1. Introduction of electric valve
s With the trend of electromechanical integration, as well as the development of microelectronics and computer technology, these electric valves have more and more problems in their use. For example, the control accuracy is not high, the on-site debugging is inconvenient, and the fault diagnosis method is not perfect. This makes the original electric valve more and more unable to meet the needs of modern industrial development and will be eliminated. Therefore, it is of great significance to effectively transform the electric valve, an important industrial mechanical product, to improve its intelligence, and to make its control process computerized, communication function digitized, fault diagnosis processing intelligent, and detection remote. . Second, the significance of the intelligent study of electric valves The actual valve position of the valve has only three positions: open, closed and intermediate position. The valve position is controlled by the output torque of the valve motor. At present, our country usually adopts the working mode that the travel switch controls the valve motor and the torque switch plays a protective role. However, travel switches and torque switches are usually installed on electric actuators, so the valve position signal cannot be obtained directly from the valve shaft, which makes the indicated value of the valve position only an approximate value, which results in the valve being not closed tightly or opened. . If the output torque is selected too small, it will be difficult to open and close the controlled valve, which is easy to be electric and burned; if the output torque is selected too large, once the control failure of the electric actuator is very easy to cause partial structural damage of the valve. Therefore, this control method cannot directly control the opening and closing and adjustment of the valve, and the control accuracy is relatively low. On the other hand, in this working mode, the long-term action of the straight-stroke stop valve and the gate presses the inner wall of the pipeline to form a micro groove, which will cause the valve to close tightly and cause leakage. Leakage is one of the sources of industrial pollution. The leakage of the valve will increase the consumption of the medium outflow, increase the cost, and decrease the economic benefits of the enterprise. The leakage of flammable, explosive, toxic and harmful media may cause accidents such as fire, explosion, poisoning, personal injury and death. The leakage of strong corrosive medium will accelerate the corrosion rate of plant and equipment and shorten the service life. Therefore, the existence of leakage seriously threatens safe production and even makes production impossible. Therefore, the problem of valve leakage cannot be ignored. For a long time, the solution to valve leakage has been from the valve. Optimize the design of valve structure, select materials for manufacturing valves reasonably according to different process conditions, improve the quality control level in the valve production process, and optimize valve selection according to various process conditions in the chemical production process. Although these methods have effectively eliminated the valve leakage problem, if you can start with the control method of changing the valve position and directly control the valve position, when the valve has a leakage problem, the valve position controlled by the valve motor can be controlled by the feedback amount of the control. Compensation to control the valve more effectively. At the same time, changing the control mode of the valve position is also to meet the needs of automated production. Third, the current status of the research on the intelligentization of electric valves 1. The current status of the research on the intelligentization of electric valves. Electric valves are composed of two parts, a valve and an electric actuator, but so far, the production of these two parts is still produced by different manufacturers. The lack of technical communication among various manufacturers only improves the quality of their own products while ignoring the 'complete set' of the two parts. In addition, although there are now sub-item technical standards for various types of valves and industry standards for electric actuators, there is no 'complete set' of electric valves or the standards are not uniform. All these have caused problems with the 'set' of electric valves, and lack of corresponding basis. On the other hand, as far as the structure of the electric valve is concerned, the structure of the valve is relatively simple, while the structure of the electric actuator is relatively complicated. Therefore, more and more people are turning their attention to electric actuators and are committed to improving their intelligent level. Ignoring the intelligence level of the valve itself makes the development of the intelligence level of the two unbalanced, and the intelligence level after the 'set' is not high. 2. Current status of intelligent research on electric actuators. In recent years, with the rapid development of microelectronics, computers, communication network technology and mechatronics technology, valve electric actuators have achieved rapid development. Some domestic and foreign manufacturers have successively introduced intelligent electric actuators that hinder the fieldbus communication protocol. These intelligent valve electric actuators adopt a microprocessor system, and all control functions can be realized through programming. At present, the international and domestic advanced intelligent valve electric actuator products mainly include: 2.1 IQ series intelligent electric actuators. The British ROTORK company launched an intelligent electric actuator (IQ series) in the 1990s. Compared with ordinary actuators, it has the following characteristics: (1) Convenient parameter remote setting function. Before putting it into use, as long as the special setting tool provided by the manufacturer is used, the parameters can be remotely set by aiming at the actuator. It not only simplifies the setting work procedures, but also improves the safe operation of the equipment, especially for those places where explosion-proof is required; (2) Rich online display functions. Adopting liquid crystal display technology, using built-in liquid crystal display panel, not only can accurately display valve opening and closing status and normal valve opening, etc., but also display important information when parameter settings or actuator failure; 2.2 ONTRAC MOE700 /MME800 series of intelligent electric actuators. This series of intelligent electric actuators was introduced and launched by the Hu0026amp Company of Germany (now part of ABB Group) at Chongqing Chuanyi No. 10 Factory.
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