JPWO2014200010A1 - Switching valve used in water purification system and water purification system - Google Patents

Abstract

Provided are a water purification system that reduces the possibility of residual chlorine, microorganisms, red rust and the like mixed with purified water, and a faucet used in the water purification system. The water purifier comprises a filter connected to the raw water pipe, and a tank connected to the downstream side of the filter and storing the purified water or discharging the stored purified water according to the pressure of the purified water purified by the filter. A stopper is a water purification system provided with the purified water outlet which discharges the purified water purified with the filter, and the operation apparatus for switching the following purified water discharging state and drainage discharging state. 1) A purified water discharge state in which the purified water discharge port is connected to the purified water pipe and water is discharged from the purified water discharge port while storing purified water in the tank. 2) Close the purified water spout and connect the raw water pipe on the downstream side of the drain spout and the drain spout and connect the purified water stored in the tank through the filter and the raw water pipe. A drainage discharge state in which the wastewater is discharged toward the drainage spout and drained from the drainage spout.

Description

  The present invention relates to a water purification system and a switching valve used in such a water purification system.

  Conventionally, a so-called under-sink type water purification system in which a water purification device is disposed under a sink is known. In such an undersink type water purification system, a method is known in which impurities inside the filter are discharged by back washing to extend the life of the filter.

  FIG. 7 is a graph schematically showing the relationship between the instantaneous flow rate (L / min) of the PE membrane module and the integrated filtration flow rate (L). In FIG. 7, the sample 201 shows the relationship between the instantaneous flow rate and the integrated filtration flow rate when the membrane module is continuously filtered without washing. Sample 203 shows the relationship between the instantaneous flow rate and the integrated filtration flow rate when the membrane module is back-washed for 1 minute after filtration for 30 minutes. Sample 205 shows the relationship between the instantaneous flow rate and the integrated filtration flow rate when the membrane module is back washed for 1 minute after filtration for 5 minutes. As can be seen from FIG. 7, the higher the frequency of cleaning the membrane module, the higher the instantaneous flow rate can be maintained. Therefore, it is desirable to increase the frequency of cleaning the filter in the cleaning method using reverse cleaning.

  And what was described in patent document 1 is known as a washing | cleaning means by the reverse washing | cleaning of an undersink type water purification system.

  In the cleaning system described in Patent Document 1, a user operates a faucet lever to discharge purified water, a reverse cleaning state in which hot water flows back into the filter to backwash the filter, and a faucet. It is comprised so that the water stop state which interrupts | blocks water supply of this can be switched.

Japanese Patent Laid-Open No. 10-9411

  However, in the cleaning system described in Patent Document 1, since unpurified hot water passes through the purified water flow path, residual chlorine, microorganisms, red rust, etc. remain in the water purifier and the purified water flow path. They could be mixed.

  Then, this invention is made | formed in order to solve the problem mentioned above, and provides the water faucet used for the water purifying system and water purifying system which reduces possibility that residual chlorine, microorganisms, red rust, etc. will be mixed with purified water. With the goal.

  In order to solve the above-described problems, the present invention provides a raw water pipe for flowing raw water to a water purification apparatus, a water purification pipe for flowing purified water purified by the water purification apparatus to a faucet, and the raw water pipe upstream of the water purification apparatus. The water purifier is connected to the raw water pipe, and the water purifier is connected to the downstream side of the filter, and purifies the purified water according to the pressure of the purified water purified by the filter. And a tank for discharging the stored purified water, and the faucet is connected to a purified water outlet for discharging purified water purified by the filter, and 1) the purified water outlet and the purified water pipe are connected to the tank. Purified water discharge state that discharges water from the purified water discharge port while storing purified water, 2) Closes the purified water discharge port, and connects the raw water pipe downstream of the drain discharge port and the drain discharge port, Purification stored in the tank And the flow toward the filter and the water discharge spout via the raw water pipe, and an operating device for switching between drainage water discharge state to drain from the drainage spout.

  According to the present invention configured as described above, by operating the faucet to be in the purified water discharge state, the raw water is flowed toward the water purification device, and the water purified by the water purification device is discharged from the purified water discharge port. Can do. Moreover, in the purified water discharge state, the purified water that has passed through the filter flows into the purified water pipe or tank. Therefore, in the purified water discharge state, the purified water can be stored in the tank while discharging water from the purified water discharge port. Moreover, in the drainage water discharge state, since the purified water discharge port is closed, the purified water in the tank flows backward in the filter. Thereby, what is called back washing | cleaning can be performed with respect to a filter.

  Thus, according to the present invention, the filter can be washed with the purified water stored in the tank. Therefore, it is possible to provide a water purification system and a faucet used in the water purification system in which the possibility that microorganisms and red rust are mixed with the purified water is reduced. Moreover, a filter can be back-washed by making a faucet into a drainage water discharge state. Moreover, according to this invention, the waste_water | drain which performed back washing | cleaning can be discharged | emitted without letting a purified water pipe pass. Thereby, possibility that residual chlorine, microorganisms, red rust, etc. will be mixed with purified water can be reduced.

  In the above-described case, the raw water pipe includes a first raw water pipe that flows raw water to the faucet, and a second raw water pipe that flows raw water from the faucet to the water purifier, and the faucet has the drain spout. It is preferable to provide.

  By comprising in this way, the water faucet is provided with the purified water outlet, the drain outlet, and the operating device. Therefore, sampling of purified water purified by the water purification device, confirmation of the backwashing state of the filter, and switching operation between the purified water discharge state and the drainage discharge state can be performed at one place.

  In the case described above, the operation device can switch between the purified water discharge state and a water stop state where the purified water discharge port is closed, and the water stop state is preferably the drain water discharge state.

  By comprising in this way, by setting it as a waste_water | drain water discharge state, a filter can be back-washed and water discharge can be stopped automatically after that. Therefore, according to the present invention, the filter can be automatically back-washed by stopping water discharge from the purified water discharge port without performing a special operation. Thereby, the frequency of backwashing can be increased without performing a special operation, and the water purification performance of the filter can be maintained.

  The water purifier includes a first filter connected to the raw water pipe and a second filter connected to the downstream side of the first filter via a connecting pipe, and the connecting pipe is also connected to the tank. It is preferable that it is connected.

  By comprising in this way, in the clean water discharging state, the purified water which passed the 1st filter flows into a connecting pipe, and flows into a 2nd filter or a tank from a connecting pipe. And when purified water passes a 2nd filter, since a predetermined pressure loss arises, the water pressure in a connection pipe rises. And if the water pressure in a connecting pipe rises, purified water will begin to flow also in the direction of a tank in addition to the direction of the 2nd filter. Accordingly, the purified water is diverted toward the tank and the second filter. Thereby, purified water is stored in the tank. Further, in the drainage spout state, the purified water spout is closed, so the purified water in the tank flows toward the direction of low water pressure, that is, to the open drain spout. When the purified water in the tank flows toward the drain outlet, the purified water flows back through the first filter via the connecting pipe. Thereby, what is called reverse cleaning can be performed to the first filter. And the waste_water | drain which wash | cleaned the 1st filter is discharged from a waste_water | drain outlet. And if the water in a tank runs out, the drainage from a drain outlet will stop. Thereby, the water discharge from the purified water outlet and the drain outlet stops, and the faucet enters a water stop state. Therefore, according to this invention, purified water can be stored in a tank using the pressure loss with a 2nd filter. In addition, the first filter to which dirt such as turbidity in raw water is most likely to adhere can be back-washed with purified water stored in a tank.

  The tank is preferably an accumulator.

  The accumulator preferably includes a rubber bag inside.

  Moreover, it is preferable that the water inlet of the tank is opened downward.

  The first filter preferably includes any one of a microfiltration membrane, an ultrafiltration membrane, and a nanofiltration membrane.

  By comprising in this way, the turbidity in raw | natural water can be supplemented with a 1st filter. Therefore, the filtration performance of the latter stage filter can be maintained. Furthermore, microfiltration membranes, ultrafiltration membranes, and nanofiltration membranes that are easily clogged can be back-washed.

  Moreover, it is preferable that said 1st filter is equipped with either an ion exchange resin or activated carbon.

  Moreover, it is preferable that said 2nd filter is equipped with either an ion exchange resin or activated carbon.

  Moreover, it is preferable that the capacity | capacitance of a tank is 2-3 times with respect to the amount of stagnant water of said 1st filter.

  In order to solve the above-described problem, the present invention can communicate with the first raw water pipe that allows the raw water to flow to the faucet and the second raw water pipe that allows the raw water to flow from the faucet to the water purifier. A fixed disk having a second hole, a purified water pipe for flowing purified water purified by the water purification device to the faucet, and a third hole connected to a purified water outlet connected to the downstream side of the purified water pipe; A movable disk rotatably disposed on the fixed disk and having a movable hole, and 1) communicating the movable hole and the third hole by rotating the movable disk on the fixed disk. The purified water discharge state in which the purified water pipe and the purified water discharge port are communicated with each other and discharged from the purified water discharge port, 2) the first hole and the third hole are closed by the movable disk, and the second hole By opening the water purification Location, and through the second raw water pipe, the flow of water toward the second than the raw water pipe connected to the upstream drainage spout, is switchable and drainage water discharge state to drain from the drainage spout.

  By comprising in this way, the waste_water | drain which performed back washing | cleaning can be discharged | emitted without letting a purified water pipe pass. Thereby, possibility that residual chlorine, microorganisms, red rust, etc. will be mixed with purified water can be reduced.

  As described above, according to the present invention, it is possible to provide a water purification system and a faucet used in the water purification system that reduce the possibility of residual chlorine, microorganisms, red rust and the like being mixed with purified water.

It is the schematic which shows the water purification system by embodiment of this invention. It is the schematic which shows the exclusive water tap by embodiment of this invention. It is the schematic which shows the exclusive water tap by embodiment of this invention. It is a perspective view which shows the structure of the water purifier by embodiment of this invention. It is a perspective view which shows the structure of the water purifier by embodiment of this invention. It is the schematic which shows the structure of the water purifier by embodiment of this invention. It is a graph which shows roughly the relationship between the instantaneous flow rate (L / min) of the membrane module made from PE, and an integrated filtration flow rate (L).

  Hereinafter, a water purification system according to an embodiment of the present invention will be described with reference to the drawings. FIG. 1 is a schematic view showing a water purification system according to an embodiment of the present invention. In the water purification system described here, water pressure is always applied in the water purification system.

  As shown in FIG. 1, the water purification system 1 includes a raw water inlet 13 for taking raw water into the water purification system 1, a water purification device 3 for purifying the raw water, and a dedicated faucet 5 for discharging the purified water. And. Moreover, the water purifier 3 and the dedicated faucet 5 are connected to two raw water pipes that flow raw water to the water purifier 3. The raw water pipe is composed of a first raw water pipe 7 for flowing the raw water to the dedicated faucet 5 and a second raw water pipe 9 for flowing the raw water from the dedicated water tap 5 to the water purifier 3. Furthermore, the water purifier 3 and the dedicated faucet 5 are connected to a water purifier 11 for flowing water purified by the water purifier 3 to the dedicated faucet 5.

  The raw water inlet 13 is connected to a general faucet 17 for discharging the raw water as it is without purifying it, and is connected to the dedicated faucet 5 via the first raw water pipe 7. A branch plug 19 is provided between the raw water inlet 13 and the general water tap 17 and between the raw water inlet 13 and the dedicated water tap 5. The raw water flowing into the water purification system 1 from the raw water inlet 13 flows through the branch plug 19 toward the open water tap. That is, in the water purification system 1 according to the present embodiment, since the raw water is always supplied from the raw water inlet 13 to the water purification system, the water pressure is always applied to the water purification system 1. The general faucet 17 is also connected to a hot water inlet 15 through which hot water flows into the general faucet, and discharges the hot water flowing into the water purification system 1 without purification.

  The first raw water pipe 7 extends between the branch plug 19 and the dedicated faucet 5, and is configured to flow the raw water flowing into the water purification system 1 from the raw water inlet 13 through the branch plug 19 to the dedicated faucet 5. Has been. The second raw water pipe 9 extends between the dedicated faucet 5 and the water purifier 3, and the outlet of the second raw water pipe 9 is connected to the inlet of the water purifier 3. The second raw water pipe 9 is configured to allow water to flow between the dedicated faucet 5 and the water purifier 3. Further, the water purification pipe 11 extends between the water purification device 3 and the dedicated water faucet 5 and is configured to flow the water purified by the water purification device 3 to the dedicated water faucet 5.

  2 and 3 are schematic views showing a dedicated water faucet. The dedicated faucet 5 includes a purified water outlet 21 for discharging water purified by the water purification apparatus 3 and a drain outlet 23 for discharging waste water used to wash the water purification apparatus 3 by a method described later. The dedicated water faucet 5 has a switching valve 25 formed by overlapping two disks. The switching valve 25 rotates the movable disk 27 with respect to the fixed disk 29 according to the operation of the lever 5 a provided in the dedicated water faucet 5, thereby opening and closing the purified water outlet 21 and the drain outlet 23. It is configured to do so.

  The switching valve 25 is formed by concentrically stacking a movable disk 27 having a crescent shape and a single movable hole 31 on a disk-shaped fixed disk 29 having three holes. Has been. In the three holes of the fixed disk 29, the first hole 33 and the second hole 35 are arranged close to each other, and only the third hole 37 is arranged apart. The movable disk 27 has a crescent shape in which a region where the first hole 33 and the second hole 35 are formed is cut out from a disk having the same shape as the fixed disk 29. The movable disk 27 rotates around the axes of the fixed disk 29 and the movable disk 27 in accordance with the operation of the lever 5a by the user, whereby the movable hole 31 rotates around the axis with respect to the fixed disk 29. To do. A stopper (not shown) is attached to the lever 5a, and the dedicated faucet can be switched between a clean water discharge state and a drain water discharge state by stopping the lever 5a at a fixed position by the stopper. Has been. As shown in FIG. 2, the clean water discharge state means that the drainage water discharge port 23 is closed, the first hole 33 and the second hole 35 are exposed from the cutout of the movable disk, and the third hole 37 and the movable hole 31 are formed. The state which connected, ie, the state which the 1st hole 33, the 2nd hole 35, and the 3rd hole 37 opened, and the purified water spout 21 opened is pointed out. Further, as shown in FIG. 3, the drainage water discharge state means that the first hole 33 and the third hole 37 are closed by the movable disk 27, the movable hole 31 is closed by the fixed disk 29, and only the second hole 35 is used. And the drainage outlet 23 is open.

  Next, the configuration of the switching structure 25 will be described in more detail. First, the purified water discharge state shown in FIG. 2 will be described in detail. As shown in FIG. 2, the movable disk 27 is arranged on the fixed disk 29 so that the movable hole 31 of the movable disk 27 communicates with the third hole 37 of the fixed disk 29 in the clean water discharge state.

  The first hole 33 of the fixed disk 29 communicates with the first raw water pipe 7. Therefore, in the state where the first hole 33 is opened, the inlet from the first raw water pipe 7 to the dedicated faucet 5 is opened, and the raw water flows into the dedicated water faucet 5 from the first raw water pipe 7. Further, the second hole 35 of the fixed disk 29 communicates with the second raw water pipe 9 and does not communicate with the drainage outlet 23. Accordingly, the water in the first raw water pipe 7 flows toward the second raw water pipe 9. Further, the third hole 37 and the movable hole 31 of the movable disk 27 communicate with the purified water pipe 11 and the purified water spout 21. Therefore, in the state where the third hole 37 and the movable hole 31 communicate with each other, the purified water in the purified water pipe 11 flows toward the purified water spout 21.

  Next, the drainage water discharge state shown in FIG. 3 will be described in detail. As shown in FIG. 3, in the drainage water discharge state, the first hole 33 and the third hole 37 of the fixed disk 29 are closed by the movable disk 27, and the movable hole 31 of the movable disk 27 is closed by the fixed disk 27. Further, the movable disk 27 is disposed on the fixed disk 29 so that the second hole 35 of the fixed disk 29 communicates with the drain outlet.

  In this state, the first hole 33 of the fixed disk 29 is closed by the movable disk 27. Accordingly, the inlet from the first raw water pipe 7 to the dedicated water faucet 5 is closed, and the raw water does not flow into the dedicated water faucet 5 from the first raw water pipe 7. The second hole 35 of the fixed disk 29 communicates with the second raw water pipe 9 and further communicates with the drainage outlet 23. Therefore, the waste water used to wash the water purifier 3 described later flows from the second raw water pipe 9 toward the drain outlet 23. Further, the third hole 37 of the fixed disk 29 is closed by the movable disk 27. Further, the movable hole 31 of the movable disk 27 is closed by a fixed disk 29. Therefore, the purified water in the purified water pipe 11 does not flow into the dedicated faucet 5.

  FIG. 4 is a perspective view showing the configuration of the water purifier, FIG. 5 is a perspective view showing a modification of the water purifier, and FIG. 6 is a schematic diagram showing the configuration of the water purifier. As shown in FIGS. 4 and 6, the water purifier 3 is formed by connecting three filters in series. The filter on the most upstream side of the water purifier 3 is a so-called prefilter 39 (first filter) that supplements turbidity contained in the raw water. An adsorption filter 41 (second filter) including an adsorbent is connected to the downstream side of the prefilter 39, and a hollow fiber membrane filter 43 including a hollow fiber membrane is connected to the downstream side of the adsorption filter 41. Yes.

  The prefilter 39 includes a header 101 connected to the second raw water pipe 9 and a cylindrical container 103 that can be attached to and detached from the header 101.

  The header 101 is configured such that water entering and exiting the cylindrical container 103 passes through the inside. The header 101 is connected to the dedicated faucet 5 via the second raw water pipe 9 upstream of the pre-filter 39 and is connected to the adsorption cartridge 41 via the first connecting pipe 47 on the downstream side.

  A hollow fiber membrane 45 is accommodated inside the cylindrical container 103. The prefilter 39 includes a cap 105 attached to the open end of the cylindrical container 103 and connectable to the header 101. The cap 105 is configured to flow the raw water flowing from the second raw water pipe 9 into the header 103 in the longitudinal direction of the cylindrical container 103 as indicated by an arrow A. In addition, a purified water outlet pipe 107 extending in the vertical direction is provided at the center of the cap 105. The purified water outlet pipe 107 flows the purified water toward the header 101 as indicated by an arrow B. Then, the purified water that has flowed from the purified water outlet pipe 107 to the header 101 flows to the first connecting pipe 47.

  The hollow fiber membrane 45 in the pre-filter 39 is bent in a U shape and both ends thereof are held by a potting material 49. And many hollow fiber membranes comprise the columnar body by bending many hollow fiber membranes in U shape and fixing the edge part to the potting material 49. FIG. Examples of the hollow fiber membrane 45 include cellulose, polyolefin (polyethylene, polypropylene), polyvinyl alcohol, ethylene / vinyl alcohol copolymer, polyether, polymethyl methacrylate (PMMA), polysulfone, poly It is preferable to use materials made of various materials such as acrylonitrile, polyfluorinated ethylene (Teflon (registered trademark)), polycarbonate, polyester, polyamide, and aromatic polyamide. Among these materials, polyolefin hollow fiber membranes such as polyethylene and polypropylene are used, especially considering the strength and flexibility of the membrane, bendability, cleanability, handleability, and high chemical resistance. It is preferable. In consideration of processability and the like, it is preferable to use a polyethylene-based hollow fiber membrane.

  In addition, the cylindrical container 103 is filled with powdered or granular adsorbent (activated carbon, zeolite, molecular sieve, ion exchange resin, etc.), fibrous adsorbent (fibrous activated carbon), etc., instead of the hollow fiber membrane 45. May be. Among these materials, it is preferable to use an ion exchange resin or activated carbon particularly considering the adsorptivity. The filtration performance of the hollow fiber membrane 45 may be maintained by using the hollow fiber membrane 45 and an adsorbent together.

  The suction filter 41 includes a suction cartridge 51 inside. The water flowing into the adsorption filter 41 from the pre-filter 39 through the first connecting pipe 47 passes through the adsorption cartridge 51 and is filtered and discharged from the adsorption filter 41. The purified water discharged from the adsorption filter 41 flows to the hollow fiber membrane filter 43 through the second connection pipe 53.

  Examples of the adsorption cartridge 51 include powdery or granular adsorbents (activated carbon, zeolite, molecular sieve, ion exchange resin, etc.), fibrous adsorbents (fibrous activated carbon), and the like. Among these materials, it is preferable to use an ion exchange resin or activated carbon particularly considering the adsorptivity.

  The hollow fiber membrane filter 43 includes a bundle of hollow fiber membranes 55 inside, as in the prefilter 39. The hole diameter of the hollow fiber membrane 55 of the hollow fiber membrane filter 43 is preferably smaller than the hole diameter of the hollow fiber membrane 45 of the prefilter 39. Accordingly, a relatively large turbidity can be captured by the pre-filter 39 and a relatively small turbidity can be captured by the hollow fiber membrane filter 43. The outlet of the hollow fiber membrane filter 43 is connected to the purified water pipe 11, and the purified water purified by the hollow fiber membrane filter 43 flows into the purified water pipe 11.

  The first connection pipe 47 is connected to the tank 57, and the purified water purified by the prefilter 39 flows into the tank 57 according to the pressure in the first connection pipe 47 and is stored in the tank 57. The tank is constituted by, for example, an accumulator having a rubber bag 59 therein, that is, a diaphragm type accumulator. When the water pressure in the first connecting pipe 47 is high, the purified water in the first connecting pipe 47 flows into the tank 57 and is stored in the tank 57 while inflating the rubber bag 59. The case where the water pressure in the first connecting pipe 47 is high is when the purified water purified by the prefilter 39 flows toward the adsorption filter 41. That is, when purified water flows into the adsorption filter 41, a predetermined pressure loss is generated by the adsorption filter 41, so that the pressure in the first connection pipe 47 gradually increases. When the water pressure in the first connecting pipe 47 exceeds a certain level, that is, when the contraction force of the rubber bag 59 in the tank 57 is exceeded, the rubber bag 59 in the tank 57 starts to expand due to the water pressure. Thereby, the purified water can be stored in the tank 57. In addition, when the pressure in the first connecting pipe 47 is low, the tank 57 pumps the purified water stored in the tank 57 into the first connecting pipe using the contraction force of the rubber bag 59 and the air pressure in the tank 57. To do.

  As shown in FIG. 4, the direction in which the tank 57 is connected to the first connecting pipe 47 is such that the water inlet of the tank 57 faces downward, and the water inlet of the tank 57 faces upward as shown in FIG. There is such a direction. When the tank 57 is arranged so that the water inlet of the tank 57 is connected upward to the first connecting pipe 47, that is, the water inlet opens downward, the air in the tank 57 accumulates in the upper part, and even when the pressure drops Not exhausted. Therefore, the internal air contracts as the water pressure increases, and when the water pressure is released, the internal air expands and is fed into the first connecting pipe, so that the rubber bag 59 need not be provided in the tank 57. In the present embodiment, the tank 57 is connected to the first connection pipe 47, but the tank 57 may be directly connected to the header 101.

  The capacity of the tank 57 can be appropriately selected according to the amount of water stagnated in the prefilter 39, and is preferably 2 to 3 times the amount of water stagnated in the prefilter 39. In this case, an amount of purified water that can sufficiently wash the membrane can be stored. For example, when the amount of stagnant water in the prefilter 39 is 400 cc, the capacity of the tank 57 is preferably set to 800 to 1200 cc.

  Next, the operation of the water purification system according to the embodiment of the present invention will be described.

  The effect | action in the purified water discharge state which discharges purified water from the exclusive water tap 5 is explained in full detail. When discharging purified water from the purified water outlet 21 of the dedicated faucet 5, the user operates the lever to the purified water position. By this operation, the movable disk 27 is rotated, the movable disk 27 closes the drainage outlet 23, and the first hole 33, the second hole 35, the third hole 37, the movable hole 31, and the purified water outlet are opened. To do. As a result, the raw water flowing into the water purification system 1 from the raw water inlet 13 flows through the first raw water pipe 7 to the dedicated faucet 5, flows into the dedicated faucet 5 through the first hole 33, and passes through the second hole 35. It flows into the second raw water pipe 9 and flows through the second raw water pipe 9 to the water purifier 3. And the raw | natural water which flowed into the water purifier 3 is purified with the pre filter 39 of the water purifier 3. Then, the water purified by the prefilter 39 flows into the first connecting pipe 47. The purified water in the first connecting pipe 47 gradually flows into the adsorption filter 41, but the amount of purified water discharged from the pre-filter 39 is larger than the amount entering the adsorption filter 41. Therefore, the water pressure in the first connecting pipe 47 gradually increases. When the water pressure in the first connection pipe 47 becomes a certain level or more, the purified water in the first connection pipe 47 inflates the rubber bag 59 against the contraction force of the rubber bag 59 and the pressure in the tank 57, and enters the tank 57. Accumulate.

  On the other hand, the purified water flowing into the adsorption filter 41 is purified by the adsorption cartridge 51 and flows into the second connection pipe 53. The purified water that has flowed to the second connection pipe 53 flows to the hollow fiber membrane filter 43 through the second connection pipe 53. Then, the purified water that has passed through the hollow fiber membrane filter 43 flows to the dedicated faucet 5 through the purified water pipe 11. The purified water that has flowed into the dedicated faucet 5 flows toward the purified water outlet 21 through the third hole 37 of the fixed disk 29 and the movable hole 31 of the movable disk 27, and is discharged from the purified water outlet 21.

  If the purified water discharge state is continuously maintained, the purified water that has flowed into the first connecting pipe 47 from the prefilter 39 flows into the tank 57, and when the tank 57 is filled with the purified water, the purified water flows into the tank 57. Ends. The purified water that has passed through the prefilter 39 continues to flow toward the adsorption filter 41 on the downstream side. In this specification, the “purified water discharge state” means that the purified water is discharged from the dedicated faucet 5 while storing the purified water in the tank 57, and the tank 57 is filled with the purified water. Although the purified water stops flowing, the state in which the water purified by the pre-filter 39, the adsorption filter 41, and the hollow fiber membrane filter 43 is discharged from the dedicated faucet 5 is also included.

  Next, the action in the drainage water discharge state that can wash the prefilter 39 will be described in detail. In this case, the user operates the lever to the water stop position with the purified water stored in the tank 57. By this operation, the movable disk 27 is rotated so that the movable disk 27 closes the first hole 33, the third hole 37, the movable hole 31 and the purified water outlet, and opens the second hole 35 and the drain outlet 23. To do. Thereby, the 2nd raw | natural water pipe 9, the 2nd hole 35, and the drain outlet 23 will be in a communication state. Since this water purification system is under water pressure even when not in use, when the drainage outlet 23 is opened, the water in the water purification system 1 flows toward the drainage outlet 23. Thereby, the water pressure in the pre-filter 39 and the water pressure in the 1st connection pipe 47 also fall. When the water pressure in the first connection pipe 47 is reduced, the purified water in the rubber bag 59 is pumped into the first connection pipe 47 by the contraction force of the rubber bag 59 in the tank 57 and the atmospheric pressure in the tank 57. At this time, since the third hole 37 of the fixed disk 29 is closed by the movable disk 27, the purified water pumped to the first connection pipe 47 does not flow toward the downstream side, but toward the upstream side where the pressure is low. Flowing. When the purified water in the first connection pipe 47 flows into the prefilter from the outlet side of the prefilter 39, the purified water flows in the prefilter 39 in the direction opposite to that during filtration. Therefore, it is discharged to the surface of the hollow fiber membrane through the inside of the hollow fiber membrane. Thereby, the turbidity adhering to the surface of the hollow fiber membrane can be removed. Thereby, the pre-filter 39 can be back-washed. And the water which back-washed the pre filter 39 flows back through the 2nd raw | natural water pipe 9, and flows into the exclusive water tap 5. FIG. And the water which flowed in in the exclusive water tap 5 flows into the drainage outlet 23 through the 2nd hole 35, and is drained from the drainage outlet 23 as waste_water | drain. Then, when the purified water in the tank 57 becomes empty, the reverse cleaning of the prefilter 39 is automatically terminated. In this case, since the first hole 33 of the fixed disk 29 is blocked, further raw water does not flow into the dedicated faucet 5, and when the prefilter 39 has been drained, the dedicated faucet 5 is stopped. It becomes a water state.

  As described above, according to the water purification system of the present embodiment, the pre-filter 39 can be back-washed using the purified water stored in the tank 57 in the drained water discharge state and the purified water stored in the tank 57 in the drained water discharge state. Thereby, the possibility that microorganisms and red rust are mixed in the purified water is reduced. In addition, if the dedicated water faucet 5 is set in a water-stopped state without any particular attention by the user, the prefilter 39 can be automatically backwashed by entering the drainage water discharge state. And the washing | cleaning of the pre filter 39 is automatically performed whenever it switches from a clean water discharging state to a water stop state (drainage discharging state). Thereby, the water purification performance of the pre-filter 39 can be maintained. Further, since the cleaning of the pre-filter 39 automatically ends when the purified water in the tank 57 runs out, it is possible to reliably prevent the water from being forgotten to stop when the reverse cleaning is performed. Further, by increasing the frequency of cleaning the prefilter 39 and maintaining the water purification performance of the prefilter 39, the lifetime of the filters 41 and 43 on the downstream side of the prefilter 39 can be extended.

  Moreover, according to the water purification system by this embodiment, since the drain outlet was provided separately from the other outlets, it can prevent that a user accidentally drinks waste water.

  In addition, this invention is not limited to the above-mentioned embodiment, Each structure of the washing | cleaning system by the above-mentioned embodiment can be changed suitably.

  In the above-described embodiment, the user operates the lever 5a to the water stop position to enter the water discharge state after passing through the water discharge state. However, the drain water discharge position may be provided separately from the water stop position. . In this case, the movable disk and the fixed disk are brought into the state shown in FIG. 3 by operating the lever 5a to the drain water discharge position. Further, by operating the lever 5a to the water stop position, the first hole 33, the second hole 35, and the third hole 37 are closed by the movable disk 27, and the movable hole 31 is closed by the fixed disk 29. And good. Since the second raw water pipe and the drain outlet 23 are not connected at the water stop position, it is possible to prevent foreign matters and microorganisms from being contaminated.

  Moreover, in the above-described embodiment, the dedicated faucet provided the purified water outlet and the drain outlet independently, but it is not necessary to divide the outlet according to the nature of the water to be discharged, and the purified water outlet and The drain outlet may be a single outlet. In this case, a drain water discharge pipe communicating with the purified water discharge port is disposed on the movable disk 27. In the drainage water discharge state, the second hole 35 of the fixed disk 29 and the drainage water discharge pipe communicate with each other, and the water that has washed the prefilter 39 is discharged from the purified water discharge port.

  Moreover, in the above-mentioned embodiment, although the purified water outlet and the drain outlet were directly connected with the purified water pipe and the raw water pipe, they may be connected via a pipe or the like. In this case, the purified water outlet and the drain outlet The connected piping is opened and closed by a movable disk.

  In the above-described embodiment, a plurality of filters (the adsorption filter 39 and the hollow fiber membrane filter 41) are connected to the downstream side of the pre-filter, but the plurality of filters may not be provided downstream. In this case, in the purified water discharge state, a valve or the like may be provided so that the water pressure in the connecting pipe is increased, so that the purified water can flow into the tank.

  In the above-described embodiment, the purified water in the first connection pipe 47 is stored in the rubber bag 59, but may be stored in the tank 57. In this case, a Prada-type accumulator having a rubber bag filled with air or nitrogen gas at the bottom of the tank 57 is used. When the water pressure in the first connecting pipe 47 is high, the purified water in the first connecting pipe 47 is stored in the tank 57 while contracting the rubber bag. Moreover, when the pressure in the 1st connection pipe 47 is low, the purified water stored by the tank 57 is pumped in the 1st connection pipe using the expansion | swelling force of a rubber bag.

  Further, in the above-described embodiment, the movable disk has a crescent-shaped cutout portion, but it does not have to be in a crescent shape. Any shape may be used as long as the first hole 33 and the second hole 35 of the fixed disk communicate with each other and the second hole 35 of the fixed disk communicates with the drain outlet 23.

  In the above-described embodiment, “upstream side” and “downstream side” mean directions in the flow path where the raw water inlet is the most upstream and the water discharge port is the most downstream. Therefore, when discharging purified water, the water flows from the upstream side to the downstream side, and when performing reverse cleaning, the water flows from the downstream side toward the upstream side. “Upper side” and “lower side” indicate directions in the direction of gravity, the header 101 side is referred to as the upper side, and the bottom wall side of the cylindrical container 103 is referred to as the lower side.

  Examples of the present invention will be described below.

  In the example, two filters having a water stagnation amount of 400 cc were prepared, and a tank having no rubber bag was connected between them. The tank was connected between the filters so that the water inlet faced downward. The capacity of the tank was 1200 cc. From the upstream side of the filter, raw water was allowed to flow for 1 minute under a predetermined pressure, and while storing the purified water in the tank, the raw water was purified with two filters and drained as purified water. After that, the water outlet and the raw water inlet were shut off at the same time. Subsequently, the waste water was drained by passing through an upstream filter. Table 1 shows the relationship between the pressure when raw water enters, the flow rate of purified water, and the discharge amount of waste water.

  As can be seen from Table 1, the discharge amount of the waste water, that is, the amount of purified water that can be stored in the tank increases in accordance with the pressure when the raw water enters and the flow rate of the purified water. Therefore, according to the present embodiment, the amount of stored water in the tank can be increased by increasing the pressure at the time of entering raw water and the flow rate of purified water, thereby increasing the amount of cleaning water that can be used during backwashing. You can see that

DESCRIPTION OF SYMBOLS 1 Water purification system 3 Water purifier 5 Dedicated faucet 7 1st raw water pipe 9 2nd raw water pipe 11 Purified water pipe 21 Purified water outlet 23 Drain outlet 25 Switching structure 27 Movable disk 29 Fixed disk 31 Movable hole 33 First hole 35 Second Hole 37 Third hole 39 Prefilter 41 Adsorption filter

With this configuration, it is possible to capture the contaminants in the raw water in the first filter. Therefore, the filtration performance of the latter stage filter can be maintained. Furthermore, microfiltration membranes, ultrafiltration membranes, and nanofiltration membranes that are easily clogged can be back-washed.

FIG. 4 is a perspective view showing the configuration of the water purifier, FIG. 5 is a perspective view showing a modification of the water purifier, and FIG. 6 is a schematic diagram showing the configuration of the water purifier. As shown in FIGS. 4 and 6, the water purifier 3 is formed by connecting three filters in series. The filter on the most upstream side of the water purifier 3 is a so-called prefilter 39 (first filter) that captures turbidity contained in the raw water. An adsorption filter 41 (second filter) including an adsorbent is connected to the downstream side of the prefilter 39, and a hollow fiber membrane filter 43 including a hollow fiber membrane is connected to the downstream side of the adsorption filter 41. Yes.

The hollow fiber membrane filter 43 includes a bundle of hollow fiber membranes 55 inside, as in the prefilter 39. The hole diameter of the hollow fiber membrane 55 of the hollow fiber membrane filter 43 is preferably smaller than the hole diameter of the hollow fiber membrane 45 of the prefilter 39. This makes it possible to capture a relatively small contaminants by the hollow fiber membrane filter 43 to capture relatively large contaminants by the pre-filter 39. The outlet of the hollow fiber membrane filter 43 is connected to the purified water pipe 11, and the purified water purified by the hollow fiber membrane filter 43 flows into the purified water pipe 11.

Claims (12)

A raw water pipe for flowing raw water to the water purification apparatus, a water purification pipe for flowing purified water purified by the water purification apparatus to the faucet, and a drain spout connected to the raw water pipe on the upstream side of the water purification apparatus,
The water purifier includes a filter connected to the raw water pipe, and a tank connected to the downstream side of the filter and storing the purified water or discharging the stored purified water according to the pressure of the purified water purified by the filter. Prepared,
The water faucet is a water purification system comprising a purified water outlet for discharging purified water purified by the filter, and an operation device for switching between a purified water discharge state and a drain water discharge state described below.
1) A purified water discharge state in which the purified water discharge port is connected to the purified water pipe and water is discharged from the purified water discharge port while storing purified water in the tank.
2) Close the purified water spout and connect the raw water pipe on the downstream side of the drain spout and the drain spout and connect the purified water stored in the tank through the filter and the raw water pipe. A drainage discharge state in which the wastewater is discharged toward the drainage spout and drained from the drainage spout.   The raw water pipe includes a first raw water pipe that flows raw water to the faucet, and a second raw water pipe that flows raw water from the faucet to the water purifier, and the faucet includes the drain spout. Item 2. A water purification system according to item 1.   3. The operation device according to claim 1, wherein the operation device can switch between the purified water discharge state and a water stop state that closes the purified water discharge port, and the water stop state becomes the drain water discharge state. The described water purification system.   The water purifier has a first filter connected to the raw water pipe and a second filter connected to the downstream side of the first filter via a connecting pipe, and the connecting pipe is also connected to the tank. The water purification system according to any one of claims 1 to 3.   The water purification system according to any one of claims 1 to 4, wherein the tank is an accumulator.   The water purification system according to claim 5, wherein the accumulator includes a rubber bag inside.   The water purification system according to any one of claims 1 to 4, wherein a water inlet of the tank is opened downward.   The water purification system according to any one of claims 4 to 7, wherein the first filter includes any one of a microfiltration membrane, an ultrafiltration membrane, and a nanofiltration membrane.   The water purification system according to any one of claims 4 to 8, wherein the first filter includes either an ion exchange resin or activated carbon.   The said 2nd filter is a water purification system of any one of Claims 4-9 provided with either an ion exchange resin or activated carbon.   The water purification system according to any one of claims 1 to 10, wherein the capacity of the tank is 2 to 3 times the amount of water stagnating in the first filter. A first hole capable of communicating with a first raw water pipe that flows raw water to a faucet;
A second hole capable of communicating with the second raw water pipe flowing from the faucet to the water purifier,
A fixed disk having a purified water pipe for flowing purified water purified by the water purification apparatus to the faucet and a third hole communicated with a purified water spout connected to the downstream side of the purified water pipe;
A movable disk rotatably disposed on the fixed disk and having a movable hole,
A switching valve capable of switching between the following two states by rotating the movable disk on the fixed disk.
1) A purified water discharge state in which the water purification pipe and the purified water outlet are connected by communicating the movable hole and the third hole, and water is discharged from the purified water outlet. 2) The first hole is formed by the movable disk. And by closing the third hole and opening the second hole, the water is passed through the water purifier and the second raw water pipe toward a drain outlet connected upstream of the second raw water pipe. The drainage water discharge state which drains and drains from the said drainage outlet.

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