Three Dimensional Static Thermal Analysis And Thermal Intensity Calculation Of Control Valve

The leak of control valve is a hard problem to deal with, and the temperature in the actuator has a serious requestion.So that the seal and the control about the electric control valve are good or bad is a key factor, which refers to the distribution of the temperature. Then it is a guiding significance to gain the thermal field of the control valve. On this basis, we look forward to doing some beneficial research about forepart design for the future to reduce the blindfold design and experiment cost.The model, three way type of electric control valve, is a three-dimensional combinational construction. During the analysis, direct coupling method and sequence coupling method are used. The model of electric control valve is built by PRO/E three-dimensional software firstly, and then three-dimensional static temperature field and the stress fields about some parts are obtained by ANSYS with FEA solution. In the aspect of ascertaining the boundary condition of electric control valve, the natural convection outsides is calculated conservatively with constant wall temperature and the emissivity is got by relative manuals.There are three methods to analyze the thermal field of electric control valve: the heat-flow coupling, the thermal field with being loaded forced convection, the thermal field with being loaded directly the temperature. The fluid temperature and the temperature loaded directly are both 290℃.The results indicate that: 1 ) The temperature gained in the single thermal field with the convection heat transfer is lower than the temperature gained in single thermal field with temperature 290℃,and the temperature gained in single thermal field is the highest. Although the thermal field gained with heat-flow coupling is the most reliable result, the thermal field gained with the method of heat-fluid coupling takes much time.And considering the principle of thermal balance, the temperature can be applied directly to simulate to gain the result. 2) Thermal radiation is the main way to cool the electric control valve off. So it is an effective way to dissipate the temperature on the actuator of the electric control valve by shifting the natural convection into forced convection or changing the straightly barrel-shaped structure into the plate-fin structure. The thermal stress analysis of electric control valve indicates that:1) The stress value of the body and the disc with the seat rings are under the allowable stress when they are analyzed alone, but when being analyzed with the whole model, the body is not;2) The stress in the packing rings is far above the allowable stress. It shows that the packing rings are under the plastic deformation and should be analyzed with the method of the elasto-plasticity.