With the rapid development of power electronic technology and the automatic control valve industry, electric valve actuator develops rapidly. Computer technology, and microcomputer control technology has been widely used in the design of automatic control valves. These intelligent electric valve actuators are powerful, simple and reliable, advanced technology, the following introduction of Electric Valve actuator development trends.
The rapid development of computer technology and communication technology has accelerated the development of electric valve actuators, the split structure will replace the mechatronics engineering; control accuracy will be higher, the use of more extensive environment; more powerful, more reliable, in order to adapt to the development of automatic control requirements.
Automation technology has developed rapidly in the last decade, and electric valve actuators, as one of the automation instruments in automatic control, have adapted to this trend It should also have a standard serial communication interface and a dedicated LAN interface to enhance its interconnectivity with other control devices, requiring only one cable or fiber optic cable Several, even hundreds of electric valve actuators can be connected with the upper computer into the whole CNC system. Fieldbus is a serial, digital, multi-point communication data bus between field equipment/instrument and automatic control device / system in the control room. As the development direction of control systems in the future, the combination of fieldbus enterprise network and Internet is possible because of its openness and networking, and the application of fieldbus technology to electric actuator is inevitable. The application of fieldbus technology replaces the traditional 4 ~ 20mA analog signal, realizes the remote monitoring of electric actuator, transmits the status, fault and parameter information, completes the remote parameterization work, and improves its reliability reduced system and engineering costs. At present, intelligent electric actuators abroad generally have fieldbus interface, China has also developed some intelligent actuators with Fieldbus interfaces.
Intelligentization is the current trend of all industrial control equipment and is also the development trend of electric valve actuators low-cost single-chip microcomputers and new high-speed microprocessor will replace analog electronic devices as the main control unit of Electric Valve actuators, thus achieving a fully digital control system. With the realization of full digital control, the original electric component control is changed into software control, so the advanced algorithm of modern control theory can be applied in electric valve actuator. Such as optimal control, artificial intelligence, fuzzy control, neural network to improve valve control performance. The traditional electric valve actuator is generally regarded as a linear system, which consists of amplifying and integrating parts. In fact, most of the valve actuator parameters change significantly during operation The application of parameter scheduling and model identification adaptive control will greatly improve the control performance of electric valve actuator. Compared with pneumatic and hydraulic valve actuators, the intelligent electric valve actuators with simple wiring, powerful functions and reliable use will continuously expand the application range.
The high integration of power electronics, the use of single-chip microcomputer and the use of multi-functional powerful integrated module make the electric valve actuator smaller and smaller, to the miniaturization, light development. At present, the intelligent electric valve actuator is installed in regulating valve, globe valve, gate valve, ball valve and butterfly valve, which integrates other control instrument controllers on site. The integration of the electric actuator simplifies the installation and debugging of the actuator, the whole control loop is installed in a field instrument, and the influence of leakage and interference in signal transmission on the system is reduced The reliability of the system is improved. The miniaturization of the electric valve actuator will greatly save the installation space and the difficulty of installation and is also beneficial to the centralized control of large-scale control instruments.
Post time: Jul-28-2021