Piston type air pump performance simulation method

Abstract

The invention provides a piston type air pump performance simulation method. The method comprises the steps that firstly, a fluid domain is extracted and imported into a model; step 2, segmenting and combining the model; 3, dividing grids for the first-stage piston region and the second-stage piston region; step 4, dividing grids for the first-stage inlet valve area and the second-stage inlet valve area; 5, dividing grids for a secondary outlet valve area; step 6, dividing grids for fluid domains of other regions; 7, setting and selecting an interaction surface and a boundary condition; the performance of the piston type air pump is calculated by adopting pumplinx, various performance indexes of the air pump under different working conditions can be accurately evaluated, flow, pressure and efficiency key parameters of the air pump can be accurately predicted, and a reliable basis is provided for design, optimization and performance improvement of the air pump.

Description

Technical Field

[0001] The invention relates to a piston air pump performance simulation method, in particular to the technical field of piston pump performance simulation. Background Art

[0002] In today's industrial production and scientific research fields, air pumps, as an important power equipment, are widely used in various scenarios, such as pneumatic tools, gas transportation, industrial automation, etc.; among them, piston air pumps are highly favored due to their simple structure, reliable operation, and stable output pressure.

[0003] However, traditional piston air pump performance research often relies on actual experimental testing, which is not only costly, time-consuming and laborious, but also limited by experimental conditions and environment, making it difficult to conduct a comprehensive and accurate evaluation of the performance of air pumps under various complex working conditions. In addition, actual experimental testing is also unable to monitor and analyze the changes in key parameters such as flow field, pressure and temperature inside the air pump in real time, which makes it very difficult to deeply understand the working mechanism of the air pump and optimize its performance.

[0004] There are two methods for calculating the performance of the piston: mathematical formula method and simulation method. The ordinary mathematical formula calculation method is complicated and the accuracy of the calculation result is not high. The empirical formula has its applicability. Simulation has high accuracy, but for this kind of piston air pump, the movement process is complicated, the actual modeling process is also complicated, the workload of grid division is huge, and the calculation results cannot converge. Therefore, it is necessary to find an efficient and accurate simulation calculation method.

[0005] With the rapid development of computer technology, numerical simulation technology has gradually become an important means to study the performance of piston air pumps. By establishing accurate physical models and mathematical equations and using computers for numerical calculations and simulations, the working process of piston air pumps can be comprehensively and carefully analyzed and studied in a virtual environment. The numerical simulation method can quickly and efficiently obtain the performance parameters of air pumps under various working conditions, such as flow, pressure, power, etc., without being restricted by experimental conditions, providing important theoretical basis and technical support for the design, optimization and fault diagnosis of air pumps.

[0006] Therefore, developing a piston air pump performance simulation method based on numerical simulation technology has important theoretical significance and practical application value. It can help engineers better understand the working mechanism of air pumps, optimize their structure and parameters, improve their performance and reliability, reduce R&D costs and cycles, and promote the continuous development and progress of piston air pump technology. Summary of the invention

[0007] Purpose of the invention: To propose a piston air pump performance simulation method to solve the above problems existing in the prior art.

[0008] Technical solution: A piston air pump performance simulation method, comprising:

[0009] Step 1: extract the fluid domain and import it into the model;

[0010] Step 2: Split and merge the models;

[0011] Step 3, dividing the primary and secondary piston areas into grids;

[0012] Step 4, dividing the primary and secondary inlet valve areas into grids;

[0013] Step 5, dividing the secondary outlet valve area into grids;

[0014] Step 6, mesh the fluid domains in other regions;

[0015] Step 7: Set the interaction surface, boundary conditions and make selections.

[0016] In a further embodiment, step one, the steps of using Pumplinx to calculate the piston air pump are as follows: first extract the complete fluid domain of the piston air pump, convert the entire fluid domain into an STL file and import it into the Pumplinx file; use import / export geometry or mesh to import the model in STL format.

[0017] In a further embodiment, in step 2, the model is segmented and merged, and the geometry / grid segmentation and merging module then segments the entire model into geometric surfaces according to angles; the segmented fluid domain geometric surfaces are divided into a primary inlet valve area, a primary outlet valve area, a primary piston area, a secondary piston area, a secondary inlet valve area, a secondary outlet valve area, a primary air inlet area, a primary to secondary connecting pipe area, and a secondary air outlet area according to regions, and are respectively merged into separate geometric regions, and each part is named;

[0018] In a further embodiment, step three, gridding the primary piston region: the piston motion is equivalent to the slide valve motion, and the primary piston region is set according to the setting requirements of the slide valve model grid in Pumplinx.

[0019] According to the setting requirements of setting the mesh of the sliding valve model, according to the previously divided and merged fluid domain, set the valve surface, cylinder surface, and valve end face of the piston in sequence, and set the axial dead volume area and the piston outlet area as the valvewall of the sliding valve, and set the lowest point of the piston to the valve surface. This is the lowest point of the piston. When it moves upward, the lowest point changes; select the valve surface, cylinder surface, and valve end face of the piston in sequence, and then click the valve mesh generator module. After entering, select the corresponding surface, and then select the sliding valve as the valve type. The movement direction is the negative direction of the X-axis, that is, select the movement direction, set the minimum gap, the maximum stroke of the piston movement, and then click Generate sliding valve mesh to generate a primary piston mesh;

[0020] Secondary piston area meshing: Generate a mesh for the divided and merged secondary piston area in the same way as the primary piston area meshing.

[0021] In a further embodiment, step 4, the first-level inlet valve area is divided into grids: click the valve grid generator module, select the corresponding surface according to the previously segmented and merged geometric surface, then select the circumferential valve as the valve type, select the previously segmented and merged valve surface, cylinder surface, and all the valve end surfaces in turn, set the rotor rotation center point, rotor rotation axis, valve reference point, set the minimum clearance, the maximum stroke of the piston movement, and then click Generate Circumferential Valve Grid to generate the first-level piston inlet valve grid;

[0022] Grid division of the first-stage outlet valve area: generate a grid for the first-stage outlet valve area that has been divided and merged in the same way as the grid division of the first-stage inlet valve area;

[0023] Meshing of the secondary inlet valve area: Generate a mesh for the divided and merged secondary inlet valve area in the same way as meshing of the primary inlet valve area.

[0024] In a further embodiment, step five, gridding the secondary outlet valve region: generating a grid for the divided and merged secondary outlet valve region in the same manner as gridding the primary outlet valve region.

[0025] In a further embodiment, step six, meshing the fluid domains in other regions: mesh the primary air inlet region, the primary to secondary connecting pipe region, and the secondary air outlet region according to a general mesh module, set the mesh angle, maximum mesh unit, and minimum mesh unit, and click Generate Mesh after the settings are completed.

[0026] In a further embodiment, step seven, setting the interaction surface: after the meshing is completed, the surface where the air interacts with the pipeline and each valve, piston, inlet, and outlet is set as the interaction surface;

[0027] Boundary condition setting and selection: select air as the medium, add the Flow cavitation module and the translation of the dynamics module; then associate the slide valve with the translation, and set the inlet pressure and outlet pressure; then specify the parameter settings in the translation: movement frequency, displacement, and movement direction; when setting the displacement, the displacement of the plunger is obtained according to the calculation formula h=e-ecos(w*t), where h represents the displacement; e represents the eccentricity of the eccentric shaft in the air pump; w represents the angular velocity; t represents time; specify the displacement change curve over time; then click to start running in the simulation.

[0028] Beneficial effects: The present invention proposes a piston air pump performance simulation method. By using Pumplinx to calculate the performance of the piston air pump, the various performance indicators of the air pump under different working conditions can be accurately evaluated, and the key parameters of the air pump flow, pressure, and efficiency can be accurately predicted, providing a reliable basis for the design, optimization, and performance improvement of the air pump.

[0029] Compared with traditional mathematical or common simulation calculation methods, the calculation method based on Pumplinx is more accurate and comprehensive, and can take into account the complexity of piston motion, the characteristics of gas flow, and the influence of various boundary conditions, so as to obtain performance results that are more in line with the actual situation; it helps to avoid performance losses caused by unreasonable design and improve the overall performance and reliability of air pumps;

[0030] In addition, the calculation method of the invention patent is highly efficient and convenient, and can quickly perform a large number of calculations and simulations, saving R&D time and costs. At the same time, through the analysis and optimization of the calculation results, it can timely discover problems and potential risks in the air pump design, and take corresponding improvement measures to further improve the performance and quality of the air pump.

[0031] In short, the calculation method of the patent of this invention provides an advanced, accurate and efficient tool for the performance research and development of piston air pumps, which is of great significance and value in promoting technological progress and product upgrades in the air pump industry. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] Figure 1 This is a schematic diagram of the plug of the present invention being configured as a sliding valve as a whole.

[0033] Figure 2 This is a schematic diagram of the piston portion of the present invention being configured as a sliding valve.

[0034] Figure 3 This is a schematic diagram of the piston wall surface of the present invention being configured as a sliding valve. DETAILED DESCRIPTION

[0035] The applicant believes that traditional piston air pump performance research often relies on actual experimental testing. This method is not only costly, time-consuming and labor-intensive, but also limited by experimental conditions and environment, making it difficult to conduct a comprehensive and accurate evaluation of the air pump performance under various complex working conditions.

[0036] In order to solve the problems existing in the prior art, the present invention adopts a piston air pump performance simulation method. By adopting Pumplinx to calculate the performance of the piston air pump, the various performance indicators of the air pump under different working conditions can be accurately evaluated, and the key parameters of the air pump such as flow, pressure, and efficiency can be accurately predicted, providing a reliable basis for the design, optimization and performance improvement of the air pump.

[0037] The present invention will be further described in detail below through embodiments and in conjunction with the accompanying drawings.

[0038] In this application, we propose a piston air pump performance simulation method, comprising the following steps:

[0039] Step 1: extract the fluid domain and import it into the model;

[0040] Step 2: Split and merge the models;

[0041] Step 3, dividing the primary and secondary piston areas into grids;

[0042] Step 4, dividing the primary and secondary inlet valve areas into grids;

[0043] Step 5, dividing the secondary outlet valve area into grids;

[0044] Step 6, mesh the fluid domains in other regions;

[0045] Step 7: Set the interaction surface, boundary conditions and make selections.

[0046] Step 1: The steps for calculating the piston air pump using Pumplinx are as follows: first, extract the complete fluid domain of the piston air pump, convert the entire fluid domain into an STL file and import it into the Pumplinx file; use import / export geometry or mesh to import the model in STL format.

[0047] Step 2: Split and merge the model. The Split / CombineGeometry or Gird module then splits the entire model into geometric surfaces according to angles; divides the fluid domain geometric surfaces into the first-level inlet valve area, the first-level outlet valve area, the first-level piston area, the second-level piston area, the second-level inlet valve area, the second-level outlet valve area, the first-level air inlet area, the first-level to second-level connecting pipe area and the second-level air outlet area, and merges them into separate geometric areas, and names each part;

[0048] Step 3: Grid the primary piston area: Since the piston moves up and down and is provided with a leather cup, there is no leakage in the radial direction between the piston and the piston wall. The piston movement is equivalent to the spool valve movement, and the primary piston area is set according to the setting requirements of the spool valve model in Pumplinx. When extracting the fluid domain of the piston, the axial dead volume area of ​​the piston should be considered, and these areas are filled with fluid.

[0049] According to the setting requirements of setting the mesh of the spool valve model, according to the fluid domain that has been divided and merged before, set the valve surface, cylinder surface, and valve end surface of the piston (Valve surface, Cylinder surface, Valve End surface) in sequence according to the setting requirements shown in the figure, and set the axial dead volume area and the piston outlet area as the valve wall of the spool valve, and set the lowest point of the piston to the valve surface (Valve surface). This is the lowest point of the piston. When it moves upward, the lowest point changes; select the valve surface, cylinder surface, and valve end surface of the piston (Valve surface, Cylinder surface, Valve End surface) all faces in sequence, and then click the valve mesh generator (Valve Template Mesher) module, select the corresponding surface after entering, and then select the spool valve (SpoolValve) for the valve type (Valve Type), and the movement direction (Opening Direction) is along the negative direction of the X-axis, that is, select the movement direction, set the minimum gap (Minimum Gap Size), the maximum stroke of the piston movement (Maximum Displacement), and then click the Build Spool Valve mesh (Build Spool Valve). Mesh) generates the first-level piston mesh;

[0050] Secondary piston area meshing: Generate a mesh for the divided and merged secondary piston area in the same way as the primary piston area meshing.

[0051] Step 4. Grid the first-level inlet valve area: Click the Valve Template Mesher module, select the corresponding surface according to the previously divided and merged geometric surface, then select the circumferential valve in the valve type, select the valve surface, cylinder surface, valve end surface (Valve surface, Cylinder surface, Valve End surface) all the previously divided and merged surfaces in turn, set the rotor rotation center (Center of Rotation), rotor rotation axis (Rotational Axis Vector), valve reference point (Reference point), set the minimum gap (Minimum Gap Size), the maximum stroke of the piston movement (Maximum Displacement), and then click Build Circumferential Valve Mesh to generate the first-level piston inlet valve mesh;

[0052] Grid division of the first-stage outlet valve area: generate a grid for the first-stage outlet valve area that has been divided and merged in the same way as the grid division of the first-stage inlet valve area;

[0053] Meshing of the secondary inlet valve area: Generate a mesh for the divided and merged secondary inlet valve area in the same way as meshing of the primary inlet valve area.

[0054] Step 5, meshing the secondary outlet valve region: generating a mesh for the divided and merged secondary outlet valve region in the same manner as meshing the primary outlet valve region.

[0055] Step 6. Mesh the fluid domain in other areas: mesh the first-level air inlet area, the first-level to second-level connecting pipe area, and the second-level air outlet area according to the general mesher module, set the critical edge angle, maximum cell size, and minimum cell size, and click Create Mesh after the settings are completed.

[0056] Step 7, setting the interaction surface: after the mesh division is completed, the surface where the air interacts with the pipeline and each valve, piston, inlet, and outlet is set as the interaction surface (mgi);

[0057] Boundary condition setting and selection: Select air as the medium, add the cavitation module (Cavitation) in Flow, and the translation (Translation) in the dynamics module (Dynamics); then associate the spool valve (Spool Valve) with the translation (Translation), and then set the inlet pressure and outlet pressure; then specify the parameter settings in the translation (Translation): motion frequency (Motion Frequency), displacement (Displacement), movement direction (MovementDirection); when setting the displacement, the displacement of the plunger is obtained according to the calculation formula h=e-ecos(w*t), where h represents the displacement; e represents the eccentricity of the eccentric shaft in the air pump; w represents the angular velocity; t represents time; specify the displacement change curve over time; then click (Strat) in the (Simulation) simulation to start running.

[0058] As described above, although the present invention has been shown and described with reference to specific preferred embodiments, it should not be construed as limiting the present invention itself. Various changes may be made to it in form and detail without departing from the spirit and scope of the present invention as defined in the appended claims.

Claims

1. A piston air pump performance simulation method, characterized in that: include: Step 1: extract the fluid domain and import it into the model; Step 2: Split and merge the models; Step 3, dividing the primary and secondary piston areas into grids; Step 4, dividing the primary and secondary inlet valve areas into grids; Step 5, dividing the secondary outlet valve area into grids; Step 6, mesh the fluid domains in other regions; Step 7: Set the interaction surface, boundary conditions and make selections.

2. A piston air pump performance simulation method according to claim 1, characterized in that: Step 1: The steps to calculate the piston air pump using Pumplinx are as follows: first extract the complete fluid domain of the piston air pump, convert the entire fluid domain into an STL file and import it into the Pumplinx file; use import / export geometry or mesh to import the model in STL format.

3. A piston air pump performance simulation method according to claim 1, characterized in that: Step 2: Divide and merge the model. The geometry / mesh segmentation and merging module then divides the entire model into geometric surfaces by angle; divides the divided fluid domain geometric surfaces into the first-level inlet valve area, the first-level outlet valve area, the first-level piston area, the second-level piston area, the second-level inlet valve area, the second-level outlet valve area, the first-level air inlet area, the first-level to second-level connecting pipe area and the second-level air outlet area, and merges them into separate geometric areas, and names each part.

4. A piston air pump performance simulation method according to claim 1, characterized in that: Step 3: Grid the primary piston area: Equivalent the piston motion to the slide valve motion, and set the primary piston area according to the setting requirements of the slide valve model grid in Pumplinx; According to the setting requirements of setting the mesh of the sliding valve model, according to the previously divided and merged fluid domain, set the valve surface, cylinder surface, and valve end face of the piston in sequence, and set the axial dead volume area and the piston outlet area as the valvewall of the sliding valve, and set the lowest point of the piston to the valve surface. This is the lowest point of the piston. When it moves upward, the lowest point changes; select the valve surface, cylinder surface, and valve end face of the piston in sequence, and then click the valve mesh generator module. After entering, select the corresponding surface, and then select the sliding valve as the valve type. The movement direction is the negative direction of the X-axis, that is, select the movement direction, set the minimum gap, the maximum stroke of the piston movement, and then click Generate sliding valve mesh to generate a primary piston mesh; Secondary piston area meshing: Generate a mesh for the divided and merged secondary piston area in the same way as the primary piston area meshing.

5. A piston air pump performance simulation method according to claim 1, characterized in that: Step 4: Grid the primary inlet valve area: Click the valve grid generator module, select the corresponding surface according to the previously segmented and merged geometric surface, then select the circumferential valve as the valve type, select the previously segmented and merged valve surface, cylinder surface, and all the valve end surfaces in turn, set the rotor rotation center point, rotor rotation axis, valve reference point, set the minimum clearance, the maximum stroke of the piston movement, and then click Generate Circumferential Valve Grid to generate the primary piston inlet valve grid; Grid division of the first-stage outlet valve area: generate a grid for the first-stage outlet valve area that has been divided and merged in the same way as the grid division of the first-stage inlet valve area; Meshing of the secondary inlet valve area: Generate a mesh for the divided and merged secondary inlet valve area in the same way as meshing of the primary inlet valve area.

6. A piston air pump performance simulation method according to claim 1, characterized in that: Step 5, meshing the secondary outlet valve region: generating a mesh for the divided and merged secondary outlet valve region in the same manner as meshing the primary outlet valve region.

7. A piston air pump performance simulation method according to claim 1, characterized in that: Step 6. Grid the fluid domain in other areas: grid the first-level air inlet area, the first-level to second-level connecting pipe area, and the second-level air outlet area according to the general grid module, set the grid angle, maximum grid unit, and minimum grid unit. After the settings are completed, click Generate Grid.

8. A piston air pump performance simulation method according to claim 1, characterized in that: Step 7, setting the interaction surface: after the mesh division is completed, the surface where the air interacts with the pipeline and each valve, piston, inlet, and outlet is set as the interaction surface; Boundary condition setting and selection: select air as the medium, add the Flow cavitation module and the translation of the dynamics module; then associate the slide valve with the translation, and set the inlet pressure and outlet pressure; then specify the parameter settings in the translation: movement frequency, displacement, and movement direction; when setting the displacement, the displacement of the plunger is obtained according to the calculation formula h=e-ecos(w*t), where h represents the displacement; e represents the eccentricity of the eccentric shaft in the air pump; w represents the angular velocity; t represents time; specify the displacement change curve over time; then click to start running in the simulation.

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