WO2020110853A1

WO2020110853A1 - Water purification device and household water purifier

Info

Publication number: WO2020110853A1
Application number: PCT/JP2019/045388
Authority: WO
Inventors: 宗郷熊谷; 哲也門馬
Original assignee: シャープ株式会社
Priority date: 2018-11-27
Filing date: 2019-11-20
Publication date: 2020-06-04
Also published as: JP7346447B2; JPWO2020110853A1; CN113039007A

Abstract

The purpose of the present invention is to realize a water purification device capable of reducing consumption of an adsorption removal member and suppressing deterioration in the function. Provided is a water purification device (1) that purifies water by using an RO membrane (18) and a DI filter (19). In a water passage from the RO membrane (18) to the DI filter (19), an opening/closing mechanism (32) for blocking a water flow in the water passage is provided.

Description

Water purifier and household water purifier

The present invention relates to a water purifier and a household water purifier.

Recently, a water purification device using a reverse osmosis membrane (RO membrane) has been proposed.

Since it is very difficult to completely separate water molecules and impurities by the RO membrane, when further purification is required, for example, in Patent Document 1, a plurality of purification mechanisms using the RO membrane are provided and purification is performed. A technique for increasing the purity by repeating is disclosed.

ㆍIn recent years, a method using an ion exchange resin has been adopted as a new means for increasing the purity of purified water. Specifically, a filter (hereinafter referred to as a DI filter) in which a case for water flow is filled with an ion exchange resin is arranged in the latter stage of the RO membrane, and the purified water that has passed through the RO membrane is passed through the DI filter to leave impurities. High purification performance is obtained by further removing (for example, Patent Document 2).

Japanese Patent Laid-Open Publication "JP 2006-263542 A" Japanese Patent Publication “JP 2013-107031”

By the way, the above-mentioned purified water using the DI filter has an advantage that its structure is simple as compared with the method of repeating purification using an RO membrane, but the purification function of the DI filter is limited, and a certain amount of water is used. There is a problem in that the function is lost when the impurities in are removed. Therefore, in the purification of water using the DI filter, it is required to maintain its function for a longer period of time, and it is necessary to devise a means for suppressing the consumption of its performance. This can be said not only for the DI filter but also for an adsorption/removal member that generally adsorbs and removes impurities having a limited purification function.

An aspect of the present invention is to realize a water purification apparatus that can reduce the consumption of the adsorption removal member and suppress the deterioration of the function when the RO membrane and the adsorption removal member that adsorbs and removes impurities are used together. To do.

In order to solve the above problems, a water purification device according to an aspect of the present invention is a water purification device that purifies water using a reverse osmosis membrane and an adsorption removal member that adsorbs and removes impurities, The adsorption/removal member is arranged on a path from the osmosis membrane to the intake of purified water purified by the reverse osmosis membrane, and the water passage is provided on a water passage from the reverse osmosis membrane to the adsorption/removal member. It is characterized in that a first blocking mechanism for blocking the passage of water in the route is provided.

According to one aspect of the present invention, it is possible to realize a water purifier that can reduce the consumption of the adsorption/removal member and can suppress the deterioration of the function.

It is a schematic diagram which shows the schematic structure of the water purifier which concerns on Embodiment 1 of this invention. It is a schematic diagram which shows the schematic structure of the water purifier which concerns on Embodiment 2 of this invention. It is a schematic diagram which shows the modification of the water purifier shown in FIG. It is a schematic diagram which shows the schematic structure of the water purifier which concerns on Embodiment 3 of this invention. It is a schematic diagram which shows the modification of the water purifier shown in FIG. It is a schematic diagram which shows the schematic structure of the water purifier which concerns on Embodiment 4 of this invention. It is a schematic diagram which shows the modification of the water purifier shown in FIG. It is a schematic diagram which shows the other modification of the water purifier shown in FIG.

[Embodiment 1]
Hereinafter, one embodiment of the present invention will be described in detail.

(Structure of water purification device)
As shown in FIG. 1, the water purifier 1 is a household water purifier that uses a reverse osmosis membrane (RO membrane) and a filter (DI filter) filled with an ion exchange resin. The water purification device 1 includes a main path 50 that takes in raw water from an intake port 50a on one end side and discharges purified water from an intake port 50b on the other end side. When the water purifier 1 is a household water purifier, the intake port 50a is connected to tap water (raw water), and the extraction port 50b is connected to an outlet opening/closing mechanism such as a faucet. A first drainage path (discarding path) 51 described later is connected to, for example, a drainage pipe under a sink.

A pressure switch 10, a solenoid valve 31, a pressure reducing valve 11, a PP (polypropylene) filter 12, a front TDS 13, a water temperature meter 14, a front flow meter 15, an AC (activated carbon) filter 16, a Pump 17, in order from the most upstream side of the main path 50. An RO membrane (reverse osmosis membrane) 18, an opening/closing mechanism (first blocking mechanism) 32, a DI filter (impurity adsorption/removal member) 19, a rear flow meter 20, and a rear TDS 21 are arranged.

The pressure switch 10 is a switch that turns on at a certain pressure or higher, and turns on when raw water is supplied to the main path 50 and the pressure of the raw water (tap water pressure) can be detected. The pressure reducing valve 11 keeps the water pressure of the tap water flowing through the main path 50 constant.

The PP (polypropylene) filter 12 is a relatively coarse non-woven fabric made of polypropylene (PP) and removes relatively large impurities such as rust contained in raw water. The material is not limited and may be polyethylene (PE). By removing the relatively large impurities before reaching them, it is possible to suppress the deterioration of the reverse osmosis membrane (hereinafter, RO membrane) described later.

The front-side TDS 13 and the rear-side TDS 21 are water quality sensors that measure indicators of water quality, and measure the electrical conductivity of water to detect the concentration of impurities in the water. The front TDS 13 measures the water quality of the raw water taken in through the intake port 50a, and the rear TDS 21 measures the water quality of the purified water taken out through the intake port 50b. These measurement results are transmitted to a control unit (not shown), and the control unit calculates the purification rate from the measured values of the front TDS 13 and the rear TDS 21.

The water temperature gauge 14 is used for calibration of the front TDS 13 and the rear TDS 21. This is because the electric conductivity measured by the front TDS 13 and the rear TDS 21 has temperature dependence. The detection result is output to the control unit.

The AC filter 16 removes free substances such as free chlorine compounds contained in raw water with activated carbon. The RO film 18 is deteriorated by the free chlorine compound (so-called chlorine) contained in the tap water that is the raw water. Therefore, by removing the free chlorine compound with the AC filter 16 before reaching, the deterioration of the RO film 18 can be suppressed.

The Pump 17 is for sending water to the RO membrane 18 in the subsequent stage while applying a predetermined pressure, and is used to realize a cross flow method using the RO membrane 18 described later.

The front flow meter 15 and the rear flow meter 20 are sensors that measure the flow rate of water flowing through the main path 50. The measurement result is output to the control unit, and the control unit calculates the raw water intake amount (use amount), which is the measurement value of the front flow meter 15, and the purified water generation amount, which is the measurement value of the rear flow meter 20, Calculate the recovery rate.

The front flow meter 15 is preferably arranged between the PP filter 12 and the AC filter 16 as the arrangement position of the front flow meter 15, as shown in FIG. This is because by arranging the PP filter 12 at the subsequent stage (downstream side), it is possible to prevent the adhesion of dirt to the front flow meter 15.

The pressure reducing valve 11, the PP filter 12, the front TDS 13, the water temperature meter 14, the AC filter 16, the rear flow meter 20, and the rear TDS 21 described above may be provided as necessary.

RO membrane 18 separates water molecules and impurities. Here, the purification target water is caused to flow on the surface of the RO membrane 18 while applying water pressure by the Pump 17, thereby separating the treated water that has permeated the RO membrane 18 and the wastewater that has not permeated. The RO membrane 18 is separated into treated water (purified water) and waste water (concentrated water) by a so-called cross flow method.

The treated water flows through the main path 50 and flows into the DI filter 19 in the latter stage of the RO membrane 18, and the waste water is discharged from the waste port of the first drain path 51. As described above, the waste port is connected to, for example, the drain pipe under the sink.

A flash solenoid valve 22 is provided in the first drainage path 51. The flash solenoid valve 22 is a flow rate limiting valve that limits the flow rate of the wastewater flowing through the first drainage path 51. For example, the flush solenoid valve 22 limits the flow rate in the closed state (power-off state (non-energized)) and opens the flow path as much as possible in the open state (power-on state (energized)) to allow water to flow. It functions to flush.

(Purification by RO film 18)
The RO film 18 removes almost all impurities dissolved in water, both harmful and harmless, to obtain pure water of high purity. The RO film 18 is made of a network-like polymer film formed by cross-linking, and basically only water molecules permeate the polymer film due to the size of the network, so that the RO film 18 may not be mixed with impurities. The separation is performed and the above-mentioned purification performance can be obtained.

In the cross-flow method, water to be purified is passed over the surface of the RO membrane 18 while applying a constant water pressure, and at this time, the water that has passed through the RO membrane 18 due to water pressure is taken out as purified water and passed through the RO membrane 18. The remaining water is discarded as waste water. Therefore, in the cross-flow method, impurities are separated from water molecules by constantly passing the surface of the RO film 18. In the process of flowing water on the surface of the RO film 18, only water molecules permeate through the RO film 18 to be lost in the water on the drainage side. Then, the impurities are relatively concentrated and the concentration is increased, and the product is discarded. As described above, the purified water using the RO membrane 18 is accompanied by a certain amount of waste water (concentrated water).

Here, in order to pass water on the surface of the RO membrane 18 while applying water pressure, it was arranged on the Pump 17 (electric pump) arranged in the front stage of the RO membrane 18 and in the first drainage path 51 which is the rear stage of the RO membrane 18. A flash solenoid valve 22 is used as a flow rate limiting mechanism. By limiting the flow rate in the latter stage of the RO film 18 with respect to the amount of water pumped by the Pump 17, the inside of the path from the Pump 17 through the surface of the RO film 18 to the flash solenoid valve 22 is boosted by the power of the Pump 17. .. As the pressure increases, the amount of purified water that permeates the RO membrane 18 also increases. Therefore, in consideration of these balances, the pump 17 is pumped so as to obtain the desired pressure and purified water. Determine performance and flow restriction.

As described above, the flush solenoid valve 22 has a function of limiting the flow rate in the closed state as described above and opening the flow path as much as possible to allow water to flow in the open state. As a result, in addition to the function of applying pressure on the surface of the RO membrane 18 to generate purified water, a large amount of water is passed as necessary to wash away the surface of the RO membrane 18 electrically.

Further, as described above, since the RO film 18 has a fine structure, it is common to perform pretreatment of water to be purified for the purpose of maintaining this performance. For example, a filter (referred to as a sediment filter or the like: PP filter 12) mainly made of fibers such as PP (polypropylene) and PE (polyethylene) is used to remove deposits, fine particles, sticky substances, etc., and activated carbon as the main material. This is the adsorption and removal of chlorine, organic substances and the like used in the sterilization treatment of water supply by the filter (AC filter 16).

(Purification with DI filter 19)
The DI filter 19 is a filter in which a case for water flow is filled with an ion exchange resin. As the ion exchange resin, it is preferable to use a resin having a function of removing both cations and anions that are components of impurities for purification of water. That is, in the DI filter 19, cations are exchanged for hydrogen ions and anions are exchanged for hydroxide ions, and the released hydrogen ions and hydroxide ions are neutralized in water to return to water. Is purified. Therefore, the DI filter 19 can be said to be an impurity adsorption/removal member that adsorbs and removes the impurities contained in the water purified by the RO film 18.

(Function and effect of opening/closing mechanism 32)
The opening/closing mechanism 32 is provided along the path (main path 50) that connects the RO film 18 and the DI filter 19, and is a mechanism that blocks the diffusion of impurities dissolved in water. In this case, the opening/closing mechanism 32 opens the main path 50 during the cleaning operation to allow water to pass therethrough, and shuts off the main path 50 when the cleaning operation is stopped to cut off water coming and going across the opening/closing mechanism 32.

As a result, the total amount of impurities removed by the DI filter 19 is suppressed while the purification operation is stopped, and unnecessary purification performance is prevented from being consumed, so that the purification function of the DI filter 19 is used for a longer period of time. You can

Normally, when the water purification operation is continuously performed, the purified water and the wastewater in which the impurities are concentrated are separated with the RO membrane 18 interposed therebetween, and the DI filter 19 contains few impurities. Only purified water from the RO membrane 18 is supplied. However, when the purifying operation is stopped and the water in the water purifier 1 is no longer supplied, the impurities contained in the water left in the front-stage region that permeates the RO membrane 18 are transferred to the purified water side that has passed through the RO membrane 18. A phenomenon occurs in which a certain water permeates the RO film 18 and diffuses with time. Therefore, if the path blocking mechanism (opening/closing mechanism 32) as described above is not provided, the impurities thus permeated through the RO film 18 gradually diffuse to the DI filter 19, and the ions in the DI filter 19 are diffused. Purified by exchange resin. Since this phenomenon continues until the concentration of impurities in the water sandwiching the RO film 18 becomes equal, finally the impurities of water staying in all regions on the front side of the RO film 18 are absorbed by the DI filter 19. It will be continued until it is purified. Therefore, the impurities that should originally be discarded as concentrated water by the RO membrane 18 are also purified by the DI filter 19, and the purification performance of the DI filter 19 is greatly consumed and wasted. Therefore, as described above, by providing the opening/closing mechanism 32 for blocking the diffusion of impurities dissolved in water on the path connecting the RO film 18 and the DI filter 19, the above-mentioned substance diffusion can be achieved. It is possible to prevent the accompanying impurities from reaching the DI filter 19.

As described above, in order to narrow the diffusion range of the substance diffusion of the impurities sandwiching the RO film 18 as much as possible to reduce the amount of impurities to be purified by the DI filter 19 when the purification operation is restarted, the opening/closing mechanism 32 is as close as possible to the RO film. It is desirable to install it near 18.

(effect)
According to the above configuration, when the cleaning operation is stopped, the diffusion of impurities that have exuded from the RO film 18 can be suppressed by the opening/closing mechanism 32. As a result, the amount of impurities that reach the DI filter 19 is small, and unnecessary impurities need not be removed when the purification operation is stopped. Therefore, deterioration of the DI filter 19 can be suppressed, that is, the life of the DI filter 19 can be extended. That is, according to the water purifier 1, in the purification mechanism that performs purification by the DI filter 19 after purification by the RO membrane 18, consumption of unnecessary purification performance of the DI filter 19 is prevented, and the functional life is maintained long. can do.

Also, if the opening/closing mechanism 32 is installed as close to the RO membrane 18 as possible (immediately after the RO membrane 18), diffusion of concentrated water drifting near the RO membrane 18 when the purification operation is stopped is prevented from reaching the DI filter 19 as much as possible. be able to. As a result, the functional life of the DI filter 19 can be extended.

In the present embodiment, the opening/closing mechanism 32 provided on the way of connecting the RO membrane 18 and the DI filter 19 is one that opens and closes without power (for example, a manual opening/closing mechanism (valve), a check valve). Alternatively, it may be one that opens and closes with electric power (for example, a solenoid valve).

[Embodiment 2]
Another embodiment of the present invention will be described below. For convenience of description, members having the same functions as the members described in the above embodiment are designated by the same reference numerals, and the description thereof will not be repeated.

(Structure of water purification device)
As shown in FIG. 2, the water purifier 1A according to the present embodiment is different from the water purifier 1 of the first embodiment in that a forward direction (here, instead of the opening/closing mechanism 32 between the RO membrane 18 and the DI filter 19) is used. In this case, the check valve 33 that allows water to pass only to the outlet 50b side is used. The water purifier 1A has the same configuration as the water purifier 1 of the first embodiment except that a check valve 33 is used instead of the opening/closing mechanism 32.

(effect)
When the check valve 33 is used as the opening/closing mechanism 32, the valve is opened by water pressure in the forward direction to allow water to pass during the period during which the purification operation is performed. However, since the water pressure is lost and the valve closes while the operation is stopped, it is possible to block the diffusion of impurities with the water pressure in between, and the operation of the opening/closing mechanism can be automatically linked with the purification operation. Is born.

Moreover, since the check valve 33 operates without power, it operates even during a power failure. Moreover, since it is not expensive like a solenoid valve, the water purifier 1A can be manufactured at low cost.

[Modification]
As shown in FIG. 3, the water purification apparatus 1B according to the present modification flushes the electromagnetic valve (second shutoff mechanism) 31 arranged between the pressure switch 10 and the pressure reducing valve 11 in the water purification apparatus 1A shown in FIG. An example is shown in which the solenoid valve 22 is arranged on the downstream side. In the water purifier 1B, the outlet 50b of the main path 50 is provided with a faucet as a kind of opening/closing mechanism for opening and closing the outlet 50b. In this case, the power of the water purifier 1 is turned on by the operation of opening the faucet, and the power of the water purifier 1 is turned off by the operation of closing the faucet.

Therefore, it is possible to stop the purification operation by closing the faucet. Thereby, when the purification operation is stopped, the electromagnetic valve 31 can be turned off and the first drainage path 51 can be closed, so that the concentrated water flowing from the flush electromagnetic valve 22 is not discarded. Moreover, since the faucet provided at the outlet 50b of the main path 50 is closed when the cleaning operation is stopped, the pressure near the RO membrane 18 is maintained by the check valve 33 and the solenoid valve 31 in the off state. become. As a result, when the purification operation is restarted, it becomes possible to take out purified water without a time lag. That is, in addition to the check valve 33, the outlet 50b is provided with a faucet which is a kind of an outlet opening/closing mechanism, and the opening/closing of the faucet is linked to the cleaning operation. As a result, in addition to the effect that the purified water can be taken out without a time lag when the purification operation is restarted, there is an effect that the discharge of the purified water can be immediately stopped when the purification operation is stopped.

The solenoid valve 31 may be arranged between the RO membrane 18 and the flash solenoid valve 22. Also in this case, the same effect as when the solenoid valve 31 is arranged on the downstream side of the flash solenoid valve 22 can be obtained.

Note that the check valve 33 of the water purifying apparatus 1A shown in FIG. 2 may be an electromagnetic valve as an opening/closing mechanism linked with the purification operation. For example, as shown in the water purifier 1C shown in FIG. 4, an electromagnetic valve 34 may be provided between the RO membrane 18 and the DI filter 19.

Similarly, the check valve 33 of the water purifier 1B shown in FIG. 3 may be replaced with a solenoid valve 34 as shown in the water purifier 1D shown in FIG.

The solenoid valve 34 is turned on during the cleaning operation, opens the main path 50 to allow water to flow from the RO membrane 18 to the DI filter 19, is turned off when the cleaning operation is stopped, and closes the main path 50 from the RO membrane 18. Prevent water from flowing through the DI filter 19. That is, the solenoid valve 34 shuts off the water passage in association with the stop of the purification operation, and opens the water passage in association with the restart of the purification operation.

In the water purifier 1D shown in FIG. 5, the solenoid valve 34 is turned off in conjunction with the stoppage of the purifying operation, so that the purification is possible without providing the tap 50b unlike the water purifier 1B shown in FIG. The pressure can be maintained during shutdown.

That is, in the case of the check valve 33, forward water flow continues until the water pressure in the path is lost. Therefore, in order to stop the purifying operation without stopping the purifying water discharge at the same time as the purifying operation is stopped, It is because it is necessary to interlock the opening mechanism with the purifying operation.

Further, as shown in the water purifying apparatus 1B shown in FIG. 3 or the water purifying apparatus 1D shown in FIG. 5, the electromagnetic valve 31 as a new opening/closing mechanism that is linked with the purifying operation is provided in the first drainage which is the latter stage of the RO membrane 18. The first drainage path 51 may be provided on the path 51 and opened during the purification operation, and the first drainage path 51 may be shut off during the purification operation stop. With this, in addition to the effects described above, when water that is constantly under pressure, such as tap water, is used as raw water, it is prevented that the water is always discarded through the first drainage route 51 when the purification operation is stopped. At the same time, the purified water can be immediately discharged when the operation is restarted without any time difference. This is because the water pressure in the first drainage path 51 is maintained by closing the solenoid valve 31 when the purification operation is stopped.

In the first and second embodiments, an example in which a check valve and a solenoid valve are used as the opening/closing mechanism provided between the RO membrane 18 and the DI filter 19 has been described. An example using a flow path switching mechanism for switching the path will be described.

[Embodiment 3]
Another embodiment of the present invention will be described below. For convenience of description, members having the same functions as the members described in the above embodiment are designated by the same reference numerals, and the description thereof will not be repeated.

(Structure of water purification device)
As shown in FIG. 6, the water purifier 1E according to the present embodiment is different from the water purifier 1 of the first embodiment, in place of the opening/closing mechanism 32 between the RO membrane 18 and the DI filter 19, the flow path switching mechanism 35. Is used. The water purifier 1E has the same configuration as the water purifier 1 of the first embodiment except that the flow path switching mechanism 35 is used instead of the opening/closing mechanism 32.

The flow path switching mechanism 35 is configured to switch between the first flow path (1) from the RO membrane 18 to the DI filter 19 and the second flow path (2) from the RO membrane 18 to the second drainage path 52. There is. Here, the flow path switching mechanism 35 switches to the first flow path (1) so that the water that has permeated the RO membrane 18 flows to the DI filter 19 during the purification operation, and the water that has permeated the RO membrane 18 when the purification operation is stopped. The second flow path (2) is switched so as not to flow into the DI filter 19. Accordingly, the flow path switching mechanism 35 has the same function as a check valve or a solenoid valve.

Therefore, the water purifier 1E according to the present embodiment can obtain the same effects as the water purifier 1 of the first embodiment and the

water purifiers

1A and 1C of the second embodiment.

Moreover, the channel switching mechanism 35 switches the concentrated water that permeates the RO membrane 18 by switching to the second channel (2) so that the water that has permeated the RO membrane 18 does not flow into the DI filter 19 when the purification operation is stopped. It can be discarded from the second drainage path 52. As a result, when the purification operation is stopped, concentrated water does not collect between the RO membrane 18 and the DI filter 19, so that when the purification operation is restarted, impurities contained in the initial water flowing from the RO membrane 18 to the DI filter 19 are removed. Therefore, the load on the DI filter 19 can be reduced.

It should be noted that when the purification operation is restarted, the flow path switching mechanism 35 does not immediately switch from the second flow path (2) to the first flow path (1), but after the predetermined time has elapsed, the second flow path (2) is switched to the first flow path (1). It is preferable to switch to the channel (1). In this case, when the purification operation is restarted, the water that has accumulated in the vicinity of the RO membrane 18 without passing through the DI filter 19, especially the water on the rear side that has permeated the RO membrane 18 (the water whose impurity concentration has increased during the operation stop) ) Is discarded from the second channel (2). Then, by switching to the first flow path (1), the water appropriately purified by the RO membrane 18 can be sent to the DI filer 19. As a result, the life of the DI filter 19 can be further extended.

Although the concentrated water may be discarded as it is from the second drainage path 52, the second drainage path 52 is connected to the latter stage of the flush solenoid valve 22 of the first drainage path 51, for example, as in the water purifier 1F shown in FIG. 7. You may do it. In this case, the concentrated water to be discarded can be collectively flowed in one path.

Further, as in the water purifying apparatus 1G shown in FIG. 8, the second drainage path is connected to the latter stage of the flush electromagnetic valve 22 of the first drainage path 51, and the latter stage of the confluence of the first drainage path 51 and the second drainage path. In addition, a solenoid valve 31 is provided as a new opening/closing mechanism linked with the cleaning operation. The solenoid valve 31 may open the first drainage path 51 during the purification operation and shut off the first drainage path 51 while the purification operation is stopped. In this case, the same effects as those of the

water purifiers

1B and 1D of the second embodiment are achieved. That is, for example, when raw water is water that is constantly subjected to water pressure, such as tap water, it is prevented that the water is always discarded through the first drainage route 51 when the purification operation is stopped, and the purified water is used when the operation is restarted. Discharging can be performed immediately without a time difference.

In addition, in the water purifier described in each embodiment, the DI filter 19 is arranged at the subsequent stage of the RO membrane 18. However, the filter is not limited to the DI filter 19 and may be an AC (activated carbon) filter or any filter that can adsorb and remove other impurities. The effect of the present invention is particularly exerted by the adsorption removal filter having a limited purification function.

The present invention is not limited to the above-described embodiments, and various modifications can be made within the scope of the claims, and the embodiments obtained by appropriately combining the technical means disclosed in the different embodiments. Is also included in the technical scope of the present invention. Furthermore, new technical features can be formed by combining the technical means disclosed in each of the embodiments.

1, 1A, 1B, 1C, 1D, 1E, 1F, 1G Water purifier 10 Pressure switch 11 Pressure reducing valve 12 PP filter 13 Front TDS
14 Water Temperature Meter 15 Front Flow Meter 16 AC Filter 17 Pump
18 RO film 19 DI filter (adsorption removing member)
20 Rear flow meter 21 Rear TDS
22

Flash Solenoid Valve

31, 34 Solenoid Valve 32 Opening/Closing Mechanism 33 Check Valve 35 Flow Path Switching Mechanism 50 Main Path 50a Intake Ports 50b, 51b Outlet 51 First Drainage Path (Disposal Path)
52 Second drainage route

Claims

A water purification device for purifying water using a reverse osmosis membrane and an adsorption removal member for adsorbing and removing impurities,
From the reverse osmosis membrane, on the path from the reverse osmosis membrane to the outlet of purified water, the adsorption removal member is arranged,
A water purifying device comprising a first blocking mechanism for blocking water from flowing in the water passage, on the water passage extending from the reverse osmosis membrane to the adsorption/removal member.
The water purifier according to claim 1, wherein the first blocking mechanism is provided at a position closer to the reverse osmosis membrane than the adsorption/removal member.
The water purifier according to claim 1 or 2, wherein the first shutoff mechanism is a check valve capable of passing water only in a forward direction.
A flow rate limiting valve that reduces the flow rate in the power-off state than in the power-on state is provided on the waste path from the reverse osmosis membrane to the wastewater outlet of the concentrated water generated by the purification process of the reverse osmosis membrane,
The water purifier according to any one of claims 1 to 3, wherein a second cutoff mechanism that cuts off water passing through the waste path is provided on the waste path.
5. The first shutoff mechanism and the second shutoff mechanism shut off the water passage in association with a stop of the purification operation, and open the water passage in association with restart of the purification operation. Water purification device described in.
The water purification device according to any one of claims 1 to 5, wherein the adsorption/removal member is a filter filled with an ion exchange resin.
The water purification device according to any one of claims 1 to 6, wherein a drainage route for draining water on a route from the reverse osmosis membrane to the first blocking mechanism is provided.
The first blocking mechanism is a flow path switching mechanism that switches a first flow path from the reverse osmosis membrane to the adsorption removal member and a second flow path from the reverse osmosis membrane to the drainage path. The water purification apparatus according to claim 7.
A household water purifier comprising the water purifier according to any one of claims 1 to 8.