KR101731949B1 - Water purifier and backwash method having natural flowing type backwash - Google Patents

Abstract

The present invention relates to a water filtration apparatus having a natural flow type backwash function and a backwash method and, more specifically, relates to a water filtration apparatus having a natural flow type backwash function and a backwash method, wherein the switching to a backwash operation of removing foreign materials in a filtration layer by natural flow under the siphon action is automatically performed when the filtration pressure increases due to a decreased filtration rate of the filtration layer since the foreign materials are accumulated in the filtration layer, so that the backwash management is not required by an administrator and the backwash operation is carried out without additional power supply. According to the present invention the water filtration apparatus having a natural flow type backwash function comprises: a filtration unit which receives external raw water through a raw water introduction unit, and passes the external raw water through a filtration layer having a filter medium filled in an inner space thereof and discharges the same; a purified water storage unit which collects purified water through the filtration unit and supplies the same through a purified water discharge unit; a filtration pressure detection unit which detects a filtration pressure of the filtration unit; a backwash water siphon discharge unit which discharges water in the filtration unit to backwash the filtration under the siphon action, when the filtration pressure of the filtration pressure detection unit is greater than or equal to a predetermined reference value; and a backwash amount determination unit which detects an amount of backwash water discharged through the backwash water siphon discharge unit to control the backwash operation.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a water filtration apparatus and a backwashing method,

More particularly, the present invention relates to a water filtration apparatus and a backwashing method provided with a natural downfall type backwash function. More particularly, the present invention relates to a filtration apparatus and a backwashing method, And the backwashing operation for removing the foreign substances in the filtration layer is automatically performed so that the backwashing management of the manager is unnecessary and the backwashing operation is performed without supplying any additional power, .

Generally, a water filtration system is installed in a water treatment plant where water treatment and management are required, in order to supply water after filtering the water. This water filtration device is also installed in a wastewater treatment plant where water and wastewater are filtered and discharged.

A filter layer filled with a filter material such as sand, carbon, micro filter, iron, iron or manganese is formed in the water filtration unit, and the foreign material is filtered as the water passes through the filtration layer.

However, in the conventional water filtration apparatus, as the use time increases, foreign substances accumulate in the filtration layer, and the treatment efficiency of the raw water decreases, so that the filter medium needs to be replaced frequently.

To solve these problems, a method of backwashing the filter layer has been developed as one of the methods for regenerating the filter medium without having to replace the filter medium while maintaining the filtration efficiency. The backwashing method is a method of regenerating the filtration layer by passing water already filtered in a direction opposite to the integer direction of the filtration layer to the filter to remove foreign matter accumulated in the filtration layer.

In backwashing of such filter media, proper automatic backwashing operation and backwash time setting are important to improve the performance of the filtration layer. In other words, too frequent backwashing and long backwashing may cause the filter material to be damaged due to the lowering of the recovery of raw water (or undiluted solution) due to backwash water discharge and the instantaneous pressure change, The control of the automatic backwash operation is required.

Korean Registered Utility Model No. 20-0432244 (Automatic Backfill System of Water Treatment Plant) and Korean Patent No. 10-1117748 (Backflushing Water Purification System) are automatically controlled to perform backwashing automatically. There is disclosed a water purification apparatus provided with a backwash function for maximizing the backwashing efficiency.

However, in the above-mentioned water filtration apparatus, separate power is used for controlling the backwash automatic operation and controlling the backwashing operation time. In addition, in order to apply the pressure for the raw water flow in the reverse direction for backwashing, There is a problem using large power. Such a backwashing apparatus using the separate power requires maintenance due to occurrence of a fault or the like, and its use is limited in a wall paper or the like in which a large power supply is not smooth.

Registration Utility Model Bulletin 20-0432244 (Automatic Backfill System for Water Treatment Plant), Nov. 29, 2006 Patent Registration No. 10-111774 (Backwash water purification apparatus), Feb. 10, 2012 10.

SUMMARY OF THE INVENTION The present invention has been made in view of the above-described problems, and it is an object of the present invention to provide a method for removing foreign matters from a filtration layer by natural flow under a siphon operation when foreign substances are accumulated in a filtration layer, A water filtration apparatus and a backwashing method provided with a submerged-type backwash function in which a backwash operation is automatically performed.

 It is another object of the present invention to provide a water filtration apparatus and a backwashing method provided with a submerged backwash function that does not require any additional power and does not require backwash management by an administrator and can greatly improve reliability.

The problems to be solved by the present invention are not limited to the above-mentioned problems, and other matters not mentioned can be clearly understood by those skilled in the art from the following description.

In order to accomplish the above object, the present invention provides a water filtration apparatus equipped with a sub-natural backwash function, wherein external raw water is introduced through a raw water inlet (11) and passed through a filtration layer filled with a filter medium in an internal space A filtration unit 20 for collecting the purified water through the filtration unit 20 and supplying purified water through the purified water discharge unit 12; A reverse siphon siphon discharge unit for discharging the water of the filtration unit to the siphon 30 to backwash the filtration unit by a siphon operation when the filtration pressure of the filtration pressure detection unit is equal to or higher than a predetermined reference value, And a backwash amount determining unit for detecting an amount of backwash water discharged through the backwash water siphon discharging unit to control the backwashing operation, wherein the siphon (30) A siphon rising part 31 communicating with the filtration part 20 through a diaphragm 21 dividing the water reservoir part and the filtration part 20 and the siphon down part 31 formed to discharge the reverse water to the outside Wherein the water storage part comprises an upper reservoir part 17 which is an upper part of the partition plate 21 and a lower reservoir part 16 which is a lower part of the filtration part 20. The siphon 30, An exhaust pipe 42 for discharging the air inside the siphon 30 to the outside, a check valve 40 for preventing external air from flowing into the siphon 30, And a backwash water control pipe (43) for communicating with the backwash water supply pipe (17) to control backwash water flow rate. The siphon lowering unit (32) includes a water level sensor (50) And a backwash discharge valve (51) which is opened and closed in response to a detection signal of the water level sensor (50) It characterized in that the flow rate between at least the said level sensor (50) flowing into the siphon descending portion 32 the wash station drain valve 51 to discharge the accumulated debris in the group filtration unit 20.
Meanwhile, the backwashing method of the water filtration apparatus equipped with the natural downfalling backwash function according to the present invention is characterized in that the backwashing of the purified water filtration apparatus having the natural subwatershed backwash function includes: A filtration pressure detecting step of detecting a filtration pressure of the filtration unit through a filtration pressure detection unit, a filtration pressure detection step of detecting a filtration pressure of the filtration unit through a filtration pressure detection unit, A backwash step of backwashing the filtration unit by a siphon operation by discharging the water of the filtration unit to a siphon when the filtration pressure is equal to or higher than a predetermined reference value; Wherein the backwashing step includes a step of returning to the filtration unit (20) before backwashing, A siphon rising portion 31 communicating with the filtration portion 20 through a diaphragm 21 dividing the purified water storage portion and the filtration portion 20 at one end and a siphon rising portion 31 at the other end communicating with the filtration portion 20, The inflow water flows into the siphon rising portion 31 of the siphon 30 including the siphon descending portion 32 formed for discharging the siphon downward portion 32 to the siphon descending portion 32 and the backwash water is filled And the reverse water discharge valve 51 mounted on the lower portion of the siphon descending part 32 is opened when the countertop water is sensed through the water level sensor 50 mounted on the upper part of the siphon descending part 32, Wherein the step of stopping the backwashing includes supplying the outside air to the siphon through the backwash water control pipe when the predetermined backwash water is exhausted through the communication with the purified water storage portion, , And the backwash water quantity It characterized in that the flow rate between at least the siphon above the water level sensor 50 is introduced to the falling part (32) and the wash station drain valve 51 to discharge the accumulated foreign matter on portion 20.

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As described above, when the filtration rate of the filtration layer is lowered due to the accumulation of foreign matter in the filtration layer and the filtration pressure is increased, the filtration apparatus having the natural downfalling backwash function according to the present invention removes foreign matter from the filtration layer The backwashing operation is automatically performed so that the backwashing management of the manager is not required and the convenience of the product is greatly improved.

In addition, since no separate power is used for the backwash operation, the maintenance cost can be minimized.

FIG. 1 is a schematic block diagram for explaining a backwashing method of a water filtration apparatus equipped with a sub-natural backwash function according to an embodiment of the present invention;
FIG. 2 is a schematic view of a water filtration apparatus provided with a sub-natural backwash function according to an embodiment of the present invention;
FIG. 3 is a block diagram of a water purification apparatus provided with a sub-natural backwash function according to an embodiment of the present invention,
4A to 4D are cross-sectional views illustrating an operation state of a water filtration apparatus provided with a sub-natural backwash function according to an embodiment of the present invention.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, a water filtration apparatus and a backwashing method according to the present invention will be described in detail with reference to the accompanying drawings.

FIG. 1 is a schematic block diagram for explaining a backwashing method of an essential filtration apparatus equipped with a sub-natural backwash function according to an embodiment of the present invention. Referring to FIG.

FIG. 2 is a schematic block diagram of a water filtration apparatus provided with a sub-natural backwash function according to an embodiment of the present invention. FIG. 3 is a schematic view of a water sub- 4A to 4D are cross-sectional views illustrating operation states of a water filtration apparatus provided with a sub-natural backwash function according to an embodiment of the present invention.

In the drawings, the same reference numerals are given to the same elements even when they are shown in different drawings. In the drawings, the same reference numerals as used in the accompanying drawings are used to designate the same or similar elements. And detailed description of the configuration will be omitted. Also, directional terms such as "top", "bottom", "front", "back", "front", "forward", "rear", etc. are used in connection with the orientation of the disclosed drawing (s). Since the elements of the embodiments of the present invention can be positioned in various orientations, the directional terminology is used for illustrative purposes, not limitation.

As shown in FIGS. 1 to 4D, the purified water filtration apparatus having the sub-natural backwash function according to the preferred embodiment of the present invention includes a filter unit that receives external raw water through a raw water inlet, A filtration unit for collecting the filtrate through the filtration unit and supplying the purified water through the purified water discharge unit; a filtration pressure detection unit for detecting the filtration pressure of the filtration unit; A reverse siphon siphon discharge unit for discharging the water of the filtration unit to a siphon and backwashing the filtration unit by a siphon operation when the pressure is equal to or higher than a predetermined reference value, And a backwash amount determination unit for detecting the backwashing amount and controlling the backwashing operation.

The filtration unit, the purified water storage unit, and the filtration pressure detection unit may be composed of the purified water filtration tank 10. The water filtration tank 10 is preferably formed of a cylindrical tank having a space for filtering and discharging raw water.

The inner space of the purified water filtration tank 10 is divided into upper and lower spaces by a partition plate 21. The lower space divided by the partition plate 21 is filled with a filter medium such as sand, And the upper space divided by the diaphragm may be composed of an integral water reservoir for temporarily storing the filtered water through the filtration unit 20.

The filtration part 20 is connected to a raw water inflow part 11 for introducing raw water into the upper part and is connected to the filtration part 20 so that the filtration material to be filled in the filtration part 20 is not discharged to the purified water storage part. ), And the filter material is filled between the diaphragm and the perforated plate. The raw water flowing into the upper part of the filtration part 20 through the raw water inflow part is filtered while passing through the filtration layer and the filtered water is discharged to the purified water storage part through the perforated plate.

The purified water collected in the filtration unit 20 may be collected in the purified water storage unit, and a purified water collection pipe connected to the upper space of the partition plate in the lower space of the perforated plate may be installed up and down. And may be composed of a plurality of units.

The reverse siphon siphon discharge portion may be a curved portion that is mounted in communication with the diaphragm and is formed in a U shape across the purified water reservoir portion. That is, the water supplied to the filtration unit can be discharged to the outside through the counter-washed siphon discharge unit by a siphon operation.

The filtration pressure detector detects the filtration pressure of the filtration unit 20 automatically. That is, when foreign matter or the like accumulates in the filtration unit 20 and the filtration pressure rises, the filtered water in the filtration unit 20 can not be discharged to the lower pier plate, but flows out to the reverse siphon siphon discharge unit connected to the diaphragm, Role. The filtration pressure detecting unit may adjust the filtration pressure of the filtration unit 20 according to the amount of foreign matter accumulated in the filtration unit 20 and the size of the through hole formed in the perforated plate, You can control the number of stations you can turn. That is, as the inner diameter of the through hole formed in the perforated plate is increased, the size of the filtration pressure that can be flowed out to the counter discharge water siphon discharge portion is increased. As the inner diameter of the through hole formed in the perforated plate is decreased, The size of the filtration pressure that can be supplied can be reduced.

Therefore, as described above, the filtration pressure of the filtration unit 20 rises due to foreign substances or the like, and when the filtration pressure rises above a predetermined reference value, the water in the filtration unit 20 acts as reverse- The filtration unit is backwashed while being discharged to the counter-wash-water siphon discharge unit.

Meanwhile, the purified water stored in the purified water reservoir is not discharged to the purified water discharger, but is supplied to the discharged water siphon discharger through the purified water collecting pipe and the filtration unit 20. That is, the backwash water flows out by the atmospheric pressure acting on the purified water reservoir and the discharge pressure of backwash water discharged through the backwatershed siphon discharge unit, that is, a siphon operation.

The backwash water discharge can be stopped by the backwash water quantity determination unit. That is, when the flow rate of the purified water storage portion drops to a certain level, the water is sensed and supplied to the backwash water siphon discharge portion to stop the discharge of backwash water through the water discharge portion do.

Accordingly, the discharge of the reverse water through the reverse siphon siphon discharge unit is stopped, and the raw water flowing through the raw water inflow portion is purified through the filtration unit 20 and purified water is supplied to the purified water storage unit.

The backwashing method of the water filtration apparatus equipped with the natural downfalling backwash function according to the present invention having the above-described structure is characterized in that the raw water of the outside is introduced through the raw water inflow portion and discharged through the filtration portion provided with the filtration material A filtration step of collecting the purified water by the filtration unit through a filtration unit and supplying purified water through a purified water discharge unit; a filtration pressure detection step of detecting filtration pressure of the filtration unit through a filtration pressure detection unit; A backwash step of backwashing the filtration unit by a siphon operation by discharging the water of the filtration unit to a siphon when the filtration pressure of the detection unit is equal to or higher than a predetermined reference value; And a backwash stop step of stopping the backwash.

Therefore, the present invention automatically detects the filtration pressure of the filtration unit 20, and when the filtration pressure higher than the reference value is detected, the reversed wash water is discharged to the outside through the reverse siphon siphon discharge unit, Back washable.

In the backwashing step, when the backwash water flows into the siphon, the backwashing step discharges the air inside the siphon to the outside through the exhaust pipe, prevents the outside air from flowing into the siphon, continuously discharges the backwash water to the outside Thereby generating a siphon action.

In addition, the step of stopping the backwash may include the step of supplying external air to the siphon through the backwash water control pipe when the preset backwash water is exhausted through the communication with the purified water storage portion, The water may include a reverse water washoff procedure to block the outflow of the water.

FIGS. 2 to 4D illustrate an apparatus for filtering purified water according to an embodiment of the present invention. Referring to FIG. 2, the apparatus includes a conventional purified water filtration tank 10, And a siphon 30 connected to one side thereof.

The inner space of the purified water filtration tank 10 is divided into upper and lower spaces by a partition plate 21. The lower space divided by the partition plate 21 is filled with a filter medium such as sand, The upper space divided by the partition plate 20 and the upper space formed by the partition plate 21 may consist of a water reservoir for temporarily storing the filtered water through the filtration unit 20.

The filtration part 20 is connected to a raw water inflow part 11 for introducing raw water into an upper part of the filtration part 20 and a perforated plate 23 is attached to the lower part of the filtration part 20 so that the filtration material is caught without being discharged to the purified water reservoir part. And a plurality of through holes 24 are formed in the perforated plate 23.

Therefore, the raw water flowing into the upper part of the filtration part 20 through the raw water inflow part 11 is filtered while passing through the filtration layer, and the filtered water passes through the perforated plate 23, It is supplied to the hand.

The purified water collecting pipe 22 connected to the upper space of the partition plate 21 in the lower space of the perforated plate 23 so as to be supplied to the purified water reservoir through the filtration unit 20 is vertically Respectively. It is preferable that a plurality of the purified water collecting pipes 22 are arranged in a radially symmetrical manner in order to flow smoothly the purified water.

On the other hand, the purified water filtration tank 10 may be provided with a check port 13 or 14 for inspecting the filtration unit 20 by inserting or cleaning the filter medium into the filtration unit 20 on the side wall of the filtration unit 20.

The lower part of the perforated plate 23 serves as a lower reservoir part 16 and the upper part of the diaphragm 21 is connected to the lower part of the upper part of the filtration part 20, And becomes the water storage portion 17.

In addition, the upper reservoir portion 17 is connected to a purified water discharge portion 12 for supplying purified water to the outside, and the lower reservoir portion 16 includes a drain valve 15 for removing foreign substances therein, Can be connected and configured.

The siphon 30 is a kind of a communicating tube which is bent upward to raise the liquid upward to move the liquid to a position lower than the liquid level in the vessel.

The siphon 30 includes a siphon rising part 31 at one end communicating with the filtering part 20 through the partition 21 and a siphon lowering part 31 at the other end for discharging backwash water to the outside 32).

That is, the reverse septic water is discharged to the outside by a siphon operation to backwash the filtration unit 20.

An exhaust pipe 42 for discharging the air inside the siphon 30 to the outside is mounted on the upper end of the siphon 30 to which the siphon rising portion 31 and the siphon descending portion 32 are connected, The check valve 40 is mounted on the siphon 30 so that no external air is introduced into the siphon 30. A backwash water quantity control pipe 43 communicating with the upper water storage tank 17 is installed in the exhaust pipe 42 below the check valve 40. The backwash water quantity control pipe 43 is connected to the upper water storage tank 17 So that the length thereof can be adjusted.

When the backwash water is exhausted, the backwash water control pipe 43 supplies external air to the siphon 30 so that the inside of the siphon 30 is equal to the atmospheric pressure, The washing is stopped. The amount of the backwash water can be controlled by adjusting the length of the backwash water volume control pipe 43.

That is, the air inside the siphon 30 is discharged to the outside through the check valve 40 so that the backwash water flows into the siphon rising portion 31, and the air pressure inside the siphon 30 is prevented from flowing out, And the backwash water is discharged to the outside. When the amount of backwash is exhausted, external air is supplied to stop the siphon operation so that the inside of the siphon 30 is equal to the atmospheric pressure through the backwash water control pipe 43.

The siphon descending part 32 includes a water level sensor 50 for sensing water in the upper part and a reverse water discharge valve 51 opened and closed in response to a detection signal of the water level sensor 50 at the lower side As shown in FIG.

That is, when the backwater is sensed by the water level sensor 50, the backwash water discharge valve 51 is opened to discharge the backwash water to cause the siphon action to occur. When the supply of the reverse waterwash is stopped, (50), and closes the backwash discharge valve (51) to stop the backwashing operation.

The operation of the water filtration apparatus provided with the sub-natural backwash function according to another embodiment of the present invention will be described below.

4A, raw water is supplied through a raw water inlet 11 connected to an upper portion of the filtration unit 20, as shown in FIG. 4A.

The raw water flowing through the raw water inflow portion 11 is filtered through the filtration portion 20 to discharge purified water to the lower reservoir portion 16 through the through hole 24 of the perforated plate 23 mounted at the lower end .

The purified water collected in the lower reservoir portion 16 is collected in the upper reservoir portion 17 through the purified water collection pipe 22 formed through the filtration portion 20, And the purified water is supplied to the outside through the installed purified water discharging portion (12).

In order to smoothly supply the purified water, the ventilation part 18 is mounted on the upper end of the water filtration tank 10.

As described above, if the raw water is filtered through the filtration unit 20 for a predetermined period of time, foreign matter accumulates in the filtration unit 20, and the filtration pressure in the filtration unit 20 increases due to accumulated foreign matter So that the filtration layer can not pass smoothly. As shown in FIG. 4B, a part of the raw water flowing into the filtration part 20 is raised in the siphon rising part 31 due to the increase of the filtration pressure, and the raised water is floated toward the siphon descending part 32 .

At this time, the air filled in the siphon rising portion 31 and the siphon lowering portion 32 is discharged through the exhaust pipe 42, and the siphon rising portion 31 and the siphon lowering portion 32 are filled with backwash water do.

4C, the backwash water discharged to the siphon rising part 31 is filled in the siphon lowering part 32 and the level sensor 50 mounted on the siphon lowering part 32, , And thus, it senses the backwash water absorbed by the water.

When the backwash water is sensed through the water level sensor 50, the backwash water discharge valve 51 is opened to discharge the backwash water to the outside.

The backwash water stored in the filtration unit 20, the lower reservoir unit 16 and the upper reservoir unit 17 by the siphon operation backwashes the filtration unit 20 and discharges the backwash water through the siphon 30 Washing is performed.

That is, the purified water stored in the upper reservoir portion 17 flows backward through the purified water collection pipe 22 and the filtration portion 20 without being discharged through the purified water discharge portion 12, and is discharged to the siphon 30, The filtration unit 20 is backwashed.

Then, as shown in FIG. 4D, the water stored in the upper reservoir portion 17 is discharged to the outside, and the water level is lowered, and the lowered water level is sensed through the backwash water control pipe 43. That is, when the water level is lowered to the end of the backwash water control pipe 43, air is introduced through the backwash water control pipe 43 to change the interior of the siphon rising portion 31 to the same pressure as the atmospheric pressure The siphon operation is stopped.

Accordingly, the supply of the reverse water to the siphon rising portion 31 is interrupted, and the reverse water discharged through the siphon lowering portion 32 is exhausted through the water level sensor 50, The valve 51 is closed to stop the discharge of the reverse water discharge.

The backwash function is performed as described above to discharge the foreign substances in the filtration unit 20 to the outside, thereby lowering the filtration pressure of the filtration unit 20. Therefore, the filtration unit 20 restarts the water purifying function to purify the raw water flowing through the raw water inflow unit 11 to discharge the purified water to the lower storage unit 16 and the upper storage unit 17, And the purified water is supplied through the purified water discharge portion 12.

As described above, the water filtration apparatus provided with the sub-natural backwash function according to the present invention does not require a driving facility such as a separate pump for backwashing operation since the filtration unit is backwashed by the siphon principle.

In addition, the backwash operation for removing the foreign substances in the filtration layer by the natural flow under the siphon operation is automatically performed, so that the backwash management of the manager is not required, and the cost for maintenance can be minimized .

The embodiments of the present invention described above and shown in the drawings should not be construed as limiting the technical idea of the present invention. The scope of protection of the present invention is limited only by the matters described in the claims, and those skilled in the art will be able to modify the technical idea of the present invention in various forms. Accordingly, such improvements and modifications will fall within the scope of the present invention if they are apparent to those skilled in the art.

10: water filtration tank 11: raw water inlet
12: water outlet part 13, 14: check port
15: drain valve 16: lower reservoir part
17: upper reservoir part 18: ventilation part
20: filtration part 21: diaphragm
22: water collection pipe 23:
24: through hole 30: siphon
31: siphon rising portion 32: siphon descending portion
40: Check valve 42: Exhaust pipe
43: Backwash water quantity control tube 50: Water level sensor
51: Reverse water discharge valve

Claims (7)

A filtration unit 20 that receives the raw water from outside through the raw water inlet 11 and passes the filtration layer filled with the filter medium in the internal space and discharges the purified water through the filtration unit 20, A filtering pressure detection unit for detecting a filtration pressure of the filtration unit 20; and a control unit for controlling the water in the filtration unit when the filtration pressure of the filtration pressure detection unit is equal to or higher than a predetermined reference value, a reverse siphon siphon discharge unit for discharging the filtered water to the siphon 30 and backwashing the filtration unit by a siphon operation, and a backwashing unit for detecting the amount of backwash water discharged through the reverse siphon siphon discharge unit, 1. An apparatus for filtering water, comprising:
The siphon 30 includes a siphon rising portion 31 at one end communicating with the filtration portion 20 through a partition plate 21 dividing the purified water storage portion and the filtration portion 20, And a siphon descending part (32) formed for discharging the wash water to the outside,
The purified water storage part is composed of an upper reservoir part 17 which is an upper part of the partition plate 21 and a lower reservoir part 16 which is a lower part of the filtration part 20,
An upper end of the siphon 30 is provided with an exhaust pipe 42 for discharging the air inside the siphon 30 to the outside and a check valve 40 for preventing the outside air from flowing into the siphon 30, And a backwash water control pipe (43) for communicating with the upper reservoir (17) to control backwash water volume,
The siphon descending part 32 includes a water level sensor 50 for sensing water in the upper part and a reverse water discharge valve 51 opened and closed in response to a detection signal of the water level sensor 50 at the lower side Mounted,
The backwash water flow rate is the flow rate between the water level sensor 50 and the backwash water discharge valve 51 that flows into at least the siphon descending part 32 to discharge the foreign substances accumulated in the filtration part 20 The water filtration system is equipped with a natural subsoil backwash function.
delete delete A raw water supply unit for supplying external raw water to the raw water inflow part and discharging the raw raw water through a filtration part provided with a filtration layer filled with a filter medium in the internal space and a water purifier for collecting the purified water water through the filtration part, A filtration pressure detection step of detecting a filtration pressure of the filtration part through a filtration pressure detection part; and a control step of discharging the water of the filtration part as a siphon when the filtration pressure of the filtration pressure detection part is a predetermined reference value or more, And a backwash stop step of stopping the backwash when a predetermined amount of backwash water is exhausted after the backwashing step, the backwashing method comprising the steps of:
The backwashing step may include a step of supplying a portion of the raw water introduced into the filtration unit 20 before the backwashing to the filtration unit 20 through the diaphragm 21 dividing the purified water storage unit and the filtration unit 20, And the other end is introduced into the siphon rising portion 31 of the siphon 30 including the siphon descending portion 32 formed to discharge the reverse water to the outside, The backwash water flows into the siphon descending part 32 and is filled with backwash water. When the backwash water is sensed through the water level sensor 50 mounted on the siphon descending part 32, the siphon descending part 32 And discharging the reverse water wash water to the outside by opening the reverse water wash water discharge valve (51)
Wherein the step of stopping the backwashing includes the step of supplying external air to the siphon through the backwash water control pipe when the predetermined backwash water is exhausted in communication with the purified water storage portion,
The backwash water flow rate is the flow rate between the water level sensor 50 and the backwash water discharge valve 51 that flows into at least the siphon descending part 32 to discharge the foreign substances accumulated in the filtration part 20 Wherein the natural backwash type backwash function is provided. delete delete delete

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