CN114781168A - Parameterization design method and system of centrifugal pump - Google Patents
Parameterization design method and system of centrifugal pump Download PDFInfo
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- CN114781168A CN114781168A CN202210467896.9A CN202210467896A CN114781168A CN 114781168 A CN114781168 A CN 114781168A CN 202210467896 A CN202210467896 A CN 202210467896A CN 114781168 A CN114781168 A CN 114781168A
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Abstract
The invention discloses a parametric design method and a parametric design system of a centrifugal pump, belonging to the field of water pump design. The method and the system can improve the design efficiency of the centrifugal pump, reduce the design cost and improve the quality, and have obvious practical application value and demonstration value.
Description
Technical Field
The invention relates to the field of water pump design, in particular to a parameterization design method and a parameterization design system of a centrifugal pump.
Background
Centrifugal pumps are fluid machines that work by centrifugal force and are widely used in hydraulic engineering, industrial engineering, mining engineering, petrochemical engineering, aviation and navigation engineering, urban water supply and drainage engineering, etc. due to their high rotational speed, small size, compact structure, wide range of flow and lift use and high efficiency. According to statistics, the pump is the most widely used general machine in national economy, the power consumption of the pump accounts for about 20% of the total power generation amount in China and about 5% of the total fuel consumption in China, and the power consumption of the centrifugal pump accounts for about 80% of the total amount of the used pump and about 12% of the total power generation amount. Therefore, the centrifugal pump has the advantages of improving the lift and the efficiency of the centrifugal pump and having very important significance for energy conservation and environmental protection.
In the aspect of centrifugal pump design, most enterprises still adopt a traditional design method at present, a two-dimensional wood pattern is drawn firstly, corresponding data is calculated according to the wood pattern, then a three-dimensional graph is drawn to establish a solid model, the calculation amount is large, the drawing of the three-dimensional graph is complex, the rapid development and the optimized design of products are not facilitated, and the design efficiency and the quality are seriously influenced.
Disclosure of Invention
In order to solve the defects of the prior art, the invention provides a parameterized design method and a parameterized design system of a centrifugal pump, which can realize parameterized rapid design of a water suction chamber, an impeller and a pumping chamber of the centrifugal pump according to input parameters and output a three-dimensional parameterized model for display and modification.
The present invention achieves the above-described object by the following technical means.
A parametric design method of a centrifugal pump comprises the following steps:
s1: initializing structural parameters of the centrifugal pump: setting initial design parameters of the centrifugal pump, and calculating main geometric parameters of an impeller, a water suction chamber and a water pumping chamber in the centrifugal pump through a speed coefficient method and an empirical formula;
s2: extracting main geometric parameters of the centrifugal pump impeller, designing an impeller axial plane and twisted blades based on the main geometric parameters, determining three-dimensional data of the impeller through calculation, and establishing a three-dimensional parameterized model of the impeller and exporting the data by calling a three-dimensional modeling software interface according to the three-dimensional data of the impeller;
s3: extracting data of a water suction chamber and a water pumping chamber of the centrifugal pump, designing the water suction chamber and the water pumping chamber respectively on the basis of the data, determining three-dimensional data of the water suction chamber and the water pumping chamber through calculation, calling a three-dimensional modeling software interface to establish a three-dimensional parameterized model of the water suction chamber and the water pumping chamber, and exporting the data.
In the above scheme, in step S1, the initial design parameters of the centrifugal pump include: flow, lift, rotation speed, efficiency, necessary cavitation allowance and medium density, wherein the efficiency, the necessary cavitation allowance and the medium density are in default values if not specified; main geometric parameters of the impeller: the impeller inlet diameter, the impeller outlet width, the blade inlet installation angle, the impeller outlet installation angle, the number of blades, the blade wrap angle and the blade thickness; the main geometrical parameters of the water suction chamber are as follows: the diameter of the inlet of the water suction chamber, the diameter of the outlet of the water suction chamber and the length of the water suction chamber; main geometric parameters of the pumping chamber: base circle diameter, volute width, spacer tongue mounting angle, outlet diameter, diffusion angle and diffusion tube length.
In the above scheme, in step S2, according to the main geometric parameters of the impeller, an impeller axial flow line may be designed by using a Bezier curve with 5 points and 4 times, or a connection manner between an arc and a straight line is selected, an impeller flow cross-section area change diagram is displayed, and the position of a control point is adjusted to obtain impeller axial data.
According to the scheme, according to main geometric parameters of the impeller and axial plane data of the impeller, a high-order Bezier curve is adopted as a blade molded line to calculate and obtain three-dimensional data points of the blade, and then a Nurbs curve is used for fitting, so that the shape of the blade is finely controlled on the premise of meeting the blade inlet setting angle, the blade outlet setting angle and the blade wrap angle, and the hydraulic effect of the centrifugal pump is improved.
In the above scheme, in step S3, according to the main geometric parameters of the pumping chamber, 8 cross sections forming 45 ° with each other are selected on the plane of the pumping chamber, the shape of the cross section is a trapezoidal cross section formed by connecting a Bezier curve and a straight line, and the cross section is combined into a volute of the pumping chamber, and 3 arc cross sections with different intervals can be selected to combine into a diffuser of the pumping chamber, or an arc, a straight line, a spline curve, or a polynomial curve is selected to be mixed into the shape of the cross section.
In the scheme, the software for establishing the three-dimensional parameterized models of the water suction chamber, the impeller and the water pumping chamber of the centrifugal pump is open-source three-dimensional modeling software FreCAD.
The design system of the parametric design method of the centrifugal pump comprises a parameter input and output module, a data processing and transmission module, a model establishing and displaying module and a data and user management module;
the parameter input and output module comprises a parameter input and output unit and a parameter display unit, and is used for inputting and modifying parameters, outputting corresponding parameters, and displaying the format of the parameters and whether the parameters are default values;
the data processing and transmission module comprises a calculation formula, a curve function unit and a data transmission unit, calculates corresponding data according to the calculation formula and the curve function related to the built-in centrifugal pump, and transmits the data among different modules;
the model establishing and displaying module comprises a three-dimensional model establishing unit and a model displaying unit, and is used for calling an internal library function of three-dimensional modeling software according to the transmitted data to complete a series of parameterized modeling for establishing and displaying a parameterized model;
and the data and user management module comprises a data export unit and a user management unit, and exports different three-dimensional model data to a folder managed by the user in a specified format for data file management and user data management.
In the above scheme, in the parameter input and output module, the visual interface is developed by adopting PyQt5, which is convenient for displaying and modifying the input parameters and the output parameters.
In the above solution, in the data processing and transmitting module, the defined curve function includes: bezier curve functions, spline interpolation curve functions, polynomial curve functions and Nurbs curve functions.
In the scheme, the model building and displaying module is provided with the internal library function of the three-dimensional modeling software, and the internal library function can be directly called through a Python programming language as required to build and preview the three-dimensional entity model and the three-dimensional fluid domain model.
Compared with the prior art, the invention has the following beneficial effects:
1. in the aspect of a centrifugal pump parametric design method, a high-order bezier curve is adopted to design an impeller shaft surface and three-dimensional twisted blades, so that the three-dimensional shape of the impeller shaft surface and the three-dimensional twisted blades can be finely controlled to achieve the purpose of improving the hydraulic effect of the centrifugal pump, and the curve shape can be controlled by using fewer parameters to facilitate subsequent optimization.
2. In the aspect of a parametric design system of the centrifugal pump, the functions of two-dimensional parameter input and three-dimensional design output are integrated, a user can realize the rapid and accurate three-dimensional parametric design of a water suction chamber, an impeller and a water pressing chamber of the centrifugal pump after inputting some basic parameters and calculating, and final three-dimensional model data is output according to requirements, so that the design efficiency can be improved, the design cost can be reduced, the quality can be improved, and the method has obvious practical application value and demonstration value.
3. The parametric design method has a series of advantages of reducing design cost, shortening development period, being capable of integration and the like, realizes the parametric design of main flow passage components of the centrifugal pump, such as an impeller, a water suction chamber and a water pumping chamber, and greatly improves design efficiency, reduces design cost and improves quality.
Drawings
Fig. 1 is a schematic flow chart of a parametric design method of a centrifugal pump according to embodiment 1 of the present invention;
FIG. 2 is a schematic structural diagram of a parametric design system of a centrifugal pump provided in embodiment 2 of the present invention;
FIG. 3 is a schematic diagram of a three-dimensional parameterized solid model of an impeller of the centrifugal pump parameterized design method provided in embodiment 1 of the present invention;
FIG. 4 is a schematic diagram of a three-dimensional parameterized solid model of a pumping chamber and a suction chamber of a centrifugal pump parameterized design method provided in embodiment 1 of the invention;
fig. 5 is a schematic diagram of a three-dimensional parameterized fluid domain model of a centrifugal pump in the parameterized design method of the centrifugal pump provided in embodiment 1 of the present invention.
Detailed Description
Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like reference numerals refer to the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the drawings are illustrative and intended to be illustrative of the invention and are not to be construed as limiting the invention.
Example 1
Referring to the attached figure 1, the parametric design method of the centrifugal pump comprises the following specific steps:
step 1: after the centrifugal pump parametric design system is started, a designer inputs initial design parameters of the centrifugal pump, and can modify default values of the initial design parameters.
Step 2: the system extracts the initial design parameters of the centrifugal pump, calculates the main geometric parameters of the water suction chamber, the impeller and the pumping chamber of the centrifugal pump through a built-in formula of the system, and displays and modifies the parameters.
And 3, step 3: according to the main geometric parameters of the centrifugal pump impeller, the axial surface of the impeller is designed by adopting a Bezier curve based on the geometric parameters, and the flow cross-section area of the axial surface is checked to ensure the reasonability of the design of an axial surface flow passage.
And 4, step 4: drawing a blade profile chart by adopting a high-order Bezier curve, finely controlling the shape of the blade on the premise of meeting the installation angle and wrap angle of the inlet and outlet of the blade, and calculating three-dimensional data of the twisted blade according to axial plane parameters of the impeller;
and 5: according to main geometric parameters of a water suction chamber of the centrifugal pump, 8 sections which form an angle of 45 degrees with each other are selected on the plane of the pressurized water chamber, the shapes of the sections are defaulted to adopt trapezoidal sections formed by connecting Bezier curves and straight lines to form a pressurized water chamber volute, and 3 arc sections with different intervals are selected to form a pressurized water chamber diffusion pipe;
and 6: according to the main geometric parameters of the water suction chamber of the centrifugal pump, two arcs separated by a certain distance are selected to form the water suction chamber.
And 7: the system respectively extracts data of an impeller, a water suction chamber and a water pumping chamber of the centrifugal pump, calls a three-dimensional modeling software interface to establish a three-dimensional parameterized entity model and a three-dimensional parameterized fluid domain model of the impeller, the water suction chamber and the water pumping chamber, and derives data according to a required data format, and is shown in the attached figures 3-5.
The three-dimensional modeling software used in this example was FreeCAD.
The present embodiment uses a flow rate of 200m3H, lift 45m, rotation speed 2900r/min, efficiency more than or equal to 80.0 percent, and essential
Cavitation margin NPSHr5.0m and a medium density rho 998.7kg/m3The parametric design method and the parametric design system for the centrifugal pump can realize the rapid and accurate parametric design of the impeller, the water suction chamber and the pumping chamber of the centrifugal pump, and obviously improve the design efficiency.
Example 2
Referring to fig. 2, a parametric design system for a centrifugal pump includes a parameter input and output module, a data processing and transmission module, a model building and display module, and a data and user management module, wherein:
the parameter input and output module comprises a parameter input and output unit and a parameter display unit, and has the main functions of inputting and modifying parameters, outputting corresponding parameters, and displaying the format of the parameters and whether the parameters are default values;
the data processing and transmission module comprises a calculation formula, a curve function unit and a data transmission unit, and mainly has the functions of calculating corresponding data according to the calculation formula and the curve function related to the built-in centrifugal pump and transmitting the data among different modules;
the model building and displaying module comprises a three-dimensional model building unit and a model displaying unit, and has the main functions of building and displaying a parameterized model and calling a three-dimensional modeling software internal library function according to the transmitted data to complete a series of parameterized modeling;
the data and user management module comprises a data export unit and a user management unit, and has the main functions of data file management and user data management, and exporting different three-dimensional model data to a folder managed by a user in a specified format.
The high level programming language used in this example was Python and the graphical interface was developed as PyQt 5.
When the system is started, a user inputs original design parameters in the parameter input and output module: flow, lift and rotating speed, and determining whether other default values are modified, and clicking, calculating, calling a data processing and transmitting module to obtain main geometric parameters of the impeller, the pumping chamber and the water suction chamber and displaying the main geometric parameters on an interface.
In an impeller design interface, Bezier control point parameters for controlling an impeller axial surface are input to design an impeller axial surface flow channel and display a change diagram of an overcurrent section area, then control point parameters for controlling a blade shape are input to design a twisted blade, and a model building and display module is clicked to build an impeller model.
And in a design interface of the water suction chamber, determining whether the parameters of the water suction chamber need to be further modified, and if the parameters are determined to be reasonable, clicking a modeling calling model to establish and a display module to establish the water suction chamber model.
And in a pressurized water chamber design interface, determining whether the parameters of the pressurized water chamber need to be further modified, and if the parameters are determined to be reasonable, clicking a modeling calling model to establish and a display module to establish the pressurized water chamber model.
After the process is finished, a designer previews the three-dimensional model of the centrifugal pump after parametric design, confirms the main structure, and calls data and a user management module to set a file export format and save the file position for outputting if the main structure is correct.
In the description herein, references to the description of the term "one embodiment," "some embodiments," "an example," "a specific example," or "some examples," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention, and that variations, modifications, substitutions and alterations can be made in the above embodiments by those of ordinary skill in the art without departing from the principle and spirit of the present invention.
Claims (10)
1. A parametric design method of a centrifugal pump is characterized by comprising the following steps:
s1: initializing structural parameters of the centrifugal pump: setting initial design parameters of the centrifugal pump, and calculating main geometric parameters of an impeller, a water suction chamber and a water pumping chamber in the centrifugal pump through a speed coefficient method and an empirical formula;
s2: extracting main geometric parameters of the centrifugal pump impeller, designing an impeller axial plane and twisted blades based on the main geometric parameters, determining three-dimensional data of the impeller through calculation, and establishing a three-dimensional parameterized model of the impeller and exporting the data by calling a three-dimensional modeling software interface according to the three-dimensional data of the impeller;
s3: extracting data of a water suction chamber and a water pumping chamber of the centrifugal pump, designing the water suction chamber and the water pumping chamber respectively on the basis of the data, determining three-dimensional data of the water suction chamber and the water pumping chamber through calculation, calling a three-dimensional modeling software interface to establish a three-dimensional parameterized model of the water suction chamber and the water pumping chamber, and exporting the data.
2. The parametric design method for centrifugal pump of claim 1, wherein in step S1, the initial design parameters of the centrifugal pump comprise: flow, lift, rotation speed, efficiency, necessary cavitation allowance and medium density, wherein the efficiency, the necessary cavitation allowance and the medium density are in default values if not specified; main geometric parameters of the impeller: the impeller inlet diameter, the impeller outlet width, the blade inlet installation angle, the impeller outlet installation angle, the number of blades, the blade wrap angle and the blade thickness; the main geometrical parameters of the water suction chamber are as follows: the diameter of the inlet of the water suction chamber, the diameter of the outlet of the water suction chamber and the length of the water suction chamber; the main geometric parameters of the water pumping chamber are as follows: base circle diameter, volute width, spacer mounting angle, outlet diameter, diffusion angle and diffuser length.
3. The parametric design method for centrifugal pump as claimed in claim 1, wherein in step S2, based on the main geometric parameters of the impeller, we can use Bezier curves with 5 points and 4 times to design the axial streamline of the impeller, or choose the connection between circular arc and straight line, and display the area variation graph of the flow cross section of the impeller, and adjust the position of the control point to obtain the axial data of the impeller.
4. The parametric design method of the centrifugal pump as claimed in claim 3, wherein according to the main geometric parameters of the impeller and the axial plane data of the impeller, fitting is performed by using a Nurbs curve after a high-order Bezier curve is adopted as a blade profile to calculate and obtain three-dimensional data points of the blade, and on the premise of meeting the blade inlet setting angle, the blade outlet setting angle and the blade wrap angle, the shape of the blade is finely controlled to improve the hydraulic effect of the centrifugal pump.
5. The parametric design method for centrifugal pump of claim 1, wherein in step S3, according to the main geometric parameters of the pumping chamber, 8 sections forming 45 ° with each other are selected on the plane of the pumping chamber, and the default section shape is a trapezoidal section formed by connecting Bezier curve and straight line, so as to combine into a volute of the pumping chamber, and 3 arc sections with different intervals can be selected to combine into a diffuser of the pumping chamber, or an arc, a straight line, a spline curve, or a polynomial curve is selected to mix into the section shape.
6. The parametric design method for the centrifugal pump as claimed in claim 1, wherein the software for establishing the three-dimensional parametric model of the water suction chamber, the impeller and the water pumping chamber of the centrifugal pump is open-source three-dimensional modeling software FreeCAD.
7. The design system of the parameterized design method of a centrifugal pump according to any one of claims 1 to 6, characterized by comprising a parameter input and output module, a data processing and transmission module, a model building and display module and a data and user management module;
the parameter input and output module comprises a parameter input and output unit and a parameter display unit, and is used for inputting and modifying parameters, outputting corresponding parameters, and displaying the format of the parameters and whether the parameters are default values;
the data processing and transmission module comprises a calculation formula, a curve function unit and a data transmission unit, calculates corresponding data according to the calculation formula and the curve function related to the built-in centrifugal pump, and transmits the data among different modules;
the model establishing and displaying module comprises a three-dimensional model establishing unit and a model displaying unit, and is used for calling an internal library function of three-dimensional modeling software according to the transmitted data to complete a series of parameterized modeling for establishing and displaying a parameterized model;
and the data and user management module comprises a data export unit and a user management unit, and exports different three-dimensional model data to a folder managed by the user in a specified format for data file management and user data management.
8. The parametric design system of the centrifugal pump of claim 7, wherein the visual interface is developed by PyQt5 in the parameter input and output module, so as to display the input parameters and the output parameters and modify them.
9. A parametric design system for a centrifugal pump according to claim 7, wherein in the data processing and transmission module, the defined curve function comprises: bezier curve functions, spline interpolation curve functions, polynomial curve functions and Nurbs curve functions.
10. The parametric design system of a centrifugal pump according to claim 7, wherein the model building and displaying module is loaded with an internal library function of three-dimensional modeling software, and the internal library function can be directly called through a Python programming language as required to build and preview a three-dimensional entity model and a three-dimensional fluid domain model.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN116861593A (en) * | 2023-07-12 | 2023-10-10 | 安徽新沪屏蔽泵有限责任公司 | Suction chamber and suction chamber shape modeling method thereof |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN116861593A (en) * | 2023-07-12 | 2023-10-10 | 安徽新沪屏蔽泵有限责任公司 | Suction chamber and suction chamber shape modeling method thereof |
| CN116861593B (en) * | 2023-07-12 | 2023-12-19 | 安徽新沪屏蔽泵有限责任公司 | Suction chamber and suction chamber shape modeling method thereof |
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