JP7346447B2 - Water purification equipment and household water purifiers - Google Patents

Description

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

In recent years, water purification devices using reverse osmosis membranes (RO membranes) have been proposed.

Since it is very difficult to completely separate water molecules and impurities using an RO membrane, if further purification is required, for example, Patent Document 1 discloses that a plurality of purification mechanisms using RO membranes are provided. A technique for increasing purity by repeating the steps has been disclosed.

In recent years, a method using ion exchange resins has been adopted as a new means for increasing the purity of purified water. Specifically, a filter (hereinafter referred to as DI filter) filled with ion exchange resin in a water passing case is placed after the RO membrane, and purified water that has passed through the RO membrane is passed through the DI filter to remove remaining impurities. High purification performance is obtained by further removing (for example, Patent Document 2).

Japanese Patent Publication “Unexamined Patent Publication No. 2006-263542” Japanese Patent Publication “Unexamined Japanese Patent Publication No. 2013-107031”

By the way, while water purification using the above-mentioned DI filter has the advantage of a simpler structure compared to the repeated purification method using an RO membrane, there is a limit to the purification function of the DI filter, and a certain amount of water cannot be purified. There is a problem that when impurities are removed, the function is lost. For this reason, in water purification using a DI filter, it is required to maintain its function for a longer period of time, and it is necessary to devise ways to suppress the consumption of its performance. This applies not only to DI filters, but also to general adsorption and removal members that adsorb and remove impurities that have a limited purification function.

One aspect of the present invention aims to realize a water purification device that can reduce wear and tear on the adsorption and removal member and suppress deterioration of functionality when an RO membrane and an adsorption and removal member that adsorbs and removes impurities are used together. do.

In order to solve the above problems, a water purification device according to one 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 disposed on the path from the osmosis membrane to the outlet for purified water purified by the reverse osmosis membrane, and the adsorption/removal member is disposed on the water path from the reverse osmosis membrane to the adsorption/removal member. A first blocking mechanism is provided to block the flow of water in the water path, and the power is turned off when the power is turned off on the waste path from the reverse osmosis membrane to the waste port of concentrated water generated by the purification process of the reverse osmosis membrane. The present invention is characterized in that a flow rate limiting valve is provided to reduce the flow rate in the state, and a second shutoff mechanism is provided on the waste path to block water flow through the waste path.
Further, in order to solve the above problems, a water purification device according to another 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 disposed on a path from the reverse osmosis membrane to an outlet for purified water purified by the reverse osmosis membrane, and the adsorption/removal member is disposed on a water flow path from the reverse osmosis membrane to the adsorption/removal member. , a first blocking mechanism is provided for blocking the flow of water in the water flow path, a drainage path is provided for draining water on the path from the reverse osmosis membrane to the first blocking mechanism, and the first blocking mechanism is provided. When the water flow route is not blocked by the blocking mechanism, purified water reaches the outlet opening/closing mechanism from the reverse osmosis membrane via the adsorption/removal member and the outlet, and the water flow route is blocked by the first blocking mechanism. When the reverse osmosis membrane is opened and closed, the path from the reverse osmosis membrane to the outlet is blocked, and water flows from the reverse osmosis membrane to the drainage path and is drained without reaching the outlet opening/closing mechanism. There is.

According to one aspect of the present invention, it is possible to realize a water purification device that can reduce wear and tear on the adsorption/removal member and suppress deterioration of function.

BRIEF DESCRIPTION OF THE DRAWINGS It is a schematic diagram which shows the rough structure of the water purification apparatus based on Embodiment 1 of this invention. It is a schematic diagram showing the rough structure of the water purification device concerning Embodiment 2 of the present invention. It is a schematic diagram which shows the modification of the water purification apparatus shown in FIG. It is a schematic diagram showing the rough structure of the water purification device concerning Embodiment 3 of the present invention. 5 is a schematic diagram showing a modification of the water purification device shown in FIG. 4. FIG. It is a schematic diagram showing the rough structure of the water purification device concerning Embodiment 4 of the present invention. FIG. 7 is a schematic diagram showing a modification of the water purification device shown in FIG. 6; FIG. 7 is a schematic diagram showing another modification of the water purification device shown in FIG. 6.

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

(Configuration of water purification device)
As shown in FIG. 1, a water purification device 1 is a domestic water purification device that uses a reverse osmosis membrane (RO membrane) and a filter filled with ion exchange resin (DI filter). This water purifier 1 includes a main path (route) 50 that takes in raw water from an intake port 50a at one end and discharges purified water from an intake port 50b at the other end. When the water purifier 1 is a domestic water purifier, the intake port 50a is connected to tap water (raw water), and the outlet opening/closing mechanism such as a faucet is connected to the outlet 50b. Further, a first drainage path (disposal path) 51, which will be described later, is connected to, for example, a drainage pipe under the sink.

In order from the most upstream side of the main path 50, the pressure switch 10, solenoid valve 31, pressure reducing valve 11, PP (polypropylene) filter 12, front TDS 13, water temperature gauge 14, front flow meter 15, AC (activated carbon) filter 16, Pump 17, 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 is turned on when the pressure exceeds a certain level, and is turned on when raw water is supplied to the main path 50 and the pressure of the raw water (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 nonwoven fabric made of polypropylene (PP), and removes relatively large impurities such as rust contained in raw water. Note that the material is not limited, and may be made of polyethylene (PE). By removing relatively large impurities before they arrive, it is possible to suppress deterioration of the reverse osmosis membrane (hereinafter referred to as RO membrane), which will be described later.

The front TDS 13 and the rear 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 quality of raw water taken in from the intake port 50a, and the rear TDS 21 measures the quality of purified water taken out from 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 to calibrate the front TDS 13 and the rear TDS 21. This is because the electrical conductivity measured by the front TDS 13 and the rear TDS 21 has temperature dependence. The detection results are output to the control section.

The AC filter 16 uses activated carbon to remove free substances such as free chlorine compounds contained in raw water. Note that the RO membrane 18 deteriorates due to free chlorine compounds (so-called chlorine) contained in tap water, which is raw water. Therefore, by removing free chlorine compounds with the AC filter 16 before reaching the RO membrane 18, deterioration of the RO membrane 18 can be suppressed.

The pump 17 is for sending water to the subsequent RO membrane 18 while applying a predetermined pressure, and is used to realize a cross-flow system using the RO membrane 18, which will be described later.

The front flowmeter 15 and the rear flowmeter 20 are sensors that measure the flow rate of water flowing into the main path 50. The measurement results are output to the control unit, and the control unit calculates the amount of purified water produced from the amount of raw water taken in (amount used), which is the measurement value of the front flowmeter 15, and the amount of purified water, which is the measurement value of the rear flowmeter 20. Calculate the recovery rate.

The front flowmeter 15 is preferably arranged between the PP filter 12 and the AC filter 16, as shown in FIG. This is because by arranging it after the PP filter 12 (on the downstream side), it is possible to prevent dirt from adhering to the front flow meter 15.

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

The RO membrane 18 separates water molecules and impurities. Here, water to be purified is made to flow over the surface of the RO membrane 18 while applying water pressure by the pump 17, thereby separating the treated water that has passed through the RO membrane 18 and the waste water that has not passed through it. The RO membrane 18 separates treated water (purified water) and waste water (concentrated water) using a so-called cross-flow system.

The treated water flows through the main path 50 to the DI filter 19 after the RO membrane 18, and the waste water is discharged from the waste port of the first drainage path 51. The waste outlet is connected, for example, to a drain pipe under the sink, as described above.

A flush solenoid valve 22 is provided in the first drainage path 51 . The flush electromagnetic valve 22 is a flow rate limiting valve that limits the flow rate of waste water flowing into the first drain path 51 . For example, the flush solenoid valve 22 restricts the flow rate when it is closed (power off state (de-energized)), and releases the flow path as much as possible when it is open (power on state (when energized)). It functions like flowing.

(Purification by RO membrane 18)
According to the RO membrane 18, highly pure water can be obtained by removing almost all impurities dissolved in water, regardless of whether they are harmful or harmless. The RO membrane 18 is made of a cross-linked network-like polymer membrane, and depending on the size of the network, basically only water molecules permeate through this polymer membrane, so it is difficult to mix with impurities. Separation was carried out, and the purification performance described above could 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 the water pressure is taken out as purified water, and the water that has passed through the RO membrane 18 is taken out as purified water. In this method, the remaining water is disposed of as wastewater. Therefore, in the cross-flow method, impurities and water molecules are separated by constantly passing liquid through the surface of the RO membrane 18. As water on the drainage side flows over the surface of the RO membrane 18, only water molecules permeate through the RO membrane 18 and are lost. The impurities are relatively concentrated, and the waste is discarded in a state where the concentration has increased. In this way, water purification using the RO membrane 18 involves a certain amount of waste water (concentrated water).

Here, in order to pass water over the surface of the RO membrane 18 while applying water pressure, a Pump 17 (electric pump) placed before the RO membrane 18 and a pump 17 placed on the first drainage path 51 after the RO membrane 18 are used. A flush solenoid valve 22 is used as a flow rate limiting mechanism. By restricting the flow rate at the latter stage of the RO membrane 18 with respect to the amount of water sent by the pump 17, the pressure in the path from the pump 17 to the flash solenoid valve 22 through the surface of the RO membrane 18 is increased with the help of the pump 17. . As this pressure becomes higher, the amount of purified water that permeates through the RO membrane 18 also increases.Actually, taking these balances into consideration, the pump 17 should be adjusted in order to obtain the desired pressure and purified water. Determine performance and flow restriction amount.

As described above, the flush electromagnetic valve 22 has the function of restricting the flow rate as described above in the closed state, and opening the flow path as much as possible to allow water to flow in the open state. Thereby, in addition to the function of applying pressure on the surface of the RO membrane 18 to generate purified water, the two functions of flushing the surface of the RO membrane 18 by passing a large amount of water as necessary are electrically switched.

Further, as described above, since the RO membrane 18 has a fine structure, it is common practice to pre-treat the water to be purified in order to maintain this performance. For example, removal of deposits, particulates, sticky substances, etc. using a filter made mainly of fibers such as PP (polypropylene) or PE (polyethylene) (called a sediment filter, etc.: PP filter 12), This includes adsorption and removal of chlorine, organic substances, etc. used in water sterilization, etc., by the filter (AC filter 16).

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

(Functions and effects of opening/closing mechanism 32)
The opening/closing mechanism 32 is provided in the middle of the path (main path 50) connecting the RO membrane 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 to allow water to flow during the purification operation, and shuts off the main path 50 to block the flow of water across the opening/closing mechanism 32 when the purification operation is stopped.

As a result, the total amount of impurities removed by the DI filter 19 during the period when the purification operation is stopped is suppressed, and by preventing unnecessary consumption of purification performance, the purification function of the DI filter 19 can be used for a longer period of time. I can do it.

Normally, when water purification operation is being carried out continuously, purified water and waste water with concentrated impurities are separated with the RO membrane 18 in between, and the DI filter 19 is filled with water with few impurities. Only water purified by the RO membrane 18 is supplied. However, when the purification operation is stopped and water no longer flows through the water purification device 1, impurities contained in the water remaining in the region before passing through the RO membrane 18 are transferred to the purified water side that has passed through the RO membrane 18. A phenomenon occurs in which water passes through the RO membrane 18 and diffuses over time. Therefore, if the path blocking mechanism (opening/closing mechanism 32) as described above is not provided, the impurities that have passed through the RO membrane 18 in this way will gradually diffuse to the DI filter 19, and the ions in the DI filter 19 will be Purified by exchange resin. This phenomenon continues until the impurity concentration in the water sandwiching the RO membrane 18 becomes equal, so eventually the impurities in the water remaining in the entire area on the front side of the RO membrane 18 are removed by the DI filter 19. This will continue until it is purified. Therefore, even impurities that should originally be discarded as concentrated water by the RO membrane 18 are purified by the DI filter 19, and a large amount of the purification performance of the DI filter 19 is 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 membrane 18 and the DI filter 19, the above-mentioned substance diffusion can be prevented. The accompanying impurities can be prevented from reaching the DI filter 19.

As mentioned above, in order to narrow the diffusion range of impurity substances across the RO membrane 18 as much as possible and reduce the amount of impurities that the DI filter 19 purifies when the purification operation is restarted, the opening/closing mechanism 32 is connected to the RO membrane as much as possible. It is desirable to install it near 18.

(effect)
According to the above configuration, when the purification operation is stopped, diffusion of impurities seeped out from the RO membrane 18 can be suppressed by the opening/closing mechanism 32. As a result, fewer impurities reach the DI filter 19, and there is no need to remove unnecessary impurities when the purification operation is stopped, so that deterioration of the DI filter 19 can be suppressed, that is, the service life can be extended. That is, according to the water purification device 1, in the purification mechanism that performs purification with the RO membrane 18 and then with the DI filter 19, unnecessary consumption of the purification performance of the DI filter 19 is prevented and the functional life is maintained for a long time. can do.

Furthermore, if the opening/closing mechanism 32 is installed as close to the RO membrane 18 as possible (in a position immediately after it), the diffusion of concentrated water floating around the RO membrane 18 when the purification operation is stopped can be prevented from reaching the DI filter 19 as much as possible. be able to. Thereby, the functional life of the DI filter 19 can be further extended.

In this embodiment, the opening/closing mechanism 32 provided on the way between the RO membrane 18 and the DI filter 19 is one that opens and closes without electricity (for example, a manual opening/closing mechanism (valve), a check valve). Alternatively, it may be something that opens and closes using electricity (for example, a solenoid valve, etc.).

[Embodiment 2]
Other embodiments of the invention will be described below. For convenience of explanation, members having the same functions as the members described in the above embodiment are given the same reference numerals, and the description thereof will not be repeated.

(Configuration of water purification device)
As shown in FIG. 2, unlike the water purifier 1 of the first embodiment, the water purifier 1A according to the present embodiment has an opening/closing mechanism 32 between the RO membrane 18 and the DI filter 19 in the forward direction (here In this case, a check valve 33 that allows water to flow 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 a check valve 33 is used as the opening/closing mechanism 32, the forward water pressure opens the valve to allow water to flow during the purification operation. However, when the operation is stopped, the water pressure is lost and the valve closes, so it is possible to cut off the diffusion of impurities across the valve, and the operation of the opening/closing mechanism can be automatically linked with the purification operation, which is convenient. is born.

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

[Modified example]
As shown in FIG. 3, the water purifier 1B according to the present modification flushes the solenoid valve (second shutoff mechanism) 31 disposed between the pressure switch 10 and the pressure reducing valve 11 in the water purifier 1A shown in FIG. An example is shown in which the valve is disposed downstream of the electromagnetic valve 22. In the water purifier 1B, a faucet is provided at the outlet 50b of the main path 50 as a type of opening/closing mechanism for opening and closing the outlet 50b. In this case, the action of opening the faucet turns on the power to the water purifier 1, and the action of closing the faucet turns off the power of the water purifier 1.

Therefore, it is possible to stop the purification operation by closing the faucet. Thereby, when the purification operation is stopped, the solenoid valve 31 can be turned off and the first drainage path 51 can be closed, so that the concentrated water flowing from the flush solenoid valve 22 is not discarded. Moreover, since the faucet provided at the outlet 50b of the main path 50 is closed when the purification 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. Thereby, when the purification operation is restarted, purified water can be taken out without any time lag. That is, in addition to the check valve 33, a faucet, which is a type of outlet opening/closing mechanism, is provided at the outlet 50b, and the opening and closing of this faucet is linked to the purification operation. As a result, in addition to the effect that purified water can be taken out without a time lag when the purification operation is resumed, there is also the effect that the discharge of purified water can be immediately stopped when the purification operation is stopped.

Note that the solenoid valve 31 may be arranged between the RO membrane 18 and the flash solenoid valve 22. In this case as well, the same effect as when the solenoid valve 31 is arranged downstream of the flush solenoid valve 22 can be obtained.

Note that a solenoid valve may be used as the check valve 33 of the water purification device 1A shown in FIG. 2 as an opening/closing mechanism linked to the purification operation. For example, as shown in the water purifier 1C shown in FIG. 4, a solenoid 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 purification operation, opens the main path 50 to allow water to flow from the RO membrane 18 to the DI filter 19, and turned off when the purification operation is stopped, closing the main path 50 and allowing water to flow from the RO membrane 18 to the DI filter 19. Prevent water from flowing into the DI filter 19. That is, the electromagnetic valve 34 shuts off the water passage when the purification operation is stopped, and opens the water passage when the purification operation is restarted.

In the water purification device 1D shown in FIG. 5, the solenoid valve 34 is turned off in conjunction with the stop of the purification operation, so the purification can be performed without installing a faucet at the outlet 50b as in the water purification device 1B shown in FIG. Pressure can be maintained when the operation is stopped.

In other words, in the case of the check valve 33, water continues to flow in the forward direction until the water pressure in the path is lost, so in order to stop the discharge of purified water without any time difference when the purification operation is stopped, it is necessary to connect a faucet to the water intake. This is because it is necessary to provide a valve opening mechanism and to link the purification operation.

Furthermore, as shown in the water purification device 1B shown in FIG. 3 or the water purification device 1D shown in FIG. It may be provided on the route 51, and the first drainage route 51 may be opened during the purification operation, and the first drainage route 51 may be shut off when the purification operation is stopped. In addition to the above-mentioned effects, this prevents water from being constantly disposed of through the first drainage path 51 when the purification operation is stopped, for example, when the raw water is water that is constantly under pressure, such as tap water. At the same time, when restarting operation, purified water can be discharged immediately without any time lag. This is because the water pressure in the first drainage path 51 is maintained by closing the electromagnetic valve 31 when the purification operation is stopped.

In the first and second embodiments described above, an example was explained in which a check valve or a solenoid valve was used as the opening/closing mechanism provided between the RO membrane 18 and the DI filter 19. An example using a channel switching mechanism for switching channels will be described.

[Embodiment 3]
Other embodiments of the invention will be described below. For convenience of explanation, members having the same functions as the members described in the above embodiment are given the same reference numerals, and the description thereof will not be repeated.

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

The flow path switching mechanism 35 switches between a first flow path (1) from the RO membrane 18 to the DI filter 19 and a 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 passed through the RO membrane 18 flows to the DI filter 19 during purification operation, and the water that has passed through the RO membrane 18 when the purification operation is stopped. Switch to the second flow path (2) so that it does not flow into the DI filter 19. Thereby, the flow path switching mechanism 35 performs the same function as a check valve or a solenoid valve.

Therefore, the water purifier 1E according to this 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 flow path switching mechanism 35 switches the concentrated water that passes through the RO membrane 18 to the second flow path (2) so that the water that has passed through the RO membrane 18 does not flow into the DI filter 19 when the purification operation is stopped. It can be disposed of through the second drainage path 52. As a result, when the purification operation is stopped, concentrated water does not accumulate between the RO membrane 18 and the DI filter 19, so when the purification operation is restarted, the 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.

Note 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 a predetermined period of time has passed, the flow path switching mechanism 35 switches from the second flow path (2) to the first flow path (1). It is preferable to switch to flow path (1). In this case, when the purification operation is restarted, the water does not flow through the DI filter 19 and remains in the vicinity of the RO membrane 18, especially the water on the latter stage that has passed through the RO membrane 18 (water whose impurity concentration increased during the operation stop). ) is discarded from the second channel (2). Thereafter, by switching to the first flow path (1), water properly purified by the RO membrane 18 can be sent to the DI filter 19. Thereby, the life of the DI filter 19 can be further extended.

Although the concentrated water may be disposed of directly from the second drainage path 52, for example, as in the water purification device 1F shown in FIG. You can do it like this. In this case, the concentrated water to be disposed of can be routed all together in one path.

Furthermore, as in the water purification device 1G shown in FIG. A solenoid valve 31 is provided as a new opening/closing mechanism that is linked to the purification operation. The electromagnetic valve 31 may be configured to open the first drainage path 51 during the purification operation, and to shut off the first drainage path 51 when the purification operation is stopped. In this case, the same effects as the water purifiers 1B and 1D of the second embodiment are achieved. In other words, when the raw water is water that is constantly under water pressure, such as tap water, this prevents the water from being constantly discarded through the first drainage path 51 when the purification operation is stopped, and also prevents the water from being constantly discarded through the first drainage path 51 when the purification operation is stopped. Discharge can be performed immediately without any time lag.

In addition, in the water purification apparatus described in each embodiment, the DI filter 19 is arranged after 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. What is particularly effective with this invention is an adsorption/removal filter that has a limited purification function.

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

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 gauge 15 Front flow meter 16 AC filter 17 Pump
18 RO membrane 19 DI filter (adsorption removal member)
20 Rear flow meter 21 Rear TDS
22 Flush solenoid valves 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 port 51 First drainage path (disposal path)
52 Second drainage route

Claims (9)

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 disposed on a path from the reverse osmosis membrane to an outlet for purified water purified by the reverse osmosis membrane,
A first blocking mechanism is provided on the water flow path from the reverse osmosis membrane to the adsorption removal member, which blocks water flow in the water flow path;
A flow rate restriction valve is provided on the disposal path from the reverse osmosis membrane to the disposal port of concentrated water generated by the purification process of the reverse osmosis membrane, which reduces the flow rate in the power-off state than in the power-on state,
A water purification device characterized in that a second blocking mechanism is provided on the waste path to block the flow of water on the waste path . 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 disposed on a path from the reverse osmosis membrane to an outlet for purified water purified by the reverse osmosis membrane,
A first blocking mechanism is provided on the water flow path from the reverse osmosis membrane to the adsorption removal member, which blocks water flow in the water flow path;
A drainage path is provided for draining water on the path from the reverse osmosis membrane to the first blocking mechanism,
When the water flow path is not blocked by the first blocking mechanism, purified water reaches the outlet opening/closing mechanism from the reverse osmosis membrane via the adsorption/removal member and the outlet;
When the water flow route is blocked by the first blocking mechanism, the route from the reverse osmosis membrane to the outlet is blocked, and water flows from the reverse osmosis membrane to the drainage route and then to the outlet opening/closing mechanism. A water purification device that is characterized by draining water without water reaching it . The water purification device according to claim 1 or 2 , wherein the first blocking mechanism is provided at a position closer to the reverse osmosis membrane than the adsorption/removal member. The water purification device according to any one of claims 1 to 3, wherein the first shutoff mechanism is a check valve that allows water to flow only in a forward direction. 1. The first shut-off mechanism and the second shut-off mechanism are configured to shut off the water passage when the purification operation is stopped, and open the water passage when the purification operation is resumed. The 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 ion exchange resin. The water purification device according to claim 1, further comprising a drainage path for draining water on the path from the reverse osmosis membrane to the first blocking mechanism. The first blocking mechanism includes a first flow path provided in the water flow path leading from the reverse osmosis membrane to the adsorption/removal member, and a first flow path leading from the reverse osmosis membrane to the drainage path without passing through the adsorption/removal member. The water purification device according to claim 7, further comprising a flow path switching mechanism that switches between the second flow path and the second flow path. A household water purifier comprising the water purifier according to any one of claims 1 to 8.

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