CN205426490U - Governing valve viscous characteristic analyzed experiment device - Google Patents

Abstract

The utility model provides a governing valve viscous characteristic analyzed experiment device mainly comprises governing valve, frictional force simulation part, controller, process object, process variable sensor and data collection station. The adjustable not frictional force movement characteristic of equidimension that produces of parts is simulated to frictional force, and the dynamic friction piece that it contained is connected through the valve rod of a rigid connection spare and governing valve, is equivalent to on outside frictional force stack and the valve rod to the viscous characteristic of simulation governing valve. The utility model provides a controller output signal, valve position sigual, process variable value and dynamic friction piece receive the normal pressure value all to be gathered and saved by data collection station, can study the detection method and the control compensation method of governing valve viscous characteristic based on these data.

Description

An experimental device for analyzing the viscous characteristics of a regulating valve

technical field

The utility model relates to an experimental platform for characteristic analysis of process control equipment, in particular to an experimental device for analyzing the viscosity characteristic of a regulating valve.

Background technique

Control valves are the most commonly used actuators in industrial processes. Faults such as dead zone, stickiness, hysteresis, and saturation often occur during use. The dead zone and saturation characteristics are easy to detect, and the probability of their occurrence is not high as long as the selection is reasonable in practice. Viscous characteristics are the most common, with varying degrees of influence on the control loop, and its detection methods are complex. In the initial stage of use of the control valve, the friction between the valve stem and the sealing part is within a reasonable range, so a linear relationship is maintained between the control signal input to the valve and the actual position of the valve. However, over time, the lubricating decay of the sealing parts, combined with the erosion of the external environment may cause the friction of the valve stem surface to increase, these phenomena lead to the sticky characteristic of the valve. A control valve with viscous characteristics will degrade the performance of the control loop where it is located, resulting in process variable oscillations, which will ultimately affect the product quality of the entire production line, increase the product failure rate, and increase energy consumption. In a modern factory, there are usually hundreds of regulating valves in operation, and it is a very heavy work to rely on manpower to detect and maintain each regulating valve. Therefore, using the available process data, the detection and compensation of valve viscous characteristics based on data-driven methods has always been an important content in the process control field. The premise of studying the influence of viscous characteristics on the control loop is to obtain various working data of the control loop in the viscous state. At present, one method of obtaining data is to collect data from actual industrial sites. The disadvantage is that the obtained data is uncontrollable and most of them need further processing. The second method is to change the installation torque of the regulating valve seal to make it in a viscous state, but this method will cause damage to the valve, and it cannot controllably output the working data under different viscous states.

Utility model content

The utility model provides an experimental device for analyzing the viscosity characteristic of a regulating valve. An external friction simulation part is installed on the regulating valve to simulate the friction characteristic of the valve rod to produce different valve viscosity states. The device can continuously adjust the viscosity level without changing the structure of the valve body. The device also includes a controller and a data acquisition system, which can generate control signals for the valve, and can collect and record the valve input signal, position signal, friction force and various process variables. The device can be used as an experimental platform to conduct research on viscous characteristic diagnosis and control compensation of regulating valves.

In order to solve the above problems, the utility model adopts the following scheme:

An experimental device for viscous characteristic analysis of a regulating valve, characterized in that the device includes a dynamic regulating valve, a friction simulation component, a controller, a process object, a variable sensor and a data collector, and the friction simulation component passes through a rigid connection It is connected to the stem of the valve, and the rigid connector is connected to the dynamic friction block. The dynamic friction block is subjected to the positive pressure exerted by the static friction block. Different pressures produce different friction forces, so that different friction characteristics are produced on the valve stem. To simulate the different viscous states of the control valve, the controller is connected to the control valve, and its output signal is used as the input signal of the control valve, and the control valve is connected to the process object. Different output of the control valve makes the process variable of the process object produce different values. The variable sensor detects the magnitude of the process variable value and sends it to the controller and the data collector at the same time. The data collector also collects the output signal of the controller, the valve position signal and the positive pressure value on the dynamic friction block.

As a further improvement on the above scheme:

The friction simulation part is composed of the moving part of the dynamic friction block and the pressure adjustment part of the static friction block. A rigid connector is fixed on the dynamic friction block, and the other end of the rigid connector is coupled to the valve stem of the regulating valve. The movement of the valve stem makes the dynamic friction The blocks move in the same direction, and the positive pressure of the static friction block on the dynamic friction block is adjustable. This force is applied to the side of the dynamic friction block, that is to say, the gravity of the static friction block is not applied on the dynamic friction block.

The moving part of the dynamic friction block in the friction simulation part is composed of a dynamic friction block, rigid connectors, couplings, coaxial connectors, sliding shafts, bearings, test joints, traction lines, pulleys and gravity compensation components.

The static friction block pressure adjustment part in the friction simulation part consists of an adjustment knob, a precision screw, a precision nut, an anti-displacement fixing piece, a bracket, an upper pressure piece, an elastic element, a pressure sensor, a static friction block fixing piece, a clamping screw, and a static friction block constitute.

The gravity compensator is connected with the test joint through the pulley, which can counteract the gravity of the dynamic friction block itself and its related connecting parts when it is installed vertically.

The valve stem of the regulating valve connected by the rigid connector and the dynamic friction block move synchronously, parallel to each other, and there is no dead zone and deformation between the two.

The pressure adjustment part of the static friction block in the friction simulation part converts the rotary motion into linear motion, and then transmits the force to the dynamic friction block through an elastic element.

The threads of the precision screw rod and the precision nut are very fine and uniform, and the elastic force range of the elastic element is completely within the corresponding range of the friction force on the valve stem of the regulating valve required for the experiment. After the static friction block is installed, no displacement will occur in the moving direction of the dynamic friction block.

The technical effect of the utility model is:

An experimental device for analyzing the viscous characteristics of a regulating valve needs to install the dynamic friction block and the valve stem of the regulating valve in parallel, and connect the connecting piece of the valve with the rigid connecting piece on the dynamic friction block through a coupling piece. When the valve stem of the regulating valve When moving, the moving friction block also does the same movement thereupon. When the adjustment knob is at a certain position, the positive pressure exerted by the static friction block on the dynamic friction block can be detected by the pressure sensor, and then according to the material characteristics of the dynamic friction block and the static friction block, the sliding friction coefficient and the maximum static friction coefficient can be known (also can be obtained by friction Force tester), so the friction motion characteristics of the dynamic friction block are known. According to the force superposition theorem, this friction characteristic is also exerted on the valve stem of the regulating valve, so it can simulate the motion characteristics of the valve when it is viscous.

Description of drawings

Fig. 1 is a schematic diagram of the main structure of the utility model.

Fig. 2 is a structural diagram of the friction simulation component of the present invention.

In the figure: 1. Push rod; 2. Connecting piece; 3. Valve stem; 4. Gland; 5. Adjusting screw; 6. Seal; 7. Valve core; 8. Dynamic friction block; 9. Static friction block; 10. Coaxial connector; 11, bearing; 12, sliding shaft; 13, fixing screw; 14, rigid connector; 15, pressure sensor; 16, elastic element; 17, precision screw; 18, adjustment knob; 19, anti-displacement Fastener; 20, static friction block fixing piece; 21, fixed rod; 22, pulley; 23, traction line; 24, gravity compensation piece; 25, precision nut; 26, bracket; 27, upper pressure piece; 28, clamping Screw; 29, coupling piece; 30, test connector; 102, regulating valve; 101, controller; 103, process object; 104, friction simulation component; 105, data collector; 106, variable sensor.

detailed description

Below in conjunction with accompanying drawing, the specific embodiment of the present utility model will be further described.

As shown in Fig. 1 and Fig. 2, a control valve viscous characteristic analysis experimental device of this embodiment includes a dynamic control valve 102, a friction simulation component 104, a controller 101, a process object 103, and a variable sensor 106 and the data collector 105, the friction simulation part 104 is connected with the valve stem 3 of the valve through a rigid connector 14, and the rigid connector 14 is connected with the dynamic friction block 8, and the dynamic friction block 8 is subjected to the positive pressure exerted by the static friction block 9, Different pressures produce different friction forces, so that different friction characteristics are produced on the valve stem 3 to simulate different viscous states of the control valve 102. The controller 101 is connected to the control valve 102, and its output signal is used as the control valve 102. The input signal, the regulating valve 102 is connected to the process object 103, and the output of different regulating valves 102 makes the process variable of the process object 103 produce different values. The variable sensor 106 detects the value of the process variable and sends it to the controller 101 and data at the same time. The collector 105 and the data collector 105 also collect the output signal of the controller, the valve position signal and the positive pressure value on the dynamic friction block 8 at the same time.

In the present utility model, as shown in Figure 2, the friction simulation part 104 is composed of the moving part of the dynamic friction block 8 and the pressure adjustment part of the static friction block 9, the dynamic friction block 8 is fixed with a rigid connector 14, and the other end of the rigid connector 14 is coupled Connected to the valve stem 3 of the regulating valve 102, the lower end of the valve stem 3 has a valve core 7, and the upper end is equipped with a push rod 1; the movement of the valve stem 3 makes the dynamic friction block 8 move in the same direction, and the static friction block 9 is opposite to the dynamic friction block 8. The positive pressure is adjustable, and this force is applied to the side of the dynamic friction block 8 , that is to say the gravity of the static friction block 9 is not applied on the dynamic friction block 8 .

In the present utility model, as shown in Figure 2, the moving part of the dynamic friction block 8 in the friction force simulation part 104 is composed of a dynamic friction block 8, a rigid connector 14, a coupling 29, a coaxial connector, a sliding shaft 12, a bearing 11, The test joint 30, the pulling wire 23, the pulley 22 and the gravity compensator 24 constitute.

In the utility model, as shown in Figure 2, the static friction block 9 pressure adjustment part in the friction force simulation part 104 is composed of an adjustment knob 18, a precision screw rod 17, a precision nut 25, an anti-displacement fixing piece, a bracket 26, and an upper pressure piece 27. , Elastic element 16, pressure sensor 15, static friction block 9 fixing parts, clamping screw 28 and static friction block 9 constitute. The gravity compensator 24 is connected with the test joint 30 through the pulley 22, and can counteract the gravity of the dynamic friction block 8 itself and its associated connecting piece 2 when it is installed vertically. The valve stem 3 of the regulating valve connected with the rigid connecting piece 14 and the dynamic friction block 8 move synchronously, parallel to each other, and there is no dead zone and deformation between the two. The pressure adjustment part of the static friction block 9 in the friction simulation part 104 converts the rotational motion into a linear motion, and then transmits the force to the dynamic friction block 8 through an elastic element 16 . The threads of the precision screw rod 17 and the precision nut 25 are very fine and uniform, and the elastic force range of the elastic element 16 is completely within the corresponding range of the frictional force of the regulating valve stem 3 required by the experiment. After the static friction block 9 is installed, no displacement will occur in the moving direction of the dynamic friction block 8 .

As shown in Figure 2, the surfaces of the static friction block 9 and the dynamic friction block 8 in the friction simulation component 104 have a certain level of roughness, and different friction dynamic characteristics can be simulated by replacing friction blocks with different roughness levels. In an exemplary embodiment of the present utility model, the static friction block 9 may choose the same surface material as the valve seal 6 , and the dynamic friction block 8 may choose the same surface material as the valve stem 3 .

In the utility model, the bearing 11 can be a linear bearing, and the sliding friction force between the sliding shaft 12 and the bearing 11 is very small, which is negligible compared to the friction force between the dynamic friction block 8 and the static friction block 9, and this force can also be adjusted by fine-tuning the gravity compensator 24 for quality compensation.

In the present invention, the friction simulation part 104 can be installed on the bracket 26 of the regulating valve 102 as a whole, and the installation position should be carefully adjusted to ensure that the dynamic friction block 8 and the valve stem 3 are strictly parallel during operation.

In the utility model, under the proper adjustment of the adjusting screw 5, the gland 4 of the regulating valve 102 can be considered to have a stable friction characteristic of the valve stem 3 and the sealing member 6; The displacement maintains a linear relationship; for the old control valve that has been used, after installing the friction simulation part 104, adjust the positive pressure of the static friction block 9 against the dynamic friction block 8 to be zero, and then connect a friction tester to the test joint 30, To measure the initial viscous state of the control valve.

When working, the dynamic friction block 8 and the static friction block 9 are in close contact, and the positive pressure of the static friction block 9 on the dynamic friction block 8 can be detected by the pressure sensor 15; Both ends are provided with test joints 30; two sliding shafts 12 are installed on the bearings 11 respectively, and the frictional force when the sliding shafts 12 slide in the bearings 11 is very small; the dynamic friction block 8 is also connected by a fixing screw 13 and a rigid connector 14, The other end of the rigid connecting piece 14 is connected to the coupling piece 29, and the coupling piece 29 is installed on the connecting piece 2 of the regulating valve, and the connecting piece 2 is connected with the valve stem 3. When the valve stem 3 moves, it drives the dynamic friction block 8 to move, and the dynamic friction The frictional force suffered by the block 8 is also applied on the valve stem 3; the installation direction of the dynamic friction block 8 will be parallel to the valve stem 3, which can be vertical or horizontal. During the vertical direction, the dynamic friction block 8, coaxial The gravity of the connector 10, the sliding shaft 12, the fixing screw 13, the rigid connecting piece 14 and the coupling piece 29 is offset by the gravity compensating piece 24, and the gravity compensating piece 24 is connected to the test joint 30 through the pulling wire 23 and the pulley 22 ; When the dynamic friction block 8 is installed horizontally, the traction line 23 and the gravity compensator 24 need not be installed.

In the present utility model, as shown in Figure 2, the static friction block 9 exerts positive pressure on the dynamic friction block 8 to adjust through the adjustment knob 18, the adjustment knob 18 is connected to the precision screw rod 17, and the precision screw rod 17 is installed on the bracket fixed on the support 26. In the precision nut 25, when the adjustment knob 18 is turned, the rotary motion of the precision screw rod 17 is converted into a linear motion, thereby pushing the upper pressure piece 27 to move, the other side of the upper pressure piece 27 is connected to the elastic element 16, and the other side of the elastic element 16 is connected to the The pressure sensor 15 and the linear movement of the upper pressure member 27 make the elastic element 16 deform, thereby generating elastic force, which is also applied to the pressure sensor 15; after the adjustment knob 18 is adjusted in place, the anti-displacement fastener 19 can be further fixed to prevent The precision screw 17 fluctuates; the pressure sensor 15 is connected with the static friction block fixing part 20, and the static friction block fixing part 20 is connected with the static friction block 9, and the elastic force generated by the elastic element 16 is finally applied to the static friction block 9, and then transmitted to Generate positive pressure on the dynamic friction block 8; the static friction block 9 is firmly fixed in the static friction block fixing part 20 by the clamping screw 28, and it will not be displaced when the dynamic friction block 8 moves; the static friction block fixing part 20 is also fixed by The rod 21 is connected to the bracket 26, and the fixed rod 21 can slide in the mounting hole of the bracket 26. Turning the adjustment knob 18 in different directions can make the static friction block fixing part 20 approach or move away from the dynamic friction block 8, thereby increasing or reducing the dynamic friction of the static friction block 9 Block 8 positive pressure.

The above-mentioned embodiments are preferred implementation modes of the present utility model, which are only used to facilitate the description of the present utility model, and are not intended to limit the present utility model in any form. Anyone with ordinary knowledge in the technical field, if they do not depart from this utility model Within the scope of the technical features mentioned in the utility model, the equivalent embodiments that make partial changes or modifications using the technical content disclosed in the utility model, and do not deviate from the technical features of the utility model, still belong to the technical features of the utility model within range.

Claims (9)

1. null1. a regulation valve viscosity property analyzes experimental provision，It is characterized in that: described device includes dynamic regulation valve、Frictional force analog component、Controller、Process object、Rate-of-change sensor and data acquisition unit，Frictional force analog component is connected by the valve rod of a rigid connector and valve，Rigid connector is connected with dynamic friction block again，The normal pressure that it is applied by dynamic friction block by static friction block，The frictional force that different pressure outputs is different，So that producing different friction characteristics on valve rod，Different viscous states with analog regulation valve，Controller connects regulation valve，Its output signal is as the input signal of regulation valve，Regulation valve connection procedure object again，Different regulation valve output，The process variable making process object produces different values，The size of rate-of-change sensor detection process variable value，And it is simultaneously sent to controller and data acquisition unit，The output signal of data acquisition unit acquisition controller also simultaneously、Positive pressure value on valve position signal and dynamic friction block.
2. 2. a kind of regulation valve viscosity property as claimed in claim 1 analyzes experimental provision, it is characterized in that: described frictional force analog component is grouped into by dynamic friction block movable part and static friction block pressure regulating part, it is fixed with rigid connector on dynamic friction block, the other end of rigid connector is coupled to regulate on the valve rod of valve, stem movement makes dynamic friction block move in the same direction, static friction block is adjustable to the normal pressure of dynamic friction block, this power puts on the side of dynamic friction block, say, that the gravity of static friction block is not applied on dynamic friction block.
3. 3. a kind of regulation valve viscosity property as claimed in claim 1 analyzes experimental provision, it is characterised in that: the dynamic friction block movable part in frictional force analog component is made up of dynamic friction block, rigid connector, coupling, coaxial connector, sliding axle, bearing, test splice, draught line, pulley and gravity compensation part.
4. 4. regulation valve viscosity property as claimed in claim 1 a kind of analyzes experimental provision, it is characterised in that: the static friction block pressure regulating part in frictional force analog component divides and is made up of adjusting knob, accurate lead screw, accurate nut, anti-displacement fixture, support, upward pressure part, flexible member, pressure transducer, static friction block fixture, clamping screw and static friction block.
5. 5. regulation valve viscosity property as claimed in claim 1 a kind of analyzes experimental provision, it is characterised in that: gravity compensation part is connected by pulley and test splice, can offset dynamic friction block vertically-mounted time itself and the gravity of its related fittings.
6. 6. a kind of regulation valve viscosity property as claimed in claim 1 analyzes experimental provision, it is characterised in that: regulating valve rod and dynamic friction block after rigid connector connection are synchronized with the movement, parallel to each other, and the most there is not dead band and deformation.
7. 7. a kind of regulation valve viscosity property as claimed in claim 1 analyzes experimental provision, it is characterized in that: the static friction block pressure regulating part in frictional force analog component divides rotary motion is changed into linear running, then power is transmitted to above dynamic friction block by a flexible member.
8. 8. regulation valve viscosity property as claimed in claim 1 a kind of analyzes experimental provision, it is characterised in that: within the scope of the correspondence of the elastic force scope of flexible member regulating valve rod friction needed for experiment completely.
9. 9. a kind of regulation valve viscosity property as claimed in claim 1 analyzes experimental provision, it is characterised in that: static friction block will not produce displacement after installing in the direction of motion of dynamic friction block.