| The vacuum sewage system uses the atmospheric pressure difference as the power source to discharge the sewage.Therefore,Good sealing performance is the key to the dirt can be smoothly discharged to the compost bin for harmless treatment.The Sealing ring is a common sealing device in vacuum sewage system.This article mainly focuses on the key factors affecting the sealing performance of the vacuum toilet seal in the indoor vacuum sewage system.To find the best design parameters The study of the seal ring involves the theory of nonlinearity of the rubber material and the basic theory of finite element,The single Axial tensile experiments,etc.,The key factors affecting the sealing performance of the sealing ring in the vacuum toilet include: vacuum degree,friction coefficient,fit tolerance,etc.And these factors were carried out numerical simulation analysis.The results of the simulation were used in MATLAB to interpolate the data to obtain the most Optimal design parameters,And using the optimal parameters to produce samples,Finally.Designing experiments to verify whether the sealing performance of the sealing ring is qualified.The main work contents are as follows:First,Comparing the performance characteristics of common materials of different sealing rings,choose the appropriate nitrile rubber material as the material for making the sealing ring,And then using the nitrile rubber material to make rubber samples,And performing uniaxial tensile experiments on the rubber samples to obtain stress and strain data.,Drawing the experimental data into a stress-strain diagram and comparimg it with the four commonly used constitutive model stress-strain curves,And find that the Mooeny-Rivlin constitutive model is the closest to the experimental data,And choosing the Mooeny-Rivlin constitutive model for numerical simulation simulation.Secondly,The necessary simplification of the entire simulated model,The use of three-dimensional drawing software Solidworks to draw part drawings,After being assembled into an assembly drawing and imported into the finite element software ANSYS,First pre-processing of the finite element model.And then using Mooeny-Rivlin constitutive the model and the control variable method are used to numerically simulate the influence of various influencing factors on the stress of the contact surface.The simulation results show that the vacuum degree has a small effect on the stress of the contact surface,from 1.03 Mpa to 1.56 Mpa,And only greater than 1.3 Mpa can achieve the seal Performance requirements;The influence of the friction coefficient on the contact surface stress decreases from small to large,And the optimal friction coefficient is about 0.25;The effect of the fit tolerance on the contact surface stress first increases with the increase of the tolerance,the best fit tolerance is 0.23 There is no obvious change in the contact stress afterwards.The best design parameters under the powerful data processing function of MATLAB are the friction coefficient of 0.26 and the fitting tolerance of 0.22.Finally,using the obtained optimal design parameters to open the production samples of the product,conducting physical experiments under the experimental platform provided by the partner company,And using the designed seal ring in the vacuum indoor sewage system,every 5 minutes within 30 minutes Measure and record the vacuum degree in the vacuum system.The experimental data shows that the gas leakage rate is less than 5% within 30 minutes,which meets the acceptance standard of the vacuum drainage system.The designed vacuum sealing ring meets the sealing requirements.This method can reduce the production cost and shorten the design cycle.It has a guiding significance for the design of related sealing rings,promotion the localization of related vacuum equipment,And contribution to the development of an energy-saving and emission-reducing society.Share strength. |
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