Thermodynamic coupling topology optimization design method and system for valve seat structure of gas cylinder

Abstract

The application discloses a kind of thermodynamic coupling topological optimization design method and system of gas cylinder valve seat structure, and the method comprises: creating gas cylinder model, including inner container structure and valve seat structure, and the valve seat structure is solid structure;Temperature field distribution is calculated based on heat conduction analysis;Based on stress-strain analysis, the temperature field distribution is used as pre-defined field, and simulation result is obtained;Based on topological optimization method, the valve seat structure is optimized to a solid of revolution with hole structure.The method provided by the application fully considers the temperature change of the valve seat in the full gas process in actual application, and performs thermodynamic coupling topological optimization.By changing different parameter settings, based on actual temperature field, stress condition and stress-strain field, a valve seat structure suitable for actual production is obtained, which has strong applicability, solves the problems of cost and condition limitation in the experimental process during the design stage, and is a new idea for optimizing the design of the structure, which has important significance for promoting the production of hydrogen storage gas cylinder.

Description

Technical Field

[0001] This invention relates to the field of industrial design technology, and in particular to a thermo-coupling topology optimization design method and system for a gas cylinder valve seat structure. Background Technology

[0002] Hydrogen energy is an abundant, green, low-carbon, and widely applicable secondary energy source, and is gradually becoming one of the important carriers for global energy transition. Hydrogen storage and transportation technology is one of the main obstacles restricting the development of hydrogen energy. The main methods of hydrogen storage include high-pressure gaseous hydrogen storage, cryogenic liquid hydrogen storage, organic liquid hydrogen storage, and solid-state hydrogen storage. High-pressure gaseous hydrogen storage has the characteristics of low cost, low energy consumption, and fast refill and discharge speed, and is mainly divided into three types: vehicle-mounted hydrogen storage tanks, transport hydrogen storage tanks, and stationary hydrogen storage equipment.

[0003] With the development of hydrogen fuel cell vehicles, vehicle-mounted hydrogen storage tanks have become the primary method, among which the 70MPa carbon fiber wound Type IV hydrogen storage cylinder is currently the mainstream international technology. Since the valve seat of the Type IV hydrogen storage cylinder is made of metal, its structural design has become an important research direction. Currently, the valve seat structure has not been optimized, resulting in low material utilization and low weight reduction.

[0004] Topology optimization, a type of structural optimization, is a conceptual design phase in product design. It can break through the limitations of traditional design and create new configurations. It is the most challenging, dynamic, and vital research direction in structural optimization. Based on engineering realities, within a given design domain and under specified loads and constraints, topology optimization seeks the optimal material distribution to reduce weight, displacement, or stress levels, thereby improving material utilization and ultimately achieving lightweight design and cost reduction.

[0005] In recent years, topology optimization methods have been widely used in the automotive, aerospace, shipbuilding, and machinery industries. Several commercial finite element method (FEM) software programs, such as TOSCA, ABAQUS, HyperWorks, and ANSYS, have incorporated topology optimization capabilities. Among these commercial FEM software programs, ABAQUS is widely considered the most powerful, capable of analyzing complex solid mechanical structures and systems, particularly handling very large and complex problems and simulating highly nonlinear problems.

[0006] Hydrogen storage cylinders experience drastic temperature changes during filling and discharging. Currently, there is no valve seat design that takes temperature into account, and the valve seat design results obtained from this cannot accurately fit the specific application scenarios of the valve seat. Summary of the Invention

[0007] To address the shortcomings of existing technologies, the present invention aims to provide a thermo-coupling topology optimization design method and system for gas cylinder valve seat structures.

[0008] To achieve the aforementioned objectives, the technical solution adopted by this invention includes:

[0009] In a first aspect, the present invention provides a thermo-coupling topology optimization design method for a gas cylinder valve seat structure, comprising:

[0010] Create a gas cylinder model, which includes a matching inner liner structure and a valve seat structure, wherein the valve seat structure is a solid structure;

[0011] Based on thermal conduction analysis, the current thermal load and thermal boundary conditions are set, and the temperature field distribution of the inner liner structure and valve seat structure is calculated based on the thermal load and thermal boundary conditions.

[0012] Based on stress-strain analysis, the current mechanical load and mechanical boundary conditions are set, and based on the mechanical load and mechanical boundary conditions, with the temperature field distribution as a predefined field, at least the simulation results of the valve seat structure are obtained;

[0013] Based on the topology optimization method, and combined with the strain energy and volume change of the valve seat structure, the valve seat structure in the simulation results is optimized. The optimized valve seat structure is a rotating body structure with a hole structure.

[0014] Secondly, the present invention also provides a thermo-coupling topology optimization design system for a gas cylinder valve seat structure, comprising:

[0015] The gas cylinder model module is used to create a gas cylinder model, which includes a matching inner liner structure and a valve seat structure, wherein the valve seat structure is a solid structure.

[0016] The thermal analysis module is used to set the current thermal load and thermal boundary conditions based on heat conduction analysis, and to calculate the temperature field distribution of the inner liner structure and the valve seat structure based on the thermal load and thermal boundary conditions.

[0017] The mechanical analysis module is used to set the current mechanical load and mechanical boundary conditions based on stress-strain analysis, and based on the mechanical load and mechanical boundary conditions, with the temperature field distribution as a predefined field, to obtain at least the simulation results of the valve seat structure.

[0018] The topology optimization module is used to optimize the valve seat structure in the simulation results based on the topology optimization method and in combination with the strain energy and volume change of the valve seat structure. The optimized valve seat structure is a rotating body structure with a hole structure.

[0019] Based on the above technical solution, compared with the prior art, the beneficial effects of the present invention include at least the following:

[0020] This invention provides a thermo-coupled topology optimization design method that fully considers the temperature change of the valve seat during the full gasification process in actual applications. By changing different parameter settings, based on the actual temperature field, stress conditions, and stress-strain field, a valve seat structure suitable for actual production is obtained. This method has strong applicability and solves the problems of cost and condition limitations in the experimental process during the design stage. It is a new idea for optimizing the design of this structure and is of great significance for promoting the finalization of hydrogen storage cylinder production.

[0021] The above description is merely an overview of the technical solution of the present invention. In order to enable those skilled in the art to better understand the technical means of this application and to implement it in accordance with the contents of the specification, the preferred embodiments of the present invention are described below in conjunction with detailed drawings. Attached Figure Description

[0022] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0023] Figure 1 This is a schematic diagram of the process of a thermo-coupled topology optimization design method provided in a typical embodiment of the present invention;

[0024] Figure 2 This is a schematic diagram of the initial gas cylinder model provided in a typical embodiment of the present invention;

[0025] Figure 3 This is a schematic diagram of the optimized gas cylinder model provided in a typical embodiment of the present invention.

[0026] Explanation of reference numerals in the attached drawings: 1. Valve seat structure; 2. Inner liner structure; 3. First radial boss; 4. Second radial boss; 5. Radial groove; 6. Axial groove; 7. Axial boss; 8. First hole structure; 9. Second hole structure; 10. Third hole structure; 11. Fourth hole structure; 12. Fifth hole structure. Detailed Implementation

[0027] In view of the shortcomings of the prior art, the inventors of this invention, through long-term research and extensive practice, have proposed the technical solution of this invention, which takes into account the influence of temperature changes on the valve seat and is crucial to promoting the development of hydrogen storage technology. The following will further explain the technical solution, its implementation process, and its principles.

[0028] Many specific details are set forth in the following description in order to provide a full understanding of the invention. However, the invention may also be practiced in other ways different from those described herein, and therefore the scope of protection of the invention is not limited to the specific embodiments disclosed below.

[0029] Moreover, relational terms such as “first” and “second” are used merely to distinguish one component or method step from another that has the same name, and do not necessarily require or imply any such actual relationship or order between these components or method steps.

[0030] See Figures 1-3 One aspect of the present invention provides a thermo-coupling topology optimization design method for a gas cylinder valve seat structure 1, comprising the following steps:

[0031] Create a gas cylinder model, which includes an inner liner structure 2 and a valve seat structure 1 that are fitted together, wherein the valve seat structure 1 is a solid structure.

[0032] Based on thermal conduction analysis, the current thermal load and thermal boundary conditions are set, and the temperature field distribution of the inner liner structure 2 and the valve seat structure 1 is calculated based on the thermal load and thermal boundary conditions.

[0033] Based on stress-strain analysis, the current mechanical load and mechanical boundary conditions are set, and based on the mechanical load and mechanical boundary conditions, with the temperature field distribution as a predefined field, at least the simulation results of the valve seat structure 1 are obtained.

[0034] Based on the topology optimization method, and combined with the strain energy and volume change of the valve seat structure 1, the valve seat structure 1 in the simulation results is optimized so that at least a hole structure appears in the valve seat structure 1.

[0035] As examples, this invention preferably uses ABAQUS finite element software combined with user subroutines for secondary development to perform thermo-coupling topology optimization on the valve seat. By writing user subroutines for secondary development and using ABAQUS software to perform thermo-coupling topology optimization on the valve seat structure, the problem of low material utilization, high design cost and low design efficiency of the valve seat can be solved.

[0036] It should be noted that, based on the thermal coupling topology optimization design method provided by this invention and the corresponding programming knowledge of those skilled in the art, the above-mentioned secondary development computer program can be adapted to be written according to the instructions of the above optimization design method. Therefore, the essential focus of the technical solution provided by this invention lies in the steps of the above method, rather than in the specific program being written.

[0037] In a very specific application example, a portion of the subroutine is shown in the following code snippet:

[0038]

[0039]

[0040] For the sake of brevity, the embodiments of the present invention do not fully demonstrate all code details. Since those skilled in the art can adapt and write corresponding code to implement the above functions and processes based on the specific ideas exemplified in the present invention, the code examples here are not the only specific implementation methods.

[0041] In a more specific example, as a concrete implementation case of the above technical solution, an embodiment of the present invention provides a thermo-coupling topology optimization method for a type IV hydrogen storage cylinder valve seat. The method includes the following steps: model establishment; heat conduction analysis; stress-strain analysis; and topology optimization.

[0042] Of course, the optimized design method provided by this invention is very suitable for the design of valve seats for Type IV hydrogen storage cylinders. This is because the structure and usage scenarios of this type of cylinder determine that it will face severe temperature changes during use. This invention is an optimized design method that fully considers the above situation. However, this does not mean that the technical solution of this invention can only be applied to Type IV hydrogen storage cylinders. Other similar storage cylinders can still be simulated using the technical solution provided by this invention.

[0043] See also Figure 2 and Figure 3 Regarding the gas cylinder model created by the present invention, in some embodiments, the inner liner structure 2 and the valve seat structure 1 are rotating structures, and the inner liner structure 2 and the valve seat structure 1 are coaxially arranged.

[0044] More specifically, in some embodiments, the valve seat structure 1 includes an integrally formed first part and a second part, the first part protruding from the inner liner structure 2, and the second part being surrounded and covered by the inner liner structure 2.

[0045] In some embodiments, the second part includes a plurality of annular protrusions and recesses, which are alternately arranged.

[0046] In some embodiments, the protrusion and the recess include a first radial boss 3, a radial groove 5 and a second radial boss 4 arranged sequentially away from the first portion, the first radial boss 3, the radial groove 5 and the second radial boss 4 being disposed on the rotational surface of the second portion.

[0047] In some embodiments, the protrusion and the recess further include an axial boss 7 and an axial groove 6 arranged sequentially along an axis away from the valve seat structure 1, the axial boss 7 and the axial groove 6 being disposed on an end face of the second part facing away from the first part.

[0048] As some typical application examples of the above technical solutions, please refer to [link / reference]. Figure 2 and Figure 3 The gas cylinder model includes a valve seat structure 1 and an inner liner structure 2. A portion of the valve seat structure 1 is enclosed within the inner liner structure 2. The inner liner structure 2 is a rotating body structure that includes a portion of the valve seat, with its inner surface fitting snugly against the valve seat. There is no gap between the two structures. The valve seat is a rotating body structure (some prior art may also refer to it as a "rotating body structure"). Its outer surface is provided with a first radial boss, a second radial boss, a trapezoidal radial groove 5, a trapezoidal axial groove 6, and an axial boss 7.

[0049] The purpose of setting certain bosses and grooves is to increase the contact area between the valve seat and the inner liner during actual use, so as to better transmit torque and prevent air leakage.

[0050] The ultimate goal of this invention is to rationally implement a multi-hole structure design in the valve seat, thereby achieving lightweighting and a comprehensive improvement in thermal and mechanical properties. Regarding the hole structure, the design concepts of some preferred embodiments of this invention are as follows:

[0051] See Figure 3 In some implementations, the hole structure is an annular hole coaxially arranged with the valve seat structure 1.

[0052] In some embodiments, the hole structure includes closed holes disposed inside the valve seat structure 1 and / or open holes disposed on the surface of the valve seat structure 1.

[0053] In some implementations, the open hole is located circumferentially in the valve seat structure 1.

[0054] In some implementations, the open hole is an extension of the radial groove 5.

[0055] As a specific implementation example, the technical method provided by the present invention described above is used, such as... Figure 3As shown, in one of the optimized structures, the optimized valve seat structure 1 changes: the optimized valve seat structure 1 still has a rotating body structure, which includes optimized first hole structure 8, optimized second hole structure 9, optimized third hole structure 10, optimized fourth hole structure 11, and optimized fifth hole structure 12, which are also rotating bodies. The fifth hole structure 12 is an open hole, whose opening is located at the bottom of the trapezoidal radial groove 5 and is recessed towards the axis.

[0056] In some implementation schemes, creating the gas cylinder model specifically includes:

[0057] Create a three-dimensional deformable and rotatable solid valve seat structure 1 and an inner liner structure 2 respectively.

[0058] Based on the rules governing the variation of the thermal material parameters of the valve seat, cross-sectional properties are created, and specific cross-sectional structures are assigned to the valve seat structure 1 and the inner liner structure 2, respectively.

[0059] The valve seat structure 1 and the inner liner structure 2 are assembled to obtain the gas cylinder model.

[0060] In some implementations, the heat conduction analysis specifically includes:

[0061] The valve seat structure 1 and the inner liner structure 2 are respectively divided into meshes.

[0062] A surface-to-surface binding constraint is set on the surface where the valve seat structure 1 and the inner liner structure 2 contact; the applied thermal load and thermal boundary conditions are defined.

[0063] Using a static general implicit solver, the temperature field distribution of the valve seat structure 1 and the inner liner structure 2 under the current thermal load and thermal boundary conditions is calculated.

[0064] In some implementations, the stress-strain analysis specifically includes:

[0065] Define the material properties of the valve seat structure 1 and the inner liner structure 2 respectively.

[0066] The valve seat structure 1 and the inner liner structure 2 are divided into meshes.

[0067] Define the load and boundary conditions, and select the temperature field distribution as the predefined field. The load includes the pressure borne by the inner surface of the inner liner structure 2, and the boundary conditions include setting the cross-sectional symmetry constraint of the inner liner structure 2.

[0068] The simulation results of the gas cylinder model without topology optimization were obtained using a static general implicit solver.

[0069] In some implementations, the material properties include the elastic modulus and Poisson's ratio of the materials corresponding to the valve seat structure 1 and the inner liner structure 2.

[0070] In some implementations, the topology optimization method specifically includes:

[0071] Select a portion of the valve seat structure 1 that is in contact with the inner liner structure 2 as the optimization target area, and freeze the load and boundary condition area.

[0072] Create the strain energy design response and the volume design response separately. The objective function is selected as the minimum design response value of strain energy, and the design response is selected as the volume design response.

[0073] Set the maximum number of iterations, submit the optimization job, and extract the structure of the optimized gas cylinder model.

[0074] In some implementations, the optimization design method further includes modifying parameter settings and recalculating the topology optimization design until a gas cylinder model structure that meets the design requirements is obtained.

[0075] In some implementations, the response constraint volume of the volume design is ≤95%.

[0076] As some typical application examples of the above technical solutions, the thermo-coupling topology optimization design method provided by the present invention can be implemented according to the following steps:

[0077] S1: Thermal conduction analysis.

[0078] S2: Stress-strain analysis.

[0079] S3: Topology optimization.

[0080] More specifically, in step S1, the heat conduction analysis can be performed as follows:

[0081] S1.1 Create geometric components: Create geometric models of the three-dimensional deformable rotatable solid valve seat structure 1 and inner liner structure 2 respectively.

[0082] S1.2 Define material properties: Based on the rules of the change of thermal material parameters of the valve seat, use FORTRAN language to write UMATHT subroutine for secondary development, and create cross-sectional properties, which are respectively assigned to the valve seat structure 1 and the inner liner structure 2.

[0083] S1.3 Assemble the components: Select two three-dimensional geometric models respectively, and assemble them according to the actual assembly logic.

[0084] S1.4 Meshing: Mesh the valve seat and inner liner separately. To facilitate mesh generation, the 3D geometric model needs to be appropriately segmented. For example, DC3D8 eight-node linear heat transfer hexahedral elements can be used for mesh generation, with the mesh size determined based on the computer's performance. Finally, check the mesh quality and perform mesh sensitivity analysis.

[0085] S1.5 Set up the analysis step: Select the Heat transfer analysis step and set the temperature field output.

[0086] S1.6 defines the interaction: the surfaces of the valve seat structure 1 and the inner liner structure 2 that come into contact are subject to surface-to-surface binding constraints.

[0087] S1.7 Define loads and boundary conditions: Apply thermal loads and boundary conditions.

[0088] S1.8 Set the solver: Select the static general implicit solver, select the written UMATHT subroutine in the job module, submit the job, and obtain the temperature field of the above combined structure under the current thermal load and boundary conditions.

[0089] In step S2, the stress-strain analysis can be performed as follows:

[0090] S2.1 Define material properties: Use FORTRAN to write UMAT subroutines for secondary development and create cross-sectional properties, assigning them to the valve seat and inner liner structure 2 respectively. In a specific implementation case, for example, the valve seat material can be set as follows: aluminum alloy with an elastic modulus of 68.9 GPa and a Poisson's ratio of 0.33; the inner liner material can be high-density polyethylene with an elastic modulus of 0.9 GPa and a Poisson's ratio of 0.38.

[0091] S2.2 Meshing: The mesh is generated using C3D8R eight-node hexahedral linear reduced integral elements with enhanced hourglass control, and an appropriate mesh size is used.

[0092] S2.3 Setting the Analysis Step: Select Static, then General, and set the output.

[0093] S2.4 Define loads and boundary conditions: Apply a pressure of 0.5 MPa to the inner surface of the assembly, set symmetrical constraint boundary conditions for the inner liner section, and select the temperature field obtained in step S1 as the predefined field.

[0094] S2.5 Solver Setup: Select the static general implicit solver, select the written UMAT subroutine in the job module, submit the job, and obtain the simulation results of the structure using UMAT secondary development without topology optimization.

[0095] In step S3, topology optimization can be performed as follows:

[0096] S3.1 Define the optimization task: Select topology optimization as the optimization type, select the valve seat area in contact with the inner liner as the optimization target area, and freeze the load and boundary condition areas.

[0097] S3.2 Define Design Response: Create the strain energy design response and the volumetric design response respectively.

[0098] S3.3 Define the objective function: Select the strain energy as the minimum design response value.

[0099] S3.4 Define volume constraints: Select volume design response for design response, and constrain the volume to be less than or equal to 95%.

[0100] S3.5 Submit Optimization Analysis: Set the maximum number of loops to 50 and submit the optimization job.

[0101] S3.6 View Optimization Results: View the result cloud map in the optimization process management and extract the optimized model. Determine the correctness of the simulation results and the rationality of the topology optimization. Continuously modify the parameter settings and re-perform the simulation optimization calculation.

[0102] Using the specific process described above, in step S3.6, the optimization results are checked, and the optimized valve seat structure 1 has changed. The optimized valve seat has a rotating body structure, and its cross-section is as follows... Figure 3 As shown, the rotating body includes a first hole structure 8, a second hole structure 9, a third hole structure 10, a fourth hole structure 11, and a fifth hole structure 12.

[0103] In the above implementation examples, the method provided by this invention was used to optimize a gas cylinder valve seat model with multiple perforated structures. The number, size, and location of these perforated structures significantly improve the overall lightweighting and mechanical and thermal performance of the structure. Calculations and tests showed that the optimized valve seat structure 1 was 22.2% lighter than the unoptimized version. However, without considering temperature changes, the weight reduction was only 10.5%.

[0104] This shows that the technical solution provided by the present invention fully considers the temperature changes during the inflation and deflation process, and thus can better fit the actual use scenario of valve seat structure 1. Compared with the static single design concept, the designed valve seat has higher performance.

[0105] For the topology optimization design method described above, please refer to [link / reference]. Figure 1 Another aspect of this invention provides a thermo-coupled topology optimization design system for a gas cylinder valve seat structure 1, comprising:

[0106] The gas cylinder model module is used to create a gas cylinder model, which includes an inner liner structure 2 and a valve seat structure 1 that are fitted together. The valve seat structure 1 is a solid structure.

[0107] The thermal analysis module is used to set the current thermal load and thermal boundary conditions based on thermal conduction analysis, and to calculate the temperature field distribution of the inner liner structure 2 and the valve seat structure 1 based on the thermal load and thermal boundary conditions.

[0108] The mechanical analysis module is used to set the current mechanical load and mechanical boundary conditions based on stress-strain analysis, and based on the mechanical load and mechanical boundary conditions, with the temperature field distribution as a predefined field, to obtain at least the simulation results of the valve seat structure 1.

[0109] The topology optimization module is used to optimize the valve seat structure 1 in the simulation results based on the topology optimization method and in combination with the strain energy and volume change of the valve seat structure 1, so as to at least make the valve seat structure 1 have a hole structure.

[0110] Accordingly, embodiments of the present invention also provide a readable storage medium storing a computer program, wherein the computer program, when run by a processor, executes the steps of the above-described thermo-coupled topology optimization design method for the gas cylinder valve seat structure 1, or the readable storage medium stores the above-described thermo-coupled topology optimization design system for the gas cylinder valve seat structure 1.

[0111] Based on the above embodiments, it is clear that the technical solution provided by the present invention fully considers the temperature change of the valve seat during the full gasification process in actual applications, performs thermo-coupling topology optimization, and obtains a valve seat structure 1 suitable for actual production by changing different parameter settings based on the actual temperature field, force conditions and stress-strain field. This method has strong applicability and solves the problems of cost and condition limitations in the experimental process during the design stage. It is a new idea for optimizing the design of this structure and is of great significance for promoting the production and finalization of Type IV hydrogen storage cylinders.

[0112] It should be understood that the above embodiments are merely illustrative of the technical concept and features of the present invention, and are intended to enable those skilled in the art to understand the content of the present invention and implement it accordingly. They should not be construed as limiting the scope of protection of the present invention. All equivalent changes or modifications made in accordance with the spirit and essence of the present invention should be covered within the scope of protection of the present invention.

Claims

1. A thermo-coupling topology optimization design method for a gas cylinder valve seat structure, characterized in that, include: A gas cylinder model is created, comprising a liner structure and a valve seat structure that are fitted together. The valve seat structure is a solid structure. The liner structure and the valve seat structure are coaxially arranged. The valve seat structure comprises an integrally formed first part and a second part. The first part protrudes from the liner structure, and the second part is surrounded and covered by the liner structure. The second part includes multiple annular protrusions and recesses, which are alternately arranged. The protrusions and recesses include a first radial boss, a radial groove, and a second radial boss arranged sequentially away from the first part. The first radial boss, radial groove, and second radial boss are disposed on the rotational surface of the second part. The protrusions and recesses also include an axial boss and an axial groove arranged sequentially along an axis away from the valve seat structure. The axial boss and axial groove are disposed on an end face of the second part facing away from the first part. Based on thermal conduction analysis, the current thermal load and thermal boundary conditions are set, and the temperature field distribution of the inner liner structure and valve seat structure is calculated based on the thermal load and thermal boundary conditions. Based on stress-strain analysis, the current mechanical load and mechanical boundary conditions are set, and based on the mechanical load and mechanical boundary conditions, with the temperature field distribution as a predefined field, at least the simulation results of the valve seat structure are obtained; Based on the topology optimization method, and combined with the strain energy and volume change of the valve seat structure, the valve seat structure in the simulation results is optimized. The optimized target valve seat structure is a rotating body structure with a hole structure. The hole structure is an annular hole coaxially arranged with the valve seat structure. The hole structure includes a closed hole disposed inside the valve seat structure and / or an open hole disposed on the surface of the valve seat structure. The open hole is disposed in the circumferential direction of the valve seat structure and is an extension of the radial groove.

2. The thermo-coupled topology optimization design method according to claim 1, characterized in that, The creation of the gas cylinder model specifically includes: Create a three-dimensional deformable and rotatable solid valve seat structure and inner liner structure respectively; Based on the rules governing the variation of the thermal material parameters of the valve seat, cross-sectional properties are created, and specific cross-sectional structures are assigned to the valve seat structure and the inner liner structure respectively. The valve seat structure and the inner liner structure are assembled to obtain the gas cylinder model.

3. The thermo-coupling topology optimization design method according to claim 2, characterized in that, The heat conduction analysis specifically includes: The valve seat structure and the inner liner structure are respectively divided into meshes; A surface-to-surface binding constraint is set on the surface where the valve seat structure and the inner liner structure contact; the applied thermal load and thermal boundary conditions are defined; Using a static general implicit solver, the temperature field distribution of the valve seat structure and inner liner structure under the current thermal load and thermal boundary conditions is calculated.

4. The thermo-coupling topology optimization design method according to claim 2, characterized in that, The stress-strain analysis specifically includes: Define the material properties of the valve seat structure and the inner liner structure respectively; The valve seat structure and inner liner structure are divided into grids; Define loads and boundary conditions, and select the temperature field distribution as a predefined field. The loads include the pressure borne by the inner surface of the inner liner structure, and the boundary conditions include setting symmetrical constraints on the cross-section of the inner liner structure. The simulation results of the gas cylinder model without topology optimization were obtained using a static general implicit solver.

5. The thermo-coupling topology optimization design method according to claim 4, characterized in that, The material properties include the elastic modulus and Poisson's ratio of the materials corresponding to the valve seat structure and the inner liner structure.

6. The thermo-coupling topology optimization design method according to claim 2, characterized in that, The topology optimization method specifically includes: Select a portion of the valve seat structure that is in contact with the inner liner structure as the optimization target area, and freeze the load and boundary condition area. Create strain energy design response and volume design response respectively. Select strain energy as the minimum design response value as the objective function and select volume design response as the design response. Set the maximum number of iterations, submit the optimization job, and extract the structure of the optimized gas cylinder model.

7. The thermo-coupling topology optimization design method according to claim 6, characterized in that, It also includes modifying parameter settings and recalculating the topology optimization design until a gas cylinder model structure that meets the design requirements is obtained, wherein the response constraint volume of the volume design is ≤95%.

8. A thermo-coupled topology optimization design system for a gas cylinder valve seat structure for implementing the thermo-coupled topology optimization design method according to any one of claims 1-7, characterized in that, include: The gas cylinder model module is used to create a gas cylinder model, which includes a matching inner liner structure and a valve seat structure, wherein the valve seat structure is a solid structure. The thermal analysis module is used to set the current thermal load and thermal boundary conditions based on heat conduction analysis, and to calculate the temperature field distribution of the inner liner structure and the valve seat structure based on the thermal load and thermal boundary conditions. The mechanical analysis module is used to set the current mechanical load and mechanical boundary conditions based on stress-strain analysis, and based on the mechanical load and mechanical boundary conditions, with the temperature field distribution as a predefined field, to obtain at least the simulation results of the valve seat structure. The topology optimization module is used to optimize the valve seat structure in the simulation results based on the topology optimization method and in combination with the strain energy and volume change of the valve seat structure. The optimized valve seat structure is a rotating body structure with a hole structure.

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