阅读说明：本技术 可主动控制润滑与密封性能的机械密封结构及其控制方法 (Mechanical sealing structure capable of actively controlling lubricating and sealing performances and control method thereof ) 是由 陈桑秋 戴庆文 陈磊 黄巍 王晓雷 于 2021-08-23 设计创作，主要内容包括：一种可主动控制润滑与密封性能的机械密封结构及其控制方法,在机械密封端面的静环外圈和静环内圈的上安装温控模块,通过温控模块精准调节内外圈温度,从而在密封端面形成所需的温度场,利用红外油膜测量仪实时监控温度场,由数据采集卡采集获得端面油膜厚度,通过油膜厚度反映端面润滑油的泄漏量,并根据泄漏量再次调节静环的内外圈温度将润滑油锚固在指定位置,直至润滑油的泄漏量达到规定范围,最终实现机械密封润滑和密封性能的协调控制,对润滑和密封性能要求较高的机械密封提供一种新的设计思路。(A temperature control module is arranged on a static ring outer ring and a static ring inner ring of a mechanical sealing end face, the temperature of the inner ring and the outer ring is accurately adjusted through the temperature control module, so that a required temperature field is formed on the sealing end face, the temperature field is monitored in real time by using an infrared oil film measuring instrument, the end face oil film thickness is acquired through a data acquisition card, the leakage amount of end face lubricating oil is reflected through the oil film thickness, the temperature of the inner ring and the outer ring of the static ring is adjusted again according to the leakage amount to anchor the lubricating oil at a specified position until the leakage amount of the lubricating oil reaches a specified range, finally, the coordination control of the lubrication and the sealing performance of the mechanical sealing is realized, and a new design idea is provided for the mechanical sealing with higher requirements on the lubrication and the sealing performance.)

1. A mechanical sealing structure capable of actively controlling lubricating and sealing performances is characterized in that: the intelligent temperature control device comprises an intelligent temperature control module and a leakage real-time monitoring module, wherein the intelligent temperature control module comprises an intelligent adjusting module and two temperature control modules connected with the intelligent adjusting module, and the two temperature control modules are respectively arranged on a static ring outer ring and a static ring inner ring of a mechanical sealing end face; the leakage real-time monitoring module comprises an infrared oil film measuring instrument and a force arm connected with the infrared oil film measuring instrument, wherein the force arm is connected with a static ring of the mechanical seal end face.

2. A mechanical seal configuration with actively controllable lubrication and sealing performance according to claim 1, wherein: the mechanical sealing end face comprises a rotating shaft, and a fastening ring, a static ring and a dynamic ring which are arranged on the rotating shaft, the outside of the fastening ring, the outside of the static ring and the outside of the dynamic ring are sealed by a sealing cavity, and lubricating oil is filled in the sealing cavity; the fastening ring is fixedly connected with the rotating shaft through a set screw, the fastening ring is connected with the movable ring through a guide rod, a sealing ring is sleeved on the guide rod, and an elastic unit is connected between the sealing ring and the fastening ring; the outer ring and the inner ring of the static ring are respectively provided with an annular groove, and a temperature control module is arranged in the annular groove.

3. A mechanical seal configuration with actively controllable lubrication and sealing performance according to claim 2, wherein: the sealing ring section be the L type, one limit of L type sealing ring inserts between rotating ring and the axis of rotation, be provided with the rotating ring sealing washer between L type sealing ring and rotating ring, the axis of rotation.

4. A mechanical seal configuration with actively controllable lubrication and sealing performance according to claim 2, wherein: and a static ring sealing ring is arranged between the static ring and the sealing cavity.

5. A method for actively controlling lubrication and sealing performance, comprising: the temperature control module is arranged on the outer ring of the static ring and the inner ring of the static ring of the mechanical sealing end face, the temperature of the inner ring and the temperature of the outer ring are accurately adjusted through the temperature control module, so that a required temperature field is formed on the sealing end face, the temperature field is monitored in real time through the infrared oil film measuring instrument, the end face oil film thickness is acquired through the data acquisition card, the leakage amount of the end face lubricating oil is reflected through the oil film thickness, and the temperature of the inner ring and the outer ring of the static ring is adjusted again according to the leakage amount until the leakage amount of the lubricating oil reaches a specified range.

6. A method for actively controlling the lubricating and sealing performance is characterized by comprising the following steps:

1) design of an intelligent temperature control module: the temperature control module is arranged on the static ring, and an annular groove is formed in the outer ring of the static ring and used for installing an outer ring temperature control unit; an annular groove is formed in the inner ring of the static ring and used for installing an inner ring temperature control unit;

2) installing a force arm on the static ring, connecting the force arm with an infrared oil film measuring instrument, measuring the thickness of an oil film between the dynamic ring and the static ring, acquiring the thickness of the oil film on the end surface by a data acquisition card, and judging the leakage amount of lubricating oil on the end surface by using a computer through the thickness of the oil film, namely judging the leakage amount of the lubricating oil on the end surface by using a low film thickness corresponding to a low leakage amount and a high leakage amount by using a high film thickness corresponding to a high leakage amount;

3) if the thickness of the oil film is higher than the upper limit of the set value, the lubricating oil on the end face is sufficient, the leakage amount of the lubricating oil is higher, and the leakage of the lubricating oil needs to be inhibited;

4) if the thickness of the oil film is lower than the lower limit of the set value, the lubricating oil on the end face is deficient, the lubricating oil on the end face is lack of lubrication, and a lubricating condition needs to be created;

5) if the oil film thickness is between the set upper and lower limit values, the leakage rate of the lubricating oil is normal, and the lubricating oil does not need to be regulated and controlled by creating a temperature gradient, so that all the lubricating oil works normally.

7. A method for actively controlling lubrication and sealing performance, comprising: the specific process for inhibiting the lubricating oil leakage in the step 3) is as follows:

3.1) the computer transmits a signal to the temperature control module, the temperature of the inner ring temperature control module is slowly increased, the temperature of the outer ring temperature control module is slowly reduced, a temperature field with a cold outer end and a hot inner end is formed on the sealing end surface, the flowing of lubricating oil is regulated and controlled, and the leakage of the lubricating oil is inhibited;

and 3.2) monitoring the working condition in real time by the temperature control module and the infrared oil film measuring instrument, repeating the step 3.1) if the oil film thickness measured by the infrared oil film measuring instrument is still higher than the upper limit of the set value, recording the temperature field at the moment until the oil film thickness is not higher than the set value, and maintaining the state by the temperature control module.

8. A method for actively controlling lubrication and sealing performance, comprising: the specific process for creating the lubricating condition in the step 4) is as follows:

4.1) the computer transmits signals to the temperature control module, the temperature of the inner ring temperature control module is slowly reduced, meanwhile, the temperature of the outer ring temperature control module is slowly increased, a temperature field with a hot outer end and a cold inner end is formed on the sealing end surface, the flowing of lubricating oil is regulated and controlled, and a lubricating condition is created;

4.2) the temperature control module and the infrared oil film measuring instrument monitor the working condition in real time, if the oil film thickness measured by the infrared oil film measuring instrument is lower than the lower limit of the set value, the step 4.1) is repeated until the oil film thickness is not lower than the set value, the temperature field is recorded at the moment, and the temperature control module maintains the state.

Technical Field

The invention relates to the field of mechanical design and automatic control, in particular to a mechanical sealing structure capable of actively controlling lubricating and sealing performances and a control method thereof.

Background

The mechanical seal is an important part in the modern rotary mechanical shaft seal, and the principle of the mechanical seal is that the movable ring and the static ring are tightly attached and relatively slide by an elastic compensation mechanism, so that the aim of preventing fluid leakage is fulfilled. The contact type mechanical seal has simple structure, convenient manufacture and low maintenance cost, and is widely applied to equipment in the industrial fields of petrochemical industry, aerospace, ships and the like. With the rapid development of modern mechanical equipment in large scale, high efficiency and high reliability, the use environment of mechanical seal is gradually changing to high parameter, and it is required to maintain reliable working state under severe working conditions such as high speed, high pressure, high temperature and complex medium. According to incomplete statistics, about 80% of mechanical seal failures are caused by frictional wear due to direct end face contact, which is higher in particular operating conditions.

Lubrication and sealing performance are two key indexes of end face mechanical sealing, a contradiction relationship exists between the lubrication performance and the end face mechanical sealing, end face leakage is increased due to the fact that the lubrication performance is improved, end face abrasion is aggravated due to the fact that leakage is reduced, and the difficulty of coordinating the lubrication performance and the sealing performance is the difficulty of contact type end face sealing design. Aiming at the contradiction relation between the lubrication and leakage characteristics of the mechanical seal, researchers provide a multi-objective optimization design method, namely, priorities are set according to the requirements of actual working conditions on the lubrication and sealing performances, and the two are coordinately optimized.

The thought provides a feasible scheme for prolonging the service life of the mechanical seal, but the contradiction cannot be fundamentally solved. Recently, researchers find that the temperature field can be constructed to drive lubricating oil to flow between interfaces, which means that the lubricating oil can be anchored on the end face of the mechanical seal through reasonably designing the temperature field, so that the lubricating requirement of the end face of the mechanical seal can be ensured, and the sealing medium can be prevented from leaking from the end face.

Disclosure of Invention

The invention aims to solve the problems in the prior art and provides a mechanical sealing structure capable of actively controlling lubricating and sealing performances and a control method thereof.

The invention provides a mechanical sealing structure capable of actively controlling lubricating and sealing performances, which comprises an intelligent temperature control module and a leakage real-time monitoring module, wherein the intelligent temperature control module comprises an intelligent adjusting module and two temperature control modules connected with the intelligent adjusting module, and the two temperature control modules are respectively arranged on a static ring outer ring and a static ring inner ring of a mechanical sealing end face; the leakage real-time monitoring module comprises an infrared oil film measuring instrument and a force arm connected with the infrared oil film measuring instrument, wherein the force arm is connected with a static ring of the mechanical seal end face.

The mechanical sealing end face comprises a rotating shaft, and a fastening ring, a static ring and a dynamic ring which are arranged on the rotating shaft, the outside of the fastening ring, the outside of the static ring and the outside of the dynamic ring are sealed by a sealing cavity, and lubricating oil is filled in the sealing cavity; the fastening ring is fixedly connected with the rotating shaft through a set screw, the fastening ring is connected with the movable ring through a guide rod, a sealing ring is sleeved on the guide rod, and an elastic unit is connected between the sealing ring and the fastening ring; the outer ring and the inner ring of the static ring are respectively provided with an annular groove, and a temperature control module is arranged in the annular groove.

The sealing ring section be the L type, one limit of L type sealing ring inserts between rotating ring and the axis of rotation, be provided with the rotating ring sealing washer between L type sealing ring and rotating ring, the axis of rotation.

And a static ring sealing ring is arranged between the static ring and the sealing cavity.

The invention also provides a method capable of actively controlling the lubricating and sealing performance, wherein the temperature control modules are arranged on the outer ring and the inner ring of the static ring of the mechanical sealing end surface, the temperature of the inner ring and the outer ring is accurately adjusted through the temperature control modules, so that a required temperature field is formed on the sealing end surface, the temperature field is monitored in real time by using an infrared oil film measuring instrument, the oil film thickness of the end surface is acquired through the data acquisition card, the leakage rate of the lubricating oil on the end surface is reflected through the oil film thickness, and the temperature of the inner ring and the outer ring of the static ring is adjusted again according to the leakage rate until the leakage rate of the lubricating oil reaches a specified range.

The specific process of the invention comprises the following steps:

1) design of an intelligent temperature control module: the temperature control module is arranged on the static ring, and an annular groove is formed in the outer ring of the static ring and used for installing an outer ring temperature control unit; an annular groove is formed in the inner ring of the static ring and used for installing an inner ring temperature control unit.

2) The static ring is provided with a force arm which is connected with an infrared oil film measuring instrument, the thickness of the oil film between the dynamic ring and the static ring is measured, the thickness of the oil film on the end surface is acquired by a data acquisition card, and the leakage amount of the lubricating oil on the end surface is judged by utilizing the thickness of the oil film through a computer, namely the low leakage amount is corresponding to the low film thickness, and the high leakage amount is corresponding to the high film thickness.

3) If the thickness of the oil film is higher than the upper limit of the set value, the lubricating oil on the end face is sufficient, the leakage amount of the lubricating oil is higher, and the leakage of the lubricating oil needs to be inhibited;

3.1) the computer transmits a signal to the temperature control module, the temperature of the inner ring temperature control module is slowly increased, the temperature of the outer ring temperature control module is slowly reduced, a temperature field with a cold outer end and a hot inner end is formed on the sealing end surface, the flowing of lubricating oil is regulated and controlled, and the leakage of the lubricating oil is inhibited;

and 3.2) monitoring the working condition in real time by the temperature control module and the infrared oil film measuring instrument, repeating the step 3.1) if the oil film thickness measured by the infrared oil film measuring instrument is still higher than the upper limit of the set value, recording the temperature field at the moment until the oil film thickness is not higher than the set value, and maintaining the state by the temperature control module.

4) If the thickness of the oil film is lower than the lower limit of the set value, the lubricating oil on the end face is deficient, the lubricating oil on the end face is lack of lubrication, and a lubricating condition needs to be created;

4.1) the computer transmits signals to the temperature control module, the temperature of the inner ring temperature control module is slowly reduced, meanwhile, the temperature of the outer ring temperature control module is slowly increased, a temperature field with a hot outer end and a cold inner end is formed on the sealing end surface, the flowing of lubricating oil is regulated and controlled, and a lubricating condition is created;

4.2) the temperature control module and the infrared oil film measuring instrument monitor the working condition in real time, if the oil film thickness measured by the infrared oil film measuring instrument is lower than the lower limit of the set value, the step 4.1) is repeated until the oil film thickness is not lower than the set value, the temperature field is recorded at the moment, and the temperature control module maintains the state.

5) If the oil film thickness is between the set upper and lower limit values, the leakage rate of the lubricating oil is normal, and the lubricating oil does not need to be regulated and controlled by creating a temperature gradient, so that all the lubricating oil works normally.

The invention has the beneficial effects that: a temperature control module is designed on a sealing end face to regulate and control the end face temperature, an infrared oil film measuring instrument is designed to monitor the end face lubrication state in real time, an end face temperature field is accurately regulated according to the lubrication state, a temperature gradient is constructed to anchor lubricating oil at an appointed position, and finally the coordination control of mechanical sealing lubrication and sealing performance is realized. The implementation of the invention provides a new design idea for the mechanical seal which is in service in extreme working conditions and has higher requirements on lubrication and sealing performance.

Drawings

Fig. 1 is a schematic diagram of the present invention.

FIG. 2 is a diagram showing experimental results.

Fig. 3 is a structure view of the rotating ring.

Fig. 4 is a stationary ring structure diagram.

Fig. 5 is a schematic view of a mechanical seal structure capable of actively controlling lubrication and sealing performance.

Fig. 6 is a control schematic.

In the drawings, 1-the fastening ring; 2-tightening the screw; 3-a guide rod; 4-a resilient element; 5-a sealing ring; 6-moving ring; 7-a moving ring sealing ring; 8-lubricating oil; 9-outer ring temperature control unit; 10-a stationary ring; 11-outer ring thermal sensor; 12-sealing the cavity; 13-stationary ring seal ring; 14-anti-rotation pins; 15-inner ring thermal sensors; 16-an inner ring temperature control unit; 17-infrared oil film measuring instrument; 18-a rotating shaft; 19-a guide rod hole; 20-inner ring temperature control unit mounting groove; 21-outer ring temperature control unit mounting groove; 22-anti-rotation pin hole.

Detailed Description

The invention is further described below with reference to the accompanying drawings.

As shown in FIG. 1, when a liquid is placed on a solid surface, it can be regarded as a system where three phases of gas, liquid and solid coexist. The existence of the temperature gradient on the surface of the solid can change the solid-liquid interfacial tension gamma_SLAnd the contact angle theta ensures that the stress at the three-phase interface is not balanced any more, so that the driving force for driving the liquid to move is generated, and the liquid is driven to creep from the hot end to the cold end. FIG. 2 is a graph showing the results of preliminary experiments, and it can be seen that the distance between two planesThe lubricating oil can slowly move from a high-temperature area to a low-temperature area under the action of the temperature gradient. The heat driving flow can be used for inhibiting the directional leakage of lubricating oil at the end face of a dynamic/static ring of the mechanical seal.

Based on the principle, firstly, a static ring structure is modified, a temperature field is constructed on the end face of the static ring structure, and meanwhile, an infrared oil film measuring instrument is adopted to monitor the oil film thickness of the end face of the dynamic/static ring in real time; the oil film thickness is related to the leakage amount of the lubricating oil, and the low film thickness reflects the low leakage amount and the high film thickness reflects the high leakage amount. According to the oil film thickness acquired in real time, the amplitude and the variation trend of the oil film thickness are obtained through computer analysis, so that a temperature field required by the end face is determined, corresponding electric signals are input into a temperature control module of the sealing end face, the temperature difference of the end face is accurately adjusted, the leakage rate of a sealing medium is adjusted and controlled, and finally the lubricating and sealing performance coordination control of the mechanical sealing device is achieved.

The technical scheme of the mechanical seal with internal leakage of lubricating oil is described in detail below by taking the example of the mechanical seal with internal leakage of lubricating oil.

The key point of the invention is to anchor lubricating oil on the mechanical seal end face by constructing temperature gradient, and the key point is to design an intelligent temperature control module and monitor the oil film thickness, which are as follows:

1. design of an intelligent temperature control module: the temperature control module is arranged on the static ring, and an annular groove is formed in the outer ring (shown in figure 4) of the static ring and used for installing an outer ring temperature control unit (shown in figure 5); an annular groove is formed in the inner ring of the static ring (shown in figure 4) and used for installing an inner ring temperature control unit (shown in figure 5). As shown in an assembly drawing in fig. 5, during normal operation, the temperature of the inner ring and the outer ring is accurately adjusted through the temperature control module, so that a required temperature field is formed on the sealing end face.

2. And (3) monitoring leakage in real time: in order to monitor the leakage amount of the end face lubricating oil in real time, a force arm is designed on the static ring and is connected with an infrared oil film measuring instrument, the thickness of the oil film between the dynamic ring and the static ring is measured, the thickness of the end face oil film is acquired by a data acquisition card, the leakage amount of the end face lubricating oil is reflected by the thickness of the oil film, namely the low leakage amount is corresponding to the low film thickness, and the high leakage amount is corresponding to the high film thickness.

Referring to fig. 6, the specific implementation steps are as follows:

(1) and (4) operating the system, and enabling the temperature control module and each sensor to work normally.

(2) The oil film thickness of the end face is measured in real time by the infrared oil film measuring instrument, and whether the oil film thickness of the end face exceeds a set value is judged by the computer.

(3) If the oil film thickness is higher than the upper limit of the set value, it means that the lubricating oil is sufficient at the end face, which means that the leakage amount of the lubricating oil is too high, and it is necessary to appropriately suppress the leakage of the lubricating oil.

The computer transmits a signal to the temperature control module, the temperature of the inner ring temperature control module is slowly increased, the temperature of the outer ring temperature control module is slowly reduced, a temperature field with a cold outer end and a hot inner end is formed on the sealing end surface, the flowing of lubricating oil is regulated and controlled, and the leakage of the lubricating oil is inhibited;

the temperature control module and the infrared oil film measuring instrument monitor the working condition in real time, and if the oil film thickness measured by the infrared oil film measuring instrument is still higher than the upper limit of the set value, the steps are repeated; and recording the temperature field until the oil film thickness is not higher than a set value, and maintaining the state by the temperature control module.

Therefore, the coordination control of the lubrication and the sealing performance of the mechanical sealing end face is realized.

(4) If the oil film thickness is lower than the lower limit of the set value, the lubricating oil on the end face is short, which means that the lubricating oil on the end face is lack of lubrication, and the proper creation of lubricating conditions is needed.

The computer transmits a signal to the temperature control module, the temperature of the inner ring temperature control module is slowly reduced, the temperature of the outer ring temperature control module is slowly increased, a temperature field with a hot outer end and a cold inner end is formed on the sealing end surface, the flow of lubricating oil is regulated and controlled, and a lubricating condition is created;

and the temperature control module and the infrared oil film measuring instrument monitor the working condition in real time, if the oil film thickness measured by the infrared oil film measuring instrument is lower than the lower limit of the set value, the steps are repeated until the oil film thickness is not lower than the set value, the temperature field at the moment is recorded, and the temperature control module maintains the state.

Therefore, the coordination control of the lubrication and the sealing performance of the mechanical sealing end face is realized.

(5) If the oil film thickness is between the set upper and lower limit values, the leakage rate of the lubricating oil is normal, and the lubricating oil does not need to be regulated and controlled by creating a temperature gradient, so that all the lubricating oil works normally.

The mechanical sealing structure capable of actively controlling the lubricating and sealing performances is shown in fig. 5, and the specific structure is as follows: the sealing device comprises a rotating shaft 18, and a fastening ring 1, a static ring 10 and a dynamic ring 6 which are arranged on the rotating shaft 18, wherein the outside of the fastening ring 1, the static ring 10 and the dynamic ring 6 is sealed by a sealing cavity 12, and the sealing cavity 12 is filled with lubricating oil 8; the fastening ring 1 is fixedly connected with the rotating shaft 18 through a fastening screw 2, the fastening ring 1 is connected with the movable ring 6 through a guide rod 3, a seal 5 ring is sleeved on the guide rod 3, and an elastic unit 4 is connected between the seal ring 5 and the fastening ring 1; as shown in fig. 4, the outer ring and the inner ring of the stationary ring are respectively provided with a temperature control unit installation annular groove, a temperature control module is installed in the annular groove, wherein the outer ring temperature control unit 9 is installed in the inner ring temperature control unit installation groove 20, and the inner ring temperature control unit 16 is installed in the outer ring temperature control unit installation groove 21. An anti-rotation pin hole 22 is formed in the static ring, and an anti-rotation pin 14 is inserted between the sealing cavity and the static ring. A force arm penetrating through the sealing cavity is arranged in the static ring, and the force arm is connected with an outer ring thermal sensor 11; the infrared oil film measuring instrument 19 is connected with an inner ring thermal sensor 15, and the inner ring thermal sensor 15 is connected with an outer ring thermal sensor 11.

As shown in FIG. 3, the movable ring 6 is provided with a guide rod hole 19, and the guide rod 3 is inserted into the guide rod hole 19.

The sealing ring section be the L type, one limit of L type sealing ring inserts between rotating ring and the axis of rotation, be provided with rotating ring sealing washer 7 between L type sealing ring and rotating ring, the axis of rotation.

And a static ring sealing ring 13 is arranged between the static ring and the sealing cavity.

While the invention has been described in terms of its preferred embodiments, it will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention.