Water treatment device

Abstract

To supply raw water at a large flow rate to a downstream side water treatment device.SOLUTION: A water treatment device 1 includes a filter part 2, a first raw water inflow piping 7a, a second raw water inflow piping 7b, a medicine supply part 3, a pure water discharge piping 10 for taking out the filtered pure water from the filter part 2 or taking out the raw water from the first raw water inflow piping 7a, a drainage water drain piping 8 for taking out water used for washing the filter part 2, a distribution head connecting the medicine supply part 3 and the filter part 2, a first valve 11 opening / closing the first raw water inflow piping 7a, a second valve 12 opening / closing the second raw water inflow piping 7b, and a third valve 13 opening / closing the drainage water drain piping 8. A filter treatment mode, a reverse washing treatment mode and a bypass operation mode can be switched by opening / closing each of the valves to achieve an initial purpose.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to a water treatment device that purifies water by filtration and the addition of chemicals. [Background technology]

[0002] Water treatment devices using granular filter media are widely used in water purification plants, factories, and other facilities. These devices are primarily used to remove impurities, including turbidity components, from raw water. However, like conventional filters, they gradually become clogged as they capture impurities, leading to various problems, such as increased pressure loss and the formation of water channels that allow impurities to escape downstream. Common regeneration methods include backwashing, which passes raw water in the opposite direction to the filtration direction, discharging the trapped impurities, and rinsing, which can remove any foreign matter remaining in the filtration section or piping immediately after the backwashing process. Furthermore, when the raw water contains a high level of contaminants, such as turbidity components, water treatment devices may be connected together to improve purification performance.

[0003] 8, in the water treatment device 101, during filtration treatment, a first branch 111 between the chemical supply unit 103 and the filtration unit 102 connects the chemical supply unit 103 and the filtration unit 102, a second branch 112 between the water source and the chemical supply unit 103 connects the water source to the chemical supply unit 103, and a third branch 113 in the path of the purified water discharge piping 104 connects the filtration unit 102 and the distal end of the purified water discharge piping 104. Meanwhile, during backwash treatment, the first branch 111 connects the backwash drain piping 105 and the filtration unit 102, the second branch 112 connects the water source to the backwash water pipe 106, and the third branch 113 connects the backwash water pipe 106 to the filtration unit 102. This mechanism makes it possible to switch the operation mode by operating a valve, and to perform filtration, backwashing, and rinsing processes using a single water source (see, for example, Patent Document 1). [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Patent Publication No. 2021-23832 Summary of the Invention [Problem to be solved by the invention]

[0005] When such water treatment devices are connected in series to improve performance, the required flow rate cannot be obtained due to the complicated piping route and unnecessary resistance. The present invention aims to solve the above problems and provide a water treatment device that can ensure the required flow rate even when connected upstream of other water treatment devices. [Means for solving the problem]

[0006] To achieve this object, the water treatment device according to the present invention comprises: A water treatment device that filters raw water from a water source and extracts purified water, A first raw water inlet pipe and a second raw water inlet pipe that supply raw water from the water source; a chemical supply unit connected to the first raw water inlet pipe and supplying a chemical to water supplied from the first raw water inlet pipe; A filtration section containing a filter material; A purified water discharge pipe that takes out treated water filtered by the filtration unit; a drainage pipe for extracting backwash water used to clean the filtration unit from the chemical supply unit; a first communication passage that communicates the filtering unit with the drug supply unit; a second communication passage that communicates the filtration unit with the purified water discharge pipe and the filtration unit with the second raw water inlet pipe; a first valve provided in the first raw water inlet pipe for opening and closing a flow path; a second valve provided in the second raw water inlet pipe for opening and closing a flow path; a third valve provided in the wastewater drain pipe for opening and closing a flow path, During a filtration process for filtering raw water, the first valve is opened and the second valve and the third valve are closed. During a backwash process for cleaning the filtration unit, the second valve and the third valve are opened and the first valve is closed. the drug supply unit and the filtering unit are connected by a dispensing head; the dispensing head has the first communication passage and the second communication passage therein, When the second valve is opened and the first valve and the third valve are closed, raw water flows directly from the second raw water inlet pipe to the purified water outlet pipe. [Effects of the Invention]

[0007] According to the present invention, it is possible to provide a water treatment device that can ensure the original flow rate even when connected upstream of another water treatment device. [Brief explanation of the drawings]

[0008] [Figure 1] 1 is a schematic diagram of the overall configuration of a water treatment device according to a first embodiment of the present invention; [Figure 2] 1 is a perspective view of a chemical supply unit, a distribution head, a filtration unit, and first to third valves of the water treatment device; [Figure 3] Schematic diagram showing the flow path for bypass operation when the water treatment device is connected to another water treatment device [Figure 4] Schematic diagram showing the flow path during backwashing treatment of the water treatment device [Figure 5] Cross-sectional view of the filtration section of the water treatment device [Figure 6] A plan view of the water treatment device omitting the filtration unit 2. [Figure 7] A-A cross-sectional view of the first raw water inlet pipe, chemical supply section, and distribution head of the water treatment device [Figure 8] Schematic diagram showing the configuration of a conventional water treatment device DETAILED DESCRIPTION OF THE INVENTION

[0009] Hereinafter, an embodiment of the present invention will be described with reference to the drawings.

[0010] The water treatment device 1 of this embodiment uses well water or water stored in a water tank as raw water, and performs a filtration process to remove metal ions and turbid components contained in this raw water, and a backwash process to discharge metal ion aggregates and turbid components that have accumulated in the system due to the filtration process out of the system.

[0011] FIG. 1 is a schematic diagram showing the overall configuration of a water treatment device 1 according to this embodiment and the flow of water during filtration. FIG. 2 is a perspective view of the chemical supply unit, distribution head, filtration unit, first valve, second valve, and third valve of the water treatment device 1 according to this embodiment. FIG. 3 is a schematic diagram showing the water treatment device 1 connected in series with another water treatment device (downstream water treatment device 6) when the raw water contains a large amount of contaminants. The purpose of this connection is to improve the performance of removing contaminants when the raw water is highly contaminated.

[0012] 1, 2, and 3, water treatment device 1 has filtration unit 2, chemical supply unit 3, distribution head 5, first valve 11, second valve 12, and third valve 13. Pipes for sending raw water to water treatment device 1 are first raw water inlet pipe 7a and second raw water inlet pipe 7b, a pipe for extracting treated water filtered and purified by filtration unit 2 is purified water outlet pipe 10, and a pipe for extracting backwash water used to clean the filtration unit from the chemical supply unit during backwash operation is wastewater drain pipe 8. In bypass operation, purified water outlet pipe 10 of water treatment device 1 can directly flow raw water flowing in from second raw water inlet pipe 7b, and raw water can be supplied to another water treatment device downstream of water treatment device 1 (downstream water treatment device 6).

[0013] Specifically, the water treatment device 1 has a filtration unit 2 containing a filter medium and a chemical supply unit 3 that adds chemicals to raw water, and the filtration unit 2 and the chemical supply unit 3 are connected via a distribution head 5. The first raw water inlet pipe 7a is connected to the chemical supply unit 3. Water is supplied from the first raw water inlet pipe 7a to the chemical supply unit 3, and the chemical supply unit 3 supplies chemicals to the water supplied from the first raw water inlet pipe. The second raw water inlet pipe 7b is connected to the distribution head 5, and water is supplied to the distribution head 5 from the second raw water inlet pipe 7b. The purified water discharge pipe 10 is connected to the distribution head 5 and extracts treated water filtered by the filtration unit 2 from the distribution head 5. The wastewater drain pipe 8 is connected to the chemical supply unit 3 and extracts backwash water used to clean the filtration unit 2 from the chemical supply unit 3.

[0014] The first valve 11 is provided in the first raw water inlet pipe 7a and opens and closes the flow path of the first raw water inlet pipe 7a. The second valve 12 is provided in the second raw water inlet pipe 7b and opens and closes the flow path of the second raw water inlet pipe 7b. The third valve 13 is provided in the wastewater drain pipe 8 and opens and closes the flow path of the wastewater drain pipe 8. The flow paths of each component can be connected or cut off by opening and closing each valve.

[0015] The filtration unit 2 purifies the raw water by removing metal ions and turbidity components from the raw water. Dirt accumulated in the filtration unit 2 is discharged outside the device through a backwash process, keeping the filtration unit 2 clean and allowing it to be used repeatedly. Backwashing is a process in which raw water is forced to flow in the opposite direction within the filtration unit 2 to discharge the dirt. The chemical supply unit 3 adds chemicals to the raw water, coagulating metal ions contained in the raw water as substances that are difficult to dissolve in water, or coagulating turbidity components, making them easier to capture in the filtration unit 2.

[0016] Raw water is sent to the water treatment device 1 via a first raw water inlet pipe 7a and a second raw water inlet pipe 7b by an electric pump 4. Instead of using the electric pump 4, a water tank that stores raw water may be installed at an elevated location, and the raw water may be sent to the water treatment device 1 by utilizing the elevation difference between the water tank and the water treatment device 1. Alternatively, tap water jointly operated in a local area may be directly connected. In this embodiment, the water source includes wells, water tanks, waterworks, etc., as well as devices that send out raw water.

[0017] The electric pump 4 is a motor-driven pump that draws up and discharges water from a well or water stored in a water tank. Examples include centrifugal pumps such as centrifugal pumps and turbine pumps, as well as vortex pumps (cascade pumps), jet pumps, axial flow pumps, and mixed flow pumps. Furthermore, if the well water level is low, a submersible pump, such as a submersible pump, is recommended instead of a suction pump. For general household use, the well depth must be approximately 1 to 10 meters for shallow wells and 10 to 30 meters or more for deep wells. Considering the head loss of downstream piping and water treatment equipment, a pump with a head of 20 meters or more is recommended, with vortex pumps and jet pumps being more preferable. The discharge flow rate of an electric pump is, for example, approximately 5 to 100 liters per minute, but for general household use, a pump with a flow rate characteristic of approximately 5 to 50 liters per minute is preferable.

[0018] The first raw water inlet pipe 7a, the second raw water inlet pipe 7b, the purified water discharge pipe 10, and the wastewater drain pipe 8 may be made of any material and have any structure that can withstand the water pressure of the electric pump 4. Specifically, for example, straight pipes or pipe fittings made of polyvinyl chloride resin or steel pipes, or composite materials of these, can be used in view of durability and ease of processing. The nominal diameter is preferably large to reduce head loss; for example, a nominal diameter of 13 to 50 millimeters and a thickness of approximately 1 to 5 millimeters are preferred. If it is difficult to select materials that can withstand the maximum pressure of the electric pump 4, it is advisable to install a pressure reducing valve, pressure regulating valve, or relief valve between the electric pump 4 and the water treatment device 1. (distribution head) Next, the configuration of the distribution head and the entire flow path will be described with reference to FIGS.

[0019] The distribution head 5 connects the drug supply unit 3 and the filtration unit 2. Specifically, the distribution head 5 is fixed to the top of the filtration unit 2, and the drug supply unit 3 is fixed to the top of the distribution head 5, and the drug supply unit 3, distribution head 5, and filtration unit 2 are integrally formed. The drug supply unit 3 is supported by the distribution head 5 and the filtration unit 2. This allows the drug supply unit 3 to be supported by the distribution head 5 and the filtration unit 2. Therefore, the drug supply unit 3 can be supported above the filtration unit 2, eliminating the need for a separate component to support the drug supply unit 3 above the filtration unit 2. Supporting the drug supply unit 3 above the filtration unit 2 reduces the load on the electric pump 4. The horizontal cross-sectional shapes of the drug supply unit 3, distribution head 5, and filtration unit 2 are circular, and the central axes extending in the up-down direction of the drug supply unit 3, distribution head 5, and filtration unit 2 are aligned on the same line. The horizontal dimension of the filtration unit 2 is greater than the horizontal dimension of the drug supply unit 3 and distribution head 5. The weight of the filtration unit 2 is greater than the weight of the drug supply unit 3 and distribution head 5. As a result, the drug supply unit 3, distribution head 5, and filtration unit 2, which are integrally formed, are configured such that the lower portion is laterally larger and heavier than the upper portion, making them less likely to tip over.

[0020] The distribution head 5 has a first communication passage 51 and a second communication passage 52 therein. The first communication passage 51 is a passage that connects a chemical outlet 38 of the chemical supply unit 3 (described later) with an inlet 24 of the filtration unit 2 (described later). The second communication passage 52 is a passage that connects an outlet 25 of the filtration unit 2 (described later) with the second raw water inlet pipe 7b and the purified water outlet pipe 10. The flow direction of the water flowing through the first communication passage 51 and the second communication passage 52 can be changed by opening and closing each valve. (whole flow path) Next, the overall flow path will be described.

[0021] Figure 1 is a schematic diagram showing the flow of water during filtration.

[0022] As shown in FIG. 1, during filtration, the first valve 11 is opened, the second valve 12 is closed, and the third valve 13 is closed, allowing raw water to pass through as follows.

[0023] [Flow path during filtration] First raw water inlet pipe 7a (first valve 11) → first chemical branching section 40 (inside chemical supply section 3) → first communication passage 51 (inside distribution head 5) → filtration section 2 (inlet 24 → outlet 25) → second communication passage 52 → purified water discharge pipe 10 A detailed description of the functions and flow paths of the chemical supply unit 3 and the filtration unit 2 will be provided later. During filtration, as raw water passes through the first raw water inlet pipe 7a (first valve 11) → first chemical branching unit 40 → distribution head 5 in this order, chemicals are added in the chemical supply unit 3, and as raw water passes through the inlet 24 → outlet 25 in this order, contaminants in the raw water are captured in the filtration unit 2. When connecting the water treatment device 1 to another water treatment device, the water treatment device 1 is connected upstream of the other water treatment device. The other water treatment device, like the water treatment device 1, is configured to perform filtration and backwashing. Here, the other water treatment device is referred to as the downstream water treatment device 6. The purified water discharge pipe 10 of the water treatment device 1 is connected to the downstream water treatment device 6 so that water flows from the water treatment device 1 to the downstream water treatment device 6. As a result, contaminants that could not be captured by the water treatment device 1 are captured in the downstream water treatment device 6, downstream of the water treatment device 1, thereby achieving the desired filtration performance.

[0024] FIG. 4 is a schematic diagram showing the flow of water during backwashing treatment in the water treatment device 1 of this embodiment.

[0025] As shown in FIG. 4, during backwashing, the first valve 11 is closed, the second valve 12 is open, and the third valve 13 is open, allowing raw water to pass through as follows. [Flow path during backwashing] Second raw water inlet pipe 7b (second valve 12) → second communication passage 52 (inside distribution head 5) → filtration section 2 (outlet 25 → inlet 24) → first communication passage 51 (inside distribution head 5) → first chemical branch section 40 (inside chemical supply section 3) → wastewater drain pipe 8 (third valve 13) As will be described in more detail later, during backwashing, water flows from the outlet 25 to the inlet 24 in that order, thereby discharging dirt from within the filtration section 2.

[0026] The water treatment device 1 of this embodiment can perform a "bypass operation" to supply raw water from the water treatment device 1 to the downstream water treatment device 6 while ensuring the required flow rate when the downstream water treatment device 6 is installed downstream of the water treatment device 1. Figure 3 is a schematic diagram showing the water flow during bypass operation of the water treatment device 1 of this embodiment. The purified water discharge pipe 10 is connected to the downstream water treatment device 6.

[0027] As shown in FIG. 3, during bypass operation, the first valve 11 is closed, the second valve 12 is open, and the third valve 13 is closed, allowing raw water to pass through as follows. [Flow path during bypass operation] Second raw water inlet pipe 7b (second valve 12) → purified water outlet pipe 10 When backwashing the downstream water treatment device 6 downstream of the water treatment device 1, it is necessary to supply raw water without reducing the flow rate of raw water. Therefore, by bypass operation, water in the second raw water inlet pipe 7b flows directly into the purified water discharge pipe 10, and raw water can be supplied from the purified water discharge pipe 10 to the downstream water treatment device 6.

[0028] Furthermore, a large flow rate is required for bypass operation. Specifically, the raw water inlet pipe 7b and purified water outlet pipe 10, which are the bypass operation flow paths, are formed linearly and integrally, and have the same cross-sectional shape. The central axis of the second raw water inlet pipe 7b and the central axis of the purified water outlet pipe 10 may be aligned on the same line. For example, the second valve 12 should be a full-bore ball valve or other valve with a cross-sectional shape equivalent to that of the other pipes. If the cross-sectional shape cannot be maintained constant, the cross-sectional area of ​​the bypass operation flow path should be within ±10%. By maintaining a constant cross-sectional shape (constant cross-sectional area) and arranging the pipes linearly, the raw water flow resistance is eliminated, allowing a large flow rate of raw water to be supplied from the water treatment device 1 to the downstream water treatment device 6. On the other hand, since a high flow rate is not required during filtration, the filtration flow path has multiple bends. (filtration section) Next, the filtration section 2 will be described with reference to FIG.

[0029] FIG. 5 is a cross-sectional view of the filtration section 2.

[0030] The filtration unit 2 includes a bottomed cylindrical tank 20 with an opening at the top, a filter material, and a water collection pipe 21. The raw water passes through the tank and is purified. The filter material in the filtration unit 2 is composed of an upper layer 22, which primarily filters out impurities, and a lower layer 23, which has a flow-straightening function. The filter material used in the upper layer 22 is activated carbon, manganese sand, anthracite, etc., and approximately one to four types are used in layers depending on the raw water quality. In the filtration unit 2 of this embodiment, the filtering action is centered on the upper layer 22. The filter material used in the lower layer 23 is composed of gravel or coarse-pore resin, etc., to disperse the water flowing in and out of the water collection pipe 21. The lower layer 23 includes a relatively large-grained gravel layer at the bottom to improve water flow and prevent the filter material from leaking out from the bottom of the water collection pipe 21. The amount of filter material in the lower layer 23 should be approximately 1 / 2 to 1 times the diameter of the filtration unit 2. The combined filling amount of the filter material in the upper layer 22 and the lower layer 23 is preferably about 1 / 4 to 4 / 5 times the internal volume of the filtration section 2.

[0031] The filtration unit 2 has an inlet 24 and an outlet 25 at the opening on the top surface, and the outlet 25 is connected to the water collection pipe 21. As described above, the inlet 24 and the outlet 25 are connected to the first communication passage 51 and the second communication passage 52 of the distribution head 5, respectively.

[0032] During the filtration process, water flows in the filtration unit 2 as follows, and purified water is obtained from the outlet 25.

[0033] [Flow path within filtration unit 2 during filtration process] Inlet 24 → Upper layer 22 → Lower layer 23 → Water collection pipe 21 → Outlet 25 Furthermore, backwashing can be used to discharge dirt accumulated during the filtration process in the filtration unit 2. During backwashing, water flows as follows, and dirt is discharged from the inlet 24.

[0034] [Flow path in filtration section 2 during backwashing process] Outlet 25 → Water collection pipe 21 → Lower layer 23 → Upper layer 22 → Inlet 24 (Pharmaceutical Supply Department) Next, the medicine supply unit 3 will be described with reference to FIGS.

[0035] Figure 6 is a plan view of water treatment device 1 without filtration unit 2. Figure 7 is a cross-sectional view taken along the line A-A of first raw water inlet pipe 7a, chemical supply unit 3, and distribution head 5 of water treatment device 1. Using this figure, we will explain how chemicals are added in chemical supply unit 3 when raw water passes through "first raw water inlet pipe 7a (first valve 11) → first chemical branching unit 40 → distribution head 5" in this order during filtration treatment, and the structure of chemical supply unit 3.

[0036] The chemical supply unit 3 is provided to promote the aggregation of metal ions contained in the raw water by the chemical placed therein, making it easier for the filtration unit 2 to capture them.

[0037] The medicine supply unit 3 has a medicine placement section 31, a medicine path 32, a recovery section 33, a first medicine flow path 34, and a second medicine flow path 35 inside a cylindrical housing 30 with a bottom.

[0038] The housing 30 is composed of a bowl-shaped base 30a provided at the bottom, a generally cylindrical upper cover 30b that covers the base 30a, and a lid 36 that closes the upper opening of the upper cover 30b. The lid 36 is detachable from the upper opening of the upper cover 30b.

[0039] Drug placement section 31 is installed in the upper part of housing 30, and drug path 32 rises vertically from the bottom surface of housing 30 and is connected to drug placement section 31. Recovery section 33 is located in the lower part of housing 30 and is provided on the outer periphery of drug path 32.

[0040] A first raw water inlet pipe 7a and a wastewater drain pipe 8 are connected to the base 30a of the chemical supply unit 3. Inside the housing 30 of the chemical supply unit 3 is a first chemical flow path 34, which is a flow path connecting the first raw water inlet pipe 7a (first valve 11) and the wastewater drain pipe 8 (third valve 13).

[0041] The base 30a of the drug supply unit 3 has a drug outlet 38 that opens downward. Inside the housing 30 of the drug supply unit 3 is a second drug flow path 35 that is a flow path that connects the drug outlet 38 and the recovery unit 33. The drug outlet 38 is connected to a first communication path 51 of the dispensing head 5.

[0042] The first chemical flow path 34 has a second chemical branch section 41 that communicates with the chemical path 32. The second chemical branch section 41 is a flow path that connects the first raw water inlet pipe 7a (first valve 11), the wastewater drain pipe 8 (third valve 13), and the chemical path 32.

[0043] First chemical flow path 34 has first chemical branch section 40 that communicates with second chemical flow path 35 on the side of wastewater drain piping 8 (third valve 13) of second chemical branch section 41 in first chemical flow path 34. First chemical branch section 40 is a flow path that communicates second chemical branch section 41, collection section 33, wastewater drain piping 8 (third valve 13), and chemical outlet 38.

[0044] The first drug flow path 34 includes a first drug branching portion 40 and a second drug branching portion 41 in the first drug flow path 34. Between them is a throttle section 37. The throttle section 37 is the flow path with the smallest cross-sectional area in the first chemical flow path 34. The throttle section 37 is provided to branch the raw water that flows into the chemical supply section 3 and adjust the chemical solution to the required concentration. The recovery section 33 is provided at the bottom inside the housing 30, on the outer periphery of the chemical path 32.

[0045] Chemical path 32 is a small-diameter pipe that stands upright and has chemical placement section 31 at the top. Chemical path 32 has a smaller diameter midway and chemical placement section 31 is provided at the top of chemical path 32, thereby enabling raw water to come into contact with chemicals at a desired flow rate. Chemical placement section 31 is sized to ensure the amount (number) of chemicals to be placed so that a chemical solution of a desired concentration can be obtained for the flow rate of raw water.

[0046] In filtration mode, raw water flows from first raw water inlet pipe 7a (first valve 11) into chemical supply unit 3 and branches at second chemical branch 41 into chemical path 32 and first chemical branch 40. The water flows into chemical path 32, comes into contact with the chemical at chemical placement unit 31, and dissolves the chemical. The water then passes around the outer periphery of chemical path 32 and is collected in collection unit 33. It then passes through second chemical flow path 35 and merges with the water that branched at second chemical branch 41 at first chemical branch 40. The raw water that merged at first chemical branch 40 flows out of chemical supply unit 3 into first communication passage 51 of distribution head 5.

[0047] The diameter of chemical path 32 is small and a sufficient distance is secured between it and the inner wall surface of housing 30, so that the liquid level of the raw water containing dissolved chemicals that flows down into housing 30 can be set to about half or less than the height of housing 30. By storing the raw water containing dissolved chemicals at a desired depth within housing 30, the ratio at which the raw water is mixed with the dissolved chemicals at first chemical branch section 40 can be adjusted.

[0048] Furthermore, the flow rate of raw water coming into contact with the chemical in chemical placement section 31 can be adjusted by the flow rate of raw water flowing through throttle section 37. That is, by adjusting the diameter of throttle section 37, the flow rate ratio of raw water branched at second chemical branch section 41 can be adjusted. In this way, the chemical concentration in first chemical branch section 40 after merging can be adjusted to the desired concentration.

[0049] By keeping the amount of raw water flowing into the chemical supply section 3 within a predetermined range and setting the liquid level in the chemical supply section 3 to the desired height, the chemical concentration in the raw water flowing out of the chemical supply section 3 can be adjusted to within the desired range.

[0050] The drug placement section 31 is provided with a water-soluble, solid drug 60. It is preferable to use a tablet or granular drug 60 because this increases the surface area of ​​the drug 60 and allows for a stable drug concentration. For tablets, a diameter of approximately 30 mm and a height of 10 to 20 mm is recommended, while for granules, a diameter of 5 to 15 mm is recommended. If the drug 60 is small, adjacent drugs may come into contact with water at the same time and stick together. This sticking may result in only the lower parts of the drugs coming into contact with water, making it impossible to obtain a drug solution of the desired concentration. Alternatively, if the drug 60 is small, the contact area with the water supplied from the drug path 32 increases, making it impossible to obtain a drug solution of the desired concentration. Therefore, the drug 60 of the above-mentioned size is used to supply a drug solution of the desired concentration.

[0051] As described above, chemical 60 oxidizes metal ions contained in the raw water to form flocculants that are difficult to dissolve in water. Various chemicals can be used as chemical 60, but a flocculant such as PAC (polyaluminum chloride) may also be used depending on the desired water purification performance. When adding chemical 60 to raw water, chemical 60 that is easily soluble in water is preferred, but chemical 60 that remains solid and does not flow out of chemical placement unit 31 during shutdown or backwash treatment, i.e., when chemical addition is interrupted, is preferred. In this embodiment, trichloroisocyanuric acid is used.

[0052] It is advisable to ensure that an air layer always exists within the housing 30 of the chemical supply unit 3. Because the housing 30 is an enclosed space, once the air is removed and the housing 30 is filled with water, the chemical 60 will always be in contact with the water and continue to dissolve. The water treatment device 1 of this embodiment is configured so that air enters when the lid 36 of the chemical supply unit 3 is removed. The operation of removing the lid 36 of the chemical supply unit 3 is mainly performed when replenishing the chemical 60 that has gradually decreased due to dissolution into the raw water.

[0053] Because each component of the drug supply unit 3 may be in contact with the drug for an extended period of time, it is recommended to select materials with low drug reactivity, such as PVC (polyvinyl chloride), PMMA (polymethyl methacrylate), or PP (polypropylene). Meanwhile, since the drug path 32 needs to be strong enough to support the drug placement unit 31, materials such as polyvinyl chloride or ABS (acrylonitrile butadiene styrene), which are stronger than PP, are preferably selected for the drug path 32 in consideration of drug compatibility. The outer diameter of the drug path 32 should be no more than one-fourth the inner diameter of the base 30a and upper cover 30b. As mentioned above, a space (collection unit 33) for temporarily storing the solution after drug supply can be provided outside the drug path 32, preventing the water level in the housing 30 from rising too rapidly and reaching the drug placement unit 31. For example, if the inner diameter of the base 30a is 130 mm, a PVC pipe with an outer diameter of approximately 25 to 40 mm should be used. (Pipe and valve positioning) Next, the piping structure will be described.

[0054] FIG. 2 is a perspective view of the chemical supply unit, distribution head, filtration unit, first valve, second valve, and third valve of the water treatment device 1 of this embodiment.

[0055] The first raw water inlet pipe 7a extends from the chemical supply unit 3 to one side in the left-right direction (left side in FIG. 1 ), and the second raw water inlet pipe 7b extends from the distribution head 5 to one side in the left-right direction (left side in FIG. 1 ). The wastewater drain pipe 8 extends from the chemical supply unit 3 to the other side in the left-right direction (right side in FIG. 1 ), and the purified water outlet pipe 10 extends from the distribution head 5 to the other side in the left-right direction (right side in FIG. 1 ). This shortens the connecting piping from the electric pump 4 to the first raw water inlet pipe 7a and the second raw water inlet pipe 7b, enabling a more compact product. Similarly, because the second raw water inlet pipe 7b and the purified water outlet pipe 10 extend in opposite directions, the second raw water inlet pipe 7b and the purified water outlet pipe 10 can be arranged in a straight line, minimizing piping resistance during bypass operation. Note that the central axes of the second raw water inlet pipe 7b and the purified water outlet pipe 10 may be arranged in a straight line. Furthermore, the first valve 11 is disposed above the second valve 12. This allows the three types of valves to be disposed on the same plane, improving usability.

[0056] In addition, between the third valve 13 and the chemical supply section in the wastewater drain piping 8, there is a first separation section 90 which allows the third valve 13 to be maintained, and by having a second separation section 91 in the purified water discharge piping 10, the water treatment device 1 and the downstream water treatment device 6 downstream of the water treatment device 1 are separated, and each water treatment device can be maintained individually when replacing the filter material, etc. [Industrial Applicability]

[0057] The water treatment device of the present invention is capable of supplying chemical solutions of stable concentrations and has stable filtration performance, and is therefore useful as a small household water treatment device used to purify well water and stored water. [Explanation of symbols]

[0058] 1. Water treatment equipment 2 Filtration section 3. Drug Supply Department 4 Electric pump 5 distribution head 6. Downstream water treatment equipment 7a 1st raw water inflow pipe 7b 2nd raw water inflow pipe 8 Drain piping 10 Purified water discharge piping 11 First Valve 12 Second valve 13 Third valve 20 Tank 21 Water collection pipe 22 Upper layer 23 Lower layer 24 Inlet 25 Outlet 30 Case 30a base 30b Top cover 31 Drug placement section 32 Drug Route 33 Recovery Department 34 First drug flow path 35 Second drug flow path 36 Lid 37 Constriction section 38 Drug outlet 40 First drug branch 41 Second drug branch 51 1st communication passage 52 2nd communication passage 60 Drugs 90 First separation section 91 Second separation section

Claims

1. A water treatment device that filters raw water from a water source and extracts purified water, A first raw water inlet pipe and a second raw water inlet pipe for supplying raw water from the water source; a chemical supply unit connected to the first raw water inlet pipe and supplying a chemical to water supplied from the first raw water inlet pipe; A filtration section containing a filter material; A purified water discharge pipe that takes out treated water filtered by the filtration unit; a drainage pipe for extracting backwash water used to clean the filtration unit from the chemical supply unit; a first communication passage that communicates the filtering unit with the drug supply unit; a second communication passage that communicates the filtration unit with the purified water discharge pipe and the filtration unit with the second raw water inlet pipe; a first valve provided in the first raw water inlet pipe for opening and closing a flow path; a second valve provided in the second raw water inlet pipe for opening and closing a flow path; a third valve provided in the wastewater drain pipe for opening and closing a flow path, During a filtration process for filtering raw water, the first valve is opened and the second valve and the third valve are closed. During a backwash process for cleaning the filtration unit, the second valve and the third valve are opened and the first valve is closed. the drug supply unit and the filtering unit are connected by a dispensing head; the dispensing head has the first communication passage and the second communication passage therein; When the second valve is opened and the first valve and the third valve are closed, raw water flows directly from the second raw water inlet pipe to the purified water outlet pipe.

2. The dispensing head is disposed above the filtering section; the drug supply is disposed on top of the dispensing head; The water treatment device according to claim 1 , wherein the chemical supply unit, the distribution head, and the filtration unit are integrally formed.

3. The water treatment device according to claim 2 , further comprising a first separation section between the third valve and the chemical supply section in the wastewater drain pipe, the first separation section enabling maintenance of the third valve.

4. The first raw water inlet pipe extends from the chemical supply unit to one side in the left-right direction, The second raw water inlet pipe extends from the distribution head to one side in the left-right direction, the drain pipe extends from the drug supply unit to the other side in the left-right direction, The water treatment device according to claim 2 or 3, wherein the purified water discharge pipe extends from the second raw water inlet pipe to the other side in the left-right direction.

5. The water treatment device according to claim 4, wherein the raw water inlet pipe and the purified water outlet pipe are integrally formed and have the same cross-sectional shape.

6. The water treatment device according to claim 5 , wherein a central axis of the raw water inlet pipe and a central axis of the purified water outlet pipe are aligned on the same line.

7. The water treatment device according to claim 5 , wherein the first valve is disposed above the second valve.

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