CN105443857A - Variable-damping vibration attenuation and noise reduction device for valve - Google Patents

Abstract

The utility model relates to a variable damping vibration reduction and noise reduction device for valves, which belongs to the field of vibration control. The combined variable damping vibration and noise reduction device includes a vibration transmission clamp, a magnetorheological fluid damper, and a vibration acquisition analysis and control system; the device transmits vibration to the magnetorheological fluid damper through the vibration transmission clamp installed on the valve stem, Drive the moving shear piece to perform shearing motion in the magneto-rheological fluid, and generate damping force to consume the vibration energy of the valve; the vibration acquisition analysis and control system monitors the change of the vibration parameters of the valve in real time, and according to the vibration parameters, combined with the valve size, type and The structural parameters of the damper adjust the damping force of the damper, so as to realize the closed-loop active control of the vibration of the valve system. The combined variable damping and vibration reduction device of the present invention can effectively reduce the vibration generated by different types of valves under different inducements, and realize the vibration and noise control of the valve under variable working conditions and variable opening degrees.

Description

A variable damping vibration reduction and noise reduction device for valves

technical field

The invention is a variable damping vibration reduction and noise reduction device applied to valves, which is mainly used to control the vibration and noise of various valves in the pipeline system, including ball valves, gate valves, butterfly valves, stop valves and control valves, etc., belonging to vibration control technology field.

technical background

In recent years, with the rapid development of petrochemical, metallurgy, electric power, shipbuilding, aerospace and other industries, large-scale and integration have become the development trend, making the safety and stability of the pressure piping system more and more the focus of attention. The medium conveyed in the pressure piping system is often flammable, explosive, toxic, high temperature, high pressure, etc., which are highly dangerous. Once a little careless, it may cause leakage, explosion, combustion, poisoning, environmental pollution, etc. in the pressure piping. ACCIDENT. A valve is a mechanical device that controls the flow, flow direction, pressure, temperature, etc. of a fluid medium, and is a basic component in a piping system. When the valve is disturbed by the outside world (inlet and outlet pressure mutations, pipeline temperature, flow changes, and even gas-liquid two-phase flow), it will cause valve vibration, produce severe noise, and even damage the valve structure, seriously endangering equipment and piping systems safe and stable operation. Therefore, effective measures must be taken to control valve vibration and noise.

The vibration and noise of the valve mainly comes from two aspects: the vibration of the fluid conveying machinery (compressor, pump, etc.) and the transmission of the connecting pipeline cause the valve to vibrate and generate noise; the vibration and noise induced when the fluid passes through the valve. Among them, the fluid noise can be divided into: ①The pressure change in the valve body and the impact of the fluid on certain parts of the valve cause it or the piping connected to it to vibrate, or even resonate with noise, which is mechanical vibration noise; ②When the fluid passes through the valve The flow, along the valve core, generates an annular jet and separates from the wall surface. The separation boundary layer is very unstable and generates vortices, which cause resonance in the cavity and generate noise, which is vortex noise; Turbulent mixing is generated, which destroys the stable state of the fluid and causes a huge disturbance, resulting in strong injection noise, and even after the fluid passes through the valve, the pressure behind the valve is lower than the fluid gasification pressure, causing the turbulent fluid to gasify rapidly and form cavitation, When the cavitation is formed and exploded, strong vibration noise is generated, that is, hydraulic noise. The research shows that the frequency with greater pressure pulsation intensity in the valve presents a continuous broadband characteristic, and the corresponding occurrences are concentrated in the throat of the valve seat, near the upper surface of the valve seat and the lower surface of the valve core. During the opening and closing process of the valve and the condition of flow change, the force of the fluid is transient hydrodynamic force, which is more complex and unstable than the flow field when the valve is in normal operation, and it is easy to aggravate the vibration of the valve, resulting in greater noise. Therefore, it is necessary to use appropriate technical means to reduce the vibration and noise of the valve, especially in the conditions of variable flow, variable pressure and valve opening and closing.

At present, there are two main methods to reduce valve vibration and noise: source vibration reduction and noise reduction and transmission vibration reduction and noise reduction. Source noise reduction can be achieved by changing the structure of the valve body or valve cavity, adding an orifice plate or a porous mesh cover, and multi-stage decompression. Smith and Luloff proposed in the literature "The effect of seat geometry on gate valve noise" that modifying the size of the valve seat (such as chamfering) also has a certain effect on reducing vibration and noise (Journal of Pressure Vessel Technology-Transactions of the ASME, 2000, 122(4): 401-407). In "Noise measurement and numerical simulation of oil flow in pressure control valves", Ueno et al. used experimental and numerical methods to study the valve noise caused by cavitation. In the simulation model, the flow was simplified as laminar flow of unsteady incompressible fluid. The cavitation effect formed by circulating flow has a good inhibitory effect (JSME International Journal Series B-Fluids and Thermal Engineering, 1994, 37 (2): 336-341). Gao Yiqiu, Zhou Zhendong and Xi Jun adopted a multi-stage orifice pressure drop structure in "Improvement and Performance Calculation of Throttling Steam Control Valves". Numerical calculations show that the improved structure greatly reduces the steam flow velocity, improves the steam The erosion effect of the flow reduces the injection noise and improves the safety and reliability of the steam control valve (Steam Turbine Technology, Vol. 54, No. 4, pp. 261-263, 2012). The muffler is used in the exhaust system, which can block the propagation of sound waves and is an effective tool for propagating vibration and noise reduction. For example, expansion chamber mufflers, micro-perforated plate mufflers, orifice plates are widely used in pipelines and at the outlet of valves, with good noise reduction effects. Wang Wenqi and He Youjing introduced the structure of the muffler of the high-pressure boiler safety valve of Beijing No. 2 Thermal Power Plant in "Treatment of Exhaust Noise from Boiler Safety Valve". When the safety valve operates mechanically, the muffler's noise reduction value is 34dB(A), and the total loudness is reduced by about 85%. On the ground 70m away from the safety valve muffler outlet, the exhaust noise when the safety valve operates can no longer be heard The effect of vibration reduction and noise reduction is very obvious (Environmental Protection, Issue 5, 1979, pages 28-29).

There are many reasons for the vibration and noise of valves. The existing vibration and noise reduction methods are often only effective for certain vibration and noise. The injection noise downstream of the valve is ineffective; multi-stage decompression can reduce the fluid velocity in the valve, reduce the vortex in the valve cavity, and improve the coupling vibration and noise between the fluid and the valve body, but its structure is complex, and the mechanism of multi-stage decompression is still unclear , the design is difficult, and it is impossible to improve the fluid mechanical vibration and noise; the muffler has a complex structure, large volume, and heavy weight, and it is prone to frequent maintenance, poor noise reduction effect, and short service life.

Adding external damping to the vibration system to dissipate motion energy, reduce the dynamic response of the structure, and reduce noise is a very effective means in engineering applications. It is widely used in aerospace, petroleum and petrochemical, building bridges, vehicles and ships and other fields. Common damping and vibration reduction devices mainly include: friction damper, viscous damper, viscoelastic damper, magnetic current (current) variable damper and squeeze film damper (SFD).

The friction damper produces slip or deformation under the predetermined load before the main structural member yields, and relies on friction or damping to dissipate vibration energy. At the same time, since the natural vibration period is lengthened after the structural deformation, the vibration input is reduced, thereby reducing structural vibration purpose of the response. Friction dampers are simple in structure, easy to obtain materials, and low in cost, and are often used to improve the earthquake resistance of engineering structures. The Squeeze Oil Film Damper (SFD) damper is mainly used in rotating machinery, which can effectively reduce the vibration of high-speed rotors, especially greatly reduce the amplitude when the critical speed is exceeded, and reduce the critical speed of the rotor. It is widely used in aviation, aerospace and Nuclear Industry. The basic principle of the viscous damper is that the viscous fluid flows in the damper mechanism and interacts with the damper structure, so that the kinetic energy of the fluid is converted into heat energy for energy consumption. The conversion of kinetic energy to thermal energy of viscous fluid is carried out through two aspects: friction energy consumption and porosity effect energy consumption. Viscous dampers were first used in the munitions industry in the middle of the 19th century to overcome the rebound force when launching projectiles. They were then widely used in vehicles, aerospace and military systems. In recent years, they have also been widely used in civil bridges and petrochemical pipelines. The magnetorheological fluid damper is a new type of intelligent damping and vibration reduction device. It mainly produces a damping force that is close to the optimal active control force according to the change of the input voltage (current), and performs energy consumption and vibration reduction for the system. The magnetorheological fluid damper uses the magnetorheological effect, that is, the magnetorheological fluid exhibits low-viscosity Newtonian fluid characteristics under the condition of no magnetic field, which produces a small damping force, but under the action of a strong magnetic field, it exhibits high viscosity and low viscosity. Fluid properties of fluidity, producing large damping force. Due to its advantages of low energy consumption, large damping force and fast structural response, it has been successfully applied to the structural vibration control of vehicles, buildings, bridges and other fields, and it has also attracted increasing attention in the field of rotating machinery vibration. Ma Xinna, Yang Shaopu, and Di Shuling established a 17-degree-of-freedom high-speed locomotive lateral semi-active model based on magnetorheological fluid dampers in "Research on Transverse Semi-Active Vibration Control of High-speed Locomotives Based on Magneto-rheological Fluid Dampers". Adaptive fuzzy control strategy for modifying the input parameters of the magnetorheological fluid damper can effectively attenuate the lateral vibration of the locomotive; in the low-frequency stage, especially in the range of 5Hz to 8Hz, which has a great impact on ride comfort, it can significantly improve the stability and ride quality of high-speed locomotives Comfort (Vibration and Shock, Vol. 28, No. 7, pp. 126-130, 2009). Wang Xiuyong, Chen Zhengqing et al. conducted a comprehensive simulation of the damping characteristics of the magnetorheological fluid damper-cable system in "Research on the Vibration Control of Magnetorheological Fluid Dampers on Stay Cables", and applied magnetorheological fluid damping to the Dongting Lake Bridge. Experimental research on the open-loop control of cable vibration with a liquid damper, the results show that the damper can effectively suppress the wind and rain vibration of the cable, and the test and simulation results are in good agreement (Engineering Mechanics, Vol. 22-28 pages). Keun-JooKim in "OptimalpositioningandcontrolofaMR-squeezefilmdamperforreducingunbalancedvibrationsinarotorsystemwithmultiplemasses" also showed that the unbalanced response of the rotor system at the critical speed is obviously weakened due to the damping effect of the magnetorheological fluid damper (Journal of Vibration and Acoustics2009 Volume 131 Issue 4 0410061-04).

Based on the many advantages of damping vibration reduction technology in the field of structural vibration reduction, combined with the characteristics of valve vibration and noise, a variable damping vibration and noise reduction device based on magneto-rheological fluid dampers is designed. The vibration and noise of the valve realize the active control of the vibration and noise of the valve under variable working conditions and variable openings, and achieve the purpose of reducing vibration and noise of the valve.

Contents of the invention

The present invention designs a variable damping vibration reduction and noise reduction device installed on the valve stem, aiming at the continuous broadband vibration characteristics of the valve under the action of machinery and fluid in the pipeline valve system, through the designed variable damping vibration reduction and noise reduction device. The active control of valve vibration and noise, especially the control of valve vibration and noise under variable working conditions and variable openings, achieves the purpose of valve vibration and noise reduction. The proposed variable damping device adopts closed-loop active control, which can provide timely and large enough damping force according to the vibration energy of the system, and consume the vibration energy of the system. The device is effective for the vibration of the valve during normal operation and the variable load under variable operating conditions and variable openings, and responds quickly to vibrations in all degrees of freedom. The device also has the advantages of simple structure, easy loading and unloading and installation, flexible installation space, stable performance, good practicability, strong adaptability and long service life.

To achieve the above object, the present invention takes the following technical solutions:

The variable damping vibration reduction and noise reduction device includes a vibration transmission clip, a magneto-rheological fluid damper, and a vibration collection analysis and control system. The function of the vibration transmission clamp is to transmit the vibration from the valve stem to the damper. There are two types of vibration transmission clamps because the valve stem has two types: the threaded valve stem for spiral movement and the optical axis valve stem for linear reciprocating movement. . The first is mounted on a threaded stem, including threaded bushings, rolling bearings, optical bushings and linear bearings. Among them, the threaded sleeve and the valve stem are threaded, and the rolling bearing is installed on the threaded sleeve. The inner ring can rotate with the threaded sleeve and the valve stem and move in a straight line in the axial direction. The outer ring does not rotate and only moves in a straight line in the axial direction; On the outer ring of the rolling bearing, it can move linearly along the axial direction with the outer ring of the rolling bearing; the linear bearing is installed on the optical sleeve and connected with the inner cylinder of the magneto-rheological fluid damper, which allows the optical sleeve to move linearly in the axial direction. No axial movement, no rotation. Through such a structure, it can not only ensure the free spiral movement of the valve stem, but also transmit the vibration of the valve stem to the damper. The second type is installed on the optical shaft valve stem, including optical shaft sleeve and linear bearing. The optical shaft sleeve is installed on the optical shaft valve stem, and makes axial reciprocating linear motion with the valve stem; the linear bearing is installed on the optical shaft sleeve, and is connected with the inner cylinder of the magneto-rheological fluid damper, allowing the optical shaft sleeve and the valve stem to reciprocate in a straight line Movement, the bearing outer ring itself does not move. Through such a structure, it can not only ensure the free reciprocating movement of the valve stem, but also transmit the vibration of the valve stem to the damper. The magnetorheological fluid damper is mainly composed of an inner cylinder, a dynamic shear plate, a static shear plate, a positioning sleeve, a coil winding cylinder, a coil, an outer cylinder and an end cover. The inner cylinder of the damper is connected to the linear bearing, and the outer cylinder of the damper The cylinder is fixedly connected to the support or foundation. The vibration of the valve stem is transmitted to the inner cylinder of the magneto-rheological fluid damper through the vibration transmission clip, which drives the moving shear piece to perform shearing motion in the magnetorheological fluid, and the damping force generated consumes vibration energy, thereby reducing the valve pressure. The vibration amplitude of the rod can achieve the purpose of damping vibration and noise of the valve.

In the vibration acquisition analysis and control system, the vibration acquisition analysis system includes a vibration acceleration (or velocity or displacement) sensor, a signal conditioning module, a data acquisition card, vibration analysis software and a computer. The vibration sensor is installed on the valve stem, which converts the vibration signal into an electrical signal in real time, and connects to the signal conditioning module through wiring for rectification, filtering, amplification, and then enters the data acquisition card, which is converted into a digital signal that can be recognized by the computer through the acquisition card. , and then connect the signal to the computer and calculate and analyze the vibration parameters such as amplitude and frequency spectrum by the vibration analysis software. The control system includes vibration control software, analog output modules and actuators. The vibration control software can calculate the required damping force according to the vibration parameters such as amplitude and frequency spectrum, combined with the valve size, type and damper structure parameters, and output the control signal in real time, and pass it to the analog output module. Converted into an analog signal, passed to the actuator. The actuator includes an adjustable DC power supply and a magneto-rheological fluid damper. The analog control signal controls the output current of the adjustable DC power supply. The real-time control current is input to the coil of the magnetorheological fluid damper to generate a magnetic field that acts on the magnetorheological fluid in the damper to change the shear yield stress and Viscosity and other parameters, so as to generate controllable damping force, consume valve vibration energy at different amplitudes and frequencies, and achieve vibration reduction and noise reduction when the valve changes working conditions and opening degrees.

The present invention has the following characteristics:

(1) The device can reduce the vibration and noise caused by various reasons of the valve. The variable damping vibration reduction and noise reduction device transmits the vibration from the valve stem to the magneto-rheological fluid damper through the vibration transmission clip, and drives the shear plate to perform shearing motion in the damper, causing friction, and converting the vibration energy from mechanical energy to The heat energy is finally consumed in the damping material, which plays the role of damping and vibration reduction. The variable damping and noise reduction device is not sensitive to the cause of the valve vibration, whether it is the vibration of the fluid conveying machinery (compressor, pump, etc.) and the wave transmission of the connecting pipeline that causes the valve to vibrate and generate noise, or the fluid shock The mechanical vibration noise generated by the valve, or the vortex noise caused by the unstable fluid in the valve cavity, or the injection noise generated by the strong mixing of the fluid downstream of the valve, and the hydraulic noise generated by the cavitation rupture can be effectively suppressed.

(2) The vibration transmission clamp can effectively transmit the vibration of the valve to the magneto-rheological fluid damper without affecting the normal operation of the valve, especially the helical movement mode of the threaded valve stem, which is a difficulty in the vibration transmission of the valve . This transposition uses a combination of radial rolling bearings and linear bearings to achieve this purpose. The radial rolling bearings allow the valve stem to rotate, and the linear bearings allow the valve stem to reciprocate linearly in the circumferential direction. Through the combination of these two bearings, the valve stem can move freely. The helical movement works properly while vibrations are efficiently transmitted to the damper.

(3) The variable damping vibration reduction and noise reduction device adopts an integrated structure, that is, the vibration transmission clip, damper and valve stem of the device are integrated together, which has the characteristics of simple structure and high integration. The device omits the intermediate link, and the vibration transmission is effective and direct without loss. When the pipeline system changes working conditions or the opening of the valve changes, the vibration energy of the valve will change, and the required damping force will also change accordingly. The magnetorheological fluid damper provides the appropriate damping force according to the vibration energy, so as to control the valve in changing work. Condition, vibration when changing the opening degree.

(4) Real-time vibration acquisition analysis and control system, including vibration acquisition analysis and control system. The vibration acquisition system includes a vibration sensor, a signal conditioning module, a data acquisition card, vibration analysis software and a computer. Its main function is to collect and analyze vibration parameters such as valve amplitude and frequency spectrum in real time. The vibration control system includes vibration control software, analog output module, adjustable DC power supply and magneto-rheological fluid damper. The main function is to combine the vibration parameters obtained by the vibration acquisition and analysis system with the valve size, type and damper structure parameters. Calculate and analyze the damping force required for vibration control and the corresponding current, and then output the control signal to the adjustable DC power supply to adjust the current of the magnetorheological fluid damper coil, thereby changing the magnetic field strength, and then controlling the magnetorheological fluid damper The damping can achieve the purpose of actively reducing valve vibration and noise. The vibration acquisition and analysis system and the vibration control system form a closed-loop negative feedback control loop to monitor and control the vibration and noise of the valve in real time to ensure the stable and safe operation of the valve.

Compared with the existing valve vibration and noise reduction device, the present invention has the following advantages:

(1) The device can effectively suppress valve vibration and noise caused by mechanical vibration transmission of fluid conveying, fluid impact, vortex noise and injection noise, and has a wide range of applications.

(2) According to the type, size and structure of the valve, the installation position, quantity and structure of the device can be flexibly adjusted to reduce the vibration and noise of different types of valves and different vibration states.

(3) Real-time acquisition and control of valve vibration. By monitoring the vibration state of the valve and actively adjusting the damping size of the magneto-rheological fluid damper, it can not only suppress the vibration and noise of the valve when it is working stably, but also control the vibration of the valve under the condition of changing working conditions of the pipeline system and the opening of the valve. Ensure the long-term safe and stable operation of the valve.

(4) The damper provides a damping force related to the dynamic response speed, and does not bear static load, that is, it does not change the original support of the valve system, and does not affect the stiffness of the system.

Description of drawings

Figure 1 is a typical structural diagram of the variable damping and noise reduction device installed on the threaded valve stem

Figure 2 is a partial enlarged view of the shear sheet of the magnetorheological fluid damper

Figure 3 is a typical structural diagram of the variable damping vibration reduction and noise reduction device installed on the optical axis valve stem

Figure 4 is a flowchart of the control system of the variable damping vibration reduction and noise reduction device

Figure 5 is the connection diagram of the variable damping vibration reduction and noise reduction device installed on the stop valve

Figure 6 is the connection diagram of the variable damping and noise reduction device installed on the butterfly valve

In the figure: 1, screw; 2, coil; 3, positioning sleeve; 4, static shear piece; 5, dynamic shear piece; 6, inner cylinder; 7, rolling bearing; 8, threaded valve stem; 9, threaded shaft 10. Optical shaft sleeve; 11. Linear bearing; 12. Coil winding tube; 13. End cover; 14. Outer cylinder; 15. Optical shaft valve stem; 16. Optical shaft sleeve; 17. Magnetorheological fluid; 18 , vibration sensor; 19, vibration signal; 20, signal conditioning module; 21, data acquisition card; 22, computer; 23, control signal; 24, analog output module; 25, adjustable DC power supply; 26, valve body; 27, Support; 28, O ring.

detailed description

The present invention will be described in further detail below in conjunction with the accompanying drawings.

The invention is a variable damping vibration reduction and noise reduction device for valves, which monitors the valve vibration in real time, continuously and actively adjusts the damping force of the magneto-rheological fluid damper on-line, and realizes the stable working condition, variable working condition and valve operation of the valve in the pipeline system. Vibration and noise control under variable opening. Figure 1 is a typical structural diagram of a variable damping, vibration and noise reduction device installed on a threaded valve stem. The device is driven by the control system of the variable damping vibration reduction and noise reduction device. The device mainly includes a vibration transmission clamp and a magneto-rheological fluid damper; the vibration transmission clamp is composed of a threaded bushing 9, a rolling bearing 7, an optical bushing 10 and a linear bearing 11 The magnetorheological fluid damper is composed of an inner cylinder 6, a dynamic shear piece 5, a static shear piece 4, a positioning sleeve 3, a coil winding cylinder 12, a coil 2, an outer cylinder 14 and an end cover 13; the threaded bushing 9 Installed with the valve stem 8 through threads, the rolling bearing 7 is installed on the threaded bushing 9, the inner ring of the rolling bearing 7 makes a spiral movement with the threaded bushing 9 and the valve stem 8, and the outer ring of the rolling bearing 7 does not rotate but only moves linearly along the axial direction ; The optical shaft sleeve 10 is installed on the outer ring of the rolling bearing 7, and can move linearly along the axial direction with the outer ring of the rolling bearing 7; the linear bearing 11 is installed on the optical shaft sleeve 10, which allows the optical shaft sleeve 10 to move linearly along the axial direction It neither moves in the axial direction nor rotates; the linear bearing 11 is connected to the inner cylinder 6 of the magneto-rheological fluid damper, the outer cylinder 14 of the damper is fixedly connected to the bracket 27 or the foundation, and the inner cylinder 6 is connected to the end cover 13 and the outer cylinder 14 The outer cylinder 14 and the end cover 13 are fastened and connected by the screws 1 in the circumferential direction of the end; the circumferential position in the end cover 13 is provided with a positioning sleeve 3, and the positioning sleeve 3 is Double-layer hollow ring structure, coil winding tube 12 is installed on the outer side, and inner tube 6 is installed on the inner side; dynamic shearing pieces 5 and static shearing pieces 4 are evenly arranged in a double-layer hollow structure of the positioning sleeve 3 , the dynamic shearing piece 5 is arranged on the side close to the inner cylinder 6, and the static shearing piece 4 is arranged on the side close to the coil winding barrel 12; when the valve stem 8 vibrates, the vibration can ensure the free spiral movement of the valve stem 8 through such a The vibration transmission clip is transmitted to the inner cylinder 6 of the damper, and then drives the moving shear piece 5 to perform shearing motion in the magneto-rheological fluid 17 to generate damping force and consume the vibration energy of the valve stem 8, thereby reducing the amplitude of the valve stem 8 , to reduce noise.

Fig. 3 is a typical structural diagram of the variable damping vibration reduction and noise reduction device installed on the optical axis valve stem. It mainly includes a vibration transmission clamp and a magnetorheological fluid damper; the vibration transmission clamp is composed of an optical bushing 16 and a linear bearing 11; the magnetorheological fluid damper is composed of a threaded bushing 9, a rolling bearing 7, an optical bushing 10 and a linear bearing 11 composition; the optical shaft sleeve 16 is installed on the optical shaft valve stem 15, and performs axial reciprocating linear motion with the valve stem 15; the linear bearing 11 is installed on the optical shaft sleeve 16, allowing the optical shaft sleeve 16 and the valve stem 15 to reciprocate and linearly move, The outer ring itself does not move; the linear bearing 11 is connected to the inner cylinder 6 of the magneto-rheological fluid damper, and the outer cylinder 14 of the damper is fixedly connected to the bracket 27 or the foundation. When the valve stem 15 vibrates, the vibration is transmitted to the damper inner cylinder 6 through such a vibration transmission clip that can ensure the reciprocating linear motion of the valve stem 14, and drives the moving shear piece 5 to perform shearing motion in the magnetorheological fluid 17, A damping force is generated to consume the vibration energy of the valve stem 15, thereby reducing the vibration amplitude of the valve stem 15 and achieving the purpose of reducing vibration and noise.

Fig. 4 is a flow chart of the control system of the variable damping vibration reduction and noise reduction device. Fig. 5 is a connection diagram of the variable damping, vibration and noise reduction device installed on the stop valve based on the control system of Fig. 4, and Fig. 6 is a connection diagram of the variable damping, vibration and noise reduction device installed on the butterfly valve. It mainly includes variable damping device, real-time vibration acquisition and analysis system and vibration control system. The real-time vibration acquisition system mainly includes a vibration sensor 18 , a signal conditioning module 20 and a data acquisition card 21 ; the vibration control system includes a computer 22 , an analog output module 23 and an adjustable DC power supply 25 . The vibration sensor 18 is installed on the bonnet flange and the valve stem to collect the vibration of the valve system valve body and valve stem in real time to obtain the vibration electrical signal 19, which is rectified, filtered and amplified by the signal conditioning module 20 and then entered into the data acquisition card 21 to be converted into a digital signal. The signal is calculated and analyzed by the computer 22 calculation and analysis software to obtain vibration parameters such as amplitude and frequency spectrum. The control software uses the relevant control algorithm to obtain the real-time control signal 23 according to the vibration parameters and combined with the valve size, type and damper structure parameters, and transmits it to the analog output. The module 24 converts the digital-to-analog signal into a control analog signal, and transmits it to the adjustable DC power supply 25 to adjust the current input to the magneto-rheological fluid damper coil 2 in real time to generate a controllable magnetic field to act on the magnetorheological fluid in the damper. Change the shear yield stress and viscosity related parameters of the magnetorheological fluid to obtain a controllable damping force, consume and attenuate valve vibrations at different amplitudes and frequencies, and form an active closed-loop control system of a real-time online continuously variable damping device to realize valve variable Vibration reduction and noise reduction for working conditions and variable openings.

The control algorithm is a servo control algorithm, a section control algorithm or a PID control algorithm.

Claims (4)

1. A variable damping, vibration reduction and noise reduction device for valves, characterized in that: the device is driven by the control system of the variable damping, vibration reduction and noise reduction device, and when the device is installed on a threaded valve stem, the device mainly includes Vibration transmission clamp and magnetorheological fluid damper; the vibration transmission clamp is composed of threaded bushing (9), rolling bearing (7), optical bushing (10) and linear bearing (11); the magnetorheological fluid damper consists of an inner cylinder (6), dynamic shear piece (5), static shear piece (4), positioning sleeve (3), coil bobbin (12), coil (2), outer cylinder (14) and end cap (13) Composition; the threaded bushing (9) and the valve stem (8) are installed through threads, the rolling bearing (7) is installed on the threaded bushing (9), and the inner ring of the rolling bearing (7) follows the threaded bushing (9) and the valve stem (8) Perform spiral motion, the outer ring of the rolling bearing (7) does not rotate and only moves linearly along the axial direction; the optical sleeve (10) is installed on the outer ring of the rolling bearing (7), and can move along the shaft move in a straight line; the linear bearing (11) is installed on the optical shaft sleeve (10), which allows the optical shaft sleeve (10) to move linearly in the axial direction, and itself neither moves in the axial direction nor rotates; the linear bearing (11) It is connected with the inner cylinder (6) of the magnetorheological fluid damper, and the outer cylinder (14) of the damper is fixedly connected with the bracket (27) or the foundation, between the inner cylinder (6) and the end cover (13) and the outer cylinder (14) It is sealed by the O-ring (28); the outer cylinder (14) and the end cover (13) are fastened and connected by the screws (1) in the circumferential direction of the end; the circumferential position of the end cover (13) is provided with a positioning sleeve The cylinder (3), the positioning sleeve (3) is a double-layer hollow structure, the coil winding cylinder (12) is installed on the outside, and the magneto-rheological fluid damper inner cylinder (6) is installed on the inside; the positioning sleeve (3 ) in the double-layer hollow structure evenly interlaced with dynamic shear plates (5) and static shear plates (4), the dynamic shear plates (5) are arranged on the side close to the inner cylinder (6), and the static shear plates ( 4) Arranged on the side close to the coil winding barrel (12); when the valve stem (8) vibrates, the vibration is transmitted to the damper inner cylinder (6) through such a vibration transmission clip that can ensure the free spiral movement of the valve stem 12, Then drive the moving shear piece (5) to perform shearing motion in the magnetorheological fluid (17), generate damping force, consume the vibration energy of the valve stem (8), thereby reducing the amplitude of the valve stem (8) and reducing noise . 2. A variable damping vibration reduction and noise reduction device for valves according to claim 1, characterized in that: when the device is installed on the optical axis valve stem, the device mainly includes a vibration transmission clip and a magneto-rheological fluid Damper; the vibration transmission clip is composed of optical bushing (16) and linear bearing (11); the magnetorheological fluid damper is composed of threaded bushing (9), rolling bearing (7), optical bushing (10) and linear bearing ( 11) composition; the optical shaft sleeve (16) is installed on the optical shaft valve stem (15), and performs axial reciprocating linear motion with the valve stem (15); the linear bearing (11) is installed on the optical shaft sleeve (16), allowing The optical shaft sleeve (16) and the valve stem (15) reciprocate linearly, and the outer ring itself does not move; the linear bearing is connected to the inner cylinder (6) of the magnetorheological fluid damper, and the outer cylinder (14) of the damper is connected to the bracket (27) Or the foundation is fixedly connected; when the valve stem (15) vibrates, the vibration is transmitted to the damper inner cylinder (6) through such a vibration transmission clip that can ensure the reciprocating linear motion of the valve stem 14, driving the moving shear piece (5) in the The magneto-rheological fluid (17) performs shearing motion to generate damping force and consume the vibration energy of the valve stem (15), thereby reducing the amplitude of the valve stem (15) and achieving the purpose of vibration reduction and noise reduction. 3. A variable damping and noise reduction device for valves according to claim 1, wherein the control system of the variable damping and noise reduction device mainly includes a variable damping device, a real-time vibration acquisition and analysis system and a vibration control system. system; wherein the real-time vibration acquisition system mainly includes a vibration sensor (18), a signal conditioning module (20) and a data acquisition card (21); the vibration control system includes a computer (22), an analog output module (23) and an adjustable DC power supply ( 25); the vibration sensor (18) is installed on the bonnet flange and the valve stem to collect the vibration of the valve system valve body and valve stem in real time, and obtains the vibration electric signal (19), which is rectified, filtered and amplified by the signal conditioning module (20) After entering the data acquisition card (21) and converting it into a digital signal, the calculation and analysis software of the computer (22) calculates and analyzes vibration parameters such as amplitude and frequency spectrum, and the control software adopts relevant The real-time control signal (23) obtained by the control algorithm is passed to the analog output module (24), converted into a control analog signal by digital-to-analog conversion, and passed to the adjustable DC power supply (25) for real-time adjustment input to the magnetorheological fluid damper coil ( 2) The current generates a controllable magnetic field to act on the magnetorheological fluid in the damper, changing the shear yield stress and viscosity-related parameters of the magnetorheological fluid, so as to obtain a controllable damping force, and consume and attenuate different amplitudes and frequencies The valve vibration under the condition forms an active closed-loop control system of a real-time online continuous variable damping device, which realizes the vibration and noise reduction of the variable working condition and variable opening of the valve. 4. A variable damping vibration reduction and noise reduction device for valves according to claim 3, characterized in that: the control algorithm is a servo control algorithm, a segmented control algorithm or a PID control algorithm.