KR20210093411A - Suction guide apparatus for underwater pump - Google Patents

Abstract

The present invention relates to a suction guide apparatus for an underwater pump, which has a structure including a suction guide connected to a pump fixed to a seat of a column pipe, is easy to install regardless of the installation conditions on site, and can reduce head loss with a wide suction starting point and help forming a stable flow path in the process of sucking fluid from the ground.

Description

Suction guide device for submersible pumps {SUCTION GUIDE APPARATUS FOR UNDERWATER PUMP}

The present invention relates to a suction guide device for a submersible pump, and more particularly, to a suction guide device for a submersible pump for application to a column pipe having a built-in submersible pump.

In general, drainage pumping stations are installed in underpasses, common pits, and underpasses, so that if groundwater or rainwater flows in, it can be drained quickly.

Such a drainage pump station is a concrete structure that is installed underground, such as an underpass, and is installed for the purpose of preventing flooding due to the inflow of leaking groundwater or the inflow of rainwater in the case of rain depending on the groundwater pressure of the surrounding environment of the underground structure, the degree of waterproofing of the civil structure, etc. do.

The forced drainage method of a general drainage pump station has a structure in which a vibration damper is installed on the inflow path through which water flows, a water collecting tank behind the vibration damper, and a drainage pump that pumps water stored in the water collection tank into the drainage passage is applied.

The drain pump is installed inside the column pipe fixed through the upper wall of the water collecting tank, the inlet of the column pipe is installed near the bottom of the water collecting tank, and the drain pump is installed at the inlet side of the column pipe.

In the conventional drainage pump including "Nurture solution pump and nutrient solution pump system" of Japanese Patent Laid-Open Publication No. 2009-197648, a waterproof-treated sealed motor is provided on the upper portion, and the rotating shaft extends downwardly on the central side of the motor.

In addition, a pump casing that is fixed to the inlet of the column pipe to support the motor is provided on the lower side of the motor.

The drain pump configured as described above sucks the fluid through the suction port of the casing while the impeller rotates by the rotational force of the motor and discharges the fluid through the discharge port, thereby forcing the fluid to flow.

The conventional pump system including such a drain pump has a structure in which the seat 20 is disposed at the lower end of the column pipe 10 and the pump 30 is seated on the seat 20 as shown in FIG. has been

However, in such a conventional pump system, when the pump is operated for suction of fluid, that is, a vortex phenomenon occurs as shown.

The vortex phenomenon generated at the lower side of the seat 20 causes a loss head, which is adversely affected depending on the discharge diameter (A) of the pump 30, power consumption (kW), total lift (m), etc. of the pump 30 . will be.

As a result, as the head loss value increases, the efficiency of the pump also decreases.

In some cases, a suction guide device (hereinafter not shown) is fixed to the ground 40 in order to improve the suction condition of the fluid, but when separating to replace or repair the column pipe 10 or the pump 30, Alternatively, when the water storage tank whose bottom surface is the ground 40 is full, there is also a problem that interferes with the replacement construction.

Japanese Patent Laid-Open No. 2009-197648

The present invention was invented to improve the above problems, and is to provide a suction guide device for a submersible pump that is easy to install regardless of installation conditions in the field.

And, an object of the present invention is to provide a suction guide device for a submersible pump that has a wide suction start point and can reduce head loss.

Another object of the present invention is to provide a suction guide device for a submersible pump that can help to form a stable flow path in the process of sucking a fluid from the ground.

In order to achieve the above object, the present invention is perpendicular to the ground and the lower end of the column pipe (column pipe) disposed spaced apart from the ground; a ring-shaped sheet provided on an inner circumferential surface of a lower side of the column pipe; a pump seated and fixed to the seat; and a suction guide mounted on the lower end of the column pipe to be connected to the suction side provided at the lower end of the pump, and forming an inner flow path whose diameter is gradually reduced toward the upper side, wherein the suction guide is from the ground to the pump. By shortening the suction time point at which the fluid is sucked into the suction side of the column pipe, as the fluid is sucked from the lower end of the column pipe, a vortex is prevented from occurring around the lower end of the column pipe, and at the same time, the inside of the suction guide A suction guide device for a submersible pump, characterized in that the vortex of the fluid sucked to the suction side of the pump is prevented, and the suction point is the length of an imaginary line extending vertically from the ground to the center of the suction side of the lower end of the pump. can provide

Here, the suction guide is connected to a suction port having a first diameter formed at the lower end of the pump, fixed to the lower side of the seat, a connection hole having the first diameter, and exposed outside the lower end of the column pipe The guide body formed in the shape of a bell mouth for connecting external suction holes having a third diameter larger than the first diameter to each other, and the guide body formed on the inner circumferential surface of the guide body and flowing into the guide body and a vortex prevention part for regulating the generation of vortex of the fluid, wherein the connection hole and the external suction hole are parallel to the ground.

At this time, the vortex prevention part, it is characterized in that it is formed in a plurality of guide wings spaced apart from the inner peripheral surface of the guide body, the guide wings are radially arranged at equal intervals on the inner peripheral surface of the guide body.

In addition, the vortex prevention part, which protrudes from the inner circumferential surface of the guide body toward the center of the guide body, forms an upper end edge disposed on the same plane as the connection hole, and a first edge parallel to the ground; A second edge extending downward from the first edge and inclined to form an acute angle with respect to the first edge, a third edge inclinedly extending from the second edge to the external suction hole, and the external suction from the third edge A wing body including a fourth edge extending in parallel with the first edge to the edge of the hole, a first curved connecting part connecting the distal end of the first edge and the upper end of the second edge in a round manner, and the second edge and a second curved connection part connecting the lower end of the lower end and the upper end of the third edge in a round manner, wherein the wing body is arranged in plurality on the inner circumferential surface of the guide body.

In addition, the length of the wing body protruding from the inner circumferential surface of the guide body is preferably 50% to 90% of the inner diameter of the guide body.

According to the present invention having the configuration as described above, the following effects can be achieved.

First, the present invention is perpendicular to the ground and the lower end is disposed spaced apart from the ground column pipe (column pipe); a ring-shaped sheet provided on the inner circumferential surface of the lower side of the column pipe; seat-mounted pump; and a suction guide mounted on the lower end of the column pipe so as to be connected to the suction side provided at the lower end of the pump, and forming an inner flow path whose diameter is gradually reduced toward the upper side, wherein the suction guide moves the fluid from the ground to the suction side of the pump. By shortening the point of time when the suction is sucked in, it prevents a vortex from occurring around the lower end of the column pipe as the fluid is sucked from the lower end of the column pipe, and at the same time, the vortex of the fluid sucked from the inside of the suction guide to the suction side of the pump. It is characterized in that the point of suction is the length of the virtual line extending vertically from the ground to the center of the suction side of the lower part of the pump. has the effect of being able to do it.

In particular, the present invention has the advantage of having a suction point of a large area compared to the inner diameter of the column pipe and reducing the head loss to prevent a decrease in the efficiency of the pump in advance.

Above all, since the present invention enables the formation of a stable flow path in the process of sucking the fluid by the suction guide, it will be possible to help increase the efficiency of the pump by minimizing or preventing the generation of vortex that increases the head loss.

And, the suction guide according to the present invention is connected to a suction port having a first diameter formed at the lower end of the pump, fixed to the lower side of the seat, a connection hole having a first diameter, and exposed to the outside of the lower end of the column pipe A guide body formed in the shape of a bell mouth that connects external suction holes having a third diameter larger than the first diameter, and a vortex of fluid flowing into the guide body formed on the inner circumferential surface of the guide body It includes a vortex prevention part that regulates, and the connection hole and the external suction hole are formed parallel to the ground, so that there is a risk of volute phenomenon due to the high flow rate in the suction section compared to the existing pump system without a suction guide and it will be possible to form a stable flow path by preventing volute in advance thanks to the relatively slow flow rate because the fluid is sucked from the external suction hole with a larger diameter than the column pipe.

In addition, the vortex prevention unit according to the present invention includes a plurality of guide wings formed and spaced apart from the inner circumferential surface of the guide body, and the guide wings are radially arranged at equal intervals on the inner circumferential surface of the guide body, thereby preventing the vortex inside the guide body. It will be possible to help form a stable flow path by grinding.

In addition, the vortex prevention part according to the present invention, which protrudes from the inner circumferential surface of the guide body toward the center of the guide body, forms an upper end edge disposed on the same plane as the connection hole, a first edge parallel to the ground, and a first a second edge extending downward from the edge and inclined to form an acute angle with respect to the first edge, a third edge inclinedly extending from the second edge to the external suction hole, and a first edge from the third edge to the edge of the external suction hole; A wing body including a fourth edge extending in parallel, a first curved connecting portion connecting the distal end of the first edge and the upper end of the second edge in a round manner, and a lower end of the second edge and an upper end of the third edge being rounded It includes a second curved connecting portion for connecting, and the wing body is arranged in plurality on the inner circumferential surface of the guide body, thereby minimizing the head loss and forming a stable flow path in which the vortex generation is minimized.

In addition, according to the present invention, the length of the wing body protruding from the inner circumferential surface of the guide body is made to be 50% to 90% of the inner diameter of the guide body, so that it is stable without interfering with the flow of the fluid sucked through the external suction hole And it will be possible to prevent the occurrence of eddy currents in advance through the formation of a uniform flow path.

1 is a conceptual diagram comparing a conventional pump system and a suction guide device for a submersible pump according to an embodiment of the present invention, FIG. 1 (a) is a conventional pump system, and FIG. 1 (b) is a diagram illustrating the present invention One part side cross-section schematic
Figure 2 is a side cross-sectional conceptual view showing the internal structure of the suction guide, which is a main part of the suction guide device for a submersible pump according to an embodiment of the present invention;
FIG. 3 is a conceptual plan view showing a suction guide, which is a main part of a suction guide device for a submersible pump according to an embodiment of the present invention, as viewed from a point III of FIG. 2 .
Figure 4 is a side cross-sectional conceptual view showing a system in which a suction guide device for a submersible pump according to an embodiment of the present invention is installed;

Advantages and features of the present invention, and methods for achieving them, will become apparent with reference to the embodiments described below in detail in conjunction with the accompanying drawings.

However, the present invention is not limited to the embodiments disclosed below, but will be implemented in various different forms.

In the present specification, the present embodiment is provided so that the disclosure of the present invention is complete, and to fully inform those of ordinary skill in the art to which the present invention pertains to the scope of the present invention.

And the invention is only defined by the scope of the claims.

Accordingly, in some embodiments, well-known components, well-known operations, and well-known techniques have not been specifically described to avoid obscuring the present invention.

In addition, like reference numerals refer to like elements throughout the specification, and terms used (referred to) herein are for the purpose of describing the embodiments and are not intended to limit the present invention.

In this specification, the singular also includes the plural unless specifically stated otherwise in the phrase, and elements and operations referred to as 'comprising (or having)' do not exclude the presence or addition of one or more other elements and operations. .

Unless otherwise defined, all terms (including technical and scientific terms) used herein may be used with the meaning commonly understood by those of ordinary skill in the art to which the present invention belongs.

Also, terms defined in commonly used dictionary are not to be interpreted ideally or excessively unless defined.

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

For reference, Figure 1 is a conceptual diagram comparing a conventional pump system and a suction guide device for a submersible pump according to an embodiment of the present invention, Figure 1 (a) is a conventional pump system, Figure 1 (b) is this view It is a partial side cross-sectional conceptual view showing the invention.

And, FIG. 2 is a schematic cross-sectional side view showing the internal structure of the suction guide 50, which is a main part of the suction guide device for a submersible pump according to an embodiment of the present invention, and FIG. 3 is a view taken from the III point of FIG. It is a plan conceptual view showing the suction guide 50, which is a main part of the suction guide device for a submersible pump according to an embodiment of the present invention.

In addition, Figure 4 is a side cross-sectional conceptual view showing a system in which a suction guide device for a submersible pump according to an embodiment of the present invention is installed.

First, it can be understood that the present invention has a structure including a suction guide 50 connected and mounted to a pump 30 fixed to a seat 20 of a column pipe 10 as shown.

The column pipe 10 is perpendicular to the ground 40 and the lower end thereof is spaced apart from the ground 40 , and is seated and fixed on a ring-shaped seat 20 provided on the inner circumferential surface of the lower side of the column pipe 10 . (30) is to form the discharge flow path.

The suction guide 50 is mounted at the lower end of the column pipe 10 to be connected to the suction side provided at the lower end of the pump 30 , and forms an internal flow path whose diameter is gradually reduced toward the upper side.

The suction guide 50 shortens the suction point at which the fluid is sucked from the ground 40 to the suction side of the pump 30 , so that as the fluid is sucked from the lower end of the column pipe 10 , the At the same time as preventing the vortex from occurring around the lower end, the vortex of the fluid sucked from the inside of the suction guide 50 to the suction side of the pump 30 is prevented.

Here, the suction point refers to the length of the virtual line extending from the ground 40 to the center of the suction side of the lower end of the pump 30 vertically.

At this time, shortening the suction point is compared to the suction point (Q1, see Fig. 1 (a)) of the existing pump 30 built-in column pipe 10 to which the suction guide 50 is not attached, the suction guide ( By attaching 50), it means that the suction point (Q2, see FIG. 1(b)) from the ground 40 is shortened.

It goes without saying that the present invention can be applied to the above-described embodiments, and can also be applied to the following various embodiments.

First, the seat 20 includes a ring-shaped seating rib 21 formed along the inner circumferential surface of the lower side of the column pipe 10 , and a plurality of seat ribs mounted on the seating rib 21 to form an inner circumferential surface of the column pipe 10 and It may include a fixed rib 22 to be connected.

Here, the pump 30 may be fixed by being welded to the fixing rib 22 .

On the other hand, the pump 30 has a pump body 31 having a lower end that is seated and fixed on the seat 20 , an internal suction flow path 32 formed inside the pump body 31 , and a fixing ear 33 , fixing It can be seen that the structure includes an ear).

The internal suction passage 32 includes a suction port 32a having a first diameter D1 formed at the lower end of the pump body 31 and a second smaller diameter D1 than the first diameter D1 formed at the upper end of the pump body 31 . By connecting the discharge ports 32b having a diameter D2 to each other, they are formed in the shape of a bell mouth.

A plurality of fixed ears 33 are formed on the outer circumferential surface of the pump body 31 , are mounted on the upper side of the seat 20 in plurality, and are welded to a fixed rib 22 connected to the inner circumferential surface of the column pipe 10 . .

On the other hand, it can be understood that the suction guide 50 has a structure including the vortex prevention part 60 formed inside the guide body 51 .

Here, the guide body 51 is connected to the suction port 32a having a first diameter D1 formed at the lower end of the pump 30 and is fixed to the lower side of the seat 20 and has a first diameter D1. A bell mouth connecting the connection hole 51a and the external suction hole 51b exposed to the outside of the lower end of the column pipe 10 and having a third diameter D3 larger than the first diameter D1 to each other. ) is formed in the shape of

At this time, it can be seen that the connection hole 51a and the external suction hole 51b are parallel to the ground 40 .

In addition, the vortex prevention unit 60 is formed on the inner circumferential surface of the guide body 51 to regulate the occurrence of a vortex of the fluid flowing into the guide body 51 .

The guide body 51 is formed in the shape of a bell mouth, that is, a trumpet shape, in which the diameter gradually increases toward the lower end as a whole.

That is, the inner circumferential surface of the guide body 51 may be formed in a soft curved shape such that the diameter gradually increases toward the lower side as a whole.

Here, the inner diameter of the column pipe 10 may be equal to or smaller than the third diameter D3 and may have a fourth diameter D4 greater than the first diameter D1.

Accordingly, the guide body 51 is connected to the lower end of the seat 20 and the suction port 32a of the pump 30 , and the outer peripheral surface of the guide body 51 is in line contact with the lower end edge of the column pipe 10 . Alternatively, it may be fixed by welding by surface contact.

On the other hand, the vortex prevention unit 60 is formed on the inner circumferential surface of the guide body 51 and includes a plurality of guide wings 61 spaced apart, and the guide wings 61 are radially on the inner circumferential surface of the guide body 51 . They may be arranged at equal intervals.

The guide wing 61 may include a wing body 61 protruding from the inner circumferential surface of the guide body 51 toward the center of the guide body 51 .

2 , the wing body 61 protrudes from the inner circumferential surface of the guide body 51 toward the center of the guide body 51 , and forms an upper edge disposed on the same plane as the connection hole 51a. And it may include a first edge (61a) parallel to the ground (40).

The wing body 61 may include a second edge 61b extending downward from the first edge 61a and inclined to form an acute angle with respect to the first edge 61a.

The wing body 61 may include a third edge 61c obliquely extending from the second edge 61b to the external suction hole 51b.

The wing body 61 may include a fourth edge 61d extending in parallel with the first edge 61a from the third edge 61c to the edge of the external suction hole 51b to form a lower edge edge. .

The wing body 61 includes a first curved connecting portion 62a that roundly connects the distal end of the first edge 61a and the upper end of the second edge 61b, and the lower end and the third edge of the second edge 61b. It may include a second curved connecting portion (62b) for connecting the upper end of the (61c) round.

The wing body 61 may be arranged in plurality on the inner circumferential surface of the guide body 51 as shown in FIG. 3 .

The shape of the wing body 61 as described above is formed as a water channel is formed from a wide external suction hole 51b such as a trumpet shape to a narrow connection hole 51a side. It can be said that it is an optimal structure prepared to prevent eddy currents.

At this time, the length (H) of the wing body 61 protruding from the inner circumferential surface of the guide body 51 is preferably 50% to 90% of the inner diameter (R) of the guide body 51 .

The length H at which the wing body 61 protrudes is the inner diameter R of the guide body 51 so as not to interfere with the flow of fluid flowing in from the external suction hole 51b formed at the lower end of the guide body 51 . ) may be designed to be about 50% to 90%, more preferably about 70%.

Therefore, in the present invention, as shown in FIG. 4 , in a water storage tank or a drainage pumping station with the ground 40 as the bottom surface, the vortex flow is caused by the suction guide 50 that is naturally connected to the lower end of the pump 30 built in the column pipe 10 . It will be possible to prevent a decrease in pump efficiency by forming a stable suction flow path that minimizes the head loss without any occurrence.

Hereinafter, the operation and effect of the suction guide device for a submersible pump according to a preferred embodiment of the present invention will be looked at as follows.

First, the present invention is perpendicular to the ground (40) and the lower end of the column pipe (10) disposed spaced apart from the ground (40); a ring-shaped seat 20 provided on the inner peripheral surface of the lower side of the column pipe 10; a pump 30 seated and fixed to the seat 20; and a suction guide 50 that is mounted on the lower end of the column pipe 10 so as to be connected to the suction side provided at the lower end of the pump 30 and forms an internal flow path whose diameter is gradually reduced toward the upper side, the suction guide 50 shortens the suction time point at which the fluid is sucked from the ground 40 to the suction side of the pump 30 , so that as the fluid is sucked from the lower end of the column pipe 10 , the vortex around the lower end of the column pipe 10 . At the same time, it prevents the occurrence of a vortex of the fluid sucked from the inside of the suction guide 50 to the suction side of the pump 30, and the suction point is perpendicular to the ground 40 from the bottom of the pump 30 It is characterized in that it is the length of the virtual line extended to the center of the suction side, so it is easy to install regardless of the installation conditions on the site, so it has the effect of significantly improving the convenience of work.

In particular, the present invention has a feature that can prevent a decrease in the efficiency of the pump 30 in advance by reducing the head loss by having a suction point of a larger area compared to the inner diameter of the column pipe 10 .

Above all, since the present invention enables the formation of a stable flow path in the process of sucking the fluid by the suction guide 50, it helps to increase the efficiency of the pump 30 by minimizing or preventing the generation of vortex that increases the head loss. will be able to give

And, the suction guide 50 according to the present invention is connected to the suction port 32a having a first diameter D1 formed at the lower end of the pump 30 and is fixed to the lower side of the seat 20 and has a first diameter Connecting the connection hole 51a having (D1) and the external suction hole 51b having a third diameter (D3) larger than the first diameter (D1) exposed to the outside of the lower end of the column pipe 10 to each other The guide body 51 formed in the shape of a bell mouth, and the vortex prevention part 60 formed on the inner circumferential surface of the guide body 51 to regulate the vortex generation of the fluid flowing into the guide body 51 . Including, the connection hole (51a) and the external suction hole (51b) is formed parallel to the ground (40), compared to the existing pump system without the suction guide 50, the ball due to the high flow rate in the suction section A stable flow path by eliminating concerns about the occurrence of a volute phenomenon and by preventing the occurrence of volute in advance thanks to a relatively slow flow rate because the fluid is sucked from the external suction hole 51b having a larger diameter than the column pipe 10 formation will be possible.

In addition, the vortex prevention unit 60 according to the present invention includes a plurality of guide wings 61 formed on the inner circumferential surface of the guide body 51 and spaced apart from each other, and the guide wings 61 are of the guide body 51 . By disposing at equal intervals radially on the inner circumferential surface, it will be possible to pulverize the vortex inside the guide body 51 to help form a stable flow path.

In addition, the vortex prevention part 60 according to the present invention is protruding from the inner circumferential surface of the guide body 51 toward the center of the guide body 51, and the edge of the upper end disposed on the same plane as the connection hole 51a. a first edge 61a parallel to the ground 40 and a second edge 61b extending downward from the first edge 61a and inclined to form an acute angle with respect to the first edge 61a; 2 A third edge 61c obliquely extending from the edge 61b to the external suction hole 51b, and extending parallel to the first edge 61a from the third edge 61c to the edge of the external suction hole 51b A wing body 61 including a fourth edge 61d that is formed to form a lower edge, and a first curved connecting portion 62a that connects the distal end of the first edge 61a and the upper end of the second edge 61b in a round manner ) and a second curved connecting portion 62b that roundly connects the lower end of the second edge 61b and the upper end of the third edge 61c, and the wing body 61 is located on the inner circumferential surface of the guide body 51. By disposing in plurality, it will be possible to form a stable flow path that minimizes head loss and minimizes vortex generation.

In addition, according to the present invention, the length (H) of the wing body 61 protruding from the inner circumferential surface of the guide body 51 is 50% to 90% of the inner diameter (R) of the guide body 51, external suction It will be possible to prevent the occurrence of a vortex in advance through the formation of a stable and uniform flow path without interfering with the flow of the fluid sucked through the hole 51b.

As described above, the present invention is not limited to the installation conditions of the site, and it is easy to install, has a wide suction starting point, can reduce the loss head, and helps to form a stable flow path in the process of sucking fluid from the ground. It can be seen that the basic technical idea is to provide a suction guide device for a submersible pump.

And, within the scope of the basic technical spirit of the present invention, many other modifications and applications are also possible for those of ordinary skill in the art.

10...column pipe
20...sheet
21...seating ribs
22...Fixed ribs
30...pump
31...pump body
32...Internal suction flow path
32a...suction port
32b...Discharge port
33...Fixed Ears
40...the ground
50...suction guide
51...Guide body
51a...connection hole
51b...external suction hole
60...vortex prevention part
61...Guide wing (wing body)
61a...first edge
61b...second edge
61c...3rd edge
61d...4th edge
62a...first curved connection
62b...Second curved connection
D1...first diameter
D2...2nd diameter
D3...3rd diameter
D4...4th diameter
H... the length of the wing body 61 protruding from the inner circumferential surface of the guide body 51
R...Inner diameter of the guide body (51)

Claims (5)

a column pipe perpendicular to the ground and arranged at a lower end spaced apart from the ground;
a ring-shaped sheet provided on an inner circumferential surface of a lower side of the column pipe;
a pump seated and fixed to the seat; and
It is mounted on the lower end of the column pipe so as to be connected to the suction side provided at the lower end of the pump, and includes a suction guide that forms an internal flow path whose diameter is gradually reduced toward the upper side,
The suction guide shortens the suction point at which the fluid is sucked from the ground to the suction side of the pump, thereby preventing a vortex from occurring around the lower end of the column pipe as the fluid is sucked from the lower end of the column pipe. At the same time, preventing the occurrence of a vortex of the fluid sucked from the inside of the suction guide to the suction side of the pump,
The suction point is a suction guide device for a submersible pump, characterized in that the length of an imaginary line extending from the ground to the center of the suction side of the lower end of the pump vertically.
The method according to claim 1,
The suction guide is
Connected to a suction port having a first diameter formed at the lower end of the pump and fixed to the lower side of the seat, a connection hole having the first diameter and exposed outside the lower end of the column pipe, larger than the first diameter A guide body formed in the shape of a bell mouth for connecting external suction holes having a third diameter to each other;
and a vortex prevention part formed on the inner circumferential surface of the guide body to regulate vortex generation of the fluid flowing into the guide body,
The suction guide device for a submersible pump, characterized in that the connection hole and the external suction hole are parallel to the ground.
3. The method according to claim 2,
The vortex prevention unit,
A plurality of guide wings are formed on the inner circumferential surface of the guide body and are spaced apart from each other.
The guide wing is a suction guide device for a submersible pump, characterized in that arranged at equal intervals radially on the inner circumferential surface of the guide body.
3. The method according to claim 2,
The vortex prevention unit,
It protrudes from the inner circumferential surface of the guide body toward the center of the guide body, and forms an upper end edge disposed on the same plane as the connection hole, a first edge parallel to the ground, and a first edge extending downward from the first edge and a second edge inclined to form an acute angle with respect to the first edge, a third edge inclinedly extending from the second edge to the external suction hole, and the first edge from the third edge to the edge of the external suction hole And a wing body comprising a fourth edge extending parallel to,
a first curved connecting portion for roundly connecting the end of the first edge and the upper end of the second edge;
and a second curved connection part connecting the lower end of the second edge and the upper end of the third edge in a round manner,
The wing body is a suction guide device for a submersible pump, characterized in that it is arranged in plurality on the inner circumferential surface of the guide body.
5. The method according to claim 4,
The length of the wing body protruding from the inner circumferential surface of the guide body is a suction guide device for a submersible pump, characterized in that 50% to 90% of the inner diameter of the guide body.

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