JP2011025114A - Switching type ro water purifier - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a switching type RO (reverse osmosis) water purifier where raw water is switched from stored water in a raw water tank to tap water in a tap water pipe in accordance with using purposes, applications or the like, and purifying treatment of high quality can be performed. <P>SOLUTION: When raw water feed is switched from stored water in a raw water tank 1 to tap water W, similarly to the stored water, it can be purified by an RO membrane device 9. The concentration of the purified water is monitored, and, when it exceeds a standard concentration, various abnormality information is notified, and, in accordance with the using conditions of the stored water in the raw water tank 1 or the tap water W, maintenance times in raw water exchange, tap water feed abnormality, RO membrane inspection or the like are correctly informed. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to an RO water purifier that uses an RO (Reverse Osmosis) membrane to obtain purified water used in apartment houses, restaurants, hotels, inns, offices, factories, leisure facilities, and the like, particularly raw water. The present invention relates to a switchable RO water purifier that can switch between tank storage water and tap water.

  Conventionally, as an example of this type of purified water generation system, for example, as shown in Patent Document 1, raw water pumped from a raw water tank is purified through an activated carbon filling tank and a filtration membrane filter and supplied to a supply destination. ing. In this purified water generation system, purified water is once stored in a water tank, and purified water is generated and stored so that the water level in the water tank is kept constant. It is described that a filtration membrane having pores of 0.01 to 0.5 μm is used for the filtration membrane filter.

  As the filtration membrane filter, a microfilter using a hollow fiber membrane or an ultrafilter using ultrafiltration is used. However, the removal of particles of about 0.01 μm is the limit of the effect of removing impurities by these filters. For this reason, impurities such as various chlorine compounds, trihalomethane, and dioxin dissolved in raw water are much smaller than 0.01 μm, and there is a problem that they cannot be removed by a filter membrane filter.

  From the standpoint of providing drinking water, tap water can be supplied to the raw water tank and supplied from the raw water tank in a place without a water tap, or directly from the water tap in a place with a water tap. It is preferable to supply water. However, from the viewpoint of water purification treatment, using the same water purification device for the raw water tank specification and tap water specification requires labor to replace parts in accordance with each specification. It was difficult to combine the specifications. However, water purifiers dedicated to raw water tanks and water purifiers dedicated to tap water each have one that is used alone, but did not have a function or structure that can be used for both.

JP-A-3-131383

  In view of the above-mentioned problems, the object of the present invention is a switched-type RO water purifier capable of performing high-quality water purification treatment by switching raw water to stored water in a raw water tank or tap water in a water pipe according to the purpose of use or application. Is to provide.

  The first aspect of the present invention is a raw water supply pipe that supplies raw water from a raw water supply section by a water pump, a raw water sensor that measures an impurity concentration of the raw water flowing through the raw water supply pipe, and the raw water supply pipe From a purification filter unit including at least a RO (Reverse Osmosis) membrane that removes impurities in the raw water by passing raw water and generates purified water, a purified water tank that stores the purified water, and the purification filter unit A purified water supply pipe that supplies purified water to the purified water tank, and a purified water supply unit that supplies the purified water from the purified water tank in a required amount, and a selector switch that selects a raw water tank or a water pipe as the raw water supply part; Depending on the switching setting of the selector switch, the raw water sensor measures the abnormal raw water concentration with respect to the water stored in the raw water tank or tap water from the water pipe. When a switched RO water purifier having an abnormality informing means for abnormality notification.

  According to a second aspect of the present invention, in the first aspect, when the raw water is supplied from the raw water tank through the raw water supply pipe, the concentrated water return pipe that returns the concentrated water generated by the purification action of the RO membrane to the raw water tank. When the raw water is supplied from the water pipe through the raw water supply pipe, the switchable RO water purifier includes a drain pipe for draining concentrated water generated by the purification action of the RO membrane.

  According to a third aspect of the present invention, in the first or second aspect, a purified water sensor that measures an impurity concentration of the purified water flowing through the purified water supply pipe, and supply of raw water of the stored water or tap water is started. After that, the earliest raw water concentration storage means for storing the earliest raw water concentration first measured by the raw water sensor, the purified water concentration storage means for storing the purified water concentration continuously measured by the water purification sensor, Comparing means for comparing the purified water concentration with the reference concentration calculated from the raw water concentration, and the abnormal notification means for reaching the abnormal raw water concentration when the purified water concentration is greater than the reference concentration. Switchable water purifier for notifying the replacement of the water, the supply abnormality of the tap water, or the replacement of the RO membrane.

  According to a fourth aspect of the present invention, in the first or second aspect, the raw water tank is switched to the raw water tank by a purified water sensor for measuring an impurity concentration of the purified water flowing through the purified water supply pipe and the changeover switch. When supplying the stored water from the tank, the first raw water concentration storage means for storing the first raw water concentration first measured by the raw water sensor, and the water switch is switched to the water pipe by the changeover switch. When the tap water is supplied, the reference tap water concentration storage means for storing a predetermined reference tap water concentration, the purified water concentration storage means for storing the purified water concentration continuously measured by the purified water sensor, and the stored water When the raw water is supplied, the reference concentration obtained from the first raw water concentration is compared with the purified water concentration, or when the tap water is supplied, the reference tap water concentration and the purified water are supplied. Using a raw water tank for notifying the replacement of the raw water and / or the replacement of the RO membrane on the condition that the purified water concentration is higher than the reference concentration. An abnormality notification means for abnormality in time and an abnormality notification means for abnormality in use of tap water for notifying the supply abnormality of the tap water and / or the replacement of the RO membrane on the condition that the purified water concentration is larger than the reference tap water concentration It is a switching type RO water purifier.

  The 5th form of this invention is a switching type RO water purifier provided with the water supply stop means which stops the water supply of the said water supply pump when the said purified water density | concentration exceeds the said abnormal raw water density | concentration in the 3rd form. .

  According to a sixth aspect of the present invention, in the fourth aspect, when the purified water concentration exceeds the reference concentration or the reference tap water concentration, the switching type is provided with a water supply stop unit that stops water supply of the water pump. RO water purifier.

  According to a seventh aspect of the present invention, in any one of the first to sixth aspects, when the stored water is supplied from the raw water tank by the switching setting of the changeover switch, the raw water tank is It is a switching type RO water purifier provided with an empty notification means for detecting and notifying that it has become empty.

  According to an eighth aspect of the present invention, in any one of the second to seventh aspects, the concentrated water return pipe includes a flow rate adjustment flow path for maintaining an osmotic pressure of the RO membrane at a predetermined value, and the flow rate adjustment flow. The switchable RO water purifier includes an openable and closable bypass flow path provided alongside a road, and opens the bypass flow path when the RO membrane is replaced.

  According to a ninth aspect of the present invention, in any one of the first to eighth aspects, the raw water sensor is a switching type RO water purifier comprising a sensor for measuring all soluble substances dissolved in water.

  According to a tenth aspect of the present invention, in any one of the third to eighth aspects, the water purification sensor is a switching type RO water purifier including a sensor for measuring all soluble substances dissolved in water.

  In an eleventh aspect of the present invention, in any one of the first to tenth aspects, the activated carbon treatment unit purifies the raw water by passing the activated water through at least the raw water introduction side flow path of the purification filter unit. It is a switching type RO water purifier which supplies raw water that has passed through the activated carbon tank to the RO membrane.

In this invention, a high quality water purification process is performed using a reverse osmosis membrane (RO membrane). The RO membrane is made of an artificial membrane having an infinite number of pores of about 0.0001 μm, has the same properties as a semipermeable membrane, and has fine impurities dissolved in water, such as bacteria, chlorine, arsenic, trihalomethane, Rust, dioxins, etc. can be removed. Therefore, by applying the pure water generation system using the RO membrane to the flow path of the raw water, it is possible to obtain purified water that is further purified than the filtration membrane filter.
According to the 1st form of this invention, in the purification system which purifies raw water with RO membrane, according to the switching setting of the said changeover switch, a raw | natural water tank or a water pipe is selected as said raw | natural water supply part, The said raw | natural water When abnormal raw water concentration is measured by the raw water sensor with respect to the water stored in the tank or the tap water from the water pipe, the abnormal notification means notifies the abnormality, so the raw water is not only stored in the raw water tank, Even when switching to water and supplying raw water, the RO membrane purifies the water and notifies the abnormality according to the use status of the water stored in the raw water tank or the tap water, and maintenance time such as raw water exchange or RO membrane inspection Can be accurately communicated, and high-quality water purification treatment can be performed. For example, if the switched-type RO water purifier according to this embodiment is used in a restaurant or the like, raw water can be supplied from a raw water tank pumped with tap water, natural water, etc., and drinking water can be supplied from the water purification providing unit, or a water tap In a use environment in which the water is close, water can be directly taken from the water pipe and purified as raw water to supply cleaning water. Therefore, in this embodiment, raw water can be freely selected without the need for parts replacement, and dedicated water purifiers are prepared for both the raw water tank specification and the water pipe specification in consideration of the installation status of the water tap. Therefore, it is possible to realize a water purifier that can be realized at low cost and that is convenient for use.

In particular, even when a raw water tank such as mineral water is used in a place where there is a water tap, the present invention is used when the raw water for storing the tank is insufficient, or when the raw water tank is broken, maintained, etc. In this case, it is possible to continue to generate drinking water by switching the raw water supply to tap water, so it is possible to supply drinking water even as an emergency measure, providing clean water without hindering the business of restaurants, hospitals, etc. Has the advantage of being able to
In addition, the said water purification tank may use the common tank which switches and stores the purified water obtained by using the stored water of the said raw water tank as raw water, and the purified water obtained using the tap water as raw water, and each purified water is separately used. You may make it prepare two types of water tanks to store.

In the purification of the filtration membrane filter, the entire amount of water passing through is taken out as purified water, but in the pure water treatment of the RO membrane, if the salts that did not pass through the membrane are not continuously discharged, the salt concentration on the pressurized side will be Since it rises indefinitely and osmotic pressure increases and water cannot pass through, the RO membrane always discharges water with concentrated salts and impurities (hereinafter referred to as concentrated water) continuously. .
According to the second aspect of the present invention, when the raw water is supplied from the raw water tank through the raw water supply pipe, the concentrated water generated by the purification action of the RO membrane is returned to the raw water tank by the concentrated water return pipe. Since it has a reprocessing system, the water that has passed through the RO membrane can be separated into purified water and concentrated water to increase the amount of recovered water (rate), so high-quality RO membrane purification treatment can be performed. Moreover, when raw water is supplied from the water pipe through the raw water supply pipe, the concentrated water is drained by the drain pipe, and water purification can be performed without any trouble even when the raw water is used.

  The RO membrane preferably has a membrane pore size of about 1 to 2 nanometers or less, and due to the reverse osmosis action by the RO membrane, all soluble substances contained in tap water, such as bacteria, arsenic, chlorine, etc. , Trihalomethane, rust, dioxin and the like can be removed.

  When returning the concentrated water to the raw water tank in the circulation type reprocessing system, the concentration of total dissolved substances or total dissolved solids (TDS) in the tank gradually increases, Since the burden increases and the removal rate of impurities decreases, it is necessary for workers such as users, water purification providers or maintenance contractors to periodically measure the TDS concentration in the tank and monitor the deterioration of the RO membrane. is there.

Therefore, according to the third aspect of the present invention, when the raw water tank is used, the impurity concentration of the stored water is measured in advance by the raw water sensor at least at the time of starting the supply of the raw water or at a predetermined time thereafter. Then, by comparing the initial measured value with the measured value of purified water measured by the purified water sensor with respect to the impurity concentration of purified water supplied to the purified water tank, the change of the impurity concentration in the raw water tank is compared. Clean water can be supplied while monitoring. That is, during operation of a purification circulation system that returns the concentrated water to the raw water tank and performs re-purification by the RO membrane, when the purified water concentration becomes higher than the reference concentration, the abnormality notification means causes the raw water Therefore, even if a worker does not regularly measure the concentration of purified water, it is possible to know the replacement of the raw water and / or the replacement of the RO membrane by the abnormality notification. This can save labor for maintenance work and can reduce the cost of water purification. On the other hand, when the tap water is used, the concentrated water is not circulated, but the impurity concentration of the tap water is measured in advance by the raw water sensor, and the initial measured value and the purified water supplied to the purified water tank. By comparing the measured value of the purified water measured by the purified water sensor with the comparison means by the comparison means, when the purified water concentration becomes higher than the reference concentration, the abnormal raw water concentration is reached. Since the supply abnormality is notified, it is not necessary for the worker to regularly measure the purified water concentration, labor saving of the maintenance work can be realized, and the purified water treatment cost can be reduced.
The form of the notification output in the present invention includes alarm sound, alarm lamp lighting / flashing, alarm display, and the like.

  In the third embodiment, the setting process of the reference value based on the measurement result of the raw water sensor is performed even when the tap water is used. However, the reference concentration value of the tap water is published and known. The reference value setting process can be omitted. That is, according to the fourth aspect of the present invention, when the raw water tank is used, as in the third aspect, the stored water impurities at least at the time of starting the supply of the raw water or at a predetermined time thereafter. Concentration is measured in advance by the raw water sensor, and the initial measured value is compared with the measured value of purified water measured by the purified water sensor with respect to the impurity concentration of purified water supplied to the purified water tank. When purified water is supplied while monitoring changes in the impurity concentration in the tank, and the purified water concentration becomes higher than the reference concentration, the raw water tank and / or the RO membrane are replaced by the abnormality notification means when the raw water tank is used. Therefore, even if the worker does not regularly measure the purified water concentration, it is possible to know the replacement of the raw water and / or the replacement of the RO membrane by the abnormality notification. Can be, can be realized labor saving of the maintenance work, it is possible to reduce the water treatment costs.

On the other hand, when supplying the tap water from the water pipe by switching to the water pipe by the changeover switch, the impurity concentration of the purified water supplied to the water purification tank is set based on the reference tap water concentration set and stored in advance. The comparison process of the measured value of the purified water measured with the said purified water sensor is performed. Therefore, according to the fourth embodiment, by using the reference tap water concentration of tap water, the setting process of the reference value in the third embodiment can be omitted, and as in the third embodiment, When the purified water concentration becomes higher than the reference tap water concentration, the abnormality notification means when the tap water is in use notifies the supply abnormality of the tap water and / or the replacement of the RO membrane. Even without measuring the concentration, it is possible to know the supply abnormality of the tap water and / or the replacement of the RO membrane by the abnormality notification, to realize the labor saving of the maintenance work, and to reduce the cost of the water purification treatment. it can.
The form of the notification output in the present invention includes alarm sound, alarm lamp lighting / flashing, alarm display, and the like.

  According to the fifth aspect of the present invention, when the purified water concentration exceeds the abnormal raw water concentration by the water supply stopping means, the water supply pump stops the water supply, so the purified water having a reduced purity is supplied to the purified water tank. Without sending water, the exchange of the raw water, the supply abnormality of the tap water, or the exchange of the RO membrane can be promoted.

  According to the sixth aspect of the present invention, when the purified water concentration exceeds the reference value when the stored water is used by the water supply stop means, or when the reference tap water concentration is exceeded when the tap water is used. Since the water supply of the water supply pump is stopped, it is possible to promote the replacement of the raw water, the abnormal supply of tap water, or the replacement of the RO membrane without supplying purified water having reduced purity to the water purification tank.

  Since the raw water sensor measures the impurity concentration of the raw water flowing through the raw water supply pipe, it is possible to monitor the raw water supply state of the raw water tank, that is, the empty state of the tank. That is, according to the seventh aspect of the present invention, when the stored water is supplied from the raw water tank by the switching setting of the changeover switch, the empty notification means notifies that the raw water tank is empty. Therefore, it is possible to appropriately know the replacement time of the raw water, simplify the supervision work of the raw water tank, and contribute to the reduction of water purification costs.

  According to an eighth aspect of the present invention, the concentrated water return pipe includes a flow rate adjusting flow path that maintains the osmotic pressure of the RO membrane at a predetermined value, and an openable and closable bypass flow that is provided in the flow rate adjusting flow path. And when the RO membrane is replaced, the raw water is pressurized after opening the bypass channel at the initial stage of water flow. When the water pressure of the RO membrane exceeds a predetermined value, the bypass flow path can be closed, and the re-operation after the RO membrane replacement is automated to realize labor saving and automation of water purification treatment. be able to.

  According to the ninth or tenth aspect of the present invention, since the raw water sensor and the water purification sensor are composed of TDS sensors that measure all soluble substances dissolved in water, the impurity concentrations of the raw water and the purified water respectively. Can be measured with high accuracy, and the time of replacement of the raw water, abnormal supply of the tap water or the time of replacement of the RO membrane can be appropriately detected and notified.

  According to the eleventh aspect of the present invention, at least the raw water introduction-side flow path of the purification filter unit is provided with an activated carbon treatment unit that purifies the raw water through the activated carbon tank, and the raw water that has passed through the activated carbon tank Since water is passed through the RO membrane, before the supply to the RO membrane, harmful substances in the raw water are adsorbed and removed by the activated carbon tank to produce highly purified water from which impurities are removed more efficiently. can do.

It is a schematic block diagram of the water purification system which is one Embodiment of this invention. It is a flowchart which shows the water purification process control in the said water purification system. It is a flowchart which shows the water purification process control performed by the time of tap water use which is a part of the said water purification process program. It is a flowchart which shows the water intake process control in the said water purification system. It is a flowchart which shows the monitoring process of the stored water amount in the said purified water processing system, and a purified water sterilization process. It is a flowchart which shows the water purification process control of the said water purification system which is another embodiment of this invention.

A water purification system including a switching type RO water purifier according to an embodiment of the present invention will be described below with reference to the drawings.
FIG. 1 is a schematic configuration diagram of a water purification system of the present embodiment. In FIG. 1, the flowing water flow path is indicated by a solid line, and the signal line of the electric system to the solenoid valve or the like is indicated by a broken line.

  The switched-type RO water purifier in this water purification system is a raw water tank 1 for storing raw water (reserved water) 2 such as high-grade water and tap water, and a raw water supply for supplying and supplying raw water 2 from the raw water tank 1 by a water supply pump 4. The raw water sensor 5 that measures the impurity concentration of the raw water 2 flowing through the pipe 3, the raw water supply pipe 3, and the RO that passes through the raw water 2 from the raw water supply pipe 3 to remove the impurities in the raw water 2 and generates purified water. The purification filter unit including the membrane device 9, the concentrated water return pipe 23 for returning the concentrated water generated by the purification action of the RO membrane to the raw water tank 1, the purified water tank 26 for storing the purified water 29, and purified water from the purification filter unit A purified water supply pipe 24 that supplies the purified water tank 26, a purified water sensor 25 that measures the impurity concentration of purified water that flows through the purified water supply pipe 24, and a purified water supply unit that supplies the required amount of purified water 29 from the purified water tank 26, A. As the high-grade water, mineral water or the like obtained by filtering spring water or deep water with activated carbon and further heating or filter sterilizing is used. The volumes of the raw water tank 1 and the purified water tank 26 are 10 to 20 liters and 4 to 8 liters, respectively.

  The raw water supply pipe 3 is branched and connected to a tank water supply pipe 3A and a tap water supply pipe 3B via an electromagnetic three-way valve 3C. The starting end of the tank water supply pipe 3 </ b> A is immersed in the raw water tank 1. The tap water supply pipe 3B communicates with the water pipe 3E via the water valve 3D. An electromagnetic three-way valve 23A is installed in the middle of the concentrated water return pipe 23, and a drain pipe 23B from which the concentrated water is drained without returning to the raw water tank 1 is branched and connected to the electromagnetic three-way valve 23A. Yes. The concentrated water feed direction is switched between the return side of the raw water tank 1 and the drain side of the drain pipe 23B by electromagnetic switching by the electromagnetic three-way valve 23A. The electromagnetic three-way valve 23A is switch-controlled by a drive signal S10 from the control circuit unit 41. Instead of the electromagnetic three-way valve 23A, a manually operated three-way valve may be used.

  The purification filter section includes an RO membrane device 9 and three activated carbon tanks 7, 8, and 10 disposed before and after the RO membrane device 9. Two activated carbon tanks 7 and 8 are connected in series on the flow path side in front of the RO membrane device 9, and the activated carbon tank 9 is also connected in series on the rear side. The activated carbon tanks 7, 8, and 10 have a tower shape, and the water supply end 6 of the raw water supply pipe 3 is connected to the raw water inlet of the activated carbon tank 7 in the foremost stage. The raw water sensor 5 and the water pump 4 are disposed in the raw water supply pipe 3. The raw water sensor 5 includes a TDS sensor that measures the content of TDS contained in the raw water 2 pumped from the raw water tank 1 by the water pump 4. The raw water sensor 5 outputs a TDS measurement signal S8 of the raw water. The intake end of the raw water supply pipe 3 is extended to the vicinity of the bottom of the raw water tank 1. The water pump 4 is an electric pump, and is driven and controlled by a drive signal S4 from a control circuit unit 41 described later.

  The activated carbon tanks 7 and 8 are connected by a connecting pipe 11. The activated carbon tank 8 and the RO membrane device 9 are connected by a connecting pipe 12. The raw water 2 pumped from the raw water tank 1 sequentially passes through the activated carbon tanks 7 and 8 through the connecting pipes 11 and 12, and harmful substances such as chlorine ions and organic compounds contained in the raw water 2 due to the adsorption action of the activated carbon. Is removed by adsorption. A three-way valve 13 is disposed in the middle of the connecting pipe 12. When the activated carbon in the activated carbon tanks 7 and 8 is replaced, the three-way valve 13 is switched to the outlet channel 14 so that dust contained in the new activated carbon does not flow into the RO membrane, and the activated carbon tanks 7 and 8 are washed away inside the activated carbon tank. Process. After performing this activated carbon pretreatment, the three-way valve 13 is switched to the RO membrane device 9, and the raw water that has passed through the activated carbon tanks 7 and 8 is caused to flow into the water supply port (raw water introduction port) of the RO membrane device 9. Also on the rear side of the RO membrane device 9, a final stage activated carbon tank 10 is disposed via a connecting pipe 15.

  The RO membrane device 9 is a cylindrical container in which an RO membrane (not shown) is accommodated, and a water supply port, a pure water discharge port, and a concentrated water discharge port are provided on the container. Pure water from which impurities are highly removed is discharged from the pure water discharge port, and concentrated water generated by reverse osmosis is discharged from the concentrated water discharge port. As the RO membrane, a hollow fiber membrane, a spiral membrane, a tubular membrane or the like can be used, and as the membrane material, cellulose acetate, aromatic polyamide, polyvinyl alcohol, polysulfone or the like can be used.

  A purified water discharge port (pure water discharge port) of the RO membrane device 9 is connected to the activated carbon tank 10 via a connecting pipe 15. The concentrated water discharge port of the RO membrane device 9 is connected to the concentrated water return pipe 23 via the connecting pipe 18. The outlet of the concentrated water return pipe 23 is accommodated in the raw water tank 1, and the concentrated water enriched with impurities through the RO membrane is returned to the raw water tank 1 for reprocessing. The concentrated water returned to the raw water tank 1 becomes the raw water 2 and is sent again to the purification filter section by the water pump 6. The connection pipe 15 and the concentrated water return pipe 23 constitute a circulation processing system that returns the concentrated water to the raw water tank 1 as raw water and circulates it through the RO membrane device 9.

  The concentrated water return pipe 23 is branched from the connecting pipe 18 and has a flow rate adjusting channel 19 that maintains the osmotic pressure of the RO membrane of the RO membrane device 9 at a predetermined value, and a bypass flow that is provided in the flow rate adjusting channel 19. A path 20 is provided. A flow rate regulator 22 made of a predetermined orifice is disposed in the flow rate regulation channel 19. In order to exert the reverse osmosis action by the RO membrane of the RO membrane device 9, it is necessary to flow a pressurized flow through the RO membrane, so that the flow rate of the concentrated water flowing through the concentrated water return pipe 23 is set to a specific flow rate, for example 200 The pressure flow is generated at a limit of milliliters / minute.

  An electromagnetic valve 21 is installed in the bypass flow path 20 provided along with the flow rate adjustment flow path 19. When the raw water 2 of the raw water tank 1 or the tank itself is replaced, or when the activated carbon tanks 7, 8, 10 and the RO membrane device 9 are replaced, the electromagnetic valve 21 is switched to the open side at the initial stage of water flow and discharged from the RO membrane device 9. The concentrated water to be discharged is discharged in a large amount, and then, when the entire RO membrane is filled with water, the solenoid valve 21 is switched to the closed side to block the flow to the bypass flow path 20. By shutting off the bypass flow path 20, the concentrated water flows only in the flow rate adjustment flow path 19, and a pressurized flow is generated by narrowing the flow rate by the flow rate regulator 22, so that the reverse osmosis membrane action can be smoothly applied to the raw water. The solenoid valve 21 is controlled to open and close by a drive signal S5 from the control circuit unit 41.

  A three-way valve 16 is disposed in the middle of the connecting pipe 15 between the RO membrane device 9 and the activated carbon tank 10. When the RO membrane device 9 is replaced, the purified water that flows out first may be contaminated with activated carbon or a slight amount of dirt adhering to the RO membrane, so the three-way valve 16 is switched to the outlet-side flow path 17. Can be discharged to the outside. After performing this discharge process, the three-way valve 16 is switched to the activated carbon tank 10, and the purified water generated by the RO membrane device 9 is caused to flow into the purified water inlet of the activated carbon tank 10. The purified water introduced into the activated carbon tank 10 passes through the activated carbon tank 10, thereby removing a trace amount of harmful substances contained in the raw water 2 by the adsorption action of the activated carbon, and the purified water connected to the purified water drain of the activated carbon tank 10. The water is discharged to the purified water tank 26 through the supply pipe 24. The purified water sensor 25 provided in the purified water supply pipe 24 includes a TDS sensor that measures the content of TDS contained in the purified water. The water purification sensor 25 outputs a TDS measurement signal S3.

  The said purified water provision part is comprised so that the purified water of the purified water tank 26 can be provided as cold water or warm water through the faucet 38. The drain end of the purified water supply pipe 24 is attached to the upper cover 45 of the purified water tank 26, and the drain port faces the inside of the tank. A float valve 27 is provided at the drain end of the purified water supply pipe 24. Moreover, the ultraviolet germicidal lamp 31 and the liquid level sensor 32 are attached to the upper cover 45 of the water purification tank 26 toward the inside of the tank. The ultraviolet germicidal lamp 31 is controlled to be turned on / off by a control signal S 1 from the control circuit unit 41. The liquid level sensor 32 detects whether or not a predetermined amount of purified water is stored by contacting the stored purified water level. The liquid level sensor 32 is a detecting means for detecting that a predetermined amount of purified water is stored, has a float that moves up and down in accordance with the rise and fall of the liquid level, and detects the upper limit position and the lower limit position of the liquid level. It consists of a float switch. When the liquid level sensor 32 detects the upper limit position LH or the lower limit position LL of the liquid level, it outputs a detection signal S2. The control circuit unit 41 stops the water supply pump 4 by receiving the detection signal S <b> 2 and stops water supply to the water purification tank 26. When a predetermined time has elapsed after stopping the water supply, the control circuit unit 41 transmits the drive signal S4 to the water supply pump 4 to drive it, and starts the supply of purified water. By monitoring the amount of purified water by the liquid level sensor 32 and intermittently driving the water pump 4, the amount of purified water is controlled so that the purified water in the purified water tank 26 is maintained at a constant water level. Instead of the float switch of the liquid level sensor 32, a pair of level sensors for detecting the upper limit position LH and the lower limit position LL may be provided.

  When the float 28 is located above the upper limit detection position of the liquid level sensor 32 and the amount of stored water increases after the liquid level sensor 32 is detected, the float 28 operates with buoyancy due to the rise in liquid level. Then, the float valve 27 can be forcibly closed to urgently stop the supply of purified water. A drain pipe 43 is disposed on the bottom surface of the water purification tank 26, and the drain pipe 43 is opened and closed by the opening / closing valve 30.

  The water purification tank 26 is provided with a cooling device (not shown), and the stored water can be cooled to about 5 to 10 ° C. to be chilled. The cooling temperature can be set arbitrarily. Two intake pipes 33 and 42 are attached to the water purification tank 26 in communication with the tank. One end of the intake pipe 33 is extended inside the hot tank 34. The hot tank 34 is heated by a heater (not shown), and the purified water supplied from the purified water tank 26 through the intake pipe 33 is heated to warm it. A drain pipe 44 is disposed on the bottom surface of the hot tank 34, and the drain pipe 44 is opened and closed by an opening / closing valve 36. A hot water pipe 35 is connected to the hot tank 34, and an electromagnetic valve 37 and a faucet 38 are disposed at one end of the hot water pipe 35. The hot water in the hot tank 34 is drained from the faucet 38 through the hot water pipe 35 with the water pressure from the water purification tank 26.

An electromagnetic valve 40 is disposed at one end of the water intake pipe 42, and is further connected to a faucet 38 via a discharge pipe 39. The purified water in the purified water tank 26 is chilled by the cooling device, and is drained from the faucet 38 through the intake pipe 42 and the discharge pipe 39 as cold water by the water pressure from the purified water tank 26. The electromagnetic valves 37 and 40 are opened and closed by open / close signals S6 and S7 from the control circuit unit 41, respectively.
In addition, the solenoid valve etc. which move a plunger with the magnetic force of an electromagnet (solenoid) can be used for the solenoid valve in this embodiment. Moreover, TDS detection is possible for the raw | natural water sensor 5 and the water purification sensor 25 in the range of 0-2000 ppm, and a TDS sensor which has a resolution of 0.1-10 ppm can be used.

  The control circuit unit 41 includes a microprocessor, and has a program storage memory 46 for storing a water purification treatment program, a water intake treatment program, a germicidal lamp lighting control program, and a raw water switching program according to the present invention. The control circuit unit 41 is given a liquid level detection signal S2 of the liquid level sensor 32, a measurement signal S3 of the water purification sensor 25, and a measurement signal S8 of the raw water sensor 5, and a work memory 47 for storing these signal data is controlled. The circuit unit 41 is provided. As external output means, an alarm device 48 for alarming the replacement timing of the raw water or the RO membrane and a display 49 for displaying the alarm content are connected to the control circuit unit 41. As external input means, an input means 50 comprising various operation keys and a raw water selector switch 51 are connected to the control circuit unit 41. The raw water changeover switch 51 is a setting unit for switching and setting the raw water to be purified by the switching type RO water purifier according to the present embodiment to either the stored water or the tap water in the raw water tank 1. When the use of the raw water tank 1 is set by the raw water changeover switch 51, the raw water 2 of the tank stored water is passed through the raw water supply pipe 3. When the use of tap water is set by the raw water switch 51, the raw water 2 stored in the water pipe tank is passed through the raw water supply pipe 3.

FIG. 2 is a flowchart showing water purification treatment control executed by the water purification treatment program of the control circuit unit 41.
Prior to the start of the water purification treatment, various pretreatments are performed in advance. When the activated carbon tanks 7 and 8 are replaced, the activated carbon pretreatment is performed by manually opening and closing the three-way valve 13. Moreover, when the raw water 2 of the raw water tank 1 or the tank itself is replaced, when the activated carbon tanks 7, 8, 10 and the RO membrane device 9 are replaced, or when the raw water is switched, initial setting is performed (step ST1). That is, by giving an instruction input for starting the pretreatment of water purification to the control circuit unit 41 by the input means 50, the drive signal S5 is transmitted from the control circuit unit 41 at the initial stage of water flow, and the electromagnetic valve 21 is switched to the open side. Next, a large amount of the concentrated water discharged from the RO membrane device 9 is discharged, and when the entire RO membrane is filled with water, the solenoid valve 21 is switched to the closed side and the flow to the bypass flow path 20 is made. Shut off and automatically set to pressurized water flow.

  After the initial setting, the raw water to be used is confirmed by the raw water selector switch 51 (step ST2). When the use of the raw water tank 1 or the use of tap water is set by the switching operation of the raw water selector switch 51, the switching control of the electromagnetic three-way valve 3C and the electromagnetic three-way valve 23A is performed (step ST3).

When a new raw water tank 1 is installed, for example, by replacing the raw water tank 1 from the state of using tap water, that is, as shown in FIG. 1, the tank water supply pipe 3A and the concentrated water return in the raw water tank 1 In the state where the pipe 23 is immersed, the drive signal S9 is transmitted from the control circuit unit 41 to the electromagnetic three-way valve 3C, the flow path is switched from the tap water supply pipe 3B to the tank water supply pipe 3A, and the drive signal S10 is electromagnetically supplied. The concentrated water delivery channel is transmitted to the three-way valve 23 </ b> A and switched to the return side of the raw water tank 1, and the raw water tank is used in a state where water can be supplied to the raw water supply pipe 3 of the tank stored water.
Further, when the tap water is used temporarily for the replacement work of the raw water tank 1 from the stored water use state or when the raw water used is simply used as the tap water, the control circuit unit 41 can be used for electromagnetic three-way. The drive signal S9 is transmitted to the valve 3C, the flow path is switched from the tank water supply pipe 3A to the tap water supply pipe 3B, and the drive signal S10 is transmitted to the electromagnetic three-way valve 23A so that the concentrated water delivery flow path is connected to the drain side. The water supply valve 3D is opened, and the water supply pipe 3E is set to a tap water usage state in which the tap water W can be passed through the raw water supply pipe 3. A three-way valve that can be manually switched can be used as the electromagnetic three-way valve 3C. Further, two raw water supply pipes communicating with each of the tank water supply pipe 3A and the tap water supply pipe 3B may be connected to be switched and used without branching the single raw water supply pipe 3.

  When the stored water use state of the raw water tank 1 is set (step ST5), the water purification process after step ST6 is executed. By giving the start of the water purification treatment to the control circuit unit 41 by the input means 50, the water purification treatment is started (step ST4). First, the measured value of the raw water TDS concentration measured by the raw water sensor 5 is read (step ST6). The TDS data value is stored in the work memory 47 as the earliest raw water concentration C1 (step ST7). Next, a reference concentration C0 is calculated from the earliest raw water concentration C1 (step ST8). Generally, since the TDS of tap water used for the standard of raw water is 50 to 200 ppm, the reference concentration C0 is set to a value of, for example, 20% (α%) of the earliest raw water concentration C1, but the α value is the type of raw water Various settings can be made according to the degree of purification requirement. The calculated value of the reference density C0 is stored in the work memory 47 (step ST9). The reference concentration C0 corresponds to the target TDS removal rate for purification, and the α value can be arbitrarily set to the control circuit unit 41 so as to be arbitrarily set according to the concentration of raw water sources such as tap water and natural water. Can be set to In this embodiment, when the critical concentration is reached by comparing the reference concentration C0 with the actually measured concentration, the replacement time of the raw water or the RO membrane is discriminated. However, the raw water sensor 5 disposed in the raw water supply pipe 3 has a water flow rate. Can no longer be detected, it can be determined that the raw water tank 1 is empty, and the occurrence of an empty state of the tank can be notified.

  With the progress of water purification by the RO membrane device 9 and the activated carbon tanks 7, 8, and 10, purified water is sequentially transferred to the purified water tank 26 through the purified water supply pipe 24. At this time, purified water flowing to the purified water supply pipe 24 On the other hand, the TDS concentration is measured by the water purification sensor 25, and the measured value Ct is read (step ST10). When the raw water sensor 5 disposed in the raw water supply pipe 3 no longer detects water flow, the measured value Ct is not read (step ST11). Therefore, it is determined that the raw water tank 1 is empty, and the tank The occurrence of the empty state is notified (step ST14).

  When the measurement value Ct is normally read (step ST11), the average value of the purified water TDS concentration Ct within a predetermined time (for example, 1 minute) is calculated, and the average value of the purified water TDS concentration Ct and the reference The density C0 is compared (step ST12). When the purified water TDS concentration Ct becomes larger than the reference concentration C0 by this comparison, the driving of the water pump 4 is stopped by the drive signal S4, and an alarm process for prompting replacement of the raw water 2 and the RO membrane device 9 is performed (step ST13). . In the alarm processing, an alarm sound of the alarm device 48 is output and an alarm message on the display 49 is displayed. At this time, if the RO membrane device 9 mounting time (previous replacement time) is stored in advance and the required usage time of the RO membrane device 9 in use is displayed together with an alarm, the life of the RO membrane is shortened. Useful for judgment. When the purified water TDS concentration Ct does not exceed the reference concentration C0 by the comparison process (step ST12), the alarm process is not performed. Thereafter, the average value of the purified water TDS concentration Ct within the predetermined time (for example, 1 minute) is newly read, and the comparison process is repeated (steps ST10 to ST12).

  The comparison process (step ST12) corresponds to comparison means for comparing the reference concentration calculated from the earliest raw water concentration with the purified water concentration in the present invention. In addition, when the purified water concentration becomes higher than the reference concentration, the notification means for notifying the replacement of the raw water and / or the replacement of the RO membrane is configured by an alarm device 48, a display 49, and an alarm process (step ST13).

  As described above, in the purified water generation system provided with the concentrated water return flow path for returning the concentrated water generated by the purification action of the RO membrane to the raw water tank 1 by the concentrated water return pipe 23, at the start of the purified water treatment, By measuring the TDS concentration in advance with the raw water sensor 5 and comparing the reference value C0 calculated from the initial measurement value with the measured value Ct measured by the water purification sensor 25 for the TDS concentration of purified water supplied to the water purification tank 26, It becomes possible to supply purified water while monitoring changes in the impurity concentration in the raw water tank 1. Therefore, in the state where the stored water is used, it is possible to realize a purification circulation system in which the concentrated water is returned to the raw water tank 1 by the automatic monitoring by the raw water sensor 5 and the purified water sensor 25 and repurified by the RO membrane. It is possible to reduce the cost of water purification by reducing labor costs for maintenance and reducing labor costs required for maintenance.

  FIG. 3 is a flowchart showing water purification control executed when using tap water, which is a part of the water purification treatment program. When the tap water W is set to the use state (step ST5), the water purification process after step ST15 is executed. By giving the start of the water purification treatment to the control circuit unit 41 by the input means 50, the water purification treatment is started (step ST4). In the present embodiment, a known value that is generally available is set and stored in advance in the work memory 47 as the reference tap water concentration Cw as the reference concentration of tap water. As described above, the TDS of tap water used for raw water is 50 to 200 ppm. When the fluctuation of the reference concentration of tap water is small, it may be fixed and stored in the program storage memory 46. The input of the reference tap water concentration Cw can be performed by the input means 50 (step ST16).

  When the reference tap water concentration Cw is set and stored (steps ST15 and S16), the TDS concentration is measured by the purified water sensor 25 for the purified water flowing through the purified water supply pipe 24 in the same manner as when the stored water is used. The measured value Ct is read (step ST18). When the raw water sensor 5 disposed in the raw water supply pipe 3 no longer detects water flow, the measured value Ct is not read (step ST18), so that it is determined that the water supply is abnormal and that is notified ( Step ST21). When the measurement value Ct is normally read (step ST18), the average value of the purified water TDS concentration Ct within a predetermined time (for example, 1 minute) is calculated, and the average value of the purified water TDS concentration Ct and the reference The tap water concentration Cw is compared (step ST19). When the purified water TDS concentration Ct becomes larger than the reference tap water concentration Cw by this comparison, the driving of the water pump 4 is stopped by the drive signal S4, and an alarm process for prompting replacement of the raw water 2 and the RO membrane device 9 is performed (step) ST20). In the alarm processing, an alarm sound of the alarm device 48 is output and an alarm message on the display 49 is displayed. At this time, if the RO membrane device 9 mounting time (previous replacement time) is stored in advance and the required usage time of the RO membrane device 9 in use is displayed together with an alarm, the life of the RO membrane is shortened. Useful for judgment. When the purified water TDS concentration Ct does not exceed the reference tap water concentration Cw by the comparison process (step ST19), the alarm process is not performed. Thereafter, the average value of the purified water TDS concentration Ct within the predetermined time (for example, 1 minute) is newly read, and the comparison process is repeated (steps ST17 to ST19).

  According to the present embodiment, the raw water is not only stored in the raw water tank 1, but is also purified by the RO membrane even when the raw water is switched to the tap water W, and the stored water or the tap water W in the raw water tank 1 is used. Depending on the situation, various kinds of abnormality notifications can be performed to accurately notify maintenance timing such as raw water exchange and RO membrane inspection, and high-quality water purification treatment can be performed. That is, when the switching type RO water purifier according to the present embodiment is used in, for example, a restaurant, raw water can be supplied from a raw water tank such as natural water to generate and supply drinking water. On the other hand, when tap water is used as an emergency measure at the time of failure of the raw water tank or maintenance work, or when tap water is always used, water can be taken from the water pipe 3E and purified to supply purified water. . Therefore, the water purifier according to the present embodiment is not limited by the installation status of the water tap, and is convenient for use. Therefore, the raw water can be freely selected according to the purpose of use and the mode, and it takes time to replace parts. Therefore, it is possible to freely select raw water, and it is not necessary to prepare a dedicated water purifier for each of the raw water tank specification and the water pipe specification, thereby realizing cost reduction.

  In the water purification treatment control of FIGS. 2 and 3, a reference tap water concentration Cw having a known value is input and set as the reference concentration of tap water. However, the raw water sensor is used even when using tap water without performing the input setting. The reference tap water concentration may be set by the reference value setting process based on the measurement result of 5.

  FIG. 6 shows a water purification treatment control flow when the reference tap water concentration is set by the reference value setting processing based on the measurement result of the raw water sensor 5. In this water purification process control flow, the setting process of the reference concentration C0 is performed in the same way as when using the tap water even when using tap water. Therefore, compared to the water purification process control flow of FIGS. The same processing is performed except ST5 and steps ST15 to ST21. In the water purification process control of FIG. 6, steps ST60 to ST62 from the initial setting to the raw water switching correspond to the steps ST1 to ST3. Moreover, the reference concentration setting process (steps ST64 to ST67) after the start of the water purification process corresponds to steps ST6 to ST9. That is, the tap water concentration is measured by the raw water sensor 5 (step ST64), the reference concentration C0 is obtained from the earliest raw water concentration C1, and the reference concentration C0 is set and stored instead of the reference tap water concentration (step ST65). -ST67). In the same way, when using tap water, as in the case of using stored water, purified water is supplied while monitoring changes in the impurity concentration of tap water based on the reference concentration C0, and when the purified water concentration exceeds the reference concentration, the water supply is supplied. Abnormality and RO membrane replacement are reported abnormally (steps ST69 to ST72).

FIG. 4 shows water intake control in the water purification system according to this embodiment.
Water intake from the water purification tank 26 is performed in a state where water purification treatment is possible. In the state where the pretreatment of the water purification treatment is not finished, that is, when an alarm is generated during replacement of activated carbon, RO membrane, or raw water, a water intake stop is notified (steps ST50 and ST56). In addition, when the supply of purified water to the purified water tank 26 is poor, that is, when the water pump 4 is driven poorly, the amount of stored purified water in the purified water tank 26 is monitored by the liquid level sensor 32 and the upper limit position LH and the lower limit. Even when the filling is not properly performed between the positions LL, the intake stop is notified (steps ST51 and ST56).

  Intake stop notification is not performed, the pretreatment is completed, and there is no supply failure of purified water to the purified water tank 26 (steps ST50 and ST51), and the intake mode can be set (step ST52). ). A key-in for instructing the start of water intake is performed by the input means 50, and a distinction is made between hot water and cold water (step ST53). When hot water is selected, only the electromagnetic valve 37 is opened, and the heated purified water can be discharged via the hot tank 34 (step ST54). When cold water is selected, only the solenoid valve 40 is opened to allow the purified water in the purified water tank 26 to be discharged (step ST55).

  In the normal clean water use state set in the water intake mode, a monitoring process (see steps ST32 to ST34 and ST37 to ST41 described later) for holding the amount of water stored in the water purification tank 26 by the liquid level sensor 32 is performed. Regardless of the water intake mode setting, the monitoring process of the water storage amount may be forcibly performed during the water purification process.

  Although the purified water in the water purification tank 26 is highly purified by the reverse osmosis action of the RO membrane, it removes all the sterilizing components contained in the raw water such as hypochlorous acid in tap water. There is no guarantee that bacteria and mold will not propagate. Therefore, in this embodiment, the ultraviolet sterilization lamp 31 is put into the water purification tank 26 to sterilize the purified water 29.

  If the ultraviolet germicidal lamp 31 is always lit and used, its consumption is accelerated and the equipment cost increases. Therefore, in this embodiment, a power saving control system for the ultraviolet germicidal lamp 31 is introduced.

FIG. 5 shows the monitoring process of the water storage amount retention and the purified water sterilization process in this embodiment.
The monitoring process of water storage amount retention and the purified water sterilization process control are executed in the purified water processable state set in the water intake mode (step ST31). In the state where the water purification treatment is possible, the water purification treatment is performed, and water is supplied to the water purification tank 26 by the water supply pump. When the liquid level sensor 32 detects that a predetermined amount of purified water is stored up to the upper limit position LH, a detection signal S2 to that effect is output (step ST32). Upon reception of the detection signal S2 for LH detection, the control circuit unit 41 stops driving the water pump 4 with the control signal S4 (step ST33). When water supply to the water purification tank 26 is stopped by stopping the water supply pump 4, a water supply stop timer (not shown) for monitoring the water supply stop state is started (step ST34). This water supply stop timer is built in the control circuit unit 41. Thus, since the purified water in the purified water tank 26 is maintained at a constant water level by monitoring the purified water amount by the liquid level sensor 32 and intermittent driving of the water pump 4, always secure the purified water amount necessary for water intake. I can leave.

  The control circuit unit 41 turns on the ultraviolet germicidal lamp 31 by the control signal S1 in a water storage state in which a predetermined amount of purified water in the tank is stored at the water level between the upper limit position LH and the lower limit position LL (step ST38). Therefore, until the water pump 4 is stopped (step ST33), the ultraviolet germicidal lamp 31 is kept on, and the sterilization process is sufficiently performed. When running water or sufficiently new purified water is supplied to the water purification tank 26, the propagation of bacteria and mold does not proceed in the tank, and the propagation proceeds when left in a stagnant state for a long time. After irradiation, it is preferable to maintain the life by turning off the light for power saving. Therefore, when one hour has passed after the water pump 4 is stopped, the ultraviolet germicidal lamp 31 is turned off (steps ST35 and ST36).

  From the state where the water is stored up to the upper limit position LH, the liquid level gradually decreases by using purified water. When the liquid level sensor 32 detects that the amount of stored water has decreased to the lower limit position LL, a detection signal S2 to that effect is output (step ST37). At this time, prior to re-driving the water pump 4, the ultraviolet germicidal lamp 31 is turned on (step ST38). Since the purified water supply is not in time for some reason and there is a possibility that the water retention will be prolonged with a small amount of stored water, the ultraviolet germicidal lamp 31 is turned on. After this lighting, a water supply start timer (not shown) is started, and when the timer counts 1 minute (step ST39), the control circuit unit 41 drives the water supply pump 4 by the control signal S4 (step ST40). The water supply start timer is built in the control circuit unit 41. The water supply stop timer is reset by the start of driving of the water supply pump 4 (step ST41).

  In the water-purifying process possible state set in the water intake mode, the monitoring process of the water storage amount retention and the water purification sterilization process are controlled in steps ST32 to ST41. However, for example, when the store is closed in a store or the like, the water intake mode is changed to the operation stop mode, and the water supply is stopped. At this time, the monitoring process for holding the stored water amount is not executed, and the purified water sterilization process (steps ST42 to ST46) in the operation stop mode is executed. Of course, when the water intake mode is canceled due to a failure of the water pump 4 or the like and the operation stop mode is entered, the water purification sterilization process (steps ST42 to ST46) is executed.

In the purified water sterilization process, monitoring by the water supply stop timer is performed (step ST42). In the water storage state in which a predetermined amount of purified water in the tank is stored at the water level between the upper limit position LH and the lower limit position LL, as described above, the ultraviolet germicidal lamp 31 is turned off after one hour has elapsed after the water pump 4 is stopped. (Steps ST33 to ST36). At this time, the water supply stop timer is started (step ST34), and it is determined whether or not the measured time has elapsed for 7 hours (step ST43). If the stagnant condition exceeds 7 hours, there is a strong possibility that the breeding of germs will start. At this point, the water supply stop timer is reset and the UV germicidal lamp 31 is turned on for 1 hour to prevent the propagation of germs. (Steps ST44 and ST45). After lighting for 1 hour, the ultraviolet germicidal lamp 31 is turned off, the water supply stop timer is restarted, and monitoring is continued for 7 hours (steps ST46 and ST42).

  According to the purified water sterilization treatment control, the ultraviolet germicidal lamp 31 is turned on when the water pump 4 is driven to store a predetermined amount or more of purified water in the purified water tank 26, and is sufficiently in the purified water tank 26. Since the water supply pump 4 is stopped after the water supply pump 4 is stopped after a predetermined time has elapsed, the life of the ultraviolet germicidal lamp 31 can be extended by switching on / off according to the water storage state instead of always lighting. Power consumption can be reduced by reducing power consumption.

  It should be noted that the present invention is not limited to the above-described embodiment, and various modifications, design changes and the like within the scope not departing from the technical idea of the present invention are included in the technical scope. Nor.

  According to the present invention, not only stored water in the raw water tank, but also purified water can be obtained by switching to tap water and supplying raw water, and depending on the usage status of the stored water or tap water in the raw water tank It is possible to provide a switchable RO water purifier capable of performing a high-quality water purification process by notifying abnormality and accurately informing the maintenance time such as raw water exchange or RO membrane inspection.

DESCRIPTION OF SYMBOLS 1 Raw water tank 2 Raw water 3 Raw water supply pipe 3A Tank water supply pipe 3B Tap water supply pipe 3C Electromagnetic three-way valve 3D Water supply valve 3E Water pipe 4 Water pump 5 Raw water sensor 6 Water supply end 7 Activated carbon tank 8 Activated carbon tank 9 RO membrane device 10 Activated carbon Tank 11 Connection pipe 12 Connection pipe 13 Three-way valve 14 Outlet side flow path 15 Connection pipe 16 Three-way valve 17 Outlet side flow path 18 Connection pipe 19 Flow rate adjustment flow path 20 Bypass flow path 21 Solenoid valve 22 Flow rate adjuster 23 Concentrated water return pipe 23A Electromagnetic three-way valve 23B Drain pipe 24 Purified water supply pipe 25 Purified sensor 26 Purified tank 27 Float valve 28 Float 29 Purified water 30 Open / close valve 31 UV germicidal lamp 32 Liquid level sensor 33 Intake pipe 34 Hot tank 35 Hot water pipe 36 Open / close valve 37 Solenoid valve 38 Faucet 39 Drain pipe 40 Solenoid valve 41 Control circuit section 42 Intake pipe 43 Drain pipe 44 Drain pipe 45 Upper lid 46 Program memory 48 Work memory 48 Alarm 49 Display 50 Input means 51 Raw water selector switch S1 Control signal S2 Detection signal S3 Measurement signal S4 Drive signal S5 Open / close signal S6 Open / close signal S7 Open / close signal S8 Measurement signal S9 Drive signal S10 Drive signal W Water supply water

Claims (11)

A raw water supply pipe that supplies raw water from a raw water supply section with a water pump, a raw water sensor that measures an impurity concentration of the raw water flowing through the raw water supply pipe, and the raw water that is passed through the raw water supply pipe A purification filter unit including at least an RO (Reverse Osmosis) membrane that removes impurities and generates purified water; a purified water tank that stores the purified water;
A purified water supply pipe that supplies purified water from the purification filter section to the purified water tank, and a purified water supply section that supplies the required amount of purified water from the purified water tank, and selects a raw water tank or a water pipe as the raw water supply section And an abnormality notification means for notifying abnormalities when the raw water sensor measures an abnormal raw water concentration with respect to the water stored in the raw water tank or tap water from the water pipe according to the switching setting of the changeover switch. A switching type RO water purifier characterized by comprising: When supplying raw water from the raw water tank through the raw water supply pipe, when supplying raw water from the water pipe through the raw water supply pipe, and a concentrated water return pipe for returning the concentrated water generated by the purification action of the RO membrane to the raw water tank. The switchable RO water purifier according to claim 1, further comprising a drain pipe for draining concentrated water generated by the purification action of the RO membrane. A purified water sensor for measuring an impurity concentration of the purified water flowing through the purified water supply pipe, and a concentration of the first raw water concentration first measured by the raw water sensor after the raw water supply of the stored water or the tap water is started The first raw water concentration storage means, the purified water concentration storage means for storing the purified water concentration continuously measured by the water purification sensor, and the comparison means for comparing the purified water concentration with the reference concentration calculated from the first raw water concentration. And the abnormal notification means notifies the replacement of the stored water, the supply abnormality of the tap water, or the replacement of the RO membrane, assuming that the abnormal raw water concentration has reached when the purified water concentration becomes larger than the reference concentration. The switching type RO water purifier according to claim 1 or 2. A purified water sensor that measures the impurity concentration of the purified water that circulates through the purified water supply pipe, and when the raw water tank is supplied from the raw water tank by switching to the raw water tank by the changeover switch, the raw water sensor first measures A first reference raw water concentration storage means for storing the first raw water concentration, and when the tap water is supplied from the water pipe by switching to the water pipe by the changeover switch, a predetermined reference tap water concentration is stored. Reference tap water concentration storage means, purified water concentration storage means for storing the purified water concentration continuously measured by the purified water sensor, reference concentration obtained from the earliest raw water concentration when the stored water is supplied to the raw water, and the purified water Comparing means for comparing concentrations or comparing the reference tap water concentration with the purified water concentration when the tap water is supplied as raw water, the abnormality notification means The raw water tank use abnormality notification means for notifying the replacement of the raw water and / or the replacement of the RO membrane on the condition that the purified water concentration is higher than the reference concentration, and the purified water concentration is more than the reference tap water concentration The switchable RO water purifier according to claim 1 or 2, further comprising a tap water use abnormality notifying means for notifying the supply abnormality of the tap water and / or the replacement of the RO membrane on the condition that it has become larger. The switchable RO water purifier according to claim 3, further comprising a water supply stopping unit that stops water supply of the water supply pump when the purified water concentration exceeds the abnormal raw water concentration. The switching type RO water purifier according to claim 4, further comprising a water supply stop unit that stops water supply of the water pump when the purified water concentration exceeds the reference concentration or the reference tap water concentration. When the raw water is supplied from the raw water tank by the switching setting of the changeover switch, the raw water sensor includes an empty notification means for detecting and notifying that the raw water tank is empty. 6. The switching type RO water purifier according to any one of 6 above. The concentrated water return pipe includes a flow rate adjusting flow path that maintains the osmotic pressure of the RO membrane at a predetermined value, and an openable / closable bypass flow path that is provided alongside the flow rate adjusting flow path. The switchable RO water purifier according to any one of claims 2 to 7, wherein the bypass flow path is opened. The switchable RO water purifier according to any one of claims 1 to 8, wherein the raw water sensor is a sensor that measures all soluble substances dissolved in water. The switched-type RO water purifier according to any one of claims 3 to 8, wherein the water purification sensor comprises a sensor that measures all soluble substances dissolved in water. The activated carbon treatment part which passes the activated carbon tank and purifies the raw water through at least the raw water introduction side flow path of the purification filter part, and passes the raw water that has passed through the activated carbon tank to the RO membrane. The switching type RO water purifier according to any one of 10.

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