Three-dimensional model construction method of eccentric driven shaft cold water pipeline structure

Abstract

The invention relates to the technical field of engineering simulation, in particular to a three-dimensional model construction method of an eccentric driven shaft cold water pipeline structure. The method comprises the following steps: obtaining an N-type eccentric driven shaft cold water pipeline structure assembly drawing, carrying out part geometric analysis and three-dimensional geometric construction to generate an N-type eccentric driven shaft cold water pipeline geometric model, importing the N-type eccentric driven shaft cold water pipeline geometric model into a corresponding fluid flow simulation module, and carrying out fluid Reynolds number calculation to obtain a Reynolds number; the method comprises the following steps: setting boundary conditions and thermal conditions, performing thermal coupling simulation modeling, and performing cross grid division and heat exchange working condition simulation analysis to generate a heat exchange simulation process; and heat exchange iteration convergence solution is carried out on the heat exchange simulation process, and convective heat exchange derivation analysis and pipeline structure optimization design are carried out at the same time, so that an eccentric driven shaft cold water pipeline optimization structure is generated. According to the invention, the pressure drop in the pipeline can be reduced and the distribution of convective heat transfer coefficients can be optimized.

Description

Technical Field

[0001] The invention relates to the technical field of engineering simulation, and in particular to a method for constructing a three-dimensional model of a cold water pipeline structure of an eccentric driven shaft. Background Art

[0002] As a key part of the cooling system, the cold water pipe structure of the eccentric driven shaft has an important structural design for the fluid flow performance, heat exchange effect and system stability. At the same time, more and more researchers have begun to use three-dimensional modeling and computational fluid dynamics (CFD) simulation technology to optimize the design of cold water pipes. Based on the three-dimensional modeling technology, combined with the special structural characteristics of the cold water pipe of the eccentric driven shaft, the three-dimensional model of the pipe is accurately constructed, and the design is optimized through efficient simulation analysis. This method should have the advantages of high efficiency, accuracy and flexibility. It can reduce the consumption of computing resources while comprehensively improving the design quality and performance of the cold water pipe system, so as to accurately simulate the fluid flow, temperature field distribution and pressure change in the cold water pipe of the eccentric driven shaft, and then optimize the structure and layout of the pipe, improve the cooling effect and energy efficiency. However, the existing cold water pipe structure construction methods often rely on manual calculations and traditional CAD design tools. Although these methods can meet the basic design requirements, it is difficult to effectively simulate the actual operation state of the pipe in a complex three-dimensional space environment, and it is impossible to fully consider the changes in fluid flow and temperature distribution caused by the eccentric shaft, resulting in low accuracy of the three-dimensional modeling design results. Summary of the invention

[0003] Based on this, it is necessary for the present invention to provide a method for constructing a three-dimensional model of a cold water pipe structure of an eccentric driven shaft to solve at least one of the above technical problems.

[0004] To achieve the above object, a method for constructing a three-dimensional model of an eccentric driven shaft cold water pipeline structure comprises the following steps: Step S1: obtaining an N-type eccentric driven shaft cold water pipeline structural assembly drawing, and performing component geometry analysis on the N-type eccentric driven shaft cold water pipeline structural assembly drawing to obtain a structural geometry parameter set corresponding to each eccentric driven shaft component, wherein the structural geometry parameter set includes a structural geometry size parameter, a structural geometry shape parameter, and a structural eccentric shaft position; performing a three-dimensional geometry construction on the N-type eccentric driven shaft cold water pipeline structural assembly drawing based on the structural geometry parameter set corresponding to each eccentric driven shaft component using the three-dimensional modeling software SOLIDWORKS to generate a geometric model of the N-type eccentric driven shaft cold water pipeline; Step S2: Import the geometric model of the N-type eccentric driven shaft cold water pipeline into the fluid flow simulation module corresponding to the fluid dynamics precision calculation software ANSYS FLUENT to determine the fluid domain corresponding to the eccentric driven shaft cold water pipeline structure as the standard The turbulence model is used to calculate the fluid Reynolds number to obtain the Reynolds number; by setting the boundary conditions of the cold water pipe inlet and outlet, the heat transfer coefficient, thermal radiation coefficient and heat source conditions between the end faces corresponding to the eccentric driven shaft components and the air and the environment, and performing thermal coupling simulation modeling on the geometric model of the cold water pipe of the N-type eccentric driven shaft, a thermal-fluid coupling simulation calculation model of the eccentric driven shaft is generated; Step S3: cross-grid the interface between the outer surface and the inner surface of the cold water pipe in the thermal-fluid coupling simulation calculation model of the eccentric driven shaft, and perform heat exchange working condition simulation analysis on the heat exchange process between the fluid flow inside and outside the cold water pipe and the solid components in the thermal-fluid coupling simulation calculation model of the eccentric driven shaft by setting the thermal-physical property parameters of the cold water pipe material and the working parameters of the main motor, so as to generate a heat exchange simulation process between the fluid domain inside and outside the cold water pipe and the solid domain; Step S4: using the fluid dynamics precision calculation software ANSYS FLUENT to set the convergence criteria, initialization function, solution controller and iteration time step, and using the second-order coupled implicit algorithm to perform heat exchange iterative convergence solution on the heat exchange simulation process between the fluid domain and the solid domain inside and outside the cold water pipe, so as to obtain the flow distribution of the cold water pipe fluid, the pressure distribution inside the cold water pipe and the heat transfer coefficient inside and outside the cold water pipe; obtaining the Prandtl number and the Nusselt number, and based on the Reynolds number, the Prandtl number and the Nusselt number, performing convective heat transfer deduction and analysis on the heat transfer coefficient inside and outside the cold water pipe, so as to obtain the convective heat transfer coefficient of the cold water pipe fluid; based on the flow distribution of the cold water pipe fluid, the pressure distribution inside the cold water pipe and the convective heat transfer coefficient of the cold water pipe fluid, using the post-processing software CFD Post to perform pipeline structure optimization design on the corresponding eccentric driven shaft cold water pipe structure, so as to generate the optimized structure of the eccentric driven shaft cold water pipe.

[0005] Further, step S1 includes the following steps: Step S11: obtaining an assembly drawing of a cold water pipeline structure of an N-type eccentric driven shaft; Step S12: accurately measuring the geometric dimensions of each eccentric driven shaft component in the N-type eccentric driven shaft cold water pipeline structure assembly drawing to obtain structural geometric dimension parameters corresponding to each eccentric driven shaft component, including the length, width and height corresponding to each eccentric driven shaft component; Step S13: obtaining the material physical properties corresponding to each eccentric driven shaft component, and performing a geometric shape refinement analysis on the corresponding eccentric driven shaft components in the N-type eccentric driven shaft cold water pipeline structure assembly drawing based on the material physical properties corresponding to each eccentric driven shaft component, so as to obtain the structural geometric shape parameters corresponding to each eccentric driven shaft component, including the shape size, shape curvature and shape surface flatness corresponding to each eccentric driven shaft component; Step S14: obtaining the structural layout and constraint relationship between each eccentric driven shaft component in the cold water pipeline structure through the N-type eccentric driven shaft cold water pipeline structure assembly drawing, and calculating the eccentric shaft position of the corresponding eccentric driven shaft component based on the structural layout and constraint relationship between each eccentric driven shaft component in the cold water pipeline structure, so as to obtain the structural eccentric shaft position corresponding to each eccentric driven shaft component; Step S15: Based on the structural geometric size parameters, structural geometric shape parameters and structural eccentric shaft positions corresponding to each eccentric driven shaft component, the 3D modeling software SOLIDWORKS is used to perform 3D geometric construction on the N-type eccentric driven shaft cold water pipeline structural assembly drawing to generate the N-type eccentric driven shaft cold water pipeline geometric model.

[0006] Furthermore, the eccentric shaft position calculation in step S14 is quantitatively calculated by a structural eccentric shaft position calculation formula, wherein the structural eccentric shaft position calculation formula is specifically: ; In the formula, For the The structural eccentric shaft position corresponding to each eccentric driven shaft component, is the total number of eccentric driven shaft components, is the total mass of the cold water pipe structure of the eccentric driven shaft, is the length of the cold water pipe, is the position variable parameter of the eccentric driven shaft, For the The eccentric driven shaft components are located in The corresponding structural force at For the The eccentric driven shaft components are located in The corresponding radial distance of the eccentric shaft is For the The eccentric driven shaft components are located in The corresponding eccentric shaft rotation angle is is the total number of constraints between the eccentric driven shaft components, For each eccentric driven shaft component The stiffness coefficient corresponding to the constraint is For each eccentric driven shaft component Constraints at location The corresponding structural deformation at is an exponential function, is the radial friction attenuation factor of the eccentric driven shaft components, is the correction factor for the eccentric shaft position of the structure.

[0007] Further, step S2 includes the following steps: Step S21: Import the N-type eccentric driven shaft cold water pipeline geometric model into the fluid flow simulation module corresponding to the fluid dynamics precision calculation software ANSYS FLUENT and set the fluid domain corresponding to the eccentric driven shaft cold water pipeline structure in the N-type eccentric driven shaft cold water pipeline geometric model as the standard Turbulence models; Step S22: Standard The turbulence model calculates the fluid Reynolds number to obtain the Reynolds number ,in Standard The fluid flow rate corresponding to the turbulence model, Standard The wall coefficient of the cold water pipe corresponding to the turbulence model, Standard The kinematic viscosity of the fluid corresponding to the turbulence model; Step S23: According to the standard corresponding to the geometric model of the cold water pipe of the N-type eccentric driven shaft The turbulence model obtains the fluid dynamics characteristics of the cold water pipeline, and the inlet and outlet boundary conditions of the N-type eccentric driven shaft cold water pipeline geometric model are set based on the fluid dynamics characteristics of the cold water pipeline to obtain the inlet and outlet boundary conditions of the cold water pipeline, including the flow velocity, temperature distribution and pressure distribution corresponding to the inlet and outlet of the cold water pipeline; Step S24: configuring a heat transfer model between air convection and environmental thermal radiation through the fluid dynamics precision calculation software ANSYS FLUENT, and performing thermal condition mapping setting for the corresponding eccentric driven shaft components in the N-type eccentric driven shaft cold water pipe geometric model based on the heat transfer model between air convection and environmental thermal radiation, so as to obtain the heat transfer coefficient, thermal radiation coefficient and heat condition of the heat source between the end surface corresponding to the eccentric driven shaft component and the air and the environment; Step S25: Based on the cold water pipe inlet and outlet boundary conditions, heat transfer coefficient, thermal radiation coefficient and heat source thermal conditions, a thermal coupling simulation model is performed on the N-type eccentric driven shaft cold water pipe geometric model to generate an eccentric driven shaft thermal-fluid coupling simulation calculation model.

[0008] Further, step S3 includes the following steps: Step S31: establishing an interface between the outer surface and the inner surface of the cold water pipe in the eccentric driven shaft thermal-fluid coupling simulation calculation model by using the fluid dynamics precision calculation software ANSYS FLUENT, so as to generate a binding interface between the fluid domain and the solid domain inside and outside the cold water pipe; Step S32: Based on the binding interface between the fluid domain and the solid domain inside and outside the cold water pipe, the fluid dynamics precision calculation software ANSYS FLUENT is used to set the corresponding overall meshing quality average value to perform cross meshing between the outer surface and the inner surface of the cold water pipe in the eccentric driven shaft thermal-fluid coupling simulation calculation model, so as to generate an eccentric driven shaft thermal-fluid coupling fluid-solid cross mesh model; Step S33: obtaining the working environment and actual working conditions corresponding to the cold water pipeline, and accurately setting the thermal physical parameters of the material used for the cold water pipeline in the eccentric driven shaft thermal-fluid coupled fluid-solid cross-grid model based on the working environment and actual working conditions corresponding to the cold water pipeline, so as to obtain the thermal physical parameters of the cold water pipeline material, including density, specific heat capacity, thermal conductivity and viscosity; Step S34: obtaining the main motor operating parameters corresponding to the cold water pipeline, including the main motor operating temperature, the main motor power output and the main motor heat load; Step S35: Based on the thermophysical properties of the cold water pipe material and the operating parameters of the main motor, the fluid dynamics precision calculation software ANSYS FLUENT is used to perform a heat exchange condition simulation analysis on the heat exchange process between the fluid flow inside and outside the cold water pipe and the solid components in the eccentric driven shaft thermal-fluid coupled fluid-solid cross-grid model, so as to generate a heat exchange simulation process between the fluid domain and the solid domain inside and outside the cold water pipe.

[0009] Furthermore, the average value of the overall meshing quality described in step S32 is specifically 0.82.

[0010] Further, step S4 includes the following steps: Step S41: using the fluid dynamics precision calculation software ANSYS FLUENT to set a convergence criterion, an initialization function, a solution controller, and an iteration time step for the heat exchange simulation process between the fluid domain and the solid domain inside and outside the cold water pipe; Step S42: Based on the convergence criterion, the initialization function, the solution controller and the iteration time step, the heat exchange simulation process between the fluid domain and the solid domain inside and outside the cold water pipe is solved by the second-order coupled implicit algorithm to obtain the fluid flow distribution of the cold water pipe, the pressure distribution inside the cold water pipe and the heat transfer coefficient inside and outside the cold water pipe; Step S43: Obtaining the Prandtl number and the Nusselt number; Step S44: Based on the Reynolds number, Prandtl number and Nusselt number, the convective heat transfer coefficient of the cold water pipe is derived and analyzed to obtain the convective heat transfer coefficient of the cold water pipe fluid. , ,in, is the Nusselt number, is the thermal conductivity of the fluid, is the inner diameter of the cold water pipe, is the heat transfer coefficient inside and outside the cold water pipe, is the Reynolds number, is the empirical constant of the flow state in the cold water pipeline, is the Prandtl number, is the empirical constant of the shape of the heat exchange surface inside and outside the cold water pipe; Step S45: Based on the fluid flow distribution of the cold water pipeline, the internal pressure distribution of the cold water pipeline, and the convective heat transfer coefficient of the fluid in the cold water pipeline, the post-processing software CFD Post is used to optimize the pipeline structure of the corresponding eccentric driven shaft cold water pipeline to generate an optimized structure of the eccentric driven shaft cold water pipeline.

[0011] Furthermore, the number of iterative time steps described in step S41 is Specifically, the convergence calculation results of the hot exchange iteration are saved every 10 steps, and a total of 1000 iterations are performed.

[0012] Furthermore, the second-order coupled implicit algorithm in step S42 is specifically: ; ; ; ; ; ; ; In the formula, is the velocity vector distribution of the fluid in the cold water pipe, is the density of the fluid in the cold water pipe, is the instantaneous time of the fluid in the cold water pipe, is the Laplace operator, is the pressure distribution inside the cold water pipe, is the dynamic viscosity of the cold water pipeline fluid, is the external force on the cold water pipe, For in time The heat exchange force item inside and outside the cold water pipe at is the temperature of the cold water pipe fluid, is the thermal conductivity of the cold water pipe fluid, For in time The internal heat source of the cold water pipe fluid domain at is the solid temperature of the cold water pipe, is the relative velocity vector distribution of the solid surface of the cold water pipe, is the solid thermal conductivity of the cold water pipe, is the heat exchange coefficient between the solid and fluid in the cold water pipe, For in time The solid internal heat source of the cold water pipe at For the The fluid flow distribution in the cold water pipe corresponding to the number of iteration time steps is: For the The fluid flow distribution in the cold water pipe corresponding to the number of iteration time steps is: is the number of iteration time steps, is the implicit update term for fluid dynamics, For the The temperature distribution of the cold water pipe fluid corresponding to the number of iteration time steps is: For the The temperature distribution of the cold water pipe fluid corresponding to the number of iteration time steps is: is the implicit update term for fluid heat exchange, is the fluid friction factor, is the length of the cold water pipe, is the inner diameter of the cold water pipe, is the heat transfer coefficient inside and outside the cold water pipe.

[0013] Further, step S45 includes the following steps: Step S451: using post-processing software CFD Post to draw a fluid flow vector distribution of the fluid flow distribution in the cold water pipeline to generate a fluid flow velocity vector distribution cloud map inside the cold water pipeline; Step S452: using post-processing software CFD Post to draw the pressure distribution inside the cold water pipeline to generate a pressure distribution cloud map inside the cold water pipeline; Step S453: using post-processing software CFD Post to draw the distribution of the convective heat transfer coefficient of the fluid in the cold water pipeline, so as to generate a distribution map of the convective heat transfer coefficient of the cold water pipeline; Step S454: performing distribution law recognition and analysis on the flow velocity vector distribution cloud map of the fluid inside the cold water pipe, the pressure distribution cloud map of the cold water pipe, and the convective heat transfer coefficient distribution map of the cold water pipe, so as to obtain the distribution law corresponding to the flow velocity of the fluid in the cold water pipe, the pressure inside the pipe, and the convective heat transfer coefficient; Step S455: Obtain the structural design optimization objectives corresponding to the uniform flow field, significant pressure drop and uniform convection coefficient distribution of the cold water pipe, and optimize the pipeline structure of the corresponding eccentric driven shaft cold water pipe structure based on the distribution law corresponding to the fluid flow rate of the cold water pipe, the pressure in the pipe and the convection heat transfer coefficient using the structural design optimization objectives to generate the optimized structure of the eccentric driven shaft cold water pipe.

[0014] Beneficial effects of the present invention: Compared with the prior art, the three-dimensional model construction method of the eccentric driven shaft cold water pipeline structure proposed in the present invention has the beneficial effect that by obtaining the design assembly drawing corresponding to the N-type eccentric driven shaft cold water pipeline structure, the layout of the entire cold water pipeline structure, the positional relationship of each component and the functional requirements can be clearly understood, which is helpful for the subsequent accurate measurement, modeling and analysis of each component, ensuring the smooth progress and optimization of the entire design process. By performing component geometry analysis on each eccentric driven shaft component in the N-type eccentric driven shaft cold water pipeline structure assembly drawing, the specific size information of each component can be obtained. Accurate geometric dimension measurement can not only help designers confirm the size, shape and proportion of the components, but also help discover errors or interferences in the assembly process, ensuring that the components will not be misplaced or interfered during the working process, thereby avoiding potential problems in the operation of the cold water pipeline structure and improving the performance and reliability of the entire cold water pipeline structure. At the same time, by using the 3D modeling software SOLIDWORKS to perform 3D geometric construction on the N-type eccentric driven shaft cold water pipe structure assembly drawing, it is possible to more intuitively observe the geometric shape, size and relative position of the parts, and discover existing design defects or unreasonableness in advance. In the process of 3D modeling, the design can be modified and optimized in real time, thereby reducing errors and uncertainties in traditional design. Through software such as SOLIDWORKS, designers can also perform virtual assembly and interference checks to ensure that there are no conflicts between parts during the actual assembly process. The 3D model can also be used as a basis for manufacturing and processing to help manufacturers accurately manufacture parts, reduce errors, and improve production efficiency. 3D modeling not only improves the accuracy and visualization of the design, but also can effectively simulate the actual operating status of the cold water pipe structure. Secondly, by importing the geometric model of the N-type eccentric driven shaft cold water pipe into the fluid dynamics precision calculation software ANSYSFLUENT, the fluid domain of the model is confirmed, and a suitable one is selected for it. Turbulence model, and calculate the fluid Reynolds number to obtain the Reynolds number. This step of calculating the Reynolds number of the fluid is the key to ensuring the correct simulation of the fluid flow behavior. The Reynolds number is a key indicator to determine whether the fluid flow is turbulent. It is usually calculated by the fluid flow rate, wall coefficient and fluid kinematic viscosity. By calculating the Reynolds number, the flow state of the fluid in the N-type eccentric driven shaft cold water pipe can be obtained, so as to decide whether the turbulence parameters in the model should be adjusted or the simulation settings should be optimized. This step can help engineers accurately understand the flow characteristics of the fluid and determine whether it is in the turbulent range, ensuring the accuracy and reliability of the thermal-fluid coupling model. By setting the inlet and outlet boundary conditions of the cold water pipe and the heat transfer coefficient, thermal radiation coefficient and heat condition of the heat source between the end faces of the eccentric driven shaft components and the air and the environment, and performing thermal coupling simulation modeling on the geometric model of the N-type eccentric driven shaft cold water pipe, this process closely combines the fluid dynamics characteristics of the cold water pipe with the heat conduction process to generate a comprehensive calculation model including temperature changes, heat flow distribution and heat transfer effects. Through thermal-fluid coupling simulation, the heat transfer performance and fluid dynamics performance of the N-type eccentric driven shaft cold water pipe under different operating conditions can be comprehensively evaluated. By combining fluid flow and heat transfer simulation, the temperature distribution, pressure changes and flow state of the system can be better predicted and optimized, thereby improving the design efficiency and operating stability of the system, and helping to develop a more efficient and reliable cooling system. Then, by cross-gridding the interface between the outer surface and the inner surface of the cold water pipe in the eccentric driven shaft thermal-fluid coupling simulation model, accurate coupling between the fluid domain and the solid domain inside and outside the cold water pipe can be achieved. Meshing is the basis of computational fluid dynamics (CFD) simulation. The degree of mesh refinement directly affects the accuracy and stability of the simulation results. It can not only effectively capture the details of heat exchange between fluid flow and solid surface, but also handle the complex geometry of the cold water pipe and the thermal flow characteristics of the eccentric driven shaft, so that it can more accurately predict heat load transfer, flow behavior and temperature distribution. The optimized meshing can significantly improve the calculation efficiency and reduce the calculation time, while avoiding the result errors caused by uneven or too rough meshes, providing strong support for efficient and accurate thermal-fluid coupling analysis.By setting the thermophysical properties of the cold water pipe material and the working parameters of the main motor, the heat exchange working condition simulation analysis of the heat exchange process between the fluid flow inside and outside the cold water pipe and the solid components in the eccentric driven shaft thermal flow coupling simulation calculation model is carried out. Accurate simulation of the heat exchange process is crucial to predicting the working state of the cold water pipe, especially in special design cases such as eccentric driven shafts. The heat transfer between fluid and solid often has strong nonlinear characteristics. By comprehensively considering the fluid dynamics and heat transfer process, the simulation analysis can reveal the heat exchange performance of the cold water pipe under different working conditions, such as heat load distribution, temperature gradient changes, flow resistance, etc. This not only provides detailed data support for the design of the cold water pipe, but also can comprehensively consider the changes in fluid flow and temperature distribution caused by the eccentric shaft. Finally, the convergence criteria, initialization function, solution controller and iterative time step are set through the fluid dynamics precision calculation software ANSYS FLUENT, and the heat exchange iterative convergence solution is performed on the heat exchange simulation process between the fluid domain and the solid domain inside and outside the cold water pipe using the second-order coupled implicit algorithm. The second-order coupled implicit algorithm is applied to the heat exchange simulation between the fluid and solid domain inside and outside the cold water pipe. The advantage of the implicit algorithm is that it can still maintain stability when the time step is large, so as to accurately solve the complex flow and heat exchange process. Through the iterative solution process, the key parameters such as the fluid flow distribution, internal pressure distribution and heat transfer coefficient of the cold water pipe can be obtained. Through repeated iterations and convergence, the obtained fluid flow, pressure distribution and heat exchange coefficient data can provide a scientific basis for the subsequent pipeline optimization design. The convective heat transfer coefficient of the cold water pipe is derived by obtaining the Prandtl number and the Nusselt number and combining them with the Reynolds number. This coefficient directly affects the efficiency of heat transfer from the cold water fluid to the pipe wall and from the pipe wall to the external environment. The heat exchange performance of the cold water pipe is further derived and optimized through the calculation formula. In addition, the corresponding eccentric driven shaft cold water pipe structure is optimized by using the post-processing software CFD Post based on the flow distribution of the cold water pipe fluid, the pressure distribution inside the cold water pipe, and the convective heat transfer coefficient of the cold water pipe fluid. In CFD Post, the fluid flow, temperature field, pressure field and other data in the pipe can be intuitively viewed through visualization tools to help designers identify potential flow dead zones, areas with excessive pressure drop or low heat transfer efficiency. Based on these analysis results, the optimized design can improve the fluid dynamic performance of the cold water pipe, thereby improving the precision and accuracy of the three-dimensional modeling design results. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Other features, objects and advantages of the present invention will become more apparent from the detailed description of non-limiting embodiments thereof made with reference to the following drawings: Figure 1 A schematic flow chart of the steps of a method for constructing a three-dimensional model of a cold water pipeline structure of an eccentric driven shaft according to the present invention; Figure 2 for Figure 1 Detailed step flow chart of step S1 in FIG. DETAILED DESCRIPTION

[0016] The technical method of the present invention is described clearly and completely below in conjunction with the accompanying drawings. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by technicians in this field without creative work are within the scope of protection of the present invention.

[0017] To achieve this, please refer to Figure 1 to Figure 2 The present invention provides a method for constructing a three-dimensional model of an eccentric driven shaft cold water pipe structure. In the embodiment of the present invention, please refer to Figure 1 FIG. 1 is a schematic diagram of the steps of the method for constructing a three-dimensional model of a cooling water pipe structure of an eccentric driven shaft according to the present invention. In this example, the method for constructing a three-dimensional model of a cooling water pipe structure of an eccentric driven shaft includes the following steps: Step S1: obtaining an N-type eccentric driven shaft cold water pipeline structural assembly drawing, and performing component geometry analysis on the N-type eccentric driven shaft cold water pipeline structural assembly drawing to obtain a structural geometry parameter set corresponding to each eccentric driven shaft component, wherein the structural geometry parameter set includes a structural geometry size parameter, a structural geometry shape parameter, and a structural eccentric shaft position; performing a three-dimensional geometry construction on the N-type eccentric driven shaft cold water pipeline structural assembly drawing based on the structural geometry parameter set corresponding to each eccentric driven shaft component using the three-dimensional modeling software SOLIDWORKS to generate a geometric model of the N-type eccentric driven shaft cold water pipeline; In an embodiment of the present invention, an N-type eccentric driven shaft cold water pipeline structure assembly drawing is obtained according to design requirements and system requirements. This drawing should be a standard CAD format file, such as DWG, DXF and other formats, which can provide a complete pipeline system and the spatial position, connection relationship and size of each component of the eccentric driven shaft, thereby obtaining an N-type eccentric driven shaft cold water pipeline structure assembly drawing. By accurately measuring the geometric dimensions of each component in the obtained N-type eccentric driven shaft cold water pipeline structure assembly drawing, the drawing can be enlarged and viewed in detail by using professional CAD software (such as AutoCAD), and the length, width and height of each component are measured one by one by using the measurement tools in the software (such as distance measurement, angle measurement and other functions), thereby obtaining the length, width and height corresponding to each eccentric driven shaft component. According to the material types of the components marked in the cold water pipe assembly drawing of the N-type eccentric driven shaft, the material physical properties of each component, such as density, elastic modulus, tensile strength, thermal expansion coefficient, etc., are collected, and the geometric shapes of the components are finely analyzed based on these characteristics. This analysis can be achieved through finite element analysis (FEA) software. According to the geometric dimensions of each component, its deformation, stress distribution and thermal expansion and contraction effects under the working conditions of the cold water pipe are simulated. Through these analyses, the geometric shapes of the components are further optimized to generate accurate geometric shape parameters, including shape size, shape curvature, surface flatness, etc. The relative position and constraint relationship of each component are determined based on the cold water pipe structure assembly drawing of the N-type eccentric driven shaft. The specific steps include analyzing the connection method (such as welding, bolt connection, etc.), relative position (such as eccentric angle, distance, etc.) and force transmission path of each component in the drawing. On this basis, the calculation Calculate the eccentric shaft position of each component. The position of the eccentric shaft refers to the position of the eccentric driven shaft relative to the central axis of other components. Then, after completing the above steps, use the 3D modeling software SOLIDWORKS to perform 3D geometric construction on the N-type eccentric driven shaft cold water pipeline structure assembly drawing. First, input the previously obtained geometric size parameters and geometric shape parameters into SOLIDWORKS, and set the spatial coordinates of the components according to the calculated eccentric shaft position. Through the modeling tools of SOLIDWORKS, gradually build the 3D model of each component, including pipelines, eccentric driven shafts and other auxiliary components. During the construction process, use the assembly function in SOLIDWORKS to ensure that the relative positions and constraint relationships of each component meet the design requirements. Through the precise splicing and assembly of components, a complete 3D cold water pipeline structure model is generated, and finally a geometric model of the N-type eccentric driven shaft cold water pipeline is constructed.

[0018] Step S2: Import the geometric model of the N-type eccentric driven shaft cold water pipeline into the fluid flow simulation module corresponding to the fluid dynamics precision calculation software ANSYS FLUENT to determine the fluid domain corresponding to the eccentric driven shaft cold water pipeline structure as the standard The turbulence model is used to calculate the fluid Reynolds number to obtain the Reynolds number; by setting the boundary conditions of the cold water pipe inlet and outlet, the heat transfer coefficient, thermal radiation coefficient and heat source conditions between the end faces corresponding to the eccentric driven shaft components and the air and the environment, and performing thermal coupling simulation modeling on the geometric model of the cold water pipe of the N-type eccentric driven shaft, a thermal-fluid coupling simulation calculation model of the eccentric driven shaft is generated; In an embodiment of the present invention, a previously established N-type eccentric driven shaft cold water pipeline geometry model is imported into the fluid dynamics precision calculation software ANSYS FLUENT, a CAD modeling software (such as SolidWorks or AutoCAD) is used to construct a three-dimensional geometry model of the N-type eccentric driven shaft cold water pipeline, and a new project is created in ANSYS Workbench, the geometry model is imported and a fluid domain is defined in a fluid flow simulation module, and the inner and outer surfaces of the pipeline and the corresponding boundary conditions are defined to ensure that the geometry of the model is completely consistent with the actual pipeline structure, and an appropriate fluid domain is selected for regional division to ensure that the flow area is accurately matched with the space in the pipeline, and then, a standard is selected. The turbulence model is used as the fluid flow simulation model of the pipeline and the Reynolds number is calculated. First, according to the known fluid flow , cold water pipe wall coefficient and fluid kinematic viscosity , using the formula Calculate the Reynolds number R. The calculation result can provide an important basis for the subsequent fluid turbulence simulation. The flow rate Q is usually determined by the working conditions of the system. The wall coefficient Y is obtained by analyzing the friction characteristics of the inner surface of the pipe and the flow velocity distribution. The kinematic viscosity μ is determined by the temperature and properties of the fluid. The size of the Reynolds number R can be used to judge the flow state and can be determined by the standard The fluid dynamics characteristics calculated by the turbulence model are used to further set the inlet and outlet boundary conditions of the cold water pipe of the N-type eccentric driven shaft, so as to set the flow rate, pressure and temperature distribution of the pipe inlet and outlet by using the built-in fluid simulation tool of ANSYS FLUENT, so as to obtain the inlet and outlet boundary conditions of the cold water pipe. At the same time, by configuring the heat transfer model between air convection and environmental thermal radiation in ANSYS FLUENT to simulate the heat exchange process between the cold water pipe and the environment, select a suitable heat transfer model (such as natural convection or forced convection), and set the heat transfer coefficient and thermal radiation coefficient between air and the environment in the model. On this basis, set the thermal condition mapping for the components of the N-type eccentric driven shaft (such as eccentric bearings, etc.), map the heat flow distribution, radiation heat dissipation and other factors to the corresponding parts, so as to set the heat transfer coefficient, thermal radiation coefficient and heat source heat condition between the end face corresponding to the eccentric driven shaft components and the air and the environment. Then, based on the aforementioned set inlet and outlet boundary conditions and heat exchange coefficient, the thermal-fluid coupling simulation modeling of the cold water pipe is carried out. In ANSYS FLUENT, the thermal-fluid coupling method is used to combine the fluid flow and heat transfer model. This process requires consideration of the thermophysical properties of the fluid, such as specific heat, thermal conductivity, etc., to ensure that the mutual influence of heat and flow is accurately reflected in the simulation. By modeling the heat exchange process between the fluid in the cold water pipe and the components, an accurate thermal-fluid coupling simulation calculation model can be generated, and finally a thermal-fluid coupling simulation calculation model of the eccentric driven shaft is generated.

[0019] Step S3: cross-grid the interface between the outer surface and the inner surface of the cold water pipe in the thermal-fluid coupling simulation calculation model of the eccentric driven shaft, and perform heat exchange working condition simulation analysis on the heat exchange process between the fluid flow inside and outside the cold water pipe and the solid components in the thermal-fluid coupling simulation calculation model of the eccentric driven shaft by setting the thermal-physical property parameters of the cold water pipe material and the working parameters of the main motor, so as to generate a heat exchange simulation process between the fluid domain inside and outside the cold water pipe and the solid domain; In an embodiment of the present invention, when performing a thermal-fluid coupling simulation of a cold water pipe of an eccentric driven shaft, the interface between the outer surface and the inner surface of the cold water pipe is first established by using the fluid dynamics precision calculation software ANSYS FLUENT to ensure that all relevant components of the eccentric driven shaft and the cold water pipe are included in the model. Next, the outer surface and the inner surface of the cold water pipe are defined, and the coupling interface between the fluid and the solid domain is used to ensure the correct binding of the fluid domain and the solid domain. The binding interface between the fluid domain and the solid domain inside and outside the cold water pipe that has been established previously is combined and the fluid dynamics precision calculation software ANSYS is used. FLUENT sets the corresponding average value of the overall meshing quality, which is specifically 0.82, to meet the calculation conditions, and cross-grids the outer and inner surfaces of the corresponding cold water pipes to select the meshing module and set the global mesh parameter of the model to 0.82, determine the mesh type (such as structured mesh or unstructured mesh) and mesh density, and according to the complexity of the cold water pipe and the geometric characteristics of the eccentric driven shaft, use unstructured mesh to adapt to the complex shape, while ensuring that the mesh quality at the interface is uniform, including the corresponding meshes of the fluid domain and the solid domain to meet the accuracy requirements of the thermal-fluid coupling simulation calculation of the eccentric driven shaft. After completing the meshing, it is necessary to set the material thermal physical properties of the cold water pipe according to the actual working conditions and working environment. First, by collecting the working environment data of the cold water pipe, including parameters such as ambient temperature, pressure and flow rate, combined with the cooling requirements in actual applications, the physical properties of the cold water pipe are accurately set. In specific operations, the material of the cold water pipe (such as stainless steel, copper or composite materials, etc.) is in ANSYS In FLUENT, the thermophysical parameters of different materials need to be set according to their types. By inputting the physical properties of the cold water pipe material, such as density, specific heat capacity, thermal conductivity and viscosity, ensure that these parameters are consistent with the actual working environment of the cold water pipe. For example, when setting the thermophysical properties of stainless steel in the simulation, its density (7850 ), specific heat capacity (500 J / kg·K), thermal conductivity (15 W / m·K) and viscosity (1.5 mPa·s). At the same time, when obtaining the working parameters of the main motor of the system where the cold water pipeline is located, it is necessary to first analyze the actual working environment of the cold water pipeline, especially the operation of the main motor. These parameters are usually obtained through the factory on-site monitoring system or equipment manual. Specifically, first determine the operating temperature of the main motor and record the power output of the main motor. In addition, the thermal load of the motor is also a key parameter, which is usually calculated by the difference between the power input and output power of the motor, so as to obtain the corresponding main motor working parameters. Then, based on the material thermophysical parameters of the cold water pipe and the working parameters of the main motor obtained in the previous steps, the heat exchange simulation analysis stage of the thermal-fluid coupling simulation calculation model of the eccentric driven shaft is entered. In the specific implementation, the thermal-fluid coupling module of ANSYS FLUENT is used to simulate the heat exchange process of the cold water pipe. The flow rate, temperature and other fluid dynamics parameters of the working fluid (such as cooling water) of the cold water pipe are set in the model, and the temperature field and flow field are calculated in combination with the thermophysical parameters of the material. During the simulation process, the thermal load of the main motor and the fluid temperature around the cold water pipe are combined to gradually perform multi-physical field coupling simulation to simulate the heat exchange process of the fluid inside and outside the cold water pipe, and finally generate the heat exchange simulation process between the fluid domain and the solid domain inside and outside the cold water pipe.

[0020] Step S4: using the fluid dynamics precision calculation software ANSYS FLUENT to set the convergence criteria, initialization function, solution controller and iteration time step, and using the second-order coupled implicit algorithm to perform heat exchange iterative convergence solution on the heat exchange simulation process between the fluid domain and the solid domain inside and outside the cold water pipe, so as to obtain the flow distribution of the cold water pipe fluid, the pressure distribution inside the cold water pipe and the heat transfer coefficient inside and outside the cold water pipe; obtaining the Prandtl number and the Nusselt number, and based on the Reynolds number, the Prandtl number and the Nusselt number, performing convective heat transfer deduction and analysis on the heat transfer coefficient inside and outside the cold water pipe, so as to obtain the convective heat transfer coefficient of the cold water pipe fluid; based on the flow distribution of the cold water pipe fluid, the pressure distribution inside the cold water pipe and the convective heat transfer coefficient of the cold water pipe fluid, using the post-processing software CFD Post to perform pipeline structure optimization design on the corresponding eccentric driven shaft cold water pipe structure, so as to generate the optimized structure of the eccentric driven shaft cold water pipe.

[0021] In the embodiment of the present invention, ANSYS FLUENT is used to simulate and analyze the heat exchange between the fluid domain and the solid domain inside and outside the cold water pipe. First, various parameters in the simulation process need to be set and initialized. At this time, through the graphical user interface of ANSYS FLUENT, the corresponding physical model is selected to enter the solution setting interface. Setting the convergence criterion is a key step to ensure that the numerical calculation can converge stably. Usually, the residual size and the convergence criteria of multiple physical quantities such as mass, momentum, and energy are selected. The residual value is generally set to Next, the setting of the initialization function is crucial before the model solution begins. The standard initialization method is usually used to initialize the initial temperature, velocity, pressure, etc. of the fluid domain and the solid domain to ensure that the iteration starts from a reasonable initial state. The solution controller setting determines the type of solver and its calculation accuracy. Usually, a pressure-based solver is selected, and a pressure-velocity coupling method such as SIMPLE or SIMPLEC is used. The appropriate number of iteration time steps is set according to the size of the cold water pipe and the fluid conditions. , usually a stable step size based on the flow rate of the cold water pipe is selected, specifically, the heat exchange iterative convergence calculation results are saved every 10 steps, and a total of 1000 iterations are performed to set the corresponding convergence criteria, initialization function, solution controller and iteration time step. Secondly, in the heat exchange simulation between the fluid domain and the solid domain inside and outside the cold water pipe, the previously set convergence criteria, initialization function, solution controller and iteration time step are combined and the heat exchange process is iteratively solved using the second-order coupled implicit algorithm. At this time, using the solution function of ANSYS FLUENT, after setting appropriate boundary conditions and initial conditions, the heat exchange simulation process is started. The second-order coupled implicit algorithm can accurately capture the heat transfer between the fluid and solid domains, ensuring the stability and efficiency of the calculation. During the iterative convergence process, the focus is on observing the changes in the fluid flow distribution, the pressure distribution inside the pipe, and the heat transfer coefficient inside and outside the cold water pipe. In each iteration, ANSYS FLUENT calculates the velocity field, pressure field and temperature field of the fluid, updates the solution results, and gradually approaches the real heat exchange state. Once the convergence criteria meet the set standards (for example, the residual is less than ), the simulation process is considered to have converged, and the fluid flow distribution in the cold water pipe, the pressure distribution inside the cold water pipe, and the heat transfer coefficient inside and outside the cold water pipe are obtained. At the same time, the Prandtl number (Pr) and Nusselt number (Nu) are calculated and obtained according to the flow conditions and heat exchange characteristics of the cold water pipe. The Prandtl number is a dimensionless value that describes the relative strength of the viscous diffusion and thermal diffusion of the fluid. It is usually calculated by the specific heat capacity, viscosity and thermal conductivity of the fluid. The Nusselt number is a dimensionless value that describes the convective heat transfer capacity of the fluid. It is closely related to the Prandtl number and the Reynolds number. Commonly used empirical formulas such as the Dittus-Boelter formula are used to calculate the Nusselt number under turbulent conditions. After obtaining the Prandtl number (Pr) and the Nusselt number (Nu), the convective heat transfer coefficient is deduced using the heat exchange analysis formula. First, according to the flow state of the cold water pipe (such as turbulent or laminar flow), a suitable empirical formula is selected to derive the convective heat transfer coefficient inside and outside the cold water pipe. Specifically, based on the Reynolds number, Prandtl number and Nusselt number of the fluid, the classic convective heat transfer relationship is used. To analyze, is the Nusselt number, specifically , is the heat transfer coefficient inside and outside the cold water pipe, is the Reynolds number, is the Prandtl number, and are empirical constants based on the flow state. On this basis, combined with the thermal conductivity of the fluid and the inner diameter of the pipe, the convective heat transfer coefficient of the cold water pipe can be further derived, thereby obtaining the convective heat transfer coefficient of the cold water pipe fluid. Then, after obtaining the flow distribution, pressure distribution and convective heat transfer coefficient of the cold water pipeline, the pipeline structure optimization design stage is entered. At this time, the post-processing software CFD Post is used for three-dimensional modeling optimization analysis. First, according to the heat exchange conditions and fluid distribution inside and outside the cold water pipeline, the three-dimensional model distribution cloud map of the eccentric driven shaft cold water pipeline is established through CFD Post, and the geometric dimensions are adjusted and optimized. In the specific operation process, the basic geometric parameters of the cold water pipeline, such as the inner diameter, outer diameter and wall thickness of the pipeline, are first input, and then the fluid mechanics parameters of the pipeline under different flow conditions (such as flow rate, pressure, temperature, etc.) are input, and CFD Post is used to post-process the flow field and thermal field of the pipeline, and the influence of different geometric shapes on fluid flow and heat exchange efficiency is analyzed. By gradually adjusting the geometric shape and structure of the pipeline, the fluid dynamics performance of the pipeline is optimized, and the optimized eccentric driven shaft cold water pipeline structure model is generated. This model can be further used in actual production or experimental verification to ensure that the pipeline design has better heat exchange performance and fluid flow efficiency, and finally the eccentric driven shaft cold water pipeline optimized structure is generated.

[0022] Further, as an embodiment of the present invention, refer to Figure 2 As shown, Figure 1 Detailed step flow diagram of step S1 in FIG. 1 , in this embodiment, step S1 includes the following steps: Step S11: obtaining an assembly drawing of a cold water pipeline structure of an N-type eccentric driven shaft; In an embodiment of the present invention, an assembly drawing of the cold water pipe structure of an N-type eccentric driven shaft is obtained according to design requirements and system requirements. This drawing should be a standard CAD format file, such as DWG, DXF and other formats, which can provide the spatial position, connection relationship and size of each component of a complete piping system and an eccentric driven shaft. When obtaining the assembly drawing, it is necessary to ensure the clarity of the scale, legend, annotation and view of the drawing to facilitate subsequent precise measurement and modeling. If the drawing is in paper form, a scanner can be used to digitize it and convert it into an editable image file, which can then be imported through CAD software and digitally repaired to ensure that every detail is correct, and finally the assembly drawing of the cold water pipe structure of the N-type eccentric driven shaft is obtained.

[0023] Step S12: accurately measuring the geometric dimensions of each eccentric driven shaft component in the N-type eccentric driven shaft cold water pipeline structure assembly drawing to obtain structural geometric dimension parameters corresponding to each eccentric driven shaft component, including the length, width and height corresponding to each eccentric driven shaft component; In an embodiment of the present invention, by accurately measuring the geometric dimensions of each component in the obtained N-type eccentric driven shaft cold water pipe structure assembly drawing, the drawing can be enlarged and viewed in detail by using professional CAD software (such as AutoCAD), and the measuring tools in the software (such as distance measurement, angle measurement and other functions) are used to measure the length, width and height of each component one by one, and special attention is paid to the connection position of the components, the position of the center line of the eccentric shaft and the relative size relationship of each component to ensure that no important parameters are missed during the measurement process. Through careful measurement, the standard geometric dimensions of each component are obtained and recorded in a special measurement data table, and finally the structural geometric dimension parameters corresponding to each eccentric driven shaft component are obtained, including the length, width and height corresponding to each eccentric driven shaft component.

[0024] Step S13: obtaining the material physical properties corresponding to each eccentric driven shaft component, and performing a geometric shape refinement analysis on the corresponding eccentric driven shaft components in the N-type eccentric driven shaft cold water pipeline structure assembly drawing based on the material physical properties corresponding to each eccentric driven shaft component, so as to obtain the structural geometric shape parameters corresponding to each eccentric driven shaft component, including the shape size, shape curvature and shape surface flatness corresponding to each eccentric driven shaft component; In an embodiment of the present invention, the material physical properties of each component, such as density, elastic modulus, tensile strength, thermal expansion coefficient, etc., are collected according to the material type of the components marked in the N-type eccentric driven shaft cold water pipeline assembly drawing. These data can usually be obtained through a material manual or a related material database. If they cannot be obtained directly, it is necessary to communicate with the relevant material supplier. After obtaining the physical properties of the material, the geometric shape of the component is refined based on these properties. This analysis can be achieved through finite element analysis (FEA) software. According to the geometric dimensions of each component, its deformation, stress distribution and thermal expansion and contraction effects under the working conditions of the cold water pipeline are simulated. Through these analyses, the geometric shape of the component is further optimized to ensure that it adapts to the actual working environment and achieves ideal mechanical properties, durability and stability, thereby generating accurate geometric shape parameters, including shape size, shape curvature, surface flatness, etc., and finally obtaining the structural geometric shape parameters corresponding to each eccentric driven shaft component, including the shape size, shape curvature and shape surface flatness corresponding to each eccentric driven shaft component.

[0025] Step S14: obtaining the structural layout and constraint relationship between each eccentric driven shaft component in the cold water pipeline structure through the N-type eccentric driven shaft cold water pipeline structure assembly drawing, and calculating the eccentric shaft position of the corresponding eccentric driven shaft component based on the structural layout and constraint relationship between each eccentric driven shaft component in the cold water pipeline structure, so as to obtain the structural eccentric shaft position corresponding to each eccentric driven shaft component; In an embodiment of the present invention, the relative position and constraint relationship of each component is determined based on the N-type eccentric driven shaft cold water pipeline structure assembly drawing. The specific steps include analyzing the connection method (such as welding, bolt connection, etc.), relative position (such as eccentric angle, distance, etc.) and force transmission path of each component in the drawing. On this basis, the eccentric shaft position of each component is calculated. The position of the eccentric shaft refers to the position of the central axis of the eccentric driven shaft relative to other components. The fluid dynamics characteristics in the pipeline and the relative movement of the components need to be considered. Mathematical models and engineering calculation tools (such as MATLAB or dedicated pipeline design software) can be used to calculate the eccentric shaft position of each component to obtain accurate spatial coordinates. This step ensures that the relative position of each component is accurate during subsequent modeling, ensures that the eccentric shaft design meets engineering requirements, and finally obtains the structural eccentric shaft position corresponding to each eccentric driven shaft component.

[0026] Step S15: Based on the structural geometric size parameters, structural geometric shape parameters and structural eccentric shaft positions corresponding to each eccentric driven shaft component, the 3D modeling software SOLIDWORKS is used to perform 3D geometric construction on the N-type eccentric driven shaft cold water pipeline structural assembly drawing to generate the N-type eccentric driven shaft cold water pipeline geometric model.

[0027] In an embodiment of the present invention, after completing the aforementioned steps, the 3D modeling software SOLIDWORKS is used to perform 3D geometric construction on the N-type eccentric driven shaft cold water pipeline structure assembly drawing. First, the previously obtained geometric size parameters and geometric shape parameters are input into SOLIDWORKS, and the spatial coordinates of the parts are set according to the calculated eccentric shaft position. The 3D model of each part is gradually constructed through the modeling tool of SOLIDWORKS, including the pipeline, the eccentric driven shaft and other auxiliary components. During the construction process, the assembly function in SOLIDWORKS is used to ensure that the relative position and constraint relationship of each part meet the design requirements. Through the precise splicing and assembly of the parts, a complete 3D cold water pipeline structure model is generated. The 3D model is simulated and tested through the analysis module of SOLIDWORKS to verify its performance in actual work and ensure the reliability and practicality of the model. If necessary, the model parameters are further optimized and the design defects are corrected, thereby completing the 3D geometric model construction of the N-type eccentric driven shaft cold water pipeline, and finally constructing the N-type eccentric driven shaft cold water pipeline geometric model.

[0028] Furthermore, the eccentric shaft position calculation in step S14 is quantitatively calculated by a structural eccentric shaft position calculation formula, wherein the structural eccentric shaft position calculation formula is specifically: ; In the formula, For the The structural eccentric shaft position corresponding to each eccentric driven shaft component, is the total number of eccentric driven shaft components, is the total mass of the cold water pipe structure of the eccentric driven shaft, is the length of the cold water pipe, is the position variable parameter of the eccentric driven shaft, For the The eccentric driven shaft components are located in The corresponding structural force at For the The eccentric driven shaft components are located in The corresponding radial distance of the eccentric shaft is For the The eccentric driven shaft components are located in The corresponding eccentric shaft rotation angle is is the total number of constraints between the eccentric driven shaft components, For each eccentric driven shaft component The stiffness coefficient corresponding to the constraint is For each eccentric driven shaft component Constraints at location The corresponding structural deformation at is an exponential function, is the radial friction attenuation factor of the eccentric driven shaft components, is the correction factor for the eccentric shaft position of the structure.

[0029] The present invention obtains a structural eccentric shaft position calculation formula by using a specific mathematical model and verifying it, which is used to calculate the eccentric shaft position of the corresponding eccentric driven shaft component. The structural eccentric shaft position calculation formula comprehensively considers the structural force, radial distance, rotation angle and mutual constraints of each component, so that the calculation of the eccentric shaft position is more accurate. Such accuracy is crucial to ensure the stability and safety of the entire cold water pipe system. The integrated calculation method is adopted to consider the influence of multiple factors, including the physical properties of the material, the geometric characteristics of the components and the interaction between them. This comprehensive analysis can provide a more comprehensive design basis. The eccentric shaft position obtained by calculation can provide data support for design optimization, which can help engineers to timely discover and modify potential unreasonable designs in the design stage, thereby improving the performance of the overall structure. The consideration of morphological parameters and constraint relationships introduced in the calculation formula enables detailed shape and layout analysis to be performed at the beginning of the design, avoiding unnecessary modifications caused by inappropriate shapes in the later stage. Through the accurate calculation of the eccentric shaft position, the strength performance of the structure under various working conditions can be better analyzed. In summary, the formula fully considers the first The corresponding structural eccentric shaft position of the eccentric driven shaft components , the total number of eccentric driven shaft parts , Total mass of the eccentric driven shaft cooling water pipe structure , cold water pipe length , eccentric driven shaft position variable parameters , No. The eccentric driven shaft components are located in The corresponding structural force , No. The eccentric driven shaft components are located in The corresponding radial distance of the eccentric shaft , No. The eccentric driven shaft components are located in The corresponding eccentric shaft rotation angle , the total number of constraints between the eccentric driven shaft components , the first The stiffness coefficient corresponding to the constraint , the first Constraints at location The corresponding structural deformation , exponential function , radial friction attenuation factor of eccentric driven shaft components , correction factor for the eccentric shaft position of the structure , according to The corresponding structural eccentric shaft position of the eccentric driven shaft components The correlation between the above parameters forms a functional relationship: ; This formula can realize the calculation process of the eccentric shaft position of the corresponding eccentric driven shaft parts. At the same time, the correction coefficient of the eccentric shaft position is calculated by the structure. The introduction of can be adjusted according to the error conditions that occur during the calculation process, thereby improving the accuracy and applicability of the calculation formula for the eccentric shaft position of the structure.

[0030] Further, step S2 includes the following steps: Step S21: Import the N-type eccentric driven shaft cold water pipeline geometric model into the fluid flow simulation module corresponding to the fluid dynamics precision calculation software ANSYS FLUENT and set the fluid domain corresponding to the eccentric driven shaft cold water pipeline structure in the N-type eccentric driven shaft cold water pipeline geometric model as the standard Turbulence models; In an embodiment of the present invention, by importing the previously established N-type eccentric driven shaft cold water pipeline geometric model into the fluid dynamics precision calculation software ANSYS FLUENT, first use CAD modeling software (such as SolidWorks or AutoCAD) to build the three-dimensional geometric model of the N-type eccentric driven shaft cold water pipeline, then create a new project in ANSYS Workbench, import the geometric model and define the fluid domain in the fluid flow simulation module, and by defining the inner and outer surfaces of the pipeline and the corresponding boundary conditions, ensure that the geometric shape of the model is completely consistent with the actual pipeline structure, select an appropriate fluid domain for regional division, ensure that the flow area is accurately matched with the space in the pipeline, and then select the standard The turbulence model, as the fluid flow simulation model of the pipeline, can provide sufficient accuracy to describe the turbulence phenomenon in the N-type eccentric driven shaft cold water pipeline.

[0031] Step S22: Standard The turbulence model calculates the fluid Reynolds number to obtain the Reynolds number ,in Standard The fluid flow rate corresponding to the turbulence model, Standard The wall coefficient of the cold water pipe corresponding to the turbulence model, Standard The kinematic viscosity of the fluid corresponding to the turbulence model; In the embodiment of the present invention, the standard configuration of ANSYS FLUENT is used in the fluid dynamics simulation. The turbulence model calculates the Reynolds number based on the known fluid flow rate. , cold water pipe wall coefficient and fluid kinematic viscosity , using the formula Calculate the Reynolds number R. The calculation result can provide an important basis for the subsequent turbulence simulation of the fluid. The flow rate Q is usually determined by the working conditions of the system. The wall coefficient Y is obtained by analyzing the friction characteristics of the inner surface of the pipe and the flow velocity distribution. The kinematic viscosity μ is determined by the temperature and properties of the fluid. The size of the Reynolds number R can be used to judge the flow state and provide necessary data for adjusting the flow conditions in the model, and finally the Reynolds number is obtained.

[0032] Step S23: According to the standard corresponding to the geometric model of the cold water pipe of the N-type eccentric driven shaft The turbulence model obtains the fluid dynamics characteristics of the cold water pipeline, and the inlet and outlet boundary conditions of the N-type eccentric driven shaft cold water pipeline geometric model are set based on the fluid dynamics characteristics of the cold water pipeline to obtain the inlet and outlet boundary conditions of the cold water pipeline, including the flow velocity, temperature distribution and pressure distribution corresponding to the inlet and outlet of the cold water pipeline; In the embodiment of the present invention, by The fluid dynamics characteristics calculated by the turbulence model are used to further set the inlet and outlet boundary conditions of the N-type eccentric driven shaft cold water pipe, so as to set the flow rate, pressure and temperature distribution at the pipe inlet and outlet by using the built-in fluid simulation tool of ANSYS FLUENT. The flow rate can be determined by system design parameters or experimental data, and the pressure and temperature distribution can be set according to the thermal characteristics of the cold water pipe. These boundary conditions determine the behavior of the fluid in the pipe and affect the turbulence and heat transfer characteristics. By refining the setting of boundary conditions, the simulation accuracy of the fluid flow and heat transfer process can be guaranteed, and finally the inlet and outlet boundary conditions of the cold water pipe are obtained, including the flow rate, temperature distribution and pressure distribution corresponding to the inlet and outlet of the cold water pipe.

[0033] Step S24: configuring a heat transfer model between air convection and environmental thermal radiation through the fluid dynamics precision calculation software ANSYS FLUENT, and performing thermal condition mapping setting for the corresponding eccentric driven shaft components in the N-type eccentric driven shaft cold water pipe geometric model based on the heat transfer model between air convection and environmental thermal radiation, so as to obtain the heat transfer coefficient, thermal radiation coefficient and heat condition of the heat source between the end surface corresponding to the eccentric driven shaft component and the air and the environment; In an embodiment of the present invention, a heat transfer model between air convection and environmental thermal radiation is configured in ANSYS FLUENT to simulate the heat exchange process between the cold water pipe and the environment, a suitable heat transfer model (such as natural convection or forced convection) is selected, and parameters such as the heat exchange coefficient and thermal radiation coefficient between the air and the environment are set in the model. Specifically, the heat exchange condition between the outer surface of the pipe and the air is specified to obtain the heat exchange effect between the cold water pipe and the surrounding environment. On this basis, a thermal condition mapping is set for the components of the N-type eccentric driven shaft (such as eccentric bearings, etc.), and factors such as heat flux distribution and radiation heat dissipation are mapped to the corresponding parts. In this way, the influence of the heat source can be evaluated and high-precision heat transfer simulation can be achieved. Finally, the heat exchange coefficient, thermal radiation coefficient and heat source thermal condition between the end face corresponding to the eccentric driven shaft component and the air and the environment are set.

[0034] Step S25: Based on the cold water pipe inlet and outlet boundary conditions, heat transfer coefficient, thermal radiation coefficient and heat source thermal conditions, a thermal coupling simulation model is performed on the N-type eccentric driven shaft cold water pipe geometric model to generate an eccentric driven shaft thermal-fluid coupling simulation calculation model.

[0035] In an embodiment of the present invention, a thermal-fluid coupling simulation modeling of a cold water pipe is performed based on the aforementioned set inlet and outlet boundary conditions and heat exchange coefficient. In ANSYS FLUENT, a thermal-fluid coupling method is used to combine the fluid flow with the heat transfer model. This process requires consideration of the thermophysical properties of the fluid, such as specific heat, thermal conductivity, etc., to ensure that the mutual influence of heat and flow is accurately reflected in the simulation. By modeling the heat exchange process between the fluid and components in the cold water pipe, an accurate thermal-fluid coupling simulation calculation model can be generated. The simulation model provides a basis for optimal design, can predict the temperature distribution, thermal stress and other thermal characteristics of the pipe and its components, and help improve the design of the cold water pipe and its operating efficiency, and finally generate a thermal-fluid coupling simulation calculation model of the eccentric driven shaft.

[0036] Further, step S3 includes the following steps: Step S31: establishing an interface between the outer surface and the inner surface of the cold water pipe in the eccentric driven shaft thermal-fluid coupling simulation calculation model by using the fluid dynamics precision calculation software ANSYS FLUENT, so as to generate a binding interface between the fluid domain and the solid domain inside and outside the cold water pipe; In an embodiment of the present invention, when performing a thermal-fluid coupling simulation of an eccentric driven shaft cold water pipe, the interface between the outer surface and the inner surface of the cold water pipe must first be established through the fluid dynamics precision calculation software ANSYS FLUENT. In specific operations, a three-dimensional geometric model must first be constructed in ANSYS FLUENT to ensure that the model contains all relevant components of the eccentric driven shaft and the cold water pipe. Next, the outer and inner surfaces of the cold water pipe are defined, and the coupling interface between the fluid and solid domains is used to ensure the correct binding of the fluid domain and the solid domain. When selecting the interface, the fluid dynamics coupling interface definition tool is applied, which can accurately divide the exchange area between the fluid and the solid to ensure the interaction between the heat transfer and fluid dynamics in the thermal-fluid coupling calculation. By defining these interfaces, ANSYS FLUENT can achieve accurate coupling analysis between the fluid and the solid in subsequent steps, and finally generate a binding interface between the fluid domain and the solid domain inside and outside the cold water pipe.

[0037] Step S32: Based on the binding interface between the fluid domain and the solid domain inside and outside the cold water pipe, the fluid dynamics precision calculation software ANSYS FLUENT is used to set the corresponding overall meshing quality average value to perform cross meshing between the outer surface and the inner surface of the cold water pipe in the eccentric driven shaft thermal-fluid coupling simulation calculation model, so as to generate an eccentric driven shaft thermal-fluid coupling fluid-solid cross mesh model; In an embodiment of the present invention, by combining the previously established binding interface between the fluid domain and the solid domain inside and outside the cold water pipe and setting the corresponding overall meshing quality average value by using the fluid dynamics precision calculation software ANSYS FLUENT, which is specifically 0.82, to meet the calculation conditions, the corresponding outer surface and inner surface of the cold water pipe are cross-meshed, a meshing module is selected and the global mesh parameter of the model is set to 0.82, the mesh type (such as structured mesh or unstructured mesh) and the mesh density are determined, and according to the complexity of the cold water pipe and the geometric characteristics of the eccentric driven shaft, an unstructured mesh is used to adapt to the complex shape, while ensuring that the mesh quality at the interface is uniform, when setting the meshing, the interface between the outer surface and the inner surface of the cold water pipe is locally encrypted to improve the analytical accuracy at the interface, and a cross-mesh model that meets the fluid-solid coupling requirements is generated, including the corresponding meshes of the fluid domain and the solid domain, to meet the accuracy requirements of the thermal-fluid coupling simulation calculation of the eccentric driven shaft, and finally the eccentric driven shaft thermal-fluid coupling fluid-solid cross-mesh model is generated.

[0038] Step S33: obtaining the working environment and actual working conditions corresponding to the cold water pipeline, and accurately setting the thermal physical parameters of the material used for the cold water pipeline in the eccentric driven shaft thermal-fluid coupled fluid-solid cross-grid model based on the working environment and actual working conditions corresponding to the cold water pipeline, so as to obtain the thermal physical parameters of the cold water pipeline material, including density, specific heat capacity, thermal conductivity and viscosity; In the embodiment of the present invention, after completing the grid division, the material thermophysical parameters of the cold water pipe need to be set according to the actual working conditions and working environment. First, by collecting the working environment data of the cold water pipe, including parameters such as ambient temperature, pressure and flow rate, the physical properties of the cold water pipe are accurately set in combination with the cooling requirements in the actual application. In the specific operation, the material of the cold water pipe (such as stainless steel, copper or composite materials, etc.) needs to set its thermophysical parameters according to different material types in ANSYS FLUENT. By inputting the physical property parameters of the cold water pipe material such as density, specific heat capacity, thermal conductivity and viscosity, it is ensured that these parameters are consistent with the actual working environment of the cold water pipe. For example, when setting the thermophysical properties of stainless steel in the simulation, its density (7850 ), specific heat capacity (500 J / kg·K), thermal conductivity (15 W / m·K) and viscosity (1.5 mPa·s). This process provides reliable data support for subsequent heat exchange simulation through precise material parameter settings, and ultimately obtains the thermal physical properties of the cold water pipe material, including density, specific heat capacity, thermal conductivity and viscosity.

[0039] Step S34: obtaining the main motor operating parameters corresponding to the cold water pipeline, including the main motor operating temperature, the main motor power output and the main motor heat load; In an embodiment of the present invention, when obtaining the working parameters of the main motor of the system where the cold water pipeline is located, it is first necessary to analyze the actual working environment of the cold water pipeline, especially the operating conditions of the main motor. These parameters are usually obtained through the factory on-site monitoring system or equipment manual. Specifically, the working temperature of the main motor is first determined. The temperature range can usually be found in the motor specification sheet. The data is further monitored in real time through the temperature sensor. Then, the power output of the main motor is recorded. This parameter can be obtained through the rated power and actual load operation data of the motor. In addition, the thermal load of the motor is also a key parameter, which is usually calculated by the difference between the power input and output power of the motor. Considering that the motor will have a certain amount of heat loss during operation, after these working parameters are input into ANSYS FLUENT, the necessary boundary conditions and input data are provided for the subsequent heat exchange working condition simulation analysis, and finally the corresponding main motor working parameters are obtained, including the main motor operating temperature, main motor power output and main motor thermal load.

[0040] Step S35: Based on the thermophysical properties of the cold water pipe material and the operating parameters of the main motor, the fluid dynamics precision calculation software ANSYS FLUENT is used to perform a heat exchange condition simulation analysis on the heat exchange process between the fluid flow inside and outside the cold water pipe and the solid components in the eccentric driven shaft thermal-fluid coupled fluid-solid cross-grid model, so as to generate a heat exchange simulation process between the fluid domain and the solid domain inside and outside the cold water pipe.

[0041] In an embodiment of the present invention, by obtaining the material thermophysical parameters of the cold water pipe and the working parameters of the main motor based on the aforementioned steps, the heat exchange simulation analysis stage of the thermal-fluid coupling simulation calculation model of the eccentric driven shaft is entered. In specific implementation, the thermal-fluid coupling module of ANSYS FLUENT is used to simulate the heat exchange process of the cold water pipe. The flow rate, temperature and other fluid dynamics parameters of the working fluid (such as cooling water) of the cold water pipe are set in the model, and the temperature field and flow field are calculated in combination with the thermophysical parameters of the material. During the simulation process, multi-physical field coupling simulation is gradually performed in combination with the heat load of the main motor and the fluid temperature around the cold water pipe to simulate the heat exchange process of the fluid inside and outside the cold water pipe. In this process, steady-state or transient analysis is used to simulate the heat transfer and distribution of the cold water pipe under different working conditions, calculate the heat exchange efficiency and temperature change between the solid and the fluid, and finally generate a heat exchange simulation process between the fluid domain and the solid domain inside and outside the cold water pipe.

[0042] Further, step S4 includes the following steps: Step S41: using the fluid dynamics precision calculation software ANSYS FLUENT to set a convergence criterion, an initialization function, a solution controller, and an iteration time step for the heat exchange simulation process between the fluid domain and the solid domain inside and outside the cold water pipe; In the embodiment of the present invention, ANSYS FLUENT is used to simulate and analyze the heat exchange between the fluid domain and the solid domain inside and outside the cold water pipe. First, various parameters in the simulation process need to be set and initialized. At this time, through the graphical user interface of ANSYS FLUENT, the corresponding physical model is selected to enter the solution setting interface. Setting the convergence criterion is a key step to ensure that the numerical calculation can converge stably. Usually, the residual size and the convergence criteria of multiple physical quantities such as mass, momentum, and energy are selected. The residual value is generally set to Next, the setting of the initialization function is crucial before the model solution begins. The standard initialization method is usually used to initialize the initial temperature, velocity, pressure, etc. of the fluid domain and the solid domain to ensure that the iteration starts from a reasonable initial state. The solution controller setting determines the type of solver and its calculation accuracy. Usually, a pressure-based solver is selected, and a pressure-velocity coupling method such as SIMPLE or SIMPLEC is used. The appropriate number of iteration time steps is set according to the size of the cold water pipe and the fluid conditions. , usually a stable step size based on the flow rate of the cold water pipe is selected. Specifically, the heat exchange iterative convergence calculation results are saved every 10 steps, and a total of 1000 iterations are performed to ensure the stability and accuracy of the calculation process. The time step number generally ranges from a few milliseconds to several seconds. Finally, the corresponding convergence criterion, initialization function, solution controller and iterative time step number are set.

[0043] Step S42: Based on the convergence criterion, the initialization function, the solution controller and the iteration time step, the heat exchange simulation process between the fluid domain and the solid domain inside and outside the cold water pipe is solved by the second-order coupled implicit algorithm to obtain the fluid flow distribution of the cold water pipe, the pressure distribution inside the cold water pipe and the heat transfer coefficient inside and outside the cold water pipe; In an embodiment of the present invention, in the heat exchange simulation between the fluid domain and the solid domain inside and outside the cold water pipe, the previously set convergence criterion, initialization function, solution controller and iteration time step are combined and the heat exchange process is iteratively solved by using the second-order coupled implicit algorithm. At this time, the heat exchange simulation process is started by using the solution function of ANSYS FLUENT after setting appropriate boundary conditions and initial conditions. The second-order coupled implicit algorithm can accurately capture the heat transfer between the fluid and the solid domain, ensuring the stability and efficiency of the calculation. During the iterative convergence process, the fluid flow distribution, the pressure distribution inside the pipe and the changes in the heat transfer coefficient inside and outside the cold water pipe are focused on. In each iteration, ANSYS FLUENT calculates the velocity field, pressure field and temperature field of the fluid, updates the solution result, and gradually approaches the real heat exchange state. Once the convergence criterion meets the set standard (for example, the residual is less than ), the simulation process is considered to have converged, and finally the fluid flow distribution in the cold water pipe, the pressure distribution inside the cold water pipe, and the heat transfer coefficient inside and outside the cold water pipe are obtained.

[0044] Step S43: Obtaining the Prandtl number and the Nusselt number; In an embodiment of the present invention, after completing the heat exchange simulation, it is necessary to calculate and obtain the Prandtl number (Pr) and the Nusselt number (Nu) according to the flow conditions and heat exchange characteristics of the cold water pipe. The Prandtl number is a dimensionless value that describes the relative strength of the viscous diffusion and thermal diffusion of the fluid, and is usually calculated by the specific heat capacity, viscosity and thermal conductivity of the fluid. Through the post-processing function provided by ANSYSFLUENT, the temperature field and velocity field of the fluid in the cold water pipe can be obtained, and then the Prandtl number can be calculated. The Nusselt number is a dimensionless value that describes the convective heat transfer capacity of the fluid. It is closely related to the Prandtl number and the Reynolds number. Commonly used empirical formulas such as the Dittus-Boelter formula are used to calculate the Nusselt number under turbulent conditions. By solving the fluid flow and temperature field, combined with the flow velocity, temperature and physical properties of the fluid, accurate Prandtl number and Nusselt number can be obtained.

[0045] Step S44: Based on the Reynolds number, Prandtl number and Nusselt number, the convective heat transfer coefficient of the cold water pipe is derived and analyzed to obtain the convective heat transfer coefficient of the cold water pipe fluid. , ,in, is the Nusselt number, is the thermal conductivity of the fluid, is the inner diameter of the cold water pipe, is the heat transfer coefficient inside and outside the cold water pipe, is the Reynolds number, is the empirical constant of the flow state in the cold water pipeline, is the Prandtl number, is the empirical constant of the shape of the heat exchange surface inside and outside the cold water pipe; In the embodiment of the present invention, after obtaining the Prandtl number (Pr) and the Nusselt number (Nu), the convective heat transfer coefficient is derived using the heat exchange analysis formula. First, according to the flow state of the cold water pipe (such as turbulent flow or laminar flow), a suitable empirical formula is selected to derive the convective heat transfer coefficient inside and outside the cold water pipe. Specifically, based on the Reynolds number, Prandtl number and Nusselt number of the fluid, the classic convective heat transfer relationship is used. To analyze, is the Nusselt number, specifically , is the heat transfer coefficient inside and outside the cold water pipe, is the Reynolds number, is the Prandtl number, and They are empirical constants based on the flow state. On this basis, combined with the thermal conductivity of the fluid and the inner diameter of the pipe, the convective heat transfer coefficient of the cold water pipe can be further derived. By analyzing the heat transfer coefficient under different flow conditions, it can provide an important basis for the subsequent optimization of the pipeline structure, ensure the maximization of the heat exchange effect, and finally obtain the convective heat transfer coefficient of the cold water pipe fluid.

[0046] Step S45: Based on the fluid flow distribution of the cold water pipeline, the internal pressure distribution of the cold water pipeline, and the convective heat transfer coefficient of the fluid in the cold water pipeline, the post-processing software CFD Post is used to optimize the pipeline structure of the corresponding eccentric driven shaft cold water pipeline to generate an optimized structure of the eccentric driven shaft cold water pipeline.

[0047] In an embodiment of the present invention, after obtaining the flow distribution, pressure distribution and convective heat transfer coefficient of the cold water pipeline, the pipeline structure optimization design stage is entered. At this time, the post-processing software CFD Post is used to perform three-dimensional modeling optimization analysis. First, according to the heat exchange conditions and fluid distribution inside and outside the cold water pipeline, a three-dimensional model of the eccentric driven shaft cold water pipeline is established through CFD Post, and the geometric dimensions are adjusted and optimized. In the specific operation process, the basic geometric parameters of the cold water pipeline, such as the inner diameter, outer diameter and wall thickness of the pipeline, are first input, and then the fluid mechanics parameters of the pipeline under different flow conditions (such as flow rate, pressure, temperature, etc.) are input, and CFD Post is used to post-process the flow field and thermal field of the pipeline, and the influence of different geometric shapes on fluid flow and heat exchange efficiency is analyzed. By gradually adjusting the geometric shape and structure of the pipeline, the fluid dynamics performance of the pipeline is optimized, and the optimized eccentric driven shaft cold water pipeline structure model is generated. This model can be further used for actual production or experimental verification to ensure that the pipeline design has better heat exchange performance and fluid flow efficiency, and finally the optimized structure of the eccentric driven shaft cold water pipeline is generated.

[0048] Furthermore, the second-order coupled implicit algorithm in step S42 is specifically: ; ; ; ; ; ; ; In the formula, is the velocity vector distribution of the fluid in the cold water pipe, is the density of the fluid in the cold water pipe, is the instantaneous time of the fluid in the cold water pipe, is the Laplace operator, is the pressure distribution inside the cold water pipe, is the dynamic viscosity of the cold water pipeline fluid, is the external force on the cold water pipe, For in time The heat exchange force item inside and outside the cold water pipe at is the temperature of the cold water pipe fluid, is the thermal conductivity of the cold water pipe fluid, For in time The internal heat source of the cold water pipe fluid domain at is the solid temperature of the cold water pipe, is the relative velocity vector distribution of the solid surface of the cold water pipe, is the solid thermal conductivity of the cold water pipe, is the heat exchange coefficient between the solid and fluid in the cold water pipe, For in time The solid internal heat source of the cold water pipe at For the The fluid flow distribution in the cold water pipe corresponding to the number of iteration time steps is: For the The fluid flow distribution in the cold water pipe corresponding to the number of iteration time steps is: is the number of iteration time steps, is the implicit update term for fluid dynamics, For the The temperature distribution of the cold water pipe fluid corresponding to the number of iteration time steps is: For the The temperature distribution of the cold water pipe fluid corresponding to the number of iteration time steps is: is the implicit update term for fluid heat exchange, is the fluid friction factor, is the length of the cold water pipe, is the inner diameter of the cold water pipe, is the heat transfer coefficient inside and outside the cold water pipe.

[0049] The present invention uses a specific mathematical model and verifies that a second-order coupled implicit algorithm is used to perform iterative convergence solution of the heat exchange simulation process between the fluid domain and the solid domain inside and outside the cold water pipeline. The algorithm fully considers the velocity vector distribution of the cold water pipeline fluid. , cold water pipe fluid density , cold water pipe fluid instantaneous time , the Laplace operator , pressure distribution inside the cold water pipe , dynamic viscosity of cold water pipeline fluid , external force of cold water pipe , at time Heat exchange force inside and outside the cold water pipe at , cold water pipe fluid temperature , thermal conductivity of cold water pipe fluid , at time Internal heat source of the cold water pipe fluid domain at , cold water pipe solid temperature , relative velocity vector distribution of the solid surface of the cold water pipe , solid thermal conductivity of cold water pipe , heat exchange coefficient between solid and fluid in cold water pipe , at time Solid internal heat source of cold water pipes , No. Fluid flow distribution in cold water pipe corresponding to the number of iteration time steps , No. Fluid flow distribution in cold water pipe corresponding to the number of iteration time steps , iterative time steps , the implicit update term of fluid dynamics , No. The temperature distribution of the fluid in the cold water pipe corresponding to the number of iteration time steps , No. The temperature distribution of the fluid in the cold water pipe corresponding to the number of iteration time steps , implicit update term for fluid heat exchange , fluid friction factor , cold water pipe length , cold water pipe inner diameter , heat transfer coefficient inside and outside the cold water pipe , where the velocity vector distribution of the fluid in the cold water pipe is combined , cold water pipe fluid density , cold water pipe fluid instantaneous time , the Laplace operator , pressure distribution inside the cold water pipe , dynamic viscosity of cold water pipeline fluid , external force of cold water pipe and in time Heat exchange force item inside and outside the cold water pipe at This constitutes a functional relationship of the fluid momentum equation , by combining the velocity vector distribution of the fluid in the cold water pipe , cold water pipe fluid instantaneous time , the Laplace operator , cold water pipe fluid temperature , thermal conductivity of cold water pipe fluid and in time Internal heat source of the cold water pipe fluid domain at It constitutes a functional relationship of the fluid domain heat conduction equation , by combining the solid temperature of the cold water pipe , relative velocity vector distribution of the solid surface of the cold water pipe , solid thermal conductivity of cold water pipe , heat exchange coefficient between solid and fluid in cold water pipe , at time Solid internal heat source of cold water pipes , cold water pipe fluid instantaneous time , the Laplace operator and the temperature of the cold water pipe fluid It constitutes a functional relationship of the solid domain heat conduction equation , by combining Fluid flow distribution in cold water pipe corresponding to the number of iteration time steps , No. Fluid flow distribution in cold water pipe corresponding to the number of iteration time steps , iterative time steps , the implicit update term of fluid dynamics , No. The temperature distribution of the fluid in the cold water pipe corresponding to the number of iteration time steps , No. The temperature distribution of the fluid in the cold water pipe corresponding to the number of iteration time steps and the implicit update term for fluid heat exchange The corresponding iterative update function relationship is formed , , and also by combining the fluid friction factor , cold water pipe length , cold water pipe inner diameter , velocity vector distribution of fluid in cold water pipe and the density of the fluid in the cold water pipe This constitutes a pressure distribution inside the cold water pipe Functional relationship At the same time, by combining the cold water pipeline fluid temperature , cold water pipe solid temperature , at time Internal heat source of the cold water pipe fluid domain at and in time Solid internal heat source of cold water pipes It constitutes a heat transfer coefficient inside and outside the cold water pipe. Functional relationship , the second-order coupled implicit algorithm improves the accuracy of the numerical solution by dual coupling of time and space, which means that the simulation of flow and heat transfer phenomena is more realistic and accurate, especially in the case of high flow rate or large temperature difference, the interaction between fluid and solid can be better captured. Compared with the explicit algorithm, the implicit algorithm has greater stability in time step, allowing the use of larger time step for calculation without numerical instability, which is particularly important for long-term and large-scale simulations because it can significantly save computing time and resources. The algorithm can better handle situations under different physical phenomena and boundary conditions, such as unsteady flow, variable temperature conditions and complex geometric shapes in cold water pipes. By coupling the formulas of fluid mechanics and heat conduction, it can effectively solve the interaction of multiple physical fields. Due to the use of the second-order coupling form, the algorithm can more comprehensively consider the various effects in the fluid dynamics equations, such as the coupling of momentum, energy, momentum flow, etc. This comprehensive consideration makes it more accurate when solving fluid flow distribution, pressure distribution and heat exchange coefficient. Although the implicit solution requires solving a system of linear equations, due to its faster convergence speed, when the problem is properly set (such as reasonable initial conditions and convergence criteria), the overall computational efficiency is still higher than other methods. Especially in scenarios with complex geometry or multi-physics field coupling, the efficiency improvement is more significant. With the help of accurate models of fluid flow distribution and heat exchange performance between fluid domains and solid domains, a scientific basis can be provided for subsequent pipeline structure optimization. In this process, the high-quality data generated by the second-order coupled implicit algorithm makes the optimization design not only accurate but also targeted, and can effectively capture rapidly changing flow fields and temperature fields, providing reliable simulation support for dynamic working conditions. Through the application of the above steps, more reasonable heat transfer coefficients and fluid behavior predictions can be obtained, providing basic data support for the subsequent structural optimization design process.

[0050] Further, step S45 includes the following steps: Step S451: using post-processing software CFD Post to draw a fluid flow vector distribution of the fluid flow distribution in the cold water pipeline to generate a fluid flow velocity vector distribution cloud map inside the cold water pipeline; In an embodiment of the present invention, the vector distribution of the fluid flow in the cold water pipe is drawn by using CFD Post post-processing software, so that the velocity data of the fluid inside the cold water pipe is imported from the CFD calculation results, and multiple cross-sections in the pipe are selected for analysis. In the software, the velocity vector of the fluid is visualized, and appropriate parameter settings, such as flow velocity size, direction and color scale, are selected. The generated velocity vector distribution diagram shows the flow direction, velocity intensity and distribution law of the fluid in the cold water pipe. The acceleration and deceleration areas of the fluid in the pipe can be clearly seen in the figure, and the existing uneven velocity areas, eddy current areas or areas with high local resistance can be identified. This process can not only locate the flow problem area by comparing the velocity change trend, but also provide a basis for the subsequent optimization of the pipeline design, and finally generate a velocity vector distribution cloud map of the fluid inside the cold water pipe.

[0051] Step S452: using post-processing software CFD Post to draw the pressure distribution inside the cold water pipeline to generate a pressure distribution cloud map inside the cold water pipeline; In an embodiment of the present invention, the pressure distribution inside the cold water pipe is analyzed and plotted by using CFD Post post-processing software, so as to import the pressure field distribution data in the CFD simulation calculation results, select a suitable pipe section or any area inside the pipe, and map the pressure value to the corresponding graph. In CFD Post, by setting color mapping, a pressure distribution graph is generated, which can intuitively display the high and low changes in pressure in the pipe. The pressure distribution cloud graph will show the pressure change trend inside the pipe, especially in areas where the fluid flow changes, such as elbows, valves, and flow channel contraction or expansion positions. Significant changes in pressure can be effectively identified through the graph. This process helps analyze the fluid dynamics characteristics in the cold water pipe, promptly discovers problem areas with excessive pressure drops, and finally generates a pressure distribution cloud graph inside the cold water pipe.

[0052] Step S453: using post-processing software CFD Post to draw the distribution of the convective heat transfer coefficient of the fluid in the cold water pipeline, so as to generate a distribution map of the convective heat transfer coefficient of the cold water pipeline; In an embodiment of the present invention, in the heat exchange analysis of the cold water pipe, CFD Post post-processing software is used to distribute and draw the convective heat transfer coefficient of the fluid in the cold water pipe. First, the convective heat transfer coefficient of the fluid in each area of ​​the pipe is extracted from the CFD simulation results, and a specific area (such as the area where the pipe wall is in contact with the fluid) is selected for detailed analysis. Appropriate heat flux density and temperature boundary conditions are set in the software, and the heat transfer coefficient values ​​are mapped according to the set color code to generate a convective heat transfer coefficient distribution diagram. This diagram reflects the heat exchange efficiency between the fluid in the pipe and the pipe wall. Generally, the heat exchange efficiency is higher in areas with higher fluid flow rates, and the heat exchange efficiency is lower in areas with lower flow rates. By analyzing these distribution diagrams, the heat exchange performance of the cold water pipe can be optimized, and areas with uneven heat exchange can be found, and finally a convective heat transfer coefficient distribution diagram of the cold water pipe can be generated.

[0053] Step S454: performing distribution law recognition and analysis on the flow velocity vector distribution cloud map of the fluid inside the cold water pipe, the pressure distribution cloud map of the cold water pipe, and the convective heat transfer coefficient distribution map of the cold water pipe, so as to obtain the distribution law corresponding to the flow velocity of the fluid in the cold water pipe, the pressure inside the pipe, and the convective heat transfer coefficient; In an embodiment of the present invention, a comprehensive analysis is performed on the previously generated vector distribution map of the fluid flow rate inside the cold water pipe, the pressure distribution map and the convective heat transfer coefficient distribution map to identify the distribution patterns of different areas. This process first compares and analyzes each map to identify the relationship between the flow rate, pressure and the convective heat transfer coefficient. By performing a detailed analysis of the flow rate vector map and combining the low-pressure and high-pressure areas of the pressure distribution map, the factors affecting the flow, such as the geometry of the pipe, the viscosity of the fluid, etc., are further determined. In the analysis of the convective heat transfer coefficient distribution map, attention should be paid to areas with large temperature differences, because the convective heat transfer efficiency in these areas directly affects the overall heat transfer effect. By combining the analysis results of these three, the distribution patterns of the fluid flow rate, pressure and convective heat transfer coefficient in the cold water pipe can be obtained, and finally the distribution patterns corresponding to the fluid flow rate, the pressure in the pipe and the convective heat transfer coefficient in the cold water pipe can be obtained.

[0054] Step S455: Obtain the structural design optimization objectives corresponding to the uniform flow field, significant pressure drop and uniform convection coefficient distribution of the cold water pipe, and optimize the pipeline structure of the corresponding eccentric driven shaft cold water pipe structure based on the distribution law corresponding to the fluid flow rate of the cold water pipe, the pressure in the pipe and the convection heat transfer coefficient using the structural design optimization objectives to generate the optimized structure of the eccentric driven shaft cold water pipe.

[0055] In an embodiment of the present invention, by clarifying the optimization target according to the previously obtained distribution law of flow velocity, pressure and convective heat transfer coefficient, and then optimizing the cold water pipe structure design, firstly, based on the uniform distribution of fluid flow velocity, the significant pressure drop of pressure and the uniform distribution of heat transfer coefficient, it is clarified that the goal of optimization design is to improve the uniformity of fluid flow, reduce flow dead corners and local pressure loss, and enhance the convective heat transfer effect, and then use the above distribution law as the design basis to optimize the geometric structure of the eccentric driven shaft cold water pipe, considering factors such as the directionality of fluid flow, the curvature of the pipe, the diameter change and the pipe wall material, and adjust the pipe structure through numerical optimization methods (such as parametric modeling, optimization algorithm, etc.) to improve the flow efficiency and heat transfer efficiency of the fluid, thereby generating an optimized eccentric driven shaft cold water pipe structure, the optimized design of this structure can ensure the uniformity of fluid flow velocity and heat transfer coefficient, while reducing the pressure loss in the pipe, thereby effectively improving the overall performance of the cold water pipe, and finally generating an optimized structure of the eccentric driven shaft cold water pipe.

Claims

1. A method for constructing a three-dimensional model of an eccentric driven shaft cooling water pipeline structure, characterized in that: The following steps are involved: Step S1: obtaining an N-type eccentric driven shaft cold water pipeline structural assembly drawing, and performing component geometry analysis on the N-type eccentric driven shaft cold water pipeline structural assembly drawing to obtain a structural geometry parameter set corresponding to each eccentric driven shaft component, wherein the structural geometry parameter set includes a structural geometry size parameter, a structural geometry shape parameter, and a structural eccentric shaft position; performing a three-dimensional geometry construction on the N-type eccentric driven shaft cold water pipeline structural assembly drawing based on the structural geometry parameter set corresponding to each eccentric driven shaft component using the three-dimensional modeling software SOLIDWORKS to generate a geometric model of the N-type eccentric driven shaft cold water pipeline; Step S2: Import the geometric model of the N-type eccentric driven shaft cold water pipeline into the fluid flow simulation module corresponding to the fluid dynamics precision calculation software ANSYSFLUENT to determine the fluid domain corresponding to the eccentric driven shaft cold water pipeline structure as the standard The turbulence model is used to calculate the fluid Reynolds number to obtain the Reynolds number; by setting the boundary conditions of the cold water pipe inlet and outlet, the heat transfer coefficient, thermal radiation coefficient and heat source conditions between the end faces corresponding to the eccentric driven shaft components and the air and the environment, and performing thermal coupling simulation modeling on the geometric model of the cold water pipe of the N-type eccentric driven shaft, a thermal-fluid coupling simulation calculation model of the eccentric driven shaft is generated; Step S3: cross-grid the interface between the outer surface and the inner surface of the cold water pipe in the thermal-fluid coupling simulation calculation model of the eccentric driven shaft, and perform heat exchange working condition simulation analysis on the heat exchange process between the fluid flow inside and outside the cold water pipe and the solid components in the thermal-fluid coupling simulation calculation model of the eccentric driven shaft by setting the thermal-physical property parameters of the cold water pipe material and the working parameters of the main motor, so as to generate a heat exchange simulation process between the fluid domain inside and outside the cold water pipe and the solid domain; Step S4: using the fluid dynamics precision calculation software ANSYS FLUENT to set the convergence criteria, initialization function, solution controller and iteration time step, and using the second-order coupled implicit algorithm to perform heat exchange iterative convergence solution on the heat exchange simulation process between the fluid domain and the solid domain inside and outside the cold water pipe, so as to obtain the flow distribution of the cold water pipe fluid, the pressure distribution inside the cold water pipe and the heat transfer coefficient inside and outside the cold water pipe; obtaining the Prandtl number and the Nusselt number, and based on the Reynolds number, the Prandtl number and the Nusselt number, performing convective heat transfer deduction and analysis on the heat transfer coefficient inside and outside the cold water pipe, so as to obtain the convective heat transfer coefficient of the cold water pipe fluid; based on the flow distribution of the cold water pipe fluid, the pressure distribution inside the cold water pipe and the convective heat transfer coefficient of the cold water pipe fluid, using the post-processing software CFD Post to perform pipeline structure optimization design on the corresponding eccentric driven shaft cold water pipe structure, so as to generate the optimized structure of the eccentric driven shaft cold water pipe.

2. The method for constructing a three-dimensional model of a cold water pipeline structure of an eccentric driven shaft according to claim 1, characterized in that: Step S1 includes the following steps: Step S11: obtaining an assembly drawing of a cold water pipeline structure of an N-type eccentric driven shaft; Step S12: accurately measuring the geometric dimensions of each eccentric driven shaft component in the N-type eccentric driven shaft cold water pipeline structure assembly drawing to obtain structural geometric dimension parameters corresponding to each eccentric driven shaft component, including the length, width and height corresponding to each eccentric driven shaft component; Step S13: obtaining the material physical properties corresponding to each eccentric driven shaft component, and performing a geometric shape refinement analysis on the corresponding eccentric driven shaft components in the N-type eccentric driven shaft cold water pipeline structure assembly drawing based on the material physical properties corresponding to each eccentric driven shaft component, so as to obtain the structural geometric shape parameters corresponding to each eccentric driven shaft component, including the shape size, shape curvature and shape surface flatness corresponding to each eccentric driven shaft component; Step S14: obtaining the structural layout and constraint relationship between each eccentric driven shaft component in the cold water pipeline structure through the N-type eccentric driven shaft cold water pipeline structure assembly drawing, and calculating the eccentric shaft position of the corresponding eccentric driven shaft component based on the structural layout and constraint relationship between each eccentric driven shaft component in the cold water pipeline structure, so as to obtain the structural eccentric shaft position corresponding to each eccentric driven shaft component; Step S15: Based on the structural geometric size parameters, structural geometric shape parameters and structural eccentric shaft positions corresponding to each eccentric driven shaft component, the 3D modeling software SOLIDWORKS is used to perform 3D geometric construction on the N-type eccentric driven shaft cold water pipeline structural assembly drawing to generate the N-type eccentric driven shaft cold water pipeline geometric model.

3. The method for constructing a three-dimensional model of a cold water pipeline structure of an eccentric driven shaft according to claim 2, characterized in that: The eccentric shaft position calculation in step S14 is quantitatively calculated by a structural eccentric shaft position calculation formula, wherein the structural eccentric shaft position calculation formula is specifically: ； In the formula, For the The structural eccentric shaft position corresponding to each eccentric driven shaft component, is the total number of eccentric driven shaft components, is the total mass of the cold water pipe structure of the eccentric driven shaft, is the length of the cold water pipe, is the position variable parameter of the eccentric driven shaft, For the The eccentric driven shaft components are located in The corresponding structural force at For the The eccentric driven shaft components are located in The corresponding radial distance of the eccentric shaft is For the The eccentric driven shaft components are located in The corresponding eccentric shaft rotation angle is is the total number of constraints between the eccentric driven shaft components, For each eccentric driven shaft component The stiffness coefficient corresponding to the constraint is For each eccentric driven shaft component Constraints at location The corresponding structural deformation at is an exponential function, is the radial friction attenuation factor of the eccentric driven shaft components, is the correction factor for the eccentric shaft position of the structure.

4. The method for constructing a three-dimensional model of an eccentric driven shaft cooling water pipeline structure according to claim 1, characterized in that: Step S2 includes the following steps: Step S21: Import the N-type eccentric driven shaft cold water pipeline geometric model into the fluid flow simulation module corresponding to the fluid dynamics precision calculation software ANSYSFLUENT and set the fluid domain corresponding to the eccentric driven shaft cold water pipeline structure in the N-type eccentric driven shaft cold water pipeline geometric model as the standard Turbulence models; Step S22: Standard The turbulence model calculates the fluid Reynolds number to obtain the Reynolds number ,in Standard The fluid flow rate corresponding to the turbulence model, Standard The wall coefficient of the cold water pipe corresponding to the turbulence model, Standard The kinematic viscosity of the fluid corresponding to the turbulence model; Step S23: According to the standard corresponding to the geometric model of the cold water pipe of the N-type eccentric driven shaft The turbulence model obtains the fluid dynamics characteristics of the cold water pipeline, and the inlet and outlet boundary conditions of the N-type eccentric driven shaft cold water pipeline geometric model are set based on the fluid dynamics characteristics of the cold water pipeline to obtain the inlet and outlet boundary conditions of the cold water pipeline, including the flow velocity, temperature distribution and pressure distribution corresponding to the inlet and outlet of the cold water pipeline; Step S24: configuring a heat transfer model between air convection and environmental thermal radiation through the fluid dynamics precision calculation software ANSYS FLUENT, and performing thermal condition mapping setting for the corresponding eccentric driven shaft components in the N-type eccentric driven shaft cold water pipe geometric model based on the heat transfer model between air convection and environmental thermal radiation, so as to obtain the heat transfer coefficient, thermal radiation coefficient and heat condition of the heat source between the end surface corresponding to the eccentric driven shaft component and the air and the environment; Step S25: Based on the cold water pipe inlet and outlet boundary conditions, heat transfer coefficient, thermal radiation coefficient and heat source thermal conditions, a thermal coupling simulation model is performed on the N-type eccentric driven shaft cold water pipe geometric model to generate an eccentric driven shaft thermal-fluid coupling simulation calculation model.

5. The method for constructing a three-dimensional model of an eccentric driven shaft cooling water pipeline structure according to claim 1, characterized in that: Step S3 includes the following steps: Step S31: establishing an interface between the outer surface and the inner surface of the cold water pipe in the eccentric driven shaft thermal-fluid coupling simulation calculation model by using the fluid dynamics precision calculation software ANSYS FLUENT, so as to generate a binding interface between the fluid domain and the solid domain inside and outside the cold water pipe; Step S32: Based on the binding interface between the fluid domain and the solid domain inside and outside the cold water pipe, the fluid dynamics precision calculation software ANSYS FLUENT is used to set the corresponding overall meshing quality average value to perform cross meshing between the outer surface and the inner surface of the cold water pipe in the eccentric driven shaft thermal-fluid coupling simulation calculation model, so as to generate an eccentric driven shaft thermal-fluid coupling fluid-solid cross mesh model; Step S33: obtaining the working environment and actual working conditions corresponding to the cold water pipeline, and accurately setting the thermal physical parameters of the material used for the cold water pipeline in the eccentric driven shaft thermal-fluid coupled fluid-solid cross-grid model based on the working environment and actual working conditions corresponding to the cold water pipeline, so as to obtain the thermal physical parameters of the cold water pipeline material, including density, specific heat capacity, thermal conductivity and viscosity; Step S34: obtaining the main motor operating parameters corresponding to the cold water pipeline, including the main motor operating temperature, the main motor power output and the main motor heat load; Step S35: Based on the thermophysical properties of the cold water pipe material and the operating parameters of the main motor, the fluid dynamics precision calculation software ANSYS FLUENT is used to perform a heat exchange condition simulation analysis on the heat exchange process between the fluid flow inside and outside the cold water pipe and the solid components in the eccentric driven shaft thermal-fluid coupled fluid-solid cross-grid model, so as to generate a heat exchange simulation process between the fluid domain and the solid domain inside and outside the cold water pipe.

6. The method for constructing a three-dimensional model of a cold water pipeline structure of an eccentric driven shaft according to claim 5, characterized in that: The overall meshing quality average value described in step S32 is specifically 0.

82.

7. The method for constructing a three-dimensional model of a cold water pipeline structure of an eccentric driven shaft according to claim 1, characterized in that: Step S4 includes the following steps: Step S41: using the fluid dynamics precision calculation software ANSYS FLUENT to set a convergence criterion, an initialization function, a solution controller, and an iteration time step for the heat exchange simulation process between the fluid domain and the solid domain inside and outside the cold water pipe; Step S42: Based on the convergence criterion, the initialization function, the solution controller and the iteration time step, the heat exchange simulation process between the fluid domain and the solid domain inside and outside the cold water pipe is solved by the second-order coupled implicit algorithm to obtain the fluid flow distribution of the cold water pipe, the pressure distribution inside the cold water pipe and the heat transfer coefficient inside and outside the cold water pipe; Step S43: Obtaining the Prandtl number and the Nusselt number; Step S44: Based on the Reynolds number, Prandtl number and Nusselt number, the convective heat transfer coefficient of the cold water pipeline is derived and analyzed to obtain the convective heat transfer coefficient of the cold water pipeline fluid. , ,in, is the Nusselt number, is the thermal conductivity of the fluid, is the inner diameter of the cold water pipe, is the heat transfer coefficient inside and outside the cold water pipe, is the Reynolds number, is the empirical constant of the flow state in the cold water pipeline, is the Prandtl number, is the empirical constant of the shape of the heat exchange surface inside and outside the cold water pipe; Step S45: Based on the fluid flow distribution of the cold water pipeline, the internal pressure distribution of the cold water pipeline, and the convective heat transfer coefficient of the fluid in the cold water pipeline, the post-processing software CFD Post is used to optimize the pipeline structure of the corresponding eccentric driven shaft cold water pipeline to generate an optimized structure of the eccentric driven shaft cold water pipeline.

8. The method for constructing a three-dimensional model of a cold water pipeline structure of an eccentric driven shaft according to claim 7, characterized in that: The number of iteration time steps described in step S41 Specifically, the convergence calculation results of the hot exchange iteration are saved every 10 steps, and a total of 1000 iterations are performed.

9. The method for constructing a three-dimensional model of a cold water pipeline structure of an eccentric driven shaft according to claim 7, characterized in that: The second-order coupled implicit algorithm in step S42 is specifically: ； ； ； ； ； ； ； In the formula, is the velocity vector distribution of the fluid in the cold water pipe, is the density of the fluid in the cold water pipe, is the instantaneous time of the fluid in the cold water pipe, is the Laplace operator, is the pressure distribution inside the cold water pipe, is the dynamic viscosity of the cold water pipeline fluid, is the external force on the cold water pipe, For in time The heat exchange force item inside and outside the cold water pipe at is the temperature of the cold water pipe fluid, is the thermal conductivity of the cold water pipe fluid, For in time The internal heat source of the cold water pipe fluid domain at is the solid temperature of the cold water pipe, is the relative velocity vector distribution of the solid surface of the cold water pipe, is the solid thermal conductivity of the cold water pipe, is the heat exchange coefficient between the solid and fluid in the cold water pipe, For in time The solid internal heat source of the cold water pipe at For the The fluid flow distribution in the cold water pipe corresponding to the number of iteration time steps is: For the The fluid flow distribution in the cold water pipe corresponding to the number of iteration time steps is: is the number of iteration time steps, is the implicit update term for fluid dynamics, For the The temperature distribution of the cold water pipe fluid corresponding to the number of iteration time steps is: For the The temperature distribution of the cold water pipe fluid corresponding to the number of iteration time steps is: is the implicit update term for fluid heat exchange, is the fluid friction factor, is the length of the cold water pipe, is the inner diameter of the cold water pipe, is the heat transfer coefficient inside and outside the cold water pipe.

10. The method for constructing a three-dimensional model of a cold water pipeline structure of an eccentric driven shaft according to claim 7, characterized in that: Step S45 includes the following steps: Step S451: using post-processing software CFD Post to draw a fluid flow vector distribution of the fluid flow distribution in the cold water pipeline to generate a fluid flow velocity vector distribution cloud map inside the cold water pipeline; Step S452: using post-processing software CFD Post to draw the pressure distribution inside the cold water pipeline to generate a pressure distribution cloud map inside the cold water pipeline; Step S453: using post-processing software CFD Post to draw the distribution of the convective heat transfer coefficient of the fluid in the cold water pipeline, so as to generate a distribution map of the convective heat transfer coefficient of the cold water pipeline; Step S454: performing distribution law recognition and analysis on the flow velocity vector distribution cloud map of the fluid inside the cold water pipe, the pressure distribution cloud map of the cold water pipe, and the convective heat transfer coefficient distribution map of the cold water pipe, so as to obtain the distribution law corresponding to the flow velocity of the fluid in the cold water pipe, the pressure inside the pipe, and the convective heat transfer coefficient; Step S455: Obtain the structural design optimization objectives corresponding to the uniform flow field, significant pressure drop and uniform convection coefficient distribution of the cold water pipe, and optimize the pipeline structure of the corresponding eccentric driven shaft cold water pipe structure based on the distribution law corresponding to the fluid flow rate of the cold water pipe, the pressure in the pipe and the convection heat transfer coefficient using the structural design optimization objectives to generate the optimized structure of the eccentric driven shaft cold water pipe.

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