Multi-plunger pump performance simulation calculation method

Abstract

The invention provides a multi-plunger pump performance simulation calculation method, which comprises the following steps of: 1, firstly, extracting all fluid domains of plunger pumps, correspondingly segmenting the fluid domains, and modeling and regionally dividing the fluid domains of the multi-plunger pumps; secondly, grid generation setting is conducted on the multi-plunger pump through the sliding valve model; 3, grid generation setting is carried out on an inlet valve fluid domain; fourthly, grid generation setting is conducted on a single plunger cavity outlet valve fluid domain; 5, grid generation setting is conducted on the plunger pump outlet valve fluid domain; 6, setting a connecting pipeline and fluid regions of other regions; step 7, setting an interaction surface grid generation interface; 8, setting a plunger displacement equation and performing a simulation operation process; all fluid domains of the plunger pumps are extracted and segmented, so that all areas of the multiple plunger pumps can be accurately modeled and divided, and the accuracy and comprehensiveness of simulation calculation are ensured.

Description

Technical Field

[0001] The invention relates to a multi-plunger pump performance simulation calculation method, in particular to the technical field of plunger pump performance simulation. Background Art

[0002] The plunger pump has an important impact on the performance of products such as high-pressure cleaners. Its pressure and flow rate directly affect the cleaning performance and energy consumption of the high-pressure cleaner. In order to evaluate its performance, it is usually necessary to calculate its performance during the design phase. There are two methods for calculating the performance of the plunger pump: mathematical formula method and simulation method.

[0003] The calculation method of ordinary mathematical formula is complicated, and the influence of pressure cannot be fully considered when calculating flow, so the precision of the calculation result is not high. Simulation has high accuracy, but for such a complex structure including multiple plungers and multiple valves, the modeling process is very complicated, the workload of meshing is huge, and the shape is complex, which ultimately leads to the failure of the calculation result to converge. Summary of the invention

[0004] Purpose of the invention: To propose a multi-plunger pump performance simulation calculation method to solve the above problems existing in the prior art.

[0005] Technical solution: A multi-plunger pump performance simulation calculation method, including:

[0006] Step 1: First, extract the entire fluid domain of the plunger pump, divide the fluid domain accordingly, and model and divide the fluid domain of multiple plunger pumps;

[0007] Step 2: Use the sliding valve model to set up the grid generation for the multi-piston pump;

[0008] Step 3: Set up mesh generation for the inlet valve fluid domain;

[0009] Step 4: Perform grid generation settings for the fluid domain of a single plunger cavity outlet valve;

[0010] Step 5: Set up mesh generation for the fluid domain of the plunger pump outlet valve;

[0011] Step 6: Set up the connecting pipes and other regional fluid domains;

[0012] Step 7: Set the interactive surface mesh generation interface;

[0013] Step 8: Setting of plunger displacement equation and simulation running process.

[0014] In a further embodiment, step 1, the process of calculating a multi-plunger pump using pumplinx is as follows:

[0015] Extract the entire fluid domain of the plunger pump, convert the fluid domain into an STL file and import it into the pumplinx file;

[0016] The model fluid domain is segmented, and the geometry / grid segmentation and merging module segments the entire model by angle;

[0017] The segmented fluid domain is divided into the inlet valve area, the plunger area, the plunger outlet valve area, the plunger pump outlet valve area, and the connecting pipe area.

[0018] Cut each surface of the module at 45 degrees;

[0019] Set the plunger area. Since the plunger moves up and down, the plunger movement is equivalent to the slide valve movement. Set the plunger according to the setting requirements of the slide valve model in Pumplinx.

[0020] In a further embodiment, step two, in accordance with the setting requirements of setting the sliding valve model, the valve surface, cylinder surface, and valve end face of the plunger are set in sequence, and the axial dead volume area, radial clearance area, and plunger outlet area are set as the valve wall of the sliding valve, and the lowest point of the plunger is set to the valve surface. This is when the plunger is at its lowest point, and the lowest point changes when it moves upward; select all faces of the valve surface, cylinder surface, and valve end face of the plunger in sequence, and then adjust the maximum unit size parameter to 0.008, click to generate a grid, and the grid size and number can be adjusted according to the maximum unit size parameter.

[0021] In a further embodiment, step three, setting the inlet valve fluid domain, setting the inlet valve of the plunger according to the setting of the sliding valve model in pumplinx, setting the valve surface, cylinder surface and valve end face of the inlet valve in sequence. Because the valve has extreme movement positions, two end faces need to be set, the valve sealing position is the lower dead point, and the maximum height position of the valve is the upper dead point; select all faces of the valve surface, cylinder surface and valve end face of the inlet valve in sequence, and then adjust the maximum unit size parameter to 0.008, click to generate a grid, and the grid size and number can be adjusted according to the maximum unit size parameter.

[0022] In a further embodiment, step four, set the fluid domain of a single plunger chamber outlet valve, set the inlet valve of the plunger pump according to the setting of the sliding valve model in pumplinx, and set the valve surface, cylinder surface, and valve end face of the single plunger chamber outlet valve in sequence. Because the valve has extreme positions for up and down movement, two end faces need to be set. The valve sealing position is the lower dead point, and the maximum height position of the valve is the upper dead point. Select all faces of the valve surface, cylinder surface, and valve end face of the single plunger chamber outlet valve in sequence, and then adjust the maximum unit size parameter to 0.008. Click to generate a grid. The grid size and quantity can be adjusted according to the maximum unit size parameter.

[0023] In a further embodiment, step five, setting the fluid domain of the plunger pump outlet valve, setting the inlet valve of the plunger pump according to the setting of the sliding valve model in pumplinx, setting the valve surface, cylinder surface, and valve end face of the plunger pump outlet valve in sequence, because the valve has extreme positions for up and down movement, it is necessary to set two end faces, the valve sealing position is the lower dead point, and the maximum height position of the valve is the upper dead point, select all faces of the valve surface, cylinder surface, and valve end face of a single plunger chamber outlet valve in sequence, and then adjust the maximum unit size parameter to 0.008, click to generate a grid, and the grid size and number can be adjusted according to the maximum unit size parameter.

[0024] In a further embodiment, step six, setting other partial fluid domains, setting connecting pipes and other regional fluid domains as walls, setting interactive surface mesh generation interfaces between pipes and various valves, plungers, inlets, and outlets.

[0025] In a further embodiment, step seven, setting the interaction surface mesh generation interface, selecting the interaction surface between the plunger and the pipeline, the interaction surface between the inlet valve and the pipeline, the interaction surface between the single plunger outlet valve and the pipeline, and the interaction surface between the plunger pump and the outlet valve.

[0026] In a further embodiment, step eight, set the displacement equation of the plunger, then associate the slide valve model with the translational motion, then specify the parameter settings in the translational motion, the motion frequency, the displacement, the motion direction is along the negative direction of the X-axis, set the inlet pressure, the outlet pressure and the fluid medium, and then click to start running in the simulation;

[0027] The displacement of the plunger is obtained by calculating the formula h=r(1-cos(w*time))*tan(a), where h represents the displacement; r represents the plunger radius; w represents the angular velocity; and time represents the time.

[0028] Beneficial effects: The present invention proposes a multi-plunger pump performance simulation calculation method, which can accurately model and divide various regions of the multi-plunger pump (such as the inlet valve region, the plunger region, the outlet valve region, etc.) by extracting and dividing the entire fluid domain of the plunger pump, thereby ensuring the accuracy and comprehensiveness of the simulation calculation;

[0029] Use the sliding valve model to set the mesh generation for each fluid domain of the multi-plunger pump, adjust the mesh size and number according to actual needs, ensure the mesh fineness and calculation efficiency, and thus improve the simulation accuracy and calculation speed;

[0030] By setting the displacement equation of the plunger and associating the slide valve model with the translational motion, the up and down motion process of the plunger can be accurately simulated, reflecting the dynamic characteristics of the plunger pump in actual work, which is helpful for analyzing the performance of the plunger pump;

[0031] Comprehensive fluid domain settings: not only detailed settings for key areas such as plungers, inlet valves, outlet valves, but also settings for fluid domains in connecting pipes and other areas to ensure the integrity and consistency of the entire fluid system and avoid missing or simplifying key parts;

[0032] By setting the interaction surface (mgi), the fluid interaction problem between different areas can be effectively handled, the continuity and stability of the fluid during the flow process can be ensured, and the reliability of the simulation can be improved;

[0033] By setting parameters such as movement frequency, displacement, and movement direction, the movement characteristics of the plunger can be flexibly controlled to adapt to different working conditions and facilitate performance analysis and optimization under multiple working conditions. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] Figure 1 This is a schematic diagram of the plunger of the present invention being configured as a sliding valve as a whole.

[0035] Figure 2 The figure is a schematic diagram of the plunger part of the present invention being configured as a sliding valve.

[0036] Figure 3 This is a schematic diagram of the plunger wall surface of the present invention being configured as a sliding valve.

[0037] Figure 4 It is a schematic diagram of the inlet valve arrangement of the present invention.

[0038] Figure 5 It is a schematic diagram of the outlet valve arrangement of the present invention.

[0039] Figure 6 It is a schematic diagram of the valve surface of the present invention. DETAILED DESCRIPTION

[0040] The applicant believes that existing simulations have high accuracy, but for such a complex structure including multiple plungers and multiple valves, the modeling process is very complicated, the workload of grid division is huge, and the shape is complex, which ultimately leads to the failure of calculation results to converge.

[0041] In order to solve the problems existing in the prior art, the present invention provides a calculation method for a plunger water pump through a multi-plunger pump performance simulation calculation method. It not only takes into account the relationship between pressure and flow and the local geometric structure of the plunger water pump, but also allows the calculation results to converge and accurately calculate the results. Moreover, the performance parameters of a water pump containing multiple plungers can be calculated relatively quickly.

[0042] The present invention will be further described in detail below through embodiments and in conjunction with the accompanying drawings.

[0043] In this application, we propose a multi-piston pump performance simulation calculation method, which includes the following steps:

[0044] Step 1: First, extract the entire fluid domain of the plunger pump, divide the fluid domain accordingly, and model and divide the fluid domain of multiple plunger pumps;

[0045] Step 2: Use the sliding valve model to set up the grid generation for the multi-piston pump;

[0046] Step 3: Set up mesh generation for the inlet valve fluid domain;

[0047] Step 4: Perform grid generation settings for the fluid domain of a single plunger cavity outlet valve;

[0048] Step 5: Set up mesh generation for the fluid domain of the plunger pump outlet valve;

[0049] Step 6: Set up the connecting pipes and other regional fluid domains;

[0050] Step 7: Set the interaction interface (mgi);

[0051] Step 8: Setting of plunger displacement equation and simulation running process.

[0052] Step 1: The process of calculating a multi-piston pump using Pumplinx is as follows:

[0053] Extract the entire fluid domain of the plunger pump, convert the fluid domain into an STL file and import it into the pumplinx file;

[0054] The model fluid domain is divided, and the geometry / grid segmentation and merging (Split / Combine Geometry orGird) module divides the entire model into angles;

[0055] The segmented fluid domain is divided into the inlet valve area, the plunger area, the plunger outlet valve area, the plunger pump outlet valve area, and the connecting pipe area.

[0056] Cut each surface of the module at 45 degrees;

[0057] Set the plunger area. Since the plunger moves up and down, the plunger movement is equivalent to the spool valve movement. Set the plunger according to the setting requirements of the spool valve model in Pumplinx. When extracting the fluid domain of the plunger, the axial dead volume area of ​​the plunger and the radial clearance between the plunger and the plunger cavity should be considered. These areas are filled with fluid.

[0058] Step 2. According to the setting requirements of the sliding valve model, set the valve surface (Valve surface) of the plunger, the cylinder surface (Cylinder surface), and the valve end surface (Valve End surface) in sequence, and set the axial dead volume area, radial clearance area, and plunger outlet area to the valve wall (valve wall) of the sliding valve. Set the lowest point of the plunger to the valve surface (Valve surface). This is the lowest point of the plunger. When moving upward, the lowest point changes; select all the faces of the valve surface (Valve surface) of the plunger, the cylinder surface (Cylinder surface), and the valve end surface (Valve End surface) in sequence, and then adjust the maximum cell size parameter (Maximum Cell Size) to 0.008, click (Create Mesh) to generate the mesh, and the mesh size and number can be adjusted according to the maximum cell size parameter (Maximum Cell Size).

[0059] Step 3. Set the inlet valve fluid domain. Set the inlet valve of the plunger according to the settings of the (spool valve) sliding valve model in Pumplinx, and set the (Valve surface) valve surface, (Cylinder surface) cylinder surface, and (Valve End surface) valve end surface of the inlet valve in sequence. Because the valve has an extreme position of movement, it is necessary to set two (endsurface) end surfaces. The valve sealing position is the lower dead center, and the valve maximum height position is the upper dead center; select all the surfaces of the (Valve surface) valve surface, (Cylinder surface) cylinder surface, and (Valve End surface) valve end surface of the inlet valve in sequence, and then adjust the (Maximum Cell Size) maximum cell size parameter to 0.008, and click (Create Mesh) to generate the mesh. The mesh size and number can be adjusted according to the (Maximum Cell Size) maximum cell size parameter.

[0060] Step 4. Set the fluid domain of a single plunger cavity outlet valve. Set the inlet valve of the plunger pump according to the settings of the (spool valve) sliding valve model in Pumplinx. Set the (Valve surface) valve surface, (Cylinder surface) cylinder surface, and (Valve End surface) valve end surface of the single plunger cavity outlet valve in sequence. Because the valve has an upper and lower limit position, it is necessary to set two (end surface) end surfaces. The valve sealing position is the lower dead center, and the maximum height position of the valve is the upper dead center. Select all the surfaces of the (Valve surface) valve surface, (Cylinder surface) cylinder surface, and (Valve End surface) valve end surface of the single plunger cavity outlet valve in sequence, and then adjust the (Maximum Cell Size) maximum cell size parameter to 0.008. Click (Create Mesh) to generate the mesh. The mesh size and number can be adjusted according to the (Maximum Cell Size) maximum cell size parameter.

[0061] Step 5. Set the fluid domain of the plunger pump outlet valve. Set the inlet valve of the plunger pump according to the settings of the (spoolvalve) sliding valve model in Pumplinx. Set the (Valve surface) valve surface, (Cylindersurface) cylinder surface, and (Valve End surface) valve end surface of the plunger pump outlet valve in sequence. Because the valve has extreme positions for up and down movement, it is necessary to set two (end surface) end surfaces. The valve sealing position is the lower dead center, and the maximum height position of the valve is the upper dead center. Select all the surfaces of the (Valve surface) valve surface, (Cylinder surface) cylinder surface, and (Valve Endsurface) valve end surface of a single plunger cavity outlet valve in sequence, and then adjust the (Maximum Cell Size) maximum cell size parameter to 0.008. Click (Create Mesh) to generate the mesh. The mesh size and number can be adjusted according to the (Maximum Cell Size) maximum cell size parameter.

[0062] Step 6. Set up other fluid domains, set the connecting pipes and other regional fluid domains as walls (wall), and set the interaction surfaces (mgi) between the pipes and each valve, plunger, inlet, and outlet.

[0063] Step 7. Set the interaction surface (mgi), select the interaction surface between the plunger and the pipeline, the interaction surface between the inlet valve and the pipeline, the interaction surface between the single plunger outlet valve and the pipeline, and the interaction surface between the plunger pump and the outlet valve.

[0064] Step 8. Set the displacement equation of the plunger, then associate the spool valve model with the translation motion, and then specify the parameter settings in the translation motion, the motion frequency, displacement, and the movement direction along the negative direction of the X axis. Set the inlet pressure, outlet pressure and fluid medium, and then click Strat in the simulation to start running;

[0065] The displacement of the plunger is obtained by calculating the formula h=r(1-cos(w*time))*tan(a), where h represents the displacement; r represents the plunger radius; w represents the angular velocity; and time represents the time.

[0066] 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 multi-piston pump performance simulation calculation method, characterized in that: include: Step 1: First, extract the entire fluid domain of the plunger pump, divide the fluid domain accordingly, and model and divide the fluid domain of multiple plunger pumps; Step 2: Use the sliding valve model to set up the grid generation for the multi-piston pump; Step 3: Set up mesh generation for the inlet valve fluid domain; Step 4: Perform grid generation settings for the fluid domain of a single plunger cavity outlet valve; Step 5: Set up mesh generation for the fluid domain of the plunger pump outlet valve; Step 6: Set up the connecting pipes and other regional fluid domains; Step 7: Set up the interactive surface mesh generation interface; Step 8: Plunger displacement equation setting and simulation running process.

2. A multi-plunger pump performance simulation calculation method according to claim 1, characterized in that: Step 1: The process of calculating a multi-piston pump using Pumplinx is as follows: Extract the entire fluid domain of the plunger pump, convert the fluid domain into an STL file and import it into the pumplinx file; The model fluid domain is segmented, and the geometry / grid segmentation and merging module segments the entire model by angle; The segmented fluid domain is divided into the inlet valve area, the plunger area, the plunger outlet valve area, the plunger pump outlet valve area, and the connecting pipe area. Cut each surface of the module at 45 degrees; Set the plunger area. Since the plunger moves up and down, the plunger movement is equivalent to the slide valve movement. Set the plunger according to the setting requirements of the slide valve model in Pumplinx.

3. A multi-plunger pump performance simulation calculation method according to claim 1, characterized in that: Step 2. According to the setting requirements of the sliding valve model, set the valve surface, cylinder surface, and valve end face of the plunger in sequence, and set the axial dead volume area, radial clearance area, and plunger outlet area to the valve wall of the sliding valve. Set the lowest point of the plunger to the valve surface. This is the lowest point of the plunger. When it moves upward, the lowest point changes; select all faces of the valve surface, cylinder surface, and valve end face of the plunger in sequence, and then adjust the maximum unit size parameter to 0.

008. Click Generate Mesh. The mesh size and number can be adjusted according to the maximum unit size parameter.

4. A multi-plunger pump performance simulation calculation method according to claim 1, characterized in that: Step 3. Set the inlet valve fluid domain. Set the inlet valve of the plunger according to the settings of the sliding valve model in Pumplinx. Set the valve surface, cylinder surface and valve end face of the inlet valve in sequence. Because the valve has extreme movement positions, two end faces need to be set. The valve sealing position is the lower dead center, and the maximum height position of the valve is the upper dead center. Select all faces of the valve surface, cylinder surface and valve end face of the inlet valve in sequence, and then adjust the maximum unit size parameter to 0.

008. Click Generate Mesh. The mesh size and number can be adjusted according to the maximum unit size parameter.

5. A multi-plunger pump performance simulation calculation method according to claim 1, characterized in that: Step 4. Set the fluid domain of a single plunger cavity outlet valve. Set the inlet valve of the plunger pump according to the settings of the sliding valve model in Pumplinx. Set the valve surface, cylinder surface, and valve end face of the single plunger cavity outlet valve in sequence. Because the valve has extreme positions for up and down movement, two end faces need to be set. The valve sealing position is the lower dead center, and the maximum height position of the valve is the upper dead center. Select all faces of the valve surface, cylinder surface, and valve end face of the single plunger cavity outlet valve in sequence, and then adjust the maximum unit size parameter to 0.

008. Click Generate Mesh. The mesh size and number can be adjusted according to the maximum unit size parameter.

6. A multi-plunger pump performance simulation calculation method according to claim 1, characterized in that: Step 5. Set the fluid domain of the plunger pump outlet valve. Set the inlet valve of the plunger pump according to the settings of the sliding valve model in Pumplinx. Set the valve surface, cylinder surface and valve end face of the plunger pump outlet valve in sequence. Because the valve has extreme positions for up and down movement, two end faces need to be set. The valve sealing position is the lower dead center, and the maximum height position of the valve is the upper dead center. Select all faces of the valve surface, cylinder surface and valve end face of a single plunger cavity outlet valve in sequence, and then adjust the maximum unit size parameter to 0.

008. Click Generate Mesh. The mesh size and number can be adjusted according to the maximum unit size parameter.

7. A multi-plunger pump performance simulation calculation method according to claim 1, characterized in that: Step 6. Set up other fluid domains, set the connecting pipes and other regional fluid domains as walls, and set up the mesh generation interface for the interaction surface between the pipes and each valve, plunger, inlet, and outlet.

8. A multi-plunger pump performance simulation calculation method according to claim 1, characterized in that: Step 7. Set up the interaction surface mesh generation interface, select the interaction surface between the plunger and the pipeline, the interaction surface between the inlet valve and the pipeline, the interaction surface between the single plunger outlet valve and the pipeline, and the interaction surface between the plunger pump and the outlet valve.

9. A multi-plunger pump performance simulation calculation method according to claim 1, characterized in that: Step 8. Set the displacement equation of the plunger, then associate the slide valve model with the translational motion, and then specify the parameter settings in the translational motion, the movement frequency, displacement, and the movement direction along the negative direction of the X-axis. Set the inlet pressure, outlet pressure and fluid medium, and then click Start Run in the simulation; The displacement of the plunger is obtained by calculating the formula h=r(1-cos(w*time))*tan(a), where h represents the displacement; r represents the plunger radius; w represents the angular velocity; and time represents the time.

Images