied by the measuring groove 142. The measuring groove 142 has a triangular cross-section, and the central angle of the measuring groove 142 gradually decreases as the moving ring 13 and the stationary ring 14 gradually wear. The 32 measuring grooves 142 are provided near the outer periphery of the measuring end surface 141, and if solid contact occurs between the outer diameters of the moving ring 13 and the stationary ring 14, 32 times of contact disengagement is detected in each cycle, and the wear amount is reflected on the similar principle to the aforementioned inner diameter case. Based on the technology, the online monitoring of the seal abrasion loss can be realized. Alternatively, as shown in FIG. 4, the measurement groove 142 is modified to be wider away from the end face to minimize the effect of the wear monitoring groove on the gas film characteristics when no or small amounts of wear have occurred. Further, the measuring groove 142 is opened at a position γ below the measuring end face 141, and γ represents a wear γ thickness before the moving ring 13 and the stationary ring 14 are disengaged from each other. In other embodiments, other numbers of measuring grooves 142 may be provided at the inner and outer peripheries 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 stationary ring 14, 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 arc-shaped grooves are uniformly distributed at intervals along a rotation direction of the movable ring 13. For example, 18T-shaped grooves 131 or arc-shaped grooves are uniformly formed in the sealing end surface 132 of the rotating ring 13.

As shown in fig. 1-3, in an embodiment of the present invention, the mechanical seal device 10 capable of monitoring the amount of wear further includes a base, a rotating shaft, a moving ring 13, a stationary ring seat 18, a stationary ring 14, and a monitor 19. The base body plays a role of a foundation support. The rotating shaft is rotatably arranged on the base body, the rotating shaft is sleeved with the movable ring 13, and the movable ring 13 synchronously rotates along with the rotating shaft. Stationary ring seat 18 is fixed to be set up in the base member, and stationary ring 14 sets up in stationary ring seat 18, and stationary ring 14 and rotating ring 13 are adjacent to be set up, and stationary ring 14 has the measurement terminal surface 141 towards rotating ring 13, and measurement recess 142 is seted up to measurement terminal surface 141, and the position of seting up of measuring recess 142 is close to the periphery of stationary ring 14, and the central angle that the gyration cross-section of measuring recess 142 corresponds is not identical in different degree of depth departments. The monitor 19 is arranged on the static ring 14, and the monitor 19 is used for monitoring an acoustic emission signal generated by a friction pair formed by the static ring 14 and the dynamic ring 13. Further, the mechanical sealing device 1010 capable of monitoring the wear amount further comprises a push ring 15 and a spring 16, the stationary ring 14, the push ring 15, the spring 16 and the stationary ring seat 18 are sequentially arranged along the axial direction of the rotating shaft, and the stationary ring seat 18 supports the stationary ring 14 in a floating manner through the spring 16 and the push ring 15.

In the mechanical seal 1010 capable of monitoring the amount of wear, a friction pair is formed between two opposite surfaces of the rotating ring 13 and the stationary ring 14, and an air film or a liquid film with a thickness of only a few micrometers is formed and maintained between the rotating ring 13 and the stationary ring 14 to prevent leakage or prevent direct contact between the rotating ring 13 and the stationary ring 14. When the movable ring 13 or the stationary ring 14 rubs due to inclination, a corresponding acoustic wave or stress wave is generated, and the monitor 19 can monitor the generated acoustic wave signal or stress wave signal. Meanwhile, the measuring grooves 142 formed in the measuring end face 141 of the stationary ring 14 are distributed on the periphery of the stationary ring 14, and when the movable ring 13 rubs against the surface of the measuring end face 141 of the stationary ring 14 and rubs against the measuring grooves 142, the sound waves or stress waves emitted are different, and the monitor 19 can monitor the difference between the two sound waves or stress waves, so as to judge whether contact friction occurs between the movable ring 13 and the stationary ring 14. Further, when the moving ring 13 and the stationary ring 14 are in different friction stages (for example, a slight friction stage or a severe friction stage), the degree of wear of the measuring groove 142 in the depth direction thereof is different, and further, the time period during which the moving ring 13 rubs through the measuring groove 142 is correspondingly changed. The real-time abrasion condition between the movable ring 13 and the static ring 14 can be accurately known by counting the time period of the friction of the movable ring 13 passing through the measuring groove 142, so that the online monitoring of the abrasion loss of the mechanical sealing device is realized.

In one embodiment of the present invention, the friction pair between the hard moving ring 13 and the soft stationary ring 14 functions as a rotary seal. The rotating ring 13 is fixedly connected with the rotating shaft through a shaft sleeve 11 and a sleeve 12 and rotates along with the rotating shaft. The stationary ring 14 is floatingly supported on the stationary ring seat 18 via the thrust ring 15, the spring 16 and the secondary seal 17 (wherein the secondary seal 17 forms a secondary potential leakage path and is generally not a primary consideration), so that the stationary ring 14 does not rotate (the anti-rotation member is not shown in the drawings) but has floatability designed to maintain its measuring end face 141 in a relatively stable relative movement relationship with the sealing end face 132 of the moving ring 13 under various forces to prevent them from being too far apart (resulting in excessive leakage) or too small (resulting in contact and rapid damage).

The friction pair between the rotating ring 13 and the stationary ring 14, as described above, functions as a rotary seal. It is designed to have certain rigidity (i.e. as the relative positions of the moving ring 13 and the stationary ring 14 change, the acting force provided by the friction pair on the stationary ring 14 can change to resist the change), so as to maintain a relatively stable relative motion relationship between the measuring end face 141 of the stationary ring 14 and the sealing end face 132 of the moving ring 13. The rotating ring 13 is formed with 18T-shaped slots 131 to provide such rigidity.

The technical features of the embodiments described above may be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the embodiments described above are not described, but should be considered as being within the scope of the present specification as long as there is no contradiction between the combinations of the technical features.

The above-mentioned embodiments only express several embodiments of the present invention, and the description thereof is more specific and detailed, but not construed as limiting the scope of the invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the inventive concept, which falls within the scope of the present invention. Therefore, the protection scope of the present patent shall be subject to the appended claims.

Claims

1. A mechanical seal assembly capable of monitoring wear, comprising:

2. The mechanical seal device capable of monitoring the abrasion loss according to claim 1, wherein the central angle corresponding to the revolution section of the measuring groove is gradually changed along with the change of the depth; the central angle corresponding to the revolution section of the measuring groove is gradually increased or decreased along with the change of the depth.

3. A mechanical seal device capable of monitoring wear according to claim 2 wherein the cross-section of the measuring groove along its depth direction is triangular, trapezoidal, at least partially circular and/or polygonal.

4. A mechanical seal arrangement according to any of claims 1 to 3 wherein said measuring end face is provided with at least two said measuring grooves spaced along the periphery of said stationary ring.

5. A wear monitorable mechanical seal according to claim 4 and wherein at least two of said measurement grooves are spaced along the outer periphery of said static or dynamic ring and/or at least two of said measurement grooves are spaced along the inner periphery of said static or dynamic ring.

6. The mechanical seal device capable of monitoring the abrasion loss according to claim 5, wherein thirty-eight measuring grooves are formed in the measuring end face; six the measurement recess is followed the internal periphery interval distribution of quiet ring, thirty two the measurement recess is followed the outer periphery interval distribution of quiet ring.

7. A mechanical seal arrangement according to claim 4 wherein at least two of said measurement grooves are equally spaced around the periphery of said stationary ring.

8. A mechanical seal device capable of monitoring wear according to any one of claims 1-3, wherein said stationary ring has a measuring end surface facing said moving ring, and said measuring groove is formed near the periphery of said stationary ring; the monitor is arranged on the static ring.

9. The mechanical seal device capable of monitoring the abrasion according to claim 8, wherein the rotating ring has a sealing end surface facing the stationary ring, and the sealing end surface is provided with a plurality of T-shaped grooves or arc-shaped grooves, and the T-shaped grooves or the arc-shaped grooves are uniformly distributed at intervals along the rotation direction of the rotating ring.

10. A mechanical seal device capable of monitoring wear according to any one of claims 1-3, further comprising:

a substrate;

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

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