Electric control valve is the product of the development of industrial automation. Its actuator has been widely used in industrial pipelines and fluid control and other industrial occasions.
With the development of industrial automation in China, the market has strict requirements on the response speed and accuracy of valve opening and closing procedures. Strengthening the performance of executing agencies and optimizing the design of control systems have become the top priority for the development of control valve industry. Firstly, starting from the design of the whole system of the electric control valve, the main points of the structure of each part are described in detail, and the design requirements of the valve control system are summarized, which is devoted to the optimal design of the actuator controller. The actuator of the valve is very important in the whole control system, and it is an important component of the equipment. According to the energy supply situation of the executing agency, it can be divided into three types: pneumatic, hydraulic and electric.
The electric type is gradually recognized by the market for its advantages of high accuracy and flexible control. Today, with the rapid development of intelligent technology, valve controllers are becoming more intelligent, and electric control systems are gradually realizing new development. For a long time, there is still a certain gap between domestic and foreign products in the use performance of valves, and domestic products are in a weak position in the market competition. In recent years, driven by the concept of home-made, the valve industry in China has developed rapidly, its overall performance has gradually improved, and the gap with foreign advanced production technology has been narrowing. The actuator is the key device to control the electric control valve.
According to the needs of different users, the executive controller can be divided into different modes according to its nature. The local mode of controlling valve operation is truthfully controlled. The valve is controlled by buttons. There are two control modes: maintenance button operation and impulse type. There are also remote mode of remote operation of the executive mechanism, which has the “on-off mode” of simply controlling valve opening and closing. In the case of communication, the control can be realized, and the “analog quantity” model which can accurately control the opening and closing degree of the valve is widely used in the market. According to the current market requirements for valve performance, optimizing the design of its execution system should start from two aspects. First, the design of hardware system is optimized. Its basic structure and module settings are shown in Figure 1. From the design drawings, it can be seen that the core part of the whole architecture of the system is the control module, which is the key to maintain the normal operation of the system and to process the data of the whole system. The module is the core component of the valve controller, which is closely connected with the circuit of other parts, and is also a strong guarantee for the operation and work of the actuator. The optimum design of valve system should also take into account the overall software function, continuously improve the ability of the controller to process all kinds of input signals, and strengthen the design of intelligent self-inspection. The actuator of the valve is to open and close the valve according to the transmission signal of the system, so as to realize the control of the medium flow in the corresponding pipeline. The specific working principle of the actuator is shown in Fig. 2.
It is shown from the schematic diagram that the actuator is mainly composed of a controller (whose function is to change the execution commands conveyed by the system and operate the motor precisely) and an actuator (whose function is to drive the valve according to the relevant control commands). As can be seen from Fig. 2, the actuator returns the package. Including the work of feedback detection part, the purpose is to check the accuracy of the system operation, and to deal with the operation problems in time. The actuator in the diagram mainly includes motor equipment, system transmission equipment, switching settings and final feedback detection. The controller includes CPU, interface module, power supply equipment and signal conversion processing module. These two major parts are the most important parts to realize system optimization.
The design of the controller also starts with the optimization of hardware and software, including the enhancement of the performance of each module and the optimization of the parameters of each part of the software. Hardware requirements for valve system. Firstly, the core control module minimizes the design of the circuit unit and allocates its peripheral resources reasonably.
In the design of detection system, to ensure its stability and achieve closed-loop control of the system, it is necessary to provide high-quality hardware accessories for circuit design, including precise valve position control and timely feedback detection. The design of interface module ensures the transmission of communication signal and enhances the effect of switching quantity in information transmission and reception. In addition, the optimization of analog signals in the upper control signal is planned, and the communication circuit with strong anti-jamming ability is selected to prevent the upper sending signal from being affected in the transmission process. Finally, the design of human-computer interaction, which involves the operation and setting of the relevant parameters of the valve system, is an important part of ensuring user’s convenient operation. According to the different atmosphere of control mode, local control and remote control are two ways.
In addition, the valve system should be optimized from the aspects of LED indicator, power supply and motor drive. Software requirements of the controller. At present, the common operating system of electric control valves is embedded. Specific optimization should proceed from several directions, such as the environment of software development, the design of frame structure, the design of driver-related software and human-computer interaction, constantly refine the software program design, optimize the operation parameters of each module, thermostatic element and make sure that it is practical.
Combining the international demand with the popular operation technology in the market, we can deal with it comprehensively. Aiming at the design optimization problems faced in the development of valve industry, this paper firstly analyses the whole system of electric control, points out the direction of actuator optimization and the specific requirements of program accessories, and takes the specific optimization direction as the guidance, devotes itself to improving the control performance of different modules of the system. With the advancement of industrial automation, the performance of electric control valves in the control system needs to be optimized urgently, and their control mode has gradually been developed completely, and the signal transmission of interface module has also appeared diversified ways.