The Experimental Study Of The Effects On The Output Performance Of Optimization Design Of The Valve

Functional materials because of its low cost，performance， stability, longmanufacturing history has now become the main application of one of the materialsfor the advanced manufacturing technology, while the piezoelectric material has beenwidely used because of its excellent features, and thus has been developed a lot ofdriving and controlling devices, as one of the products, piezoelectric pump has been aconsiderable development in recent years, the piezoelectric pump use inversepiezoelectric effect of piezoelectric materials to realize the bending of piezoelectricvibrator and the volume change of the pump chamber by the deformation produced orthe use of transmission fluid fluctuations generated by piezoelectric vibrator to realizethe fluid output,Thus achieving a simple structure, small size, light weight, lowenergy consumption, installation ease of use, and controlling the output of fluid flowand pressure according to actual needs by regulating the input voltage or frequencyvalues. Piezoelectric pump is also applied in small mobile devices. CPU and graphicscard cooling system, video game control panel, blade servers, photovoltaic playingbatteries, household appliances, medical devices (insulin pumps, etc.), petrochemicalequipment, automotive and aerospace electronic equipment, water-cooled system, andmany fields of application. Due to its outstanding advantages, in recent years, theresearch on the piezoelectric pump has also been widespread concern. For now, thereare many question about piezoelectric pump, for example: low output flow rate,poorstability, low maximum output pressure, short life, obviously the bubble phenomenon,and poor self-absorption. A number of key technical issues need to be resolved. Thereis still a long way to go in its development.1. IntroductionDiscussing the process of development and the research status of the piezoelectricpump, highlighting the influence of the composition of the piezoelectric pump andpart of the performance of the piezoelectric pump, and making a brief introduction to a theoretical analysis of piezoelectric pumpclassification, and the key technical issueswith a piezoelectric pump, and getting the conclusion by emphasizing the importantinfluence of the characteristics of the passive valve to piezoelectric pump outputperformance, based on which, this article focus on the research of passive wheel-valve, seeking to improve the performance of output of piezoelectric pump throughthe rational design of the valve.2. Limit and pretension of the valveIntroducing the engineering calculation method of the piezoelectric pump outputflow rate, comparing with the experimental test, the author found that there is a biggap between the calculated value of the actual flow and engineeringresult.And givinga theoretical analysis of this phenomenon. There is an obvious impact on the outputperformance of the piezoelectric pump because of the lagging of passive valvepiezoelectric pump. Trying to optimize by imposing limits and pretension on the valveand designing the orthogonal test. The conclusions show that: a reasonable limit andpreload can improve the output performance of the piezoelectric pump3. Theoretical analysis and experimental testing of the multi-pistonpumpCoupled relationship based on the fluid and structure, the fluid-structure interactionadditional damping formula is derived to calculate the drag coefficient, known by thedamping formula: the damping coefficient and the cavity height is inverselyproportional to the third power, and the diameter of driven power is proportional tothe logarithmic increase with the valve hole and the radius of the drive, the driveradius of the cavity height to determine the circumstances, you can reduce the dragcoefficient by increasing the hydraulic diameter of the valve hole, based on thisenvisaged for importation with a three-valve parallel design, to ensure that theindividual valves resistance unchanged, increases the overall equivalent diameter, thusreducing the damping to reduce the energy loss increases the output of thepiezoelectric pump flow and best the purpose of operating frequency, andsingle-piston pump with three-valve parallel pump experimental test results show that:the parallel design of the inlet valve can effectively reduce the damping coefficient,due to lower energy loss, the final output of the piezoelectric pump performanceenhancements.4. The matches experiment of valveFound by theoretical analysis of the output characteristics of piezoelectric oscillator:in the case of that the same size is fixed and the input excitation of piezoelectric vibrator, piezoelectric oscillator input power is essentially the same, the final outputof the piezoelectric pump depends on the efficiency of the valve, the analysis foundthat: increasing the opening of valve does not necessarily make the improving tooutput flow of the piezoelectric pump, simulation analysis found that:when theopening of valves increases to a certain extent, the pressure changing has sloweddown, continuing to increase the opening could lead to the output flow rate decreasing,which is due to reverse leak increasing. Experimental test show that: by changingthe size of the valve hole, matching the size of the valve hole and the valve block,matching the stiffness of the valve plate of different thickness, the output flow isgreatly improved. The results showed the existence of an optimal valve hole size,which makes the output of the piezoelectric pump flow biggest: in the case of otherstructural parameters unchanged, which is also true with the size of the valves andvalve block, in addition, different thickness of the valve plate matching of rigiditymakes the piezoelectric pump output flow biggest. When the inlet-valve thickness is0.075mm; the thickness of the intermediate value is0.18mm; thickness of the outletvalve is0.075mm, the output performance is the best, maximum flow can be up to635.46ml/min, the best frequency is190Hz.5.Trial-Product and Experimental Research on35dual-chamberpiezoelectric pump prototypeAs the experimental prototype,35series dual-chamber piezoelectric pump is testedwith respect to its pump pressure, flow, and self-absorption,and the Principle ofwhich is analyzed.The results show that: After the reasonable match of the valve, themaximum flow of the pump can be achieved678ml/min, the output pressure of zeroflow can up to32kpa, the best frequency of200Hz, the maximum self-priming heightcan reach40cm in130V driving voltage.