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Abstract Electric device (electric actuator) is a mechatronic device that drives the valve to open and close to realize the function of the valve, which plays a key role in the reliable operation of the valve. The performance parameters of the electric device include torque, stroke, pitch, operating time, speed, stem diameter, and the like. This paper analyzes the quotation data of manufacturers in previous procurement projects, establishes mathematical models, and studies the main factors affecting the cost of electric devices.
Key words valve electric device performance parameter mathematical model price First, electric device function Typical electric device consists of motor, gear unit, hand wheel, switch and signal unit, plug and socket connection electrical connection, output shaft six parts. When the actuator receives the valve action signal, the motor starts, and the valve stem nut on the output shaft is driven by the two-stage deceleration (gear and worm) of the gear unit to drive the valve stem to realize the opening and closing function of the valve. In order to ensure the normal opening and closing function of the valve, the electric device mainly controls the torque and opening of the valve through the torque switch and the limit switch.
Second, the basic type of electric device classification electric device, can be divided into multi-turn, partial-rotation two drive modes. The multi-turn electric device is mainly used for driving to operate more than 360° to realize the opening and closing of the valve, and is mainly used for the gate valve and the shut-off valve device; the partial rotary electric device is mainly used for driving the valve running the 0 90° stroke, such as a butterfly valve and a ball valve. Plug valves and other equipment.
The multi-turn valve switch requires the actuator to provide output torque to the valve stem, and the threaded stem converts the torque into the required thrust of the valve to open and close the valve. Part of the rotary valve switch requires the actuator to provide the output torque to directly drive the valve flap to make a 90° rotation to realize the opening and closing of the valve.
III. Analysis of parameters affecting the price of electric equipment (1) Selection of electric equipment selection parameters and price of electric equipment in previous projects. For multi-turn valves, all or part of the following input parameters are provided by the valve manufacturer: torque (directly given or by Thrust estimation), stroke, pitch, action time, speed (valve stroke, pitch, action time), stem diameter, and then retrieve the output torque (or thrust) by outputting the data sheet of the selected brand's electrical equipment. And the maximum number of electric devices that allow the stem diameter to meet the requirements. The input parameters for the partial rotary valve are: torque, operating time and stem diameter.
(II) Mathematical analysis of the price parameters affecting the manufacturer's quotation selection table of the multi-turn electric device, the linear regression analysis method is used to analyze the influence of each parameter on the quotation. Linear regression is widely used in the field of mathematical statistics analysis. It is mainly used to determine the quantitative relationship between two or more variables. For example, given a variable Y and some variables x1,...Xn, these variables may be related to Y. Correlation, linear regression analysis can be used to quantify the correlation between Y and xj, and evaluate which xj has the greatest impact on Y. The mathematical analysis software PASW Statistics analyzes the following conclusions:
In order to study the influence of five independent variables (valve stroke, pitch, output torque, maximum allowable stem diameter, output speed) on the dependent variable (equipment price), the regression analysis model in mathematical statistics is used to analyze the dependence between variables. Analysis was performed using the mathematical analysis software PASW Statistics. The linear regression model of the dependent variable y and the independent variables x1, x2...xi is: y=β0+β1x1+β2x2+...+xiβi; where β0 is called the regression constant, and β1, β2...βi is called the regression coefficient, indicating The variation of the dependent variable y caused when the variable changes by one unit.
In order to compare the influence of the five independent variables (stroke, pitch, output torque, maximum allowable stem diameter, output speed) on the dependent variable (equipment price), the linear regression model can be used to calculate the regression coefficient of the independent variable and compare its absolute value. The larger the absolute value, the greater the impact on the price, so that the conclusion can be drawn. The PASW Statistics software calculates the results as follows:
The absolute values ​​of the normalized regression coefficients for stroke, pitch, output torque, maximum allowable stem diameter, and output speed are 0.199, 0.084, 0.722, 0.173, and 0.267, respectively.
Comparing the results, the output torque normalized regression coefficient is the largest, followed by the output speed. It can be concluded that among the five independent variables, the output torque and output speed have the greatest influence on the price of the dependent variable equipment.
For the partial rotary electric device, since it only needs to rotate 90°, the valve switching action can be realized, the torque is large, the rotation speed is low, and the valve stroke time can be used instead of the rotation speed as one of the price parameters. As with multi-turn electric devices, torque and travel time have the greatest impact on equipment prices.
IV. Analysis Conclusions The linear regression method can be used to analyze the output torque and output speed as the main factors affecting the cost of the electric device. The greater the torque of the electric device, the greater the power, the greater the power, the larger the motor and the gearbox are required, resulting in an increase in the price of the electric device; other parameters such as stroke, pitch, and maximum allowable stem diameter only affect the electric device and The valve interface, and the interface type has little influence on the internal selection of the electric device. As long as the valve interface is determined, the electric device supplier can pay attention to the connection with the valve.
CLC number: F275 Document ID: A Article ID: 1674-1145(2018)4-237-01