WO2021020138A1 - Water treatment device - Google Patents

Abstract

The water treatment device (1) has a filter unit (2) that contains a filter medium, a raw water inlet pipe (10) for raw water to flow into the filter unit (2), a chemical supply unit (3) that adds a chemical in the channel of the raw water inlet pipe (10), and a purified water discharge pipe (20) for removing filtered purified water from the filter unit (2). The location where the chemical is placed in the chemical supply unit (3) is disposed higher than the filter unit (2), the raw water inlet pipe (10), and the purified water discharge pipe (20) in the vertical direction in an installed state.

Description

Water treatment equipment

This disclosure relates to a water treatment device that purifies water by filtration.

Conventionally, a chemical supply device that brings a solid oxidant into contact with water has been used to supply the oxidant in the water treatment device. For example, in the case of purifying well water, it is possible to oxidize the raw water to be treated by using a chemical supply device that gradually dissolves solid calcium hypochlorite.

When a system that injects a drug with a metering pump or a drug supply device that elutes a certain amount of drug regardless of the flow rate is used as this drug supply device, the drug concentration decreases when the flow rate or pressure increases. Sometimes. For this purpose, a solid drug supply device having the following structure is used (for example, Patent Document 1).

FIG. 13 is a schematic view showing the configuration of the conventional solid drug supply device 101.

As shown in FIG. 13, the solid drug supply device 101 allows raw water to flow in from the intake port 102 to bring the raw water into contact with the water-soluble solid drug 103. Therefore, in the solid drug supply device 101, as the flow rate of the raw water increases, the water level in the drug contact phase 104 rises, so that the amount of the water-soluble solid drug 103 to be contacted can be increased. That is, according to this mechanism, in the solid drug supply device 101, even when the flow rate of raw water increases, the amount of drug elution increases, and it is possible to suppress a decrease in the concentration of the drug.

Jikken Sho 58-49863

In such a conventional solid drug supply device, when used for a long period of time, the solid oxidant adheres to the wall surface and does not come down to the position where the drug comes into contact with the raw water, so that the drug cannot be supplied to the raw water. Have. For example, when the flow rate flowing into the drug contact phase temporarily increases and reaches the upper end of the drug contact phase due to a sudden change in the flow path or the operating point of the pump, the oxidizing agent in the drug contact phase sticks. , The upper layer chemicals will not drop to the contact position between the raw water and the chemicals. As a result, there is a problem that the conventional solid drug supply device may not be able to supply a drug having a stable concentration to the raw water.

Therefore, an object of the present disclosure is to provide a water treatment device capable of stabilizing the drug concentration even when used for a long period of time.

The water treatment apparatus according to the present disclosure includes a filtration unit containing a filter medium, a raw water inflow pipe for inflowing raw water into the filtration unit, a chemical supply unit for adding a chemical in the path of the raw water inflow pipe, and filtration. It has a purified water discharge pipe for taking out purified water after filtration from the section, and the drug placement location in the drug supply section is located higher in the vertical direction than the filter section, raw water inflow pipe, and purified water discharge pipe in the installed state. It is placed.

The water treatment apparatus according to the present disclosure can stabilize the drug concentration even when used for a long period of time.

FIG. 1 is a schematic view showing the overall configuration of the water treatment apparatus according to the first embodiment of the present disclosure. FIG. 2 is a perspective view showing the internal structure of the water treatment apparatus. FIG. 3 is a cross-sectional view of the filtration portion of the water treatment apparatus. FIG. 4 is a schematic view showing the flow of water during the filtration treatment of the water treatment apparatus. FIG. 5 is a schematic view showing the flow of water during the backwashing treatment of the water treatment apparatus. FIG. 6 is a schematic view showing the flow of water during the rinsing treatment of the water treatment apparatus. FIG. 7 is a perspective view of the drug supply unit of the water treatment apparatus. FIG. 8 is a cross-sectional view of the drug supply section. FIG. 9A is a cross-sectional view of a main part of the drug supply section. FIG. 9B is an enlarged cross-sectional view of a main part of the drug supply section. FIG. 10 is a cross-sectional view of an air supply valve used in the water treatment apparatus. FIG. 11 is a side view showing the peripheral structure of the filtration portion of the water treatment apparatus. FIG. 12 is an exterior perspective view of the water treatment device. FIG. 13 is a schematic view showing the configuration of a conventional solid drug supply device.

The water treatment apparatus according to the present disclosure is composed of a filter unit containing a filter medium, a raw water inflow pipe for inflowing raw water into the filter unit, a chemical supply unit for adding a chemical in the route of the raw water inflow pipe, and a filter unit. It has a purified water discharge pipe for taking out purified water after filtration, and the chemical storage place in the chemical supply unit is arranged at a position higher in the vertical direction than the filtration unit, the raw water inflow pipe and the purified water discharge pipe in the installed state. It is a thing.

In the water treatment apparatus according to the present disclosure, since the drug storage place of the drug supply unit is provided at a position higher than other pipes and the filtration part in the installed state, air is introduced above the drug storage place. It can be in a state of being satisfied. Therefore, during the operation of the water treatment apparatus according to the present disclosure, only the lower part of the drug in the drug supply section is immersed in water, and when the water treatment device is stopped, the water can escape from the drug supply section to suppress the sticking of the drug. Therefore, the water treatment apparatus according to the present disclosure can stabilize the drug concentration even when used for a long period of time.

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

(Embodiment 1)
(overall structure)
The water treatment device 1 according to the present embodiment uses the water stored in the well water or the water source of the water tank as raw water, and performs a filtration treatment for removing metal ions and turbid components contained in the raw water, and a filtration treatment in the system. A backwash treatment is performed to discharge the accumulated metal ion aggregates and turbid components to the outside of the system.

First, the overall configuration of the water treatment device 1 according to the present embodiment will be described with reference to FIGS. 1 and 2. FIG. 1 is a schematic view showing the overall configuration of the water treatment device 1, and FIG. 2 is a perspective view showing the internal structure of the water treatment device 1.

For convenience of explanation, in the following, as shown in FIG. 2, the vertical direction (hereinafter, also simply referred to as “vertical”) in the state where the water treatment device 1 is installed (hereinafter, also referred to as “installed state”) is referred to. It may be described as the vertical direction.

As shown in FIGS. 1 and 2, the water treatment apparatus 1 has a filtration unit 2 containing a filter medium 2a (see FIG. 3) and a drug supply unit 3 for adding a drug to raw water, and the filtration unit 2 , The drug supply unit 3 is connected by a pipe as described later. Although the details will be described later, the filtration unit 2 purifies the raw water by removing metal ions and turbid components from the raw water, and is, so to speak, the heart of the water treatment device 1. The pipe on the side that sends raw water to the filtration unit 2 is the raw water inflow pipe 10, and the pipe that sends the water purified by the filtration unit 2 (hereinafter, also referred to as “purified water”) from the filtration unit 2 is the purified water discharge pipe 20. And. That is, the water treatment device 1 has a raw water inflow pipe 10 for inflowing raw water into the filtration unit 2, and a purified water discharge pipe 20 for taking out purified water after filtration from the filtration unit 2. In FIG. 1, the raw water inflow pipe 10 is indicated by diagonally hatched arrows, and the purified water discharge pipe 20 is indicated by grid-shaped hatched arrows. The purified water is stored in a water purification tank and used as domestic water when needed.

Raw water is sent to the water treatment device 1 by an electric pump 4 connected to the inlet side (opposite side of the filtration unit 2) of the raw water inflow pipe 10. The method of sending the raw water to the water treatment device 1 may be another method that does not use the electric pump 4. That is, the method of sending the raw water to the water treatment device 1 may be a method in which the water storage tank is provided at a high place and the raw water is sent to the water treatment device 1 depending on the height difference between the water storage tank and the water treatment device 1. Further, the method of sending raw water to the water treatment device 1 may be a method of directly connecting tap water jointly operated in a region or the like. The water source according to the present embodiment shall include devices for sending out raw water in addition to wells, water tanks, water supplies, and the like.

The electric pump 4 is a pump driven by an electric motor that sucks up and discharges well water or water stored in a water storage tank. For example, a centrifugal pump such as a vortex pump or a turbine pump, a vortex pump (cascade pump), a jet pump, etc. Axial flow pumps, mixed flow pumps, etc. are used. When used in a general household, the depth of the well needs to be about 1 to 10 meters for a shallow well and 10 to 30 meters or more for a deep well. Considering the piping in the subsequent stage and the head loss of the water treatment device 1, when the water treatment device 1 is used in a general household, the electric pump 4 should have a lift of 20 meters or more, such as a vortex pump or a jet pump. Is more preferable. Generally, the flow rate discharged by the electric pump is, for example, about 5 liters to 50 liters per minute, but when the water treatment device 1 is used in a general household, the electric pump 4 is 5 liters to 15 liters per minute. Those having a degree of flow rate characteristics are more preferable.

The raw water inflow pipe 10 and the purified water discharge pipe 20 may be made of a material and a structure that can withstand the water pressure of the electric pump 4. Specifically, from the viewpoint of durability and ease of processing, the raw water inflow pipe 10 and the purified water discharge pipe 20 are used, for example, vinyl chloride resin or steel pipe, or straight pipes or pipe joints using these composite materials. it can. The inner diameters of the raw water inflow pipe 10 and the purified water discharge pipe 20 are preferably large so as to reduce the head loss, for example, 13 mm to 50 mm, and preferably 1 mm to 5 mm in thickness.

The drug supply unit 3 is provided in the path of the raw water inflow pipe 10. As will be described in detail later, the chemical supply unit 3 adds an oxidizing agent, which is a chemical, to the raw water, aggregates the metal ions contained in the raw water as a substance poorly soluble in water, and collects them in the filtration unit 2. It works to make it easier.

(Filtration section)
Next, the configuration of the filtration unit 2 will be described with reference to FIG. FIG. 3 is a cross-sectional view of the filtration unit 2.

As shown in FIG. 3, the filtration unit 2 includes a tank 2b, a filter medium 2a filled inside the tank 2b, a distribution plug 2c for connecting a pipe to the tank 2b, and a lead-out pipe 2d for taking out purified water after filtration. Have. The tank 2b in the present embodiment is a substantially cylindrical container, and the bottom thereof is formed in a bowl shape (it does not have to be bowl-shaped). The distribution plug 2c is provided at the top of the tank 2b and communicates with the inside and outside of the filtration part 2. A water discharge port and a discharge pipe connection port are provided on the inner side of the distribution plug 2c, the outlet pipe connection port and the purified water discharge pipe 20 communicate with each other, and the raw water inflow pipe 10 and the water discharge port communicate with each other. Two pipes extend in the horizontal direction on the outer side of the distribution plug 2c, and each pipe is connected to the raw water inflow pipe 10 and the purified water discharge pipe 20. In the present embodiment, the two pipes extending outward from the distribution plug 2c are arranged substantially in a straight line and extend in the opposite direction from the center of the distribution plug 2c.

The lead-out pipe 2d is arranged so as to be substantially vertical inside the tank 2b, the upper end is connected to the lead-out pipe connection port of the distribution plug 2c, and the lower end is an open end near the bottom surface of the tank 2b. The lead-out pipe 2d is for discharging the filtered water from the lower side to the upper side during the filtration treatment, and may be a pipe having a small head loss and being difficult to block. For example, a straight pipe having a diameter of 20 mm or more can be used. The material is preferably one that is not easily corroded, and for example, resin or metal is preferable. As will be described in detail later, a lower strainer 2e is attached to the lower end of the lead-out pipe 2d so that the filter medium 2a and the like do not enter the lead-out pipe 2d.

As described above, the spout provided in the distribution tap 2c and the raw water inflow pipe 10 communicate with each other.

Raw water will flow into the filtration unit 2 from the spout. An upper strainer 2f is provided at the spout so as to cover the opening. The upper strainer 2f prevents the filter medium 2a from being discharged to the outside of the filtration unit 2 in the backwashing treatment described later.

The upper strainer 2f and the lower strainer 2e are arranged in order to prevent the filter medium 2a in the filtration unit 2 from flowing out from the filtration unit 2. That is, the upper strainer 2f is installed so as to cover the spout so that the filter medium 2a does not flow out from the filtration unit 2 during the backwashing treatment. The lower strainer 2e is installed so as to cover the opening at the lower end of the lead-out pipe 2d so that the filter medium 2a does not flow out from the filtration unit 2 during the filtration process. The upper strainer 2f and the lower strainer 2e may have a mesh shape, a slit shape, or the like, and may have a pore width of 0.3 to 1 mm or a gap smaller than that of the filter medium 2a. The material is preferably one that is not easily corroded like the lead-out pipe 2d, and for example, resin or metal is preferable.

The filter medium 2a included in the filtration unit 2 is the most basic member for exhibiting the performance of the water treatment device 1. The filter medium 2a is used to capture and remove coarse particles and agglomerates having a particle diameter of about 10 micrometers or more to reduce the turbidity of raw water. The filter medium 2a can remove particles having a surface potential that are adsorbed on the filter medium 2a, particles having a particle diameter of about 1 micrometer to 10 micrometers, and chromaticity depending on the presence of ions and the like in the raw water.

As the filter medium 2a, those suitable for the object to be removed, such as filtered sand and pelletized fiber filter media, can be used. The material of the filter medium 2a may be, for example, sand, anthracite, garnet, ceramics, granular activated carbon, iron oxyhydroxide, manganese sand, or the like, which has a hardness that does not easily deform under pressure. The particle size may be, for example, 0.3 mm to 5.0 mm, an equality coefficient 1.2 to 2.0, or the like.

In addition, the specific gravity of the filter medium 2a differs depending on the material. For example, in the case of sand, about 2.5 g per cubic centimeter, to 2.7 g per cubic centimeter, and in the case of anthracite, 1.4 g per cubic centimeter to 1 It ranges from 1.8 grams per cubic centimeter, or 3.8 grams per cubic centimeter to 4.1 grams per cubic centimeter for garnets. The multi-layer filtration method in which a plurality of types of filter media are mixed and used is a method in which particles having different sizes are laminated in order from the bottom as a layer to be filtered by utilizing such a difference in specific gravity. In the multi-layer filtration method, it is common to mix particles having a large specific gravity and a small size and particles having a small specific gravity and a large size to form a multilayer structure. The multi-layer filtration method is preferable because it has advantages such as high filtration efficiency per unit volume and low head loss as compared with using a single type of filter medium. As the granular filter medium, for example, garnet having a particle size of 0.3 mm, sand having a particle size of 0.6 mm, and anthracite having a particle size of 1.0 mm are mixed at a ratio of 2: 1: 1. Although it is used, it is desirable to adjust the mixing ratio and particle size according to the particle characteristics of the turbid material. The filling amount of the filter medium 2a is preferably determined in consideration of filtration performance, durability, head loss, and the like. By increasing the filter medium 2a, the removal performance and the amount of turbidity retained can be increased, the interval until cleaning can be extended and the frequency of cleaning can be reduced, but the head loss increases and the flow rate decreases. Problems may occur.

In the present embodiment, the filter medium 2a is composed of three layers using activated carbon as the upper layer, manganese sand as the middle layer, and gravel as the lower layer. In the filtration unit 2 of the present embodiment, the above-mentioned filtration action works mainly on the upper layer and the middle layer. On the other hand, in the gravel layer having a relatively large particle size in the lowermost layer, manganese sand and activated carbon are added to the lower strainer 2e so as to improve the flow of water to the lower strainer 2e and prevent the filter medium 2a from flowing out from the lower strainer 2e. It also acts as a cover to prevent it from reaching. Further, in the case of the backwash treatment described later, rectification is performed in the lowermost layer in order to facilitate the backwashing water ejected from the lower strainer 2e to flow to the middle layer and the upper layer.

Further, it is preferable that the withstand voltage of the filtration unit 2 containing the filter medium 2a has a capacity equal to or higher than the maximum output head of the electric pump 4 to be used. As the material of the filtration unit 2, a metal, a resin, a resin reinforced with glass fiber, or the like is suitable. The filtration unit 2 is required to have sufficient water resistance and weather resistance because it may be installed and used outdoors where a well is provided as well as in contact with water. Water resistance and weather resistance can be ensured by the material, wall thickness, or composite material such as coating. It is preferable that the size of the filtration unit 2 can secure a volume of about 1.5 to 3 times the total amount of the filter medium 2a to be put inside in consideration of the space developed by the filter medium 2a during backwashing. The shape of the filtering unit 2 is preferably a cylindrical shape, a spherical shape, an ellipsoidal spherical shape, or the like having high durability against pressure, but if the container can be strengthened by a wall thickness or the like to ensure durability, a rectangular parallelepiped or a cube or the like can be obtained. Containers can also be used.

(Piping configuration)
In the water treatment apparatus 1 of the present embodiment, in addition to the filtration treatment in which the raw water is filtered and taken out as purified water in the filtration unit 2, the particulate matter (dirt, turbid components, metal aggregates) collected in the filtration unit 2 is collected. It has a function to perform a backwash treatment that discharges) to the outside of the system by backwashing. Next, the piping configuration in the water treatment apparatus 1 and the flow of water in the filtration treatment and the backwash treatment will be described.

FIG. 4 is a schematic view showing the flow of water during the filtration process of the water treatment device 1. As shown in FIG. 4, the raw water inflow pipe 10 is connected to the filtration unit 2 from the raw water inlet 11 on the water source side via the chemical supply unit 3 during the filtration process. The purified water discharge pipe 20 is connected from the filtration unit 2 to the water purification outlet 21 of the water treatment device 1 during the filtration process.

On the other hand, FIG. 5 is a schematic view showing the flow of water during the backwash treatment. As shown in FIG. 5, during the backwashing process, the flow of water in the filtration unit 2 is reversed. Therefore, during the backwashing process, the water treatment device 1 sends water from the purified water discharge pipe 20 side to the filtration unit 2 and discharges water from the raw water inflow pipe 10 side in the filtration unit 2.

The water treatment device 1 according to the present embodiment can perform filtration treatment and backwash treatment by using one water source (electric pump 4) as one. Therefore, in order to allow the raw water to flow from the purified water discharge pipe 20 side in the filtration unit 2 during the backwash treatment, a backwash water pipe 80 that connects the raw water inflow pipe 10 and the purified water discharge pipe 20 is provided.

Here, in the raw water inflow pipe 10, a branch portion 13 between the chemical supply unit 3 and the filtration unit 2 is provided between the chemical supply unit 3 and the backwash drain pipe 40 for discharging the backwash drain that flows out from the filtration unit 2 during the backwash treatment. It is provided as a first branch. Further, a branch portion 12 of the backwash water pipe 80 with the raw water inflow pipe 10 is provided as a second branch portion, and a branch portion 22 of the backwash water pipe 80 and the purified water discharge pipe 20 is provided as a third branch portion. There is.

That is, the water treatment device 1 has a backwash drain pipe 40 branched downward from the branch portion 13 as the first branch portion and a backwash water pipe 80 branched at the branch portion 12 as the second branch portion.

In such a piping configuration, water will flow as follows during the filtration process (see Fig. 4). That is, the water (raw water) flows in the order of the raw water inlet 11, (raw water inflow pipe 10), the branch portion 12, the chemical supply portion 3, and the branch portion 13, and flows into the filtration unit 2. Then, the water (purified water) that has exited the filtration unit 2 flows in the order of (purified water discharge pipe 20), the branch portion 22, and the water purification outlet 21, and finally flows into the water purification tank.

A check valve 62 (see FIG. 2) is provided in the path of the purified water discharge pipe 20. The purified water taken out from the purified water outlet 21 is often connected to a water purification tank provided at a high place by piping. The check valve 62 stops the backflow of purified water from a water purification tank provided at a high place and prevents the backflow of water into the filtration unit 2.

On the other hand, during the backwash treatment, water will flow as follows (see Fig. 5). That is, the water flows in the order of the raw water inlet 11, (raw water inflow pipe 10), branch portion 12, (backwash water pipe 80), branch portion 22, (purified water discharge pipe 20), and flows into the filtration unit 2. The water that has exited the filtration section 2 flows in the order of (raw water inflow pipe 10), branch section 13, (backwash drain pipe 40), and backwash drain port 41, and is discharged to the outside of the system.

The water treatment device 1 is provided with an on-off valve for switching the communication direction between the branch portion 12, the branch portion 13, and the branch portion 22 so that the water flows in the filtration treatment and the backwash treatment. .. The on-off valve used in this embodiment uses the same type of manual valve, and when it is opened, the longitudinal direction of the handle is parallel to the pipe, and when it is closed, the longitudinal direction of the handle is orthogonal to the pipe. To. In the following, the direction of the handle shall mean the longitudinal direction of the handle.

The water treatment device 1 of the present embodiment realizes the above switching with four on-off valves (two-way valves). That is, the water treatment device 1 opens and closes the backwash water supply valve 81 provided in the backwash water pipe 80, the chemical supply valve 14, the purified water take-out valve 23, and the backwash valve 42 provided in the backwash drain pipe 40. Depending on the combination, the flow of water for filtration treatment and backwash treatment is switched.

Here, the chemical supply valve 14 is located between the branch portion 12 and the chemical supply portion 3 in the raw water inflow pipe 10, and the purified water take-out valve 23 is located between the branch portion 22 and the purified water outlet 21 in the purified water discharge pipe 20. It is provided in each.

During the filtration process, as shown in FIG. 4, the water treatment device 1 opens the chemical supply valve 14 and the purified water take-out valve 23, and closes the backwash water supply valve 81 and the backwash valve 42. That is, in the water treatment device 1, the raw water inlet 11 (water source) and the drug supply section 3 communicate with each other at the branch section 12 as the second branch section, and the drug supply section 3 communicates with the drug supply section 13 as the first branch section. Communicate with the filtration unit 2. Further, in the water treatment device 1, at the branch portion 22 as the third branch portion, the filtration unit 2 and the water purification outlet 21 (that is, the terminal side of the purified water discharge pipe 20) are communicated with each other.

On the other hand, during the backwash treatment, as shown in FIG. 5, the water treatment device 1 closes the chemical supply valve 14 and the purified water take-out valve 23, and opens the backwash water supply valve 81 and the backwash valve 42. That is, in the water treatment device 1, the raw water inlet 11 (water source) and the backwash water pipe 80 communicate with each other at the branch portion 12 as the second branch portion, and the filtration unit 2 at the branch portion 13 as the first branch portion. (The connection side of the filtration unit 2 with the raw water inflow pipe 10) and the backwash drain pipe 40 (backwash drain port 41) are communicated with each other. Further, in the water treatment device 1, at the branch portion 22 as the third branch portion, the backwash water pipe 80 and the filtration unit 2 (the connection side of the filtration unit 2 with the purified water discharge pipe 20) are communicated with each other.

That is, the water treatment device 1 switches the communication direction of the branch portion 12 by the chemical supply valve 14 and the backwash water supply valve 81. Further, in the water treatment device 1, the water outlet is determined by the purified water take-out valve 23 and the backwash valve 42. As described above, the water treatment apparatus 1 according to the present embodiment uses a two-way valve and switches the piping route without using a three-way valve having a complicated structure. Therefore, the water treatment device 1 according to the present embodiment can suppress clogging of pipes and can reduce the cost of the device as compared with the case of using a three-way valve.

Further, in the present embodiment, the backwash water supply valve 81 and the backwash valve 42 are arranged so that the water supply direction is vertical, and the chemical supply valve 14 and the purified water take-out valve 23 are arranged so that the water supply direction is horizontal. With such an arrangement, the handles of the backwash water supply valve 81, the backwash valve 42, the chemical supply valve 14, and the purified water take-out valve 23 are all oriented in the horizontal direction during the filtration process. In addition, during the backwash treatment, the handles of the backwash water supply valve 81, the backwash valve 42, the chemical supply valve 14, and the purified water take-out valve 23 are all oriented in the vertical direction, which makes it look good and makes it easy for the user to understand the operating state. There is a merit.

Further, the water treatment device 1 requires a relatively large flow rate when performing the backwash treatment. That is, the water treatment device 1 has a smaller flow rate during the filtration process than the flow rate during the backwash process. Therefore, the water treatment device 1 is provided with a throttle portion 24 in a part of the pipe passing through during the filtration treatment so as to suppress the flow rate during the filtration treatment. Specifically, in the purified water discharge pipe 20, the throttle portion 24 is provided on the downstream side of the branch portion 22 (see FIG. 2). In the water treatment device 1, the flow rate at the time of filtration treatment is set to a desired design value by the combination of the throttle portion 24 and the electric pump 4.

On the other hand, since the piping during the backwash treatment does not have a portion having a reduced diameter such as the throttle portion 24, a larger flow rate than during the filtration treatment can be secured and the backwash treatment can be performed efficiently. That is, the minimum diameter portion of the pipe used only for backwashing, the backwashing water pipe 80, and the backwashing drain pipe 40 is larger than the opening of the drawing portion 24. That is, the minimum diameter portion of the purified water discharge pipe 20 is smaller than the diameter portion adopted by the backwash water pipe 80 or the backwash drain pipe 40, and the water purification discharge pipe 20 has a branch portion 22 as a third branch portion and a filtration portion 2. Is provided on the opposite side.

Note that the water treatment device 1 of the present embodiment can perform a "rinse treatment" for discharging foreign matter remaining in the pipe during the backwash treatment. This rinsing process will be described with reference to FIG.

FIG. 6 is a schematic view showing the flow of water during the rinsing treatment of the water treatment device 1. As shown in FIG. 6, the pipe for performing the rinsing treatment includes a branch portion 26, a rinsing drain pipe 27, and a rinsing drain valve 28 in the purified water discharge pipe 20. The branch portion 26 is provided between the branch portion 22 and the water purification outlet 21 in the water purification discharge pipe 20. Then, the branch portion 26 branches the rinse drain pipe 27 from the purified water discharge pipe 20. The rinse drain valve 28 opens and closes the rinse drain pipe 27, and when the rinse drain pipe 27 is opened, the water flowing through the purified water discharge pipe 20 flows to the rinse drain port 29. The rinse drain valve 28 is closed during the filtration treatment and the backwash treatment (see FIGS. 4 and 5).

At the time of rinsing, the water treatment device 1 opens the chemical supply valve 14, closes the purified water take-out valve 23, and closes the backwash water supply valve 81 and the backwash valve 42. Further, the water treatment device 1 opens the rinse drain valve 28. By such a valve operation, water flows as follows during the rinsing process. That is, the water flows in the order of the raw water inlet 11, (raw water inflow pipe 10), the branch portion 12, the chemical supply portion 3, and the branch portion 13, and flows into the filtration unit 2. The water that has exited the filtration section 2 flows in the order of (purified water discharge pipe 20), branch section 22, (squeezing section 24), branch section 26, and rinse drain port 29, and is discharged to the outside of the system. That is, the flow of water up to the branch portion 26 is the same as that during the filtration process.

Immediately after the backwashing process is completed, foreign matter washed out by the backwashing of the filtration unit 2 remains in the filtration unit 2 or in the piping of the water treatment device 1. Therefore, by the rinsing treatment, water is allowed to flow up to the branch portion 26 in the same manner as in the filtration treatment, so that the foreign matter remaining in the filtration portion 2 or the piping of the water treatment device 1 is discharged to the outside of the system, and then It is possible to prevent foreign substances from being mixed into the purified water when the filtration treatment is performed.

Further, the water treatment device 1 of the present embodiment is provided with a direct drainage pipe 70 that bypasses the throttle portion 24 which is the minimum diameter portion of the purified water discharge pipe 20, and a direct drainage valve 71 that opens and closes the direct drainage pipe 70. .. Since the throttle portion 24 is a portion in which the pipe diameter is reduced, foreign matter is easily clogged. Therefore, it is preferable to directly open the drain valve 71 and bypass the narrowing portion 24, which is the minimum diameter portion, for the water during the rinsing treatment for discharging the foreign matter.

Also, depending on the degree of contamination of the raw water, it may be better to drain the water as it is without passing through the filtration unit 2. In such a case, the drain valve 71 may be opened directly. For example, when well water is used as raw water, the degree of contamination of the accumulated well water is large immediately after the water treatment device 1 is installed, and if the well water is filtered (passed through the filtration unit 2) as it is, the desired purification performance cannot be obtained and foreign substances are removed. The contained water will flow out from the water purification outlet 21. Therefore, it is advisable to drain the initial raw water immediately after installation without filtering. That is, by opening the backwash water supply valve 81 and the rinse drain valve 28 and closing the chemical supply valve 14 and the purified water take-out valve 23, the raw water taken into the system does not pass through the filtration unit 2 and the chemical supply unit 3. It can be drained directly. Also in this case, the direct drain valve 71 may be opened.

Further, by opening the backwash water supply valve 81 and the purified water take-out valve 23 and closing the chemical supply valve 14 and the rinse drain valve 28, the raw water taken into the system does not pass through the filtration unit 2 and the chemical supply unit 3. It can also be taken out directly.

(Filtration, backwashing action)
The filtration treatment and the backwash treatment in the water treatment apparatus 1 of the present embodiment, which are performed by the above configuration, will be described with reference to FIGS. 3 to 5.

During the filtration process, the water treatment device 1 opens the chemical supply valve 14 and the purified water take-out valve 23, and closes the backwash water supply valve 81 and the backwash valve 42, as shown in FIG. Then, when the electric pump 4 is operated, the raw water sent in the raw water inflow pipe 10 is added with a chemical in the chemical supply unit 3 and flows into the filtration unit 2. Then, as shown in FIG. 3, the raw water flowing into the filtration unit 2 passes through the upper strainer 2f and then from the upper side to the lower side of the filter medium 2a, and at this time, the turbid component is filtered by the filter medium 2a. Will be removed. Finally, after flowing into the lower strainer 2e, it passes through the inside of the outlet pipe 2d, exits the filtration unit 2, and purified water is obtained from the purified water discharge pipe 20.

Inside the filtration unit 2, the suspended substance is first captured by the activated carbon layer in the upper layer, and the aggregation of metal ions is promoted. In the middle manganese sand layer, aggregates of metal ions aggregated mainly in the upper layer are trapped.

On the other hand, during the backwash treatment, as shown in FIG. 5, the water treatment device 1 closes the chemical supply valve 14 and the purified water take-out valve 23, and opens the backwash water supply valve 81 and the backwash valve 42. Then, when the electric pump 4 is operated, the raw water flows back from the branch portion 12 through the backwash water pipe 80 to the purified water discharge pipe 20 and flows into the filtration portion 2. In the filtration unit 2, as shown in FIG. 3, the raw water flows downward in the outlet pipe 2d and infiltrates into the tank 2b from the lower strainer 2e. Raw water flows from bottom to top in tank 2b. At that time, by stirring and deploying the activated carbon in the upper layer, the water treatment device 1 separates the suspended substances and aggregates collected by the filter medium 2a from the filter medium 2a, and the filter unit is separated from the connection port of the raw water inflow pipe 10. 2 It is discharged to the outside.

(Drug supply department)
Next, the drug supply unit 3 will be described with reference to FIGS. 2 and 7 to 9B. FIG. 7 is a perspective view of the drug supply unit 3 of the water treatment device 1, and FIG. 8 is a cross-sectional view of the drug supply unit 3. 9A is a cross-sectional view of a main part of the drug supply unit 3, and FIG. 9B is an enlarged cross-sectional view of a portion shown by a dotted line in FIG. 9A.

As shown in FIG. 2, the drug supply unit 3 is arranged at the uppermost part of the water treatment device 1. That is, the chemical supply unit 3 is provided in the raw water inflow pipe 10 at the upper part of the pipe that rises upward from the raw water inlet 11. That is, the drug loading location (drug loading section 53) in the drug supply section 3 is arranged at a position higher in the vertical direction than the filtration section 2, the raw water inflow pipe 10, and the purified water discharge pipe 20 in the installed state. ..

Further, as shown in FIG. 2, the pipe from the outlet (outflow path 34, see FIG. 8) of the drug supply unit 3 extends downward and is connected to the filtration unit 2 via the branch portion 13.

As shown in FIG. 8, the drug supply unit 3 has an inflow path 31, a drug path 32, a bypass path 33, and an outflow path 34. The inflow path 31 is connected to the raw water inflow pipe 10 and allows the raw water to flow into the chemical supply unit 3. The drug passage 32 branches from the inflow path 31 and dissolves the drug. The bypass path 33 is also branched from the inflow path 31 and is provided to adjust the chemical solution to a required concentration. The outflow passage 34 merges with the chemical passage 32 and the bypass passage 33, is connected to the raw water inflow pipe 10 again, and sends out the raw water containing the chemical to the raw water inflow pipe 10. That is, the drug supply unit 3 has a bottomed tubular housing 51, and has an inflow path 31, an outflow path 34, a drug path 32, and a branch portion 35 of the bypass path 33 inside the housing 51. ..

Hereinafter, each configuration of the drug supply unit 3 will be described in more detail.

As shown in FIG. 8, the drug passage 32 is formed inside the tubular housing 51. The housing 51 has a bowl-shaped lower base 51a provided at the lower part and an upper cover 51b that covers the lower base 51a.

More specifically, the housing 51 has a truncated cone shape with a smaller diameter toward the top. An inflow path 31, a bypass path 33, and an outflow path 34 are connected to the lower base 51a, and a branch (branch portion 35) is formed inside the lower base 51a. The raw water flowing in from the inflow passage 31 is branched into the chemical passage 32, the outflow passage 34 and the bypass passage 33 at the branch portion 35. That is, the lower base 51a is bowl-shaped and has an inflow passage 31, an outflow passage 34, and a branch portion 35 of the medicine passage 32 inside.

The drug passage 32 is a housing, which is an ejection pipe 52 that rises in the vertical direction after branching, a drug placing portion 53 that comes into contact with the drug at the upper part of the ejection tube 52 and elutes the drug, and an outer circumference of the ejection pipe 52. It is composed of a collection unit 54 that is inside the 51. That is, the drug passage 32 is erected upward from the branch portion 35, and the drug placement section 53 is provided above the drug path 32. The chemical solution (raw water containing the drug) produced in the drug passage 32 is sent to the outflow channel 34 from the recovery opening 55 that communicates between the recovery unit 54 and the outflow channel 34. That is, in the housing 51, the outflow passage 34 is provided with an opening (recovery opening 55) for collecting the fluid that has passed through the drug passage 32.

The upper part of the ejection pipe 52, that is, the outer diameter of the ejection pipe 52 in the drug placing portion 53 has a larger diameter than the lower part of the ejection pipe 52, so that a desired amount of drug can be held. That is, the outer diameter of the lower part of the ejection pipe 52 is smaller than the outer diameter of the drug placing portion 53. Further, the water treatment device 1 secures the horizontal cross-sectional area of the recovery unit 54 by reducing the outer diameter of the lower portion of the ejection pipe 52.

After branching at the branching portion 35, the bypass road 33 merges at the outlet side (merging portion 36) of the outflow passage 34 in the state of raw water (see FIG. 7).

After branching at the branching portion 35, the raw water flowing through the outflow passage 34 merges with the chemical solution made in the chemical passage 32 at the recovery opening 55, and further downstream of the outflow passage 34, merges with the bypass passage 33 at the merging portion 36. As a result, the drug solution having a desired concentration is delivered from the drug supply unit 3.

That is, the raw water that has flowed into the drug supply section 3 is branched into the drug path 32, the bypass path 33, and the outflow path 34 at the branch section 35. By this branching, the water treatment device 1 adjusts the flow rate of the raw water flowing through the chemical passage 32, and adjusts the contact amount between the chemical and the raw water, which will be described later. Therefore, the raw water that comes into contact with the drug in the drug path 32 becomes a drug solution having a desired concentration. Next, the raw water that has passed through the drug passage 32 merges with the raw water that flows through the outflow passage 34 at the recovery opening 55. The raw water of the outflow channel 34 branched at the branch portion 35 at a desired ratio merges with the drug solution of the drug path 32 adjusted to a desired concentration and flow rate at the recovery opening 55 to obtain a drug solution having a desired concentration. The chemical solution in the drug passage 32 and the raw water in the outflow channel 34 merged at the recovery opening 55 are supposed to further merge with the raw water flowing in the bypass path 33 at the confluence 36, but the concentration of the drug after the confluence 36 It is advisable to adjust the flow rate of the bypass path 33 after confirming.

The ejection pipe 52 is a small-diameter pipe line and is erected with a drug placing portion 53 at the top. The ejection pipe 52 supports the drug placing portion 53 inside the housing 51. As a result, the drug placing portion 53 is fixed at a position higher than the center of the housing 51.

As shown in FIG. 9A, the drug placing portion 53 has a dish shape or a box shape with an open upper part. The bottom of the drug loading portion 53 is provided with an opening, is connected to the ejection pipe 52, and communicates the ejection pipe 52 with the inside of the drug loading portion 53. The horizontal diameter of the ejection pipe 52 at the height of the drug placing portion 53 is larger than the diameter of the lower portion of the ejection pipe 52. The water treatment device 1 first realizes that the raw water is brought into contact with the chemical at a desired flow rate by reducing the diameter of the lower portion of the ejection pipe 52 and providing the chemical loading portion 53 on the upper portion of the ejection pipe 52. There is. The drug placing portion 53 has a size for securing the amount (number) of the drugs to be placed so that a drug solution having a desired concentration can be obtained with respect to the flow rate of the raw water.

The drug solution in which the drug is dissolved flows out from the loading section outlet 58 (see FIG. 9B) provided on the side surface of the drug loading section 53 to the inside of the housing 51, that is, to the collecting section 54. As shown in FIG. 8, in the recovery unit 54, the chemical solution in which the drug is dissolved is stored in the lower part of the housing 51 (lower base 51a), and then flows out from the recovery opening 55 to the outflow path 34. Since the diameter of the ejection pipe 52 is reduced and the distance from the inner wall surface of the housing 51 is secured, the raw water in which the chemicals that have flowed down into the housing 51 has the liquid level relative to the height of the housing 51. , 1/2 or less. By accumulating the chemical solution in the housing 51 at a desired depth, the ratio of mixing with the raw water in the outflow passage 34 is adjusted.

Further, when the housing 51 is filled with the chemical solution in the operating state of the water treatment device 1, the elution amount of the chemical solution placed in the chemical loading portion 53 becomes large, and the chemical solution having a desired concentration cannot be obtained, or the chemical solution is not obtained. May melt and disappear. Therefore, it is necessary to keep the liquid level in the housing 51 low.

As shown in FIGS. 9A and 9B, the water treatment device 1 includes a solid drug, that is, a water-soluble solid drug 60 in the drug placing portion 53. That is, the drug passage 32 has an ejection pipe 52 erected upward in the housing 51, and has a drug placing portion 53 on which a solid drug is placed above the ejection pipe 52. As the water-soluble solid drug 60, tablets or granules may be used. This is because the surface area of the water-soluble solid drug 60 can be increased and a stable solvent concentration can be maintained. The size of the water-soluble solid drug 60 may be 30 mm in diameter and 10 mm to 20 mm in height for tablets, and 5 to 15 mm in diameter for granules. When the size of the water-soluble solid drug 60 is small, the adjacent drugs come into contact with water at the same time and the drugs stick to each other. If stuck, only the lower part of the drug may come into contact with water and the desired concentration of the drug solution may not be obtained. Alternatively, when the size of the water-soluble solid drug 60 is small, the contact area with water supplied from the ejection pipe 52 becomes large, and a drug solution having a desired concentration cannot be obtained. Therefore, the water treatment device 1 uses the water-soluble solid drug 60 having the above-mentioned size in order to supply the drug solution having a desired concentration.

In the present embodiment, the drug placing portion 53 is provided with a guide (not shown) so that the water-soluble solid drug 60 of the tablet can be held in the vertical direction. That is, the guide has a long rail shape in the vertical direction, and by inserting the water-soluble solid drug 60 between the two rails, the water-soluble solid drug 60 is held as if it were stacked in the vertical direction. Therefore, the water-soluble solid drug 60 dissolves in the raw water from below, and a drug solution having a desired concentration can be obtained.

Further, as described above, the water-soluble solid drug 60 has a function of oxidizing metal ions contained in raw water to form agglomerates that are poorly soluble in water. Various oxidizing agents can be used as the water-soluble solid drug 60, but the water-soluble solid drug 60 is soluble in water during the operation of the water treatment device 1, that is, when the drug is added to the raw water. Easy ones are good. Further, when the water treatment device 1 is stopped or backwashed, that is, when the addition of the drug is interrupted, it is preferable that the water treatment device 1 retains its solid shape and does not flow out from the drug placing portion 53. The water treatment apparatus 1 according to the present embodiment uses trichloroisocyanuric acid.

Since each member of the drug supply unit 3 may be in contact with the drug for a long time, it is preferable to select a material having low reactivity to the drug such as PVC (polyvinyl chloride), PMMA (polymethyl methacrylate), PP (polypropylene). .. On the other hand, since the ejection pipe 52 needs to have strength to support the drug placing portion 53, the material of the ejection tube 52 is vinyl chloride or ABS (acrylonitrile, butadiene, styrene), which is stronger than PP, considering compatibility with the drug. It is preferable to select such as. It is better to suppress the outer diameter of the ejection pipe 52 to 1/4 or less of the inner diameter of the lower base 51a. As described above, a space (recovery unit 54) for temporarily storing the solution after the drug is supplied discharged from the mounting unit outlet 58 can be provided on the outside of the ejection pipe 52, and the water level in the housing 51 suddenly rises. This is because it can be prevented from rising and reaching the drug placing portion 53. For example, when the inner diameter of the lower base 51a is 130 mm, a vinyl chloride pipe having an outer diameter of about 25 mm to 40 mm may be used. That is, the outer diameter of the ejection pipe 52 may be 1/3 or less of the inner diameter of the housing 51 (lower base 51a). In this way, by reducing the outer diameter of the ejection pipe 52, it is possible to secure a large horizontal cross-sectional area in the recovery section 54, that is, a large area of the chemical solution water surface stored in the recovery section 54. Therefore, the height of the chemical solution stored in the recovery unit 54 can be kept low, and as a result, the elution amount of the chemical solution can be appropriately set, and the chemical solution having a desired concentration can be obtained. In the present embodiment, the upper cover 51b has a truncated cone shape, the lower base 51a has a substantially cylindrical bottom, and the inner diameter of the lower base 51a is the maximum inner diameter of the housing 51.

Further, as shown in FIGS. 9A and 9B, the ejection pipe 52 has a partition plate 56 that vertically partitions the inside of the ejection pipe 52. The drug placing portion 53 is provided on the partition plate 56, and the water-soluble solid drug 60 is placed on the drug placing portion 53. The partition plate 56 is provided with a mounting portion inlet 57 into which raw water sent from the ejection pipe 52 flows. The mounting portion entrance 57 is provided near the central portion of the partition plate 56, but does not have to be the center. Further, the partition plate 56 has a mortar-shaped outer peripheral portion raised and the vicinity of the mounting portion entrance 57 lowered. That is, the partition plate 56 is provided with an inclination that descends from the outer edge side to the mounting portion entrance 57 side. The mounting portion entrance 57 may be formed by forming a net-like central portion of the partition plate 56. Alternatively, the mounting portion entrance 57 may be at least one donut-shaped slit formed so as to surround the central portion of the partition plate 56, or a plurality of small hole groups. Further, on the side surface of the ejection pipe 52, there is a mounting portion outlet 58 from which raw water containing a dissolved drug flows out. The mounting portion outlet 58 is provided at a position higher than the top of the outer peripheral portion of the partition plate 56. The water-soluble solid drug 60 is arranged on the partition plate 56 in the radial direction between the mounting portion inlet 57 and the mounting portion outlet 58.

That is, the ejection pipe 52 has a partition plate 56 that partitions the inside vertically, and a mounting portion inlet 57 opened in the partition plate 56. Further, the mounting portion inlet 57 is provided closer to the central axis of the ejection pipe 52 than the mounting portion outlet 58, and the mounting portion outlet 58 is above the partition plate 56 and is on the side wall side of the ejection pipe 52. It is provided in. Further, the drug loading section 53 is for loading the drug on the partition plate 56, and a part of the drug loading section 53 is arranged between the loading section inlet 57 and the loading section outlet 58. ing. That is, the loading portion outlet 58 is provided above the lowest point of the drug loading portion 53.

According to such a configuration, the water-soluble solid drug 60 is arranged closer to the center on the mortar-shaped partition plate 56. Then, the raw water sent from the ejection pipe 52 infiltrates from the loading portion inlet 57, comes into contact with the water-soluble solid drug 60 placed near the center, and dissolves the water-soluble solid drug 60 to become a chemical solution. The raw water in which the drug is dissolved rises upward and flows out from the outlet 58 of the mounting section into the housing 51 of the drug supply section 3. At this time, since the water-soluble solid drug 60 is arranged between the mounting portion inlet 57 and the mounting portion outlet 58 in both the radial direction and the vertical direction, it always comes into contact with the raw water and is placed as a chemical solution. It flows out from the part outlet 58. In addition, the degree of contact of the water-soluble solid drug 60 can be ensured with respect to a predetermined flow rate, and the drug solution can be obtained in a desired concentration range.

Further, according to the above configuration, it is possible to prevent the water-soluble solid chemicals 60 above the loading portion outlet 58 from containing water, so that the water-soluble solid chemicals 60 can be prevented from sticking to each other and sticking to the wall surface. It is possible. Since it is possible to prevent the water-soluble solid agents 60 from sticking to each other, when the water-soluble solid agents 60 in the lower layer are eluted and disappear, the upper solid agents are lowered by gravity, and the water-soluble solid agents 60 are placed in the lower part. Can be supplied. That is, the water-soluble solid drug 60 and raw water can be continuously brought into contact with each other. Then, the drug concentration can be stabilized even when the drug supply device is used for a long period of time.

Further, the outer wall surface of the ejection pipe 52 and the drug placing portion 53 is an angle formed by a straight line lowered vertically downward from an arbitrary position on the outer wall surface and the outer wall surface below the loading portion outlet 58 (in FIG. 9A). The angle α) is preferably 0 to 45 degrees. By not squeezing the outer wall surface at a steep angle, the raw water flowing out from the loading portion outlet 58 flows down along the outer wall surface of the ejection pipe 52 and the drug loading portion 53, and the raw water (chemical solution) stored in the housing 51. ) And gently mix. Therefore, it becomes difficult for blisters to form on the liquid surface.

On the other hand, when the raw water containing the drug flows out into the air away from the outer wall surface of the ejection pipe 52 and the drug placing portion 53, blisters are formed when the raw water (chemical solution) stored in the housing 51 is mixed. It will be. The blisters fill the inside of the housing 51 and raise the apparent water level. Alternatively, since the formed blisters are discharged from the outflow passage 34 together with the chemical solution, the air in the housing 51 is reduced, and as a result, the water level in the recovery unit 54 rises. That is, the increased water level causes water to be immersed in the water-soluble solid drug 60, and as a result, the drug is excessively dissolved, and a drug solution having a desired concentration cannot be obtained. On the other hand, in the present embodiment, the raw water flowing out from the loading portion outlet 58 is allowed to flow down along the outer wall surface of the ejection pipe 52 and the drug loading portion 53 so as not to form blisters in the housing 51. By doing so, it is possible to prevent the drug solution having a desired concentration from being obtained.

Further, in the drug passage 32 (spout pipe 52), the bypass passage 33, and the outflow passage 34, a throttle portion is provided immediately after (downstream side) the branch portion 35. This throttle portion is provided in order to adjust the distribution of the raw water flowing through the drug passage 32, the bypass path 33, and the outflow path 34, and to make the concentration of the drug in the raw water flowing out from the drug supply section 3 a desired concentration. The bypass path 33 is provided with an on-off valve 33a (see FIG. 7), and the bypass path 33 can be closed. The opening area of the throttle portion provided in the outflow passage 34 is larger than the opening area of the other throttle portions provided in the drug passage 32 (spout pipe 52) and the bypass passage 33. Thereby, the concentration of the drug solution flowing out from the drug supply unit 3 can be adjusted to a desired range.

Further, the housing 51 of the drug supply unit 3 is designed so that the upper cover 51b can be removed from the lower base 51a. That is, the housing 51 has a tubular shape that can be vertically divided into an upper cover 51b and a lower base 51a. Since dirty raw water flows into the drug supply unit 3, regular maintenance is required. Therefore, the upper cover 51b is removed so that the inside can be cleaned. Further, the ejection pipe 52 can be removed at the branch portion 35. As described above, the drug passage 32 (spout pipe 52), the bypass passage 33, and the outflow passage 34 are each provided with a throttle on the downstream side of the branch portion 35, and foreign matter may be present in the throttle portion depending on long-term use. It is possible that it will adhere. Therefore, in the water treatment device 1, the ejection pipe 52 is removed at the branch portion 35 portion, and the inside of the pipe can be cleaned.

Part or all of the upper cover 51b should be transparent. By making the upper cover 51b transparent, the presence of the water-soluble solid drug 60 can be confirmed inside, and it can be replenished if necessary. In particular, it is preferable that the upper portion of the upper cover 51b, which is above the liquid level of the chemical solution in the housing 51, is transparent. Further, the top surface of the upper cover 51b may be a supply port for the water-soluble solid drug 60, and this supply port may be transparent. Further, as described above, since the water-soluble solid drug 60 is supported by the guide and arranged side by side, it is easy to confirm the input amount from the outside.

Since raw water containing dirt flows into the housing 51 of the drug supply unit 3, the inside becomes dirty. However, as described above, the water surface inside the housing 51 is designed to be at least half the height of the housing 51 during operation. Further, the loading portion outlet 58 is provided on the side surface of the drug loading portion 53. That is, the water treatment device 1 has a loading section outlet 58 on the side surface of the drug loading section 53 for discharging the drug solution in which the drug has been dissolved. Therefore, since the raw water does not reach the vicinity of the top surface of the housing 51, the vicinity of the supply port of the water-soluble solid chemical 60 is hard to get dirty. That is, the water treatment device 1 makes the supply port transparent so that the water-soluble solid drug 60 of the drug placing portion 53 can be easily visually recognized.

(Air supply valve)
Here, the special configuration and the action during the backwashing treatment will be described with reference to FIGS. 2, 4, 5, and 10. FIG. 10 is a cross-sectional view of the air supply valve 43 used in the water treatment device 1.

As described above, the backwash drain pipe 40 is formed by piping the backwash drain port 41 from the branch portion 13 (see FIG. 5). That is, the backwash drain pipe 40 extends downward from the branch portion 13 as the first branch portion. An air supply valve 43 is provided on the downstream side of the backwash valve 42 in the middle of the path of the backwash drain pipe 40 (see FIG. 2). One of the air supply valves 43 is connected to the backwash drain pipe 40, and the other is open to the atmosphere side (see FIG. 10). The air supply valve 43 has a check valve structure, which enables inflow from the atmosphere side and prevents outflow from the backwash drain pipe 40 side. That is, the water treatment device 1 is provided with an air supply valve 43 in the path of the backwash drain pipe 40, which opens one end to the atmosphere and allows the water to flow into the pipe from the atmosphere side. Further, the air supply valve 43 is a check valve that can only flow in from the atmosphere side.

Further, as shown in FIGS. 2 and 10, the air supply valve 43 is provided with a valve structure portion at a position where it rises upward from the backwash drain pipe 40. That is, the air supply valve 43 is provided at a position higher than the branch point 44 to the air supply valve 43 in the backwash drain pipe 40.

The operation of the air supply valve 43 in such a structure will be described.

As shown in FIG. 4, during the filtration process, the backwash valve 42 is closed, and the backwash drain pipe 40 on the downstream side of the backwash valve 42 is filled with air. Then, when the backwash treatment is switched, as shown in FIG. 5, the backwash valve 42 is opened, so that the air in the backwash drain pipe 40 moves upward and enters the drug supply unit 3. Will supply air to. When the drug supply unit 3 is filled with air, the water-soluble solid drug 60 is exposed to air instead of being immersed in raw water. Therefore, it is possible to prevent the water-soluble solid drug 60 from being unnecessarily dissolved and to be prevented from being dissolved and fixed.

On the other hand, since the backwashing drain pipe 40 is backwashed, drain water flows and is filled with the drain water. When the backwash treatment is completed, the backwash valve 42 is closed again, and air is sent from the air supply valve 43 into the backwash drain pipe 40. Therefore, at times other than the backwash treatment, the backwash drain pipe 40 is filled with air, and air can be sent to the chemical supply unit 3 at the time of the next backwash treatment.

The water treatment device 1 fills the inside of the air supply valve 43 with air by providing the air supply valve 43 upward from the branch point 44 of the backwash drain pipe 40 with respect to the backwash drain pipe 40. It has a structure that suppresses the ingress of water. That is, the structure of the water treatment device 1 protects the air replenishment valve 43 from dirty water so that air replenishment can be reliably performed.

As shown in FIG. 2, the horizontal height of the backwash drain pipe 40 in the piping path from the branch point 44 to the air supply valve 43 to the drug supply section 3 is the lowest at the branch point 44, and the drug supply section 3 It rises toward the outlet of the inflow path 31 of.

Further, in the water treatment device 1 according to the present embodiment, the air supply valve 43 is used as a check valve, but other types of valves may be used as long as air can be sent into the backwash drain pipe 40. For other types of valves, for example, a manual valve may be used. The method of sending air into the backwash drain pipe 40 is a method of sending air into the backwash drain pipe 40 when the backwash treatment is completed, or a drain hole and a stopper are provided in the path of the backwash drain pipe 40. When the backwash treatment is completed, the stopper may be removed, the water in the backwash drain pipe 40 may be drained, and air may be filled.

(Arrangement of filtration part)
The arrangement of the filtration unit 2 will be described with reference to FIGS. 11 and 12. FIG. 11 is a side view showing the peripheral structure of the filtration unit 2 of the water treatment device 1, and FIG. 12 is an exterior perspective view of the water treatment device 1.

The performance of the filter medium 2a filled in the filter unit 2 deteriorates due to long-term use even if it is backwashed. Therefore, the filtration unit 2 requires regular maintenance. In order to maintain the filtration unit 2, the water treatment device 1 of the present embodiment can remove the filtration unit 2.

As shown in FIG. 11, when the filtration unit 2 is viewed from a predetermined direction, pipes (raw water inflow pipe 10, purified water discharge pipe 20, backwash water pipe 80, backwash drain pipe 40, etc.), chemical supply part 3 Is arranged separately from the filtration unit 2. That is, when the connection joint 15 provided at the connection portion between the filtration unit 2, the raw water inflow pipe 10 and the purified water discharge pipe 20 is opened, the filtration unit 2 can slide and move in one direction and the opposite direction. In FIG. 11, the filtration unit 2 can move in the direction perpendicular to the paper surface. Therefore, the connection surface on the other side of the connection joint 15 is provided parallel to the moving direction of the filtration unit 2. The connection joint 15 has an inflow side joint provided on the raw water inflow pipe 10 side and an outflow side joint provided on the purified water discharge pipe 20 side, and is filtered by the connection of the connection joint 15 having these two joints. The part 2 is connected to the piping in the main body.

Further, as shown in FIG. 12, in the water treatment device 1 of the present embodiment, in order to protect the pipes, the outer shell is covered with a panel to form a housing. As described above, since the filtration unit 2 can move in one direction and the opposite direction, the inspection panel 61 is a panel in one direction and the opposite surface to the filtration unit 2 among the outer panels. Maintenance of the filtration unit 2 can be performed by removing both or one of the inspection panels 61.

In this way, the filtration unit 2 can be translated toward one inspection panel 61 or the inspection panels 61 provided at two locations facing each other, and maintenance of the filtration unit 2 can be performed with a small inspection space. It will be possible.

Although the water treatment device 1 according to the present embodiment allows the filtration unit 2 to move in one direction and the opposite direction, it may be in only one direction. In that case, the connection surface on the other side (opposite side of the filtration unit 2) of the connection joint 15 may be directed to one direction. That is, the connection surface on the piping side facing the connection joint 15 faces in one direction in which the filtration unit 2 moves, or the connection surface of the connection joint 15 is arranged parallel to the direction in which the filtration unit 2 moves. It suffices if it is done. According to such an arrangement, the filtration unit 2 can move in at least one direction.

The water treatment device according to the present disclosure is a water treatment device that can supply a sufficient amount of clean backwash water for backwashing and can be installed in a space-saving manner as compared with conventional products, and is therefore used for purifying well water and stored water. It is also useful as a small household water treatment device.

1 Water treatment device 2 Filter 2a Filter material 2b Tank 2c Distributor 2d Outlet pipe 2e Lower strainer 2f Upper strainer 3 Chemical supply unit 4 Electric pump 10 Raw water inflow pipe 11 Raw water inlet 12 Branch part 13 Branch part 14 Chemical supply valve 15 Connection 20 Purified water discharge pipe 21 Purified water outlet 22 Branch part 23 Purified water take-out valve 24 Squeezing part 26 Branch part 27 Rinse drain pipe 28 Rinse drain valve 29 Rinse drain port 31 Inflow path 32 Chemical path 33 Bypass path 33a Open / close valve 34 Outflow path 35 Branch 36 Confluence 40 Backwash drain pipe 41 Backwash drain port 42 Backwash valve 43 Air supply valve 44 Branch point 51 Housing 51a Lower base 51b Upper cover 52 Ejection pipe 53 Drug loading part 54 Recovery part 55 Recovery opening 56 Partition Plate 57 Mounting part inlet 58 Mounting part outlet 60 Water-soluble solid chemicals 61 Inspection panel 62 Check valve 70 Direct drain pipe 71 Direct drain valve 80 Backwash water supply pipe 81 Backwash water supply valve 101 Solid chemicals supply device 102 Water intake 103 Water-soluble solid drug 104 Drug contact phase α angle

Claims (17)

1. A filter unit containing a filter medium and
   A raw water inflow pipe for allowing raw water to flow into the filtration section,
   A drug supply unit that adds a drug in the path of the raw water inflow pipe,
   It has a purified water discharge pipe for taking out purified water after filtration from the filtration unit.
   A water treatment apparatus characterized in that the drug placement location in the drug supply section is arranged at a position higher in the vertical direction than the filtration section, the raw water inflow pipe, and the purified water discharge pipe in the installed state.
2. The water treatment device further includes a backwash drain pipe that is in the path of the raw water inflow pipe and that branches downward from the first branch portion between the chemical supply unit and the filtration unit in the installed state.
   It has a backwash water pipe that is in the path of the raw water inflow pipe and is branched at a second branch between the water source in which the raw water is stored and the chemical supply part.
   The backwash water pipe joins the purified water discharge pipe at a third branch in the path of the purified water discharge pipe.
   At the time of filtration processing
   The first branching portion communicates the drug supply portion with the filtration portion.
   The second branch portion communicates the water source with the drug supply portion.
   The third branch portion communicates the filtration portion with the terminal side of the purified water discharge pipe.
   During backwashing
   The first branch portion communicates the backwash drain pipe with the filtration portion.
   The second branch portion communicates the water source with the backwash water pipe.
   The water treatment apparatus according to claim 1, wherein the third branch portion communicates the backwash water pipe and the filtration portion.
3. The minimum diameter portion of the purified water discharge pipe is smaller than the minimum diameter portion of the backwash water pipe or the backwash drain pipe, and is provided on the opposite side of the third branch portion of the purified water discharge pipe from the filtration portion. The water treatment apparatus according to claim 2, wherein the water treatment apparatus has been obtained.
4. The water treatment device according to claim 3, further comprising a direct drainage pipe that bypasses the minimum diameter portion of the purified water discharge pipe.
5. The backwash drain pipe extends downward from the first branch portion in the installed state.
   The second aspect of the present invention is characterized in that the water treatment apparatus further includes an air supply valve in the path of the backwash drain pipe, which has one end open to the atmosphere and allows inflow from the atmosphere side into the pipe. The water treatment apparatus described.
6. The water treatment apparatus according to claim 5, wherein the air supply valve is a check valve capable of only flowing in from the atmosphere side.
7. The horizontal height of the backwash drain pipe in the installed state in the piping path from the branch point to the air supply valve to the drug supply section is the lowest at the branch point and toward the outlet of the drug supply section. The water treatment apparatus according to claim 5 or 6, characterized in that the height is increased.
8. The water treatment device according to claim 7, wherein the air supply valve is provided at a position higher than the branch point in the installed state.
9. The drug supply unit has a bottomed tubular housing, and has an inflow path, an outflow path, a drug path, and a branch portion of a bypass path inside the housing.
   The water treatment apparatus according to claim 1, wherein the outflow passage is provided with an opening for collecting a fluid that has passed through the chemical passage in the housing.
10. The housing has a tubular shape that can be vertically divided into an upper cover and a lower base in the installed state.
    The water treatment apparatus according to claim 9, wherein the lower base is bowl-shaped and has the inflow passage, the outflow passage, and the branch portion of the chemical passage inside.
11. The water treatment according to claim 10, wherein the drug passage is erected upward from the branch portion in an installed state, and a drug placement portion, which is a drug placement place, is provided at the upper portion. apparatus.
12. The drug passage has an ejection pipe erected upward in the installed state in the housing.
    The water treatment apparatus according to claim 11, wherein the ejection pipe is removable at the branch portion.
13. The drug passage has an ejection pipe erected upward in the housing in the installed state, and is a drug placing place, and a drug placing on which a solid drug is placed above the ejection tube. Has a part
    The drug loading section has a loading section outlet on the side surface for discharging the drug solution in which the drug has been dissolved.
    The water treatment apparatus according to claim 9, wherein the outer diameter of the lower part of the ejection pipe in the installed state is smaller than the outer diameter of the drug placing portion.
14. The ejection pipe
    In the installed state, the partition plate that divides the inside up and down,
    It has a mounting portion entrance opened in the partition plate, and has
    The above-mentioned place entrance is provided closer to the central axis of the ejection pipe than the above-mentioned place outlet.
    In the installed state, the above-mentioned place outlet is provided above the partition plate and on the side wall side of the ejection pipe.
    The drug placing portion is for placing the drug on the partition plate, and a part of the drug placing portion is arranged between the entrance of the previously described placing portion and the outlet of the previously described placing portion. 13. The water treatment apparatus according to claim 13.
15. The water treatment apparatus according to claim 14, wherein the outlet of the above-mentioned placing portion is provided above the lowest point of the medicine placing portion in the installed state.
16. The water treatment apparatus according to claim 15, wherein the partition plate is provided with an inclination that descends from the outer edge side to the entrance side of the previously described placing portion in the installed state.
17. The water treatment device according to any one of claims 13 to 16, wherein the drug is a tablet.

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