Impeller combination mandrel design method and device, storage medium and computer equipment

Abstract

This invention relates to the field of intelligent manufacturing technology for centrifugal compressors, and discloses a design method, device, storage medium, and computer equipment for an impeller assembly mandrel. The method includes acquiring a two-dimensional design drawing of the impeller and selecting a preset number of key points; calculating at least one mating dimension parameter of the impeller based on the geometric relationship between the key points; selecting multiple assembly components from a standard component database based on the mating dimension parameter, and performing simulated assembly based on preset assembly rules to generate an assembly model of the impeller assembly mandrel; calculating the rotational inertia ratio of the impeller assembly mandrel based on the assembly model; and generating engineering drawings and a parts list for the impeller assembly mandrel when the rotational inertia ratio meets preset requirements. This method improves the design efficiency and accuracy of the assembly mandrel, shortens the design cycle, ensures that the output design results meet the operational requirements of the test equipment in terms of rotational inertia characteristics, and guarantees the safety of high-speed impeller rotation tests.

Description

Technical Field

[0001] This invention relates to the field of intelligent manufacturing technology for centrifugal compressors, and in particular to a design method, device, storage medium, and computer equipment for an impeller assembly mandrel. Background Technology

[0002] The combined mandrel, a key process equipment specifically designed for balancing and over-rotation testing of centrifugal compressor impellers, aims to verify the structural integrity, dynamic performance, and process reliability of individual impellers after finishing and before main shaft assembly by performing dynamic balancing and over-rotation tests, thereby ensuring that they meet design requirements and industry standards. The structural design of the combined mandrel typically requires selecting multiple structural components such as the mandrel, expansion sleeve, gasket, pressure plate, and fasteners based on the specific dimensional parameters of the impeller under test. It also ensures that the overall rotational inertia characteristics after assembly meet the operational requirements of the testing equipment, guaranteeing the safety and accuracy of the impeller during high-speed rotation testing.

[0003] However, the current design of composite mandrels mainly relies on manual experience. Designers need to manually measure key dimensions in the impeller drawings, select various structural components based on empirical formulas or by consulting manuals, and calculate and verify the moment of inertia separately. This traditional design method has the following problems: First, impeller drawings are mostly two-dimensional engineering drawings containing a lot of redundant information, making it inefficient and prone to errors to extract key mating dimensions manually. Second, the assembly constraints between different structural components are complex, such as the conical fit between the mandrel and the expansion sleeve, the fit between the expansion sleeve and the impeller inner hole, and the conditional selection of the gasket. Manually matching and verifying each one is time-consuming. More importantly, the calculation and optimization of the moment of inertia lacks an automated closed-loop mechanism. Designers often need to repeatedly adjust the component dimensions and recalculate until the requirements are met. The whole process is highly dependent on personal experience, resulting in a long design cycle and poor consistency. Summary of the Invention

[0004] In view of this, this application provides a design method, device, storage medium and computer equipment for impeller assembly mandrels, the main purpose of which is to solve the technical problems of existing impeller assembly mandrel designs relying on personal experience, having long design cycles and poor consistency.

[0005] According to a first aspect of the present invention, a method for designing an impeller assembly mandrel is provided, comprising: Obtain a two-dimensional design drawing of the impeller, select a preset number of key points on the two-dimensional design drawing in sequence, and calculate at least one mating dimension parameter of the impeller based on the geometric relationship between the key points; Based on the mating dimension parameters, multiple assembly components are selected from the standard component database, and the multiple assembly components are simulated to assemble with the impeller based on preset assembly rules to generate an assembly model of the impeller assembly mandrel. The axial and radial moments of inertia of the impeller assembly mandrel are calculated based on the assembly model, and the ratio of moments of inertia is calculated based on the axial and radial moments of inertia. When the rotational inertia ratio meets the preset requirements, engineering drawings and a parts list of the impeller assembly mandrel are generated.

[0006] Optionally, the mating dimension parameters include the impeller mating diameter, impeller mating width, mandrel clearance distance, and minimum diameter of the pressure plate; obtaining the two-dimensional design drawing of the impeller, sequentially selecting a preset number of key points on the two-dimensional design drawing, and calculating at least one mating dimension parameter of the impeller based on the geometric relationship between the key points, includes: determining the impeller inner hole contour line, the impeller upper end face contour line, the impeller lower end face contour line, and the impeller outer contour line on the two-dimensional contour of the impeller on the two-dimensional design drawing; taking the intersection of the impeller inner hole contour line and the impeller upper end face contour line as the first key point, and the intersection of the impeller inner hole contour line and the impeller lower end face contour line as the second key point. The intersection of the upper end face contour line and the outer side contour line of the impeller is designated as the third key point; the intersection of the lower end face contour line and the outer side contour line of the impeller is designated as the fourth key point; and the intersection of the lower end face contour line and the inner hole contour line of the impeller is designated as the fifth key point. The distance between the first key point and the second key point is calculated as the impeller mating diameter; the distance between the first key point and the third key point is calculated as the impeller mating width; the horizontal distance between the first key point and the fourth key point is calculated as the mandrel clearance distance; and the distance between the third key point and the fifth key point is calculated as the minimum diameter of the pressure plate.

[0007] Optionally, the step of selecting multiple assembly components from a standard component database based on the mating dimension parameters includes: selecting a target mandrel in the standard component database whose mandrel diameter is equal to the impeller mating diameter; selecting a target expansion sleeve in the standard component database whose expansion sleeve outer diameter is equal to the impeller mating diameter and whose expansion sleeve length is less than or equal to the impeller mating width; selecting a target pressure plate in the standard component database whose inner diameter is equal to the positioning diameter of the mandrel and whose inner outer diameter is greater than the minimum diameter of the pressure plate; comparing the impeller mating width with the expansion sleeve length, and when the impeller mating width is less than the expansion sleeve length, selecting a target gasket in the standard component database whose inner diameter is equal to the impeller mating diameter.

[0008] Optionally, the simulated assembly of multiple assembly components with the impeller based on preset assembly rules includes: automatically aligning the shoulder coordinates of the target mandrel with the reference point of the impeller, making the target mandrel and the impeller coaxial; mate the inner conical surface of the target expansion sleeve with the outer conical surface of the target mandrel, and mate the outer surface of the target expansion sleeve with the inner hole of the impeller, while reserving a first preset allowance between the contact surface of the target expansion sleeve and the contact surface of the target mandrel as an assembly advance amount; when the impeller mating width is less than the width of the target expansion sleeve, assemble the target pad between the target pressure plate and the impeller, and make the inner diameter of the target pad equal to the inner diameter of the impeller; when the impeller mating width is greater than or equal to the width of the target expansion sleeve, directly attach the target pressure plate to the cross-section of the impeller; mate the inner hole of the target pressure plate with the positioning diameter of the target mandrel, and reserve a second preset allowance between the contact surface of the target pressure plate and the mating area of ​​the impeller.

[0009] Optionally, the first preset margin is 5 mm, and the second preset margin is 2 mm to 5 mm.

[0010] Optionally, after calculating the moment of inertia ratio based on the axial and radial moments of inertia, the method further includes: when the moment of inertia ratio does not meet the preset requirements, adjusting the mating dimension parameters, and recalculating the moment of inertia ratio of the impeller assembly mandrel based on the adjusted mating dimension parameters, until the recalculated moment of inertia ratio meets the preset requirements.

[0011] Optionally, adjusting the mating dimension parameters includes: increasing the diameter of the target mandrel or shortening the length of the target mandrel when the rotational inertia ratio is less than a preset lower threshold; and decreasing the thickness of the target pressure plate or adjusting the axial length of the target expansion sleeve when the rotational inertia ratio is greater than a preset upper threshold.

[0012] According to a second aspect of the present invention, an impeller assembly mandrel design apparatus is provided, the apparatus comprising: The drawing selection module is used to obtain the two-dimensional design drawing of the impeller, select a preset number of key points on the two-dimensional design drawing in sequence, and calculate at least one mating dimension parameter of the impeller based on the geometric relationship between the key points. The component matching module is used to select multiple assembly components from the standard component database according to the mating dimension parameters, and simulate the assembly of the multiple assembly components with the impeller based on preset assembly rules to generate an assembly model of the impeller assembly mandrel. The inertia calculation module is used to calculate the axial rotational inertia and radial rotational inertia of the impeller assembly mandrel based on the assembly model, and to calculate the rotational inertia ratio based on the axial rotational inertia and radial rotational inertia. The result output module is used to generate engineering drawings and a parts list of the impeller assembly mandrel when the rotational inertia ratio meets the preset requirements.

[0013] According to a third aspect of the present invention, a storage medium is provided having a computer program stored thereon, which, when executed by a processor, implements the above-described impeller assembly mandrel design method.

[0014] According to a fourth aspect of the present invention, a computer device is provided, including a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor executes the program to implement the above-described impeller assembly mandrel design method.

[0015] This invention provides a method, apparatus, storage medium, and computer device for designing an impeller assembly mandrel. By sequentially selecting a preset number of key points on a two-dimensional design drawing and automatically calculating mating dimensional parameters based on the geometric relationships between these key points, the traditional manual measurement and calculation process is transformed into automated processing, eliminating human error. Furthermore, based on the calculated mating dimensional parameters, multiple assembly components are automatically selected from a standard component database, transforming manual review and experience-based judgment into parameter-based database retrieval and matching. Then, based on preset assembly rules, the assembly components and impeller are automatically simulated and assembled, transforming manual assembly into rule-driven automated assembly. The axial and radial moments of inertia are automatically calculated from the assembly model, and the moment of inertia ratio is derived, eliminating the need for the traditional time-consuming and labor-intensive three-dimensional modeling and calculation process, thus reducing manual calculation time. Moreover, engineering drawings and parts lists are only generated when preset requirements are met, integrating the traditionally fragmented calculation, judgment, and output processes into an automated closed-loop verification process. In summary, the above methods improve the design efficiency of the combined mandrel, shorten the design cycle, eliminate errors caused by manual measurement and calculation, improve design accuracy, and ensure that the output design results meet the operating requirements of the test equipment in terms of rotational inertia characteristics, thereby ensuring the safety of the impeller high-speed rotation test.

[0016] The above description is only an overview of the technical solution of this application. In order to better understand the technical means of this application and to implement it in accordance with the contents of the specification, and to make the above and other objects, features and advantages of this application more obvious and understandable, the following are specific embodiments of this application. Attached Figure Description

[0017] The accompanying drawings, which are included to provide a further understanding of the invention and form part of this application, illustrate exemplary embodiments of the invention and, together with their description, serve to explain the invention and do not constitute an undue limitation thereof. In the drawings: Figure 1 A flowchart illustrating a method for designing an impeller assembly mandrel according to an embodiment of the present invention is shown. Figure 2 A flowchart illustrating another impeller assembly mandrel design method provided by an embodiment of the present invention is shown; Figure 3 This invention illustrates a structural schematic diagram of the selection of key impeller points in another impeller assembly mandrel design method provided by an embodiment of the present invention; Figure 4 This illustration shows an assembly diagram of the combined mandrel in another impeller combined mandrel design method provided by an embodiment of the present invention; Figure 5 This diagram shows a partially enlarged schematic of the assembly of the combined mandrel in another impeller combined mandrel design method provided by an embodiment of the present invention; Figure 6 This diagram shows a partially enlarged schematic of the expansion assembly in another impeller assembly mandrel design method provided by an embodiment of the present invention; Figure 7 This invention provides a schematic diagram illustrating the assembly of the pressure plate and the gasket in two scenarios in another impeller assembly mandrel design method. Figure 8 This illustration shows a partially enlarged schematic diagram of the threaded hole and screw in the assembly of the combined mandrel in another impeller combined mandrel design method provided by an embodiment of the present invention; Figure 9 This diagram illustrates the structure of an impeller assembly mandrel design device according to an embodiment of the present invention. Figure 10 This invention provides a schematic diagram of another impeller assembly mandrel design device. Figure 11 A schematic diagram of the device structure of a computer device provided in an embodiment of the present invention is shown. Detailed Implementation

[0018] Exemplary embodiments of the present application will now be described in more detail with reference to the accompanying drawings. While exemplary embodiments of the present application are shown in the drawings, it should be understood that the present application may be implemented in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that this application will be thorough and complete, and will fully convey the scope of the present application to those skilled in the art.

[0019] This application provides a method for designing an impeller assembly mandrel, such as... Figure 1As shown, the method includes the following steps: 101. Obtain the two-dimensional design drawing of the impeller, select a preset number of key points on the two-dimensional design drawing, and calculate at least one fitting dimension parameter of the impeller based on the geometric relationship between the key points.

[0020] Two-dimensional design drawings refer to engineering drawing files of centrifugal compressor impellers, which contain complete geometric and manufacturing information such as the impeller's outline shape, dimensions, and tolerance requirements. Key points refer to feature points with specific geometric significance on the two-dimensional outline of the impeller. These points are located at the intersections or endpoints of different outlines and can uniquely characterize the key mating parts of the impeller. The number of key points refers to the number of points selected in advance based on the types of mating parameters required for the combined mandrel design, to ensure that all mating dimension information required for the design can be completely extracted. The geometric relationship between key points refers to the distance or projected distance in a specific direction between different key points, such as the straight-line distance between two points or the projected distance between two points in the horizontal direction. The mating dimension parameters refer to the key geometric dimensions on the impeller that are directly related to the assembly of the combined mandrel, including the impeller mating diameter, impeller mating width, mandrel clearance distance, and minimum diameter of the pressure plate. These parameters are the basis for subsequent component selection and assembly.

[0021] Specifically, this step transforms the traditional manual process of measuring dimensions from two-dimensional drawings into an automated geometric calculation process based on key point selection. First, the two-dimensional design drawing of the impeller corresponding to the mandrel to be designed is obtained. Then, a fixed number of key points are selected sequentially on the two-dimensional outline of the impeller in a preset order. These key points are placed at positions with clear geometric significance in the impeller outline, such as the endpoints of the impeller's inner hole, the intersection of the impeller end face and the outer outline, etc. After the key point selection is completed, the system uses the coordinate information of each key point to automatically calculate the geometric relationship between different key points, including the straight-line distance and the horizontal projection distance, and outputs the calculation results as the fitting dimension parameters of the impeller. This step automates the operation that originally required manual measurement, recording, and calculation on the drawing using measuring tools.

[0022] In this embodiment, the system directly reads the coordinate information from the drawings for calculation, avoiding potential human errors, improving the accuracy of obtaining mating dimension parameters, significantly increasing parameter extraction efficiency, and achieving standardization and repeatability of the parameter extraction process. Consistent mating dimension parameters can be obtained, solving the problem of inconsistent design results caused by human differences in traditional manual methods, and laying a data foundation for subsequent automated component selection and assembly.

[0023] 102. Based on the mating dimension parameters, select multiple assembly parts from the standard parts database, and simulate the assembly of multiple assembly parts with the impeller based on the preset assembly rules to generate an assembly model of the impeller assembly mandrel.

[0024] The standard component database refers to a pre-built structured data set used to store the specification information of each component of the assembled mandrel. The database contains at least the model, size parameters, material properties, tooling numbers, etc. of components such as mandrel, expansion sleeve, pad, pressure plate, and fasteners, and supports conditional retrieval and matching. Assembly components refer to the various component parts required for assembling the mandrel, including mandrel, expansion sleeve, pad, pressure plate, and fasteners. Pre-defined assembly rules refer to a set of pre-defined logical rules used to constrain the relative positions and fit relationships between the assembly components, including the reference alignment rules between the mandrel and the impeller, the fit rules between the inner conical surface of the expansion sleeve and the outer conical surface of the mandrel, the fit rules between the outer surface of the expansion sleeve and the inner hole of the impeller, the conditional selection rules of the pad, the fit rules between the inner hole of the pressure plate and the positioning diameter of the mandrel, and the rules for the reserved allowance between each contact surface. The assembly model refers to the digital model generated after the simulated assembly is completed, which contains the geometric information, positional relationships, and assembly constraints of each component and can be used for subsequent calculation of performance parameters such as moment of inertia.

[0025] Specifically, the system first receives the mating dimension parameters calculated in the previous steps, and uses these parameters as search conditions to query and match in a pre-built standard component database. It automatically selects various assembly components that meet the dimensional requirements. For example, it selects the mandrel based on the impeller mating diameter, the expansion sleeve based on the impeller mating diameter and width, and the pressure plate based on the mandrel diameter and the minimum diameter of the pressure plate. It also determines whether a gasket needs to be selected based on the comparison between the impeller mating width and the expansion sleeve width. After the component selection is completed, the system calls the preset assembly rule set to automatically simulate the assembly of each selected assembly component with the impeller in a virtual environment. According to the rules, it sequentially determines the relative position of the mandrel and the impeller, the mating relationship between the expansion sleeve and the mandrel and the impeller, the conditional assembly of the gasket, and the positioning and clamping relationship of the pressure plate. Finally, it generates an impeller assembly mandrel assembly model containing complete geometric information and assembly constraint relationships of all assembly components.

[0026] In this embodiment, database retrieval based on mating dimension parameters automates and standardizes component selection, significantly shortening component selection time and ensuring consistency of selection results. Furthermore, preset rules automatically complete simulated assembly without manual intervention, solidifying complex assembly constraints into executable calculation logic, ensuring the accuracy and standardization of assembly relationships. Finally, the generated assembly model digitally records the geometric information and positional relationships of each component, which can be directly used as a data source for subsequent rotational inertia calculations.

[0027] 103. Calculate the axial and radial rotational inertia of the impeller assembly mandrel based on the assembly model, and calculate the ratio of rotational inertia based on the axial and radial rotational inertia.

[0028] Among them, axial moment of inertia refers to the moment of inertia of the impeller assembly mandrel when rotating about the central axis of the mandrel, reflecting the inertial characteristics of the assembly when rotating about the axis, and is an important parameter for evaluating the axial dynamic performance of the rotating body; radial moment of inertia refers to the moment of inertia of the impeller assembly mandrel when rotating about a diameter axis perpendicular to the axis of rotation, reflecting the mass distribution characteristics of the assembly in the radial direction; the moment of inertia ratio is the ratio of axial moment of inertia to radial moment of inertia, a key comprehensive index used to characterize the rotational dynamic characteristics of the impeller assembly mandrel, and is used to determine whether the dynamic balance performance of the assembly in high-speed rotation tests meets the operating requirements of the test equipment.

[0029] Specifically, the system first obtains the impeller assembly mandrel model generated in the previous steps. The model fully includes the geometry, dimensions, material density, and relative positional relationships of all components. Then, using the assembly model as the calculation object, the system automatically identifies and extracts the mass distribution information of each component. Based on the parallel axis theorem or integral calculation method, it calculates the axial moment of inertia of the entire assembly about its rotation axis and the radial moment of inertia about a direction perpendicular to the rotation axis. After completing the calculation of the axial and radial moments of inertia, the system performs a ratio calculation to obtain the moment of inertia ratio.

[0030] In this embodiment, by performing integrated calculations directly based on the assembly model, the manual calculation time is reduced, errors that may be introduced during manual calculation are eliminated, and the accuracy and reliability of the calculation results are ensured. The calculation of rotational inertia is standardized. Regardless of the specifications of the impeller and the combined mandrel, the same calculation logic and process are used, ensuring the consistency and comparability of results between different design tasks. The calculated rotational inertia ratio is output in the form of structured data, which can be directly called for subsequent judgment steps. This achieves seamless connection between calculation and judgment in the design process and provides a data foundation for automated closed-loop verification.

[0031] 104. When the moment of inertia ratio meets the preset requirements, generate the engineering drawings and parts list of the impeller assembly mandrel.

[0032] Among them, the preset requirements refer to the pre-set threshold conditions or value ranges used to judge whether the moment of inertia ratio is qualified. The specific requirements are determined according to the operating parameters of the test equipment, the specifications and models of the impeller, and industry design standards. Only when the moment of inertia ratio meets the preset requirements can the dynamic balance performance and safety of the impeller assembly mandrel in the high-speed rotation test be guaranteed. The engineering drawings refer to the technical drawing documents used to guide the actual manufacturing and assembly of the assembly mandrel. They include technical information such as the geometric dimensions, tolerance requirements, surface roughness, material specifications, and assembly relationships of each component such as the mandrel, expansion sleeve, gasket, and pressure plate. The bill of materials refers to the list of all materials required for the assembly mandrel. It includes at least the name, tooling number, item number, quantity, material, unit weight, and total weight of each component. It is used to guide material procurement, inventory management, and production assembly.

[0033] Specifically, this step first obtains the rotational inertia ratio calculated in the previous step and compares it with the preset requirements. When the result shows that the rotational inertia ratio meets the preset requirements, it indicates that the current impeller assembly mandrel design meets the operating standards and safety requirements of the test equipment in terms of dynamic performance. At this time, the system automatically triggers the drawing generation and bill of materials generation process. In terms of engineering drawing generation, the system automatically generates assembly mandrel engineering drawing files containing complete dimension annotations, tolerance annotations, technical requirements, etc., based on the assembly model and the geometric information of each component. The drawings can be directly used to guide production and manufacturing. In terms of bill of materials generation, the system automatically extracts the attribute information of each assembly component, including tooling number, item number, quantity, material, quality, etc., and summarizes them to generate a structured bill of materials. If the rotational inertia ratio does not meet the preset requirements, the system will not output drawings and bill of materials, but will trigger the optimization and adjustment process.

[0034] In this embodiment, an automated linkage mechanism between verification and output is established to ensure that the final design result is only output after the dynamic performance is qualified. This avoids the risk of unqualified solutions entering the production stage due to the disconnect between design, calculation, and verification in traditional methods. Furthermore, the system automates the generation of engineering drawings. Designers no longer need to manually draw two-dimensional drawings of the composite mandrel. The system automatically completes the drawing, dimensioning, and technical requirement filling based on the assembly model, significantly saving drawing time. Finally, the system automatically extracts the number, specifications, quantity, quality, and other information of each component from the database and summarizes them into a table, which improves efficiency and avoids errors in material information. In summary, this step forms a closed-loop design where drawings are only output after verification. Quality control is brought forward to the design stage, and only solutions that pass dynamic performance verification can output drawings, ensuring the safety and reliability of the impeller composite mandrel in high-speed rotation tests from the source.

[0035] The impeller assembly mandrel design method provided by this invention automatically calculates the mating dimensional parameters by sequentially selecting a preset number of key points on a two-dimensional design drawing and based on the geometric relationships between the key points. This transforms the traditional manual measurement and calculation process into automated processing, eliminating human error. Furthermore, it automatically selects multiple assembly components from a standard component database based on the calculated mating dimensional parameters, converting manual review and experience-based judgment into parameter-based database retrieval and matching. Then, based on preset assembly rules, it automatically simulates the assembly of the components and the impeller, transforming manual assembly into rule-driven automated assembly. The method automatically calculates the axial and radial moments of inertia based on the assembly model and derives the moment of inertia ratio, eliminating the need for the traditional time-consuming and labor-intensive three-dimensional modeling calculation process, thus reducing manual calculation time. Moreover, it generates engineering drawings and parts lists only when preset requirements are met, integrating the traditionally fragmented calculation, judgment, and output processes into an automated closed-loop verification process. In summary, this method improves the design efficiency of the assembly mandrel, shortens the design cycle, eliminates errors caused by manual measurement and calculation, improves design accuracy, and ensures that the output design results meet the operational requirements of the test equipment in terms of moment of inertia characteristics, thereby guaranteeing the safety of the impeller high-speed rotation test.

[0036] This application provides another method for designing an impeller assembly mandrel, such as... Figure 2 As shown, the method includes the following steps: 201. Select key points on the two-dimensional design drawing of the impeller, and calculate the fitting dimension parameters of the impeller based on the geometric relationship between the key points.

[0037] Specifically, the following steps are taken on the two-dimensional profile of the impeller in the two-dimensional design drawing: the inner bore profile, the upper end face profile, the lower end face profile, and the outer side profile. The intersection of the inner bore profile and the upper end face profile is designated as the first key point; the intersection of the inner bore profile and the lower end face profile is designated as the second key point; the intersection of the upper end face profile and the outer side profile is designated as the third key point; the intersection of the lower end face profile and the outer side profile is designated as the fourth key point; and the intersection of the lower end face profile and the inner bore profile is designated as the fifth key point. The distance between the first and second key points is calculated as the impeller fitting diameter; the distance between the first and third key points is calculated as the impeller fitting width; the horizontal distance between the first and fourth key points is calculated as the mandrel clearance distance; and the distance between the third and fifth key points is calculated as the minimum diameter of the pressure plate.

[0038] In this embodiment, after acquiring the two-dimensional design drawing of the impeller, the drawing is first analyzed to automatically identify the geometric features in the two-dimensional profile of the impeller and reconstruct the complete two-dimensional profile of the impeller. Based on this, the system intelligently sets five key points based on the profile features. Specifically, the system automatically identifies and determines four feature profile lines on the two-dimensional profile of the impeller: the impeller inner hole profile line, the impeller upper end face profile line, the impeller lower end face profile line, and the impeller outer profile line. The impeller inner hole profile line is used to characterize the inner boundary of the impeller's central through hole; the impeller upper end face profile line and the impeller lower end face profile line are used to characterize the profile boundaries of the two axial end faces of the impeller, respectively; and the impeller outer profile line is used to characterize the profile boundary of the impeller's radial outer edge. Based on these four profile lines, the system sequentially determines five key points according to a preset logic, such as... Figure 3 As shown, the intersection of the impeller inner bore contour line and the impeller upper end face contour line is taken as the first key point (point A), specifically located at the upper boundary of the impeller inner bore, serving as the upper reference for the impeller's mating diameter; the intersection of the impeller inner bore contour line and the impeller lower end face contour line is taken as the second key point (point B), located at the lower boundary of the impeller inner bore, which, together with the first key point, determines the axial length of the impeller inner bore; the intersection of the impeller upper end face contour line and the impeller outer side contour line is taken as the third key point (point C). The first key point (point D) is located at the junction of the upper end face and the outer edge of the impeller, and is used to characterize the radial outermost point of the upper end face of the impeller. The second key point (point E) is located at the junction of the lower end face and the outer edge of the impeller, and is used to characterize the radial outermost point of the lower end face of the impeller. The third key point (point E) is located at the junction of the lower end face and the inner hole of the impeller, and is used to characterize the boundary point of the inner hole of the lower end face of the impeller.

[0039] After selecting the five key points, the system automatically calculates the mating dimension parameters based on the coordinate information of each key point, according to the logic shown in Table 1 below. The straight-line distance between the first and second key points is calculated as the impeller mating diameter. This parameter is directly used to determine the required diameter of the mandrel; that is, the diameter of the mandrel should be equal to this mating diameter to ensure that the mandrel can form a correct mating relationship with the impeller inner hole. The straight-line distance between the first and third key points is calculated as the impeller mating width. This parameter is directly used to determine the axial dimension of the mandrel and the length selection of the expansion sleeve. The straight-line distance between the first and third key points is calculated as the impeller mating width. The horizontal distance between the four key points serves as the mandrel clearance distance. This parameter is used to prevent interference between the mandrel shoulder and the impeller. Specifically, the maximum diameter of the mandrel shoulder must be less than the calculated horizontal distance to ensure that the mandrel can smoothly enter the impeller's inner hole during assembly without colliding with the impeller end face. The straight-line distance between the third and fifth key points is calculated as the minimum diameter of the pressure plate. This parameter is used to ensure that the pressure plate can effectively press the impeller cross-section during assembly. Specifically, the minimum diameter of the area where the pressure plate and the impeller fit together must be greater than this distance to ensure that the pressure plate can provide sufficient pressing area, thereby reliably fixing the impeller.

[0040]

[0041] Table 1 This step integrates the traditional manual measurement, recording, and calculation processes into an automated point selection and calculation workflow. This not only eliminates errors caused by manual operation but also significantly improves the efficiency and accuracy of parameter extraction, providing a precise data foundation for subsequent automatic component matching and simulated assembly.

[0042] 202. Select multiple assembly parts from the standard parts database based on the mating dimension parameters.

[0043] Specifically, a target mandrel with a mandrel diameter equal to the impeller mating diameter is selected from the standard component database; a target expansion sleeve with an expansion sleeve outer diameter equal to the impeller mating diameter and an expansion sleeve length less than or equal to the impeller mating width is selected from the standard component database; a target pressure plate with an inner diameter equal to the mandrel's positioning diameter and an inner hole outer diameter greater than the minimum diameter of the pressure plate is selected from the standard component database; the impeller mating width is compared with the expansion sleeve length, and when the impeller mating width is less than the expansion sleeve length, a target gasket with an inner diameter equal to the impeller mating diameter is selected from the standard component database.

[0044] The composite mandrel is composed of multiple structural components, each of which performs a different function within the assembly, such as... Figure 4As shown, the mandrel 1 serves as the central support and positioning reference of the assembly. Its diameter must match the inner diameter of the impeller to ensure accurate insertion into the impeller's inner bore and provide stable rotational support. The expansion sleeve 2 is located on the outer circumference of the mandrel 1, with its inner conical surface mates with the outer conical surface of the mandrel and its outer surface mates with the inner bore of the impeller. It provides radial expansion force to tighten and position the impeller. Therefore, the outer diameter of the expansion sleeve must match the inner diameter of the impeller, while the length of the expansion sleeve must be selected according to the impeller's mating width to avoid the expansion sleeve being too long and exceeding the impeller's range or too short and failing to provide sufficient tightening area. The gasket 3 is located on the axial side of the expansion sleeve 2 and is used for axial positioning and adjustment when needed. Its function is to adjust the impeller's mating width. When the length of the expansion sleeve is less than that of the mandrel, the axial gap is filled to ensure that the pressure plate can effectively press the impeller cross-section. Therefore, the inner diameter of the mandrel must be equal to the inner diameter of the impeller to ensure the fit with the mandrel. The pressure plate 4 is located on the axial side of the mandrel 3 and is used to apply axial clamping force to fasten the impeller, expansion sleeve and other components to the mandrel. Its inner diameter must match the positioning diameter of the mandrel to ensure assembly accuracy, and its outer diameter must be greater than the minimum diameter of the pressure plate to ensure that the pressure plate and the impeller cross-section have sufficient contact area to provide reliable axial clamping force. The first screw 5 and the second screw 6 are fasteners used to fix the impeller, expansion sleeve and pressure plate to the mandrel. The plug gauge 7 is a detection element used to detect the size and position accuracy of the expansion sleeve.

[0045] In this embodiment, firstly, based on the impeller mating diameter calculated in the previous steps, a target mandrel with a diameter equal to the calculated mating diameter is selected from the standard component database. This ensures that the mandrel can form a correct mating relationship with the impeller inner hole, providing a precise positioning reference for the entire assembly. Secondly, based on the impeller mating diameter and impeller mating width, a target expansion sleeve with an outer diameter equal to the impeller mating diameter and a length less than or equal to the impeller mating width is selected from the standard component database. The equal outer diameter ensures that the outer surface of the expansion sleeve can fit tightly against the impeller inner hole, while the length condition ensures that the expansion sleeve does not exceed the axial range of the impeller, avoiding interference with the assembly of other components. Thirdly, based on the positioning diameter of the mandrel and the minimum diameter of the pressure plate, a target pressure plate with an inner hole diameter equal to the positioning diameter of the mandrel and an outer diameter greater than the minimum diameter of the pressure plate is selected from the standard component database. The equal inner hole diameter ensures that the pressure plate can be accurately fitted onto the mandrel. Axial positioning is achieved on the shaft. The outer diameter is larger than the minimum diameter of the pressure plate to ensure that the contact area between the pressure plate and the impeller cross-section is large enough to effectively transmit axial clamping force without local deformation. Finally, the impeller fit width is compared with the length of the target expansion sleeve. When the impeller fit width is smaller than the expansion sleeve length, it indicates that the expansion sleeve protrudes axially relative to the impeller. A shim needs to be added between the pressure plate and the impeller to fill the gap. In this case, a target shim with an inner diameter equal to the impeller fit diameter is selected from the standard component database so that the target shim can be fitted onto the mandrel and maintain a consistent fit with the impeller inner hole. When the impeller fit width is greater than or equal to the expansion sleeve length, no shim is needed, and the pressure plate can be directly fitted onto the impeller cross-section. Based on the above automatic selection rules, this application realizes intelligent selection of each component of the combined mandrel, realizes an automated process based on parameter matching, improves the accuracy and efficiency of selection, and ensures the assembly compatibility and functional reliability between the components.

[0046] 203. Simulate the assembly of multiple assembly components and impellers based on preset assembly rules.

[0047] Specifically, the shoulder coordinates of the target mandrel are automatically aligned with the reference point of the impeller, making the target mandrel and the impeller coaxial; the inner conical surface of the target expansion sleeve is fitted with the outer conical surface of the target mandrel, and the outer surface of the target expansion sleeve is fitted with the inner hole of the impeller, while a first preset allowance is reserved between the contact surface of the target expansion sleeve and the contact surface of the target mandrel as an assembly advance amount; when the impeller fit width is less than the width of the target expansion sleeve, a target pad is fitted between the target pressure plate and the impeller, and the inner diameter of the target pad is equal to the inner diameter of the impeller; when the impeller fit width is greater than or equal to the width of the target expansion sleeve, the target pressure plate is directly fitted onto the cross-section of the impeller; the inner hole of the target pressure plate is fitted with the positioning diameter of the target mandrel, and a second preset allowance is reserved between the contact surface of the target pressure plate and the contact area of ​​the impeller, wherein the first preset allowance is 5 mm, and the second preset allowance is 2 mm to 5 mm.

[0048] Among them, such as Figure 5 As shown, after completing the mandrel matching, the system first automatically aligns the shoulder coordinates of the target mandrel with the reference point (point A) of the impeller, ensuring that the target mandrel and impeller are on the same axis, achieving precise positioning of the mandrel and impeller, and providing a precise reference for the subsequent assembly of components; the assembly logic of the expansion sleeve is as follows: Figure 6 As shown, the inner conical surface of the target expansion sleeve and the outer conical surface of the target mandrel mate to form a conical contact relationship. Simultaneously, the outer surface of the target expansion sleeve mates with the inner bore of the impeller. It is worth noting that a first preset allowance of 5 mm is required between the contact surface of the expansion sleeve and the contact surface of the mandrel to allow for assembly advance. This ensures sufficient advance space for the expansion sleeve during assembly, enabling it to generate the required radial expansion force through axial movement, thereby achieving reliable tightening and positioning of the impeller. Figure 7As shown, the assembly of the pressure plate and the gasket is divided into two cases based on the comparison between the impeller fit width and the expansion sleeve width. Case 1 involves a gasket structure: when the impeller fit width is less than the target expansion sleeve width, it indicates that the expansion sleeve protrudes axially relative to the impeller. In this case, a target gasket needs to be installed between the target pressure plate and the impeller to increase the assembly distance of the pressure plate. Furthermore, the inner diameter of the target gasket must be equal to the inner diameter of the impeller to ensure that the gasket can be accurately fitted onto the mandrel and maintain coaxiality with the impeller's inner bore. Case 2 involves a gasket-less structure: when the impeller fit width is greater than or equal to the target expansion sleeve width, no gasket is needed. The target pressure plate can be directly fitted onto the impeller's cross-section to achieve axial compression. In both cases, the inner bore of the target pressure plate needs to match the positioning diameter of the target mandrel to ensure that the pressure plate can be accurately fitted onto the mandrel and move freely axially. Simultaneously, a second preset allowance needs to be reserved between the contact surface of the target pressure plate and the contact area of ​​the impeller. This second preset allowance is 2 mm to 5 mm. mm, this ensures that the pressure plate has an appropriate adjustment range when applying axial clamping force, which can ensure effective clamping while avoiding deformation or damage to components due to over-clamping; such as Figure 8 As shown, after completing the above assembly, the system also sets the screw reference point coordinates, takes the impeller assembly reference point A as the zero point, automatically calculates the x and y coordinate values ​​of the screw assembly point, and automatically generates the screw length according to the thread depth parameter of the target expansion sleeve, thereby realizing the automatic matching and assembly of fasteners.

[0049] In this embodiment, by using the above-mentioned simulated assembly rules, this application realizes the automated processing of complex assembly relationships between the components of the combined mandrel. It transforms the traditional design operations, such as conical surface mating alignment, contact allowance control, and conditional selection of bushings, which rely on manual experience, into a rule-driven automated assembly process. This not only ensures the accuracy and consistency of the assembly relationship, but also guarantees the adjustability and reliability of the assembly through the reasonable setting of preset allowances.

[0050] 204. Calculate the axial and radial rotational inertia of the impeller assembly mandrel based on the assembly model, and calculate the ratio of rotational inertia based on the axial and radial rotational inertia.

[0051] In this embodiment, after completing the simulated assembly of the impeller mandrel and generating a complete assembly model, the system automatically executes the moment of inertia verification process. This process uses the assembly model as the calculation object, performing integrated calculations on the overall dynamic characteristics of the assembly. First, the total mass of the impeller mandrel assembly is calculated by summing the masses of all components in the assembly model. Next, the center of mass of the assembly is calculated. Based on the mass distribution of each component and its spatial coordinates in the assembly coordinate system, the center of mass coordinates of the entire assembly are determined by a weighted average. Finally, the axial moment of inertia of the assembly about its rotation axis is calculated, reflecting the inertia of the assembly when rotating around the central axis of the mandrel. The axial dynamic performance of the rotating body is a key indicator for evaluating its axial dynamic performance. Finally, the radial moment of inertia of the assembly about the diameter direction perpendicular to the axis of rotation is calculated, reflecting the mass distribution characteristics of the assembly in the radial direction. After completing the calculation of various parameters, the system automatically calculates the ratio of axial moment of inertia to radial moment of inertia to obtain the moment of inertia ratio. The moment of inertia ratio is a comprehensive indicator characterizing the rotational dynamic characteristics of the impeller assembly spindle and is used to determine whether the current design scheme meets the operating requirements of the test equipment. The system compares the calculated moment of inertia ratio with the preset threshold conditions, which are determined according to the operating parameters of the test equipment, the specifications of the impeller, and industry design standards.

[0052] 205. When the moment of inertia ratio meets the preset requirements, generate the engineering drawings and parts list of the impeller assembly mandrel.

[0053] In this embodiment, when the rotational inertia ratio meets the preset requirements, i.e., after verification, the system automatically generates engineering drawings and a parts list for the assembled mandrel. Regarding the engineering drawing generation, the system automatically generates engineering drawings for the assembled mandrel, including complete dimension annotations, tolerance requirements, and technical conditions, based on the geometric information and assembly relationships of each component in the assembly model. These drawings can be directly used to guide actual production and manufacturing. Regarding the parts list generation, the system automatically extracts drawing data from the 1:1 scale drawing area in the generated assembled mandrel engineering drawings. Specifically, the system identifies the 1:1 scale drawing area in the engineering drawings and extracts the drawing data corresponding to each component within the area, including the outline information, annotation information, and associated attributes of each component. Based on this, the system automatically performs data calculation and query through preset related logic. On the one hand, the system automatically calculates the assembly ratio of each component based on the extracted drawing data. The system automatically calculates the quantity of each component based on its material density and geometric dimensions. Simultaneously, it uses extracted drawing data as search criteria to automatically query the standard component database, outputting the corresponding tooling numbers for mandrels, expansion sleeves, washers, and pressure plates. It also queries and outputs the code, model number, and item number of any picked-up screws. Finally, the system summarizes all the information obtained from the automatic calculations and queries to generate a complete mandrel assembly list. This list includes at least the name, tooling number, item number, quantity, unit weight, and total weight of each component. Through this method, the system achieves fully automated list generation. Designers no longer need to manually consult manuals to enter component numbers or manually calculate quantities and weights; all information is automatically retrieved, calculated, and queried by the system, improving design efficiency and ensuring the accuracy and completeness of the list information.

[0054] 206. When the moment of inertia ratio does not meet the preset requirements, adjust the fitting dimension parameters and recalculate the moment of inertia ratio of the impeller assembly mandrel based on the adjusted fitting dimension parameters until the recalculated moment of inertia ratio meets the preset requirements.

[0055] Specifically, when the rotational inertia ratio is less than the preset lower threshold, the diameter of the target mandrel is increased or the length of the target mandrel is shortened; when the rotational inertia ratio is greater than the preset upper threshold, the thickness of the target pressure plate is reduced or the axial length of the target expansion sleeve is adjusted.

[0056] In this embodiment, when the calculated result of the rotational inertia ratio does not meet the preset requirements, it indicates that the current design scheme needs to be optimized and adjusted. Specifically, the system automatically identifies the components that need adjustment and the adjustment strategy based on the deviation direction of the rotational inertia ratio. If the rotational inertia ratio is too small, it indicates that the axial rotational inertia is insufficient relative to the radial rotational inertia. The system automatically increases the diameter of the target mandrel or shortens the length of the target mandrel to increase the axial mass distribution. If the rotational inertia ratio is too large, it indicates that the radial rotational inertia is insufficient relative to the axial rotational inertia. The system automatically reduces the thickness of the pressure plate or adjusts the axial length of the expansion sleeve to optimize the radial mass distribution. After completing the adjustment of the dimensional parameters, the system automatically updates the assembly model and re-executes the rotational inertia verification process, including recalculating the mass, center of mass, axial rotational inertia, radial rotational inertia, and rotational inertia ratio, and comparing them with the preset requirements again until the rotational inertia ratio meets the preset requirements, thereby forming a complete closed-loop intelligent design and verification process.

[0057] Furthermore, as Figure 1 In a specific implementation of the method, this application provides an impeller assembly mandrel design device, such as... Figure 9 As shown, the device includes: a drawing point selection module 301, a component matching module 302, an inertia calculation module 303, and a result output module 304.

[0058] The drawing selection module 301 is used to obtain the two-dimensional design drawing of the impeller, select a preset number of key points on the two-dimensional design drawing in sequence, and calculate at least one mating dimension parameter of the impeller based on the geometric relationship between the key points. The component matching module 302 is used to select multiple assembly components from the standard component database according to the mating dimension parameters, and simulate the assembly of the multiple assembly components with the impeller based on the preset assembly rules to generate an assembly model of the impeller assembly mandrel. The inertia calculation module 303 is used to calculate the axial rotational inertia and radial rotational inertia of the impeller assembly mandrel based on the assembly model, and to calculate the rotational inertia ratio based on the axial rotational inertia and radial rotational inertia. The result output module 304 is used to generate engineering drawings and a parts list of the impeller assembly mandrel when the rotational inertia ratio meets the preset requirements.

[0059] In specific application scenarios, the mating dimensional parameters include the impeller mating diameter, impeller mating width, mandrel clearance distance, and minimum pressure plate diameter. The drawing point selection module 301 is specifically used to determine the impeller inner hole contour line, impeller upper end face contour line, impeller lower end face contour line, and impeller outer contour line on the two-dimensional outline of the impeller in the two-dimensional design drawing. The intersection of the impeller inner hole contour line and the impeller upper end face contour line is taken as the first key point, and the intersection of the impeller inner hole contour line and the impeller lower end face contour line is taken as the second key point. The intersection of the contour lines is designated as the third key point; the intersection of the impeller lower end face contour line and the impeller outer contour line is designated as the fourth key point; and the intersection of the impeller lower end face contour line and the impeller inner hole contour line is designated as the fifth key point. The distance between the first and second key points is calculated as the impeller mating diameter; the distance between the first and third key points is calculated as the impeller mating width; the horizontal distance between the first and fourth key points is calculated as the mandrel clearance distance; and the distance between the third and fifth key points is calculated as the minimum diameter of the pressure plate.

[0060] In specific application scenarios, the component matching module 302 is specifically used to select a target mandrel whose mandrel diameter is equal to the impeller mating diameter from the standard component database; to select a target expansion sleeve whose expansion sleeve outer diameter is equal to the impeller mating diameter and whose expansion sleeve length is less than or equal to the impeller mating width from the standard component database; to select a target pressure plate whose inner diameter is equal to the positioning diameter of the mandrel and whose inner diameter outer diameter is greater than the minimum diameter of the pressure plate from the standard component database; and to compare the impeller mating width with the expansion sleeve length. When the impeller mating width is less than the expansion sleeve length, a target gasket whose inner diameter is equal to the impeller mating diameter is selected from the standard component database.

[0061] In specific application scenarios, the component matching module 302 is also used to automatically align the shoulder coordinates of the target mandrel with the reference point of the impeller, making the target mandrel and the impeller coaxial; to mate the inner conical surface of the target expansion sleeve with the outer conical surface of the target mandrel, and to mate the outer surface of the target expansion sleeve with the inner hole of the impeller, while reserving a first preset allowance between the contact surface of the target expansion sleeve and the contact surface of the target mandrel as an assembly advance amount; when the impeller mating width is less than the width of the target expansion sleeve, a target pad is assembled between the target pressure plate and the impeller, and the inner diameter of the target pad is equal to the inner diameter of the impeller; when the impeller mating width is greater than or equal to the width of the target expansion sleeve, the target pressure plate is directly fitted onto the cross-section of the impeller; the inner hole of the target pressure plate is matched with the positioning diameter of the target mandrel, and a second preset allowance is reserved between the contact surface of the target pressure plate and the mating area of ​​the impeller.

[0062] In specific application scenarios, the first preset margin is 5 mm, and the second preset margin is 2 mm to 5 mm.

[0063] In specific application scenarios, such as Figure 10 As shown, the device also includes a size adjustment module 305, which is specifically used to adjust the mating size parameters when the rotational inertia ratio does not meet the preset requirements, and recalculate the rotational inertia ratio of the impeller assembly mandrel based on the adjusted mating size parameters until the recalculated rotational inertia ratio meets the preset requirements.

[0064] In specific application scenarios, the size adjustment module 305 is also used to increase the diameter of the target mandrel or shorten the length of the target mandrel when the rotational inertia ratio is less than the preset lower threshold; and to reduce the thickness of the target pressure plate or adjust the axial length of the target expansion sleeve when the rotational inertia ratio is greater than the preset upper threshold.

[0065] It should be noted that other corresponding descriptions of the functional units involved in the impeller assembly mandrel design device provided in this embodiment can be found in [reference]. Figure 1 The corresponding description in [the document] will not be repeated here.

[0066] Based on the above, Figure 1 Accordingly, this embodiment also provides a storage medium storing a computer program that, when executed by a processor, implements the above-described impeller assembly mandrel design method.

[0067] Based on this understanding, the technical solution of this application can be embodied in the form of a software product. The software product to be identified can be stored in a non-volatile storage medium (such as a CD-ROM, USB flash drive, or portable hard drive), including several instructions to enable a computer device (such as a personal computer, server, or network device) to execute the impeller assembly mandrel design method of various implementation scenarios of this application.

[0068] Based on the above, Figure 1 and Figure 2 The method shown, and Figure 9 and Figure 10 The impeller assembly mandrel design device embodiment shown is designed to achieve the above objectives, such as... Figure 11 As shown, this embodiment also provides a physical device for designing an impeller assembly mandrel. This device includes a communication bus, a processor, a memory, and a communication interface. It may also include input / output interfaces and a display device. The various functional units can communicate with each other via the bus. The memory stores a computer program, and the processor executes the program stored in the memory to perform the impeller assembly mandrel design method described in the above embodiment.

[0069] Optionally, the physical device may also include a user interface, a network interface, a camera, radio frequency (RF) circuitry, sensors, audio circuitry, a Wi-Fi module, etc. The user interface may include a display screen, input units such as a keyboard, etc., and optional user interfaces may also include USB interfaces, card reader interfaces, etc. The network interface may optionally include standard wired interfaces, wireless interfaces (such as Wi-Fi interfaces), etc.

[0070] Those skilled in the art will understand that the impeller assembly mandrel design physical device structure provided in this embodiment does not constitute a limitation on the physical device, and may include more or fewer components, or combine certain components, or have different component arrangements.

[0071] The storage medium may also include an operating system and a network communication module. The operating system is a program that manages the hardware and software resources of the aforementioned physical device, supporting the operation of information processing programs and other software and / or programs to be identified. The network communication module is used to enable communication between the various components within the storage medium, as well as communication with other hardware and software in the information processing physical device.

[0072] Through the above description of the embodiments, those skilled in the art can clearly understand that this application can be implemented by means of software plus necessary general-purpose hardware platforms, or it can be implemented by hardware. By applying the technical solution of this application, by sequentially selecting a preset number of key points on the two-dimensional design drawings and automatically calculating the mating dimension parameters according to the geometric relationship between the key points, the traditional manual measurement and calculation process is transformed into automated processing, eliminating human error. Furthermore, based on the calculated mating dimension parameters, multiple assembly parts are automatically selected from the standard parts database, transforming manual review and experience judgment into parameter-based database retrieval and matching. Then, based on preset assembly rules, the assembly parts and impeller are automatically simulated and assembled, transforming manual assembly into rule-driven automatic assembly. The axial and radial moments of inertia are automatically calculated according to the assembly model, and the moment of inertia ratio is obtained, eliminating the need for the traditional time-consuming and labor-intensive three-dimensional modeling calculation process, reducing manual calculation time. Moreover, engineering drawings and parts lists are only generated when preset requirements are met, integrating the traditional scattered calculation, judgment, and output process into an automated closed-loop verification process. In summary, the above methods improve the design efficiency of the combined mandrel, shorten the design cycle, eliminate errors caused by manual measurement and calculation, improve design accuracy, and ensure that the output design results meet the operating requirements of the test equipment in terms of rotational inertia characteristics, thereby ensuring the safety of the impeller high-speed rotation test.

[0073] Those skilled in the art will understand that the accompanying drawings are merely schematic diagrams of a preferred embodiment, and the modules or processes shown in the drawings are not necessarily essential for implementing this application. Those skilled in the art will understand that the modules in the apparatus of the embodiment can be distributed within the apparatus of the embodiment as described, or can be modified to be located in one or more apparatuses different from this embodiment. The modules of the above-described embodiment can be combined into one module, or further divided into multiple sub-modules.

[0074] The serial numbers in this application are for descriptive purposes only and do not represent the superiority or inferiority of any particular implementation scenario. The above disclosures are merely a few specific implementation scenarios of this application; however, this application is not limited thereto, and any variations conceived by those skilled in the art should fall within the protection scope of this application.

Claims

1. A method of impeller assembly mandrel design, characterized by, include: Obtain a two-dimensional design drawing of the impeller, select a preset number of key points on the two-dimensional design drawing in sequence, and calculate at least one mating dimension parameter of the impeller based on the geometric relationship between the key points; Based on the mating dimension parameters, multiple assembly components are selected from the standard component database, and the multiple assembly components are simulated to assemble with the impeller based on preset assembly rules to generate an assembly model of the impeller assembly mandrel. The axial and radial moments of inertia of the impeller assembly mandrel are calculated based on the assembly model, and the ratio of moments of inertia is calculated based on the axial and radial moments of inertia. When the rotational inertia ratio meets the preset requirements, engineering drawings and a parts list of the impeller assembly mandrel are generated.

2. The method according to claim 1, characterized in that, The fitting dimensional parameters include the impeller fitting diameter, impeller fitting width, mandrel clearance distance, and minimum diameter of the pressure plate; obtaining the two-dimensional design drawing of the impeller, sequentially selecting a preset number of key points on the two-dimensional design drawing, and calculating at least one fitting dimensional parameter of the impeller based on the geometric relationship between the key points, including: On the two-dimensional profile of the impeller in the two-dimensional design drawing, determine the inner hole profile line of the impeller, the upper end face profile line of the impeller, the lower end face profile line of the impeller, and the outer side profile line of the impeller. The intersection of the impeller inner hole contour line and the impeller upper end face contour line is taken as the first key point; the intersection of the impeller inner hole contour line and the impeller lower end face contour line is taken as the second key point; the intersection of the impeller upper end face contour line and the impeller outer contour line is taken as the third key point; the intersection of the impeller lower end face contour line and the impeller outer contour line is taken as the fourth key point; and the intersection of the impeller lower end face contour line and the impeller inner hole contour line is taken as the fifth key point. The distance between the first key point and the second key point is calculated as the impeller fitting diameter; the distance between the first key point and the third key point is calculated as the impeller fitting width; the horizontal distance between the first key point and the fourth key point is calculated as the mandrel clearance distance; and the distance between the third key point and the fifth key point is calculated as the minimum diameter of the pressure plate.

3. The method according to claim 1, characterized in that, The step of selecting multiple assembly components from the standard component database based on the mating dimension parameters includes: Select a target mandrel from the standard component database whose mandrel diameter is equal to the impeller's mating diameter; Select a target expansion sleeve from the standard component database whose outer diameter is equal to the impeller mating diameter and whose length is less than or equal to the impeller mating width; Select a target pressure plate from the standard component database whose inner diameter is equal to the positioning diameter of the mandrel and whose outer diameter is greater than the minimum diameter of the pressure plate. The impeller fit width is compared with the expansion sleeve length. When the impeller fit width is less than the expansion sleeve length, a target sleeve with an inner diameter equal to the impeller fit diameter is selected from the standard component database.

4. The method according to claim 3, characterized in that, The simulated assembly of multiple assembly components with the impeller based on preset assembly rules includes: The shoulder coordinates of the target mandrel are automatically aligned with the reference point of the impeller, so that the target mandrel and the impeller are coaxial. The inner conical surface of the target expansion sleeve is fitted with the outer conical surface of the target mandrel, and the outer surface of the target expansion sleeve is fitted with the inner hole of the impeller. At the same time, a first preset allowance is reserved between the contact surface of the target expansion sleeve and the contact surface of the target mandrel as the assembly push amount. When the impeller fit width is less than the target expansion sleeve width, the target gasket is assembled between the target pressure plate and the impeller, and the inner diameter of the target gasket is equal to the inner diameter of the impeller. When the impeller fit width is greater than or equal to the width of the target expansion sleeve, the target pressure plate is directly fitted onto the cross-section of the impeller; The inner hole of the target pressure plate is matched with the positioning diameter of the target mandrel, and a second preset allowance is reserved between the contact surface of the target pressure plate and the contact area of ​​the impeller.

5. The method according to claim 4, characterized in that, The first preset margin is 5 mm, and the second preset margin is 2 mm to 5 mm.

6. The method according to claim 3, characterized in that, After calculating the ratio of moments of inertia based on the axial and radial moments of inertia, the method further includes: When the rotational inertia ratio does not meet the preset requirements, the fitting dimension parameters are adjusted, and the rotational inertia ratio of the impeller assembly mandrel is recalculated based on the adjusted fitting dimension parameters until the recalculated rotational inertia ratio meets the preset requirements.

7. The method according to claim 6, characterized in that, The adjustment of the mating dimension parameters includes: When the rotational inertia ratio is less than a preset lower threshold, the diameter of the target mandrel is increased or the length of the target mandrel is shortened. When the rotational inertia ratio is greater than a preset upper limit threshold, the thickness of the target pressure plate is reduced or the axial length of the target expansion sleeve is adjusted.

8. A design device for an impeller assembly mandrel, characterized in that, The device includes: The drawing selection module is used to obtain the two-dimensional design drawing of the impeller, select a preset number of key points on the two-dimensional design drawing in sequence, and calculate at least one mating dimension parameter of the impeller based on the geometric relationship between the key points. The component matching module is used to select multiple assembly components from the standard component database according to the mating dimension parameters, and simulate the assembly of the multiple assembly components with the impeller based on preset assembly rules to generate an assembly model of the impeller assembly mandrel. The inertia calculation module is used to calculate the axial rotational inertia and radial rotational inertia of the impeller assembly mandrel based on the assembly model, and to calculate the rotational inertia ratio based on the axial rotational inertia and radial rotational inertia. The result output module is used to generate engineering drawings and a parts list of the impeller assembly mandrel when the rotational inertia ratio meets the preset requirements.

9. A storage medium having a computer program stored thereon, characterized in that, When the computer program is executed by a processor, it implements the steps of the method according to any one of claims 1 to 7.

10. A computer device, comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, characterized in that, When the computer program is executed by a processor, it implements the steps of the method according to any one of claims 1 to 7.

Images