Research Of Triple Eccentric Butterfly Valve Interference Processing Software Based On C#.NET

Since the 1970s, the triple eccentric metal sealing butterfly valve was invented abroad, it has a wide range of uses in the high-pressure fluid systems of industrial production because of its small hoist torque, sealing with oblique cone, good tightness abrasion resistance, and long life of use.It was introduced into China since the 80's, there have been only a few manufacturers in the country having the capable of producing three eccentricity metal sealing butterfly valve, but there are still some key technologies not to solve. For example, the sealing design of complex space surfaces, is not only difficult to manufacture and easy to interfere, far to get the requirements of zero friction, zero leakage, and closing quickly.At present, the sealing design method of domestic butterfly valve is mainly based on experience parameters; there is still not structure optimization and design software about triple eccentric butterfly valve in China. Many manufacturers are using experience data and relative simplified calculation method to determine the basic data of the triple eccentric butterfly valve, it is difficult to make products get requirements of non-interfere, small torque and zero leakage. It is very important to develop the interference analysis software of triple eccentric butterfly valve.The basic structure of triple eccentric butterfly valve was analyzed, the main structure parameters such as the butterfly plate thickness calculation, axial eccentricity estimation etc were given, the relations among several major section of geometrical parameters (the long axis, short axis) of the butterfly plate and three eccentric quantity were deduced, at the same time proposing requirements of parameter optimization.The analysis on movement of the butterfly valve is mainly discussing the performance of interference, the interference analysis of the three eccentric butterfly valve is a very important segment of its performance evaluation. According to the kinematic relationship between structure design and agencies of sealing butterfly valve, the three-dimensional model of sealing butterfly plate was established, using the computer writing program C # to calculate the opening and closing angle when each point on the sealing surface of the disc body is turned on, to verify whether the body produces interference, adjusting the parameters of the three eccentric, to determine the minimum radial three eccentric butterfly valve, which provides the basis for the selection of butterfly valve actuators.The interfere analysis software of triple eccentric butterfly valve was tested in this paper, the design parameters was optimized by it, and according to the optimized design parameters, The maximum and minimum values of axial eccentricity, radial eccentricity, angular eccentricity were calculated, and any two non-consecutive points were taken between the maximum and minimum to calculation the friction torque, then the results were compared. The results of comparative analysis showed that the optimal design of the calculated friction torque was significantly reduced, the operating torque was effectively reduced, the service life was improved.Through the research above, the compilation triple eccentric butterfly valve analysis software can analysis the basic structural parameters of triple eccentric butterfly valve and calculate the direction angle of opening and closing, friction torque and interference analysis , made the software guide the design of triple eccentric butterfly valve without interference, the butterfly plate movement than pressure distribution sealing even, friction torque is small, and provide quick and efficient design method.