KR102075112B1 - Auto back flushing filter system combining centrifugal separation and candle type membrane filtration - Google Patents

Abstract

An automatic backwashing filter system is disclosed. The automatic backwashing filter system according to embodiments of the present invention includes: a housing which is formed in a chamber shape having an internal space formed therein, in one side of which an inlet having raw water flown in therethrough is formed, and in the other side of which an outlet having filtered water discharged therethrough is formed; a filter module which includes one or more filter units disposed in parallel to each other in the internal space of the housing, formed of a porous material having a plurality of filtration holes formed therein, and having an inner part formed to be hollow such that water is moved through the filtration holes and alien substances are filtered by the filtration holes; a shaft module which includes a central shaft installed in a length direction of the filter units in the hollow inner part of the filter units; and a cleaning module which is ascended or descended along the central shaft by a flow of fluid inside the filter units and separates the alien substances adhered to an inner surface of filter units. The cleaning module includes a plurality of blades such that the cleaning module is rotationally ascended along the central shaft by a flow of the fluid when the fluid is flown in from a bottom portion of the filter units; is rotationally descended along the central shaft by the flow of the fluid when the fluid is discharged through the bottom portion of the filter units as the fluid is flown in the filter units from the outside of the filter units; and additionally includes a scraper which is provided in the edge of the blades and comes into contact with an inner circumferential surface of the filter units such that the scraper separates the alien substances adhered to the inner circumferential surface of the filter units by rotation of the cleaning module.

Description

AUTO BACK FLUSHING FILTER SYSTEM COMBINING CENTRIFUGAL SEPARATION AND CANDLE TYPE MEMBRANE FILTRATION}

The present invention relates to a backwash filter system, and more particularly, to an automatic backwash filter system incorporating centrifugal separation and candle-type membrane filtration capable of separating foreign substances in a filter unit using only a flow of fluid without external power.

In general, the backwash filter is composed of a chamber separating the raw water and the filtrate around the backwash filter, the flow path of the fluid from the raw water to the filtrate sequentially becomes the filtration path.

The backwash filter requires a process of washing the foreign matter adhered to the filter body over time and accumulated and contaminated. The backwashing filter flows the fluid in a direction opposite to the filtration path of raw water to shake off the contaminants accumulated in the filter body. The path of is called backwash path.

There are various kinds of such backwash filters depending on the type of filter, the filtration path, and the configuration of the backwash path.

As the simplest structural device of such a backwash filter, a cylindrical filtration member is largely inserted into the filtration tank, one side of the cylindrical filtration member is connected to the outside, and raw water flows in, and the filtration water is discharged toward the outer circumferential surface of the cylindrical filtration member. Filtering path discharged to the outlet formed in the filtration tank and the cleaning mechanism that can selectively wash a portion of the filtration member by detecting the internal pressure difference of the filtration member and a backwashing tube connected to the backwash valve to filter the filtration tank, the outer peripheral surface of the filtration member And a backwash filter for forming a backwashing path leading to the backwashing pipe inside the filtration member.

There are a wide variety of such backwash filters are known, (Patent Document 1) is provided with a rotary brush inside the filter element, the rotary brush having a cleaning brush driven by a rotary blade that rotates automatically by the flow of fluid. A filter element and a filtration device comprising the same are disclosed.

However, the filtering device of (Patent Document 1) has a disadvantage in that the flow rate that can be filtered within a unit time is small because the volume occupied by the brush in the filter element is very large.

Republic of Korea Patent Publication No. 10-2013-0107907

The present invention has been made to solve the above-mentioned conventional problems, the object of the present invention is as follows.

First, the present invention may have a self-cleaning function even as a concise component, and does not require power to remove foreign substances in the filter unit, and thus, to provide an automatic backwash filter system capable of minimizing operating costs.

Second, the present invention is to provide an automatic backwash filter system that can increase the flow rate by miniaturizing the size of the washing module.

The objects of the present invention are not limited to the above-mentioned objects, and other objects that are not mentioned will be clearly understood by those skilled in the art from the following description.

In order to achieve the above object, the present invention has a chamber shape in which the internal space is formed, the inlet is formed with an inlet through which raw water is introduced, and the outlet with which the filtered water is discharged from the other side; The filter module is disposed parallel to each other in the inner space of the housing, and formed of a porous having a plurality of filtration holes, the hollow is formed therein and at least one filter unit to move the water through the filtration hole and to filter foreign matter ; A shaft module including a central shaft installed in the hollow of the filter unit in the longitudinal direction of the filter unit; And a cleaning module that rises or descends along the central axis by the flow of the fluid in the filter unit and removes foreign substances attached to the inner surface of the filter unit, wherein the cleaning module includes a plurality of blades of the filter unit. When the fluid is introduced from the lower portion is rotated along the central axis by the flow of the fluid, when the fluid is introduced from the outside of the filter unit to the fluid discharged through the lower portion of the filter unit to the central axis by the flow of the fluid It further comprises rotating down, the edge of the blade is provided with a scraper in contact with the inner circumferential surface of the filter unit, by the rotation of the cleaning module to remove the foreign matter attached to the inner circumferential surface of the filter unit is further removed. An automatic backwash filter system is disclosed.

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The cleaning module has a central axis penetrating through the center, the coupling portion rotatably coupled to the central axis and the central axis, provided on the outer peripheral surface of the coupling portion to generate a rotational force to the cleaning module in accordance with the flow of the fluid It may include a plurality of the blades.

When the central shaft and the coupling portion is screwed and the washing module rotates by the blade, the central shaft and the coupling portion may be raised or lowered by screwing the central shaft and the coupling portion.

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The scraper may be rotatably installed at the edge of the blade.

Alternatively, the shaft module further includes a plurality of blades coupled to each other by the central axis, and the central axis rotates together by the rotation of the blade, and when the fluid flows from the lower part of the filter unit, the fluid flows. When the blade and the central axis is rotated in one direction, the fluid is introduced into the filter unit from the outside of the filter unit and the fluid is discharged through the lower portion of the filter unit, the blade and the central axis in the flow of the fluid Can rotate in the opposite direction.

The cleaning module may include one or more scrapers whose edges are in contact with the inner circumferential surface of the filter unit, coupled to the central axis, and which are lifted or lowered along the central axis and dropping foreign substances attached to the inner circumferential surface of the filter unit. have.

The washing module is screwed with the central axis is raised or lowered by the rotation of the central axis, the outer peripheral surface may further include a coupling portion provided with the scraper.

Further comprising a discharge module for discharging the foreign matter to the outside using a differential pressure, the discharge module is a first discharge unit for discharging the foreign matter precipitated from the raw water introduced through the inlet using the differential pressure, the filter using the differential pressure It may include a second discharge unit for discharging foreign matter present in the unit and a motor for rotating the filter module so that each of the filter unit can be selectively connected to the second discharge unit.

Referring to the effects of the present invention configured as described above are as follows.

First, according to the automatic backwash filter system of the present invention, it can have a self-cleaning function as a concise component, and there is an advantage of minimizing operating costs because it does not require power to raise, lower and rotate the washing module. .

Second, according to the automatic backwash filter system of the present invention can reduce the size of the washing module to increase the treatment flow rate.

The effects of the present invention are not limited to the above-mentioned effects, and other effects not mentioned will be clearly understood by those skilled in the art from the description of the claims.

The above summary as well as the detailed description of the preferred embodiments of the present application described below will be better understood when read in connection with the accompanying drawings. Preferred embodiments are shown in the drawings for the purpose of illustrating the invention. However, it should be understood that the present application is not limited to the precise arrangements and instrumentalities shown.
1 is a perspective view of an automatic backwash filter system of the present invention;
2 is a cross-sectional view showing a filter unit, a shaft module and a washing module of the automatic backwash filter system according to an embodiment of the present invention;
3 is a view showing a washing module of the automatic backwash filter system according to an embodiment of the present invention;
4 is a view showing the filtration occurs in the automatic backwash filter system according to an embodiment of the present invention;
5 is a view showing a backwash occurs in the automatic backwash filter system according to an embodiment of the present invention;
6 is an enlarged view illustrating portions A and B of FIG. 5;
7 is a cross-sectional view showing a filter unit, a shaft module and a washing module of the automatic backwash filter system according to another embodiment of the present invention;
8 is a view showing a washing module of the automatic backwash filter system according to another embodiment of the present invention;
9 is a view showing the filtration occurs in the automatic backwash filter system according to another embodiment of the present invention;
10 is a view showing a backwash occurs in the automatic backwash filter system according to another embodiment of the present invention; And
FIG. 11 is an enlarged view illustrating portions A and B of FIG. 10.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings. However, the accompanying drawings are only described in order to more easily disclose the contents of the present invention, and the scope of the present invention is not limited to the scope of the accompanying drawings that can be easily understood by those of ordinary skill in the art. You will know.

In describing the embodiments of the present invention, the same components and the same reference numerals are used for the components having the same functions, and are not completely identical to the components of the prior art.

Also, the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. Singular expressions include plural expressions unless the context clearly indicates otherwise. In this application, the terms "comprise" or "have" are intended to indicate that there is a feature, number, step, operation, component, part, or combination thereof described in the specification, and one or more other features. It is to be understood that the present invention does not exclude the possibility of the presence or the addition of numbers, steps, operations, components, components, or a combination thereof.

Hereinafter, an automatic backwash filter system according to an embodiment of the present invention will be described with reference to FIGS. 1 to 6.

1 is a perspective perspective view of an automatic backwash filter system of the present invention, FIG. 2 is a cross-sectional view showing a filter unit, a shaft module, and a washing module of an automatic backwash filter system according to an embodiment of the present invention, and FIG. 3 is an embodiment of the present invention. Figure 4 is a view showing a washing module of the automatic backwash filter system according to an example, Figure 4 is a view showing a state in which filtration occurs in the automatic backwash filter system according to an embodiment of the present invention, Figure 5 is an automatic according to an embodiment of the present invention FIG. 6 is a view illustrating backwashing occurring in the backwash filter system, and FIG. 6 is an enlarged view of portions A and B of FIG. 5.

As shown in FIGS. 1 to 6, the automatic backwash filter system according to an embodiment of the present invention includes a housing 110, a filter module 120, a shaft module 130, a cleaning module 140, and a discharge module 150. ).

The housing 110 has a chamber shape in which an inner space is formed, and an inlet through which raw water is introduced is formed at one side, and an outlet through which filtered water is discharged is formed at the other side.

The filter module 120 is disposed in parallel to each other in the inner space of the housing 110, is formed of a porous having a plurality of filtration holes, the hollow is formed inside the water is moved through the filtration hole and the foreign material is filtered out one The above filter unit 121 is included. The filter module 120 may include filter housings 123 and 110 having a plurality of filters installed therein.

Raw water introduced from the inlet of the housing 110 may be configured to be introduced into the filter unit 121 through the lower portion of the filter unit 121. In addition, the inlet may be formed at a position higher than the lower end of the filter unit 121 to be described later of the housing 110. As a result, in the process of moving the raw water introduced into the housing 110 through the inlet downwards to move to the lower part of the filter, foreign substances having large particles or heavy weights may be primarily precipitated to the lower part of the housing 110. Can be.

As such, as the raw water from which the foreign matter is first removed is passed through the filtration hole, the foreign matter having small particles contained in the raw water may be filtered. In addition, the fluid passing through the filter unit 121 may be discharged to the outside of the housing 110 through the outlet of the housing 110.

The shaft module 130 includes a central shaft 131 installed in the hollow of the filter unit 121 in the longitudinal direction of the filter unit 121, and the washing module 140 is connected to the flow of the fluid in the filter unit 121. As a result, the foreign material attached to the inner surface of the filter unit 121 is removed by rising or falling along the central axis 131.

Discharge module 150 is a component for discharging the foreign matter to the outside by using the differential pressure, it may include a first discharge unit 153, the second discharge unit 155 and the motor 151.

The first discharge part 153 may be connected to the lower portion of the housing 110 to discharge the foreign matter precipitated from the raw water introduced through the inlet using the differential pressure.

The second discharge part 155 may be connected to the lower part of the filter unit 121 to discharge the foreign matter present in the filter unit 121 using the differential pressure. When the foreign matter is discharged through the second discharge part 155, the fluid in the filter unit 121 is sucked by the differential pressure, so that the fluid located outside the filter unit 121 flows into the filter through the filtration hole. Inflow, foreign matter attached to the inner circumferential surface of the filter unit 121 may drop off and be discharged through the second discharge unit 155.

In addition, the motor 151 may rotate the filter module 120 so that each filter unit 121 may be selectively connected to the second discharge unit 155. In order to rotate the filter module 120, the motor 151 may be mechanically connected to the filter housings 123 and 110 to rotate the filter housings 123 and 110.

In one embodiment of the present invention, the shaft module 130 has a central shaft 131 and a central shaft 131 installed in the longitudinal direction of the filter unit 121 at the inner center of the filter unit 121 and the filter unit 121. It may include a fixing part 135 is provided at each of the upper end and the lower end of the filter unit 121 to be fixed to the hole 137 is formed for entering and exiting the fluid. The central axis 131 may be constrained with the fixing part 135 so as not to rotate with respect to the fixing part 135. In addition, the outer circumferential surface of the central axis 131 may be a screw 133 processing for the movement of the cleaning module 140 to be described later.

The cleaning module 140 may include a coupling part 141 and a blade 143. Coupling portion 141 is a cylindrical shape provided to surround the central axis 131 on the outside of the central axis 131, the central axis 131 is formed through the hole, the inner peripheral surface of the central axis 131 A screw corresponding to) may be formed. Blade 143 is provided with a plurality on the outer circumferential surface of the coupling portion 141 may generate a rotational force in both directions to the cleaning module 140 in accordance with the flow of the fluid inside the filter unit 121.

As a result, when the fluid is introduced from the lower portion of the filter unit 121, the blade 143 rotates in one direction by the flow of the fluid so that the washing module 140 rotates up along the central axis 131, and the filter unit 121 When the fluid flows from the outside to the inside of the filter unit 121, the fluid is discharged through the lower portion of the filter unit 121, the blade 143 is rotated in the opposite direction by the flow of the fluid, the cleaning module 140 along the central axis 131 Can rotate and descend.

Here, as described above, the central shaft 131 and the coupling portion 141 are screwed together, but there is very little play between the central shaft 131 and the coupling portion 141 so that the rotation is easy even by the flow of the fluid. It can be configured to be.

The cleaning module 140 may further include a scraper 145. The scraper 145 may be provided to contact the inner circumferential surface of the filter unit 121 at the edge of the blade 143. Therefore, the scraper 145 may drop off the foreign matter attached to the inner circumferential surface of the filter unit 121 while the washing module 140 rotates and rises or falls. The scraper 145 may be rotatably installed at the edge of the blade 143 to improve cleaning efficiency. In addition, a portion of the scraper 145 contacting the inner circumferential surface of the filter unit 121 may have a brush shape.

The automatic backwash filter system according to an embodiment of the present invention has been described above.

Hereinafter, an automatic backwash filter system according to another embodiment of the present invention will be described with reference to FIGS. 7 to 11.

7 is a cross-sectional view showing a filter unit, a shaft module and a washing module of the automatic backwash filter system according to another embodiment of the present invention, Figure 8 is a view showing a washing module of the automatic backwash filter system according to another embodiment of the present invention, 9 is a view showing a state in which filtration occurs in the automatic backwash filter system according to another embodiment of the present invention, Figure 10 is a view showing a state in which backwash occurs in the automatic backwash filter system according to another embodiment of the present invention and FIG. FIG. 10 is an enlarged view illustrating portions A and B of FIG. 10.

As shown in FIGS. 7 to 11, the automatic backwash filter system according to an embodiment of the present invention includes a housing 210, a filter module 220, a shaft module 230, a washing module 240, and a discharge module 250. ).

Here, the housing 210, the filter module 220 and the discharge module 250 is the same as the embodiment of the present invention, description of the same components will be omitted.

However, in the present embodiment, the shaft module 230 has a central shaft 231 and a central shaft 231 installed in the longitudinal direction of the filter unit 221 at the inner center of the filter unit 221 to the filter unit 221. In order to fix the upper and lower ends of the filter unit 221, respectively, the fixing portion 237, the plurality of fixed to the central axis 231 is formed with a hole 238 for entering and exiting fluid is constrained against each other rotation It may include a blade 235. Therefore, the central axis 231 may rotate together by the rotation of the blade 235. That is, when the fluid is introduced from the lower portion of the filter unit 221, the blade 235 and the central axis 231 rotates in one direction by the flow of the fluid, and the inside of the filter unit 221 from the outside of the filter unit 221 When the fluid flows into the discharged through the lower portion of the filter unit 221, the blade 235 and the central axis 231 in the flow of the fluid may be rotated in the opposite direction. In order to smoothly rotate the central shaft 231, a bearing 239 may be provided between the central shaft 231 and the fixing part 237.

In addition, the washing module 240 of the present embodiment is provided so that the edge is in contact with the inner circumferential surface of the filter unit 221, coupled to the central axis 231 is raised or lowered along the central axis 231 and the filter unit 221 It may include one or more scrapers (243) for removing the foreign matter attached to the inner peripheral surface of the. A portion of the scraper 243 in contact with the inner circumferential surface of the filter unit 221 may have a brush shape. In addition, the cleaning module 240 may further include a coupling part 241 that surrounds a portion of the outer circumferential surface outside the central axis 231 and is provided to be raised or lowered with respect to the central axis 231. The scraper 243 is provided on the outer circumferential surface of the coupling portion 241, and may rise or descend with the coupling portion 241.

Referring to the structure for the rise and fall of the cleaning module 240 as follows.

Screws 233 may be formed on the outer circumferential surface of the central axis 231 and the inner circumferential surface of the coupling portion 241 to correspond to each other. The washing module 240 rotates as the blade 235 and the fixed central shaft 231 rotate, but the washing module 240 is raised or lifted by the friction force between the washing module 240 and the inner circumferential surface of the filter unit 221. Can descend. In other words, the rotational force of the central axis 231 may be transmitted in part by the rotation of the washing module 240 and another part by the rising or falling of the washing module 240.

Alternatively, screws 233 may be formed on the outer circumferential surface of the central axis 231 and the inner circumferential surface of the coupling portion 241 to correspond to each other. And, the inner circumferential surface of the filter unit 221 is protruded to the inside of the filter unit 221 and has a guiding protrusion having a length in the longitudinal direction of the filter unit 221, the cleaning module 240, a part of the guiding protrusion The guiding groove may be formed. Accordingly, when the blade 235 is rotated by the flow of the fluid, the blade 235 and the fixed central axis 231 is rotated, the cleaning module 240 is guided by the guiding protrusion and the guiding groove to clean the cleaning module ( 240 may rise or fall without rotation. On the contrary, the guiding protrusion may be formed in the washing module 240, and the guiding groove may be formed on the inner circumferential surface of the filter unit 221.

Alternatively, a guiding protrusion may be formed on the outer circumferential surface of the central axis 231 along the longitudinal direction of the central axis 231, and a guiding groove corresponding to the guiding protrusion may be formed on the inner circumferential surface of the coupling portion 241. In other words, the washing unit may be coupled to the central axis 231 to rise or fall but impossible to rotate relative. Accordingly, the blade 235 and the fixed central axis 231 is rotated by the flow of the fluid, and the cleaning module 240 may rotate together with the rotation of the central axis 231. At the same time, when the fluid has a rising flow inside the filter unit 221, the washing module 240 may rise by the flow of the fluid, and when the fluid has a falling flow, the washing module 240 may descend. To this end, there is very little play between the central axis 231 and the inner peripheral surface of the coupling portion 241 may be configured to easily move the cleaning module 240 by the flow of the fluid. In addition, the guiding protrusion may be formed in the coupling part 241, and the guiding groove may be formed in the central axis 231.

The operation of the automatic backwash filter system of the present embodiment will be described below.

Raw water flows in through the inlet 211 of the housing 210 and moves to the lower side of the housing 210 to move the introduced raw water to the filter unit 221. In this process, foreign matter with large particles contained in the raw water may be primarily precipitated. Here, the precipitated foreign matter may be discharged to the outside through the first discharge part 253 connected to the lower portion of the housing 210.

Raw water from which foreign matter is first separated is introduced into the lower portion of the filter unit 221 and discharged to the outside of the filter unit 221 to pass through the filter unit 221. As the raw water passes through the filter unit 221, foreign matters having small particles are separated into secondary, and the fluid filtered as described above may be discharged to the outside through the discharge port 213 formed in the housing 210.

At this time, in the process of the raw water is introduced from the lower portion of the filter unit 221 and discharged to the outside of the filter unit 221, the rising flow of the fluid occurs inside the filter unit 221, the blade by the rising flow of the fluid 235 rotates to one side and rotates the central axis 231, and at the same time, the scraper 243 may rise along the central axis 231 and drop off the foreign matter attached to the inner circumferential surface of the filter unit 221.

The foreign matter in the filter unit 221 may be discharged through the second discharge unit 255 by the differential pressure. The foreign matter in the filter unit is sucked through the second discharge unit 255 by the differential pressure, and fluid outside the filter unit 221 may be introduced into the filter unit 221 through the filtration hole by suction. As the fluid flows into the inside of the filter unit 221 through the filter unit 221, some foreign substances attached to the inner circumferential surface of the filter unit 221 may be removed. In addition, the suction flow occurs inside the filter unit 221 by suction, so that the blade 235 rotates in the opposite direction, and thus the center shaft 231 and the scraper 243 rotatably coupled thereto are lowered. The foreign matter attached to the inner circumferential surface of the filter unit 221 may be dropped off, and at the same time, the fluid containing a large amount of the foreign matter may be pressed downward to assist the discharge through the second discharge part 255.

Thus, according to the automatic backwash filter system of the present invention can have a self-cleaning function as a concise component, and minimizes the operating costs because it does not require power to raise, lower and rotate the cleaning modules (140, 240). There are advantages to it.

In addition, the volume of the cleaning module (140, 240) is minimized to effectively separate the foreign matter attached to the filter unit (121, 212) without significantly affecting the flow of the fluid.

As described above, a preferred embodiment according to the present invention has been described, and the fact that the present invention can be embodied in other specific forms in addition to the above-described embodiments without departing from the spirit or scope thereof has ordinary skill in the art. It is obvious to them. Therefore, the above-described embodiments should be regarded as illustrative rather than restrictive, and thus, the present invention is not limited to the above description and may be modified within the scope of the appended claims and their equivalents.

110, 210: housing
120, 220: filter module
130, 230: axis module
140, 240: cleaning module
150, 250: discharge module

Claims (10)

A housing having a chamber shape in which an inner space is formed, one side of which is formed with an inlet through which raw water is introduced, and the other side with a discharge outlet through which filtered water is discharged;
The filter module is disposed in parallel to each other in the inner space of the housing, formed of a porous having a plurality of filtration holes, the hollow is formed therein and at least one filter unit to move the water through the filtration hole and to filter foreign matter ;
A shaft module including a central shaft installed in the hollow of the filter unit in the longitudinal direction of the filter unit;
And a washing module that rises or descends along the central axis by the flow of the fluid in the filter unit and removes the foreign matter attached to the inner surface of the filter unit.
The washing module includes a plurality of blades, and when fluid is introduced from the bottom of the filter unit, the washing module rotates along the central axis by the flow of the fluid, and fluid is introduced into the filter unit from the outside of the filter unit. When the fluid is discharged through the lower portion further comprises rotating down along the central axis by the flow of the fluid,
The edge of the blade is provided with a scraper in contact with the inner circumferential surface of the filter unit, the automatic backwash filter system further comprises removing the foreign matter attached to the inner circumferential surface of the filter unit by the rotation of the cleaning module. delete The method of claim 1,
The washing module,
A coupling part penetrating the central axis in a center thereof and rotatably coupled to the central axis and the central axis;
A plurality of blades provided on an outer circumferential surface of the coupling part to generate rotational force to the cleaning module according to the flow of the fluid;
Automatic backwash filter system comprising a. The method of claim 3, wherein
And the central shaft and the coupling part are screwed together, so that the washing module rotates by the blades, thereby raising or lowering by the screw coupling of the central axis and the coupling part. delete The method of claim 1,
The scraper is,
Automatic backwash filter system rotatably installed on the edge of the blade. The method of claim 1,
The shaft module,
The central axis is rotated together by the rotation of the blade further comprises a plurality of blades coupled to each other and the central axis, when the fluid flows from the lower portion of the filter unit by the flow of the fluid and the blade and the central axis This blade rotates in one direction, and when the fluid is introduced into the filter unit from the outside of the filter unit and the fluid is discharged through the lower part of the filter unit, the blade and the central axis rotate in the opposite direction to the flow of fluid. Backwash filter system. The method of claim 7, wherein
The washing module,
An automatic backwash filter system having an edge coupled to the inner circumferential surface of the filter unit, the at least one scraper coupled to the central axis to move up or down along the central axis and to remove foreign substances attached to the inner circumferential surface of the filter unit. The method of claim 8,
The washing module,
Automatically backwash filter system is screwed with the central axis is raised or lowered by the rotation of the central axis, the outer peripheral surface further comprises a coupling portion provided with the scraper. The method of claim 1,
Further comprising a discharge module for discharging the foreign matter to the outside using the differential pressure, the discharge module,
A first discharge part for discharging the foreign matter precipitated from the raw water introduced through the inlet by using a differential pressure;
A second discharge part for discharging foreign matter present in the filter unit by using a differential pressure; And
A motor for rotating the filter module such that each of the filter units can be selectively connected to the second outlet;
Automatic backwash filter system comprising a.

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