| As a new type of diaphragm pump,the micro diaphragm pump is a diaphragm pump driven by a motor cam mechanism,which mainly meets the requirements of miniaturization and low working pressure.In recent years,it has become more and more widely used in the fields of medical biology,micromachinery,fine chemicals and aerospace.The research work of the domestic miniature diaphragm pumps started late and is not yet mature,and the microdiaphragm pumps on the market have problems such as low output performance,complex structure,and poor stability.Therefore,the purpose of this paper is to develop a high-performance and high-stability micro-diaphragm pump.Starting from the core components of the power and hydraulic ends of the micro-diaphragm pump,the overall dynamic characteristics of the pump and the hydraulic characteristics of the diaphragm valve are studied in depth.Corresponding optimization design and performance improvement provide technical support.The research work of this article is as follows:(1)The overall structure and working principle of the micro-diaphragm pump are elaborated,and the calculation formulas for the theoretical performance data of the pump such as flow rate,pressure and power are preliminarily deduced;the key components such as the volume chamber and pump valve of the micro-diaphragm pump are selected Type and size design.It provides a theoretical basis for the simulation of micro diaphragm pump and the analysis of fluid-structure coupling.(2)The overall simulation model of the miniature diaphragm pump was built by AMEsim software,and the effects of outlet pressure,diaphragm diameter,cam speed and maximum stroke on the dynamic performance of the pump were further studied.The research results show that: as the outlet pressure increases,the average output flow of the pump decreases,and the maximum outlet pressure can reach 0.15MPa;when the maximum cam stroke,cam speed,and diaphragm diameter increase,the average output flow of the pump increases,and the maximum cam stroke is When 2.4mm and the diameter of the diaphragm are 28 mm,the pump’s average output flow rate is higher and the performance is also the most stable.(3)The fluid-solid coupling method was used to numerically simulate the diaphragm valve at the hydraulic end under different flow path diameters,and further completed the internal flow field characteristics of the diaphragm valve and the static analysis of the diaphragm.The results of the study show that the outflow basin has greater pressure and impact on the diaphragm than the inflow basin,and the outflow membrane is more deformed and more prone to fatigue failure.At the same time,when the hydraulic end structure of the miniature diaphragm pump is optimized,the hydraulic force The diameter of the end flow channel should be 3mm,which is most suitable.(4)The experimental platform of the miniature diaphragm pump was built and the experimental study of pump delivery performance was completed,the accuracy of simulation and fluid-structure coupling analysis was verified,and the structural parameters of the core components of the pump were further optimized.The experimental results show that: when the input voltage is increased to 24 V,the pump flow rate gradually increases to a maximum and the maximum value is 580 m L / min,the limit value of the outlet pressure under normal pump operation can reach 0.3MPa;the diaphragm-piston ratio is 0.3 and the cam is the largest When the stroke is 2.4mm(the cam eccentricity is 1.2mm),the pump output flow is not only high and stable;when the valve diaphragm cantilever width is 4mm and the hydraulic end flow channel diameter is3 mm,the pump is in a high outlet pressure working environment,The output performance is the best. |
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