| As it has appeared in the1970s, now cartridge valve has become a vital part of the hydraulic control systems. Cartridge valve has many advantges such as large-flow, high-pressure, high-sensitivity and so on, so it is being widely used in areas like flow-controlling, direction-controlling and pressure-controlling. However, the structure parameters have considerable effects on its performances. So, designing the reasonable parameters becomes a critical part of cartridge-design. With the development of computer technology, combining the new technology with traditional basic theory, now CFD and system dynamics simulation are widely used. This method been used to analyze the valves is the development direction of the hydraulic design.The main parameters related to the performance of the cartridge relief valve are dynamic performance and static characteristics of flow field. It is very important for researcher to study these characteristics. In this thesis, the author choose a certain type of screw-pilot relief valve as the prototype, and completed the relief valve cartridge design, simulation, optimization, test-bench design and the performance-test based on it.This thesis includes the following sections:(1) According to the cartridge relief valve designing requirements, the design-calculations of cartridge valve was completed.(2) The CFD-calculations for the cartridge relief that has been designed was completed and the FLUENT was used to simulate its flow field. Using the contours and vectors of the pressures and velocities, the improper design was found out and corrected.(3) Then, the author established the dynamics model of the relief, and simulated it in SIMULINK. Also, the further optimization was completed which bring the parameters closer to the real relief valve system.(4) The author designed a cartridge integrated performance test bench and completed the principles design and involved in the manufacturing etc. The dynamic response curve of this relief valve that has just been designed was figured out on this test bench. With the comparison of test parameters and simulation resulis. the rationality of the design and simulation of the cartridge relief valve has been proven at last. |
