JP3777376B2 - Water purifier and control method thereof - Google Patents

Description

  The present invention relates to a water purification apparatus that supplies purified water generated by treating raw water and a control method thereof, and more particularly, to a water purification apparatus that provides high-quality water using a reverse osmosis membrane.

  In recent years, interest in health and the environment has increased, and research and development of water treatment systems for producing purified water and pure water have progressed. A water treatment system is a system that obtains high-purity water by removing impurities from raw water or well water under the Water Supply Law, and obtains high-purity water. Drinking water in the event of water shortage or disaster Indispensable for supply systems.

  In particular, water treatment systems that use reverse osmosis membranes (also called reverse osmosis, R · O) as a means to remove impurities from raw water are medical facilities, food processing facilities, and semiconductor cleaning plants. High demand is gained in facilities that require advanced hygiene management. This reverse osmosis membrane is an artificial semipermeable membrane having ultrafine pores of 0.0001 to 0.0005 microns and can selectively permeate only water molecules. Therefore, even very fine impurities such as dioxins, heavy metals and viruses contained in raw water can be removed with a high removal rate, and extremely safe pure water can be produced.

  On the other hand, a water treatment system using a reverse osmosis membrane as described above has a reverse osmosis membrane that clogs ultra-fine pores provided on the membrane surface in a short time due to substances to be separated and removed. It has been conventionally known that the following problems exist together with problems derived from the structure itself.

  In other words, a water treatment system using a reverse osmosis membrane applies water to the raw water aqueous solution to remove water (hereinafter referred to as permeate) from which most of the inorganic or organic matter has been removed by the separation ability of the membrane. Is used for the purpose of separation into concentrated water (hereinafter referred to as “concentrated water”), but this treatment can be realized only when the raw aqueous solution is pressurized against the membrane. However, the water treatment system does not always operate continuously, and may stop depending on the situation. Naturally, the pressurization inside and outside the membrane is released by this stop. In this case, the pressure difference between the inside and outside of the membrane becomes 0, and a substance having a relatively small molecular weight moves between the permeated water and the concentrated water separated in a pressurized state. This is a phenomenon called RO creep. After the operation of the water treatment apparatus is stopped, the quality of the permeated water decreases with the passage of time, and the quality of the water supplied immediately after the resumption of operation is extremely deteriorated.

  This phenomenon has been confirmed for several decades, but the technology called reverse osmosis membrane was basically used for continuous operation and processing such as seawater desalination plants. It was rarely taken up as a problem. That is, in such a process, even after the equipment is once stopped, all the water existing in the membrane has to be drained only at the initial stage when the operation is resumed, and there is little need to take measures against RO creep.

  The RO creep in the reverse osmosis membrane water treatment system was regarded as a problem, and technical innovations were forced to occur because of the intermittent operation of the reverse osmosis membrane water treatment device that was constantly operated and stopped. When it is necessary. This is the time when the applicant adopted the reverse osmosis membrane water treatment system in the form of a water vending machine for the first time in Japan. At this time, the applicant When tap water (or water equivalent to it) is cooked and sold, the raw water taken into the machine must be cooked each time by the cooker in the equipment. " Was structurally obligatory.

  In other words, when a conventional water treatment system is applied to this water vending machine, it is defined as “cooking” that raw water passes through the water treatment device, and the water treatment device itself is defined as a “cooker”. It was forbidden to pre-cook raw water, store permeate and sell it for sale, and a small amount of “cooking” was only a few liters. The reverse osmosis membrane that must be stopped is required to have a very unfavorable operating condition, so the big problem that the water quality of the water prepared and supplied by this intermittent operation is reduced by RO creep has become apparent. It was.

  Therefore, in water vending machines using a reverse osmosis membrane water treatment system, in order to suppress this RO creep phenomenon, the equipment is restarted even when the equipment that does not inject water is stopped or in standby. In addition, a technique has been proposed in which the permeated water staying inside the apparatus is intermittently repeated and the permeated water staying inside the apparatus is circulated to prevent deterioration of the permeated water quality (for example, see Patent Document 1 below).

  In this prior art, the following circulation control method is disclosed. That is, (1) The raw water is permeated through the reverse osmosis membrane, separated into permeated water and concentrated water, and this permeated water is poured, and these water are mixed again when the apparatus is stopped, and the reverse osmosis membrane is taken up. In this method, the pipe is retransmitted to the side or mixed after the pipe is retransmitted, and the mixed water permeates the reverse osmosis membrane. (2) In addition, based on the above method, in order to prevent the concentration of concentrated water in the circulating water from increasing, the separated concentrated water is drained little by little, and the raw water is supplied accordingly. .

In this way, the control method of draining concentrated water as it is, re-pumping the pipe to the reverse osmosis membrane inlet side, retransmitting it, increasing the linear flow rate, and securing water that permeates the reverse osmosis membrane is performed better than before. Technology. The RO creep measures have been taken by increasing the amount of permeated water supplied by this technique or by washing away substances that are likely to adhere to and adhere to the membrane surface.
JP 2002-126733 A

  However, in the above method (1), after the raw water is permeated and separated during the operation of the apparatus, the mixed water in which the permeated water and the concentrated water are mixed is circulated again and again even when the apparatus is stopped. According to this method, the reverse osmosis membrane is in a state in which pressure is repeatedly applied not only during operation but also when it is stopped. However, it was clear that the deterioration of the reverse osmosis membrane progressed at a speed nearly twice that of the case where it was used only during operation, and the life of the membrane itself was extremely shortened.

  In order to permeate the reverse osmosis membrane, it is necessary to operate a dedicated pressurizing pump. However, due to the nature of the pump, repeated ON-OFF damages each part greatly, and the life of the pump is greatly shortened. I will let you. In addition, the loss of electric energy in switching is large, and there is a problem in terms of cost. Furthermore, due to this intermittent operation, the water temperature rises due to the operation of the pump, so that the deterioration of the reverse osmosis membrane, which is generally considered to be weak against heat, has further progressed, and the lifetime has been further shortened. .

  In the above method (2), it is possible to suppress the rise in water temperature due to the inflow of some raw water, but on the other hand, the concentrated water is always drained, and the raw water is consumed wastefully. It was not an advantageous method. In addition, the raw water supplied in place of the concentrated water that is partially drained is essentially “water to be separated” that contains enough organic and inorganic substances. As a result, the reverse osmosis membrane is repeatedly permeated and used. In fact, as described above, it was clear that the lifetime of the film was shortened.

  The present invention has been proposed in order to solve such problems of the prior art. The purpose of the present invention is to provide a plurality of water purification means using reverse osmosis membranes, and as a countermeasure against RO creep, An object of the present invention is to provide a water purifier capable of supplying permeated water of high quality, realizing a long life of a reverse osmosis membrane, and causing no loss of electric energy and wasteful drainage, and a control method thereof.

In order to achieve the above object, according to the first aspect of the present invention, permeated water and concentrated water are separated and generated from raw water by a water purifying means having a reverse osmosis membrane in a flow path, and the permeated water from the raw water is supplied from a water inlet. In the control method of the water purifier for supplying a predetermined amount, the water purifying means is provided in parallel, raw water is taken into the at least one water purifying means, and the permeated water that has permeated the reverse osmosis membrane in the water purifying means is from the water injection port. After the predetermined amount is supplied, the permeated water is supplied from the one water purifying means to the raw water side of the reverse osmosis membrane in the other water purifying means in a standby state, and the one water purifying means has the permeated water as described above. The operation is stopped after the inside and outside of the reverse osmosis membrane in the other water purification means is filled, and the other water purification means starts operation at the time of re-operation .

The invention described in claim 3 captures the invention of claim 1 from the viewpoint of the apparatus, and separates and generates permeate and concentrated water from raw water by water purification means having a reverse osmosis membrane in the flow path, In the water purification apparatus for supplying permeated water from the water inlet , a plurality of the water purification means are provided in parallel, and each of the water purification means includes the reverse osmosis membrane, and a raw water flow path for taking raw water into the reverse osmosis membrane, A permeated water channel for sending the permeated water and a concentrated water channel for discharging the concentrated water are provided, respectively. The permeated water channel includes a supply channel for supplying the permeated water to the outside, and the permeated water. A recirculation flow path that supplies the raw water side of the reverse osmosis membrane in the water purification means, and a pressure pump that supplies the raw water to each of the water purification means is provided, the raw water flow path, the concentrated water flow path, the supply flow The passage and the circulation channel are provided with on-off valves, The raw water is taken into at least one water purification means, and after a predetermined amount of permeated water that has passed through the reverse osmosis membrane in the water purification means is supplied from the water injection port, the reverse osmosis membrane in the other water purification means in the standby state The permeated water is supplied from the one water purification means to the raw water side, and the one water purification means stops operation after the permeated water is filled inside and outside the reverse osmosis membrane in the other water purification means, and restarts. Sometimes, it has a control device for controlling the pressurizing pump and the on-off valve so that the other water purification means starts operation .

  In the invention according to claim 1 or 3 as described above, a plurality of water purifying means having reverse osmosis membranes are provided in parallel, and the permeated water that has passed through one water purifying means is supplied to other water purifying means waiting, In the state of the reverse osmosis membrane in the water purification means of the conventional osmosis, the operation of the pump is stopped in a state where the permeated water has accumulated inside and outside, and at the time of restart, the operation is resumed from the other water purification means in which the permeated water has accumulated. Thus, even if the pump is not operated intermittently, high quality permeated water can always be supplied.

  Further, since it is not necessary to operate the pump intermittently or continuously, power consumption can be reduced. Furthermore, since the water does not permeate the reverse osmosis membrane of one water purifying means several times during standby of the device, it is possible to prevent the life of the membrane itself from being shortened. Furthermore, since only permeate is circulated by sending only permeate to the intake side of the reverse osmosis membrane in other water purification means, there is no case where the concentration of circulating water becomes high.

The invention according to claim 2 is the invention according to claim 1 , before the permeated water is supplied from the one water purification means to the raw water side of the reverse osmosis membrane in the other water purification means in the standby state, The concentrated water is supplied from the one water purification means to the raw water side of the reverse osmosis membrane in the other water purification means .

Invention of Claim 4 caught invention of Claim 2 from a viewpoint of an apparatus, In invention of Claim 3, the said concentrated water flow path is a drainage flow path which sends the said concentrated water to a drainage tank, and And a concentrated water circulation channel for supplying the concentrated water to the raw water side of the reverse osmosis membrane in the other water purification means .

  According to the invention of claim 2 or 4 as described above, when one water purifying means is in operation, the concentrated water is sent to another water purifying means that is in a standby state, so that it adheres to the membrane surface that is on standby. Substances that are likely to stick can be washed away. That is, in this state, the concentrated water is allowed to pass through to the drainage side without passing through the membrane, so that the preparatory operation for the next operation is performed without imposing an extra burden on the membrane itself, which is extremely effective. Become operational.

  In this way, as a first stage of water supply preparation in the standby water purification means, the concentrated drainage of the operating system is used, and only the outside of the membrane is washed to adhere or adhere to the standby reverse osmosis membrane. The material is washed off, and in the second stage, only the permeate from the system in operation is sent to the inside and outside of the membrane to finish washing off the outer surface of the membrane, and the permeated water staying at the center of the membrane is also replaced. Therefore, the preparation for the next operation is complete.

  As described above, according to the present invention, by providing a plurality of water purifying means using reverse osmosis membranes, it is possible to supply permeated water of extremely high quality including RO creep countermeasures, and a long life of reverse osmosis membranes. Therefore, it is possible to provide a water purifier and a control method therefor that do not cause loss of electrical energy and wasteful drainage.

  The best mode for carrying out the present invention (hereinafter referred to as an embodiment) will be specifically described with reference to the drawings. In this embodiment, the water treatment system using the reverse osmosis membrane of the present invention is applied to a vending machine, and is a system that constantly supplies high-quality water with the following configuration, operation, and effect. .

  In addition, the present invention, on the structure of the reverse osmosis membrane filtration system, requires a sufficient pressure in the operation situation, while in the static pressure situation, the structural defect of the movement of a substance with a small molecular weight inside and outside the membrane was compensated, In other words, it is an invention dedicated to a reverse osmosis membrane system, and even a person skilled in the art of filtration systems cannot easily come up with various conventional techniques. For example, although it is not a RO reverse osmosis membrane filtration method, there is a method of operating two parallel ion exchange tubes mutually as a method for suppressing the growth of microorganisms and bacteria, which is a drawback of the ion exchange method (special Kaihei 9-94562). However, this conventional technique is a method for the purpose of sterilizing the staying water in the ion exchange cylinder that is stopped, and is completely different from the present invention in terms of purpose, structure, and contents to be improved. . As described later, the present invention divides the system into two systems, and at the end of one operation, the preparation for the next operation start is completed for the other one, but this relates to the pressure in the system. As a countermeasure against RO creep, this is an epoch-making method of enclosing permeated water on both the inside and outside of the RO membrane, and is an excellent invention that is essentially different from the above-mentioned conventional technology.

[1. Constitution〕
First, the configuration of the present embodiment will be described. In this embodiment, a water vending machine (hereinafter referred to as “book”) that separates and generates raw water into permeated water and concentrated water by a reverse osmosis membrane provided in the flow path, and supplies the generated permeated water to a container for sale. And a control method thereof. As shown in the functional block diagram of FIG. 1, this machine mainly includes a pressure pump P disposed in a water supply flow path to a plurality of reverse osmosis membranes RO (here, two series), and each flow path. The pressure pump P, each on-off valve SV, and the like are controlled in operation or on-off by a control device (not shown). This machine is configured to constantly generate a liquid flow for the reverse osmosis membrane by controlling the operation of such a pressure pump P or an on-off valve SV, which is an electromagnetic valve, by a control device.

  More specifically, as shown in FIG. 1, a raw water supply valve SV1 for supplying or blocking raw water to a flow path for supplying raw water such as tap water, and the reverse for generating permeated water and concentrated water from the raw water. A pressure pump P that feeds raw water to the osmotic membrane RO side, and is further divided into two systems at the source of the raw water, and each system includes a first reverse osmosis membrane RO1 and a second reverse osmosis membrane RO2. On the intake side, on-off valves SV21 and SV22 are provided. Hereinafter, a system including the first reverse osmosis membrane RO1 will be described as a first system, and a system including the second reverse osmosis membrane RO2 will be described as a second system.

  Permeate outlets 11 and 12 and concentrated water outlets 13 and 14 are provided on the outlet side of the reverse osmosis membranes RO1 and RO2, respectively. The permeated water outlets 11 and 12 are provided with permeated water supply pipes 15 and 16, and the permeated water supply pipes 15 and 16 include permeated water supply paths 15 a and 16 a for supplying permeated water to the bottles, and It consists of permeated water circulation paths 15b and 16b for circulating the permeated water that has passed through the membrane to the water intake side of the reverse osmosis membrane. The permeate water supply paths 15a and 16a are provided with permeate water supply valves SV41 and SV42, and the permeate water circulation paths 15b and 16b are provided with permeate water circulation valves SV51 and SV52. The concentrated water outlets 13 and 14 are provided with concentrated water discharge passages 17 and 18 for draining the concentrated water to a drain tank, and are also provided with concentrated water discharge valves SV31 and SV32.

  Although not shown, the water inlet S in this machine has a mounting part for mounting a bottle B for water, a door for protecting the mounting part, a lock mechanism for locking the door except for a predetermined place, Various operation button switches are provided. The operation button switch is configured so that a plurality of buttons having different water supply amounts are prepared and the user can select a desired water supply amount.

[2. Action)
Next, the operation of the water vending machine in the present embodiment configured as described above will be described. The machine generally operates in the following procedure. That is, when the user inserts a coin or the like into the machine, sets the brought bottle B in the mounting portion of the water inlet S, and presses a predetermined operation button switch that requests water supply (hereinafter referred to as “water supply by the user”). The raw water is supplied to the first system by the action of a control device (not shown). And when the supply to this system is completed, only the permeated water obtained from the first system is supplied to the second system for a short time, and all the inside and outside of the reverse osmosis membrane RO2 in the second system are supplied. Is filled with permeated water, and then the system is temporarily stopped.

  Next, when the machine is restarted, the second system in which the inside and outside of the reverse osmosis membrane RO2 are filled with permeated water first starts to operate. For this reason, high quality permeated water can be obtained immediately after re-operation. Thereafter, when reverse osmosis membranes RO composed of a plurality of systems (two systems in this embodiment) are alternately operated and the system is temporarily stopped, the inside and outside of the other reverse osmosis membranes RO are filled with permeated water and then stopped. . Accordingly, in any case, when the system is restarted, the system in which the inside and outside of the reverse osmosis membrane RO are filled with permeated water is restarted, so that high-quality water can always be supplied.

Hereinafter, a more specific operation will be described with reference to FIG.
(1) At the time of water collection When a water supply instruction is given by the user, water supply to the first system is started. That is, the raw water supply valve SV1, the first system-side on-off valve SV21, the concentrated water drain valve SV31, and the permeated water supply valve SV41 are opened by the action of a control device (not shown). Further, the pressurization pump P is operated, and the raw water is permeated through the reverse osmosis membrane RO1 with a predetermined pressure, so that the permeated water and the concentrated water are separated. The permeated water passes through the permeated water supply path 15a. The concentrated water is supplied to the bottle (container) and flows into the drainage tank T through the concentrated water discharge path 17.

(2) When bottle is full (RO creep timer starts)
When a fixed amount of permeated water is supplied to bottle B by the quantitative supply by the action of the permeate supply valve SV41 and the bottle B is full, the control device operates to open and close the raw water supply valve SV1 and the first system side. While the valve SV21 and the concentrated water discharge valve SV31 are kept open, the permeate supply valve SV41 is closed, and instead, the permeate circulation disposed on the permeate outlet 11 side of the first reverse osmosis membrane RO1. The concentrated water discharge valve SV31 provided on the concentrated water outlet 13 side of the valve SV51 and the second reverse osmosis membrane RO2 is opened. In this state, the pressurizing pump P continues to operate, and the permeate permeated by the first reverse osmosis membrane RO1 is supplied to the second system through the permeate circulation path 15b. This supply is continued until all the inside and outside of the second reverse osmosis membrane RO2 is filled with permeated water in the second system.

(3) At the end of sampling (standby mode)
Next, when the inside and outside of the second reverse osmosis membrane RO2 are filled with permeated water, the pressurizing pump P stops operating, the raw water supply valve SV1 is closed, and all the other on-off valves are closed accordingly. The unit enters the standby state.

(4) At the time of re-watering Next, the time of re-operation will be described. As in the case described above, when a water supply instruction is given by the user, the second system filled with permeated water inside and outside this time will operate. That is, the raw water supply valve SV1, the on-off valve SV22, the permeated water supply valve SV42 and the concentrated water discharge valve SV32 are opened, and the pressurization pump P resumes its operation. In the second system, the above (1) The permeate sampling similar to that shown is started.

(5) When the bottle is full again (RO creep timer starts operating)
When a certain amount of permeated water is supplied to the bottle by the action of the permeated water supply valve SV42 and the bottle is full, the control device controls the raw water supply valve SV1, the second system-side on-off valve SV22, and the concentrated water drain valve SV32. The permeated water supply valve SV42 is closed while the open state is maintained, and instead of the permeated water circulation valve SV52 and the first reverse osmosis membrane RO1 disposed on the outlet side of the second reverse osmosis membrane RO2. The concentrated water discharge valve SV31 provided on the concentrated water outlet 13 side is opened. During this time, the pressurizing pump P continues to operate, and the operation is continued until the permeated water is supplied to a system other than the currently operating system, that is, the first system, and all the inside and outside of the first reverse osmosis membrane RO are filled with the permeated water. continue.

(6) When re-watering ends (standby mode)
When all of the first reverse osmosis membranes RO1 are filled with permeated water, the pressurization pump P stops and all the other on-off valves are closed as the raw water supply valve SV1 is closed.

[3. effect〕
According to the water vending machine in the present embodiment that operates as described above, conventionally, the water vending machine is simply used to eliminate the RO creep in a state where there is no water supply instruction by the user, that is, in a stop or standby state of the device. In addition, it is not necessary to circulate the mixed water of the permeated water and the concentrated water continuously or intermittently. Thereby, this embodiment has the following effects.

(1) Useless power consumption is eliminated.
That is, in the conventional vending machine, in the standby state of the equipment, it was necessary to operate a dedicated pressure pump and circulate the mixed water intermittently. In such a case, due to the nature of the pump, Repeating ON / OFF of the switch also causes a large loss of electric energy and has a problem in terms of cost. However, in this embodiment, water supply to the other system is continued even after the water supply process is completed, and the operation of the pressure pump P is stopped in a state where the permeated water has accumulated inside and outside the reverse osmosis membrane RO in the other system. Therefore, there is no need to operate the pump intermittently, and power consumption is reduced.

(2) Useless waste water is eliminated.
Further, in the prior art, only the separated concentrated water is drained little by little and the raw water is supplied in order to prevent the concentrated water concentration of the circulating water from becoming high. Since only this permeated water is circulated to the intake side of the reverse osmosis membrane RO of another system, there is no case where the concentration of the circulating water becomes high. Therefore, unlike the prior art, there is no need to drain concentrated water and supply raw water, and there is no wasted water.

(3) It is possible to prevent the shortening of the film life due to repeated permeation of the film.
Further, in this embodiment, two lines having a reverse osmosis membrane are prepared, and when the water supply is stopped after the operation of one system, the permeate is sent to other systems. The mixed water is never permeated through the osmotic membrane RO, and the lifetime of the membrane itself can be prevented from being shortened.

(4) Pump consumption and repeated life can be prevented by repeated use.
Similarly to the above, due to the nature of the pump, repeating the ON / OFF of the switch consumes the function of the pump, shortens the service life, and causes extreme partial consumption. However, in this embodiment, it is possible to apply a load to the pump by preparing two systems having a reverse osmosis membrane RO and circulating the permeate to other systems when water supply is stopped after the operation of one system. Therefore, the life of the pump can be increased.

  As described above, in the prior art, since the entire device including the solenoid valve is used continuously and intermittently, the life of the entire device is gradually shortened. However, according to the above-described embodiment, two systems having a reverse osmosis membrane are prepared, and when the water supply is stopped after the operation of one system, the permeate is circulated to other systems. There is little load on the equipment, and the life of the whole equipment can be extended, so the benefits are immeasurable.

Other Embodiment
In addition, this invention is not limited to the said embodiment, Other embodiments which are illustrated next are included. That is, in a normal operation state, for example, while the first system is operating, the permeated water is supplied to the bottle B through the permeated water supply pipe 15, while the concentrated water is drained through the concentrated water discharge path 17. However, before the equipment is stopped or in a standby state, that is, before the water supply to the bottle B is stopped, the permeated water is continuously supplied, and the concentrated water is sent to the second system without draining. It is also possible to configure.

  Specifically, as shown in FIG. 2, on the concentrated water outlet 13 side of the first reverse osmosis membrane RO1, a concentrated water circulation path 17b including a concentrated water circulation valve SV61 is provided in addition to the concentrated water discharge path 17a. ing. And this concentrated water circulation path 17b is attached to the intake side of the raw water of the reverse osmosis membrane in the second system, like the permeated water circulation path 15b. Similarly, in the second reverse osmosis membrane RO2, a concentrated water circulation path 18b having a concentrated water circulation valve SV62 is provided on the concentrated water outlet 14 side in addition to the concentrated water discharge path 18a. As with the permeate circulation path 16b, the reverse osmosis membrane RO1 in the first system is attached to the raw water intake side.

  In the embodiment having such a configuration, it operates between (1) when the bottle is sampled and (2) when the bottle is full as shown in the present embodiment. That is, at the time of bottle sampling as described in (1) above, the raw water supply valve SV1, the on-off valve SV21, the permeated water supply valve and the concentrated water discharge valve are open, but in this state the bottle is full. Before the predetermined time, the concentrated water discharge valve SV31 is closed by the control of a control device (not shown), the concentrated water circulation valve SV61 is opened, and the concentrated water discharge valve SV32 in the second system is opened. Then, the concentrated water is sent to the water intake side of the reverse osmosis membrane RO2 in the second system that is on standby. The concentrated water does not permeate the second reverse osmosis membrane, and contains a substance that is likely to adhere to or adhere to the membrane surface, passes through the concentrated water pipe, and stops in the drain tank.

  When the bottle B is full, the raw water supply valve SV1, the first system-side on-off valve SV2, and the concentrated water discharge valve SV32 provided on the concentrated water outlet 14 side of the second reverse osmosis membrane RO2 are opened. On the other hand, the permeated water supply valve SV41 and the concentrated water circulation valve SV61 are closed, and instead, the permeated water circulation valve SV51 disposed on the outlet side of the first reverse osmosis membrane is opened. And like the said embodiment, the action | operation of the pressurization pump P is continued and the permeate permeate | transmitted by 1st reverse osmosis membrane RO1 passes through the permeate circulation path 15b, and is supplied to a 2nd system | strain. . And this supply is continued until the inside and outside of 2nd reverse osmosis membrane RO2 are fully filled with permeated water in the 2nd system.

  According to the embodiment as described above, when the first system is in operation, the concentrated water is sent to the second system that is in a temporary standby state, so that it is likely to adhere to and adhere to the surface of the membrane that is on standby. The substance can be washed off. That is, in this state, the concentrated water is allowed to pass through to the drainage side without passing through the membrane, so that the preparatory operation for the next operation is performed without imposing an extra burden on the membrane itself, which is extremely effective. Become operational.

  In this way, as a first stage of water supply preparation in the standby system, the substance adhered to or adhered to the standby reverse osmosis membrane by washing only the outside of the membrane using the concentrated drainage of the operating system In the second stage, only the permeated water is sent to the inside and outside of the membrane to finish washing off the outer surface of the membrane, and the permeated water staying at the center of the membrane is also replaced. Therefore, the preparation for the next operation is complete.

  Further, in the above embodiment, when one system is in operation, the other system is in a standby state, but the present invention is not limited to such an embodiment. That is, during the operation of one system, the supply of raw water to the other system can be started and the two systems can be operated simultaneously.

  In this case, the quality of water that can be supplied as permeated water is not only the same as in the above embodiment, but the amount of permeated water, that is, the amount of water that can be supplied to the bottle, is the total amount of the two systems. Moreover, the system | strain which operate | moves simultaneously is not restricted to 2 systems | system | groups as the said embodiment, According to the objectives, such as the amount of water to supply, it can be comprised from several systems | systems, and also can combine them in combination. For example, the convenience increases.

  Further, in the case of operating in a combination of a plurality of systems as described above, when stopping or waiting for the equipment, the first system is first terminated first, while the second system is in the first system. Finish by filling with permeate sent from the system. Further, the third system is terminated by filling with the permeated water sent from the second system, and thereafter, the other system is sequentially terminated as the water supply preparation stage, and finally all the systems are in the water supply preparation stage. The device goes into hibernation mode.

  In the above-described embodiment, for the sake of convenience of description, the system including the reverse osmosis membrane is shown as a two-system configuration. However, the present invention is not limited to such a configuration and exhibits the above-described operation. As long as the number or combination of systems can be arbitrarily changed. For example, as shown in FIG. 3, the two systems shown in the present embodiment can be configured as one unit, and a plurality of such units can be provided. In the above embodiment, the first or second system and the order are provided. However, this is an order for convenience of explanation, and both systems originally have no order. Even if the device is operated from the above, the same effect can be obtained.

  Further, by using inverter control as the control device in the above embodiment, the operation immediately after the start of operation of the system and immediately before the end can be accelerated and decelerated step by step, resulting in a sudden start / stop of the entire device. It is also possible to avoid control system troubles. In other words, for each member such as pumps, pressure gauges, solenoid valves, etc., many burdens caused by repeated rapid acceleration / rapid stop, rapid pressurization / decompression are alleviated, and overall equipment consumption and consumption of each component are reduced. As a result, further economic efficiency will be created.

The functional block diagram which shows the structure of embodiment of this invention. The functional block diagram which shows the structure of other embodiment of this invention. The functional block diagram which shows the structure of other embodiment of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 11,12 ... Permeated water outlet 13,14 ... Concentrated water outlet 15,16 ... Permeated water supply piping 15a, 16a ... Permeated water supply channel 15b, 16b ... Permeated water circulation channel 17, 18 ... Concentrated water discharge channel 17b, 18b ... Concentration Water circulation path B ... Bottle P ... Pressure pump RO1, RO2 ... Reverse osmosis membrane S ... Water injection port SV1 ... Raw water supply valve SV21, SV22 ... Open / close valve SV31, SV32 ... Concentrated water discharge valve SV31, SV32 ... Concentrated water drain valve SV41, SV42 ... Permeated water supply valve SV51, SV52 ... Permeated water circulation valve SV61, SV62 ... Concentrated water circulation valve T ... Drain tank

Claims (4)

In the control method of the water purification apparatus, the permeated water and the concentrated water are separated from the raw water by the water purification means provided with the reverse osmosis membrane in the flow path, and a predetermined amount of the permeated water is supplied from the water inlet.
A plurality of the water purification means are provided in parallel,
The raw water is taken into the at least one water purification means, and after a predetermined amount of permeated water that has passed through the reverse osmosis membrane in the water purification means is supplied from the water inlet, the reverse osmosis membrane in the other water purification means in the standby state The permeated water is supplied from the one water purification means to the raw water side,
The one water purification means stops operation after the permeated water is filled inside and outside the reverse osmosis membrane in the other water purification means,
The control method of the water purification apparatus, wherein the other water purification means starts operation at the time of re-operation.   Before the permeate is supplied from the one water purification means to the raw water side of the reverse osmosis membrane in the other water purification means in the standby state, the one water supply is supplied to the raw water side of the reverse osmosis membrane in the other water purification means. The method for controlling a water purifier according to claim 1, wherein the concentrated water is supplied from two water purifying means. In a water purifier that separates and produces permeate and concentrated water from raw water by a water purifier equipped with a reverse osmosis membrane in the flow path, and supplies the permeate from the water inlet,
A plurality of the water purification means are provided in parallel,
Each of the water purification means is provided with the reverse osmosis membrane, a raw water flow channel for taking raw water into the reverse osmosis membrane, a permeate flow channel for sending the permeate, and a concentrated water flow channel for discharging the concentrated water, respectively. And
The permeate flow path includes a supply flow path for supplying the permeate to the outside, and a circulation flow path for supplying the permeate to the raw water side of the reverse osmosis membrane in other water purification means,
A pressure pump for supplying raw water to each of the water purification means is provided,
The raw water flow path, the concentrated water flow path, the supply flow path, and the circulation flow path are provided with on-off valves,
The raw water is taken into the at least one water purification means, and after a predetermined amount of permeated water that has passed through the reverse osmosis membrane in the water purification means is supplied from the water injection port, the reverse osmosis membrane in the other water purification means in the standby state The permeated water is supplied from the one water purification means to the raw water side, and the one water purification means stops operation after the permeated water is filled inside and outside the reverse osmosis membrane in the other water purification means, and restarts. Sometimes, the water purifier has a control device for controlling the pressurizing pump and the on-off valve so that the other water purifying means starts operation .   The concentrated water flow path comprises a drain flow path for sending the concentrated water to a drain tank, and a concentrated water circulation flow path for supplying the concentrated water to the raw water side of the reverse osmosis membrane in the other water purification means, The water purifier of Claim 3.

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