Structure Design And The Flow Field Analysis Of The New Diaphragm Pump

Diaphragm pump is a kind of reciprocating pump.But compared with the traditional reciprocating pump,the reciprocating diaphragm pump on the hydraulic side is equipped with rubber diaphragm,and the conveying slurry with the power components are separated by rubber diaphragm,so the driving part from solid particles in slurry abrasion.In addition,the diaphragm pump with its working mechanism of the hydraulic end of unique advantages,the diaphragm pumps are applicable for high viscosity,volatile,flammable,solid-liquid two-phase flow in industrial liquid.But currently,the existing diaphragm pump is widespread problems such as low flow coefficient of discharge pressure pulsation.Aiming at this fact,in this paper for the diaphragm pump power end output speed and hydraulic end suction drainage performance improvement are put forward.Designed a new diaphragm pump,and related research work mainly revolves around the following five aspects:(1)Suggested the use of non-circular gear combination of slidercrank mechanism to replace the crank slider mechanism.To optimization of the mathematical model of combined mechanism,it is concluded that the elliptical gear eccentricity in the combined mechanism Main parameters crank eccentricity ratio and length of connecting rod.To design a new diaphragm pump drive gear to lay the foundation.Lay the Foundation for the design of new type of diaphragm pump transmission mechanism.(2)Single-acting diaphragm pump as the research object,the derivation of the theory of main parameters such as flow rate,flow uneven coefficient.Analyzed the low flow coefficient and the pulsating flow of transfusion pipe and pump body stress damage.To improving the performance of the diaphragm pump drainage by using the principle of the drainage of the structural design of the guidance of the traditional hydraulic.Related research laid the foundation for design of diaphragm pump of the hydraulic end.(3)In diaphragm pump power end of the transmission system,connecting rods and crankshafts are the key component in the Transmission Mechanism of wear parts.Analysis in process of crankshaft and connecting rod bearing,which provides theoretical guidance for finite element analysis.Before the prototype manufacture,for the design of crankshaft connecting rod fatigue life analysis,and check parts fatigue strength safety factor and damage cloud.(4)The crank drive mechanism is complex.To view the crankshaft in the dynamic load dynamic response,modal analysis and harmonic response were analyzed of the crankshaft.By modal analysis to obtain the natural frequency and the frequency values of crank shaft may be the vibration of the form.After check the harmonic response analysis,extract the crankshaft acceleration response spectrum under dynamic loading;determine the crankshaft can overcome resonance.(5)Pump valve in the fluid end is the key component to obtain the flow rate of valve clearance rules,and guide the structural design.With the liquid inlet valve for example,through the valve design about the structural and functional characteristics.And on the valve gap flow field simulation,through the simplification and the establishment of physical model,introducing turbulence mathematical analysis model,the flow field analysis of the parameters set.According to the analysis results to guide improvement on the structure of liquid inlet port.In this paper,the content above the results of the study said: through the adoption of combined mechanism compared with traditional power end,slider output speed close to uniform,and reduce the operation of reciprocating inertia force and the pump body vibration noise;cavity structure improvement to the traditional hydraulic diaphragm end,which improves its flow coefficient,reduce the pressure pulse;checking the crankshaft and connecting rod fatigue strength safety factor cloud image,the analysis of the minimum value is greater than 1,all meet the fatigue strength,and the improved damage cloud picture shows the vulnerability of the injury;Viewing the value of the transient response,the design of the crankshaft transient excitation can be overcome,Resonance phenomenon does not occur.Based on the velocity distribution of flow field images of valve gap and streamline analysis of the liquid inlet port,get the high velocity valve and a liquid inlet-side vortex phenomenon.In order to avoid negative phenomena,improve its structure,slightly increasing the number of cone angle valves,liquid inlet tube and the upper part of the structure of reciprocal cuts.