JP6617281B2 - Water treatment equipment - Google Patents

Description

  The present invention relates to a water treatment apparatus for small-scale facilities, which relates to a water treatment apparatus that purifies water by removing turbid components contained in well water, river water, rainwater, tap water, and the like. is there.

As a water purification device for purifying various raw water such as sewage, various waste water, irrigation water, seawater, a filtration device is raised. For filtration, sand, fibers, membranes, and the like are used as filter media, and the turbid components in the raw water are removed by the sieving effect and adsorption effect generated between the turbid components in the raw water and the filter media. In order to more effectively purify water, conventionally, this type of filtration device is generally added with chemicals into raw water, which is effective in improving the purification performance of water treatment and shortening the filtration time. . (For example, see Patent Document 1)
Examples of the agent to be added include a pretreatment agent such as an aggregating agent for aggregating fine particles contained in raw water and an oxidizing agent for insolubilizing dissolved components.

  Hereinafter, the water purification apparatus will be described with reference to FIG.

  As shown in FIG. 8, the water treatment apparatus 101 includes a pipe 102, an electric pump 103, a stirring tank 104, and a filtration tank 105, and the chemical stored in the chemical storage unit 106 is transferred to the stirring tank 104 by the chemical addition means 107. Added.

  In addition, some types of water treatment apparatuses of this type are adjusted in accordance with the state of the water to be treated. The chemical addition means 107 includes a mechanism that transmits information obtained from the measurement unit 108 that measures the state of water in the stirring tank to the control unit 109 and adjusts the amount of chemical added to the stirring tank 104.

Japanese Patent Laying-Open No. 2015-73942

  In such a conventional water treatment apparatus, the state of the measured water to be treated is electrically transmitted to the control unit, and the chemical addition amount is adjusted by a chemical injection pump or the like, and the electric control is performed. Since electric wiring for a mechanism and installation is required, the manufacturing cost of the water treatment apparatus was increased.

  Therefore, the present invention solves the above-described conventional problems, and an object thereof is to provide a water treatment device that measures the state of water to be treated and adjusts the addition amount of a chemical without requiring an advanced measurement device. And

In order to achieve this object, a water treatment apparatus according to the present invention is a water treatment apparatus for removing turbid components contained in water, and is used for sucking and discharging water from a well or a water tank. An electric pump, a filtration device enclosing a filter medium, a pipe for supplying water from the electric pump to the filtration apparatus, a bypass pipe for diverting from the pipe, and a flow rate control for controlling the amount of water introduced from the pipe to the bypass pipe And a chemical introduction unit that introduces a chemical into the water to be treated in the bypass pipe and returns the chemical to the pipe, the chemical injection part is connected to a bypass pipe, and the flow rate control unit controls the flow rate in the pipe. to control the introduction amount of water into the bypass pipe according to a water treatment apparatus which causes discharging a drug from the drug-on unit according to the introduction amount of water into the bypass pipe, the flow control unit, the bypass pipe and the pipe With An opening valve that opens and closes the opening, an action part that receives a force due to the flow of the water to be treated flowing in the pipe, and an elastic body that moves the expansion valve according to the magnitude of the force that the action part receives And the amount of water introduced from the pipe into the bypass pipe is controlled by the amount of movement of the opening valve in accordance with the flow rate of the water to be treated in the pipe. Is achieved.

Further, in a water treatment apparatus for removing turbid components contained in water, an electric pump for sucking and discharging water from a well or a water tank, a filtration apparatus enclosing a filter medium, and an electric pump A pipe that feeds water from the pipe to the filtration device, a bypass pipe that diverts from the pipe, a flow rate control unit that controls the amount of water introduced from the pipe to the bypass pipe, and a chemical to the treated water in the bypass pipe, A chemical injection section that returns to the pipe, the chemical injection section is connected to a bypass pipe, and the flow rate control section controls the amount of water introduced into the bypass pipe in accordance with the flow rate in the pipe, A water treatment apparatus for discharging a drug from a drug input unit according to the amount of water introduced into the flow rate, wherein the flow rate control unit is interlocked with the rotation of the flow rate detection gear rotated by the flow in the pipe and the flow rate detection gear. Time And a flow rate control gear that rotates in conjunction with the rotation of the flow rate transmission gear, and controls the amount of water introduced from the pipe into the bypass pipe based on the number of rotations of the flow rate control gear. Yes, and this achieves the intended purpose.

According to the present invention, in a water treatment apparatus for removing turbid components contained in water, an electric pump for sucking and discharging water from a well or a water tank, and a filtration apparatus enclosing a filter medium, A pipe for feeding water from the electric pump to the filtration device, a bypass pipe for diverting from the pipe, a flow rate control unit for controlling the amount of water introduced from the pipe to the bypass pipe, and a chemical to the water to be treated in the bypass pipe A chemical injection unit that is charged and returned to the pipe, the chemical injection unit is connected to a bypass pipe, and the flow rate control unit controls the amount of water introduced into the bypass pipe according to the flow rate in the pipe, A water treatment device that discharges a drug from a drug input unit according to the amount of water introduced into the bypass pipe , wherein the flow rate control unit is an opening valve that opens and closes a conduction port between the pipe and the bypass pipe, Flow in the pipe An action part that receives a force due to the water flow of the water to be treated, and an elastic body that moves the expansion valve according to the magnitude of the force received by the action part, and the flow rate of the water to be treated in the pipe Since the amount of water introduced from the pipe into the bypass pipe is controlled by the amount of movement of the opening valve according to the amount, the amount of water to be treated corresponding to the flow rate in the pipe is introduced into the bypass pipe. The treated water is discharged at a constant chemical concentration at the chemical input part, returns to the inside of the pipe, and is mixed with the water to be treated flowing in the pipe. It is possible to obtain the effect that it can be input with

Further, in a water treatment apparatus for removing turbid components contained in water, an electric pump for sucking and discharging water from a well or a water tank, a filtration apparatus enclosing a filter medium, and an electric pump A pipe that feeds water from the pipe to the filtration device, a bypass pipe that diverts from the pipe, a flow rate control unit that controls the amount of water introduced from the pipe to the bypass pipe, and a chemical to the treated water in the bypass pipe, A chemical injection section that returns to the pipe, the chemical injection section is connected to a bypass pipe, and the flow rate control section controls the amount of water introduced into the bypass pipe in accordance with the flow rate in the pipe, A water treatment apparatus for discharging a drug from a drug input unit according to the amount of water introduced into the flow rate, wherein the flow rate control unit is interlocked with the rotation of the flow rate detection gear rotated by the flow in the pipe and the flow rate detection gear. Time And a flow rate control gear that rotates in conjunction with rotation of the flow rate transmission gear, and controls the amount of water introduced from the pipe into the bypass pipe based on the number of rotations of the flow rate control gear. As a result, an amount of water to be treated corresponding to the flow rate in the pipe is introduced into the bypass pipe, and the introduced water to be treated is discharged in a state where the chemical concentration is constant at the chemical inlet, and returns to the pipe. Since it is mixed with the water to be treated flowing inside, it is possible to obtain an effect that the medicine can be introduced in an optimum amount by means that does not require power control.

The schematic diagram which shows the water treatment apparatus of Embodiment 1 of this invention. The schematic diagram which shows the chemical | medical agent injection part periphery of the water treatment apparatus of Embodiment 2 of this invention The schematic diagram which shows the chemical | medical agent injection part periphery of the water treatment apparatus of Embodiment 3 of this invention The schematic diagram which shows the chemical | medical agent injection part periphery of the water treatment apparatus of Embodiment 4 of this invention The schematic diagram which shows the flow control part of the water treatment apparatus of Embodiment 5 of this invention. The schematic diagram which shows the flow control part of the water treatment apparatus of Embodiment 6 of this invention. The schematic diagram which shows the chemical | medical agent injection part periphery of the water treatment apparatus of Embodiment 7 of this invention Schematic diagram showing a conventional water treatment device

A water treatment device according to claim 1 of the present invention is a water treatment device for removing turbid components contained in water, an electric pump for sucking and discharging water from a well or a water tank, and a filter medium A filtration device that encloses water, a pipe that feeds water from the electric pump to the filtration device, a bypass pipe that diverts from the pipe, a flow rate control unit that controls the amount of water introduced from the pipe to the bypass pipe, and the inside of the bypass pipe A chemical injection unit that introduces a chemical into the water to be treated and returns it to the pipe, the chemical injection unit is connected to a bypass pipe, and the flow rate control unit enters the bypass pipe according to the flow rate in the pipe. Is a water treatment device that controls the amount of water introduced and discharges the medicine from the medicine input section according to the amount of water introduced into the bypass pipe , wherein the flow rate control section opens and closes a conduction port between the pipe and the bypass pipe Do the opening valve An action part that receives a force due to a flow of water to be treated flowing in the pipe, and an elastic body that moves the expansion and contraction valve according to the magnitude of the force that the action part receives. The amount of water introduced from the pipe into the bypass pipe is controlled by the amount of movement of the opening valve according to the flow rate of the water to be treated . As a result, an amount of water to be treated corresponding to the flow rate in the pipe is introduced into the bypass pipe, and the introduced water to be treated is discharged in a state where the chemical concentration is constant at the chemical inlet, returns to the pipe, and passes through the pipe. Since it is mixed with the flowing water to be treated, there is an effect that the chemical can be introduced in an optimum amount by means that does not require power control regardless of the flow rate of the treated water in the pipe.

The water treatment device according to claim 2 is a water treatment device for removing turbid components contained in water. An electric pump for sucking and discharging water from a well or a water tank, and a filter medium. An enclosed filtration device, a pipe for supplying water from the electric pump to the filtration device, a bypass pipe for diverting from the pipe, a flow rate control unit for controlling the amount of water introduced from the pipe to the bypass pipe, and the inside of the bypass pipe A chemical injection unit that introduces a chemical into the water to be treated and returns it to the pipe, the chemical injection unit is connected to a bypass pipe, and the flow rate control unit enters the bypass pipe according to the flow rate in the pipe. Is a water treatment device that controls the amount of water introduced and discharges the medicine from the medicine input section according to the amount of water introduced into the bypass pipe, the flow rate control section comprising a flow rate detection gear that rotates according to the flow in the pipe, The flow A flow rate transmission gear that rotates in conjunction with the rotation of the detection gear, and a flow rate control gear that rotates in conjunction with the rotation of the flow rate transmission gear, and from the pipe into the bypass pipe based on the rotational speed of the flow rate control gear It controls the amount of water introduced into the water. Thereby, since the rotation speed of the flow rate detection gear is determined by the treated water flow rate in the pipe, it is possible to control the treated water flow rate introduced into the bypass pipe according to the flow rate in the pipe. The introduced treated water is discharged in a state where the chemical concentration is constant at the chemical input part, returns to the inside of the pipe, and is mixed with the treated water flowing in the pipe, so regardless of the treated water flow rate in the pipe, There is an effect that the medicine can be introduced in an optimum amount by means that does not require power control.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

(Embodiment 1)
As shown in FIG. 1, the water treatment device 1 includes an electric pump 3 connected to a pipe 2 connected to a well or a water tank, and a filtration device 4 connected downstream of the electric pump 3. On the pipe 2 that feeds water from the electric pump 3 to the filtration device 4, there are a bypass pipe 5 that connects an upstream part upstream from the medicine charging part 7 and a downstream part downstream from the chemical charging part 7, and a pipe 2 and a bypass pipe 5. A flow rate control unit 6 that controls the amount of water introduced into the bypass pipe 5 and an agent introduction unit 7 that introduces the chemical into the water to be treated introduced into the bypass pipe 5 are provided in the upstream connection part.

  According to such a configuration, the bypass pipe 5 that connects the upstream portion upstream of the drug injection section 7 and the downstream section downstream of the drug input section 7 of the pipe 2, and the flow rate control section that controls the amount of water introduced into the bypass pipe 5. 6 and the chemical introduction unit 7 for introducing the chemical into the water to be treated in the bypass pipe 5, an amount of water to be treated corresponding to the flow rate in the pipe 2 is introduced into the bypass pipe 5. The treated water is configured such that the chemical is introduced into the chemical introduction unit 7 and returns to the pipe 2 after reaching a certain chemical concentration. For this reason, the chemical | medical agent can be injected | thrown-in by the optimal quantity by the means which does not require electric power control irrespective of the treated water flow rate in the piping 2. FIG.

  The filtration device 4 constituting the water treatment device is a container in which a filter medium 8 is enclosed. If the filter medium 8 is a filter medium generally used for water purification by filtration, such as sand, fiber, filter, etc. Not limited to.

  At the time of water treatment, raw water is introduced into the filtration device 4 by the electric pump 3. The amount of raw water introduced into the filtration device 4 by the flow rate adjusting valve 9 is adjusted. When the raw water passes between the filter media 8, the turbid components in the raw water are adsorbed on the surface of the filter media 8 to purify the water. It is discharged outside. At this time, since fine particles and ionic substances are difficult to adsorb on the surface of the filter medium 8 and may be difficult to purify, a high purification effect can be obtained by adding a chemical before filtration. A flocculant and an oxidizing agent are used as chemicals added to enhance the purification effect in filtration. The flocculant is added to agglomerate fine particles to facilitate adsorption to the filter medium. As the flocculant, polyaluminum chloride (PAC), sulfuric acid band, polysilica iron (PSI), etc. are used. It will not be restricted to these as long as it exhibits an effect. Oxidizing agents are added to insolubilize ionic substances and facilitate adsorption on filter media. As oxidizing agents, sodium hypochlorite, chlorine, ozone, etc. are used, and they exhibit the above effects. If there is, it is not restricted to these.

  The connection of each component is not limited to either a direct connection or a method performed via the pipe 2, but it is preferable to determine a connection method in consideration of the arrangement and operability of each component. . Moreover, you may install members, such as a valve | bulb, a branch, and an elbow, in the middle of the piping 2 as needed.

  The pipe 2 to be used may be any material and structure that can withstand the water pressure of the electric pump 3, but from the viewpoint of durability and ease of processing, for example, a vinyl chloride resin, a steel pipe, or a composite material thereof is used. A straight pipe can be used. The nominal diameter is preferably large so that the loss head is low, for example, 15 to 50 millimeters and the thickness is preferably about 1 to 5 millimeters.

  The electric pump 3 is a pump driven by an electric motor for sucking and discharging groundwater from a well or a water tank. For example, a centrifugal pump such as a spiral pump, a jet pump, a cascade pump, an axial flow pump, a mixed flow pump, or the like There is. When used in general households, the depth of the well should be about 10 to 20 meters for shallow wells and 20 to 30 meters or more for deep wells. In consideration, a pump having a head of 20 meters or more is preferable, and a centrifugal pump such as a spiral pump or a jet pump is more preferable.

  Further, the pump includes a non-automatic pump that operates with a power switch, or an automatic pump that includes a pressure filtration device and a pressure switch and automatically operates when the pressure falls below a predetermined pressure. Any pump can be used. The flow rate discharged by the electric pump 3 is, for example, about 5 liters to 50 liters per second. For general household use, the flow rate is about 5 liters to 15 liters per second. Is preferred.

(Embodiment 2)
FIG. 2 shows a detailed structure around the bypass pipe 5, the flow rate control unit 6, and the medicine charging unit 7 in FIG. 1 of the first embodiment.

  2, the same components as those in FIG. 1 are denoted by the same reference numerals, and detailed description thereof is omitted.

  In FIG. 2, the chemical | medical agent injection | throwing-in part 7 consists of the space where the to-be-processed water introduce | transduced from the upstream of the bypass pipe 5 stays for a definite period of time. A solid medicine 10 that is a pretreatment medicine is enclosed in the medicine feeding section 7, and the solid medicine 10 is dissolved to a saturated concentration while the water to be treated is retained in the medicine feeding section 7. Yes. In the above configuration, by introducing the water to be treated introduced into the bypass pipe 5 into the chemical charging unit 7, the solid chemical 10 is dissolved to a saturated concentration, and the chemical concentration of the water to be treated discharged from the chemical charging unit 7 is Since it becomes constant and is mixed with the water to be treated flowing in the pipe 2, the chemical concentration in the bypass pipe 5 can be kept constant with a simple configuration that does not require complicated chemical input control.

  The solid drug 10 preferably has a high dissolution rate and a low saturation concentration, and examples thereof include calcium hypochlorite and chlorinated isocyanuric acid. However, the solid drug 10 is not limited to these as long as it achieves the above configuration.

(Embodiment 3)
FIG. 3 shows a detailed structure around the bypass pipe 5, the flow rate control unit 6, and the medicine charging unit 7 in FIG.

  In the above configuration, the solid medicine 10 is enclosed in the medicine loading section 7 in a fixed state, and the solid medicine 10 and the solid medicine 10 are treated so that the dissolution of the medicine is completed to the saturated concentration within the residence time. The contact area of water is equal to or greater than the saturated dissolution contact area. Here, the saturated dissolution contact area is determined by the residence time and the type of the solid drug 10, and the residence time is determined by the processing amount of the water treatment device 1 and the space volume of the drug charging unit 7. Since the saturated dissolution contact area is determined by the combination of the residence time and the type of the solid drug 10, it is necessary to calculate in advance when designing the water treatment apparatus.

In the above-described configuration, the dissolution of the drug can be continued for a long time at the contact area at the beginning of the operation, so that the replenishment frequency of the amount of the drug necessary for dissolving to the saturated concentration can be reduced.
The configuration in which the contact area is equal to or greater than a specified value is, for example, a method for increasing the specific surface area of the solid drug 10, and a fixing method for increasing the specific surface area of the solid drug 10 is water-soluble as shown in FIG. Examples include a configuration in which a carrier such as a polymer and a drug are mixed and coated and fixed in a state where the drug can be dissolved on the entire wall surface in the drug input portion. However, the configuration is not limited to this as long as the above effect is achieved.

(Embodiment 4)
FIG. 4 shows a detailed structure around the bypass pipe 5, the flow rate control unit 6, and the medicine charging unit 7 in FIG.

  In the above configuration, the solid medicine 10 is enclosed in the medicine charging section 7 in a state of flowing in the medicine charging section 7. The solid drug 10 is a drug formed into a spherical shape by mixing a carrier such as a water-soluble polymer and a drug, and the dissolution is promoted by flowing in the drug charging unit 7.

  In addition, the solid chemical 10 is dissolved to a saturated concentration while the water to be treated is retained in the chemical charging section 7.

  The solid drug 10 is configured such that the amount of the solid drug 10 input is equal to or greater than the saturation dissolution input so that the drug dissolution is completed to the saturated concentration within the residence time. Here, the saturated dissolution input amount is determined by the residence time and 10 types of solid chemicals, and the residence time is determined by the processing amount of the water treatment device 1 and the space volume of the chemical injection unit 7, so that the water treatment When designing the device 1, it is necessary to calculate in advance.

  In the above configuration, the stirring effect due to the flow of the solid medicine 10 in the space promotes the dissolution of the medicine and shortens the residence time in the medicine feeding section. Can be small. As a configuration in which the solid drug 10 is not fixed, for example, a granular drug or the like is sealed in the drug charging unit, and the water to be treated introduced into the bypass pipe 5 is introduced from below the drug charging unit 7, Although the structure etc. in which the solid chemical | medical agent 10 deposited under the chemical | medical agent injection | throwing-in part 7 flows with a water flow etc. are mentioned, if it is a structure which achieves the said effect, it will not restrict to this.

(Embodiment 5)
FIG. 5 shows a detailed structure of the flow rate control unit 6 in FIG. 1 of the first embodiment.

  The flow rate control unit 6 includes an action part 11 that receives a force caused by the water flow of the water to be treated that flows in the pipe 2, and an opening valve 12 that opens and closes a conduction port between the pipe 2 and the bypass pipe 5 in conjunction with the action part 11. The opening portion 12 is configured to move by the expansion and contraction of the elastic body 13. According to such a configuration, the magnitude of the force received by the action portion 11 due to the flow rate of the water to be treated can be converted into the movement amount of the opening valve 12. For this reason, the amount of water to be treated flowing into the bypass pipe can be controlled with a simple structure that does not require power control.

  Here, the force due to the water flow of the water to be treated is a hydrodynamic interaction between the structure installed in the fluid and the fluid, and the action part 11 that is a structure in the fluid is from the water to be treated as the fluid. It is the resistance that is received.

(Embodiment 6)
FIG. 6 shows a detailed structure of the flow rate control unit 6 in FIG. 1 of the first embodiment.

  In FIG. 6, the flow rate control unit 6 includes a flow rate detection gear 14 that rotates according to the flow rate in the pipe 2, a flow rate transmission gear 15 that rotates in conjunction with the rotation of the flow rate detection gear 14, and the flow rate transmission gear 15. The flow control gear 16 rotates in conjunction with the rotation, and the pipe 2 and the bypass pipe 5 are partitioned by the flow transmission gear 15 and the flow control gear 16. The water to be treated is introduced from the pipe 2 to the bypass pipe 5 by the flow control gear 16. The flow rate detection gear 14 rotates in the direction of arrow A due to the flow of the water to be treated, and the flow rate control gear 16 rotates in the direction of arrow B.

  According to this configuration, the water to be treated introduced from the pipe 2 to the bypass pipe 5 is filled between the teeth of the flow control gear 16, and on the outer wall 17 of the bypass pipe 5 as the gear of the flow control gear 16 rotates. It moves along and is carried to the bypass pipe 5. The rotational speed of the flow rate control gear 16 is controlled by the rotational speed of the flow rate transmission gear 15, and the rotational speed of the flow rate transmission gear 15 is controlled by the flow rate detection gear 14. Since the rotational speed of the flow rate detection gear 14 is determined by the flow rate of water to be treated in the pipe 2, the flow rate of water to be treated introduced into the bypass pipe 5 can be controlled according to the flow rate in the pipe 2. For this reason, the amount of water to be treated introduced into the bypass pipe 5 can be changed by changing the space volume between the teeth of the flow control gear 16, and the treatment to be introduced into the bypass pipe 5 accompanying the change in the type of the medicine. When the water ratio is changed, the water volume can be changed by exchanging the flow rate detection gear 14, the flow rate transmission gear 15 and the flow rate control gear 16 with different space volumes between the teeth.

(Embodiment 7)
FIG. 7 shows a detailed structure around the bypass pipe 5, the flow rate control unit 6, and the medicine injection unit 7 in FIG.

  In FIG. 7, a check valve 18 is installed in the bypass pipe 5 between the flow rate control unit 6 and the medicine charging unit 7. With this configuration, it is possible to prevent the backflow of the water to be treated introduced into the bypass pipe 5, so that the amount of inflow water in the bypass pipe 5 is stabilized and accurate chemical addition can be performed.

  The water treatment apparatus according to the present invention can be used in an optimal amount of chemicals by means that does not require power control, and thus is useful as a domestic water treatment apparatus used for purification of well water and stored water. It is.

DESCRIPTION OF SYMBOLS 1 Water treatment apparatus 2 Piping 3 Electric pump 4 Filtration apparatus 5 Bypass pipe 6 Flow control part 7 Drug injection part 8 Filter material 9 Flow control valve 10 Solid chemical | medical agent 11 Action part 12 Opening valve 13 Elastic body 14 Flow rate detection gear 15 Flow rate transmission gear 16 Flow control gear 17 Outer wall 18 Check valve

Claims (2)

In a water treatment device for removing turbid components contained in water,
An electric pump for sucking and discharging water from a well or water tank;
A filtration device enclosing a filter medium, piping for supplying water from the electric pump to the filtration device,
A bypass pipe for diverting from the pipe, a flow rate control unit for controlling the amount of water introduced from the pipe to the bypass pipe,
A chemical injection unit that supplies chemical to the water to be treated in the bypass pipe and returns to the pipe;
The medicine input part is connected to a bypass pipe,
The flow rate control unit is a water treatment device that controls the amount of water introduced into the bypass pipe according to the flow rate in the pipe, and discharges the drug from the drug input unit according to the amount of water introduced into the bypass pipe ,
The flow rate control unit includes an opening valve that opens and closes a conduction port between the pipe and the bypass pipe, an action part that receives a force caused by a flow of water to be treated flowing in the pipe, and a magnitude of the force that the action part receives. And an elastic body that moves the expansion valve according to the length, and controls the amount of water introduced from the pipe into the bypass pipe by the movement amount of the opening valve according to the flow rate of the treated water in the pipe Water treatment equipment. In a water treatment device for removing turbid components contained in water,
An electric pump for sucking and discharging water from a well or water tank;
A filtration device enclosing a filter medium, piping for supplying water from the electric pump to the filtration device,
A bypass pipe for diverting from the pipe, a flow rate control unit for controlling the amount of water introduced from the pipe to the bypass pipe,
A chemical injection unit that supplies chemical to the water to be treated in the bypass pipe and returns to the pipe;
The medicine input part is connected to a bypass pipe,
The flow rate control unit is a water treatment device that controls the amount of water introduced into the bypass pipe according to the flow rate in the pipe, and discharges the drug from the drug charging unit according to the amount of water introduced into the bypass pipe,
The flow rate control unit includes a flow rate detection gear that rotates according to a flow in the pipe, a flow rate transmission gear that rotates in conjunction with the rotation of the flow rate detection gear, and a flow rate control that rotates in conjunction with the rotation of the flow rate transmission gear. A water treatment device configured by a gear and controlling the amount of water introduced from the pipe into the bypass pipe based on the number of rotations of the flow control gear.