Research On Static Design And Dynamic Coupling Of The Pipeline Network Of Medical Water

For a long time,the design of medical water pipes under the complex coupling state for lean design has been one of the hot topics in research.Based on the school-enterprise cooperation project "Dynamic Digital Quantitative Design of Medical Water Pipeline Network",this paper carries out research on the coupled long-pipeline medical water pipe network system,including analytical calculation,digital analysis and design,solution of hydraulic distribution and dynamic decoupling,design of sanitary throttle control holes and reasonable installation of system components,green energy-saving control mode,fault tracking and so on.In the whole life cycle of water pipeline network,satisfactory results have been achieved in design,installation and operation.Firstly,through static design and dynamic decoupling,the reasonable and scientific design of the pipeline network system is realized,the operation cost and one-time input cost are reduced,the reasonable installation of the system is realized,the phenomenon of water hammer is basically avoided,the stable operation of the water system is realized,the service life of the whole pipeline network is prolonged,and the cost is reduced in disguise.Secondly,through systematic research,it can provide a new way to reduce system faults and pseudo-faults and realize the green and energy-saving control mode of the system;through the flow-pressure tracking query method,the system fault tracking can be realized,which provides a new scheme for water system fault diagnosis.In this paper,theoretical analysis,digital design,simulation solution,experimental verification and other means are used to carry out the following work:1 The static analysis of medical water pipeline network is carried out.The main work accomplished here includes: firstly,potential problems of water pipeline system are analyzed,including unreasonable selection of pumps,water pipes,diaphragm valves,heat exchangers and spray balls,resulting in system failure;secondly,problems solved by static digital design of water system are expounded;thirdly,digital theory of static decoupling of water pipeline network,Ohm’s law of quasi-electricity.The theory is deduced in detail and relevant conclusions are drawn to guide the digital simulation of AMESIM.Fourthly,the water pipe network is revised via the theory of space gravity field,and the specific numerical value is verified by FLUENT simulation to compensate for the coupling effect of gravity field on water intake.Fifthly,taking the injection water system of a workshop as an example,and based on AMESIM of the fluid simulation software to solve the static simulation of the pipe network of medical water,the static flow resistance distribution,flow velocity distribution,pressure distribution,theoretical flow distribution of each water intake point under the target working condition,and the equivalent diameter of the throttle hole of each water intake point are obtained.It proves that the original design of the design institute is unreasonable,and obtains the superiority of static digital design compared with the original design from the perspective of net power.2 In the case of neglecting the length of the branch at the intake point,the hydraulic distribution of the pipeline is deduced firstly,including the hydraulic distribution of the pipeline under the influence of dynamic non-linear damping and the condition of the hydraulic stability of the pipeline.Secondly,the analysis of pipeline hydraulic transient vibration includes: first,neglecting friction damping,water hammer vibration caused by instantaneous closure of valve;second,water hammer vibration caused by instantaneous closure of valve under linear friction damping;third,water hammer vibration caused by instantaneous closure of valve under non-linear friction damping.Finally,based on STARTTCCM software,the multi-physical field coupling visual simulation of dynamic pipeline is carried out.Relevant conclusions are drawn,which provide theoretical basis for guiding the installation of the pipe network of medical water system and avoiding water hammer and noise in the pipeline network.Meanwhile,the service life of the pipeline network can be improved through relevant measures.3 Combined with the static analysis and dynamic coupling analysis of the pipe network of medical water,it provides a scheme for the design of the control hole of the sanitary throttle and the reasonable installation of the system components.On the one hand,it solves the design and performance verification of the throttle hole for the open-loop control scheme of the diaphragm valve plus the throttle.On the other hand,it puts forward the requirements for the installation of the relevant components in the design process of the pipe network of medical water.4 Complete the green control and fault tracking of the pipe network of medical water.For the Green Energy Conservation Control Model of the pipe network of medical water,an example of injection water system is taken as an object.Firstly,the basic control principle based on PLC control,semi-closed loop control(open-loop control of water intake point),is introduced.Secondly,the basic components of related control systems,such as AC asynchronous motor,frequency converter,centrifugal pump,are introduced.Then,Then it introduces the green control strategy-flow inquiry frequency conversion feedback control based on P LC’s PID.For the fault tracking of the pipe network of medical water,based on the static analysis and dynamic coupling analysis of the pipe network of medical water,the basic method of fault tracking called the tracking and positioning of flow-pressure head is introduced first,and then the related processing flow is introduced.5 According to the digital solution,dynamic decoupling,green control and fault tracking design of the pipe network of medical water,the water system is experimented.The specific items of the experiment include: design flow rate,return water velocity,pump outlet pressure,circulating power of each working condition,etc.The experimental process is derived from the data collected by the automatic control system and further processed into images.The typical working conditions of the whole injection water system were compared and the relevant conclusions were analyzed.Finally,the rationality of the design,installation and control of water pipe network system is verified,which provides practical verification for the design of pharmaceutical purification pipeline.