The Design And Study Of A Pipe Cleaner Driven By Mechanical And Hydraulic

The large plate heat exchanger is an indispensable heat exchange equipment in the shipbuilding industry.It has the advantages of high heat transfer coefficient,small floor space and long service life.However,the cleaning of the dirt in heat transfer tube wall has always been a difficult problem.The deposition of soft dirt in the pipe wall will condense into a layer of hard scale if it is not cleaned for a long time,it will resulte in dangerous accidents such as heat deformation,cracks,and pipe burst.At present,the commonly used cleaning methods are dismantling and cleaning the heat exchanger after it has been in operation for a certain period of time,but it will take a lot of manpower and material resources and brings about the loss of industrial property.If the soft dirt can be scraped,it will inhibit the generation of hard scale layer from the source,and will solve the difficulty of heat exchanger cleaning.Therefore,this paper propose a new type of heat exchange tube cleaner,which can advance,retreat and rotate in the tube,and complete the cleaning of the dirt on the inner wall of the heat exchange tube.According to the working environment of the cleaner and its design goals,proposing various types of cleaners.Through the analysis of the advantages and disadvantages of different types of drives,the drive type of the cleaner is finally determined as the combined drive of the fluid and the motor.Dividing the structure of the cleaner into three main components: a guide support mechanism,a folding and cleaning mechanism,and a pressure-driven mechanism,and analyzes the motion characteristics of the cleaner during operation.The material of each part of the cleaner and the model of the motor shaft were determined,the overall design of the cleaner and 3D modeling were completed.The three components of the cleaner are analyzed and studied in depth.The analytic hierarchy process is used to optimize the scheme of the folding mechanism,and the coordinate relationships and kinematics equations of each member are calculated.The kinematics simulation was performed during the unfolding process to verify the correctness of the theoretical equations and optimize the deployment process.Theoretically,the contact force equation of the guide support mechanism is calculated and verified by ADAMS.The running stability and obstacle avoidance capability of the guide support mechanism are simulated by ADAMS,and the maximum speed limit of the washer is obtained.The FLUENT fluid simulation determines the size of the gap between the pressure-driven cup and the tube wall,and the fluid-solid coupling simulation under working conditions is performed based on ANSYS Workbench.Its static characteristics and vibration characteristics under fluid pressure are studied.Prevent its destruction during work.A theoretical calculation model of the flow field in the heat exchange tubes was established,and the distribution of the flow field characteristics after pressure changes in the liquid filled tubes was analyzed.It was concluded that the cleaner should enter the heat exchange tubes after a boost of 4 seconds;based on ICEM CFD and FLUENT simulates the movement process of the cleaner in the pipe,and monitors the driving force of the cleaner to the cleaner in real time.The variation of the flow field distribution with different operating parameters is obtained,and the cleaning is determined by combining the fluid driving force under different working conditions.