The hottest Shanghai Mingjing configuration intell

2022-09-22
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Shanghai Mingjing configuration intelligent electronic variable frequency electric control valve at present, Shanghai Mingjing anti-corrosion Valve Manufacturing Co., Ltd. is an enterprise producing configuration intelligent variable frequency electric actuator and configuration intelligent variable frequency electric control valve with independent property rights. Product model: qzdlp series configuration intelligent electronic variable frequency electric regulating valve. It is a new type of actuator and advanced control. At present, Shanghai Mingjing anti-corrosion Valve Manufacturing Co., Ltd. is an enterprise producing configuration intelligent variable frequency electric actuator and configuration intelligent variable frequency electric regulating valve with independent property rights. Product model: qzdlp series configuration intelligent electronic variable frequency electric regulating valve. It is a new type of actuator, which is the product of the combination of advanced control system and traditional mechanical transmission. It can meet the requirements of automatic regulation system for actuator. After the configuration intelligent variable frequency electric regulating valve is adopted, the operating speed of the valve core changes during the regulation process. When the deviation between the input signal and the valve position feedback signal is large, the motor runs faster than the ordinary electric regulating valve, and the faster the tracking effect is. However, as the deviation between the input signal and the feedback signal decreases, the speed of the valve motor will slow down, and the movement speed of the valve

core will also decrease. The closer to the balance point, the slower the motor speed will be. The valve will open or close little by little near the balance point, which has a strong fine-tuning effect, and the result is to greatly improve the control accuracy of the valve. At the same time, the variable speed regulation of the configuration intelligent variable frequency regulating valve in the regulation process will also reduce the overshoot and the dynamic oscillation will also decrease significantly. The contradiction between the sensitivity and stability of the electric control valve has been satisfactorily solved. Moreover, the frequency converter has the motor soft start function, and the valve motor will not have impulse current every time it is started. Moreover, the valve motor is also changed from single-phase motor to three-phase motor, the current of each phase decreases, and the reliability of the motor is improved. The service life of the valve motor will be greatly extended. At the same time, the configuration intelligent variable-frequency electric actuator takes the high-precision and long-life conductive plastic potentiometer as the position sensing element, and applies the mechanical and electrical limit devices, which significantly improves the reliability and safety of the configuration intelligent variable-frequency electric control valve. Shanghai Mingjing can effectively prevent the valve stem from bending when the control valve is closed

configuration type intelligent variable frequency electric actuator and regulating valve. Parameter configuration design adopts jumper free design, which can basically meet the needs of various occasions

in a word, making the servo motor of the electric actuator work in the state of frequency conversion and speed regulation can fully express many process occasions requiring the operation speed of the electric actuator to change. The soft starting mode of the frequency converter reduces the starting current of the servo motor by 6 times, greatly reduces the starting impact on the electricity and its own mechanical structure, and allows more than 1000 starts with load per hour. Energy consumption braking is generated by electric braking, eliminating the mechanical braking device. Configuration type intelligent variable-frequency electric actuator and regulating valve have configuration, intelligence, variable-frequency and variable-speed functions, and many common electric regulating valves have achieved good regulation results where the application effect is poor. Main applications:

1. The system requires high control quality and small static error

in chemical industry, petroleum, metallurgy, light industry, building materials, and power industry, many automatic control systems require very high control accuracy, so electric control valves are required to have high sensitivity and small dead zone. Because the ordinary electric control valve has no fine-tuning function of low-speed operation, the only way to eliminate the system static error is to maintain the system static error index by frequent positive and negative "inching" actions of the control valve near the given value. In this way, the oscillation of the system is easily caused by the idling and inertia of the regulating valve. The configuration intelligent variable frequency regulating valve operates at a low speed near the given value, and this problem can be well solved by overcoming the static error of the system through fine-tuning

2. Occasions where the object time constant is small and the regulating valve oscillates

for the pressure, flow, liquid level and other self-adjusting systems with small object time constant, the regulating valve will act frequently during the regulation process, the starting current is very large, and the motor is often overheated. To solve this problem, we can only increase the dead zone, but the adjustment quality will deteriorate. Configuration type intelligent configuration type intelligent variable frequency regulating valve has soft start function, and the soft start time can be adjusted. In fact, it is equivalent to adding a buffer to the regulating valve to slow down the action of the regulating valve, greatly reduce the starting current, and greatly reduce the vibration caused by the frequent action of the regulating valve to the system

3. Where the diameter selection of the regulating valve is too large

the diameter selection of the regulating valve is too large, so that the working area of the regulating valve is within the small opening range, and the regulating effect is deteriorated or oscillates and cannot work. Using the configuration intelligent variable frequency regulating valve can reduce the operating speed of the regulating valve, set the upper limit working point of the regulating valve, and change the flow characteristic to the proportional characteristic at the same time, which can generally better solve the problem of selecting a large diameter of the regulating valve. For example, when a DN50 valve is actually selected, DN80 valve is selected, and the result is that the valve is adjusted between 0~40%. Now set the upper limit of the valve to 40% and the maximum working speed of the valve to 60%, so that the regulating valve will not be opened up after the opening reaches 40% in the regulation process, avoiding overshoot. The motion speed of the variable-frequency valve also slows down, and the fine-tuning effect is strengthened, and its effect will be roughly the same as that of the Dg50 regulating valve

4. Where the flow characteristics are selected incorrectly

there are many changes in the flow characteristics of the control valve on site, most of which are caused by the low S value caused by the process piping. The configuration intelligent variable frequency regulating valve has three flow characteristics, which can be easily changed through parameter setting. For example, a linear valve should be changed to a valve with equal characteristics due to the system s value of 0.7. At this time, Shanghai Mingjing can change the linear flow characteristic into the equal percentage flow characteristic through parameter setting

5. When it is difficult to determine the opening and closing form of the regulating valve

the electric opening and closing form of the configuration intelligent variable frequency regulating valve is realized by parameter setting. When the process needs to change the action mode of the regulating valve, Shanghai Mingjing can change the action mode of the regulating valve in the form of electric opening to the regulating valve in the form of electric closing through program setting. Therefore, it is difficult to determine the function mode of the control valve in the process at the moment by using renewable soybean oil as the replacement of 25% oil. It is very convenient to select the configuration intelligent configuration intelligent variable frequency control valve. In addition, after the action mode of the configuration intelligent variable frequency regulating valve is changed, if the feedback signal direction of the valve also needs to be changed, it can also be achieved through the parameter setting method

6. The process requires that a certain flow rate should be reserved for the operation of the regulating valve

some processes require that the regulating valve cannot be fully closed during the regulation process, and the regulating valve is required to be fully closed during the non regulation process. At this time, set the lower limit of the configuration intelligent variable frequency regulating valve. When the input signal is lower than the lower limit signal, the valve position will automatically stop at the lower limit and no longer act. Ensure that the valve has a certain flow. When it is necessary to close the valve in some cases, the small signal removal function can be used to short-circuit the CV control signal to close all the regulating valves

7. High precision positioning occasions

occasions with measurement requirements, pass within ± 1% of the set value 19. Overall dimension of the experimental machine: 695 × five hundred and eighty × 1915mm20. Power supply: 220v/50hz regulating valve strictly controls the pipeline flow. Because the transition process of the configuration intelligent variable frequency regulating valve is slow (soft start) first, then fast (rapidly approaching the set value) and then slow (slow down when the valve position is close to the set point). When the set point is reached, the operation speed of the regulating valve has been very slow. Coupled with the electric braking function, the configuration intelligent variable frequency regulating valve has high positioning accuracy and there is no overshoot. Therefore, as a measurement The material control of feeding and other links is very effective

8. Where split range regulation is adopted

the input signal of the configured intelligent variable frequency regulating valve can be set arbitrarily between 4~20ma, so it is very convenient to realize split range regulation

9. Occasions where servo motors and braking devices often fail

the samples of electric control valve motors and braking devices often need to be quenched. The occasions where failures occur are all because the electric control valve starts and stops more than 10 times per minute, and acts frequently. In this case, it should be considered to replace the configuration type intelligent variable frequency regulating valve. The configuration type intelligent variable frequency regulating valve has forward and reverse transformation delay and in-phase secondary action time interval control, so it will not cause frequent oscillation of the regulating valve and motor overheating. There is no mechanical braking mechanism in the configuration intelligent variable frequency regulating valve, so there will be no failure of braking machinery

in a word, the selection of regulating valve is a very important part in the design of automatic regulation system. Because there are many uncertain factors in the design and selection, there are often problems in the selection. Shanghai Mingjing through the above analysis, the use of configuration intelligent variable frequency control valve will make the selection of control valve relatively simplified

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