Three-dimensional Model Construction Method for Cold Water Pipeline Structure of Eccentric Driven Shaft

Abstract

The present invention relates to the field of engineering simulation technology, and particularly to a method for constructing a three-dimensional model of a cold water pipeline structure of an eccentric driven shaft. The method includes the following steps: obtaining an assembly drawing of the N-type eccentric driven shaft cold water pipeline structure and performing component geometric analysis and three-dimensional geometry construction to generate a geometric model of the N-type eccentric driven shaft cold water pipeline, and importing it into the corresponding fluid flow simulation module to calculate the fluid Reynolds number to obtain the Reynolds number; setting boundary conditions and thermal conditions and performing thermal coupling simulation modeling, while performing cross-mesh division and heat exchange condition simulation analysis to generate a heat exchange simulation process; performing heat exchange iterative convergence solution on the heat exchange simulation process, while performing convective heat transfer derivation analysis and pipeline structure optimization design to generate an optimized structure of the eccentric driven shaft cold water pipeline. The present invention can reduce the pressure drop in the pipeline and optimize the distribution of the convective heat transfer coefficient.

Description

Technical Field

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

[0002] As a key part of the cooling system, the structural design of the cold water pipe structure of the eccentric driven shaft is of great significance 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 technologies to optimize the cold water pipe design. By combining the special structural characteristics of the cold water pipe of the eccentric driven shaft based on three-dimensional modeling technology, accurately construct the three-dimensional model of the pipe, and optimize the design through efficient simulation analysis. This method should have the advantages of high efficiency, accuracy and flexibility, and 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 to improve the cooling effect and energy efficiency. However, the existing methods for constructing cold water pipe structures often rely on manual calculations and traditional CAD design tools. Although these methods can meet the basic design requirements, in a complex three-dimensional space environment, it is difficult to effectively simulate the actual operating state of the pipe and cannot comprehensively consider the changes in fluid flow and temperature distribution caused by the eccentric shaft, resulting in a 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 a cold water pipe structure of an eccentric driven shaft includes the following steps:

[0005] Step S1: Obtain the assembly drawing of the N-type cold water pipe structure of the eccentric driven shaft, and perform geometric analysis on the assembly drawing of the N-type cold water pipe structure of the eccentric driven shaft to obtain the set of structural geometric parameters corresponding to each eccentric driven shaft component, where the set of structural geometric parameters includes structural geometric dimension parameters, structural geometric shape parameters, and the position of the structural eccentric shaft; based on the set of structural geometric parameters corresponding to each eccentric driven shaft component, use the three-dimensional modeling software SOLIDWORKS to perform three-dimensional geometric construction on the assembly drawing of the N-type cold water pipe structure of the eccentric driven shaft to generate the geometric model of the N-type cold water pipe structure of the eccentric driven shaft;

[0006] Step S2: Import the geometric model of the N-type cold water pipe structure of the eccentric driven shaft into the fluid flow simulation module corresponding to the fluid dynamics precise calculation software ANSYS FLUENT to determine that the fluid domain corresponding to the cold water pipe structure of the eccentric driven shaft is standard A turbulence model is used and the fluid Reynolds number is calculated to obtain the Reynolds number. By setting the inlet and outlet boundary conditions of the cold water pipe and the heat transfer coefficients, thermal radiation coefficients, and heat source thermal conditions between the end faces corresponding to the eccentric driven shaft components and the air and the environment, and performing a thermal coupling simulation modeling on the geometric model of the N-type eccentric driven shaft cold water pipe, a thermal-fluid coupling simulation calculation model of the eccentric driven shaft is generated.

[0007] Step S3: Cross-mesh division is performed on 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. By setting the thermal physical property parameters of the cold water pipe material and the working parameters of the main motor, a thermal exchange condition simulation analysis is carried out on the heat transfer process between the internal and external fluids and the solid components in the thermal-fluid coupling simulation calculation model of the eccentric driven shaft to generate a thermal exchange simulation process between the internal and external fluid domains and the solid domain of the cold water pipe.

[0008] Step S4: The convergence criterion, initialization function, solution controller, and iteration time steps are set through the fluid dynamics precise calculation software ANSYS FLUENT, and the thermal exchange simulation process between the internal and external fluid domains and the solid domain of the cold water pipe is solved by iterative convergence using the second-order coupled implicit algorithm to obtain the fluid flow distribution in the cold water pipe, the internal pressure distribution in the cold water pipe, and the heat transfer coefficients inside and outside the cold water pipe. The Prandtl number and Nusselt number are obtained, and based on the Reynolds number, Prandtl number, and Nusselt number, a convective heat transfer derivation analysis is carried out on the heat transfer coefficients inside and outside the cold water pipe to obtain the convective heat transfer coefficient of the cold water pipe fluid. Based on the fluid flow distribution in the cold water pipe, the internal pressure distribution in the cold water pipe, and the convective heat transfer coefficient of the cold water pipe fluid, the corresponding eccentric driven shaft cold water pipe structure is optimized by using the post-processing software CFD Post to generate an optimized structure of the eccentric driven shaft cold water pipe.

[0009] Further, step S1 includes the following steps:

[0010] Step S11: Obtain the structure assembly drawing of the N-type eccentric driven shaft cold water pipe.

[0011] Step S12: Accurately measure the geometric dimensions of each eccentric driven shaft component in the structure assembly drawing of the N-type eccentric driven shaft cold water pipe to obtain the corresponding structural geometric dimension parameters of each eccentric driven shaft component, including the length, width, and height corresponding to each eccentric driven shaft component.

[0012] Step S13: Obtain the material physical properties corresponding to each eccentric follower shaft component, and perform refined geometric analysis on the corresponding eccentric follower shaft components in the N-type eccentric follower shaft cold water pipe structure assembly drawing based on the material physical properties corresponding to each eccentric follower shaft component, so as to obtain the structural geometric shape parameters corresponding to each eccentric follower shaft component, including the shape size, shape curvature, and shape surface flatness corresponding to each eccentric follower shaft component;

[0013] Step S14: Obtain the structural layout and constraint relationship between each eccentric follower shaft component in the cold water pipe structure through the N-type eccentric follower shaft cold water pipe structure assembly drawing, and calculate the eccentric shaft position of the corresponding eccentric follower shaft component based on the structural layout and constraint relationship between each eccentric follower shaft component in the cold water pipe structure, so as to obtain the structural eccentric shaft position corresponding to each eccentric follower shaft component;

[0014] Step S15: Based on the structural geometric dimension parameters, structural geometric shape parameters, and structural eccentric shaft position corresponding to each eccentric follower shaft component, use the 3D modeling software SOLIDWORKS to perform 3D geometric construction on the N-type eccentric follower shaft cold water pipe structure assembly drawing to generate the N-type eccentric follower shaft cold water pipe geometric model.

[0015] Furthermore, the eccentric shaft position calculation in Step S14 is quantitatively calculated through the structural eccentric shaft position calculation formula. Among them, the structural eccentric shaft position calculation formula is specifically:

[0016] ;

[0017] In the formula, is the structural eccentric shaft position corresponding to the th eccentric follower shaft component, is the total number of eccentric follower shaft components, is the total mass of the eccentric follower shaft cold water pipe structure, is the length of the cold water pipe, is the eccentric shaft position variable parameter, is the th eccentric follower shaft component at the position corresponding structural acting force, is the th eccentric follower shaft component at the position corresponding eccentric shaft radial distance, is the th eccentric follower shaft component at the position corresponding eccentric shaft rotation angle, is the total number of constraints between each eccentric follower shaft component, The stiffness coefficient corresponding to the th constraint among the components of each eccentric follower shaft, The th constraint among the components of each eccentric follower shaft at the position corresponds to the structural deformation amount, is an exponential function, is the radial friction attenuation factor of the eccentric follower shaft components, is the correction coefficient of the structural eccentric shaft position.

[0018] Furthermore, step S2 includes the following steps:

[0019] Step S21: Import the geometric model of the N-type eccentric follower shaft cold water pipeline into the fluid flow simulation module corresponding to the fluid dynamics precise calculation software ANSYS FLUENT and set the fluid domain corresponding to the structure of the eccentric follower shaft cold water pipeline in the N-type eccentric follower shaft cold water pipeline geometric model as the standard turbulence model;

[0020] Step S22: Calculate the fluid Reynolds number for the standard turbulence model to obtain the Reynolds number , where is the fluid flow rate corresponding to the standard turbulence model, is the cold water pipeline wall coefficient corresponding to the standard turbulence model, is the fluid kinematic viscosity corresponding to the standard turbulence model;

[0021] Step S23: Obtain the hydrodynamic characteristics of the cold water pipeline through the standard turbulence model corresponding to the N-type eccentric follower shaft cold water pipeline geometric model, and set the inlet and outlet boundary conditions of the N-type eccentric follower shaft cold water pipeline geometric model based on the hydrodynamic characteristics of the cold water pipeline, so as to set 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;

[0022] Step S24: Configure the heat transfer model between air convection and environmental thermal radiation through the fluid dynamics precise calculation software ANSYS FLUENT, and set the thermal condition mapping of the eccentric follower shaft components corresponding to the N-type eccentric follower shaft cold water pipeline 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 source thermal condition between the end face of the eccentric follower shaft components and air and the environment;

[0023] Step S25: Based on the boundary conditions at the inlet and outlet of the cold water pipe, the heat transfer coefficient, the thermal radiation coefficient, and the heat source thermal conditions, perform a thermal coupling simulation modeling on the geometric model of the N-type eccentric driven shaft cold water pipe to generate a thermal-fluid coupling simulation calculation model of the eccentric driven shaft.

[0024] Further, step S3 includes the following steps:

[0025] Step S31: Use the fluid dynamics precise calculation software ANSYS FLUENT to establish an 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 to generate a bonded interface between the internal and external fluid domains and the solid domain of the cold water pipe;

[0026] Step S32: Based on the bonded interface between the internal and external fluid domains and the solid domain of the cold water pipe, use the fluid dynamics precise calculation software ANSYS FLUENT to set the corresponding overall mesh division quality average value to perform cross-mesh division 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 to generate a thermal-fluid-solid cross-mesh model of the eccentric driven shaft;

[0027] Step S33: Obtain the working environment and actual working conditions corresponding to the cold water pipe, and accurately set the thermal physical properties parameters of the material used for the cold water pipe in the thermal-fluid-solid cross-mesh model of the eccentric driven shaft based on the working environment and actual working conditions corresponding to the cold water pipe to obtain the thermal physical properties parameters of the cold water pipe material, including density, specific heat capacity, thermal conductivity, and viscosity;

[0028] Step S34: Obtain the main motor working parameters corresponding to the cold water pipe, including the main motor working temperature, the main motor power output, and the main motor thermal load;

[0029] Step S35: Based on the thermal physical properties parameters of the cold water pipe material and the main motor working parameters, use the fluid dynamics precise calculation software ANSYS FLUENT to perform a thermal exchange condition simulation analysis on the heat exchange process between the internal and external fluid flows and the solid components of the cold water pipe in the thermal-fluid-solid cross-mesh model of the eccentric driven shaft to generate a thermal exchange simulation process between the internal and external fluid domains and the solid domain of the cold water pipe.

[0030] Further, the specific value of the overall mesh division quality average value described in step S32 is 0.82.

[0031] Further, step S4 includes the following steps:

[0032] Step S41: Use the fluid dynamics precise calculation software ANSYS FLUENT to set the convergence criterion, initialization function, solution controller, and iterative time steps for the thermal exchange simulation process between the internal and external fluid domains and the solid domain of the cold water pipe;

[0033] Step S42: Based on the convergence criterion, initialization function, solution controller, and iteration time steps, and using the second-order coupled implicit algorithm, perform heat transfer iteration convergence solution on the heat transfer simulation process between the fluid domains and the solid domain inside and outside the cold water pipe to obtain the fluid flow distribution of the cold water pipe, the internal pressure distribution of the cold water pipe, and the heat transfer coefficient inside and outside the cold water pipe;

[0034] Step S43: Obtain the Prandtl number and the Nusselt number;

[0035] Step S44: Based on the Reynolds number, Prandtl number, and Nusselt number, conduct convective heat transfer derivation and analysis on the heat transfer coefficient inside and outside the cold water pipe to obtain the convective heat transfer coefficient of the cold water pipe fluid , , where, is the Nusselt number, is the fluid thermal conductivity, 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 cold water pipe flow state, is the Prandtl number, is the empirical constant of the heat transfer surface shape inside and outside the cold water pipe;

[0036] Step S45: Based on the fluid flow distribution of the cold water pipe, the internal pressure distribution of the cold water pipe, and the convective heat transfer coefficient of the cold water pipe fluid, use the post-processing software CFD Post to optimize the design of the corresponding eccentric driven shaft cold water pipe structure to generate the optimized structure of the eccentric driven shaft cold water pipe.

[0037] Furthermore, the iteration time steps mentioned in Step S41 are specifically to save the heat transfer iteration convergence calculation results every 10 steps, and a total of 1000 steps of iteration are performed.

[0038] Furthermore, the second-order coupled implicit algorithm in Step S42 is specifically:

[0039] ;

[0040] ;

[0041] ;

[0042] ;

[0043] ;

[0044] ;

[0045] ;

[0046] In the formula, is the fluid velocity vector distribution of the cold water pipe, is the fluid density of the cold water pipe, is the instantaneous time of the fluid in the cold water pipe, is the Laplace operator, is the internal pressure distribution of the cold water pipe, is the dynamic viscosity of the fluid in the cold water pipe, is the external force of the cold water pipe, is at time the internal and external heat exchange force term of the cold water pipe, is the fluid temperature of the cold water pipe, is the thermal conductivity of the fluid in the cold water pipe, is at time the internal heat source in the fluid domain of the cold water pipe, 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 thermal conductivity of the solid of the cold water pipe, is the heat exchange coefficient between the solid and the fluid of the cold water pipe, is at time the internal heat source of the solid of the cold water pipe, is the th iteration time step corresponding to the fluid flow distribution of the cold water pipe, is the th iteration time step corresponding to the fluid flow distribution of the cold water pipe, is the iteration time step, is the implicit update term of hydrodynamics, is the th iteration time step corresponding to the fluid temperature distribution of the cold water pipe, is the th iteration time step corresponding to the fluid temperature distribution of the cold water pipe, is the implicit update term of 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 internal and external heat transfer coefficient of the cold water pipe.

[0047] Furthermore, step S45 includes the following steps:

[0048] Step S451: Use the post-processing software CFD Post to draw the fluid flow vector distribution of the cold water pipeline fluid flow to generate the cloud diagram of the fluid velocity vector distribution inside the cold water pipeline;

[0049] Step S452: Use the post-processing software CFD Post to draw the pressure distribution of the internal pressure of the cold water pipeline to generate the cloud diagram of the internal pressure distribution of the cold water pipeline;

[0050] Step S453: Use the post-processing software CFD Post to draw the convective heat transfer coefficient distribution of the cold water pipeline fluid to generate the convective heat transfer coefficient distribution diagram of the cold water pipeline;

[0051] Step S454: Identify and analyze the distribution laws of the cloud diagram of the fluid velocity vector distribution inside the cold water pipeline, the cloud diagram of the internal pressure distribution of the cold water pipeline, and the convective heat transfer coefficient distribution diagram of the cold water pipeline to obtain the corresponding distribution laws of the fluid velocity, internal pressure, and convective heat transfer coefficient of the cold water pipeline;

[0052] Step S455: Obtain the structural design optimization objectives corresponding to the uniform flow field, significant pressure drop, and uniform convective coefficient distribution of the cold water pipeline, and use the structural design optimization objectives to optimize the pipeline structure of the corresponding eccentric driven shaft cold water pipeline based on the distribution laws of the fluid velocity, internal pressure, and convective heat transfer coefficient of the cold water pipeline to generate the optimized structure of the eccentric driven shaft cold water pipeline.

[0053] Advantages of the present invention:

[0054] The method for constructing a three-dimensional model of the eccentric driven shaft cold water pipeline structure proposed by the present invention, compared with the prior art, the beneficial effect of the present application is 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 and functional requirements of each component can be clearly understood, which helps the subsequent precise measurement, modeling and analysis of each component, ensuring the smooth progress and optimization of the entire design process. Through the geometric analysis of each eccentric driven shaft component in the assembly drawing of the N-type eccentric driven shaft cold water pipeline structure, the specific size information of each component can be obtained. Precise geometric dimension measurement can not only help designers confirm the size, shape and proportion of the components, but also help to discover errors or interference situations during the assembly process, ensuring that the components will not be misaligned or interfered during operation, thus avoiding potential problems during 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 three-dimensional modeling software SOLIDWORKS to perform three-dimensional geometry construction on the assembly drawing of the N-type eccentric driven shaft cold water pipeline structure, the geometric shape, size and relative position of the components can be observed more intuitively, and existing design defects or unreasonable places can be discovered in advance. During the three-dimensional modeling process, the design can be modified and optimized in real time, thus reducing errors and uncertainties in traditional design. Through software such as SOLIDWORKS, designers can also perform virtual assembly and interference checking to ensure that there are no conflicts during the actual assembly process. The three-dimensional model can also be used as a basis for manufacturing and processing, helping manufacturers to precisely manufacture components, reducing errors and improving production efficiency. Three-dimensional modeling not only improves the accuracy and visualization of the design, but also can effectively simulate the actual operating state of the cold water pipeline structure. Secondly, after importing the geometric model of the N-type eccentric driven shaft cold water pipeline into the fluid dynamics precise calculation software ANSYS FLUENT, the fluid domain of the model is confirmed, and a suitable Turbulence model, and calculate the Reynolds number of the fluid to obtain the Reynolds number. This step of calculating the Reynolds number of the fluid is crucial for ensuring the correct simulation of the fluid flow behavior. The Reynolds number is a key indicator for determining whether the fluid flow is turbulent, and it is usually calculated through the fluid flow rate, wall coefficient, and kinematic viscosity of the fluid. By calculating the Reynolds number, the flow state of the fluid in the cold water pipeline of the N-type eccentric driven shaft can be obtained, thereby determining whether the turbulence parameters in the model should be adjusted or the simulation settings optimized. This step helps engineers accurately understand the flow characteristics of the fluid, determine whether it is in the turbulent range, and ensures the accuracy and reliability of the thermal-fluid coupling model. By setting the inlet and outlet boundary conditions of the cold water pipeline, as well as the heat transfer coefficient, thermal radiation coefficient, and heat source thermal conditions between the corresponding 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 pipeline, this process closely combines the hydrodynamic characteristics of the cold water pipeline with the heat conduction process to generate a comprehensive calculation model that includes temperature changes, heat flux distribution, and heat transfer effects. Through thermal-fluid coupling simulation, the heat transfer performance and hydrodynamic performance of the N-type eccentric driven shaft cold water pipeline under different operating conditions can be comprehensively evaluated. By combining fluid flow and heat transfer simulations, it is possible to better predict and optimize the temperature distribution, pressure changes, and flow state of the system, thereby improving the design efficiency and operating stability of the system and helping to develop a more efficient and reliable cooling system. Then, by performing cross-mesh division on the interface between the outer surface and the inner surface of the cold water pipeline within the thermal-fluid coupling simulation calculation model of the eccentric driven shaft, precise coupling between the internal and external fluid domains and the solid domain of the cold water pipeline can be achieved. Mesh division is the basis of computational fluid dynamics (CFD) simulation, and 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 surfaces but also handle the complex geometric shape of the cold water pipeline and the heat flow characteristics of the eccentric driven shaft, enabling it to more accurately predict heat load transfer, flow behavior, and temperature distribution. The optimized mesh division can significantly improve the computational efficiency, reduce the computational time, and at the same time avoid result errors caused by uneven or overly coarse meshes, providing strong support for efficient and accurate thermal-fluid coupling analysis.The heat exchange process between the internal and external fluids of the cold water pipe and the solid components in the thermal-fluid coupling simulation calculation model of the eccentric driven shaft is also simulated and analyzed by setting the thermal physical property parameters of the cold water pipe material and the operating parameters of the main motor. The accurate simulation of the heat exchange process is crucial for predicting the working state of the cold water pipe. Especially in special design cases such as the eccentric driven shaft, the heat transfer between the fluid and the 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 change, flow resistance, etc. This not only provides detailed data support for the design of the cold water pipe but also comprehensively considers the changes in fluid flow and temperature distribution caused by the eccentric shaft. Finally, the convergence criterion, initialization function, solution controller, and iterative time steps are set through the fluid dynamics precise calculation software ANSYS FLUENT, and the second-order coupled implicit algorithm is used to perform iterative convergence solution for the heat exchange simulation process between the internal and external fluid domains and the solid domain of the cold water pipe. The second-order coupled implicit algorithm is applied to the heat exchange simulation between the internal and external fluids and the solid domain of 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, 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 iteration and convergence, the fluid flow, pressure distribution, and heat exchange coefficient data obtained 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 Nusselt number and combining 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, based on the fluid flow distribution of the cold water pipe, the internal pressure distribution of the cold water pipe, and the convective heat transfer coefficient of the cold water pipe fluid, the post-processing software CFD Post is used to optimize the pipeline structure design of the corresponding eccentric driven shaft cold water pipe. In CFD Post, the data such as fluid flow, temperature field, and pressure field inside the pipe can be intuitively viewed through visualization tools, which helps designers identify potential flow dead zones, areas with excessive pressure drop, or low heat transfer efficiency. Based on these analysis results, the optimization design can improve the hydrodynamic performance of the cold water pipe, thereby enhancing the accuracy and precision of the three-dimensional modeling design results. Brief Description of the Drawings

[0055] Other features, objects, and advantages of the present invention will become more apparent from the following detailed description of non-limiting embodiments read in conjunction with the accompanying drawings:

[0056] Figure 1Schematic diagram of the step flow of the method for constructing a three-dimensional model of the eccentric driven shaft cold water pipeline structure of the present invention;

[0057] Figure 2 is Figure 1 a detailed step flow diagram of step S1 in Specific embodiments

[0058] The technical method of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are part of the embodiments of the present invention, rather than all of them. All other embodiments obtained by those skilled in the art within the scope of the present invention without creative work belong to the scope of protection of the present invention.

[0059] To achieve the above object, please refer to Figures 1 to 2 , the present invention provides a method for constructing a three-dimensional model of an eccentric driven shaft cold water pipeline structure. In the embodiments of the present invention, please refer to Figure 1 shown, which is a schematic diagram of the step flow of the method for constructing a three-dimensional model of the eccentric driven shaft cold water pipeline structure of the present invention. In this example, the method for constructing a three-dimensional model of the eccentric driven shaft cold water pipeline structure includes the following steps:

[0060] Step S1: Obtain the assembly drawing of the N-type eccentric driven shaft cold water pipeline structure, and perform geometric analysis on the assembly drawing of the N-type eccentric driven shaft cold water pipeline structure to obtain the corresponding structural geometric parameter sets of each eccentric driven shaft component, where the structural geometric parameter sets include structural geometric dimension parameters, structural geometric shape parameters, and the position of the structural eccentric shaft; based on the corresponding structural geometric parameter sets of each eccentric driven shaft component, use the three-dimensional modeling software SOLIDWORKS to perform three-dimensional geometric construction on the assembly drawing of the N-type eccentric driven shaft cold water pipeline structure to generate the geometric model of the N-type eccentric driven shaft cold water pipeline;

[0061] In an embodiment of the present invention, according to design requirements and system needs, an assembly drawing of the N-type eccentric driven shaft cold water pipe structure is obtained. This drawing should be a standard CAD format file, such as DWG, DXF, etc., which can provide the spatial positions, connection relationships, and dimensions of the complete pipe system and each component of the eccentric driven shaft, so as to obtain the assembly drawing of the N-type eccentric driven shaft cold water pipe structure. By precisely measuring the geometric dimensions of each component in the obtained assembly drawing of the N-type eccentric driven shaft cold water pipe structure, the length, width, and height of each component of the eccentric driven shaft are obtained by using professional CAD software (such as AutoCAD) to magnify the drawing and view details, and using the measurement tools (such as distance measurement, angle measurement, etc.) in the software to measure the length, width, and height of each component one by one. By collecting the material physical properties of each component, such as density, elastic modulus, tensile strength, thermal expansion coefficient, etc., according to the material type of the components marked in the assembly drawing of the N-type eccentric driven shaft cold water pipe, and performing refined analysis on the geometric shape of the components based on these properties, this analysis can be achieved through finite element analysis (FEA) software. According to the geometric dimensions of each component, the 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 shape of the components is further optimized, so as to generate precise geometric shape parameters, including shape size, shape curvature, surface flatness, etc. Also, based on the assembly drawing of the N-type eccentric driven shaft cold water pipe structure, the relative positions and constraint relationships of each component are determined. The specific steps include analyzing the connection methods (such as welding, bolt connection, etc.), relative positions (such as eccentric angle, distance, etc.), and force transmission paths of each component in the drawing. On this basis, the position of the eccentric shaft of each component is calculated. The position of the eccentric shaft refers to the central axis position of the eccentric driven shaft relative to other components. Then, after completing the foregoing steps, the three-dimensional geometric construction of the assembly drawing of the N-type eccentric driven shaft cold water pipe structure is carried out using the three-dimensional modeling software SOLIDWORKS. First, the previously obtained geometric dimension parameters and geometric shape parameters are input into SOLIDWORKS, and the spatial coordinates of the components are set according to the calculated eccentric shaft position. Through the modeling tools of SOLIDWORKS, the three-dimensional models of each component are gradually constructed, including pipes, eccentric driven shafts, and other auxiliary components. During the construction process, the assembly function in SOLIDWORKS is used to ensure that the relative positions and constraint relationships of each component meet the design requirements. Through the precise splicing and assembly of the components, a complete three-dimensional cold water pipe structure model is generated, and finally, the geometric model of the N-type eccentric driven shaft cold water pipe is constructed.

[0062] Step S2: Import the geometric model of the N-type eccentric driven shaft cold water pipe into the fluid flow simulation module corresponding to the fluid dynamics precise calculation software ANSYS FLUENT to determine that the fluid domain corresponding to the structure of the eccentric driven shaft cold water pipe is standard A turbulence model is used to calculate the fluid Reynolds number to obtain the Reynolds number. By setting the inlet and outlet boundary conditions of the cold water pipe and the heat transfer coefficients, thermal radiation coefficients, and heat source thermal conditions between the corresponding end faces of the eccentric driven shaft components and the air and the environment, and performing a thermal coupling simulation modeling on the geometric model of the N-type eccentric driven shaft cold water pipe to generate a thermal-fluid coupling simulation calculation model of the eccentric driven shaft.

[0063] In an embodiment of the present invention, the previously established geometric model of the N-type eccentric driven shaft cold water pipe is imported into the fluid dynamics precise calculation software ANSYS FLUENT. A three-dimensional geometric model of the N-type eccentric driven shaft cold water pipe is constructed using CAD modeling software (such as SolidWorks or AutoCAD). A new project is created in ANSYS Workbench, the geometric model is imported, and the fluid domain is defined in the fluid flow simulation module. By defining the inner and outer surfaces of the pipe and the corresponding boundary conditions, it is ensured that the geometric shape of the model is exactly the same as the actual pipe structure. An appropriate fluid domain is selected for regional division to ensure that the flow region is precisely matched with the space inside the pipe. Thereafter, the standard turbulence model is selected as the fluid flow simulation model of the pipe, and the Reynolds number is calculated. First, according to the known fluid flow rate , the cold water pipe wall coefficient and the fluid kinematic viscosity , the formula is used to 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 and flow velocity distribution of the inner surface of the pipe. The kinematic viscosity μ is determined by the temperature and properties of the fluid. The magnitude of the Reynolds number R can be used to judge the flow state, and according to the standard The hydrodynamic characteristics calculated by the turbulence model are further used to set the inlet and outlet boundary conditions of the cold water pipeline of the N-type eccentric driven shaft. By using the built-in fluid simulation tool in ANSYS FLUENT, the flow velocity, pressure, and temperature distributions at the inlet and outlet of the pipeline are set to obtain the inlet and outlet boundary conditions of the cold water pipeline. At the same time, by configuring the heat transfer model between air convection and environmental thermal radiation in ANSYS FLUENT, the heat exchange process between the cold water pipeline and the environment is simulated. A suitable heat transfer model (such as natural convection or forced convection) is selected, and parameters such as the heat transfer coefficient and thermal radiation coefficient between air and the environment are set in the model. On this basis, thermal condition mapping is set for the components of the N-type eccentric driven shaft (such as eccentric bearings), and factors such as heat flow distribution and radiative heat dissipation are mapped to the corresponding parts, so as to set the heat transfer coefficient, thermal radiation coefficient, and heat source thermal conditions between the end faces of the corresponding components of the eccentric driven shaft and air and the environment. Then, based on the previously set inlet, outlet boundary conditions, and heat exchange coefficients, a thermal-fluid coupling simulation model of the cold water pipeline is established. In ANSYS FLUENT, the thermal-fluid coupling method is used to combine the fluid flow and heat transfer models. This process requires considering the thermophysical properties of the fluid, such as specific heat and thermal conductivity, to ensure that the mutual influence between heat and flow is accurately reflected in the simulation. By modeling the heat exchange process between the fluid in the cold water pipeline 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.

[0064] Step S3: Perform cross-mesh division on the interface between the outer surface and the inner surface of the cold water pipeline in the thermal-fluid coupling simulation calculation model of the eccentric driven shaft, and simulate and analyze the heat exchange conditions of the heat exchange process between the fluid flow and the solid components inside and outside the cold water pipeline in the thermal-fluid coupling simulation calculation model of the eccentric driven shaft by setting the thermal physical property parameters of the cold water pipeline material and the operating parameters of the main motor, so as to generate the heat exchange simulation process between the fluid domain and the solid domain inside and outside the cold water pipeline;

[0065] In the embodiments of the present invention, when performing the thermal-fluid coupling simulation of the cold water pipeline of the eccentric driven shaft, first, the interface between the outer surface and the inner surface of the cold water pipeline needs to be established through the fluid dynamics precise calculation software ANSYS FLUENT, ensuring that all relevant components of the eccentric driven shaft and the cold water pipeline are included in the model. Next, the outer surface and the inner surface of the cold water pipeline are defined, and the coupling interface between the fluid domain and the solid domain is used to ensure the correct binding of the fluid domain and the solid domain. By combining the previously established binding interface between the inner and outer fluid domains and the solid domain of the cold water pipeline and setting the corresponding overall mesh division quality average value through the fluid dynamics precise calculation software ANSYS FLUENT, specifically 0.82, to meet the calculation conditions, cross-mesh division is performed between the corresponding outer surface and the inner surface of the cold water pipeline. To select the mesh division module and set the global mesh parameters of the model to 0.82, determine the mesh type (such as structured mesh or unstructured mesh) and the mesh density, and according to the complexity of the cold water pipeline and the geometric characteristics of the eccentric driven shaft, unstructured mesh is adopted 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 mesh division, the material thermal property parameters of the cold water pipeline need to be set according to the actual working conditions and the working environment. First, by collecting the working environment data of the cold water pipeline, including parameters such as ambient temperature, pressure, and flow rate, and combining the cooling requirements in the actual application, the physical properties of the cold water pipeline are accurately set. In the specific operation, for the materials of the cold water pipeline (such as stainless steel, copper, or composite materials, etc.), the thermal property parameters need to be set according to different material types in ANSYS FLUENT. By inputting the physical property parameters such as the density, specific heat capacity, thermal conductivity, and viscosity of the cold water pipeline material, ensure that these parameters are consistent with the actual working environment of the cold water pipeline. For example, when setting the thermal 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 in the system where the cold water pipe is located, it is first necessary to analyze the actual working environment of the cold water pipe, especially the operating conditions of the main motor. These parameters are usually obtained through the factory on-site monitoring system or equipment manuals. Specifically, first determine the working temperature of the main motor and record the power output of the main motor. In addition, the heat 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 working parameters of the main motor. Then, based on the material thermal property parameters of the cold water pipe and the working parameters of the main motor obtained in the previous steps, enter the heat exchange simulation analysis stage of the eccentric driven shaft heat-fluid coupling simulation calculation model. In specific implementation, use the heat-fluid coupling module of ANSYS FLUENT to simulate the heat exchange process of the cold water pipe. Set the hydrodynamic parameters such as the flow rate and temperature of the working fluid (such as cooling water) of the cold water pipe in the model, and combine the thermal property parameters of the material to calculate the temperature field and flow field. During the simulation process, combine the heat load of the main motor and the fluid temperature around the cold water pipe, and gradually carry out multi-physics field coupling simulation to simulate the heat exchange process between the internal and external fluids of the cold water pipe, and finally generate the heat exchange simulation process between the internal and external fluid domains and the solid domain of the cold water pipe.

[0066] Step S4: Set the convergence criterion, initialization function, solution controller, and iterative time steps through the hydrodynamic precision calculation software ANSYS FLUENT, and use the second-order coupled implicit algorithm to perform heat exchange iterative convergence solution on the heat exchange simulation process between the internal and external fluid domains and the solid domain of the cold water pipe, so as to obtain the fluid flow distribution of the cold water pipe, the internal pressure distribution of the cold water pipe, and the internal and external heat transfer coefficients of the cold water pipe; obtain the Prandtl number and Nusselt number, and conduct convective heat transfer derivation analysis on the internal and external heat transfer coefficients of the cold water pipe based on the Reynolds number, Prandtl number, and Nusselt number to obtain the convective heat transfer coefficient of the cold water pipe fluid; based on the fluid flow distribution of the cold water pipe, the internal pressure distribution of the cold water pipe, and the convective heat transfer coefficient of the cold water pipe fluid, use the post-processing software CFD Post to optimize the design of the corresponding eccentric driven shaft cold water pipe structure to generate the optimized structure of the eccentric driven shaft cold water pipe.

[0067] In the embodiments of the present invention, for the simulation analysis of heat exchange between the fluid domains inside and outside the cold water pipe and the solid domain by using ANSYS FLUENT, various parameters in the simulation process need to be set and initialized first. At this time, through the graphical user interface of ANSYS FLUENT, select the corresponding physical model, enter the solution settings interface. Setting the convergence criterion is a key step to ensure the stable convergence of numerical calculations. Usually, the convergence criteria of multiple physical quantities such as the residual size and mass, momentum, and energy are selected. The residual value is generally set to Next, the setting of the initialization function is crucial before the start of model solution. Usually, the standard initialization method is 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 settings determine 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 adopted. According to the size of the cold water pipe and the fluid conditions, appropriate iterative time steps are set , usually a stable time step based on the flow velocity of the cold water pipe is selected. Specifically, the heat exchange iteration convergence calculation results are saved every 10 steps, and a total of 1000 steps of iteration are performed, so as to set the corresponding convergence criterion, initialization function, solution controller, and iterative time steps. Secondly, in the heat exchange simulation between the fluid domains inside and outside the cold water pipe and the solid domain, combined with the previously set convergence criterion, initialization function, solution controller, and iterative time steps, and using the second-order coupled implicit algorithm to iteratively solve the heat exchange process. At this time, using the solution function of ANSYS FLUENT, after setting appropriate boundary conditions and initial conditions, start to execute the heat exchange simulation process. Using 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, focus on observing the changes in the fluid flow distribution, the internal pressure distribution of 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 criterion meets the set standard (for example, the residual is less than ), it can be considered that the simulation process converges, thus obtaining the fluid flow distribution in the cold water pipe, the internal pressure distribution in the cold water pipe, and the heat transfer coefficient inside and outside the cold water pipe. At the same time, according to the flow conditions and heat exchange characteristics of the cold water pipe, the Prandtl number (Pr) and Nusselt number (Nu) are calculated and obtained. The Prandtl number is a dimensionless value that describes the relative intensity of the viscous diffusion and thermal diffusion of a fluid, usually calculated from the specific heat capacity, viscosity, and thermal conductivity of the fluid. The Nusselt number is a dimensionless value that describes the convective heat transfer ability of a fluid. It is closely related to the Prandtl number and 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 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 or laminar), 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 classical convective heat transfer relationship is analyzed, where 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 respectively. On this basis, combining 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, thus 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 pipe, it enters the pipeline structure optimization design stage. 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 pipe, a three-dimensional model distribution cloud map of the eccentric driven shaft cold water pipe is established through CFD Post, and the geometric dimensions are adjusted and optimized. In the specific operation process, first, the basic geometric parameters of the cold water pipe, such as the inner diameter, outer diameter, and wall thickness of the pipe, are input. Then, the hydrodynamic parameters of the pipe under different flow states (such as flow velocity, pressure, temperature, etc.) are input, and CFD Post is used for post-processing of the flow field and thermal field of the pipe to analyze the influence of different geometric shapes on the fluid flow and heat exchange efficiency. By gradually adjusting the geometric shape and structure of the pipe, the hydrodynamic performance of the pipe is optimized, and an optimized structure model of the eccentric driven shaft cold water pipe is generated. This model can be further used for actual production or experimental verification to ensure that the pipe design has better heat exchange performance and fluid flow efficiency, and finally an optimized structure of the eccentric driven shaft cold water pipe is generated.

[0068] Furthermore, as an embodiment of the present invention, referring toFigure 2 As shown in Figure 1 the detailed step - by - step schematic diagram of step S1 in

[0069] Step S11: Obtain the assembly drawing of the N - type eccentric driven shaft cold - water pipeline structure;

[0070] In the embodiment of the present invention, according to the design requirements and system requirements, the assembly drawing of the N - type eccentric driven shaft cold - water pipeline structure is obtained. This drawing should be a standard CAD format file, such as DWG, DXF, etc., which can provide the spatial positions, connection relationships, and dimensions of the complete pipeline system and each component of the eccentric driven shaft. When obtaining the assembly drawing, it is necessary to ensure the scale, legend, annotation, and clarity of the view of the drawing for subsequent precise measurement and modeling. If the drawing is in paper form, it can be digitized using a scanner, converted into an editable image file, and then imported into CAD software and digitally repaired to ensure that every detail is correct. Finally, the assembly drawing of the N - type eccentric driven shaft cold - water pipeline structure is obtained.

[0071] Step S12: Precisely measure the geometric dimensions of each eccentric driven shaft component in the assembly drawing of the N - type eccentric driven shaft cold - water pipeline structure to obtain the corresponding structural geometric dimension parameters of each eccentric driven shaft component, including the length, width, and height corresponding to each eccentric driven shaft component;

[0072] In the embodiment of the present invention, in the obtained assembly drawing of the N - type eccentric driven shaft cold - water pipeline structure, the geometric dimensions of each component are precisely measured. By using professional CAD software (such as AutoCAD) to magnify the drawing and view the details, and using the measurement tools in the software (such as distance measurement, angle measurement, etc.), the length, width, and height of each component are measured one by one. Special attention should be paid to the connection positions of the components, the positions of the eccentric shaft centerlines, and the relative dimension relationships 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. Finally, the corresponding structural geometric dimension parameters of each eccentric driven shaft component are obtained, including the length, width, and height corresponding to each eccentric driven shaft component.

[0073] Step S13: Obtain the material physical properties corresponding to each eccentric driven shaft component, and based on the material physical properties corresponding to each eccentric driven shaft component, conduct a refined geometric shape analysis on the corresponding eccentric driven shaft components in the assembly drawing of the N - type eccentric driven shaft cold - water pipeline structure to obtain the corresponding structural geometric shape parameters of each eccentric driven shaft component, including the shape size, shape curvature, and shape surface flatness corresponding to each eccentric driven shaft component;

[0074] In an embodiment of the present invention, according to the types of component materials marked in the assembly drawing of the N-type eccentric driven shaft cold water pipeline, the material physical properties of each component are collected, such as density, elastic modulus, tensile strength, thermal expansion coefficient, etc. These data can usually be obtained through material manuals or relevant material databases. If they cannot be directly obtained, it is necessary to communicate with relevant material suppliers. After obtaining the physical properties of the materials, based on these properties, a refined analysis of the geometric shape of the components is carried out. 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 components is further optimized to ensure its adaptation to the actual working environment and achieve ideal mechanical properties, durability, and stability, thereby generating accurate geometric shape parameters, including shape size, shape curvature, surface flatness, etc. Finally, the structural geometric shape parameters corresponding to each eccentric driven shaft component are obtained, including the shape size, shape curvature, and shape surface flatness corresponding to each eccentric driven shaft component.

[0075] Step S14: Obtain the structural layout and constraint relationship between each eccentric driven shaft component within the cold water pipeline structure through the assembly drawing of the N-type eccentric driven shaft cold water pipeline structure, and calculate 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 within the cold water pipeline structure, so as to obtain the structural eccentric shaft position corresponding to each eccentric driven shaft component.

[0076] In an embodiment of the present invention, based on the assembly drawing of the N-type eccentric driven shaft cold water pipeline structure, the relative positions and constraint relationships of each component are determined. The specific steps include analyzing the connection methods (such as welding, bolt connection, etc.), relative positions (such as eccentric angle, distance, etc.), and force transmission paths 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 central axis position of the eccentric driven shaft relative to other components, and the hydrodynamic characteristics within 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 positions of each component to obtain accurate spatial coordinates. This step ensures the accurate relative positions of each component during subsequent modeling and guarantees that the eccentric shaft design meets the engineering requirements. Finally, the structural eccentric shaft positions corresponding to each eccentric driven shaft component are obtained.

[0077] Step S15: Use the three-dimensional modeling software SOLIDWORKS to perform three-dimensional geometric construction on the assembly drawing of the N-type eccentric driven shaft cold water pipeline structure based on the structural geometric dimension parameters, structural geometric shape parameters, and structural eccentric shaft positions corresponding to each eccentric driven shaft component, so as to generate a geometric model of the N-type eccentric driven shaft cold water pipeline.

[0078] In the embodiment of the present invention, after completing the foregoing steps, the three-dimensional geometry of the cold water pipe structure of the N-type eccentric driven shaft is constructed using the three-dimensional modeling software SOLIDWORKS. First, the previously obtained geometric dimension parameters and geometric shape parameters are input into SOLIDWORKS, and the spatial coordinates of the components are set according to the calculated position of the eccentric shaft. Through the modeling tools of SOLIDWORKS, the three-dimensional models of each component are gradually constructed, including pipes, eccentric driven shafts, and other auxiliary components. During the construction process, the assembly function in SOLIDWORKS is used to ensure that the relative positions and constraint relationships of the components meet the design requirements. Through the precise splicing and assembly of the components, a complete three-dimensional cold water pipe structure model is generated, and through the analysis module of SOLIDWORKS, the three-dimensional model is simulated and tested to verify its performance in actual work, ensuring the reliability and practicality of the model. If necessary, the model parameters are further optimized and the design defects are corrected, thereby completing the construction of the three-dimensional geometric model of the N-type eccentric driven shaft cold water pipe, and finally constructing and generating the geometric model of the N-type eccentric driven shaft cold water pipe.

[0079] Further, the calculation of the position of the eccentric shaft in step S14 is quantitatively calculated through the structural eccentric shaft position calculation formula. Among them, the specific structural eccentric shaft position calculation formula is:

[0080] ;

[0081] In the formula, is the structural eccentric shaft position corresponding to the th 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 eccentric shaft position variable parameter, is the th eccentric driven shaft component at the position corresponding structural acting force, is the th eccentric driven shaft component at the position corresponding radial distance of the eccentric shaft, is the th eccentric driven shaft component at the position corresponding rotation angle of the eccentric shaft, is the total number of constraints between each eccentric driven shaft component, is the th stiffness coefficient corresponding to the constraint between each eccentric driven shaft component, For the structural deformation corresponding to the th constraint between each eccentric follower shaft component at the position corresponding thereto, is an exponential function, is the radial friction attenuation factor of the eccentric follower shaft component, is the correction coefficient of the structural eccentric shaft position.

[0082] The present invention has obtained a structural eccentric shaft position calculation formula through the use of a specific mathematical model and verification, which is used to calculate the eccentric shaft position of the corresponding eccentric follower shaft components. This structural eccentric shaft position calculation formula comprehensively considers the structural forces, radial distances, rotation angles of each component, and the constraints between them, making the calculation of the eccentric shaft position more accurate. Such accuracy is crucial for ensuring the stability and safety of the entire cold water pipeline system. By adopting an integrated calculation method, the influences of multiple factors are considered, including the physical properties of materials, the geometric characteristics of components, and their interactions. This comprehensive analysis can provide a more comprehensive design basis. The eccentric shaft position obtained through calculation can provide data support for design optimization, which can help engineers discover and modify potential unreasonable designs in a timely manner during the design stage, thereby improving the performance of the overall structure. The consideration of the shape parameters and constraint relationships introduced in this calculation formula enables detailed shape and layout analysis 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. To sum up, this formula fully considers the structural eccentric shaft position corresponding to the th eccentric follower shaft component, the total number of the eccentric follower shaft components, the total mass of the cold water pipeline structure of the eccentric follower shaft, the length of the cold water pipeline, the eccentric follower shaft position variable parameter the th eccentric follower shaft component at the position corresponding structural force the th eccentric follower shaft component at the position corresponding eccentric shaft radial distance the th eccentric follower shaft component at the position corresponding eccentric shaft rotation angle the total number of the constraints between each eccentric follower shaft component, the th constraint corresponding stiffness coefficient between each eccentric follower shaft component, the The structural deformation corresponding to a constraint at the position is , the exponential function , the radial friction attenuation factor of the eccentric follower shaft component , the correction coefficient of the structural eccentric shaft position , according to the th eccentric follower shaft component, the corresponding structural eccentric shaft position and the mutual correlation relationship between the above parameters constitute a functional relationship:

[0083] ;

[0084] This formula can realize the calculation process of the eccentric shaft position of the corresponding eccentric follower shaft component. At the same time, through the correction coefficient of the structural eccentric shaft position, it can be adjusted according to the error situation in the calculation process, so as to improve the accuracy and applicability of the structural eccentric shaft position calculation formula.

[0085] Furthermore, step S2 includes the following steps:

[0086] Step S21: Import the geometric model of the N-type eccentric follower shaft cold water pipeline into the fluid flow simulation module corresponding to the fluid dynamics precise calculation software ANSYS FLUENT, and set the fluid domain corresponding to the structure of the eccentric follower shaft cold water pipeline in the N-type eccentric follower shaft cold water pipeline geometric model as the standard turbulence model;

[0087] In the embodiment of the present invention, by importing the previously established geometric model of the N-type eccentric follower shaft cold water pipeline into the fluid dynamics precise calculation software ANSYS FLUENT, first use CAD modeling software (such as SolidWorks or AutoCAD) to construct a three-dimensional geometric model of the N-type eccentric follower 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 ensure that the geometric shape of the model is exactly the same as the actual pipeline structure by defining the inner and outer surfaces of the pipeline and the corresponding boundary conditions, select an appropriate fluid domain for regional division to ensure that the flow area is accurately matched with the space inside the pipeline. After that, select the standard turbulence model as the fluid flow simulation model of this pipeline, and this model can provide sufficient accuracy to describe the turbulence phenomenon in the N-type eccentric follower shaft cold water pipeline.

[0088] Step S22: Calculate the fluid Reynolds number for the standard turbulence model to obtain the Reynolds number , where is the standard The fluid flow rate corresponding to the turbulence model is the standard The wall coefficient of the cold water pipe corresponding to the turbulence model is the standard The kinematic viscosity of the fluid corresponding to the turbulence model

[0089] In the embodiment of the present invention, in the hydrodynamic simulation, the standard turbulence model configured by ANSYS FLUENT is used to calculate the Reynolds number. First, according to the known fluid flow rate , the wall coefficient of the cold water pipe and the kinematic viscosity of the fluid , the formula is used to 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 and velocity distribution of the inner surface of the pipe. The kinematic viscosity μ is determined by the temperature and properties of the fluid. The magnitude 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.

[0090] Step S23: Obtain the hydrodynamic characteristics of the cold water pipe through the standard turbulence model corresponding to the geometric model of the N-type eccentric driven shaft cold water pipe, and set the inlet and outlet boundary conditions of the N-type eccentric driven shaft cold water pipe geometric model based on the hydrodynamic characteristics of the cold water pipe, so as to set the inlet and outlet boundary conditions of the cold water pipe, including the flow velocity, temperature distribution and pressure distribution corresponding to the inlet and outlet of the cold water pipe;

[0091] In the embodiment of the present invention, based on the hydrodynamic characteristics calculated by the standard turbulence model, the inlet and outlet boundary conditions of the N-type eccentric driven shaft cold water pipe are further set, so as to set the flow velocity, pressure and temperature distribution at the inlet and outlet of the pipe by using the built-in fluid simulation tool of ANSYS FLUENT. The flow velocity can be determined by the 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 the boundary conditions, the simulation accuracy of the fluid flow and heat transfer process can be ensured, and finally the inlet and outlet boundary conditions of the cold water pipe are obtained, including the flow velocity, temperature distribution and pressure distribution corresponding to the inlet and outlet of the cold water pipe.

[0092] Step S24: Configure the heat transfer model between air convection and environmental thermal radiation through the hydrodynamic precision calculation software ANSYS FLUENT, and perform thermal condition mapping settings on the corresponding eccentric driven shaft components within the geometric model of the N-type eccentric driven shaft cold water pipe 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 source thermal conditions between the corresponding end faces of the eccentric driven shaft components and the air and the environment;

[0093] In the embodiment of the present invention, 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 parameters such as the heat transfer coefficient and thermal radiation coefficient between the air and the environment in the model. Specifically, by specifying the heat exchange conditions of the outer surface of the pipe in contact with the air, the heat exchange effect between the cold water pipe and the surrounding environment is obtained. On this basis, 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 flow distribution and radiative 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, and finally the heat transfer coefficient, thermal radiation coefficient, and heat source thermal conditions between the corresponding end faces of the eccentric driven shaft components and the air and the environment are set.

[0094] Step S25: Perform thermal coupling simulation modeling on the geometric model of the N-type eccentric driven shaft cold water pipe based on the inlet and outlet boundary conditions of the cold water pipe, heat transfer coefficient, thermal radiation coefficient, and heat source thermal conditions, so as to generate a thermal-fluid coupling simulation calculation model of the eccentric driven shaft.

[0095] In the embodiment of the present invention, through the thermal-fluid coupling simulation modeling of the cold water pipe based on the previously set inlet and outlet boundary conditions and heat exchange coefficient, in ANSYS FLUENT, the thermal-fluid coupling method is used to combine the fluid flow and heat transfer models. This process requires considering the thermophysical properties of the fluid, such as specific heat, thermal conductivity, etc., to ensure that the mutual influence between 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. The simulation model provides a basis for the optimized design, can predict the thermal characteristics such as the temperature distribution and thermal stress of the pipe and its components, and helps to improve the design and operating efficiency of the cold water pipe, and finally generates a thermal-fluid coupling simulation calculation model of the eccentric driven shaft.

[0096] Further, step S3 includes the following steps:

[0097] Step S31: Use the fluid dynamics precise calculation software ANSYS FLUENT to establish an interface between the outer surface and the inner surface of the cold water pipe within the eccentric driven shaft thermal-fluid coupling simulation calculation model, so as to generate a bonded interface between the fluid domains and the solid domain inside and outside the cold water pipe;

[0098] In the embodiment of the present invention, when performing the thermal-fluid coupling simulation of the eccentric driven shaft cold water pipe, first, the fluid dynamics precise calculation software ANSYS FLUENT is used to establish an interface between the outer surface and the inner surface of the cold water pipe. Specifically, when operating, first, a three-dimensional geometric model needs to be constructed in 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 domain and the solid domain 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 transfer of heat and the interaction of fluid dynamics in the thermal-fluid coupling calculation. By defining these interfaces, ANSYS FLUENT can perform an accurate fluid-solid coupling analysis in the subsequent steps, and finally generate a bonded interface between the fluid domains and the solid domain inside and outside the cold water pipe.

[0099] Step S32: Based on the bonded interface between the fluid domains and the solid domain inside and outside the cold water pipe, use the fluid dynamics precise calculation software ANSYS FLUENT to set the corresponding overall mesh division quality average value to perform cross-mesh division between the outer surface and the inner surface of the cold water pipe within 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;

[0100] In an embodiment of the present invention, by combining the previously established bonded interface between the internal and external fluid domains and the solid domain of the cold water pipe and setting the corresponding overall mesh division quality average value to 0.82 by using the fluid dynamics precise calculation software ANSYS FLUENT to meet the calculation conditions, cross-mesh division is performed between the outer surface and the inner surface of the corresponding cold water pipe. The mesh division 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. According to the complexity of the cold water pipe and the geometric characteristics of the eccentric driven shaft, unstructured mesh is adopted to adapt to the complex shape, and at the same time, the mesh quality at the interface is ensured to be uniform. When setting the mesh division, local mesh refinement is performed for the interface between the outer surface and the inner surface of the cold water pipe to improve the analysis accuracy at the interface, and a cross-mesh model that meets the requirements of fluid-structure interaction 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. Finally, an eccentric driven shaft thermal-fluid coupling fluid-structure cross-mesh model is generated.

[0101] Step S33: Obtain the working environment and actual working conditions corresponding to the cold water pipe, and accurately set the thermal physical properties parameters of the material used for the cold water pipe in the eccentric driven shaft thermal-fluid coupling fluid-structure cross-mesh model based on the working environment and actual working conditions corresponding to the cold water pipe to obtain the thermal physical properties parameters of the cold water pipe material, including density, specific heat capacity, thermal conductivity, and viscosity.

[0102] In an embodiment of the present invention, after the mesh division is completed, the thermal physical properties parameters of the cold water pipe material need to be set according to the actual working conditions and the working environment. First, by collecting the working environment data of the cold water pipe, including parameters such as environmental temperature, pressure, and flow rate, and combining the cooling requirements in actual applications, the physical properties of the cold water pipe are accurately set. In specific operations, for the material of the cold water pipe (such as stainless steel, copper, or composite materials, etc.), its thermal physical properties parameters need to be set according to different material types in ANSYS FLUENT. By inputting the physical property parameters such as the density, specific heat capacity, thermal conductivity, and viscosity of the cold water pipe material, it is ensured that these parameters are consistent with the actual working environment of the cold water pipe. For example, when setting the thermal 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) can be input according to the standard material database. This process provides reliable data support for the subsequent heat exchange simulation through accurate material parameter settings, and finally obtains the thermal physical properties parameters of the cold water pipe material, including density, specific heat capacity, thermal conductivity, and viscosity.

[0103] Step S34: Obtain the working parameters of the main motor corresponding to the cold water pipeline, including the working temperature of the main motor, the power output of the main motor, and the heat load of the main motor;

[0104] In the 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 manuals. Specifically, first determine the working temperature of the main motor. Usually, the temperature range can be found in the motor's specification sheet, and further monitor the real-time data through a temperature sensor. Then, record the power output of the main motor, which can be obtained from the rated power of the motor and the actual load operation data. In addition, the heat load of the motor is also a key parameter, usually calculated by the difference between the power input and the output power of the motor. Considering that there will be a certain amount of heat loss during the operation of the motor, after inputting these working parameters into ANSYS FLUENT, it provides the necessary boundary conditions and input data for the subsequent simulation analysis of the heat exchange working conditions, and finally obtains the corresponding working parameters of the main motor, including the working temperature of the main motor, the power output of the main motor, and the heat load of the main motor.

[0105] Step S35: Based on the thermal physical property parameters of the cold water pipeline material and the working parameters of the main motor, use the fluid dynamics precise calculation software ANSYS FLUENT to conduct a heat exchange working condition simulation analysis on the heat transfer process between the internal and external fluids of the cold water pipeline and the solid components in the eccentric driven shaft heat flow coupling fluid-solid cross-grid model, so as to generate a heat exchange simulation process between the internal and external fluid domains and the solid domain of the cold water pipeline.

[0106] In the embodiment of the present invention, based on the thermal physical property parameters of the cold water pipeline and the working parameters of the main motor obtained in the previous steps, enter the heat exchange simulation analysis stage of the eccentric driven shaft heat flow coupling simulation calculation model. Specifically, when implementing, use the heat flow coupling module of ANSYS FLUENT to simulate the heat exchange process of the cold water pipeline. Set the fluid dynamics parameters such as the flow rate and temperature of the working fluid (such as cooling water) of the cold water pipeline in the model, and combine the thermal physical property parameters of the material to calculate the temperature field and flow field. During the simulation process, combine the heat load of the main motor and the fluid temperature around the cold water pipeline, and gradually conduct multi-physical field coupling simulation to simulate the heat exchange process between the internal and external fluids of the cold water pipeline. In this process, use steady-state or transient analysis to simulate the heat transfer and distribution of the cold water pipeline 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 internal and external fluid domains and the solid domain of the cold water pipeline.

[0107] Further, step S4 includes the following steps:

[0108] Step S41: Set the convergence criterion, initialization function, solution controller, and iterative time steps for the heat exchange simulation process between the fluid domains and the solid domain inside and outside the cold water pipe through the hydrodynamic precision calculation software ANSYS FLUENT;

[0109] In the embodiment of the present invention, when performing heat exchange simulation analysis between the fluid domains and the solid domain inside and outside the cold water pipe by using ANSYS FLUENT, it is first necessary to set and initialize various parameters in the simulation process. At this time, through the graphical user interface of ANSYS FLUENT, select the corresponding physical model, enter the solution settings interface. Setting the convergence criterion is a key step to ensure the stable convergence of numerical calculations. Usually, the convergence criteria of multiple physical quantities such as residual size and mass, momentum, and energy are selected. The residual value is generally set to Next, the setting of the initialization function is crucial before the start of model solution. Usually, the standard initialization method is 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 adopted. According to the size and fluid conditions of the cold water pipe, appropriate iterative time steps are set. Usually, a stable time step based on the flow velocity of the cold water pipe is selected. Specifically, the heat exchange iteration convergence calculation results are saved every 10 steps, and a total of 1000 steps of iteration are performed to ensure the stability and accuracy of the calculation process. The time steps generally range from a few milliseconds to several seconds. Finally, the corresponding convergence criterion, initialization function, solution controller, and iterative time steps are set.

[0110] Step S42: Based on the convergence criterion, initialization function, solution controller, and iterative time steps, and using the second-order coupled implicit algorithm, perform heat exchange iterative convergence solution for the heat exchange simulation process between the fluid domains and the solid domain inside and outside the cold water pipe to obtain the fluid flow distribution in the cold water pipe, the internal pressure distribution in the cold water pipe, and the heat transfer coefficient inside and outside the cold water pipe;

[0111] In the embodiment of the present invention, in the heat exchange simulation of the fluid domain and the solid domain inside and outside the cold water pipe, by combining the previously set convergence criterion, initialization function, solution controller, and iterative time steps, and using the second-order coupled implicit algorithm to iteratively solve the heat exchange process. 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 the solid domain, ensuring the stability and efficiency of the calculation. During the iterative convergence process, the focus is on observing the fluid flow distribution, the internal pressure distribution of the pipe, and the change of the heat transfer coefficient inside and outside the cold water pipe. In each iteration, ANSYS FLUENT updates the solution results by calculating the velocity field, pressure field, and temperature field of the fluid, gradually approaching the real heat exchange state. Once the convergence criterion meets the set standard (for example, the residual is less than ), it can be considered that the simulation process converges, and finally, the fluid flow distribution of the cold water pipe, the internal pressure distribution of the cold water pipe, and the heat transfer coefficient inside and outside the cold water pipe are obtained.

[0112] Step S43: Obtain the Prandtl number and the Nusselt number;

[0113] In the 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 condition 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, usually calculated from the specific heat capacity, viscosity, and thermal conductivity of the fluid. Through the post-processing function provided by ANSYS FLUENT, 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 ability 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, combining the flow velocity, temperature, and physical properties of the fluid, accurate Prandtl number and Nusselt number can be obtained.

[0114] Step S44: Conduct a convective heat transfer derivation analysis on the heat transfer coefficient inside and outside the cold water pipe based on the Reynolds number, Prandtl number, and Nusselt number to obtain the convective heat transfer coefficient of the cold water pipe fluid , , where is the Nusselt number, is the fluid thermal conductivity, 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 cold water pipe flow state, is the Prandtl number, is the empirical constant for the shape of the inner and outer heat exchange surfaces of the cold water pipe;

[0115] 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 by 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 coefficients inside and outside the cold water pipe. Specifically, based on the Reynolds number, Prandtl number, and Nusselt number of the fluid, the classical convective heat transfer relationship is analyzed, where 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 the empirical constants based on the flow state respectively. 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 coefficients under different flow conditions, it can provide an important basis for the subsequent optimization of the pipe structure, ensure the maximization of the heat transfer effect, and finally obtain the convective heat transfer coefficient of the cold water pipe fluid.

[0116] Step S45: Based on the fluid flow distribution of the cold water pipe, the internal pressure distribution of the cold water pipe, and the convective heat transfer coefficient of the cold water pipe fluid, use the post-processing software CFD Post to optimize the design of the corresponding eccentric driven shaft cold water pipe structure to generate an optimized structure of the eccentric driven shaft cold water pipe.

[0117] In the embodiment of the present invention, after obtaining the flow distribution, pressure distribution, and convective heat transfer coefficient of the cold water pipe, it enters the stage of pipe structure optimization design. 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 pipe, a three-dimensional model of the eccentric driven shaft cold water pipe is established by CFD Post, and the geometric dimensions are adjusted and optimized. In the specific operation process, first input the basic geometric parameters of the cold water pipe, such as the inner diameter, outer diameter, and wall thickness of the pipe, then input the fluid mechanics parameters (such as flow velocity, pressure, temperature, etc.) of the pipe under different flow states, and use CFD Post to post-process the flow field and thermal field of the pipe, analyze the influence of different geometric shapes on the fluid flow and heat exchange efficiency, and optimize the hydrodynamic performance of the pipe by gradually adjusting the geometric shape and structure of the pipe to generate an optimized structure model of the eccentric driven shaft cold water pipe. This model can be further used for actual production or experimental verification to ensure that the pipe design has better heat exchange performance and fluid flow efficiency, and finally generate an optimized structure of the eccentric driven shaft cold water pipe.

[0118] Furthermore, the second-order coupled implicit algorithm in step S42 is specifically as follows:

[0119] ;

[0120] ;

[0121] ;

[0122] ;

[0123] ;

[0124] ;

[0125] ;

[0126] In the formula, is the fluid velocity vector distribution of the cold water pipe, is the fluid density of the cold water pipe, is the instantaneous time of the fluid in the cold water pipe, is the Laplace operator, is the internal pressure distribution of the cold water pipe, is the dynamic viscosity of the fluid in the cold water pipe, is the external force of the cold water pipe, is the heat exchange force term between the inside and outside of the cold water pipe at time is the fluid temperature of the cold water pipe, is the thermal conductivity of the fluid in the cold water pipe, is the internal heat source in the fluid domain of the cold water pipe at time 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 of the cold water pipe, is the internal heat source of the cold water pipe solid at time is the cold water pipe fluid flow distribution corresponding to the th iteration time step, is the cold water pipe fluid flow distribution corresponding to the th iteration time step, is the iteration time step, is the implicit update term of hydrodynamics, is the ​​​The fluid temperature distribution of the cold water pipe corresponding to the time step of the is the fluid temperature distribution of the cold water pipe corresponding to the time step of the is the implicit update term of 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 between the inside and outside of the cold water pipe.

[0127] The present invention obtains a second-order coupled implicit algorithm through the use of a specific mathematical model and verification, which is used for heat exchange iterative convergence solution in the heat exchange simulation process between the fluid domain and the solid domain inside and outside the cold water pipe. This algorithm fully considers the fluid velocity vector distribution of the cold water pipe , the fluid density of the cold water pipe , the instantaneous time of the fluid in the cold water pipe , the Laplace operator , the internal pressure distribution of the cold water pipe , the dynamic viscosity of the fluid in the cold water pipe , the external force of the cold water pipe , at time the heat exchange force term between the inside and outside of the cold water pipe , the fluid temperature of the cold water pipe , the thermal conductivity of the fluid in the cold water pipe , at time the internal heat source in the fluid domain of the cold water pipe , the solid temperature of the cold water pipe , the relative velocity vector distribution on the solid surface of the cold water pipe , the thermal conductivity of the solid of the cold water pipe , the heat exchange coefficient between the solid and the fluid of the cold water pipe , at time the internal heat source in the solid of the cold water pipe , the fluid flow distribution of the cold water pipe corresponding to the time step of the , the fluid flow distribution of the cold water pipe corresponding to the time step of the , the time step of the iteration , the implicit update term of fluid dynamics , the fluid temperature distribution of the cold water pipe corresponding to the time step of the , the fluid temperature distribution of the cold water pipe corresponding to the time step of the , the implicit update term of fluid heat exchange , the fluid friction factor , the length of the cold water pipe , the inner diameter of the cold water pipe , the heat transfer coefficient between the inside and outside of the cold water pipe , where by combining the fluid velocity vector distribution of the cold water pipe , the fluid density of the cold water pipe , the instantaneous time of the cold water pipe fluid , the Laplace operator , the internal pressure distribution of the cold water pipe , the dynamic viscosity of the cold water pipe fluid , the external force of the cold water pipe and at time , the heat exchange force term between the inside and outside of the cold water pipe constitute a functional relationship of the fluid momentum equation , where by combining the fluid velocity vector distribution of the cold water pipe , the instantaneous time of the cold water pipe fluid , the Laplace operator , the fluid temperature of the cold water pipe , the thermal conductivity of the cold water pipe fluid and at time , the internal heat source in the fluid domain of the cold water pipe constitute a functional relationship of the heat conduction equation in the fluid domain , by combining the solid temperature of the cold water pipe , the relative velocity vector distribution on the solid surface of the cold water pipe , the thermal conductivity of the cold water pipe solid , the heat exchange coefficient between the cold water pipe solid and the fluid , at time , the internal heat source of the cold water pipe solid , the instantaneous time of the cold water pipe fluid , the Laplace operator and the fluid temperature of the cold water pipe constitute a functional relationship of the heat conduction equation in the solid domain , by combining the fluid flow distribution of the cold water pipe corresponding to the th iteration time step , the th iteration time step corresponding fluid flow distribution of the cold water pipe , the iteration time step , the implicit update term of fluid dynamics , the th iteration time step corresponding fluid temperature distribution of the cold water pipe , the th iteration time step corresponding fluid temperature distribution of the cold water pipe and the implicit update term of fluid heat exchange constitute the corresponding iterative update function relation , , and by combining the fluid friction factor , the length of the cold water pipe , the inner diameter of the cold water pipe , the fluid velocity vector distribution of the cold water pipe and the fluid density of the cold water pipe constitute a functional relationship of the internal pressure distribution of the cold water pipe , , meanwhile, by combining the fluid temperature of the cold water pipe , the solid temperature of the cold water pipe , at time the internal heat source in the fluid domain of the cold water pipe and at time the internal heat source in the solid of the cold water pipe constitute a functional relationship of the heat transfer coefficient between the inside and outside of the cold water pipe , , this second-order coupled implicit algorithm improves the accuracy of the numerical solution through the double coupling of time and space, which means that the simulation of fluid flow and heat transfer phenomena is more realistic and accurate. Especially in the case of high flow velocity or large temperature difference, it can better capture the interaction between the fluid and the solid. The implicit algorithm has greater stability in time step compared with the explicit algorithm, allowing the use of larger time steps for calculation without causing numerical instability, which is particularly important for long-term and large-scale simulations as it can significantly save calculation time and resources. This algorithm can better handle various physical phenomena and boundary conditions, such as unsteady flow, variable temperature conditions, and complex geometries existing in cold water pipes. By coupling the formulas of fluid mechanics and heat conduction, it can effectively solve the interactive effects of multiple physical fields. Due to the adoption of the second-order coupling form, this algorithm can more comprehensively consider the various influences in the hydrodynamic equations, such as the coupling of momentum, energy, and momentum flow. This comprehensive consideration makes the solution of fluid flow distribution, pressure distribution, and heat transfer coefficient more accurate. Although the implicit scheme requires solving a system of linear equations, due to its faster convergence rate, when the problem is set properly (such as reasonable initial conditions and convergence criteria), the overall calculation efficiency is still higher than other methods. Especially in scenarios with complex geometries or multi-physics field coupling, the efficiency improvement is more significant. With the help of an accurate model of the fluid flow distribution and the heat exchange performance between the fluid domain and the solid domain, it can provide a scientific basis for the subsequent optimization of the pipeline structure. 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, capable of effectively capturing the rapidly changing flow field and temperature field, and providing reliable simulation support for dealing with dynamic working conditions. Through the application of the above steps, a more reasonable prediction of the heat transfer coefficient and fluid behavior can be obtained, providing basic data guarantee for the subsequent structural optimization design process.

[0128] Furthermore, step S45 includes the following steps:

[0129] Step S451: Use the post-processing software CFD Post to draw the fluid flow vector distribution of the cold water pipe fluid flow to generate a cloud map of the fluid velocity vector distribution inside the cold water pipe;

[0130] In the embodiment of the present invention, by using the CFD Post post-processing software to draw the vector distribution of the fluid flow in the cold water pipeline, the velocity data of the internal fluid of the cold water pipeline is imported from the CFD calculation results, and multiple cross-sections in the pipeline are selected for analysis. In the software, the velocity vectors of the fluid are visualized, and appropriate parameter settings are selected, such as the flow velocity magnitude, direction, and color scale. The generated flow velocity vector distribution map shows the flow direction, flow velocity intensity, and its distribution law of the fluid in the cold water pipeline. In the figure, the acceleration and deceleration regions of the fluid in the pipeline can be clearly seen, and the regions with uneven flow velocity, eddy current regions, or regions with high local resistance can be identified. This process can not only locate the flow problem regions by comparing the flow velocity change trends, but also provide a basis for subsequent optimization of the pipeline design, and finally generate a cloud map of the fluid flow velocity vector distribution inside the cold water pipeline.

[0131] Step S452: Use the post-processing software CFD Post to draw the pressure distribution of the internal pressure of the cold water pipeline to generate a cloud map of the internal pressure distribution of the cold water pipeline;

[0132] In the embodiment of the present invention, by using the CFD Post post-processing software to analyze and draw the internal pressure distribution of the cold water pipeline, the pressure field distribution data in the CFD simulation calculation results is imported, and appropriate pipeline cross-sections or any regions inside the pipeline are selected, and the pressure values are mapped to the corresponding graphics. In CFD Post, by setting the color mapping, a pressure distribution map is generated, which can intuitively display the high and low changes of the pressure inside the pipeline. The pressure distribution cloud map will show the pressure change trend inside the pipeline, especially in the regions where the fluid flow changes, such as elbows, valves, flow channel contraction or expansion positions. The significant changes in pressure can be effectively identified through this graph. This process helps to analyze the hydrodynamic characteristics of the fluid in the cold water pipeline, timely discover the problem regions with excessive pressure drop, and finally generate a cloud map of the internal pressure distribution of the cold water pipeline.

[0133] Step S453: Use the post-processing software CFD Post to draw the convective heat transfer coefficient distribution of the cold water pipeline fluid to generate a convective heat transfer coefficient distribution map of the cold water pipeline;

[0134] In an embodiment of the present invention, in the heat exchange analysis of the cold water pipeline, the CFD Post post-processing software is used to draw the distribution of the convective heat transfer coefficient of the fluid in the cold water pipeline. First, the convective heat transfer coefficients of the fluid in each region of the pipeline are extracted from the CFD simulation results, and a specific region (such as the region where the pipe wall contacts 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 scale, thereby generating a convective heat transfer coefficient distribution map. This map reflects the heat exchange efficiency between the fluid in the pipeline and the pipe wall. Generally, in the regions where the fluid velocity is high, the heat exchange efficiency is high; while in the regions where the velocity is low, the heat exchange efficiency is low. By analyzing these distribution maps, the heat transfer performance of the cold water pipeline can be optimized, the regions with uneven heat transfer can be found, and finally, the convective heat transfer coefficient distribution map of the cold water pipeline is generated.

[0135] Step S454: Perform distribution law identification and analysis on the velocity vector distribution cloud map of the fluid inside the cold water pipeline, the pressure distribution cloud map inside the cold water pipeline, and the convective heat transfer coefficient distribution map of the cold water pipeline, so as to obtain the distribution laws corresponding to the fluid velocity, the pressure inside the pipe, and the convective heat transfer coefficient of the cold water pipeline.

[0136] In an embodiment of the present invention, through comprehensive analysis of the previously generated velocity vector distribution map, pressure distribution map, and convective heat transfer coefficient distribution map of the fluid inside the cold water pipeline, the distribution laws of different regions are identified. This process first conducts a comparative analysis of each map to identify the mutual relationship between the velocity, pressure, and convective heat transfer coefficient. By conducting a detailed analysis of the velocity vector map and combining the low-pressure and high-pressure regions of the pressure distribution map, the factors affecting the flow are further determined, such as the geometric shape of the pipeline, the viscosity of the fluid, etc. During the analysis of the convective heat transfer coefficient distribution map, attention needs to be paid to the regions with large temperature differences, because the convective heat transfer efficiency in these regions directly affects the overall heat transfer effect. By synthesizing the analysis results of these three aspects, the distribution laws of the fluid velocity, pressure, and convective heat transfer coefficient of the cold water pipeline can be obtained, and finally, the distribution laws corresponding to the fluid velocity, the pressure inside the pipe, and the convective heat transfer coefficient of the cold water pipeline are obtained.

[0137] Step S455: Obtain the structural design optimization objectives corresponding to the uniform flow field, significant pressure drop, and uniform convective coefficient distribution of the cold water pipeline, and based on the distribution laws corresponding to the fluid velocity, the pressure inside the pipe, and the convective heat transfer coefficient of the cold water pipeline, use the structural design optimization objectives to optimize the pipeline structure of the corresponding eccentric driven shaft cold water pipeline, so as to generate an optimized structure of the eccentric driven shaft cold water pipeline.

[0138] In the embodiments of the present invention, by according to the previously obtained distribution laws of flow velocity, pressure and convective heat transfer coefficient, the optimization objectives are clarified, and then the structural design of the cold water pipeline is optimized. First, based on the uniform distribution of fluid velocity, the significant pressure drop of pressure, and the uniform distribution of heat transfer coefficient, it is clarified that the objective of the optimization design is to improve the uniformity of fluid flow, reduce flow dead zones and local pressure losses, and enhance the convective heat transfer effect. Then, using the above distribution laws as the design basis, the geometric structure of the eccentric driven shaft cold water pipeline is optimized, considering factors such as the directionality of fluid flow, the curvature of the pipeline, diameter changes, and the pipe wall material, and the pipeline structure is adjusted through numerical optimization methods (such as parametric modeling, optimization algorithms, etc.) to improve the flow efficiency and heat transfer efficiency of the fluid, thereby generating the optimized structure of the eccentric driven shaft cold water pipeline. The optimized design of this structure can ensure the uniformity of fluid velocity and heat transfer coefficient, while reducing the pressure loss in the pipeline, thereby effectively improving the overall performance of the cold water pipeline, and finally generating the optimized structure of the eccentric driven shaft cold water pipeline.

Claims

1. A method for constructing a three-dimensional model of a cold water pipeline structure of an eccentric driven shaft, characterized in that, Including the following steps: Step S1: Obtain the assembly drawing of the N-type eccentric driven shaft cold water pipe structure, and conduct geometric analysis on the components of the assembly drawing of the N-type eccentric driven shaft cold water pipe structure to obtain the corresponding structural geometric parameter sets for each eccentric driven shaft component, where the structural geometric parameter sets include structural geometric dimension parameters, structural geometric shape parameters, and the position of the structural eccentric shaft; based on the corresponding structural geometric parameter sets for each eccentric driven shaft component, use the 3D modeling software SOLIDWORKS to perform 3D geometric construction on the assembly drawing of the N-type eccentric driven shaft cold water pipe structure to generate the geometric model of the N-type eccentric driven shaft cold water pipe; Step S2: Import the geometric model of the N-type eccentric driven shaft cold water pipe into the fluid flow simulation module corresponding to the fluid dynamics precise calculation software ANSYS FLUENT to determine that the fluid domain corresponding to the structure of the eccentric driven shaft cold water pipe is the standard turbulence model and calculate the fluid Reynolds number to obtain the Reynolds number; by setting the inlet and outlet boundary conditions of the cold water pipe and the heat transfer coefficient, thermal radiation coefficient, and heat source thermal conditions between the end faces of the components corresponding to the eccentric driven shaft and the air and the environment, and performing a thermal coupling simulation modeling on the geometric model of the N-type eccentric driven shaft cold water pipe to generate a thermal-fluid coupling simulation calculation model of the eccentric driven shaft; Step S2 includes the following steps: Step S21: 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 precise calculation software ANSYS FLUENT, and set the fluid domain corresponding to the structure of the eccentric driven shaft cold water pipeline in the N-type eccentric driven shaft cold water pipeline geometric model as the standard turbulence model; Step S22: Calculate the fluid Reynolds number for the standard turbulence model to obtain the Reynolds number , where is the fluid flow rate corresponding to the standard turbulence model, is the coefficient of the cold water pipe wall corresponding to the standard turbulence model, is the kinematic viscosity of the fluid corresponding to the standard turbulence model; Step S23: Obtain the hydrodynamic characteristics of the cold water pipeline through the standard turbulence model corresponding to the geometric model of the N-type eccentric driven shaft cold water pipeline, and set the inlet and outlet boundary conditions for the geometric model of the N-type eccentric driven shaft cold water pipeline based on the hydrodynamic characteristics of the cold water pipeline, so as to set 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: Configure the heat transfer model between air convection and environmental thermal radiation through the fluid dynamics precise calculation software ANSYS FLUENT, and based on the heat transfer model between air convection and environmental thermal radiation, set the thermal condition mapping for the corresponding eccentric driven shaft components within the geometric model of the N-type eccentric driven shaft cold water pipe to obtain the heat transfer coefficient, thermal radiation coefficient, and heat source thermal conditions between the end faces of the corresponding eccentric driven shaft components and the air and the environment; Step S25: Based on the boundary conditions of the cold water pipe inlet and outlet, heat transfer coefficient, thermal radiation coefficient, and heat source thermal conditions, perform thermal coupling simulation modeling on the geometric model of the N-type eccentric driven shaft cold water pipe to generate the eccentric driven shaft heat flow coupling simulation calculation model; Step S3: Perform cross-mesh division on the interface between the outer surface and the inner surface of the cold water pipe within the eccentric driven shaft heat flow coupling simulation calculation model, and simulate and analyze the heat exchange process between the fluid flow inside and outside the cold water pipe and the solid components within the eccentric driven shaft heat flow coupling simulation calculation model by setting the thermal physical property parameters of the cold water pipe material and the working parameters of the main motor to generate the heat exchange simulation process between the fluid domain and the solid domain inside and outside the cold water pipe; Step S4: Set the convergence criterion, initialization function, solution controller, and iterative time steps through the fluid dynamics precise calculation software ANSYS FLUENT, and use the second-order coupled implicit algorithm to perform iterative convergence solution on the heat exchange simulation process between the fluid domain and the solid domain inside and outside the cold water pipe to obtain the fluid flow distribution of the cold water pipe, the internal pressure distribution of the cold water pipe, and the heat transfer coefficient inside and outside the cold water pipe; obtain the Prandtl number and the Nusselt number, and conduct convective heat transfer derivation analysis on the heat transfer coefficient inside and outside the cold water pipe based on the Reynolds number, Prandtl number, and Nusselt number to obtain the convective heat transfer coefficient of the cold water pipe fluid; based on the fluid flow distribution of the cold water pipe, the internal pressure distribution of the cold water pipe, and the convective heat transfer coefficient of the cold water pipe fluid, use the post-processing software CFD Post to optimize the design of the corresponding eccentric driven shaft cold water pipe structure to generate the optimized structure of the eccentric driven shaft cold water pipe.

2. The method for constructing a three-dimensional model of the eccentric driven shaft cold water pipeline structure according to claim 1, characterized in that, Step S1 includes the following steps: Step S11: Obtain the assembly drawing of the N-type eccentric driven shaft cold water pipe structure; Step S12: Precisely measure the geometric dimensions of each eccentric driven shaft component in the assembly drawing of the N-type eccentric driven shaft cold water pipeline structure to obtain the corresponding structural geometric dimension parameters of each eccentric driven shaft component, including the length, width, and height of each eccentric driven shaft component; Step S13: Obtain the material physical properties of each eccentric driven shaft component, and based on the material physical properties of each eccentric driven shaft component, conduct a refined geometric shape analysis of the corresponding eccentric driven shaft component in the N-type eccentric driven shaft cold water pipeline structure assembly drawing to obtain the corresponding structural geometric shape parameters of each eccentric driven shaft component, including the shape size, shape curvature, and shape surface flatness of each eccentric driven shaft component; Step S14: Obtain the structural layout and constraint relationships between each eccentric driven shaft component within the cold water pipeline structure through the assembly drawing of the N-type eccentric driven shaft cold water pipeline structure, and based on the structural layout and constraint relationships between each eccentric driven shaft component within the cold water pipeline structure, calculate the eccentric shaft position of the corresponding eccentric driven shaft component to obtain the corresponding structural eccentric shaft position of each eccentric driven shaft component; Step S15: Based on the corresponding structural geometric dimension parameters, structural geometric shape parameters, and structural eccentric shaft positions of each eccentric driven shaft component, use the 3D modeling software SOLIDWORKS to perform 3D geometric construction on the assembly drawing of the N-type eccentric driven shaft cold water pipeline structure to generate the N-type eccentric driven shaft cold water pipeline geometric model.

3. The method for constructing a three-dimensional model of the eccentric driven shaft cold water pipe structure according to claim 2, wherein The calculation of the eccentric shaft position in Step S14 is quantitatively calculated through the structural eccentric shaft position calculation formula. Among them, the specific structural eccentric shaft position calculation formula is: ； In the formula, is the structural eccentric shaft position corresponding to the th eccentric driven shaft component, is the total number of eccentric driven shaft components, is the total mass of the cold water pipeline structure of the eccentric driven shaft, is the length of the cold water pipeline, is the position variable parameter of the eccentric driven shaft, is the th eccentric driven shaft component at the position corresponding structural acting force, is the th eccentric driven shaft component at the position corresponding radial distance of the eccentric shaft, is the th eccentric driven shaft component at the position corresponding rotation angle of the eccentric shaft, is the total number of constraints between each eccentric driven shaft component, is the th stiffness coefficient corresponding to the th constraint between each eccentric driven shaft component, is the th constraint between each eccentric driven shaft component at the position corresponding structural deformation, is the exponential function, is the correction coefficient of the structural eccentric shaft position.

4. The method for constructing a three-dimensional model of the eccentric driven shaft cold water pipeline structure according to claim 1, characterized in that, Step S3 includes the following steps: Step S31: Establish an interface between the outer surface and the inner surface of the cold water pipeline within the eccentric driven shaft thermal-fluid coupling simulation calculation model through the fluid dynamics precise calculation software ANSYS FLUENT to generate a bound interface between the internal and external fluid domains and the solid domain of the cold water pipeline; Step S32: Based on the bound interface between the internal and external fluid domains and the solid domain of the cold water pipeline, use the fluid dynamics precise calculation software ANSYS FLUENT to set the corresponding average overall mesh division quality value to perform cross-mesh division between the outer surface and the inner surface of the cold water pipeline within the eccentric driven shaft thermal-fluid coupling simulation calculation model to generate an eccentric driven shaft thermal-fluid coupling fluid-solid cross-mesh model; Step S33: Obtain the working environment and actual working conditions of the cold water pipeline, and based on the working environment and actual working conditions of the cold water pipeline, precisely set the thermal physical property parameters of the material used for the cold water pipeline within the eccentric driven shaft thermal-fluid coupling fluid-solid cross-mesh model to obtain the cold water pipeline material thermal physical property parameters, including density, specific heat capacity, thermal conductivity, and viscosity; Step S34: Obtain the main motor working parameters corresponding to the cold water pipeline, including the main motor working temperature, main motor power output, and main motor thermal load; Step S35: Based on the thermal physical property parameters of the cold water pipe material and the operating parameters of the main motor, use the fluid dynamics precise calculation software ANSYS FLUENT to conduct a thermal exchange condition simulation analysis on the heat exchange process between the internal and external fluids of the cold water pipe and the heat transfer between the solid components in the eccentric driven shaft thermal-fluid coupling fluid-solid cross-grid model, so as to generate the thermal exchange simulation process between the internal and external fluid domains and the solid domain of the cold water pipe.

5. The method for constructing a three-dimensional model of the eccentric driven shaft cold water pipeline structure according to claim 4, characterized in that, The specific average value of the overall grid division quality described in Step S32 is 0.

82.

6. The method for constructing a three-dimensional model of the eccentric driven shaft cold water pipeline structure according to claim 1, characterized in that, Step S4 includes the following steps: Step S41: Use the fluid dynamics precise calculation software ANSYS FLUENT to set the convergence criterion, initialization function, solution controller, and iterative time steps for the thermal exchange simulation process between the internal and external fluid domains and the solid domain of the cold water pipe; Step S42: Based on the convergence criterion, initialization function, solution controller, and iterative time steps, and use the second-order coupled implicit algorithm to perform thermal exchange iterative convergence solution on the thermal exchange simulation process between the internal and external fluid domains and the solid domain of the cold water pipe, so as to obtain the cold water pipe fluid flow distribution, the internal pressure distribution of the cold water pipe, and the heat transfer coefficient between the inside and outside of the cold water pipe; Step S43: Obtain the Prandtl number and the Nusselt number; Step S44: Conduct convective heat transfer derivation and analysis on the internal and external heat transfer coefficients of the cold water pipe based on the Reynolds number, Prandtl number, and Nusselt number to obtain the convective heat transfer coefficient of the cold water pipe fluid , , where is the Nusselt number, is the fluid thermal conductivity, is the inner diameter of the cold water pipe, is the internal and external heat transfer coefficient of the cold water pipe, is the Reynolds number, is the empirical constant of the cold water pipe flow state, is the Prandtl number, is the empirical constant of the internal and external heat transfer surface shape of the cold water pipe; Step S45: Based on the cold water pipe fluid flow distribution, the internal pressure distribution of the cold water pipe, and the convective heat transfer coefficient of the cold water pipe fluid, use the post-processing software CFD Post to optimize the design of the corresponding eccentric driven shaft cold water pipe structure, so as to generate the optimized structure of the eccentric driven shaft cold water pipe.

7. The method for constructing a three-dimensional model of the eccentric driven shaft cold water pipeline structure according to claim 6, characterized in that, The iterative time steps described in step S41 Specifically, the calculation results of the heat exchange iterative convergence are saved every 10 steps, and a total of 1000 iterations are performed.

8. The method for constructing a three-dimensional model of the eccentric driven shaft cold water pipeline structure according to claim 7, characterized in that The specific second-order coupled implicit algorithm in Step S42 is: ； ； ； ； ； ； ； Wherein, is the fluid velocity vector distribution of the cold water pipe, is the fluid density of the cold water pipe, is the instantaneous time of the fluid in the cold water pipe, is the Laplace operator, is the internal pressure distribution of the cold water pipe, is the dynamic viscosity of the fluid in the cold water pipe, is the external force of the cold water pipe, is at time the internal and external heat exchange force term of the cold water pipe, is the fluid temperature of the cold water pipe, is the thermal conductivity of the fluid in the cold water pipe, is at time the internal heat source in the fluid domain of the cold water pipe, 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 thermal conductivity of the solid of the cold water pipe, is the heat exchange coefficient between the solid and the fluid of the cold water pipe, is at time the internal heat source of the solid of the cold water pipe, is the cold water pipe fluid flow distribution corresponding to the th iteration time step, is the cold water pipe fluid flow distribution corresponding to the th iteration time step, is the iteration time step, is the implicit update term of hydrodynamics, is the cold water pipe fluid temperature distribution corresponding to the th iteration time step, is the cold water pipe fluid temperature distribution corresponding to the th iteration time step, is the implicit update term of 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 internal and external heat transfer coefficient of the cold water pipe.

9. The method for constructing a three-dimensional model of the eccentric driven shaft cold water pipeline structure according to claim 6, wherein, Step S45 includes the following steps: Step S451: Use the post-processing software CFD Post to draw the fluid flow vector distribution of the cold water pipe fluid flow distribution, so as to generate the internal fluid velocity vector distribution cloud map of the cold water pipe; Step S452: Use the post-processing software CFD Post to draw the pressure distribution of the internal pressure distribution of the cold water pipe, so as to generate the internal pressure distribution cloud map of the cold water pipe; Step S453: Use the post-processing software CFD Post to draw the convective heat transfer coefficient distribution of the cold water pipe fluid convective heat transfer coefficient, so as to generate the convective heat transfer coefficient distribution map of the cold water pipe; Step S454: Conduct distribution law identification and analysis on the internal fluid velocity vector distribution cloud map of the cold water pipe, the internal 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 laws corresponding to the cold water pipe fluid velocity, the internal pipe pressure, 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 convective coefficient distribution of the cold water pipe, and based on the distribution laws corresponding to the cold water pipe fluid velocity, the internal pipe pressure, and the convective heat transfer coefficient, use the structural design optimization objectives to optimize the design of the corresponding eccentric driven shaft cold water pipe structure, so as to generate the optimized structure of the eccentric driven shaft cold water pipe.

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