KR20190015840A - Oil leakless type multi-shaft agitator for digestion tank equipped with a water level interlocking type scum removing device - Google Patents

Abstract

Disclosed is an oil leakage prevention type multi-shaft agitator for a digestion tank equipped with a water level-interconnected scum removing device, which can be applied to and used for a digestion tank capable of collecting sludge of high density having high specific gravity in a digestion tank at one time and processing the same, and in which the height of a scum blade is flexibly adjusted according to a change in the water level of a mixture filled in the digestion tank. The oil leakage prevention type multi-shaft agitator for a digestion tank equipped with a water level-interconnected scum removing device comprises: a speed reducer for separating a rotary force of a drive means into at least two so as to reduce the speed of each rotary force at a predetermined ratio; a first shaft for receiving any one of the at least two rotary forces output by having the speed reduced by the speed reducer at a predetermined ratio, so as to output the received rotary force; a second shaft for receiving the other rotary force of the at least two rotary forces output by having the speed reduced by the speed reducer at a predetermined ratio, so as to output the received rotary force; a first impeller installed on a lower end of the second shaft to be interconnected with the second shaft and rotated, and including at least one blade formed such that at least a part of a lower end is gradually inclined downward from a tip part toward a hub side; and a scum removing device rotated by receiving the rotary force from the first shaft and lifted according to the water level of the mixture filled in an agitation tank.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to an oil leakage preventing multi-shaft agitator for a fire extinguishing system equipped with a water level interlocking type scum removing device,

The present invention relates to a multi-shaft agitator for fire extinguishing a fire extinguishing system equipped with a water level interlock type scum removing device, and more particularly to a multi- The present invention relates to a multi-shaft agitator for preventing fire extinguishing of a fire extinguisher.

Generally, wastewater containing sewage sludge, manure sludge, food sludge, etc., is fed into wastewater containing freshly concentrated sludge into old wastewater that has previously been introduced into the digester. When the wastewater containing a large amount of concentrated wastewater is introduced into the old wastewater sludge, And the water is treated by reducing and dissolving the sludge in a reducing manner.

Such a digester needs to agitate the old sludge and the newly added concentrated sludge so that the old sludge and the newly introduced concentrated sludge are circulated uniformly throughout the digester and the digestion is promoted because the sediment is not generated in the digester. The processing efficiency is improved.

In the sludge agitation of the digester, a method using a digestion gas or a method using a mechanical stirrer is used. In recent years, the use of a mechanical stirrer is increasing.

In the case of the mechanical stirrer, the rotational force of the driving means is decelerated at a predetermined rate through the decelerating means and is output through the shaft. The impeller is installed in the shaft, and the impeller is rotated in conjunction with the shaft to stir the sludge in the digester.

The shaft is provided with at least one impeller capable of moving the sludge mixture in the digester to the bottom of the digester, and an impeller for moving the sludge that sinks to the bottom of the digester to the upper side of the digester is installed at the lowermost end of the shaft.

Generally, in the case of the digester, the lower surface is inclined downwardly toward the center direction, thereby preventing accumulation of sludge on the corner of the bottom of the digester. In the case of the impeller for moving the sludge sinking on the bottom of the digester to the upper side of the digester, By using an impeller that is configured to level the blade with the shaft, the blade and the bottom of the digester become non-parallel.

Therefore, in the case of a general impeller for moving the sludge sinking on the bottom of the digester to the bottom of the digester, interference between the bottom of the impeller and the bottom of the digester is generated due to the characteristics of the bottom of the digester, There is a problem in that the limitation and the installation position are limited.

Conventionally, wastewater containing sewage sludge, manure sludge, food sludge and the like has been separated and treated in different digestion tanks. Recently, however, wastewater containing sewage sludge, manure sludge, food sludge, It is difficult to move the sludge settled on the bottom of the digester to the upper part of the digester by using the conventional general impeller which is limited in size and installation position due to the high concentration of sludge, .

On the other hand, scum is inevitably generated in the biological treatment of sewage sludge, manure sludge and food sludge.

Such scum is a residue of light weight less than water and floats on the surface of the digester.

A scum removing device having a plurality of scum blades is used to remove scum floated on the water surface of the digester. Since the scum removing device is not freely adjustable in height, it can not cope with fluctuations in the water level of the digester. There is a problem.

That is, in order to remove the scum floated above the water surface of the digester with the scum blades, the scum blades should also be located near the water surface together with the scum, but when the water level of the digester is formed higher or lower than the scum blades, There is a problem that the scum floated on the water surface can not be effectively removed by using the blade.

Korean Registered Patent No. 1015470 (registered date: February 10, 2011, multi-shaft stirrer)

It is an object of the present invention to provide a digester capable of collecting high-density sludge having a high specific gravity at a time and applying the same to a digester, wherein the level of the scum blade is fluidly controlled Type scavenging device for a fire extinguishing tank, which is equipped with a type-of-scum removing device.

Other objects and advantages of the present invention will become apparent to those skilled in the art from the following detailed description.

In order to attain the above object, the present invention provides a motor vehicle including a speed reducer which separates the rotational force of the driving means into at least two and decelerates them at a predetermined ratio, and at least two rotational forces that are decelerated and output at a predetermined ratio by the speed reducer, A second shaft for receiving and outputting a rotational force of at least one of at least two rotational forces decelerated at a predetermined ratio by the decelerator and outputting the rotational force; A first impeller installed at a lower end portion of the second shaft and having at least one blade formed such that at least a part of the lower end portion is gradually inclined downward from the tip portion toward the hub side; A scum which is lifted and lowered according to the level of the mixture filled in the stirring tank Water gives digestion still leak-proof multi-screw agitator linked scum removal device is installed, including a device.

The first impeller may be coupled to the hub such that the blades are perpendicular to the upper and lower surfaces of the hub.

In addition, the first impeller may be formed such that at least a part of the lower end of the blade is inclined downwardly from the tip portion toward the hub side at an inclination angle corresponding to the inclination angle of the bottom surface of the digester.

Also, the first impeller may be formed such that the cross-sectional area of the first impeller gradually increases from the tip portion toward the hub side.

In addition, the first impeller may be formed in a spiral shape in which the blade is convex in the rotational direction.

In addition, the first impeller may be formed such that a part of the lower end of the blade adjacent to the hub is horizontal with the lower surface of the hub.

The first impeller may further include a thrust propulsion tip portion extending from the tip portion of the blade so as to have a constant vertical width.

For example, the thrust propulsion tip portion may be formed in a convex spiral shape in a direction opposite to the rotation of the blade.

In addition, the thrust force improving tip may be extended from the tip portion so as to be inclined upward from a tip portion of the blade toward an end portion thereof.

The driving force improving tip may be extended to the tip portion so as to be inclined upward from a tip portion to an end portion of the blade so that the upper and lower end portions have the same slope as the lower end portion of the blade.

The first impeller may further include an intensity reinforcing member attached between neighboring blades to reinforce the strength of the blades.

Here, the strength reinforcing member may be formed in a plate shape.

In addition, the first impeller may further include at least one hole portion formed in the strength reinforcing member.

Here, the strength reinforcing member may be disposed to be perpendicular to the blade and attached between neighboring blades.

For example, the scum removing device includes a guide unit that is rotated by receiving a rotational force of the first shaft and penetrated by the second shaft, and a second shaft that is slidably coupled to the inside of the guide unit to be moved up and down along the guide unit, A hub which is radially disposed in the hub and is rotatable in conjunction with the hub by receiving the rotational force of the guide unit and which is rotated together with the hub along the guide unit according to the level of the stirring tank; And a scum blade unit composed of a number of buoyancy scum blades.

For example, the guide unit may include a first rotary plate detachably connected to the first shaft to be rotatably received through a first shaft, the first rotary plate being penetrated by the second shaft, The buoyancy scum blades are guided by the level of the agitating tank while the rotational force of the first rotating plate is transmitted to the buoyancy scomold blade so that the hub ascended and descended is not released to the outside of the guide unit And a plurality of first guide bars arranged to be interposed between the adjacent buoyancy scam blades so as to be coupled to the first rotation plate.

The guide unit may further include a second rotating plate coupled to the plurality of first guide bars and penetrated by the second shaft.

The guide unit may include a pair of second guide bars arranged to be in a triangular shape and to be coupled to the first rotating plate so as to be in close contact with the pair of adjacent buoyancy scam blades, And a plurality of reinforcing members connecting the first and second guide bars to each other.

In another example, the guide unit may include a first rotary plate detachably connected to the first shaft to be rotatably received through the first shaft and penetrated by the second shaft, A plurality of first guide bars arranged at a predetermined interval to be in close contact with a pair of buoyancy scam blades and coupled to the first rotation plate, a plurality of first guide bars arranged at a predetermined interval between the pair of buoyancy scum blades adjacent to each other, A plurality of first transverse reinforcement members reinforcing the first transverse reinforcement members by connecting the first guide bars adjacent to each other and reinforcing the first transverse reinforcement members adjacent to each other and connecting the transverse reinforcement member and the first guide bars to each other And a plurality of second transverse stiffeners to be reinforced.

The scum blade unit may further include a scraper installed on at least one of the plurality of buoyancy scum blades and scraping the scum attached to the inner wall of the agitation tank.

For example, the scum removing device includes a guide unit that is rotated by receiving a rotational force of the speed reducer through a first shaft and is passed through a second shaft that receives rotational force from the speed reducer and rotates the impeller, A buoyancy box which is lifted along the guide unit and penetrated by the guide unit so as to be rotated by receiving the rotational force of the guide unit and penetrated by the second shaft, And a scum blade unit composed of a plurality of buoyancy scum blades radially disposed in the buoyancy box.

Here, the guide unit includes a first rotary plate detachably connected to the first shaft to be rotated by receiving the rotational force of the speed reducer through the first shaft and penetrated by the second shaft, A plurality of first guide bars guiding the buoyancy box and passing through the buoyancy box to transmit the rotation force of the first rotation plate to the buoyancy box, And a second rotating plate penetrating by the second shaft.

For example, the sliding coupling unit may include a plurality of support brackets protruding from the buoyancy box, and a plurality of rollers rotatably installed on the support bracket so as to be in close contact with the first guide bar of the guide unit.

The scum blade unit may further include a scraper installed on at least one of the plurality of buoyancy scum blades and scraping the scum attached to the inner wall of the agitation tank.

The leakage preventive multi-shaft agitator for a digester may further include at least one second impeller installed in the second shaft.

Here, the second impeller passes a portion of the fluid that strikes the blade with the blade as it rotates, at an increased flow rate while forming a vortex to the rear side of the blade, generating vortex and turbulence at the rear side of the blade, And at least one injection hole provided in the blade so as to improve the efficiency and to increase the driving force in the rotational direction of the blade.

The injection holes may be arranged such that a plurality of the injection holes are spaced apart from each other by a predetermined distance in a longitudinal direction of the blades.

In addition, the injection hole may be formed so that the cross-sectional area gradually decreases from the root portion of the blade to the tip portion.

The injection holes formed in the respective rows in the longitudinal direction of the blade may be formed so as to be alternated with the injection holes formed in the neighboring rows.

Also, the injection holes formed in the same row in the longitudinal direction of the blade may be arranged so that the center line is orthogonal to the adjacent injection holes.

The injection holes may be formed on the root portion side of the blades so that a plurality of the injection holes are spaced at least by a predetermined distance in a longitudinal direction of the blades.

For example, the injection hole may include a first hole formed in the blade in such a manner that a cross-sectional area of the injection hole is gradually increased so as to allow a part of the fluid, which collides with the blade, to pass through the blade toward the rear side of the blade at an increased flow rate, And a second hole formed in the blade so as to be disposed at a position corresponding to the first hole and rotated 180 degrees from the first hole with respect to the blade surface.

For example, the first hole portion and the second hole portion may be formed to have the same cross-sectional area.

In another example, the first hole portion and the second hole portion may be formed to have different sectional areas.

The hole portion of the first hole portion and the second hole portion having a large cross-sectional area may be disposed to face the root portion side of the blade, and the hole portion having a small cross-sectional area may be disposed to face the tip portion of the blade.

In addition, the injection hole may further include a connection portion formed on the blade so as to allow the first hole portion and the second hole portion to communicate with each other.

Here, the connection portion may have a smaller cross-sectional area than the first and second holes.

As described above, the leak preventive multi-shaft stirrer for a fire extinguishing system according to the present invention is provided with a water level interlocking type scum removing device according to the present invention, which allows the first impeller to be installed without being limited in size and installation position, The sludge mixture that has been submerged can be moved upward along the bottom surface of the inclined digester with a larger thrust force so that the sludge can be agitated evenly throughout the digester. Thus, even if only one impeller is installed, the high concentration sludge can be agitated throughout the digester It is possible to greatly improve the water treatment efficiency of the digestion tank by improving the agitation efficiency as well as reducing the manufacturing cost and operation cost of the agitator.

In addition, the leak preventive multi-shaft stirrer for a fire extinguisher equipped with a water level interlock type scum removing device according to the present invention includes a first impeller capable of agitating sludge with a higher thrust, Since the high-concentration sludge can be applied to the digester that can treat at one time, it can greatly reduce facility costs such as wastewater or sewage treatment plant.

In the lean-preventing multi-shaft agitator for fire extinguishers according to the present invention, the mixture in the digestion tank is stirred by the first and second impellers rotated by the second shaft connected to the speed reducer, The scum blade unit is lifted and lowered along the guide unit along with the water level of the mixture by the buoyancy regardless of the water level of the mixture to remove the scum floating on the water surface of the mixture in a state where the buoyancy scum blade is always located on the water surface The efficiency of water treatment can be further improved by providing a constant scum removal efficiency.

In addition, the buoyancy scum blades are rotated to remove scum floating on the water surface of the mixture, and scum attached to the inner wall of the digester can be removed, thereby further improving the water treatment efficiency.

The effects of the present invention will be clearly understood and understood by those skilled in the art, either through the specific details described below, or during the course of practicing the present invention.

1 is a view for explaining a leakage preventing type multi-shaft stirrer for a fire extinguisher equipped with a water level interlocking type scum removing device according to a first embodiment of the present invention
Fig. 2 is a perspective view of a first impeller applied to a leak-proof multi-shaft agitator for a fire extinguisher, in which a water level interlocking type scum removing device according to a first embodiment of the present invention is installed;
Fig. 3 is a front view of Fig. 2
Fig. 4 is a plan view of Fig. 2
FIG. 5 is a detailed view of FIG.
6 is a plan view of the scum blade
7 is a perspective view of a scum removing device applied to a leakage preventing type multi-shaft agitator for a fire extinguisher provided with a water level interlocking type scum removing device according to the first embodiment of the present invention
FIG. 8 is a cross-
Figs. 9 to 14 show various examples of the second impeller
15 is a view for explaining a dead zone generated in the rear portion of a rotating blade;
16 is a perspective view of a scum removing device applied to a leak preventive multi-shaft agitator for a fire extinguisher equipped with a water level interlocking type scum removing device according to a second embodiment of the present invention
17 is a bottom view of Fig. 16
18 is a perspective view of a scum removing device applied to a leakage preventing type multi-shaft agitator for a fire extinguisher provided with a water level interlocking type scum removing device according to a third embodiment of the present invention
Fig. 19 is a plan view of Fig. 18
20 is a perspective view for explaining a scraper.
21 is a bottom view for explaining a scum removing device applied to a leakage preventing type multi-shaft agitator for a fire extinguisher equipped with a water level interlocking type scum removing device according to a fourth embodiment of the present invention

The present invention is capable of various modifications and various forms, and specific embodiments are illustrated in the drawings and described in detail in the text. It should be understood, however, that the invention is not intended to be limited to the particular forms disclosed, but includes all modifications, equivalents, and alternatives falling within the spirit and scope of the invention.

The terms first, second, etc. may be used to describe various elements, but the elements should not be limited by the terms. The terms are used only for the purpose of distinguishing one component from another. For example, without departing from the scope of the present invention, the first component may be referred to as a second component, and similarly, the second component may also be referred to as a first component.

The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. The singular expressions include plural expressions unless the context clearly dictates otherwise. In the present application, the terms "comprising" or "having ", and the like, are intended to specify the presence of stated features, integers, steps, operations, elements, parts, or combinations thereof, But do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, parts, or combinations thereof.

Unless otherwise defined, all terms used herein, including technical or scientific terms, have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs.

Terms such as those defined in commonly used dictionaries are to be interpreted as having a meaning consistent with the meaning in the context of the relevant art and are to be interpreted as ideal or overly formal in meaning unless expressly defined in the present application Do not.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Reference will now be made in detail to preferred embodiments of the present invention, examples of which are illustrated in the accompanying drawings.

≪ Embodiment 1 >

1 is a view for explaining a leakage preventing type multi-shaft stirrer for a fire extinguisher equipped with a water level interlocking type scum removing device according to a first embodiment of the present invention, and FIG. 2 is a schematic view showing a water level interlocking type scum according to the first embodiment of the present invention. 3 is a front view of FIG. 2, FIG. 4 is a plan view of FIG. 2, FIG. 5 is a detail view of FIG. 1, and FIG. 7 is a perspective view of a scum removing device applied to a leak preventive multi-shaft agitator for a fire extinguishing tank equipped with a water level interlocking type scum removing device according to the first embodiment of the present invention, FIG. 8 is a perspective view of the scum removing device, Fig.

1 to 8, a fire extinguishing type multi-axis agitator 100 for a fire extinguishing system equipped with a water level interlock type scum removing device according to the first embodiment of the present invention includes a driving unit 110, a speed reducer 120, A shaft 130, a second shaft 140, a first impeller 150, and a scum removing device 160.

The driving unit 110 may be connected to the speed reducer 120 to divide the rotational force into at least two through the speed reducer 120, and may be decelerated at a predetermined rate and then output. Here, the driving means 110 may be a motor.

The speed reducer 120 may divide the rotational force of the driving means 110 into at least two and output them at a predetermined rate. The speed reducer 120 decelerates the rotational force of the driving means 110 by a gear ratio of the involute gear 121 to transmit the reduced rotational speed to the second shaft 140, Is connected to the first shaft 130 through the cycloid gear 122 so that the rotational force of the second shaft 140 is decelerated at a predetermined ratio through the cycloid gear 122 to be transmitted to the first shaft 130 .

The first shaft 130 may receive and output one of at least two rotational forces that are decelerated at a predetermined rate by the speed reducer 120. That is, the first shaft may be rotated by being connected to the cyclic gear 122 that decelerates the rotational force of the second shaft 140 at a predetermined ratio.

The second shaft 140 may receive and output another one of at least two rotational forces that are decelerated and output at a predetermined rate by the speed reducer 120. That is, the second shaft 140 may be connected to the involute gear 121 that decelerates the rotational force of the driving means 110 at a predetermined ratio.

The lower end of the second shaft 140 may be rotatably supported by a support member 141 installed on the bottom surface 210 of the digester 200.

Here, the first shaft 130 and the second shaft 140 may be concentrically arranged. The first shaft 130 is formed in a hollow shape and connected to the speed reducer 120 and the second shaft 140 is connected to the first shaft 130 so as to be concentric with the first shaft 130. [ (130) and connected to the speed reducer (120). The second shaft 140 may be longer than the first shaft 130 so as to protrude out of the first shaft 130.

The first impeller 150 is installed at a lower end of the second shaft 140 and rotates in conjunction with the second shaft 140 to stir the mixture in the digester 200.

For example, the first impeller 150 may include a hub 151 and a blade 152.

The hub 151 may have a hollow cylindrical shape and may be detachably coupled to the second shaft 140. For example, the hub 151 may be detachably coupled to the lower end of the second shaft 140.

At least one of the blades 152 may be coupled to the hub 151. Preferably, a plurality of the blades 152 may be radially arranged around the hub 151 and coupled to the hub 151.

Here, the blade 152 may be radially arranged around the hub 151 so as to be perpendicular to the upper and lower surfaces of the hub 151, and may be coupled to the hub 151.

For example, the blade 152 may be formed such that at least a part of the lower end portion thereof is gradually inclined downward from the tip 152a toward the hub 151 side. The upper end 152d of the blade 152 may be formed to be horizontal with the upper surface of the hub 151. [

The blade 152 is formed so that at least a part of the lower end portion 152c is gradually inclined downward from the tip 152a toward the hub 151 side and the upper end portion 152d is formed to be inclined downward from the tip 152a toward the hub 151 So that the cross-sectional area increases from the tip 152a to the hub 151 side.

The blade 152 may be formed such that at least a part of the lower end portion thereof is gradually inclined downward from the tip 152a portion toward the hub 151 side at an inclination angle corresponding to the inclination angle of the bottom surface 210 of the digester 200 have.

A portion of the lower end of the blade 152 adjacent to the hub 151 may be formed to be horizontal with the lower surface of the hub 151.

As described above, at least a part of the lower end of the blade 152 is inclined downwardly from the tip 152a toward the hub 151 at an angle corresponding to the inclination angle of the bottom surface 210 of the digester 200 The bottom surface 210 of the digester 200 and the lower end of the blade 152 are made horizontal so that the lower surface of the digester 200 is inclined downward toward the center.

Therefore, there is no interference between the blade 152 and the bottom surface 210 of the digester 200, so that the blade 152 can be installed in the agitator 100 without any size restriction, and the installation position is not limited.

In addition, since the lower end portion 152c of the blade 152 is horizontal with the bottom surface 210 of the digester 200, the blade 152 is rotated by the blade 152 during rotation of the first impeller 150, So that the sludge that is sitting on the bottom surface 210 of the digester 200 is pushed upward and moved upwards along the bottom surface 210 of the digester 200 upward from the central portion toward the corner portion so as to be evenly stirred throughout the digester 200 .

That is, when a conventional general impeller in which the bottom surface 210 of the digester 200 and the lower end 152c of the blade 152 are not horizontal is operated, the digester 200 is rotated in the direction perpendicular to the side surface of the digester 200 200) sludge that is not on the bottom surface 210 is pushed out. Therefore, the sludge which is pushed by the blade and moves to the sidewall side of the digestive tank 200 is hit by the bottom surface 210 of the digestive tank 200 formed upward from the central portion toward the sidewall, so that sludge sitting on the bottom of the digestive tank 200 There is a problem in that it is only locally stirred and can not be evenly stirred throughout the digester 200.

Since the lower end 152c of the blade 152 is parallel to the bottom surface 210 of the digester 200, the first impeller 150 is rotated about the rotation axis of the blade 152 when the first impeller 150 rotates. The sludge moved toward the sidewall of the digester 200 is moved toward the sidewall of the digester 200 while being lifted along the bottom 210 of the digester 200 without colliding with the bottom 210 of the digester 200, So that the water treatment efficiency of the digester 200 can be greatly improved.

In addition, the first impeller 150 is formed such that the cross-sectional area of the first impeller 150 gradually increases from the tip 152a toward the hub 151, thereby further improving the stirring efficiency of the sludge.

That is, when the first impeller 150 rotates, the flow rate at the portion of the root 152b of the blade 152 adjacent to the hub 151 is the slowest, and the flow rate at the tip 152a of the blade 152 is the fastest appear. Therefore, the stirring efficiency of the sludge is lowest at the root 152b of the blade 152 and the stirring efficiency at the tip 152a of the blade 152 is the highest.

Therefore, when the sludge in the digester 200 is agitated using a general impeller which does not consider the cross-sectional area of the blade 152 at all, the sludge submerged in the lower portion of the impeller hub is not properly agitated.

On the other hand, in consideration of the fact that the first impeller 150 has the lowest flow rate at the root 152b of the blade 152 and the highest flow rate at the tip 152a of the blade 152, 152 is gradually increased from the portion of the tip 152a to the portion of the root 152b on the hub 151 side so that the flow rate gradually increases from the tip 152a portion of the blade 152 toward the hub 151 side The sludge settling on the lower side of the hub 151 of the first impeller 150 can be smoothly pushed up to the sidewall of the digester 200 along the bottom surface 210 of the digester 200 and stirred So that the stirring efficiency can be further improved.

Meanwhile, the blade 152 may be formed in a convex spiral shape in the rotating direction. More specifically, as shown in FIG. 5, the blade 152 may be formed in a convex spiral shape in the rotational direction A side in a plan view.

Therefore, when the first impeller 150 rotates, the sludge mixture slides in the direction of the tip 152a from the portion of the root 152b along the spiral blade 152 to be pushed outward of the blade 152 So that the stirring efficiency can be further improved.

That is, in the case of a general impeller formed in a straight line when the blade is viewed in a plane, the sludge mixture is vertically pushed by the blade during rotation of the impeller, so that the sludge mixture in the root portion of the blade It can not be discharged and a local turbulence phenomenon may occur and the stirring efficiency may be lowered.

On the other hand, in the case of the first impeller 150, the blade 152 is formed in a spiral shape convex in the rotating direction, so that when the first impeller 150 rotates, the sludge mixture is pushed at an obtuse angle by the blade 152, Even in the case of the sludge mixture in the portion of the root 152b of the blade 152, it is possible to slide the blade 152 along the blade 152 in the direction of the tip 152a without causing a local turbulence phenomenon, .

The first impeller 150 may further include a thrust force improving tip 153.

The driving force improving tip 153 may extend from the tip 152a of the blade 152 to have a constant vertical width.

In addition, the driving force improving tip 153 may be formed in a convex spiral shape in a direction opposite to the rotation of the blade 152.

In addition, the driving force improving tip 153 may extend from the tip 152a so as to be inclined upward from the tip 152a of the blade 152 toward the tip.

For example, the driving force improving tip 153 may be formed so that the tip of the tip 152a of the blade 152 descends toward the end so that the upper and lower ends thereof may have the same slope as the lower end 152c of the blade 152 It is preferable to extend from the tip 152a so as to be inclined upward.

The driving force improving tip 153 is extended from the tip 152a of the blade 152 so as to have a constant vertical width and is formed in a convex spiral shape opposite to the rotation direction of the blade 152, The sludge mixture discharged from the portion of the root 152b of the blade 152 to the tip 152a portion of the blade 152 along the blade 152 can be pushed out of the blade 152 to be pushed by the blade 152 It is possible to further improve the stirring efficiency of the sludge mixture.

The tip 152a of the blade 152 is moved upward from the tip 152a of the blade 152 toward the end of the blade 152 so that the upper and lower ends of the tip 153a may have the same slope as the lower end 152c of the blade 152. [ The sludge mixture discharged from the portion of the root 152b of the blade 152 to the tip 152a of the blade 152 along the blade 152 has a larger thrust force So that the stirring efficiency can be further improved by being raised to the upper side of the digester 200.

The first impeller 150 may further include an intensity reinforcing member 154.

The strength reinforcing member 154 is attached between the neighboring blades 152 to reinforce the strength of the blades 152.

For example, the strength reinforcing member 154 may be formed in a plate shape.

At least one hole 155 through which the sludge mixture can pass may be formed in the strength reinforcing member 154 to prevent the sludge mixture located under the strength reinforcing member 154 from being clogged by the strength reinforcing member 154. [ Can be formed.

The strength reinforcing member 154 may be disposed between the neighboring blades 152 so as to be perpendicular to the blades 152.

Meanwhile, the impeller 150 for the agitator according to the present invention is preferably made of stainless steel or FRP.

The scum removing device 160 is connected to the first shaft 140 and is rotated by receiving a rotational force decelerated from the first shaft 140 at a predetermined ratio and at the same time is rotated at a water level of the mixture filled in the digester 200 And can always be located near the water surface of the packed mixture in the digester 200.

The scum removing device 160 may be made of a material having a specific gravity smaller than that of water so as to be floated by the mixture filled in the digester 200.

For example, the scum removing device 160 may be made of a material such as PP, PVC, FRP, or the like.

The scum removing device 160 may be made of stainless steel if necessary. When the scum removing device 160 is made of stainless steel, buckling force is applied to the scum removing device 160 A buoyancy providing means capable of providing a buoyancy can be further included in the scum removing device 160.

Here, the scum removing device 160 may include a guide unit 161 and a scum blade unit 162.

The guide unit 161 may be rotated by receiving the rotational force of the first shaft 130 and may be penetrated by the second shaft 140.

The scum blade unit 162 is rotated by the guide unit 161 and floated by the mixture filled in the digestion tank 200. The scum blade unit 162 is rotated by the guide unit 161 according to the level of the mixture filled in the digestion tank 200 And can be lifted and lowered.

For example, the scum blade unit 162 may include a hub 1620 and a buoyancy scum blade 1621 (1622).

The hub 1620 is formed in a circular ring shape and is slidably coupled to the guide unit 161 so as to be moved up and down along the guide unit 161. The hub 1620 may have a through hole 1620a and the through hole 1620a may be penetrated by the second shaft 140. [

A plurality of the buoyancy scam blades 1621 and 1622 may be radially arranged on the hub 1620. The buoyancy scum blades 1621 and 1622 may be rotated together with the hub 1620 to receive the rotational force of the guide unit 161 and rotate together with the guide unit 161 according to the level of the digestion tank 200. [ And can be lifted and lowered together with the hub 1620 along with the hub 1620.

For example, the buoyancy scum blades 1621 and 1622 may be disposed radially so as to be spaced apart from the hub 1620 by a predetermined distance. Here, the two first buoyancy scum blades 1621 facing each other are formed to extend to the vicinity of the inner wall of the digester 200, and the other two second buoyancy scum blades 1622 opposed to each other extend from the first buoyancy scum blade 1621).

The buoyancy scum blades 1621 and 1622 adjacent to each other are connected to each other by at least one reinforcing wire 1624 and are reinforced by the tension of the reinforcing wire 1624, So as to further reinforce the strength. Here, the tension of the reinforcing wire 1624 can be adjusted.

Meanwhile, the guide unit 161 may include a first rotating plate 1610, a first guide bar 1611, and a second rotating plate 1612.

The first rotating plate 1610 may be detachably connected to the first shaft 130 to rotate by receiving the rotational force of the speed reducer 120 through the first shaft 130. A through hole 1610a may be formed in the first rotating plate 1610 and may be penetrated by the second shaft 140. [

A plurality of the first guide bars 1611 may be coupled to the first rotation plate 1610 at a predetermined interval. The first guide bar 1611 is installed to surround the hub 1620 so that the hub 1620 lifted and lowered according to the water level of the digester 200 is not released to the outside of the guide unit 161, It is preferable that a plurality of light sources are coupled to the light source 1610. The first guide bar 1611 transmits the rotational force of the first rotating plate 1610 to the buoyancy scream blades 1621 and 1622 and the buoyancy scum 1620, And may be disposed to be interposed between the adjacent floating scream blades 1621 and 1622 so as to guide the blades 1621 and 1622. [

The second rotation plate 1612 may be coupled to the plurality of first guide bars 1611. Similarly to the first rotating plate 1610, the second rotating plate 1612 may be formed with a through hole 1612a and may be penetrated by the second shaft 140. [

Meanwhile, the scum blade unit 162 may further include a scraper 1625 (see FIG. 13). The scraper 1625 may be disposed on at least one of the plurality of buoyancy scam blades 1621 and 1622 to scrape the scum attached to the inner wall of the digester 200. Here, the scraper 1625 may be attached to a sub-buoyancy box 1626 (see FIG. 13) installed in the buoyancy screaming blade 1621. For example, the scraper 1625 may be formed of rubber.

For example, the scraper 1625 may be installed in a first floating scream blade 1621 that extends to the vicinity of the inner wall of the stirring tank 200 and faces each other.

The leakage preventive multi-shaft agitator 100 for a digester may further include at least one second impeller 170 installed in the second shaft 140, .

Here, the second impeller 170 can move the mixture on the upper part of the digestion tank 140 to the lower end of the digestion tank 140 and stir the mixture, thereby further improving the stirring efficiency.

The second impeller 170 will be described in detail with reference to FIGS. 9 to 15. FIG.

FIGS. 9 to 14 are views showing various examples of the second impeller, and FIG. 15 is a view for explaining a dead zone generated in the rear portion of a rotating blade.

Referring to FIGS. 9 and 16, the second impeller 170 may include a hub 171, a hub plate 172, a blade 173, and an injection hole 174.

The hub 171 may be installed on the second shaft 140 so as to be rotated in conjunction with the second shaft 140. For example, the hub 171 may be detachably installed on the second shaft 140.

A plurality of the hub plates 172 may be disposed at equal intervals and attached to the outer circumferential surface of the hub 171. For example, three hub plates 172 may be disposed at intervals of 120 degrees and attached to the outer circumferential surface of the hub 171.

The blade 173 may be detachably coupled to the hub plate 172. For example, the blade 173 may be releasably coupled to the hub plate 172 by a plurality of fastening members (not shown). Here, the blade 173 may be a hydro paddle type blade as shown in FIG.

At least one injection hole 174 may be formed in the blade 173. The injection hole 174 may allow a part of the fluid that collides with the blade 173 to pass through the blade 173 at an increased flow rate while forming a vortex toward the rear side of the blade 173 as the blade 173 rotates.

The injection hole 174 allows a part of the fluid that collides with the blade 173 to pass through the blade 173 at an increased flow rate toward the rear side of the blade 173 to increase the driving force in the rotating direction of the blade 173 have.

In addition, the injection hole 174 forms a vortex to the rear side of the blade 173 and discharges the fluid, thereby generating vortex and turbulence at the rear side of the blade 173, thereby greatly improving the stirring efficiency .

More specifically, as shown in FIG. 16, when a general blade 173 rotates, as the fluid moves over the blade 173 toward the rear side of the blade 173, the blade 173 A dead zone in which the fluid is not agitated is generated on the rear side of the blade 173 adjacent to the rear surface of the blade 173, thereby lowering the stirring efficiency.

In contrast, in the case of the second impeller 170 according to the present embodiment, as the blade 173 is rotated through the injection hole 174 formed in the blade 173, a part of the fluid that collides with the blade 173 And a turbulent flow is generated at the rear side of the blade 173 so that a dead zone is formed at the rear side of the blade 173 by passing the blade 173 at an increased flow rate while forming a vortex to the rear side of the blade 173, It is possible to significantly improve the stirring efficiency.

Here, the injection holes 174 may be formed in the blades 173 such that a plurality of the injection holes 174 are spaced a predetermined distance in the longitudinal direction of the blades 173.

In other words, the injection holes 174 may be formed in the blades 173 such that a plurality of the injection holes 174 are spaced apart from the root portions 173a of the blades 173 in the direction of the tips 173b.

Meanwhile, the plurality of injection holes 174 may be formed in the blade 173 with different cross-sectional areas.

The plurality of injection holes 174 are formed in the blade 173 at predetermined intervals such that the cross sectional area gradually decreases from the root portion 173a of the blade 173 to the tip portion 173b of the blade 173, And is formed to be spaced apart.

The reason why the plurality of injection holes 174 are formed so that the sectional area gradually decreases from the root portion 173a of the blade 173 to the tip portion 173b will be described.

The fluid has the smallest velocity energy at the root portion 173a of the rotating blade 173 and the fluid has the greatest velocity energy at the tip portion 173b of the blade 173, Is proportional to the cross-sectional area through which the fluid passes and the velocity of the fluid.

Therefore, the characteristics of the blade 173, in which the flow velocity gradually increases from the root portion 173a of the blade 173 having the slowest fluid velocity to the tip portion 173b of the blade 173, Sectional area of the blade 173 from the root portion 173a of the blade 173 toward the tip portion 173b of the blade 173 in order to equalize the flow rate of the fluid passing through the injection hole 174 The injection hole 174 must be formed so as to gradually decrease.

For example, the injection hole 174 may include a first hole 174a and a second hole 174b.

The first hole 174a has a cross-sectional area in a direction from one end to the other end so as to allow a part of the fluid hitting the blade 173 to pass through the blade 173 at an increased flow rate while forming a vortex to the rear side of the blade 173 May be formed on the blade 173 in a gradually increasing manner. For example, the first hole 174a may be formed in the shape of a vane blade.

The second hole 174b has a shape corresponding to the first hole 174a and is disposed at a position rotated 180 degrees from the first hole 174a with respect to the blade 173, And may be formed on the blade 173.

Here, the first hole 174a and the second hole 174b may have the same cross-sectional area.

The injection hole 174 may further include a connection portion 174c formed in the blade 173 to allow the first hole 174a and the second hole 174b to communicate with each other.

Here, the connection portion 174c may have a smaller cross-sectional area than the first and second hole portions 174a and 174b.

Therefore, vortex and turbulence can be generated in the rear portion of the blade 173 by the fluid passing through the connecting portion 174c and discharged to the rear portion of the blade 173, thereby further improving the stirring efficiency.

Another example of the second impeller will be described with reference to FIG.

The second impeller 170 shown in FIG. 10 is substantially the same as the second impeller shown in FIG. 9 except for the injection hole 174, so that other portions except for the injection hole 174 are detailed Description thereof will be omitted.

Referring to FIG. 10, a plurality of injection holes 174 of the second impeller 170 may be spaced apart from each other by a predetermined distance in the longitudinal direction of the blade 173.

Here, the plurality of injection holes 174 may be formed to have the same cross-sectional area.

For example, the injection hole 174 may include a first hole 174a and a second hole 174b.

The first hole 174a is formed in such a manner that a cross-sectional area of the blade 173 is increased to allow a part of the fluid hitting the blade 173 to pass through the blade 173 toward the rear side of the blade 173 at an increased flow rate. As shown in FIG. For example, the first hole 174a may be formed in the blade 173 in the form of a golden leaf.

The second hole 174b is formed to have the same shape and the same sectional area as the first hole 174a and is disposed at a position rotated 180 degrees from the first hole 174a with respect to the blade 173 And may be formed on the blade 173.

Here, the first hole 174a and the second hole 174b may be formed in the blade 173 at a predetermined distance from each other.

Another example of the second impeller will be described with reference to FIG.

The second impeller 170 shown in FIG. 11 is substantially the same as the second impeller shown in FIG. 9 except for the injection hole 174, so that other portions except for the injection hole 174 are detailed Description thereof will be omitted.

Referring to FIG. 11, a plurality of injection holes 174 of the second impeller 170 may be arranged to be spaced apart from each other by a predetermined distance in a longitudinal direction of the blade 173.

The injection hole 174 may be formed so that the cross-sectional area of the injection hole 174 gradually decreases from the root portion 173a of the blade 173 toward the tip portion 173b of the blade 173.

For example, the injection hole 174 may include a first hole 174a and a second hole 174b.

The first hole 174a is formed in such a manner that a cross-sectional area of the blade 173 gradually increases in order to pass a part of the fluid hitting the blade 173 toward the rear side of the blade 173 at an increased flow rate, 173). For example, the first hole 174a may be formed in a bank leaf shape.

The second hole 174b is formed in a bank leaf shape corresponding to the first hole 174a and is arranged to be rotated 180 degrees from the first hole 174a with respect to the blade 173 surface. And may be formed on the blade 173.

Here, the first hole 174a and the second hole 174b may be formed on the blade so that their cross-sectional areas are different from each other.

The first hole 174a may be formed to have a smaller cross sectional area than the first hole 174a and the root portion 173a of the blade 173 And the second hole 174b may be disposed on the tip 173b side of the blade 173. [

The reason why the second hole 174b has a smaller cross sectional area than the first hole 174a is that the first hole 174a is larger than the root hole 173a of the blade 173 The flow rate of the fluid passing through the first hole 174a is lower than the flow rate of the fluid passing through the second hole 174b so as to pass through the first and second holes 174a and 174b The cross-sectional area of the second hole 174b should be smaller than that of the first hole 174a.

In the case of the fluid passing through the first hole 174a and the second hole 174b, the flow rates are the same but the flow rates are different from each other. Therefore, the rear portion of the blade 173, that is, A vortex is generated by the fluid passing through the first and second hole portions 174a and 174b, and turbulence is generated at the portion, thereby preventing the occurrence of a dead zone and improving the stirring efficiency.

The injection hole 174 may further include a connection portion 174c formed in the blade 173 to allow the first hole 174a and the second hole 174b to communicate with each other.

Here, the connection portion 174c may have a smaller cross-sectional area than the second hole portion 174b.

12 shows another example of the second impeller.

The second impeller 170 shown in FIG. 12 is substantially the same as the second impeller shown in FIG. 9 except for the injection hole 174, so that the other parts except the injection hole 174 are detailed Description thereof will be omitted.

Referring to FIG. 12, a plurality of injection holes 174 of the second impeller 170 may be spaced a predetermined distance apart in a longitudinal direction of the blade 173.

The injection holes 174 may be disposed such that the injection holes 174 adjacent to each other in the longitudinal direction of the blade 173 are perpendicular to the center line CL.

For example, in the case of the injection hole 174 adjacent to the injection hole 174 in which the first hole portion 174a and the second hole portion 174b of the injection hole 174, which will be described later, are disposed in the lateral direction, The first hole portion 174a and the second hole portion 174b may be arranged in the vertical direction. In the case of the injection hole 174 located on both sides of the injection hole 174 in which the first and second hole portions 174a and 174b are arranged in the left and right direction, the first hole portion 174a and the second hole portion 174b 174b may be formed alternately with each other. That is, in the case of the injection hole 174 located at one side of the injection hole 174 in which the first and second hole portions 174a and 174b are arranged in the left and right direction, the first hole portion 174a is located at the upper portion, The first and second hole portions 174a and 174b may be disposed in the lower portion of the injection hole 174 disposed at the other side of the injection hole 174 disposed in the left- The second hole portion 174b may be positioned at the upper portion and the first hole portion 174a may be positioned at the lower portion.

Meanwhile, the injection hole 174 may include a first hole 174a and a second hole 174b.

The first hole 174a is formed in such a manner that a cross-sectional area of the blade 173 gradually increases in order to pass a part of the fluid hitting the blade 173 toward the rear side of the blade 173 at an increased flow rate, (Not shown). For example, the first hole 174a may be formed in a bank leaf shape.

The second hole 174b is formed in a bank leaf shape corresponding to the first hole 174a and is arranged to be rotated 180 degrees from the first hole 174a with respect to the blade 173 surface. And may be formed on the blade 173.

Here, the first hole 174a and the second hole 174b may be formed on the blade so that their cross-sectional areas are different from each other.

The injection hole 174 may further include a connecting portion 174c for connecting the first and second hole portions 174a and 174b to each other.

Here, the connecting portion 174c may be formed on the blade 173 so that the cross-sectional area of the first and second hole portions 174a and 174b is smaller than that of the hole portion.

Another example of the second impeller will be described with reference to Fig.

The second impeller 170 shown in FIG. 13 is substantially the same as the second impeller shown in FIG. 9 except for the blade 173 and the injection hole 174, so that the blade 173 and the injection hole 174, the detailed description thereof will be omitted.

Referring to FIG. 13, the blade 173 of the second impeller 170 may be a curved blade formed by bending several times in the vertical width direction.

Meanwhile, the injection holes 174 may be arranged such that a plurality of the injection holes 174 are separated from each other in the longitudinal direction of the blade 173 by a predetermined distance.

Here, the injection holes 174 formed in the respective rows in the longitudinal direction of the blade 173 may be formed so as to be alternated with the injection holes 174 formed in the neighboring columns.

For example, the injection hole 174 may include a first hole 174a and a second hole 174b.

The first hole 174a is formed in the blade 173 in such a manner that a cross-sectional area of the blade 173 gradually increases in order to allow a part of the fluid hitting the blade 173 to pass through at an increased flow rate while forming a vortex toward the rear side of the blade. . For example, the first hole 174a may be formed in a bank leaf shape.

The second hole 174b is formed in a bank leaf shape corresponding to the first hole 174a and is arranged to be rotated 180 degrees from the first hole 174a with respect to the blade 173 surface. And may be formed on the blade 173.

Here, the first hole 174a and the second hole 174b may be formed on the blade so that their cross-sectional areas are different from each other.

The first hole 174a may be formed to have a smaller cross sectional area than the first hole 174a and the root portion 173a of the blade 173 And the second hole 174b may be disposed on the tip 173b side of the blade 173. [

The reason why the second hole 174b has a smaller cross sectional area than the first hole 174a is that the first hole 174a is larger than the root hole 173a of the blade 173 The flow rate of the fluid passing through the first hole 174a is lower than the flow rate of the fluid passing through the second hole 174b so as to pass through the first and second holes 174a and 174b The cross-sectional area of the second hole 174b should be smaller than that of the first hole 174a.

In the case of the fluid passing through the first hole 174a and the second hole 174b, the flow rates are the same but the flow rates are different from each other. Therefore, the rear portion of the blade 173, that is, A vortex is generated by the fluid passing through the first and second hole portions 174a and 174b, and turbulence is generated at the portion, thereby preventing the occurrence of a dead zone and improving the stirring efficiency.

Another example of the second impeller will be described with reference to Fig.

The second impeller 170 shown in FIG. 14 is substantially the same as the second impeller shown in FIG. 9 except for the blade 173 and the injection hole 174, so that the blade 173 and the injection hole 174, the detailed description thereof will be omitted.

Referring to FIG. 14, the blade 173 of the second impeller 170 may be a hydrofoil-type blade in which a central portion of the blade 173 is bent in an oblique line.

The injection holes 174 may be formed on the side of the root portion 173a of the blade 173 such that a plurality of the injection holes 174 are spaced apart from each other by a predetermined distance in a longitudinal direction of the blade 173.

That is, the injection hole 174 is formed in the vicinity of the root portion 173a of the blade 173, and the diameter of the dead zone in which the fluid is not mixed is large, It is preferable that a plurality of protrusions are formed on the side of the root portion 173a so as to be separated from each other by a predetermined distance.

For example, the injection hole 174 may include a first hole 174a and a second hole 174b.

The first hole 174a is formed in such a manner that a cross-sectional area of the blade 173 gradually increases in order to pass a part of the fluid hitting the blade 173 toward the rear side of the blade 173 at an increased flow rate, 173). For example, the first hole 174a may be formed in a bank leaf shape.

The second hole 174b is formed in a bank leaf shape corresponding to the first hole 174a and is arranged to be rotated 180 degrees from the first hole 174a with respect to the blade 173 surface. And may be formed on the blade 173.

Here, the first hole 174a and the second hole 174b may be formed in the blade 173 so that their cross-sectional areas are different from each other.

The first hole 174a may be formed to have a smaller cross sectional area than the first hole 174a and the root portion 173a of the blade 173 And the second hole 174b may be disposed on the tip 173b side of the blade 173. [

The reason why the second hole 174b has a smaller cross sectional area than the first hole 174a is that the first hole 174a is larger than the root hole 173a of the blade 173 The flow rate of the fluid passing through the first hole 174a is lower than the flow rate of the fluid passing through the second hole 174b so as to pass through the first and second holes 174a and 174b The cross-sectional area of the second hole 174b should be smaller than that of the first hole 174a.

In the case of the fluid passing through the first hole 174a and the second hole 174b, the flow rates are the same but the flow rates are different from each other. Therefore, the rear portion of the blade 173, that is, A vortex is generated by the fluid passing through the first and second hole portions 174a and 174b, and turbulence is generated at the portion, thereby preventing the occurrence of a dead zone and improving the stirring efficiency.

≪ Embodiment 2 >

FIG. 16 is a perspective view of a scum removing device applied to a leak preventive multi-shaft agitator for a fire extinguisher provided with a water level interlocking type scum removing device according to a second embodiment of the present invention, and FIG. 17 is a bottom view of FIG.

The leak-proof multi-shaft agitator for fire extinguishing a fire extinguishing system according to the present embodiment is provided with a water level-locking type scum removing device for a fire extinguishing system for a fire extinguishing system equipped with a water level interlocking type scum removing device according to the first embodiment, Type multi-shaft agitator, descriptions of the remaining components of the scum removing device will be omitted.

16 and 17, the scum removing device 160 applied to the leak preventive multi-shaft stirrer for digestive apparatus according to the present embodiment includes a guide unit 161 and a scum blade unit 162 ).

The guide unit 161 may be rotated by receiving the rotational force of the first shaft 130 (see FIG. 5) and may be penetrated by the second shaft 140 (see FIG. 5).

The scum blade unit 162 includes a hub 1620 slidably inserted into the guide unit 161 to be moved up and down along the guide unit 161 and penetrated by the second shaft 140, And can be rotated together with the hub 1620 to receive the rotational force of the guide unit 161 and rotate along the guide unit 161 according to the water level of the digester 200 And a plurality of buoyancy scum blades 1621 and 1622 lifted and lowered together with the hub 1620.

For example, the guide unit 161 may include a first rotating plate 1610, a first guide bar 1611, a second guide bar 1613, and a stiffener 1614.

The first rotary plate 1610 may be detachably connected to the first shaft 130 to be rotatably received through the first shaft 130 by the rotational force of the speed reducer 120 (see FIG. 5). The first rotation plate 1610 may have a through-hole 1610a, and the through-hole 1610a may be penetrated by the second shaft 140.

The first guide bar 1611 surrounds the hub 1620 so that the hub 1620 lifted and lowered according to the water level of the digester 200 is not released to the outside of the guide unit 1651, 1620 to the buoyancy scombal blades 1621 and 1622 so as to guide the buoyancy scream blades 1621 and 1622 which are raised and lowered in accordance with the level of the digester 200, A plurality of scum blades 1621 and 1622 may be interposed between the first rotating plate 1610 and the first rotating plate 1610.

The second guide bars 1613 are arranged in a triangular shape with the first guide bars 1611 so as to be in close contact with a pair of adjacent floating scream blades 1621 and 1622, 1610 < / RTI >

The reinforcing member 1614 connects the first and second guide bars 1611 and 1613 adjacent to each other to reinforce the first and second guide bars 1611 and 1613, So that it can be omitted.

The scum blade unit 162 is installed in at least one of the plurality of buoyancy scam blades 1621 and is disposed in the buoyancy scam blade 1621 and is provided with a scraper 1625 for scraping the scum attached to the inner wall of the digester 200 : See Fig. 20).

Here, the scraper 1625 may be installed in a pair of first buoyancy scum blades 1621 that extend to the vicinity of the inner wall of the stirring tank 200.

For example, an auxiliary buoyancy box 1626 may be installed at the end of the first buoyancy scam blade 1621, and a scraper 1625 may be installed at the auxiliary buoyancy box 1626. Here, the scraper 1625 may be formed of rubber.

≪ Third Embodiment >

FIG. 18 is a perspective view of a scum removing device applied to a leak-proof multi-shaft agitator for a fire extinguishing system equipped with a water level interlock type scum removing device according to a third embodiment of the present invention, FIG. 19 is a plan sectional view of FIG. 18, Fig.

The leak-proof multi-shaft agitator for fire extinguishing a fire extinguishing system according to the present embodiment is provided with a water level-locking type scum removing device for a fire extinguishing system for a fire extinguishing system equipped with a water level interlocking type scum removing device according to the first embodiment, Type multi-shaft agitator, descriptions of the remaining components of the scum removing device will be omitted.

18 to 20, the scum removing device 160 applied to the leak preventive multi-shaft agitator for digestive tank provided with the water level interlock type scum removing device according to the present embodiment includes a guide unit 161 and a scum blade unit 162 ).

The guide unit 161 is rotated by receiving the rotational force of the speed reducer 120 (see FIG. 5) through the first shaft 130 (see FIG. 5), receives the rotational force from the speed reducer 120, (See FIG. 5) that rotates the first and second shafts 150 and 170 (see FIG. 1).

The scum blade unit 162 is moved up and down along the guide unit 161 according to the level of the digester 200 (see FIG. 1) A buoyancy box 1627 penetrating by the second shaft 140 and penetrated by the second shaft 140 and a sliding engagement portion 1628 formed in the buoyancy box 1627 to be slidably engaged with the guide unit 161, And a plurality of buoyancy scoop blades 1621 1622 radially disposed in the buoyancy box.

Here, the guide unit 161 may include a first rotating plate 1610, a first guide bar 1611, and a second rotating plate 1612.

The first rotating plate 1610 may be detachably connected to the first shaft 130 to rotate by receiving the rotational force of the speed reducer 120 through the first shaft 130. The first rotating plate 1610 may have a through hole 1610a and the through hole 1610a may be penetrated by the second shaft 140. [

The first guide bar 1611 guides the buoyancy box 1627 which is lifted and lowered according to the level of the digester 200 and a plurality of the first guide bars 1611 are coupled to the first rotation plate 1610 through the buoyancy box 1627 So that the rotational force of the first rotating plate 1610 can be transmitted to the buoyancy box 1627.

More specifically, the first guide bar 1611 has a plurality of through holes 1627a formed in the buoyancy box 1627 so that a plurality of through holes 1627a pass through the first guide plate 1611, And a buoyancy box 1627 which is coupled to the buoyancy box 1627 and moves up and down according to the water level of the digester 200 is connected to the first guide bar 1611 To guide the buoyancy box 1627 so that the buoyancy box 1627 can be lifted and lowered along the buoyancy box 1627.

The second rotation plate 1612 may be coupled to the first guide bar 1611. Like the first rotary plate 1611, the second rotary plate 1612 may have a through-hole 1612a, and the through-hole 1612a may be penetrated by the second shaft 140.

The sliding engagement portion 1628 may include a first support bracket 1628a, a second support bracket 1628b, and a roller 1628c.

A plurality of the first support brackets 1628a may protrude from the buoyancy box 1627 so as to be positioned beside the first guide bars 1611. [

A plurality of second support brackets 1628a may protrude from the first support bracket 1628a so that a portion of the first guide bar 1611 may be received.

The roller 1628c may be rotatably mounted on the second support bracket 1628b to be in contact with the first guide bar 1611. [ For example, the roller 1628c may be a V-roller.

Meanwhile, the scum blade unit 162 may further include a scraper 1625.

The scraper 1625 may be disposed on at least one of the plurality of buoyancy scam blades 1621 and 1622 to scrape the scum attached to the inner wall of the digester 200.

For example, the scraper 1625 may be installed on a pair of first buoyancy scum blades 1621 facing each other extending to the inner wall of the digester 200.

Here, the scraper 1625 may be attached to the sub-buoyancy box 1626 installed in the first buoyancy screaming blade 1621 (1622). For example, the scraper 1625 may be formed of rubber.

<Fourth Embodiment>

FIG. 21 is a bottom view for explaining a scum removing device applied to a leak preventive multi-shaft stirrer for a fire extinguisher provided with a water level-associated scum removing device according to a fourth embodiment of the present invention.

The leakage preventing type multi-shaft agitator for fire extinguishers equipped with the water level interlock type scum removing device according to the present embodiment is different from the conventional one except that the guiding unit of the scum removing device is omitted, Axis stirrer, description of the remaining components except for the guide unit will be omitted.

Referring to FIG. 21, the guide unit is rotated by receiving the rotational force of the first shaft 130 (see FIG. 5) and may be penetrated by the second shaft 140 (see FIG. 5).

For example, the guide unit 161 includes a first rotating plate 1610, a first guide bar 1611, a longitudinal stiffener 1615, a first transverse stiffener 1616, and a second transverse stiffener 1617 .

The first rotary plate 1610 may be detachably connected to the first shaft 130 to be rotatably received through the first shaft 130 by the rotational force of the speed reducer 120 (see FIG. 5). 14, a through hole 1610a is formed in the first rotating plate 1610 so that the through hole 1610a can be penetrated by the second shaft 140 have.

The first rotating plate 1610 may further include a plurality of holes 1610b for reducing the weight of the first rotating plate 1610. [

A plurality of first guide bars 1611 may be spaced apart from each other by a predetermined distance so as to be in close contact with a pair of adjacent floating scream blades 1621 and 1622 and may be coupled to the first rotating plate 1610.

A plurality of the longitudinal stiffeners 1615 may be spaced apart from each other by a predetermined distance between a pair of adjacent floating scream blades 1621 and 1622.

The first transverse stiffener 1616 may be reinforced by connecting adjacent first guide bars 1611 to each other.

The second transverse stiffener 1617 may be reinforced by connecting neighboring longitudinal stiffeners 1615 and may be reinforced by connecting the longitudinal stiffener 1615 and the first guide bar 1611 to each other.

Again, referring to Figs. 1 to 21, the operation and effect of the leakage preventing multi-axis stirrer for a fire extinguisher equipped with the water level interlocking type scum removing device according to the present invention will be described.

Referring to FIGS. 1 to 21, in the fire extinguisher 100 according to the present invention, any one of rotational forces separated by at least two by the speed reducer 120 is output through the second shaft 140, The mixture in the digestion tank 200 is stirred by rotating the impeller 150.

The lower end 152c of the blade 152 of the first impeller 150 is parallel to the bottom surface 210 of the digester 200 so that the blade 152 and the bottom surface 210 of the digester 200 The first impeller 150 and the second impeller 150 can be installed on the agitator 100 without being restricted by the installation position of the first impeller 150, The sludge mixture sitting on the bottom surface 210 is pushed and moved upward along the bottom surface 210 of the upward incline digestion tank 200 from the central portion toward the corner portion so as to be evenly stirred over the entire digestion tank 210 So that the water treatment efficiency of the digester 200 can be greatly improved.

In consideration of the fact that the first impeller 150 has the lowest flow velocity at the root 152b portion of the blade 152 and the highest flow velocity at the tip 152a portion of the blade 152, Is gradually increased from the portion of the tip 152a to the portion of the root 152b on the hub 151 side.

Accordingly, since the flow rate gradually increases from the tip 152a of the blade 152 toward the hub 151 side, the sludge submerged on the lower side of the hub 151 of the first impeller 150 can be smoothly introduced into the digester 200 can be pushed up toward the sidewall of the digester 200 along the bottom surface 210 so as to be stirred, so that the stirring efficiency can be further improved.

The blades 152 of the first impeller 150 are formed in a convex spiral shape in the rotating direction so that when the first impeller 150 rotates, the sludge mixture is pushed at an obtuse angle by the blades 152, The sludge mixture in the portion of the root 152b of the blade 152 can be slid along the blade 152 along the blade 152 without causing a local turbulence phenomenon so that the stirring efficiency can be further improved do.

In addition, the first impeller 150 is formed in a spiral shape convex in the direction opposite to the rotation of the blade 152 so that the vertical width of the first impeller 150 is constant from the tip 152a of the blade 152, The tip 152a of the blade 152 is inclined upwardly from the tip 152a of the blade 152 so as to have the same inclination as the lower end 152c of the blade 152, The sludge mixture discharged from the portion of the root 152b of the blade 152 along the blade 152 to the tip 152a of the blade 152 is collected and pushed out of the blade 152 to raise the sludge mixture The sludge mixture discharged from the portion of the root 152b of the blade 152 along the blade 152 to the tip 152a portion of the blade 152 exerts a greater thrust force Along the said digester (200), a bottom surface 210 and to improve further the efficiency by stirring to rise toward the upper digester 200.

Further, since the first impeller 150 is not limited by the size and installation space, it can greatly improve the stirring efficiency of the sludge mixture, and collects sludge having a high specific gravity such as sewage sludge, manure sludge, food sludge, It is possible to apply the present invention to the digestion tank 200 which can be treated without any difficulty, so that it is possible to drastically reduce facility costs such as wastewater or sewage treatment plant.

Since the second shaft 140 can rotate not only the first impeller 150 but also the second impeller 170 capable of moving the mixture located in the upper portion of the digestive tank 200 to the lower portion of the digestive tank, So that the stirring efficiency can be further improved.

At the same time, in the case of scum floating on the water surface of the mixture filled in the digestion tank 200, the rotating force, which is output through the first shaft 130 among the rotational forces separated by the decelerator 120, The flocculant scum blades 1621 and 1622 are always placed on the water surface while being lifted along the guide unit 161 while interlocking with the water level of the mixture filled in the digestion tank 200, So that it can be removed by the scum blade unit 162 to always provide the best scum removing effect irrespective of the level of the mixture filled in the stirring tank 200.

That is, in the case of a scum removing device installed in a leakage preventive type multi-shaft stirrer for a fire extinguisher equipped with a general water level interlocking type scum removing device, the water level interlocking type scum removing device is installed in a fixed form without depending on the water level of the mixture filled in the digestion tank It is installed in a leak-proof multi-shaft stirrer for a fire extinguisher installed. Therefore, when the scum removing device is located on the water surface of the mixture filled in the digestion tank or below the water surface, there is a problem that the scum removing effect by the scum removing device is very small due to the characteristics of the scum floating on the water surface .

On the other hand, in the case of the anti-leakage type multi-axis agitator for fire extinguishers equipped with the water level interlock type scum removing device according to the present invention, even if the level of the mixture filled in the digestion tank 200 fluctuates, The buoyancy scum blades 1621 and 1622 are always located on the water surface regardless of the level of the mixture filled in the digester 200 by the buoyancy so that the scum blade unit 162 is moved up and down along the guide unit 161 do.

Although the scum blade unit 162 is moved up and down along the guide unit 161 by buoyancy depending on the level of the mixture filled in the digester 200, The rotational force of the decelerator 120 is transmitted to the scum bladder unit 1621 stably regardless of the position of the scum blade unit 162 by applying a rotational force to the buoyancy box 1627 or the scum blades 1621 and 1622 by the rotating shaft 1611. [ 162 to rotate the scum blades.

Therefore, even if the water level of the mixture filled in the digestion tank 200 changes, irrespective of the water level of the mixture filled in the digestion tank 200, the leakage preventing multi-axis stirrer for digestion tank provided with the water level- There is an advantage that the uniform scum removing efficiency can always be maintained.

In addition, the leak preventive multi-shaft stirrer for a fire extinguishing system equipped with the water level interlock type scum removing device according to the present invention is characterized in that the floating scum blades 1621 and 1622 remove the scum floated on the surface of the mixture, The scum attached to the inner wall of the stirring tank 200 can be removed by the scraper 1625 installed in the buoyancy scam blades 1621 and 1622 as the first and second scoops 1621 and 1622 are rotated, There is an advantage to be improved.

As described above, the multi-shaft agitator 100 for a fire extinguishing system for a fire extinguishing system according to the present invention, in which the lower end 152c of the blade 152 of the first impeller 150 is installed on the bottom surface of the digester 200 The interference between the blade 152 and the bottom surface 210 of the digester 200 does not occur so that the first impeller 150 can be installed in the agitator without limitation of the size and installation position In addition, when the first impeller 150 is rotated, the sludge mixture sitting on the bottom surface of the digester 200 is pushed by the blade 152, and the bottom surface of the digester 200, which is inclined upward from the center portion toward the corner, (210) so as to be evenly stirred throughout the digester (200).

The leakage preventing type multi-shaft agitator 100 for a fire extinguishing system according to the present invention is constructed such that the blade 152 of the first impeller 150 has a cross sectional area ranging from the tip 152a to the hub 151 side The flow rate of the first impeller 150 is gradually increased from the tips 152a of the blades 152 toward the hub 151. Therefore, The sludge submerged in the lower side can be smoothly pushed up to the sidewall of the digester 200 along the bottom surface 210 of the digestion tank 200 and can be stirred to improve the stirring efficiency.

The leakage preventive multi-shaft agitator 100 for a fire extinguishing system according to the present invention, in which the water level interlock type scum removing device according to the present invention is installed, is configured such that the blade 152 of the first impeller 150 is formed in a spiral shape convex in the rotational direction, 150 allows the sludge mixture to slide along the blade 152 in the direction of the blade tip 152a without causing localized turbulence.

In addition, the first impeller 150 is formed in a spiral shape having a constant vertical width and a convex shape opposite to the rotation direction of the blade 152, and at the same time has the same inclination as the lower end 152c of the blade 152 The sludge discharged from the portion of the root 152b of the blade 152 to the portion of the tip 152a of the blade 152 along the blade 152 includes an impelling force improving tip portion 153 extending from the tip 152a portion of the blade 152, The mixing efficiency can be further improved by causing the mixture to rise to the upper side of the digester 200 along the bottom surface 210 of the digester 200 with greater thrust.

As described above, the leak preventive multi-shaft agitator 100 for a fire extinguishing system equipped with the water level interlock type scum removing device according to the present invention allows the first impeller 150 to be installed without being limited in size and installation position, The sludge mixture that has settled on the bottom surface 210 of the digester 200 through the impeller 150 is moved upward along the inclined bottom surface 210 of the digester 200 with a larger thrust, It is possible to stir the high-concentration sludge throughout the digester 200 even if only one first impeller 150 is installed, thereby reducing the manufacturing cost and operating cost of the stirrer 100 and improving the stirring efficiency, Can be greatly improved.

The leak preventive multi-shaft agitator 100 for a fire extinguishing system according to the present invention includes a first and a second impeller 150 rotated by a second shaft 140 connected to the speed reducer 120 The scum bladder unit 162 is moved by the buoyancy force along the guide unit 161 to the water level of the mixture in the digestion tank 200 irrespective of the level of the filled mixture in the digestion tank 200 So that the scum floating on the surface of the mixture is always removed in a state where the buoyancy scom blades 1621 and 1622 are always located on the water surface to provide a constant scum removing efficiency, .

Further, the floating scum blades 1621 and 1622 are rotated to remove scum floating on the water surface of the mixture and to remove scum adhered to the inner wall of the digestion tank 200, thereby further improving water treatment efficiency have.

As described above, the leakage-preventing multi-axis agitator 100 for a fire extinguishing system for a fire extinguishing system according to the present invention has the effect of significantly improving the stirring efficiency and ultimately greatly improving the water treatment efficiency of the digester. .

The leakage preventing multi-shaft agitator 100 for a fire extinguishing system according to the present invention includes a digester 200 capable of treating sludge having a high specific gravity, such as sewage sludge, manure sludge, food sludge, ) Can be applied without any difficulty, so that it is possible to drastically reduce facility costs such as wastewater or sewage treatment plants.

While the present invention has been described in connection with what is presently considered to be practical and exemplary embodiments, it is to be understood that the invention is not limited to the disclosed embodiments, but, on the contrary, It will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined by the appended claims.

(110): Driving means (120): Reduction gear
(130): first shaft (140): second shaft
(150): first impeller (160): scum removing device
(170): second impeller

Claims (37)

A decelerator that decelerates the rotational force of the driving means into at least two and decelerates them at a predetermined ratio;
A first shaft for receiving and outputting any one of at least two rotational forces decelerated at a predetermined ratio by the decelerator;
A second shaft for receiving and outputting another one of at least two rotational forces decelerated and output at a predetermined ratio by the speed reducer;
A first impeller installed at a lower end of the second shaft so as to be rotated in conjunction with the second shaft and at least one blade formed so that at least a part of the lower end is gradually inclined downward from a tip portion toward a hub; And
And a scum removing device that is rotated by receiving a rotational force from the first shaft and is lifted and lowered according to a level of the mixture filled in the stirring tank. The method according to claim 1,
Wherein the first impeller comprises:
Wherein the hub is coupled to the hub so that the blade is perpendicular to the upper and lower surfaces of the hub. The method according to claim 1,
Wherein the first impeller comprises:
Wherein at least a part of the lower end of the blade is formed so as to be inclined downwardly from a tip portion toward a hub side at an inclination angle corresponding to an inclination angle of the bottom surface of the digester. The method according to claim 1,
Wherein the first impeller comprises:
Wherein the cross-sectional area of the blade is gradually increased from the tip portion toward the hub side. The method according to claim 1,
Wherein the first impeller comprises:
Wherein the blade is formed in a spiral shape convex in the rotating direction. The multi-shaft agitator according to claim 1, The method according to claim 1,
Wherein the first impeller comprises:
Wherein a portion of the lower end of the blade adjacent to the hub is formed to be horizontal with the lower surface of the hub. The method according to claim 1,
Wherein the first impeller comprises:
Further comprising a driving force improving tip portion extending from the tip portion of the blade so as to have a constant upper and lower width. 8. The method of claim 7,
The thrust propulsion tip includes:
Wherein the slider is formed in a spiral shape convex in the direction opposite to the rotation of the blade. 8. The method of claim 7,
The thrust propulsion tip includes:
Wherein the tip portion is formed so as to extend upward from the tip portion of the blade toward the end portion of the blade. 10. The method of claim 9,
The thrust propulsion tip includes:
And the lower end of the blade is extended to the tip portion so as to be inclined upward from the tip portion of the blade toward the end portion so as to have the same slope as the lower end portion of the blade. Leakage preventing type multi-shaft stirrer. The method according to claim 1,
Wherein the first impeller comprises:
And a strength reinforcing member attached between the neighboring blades to reinforce the strength of the blade. The multi-shaft agitator according to claim 1, 12. The method of claim 11,
The strength-
Wherein the scum removing device is formed in a plate shape. 12. The method of claim 11,
Wherein the first impeller comprises:
Further comprising at least one hole portion formed in the strength reinforcing member. The multi-shaft agitator according to claim 1, 12. The method of claim 11,
The strength-
Wherein the plurality of blades are disposed so as to be perpendicular to the blades and are attached between neighboring blades. The method according to claim 1,
Wherein the scum removing device comprises:
A guide unit rotated by receiving the rotational force of the first shaft and penetrated by the second shaft; And
A hub which is slidably inserted into the guide unit to be lifted and lowered along the guide unit and penetrated by the second shaft, and a hub which is radially disposed on the hub and which is received in the rotational force of the guide unit, And a scum blade unit composed of a plurality of buoyancy scom blades which are lifted and lowered together with the hub along the guide unit according to the level of the stirring tank. 16. The method of claim 15,
The guide unit includes:
A first rotary plate detachably connected to the first shaft to be rotatably received through the first shaft and penetrated by the second shaft; And
The buoyancy scum blades of the present invention are characterized in that the buoyancy scum blades of the first rotating plate and the buoyancy scum blades are connected to each other through a guide hole, And a plurality of first guide bars arranged to be interposed between the adjacent buoyancy scam blades so as to guide the scum blades and to be coupled to the first rotation plate, wherein the water level interlocking type scum removing device is provided with a leakage- . 17. The method of claim 16,
The guide unit includes:
Further comprising a second rotating plate coupled to the plurality of first guide bars and penetrated by the second shaft. 17. The method of claim 16,
The guide unit includes:
A pair of second guide bars arranged in a triangular shape to be in close contact with the pair of adjacent buoyancy scam blades and coupled to the first rotating plate; And
Further comprising a plurality of reinforcing members for connecting the adjacent first and second guide bars to each other. 16. The method of claim 15,
The guide unit includes:
A first rotary plate detachably connected to the first shaft to be rotatably received through the first shaft and penetrated by the second shaft;
A plurality of first guide bars spaced apart from each other by a predetermined distance so as to be in close contact with the pair of adjacent buoyancy scam blades and coupled to the first rotating plate;
A plurality of longitudinal stiffeners disposed to be spaced apart from each other by a predetermined distance between the adjacent pair of buoyant scom blades;
A plurality of first transverse reinforcement members connecting and reinforcing the adjacent first guide bars to each other; And
And a plurality of second transverse stiffeners that connect and reinforce the adjacent longitudinal stiffeners to each other while connecting the longitudinal stiffener and the first guide bars to each other to reinforce the transversal stiffeners. Multi-shaft agitator. 16. The method of claim 15,
The scum blade unit includes:
Further comprising a scraper installed on at least one of the plurality of buoyant scom blades and scraping scum attached to the inner wall of the agitation tank. The method according to claim 1,
Wherein the scum removing device comprises:
A guide unit that is rotated by receiving a rotational force of the speed reducer through a first shaft and is received by a rotational force from the speed reducer and passed through a second shaft for rotating the impeller; And
A buoyancy box which is lifted along the guide unit according to the level of the stirring tank and penetrated by the guide unit so as to be rotated by receiving the rotational force of the guide unit and penetrated by the second shaft, And a scum blade unit comprising a sliding engagement portion formed in the buoyancy box and a plurality of buoyancy scombal blades radially disposed in the buoyancy box. 22. The method of claim 21,
The guide unit includes:
A first rotary plate detachably connected to the first shaft to be rotatably received through the first shaft and penetrated by the second shaft;
A plurality of first guide bars guiding a buoyancy box that is lifted and lowered according to a level of the stirring tank and connected to the first rotation plate to penetrate the buoyancy box and transmit the rotational force of the first rotation plate to the buoyancy box; And
And a second rotating plate coupled to the first guide bar and penetrated by the second shaft. The multi-shaft agitator according to claim 1, 22. The method of claim 21,
Wherein the sliding engagement portion includes:
A plurality of support brackets protruding from the buoyancy box; And
And a plurality of rollers rotatably mounted on the support bracket so as to be in close contact with the first guide bar of the guide unit. 22. The method of claim 21,
The scum blade unit includes:
Further comprising a scraper installed on at least one of the plurality of buoyant scom blades and scraping scum attached to the inner wall of the agitation tank. The method according to claim 1,
Further comprising at least one second impeller installed on the second shaft, wherein the water-level interlocking type scum removing device further comprises a second impeller disposed on the second shaft. 26. The method of claim 25,
The second impeller
As the blade rotates, a part of the fluid that strikes the blade is passed through the blade toward the rear side of the blade at an increased flow rate to generate vortex and turbulence at the rear side of the blade to improve stirring efficiency, And at least one injection hole provided in the blade so as to add driving force in a rotating direction of the blade. 27. The method of claim 26,
The injection hole
Wherein the plurality of blades are spaced apart from each other by a predetermined distance in at least a row in the longitudinal direction of the blades. 28. The method of claim 27,
The injection hole
Wherein the cross-sectional area of the blade is gradually decreased from a root portion to a tip portion of the blade. 28. The method of claim 27,
Wherein the injection holes formed in the respective rows in the longitudinal direction of the blades are formed so as to alternate with the injection holes formed in the neighboring columns. 28. The method of claim 27,
Wherein the injection holes formed in the same row in the longitudinal direction of the blades are arranged so that the center lines of the injection holes and the injection holes adjacent to each other are perpendicular to each other. 27. The method of claim 26,
The injection hole
Wherein the plurality of blades are formed on a root portion side of the blades so that a plurality of the blades are spaced apart from each other by a predetermined distance in a longitudinal direction of the blades. 27. The method of claim 26,
The injection hole
A first hole formed in the blade in such a manner that a cross-sectional area thereof is gradually increased so as to allow a part of the fluid that hits the blade to pass at an increased flow rate while forming a vortex to the rear side of the blade; And
And a second hole formed in the blade so as to be disposed at a position corresponding to the first hole and rotated 180 degrees from the first hole with respect to the blade surface. 33. The method of claim 32,
Wherein the first hole portion and the second hole portion are formed to have the same cross-sectional area. 33. The method of claim 32,
Wherein the first hole portion and the second hole portion are formed to have different sectional areas from each other. 35. The method of claim 34,
Wherein a hole portion of the first hole portion and the second hole portion having a large cross-sectional area is disposed to face the root portion side of the blade, and the hole portion having a small cross-sectional area is disposed to face the tip portion of the blade. Multi-shaft agitator. 33. The method of claim 32,
The injection hole
Further comprising a connecting portion formed on the blade to allow the first hole portion and the second hole portion to communicate with each other. 37. The method of claim 36,
Wherein the connecting portion is formed to have a smaller cross sectional area than the first and second hole portions.

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