Research On Pneumatic Servo Valve Based On PZT Actuator Driven

Traditional large-scale use of fluid control solenoid valve as a mechanical power conversion level, the control signal is converted to mechanical displacement, spool to promote and achieve access switch, switch, or the output pressure and flow control. Solenoid valves are cheap and easy to operate, but the existence of size, power consumption, and slow to respond to, electromagnetic interference, such as fever and shortcomings, in the strict demands on the output of small flows occasions; the need to respond quickly to the occasion; of reactive consumption, size, anti-interference ability, safety and reliability, there are strict requirements of the application has been limited occasions.Takes the valve driver's insufficiency in view of the electro-magnet, the present paper -accumulates the level type piezoelectricity driver by the new valve core drive to actuate the release lever type flexible hinge to take the object of study. Accumulates the level type piezoelectricity driver to have does not need the transmission system, the displacement control precision, the speed of response quick, to tally the gap without the machinery, to have the big strength output and the component does not have the power loss nearly the merit. Proposed that the use accumulates the level type piezoelectricity driver is a power supply, enlarges the principle using the release lever to accumulate the level type piezoelectricity driver's displacement to carry on the enlargement, from this constructs the piezoelectricity air operated servo valve, and conducts the deep research from the theory and the simulation two aspects.The paper primary coverage is as follows:The first chapter, broad present paper research background; Has analyzed the traditional valve's application limit; Summarized the new intelligent material and driver's in valve control merit and the utilization; Has outlined the piezoelectricity valve's research present situation and the development direction; Has outlined the present paper main research content.The second chapter, introduction piezoelectricity material basic physical property and important performance parameter. Transformed the mechanism to the piezoelectricity material electrical machinery to carry on the elaboration, had expounded the piezoelectricity actuation's basic theory question, provided the instruction theoretically for the next step product level type piezoelectricity driver's modelling analysis.The third chapter, through the theoretical analysis, obtains accumulates the level type piezoelectricity driver's transfer function model; Established accumulated the level type piezoelectricity driver multi-layer piezoelectricity structure the finite element model, obtained static, the dynamic duty analysis result; Theoretical analysis's result indicated that accumulates the level type piezoelectricity driver to have the big output to move and to output the strength as well as has the good dynamic response characteristic.The fourth chapter, in the summary existing flexible hinge and the micro displacement enlarge the organization in the foundation, proposed the single axle flexible hinge's design method, declined the displacement to the release lever to enlarge the principle to carry on the thorough research analysis. Analyzed the micro displacement using the finite element method to enlarge the organization the enlargement factor, the input rigidity and the output rigidity, analyzed the modular design parameter to enlarge the organization performance the influence, and has carried on the contrastive analysis with the theory result, obtained the micro displacement to enlarge the organization the design parameter and the performance influence relations.The fifth chapter, declined the displacement using the release lever to enlarge the organization to design the valve core motion, established the valve core movement system model, the research has analyzed the static state, the dynamic property, discovered the influence performance the primary factor and the influence rule, obtained the valve core displacement and the first-order natural frequency. The finite element analysis result indicated that accumulates the level type piezoelectricity driver union elasticity by PSt150/7/80 to return to the release lever type valve core motion valve core displacement which the doubling plate actuates to achieve 202μm.The sixth chapter, uses PSt150/7/80 to accumulate the level type piezoelectricity driver coordination release lever type displacement to enlarge the organization to form one kind of release lever to enlarge the translation type piezoelectricity servo valve. This valve selects the valve core built-in structure method, realizes the valve core bidirectional movement using Shan Diedui; Used the steel ball connection to reduce the radial force which the valve core received; Used the voussoir type to adjust the organization to realize the valve core displacement's fine control, improved the valve core to the precision; Uses the screw vice-pretightening up force adjuster, may exert the adjustable pretightening up force to the valve core motion. Enlarges the translation type piezoelectricity servo valve model simulation with the AMEsim software to the release lever, the simulation result indicated that this valve valve core displacement achieves 202μm, under the 7bar pressure's maximum mass flow is 6.07g/s, system's response time is 8ms. In view of the new piezoelectricity pneumatic valve's design innovatively proposed that one kind of new drive, and analyzes in this drive uses the simple the enlargement organization, utilizes AMESim in software's HCD module build piezoelectricity air operated servo valve's simulation model and to this pneumatic valve's basic static state, the dynamic property simulation.May do the further work in the later research: Carries on the precise fluid study to the piezoelectricity translation type air operated servo valve, dynamics as well as thermodynamics modelling, and uses the appropriate control method, enhances its work the stability and the reliability; The choice or the design performance better piezoelectricity driver, reduces the piezoelectricity driver the equivalent capacity comes to be possible to further raise the piezoelectricity air operated servo valve's speed of response; Increases the piezoelectricity driver's output displacement and the driving influence causes the piezoelectricity air valve to obtain the bigger delivery rate.