Research on the variable control method of metal rotor
flowmeter Metal rotor flowmeter is an important component in the hydraulic system. It has the advantages of high rated pressure, high power density, convenient quantity control, etc. It is mainly used in hydraulic systems with high pressure, large flow and flow needs to be adjusted. It is an effective choice for the variable control mode of the rotameter, which is directly related to the performance of the metal rotameter. Reasonable variable control method of metal rotameter is beneficial to improve the performance of metal rotameter, and can play the function of the hydraulic system where the metal rotameter is located. The unreasonable variable control method is not only unfavorable to the performance of the metal rotor flowmeter, but also may make it a potential safety hazard, and some even cause damage to the metal rotor flowmeter. Therefore, the exploration of the variable control method of the metal rotameter is closely related to the performance of the metal rotameter and the reliable and stable operation of the hydraulic system. 1. Traditional variable control method The variable control method of metal rotor flowmeter has always been an important subject of research. The traditional variable control method also brings economic benefits. The traditional variable control methods include constant flow control, constant pressure control and constant power control. The three control methods respectively control the actual output flow, pressure excitation and power of the metal rotor flowmeter according to the comparison between the collected set signal and the output actual signal, under the characteristics of the three control methods. 2. Constant flow control Constant flow control needs to detect two kinds of signals during the application process, the flow setting signal and the output flow signal and pressure signal. During the operation of the metal rotameter, on the one hand, the digital controller determines the output flow of the metal rotameter according to the detected pressure output signal and flow output signal, and on the other hand, it will also input the set input flow of the metal rotameter. Compared with the actual flow rate of its output, the error signal of the input flow rate and the output flow rate is obtained, and the size of the control signal is effectively adjusted according to the obtained error signal. Therefore, under the adjustment action of the flow controller, the flow setting signal of the metal rotor flowmeter can be kept consistent with the actual output flow. 3. Constant pressure control During the working process, if the pressure is abnormal, the working performance of the metal rotameter will be seriously affected, and it will cause safety hazards to the hydraulic system where the metal rotameter is located. Therefore, constant pressure control is also widely used. Constant pressure control mainly detects two pressure values, the set pressure value and the feedback value of the load pressure. The pressure controller will compare the set pressure value with the load pressure, and according to the error results, the control algorithm determines the flow input set value of the flow controller and the flow output value of the pump, and the matching of the two ensures that the load pressure is equal to the flow rate of the pump. Set the pressure value uniform. 4. Constant power control Constant power control needs to detect the flow setting signal from the power controller and the actual output flow signal of the pump, and use the flow controller to compare the two signals to obtain the power control signal. Under the adjustment action of the power controller, it is ensured that the actual output power of the metal rotor flowmeter is consistent with its set signal. Constant power control can effectively avoid the failure caused by overload of metal rotor flowmeter.
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