JP5019094B2 - Water purifier - Google Patents

Description

  The present invention relates to a water purifier that purifies raw water by removing impure components such as iron and manganese contained in raw water taken from a water source such as a well.

  The raw water taken from a water source such as a well contains impurity components such as iron and manganese. For this reason, a water purifier for removing and purifying the impurity components has been proposed in the past. And the like.

  When raw water such as well water is taken, as a pretreatment, chemicals such as sodium hypochlorite are injected into the raw water to precipitate ions such as iron and manganese, and then the raw water is filtered into a filtration tank of a water purifier. Introduced to purify.

  Filter media such as anthracite and filter sand are accommodated in the filter tank of the water purifier. The raw water taken from the water source is introduced into the filtration tank, and when the raw water passes through the filter medium, impure components such as iron and manganese ions are captured and removed by the filter medium, and the filter tank is used as clear purified water. And is supplied to a predetermined water supply facility.

  Impurity components such as iron and manganese accumulate in the filter medium in the filtration tank as time passes. If the purification operation is continued with a certain amount or more of impure components accumulated in the filter medium, impure components exceeding a predetermined water quality standard will be contained in the purified water. For this reason, a backwash operation is performed as a means for removing dirt before impure components are accumulated in a filter medium in a certain amount or more.

  In this backwash operation, the raw water taken from the water source is caused to flow in the filtration tank so that the flow is opposite to that during the purification operation by switching the switching valve, and the impure components accumulated in the filter medium are washed away with the raw water. This is a process for restoring the function of the filter medium.

  During the backwash operation, the filter media collide with each other due to the force of the backflowing water, and the impure components such as iron and manganese are separated and the function of the filter media is recovered. There is a possibility that the particles remain in the filtration tank, and the particles may be mixed into the purified water during the subsequent purification operation. For this reason, at the initial stage of the purification operation after the backwash operation, a cleaning operation is performed in which the purified water is discarded as so-called waste water for a certain period of time. Then, after this cleaning operation, a normal purification operation is performed.

  By the way, in the conventional water purifier, a chemical solution injection device for injecting a chemical solution for oxidation / disinfection such as sodium hypochlorite into the raw water is provided on the primary side where the raw water is introduced into the filtration tank. The tank is filled with a filter medium in which the surface of ceramic filter sand is coated with manganese dioxide.

  Then, before the raw water is introduced into the filtration tank, a chemical solution such as sodium hypochlorite is injected into the raw water by the chemical solution injection device. By injecting this chemical solution, iron ions contained in the raw water are oxidized to become insoluble ferric hydroxide, and when the raw water passes through the filtration tank, ferric hydroxide as an impure component is physically treated by the filter medium. Captured.

  On the other hand, manganese ions contained in the raw water are not oxidized or precipitated by sodium hypochlorite injected by the chemical solution injection device, and when the raw water passes through the filtration tank, Catalytically oxidized by autocatalysis, becomes hydrated manganese dioxide and adheres to the filter medium. Hydrated manganese dioxide on the surface of the filter medium is always activated by sodium hypochlorite.

  As the time of the purification operation elapses, the ferric hydroxide particles trapped in the filter medium gradually start to cover the surface of the filter medium, begin to leak from the gaps between the filter medium, and contact oxidation of manganese ions It becomes a hindrance.

  Therefore, if the purification operation continues for a certain period of time, the concentration of iron and manganese in the treated water that has been purified exceeds the water quality standard. The filter medium inside is fluidized and stirred, and the iron and manganese particles adhering to the filter medium surface are peeled off and discharged outside the filter tank to restore the water purification capacity.

The chemical injection device includes a flow rate detection unit that detects the flow rate of raw water in order to keep the concentration of the chemical injection into the raw water constant. The flow rate detection unit includes a rotor blade with a magnet that rotates in accordance with the flow rate of the raw water, and detects the flow rate of the raw water by reading the number of rotations from a pulse generated by the movement of the magnet. And the chemical | medical solution of the quantity according to the flow volume is inject | poured into raw | natural water from the chemical | medical solution injection | pouring part.
JP 2003-269630 A

  However, raw water such as well water contains not only iron and manganese ions but also hardness components such as iron, fine sand, and calcium which are oxidized by air in the well and become insoluble. Then, a magnetic substance such as iron in the raw water adheres to the rotor blade with the magnet of the flow rate detection unit in the chemical injection device, or the hardness component adheres to the rotor rotating portion, causing the rotor blade to rotate. May be hindered, or rotation may be stopped and an appropriate amount of chemical may not be injected or may not be injected.

  As a countermeasure, there are cases where a strainer or sand strainer is installed on the primary side of the chemical solution injection device. However, the strainer or sand strainer cannot capture fine particles, and the equipment costs increase, making it economical. The burden increases.

  Therefore, it is conceivable to arrange the chemical injection part of the chemical injection device on the primary side of the filtration tank and the flow rate detection part on the secondary side. In this case, water that has passed through the filter medium in the filtration tank and has captured foreign matter such as iron flows to the flow rate detection unit and the flow rate is detected. Therefore, it is possible to detect an appropriate flow rate at all times, and the equipment cost is not particularly increased.

  However, in this case, during the backwash operation or washing operation in which the raw water is introduced into the filtration tank after the purification operation described above and the water that has passed through the filtration tank is discarded to the outside as waste water, the flow rate detection unit is not allowed to pass through. As a result, the chemical solution is not injected into the raw water introduced into the filtration tank, and the water that does not oxidize iron and manganese flows into the filtration tank. There is a problem that it sometimes leaks.

  Further, in the conventional water purifier, the flow rate detection unit and the chemical solution injection unit of the chemical solution injection device are provided on one side of the filtration tank, and the raw water pumped from the water source during any of the purification operation, backwash operation, and washing operation processes. Will contact the small-diameter hole of the chemical injection part, and for a long period of time, the small-diameter hole will be clogged with iron and hardness components in the raw water, and the injection of the chemical will be blocked or impossible. There is.

  The present invention has been made paying attention to such points, and the object of the present invention is to protect the flow rate detection unit of the chemical injection device from impure components, to prevent clogging of the chemical injection unit, and to backwash. An object of the present invention is to provide a water purifier capable of preventing inconvenience such that raw water without injection of a chemical solution flows into a filtration tank during operation or washing operation.

The present invention has an inflow pipe and an outflow pipe, a filter tank in which a filter medium is accommodated, and raw water pumped up from a water source such as a well from the inflow pipe through a first switching valve and a second switching valve. The raw water is supplied into the filtration tank and passed through the filter medium, so that the raw water flows out from the outflow pipe as clear purified water, and passes through the third switching valve and the fourth switching valve to a predetermined water supply facility and water storage tank . A purification operation means to supply, a chemical solution injection device for injecting a chemical solution for oxidization and sterilization into the raw water pumped from a water source such as a well, and the filter medium is above a certain level by continuing the purification operation by the purification operation means when soiled, the then first to fourth switching valve switching operation, a clear water in the water tank, the outlet tube into the filtration tank through the first switching valve and the third switching valve To feed back from Wherein the backwash operation means for causes flow out from the inflow pipe is discharged to the outside through the second switching valve, after backwash operation by the backwash operation means, said second and third changeover valve is switched operation, the Cleaning operation means for supplying the clear water in the water storage tank to the filtration tank so as to circulate in the forward direction from the inflow pipe, to flow out from the outflow pipe and to discharge to the outside through the fourth switching valve; The chemical solution injector includes a flow rate detection unit and a chemical solution injection unit, and the flow rate detection unit is arranged in the middle of the flow path from the outflow pipe of the filtration tank to the water supply facility and flows in the flow path. The flow rate of water is detected, and the chemical solution injection unit is arranged downstream of the first switching valve and corresponds to the amount of water detected by the flow rate detection unit in the raw water flowing out from the first switching valve. Injecting a quantity of medicinal solution It is characterized.

  The flow rate detection unit of the chemical liquid injector is disposed in the middle of the flow path leading from the outflow pipe of the filtration tank to the water supply facility and at the downstream side or the upstream side of the fourth switching valve.

  According to the water purifier of the present invention, the flow rate detection unit of the chemical solution injection device can be protected from impure components, and the chemical solution injection unit can be prevented from being clogged. Inconveniences such as inflow can be prevented.

  Embodiments of the present invention will be described below with reference to the drawings.

  FIG. 1 is a cross-sectional view showing a structure of a filtration tank of a water purifier according to the first embodiment, and FIG. 2 is an explanatory diagram showing a water passage route of the water purifier. The filtration tank 1 of the water purifier is configured in a sealed structure with a cylindrical body 1a having a bottom and a head plate 1b fastened to an opening at the upper end of the body 1a.

  A filter medium 2 such as anthracite, filter sand, or ceramic filter sand coated with manganese dioxide on the surface is housed in the filter tank 1 in a layer having a certain height. An inflow pipe 4 and an outflow pipe 5 are provided on the upper side of the filtration tank 1. The inflow pipe 4 and the outflow pipe 5 are horizontally inserted from the outside to the inside of the filtration tank 1 so as to penetrate the side surface of the body portion 1a.

  A water spray pipe 7 is attached to the end of the inflow pipe 4 inserted into the filtration tank 1, and a guide pipe 8 is attached to the end of the outflow pipe 5. The water spray pipe 7 is disposed on the upper side of the upper layer surface of the filter medium 2 and extends so that its tip end rises toward the center of the inner surface of the end plate 1b. The guide tube 8 is inserted from the upper layer to the lower layer of the filter medium 2, a connecting tube 9 is attached to the lower end portion thereof, and a resin filter 10 having a slit-like hole is attached to one end portion of the connecting tube 9. ing. The other end of the connecting tube 9 protrudes outside the filtration tank 1 as a drain port 11 that also serves as a screw-in port for a freeze-preventing heater, and the drain port 11 is sealed with a sealing plug 12.

  An electric valve device 15 that is connected to both the inflow pipe 4 and the outflow pipe 5 and switches a plurality of water flow paths is provided outside the filtration tank 1. As shown in FIG. 2, the valve device 15 includes an inlet 16, an outlet 17, a second inlet 18, a purified water outlet 19, a backwash water outlet 21, and a washing water outlet 22. An outlet 17 is connected to the inflow pipe 4, and the second inflow port 18 is connected to the outflow pipe 5.

  The valve device 15 includes a flow path a that leads from the inlet 16 to the outlet 17 via the first switching valve 25 and the second switching valve 26, and a third switching valve 27 from the second inlet 18. And the third switching valve branched from the flow path b leading to the purified water discharge port 19 via the fourth switching valve 28 and the flow path a between the first and second switching valves 25, 26. 27, a flow path c that leads to the flow path b, a flow path d that leads out from the second switching valve 26 and leads to the backwash water discharge port 21, and a lead out from the fourth switching valve 28. And a flow passage e communicating with the washing water discharge port 22.

  A water supply pipe 31 led out from a well 30 as a water source is connected to the inflow port 16, and a water pump 33 is provided in the middle of the water supply pipe 31, and the raw water in the well 30 is pumped up by the water pump 33. It is supplied to the inlet 16 through the water supply pipe 31.

  The purified water discharge port 19 is connected to a water conduit 37 that leads to a water supply facility 36, and a branch pipe 34 that leads to a water storage tank 38 is led from the middle of the water conduit 37. A water conduit 39 is led out from the water storage tank 38, and the water conduit 39 is connected to the flow path a through the first switching valve 25. A water supply pump 40 is provided in the middle of the water conduit 39.

  A chemical solution injector 42 is provided in the middle of the water conduit 37. The chemical solution injector 42 includes a flow rate detection unit 43 and a chemical solution feeding unit 44. The flow rate detection unit 43 includes a rotor blade (not shown) with a magnet, and the rotor blade with the magnet rotates according to the amount of water flowing through the water conduit 37 and reads a pulse generated by the movement of the magnet according to the rotation. The flow rate is detected.

  A chemical liquid injection part 45 is provided in the middle of the flow path a on the downstream side of the first switching valve 25, and a chemical liquid pressure feeding hose 46 led out from the chemical liquid pressure supply part 44 is connected to the chemical liquid injection part 45. Has been. Then, a chemical solution corresponding to the flow rate detected by the flow rate detection unit 43 is sent from the chemical solution feeding unit 44 to the chemical solution injection unit 45 through the hose 46, and from the chemical solution injection unit 45 to the raw water flowing through the flow path a. A chemical solution is injected.

  Next, the effect | action of this water purifier is demonstrated.

(Purification operation)
During normal purification operation, the inlet 16 communicates with the outlet 17, and the second inlet 18 communicates with the purified water discharge port 19. In this state, the pumping pump 33 is driven under the control of a control unit (not shown). The pumping pump 33 pumps up raw water (well water) in the well 30 and sends it to the inlet 16 of the valve device 15 through the water supply pipe 31. The raw water sent to the inflow port 16 is sent to the inflow pipe 4 of the filtration tank 1 through the flow path a, and further sprinkled into the filtration tank 1 through the water spray pipe 7. When the raw water flows through the flow path a, the chemical solution is injected from the chemical solution injection unit 45 into the raw water.

  The raw water sprayed into the filter tank 1 passes through the filter medium 2 and reaches the inner bottom of the filter tank 1. When the raw water passes through the filter medium 2, impure components such as iron and manganese contained in the raw water are captured and removed by the filter medium 2, and the raw water becomes clear purified water.

  The purified water that has been purified flows into the guide pipe 8 through the filter 10, is sent from the guide pipe 8 to the flow path b through the outflow pipe 5, and is further sent from the discharge port 19 to the water supply facility 36 through the water conduit 37. Used for applications. When the purified water flows through the water conduit 37, the flow rate is detected by the flow rate detection unit 43 of the chemical solution injection device 42, and an amount of the chemical solution corresponding to the flow rate is supplied from the chemical solution feeding unit 44 to the chemical solution injection unit 45 through the hose 46. It is sent and injected into the raw water flowing through the flow path a.

  The flow rate detection unit 43 of the chemical solution injector 42 is provided in the middle of the water conduit 37 through which the purified water that has passed through the filtration tank 1 and from which foreign matters such as iron and hardness components have been removed flows. Foreign matter does not adhere to or adhere to the rotor blades of the detection unit 43, and therefore, it is possible to prevent inconveniences such as obstructing or stopping the rotation of the rotor blades, and always responding to the flow rate in the raw water flowing through the flow path a. The appropriate amount of chemical solution can be injected.

  When the clear purified water purified in the filtration tank 1 is supplied to the water supply facility 36 through the conduit pipe 37, a part of the purified purified water is introduced into the water storage tank 38 through the branch pipe 34 and stored so as to always maintain a constant level. Is done.

  As the purification operation continues, impure components such as iron and manganese are gradually accumulated in the filter medium 2. The amount of impure components accumulated in the filter medium 2 is detected, for example, when the control unit measures the purification operation time. Then, when the accumulated amount of impure components reaches a certain amount and is detected by the control unit, the purification operation is switched to the backwash operation based on a signal from the control unit.

(Backwash operation)
During the backwash operation, first, the valve paths of the first, second, and third switching valves 25, 26, and 27 are switched based on signals from the control unit. That is, the valve path of the first switching valve 25 is switched so that the water conduit 39 of the water storage tank 38 communicates with the flow path a, and the valve path of the second switching valve 26 so that the outlet 17 communicates with the flow path d. Is switched, and the valve path of the third switching valve 27 is switched so that the flow path a leads to the second inlet 18 via the flow path c. Then, the water pump 33 is stopped and the water supply pump 40 is driven.

  Purified clarified water in the water storage tank 38 is sent from the first switching valve 25 to the flow path a by driving the water supply pump 40, and this clarified water further passes through the flow path c and the third switching valve 27 to the second. It is sent from the inlet 18 to the outflow pipe 5 of the filtration tank 1. The clarified water sent to the outflow pipe 5 passes through the guide pipe 8 and is jetted from the filter 10 to the inner bottom of the filtration tank 1. The jetted clear water flows from the lower layer of the filter medium 2 toward the upper layer and flows into the sprinkling pipe 7.

  Thus, at the time of backwashing operation, the clarified water flows so as to flow backward from the lower layer of the filter medium 2 to the upper layer, contrary to the time of the purification operation, and the filter medium 2 is rinsed with the clarified water, and most of the impure components. Are separated and removed. The clarified water becomes impure due to the inclusion of impure components, and this sewage flows into the water spray pipe 7 and is further discarded from the backwash water discharge port 21 through the second switching valve 26 and the flow path d from the outlet 17. It is discharged to the outside as water and discarded in a predetermined disposal unit.

  At this time, water does not flow through the water guide pipe 37 in which the flow rate detection unit 43 of the chemical solution injection device 42 is disposed. Therefore, the flow rate detection unit 43 does not detect the flow rate, and no chemical solution is injected from the chemical solution injection unit 45. This backwash operation is performed for a predetermined time under the control of the control unit. And after predetermined time passes, it switches to cleaning operation by control by a control part.

(Washing operation)
During the cleaning operation, the flow path a is again communicated with the outlet 17 by switching the valve path of the second switching valve 26, and the second inlet 18 is again switched to the flow path b by switching the valve path of the third switching valve 27. And the valve path of the fourth switching valve 28 is switched so that the flow path b communicates with the flow path e. And the drive of the water supply pump 40 of the water storage tank 38 is continued, The purified water in the water storage tank 38 is sent to the flow path a from the 1st switching valve 25 by this water supply pump 40, This clear water is further 1st. 2 is sent to the inflow pipe 4 of the filtration tank 1 through the switching valve 26, sprayed into the filtration tank 1 through the sprinkling pipe 7, and further passed through the filter medium 2 to the inner bottom of the filtration tank 1, and from the guide pipe 8. It is sent to the outflow pipe 5. The clarified water sent to the outflow pipe 5 passes through the third switching valve 27 from the second inlet 18 and further flows into the flow path e from the fourth switching valve 28, and is discharged as waste water from the washing water discharge port 22. Are discharged to a predetermined disposal unit.

  Thus, the clarified water flows in the forward direction, so that the filter medium 2 in the filter tank 1 is finally washed. At this time, water does not flow through the water guide pipe 37 in which the flow rate detection unit 43 of the chemical solution injection device 42 is disposed. Therefore, the flow rate detection unit 43 does not detect the flow rate, and no chemical solution is injected from the chemical solution injection unit 45.

  After the cleaning operation, the flow path e is closed by the control of the control unit, the valve path of the fourth switching valve 28 is switched so that the flow path b communicates with the purified water discharge port 19, and the passage of the water storage tank 38 is performed. The passage from the water pipe 39 to the flow path a is closed, and the valve path of the first switching valve 25 is switched so that the water supply pipe 31 of the well 30 communicates with the flow path a. Then, the water supply pump 40 is stopped, the water pump 33 in the well 30 is driven, and the above-described normal purification operation is performed.

  As described above, in the present embodiment, the flow rate detection unit 43 of the chemical liquid injector 42 is provided on the secondary side of the filtration tank 1, that is, in the middle of the water conduit 37 through which the purified water purified by the filtration tank 1 passes. Therefore, the raw water pumped from the well 30 does not pass through the flow rate detection unit 43, so iron in the raw water adheres to the rotor blades with magnets of the flow rate detection unit 43, and the hardness component adheres to the rotation unit. The inconvenience that the rotation of the rotor blade is obstructed or stopped can be prevented, the flow rate is detected without error, and an appropriate amount of the chemical solution can always be injected into the raw water before flowing into the filtration tank 1.

  Thus, at the time of the backwash operation and the washing operation, water does not flow into the water conduit 37 and the flow rate detection unit 43 does not detect the flow rate, so that no chemical solution is injected. Since clear water that has already been purified is used as the treatment water, there is no problem even if it is introduced into the filtration tank 1 without injection of the chemical solution.

  Further, during the back washing operation and during the washing operation, the clarified water in the water storage tank 38 is used as the treated water, and since this clarified water sequentially passes through the chemical solution injection part 45, the iron content and hardness components that are precipitated during the purification operation, etc. Even if the foreign matter adheres to the small-diameter hole for injecting the chemical solution in the chemical injection portion 45, the foreign matter can be removed by cleaning with clear water during backwashing or washing operation. Can prevent clogging of holes.

  By the way, since an automatic operation pump unit with a water storage tank that is integrally provided with the water storage tank 38 and the water supply pump 40 shown in FIG. 2 is generally commercially available, the automatic operation pump unit with a water storage tank is assembled to the first switching valve 25. And the automatic operation pump unit can be driven to perform the backwashing operation and the washing operation as described above. In this case, the local piping can be easily made into a compact water purifier. In addition, since the water amount required for the backwashing operation and the washing operation may be stored in the water tank, the water tank can be made small.

  This automatic operation pump unit with a water tank detects the pressure drop on the discharge side, starts the pump, and stops automatically when the flow rate on the discharge side decreases, so it outputs a start / stop signal from the control unit of the water purifier Without switching, it is possible to automatically switch to the backwash operation.

  Further, the cleaning water discharge port 22 of the purification device is connected to the water storage tank of the automatic operation pump unit with the water storage tank, and the cleaning water discharged from the cleaning water discharge port 22 during the cleaning operation is sent to the water storage tank for replenishment. It is also possible to configure as described above.

  In this case, the washing water at the time of the washing operation can be effectively used as the treated water at the time of the washing operation and the treated water at the time of the back washing operation without wasting waste. The iron / manganese concentration in the wash water discharged from the wash water outlet 22 immediately after the start of the washing operation exceeds the water quality standard, but the time is very short, and after a certain period of time, it is almost equivalent to clarified water. There is no problem even if the water is used as backwashing treatment water or washing treatment water.

  FIG. 3 shows the configuration of the water purifier according to the second embodiment of the present invention. In this embodiment, the flow rate detector 43 of the chemical liquid injector 42 is provided in the middle of the water conduit 37 that is the secondary side of the filtration tank 1, and the fourth switching valve that switches the valve path during the cleaning operation. 28 is provided on the secondary side of the flow rate detection unit 43, that is, in the middle of the water conduit 37 between the flow rate detection unit 43 and the water supply equipment 36, and the other parts are the same as in the case of the first embodiment. It has become.

  In the case of this embodiment, as in the case of the first embodiment, the raw water pumped from the well 30 by the pumping pump 33 is sent into the filtration tank 1 during the purification operation. The raw water passes through the filter medium 2 to become purified water, and the purified water is sent from the discharge port 19 to the water supply facility 36 through the water conduit 37. Moreover, at the time of backwashing operation, the purified water in the water storage tank 38 is sent into the filtration tank 1 so as to flow backward from the outflow pipe 5 by driving the water supply pump 40 and passes through the filter medium 2 while stirring. It flows into the flow path d and is discharged from the backwash water discharge port 21 to the outside.

  On the other hand, at the time of the cleaning operation, the purified water in the water storage tank 38 is sent in the forward direction in the filtration tank 1 through the flow path a by continuing the drive of the water supply pump 40, and after passing through the filter medium 2, the second It is sent from the inflow port 18 to the water conduit 37 through the third switching valve 27, further flows into the flow path e by switching the valve path of the fourth switching valve 28, and is discharged to the outside from the cleaning water discharge port 22.

  Thus, in the case of the second embodiment, water flows through the water conduit 37 during the cleaning operation. And since the flow volume detection part 43 of the chemical | medical solution injection apparatus 42 is arrange | positioned in the upstream of the 4th switching valve 28, the water which flows into the water conduit 37 passes the flow volume detection part 43. FIG.

  The iron / manganese concentration of water flowing in the water conduit 37 immediately after the start of the washing operation exceeds the water quality standard, but the time is very short, and after a certain period of time, it is almost the same as the clarified water. There is no problem even if it passes through the part 43, and even if foreign matter such as iron or manganese adheres to the rotor blades or the rotating part of the flow rate detection part 43 immediately after the start of the cleaning operation, the attached foreign matter is not removed by the subsequent clarified water. It is washed away and does not become a problem.

Sectional drawing which shows the filtration tank of the water purifier which concerns on 1st Embodiment of this invention. Explanatory drawing which shows the water flow path of the water purifier. Explanatory drawing which shows the water flow path in the 2nd water purifier of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Filtration tank 2 ... Filter medium 4 ... Inflow pipe 5 ... Outflow pipe 7 ... Sprinkling pipe 8 ... Guide pipe 9 ... Connection pipe 10 ... Filter 15 ... Electric valve apparatus 16 ... Inlet 17 ... Outlet 18 ... Second flow Inlet 19 ... Purified water discharge port 21 ... Backwash water discharge port 22 ... Wash water discharge port 25 ... First switching valve 26 ... Second switching valve 27 ... Third switching valve 28 ... Fourth switching valve 30 ... Well 31 ... Water supply pipe 33 ... Pumping pump 34 ... Branch pipe 36 ... Water supply equipment 37 ... Water transfer pipe 38 ... Water storage tank 39 ... Water pipe 40 ... Water supply pump 42 ... Water solution injection device 43 ... Flow rate detection unit 44 ... Chemical solution pressure sending unit 45 ... Chemical injection part 46 ... hose

Claims (3)

A filtration tank having an inflow pipe and an outflow pipe and containing a filter medium inside;
The raw water pumped up from a water source such as a well is supplied from the inflow pipe into the filtration tank through the first switching valve and the second switching valve, and then passed through the filter medium, so that the raw water is discharged as clear purified water. Purification operation means for flowing out of the pipe and supplying the predetermined water supply equipment and water storage tank through the third switching valve and the fourth switching valve;
A chemical injection device for injecting a chemical solution for oxidation and sterilization into the raw water pumped up from a water source such as a well;
When the filter medium in continuous purification operation contaminated above a certain by the cleaning operation unit, the first through the fourth switching valve is switched operation, a clear water in the water tank, the first switch Backwashing operation means for supplying a backflow from the outflow pipe into the filtration tank through the valve and a third switching valve, allowing the outflow from the inflow pipe and discharging to the outside through the second switching valve;
After the backwash operation by the backwash operation means, the second and third switching valves are switched to supply the clear water in the water storage tank so as to flow in the forward direction from the inflow pipe into the filtration tank. And a washing operation means for causing the liquid to flow out from the outflow pipe and to be discharged to the outside through the fourth switching valve,
The chemical solution injector includes a flow rate detection unit and a chemical solution injection unit, and the flow rate detection unit is disposed in the middle of a flow path leading from the outflow pipe of the filtration tank to the water supply facility, and flows in the flow path. The flow rate is detected, and the chemical injection unit is arranged on the downstream side of the first switching valve, and the amount of water according to the amount of water detected by the flow rate detection unit is reduced in the raw water flowing out from the first switching valve. A water purifier characterized by injecting a chemical solution.   The flow rate detection unit of the chemical injection device is disposed in the middle of a flow path leading from the outflow pipe of the filtration tank to the water supply facility and downstream of the fourth switching valve. 1. The water purifier according to 1.   The flow rate detection unit of the chemical liquid injector is disposed in the middle of a flow path leading from the outflow pipe of the filtration tank to the water supply facility and upstream of the fourth switching valve. 1. The water purifier according to 1.

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