| In order to meet the needs of space-saving and cost-effctive requirements as seawater desalination system integrated machines for using in small islands,ships,submarines and offshore platforms,this paper combines the advantages of current positive displacement energy recovery technology with rotary high pressure piston pumps and flow path characteristics.The integrated machine design of the energy recovery part,high pressure p?mping part and pressure boosting part in the reverse osmosis desalination system.The all-in-one machine is a multi-channel dual-chamber single-rotor coaxial structure that can realize the functions of the three key equipments in the seawater desalination system,and has the following advantages:Smaller footprint,no intermediate Connecting pipelines and control valves greatly reduce the high-pressure dynamic and static sealing links,which in essence improves the safety and reliability of the system.In this paper,the energy recovery pressurization integrated device as the research object,through the combination of theoretical calculations,simulation analysis and experimental research on the key components of the one-piece device structure design and mechanical characteristics of the analysis focused on the one machine device distribution,The contact forms and mechanical properties of important friction pairs,such as the plunger pair,sliding shoe pair,and spherical joint pair,have acc?mulated technical and engineering experience for the research work of miniaturized energy recovery devices.The main content of the paper is as follows:(1)The working principle and working process of the energy recovery booster integrated machine are described.According to the flow rate and pressure and other process parameters,the preliminary design of the plunger deputy structure size.A three-dimensional model of the all-in-one device was built using Pro/Engineer to perform kinematic analysis of the plunger and the shoe.Using MATLAB to analyze the leakage characteristics of piston and rotor bores and clearance optimization,the pulsation characteristics of the device flow were analyzed.It is determined that the working pressure of the integrated device is p=6MPa,the rated flow of treated seawater is Ql=5m3/h,the clearance of the plunger's subcylinder hole is 6?10?m,the volumetric efficiency is controlled within 4.0%,and the flow rate fluctuation rate is 0.024.(2)Mechanical analysis and structural design of the key components of the integrator,such as the plunger,the shoe,the rotor cylinder,the thrust disk,the valve plate,the rotor bearing,and the central spring,and the completion of the processing of the key components.Pairs of materials such as flow distribution pair,plunger pair,skid pair,spherical joint pair and other important friction pairs are selected for material analysis,and the soft-to-hard pairing method between the modified polyetheretherketone engineering material and the duplex stainless steel 2205 metal material is selected.Has good resistance to seawater corrosion,mechanical strength and surface hardness.The mechanical properties of the modified polyetheretherketone composites were tested.The strength limit of the modified polyetheretherketone composites was 123.3MPa and the Young's modulus was 5.6GPa.The clearance between the bottom surface of the sliding shoe and the swash plate end surface,the flow distribution auxiliary end surface and the rotor bearing and the rotor cylinder is 8?12?m,and the maximum volumetric efficiency is controlled within 4.1%.The design of all friction units of the integrated machine is both seawater lubrication and efficient sealing feature.(3)The static analysis and contact analysis of the plunger pair,-spherical joint pair,sliding shoe pair and flow distribution pair were carried out using the ANSYS structural module.The stress distribution,deformation and main influencing factors of the core components were discussed.The displacement of the contact area of the plunger pair is 3.2?m,the deformation of the bottom surface of the sliding shoe is 3.3?m,the deformation of the contact area of the ball joint is 5.0?m,and the deformation of the distribution seal belt is 5.0?m,both smaller than the designed seawater film.Half of the thickness,and the stress intensity at each location is significantly less than the material allowable stress,the simulation results verify the design feasibility and structural reliability of the integrated machine.The design and technical improvement of the spherical joint and the flow distribution pair were optimized.The design scheme of the stainless steel metal substrate covered by the modified polyetheretherketone composite material was adopted for the sliding shoe and the valve plate.The thickness of the sliding shoe pad was 0.5mm.The thickness of the cover film outside the plate is 1mm.(4)Analysis of off-shoe experiment on manufactured spherical joint sub-assembly and observation of variation of load-deformation curve.Combining with the simulation results of the spherical hinged sub-model,the mechanical response analysis of the decoupled off-shoe failure of the spherical joint was explored.The spherical articulated sub-model designed and manufactured in this paper was able to withstand the ultimate tensile load of about 4000N.It was effective in the operation of the integrated device dealing with the load under various conditions.Finally,summarize the full text and look forward to the next step. |
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