KR102352973B1 - Design method of two vane pump for wastewater treatment and two vane pump designed accrodingly - Google Patents

Abstract

The present invention relates to a method for designing a two-vane pump for wastewater treatment and more specifically, to a method for designing a two-vane pump for wastewater treatment, which can increase efficiency depending on a head and the size of a passable solid to the maximum. To this end, the method for designing a two-vane pump for wastewater treatment comprises the steps of: a) setting an objective function; b) setting design parameters of an impeller and a volute for deriving the set objective function; c) deriving a value of the objective function depending on values of the set design parameters through numerical analysis; d) deriving a functional formula for deriving the value of the objective function by using the derived value of the objective function depending on the values of the design parameters; and e) determining the values of the design parameters that satisfy a value of a design objective function as a design plane by using the derived functional formula.

Description

DESIGN METHOD OF TWO VANE PUMP FOR WASTEWATER TREATMENT AND TWO VANE PUMP DESIGNED ACCRODINGLY

The present invention relates to a design method of a two-vane pump for wastewater and a two-vane pump for wastewater designed accordingly, and more particularly, to a design of a two-vane pump for wastewater that can maximize efficiency and passable solids size according to the lift It relates to a method and a tube-vane pump for wastewater designed accordingly.

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 performance, such as pump efficiency, of the wastewater pump, or may cause malfunction 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 pump efficiency 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 pump efficiency is more than twice as high as that of the vortex pump without causing clogging of the flow path. However, since the impeller of the single-channel pump has an asymmetric structure unlike a general impeller, there is a problem in 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 a design technology that considers the interaction between the impeller and the volute of the two vane pump that can maximize the pump efficiency while satisfying the target head and the size of the solid that can pass.

Korean Patent No. 10-1647394

An object of the present invention for solving the above problems is to provide a method of designing a tube-vane pump for wastewater that can obtain maximum efficiency and passable solids size according to the lift, and a tube-vane pump for wastewater designed accordingly.

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.

The configuration of the present invention for achieving the above object is a method for designing a tube-in pump for wastewater, comprising: a) setting an objective function; b) setting design parameters of the impeller and the volute for deriving the set objective function; c) deriving the value of the objective function according to the set value of the design variable through numerical analysis; d) deriving a 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 e) provides a 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 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 includes: a first variable that is a y-axis displacement of one end of the impeller located on the inlet side of the wastewater pump; a second variable that is a y-axis displacement of the other end of the impeller; and a third variable of a cross-sectional area according to the volute angle of the volute.

In the embodiment of the present invention, in the step c), the shape of the impeller and the volute formed according to the values of the first variable, the second variable, and the third variable, in a state where the meridian surface of the tube vane pump is fixed the value of the objective function can be characterized and adapted to be derived by the 2 ^K factor experiments.

(여기서, x₁은 제1 변수, x₂는 제2 변수, x₃은 제3 변수)인 것을 특징으로 할 수 있다.In an embodiment of the present invention, in step e), the function formula derived for the head is,

(Here, x ₁ is a first variable, x ₂ is a second variable, and x ₃ is a third variable).

(여기서, x₁은 제1 변수, x₂는 제2 변수, x₃은 제3 변수)인 것을 특징으로 할 수 있다.In an embodiment of the present invention, in step e), the function formula derived for the efficiency is,

(Here, x ₁ is a first variable, x ₂ is a second variable, and x ₃ is a third variable).

(여기서, x₁은 제1 변수, x₂는 제2 변수, x₃은 제3 변수)인 것을 특징으로 할 수 있다.In an embodiment of the present invention, in step e), the function formula derived for the maximum passable solid volume is,

(Here, x ₁ is a first variable, x ₂ is a second variable, and x ₃ is a third variable).

In an embodiment of the present invention, the third variable may be characterized in that the maximum cross-sectional area of the volute is expressed as a ratio of the cross-sectional area to the cross-sectional area at a volute angle of 360 degrees.

In an embodiment of the present invention, the ranges of the first variable, the second variable, and the third variable are secondary indicating the change in the objective function value for the lift and efficiency of the pump according to each of the design variable values. It may be characterized in that it is set to include an inflection point in the function graph.

In an embodiment of the present invention, in the step e), the design variable such that at least one of the pump efficiency and the maximum passable solid volume becomes the maximum while the design objective function value of the head among the objective functions is fixed. It may be characterized in that it is provided to derive the value of the design plan.

In the two vane pump for wastewater designed according to the design method of the two vane pump for wastewater, the configuration of the present invention for achieving the above object is a pair of impellers that are formed to extend outwardly from the pump inlet in a streamlined manner and are symmetrical to each other ; and a volute in which the impeller is provided.

In an embodiment of the present invention, the positions of both ends of the impeller are designed according to the first and second variables according to the design, and the volute according to the third variable according to the design and the volute angle It may be characterized in that the cross-sectional area is designed.

In an embodiment of the present invention, the volute may be designed so that the cross-sectional area gradually increases from the inlet side to the outlet side.

In an embodiment of the present invention, when the two vane pump for wastewater is a 2.2kw pump, the width of the outlet side of the volute is 80mm, and the length from the center of the inlet to the end of the volute outlet is fixed to 200mm, , it may be characterized in that the height of the volute is formed within 300mm.

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 pumping efficiency.

In addition, it is possible to conveniently design a two-vane pump having a desired target specification by using the design plan derived according to the optimal design method of the present invention.

In particular, it is possible to design a two-vane pump with maximum efficiency and passable solids size at the targeted head.

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 design method of a tube-in pump for wastewater according to an embodiment of the present invention.
Figure 2 is an exemplary view of the tube vane pump for waste water according to an embodiment of the present invention.
Figure 3 is an exemplary view of the tube vane pump impeller for waste water according to an embodiment of the present invention
4 is a graph showing the lift and efficiency according to the flow rate ratio according to an embodiment of the present invention.
5 is a cross-sectional view taken along line AA′ of FIG. 3 according to an embodiment of the present invention.
6 is an exemplary view showing a point set as a design parameter of the impeller according to an embodiment of the present invention.
7 is an exemplary diagram illustrating design parameters of a volute according to an embodiment of the present invention.
8 is a graph showing a change in head according to a change in the value of each design variable according to an embodiment of the present invention.
9 is a graph showing a change in efficiency according to a change in the value of each design variable according to an embodiment of the present invention.
10 is a graph showing the change in the maximum volume of solids that can pass according to the change in the value of each design variable according to an embodiment of the present invention.
11 is a graph showing the values of the objective function according to the values of the design variables when deriving a design plan with maximum efficiency according to an embodiment of the present invention.
12 is a graph showing the value of the objective function according to the value of the design variable when deriving a design plan that maximizes the efficiency and the maximum passable solid volume according to an embodiment of the present invention.
13 is an exemplary view of a conventional general two-vane pump.
14 is an exemplary view showing a tube-in pump for wastewater designed to maximize efficiency by a design method according to an embodiment of the present invention at a target lift.
15 is an exemplary diagram illustrating a tube-in pump for wastewater in which both efficiency and maximum passable solids volume are maximally designed by the design method according to an embodiment of the present invention at the target lift.

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.

Figure 1 is a flowchart of a design method of a tube vane pump for wastewater according to an embodiment of the present invention, Figure 2 is an exemplary view of a tube vane pump for wastewater according to an embodiment of the present invention, Figure 3 is the present invention It is an exemplary view of the tube vane pump impeller for wastewater according to an embodiment.

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

The two vane pump 100 for wastewater of the present invention includes a pair of impellers 110 and 120 and a volute 130 .

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 volute 200 in a streamlined curve from the inlet 110 . In this case, the impellers 110 and 120 may be formed to extend to form a curve so that the inlet 130 side surface is concave.

The volute 200 includes a hub 210 and a shroud 220, and may be provided to form a casing accommodating the impellers 110 and 120 therein.

And, the volute 200 is formed so that the cross-sectional area gradually increases from the inlet side toward the outlet side.

In the present invention, the two vane pump 100 for wastewater is a 2.2 kW pump, and the width W of the outlet of the volute 200 is 80 mm, from the center of the inlet 130 to the end of the outlet of the volute 200. The length L is fixed to 200 mm, and the height H of the volute 200 is formed within 300 mm.

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.

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

Referring to FIG. 4 , the two vane pump 100 for wastewater does not have 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 ratio, the efficiency increases as the flow ratio increases, and then it has a two-dimensional curve that decreases at a certain point.

In addition, when only the head and the 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 for wastewater 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 parameters of the impeller and the volute for deriving the set objective function ( S20 ) may be performed.

In the step of setting design parameters of the impeller and the volute for deriving the set objective function (S20), the design variables are used with the impeller in order to consider the interaction between the impellers 110 and 120 and the volute 200. It may consist of design parameters set for the volute.

5 is a cross-sectional view taken along line A-A' of FIG. 3 according to an embodiment of the present invention.

Referring to FIG. 5 , in the step of setting the design parameters of the impeller and the volute for deriving the set objective function ( S20 ), the design parameters of the present invention are a first variable, a second variable, and a third variable. It was set to three.

In the present invention, the case of optimal design with three design variables having the greatest influence on the set objective function has been described, but the number of design variables is not limited thereto, and the number of design variables may be changed.

6 is an exemplary view showing a point set as a design parameter of the impeller according to an embodiment of the present invention.

Referring to FIG. 6 , 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.

And, the second variable refers to the y-axis displacement of the second point 12 located at the other end of the impellers 110 and 120 .

Here, the first variable has the greatest influence on the size and efficiency of passable solids among the shapes of the impeller, and the second variable is selected because it has the greatest influence on the lift among the shapes of the impeller.

7 is an exemplary diagram illustrating design parameters of a volute according to an embodiment of the present invention.

Referring to FIG. 7 , the third variable refers to a ratio of a cross-sectional area to a maximum cross-sectional area at a 360 degree point of the volute 200 of the volute 200 .

Specifically, the volute 200 is extended to surround the outer peripheral surface of the impeller, and the cross-sectional area is gradually increased from 0 degrees to 360 degrees in FIG. 7 . In this case, the third variable may represent the size of the cross-sectional area of the volute 200 as a percentage compared to the cross-sectional area of the volute 200 initially set at a point of 360 degrees where the cross-sectional area is the largest. For example, when the initially set arbitrary volute cross-sectional area is 100 mm ² and the third variable is 80%, the optimally designed volute cross-sectional area is 80 mm ² .

The third variable was set as the volute cross-sectional area because the relationship between the impeller outlet side and the volute cross-sectional area is important when designing the impeller and the volute.

In the step of setting design parameters of the impeller and volute for deriving the set objective function ( S20 ), it may be further provided to set the maximum and minimum value ranges for each design variable.

The first variable may be set to be changeable within the range of -3.36359% to 3.36359% of the entire length of the impellers 110 and 120 at the initially set first point 11 .

The second variable may be set to be changeable within the range of -7.04538% to 3.04538% of the entire length of the impellers 110 and 120 at the initially set second point 12 .

The third variable may be set to be changeable within the range of 73.182% to 106.818% in any initially set volute cross-sectional area.

The maximum and minimum ranges of the first to third variables are not limited to one embodiment, and the range is preferably set so that the inflection point of the quadratic function is included within the range.

After the step (S20) of setting the design parameters of the impeller and the volute for deriving the set objective function, the step (S30) of deriving the value of the objective function according to the value of the set design variable through numerical analysis may be performed. have.

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, two variables, it is possible to be adapted to derived by the value of the objective function for the shape of the impeller (110, 120) and the volute 200 is formed in accordance with the value of the third variable in the 2 ^K factor experiments.

Experimental example first variable
(%) second variable
(%) third variable
(%) One -2 -5 80 2 2 -5 80 3 -2 One 80 4 2 One 80 5 -2 -5 100 6 2 -5 100 7 -2 One 100 8 2 One 100 9 -3.36359 -2 90 10 3.36359 -2 90 11 0 -7.04538 90 12 0 3.04538 90 13 0 -2 73.182 14 0 -2 106.818 15 0 -2 90

As shown in Table 1, in the present invention, ^{the values of the first variable, the second variable, and the third variable are changed according to the 2 k} factor experiment, and the impeller and volute shapes are virtually designed, and the objective function value is derived at this time. did

8 is a graph showing a change in head according to a change in the value of each design variable according to an embodiment of the present invention, and FIG. 9 is a graph showing efficiency according to a change in the value of each design variable according to an embodiment of the present invention. It is a graph showing the change, and FIG. 10 is a graph showing the change in the maximum volume of solids that can pass according to the change in the value of each design variable according to an embodiment of the present invention.

8 to 10 , a change in the objective function according to the value of each design variable may be derived according to the shape of the impeller and the volute derived according to the ^{2k factor experiment.}

8 to 10 , it can be seen that the value of each objective function tends to increase or decrease as the value of each design variable increases.

In addition, as shown in FIG. 8 , the values of the values of the design variables according to the shapes of the impeller and the volute are preferably set so that the quadratic function graph for the lift and the efficiency according to the design variables includes the inflection point.

In general, the maximum size of solids that can pass through continues to increase as the value of the design variable increases in the direction in which the cross-sectional area increases, but the lift and efficiency decrease or increase as the cross-sectional area increases. Accordingly, the first variable, the second variable, and the third variable may enable each quadratic function graph showing the change of the objective function according to the value of the design variable to include the inflection point to derive the maximum head value or the maximum efficiency value. .

After the step of deriving the value of the objective function according to the value of the set design variable through numerical analysis (S30), a function expression for deriving the value of the objective function is obtained by using the value of the objective function according to the value of the derived design variable. A deriving step ( S40 ) may be performed.

11 is a graph showing the value of the objective function according to the value of the design variable when deriving the design plan with the maximum efficiency according to an embodiment of the present invention, and FIG. 12 is the efficiency and passable solids according to an embodiment of the present invention It is a graph showing the value of the objective function according to the value of the design variable when the design plan with the maximum volume is drawn up.

11 and 12, in the step of deriving a function formula for deriving the value of the objective function by using the value of the objective function according to the value of the derived design variable (S40), it is derived according to the ^{2k factor experiment} The graph shown can be derived through regression analysis of the change of the objective function according to the value of the designed design variable, and a function expression using the design variable as an unknown variable can be derived from the above graph.

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 the first variable, x ₂ is the second variable, and x ₃ is the value of the third variable.

After the step of deriving a 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 (S40), the design variable that satisfies the value of the design objective function using the derived function expression A step (S50) of deriving a value into a design plan may be performed.

In the step (S50) of deriving the value of the design variable that satisfies the design objective function value as a design plan using the derived function formula, the target design objective function value is calculated using Equations 2, 3, and 4 above. It may be provided to derive the design parameters that are satisfied with the design of the impellers 110 and 120 and the volute 200 .

lift
(m) efficiency
(%) Maximum volume of solids that can pass through
(mm ² ) prior art 12 55 8,181 Example 1 11.9 77 4,189 Example 2 12.2 74 8,181

13 is an exemplary view of a conventional general two vane pump, and FIG. 14 is an exemplary view showing a two vane pump for wastewater designed to maximize efficiency by a design method according to an embodiment of the present invention at a target lift, 15 is an exemplary diagram illustrating a tube-in pump for wastewater in which both efficiency and maximum passable solids volume are maximally designed by the design method according to an embodiment of the present invention at the target lift.

Referring to FIG. 13 , in the wastewater pump of the prior art, when the head is set to 12m, the maximum volume of solids that can pass through the efficiency of 55% is 8,181mm ² .

Example 1 was designed to maximize the efficiency when the head is 12, as shown in FIG. 11 . At this time, referring to Table 2, Example 1 has an efficiency of 77%, and it can be confirmed that the efficiency is increased by 22% compared to the conventional example.

In Example 2, as shown in FIG. 12, when the head is 12, both the efficiency and the maximum volume of solids that can pass through are designed to be the maximum. At this time, looking at Table 2, Example 2 has an efficiency of 74% and a maximum passable solid volume of 8,181 mm ² , which greatly increases the efficiency compared to the conventional example, and it can be confirmed that the passable solids maximum volume is maintained the same.

As such, in the present invention, in a state in which a head is designated, a desired optimal design can be derived by deriving design variables such that any one or more of efficiency and the maximum volume of solids that can pass through is maximized.

As such, the optimally designed present invention can pass solids of a desired size in the same head as compared to the conventional tube-vane pump for wastewater, as well as design with higher efficiency.

In addition, according to the present invention, it is possible to prevent failure and damage and to have high pumping efficiency by pumping manure, wastewater, filth, and solids 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. In other words, when a desired specification is input, the optimal design variable value is automatically derived by calculating what percentage values of the first variable, second variable, and third variable should be located in the basic input shape in order to reach the desired specification. can be provided.

The description of the present invention described above 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: two vane pump for wastewater
110, 120: impeller
130: inlet
200: volute
210: hub
220: shroud

Claims (15)

In the design method of the two vane pump for wastewater,
a) setting an objective function;
b) setting design parameters of the impeller and the volute for deriving the set objective function;
c) deriving the value of the objective function according to the set value of the design variable through numerical analysis;
d) deriving a 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
e) deriving the value of the design variable that satisfies the design objective function value as a design plan using the derived function formula;
In step b), the design variable may include: a first variable that is a y-axis displacement of one end of the impeller located on the inlet side of the wastewater pump; a second variable that is a y-axis displacement of the other end of the impeller; and a third variable of a cross-sectional area according to the volute angle of the volute,
The third variable is a method of designing a two-vane pump for wastewater, characterized in that the ratio of the cross-sectional area to the cross-sectional area at the 360 degree point of the volute angle is the maximum cross-sectional area of the volute.
The method of claim 1,
In step a),
The objective function is
A method of designing a tube-in pump for wastewater, characterized in that it is the maximum volume of solids that can pass through with lift, efficiency, and volume.
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 a design method of a two vane pump for wastewater, characterized in that the length of the tangential direction from the end of the pump inlet of the impeller to the impeller facing.
delete The method of claim 1,
Step c) is,
In the state in which the meridian surface of the tube vane pump is fixed,
Design of wastewater to-vane pump, characterized in that the first variable, the value of the objective function for the shape of the impeller and the volute formed in accordance with the second variable, the value of the third variable, and adapted to be derived by the 2 ^K factor experiment Way.
3. The method of claim 2,
In step e),
The 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)
A design method of a two vane pump for wastewater, characterized in that
3. The method of claim 2,
In step e),
The 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)
A design method of a two vane pump for wastewater, characterized in that
3. The method of claim 2,
In step e),
The 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)
A design method of a two vane pump for wastewater, characterized in that
delete The method of claim 1,
The range of the first variable, the second variable and the third variable is,
A method of designing a two-vane pump for wastewater, characterized in that it is set to include an inflection point in the quadratic function graph showing the change in the objective function value for the pump head and efficiency according to each of the design variable values.
The method of claim 1,
Step e) is,
Waste water, characterized in that it is provided to derive the value of the design variable that makes at least one of pump efficiency and the maximum volume of solids that can pass through the maximum in a state in which the value of the design objective function of the head is fixed in the design plan Design method of tube-in pump.
In the tube vane pump for wastewater designed according to the design method of the tube vane pump for wastewater according to claim 1,
A pair of impellers extending outward from the inlet of the pump in a streamlined manner and symmetrical to each other; and
A two vane pump for wastewater, characterized in that it includes a volute having the impeller provided therein.
13. The method of claim 12,
The position of both ends of the impeller is designed according to the first variable and the second variable according to the design,
The tube vane pump for wastewater, characterized in that the volute has a cross-sectional area designed according to the volute angle according to the third variable according to the design proposal.
14. The method of claim 13,
The two vane pump for wastewater, characterized in that the volute is designed to gradually increase the cross-sectional area from the inlet side to the outlet side.
15. The method of claim 14,
When the two vane pump for wastewater is a 2.2kw pump,
The tube-vane pump for wastewater, characterized in that the width of the outlet of the volute is 80 mm, the length from the center of the inlet to the end of the outlet of the volute is fixed to 200 mm, and the height of the volute is formed within 300 mm.

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