KR101629005B1 - optimal design method of single channel pump impeller, single channel pump impeller and centrifugal pump designed by the method - Google Patents

optimal design method of single channel pump impeller, single channel pump impeller and centrifugal pump designed by the method Download PDF

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KR101629005B1
KR101629005B1 KR1020150043524A KR20150043524A KR101629005B1 KR 101629005 B1 KR101629005 B1 KR 101629005B1 KR 1020150043524 A KR1020150043524 A KR 1020150043524A KR 20150043524 A KR20150043524 A KR 20150043524A KR 101629005 B1 KR101629005 B1 KR 101629005B1
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impeller
design
point
pump impeller
single flow
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Korean (ko)
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김진혁
최영석
김준형
조보민
이경용
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한국생산기술연구원
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    • G06F17/5086—
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
    • F04D29/00—Details, component parts, or accessories
    • F04D29/18—Rotors
    • F04D29/22—Rotors specially for centrifugal pumps
    • G06F17/5018—

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  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Structures Of Non-Positive Displacement Pumps (AREA)

Abstract

According to the present invention, an optimized design method of an impeller of a single channel pump, capable of improving a hydromechanical performance. According to one embodiment of the present invention, the method comprises: a step of selecting design variables and determining a target function in consideration of a shape of an impeller of a single channel pump; a step of selecting design area by determining an upper and a lower limit value of the design variables; a step of combining the design variables by using curve fitting in a selected design area; a step of performing a numerical analysis in the selected design area; and a step of searching for an optimal point in the design area through a numerical analysis result.

Description

[0001] The present invention relates to an optimized design method of a single flow pump impeller, a single flow pump impeller and a centrifugal pump designed thereby, and a single channel pump impeller and a centrifugal pump,

The present invention relates to a method for optimizing a single flow pump impeller and a single flow pump impeller and a centrifugal pump designed thereby.

In general, pumps are used to transport unfiltered sewage, sludge, wastewater, raw water, food waste, pulp sludge, and the like. Often, the pump for transferring the sludge or the like is also referred to as a sludge pump. Pumps for transporting such sludge and the like are widely used in water treatment plants and various industrial fields.

Such a sludge pump is used for the purpose of treating living and industrial wastewater. Unlike a general underwater pump, it is necessary to move a fluid including a foreign substance. Therefore, it is possible to prevent performance degradation, failure or breakage Design characteristics are required

However, since the conventional submersible pump pumps the conveyed material containing the abrasive material, local impregnation of the impeller may occur, and vibration and noise of the entire pump may be generated due to impeller wear during long operation.

One embodiment of the present invention is to provide an optimized design method of a single flow pump impeller capable of improving hydrodynamic performance, and a single flow pump impeller and a centrifugal pump designed thereby.

According to an aspect of the present invention, there is provided a method for selecting a design parameter and an objective function in consideration of a shape of a single flow pump impeller, a design region selection step of determining upper and lower limits of the design parameter, And searching for an optimum point in the design domain through the numerical analysis step and the result of the numerical analysis in the selected design area, wherein the design parameter is determined according to the angle of the single flow impeller Sectional flow areas P1 and P2 of the single flow path impeller which can be varied,

Figure 112016014854351-pat00020
The present invention provides a method of optimizing a single-channel pump impeller.
In this case, η = pump efficiency, ρ = density, g = gravitational acceleration, H = head, Q = volume flow rate, τ = torque, ω = angular acceleration, and ηm = motor efficiency.

In this case, the step of searching for an optimum point in the design domain through the numerical analysis result may further include a step of comparing whether the optimum point is valid.

At this time, the point where the smallest cross-sectional area of the inner flow path of the single flow path impeller starts, the impeller angle is 0 degree, the largest point is 360 degrees, the impeller angle is the transverse axis, , And P1 and P2 may be arbitrary points between the horizontal axis and the vertical axis.

delete

At this time, the cross-sectional area of the inner flow path is 130 mm 2 at an angle of the impeller of 0 to 70 degrees, 3800 mm 2 at 360 degrees, P1 at 160 degrees, and P2 at 270 degrees.

In this case, in the design region selection step of determining the upper and lower limit values of the design parameters, P1 is 130 mm 2 or more and 2330 mm 2 And P2 is 1600 mm < 2 > Not more than, 3800 mm 2 ≪ / RTI >

At this time, the curve fitting may include generating a Bezier curve represented by a start point, an end point, and two control points.

Wherein the starting point is a point when the angle of the impeller is 70 degrees and the ending point is a point when the angle of the impeller is 360 degrees and the two control points are P1 and P2, And generating a Bezier curve represented by the start point, the end point, and the two control points.

At this time, the numerical analysis step in the selected design area includes a step of determining a plurality of experimental points through Latin hypercube sampling in the selected design area, and a step of calculating a three-dimensional RANS (Reynolds-averaged Navier-Stokes) And obtaining the value of the objective function through analysis.

At this time, the step of searching for the optimum point in the design domain through the result of the numerical analysis is performed by constructing a radial basis neural network model and then using the sequential quadratic programming (SQP) And a step of determining the number

At this time, after constructing the neural network model, in the step of determining the optimal design parameter value from the neural network technique using SQP, P1 is 1138 mm 2 P2 is 1739 mm < 2 > Lt; / RTI >

The comparing step may include comparing the predicted objective function value by the neural network technique with the objective function value obtained through the numerical analysis.

According to another aspect of the present invention, there is provided a single flow pump impeller including an impeller designed by the above-described optimum design method for a single flow pump impeller.

According to another aspect of the present invention, there is provided a single-flow pump comprising: the single-flow pump impeller described above, a drive shaft formed on one surface of the impeller and operated by a drive motor, and a suction portion for receiving a part of the impeller and the drive shaft, And a casing provided with a discharge portion.

The single flow pump impeller designed according to the optimization design method of the single flow pump impeller according to the embodiment of the present invention is formed such that the inlet port and the outlet port are curved so that the sludge having viscosity such as manure, wastewater, dirt, And can be easily pumped.

The single channel pump impeller and the centrifugal pump according to an embodiment of the present invention can easily pass through bulky solids, thereby preventing failure and damage due to clogging, and having high pump efficiency.

The optimized design method of a single flow pump impeller according to an embodiment of the present invention can improve pump efficiency and stability against internal flow through numerical optimization.

FIG. 1 is a flowchart illustrating an optimum design method of a single flow pump impeller according to an embodiment of the present invention.
2 is a cross-sectional view of a centrifugal pump including a single flow pump impeller designed by a method for optimizing a single flow pump impeller according to an embodiment of the present invention.
3 is a perspective view illustrating a single flow pump impeller designed by a method for optimizing a single flow pump impeller according to an embodiment of the present invention.
4 is a perspective view illustrating an inner passage of a single flow pump impeller designed according to an optimum design method of a single flow pump impeller according to an embodiment of the present invention.
5 is a graph showing the volume distribution of a basic model impeller in a method of optimizing a single flow pump impeller according to an embodiment of the present invention.
FIG. 6 is a graph showing design variables, design areas, and Bezier curves in an optimal design method for a single flow pump impeller according to an embodiment of the present invention.
7 is a graph showing twelve experimental points through Latin hypercube sampling in a method of optimizing a single flow pump impeller according to an embodiment of the present invention.
FIG. 8 is a graph illustrating an optimal point predicted through a neural network technique (RBNN) in an optimum design method of a single flow pump impeller according to an embodiment of the present invention.
9 is a graph illustrating sensitivity analysis of design parameters of an objective function in a method of optimizing a single flow pump impeller according to an embodiment of the present invention.
FIG. 10 is a graph showing the lift of a basic model and an optimal model through a numerical analysis and a performance test in an optimum design method of a single flow pump impeller according to an embodiment of the present invention.
11 is a graph showing efficiency in a basic model and an optimal model through numerical analysis and performance test in a method of optimizing a single flow pump impeller according to an embodiment of the present invention.
FIG. 12 is a graph illustrating the flow velocity distribution of an impeller according to an impeller angle in an optimal design method of a single flow pump impeller according to an embodiment of the present invention.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings, which will be readily apparent to those skilled in the art to which the present invention pertains. The present invention may be embodied in many different forms and is not limited to the embodiments described herein. In order to clearly illustrate the present invention, parts not related to the description are omitted, and the same or similar components are denoted by the same reference numerals throughout the specification.

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, a method for optimizing a single flow pump impeller according to an embodiment of the present invention and a single flow pump impeller and a centrifugal pump designed thereby will be described in detail with reference to the drawings.

In the present invention, sludge having viscosity such as manure, wastewater, dirt, and solids is referred to as fluid.

FIG. 1 is a flowchart illustrating an optimum design method of a single flow pump impeller according to an embodiment of the present invention.

Referring to FIG. 1, an optimal design method of a single flow pump impeller according to an embodiment of the present invention includes design parameter selection and objective function determination step (S10) in consideration of the shape of a single flow pump impeller, (S30) of combining the design parameters using the cover fitting in the selected design area, a numerical analysis step (S40) in the selected design area, and a numerical analysis result to determine the design area (S50) of searching for an optimum point in the search range.

The optimized design method of a single flow pump impeller according to an embodiment of the present invention can optimize the pump efficiency when the centrifugal pump is operated.

2 is a cross-sectional view of a centrifugal pump including a single flow pump impeller designed by a method for optimizing a single flow pump impeller according to an embodiment of the present invention. 3 is a perspective view illustrating a single flow pump impeller designed by a method for optimizing a single flow pump impeller according to an embodiment of the present invention.

2 and 3, a centrifugal pump 1 including a single flow pump impeller designed according to an optimum design method of a single flow pump impeller according to an embodiment of the present invention includes a single flow pump impeller 30, (10) and a drive motor (3).

The centrifugal pump 1 according to the embodiment of the present invention includes a single flow path impeller 30 designed by an optimized design method of a single flow path pump impeller so that a bulky fluid can easily pass through, And it is possible to have a high pump efficiency.

Meanwhile, in one embodiment of the present invention, the drive motor 3 includes a drive shaft 5 extending downward to be rotatable about its center, and a fluid flowing axially in the lower end of the drive shaft can be radially discharged A single flow pump impeller 30 is installed.

The casing 10 may have an impeller 30 therein. Inside the casing (10), a pump chamber (11) partitioned by an inner wall can be formed. The pump chamber 11 may be formed to have a semicircular cross section so that the discharge portion 37 of the impeller 30 can be received therein.

At this time, the inlet pipe 13 of the casing 10 may be formed on the lower side of the casing. Further, the fluid flows into the casing 10 through the inlet pipe 13 by the suction operation by the rotation of the impeller 30.

2, the discharge pipe 15 of the casing 10 is formed in a direction perpendicular to the inflow pipe 13, as shown in Fig. 2, for example, at one side of the casing 10, To be discharged to the outside.

2, the inlet pipe 13 and the outlet pipe 15 of the casing 10 may have a cylindrical shape, but the present invention is not limited thereto.

4 is a perspective view illustrating an inner passage of a single flow pump impeller designed according to an optimum design method of a single flow pump impeller according to an embodiment of the present invention.

3, a single flow pump impeller 30 designed according to an optimization method of a single flow pump impeller according to an embodiment of the present invention includes a first plate 31, a second plate 33, a suction portion 35 And a discharging portion 37. [0050]

At this time, the single flow pump impeller 30 may be a bladeless impeller.

The single flow pump impeller 30 according to the embodiment of the present invention is capable of reducing the pumping force by the fluid or reducing the pumping force of the impeller 30 when the fluid is pumped by discharging the fluid through the fluid flow passage 41 without being caught by the impeller 30. [ Damage can be prevented.

3, the first plate 31 and the second plate 33 of the impeller 30 are formed in a disc shape, and the impeller 30 may be formed in a cylindrical shape as a whole. However, The portion 37 may be curved.

Accordingly, the fluid flowing into the single flow pump impeller 30 can move along the spiral-shaped fluid flow passage 41. [

In addition, in an embodiment of the present invention, a coupling member 39 may be formed at the center of the first plate 31, to which the lower end of the driving shaft 5 is inserted. The coupling member 39 may have a cylindrical shape and a coupling hole 39a may be formed at the center thereof. At this time, the driving shaft 5 is inserted into the coupling hole 39a of the coupling member 39 and is engaged.

Meanwhile, in the embodiment of the present invention, the single flow pump impeller 30 may apply a centrifugal force to the fluid flowing into the suction unit 35 during rotation so that the fluid flows to the discharge unit 37 by the centrifugal force.

At this time, the suction portion 35 of the impeller 30 may be formed on the lower surface of the second plate 33 in a cylindrical shape having a suction port 35a formed at the center portion thereof. The suction portion 35 of the impeller 30 is installed in the inlet pipe 13 of the casing 10.

3, the discharge portion 37 of the impeller 30 may be curved between the first plate 31 and the second plate 33 in one embodiment of the present invention. At this time, the discharge portion 37 may be formed in a shape in which a part of the outer peripheral surface of the side surface of the cylindrical casing 10 is cut inward.

At this time, the discharge portion 37 and the suction portion 35 of the impeller 30 may be partitioned by the second plate 33 of the impeller.

3 and 4, a fluid flow passage 41, which is a spiral single flow path extending from the suction portion 35 to the discharge portion 37, may be formed in the impeller 30.

At this time, the fluid flow passage 41 may have a curved curved shape so that the fluid introduced into the suction portion 35 can move to the discharge portion 37 without interfering with the inner curved surface.

In one embodiment of the present invention, the fluid flow passage 41 allows fluid flowing into the suction portion 35 to flow without resistance along the curved surface.

The optimal design method of a single flow pump impeller according to an embodiment of the present invention may include design parameter selection and objective function determination step (SlO) for determining the shape of a single flow pump impeller.

First, a design parameter for determining the shape of a single flow pump impeller and a design parameter for determining the shape of the impeller are selected in order to maximize the objective function in the objective function determination step (S10).

5 is a graph showing the volume distribution of a basic model impeller in a method of optimizing a single flow pump impeller according to an embodiment of the present invention. FIG. 6 is a graph showing design variables, design areas, and Bezier curves in an optimal design method for a single flow pump impeller according to an embodiment of the present invention.

4, in a method of optimizing design of a single flow pump impeller according to an embodiment of the present invention, the point at which the smallest cross-sectional area of the cross-sectional area of the fluid flow passage 41 starts, .

Referring to FIG. 6, the internal flow path cross-sectional area of the impeller at an angle θ of 0 ° to 70 ° and 360 ° is fixed to the impeller of the basic model.

In addition, the design parameter is P2, which is the cross-sectional area of the inner flow path at a position where the angle of the impeller is 160 degrees and the angle of the impeller is 270 degrees.

The basic model impeller will be described below.

On the other hand, the basic model of the impeller can be designed by applying the Stepanoff theory, which is a design technique for securing the stability of the internal flow.

In this case, the Stepanoff theory minimizes the loss due to the flow velocity difference by keeping the internal flow rate constant by keeping the internal flow cross-sectional area constant according to theta position, It is applied to design.

The graph shown in FIG. 5 is a volume distribution of a basic model impeller designed using the Stepanoff theory.

In this case, the impeller angle is designed to have a very small cross-sectional area distribution in order to secure the thickness of the impeller casing in the range of 0 ° to 70 °. The flow range of the impeller angle (θ) As the impeller angle increases, the flow cross sectional area is designed to increase constantly.

That is, referring to Figure 6, in the below-degree angle 0 degree 70 of the base model, the impeller internal flow path cross-sectional area is 130mm 2, the 360 may be 3800 mm 2.

Since the objective of optimizing the shape of the impeller is to optimize the pump efficiency, the objective function is the pump efficiency (η) as shown in the following equation (1).

Figure 112015030509366-pat00002

In this case, η = pump efficiency, ρ = density, g = gravitational acceleration, H = head, Q = volume flow rate, τ = torque, ω = angular acceleration, and ηm = motor efficiency.

Referring to FIG. 1, in the design region selection step (S20) for determining the upper and lower limit values of design variables in one embodiment of the present invention, designing an appropriate design area by limiting the range of design variables The areas are shown in Table 1 below.

Figure 112015030509366-pat00003

That is, in the design region selection step (S20) for determining the upper and lower limit values of design variables, P1 is 130 mm 2 or more and 2330 mm 2 And P2 is not less than 1600 mm 2 and not more than 3800 mm 2 .

In this case, the design area of the design variable that determines the upper and lower limit values of the design variables is determined within a range in which the pump efficiency, which is an objective function, does not fall sharply through the preceding calculation.

When the design variables and the design area are determined as described above, an optimum lattice system for the analysis is formed. In the present invention, a test for removing the lattice dependency is used to calculate a pump efficiency of a total of 500,000 lattices for a single flow path.

Referring to FIG. 1, in a step S30 of combining design variables using a curve fitting in a predetermined design area in an embodiment of the present invention, the design variables P1 and P2 are controlled using a curve fitting method, P1 < / RTI > and P2, which can be maximized.

At this time, Curve Fitting is to obtain the most ideal mathematical straight line or curve that can express the data using realistic data.

The optimal design method of a single flow pump impeller according to an exemplary embodiment of the present invention may use a Bezier curve as one of the curve fitting methods, but the present invention is not limited thereto.

Referring to FIG. 6, the Bezier curve is a parameter curve often used in computer graphics and related fields. Bezier curves are widely used in computer graphics to model smooth curves.

In the present invention, a three-dimensional Bezier curve is used to model the problem of improvement in pump efficiency. The 3-D Bezier curve is shown in Equation 2 below.

Figure 112015030509366-pat00004

At this time, P0, P1, P2, and P3 are the control points of the 3-D Bezier curve.

On the other hand, by changing the position of the control point, which is the cross-sectional area of the internal flow path, all curve shapes necessary for improving the pump efficiency, which is an objective function, can be obtained. Depending on the position of the control points P0, P1, P2, and P3, the shape of the Bezier curve to be generated is different.

In an embodiment of the present invention, a three-dimensional Bezier curve can be generated using two control points (P1 and P2) and two control points (P0 and P3) that are moved. At this time, as shown in FIG. 6, the x-axis is the angle of the impeller and the y-axis is the inner flow path cross-sectional area of the impeller.

Hereinafter, how to control the position of the control point in order to obtain the internal flow path cross-sectional area for improving the pump efficiency according to an embodiment of the present invention will be described below.

First, among the four control points P0, P1, P2, and P3, the control points P0 and P3 are fixed in the diagonal direction facing each other. That is, referring to FIG. 6, P0 is fixed to (70, 130) and P3 is fixed to (360, 3800).

On the other hand, P1 may be a place where the impeller angle [theta] is 160 degrees and P2 is a place where the angle [theta] of the impeller is 270 degrees. At this time, it is possible to control by moving P1 and P2 up and down. As a result, Bezier curves can be generated by P0, P1, P2, and P3.

7 is a graph showing twelve experimental points through Latin hypercube sampling in a method of optimizing a single flow pump impeller according to an embodiment of the present invention.

In an exemplary embodiment of the present invention, the numerical analysis step S40 in the selected design domain includes a step S41 of determining a plurality of experimental points through Latin hypercube sampling, and a step S41 of performing a three-dimensional RANS (Reysolds-averaged Navier (Step S42) of obtaining an objective function value through analysis of the result of the analysis.

In the step S41 of determining a plurality of experimental points through the Latin hypercube sampling, a plurality of experiment points to calculate the optimum objective function value are determined by combining the control points P1 and P2 obtained through the Bezier curve.

Referring to FIG. 7, 12 experimental points are determined by Latin hypercube sampling, which is useful for sampling a specific experimental point in a design region having a multi-dimensional distribution.

Also, in one embodiment of the present invention, in step S42 of obtaining an objective function value through a three-dimensional RANS analysis at a plurality of experiment points, an objective function value is obtained through a three-dimensional RANS analysis at twelve experiment points.

At this time, the RANS equation for the flow analysis in the numerical analysis is discretized by the finite volume method, and the working fluid passing through the single flow pump impeller 30 is made of water at 25 degrees. Also, the boundary condition of the inlet is the atmospheric pressure in the uniform state, and the outlet condition is the mass flow rate.

In this numerical analysis step, a numerical analysis is performed in a predetermined design area to determine an objective function value at each test point. In the present invention, by using ANSYS CFX-13.0, commercial software of ANSYS Co., Numerical analysis is performed assuming steady state.

At this time, the SST (shear stress transport) model, which is known to have excellent performance in predicting the flow separation due to the back pressure gradient, was used as the turbulence model. The rotating impeller used a grating system and a goniometer was used in the area near the wall of the rotating impeller.

8 is a graph for predicting optimal design parameters capable of maximizing an objective function by generating a reaction surface according to a design variable and an objective function by a neural network technique.

 Meanwhile, in an embodiment of the present invention, searching for an optimum point in a design domain through a numerical analysis result (S50) searches an optimal point in a design domain based on results obtained in a numerical analysis step.

At this time, the optimum point search (S50) in the embodiment of the present invention uses the neural network model (RBNN), which is a surrogate model, to calculate the optimum point.

The neural network model is an algorithm that describes human functions that learn from experience and predicts from existing data. The neural network model searches the optimal point by reflecting the weight through the prediction ability of the network by the basic element of neuron.

On the other hand, the data obtained by comparing the objective function obtained from the optimum shape by the reference model and the neural network technique and the objective function obtained through the numerical analysis are shown in Table 2 below.

Figure 112015030509366-pat00005

As a result of this optimization, the objective function through the neural network technique was predicted to be 69.5%, and the objective function obtained from the RANS analysis was calculated to be 69.6%.

From this, it can be confirmed that the objective function predicted through the neural network technique is comparatively accurate when compared with the value calculated by the RANS analysis.

In addition, the reference model impeller has 68.4% of the objective function obtained by the RANS analysis, which is 1.2% higher than the objective function obtained by the optimization design.

More specifically, in the numerical analysis step, a value of an objective function for experimental points obtained by Latin hypercube sampling is evaluated, a neural network model is constructed based on the evaluated objective functions, and then a neural network model is constructed using SQP The optimum point is searched.

Here, the SQP is a method for optimizing a nonlinear objective function in a nonlinear constraint, which is a conventional method, and a detailed description thereof will be omitted.

Also, since the optimum point may be changed according to the initial value of the SQP, it is desirable to change the initial value several times to obtain the final optimal point of the neural network.

Thus, a three-dimensional mesh plot of the optimal point optimized by the neural network model is shown. The optimal design parameters are 1138 mm 2 for P1 and 1739 mm 2 for P2.

9 is a graph illustrating sensitivity analysis of design parameters of an objective function in a method of optimizing a single flow pump impeller according to an embodiment of the present invention.

At this time, the change of the design variable is limited to ± 10% of the optimal value and represents the objective function value at the optimum point. As a result of the sensitivity analysis, it can be seen that the objective function is more sensitive to P2 than P1.

In an exemplary embodiment of the present invention, searching for an optimum point in a design domain through a numerical analysis result (S50) may further include comparing (S60) whether or not the optimum point is valid.

FIG. 10 is a graph showing the lift of a basic model and an optimal model through a numerical analysis and a performance test in an optimum design method of a single flow pump impeller according to an embodiment of the present invention.

Design items at the design point are shown in Table 3 below.

Figure 112015030509366-pat00006

Referring to FIG. 10, the design model satisfies the design specifications because the lift of the basic model is about 10.4 m and the lift of the optimum model is about 10.6 m at the design point, flow rate variable, through the performance test.

11 is a graph showing efficiency in a basic model and an optimal model through numerical analysis and performance test in a method of optimizing a single flow pump impeller according to an embodiment of the present invention.

Referring to FIG. 11, the final objective function of the basic model is 69.9% and the objective function of the optimal model is 71.7%, which is 1.8%.

FIG. 12 is a graph illustrating the flow velocity distribution of an impeller according to an impeller angle in an optimum design method of a single flow pump impeller according to an embodiment of the present invention.

At this time, in the case of the basic model impeller, the inner velocity according to the impeller angle is very unstable, while the optimum model shows a relatively stable velocity distribution.

Therefore, the optimum design method of the single flow pump impeller according to the embodiment of the present invention can improve the pump efficiency by effectively suppressing the non-uniform flow components by optimizing the distribution of the internal flow path cross-sectional area.

The single flow pump impeller designed according to the optimization design method of the single flow pump impeller according to the embodiment of the present invention is formed such that the inlet port and the outlet port are curved so that the sludge having viscosity such as manure, wastewater, dirt, And can be easily pumped.

The single channel pump impeller and the centrifugal pump according to an embodiment of the present invention can easily pass through bulky solids, thereby preventing failure and damage due to clogging, and having high pump efficiency.

The optimized design method of a single flow pump impeller according to an embodiment of the present invention can improve pump efficiency and stability against internal flow through numerical optimization.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is to be understood that the invention is not limited to the disclosed exemplary embodiments, It will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined by the appended claims.

1: Centrifugal pump 3: Drive motor
5: drive shaft 10: impeller
11: pump chamber 13: inlet pipe
15: discharge pipe 30: single flow pump impeller
31: First Edition 33: Second Edition
35: Suction part 35a: Suction part
37: discharging portion 39: engaging member
39a:

Claims (13)

Selection of design parameters and determination of objective function considering the shape of single flow pump impeller;
A design region selection step of determining an upper limit value and a lower limit value of the design parameter;
Combining the design variables using the curve fitting in the selected design area;
A numerical analysis step in the selected design area; And
Searching for an optimal point in the design domain through the result of the numerical analysis,
Wherein the design parameters are the internal flow path cross-sectional areas P1 and P2 of the single flow path impeller which can vary according to the angle of the single flow path impeller,
Figure 112016014854351-pat00021
Optimized Design Method of a Single Euro Pump Impeller.
In this case, η = pump efficiency, ρ = density, g = gravitational acceleration, H = head, Q = volume flow rate, τ = torque, ω = angular acceleration, The method according to claim 1,
Wherein the step of searching for an optimal point in the design domain through the numerical analysis results further comprises comparing the optimum point to be valid. The method of claim 1, wherein
Wherein a point at which a portion of the single flow path impeller having a smallest internal flow path cross section starts is an impeller angle of 0 degrees and a maximum point thereof is 360 degrees and the impeller angle is a transverse axis, P1 and P2 are arbitrary points of the horizontal axis and the vertical axis. The method of claim 3,
The optimal design method of a single flow pump impeller having an inner flow cross sectional area of 130 mm 2 at an angle of the impeller of not less than 0 degrees and not more than 70 degrees, and 3800 mm 2 at 360 degrees, P1 at 160 degrees, and P2 at 270 degrees. 5. The method of claim 4,
In the design region selection step of determining the upper and lower limit values of the design parameters, P1 is 130 mm 2 or more and 2330 mm 2 And P2 is 1600 mm < 2 > Not more than, 3800 mm 2 Optimized design method for single channel pump impeller. The method according to claim 1,
Wherein the curve fitting comprises generating a Bezier curve represented by a starting point, an ending point and two control points. The method of claim 6, wherein
Wherein the starting point is a point when the angle of the impeller is 70 degrees and the end point is a point when the angle of the impeller is 360 degrees and the two control points are P1 and P2,
And generating a Bezier curve represented by the starting point, the ending point and the two control points at an angle of the impeller of 70 to 360 degrees. The method according to claim 1,
Wherein the numerical analysis step in the selected design area comprises: determining a plurality of experimental points through Latin hypercube sampling in the selected design area;
And obtaining the value of the objective function through 3D RANS (Reynolds-averaged Navier-Stokes) analysis at the plurality of experiment points. The method according to claim 1,
The step of searching for the optimum point in the design domain through the result of the numerical analysis includes a step of constructing a neural network model and then determining an optimum design parameter value from the neural network technique using SQP, Way. 10. The method of claim 9,
After constructing the neural network model, in the step of determining optimal design parameter values from neural network technique using SQP, P1 is 1138 mm 2 P2 is 1739 mm < 2 > Optimized Design Method of a Single Euro Pump Impeller. 3. The method of claim 2,
Wherein comparing the optimal point is a step of comparing a predicted objective function value by a neural network technique with an objective function value obtained by numerical analysis. A single flow pump impeller comprising an impeller designed by an optimized design method of a single flow pump impeller according to any one of claims 1 to 11. A single flow pump impeller according to claim 12;
A driving shaft formed on one surface of the impeller and operated by a driving motor; And
And a casing accommodating the impeller and a portion of the drive shaft and having a suction portion and a discharge portion for suction and discharge of fluid.
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