Study On The Hydraulic Characteristics Of The Micro Diaphragm Pump And The Finite Element Analysis Of The Diaphragm

The micro diaphragm pump is a new type of diaphragm pump,which is driven by motor and cam mechanism,mainly to satisfy the miniaturization,low output performance requirements,in recent years,it's applications in bio medicine,micromachinery,fine chemical industry,aerospace and other fields are widely used,showing good prospects for development.Diaphragm and buffer chamber as the parts of the diaphragm pump that are in direct contact with the conveying medium are the key to directly affect the performance and service life of the diaphragm pump.Due to the size and structural characteristics of the micro-diaphragm pump,less research has been done on its diaphragm.However,the research on the effect of the buffer chamber on the overall hydraulic characteristics of the micro-diaphragm pump is less promising.Therefore,it is of great significance to analyze the key components and hydraulic characteristics and provide theoretical basis for the development and optimization of micro diaphragm pumps and similar pumps.In this paper,the working principle and composition method of the diaphragm pump are studied and analyzed.Hydraulic characteristics of the micro diaphragm pump and performance of the diaphragm are discussed emphatically and analysed comtrastively based on numerical simulation and experimental research methods.Firstly,the working principle of the micro diaphragm pump is described.The motor is used to form the power to drive the rear drive mechanism to push the connecting rod to reciprocate,and the rubber diaphragm is driven to inhale and discharge the liquid.At the same time,the calculation formulas for theoretical performance data of micro diaphragm pumps such as flow rate,pressure,and power are deduced,and the selection and size design of key components such as the buffer chamber and pump valve of the micro diaphragm pump are performed.Secondly,using ANSYS software,the structural non-linear analysis method and the fluid-solid coupling transient analysis method were used to simulate and analyze the rubber diaphragm of the micro diaphragm pump.By comparing the simulation results of the two groups,we obtained that the most reasonable value for the actual working condition of the diaphragm was fluid-solid coupling analysis method.Based on this,the motion law is explored and the diaphragm is optimized.Then FLUENT software was used to numerically simulate the internal flow field of the micro diaphragm pump's buffer chamber to study its effect on the hydraulic characteristics of the pump body.From the intuitive understanding of the buffer chamber for the micro diaphragm pump pressure characteristics and pipeline flow characteristics of the improvement effect to verify the rationality of the design of the buffer chamber and the necessity of the setup.At last,the prototype of the micro diaphragm pump was prepared,and the performances of the liquid and gas transport were studied respectively.The structural parameters of the reciprocating motion unit and the pumping unit of the micro-diaphragm pump were optimized through the experiment method.Comparing with the simulation results,the accuracy of the numerical simulation was verified.The reasons of the key components affecting the output flow and the output pressure of the micro diaphragm pump were analyzed and the scientific guidance for the optimal design of the micro diaphragm pump was obtained.