KR20210048149A - Water purifier - Google Patents

Abstract

A water purifier is disclosed. The water purifier according to an embodiment of the present invention includes: a filtering unit including a reverse osmosis filter; a flushing unit including a flushing tank in which water filtered by the reverse osmosis filter is stored and discharged as main flushing water; and a control unit for preforming control so that water can be filtered from the filtering unit to be supplied to a user, or so that the reverse osmosis filter can be flushed. The flushing unit can further include a flushing pump that allows the main flushing water to flow to the reverse osmosis filter and is connected to the control unit.

Description

Water purifier {WATER PURIFIER}

The present invention relates to a water purifier.

A water purifier is a device that filters water and supplies it to a user, and the water purifier includes a water filter to filter water.

Among these filters, there is a reverse osmosis filter equipped with a reverse osmosis membrane. Water introduced into the reverse osmosis filter at a predetermined pressure is filtered while passing through the reverse osmosis membrane of the reverse osmosis filter. In addition, water that has not passed through the reverse osmosis membrane is drained from the reverse osmosis filter as water for living purposes.

Therefore, in a reverse osmosis filter, water with a high TDS (Total Dissolved Solids) concentration, that is, unfiltered water, exists on one side of the reverse osmosis membrane, and water with a low TDS concentration, that is, filtered water, is present on the other side. It is done.

For example, the reverse osmosis filter is divided into a non-filtration side and a filtering side by a reverse osmosis membrane.

On the other hand, while water is not filtered through the reverse osmosis filter, water on the filtering side of the reverse osmosis filter is moved to the non-filtered side by the osmotic pressure. Accordingly, the TDS concentration of the water on the filtering side of the reverse osmosis filter is increased, so that the TDS concentration of the water on the non-filtered side is not equal to or different from that of the water.

In this state, when filtration of water is resumed through the reverse osmosis filter, water with a high TDS concentration present on the filtering side of the reverse osmosis filter is initially supplied to the user, and this phenomenon is called a creep phenomenon.

The present invention has been made by recognizing at least one of the demands or problems occurring in the prior art as described above.

An aspect of an object of the present invention is to prevent water with a high TDS concentration from being discharged at the beginning of the filtration when water is filtered using a reverse osmosis filter and not supplied to the user.

Another aspect of the object of the present invention is to make flushing of the reverse osmosis filter by main flushing water, which is water filtered by the reverse osmosis filter, more effectively and smoothly.

Another aspect of the object of the present invention is to flush the reverse osmosis filter with only the main flushing water or with the sub-flushing water and the main flushing water, which are water before being filtered by the reverse osmosis filter.

A water purifier related to an embodiment for realizing at least one of the above problems may include the following features.

A water purifier according to an embodiment of the present invention includes a filtering unit including a reverse osmosis filter; And a flushing tank in which the water filtered by the reverse osmosis filter is stored and discharged as main flushing water. A control unit configured to filter water in the filter unit and supply it to a user, or to flush the reverse osmosis filter; The flushing unit may further include a flushing pump that allows the main flushing water to flow to the reverse osmosis filter and is connected to the control unit.

In this case, the control unit may allow the reverse osmosis filter to be flushed with only the main flushing water, or the reverse osmosis filter to be flushed with sub-flushing water, which is water before being filtered by the reverse osmosis filter, and then flush with the main flushing water. have.

In addition, the reverse osmosis filter may be divided into a non-filtration side and a filtering side by a reverse osmosis membrane.

And, the non-filtered side may be flushed.

In addition, on the non-filtering side, an inlet line through which water flows into the reverse osmosis filter, and water that is not filtered because it does not pass through the reverse osmosis membrane, or the main flushing water or the sub-flushing water that flushes the non-filtered side. A line is connected, and a water outlet line through which water filtered through the reverse osmosis membrane is discharged may be connected to the filtering side.

In addition, the flushing tank may be connected to a tank inlet line connected to the outlet line, and a tank outlet line connected to the inlet line and provided with the flushing pump.

In addition, an inlet valve and an inlet pump respectively connected to the control unit are provided in a portion of the inlet line before the tank outlet line is connected, and a flushing/living water valve connected to the control unit is provided in the drain line, A water outlet valve connected to the control unit may be provided at a portion of the water outlet line next to a location to which the tank inlet line is connected.

In addition, the flushing/living water valve has a purified water state in which a predetermined filtration pressure is formed on the non-filtering side and the domestic water is drained through the drain line, and the main flushing is further opened than the purified water state to the drain line. It can be switched between flushing states allowing water or sub-flushing water to drain.

In addition, the tank inlet line is provided with a tank inlet valve connected to the control unit, the tank outlet line is provided with a tank outlet valve connected to the controller, and in the drain line, a drain side TDS sensor connected to the control unit is provided. It can be provided.

In addition, the control unit opens the inlet valve, drives the intake pump, switches the flushing-use water valve to the purified water state, and opens the outlet valve, so that water is introduced into the filter unit, filtered, and discharged to the outside. I can.

In addition, when the flushing tank is at a preset low water level, the control unit may open the tank intake valve so that the water filtered by the reverse osmosis filter is stored in the flushing tank as the main flushing water through the tank intake line.

In addition, the control unit may close the tank receiving valve when the flushing tank reaches a preset full water level.

In addition, when the water outlet valve is closed, the control unit may switch the flushing/living water valve to the flushing state so that the non-filtering side is flushed.

In addition, the water outlet line may be provided with a water outlet side TDS sensor connected to the control unit.

In addition, when the TDS (Total Dissolved Solids) concentration detected by the TDS sensor on the outlet side is lower than a preset value, the control unit causes the unfiltered side to be flushed only with the main flushing water, and the TDS sensor on the outlet side If the TDS concentration detected in is greater than or equal to a preset value, the unfiltered side may be flushed with the sub-flushing water and then flushed with the main flushing water.

And, when the TDS concentration sensed by the TDS sensor on the outlet side is lower than a preset value, the inlet valve is closed and the tank outlet valve is opened, and the main flushing water is driven by the flushing pump. It can be made to flow into the non-filtration side through a part of the intake line.

In addition, when the TDS concentration detected by the water outlet side TDS sensor is greater than or equal to a preset value, the control unit may open the inlet valve so that the sub-flushing water flows into the non-filtered side through the inlet line.

In addition, if the TDS concentration detected by the drainage side TDS sensor is greater than or equal to a preset value, the control unit may continuously flush the non-filtered side with the sub-flushing water until it becomes lower than a preset value.

In addition, when the TDS concentration detected by the drainage side TDS sensor is lower than a preset value, the inlet valve is closed and the tank outlet valve is opened, and the main flushing water is driven by the flushing pump to the tank outlet line and the tank outlet. It can be made to flow into the non-filtration side through a part of the intake line.

And, the control unit allows the non-filtered side to be flushed only with the main flushing channel when the ratio of the purified waste water, which is the ratio of the flow rate of water filtered by the reverse osmosis filter to the flow rate of the living water, is lower than a preset value. If the wastewater ratio is greater than or equal to a preset value, the unfiltered side may be flushed with the sub-flushing water and then flushed with the main flushing water.

In addition, when the purified wastewater ratio is lower than a preset value, the control unit closes the inlet valve and opens the tank outlet valve, and drives the flushing pump so that the main flushing water passes through the tank outlet line and a part of the inlet line. It can be made to flow into the non-filtration side.

In addition, when the constant waste water ratio is greater than or equal to a preset value, the control unit may open the inlet valve so that the sub-flushing water flows into the non-filtered side through the inlet line.

In addition, if the TDS concentration detected by the drainage side TDS sensor is greater than or equal to a preset value, the control unit may continue to flush the non-filtered side with the sub-flushing water until it becomes lower than a preset value.

And, when the TDS concentration detected by the drainage side TDS sensor is lower than a preset value, the inlet valve is closed and the tank outlet valve is opened, and the main flushing water is driven by the flushing pump to the tank outlet line and the tank outlet. It can be made to flow into the non-filtration side through a part of the intake line.

As described above, according to the exemplary embodiment of the present invention, when water is filtered using a reverse osmosis filter, water having a high TDS concentration is discharged at the beginning of the filtration so that it is not supplied to the user.

In addition, according to an embodiment of the present invention, the main flushing water, which is water filtered by the reverse osmosis filter stored in the flushing tank, flows to the reverse osmosis filter by the flushing pump, so that the reverse osmosis filter by the main flushing water can be flushed. It can be done more effectively and smoothly.

Another aspect of the object of the present invention is that the reverse osmosis filter can be flushed with only the main flushing water or with the sub-flushing water and the main flushing water, which are water before being filtered by the reverse osmosis filter.

1 is a view showing a first embodiment of a water purifier according to the present invention.
2 to 4 are views showing the operation of an embodiment of the water purifier according to the present invention.
5 is a view showing a second embodiment of a water purifier according to the present invention.
6 to 8 are views showing the operation of the second embodiment of the water purifier according to the present invention.

In order to help understand the features of the present invention as described above, a water purifier related to an embodiment of the present invention will be described in more detail below.

The embodiments described below will be described on the basis of embodiments most suitable for understanding the technical features of the present invention, and the technical features of the present invention are not limited by the described embodiments, but will be described below. It is to illustrate that the present invention can be implemented as in the embodiments. Accordingly, the present invention can be variously modified within the technical scope of the present invention through the embodiments described below, and such modified embodiments will fall within the technical scope of the present invention. And, in the reference numerals in the accompanying drawings in order to help understand the embodiments described below, related elements among the elements that perform the same function in each embodiment are indicated by numbers on the same or extension lines.

First embodiment of water purifier

Hereinafter, a first embodiment of a water purifier according to the present invention will be described with reference to FIGS. 1 to 4.

1 is a view showing a first embodiment of the water purifier according to the present invention, and Figures 2 to 4 are views showing the operation of an embodiment of the water purifier according to the present invention.

The first embodiment of the water purifier 100 according to the present invention may include a filtering unit 200, a flushing unit 300, and a control unit 400 as shown in FIG. 1.

The filtering unit 200 may filter water supplied from a water supply source (not shown) such as a tap water. To this end, the filtering unit 200 may include a reverse osmosis filter 210.

The reverse osmosis filter 210 may be divided into a non-filtration side 211 and a filtering side 212 by a reverse osmosis membrane MB as shown in FIG. 1. For example, the reverse osmosis filter 210 may be divided into a non-filtering side 211 and a filtering side 212 by being provided inside the reverse osmosis filter 210 in a rolled state. However, the configuration in which the reverse osmosis filter 210 is divided into the non-filtering side 211 and the filtering side 212 by the reverse osmosis membrane MB is not particularly limited, and any known configuration may be used.

As shown in FIG. 1, an inlet line LWI and a drain line LWD may be connected to the non-filtering side 211 of the reverse osmosis filter 210.

Through the inlet line (LWI), as shown in Figure 2, water to be filtered may be introduced into the non-filtered side 211 of the reverse osmosis filter 210. In this case, some of the water flowing into the non-filtering side 211 of the reverse osmosis filter 210 may be filtered while passing through the reverse osmosis membrane MB, and the rest may not pass through the reverse osmosis membrane MB and thus may not be filtered.

In addition, surf flushing water, which is water before being filtered by the reverse osmosis filter 210, may flow into the non-filtered side 211 of the reverse osmosis filter 210, as shown in FIG. 3 through the intake line LWI. In this way, the sub-flushing water introduced into the non-filtered side 211 of the reverse osmosis filter 210 may flush the non-filtered side 211.

And, through a part of the intake line (LWI), the main flushing water stored in the flushing tank 310, which will be described later, included in the flushing unit 300, as shown in Fig. 4, the non-reverse side of the reverse osmosis filter 210 ( 211). In this way, the main flushing water introduced into the non-filtered side 211 of the reverse osmosis filter 210 may flush the non-filtered side 211.

Through the drain line (LWD), as shown in Fig. 2, the water for household use, which is water that cannot be filtered because it does not pass through the reverse osmosis membrane MB, or the non-filtered side of the reverse osmosis filter 210 as shown in Figs. The sub-flushing water or main flushing water flushed with 211) can be drained to the outside.

Intake line (LWI) may be provided with an intake valve (V1) and intake pump (PI). For example, as shown in FIG. 1, the inlet valve VI and the inlet pump PI may be provided in a portion of the inlet line LWI before the tank outlet line LTO, which will be described later, is connected. The intake valve VI and the intake pump PI may be connected to the control unit 400, respectively. And, when the intake valve VI is opened by the control unit 400 and the intake pump PI is driven, the water from the water supply source flows into the filtering unit 200 through the intake line LWI as shown in FIG. And can be filtered. In addition, when the inlet valve VI is opened by the control unit 400, the sub-flushing water can flow into the non-filtered side 211 of the reverse osmosis filter 210 through the inlet line (LWI) as shown in FIG. have. In this way, the sub-flushing water introduced into the non-filtered side 211 of the reverse osmosis filter 210 may flush the non-filtered side 211. In this case, the control unit 400 may drive the intake pump PI.

The drain line LWD may be provided with a flushing and living water valve VFL. The flushing/living water valve (VFL) may be connected to the control unit 400. The control unit 400 may switch the flushing/living water valve (VFL) between a purified water state and a flushing state. In the purified water state, the flushing/living water valve VFL may allow the living water to be drained through the drain line LWD while a predetermined filtration pressure is formed on the non-filtering side 211 of the reverse osmosis filter 210. In addition, in the flushing state, the flushing-use water valve (VFL) may be more open than in the purified state. In addition, as shown in Figs. 3 and 4, the sub-flushing water or main flushing water flowing into the non-filtering side 211 of the reverse osmosis filter 210 flushes the non-filtering side 211 of the reverse osmosis filter 210. It may be drained through the drainage line LWD. In the flushing/living water valve (VFL), for example, holes of different sizes (not shown) are formed at a predetermined angle, and in the purified state, a relatively small hole is connected in parallel to the drainage line (LWD), and in the flushing state, a relatively small hole is connected in parallel to the drainage line (LWD). As a result, a large hole may be connected in parallel to the drain line LWD. However, the flushing/living water valve (VFL) is not particularly limited, and any known configuration is possible as long as it can be switched between the above-described purified water state and flushing state. As described above, instead of providing the flushing and living water valve VFL in the drain line LWD, another configuration having the same function may be used. For example, a water valve for daily use in which a hole of a predetermined diameter is formed in the drain line LWD so that a predetermined filtering pressure is formed on the non-filtering side 211 of the reverse osmosis filter 210 so that the domestic water is drained through the drain line LWD. (Not shown) may be provided. In addition, a flushing valve (not shown) capable of opening and closing may be provided in the flushing drain line (not shown) connected to the drain line LWD.

The drain line LWD may be provided with a drain side TDS sensor STD and a temperature sensor ST as shown in FIG. 1. The drainage side TDS sensor STD may detect the TDS (Total Dissolved Solids) concentration of water present in the drainage line LWD or flowing through the drainage line LWD. In addition, the temperature sensor ST may detect the temperature of water existing in the drain line LWD or flowing through the drain line LWD. Since the drainage side TDS sensor (STD) is sensitive to temperature, it is possible to calibrate the TDS concentration detected by the drainage side TDS sensor (STD) with the temperature of the water in the drainage line (LWD) detected by the temperature sensor (ST). . The drainage side TDS sensor STD and the temperature sensor ST may be connected to the control unit 400. In addition, the TDS concentration of the water in the drain line LWD and the temperature of the water in the drain line LWD detected by the drain side TDS sensor STD may be transmitted to the control unit 400.

A water outlet line LWO may be connected to the filtering side 212 of the reverse osmosis filter 210 as shown in FIG. 1. Through the water outlet line LWO, the filtered water may be discharged through the reverse osmosis membrane MB of the reverse osmosis filter 210 as shown in FIG. 2.

A water outlet valve VO may be provided in the water outlet line LWO. For example, as shown in FIG. 1, the water outlet valve VO may be provided in a portion of the water outlet line LWO next to the point where the tank inlet line LTI, which will be described later, is connected. The water outlet valve VO may be electrically connected to the control unit 400. And, when the water outlet valve (VO) is opened by the control unit 400, as shown in Figure 2, the water filtered by the filter unit 200 is connected to the water outlet line (LWO) and the water outlet line (LWO). It may be discharged to the outside through a water outlet member DW such as three and supplied to the user.

A water outlet valve opening/closing sensor SVO may be provided in the water outlet line LWO as shown in FIG. 1. The water outlet valve opening/closing detection sensor SVO may detect the opening and closing of the water outlet valve VO. For example, the water outlet valve opening/closing sensor SVO may be a pressure sensor. In this case, when the water outlet valve VO is opened, the pressure of the water outlet line LWO is lowered below the preset opening pressure, and when the water outlet valve VO is closed, the pressure of the water outlet line LW0 decreases. It is possible to detect the opening and closing of the water outlet valve VO by sensing that the pressure increases above a preset closing pressure. However, it is not particularly limited that the water outlet valve opening/closing sensor SVO detects the opening and closing of the water outlet valve VO, and it is well known that it detects the opening and closing of the water outlet valve VO by detecting the flow of water in the water outlet line LWO. Any configuration of is possible. The water outlet valve opening/closing sensor SVO may be connected to the control unit 400. In addition, whether or not the water outlet valve VO sensed by the water outlet valve opening/closing sensor SVO is opened or closed may be transmitted to the control unit 400.

The water outlet line LWO may be provided with a water outlet side TDS sensor STO and a temperature sensor ST as shown in FIG. 1. The water outlet side TDS sensor STO may detect the TDS concentration of water existing in the water outlet line LWO or flowing through the water outlet line LWO. In addition, the temperature sensor ST may detect the temperature of water existing in the water outlet line LWO or flowing through the water outlet line LWO. Since the water outlet side TDS sensor (STO) is sensitive to temperature, it is possible to calibrate the TDS concentration detected by the water outlet side TDS sensor (STO) with the temperature of the water in the water outlet line (LWO) detected by the temperature sensor (ST). . The water outlet side TDS sensor (STO) and the temperature sensor (ST) may be connected to the control unit 400. In addition, the TDS concentration of the water in the water outlet line LWO and the temperature of the water in the water outlet line LWO detected by the water outlet side TDS sensor STO may be transmitted to the controller 400.

Meanwhile, the filtration unit 200 further includes a pre-treatment filter 220 and a post-treatment filter 230 as shown in FIG. 1 in addition to the above-described reverse osmosis filter 210 for filtration of water supplied from a water supply source. can do.

However, in order to filter water supplied from the water supply source to the filtering unit 200, a water filter that is additionally included in addition to the reverse osmosis filter 210 is not particularly limited, and any known water filter may be included.

The pretreatment filter 220 may be connected to the intake line LWI as shown in FIG. 1. For example, the pretreatment filter 220 may be connected to a portion of the inlet line LWI before the inlet valve VI. However, the pretreatment filter 220 may be connected to a portion of the inlet line LWI between the inlet valve VI and the tank outlet line LTO.

The intake line (LWI) may be connected to a water supply source such as water supply. And, when the intake valve (V1) of the intake line (LWI) is opened by the control unit 400, the water from the water supply source is first passed through the intake line (LWI) as shown in Figs. And can be filtered. The water filtered by the pretreatment filter 220 in this way may flow into the non-filtered side 211 of the reverse osmosis filter 210 through the inlet line LWI. In this case, when the intake pump (PI) is driven by the control unit 400 and the flushing/living water valve (VFL) is converted to a purified water state, among the water flowing into the non-filtering side 211 of the reverse osmosis filter 210 Some may be filtered through a reverse osmosis membrane (MB) as shown in FIG. 2 to flow to a water outlet line (LOW). In addition, household water that has not been filtered because it has not passed through the reverse osmosis membrane MB may flow to the drain line LWD. When the intake valve (V1) of the intake line (LWI) is opened by the control unit 400, when the flushing and household water valve (VFL) is switched to the flushing state by the control unit 400, as shown in FIG. The sub-flushing water, which is water filtered by the pretreatment filter 220 and before being filtered by the reverse osmosis filter 210, flows into the non-filtered side 211 of the reverse osmosis filter 210, flushes the non-filtered side 211, and then drains. It can flow in the line LWD. In this way, when the non-filtering side 211 of the reverse osmosis filter 210 is flushed by the sub-flushing water, the intake pump PI may be driven by the control unit 400.

The post-processing filter 230 may be connected to the water outlet line LWO as shown in FIG. 1. For example, the post-treatment filter 230 may be connected to a portion of the water outlet line LWO between the tank inlet line LTI and the outlet valve VO. However, the post-treatment filter 230 may be connected to a portion of the water outlet line LWO after the water outlet valve VO.

The water outlet line LWO may be connected to a water outlet member DW such as a cock or a faucet, as shown in FIG. 1. In addition, when the water outlet valve VO of the water outlet line LWO is opened by the control unit 400, the water filtered by the reverse osmosis filter 210 as shown in FIG. 2 is filtered through the water outlet line LWO. It may be introduced into 230 and be filtered. In addition, the water filtered by the post-treatment filter 230 may flow through the water outlet line LWO and be discharged to the outside through a water outlet member DW such as a cock or a faucet to be supplied to the user.

The flushing unit 300 may include a flushing tank 310. In the flushing tank 310, water filtered by the reverse osmosis filter 210 may be stored as main flushing water as shown in FIG. 2. In this way, the main flushing water stored in the flushing tank 310 is discharged from the flushing tank 310, as shown in FIG. 4, and the reverse osmosis filter 210 of the filtering unit 200, for example, the reverse osmosis filter 210 It is possible to flush the non-filtered side 211 of. The flushing tank 310 may be connected to a tank inlet line LTI and a tank outlet line LTO as shown in FIG. 1.

The tank inlet line LTI may be connected to the outlet line LWO. For example, the tank inlet line LTI is a portion of the outlet line LWO between the filtering side 212 of the reverse osmosis filter 210 of the filtering unit 200 and the post-treatment filter 230 as shown in FIG. Can be connected to. A tank intake valve VTI may be provided in the tank intake line LTI. The tank receiving valve VTI may be connected to the control unit 400. When the tank inlet valve (VTI) is opened by the control unit 400, the water filtered by the reverse osmosis filter 210 of the filtration unit 200 is transferred to the main flushing water through the tank inlet line (LTI) as shown in FIG. The furnace may be introduced into the flushing tank 310 and stored.

The tank outlet line (LTO) may be connected to the inlet line (LWI). For example, the tank outlet line (LTO) of the inlet valve (VI) and the inlet line (LWI) between the non-filtration side 211 of the reverse osmosis filter 210 of the filtering unit 200, as shown in Figure 1 Can be connected to the part. A tank outlet valve VTO may be provided in the tank outlet line LTO. The tank discharge valve VTO may be connected to the control unit 400. When the tank discharge valve (VTO) is opened by the control unit 400, the reverse osmosis pressure filter of the filtering unit 200 through the main flushing water stored in the flushing tank 310 as shown in FIG. 210), for example, may be introduced into the non-filtered side 211 of the reverse osmosis filter 210 to flush the non-filtered side 211. A flushing pump 320 to be described later may be provided in the tank outlet line LTO.

The flushing tank 310 may be provided with a full water level sensor SLH and a low water level sensor SLL as shown in FIG. 1. The full water level sensor SLH may detect a preset full water level of the flushing tank 310, and the low water level sensor SLL may detect a preset low water level of the flushing tank 310. The full water level sensor SLH and the low water level sensor SLL may be connected to the control unit 400, respectively. Accordingly, the full water level sensor SLH sensing the full water level of the flushing tank 310 or the low water level sensor SLL sensing the low water level of the flushing tank 310 may be transmitted to the controller 400.

When the low water level sensor (SLL) detects the low water level of the flushing tank 310 is transmitted to the control unit 400, the control unit 400 opens the inlet valve VI as shown in FIG. It is driven and when the flushing water outlet valve (VO) is converted to a purified water state and the water outlet valve (VO) is opened so that water is filtered by the filtration unit 200 and discharged to the outside, the tank inlet valve (VTI) can be opened. . Accordingly, the water filtered by the reverse osmosis filter 210 may be introduced into the flushing tank 310 as the main flushing water and stored. In addition, after the flushing of the reverse osmosis filter 210 is finished, when the low water level sensor (SLL) detects the low water level of the flushing tank 310 is transmitted to the control unit 400, the control unit 400 does not open the water outlet valve (VO). Even if not, it is possible to open the inlet valve (VI), drive the inlet pump (PI), switch the flushing-use water valve (VFL) to a purified state, and open the tank inlet valve (VTI). Accordingly, the water filtered by the reverse osmosis filter 210 may be introduced into the flushing tank 310 as the main flushing water and stored.

As described above, when the main flushing water is introduced and stored in the flushing tank 310 and the flushing tank 310 is at a full water level, the full water level sensor SLH may detect this. In this way, when the detection of the full water level of the flushing tank 310 by the full water level sensor SLH is transmitted to the control unit 400, the control unit 400 may close the tank receiving valve VTI. When water is filtered by the filtration unit 200 and discharged to the outside, when the full water level of the flushing tank 310 is detected by the full water level sensor SLH, the control unit 400 can close only the tank intake valve VTI. have. However, when the water filtered by the filtration unit 200 is not discharged to the outside and is stored only in the flushing tank 310, when the full water level of the flushing tank 310 is sensed by the full water level sensor SLH, the controller 400 In addition to closing the tank inlet valve (VTI), the inlet valve (VI) must be closed and the intake pump (PI) must be stopped.

An air vent line LVA may be connected to the flushing tank 310 as shown in FIG. 1. Accordingly, as shown in FIG. 2, when the water filtered by the reverse osmosis filter 210 is stored in the flushing tank 310 as the main flushing water, the air inside the flushing tank 310 may be discharged to the outside. .

Meanwhile, the flushing unit 300 may further include a flushing pump 320. The flushing pump 320 may allow the main flushing water of the flushing tank 310 to flow to the reverse osmosis filter 210 of the filtering unit 200. In this way, when the main flushing water of the flushing tank 310 flows to the reverse osmosis filter 210 of the filtering unit 200 by the flushing pump 320, the flow rate of the main flushing water flowing to the reverse osmosis filter 210 It does not change according to this time, and can flow to the reverse osmosis filter 210 relatively uniformly. Accordingly, flushing of the reverse osmosis filter 210 by the main flushing water can be performed more effectively and smoothly.

The flushing pump 320 may be connected to the control unit 400. The flushing pump 320 may be provided in the tank outlet line LTO as shown in FIG. 1. When the flushing pump 320 is driven by the control unit 400 with the tank discharge valve (VTO) open as described above, as shown in FIG. 4, the main flushing water stored in the flushing tank 310 is the tank discharge line ( LTO) flows into the non-filtered side 211 of the reverse osmosis filter 210 of the filtering unit 200 to flush the non-filtered side 211.

As shown in FIG. 1 and described above, the control unit 400 may be connected to an inlet valve VI, an inlet pump PI, a flushing/use water valve VFL, and a water outlet valve VO. In addition, the control unit 400 may be connected to the tank inlet valve (VTI) and the tank outlet valve (VTO). In addition, the control unit 400 may be connected to the full water level sensor SLH and the low water level sensor SLL of the flushing tank 310. In addition, the control unit 400 may be connected to a water outlet valve opening/closing sensor (SVO), a drain side TDS sensor (STD), a water outlet side TDS sensor (STO), and a temperature sensor (ST).

As shown in FIG. 2, the control unit 400 may allow water to be filtered by the filter unit 200 and supplied to the user.

The control unit 400 may open the inlet valve VI, drive the inlet pump PI, convert the flushing and household water valve VFL into a purified state, and open the outlet water valve VO. As a result, as shown in FIG. 2, after the water of the water supply source is first filtered by the pretreatment filter 220 of the filtering unit 200 through the intake line (LWI), the reverse osmosis filter 210 of the filtering unit 200 ) May flow into the non-filtered side 211. Some of the water flowing into the non-filtering side 211 of the reverse osmosis filter 210 is filtered while passing through the reverse osmosis membrane (MB) of the reverse osmosis filter 210 and flows to the filtering side 212 to reach the water outlet line (LWO). Can be introduced. The water introduced into the water outlet line LWO may be filtered by the post-treatment filter 230 of the filtering unit 200 and then discharged to the outside through the water outlet member DWO to be supplied to the user. Among the water flowing into the non-filtering side 211 of the reverse osmosis filter 210, water that has not passed through the reverse osmosis membrane MB of the reverse osmosis filter 210 may be drained through the drain line LWD.

In this case, when the low water level sensor (SLL) of the flushing tank 310 of the flushing unit 300 detects the low water level of the flushing tank 310 is transmitted to the control unit 400, the control unit 400 is ) Can be opened. Accordingly, as shown in FIG. 2, water that is filtered by the reverse osmosis filter 210 of the filtering unit 200 and introduced into the water outlet line LWO through the filtering side 212 of the reverse osmosis filter 210 is discharged. The main flushing water may be stored in the flushing tank 310 through a part of the line LWO and the tank receiving line LTI. In addition, after the flushing of the reverse osmosis filter 210 is finished, when the low water level sensor (SLL) detects the low water level of the flushing tank 310 is transmitted to the control unit 400, the control unit 400 does not open the water outlet valve (VO). Even if not, it is possible to open the inlet valve (VI), drive the inlet pump (PI), switch the flushing-use water valve (VFL) to a purified state, and open the tank inlet valve (VTI). Accordingly, the water filtered by the reverse osmosis filter 210 may be introduced into the flushing tank 310 as the main flushing water and stored.

The control unit 400 may cause the reverse osmosis filter 210 to be flushed. In this case, the control unit 400 allows the reverse osmosis filter 210 to be flushed only with the main flushing water stored in the flushing tank 310, as shown in FIG. 4, or the filtering unit 200 as shown in FIG. The reverse osmosis filter 210 of may be flushed with sub-flushing water, which is water before being filtered by the reverse osmosis filter 210, and then flushed with the main flushing water as shown in FIG. 4. Accordingly, it is possible to more reliably prevent the occurrence of a creep phenomenon, which will be described later.

The control unit 400 may allow the non-filtered side 211 of the reverse osmosis filter 210 of the filtering unit 200 to be flushed. Accordingly, water having a low TDS concentration, for example, the same as or not different from the TDS concentration of the filtering side 212, exists in the non-filtering side 211 of the reverse osmosis filter 210. And, even while water is not filtered in the filtering unit 200 including the reverse osmosis filter 210, the water on the filtering side 212 of the reverse osmosis filter 210 is non-filtered side 211 by the osmotic pressure. May not go to. Accordingly, the TDS concentration of water present on the filtering side 212 of the reverse osmosis filter 210 may not increase. Therefore, when the filtration of water is resumed in the filter unit 200 including the reverse osmosis filter 210, water having a low TDS concentration is discharged even at the beginning of the filtration and can be supplied to the user. Accordingly, when water is filtered using the reverse osmosis filter 210, water having a high TDS concentration is discharged at the beginning of the filtration so that it is not supplied to the user. That is, a creep phenomenon may not occur.

The control unit 400 is in a state where the water outlet valve VO is closed, and the non-filtering side 211 of the reverse osmosis pressure filter 210 of the filtration unit 200 is flushed by switching the flushing-use water valve (VFL) to a flushing state. You can do it. For example, when it is transmitted to the control unit 400 that the water outlet valve VO is closed by the water outlet valve opening/closing detection sensor SVO, the control unit 400 opens the flushing/living water valve (VFL) in a flushing state that is more open than the purified water state. Can be switched to. Accordingly, the non-filtered side 211 of the reverse osmosis filter 210 may be flushed.

When the TDS concentration detected by the TDS sensor (STO) on the water outlet side is lower than a preset value, the non-filtering side 211 of the reverse osmosis filter 210 of the filtering unit 200 is the flushing unit 300 It can be flushed with only the main flushing water stored in the flushing tank 310 of. If the TDS concentration detected by the water outlet side TDS sensor (STO) is lower than the preset value, the non-filtered side 211 of the reverse osmosis filter 210 is creeped even with the main flushing water stored in the flushing tank 310. It can be flushed sufficiently so that this does not occur.

When the TDS concentration detected by the TDS sensor (STO) on the outlet side is lower than a preset value, the inlet valve (VI) is closed and the tank outlet valve (VTO) is opened, and the flushing pump (320) of the flushing unit (300) is ) Can be driven. Accordingly, as shown in Figure 4, the main flushing water of the flushing tank 310 is non-filtered by the reverse osmosis filter 210 of the filtering unit 200 through a portion of the tank outlet line (LTO) and intake line (LWI). It may flow into the side 211. In this way, the main flushing water introduced into the non-filtered side 211 of the reverse osmosis filter 210 may be drained through the drain line LWD after flushing the non-filtered side 211 of the reverse osmosis filter 210. have.

When the TDS concentration detected by the TDS sensor (STO) on the water outlet side is greater than or equal to a preset value, the non-filtered side 211 of the reverse osmosis filter 210 of the filtering unit 200 is flushed with sub-flushing water. After that, it may be flushed with the main flushing water stored in the flushing tank 310 of the flushing unit 300. If the TDS concentration detected by the water outlet side TDS sensor (STO) is more than a preset value, only the main flushing water stored in the flushing tank 310 causes a creep phenomenon on the non-filtered side 211 of the reverse osmosis filter 210. It cannot be flushed enough to prevent it from occurring. Therefore, in this case, before flushing the non-filtered side 211 of the reverse osmosis filter 210 with the main flushing water of the flushing tank 310, the non-filtered side 211 of the reverse osmosis filter 210 is sub-flushing water. By flushing with, it is possible to flush the non-filtered side 211 of the reverse osmosis filter 210 so that a creep phenomenon does not occur.

The control unit 400 may open the inlet valve VI when the TDS concentration sensed by the outlet-side TDS sensor STO is greater than or equal to a preset value. Accordingly, the sub-flushing water, which is water before being filtered by the reverse osmosis filter 210 of the filtering unit 200, may flow into the non-filtering side 211 of the reverse osmosis filter 210 through the intake line LWI. In this way, the sub-flushing water introduced into the non-filtered side 211 of the reverse osmosis filter 210 may be drained through the drain line LWD after flushing the non-filtered side 211 of the reverse osmosis filter 210. have. In this case, the control unit 400 may drive the intake pump PI.

If the TDS concentration detected by the drainage side TDS sensor (STD) is greater than or equal to a preset value, the unfiltered side 211 of the reverse osmosis filter 210 of the filtering unit 200 is flushed with a sub-flushing water, and then the flushing unit 300 A creep phenomenon may occur even if the non-filtered side 211 of the reverse osmosis filter 210 is flushed with the main flushing water of the flushing tank 310 of ). Therefore, if the TDS concentration detected by the drainage side TDS sensor (STD) is greater than or equal to a preset value, the control unit 400 controls the reverse osmosis pressure filter 210 of the filter unit 200 into the sub-flushing water until it becomes lower than the preset value. The non-filtered side 211 can be continuously flushed.

While flushing the non-filtered side 211 of the reverse osmosis filter 210 of the sub-flushing water filter unit 200 as described above, the TDS concentration detected by the drainage TDS sensor STD may be lower than a preset value. . When the TDS concentration detected by the drainage side TDS sensor (STD) is lower than the preset value, the non-filtering side 211 of the reverse osmosis pressure filter 210 is transferred to the main flushing water of the flushing tank 310 of the flushing unit 300. You can flush enough to avoid creeping. Therefore, when the TDS concentration detected by the drainage side TDS sensor (STD) is lower than a preset value, the control unit 400 closes the inlet valve VI and opens the tank discharge valve VTO to drive the flushing pump 320. I can. Accordingly, the main flushing water of the flushing tank 310 may flow into the unfiltered side 211 of the reverse osmosis filter 210 through a portion of the tank outlet line LTO and the inlet line LWI. In this way, the main flushing water introduced into the non-filtered side 211 of the reverse osmosis filter 210 may be drained through the drain line LWD after flushing the non-filtered side 211 of the reverse osmosis filter 210. have.

Second embodiment of water purifier

Hereinafter, a second embodiment of a water purifier according to the present invention will be described with reference to FIGS. 5 to 8.

5 is a view showing a second embodiment of the water purifier according to the present invention, and Figures 6 to 8 are views showing the operation of the second embodiment of the water purifier according to the present invention.

Here, the second embodiment of the water purifier according to the present invention is the first embodiment of the water purifier according to the present invention described with reference to FIGS. If the static wastewater ratio, which is the ratio of the flow rate of water filtered by the reverse osmosis filter 210 of 200, is lower than a preset value, the non-filtered side 211 of the reverse osmosis filter 210 is flushed only with the main flushing water, If the constant waste water ratio is greater than or equal to a preset value, there is a difference in that the non-filtered side 211 of the reverse osmosis filter 210 is flushed with the sub-flushing water and then flushed with the main flushing water.

Therefore, in the following description, different configurations will be mainly described, and the remaining configurations may be replaced with those described with reference to FIGS. 1 to 4.

In the second embodiment of the water purifier 100 according to the present invention, the control unit 400 is the water purifier according to the present invention described above so that water is filtered and supplied to the user by the filter unit 200 as shown in FIG. It is the same as the first embodiment of (100). Therefore, hereinafter, a description thereof will be omitted.

Even in the second implementation of the water purifier 100 according to the present invention, the control unit 400 includes the reverse osmosis filter 210 of the filtering unit 200 as shown in FIG. 8, the flushing tank 310 of the flushing unit 300 After being flushed with only the main flushing water stored in, or after the reverse osmosis filter 210 is flushed with sub-flushing water, which is water before being filtered by the reverse osmosis filter 210, as shown in FIG. It can be flushed with flushing water.

When the ratio of the purified waste water, which is the ratio of the flow rate of the water filtered by the reverse osmosis filter 210 of the filter unit 200 to the flow rate of domestic water, is lower than a preset value, the ratio of the reverse osmosis filter 210 The filtering side 211 may be flushed with only the main flushing water stored in the flushing tank 310 of the flushing unit 300. When the constant waste water ratio is lower than a preset value, the non-filtered side 211 of the reverse osmosis filter 210 can be sufficiently flushed so that no creep phenomenon occurs with only the main flushing water stored in the flushing tank 310. .

When the constant waste water ratio is lower than a preset value, the control unit 400 may close the inlet valve VI and open the tank outlet valve VTO to drive the flushing pump 320 of the flushing unit 300. Accordingly, as shown in Figure 8, the main flushing water of the flushing tank 310 is non-filtered by the reverse osmosis filter 210 of the filtering unit 200 through a portion of the tank outlet line (LTO) and the inlet line (LWI). It may flow into the side 211. In this way, the main flushing water introduced into the non-filtered side 211 of the reverse osmosis filter 210 may be drained through the drain line LWD after flushing the non-filtered side 211 of the reverse osmosis filter 210. have.

On the other hand, in order to obtain the above-described constant waste water ratio, in the second embodiment of the water purifier 100 according to the present invention, as shown in FIG. 1, an intake side flow sensor (SFI) may be provided in the intake line (LWI). . The intake side flow sensor (SFI) can detect the flow rate of water flowing into the intake line (LWI). The intake side flow sensor (SFI) may be connected to the control unit 400. Accordingly, the flow rate of water flowing into the intake line LWI detected by the intake side flow sensor SFI may be transmitted to the control unit 400. In addition, in the second embodiment of the water purifier 100 according to the present invention, a water discharge side flow sensor SFO may be provided in the water discharge line LWO. The water outlet flow sensor SFO may detect the flow rate of water filtered by the reverse osmosis filter 210 of the filtering unit 200. The water outlet flow sensor SFO may be connected to the control unit 400. Accordingly, the flow rate of water filtered by the reverse osmosis filter 210 detected by the water outlet flow sensor SFO may be transmitted to the control unit 400.

Subtracting the flow rate of water filtered from the reverse osmosis filter 210 of the filtering unit 200 detected by the outlet flow sensor (SFO) from the flow rate of water flowing into the inlet line (LWI) detected by the inlet flow sensor (SFI) , It is possible to know the flow rate of household water, which is water that was not filtered by the reverse osmosis filter 210. Through this, it is possible to know the ratio of purified wastewater, which is the ratio of the flow rate of water filtered by the reverse osmosis filter 210 to the flow rate of domestic water. In addition, instead of having an inlet-side flow sensor (SFI) in the inlet line (LWI), a drain-side flow sensor (not shown) is provided in the drain line (LWD), so that the outlet-side flow sensor (SFO) and the drain-side flow sensor You can also know the ratio of wastewater through. In addition, instead of having a water outlet-side flow sensor (SFO) in the water outlet line (LWO), a drain-side flow sensor is provided in the drain line (LWD), and the constant wastewater ratio is provided through the inlet-side flow sensor (SFI) and the drain-side flow sensor. You can also know.

If the constant waste water ratio is greater than or equal to a preset value, the non-filtering side 211 of the reverse osmosis filter 210 of the filtering unit 200 is flushed with sub-flushing water, and then the flushing unit 300 is flushed. It can be flushed with the main flushing water stored in the tank 310. If the constant waste water ratio is more than a preset value, only the main flushing water stored in the flushing tank 310 cannot sufficiently flush the non-filtered side 211 of the reverse osmosis filter 210 so that a creep phenomenon does not occur. Therefore, in this case, before flushing the non-filtered side 211 of the reverse osmosis filter 210 with the main flushing water of the flushing tank 310, the non-filtered side 211 of the reverse osmosis filter 210 is sub-flushing water. By flushing with, it is possible to flush the non-filtered side 211 of the reverse osmosis filter 210 so that a creep phenomenon does not occur.

The control unit 400 may open the inlet valve VI when the constant waste water ratio is equal to or greater than a preset value. Accordingly, the sub-flushing water, which is water before being filtered by the reverse osmosis filter 210 of the filtering unit 200, may flow into the non-filtering side 211 of the reverse osmosis filter 210 through the intake line LWI. In this way, the sub-flushing water introduced into the non-filtered side 211 of the reverse osmosis filter 210 may be drained through the drain line LWD after flushing the non-filtered side 211 of the reverse osmosis filter 210. have. In this case, the control unit 400 may drive the intake pump PI.

If the TDS concentration detected by the drainage side TDS sensor (STD) is greater than or equal to a preset value, the unfiltered side 211 of the reverse osmosis filter 210 of the filtering unit 200 is flushed with a sub-flushing water, and then the flushing unit 300 Even if the non-filtered side 211 of the reverse osmosis filter 210 of the filtering unit 200 is flushed with the main flushing water of the flushing tank 310 of ), a creep phenomenon may occur. Therefore, if the TDS concentration detected by the drainage side TDS sensor (STD) is greater than or equal to a preset value, the control unit 400 controls the reverse osmosis pressure filter 210 of the filter unit 200 into the sub-flushing water until it becomes lower than the preset value. The non-filtered side 211 can be continuously flushed.

While flushing the non-filtered side 211 of the reverse osmosis filter 210 of the sub-flushing water filter unit 200 as described above, the TDS concentration detected by the drainage TDS sensor STD may be lower than a preset value. . When the TDS concentration detected by the drainage side TDS sensor (STD) is lower than a preset value, the non-filtering side 211 of the reverse osmosis filter 210 is transferred to the main flushing water of the flushing tank 310 of the flushing unit 300. You can flush enough to avoid creeping. Therefore, when the TDS concentration detected by the drainage side TDS sensor (STD) is lower than a preset value, the control unit 400 closes the inlet valve VI and opens the tank discharge valve VTO to drive the flushing pump 320. I can. Accordingly, the main flushing water of the flushing tank 310 may flow into the unfiltered side 211 of the reverse osmosis filter 210 through a portion of the tank outlet line LTO and the inlet line LWI. In this way, the main flushing water introduced into the non-filtered side 211 of the reverse osmosis filter 210 may be drained through the drain line LWD after flushing the non-filtered side 211 of the reverse osmosis filter 210. have.

As described above, when the water purifier according to the present invention is used, when water is filtered using a reverse osmosis filter, water with a high TDS concentration can be discharged at the beginning of the filtration so that it is not supplied to the user, and reverse osmosis pressure stored in the flushing tank By allowing the main flushing water, which is the water filtered by the filter, to flow to the reverse osmosis filter by the flushing pump, flushing of the reverse osmosis filter by the main flushing water can be made more effectively and smoothly, and the main flushing water alone or the reverse osmosis filter The reverse osmosis filter can be flushed with the sub-flushing water and the main flushing water, which are water before being filtered in.

The water purifier described above is not limitedly applicable to the configuration of the above-described embodiments, but the embodiments may be configured by selectively combining all or part of each of the embodiments so that various modifications can be made.

100: water purifier 200: filter unit
210: reverse osmosis filter 211: non-filtration side
212: filter side 220: pretreatment filter
230: post-treatment filter 300: flushing part
310: flushing tank 320: flushing pump
400: control unit VI: inlet valve
VO: Water outlet valve VFL: Household water valve for both flushing
VTI: Tank inlet valve VTO: Tank outlet valve
PI: Intake pump LWI: Intake line
LWO: Water outlet line LWD: Drain line
LTI: Tank inlet line LTO: Tank outlet line
LVA: Air vent line MB: Reverse osmosis membrane
SVO: Water outlet valve open/close detection sensor STD: Drain side TDS sensor
STO: TDS sensor on the outlet side SFI: Flow sensor on the inlet side
SFO: flow sensor on the outlet side ST: temperature sensor
SLH: Full water level sensor SLL: Low water level sensor
DW: Water outlet member

Claims (24)

A filtering unit including a reverse osmosis filter; And
A flushing unit including a flushing tank in which the water filtered by the reverse osmosis filter is stored and discharged as main flushing water;
A control unit for filtering water in the filtering unit and supplying it to a user, or for flushing the reverse osmosis filter; Including,
The flushing unit further comprises a flushing pump that allows the main flushing water to flow to the reverse osmosis filter and is connected to the control unit. The method of claim 1, wherein the control unit causes the reverse osmosis filter to be flushed only with the main flushing water, or the reverse osmosis filter is flushed with sub-flushing water, which is water before being filtered by the reverse osmosis filter, and then flushes with the main flushing water. Water purifier to be able to. The water purifier according to claim 2, wherein the reverse osmosis filter is divided into a non-filtration side and a filtering side by a reverse osmosis membrane. The water purifier according to claim 3, wherein the non-filtering side is flushed. The method of claim 4, wherein the non-filtering side includes an inlet line for allowing water to flow into the reverse osmosis filter, and the main flushing water or the sub flushing of the non-filtered side or household water which is water that was not filtered because it did not pass through the reverse osmosis membrane. A water purifier is connected to a drain line through which water is drained, and a water outlet line through which water filtered through the reverse osmosis membrane is discharged is connected to the filtering side. The water purifier according to claim 5, wherein the flushing tank is connected to a tank inlet line connected to the outlet line and a tank outlet line connected to the inlet line and provided with the flushing pump. The water supply valve of claim 6, wherein an inlet valve and an inlet pump respectively connected to the control unit are provided at a portion of the inlet line before the tank outlet line is connected, and the flushing and household water valve connected to the control unit in the drain line. Is provided, and a water outlet valve connected to the control unit is provided at a portion of the water outlet line next to a location to which the tank inlet line is connected. According to claim 7, wherein the flushing and household water valve is a purified water state in which a predetermined filtration pressure is formed on the non-filtering side and the household water is drained to the drain line, and the drain line is further opened than the purified water state. A water purifier that switches between flushing states in which the main flushing water or the sub flushing water is drained. According to claim 8, The tank inlet line is provided with a tank inlet valve connected to the control unit, the tank outlet line is provided with a tank outlet valve connected to the controller, and the drain line is drainage connected to the controller Water purifier equipped with side TDS sensor. The method of claim 9, wherein the control unit opens the inlet valve, drives the inlet pump, converts the flushing and household water valve to the purified water state, and opens the outlet valve, so that water is introduced into the filter unit and filtered to be external. Water purifier to be discharged into the water. The method of claim 9, wherein the control unit opens the tank inlet valve so that the water filtered by the reverse osmosis filter is stored in the flushing tank as the main flushing water through the tank inlet line when the flushing tank is at a preset low water level. Water purifier. The water purifier according to claim 11, wherein the control unit closes the tank inlet valve when the flushing tank reaches a preset full water level. The water purifier according to claim 9, wherein the control unit switches the flushing/living water valve to the flushing state while the water outlet valve is closed so that the non-filtering side is flushed. The water purifier according to claim 13, wherein a water outlet side TDS sensor connected to the control unit is provided in the water outlet line. The method of claim 14, wherein the control unit causes the unfiltered side to be flushed only with the main flushing water when the concentration of TDS (Total Dissolved Solids) detected by the TDS sensor on the outlet side is lower than a preset value, and the A water purifier configured to flush with the main flushing water after the unfiltered side is flushed with the sub-flushing water when the TDS concentration detected by the TDS sensor at the outlet side is greater than or equal to a preset value. The method of claim 15, wherein the control unit closes the inlet valve and opens the tank outlet valve, when the TDS concentration detected by the outlet side TDS sensor is lower than a preset value, and drives the flushing pump to drive the main flushing water to the tank. A water purifier that flows into the non-filtering side through a water outlet line and a part of the inlet line. The water purifier of claim 15, wherein the control unit opens the inlet valve to allow the sub-flushing water to flow into the non-filtration side through the inlet line when the TDS concentration detected by the outlet side TDS sensor is greater than or equal to a preset value. The water purifier of claim 17, wherein the control unit continuously flushes the non-filtered side with the sub-flushing water until the concentration of TDS detected by the drainage side TDS sensor is lower than a preset value. The method of claim 17, wherein when the TDS concentration detected by the drainage TDS sensor is lower than a preset value, the inlet valve is closed and the tank outlet valve is opened, and the main flushing water is driven by the flushing pump. A water purifier that flows into the non-filtering side through a water outlet line and a part of the inlet line. The method of claim 13, wherein the control unit is configured such that when the ratio of purified wastewater, which is a ratio of the flow rate of water filtered by the reverse osmosis filter to the flow rate of the domestic water, is lower than a preset value, the non-filtered side is flushed only with the main flushing water And, if the constant waste water ratio is greater than or equal to a preset value, the unfiltered side is flushed with the sub-flushing water and then flushed with the main flushing water. The method of claim 20, wherein when the constant waste water ratio is lower than a preset value, the control unit closes the inlet valve and opens the tank outlet valve, and drives the flushing pump to drive the main flushing water to the tank outlet line and the inlet line. A water purifier that flows into the non-filtered side through a part of. The water purifier according to claim 20, wherein the control unit opens the inlet valve to allow the sub-flushing water to flow into the non-filtration side through the inlet line when the constant wastewater ratio is greater than or equal to a preset value. The water purifier of claim 22, wherein the control unit continuously flushes the non-filtered side with the sub-flushing water until the concentration of TDS detected by the drainage side TDS sensor is lower than a preset value. The method of claim 23, wherein the control unit closes the inlet valve and opens the tank outlet valve when the TDS concentration detected by the drainage side TDS sensor is lower than a preset value, and drives the flushing pump to drive the main flushing water to the tank. A water purifier that flows into the non-filtering side through a water outlet line and a part of the inlet line.

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