KR20210151274A - Design method of two vane pump impeller for wastewater treatment - Google Patents

Abstract

The present invention relates to a method for designing an impeller of a two-vane pump for wastewater, and more particularly, to a method for designing an impeller of a two-vane pump for wastewater for designing a two-vane pump of a desired specification. In the impeller design method of the two vane pump for wastewater, the configuration of the present invention for achieving the above object is formed to extend outwardly from the pump inlet in a streamlined shape and has a pair of mutually symmetrical impellers, a) the objective function setting up; b) setting design parameters for deriving the set objective function; c) setting maximum and minimum values of the design variables; d) deriving the value of the objective function according to the set value of the design variable through numerical analysis; e) deriving a linear function expression for deriving the value of the objective function by using the value of the objective function according to the derived value of the design variable; and f) deriving the value of the design variable that satisfies the design objective function value as a design plan using the derived first-order function formula.

Description

Design method of impeller of two vane pump for wastewater {DESIGN METHOD OF TWO VANE PUMP IMPELLER FOR WASTEWATER TREATMENT}

The present invention relates to a method for designing an impeller of a two-vane pump for wastewater, and more particularly, to a method for designing an impeller of a two-vane pump for wastewater for designing a two-vane pump of a desired specification.

In general, a wastewater pump is a pump that transports sewage, wastewater sludge, and the like, and is widely used in various industrial fields.

Unlike a general submersible pump, such a wastewater pump has to move a fluid containing foreign substances, and thus a flow path clogging occurs frequently. As such, the clogging of the flow path may reduce the performance of the wastewater pump, such as lifting efficiency, or cause failure or damage of the wastewater pump. Therefore, it is important to design the wastewater pump so that clogging does not occur.

The vortex pump is designed to prevent clogging of the flow path of a wastewater pump to which an impeller having a plurality of flow paths is applied. However, the vortex pump has a problem in that, as the length of the impeller is shortened, the lifting efficiency of the vortex pump is only about 30% lower than that of the conventional wastewater pump.

The single channel pump forms one flow path inside the impeller, and the flow path rotates together according to the rotation of the impeller to transport wastewater. The single-channel pump thus prepared has an advantage in that the lift efficiency is twice as high as that of the vortex pump without clogging the flow path. However, since the impeller of the single-channel pump has an asymmetric structure unlike a general impeller, there is a problem that the distribution of fluid force is not constant when operating the single-channel pump, so that vibration occurs greatly. There is a problem in that it is difficult to apply to the field as the vibration increases more significantly.

Two vane pumps have a symmetrical structure with two impellers, so there is little vibration and a wide flow path, so it has the advantage of passing solids better than general vortex pumps.

However, in the prior art, there is no technology for designing the structure of the impeller so as to have a target efficiency for a desired lift and a size of a solid that can pass through, so there is a problem in that a lot of trial and error has to be experienced in manufacturing a desired specification.

Therefore, there is a need for an impeller design technology for a two-vane pump that can maximize pump efficiency while satisfying the target head and the size of passable solids.

Korean Patent No. 10-1647394

An object of the present invention for solving the above problems is to provide a method for designing an impeller of a two-vane pump for wastewater for designing a two-vane pump of a desired specification.

The technical problems to be achieved by the present invention are not limited to the technical problems mentioned above, and other technical problems not mentioned can be clearly understood by those of ordinary skill in the art to which the present invention belongs from the description below. There will be.

In the impeller design method of the two vane pump for wastewater, the configuration of the present invention for achieving the above object is formed to extend outwardly from the pump inlet in a streamlined shape and has a pair of mutually symmetrical impellers, a) the objective function setting up; b) setting design parameters for deriving the set objective function; c) setting maximum and minimum values of the design variables; d) deriving the value of the objective function according to the set value of the design variable through numerical analysis; e) deriving a linear function expression for deriving the value of the objective function by using the value of the objective function according to the derived value of the design variable; and f) deriving the value of the design variable that satisfies the design objective function value as a design plan using the derived first-order function formula.

In an embodiment of the present invention, in step a), the objective function may be the head, efficiency, and maximum volume of solids that can pass.

상기 수학식에 의해 연산되며, 여기서, D는 상기 임펠러의 펌프 유입부 단부로부터 마주보는 임펠러까지 접선 방향의 길이인 것을 특징으로 할 수 있다.In an embodiment of the present invention, the maximum passable solid volume is,

It is calculated by the above formula, where D is a length in a tangential direction from the end of the pump inlet of the impeller to the opposite impeller.

In an embodiment of the present invention, in step b), the design variable may be characterized in that it consists of x-axis and y-axis displacements for a plurality of points on the impeller.

In an embodiment of the present invention, in step b), the design variable includes: a first variable that is a y-axis displacement of a first point located at one end of the impeller formed on the inlet side; a second variable, the x-axis displacement at a second point located a first distance away from the inlet end; a third variable, the y-axis displacement at the second point; a fourth variable, the x-axis displacement at a third point located a second distance away from the inlet end; a fifth variable, the y-axis displacement at the third point; and a sixth variable that is a y-axis displacement of a fourth point located at the other end of the impeller, wherein the first point, the second point, the third point, and the fourth point are located on the impeller can be done with

In an embodiment of the present invention, in step c), the first variable may be characterized in that it is provided to be set within the range of -2% to 2% of the entire length of the impeller at the initially set first point. .

In an embodiment of the present invention, in step c), the second variable may be characterized in that it is provided so that the first interval is set in a range of 10% to 50% of the entire length of the impeller.

In an embodiment of the present invention, in the step c), the third variable may be characterized in that it is provided to be set within the range of -5 to 5% of the entire length of the impeller at the initially set second point.

In an embodiment of the present invention, in step c), the fourth variable may be characterized in that it is provided so that the second interval is set in a range of 50 to 90% of the entire length of the impeller.

In an embodiment of the present invention, the fifth variable may be characterized in that it is provided to be set within the range of -5 to 5% of the entire length of the impeller at the third point initially set in step c).

In an embodiment of the present invention, in step c), the sixth variable may be characterized in that it is provided to be set within the range of -5 to 5% of the entire length of the impeller at the initially set fourth point.

In an embodiment of the present invention, in the step d), the first variable, the second variable, the third variable, the fourth variable, the fifth variable, and the sixth variable, in a state in which the meridian plane of the impeller of the tube vane pump is fixed. the value of the objective function for the shape of the impeller, formed in accordance with the value of the variable may be characterized in that adapted to be derived by the 2 ^K factor experiments.

인 것을 특징으로 할 수 있다.In an embodiment of the present invention, in step e), the linear function formula derived for the head is,

It can be characterized as being.

인 것을 특징으로 할 수 있다.In an embodiment of the present invention, in step e), the linear function formula derived for the efficiency is,

It can be characterized as being.

인 것을 특징으로 할 수 있다.In an embodiment of the present invention, in step e), the linear function formula derived for the maximum passable solid volume is,

It can be characterized as being.

The configuration of the present invention for achieving the above object provides a tube vane pump designed by the impeller design method of the tube vane pump for wastewater.

The effect of the present invention according to the above configuration is to prevent failure and damage by pumping manure, wastewater, filth, and solids without clogging as designed, and has high lifting efficiency.

In addition, it is possible to conveniently design an impeller having a desired target specification using a design plan derived according to the optimal design method of the present invention.

It should be understood that the effects of the present invention are not limited to the above-described effects, and include all effects that can be inferred from the configuration of the invention described in the detailed description or claims of the present invention.

1 is a flowchart of a method for designing an impeller of a tube-vane pump for wastewater according to an embodiment of the present invention.
Figure 2 is an exemplary view of the tube vane pump according to an embodiment of the present invention.
3 is a graph showing the lift and efficiency according to the flow rate ratio according to an embodiment of the present invention.
4 is a cross-sectional view taken along line AA′ of FIG. 2 according to an embodiment of the present invention.
5 is an exemplary view showing a point set as a design variable according to an embodiment of the present invention.
6 is an exemplary view showing a two-vane pump impeller designed as a design variable according to an initially set median value.
7 (a) is a tube-injection pump impeller according to Experimental Example 1.
7 (b) is a two vane pump impeller according to Experimental Example 2.
7 (c) is a tube-injection pump impeller according to Experimental Example 3.
7 (d) is a tube-vane pump impeller according to Experimental Example 4.
7 (e) is a tube-injection pump impeller according to Experimental Example 5.
7 (f) is a tube-injection pump impeller according to Experimental Example 6.
Figure 7 (g) is a tube-injection pump impeller according to Experimental Example 7.
7(h) is a tube-injection pump impeller according to Experimental Example 8.
Figure 8 (a) is a tube-injection pump impeller according to Experimental Example 9.
Figure 8 (b) is a tube vane pump impeller according to Experimental Example 10.
Figure 8 (c) is a tube vane pump impeller according to Experimental Example 11.
8 (d) is a tube-injection pump impeller according to Experimental Example 12.
Figure 8 (e) is a tube-injection pump impeller according to Experimental Example 13.
8 (f) is a tube-injection pump impeller according to Experimental Example 14.
Figure 8 (g) is a tube-vane pump impeller according to Experimental Example 15.
8 (h) is a tube-injection pump impeller according to Experimental Example 16.
9 is a graph showing the change of the objective function according to the change of the value of each design variable according to an embodiment of the present invention.
10 is an exemplary diagram illustrating a tube-injection pump impeller designed as a design variable according to an initially set median value and an optimally designed two-vane pump impeller according to an embodiment of the present invention.

Hereinafter, the present invention will be described with reference to the accompanying drawings. However, the present invention may be embodied in several different forms, and thus is not limited to the embodiments described herein. And in order to clearly explain the present invention in the drawings, parts irrelevant to the description are omitted, and similar reference numerals are attached to similar parts throughout the specification.

Throughout the specification, when a part is said to be “connected (connected, contacted, coupled)” with another part, it is not only “directly connected” but also “indirectly connected” with another member interposed therebetween. "Including cases where In addition, when a part "includes" a certain component, this means that other components may be further provided without excluding other components unless otherwise stated.

The terminology used herein is used only to describe specific embodiments, and is not intended to limit the present invention. The singular expression includes the plural expression unless the context clearly dictates otherwise. In the present specification, terms such as “comprise” or “have” are intended to designate that a feature, number, step, operation, component, part, or combination thereof described in the specification exists, but one or more other features It should be understood that this does not preclude the existence or addition of numbers, steps, operations, components, parts, or combinations thereof.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings.

1 is a flowchart of an impeller design method of a tube vane pump for wastewater according to an embodiment of the present invention, and FIG. 2 is an exemplary view of a tube vane pump according to an embodiment of the present invention.

Before describing the impeller design method of the tube vane pump for wastewater according to an embodiment of the present invention shown in FIG. 1, first, the basic shape of the tube vane pump will be described with reference to FIG. 2 .

The two vane pump 100 of the present invention may be provided with a pair of impellers 110 and 120 formed between the hub 140 and the shroud 150 .

Here, the pair of impellers 110 and 120 may be provided symmetrically to each other, and may be provided to extend outwardly from the pump inlet 130 in a streamlined shape.

More specifically, the pair of impellers 110 and 120 is formed to extend outwardly of the hub 140 while drawing a streamlined curve from the inlet 110 . In this case, the impellers 110 and 120 may be extended to form a curved line so that the inlet 130 side is concave.

In the method for designing the impeller of the tube-vane pump for wastewater according to an embodiment of the present invention prepared as described above, first, the step of setting the objective function (S10) may be performed.

In the step of setting the objective function (S10), the objective function relates to a target specification, and in the present invention, the objective function is set as the lift, efficiency, and maximum volume of passable solids.

3 is a graph showing the lift and efficiency according to the flow rate ratio according to an embodiment of the present invention.

Referring to Figure 3, the two vane pump 100 is not the same graph for the lift and efficiency according to the flow rate ratio.

Specifically, looking at the lift graph according to the flow ratio, the head decreases as the flow ratio increases.

And, looking at the efficiency graph according to the flow rate ratio, as the flow rate ratio increases, the efficiency increases and has a two-dimensional curve that decreases at some point.

In addition, when only the head and efficiency are calculated, the possibility of clogging by solids is high due to the characteristics of the wastewater pump, even if a two-vane pump having the maximum efficiency according to the lift is designed.

Therefore, by considering the maximum size of passable solids in the objective function, it is necessary to design a design that allows solids to pass and at the same time derives maximum efficiency according to the target lift.

Therefore, in the present invention, as the objective function, the head, the efficiency, and the maximum volume of solids that can pass through were set.

The maximum volume of the passable solid may be calculated by Equation 1 below.

Here, D is a length in a tangential direction from the end of the pump inlet of the impeller to the impeller facing it.

After the step of setting the objective function ( S10 ), the step of setting design variables for deriving the set objective function ( S20 ) may be performed.

In the step of setting the design variable for deriving the set objective function (S20), the design variable may be composed of x-axis and y-axis displacement for a plurality of points on the impeller.

4 is a cross-sectional view taken along line A-A' of FIG. 2 according to an embodiment of the present invention.

Referring to FIG. 4 , in the step of setting design variables for deriving a set objective function ( S20 ), the design variables of the present invention are a first variable, a second variable, a third variable, a fourth variable, and a fifth variable. , and as the sixth variable, a total of six were set.

However, the number of design variables is not limited thereto, and the number of design variables can be changed. Hereinafter, the case of optimal design with six design variables will be described.

The first variable refers to the y-axis displacement of the first point 11 located at one end of the impellers 110 and 120 . In this case, one end of the impellers 110 and 120 means the inlet 130 side of the pump.

The second variable refers to the x-axis displacement at the second point 12 located at a point separated by a first interval from the end of the pump inlet 130 .

The first interval may be provided to be set in a range of 10 to 50% of the entire length of the impeller. That is, when the first point 11 is 0, the second point 12 may be set to a point that is 10 to 50% of the entire length of the impellers 110 and 120 .

The third variable refers to the y-axis displacement at the second point 12 .

The fourth variable refers to the x-axis displacement at the third point 13 located at a point separated by a second interval from the end of the pump inlet 130 .

The second interval may be provided to be set in a range of 50 to 90% of the entire length of the impeller. That is, the third point 13 may be set to a point that is 50 to 90% of the entire length of the impellers 110 and 120 when the first point 11 is set to zero.

The fifth variable refers to the y-axis displacement at the third point 13 .

The sixth variable refers to the y-axis displacement of the other end of the impellers 110 and 120 .

The first point 11 , the second point 12 , the third point 13 , and the fourth point 14 are all located on the impellers 110 and 120 .

After the step (S20) of setting the design variables for deriving the set objective function, the step of setting the maximum and minimum values of the design variables (S30) may be performed.

In the step (S30) of setting the maximum and minimum values of the design variable, the first variable is in the range of -2% to 2% of the entire length of the impellers 110 and 120 at the initially set first point 11 It may be provided to be set to be changeable in .

The second variable may be set to be changeable within a range of 10% to 50% of the total length of the impellers 110 and 120 , and the second point 12 may be determined according to the set value.

The third variable may be set to be changeable within a range of -5 to 5% of the entire length of the impellers 110 and 120 at the initially set second point 12 .

The fourth variable may be set to be changeable within a range of 50% to 90% of the entire length of the impellers 110 and 120 , and the third point 13 may be determined according to the set value.

The fifth variable may be provided to be changeably set within the range of -5 to 5% of the entire length of the impellers 110 and 120 at the initially set third point 13 .

The sixth variable may be provided to be changeably set within the range of -5 to 5% of the total length of the impellers 110 and 120 at the initially set fourth point 14 .

5 is an exemplary view showing a point set as a design variable according to an embodiment of the present invention.

Referring to FIG. 5 , as the x-axis and y-axis displacements of the set design variables are changed, the shapes of the impellers 110 and 120 are also changed, so that the values of the objective function can be changed.

After the step (S30) of setting the maximum and minimum values of the design variable, the step of deriving the value of the objective function according to the set value of the design variable through numerical analysis (S40) may be performed.

The step (S40) of deriving the value of the objective function according to the value of the set design variable through numerical analysis is the first variable, the second variable, the third variable while the meridian plane of the impellers 110 and 120 is fixed. a fourth variable and the fifth variable and can be adapted to the derived by the value of the objective function for the shape of the impeller (110, 120) formed in accordance with the values of the six variables in the experiment 2 ^K factor.

According to the 2 ^K factor experiment, since there are 6 design variables, a total of 64 experiments must be performed.

Therefore, in the present invention, the design variables set for performing the 16 experiments are shown in Table 1 below.

Experimental example first variable
(%) second variable
(%) third variable
(%) 4th variable
(%) 5th variable
(%) 6th variable
(%) median 0 30 0 70 0 0 One -2 10 -5 50 -5 -5 2 2 10 -5 50 5 -5 3 -2 50 -5 50 5 5 4 2 50 -5 50 -5 5 5 -2 10 5 50 5 5 6 2 10 5 50 -5 5 7 -2 50 5 50 -5 -5 8 2 50 5 50 5 -5 9 -2 10 -5 90 -5 5 10 2 10 -5 90 5 5 11 -2 50 -5 90 5 -5 12 2 50 -5 90 -5 -5 13 -2 10 5 90 5 -5 14 2 10 5 90 -5 -5 15 -2 50 5 90 -5 5 16 2 50 5 90 5 5

In this experiment, the experiment was conducted with a combination of the median value of each design variable and the set maximum and minimum values of each design variable.

6 is an exemplary view showing a two vane pump impeller designed as a design variable according to an initially set median value.

Figure 7 (a) is a tube vane pump impeller according to Experimental Example 1, Figure 7 (b) is a tube vane pump impeller according to Experimental Example 2, Figure 7 (c) is a tube vane according to Experimental Example 3 a pump impeller, (d) of FIG. 7 is a two-vane pump impeller according to Experimental Example 4, FIG. 7E is a two-vane pump impeller according to Experimental Example 5, and (f) of FIG. 7 is Experimental Example 6 According to the tube vane pump impeller, Figure 7 (g) is a tube vane pump impeller according to Experimental Example 7, Figure 7 (h) is a tube vane pump impeller according to Experimental Example 8.

Figure 8 (a) is a tube vane pump impeller according to Experimental Example 9, Figure 8 (b) is a tube vane pump impeller according to Experimental Example 10, Figure 8 (c) is a tube vane according to Experimental Example 11 A pump impeller, (d) of FIG. 8 is a two-vane pump impeller according to Experimental Example 12, (e) of FIG. 8 is a two-vane pump impeller according to Experimental Example 13, and (f) of FIG. 8 is Experimental Example 14 According to the tube vane pump impeller, Figure 8 (g) is a tube vane pump impeller according to Experimental Example 15, Figure 8 (h) is a tube vane pump impeller according to Experimental Example 16.

6 to 8 are diagrams showing the shape of the impeller according to the design parameters set in Table 1.

9 is a graph showing the change of the objective function according to the change of the value of each design variable according to an embodiment of the present invention.

Referring to FIG. 9 , the change of the objective function according to the value of each design variable can be derived according to the impeller shape derived according to the ^{2k factor experiment.}

As shown in FIG. 9 , as the value of each design variable increases, the value of each objective function tends to increase or decrease.

As an example, it can be seen that, as the value of the first variable increases, the lift and efficiency increase while the maximum volume of passable solids decreases.

After the step (S40) of deriving the value of the objective function according to the value of the set design variable through numerical analysis, the first step for deriving the value of the objective function using the value of the objective function according to the value of the derived design variable A step (S50) of deriving a function expression may be performed.

In the step (S50) of deriving a linear function formula for deriving the value of the objective function using the value of the objective function according to the value of the derived design variable, the objective according to the value of the design variable derived according to the ^{2k factor experiment} Through regression analysis of the change in the function, a linear function expression using the design variable as an unknown variable can be derived.

The head may be derived by Equation 2 below.

The efficiency may be derived by Equation 3 below.

The maximum size of the passable solids may be derived by Equation 4 below.

In Equations 2, 3, and 4, x ₁ is a first variable, x ₂ is a second variable, x ₃ is a third variable, x ₄ is a fourth variable, x ₅ is a fifth variable, x ₆ is the value of the sixth variable.

After the step (S50) of deriving a linear function expression for deriving the value of the objective function using the value of the objective function according to the value of the derived design variable, the value of the design objective function is satisfied using the derived linear function expression A step (S60) of deriving the value of the design variable to a design plan may be performed.

In the step (S60) of deriving the value of the design variable that satisfies the design objective function value as a design plan using the derived linear function formula, the target design objective function using Equations 2, 3, and 4 above It may be provided to derive design variables that satisfy the values as a design plan of the impeller.

As an example, if the design objective function value of the head is 13 m and the design objective function value for the maximum size of solids that can pass is 12,121 mm ² , this can be satisfied, but a design variable capable of maximizing efficiency can be derived. have.

10 is an exemplary diagram illustrating a tube-injection pump impeller designed as a design variable according to an initially set median value and a tube-injection pump impeller optimally designed according to an embodiment of the present invention.

Fig. 10 (a) is an impeller in a state in which the design variable is an intermediate value, and Fig. 10 (b) is an exemplary view showing an optimally designed two vane pump impeller 100 according to the present invention.

As such, the optimally designed present invention showed higher efficiency as well as passing larger solids in the same head compared to the conventional impeller.

As such, according to the present invention, it is possible to prevent failure and damage and to have high lifting efficiency by pumping manure, wastewater, filth, and solid matter without clogging as designed.

In particular, according to the present invention, an impeller having a desired target specification can be conveniently designed using a design plan derived according to an optimal design method.

The present invention prepared as described above may be provided to be automatically made by a design program.

The above description of the present invention is for illustration, and those of ordinary skill in the art to which the present invention pertains can understand that it can be easily modified into other specific forms without changing the technical spirit or essential features of the present invention. will be. Therefore, it should be understood that the embodiments described above are illustrative in all respects and not restrictive. For example, each component described as a single type may be implemented in a dispersed form, and likewise components described as distributed may also be implemented in a combined form.

The scope of the present invention is indicated by the following claims, and all changes or modifications derived from the meaning and scope of the claims and their equivalents should be construed as being included in the scope of the present invention.

11: 1st point
12: second point
13: 3rd point
14: 4th point
100: tube vane pump
110, 120: impeller
130: inlet
140: hub
150: shroud

Claims (16)

In the impeller design method of the two vane pump for wastewater, which is formed to extend outward from the pump inlet in a streamlined shape and has a pair of symmetrical impellers,
a) setting an objective function;
b) setting design parameters for deriving the set objective function;
c) setting maximum and minimum values of the design variables;
d) deriving the value of the objective function according to the set value of the design variable through numerical analysis;
e) deriving a linear function expression for deriving the value of the objective function by using the value of the objective function according to the derived value of the design variable; and
f) Impeller design method of a two-vane pump for wastewater, characterized in that it comprises the step of deriving the value of the design variable that satisfies the design objective function value as a design using the derived first-order function formula.
The method of claim 1,
In step a),
The objective function is
The impeller design method of the tube-vane pump for wastewater, characterized in that it is the maximum volume of solids that can pass through, such as lift, efficiency, and lift.
3. The method of claim 2,
The maximum volume of solids that can pass through is,

It is calculated by the above formula,
Here, D is the impeller design method of the two vane pump for wastewater, characterized in that the length in the tangential direction from the end of the pump inlet of the impeller to the impeller facing.
The method of claim 1,
In step b),
The design variable is
The impeller design method of the tube-vane pump for wastewater, characterized in that it consists of x-axis and y-axis displacement for a plurality of points on the impeller.
5. The method of claim 4,
In step b),
The design variable is
a first variable that is a y-axis displacement of a first point located at one end of the impeller formed on the inlet side;
a second variable, the x-axis displacement at a second point located a first distance away from the inlet end;
a third variable, the y-axis displacement at the second point;
a fourth variable, the x-axis displacement at a third point located a second distance away from the inlet end;
a fifth variable, the y-axis displacement at the third point; and
It includes a sixth variable that is the displacement of the y-axis of the fourth point located at the other end of the impeller,
The first point, the second point, the third point and the fourth point is an impeller design method of a tube-in pump for wastewater, characterized in that located on the impeller.
6. The method of claim 5,
In step c),
The first variable is
Impeller design method of a tube-injector pump for wastewater, characterized in that it is provided to be set within the range of -2% to 2% of the entire length of the impeller at the initially set first point.
6. The method of claim 5,
In step c),
The second variable is
The impeller design method of the two vane pump for wastewater, characterized in that the first interval is provided to be set in a range of 10% to 50% of the entire length of the impeller.
6. The method of claim 5,
In step c),
The third variable is
Impeller design method of the tube vane pump for wastewater, characterized in that it is provided to be set within the range of -5 to 5% of the entire length of the impeller at the initially set second point.
6. The method of claim 5,
In step c),
The fourth variable is
The impeller design method of the two vane pump for wastewater, characterized in that the second interval is provided to be set in a range of 50 to 90% of the entire length of the impeller.
6. The method of claim 5,
The fifth variable is
In step c),
The impeller design method of the tube-vane pump for wastewater, characterized in that it is provided to be set within the range of -5 to 5% of the entire length of the impeller at the initially set third point.
6. The method of claim 5,
In step c),
The sixth variable is
The impeller design method of the tube-vane pump for wastewater, characterized in that it is provided to be set within the range of -5 to 5% of the entire length of the impeller at the initially set fourth point.
6. The method of claim 5,
Step d) is,
In the state in which the meridian surface of the impeller of the tube-vane pump is fixed,
The first variable, the said second variable, the third variable and the fourth variable, and the fifth parameter and the value of the objective function for the shape of the impeller is formed in accordance with the value of the sixth variable, and adapted to be derived by the 2 ^K factor experiment The impeller design method of the two vane pump for wastewater.
3. The method of claim 2,
In step e),
The linear function formula derived for the head is,

(where x ₁ is the first variable, x ₂ is the second variable, x ₃ is the third variable, x ₄ is the fourth variable, x ₅ is the fifth variable, and x ₆ is the sixth variable)
The impeller design method of the two vane pump for wastewater, characterized in that
3. The method of claim 2,
In step e),
The linear function formula derived for the efficiency is,

(where x ₁ is the first variable, x ₂ is the second variable, x ₃ is the third variable, x ₄ is the fourth variable, x ₅ is the fifth variable, and x ₆ is the sixth variable)
The impeller design method of the two vane pump for wastewater, characterized in that
3. The method of claim 2,
In step e),
The linear function formula derived for the maximum passable solid volume is,

(where x ₁ is the first variable, x ₂ is the second variable, x ₃ is the third variable, x ₄ is the fourth variable, x ₅ is the fifth variable, and x ₆ is the sixth variable)
The impeller design method of the two vane pump for wastewater, characterized in that
A two-vane pump designed by the impeller design method of the two-vane pump for wastewater according to claim 1.

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