Filtration units, packings and water purification systems

Abstract

To easily adjust the residual chlorine concentration in purified water by changing the configuration of the water purification system itself. [Solution] The water purification system S1 includes a chemical substance removal filter 311, a housing 312 that has an upper end opening that is closed by a head unit 101 and that houses the chemical substance removal filter 311, and a packing 313 that closes the gap between a boundary wall portion 118 formed on the lower surface of the head unit 101 and the upper end surface of the chemical substance removal filter 311. The inside of the housing 312 is separated by the chemical substance removal filter 311 into an untreated water filled portion C21 and a purified water filled portion C22, and the packing 313 has a water passage 331 that communicates between the untreated water filled portion C21 and the purified water filled portion C22.

Description

[Technical field]

[0001] The present invention relates to a filtration unit, a packing and a water purification system. [Background technology]

[0002] Tap water contains residual chlorine for disinfection purposes, and in the case of a water purification system that uses a filter medium, the chlorine concentration is reduced by the capacity of the filter medium alone. Regulations regarding the residual chlorine concentration in tap water, which is the target of purification, vary depending on the region, etc., and reducing the chlorine concentration using only the capacity of the filter media may result in excessive reduction. To deal with such situations, conventional water purification systems are provided with a residual chlorine adjustment mechanism such as a dial or lever in the main body of the water purification system, and this mechanism adjusts the residual chlorine concentration in the purified water. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Patent No. 4253351 Summary of the Invention [Problem to be solved by the invention]

[0004] Conventional mechanisms for adjusting the residual chlorine concentration have a complex structure and are not easy to adjust. Therefore, the present invention provides a filtration unit, gasket, and water purification system that allow the residual chlorine concentration to be easily adjusted without the need for a special adjustment mechanism such as a dial or lever. [Means for solving the problem]

[0005] The chemical substance removal unit of the present invention is a chemical substance removal unit that is attached to a head unit having a raw water inlet and a purified water outlet to remove chemical substances contained in the raw water, and comprises: a chemical substance removal filter that removes chemical substances; a housing that has an upper end opening that is closed by the head unit and that houses the chemical substance removal filter, and is internally separated into an untreated water filling section that is filled with untreated water before removal by the chemical substance removal filter and a purified water filling section that is filled with purified water after removal by the chemical substance removal filter; and a gasket that is arranged between a boundary wall section formed on the underside of the head unit and the upper end surface of the chemical substance removal filter facing the boundary wall section, and seals the gap between the boundary wall section and the upper end surface, and the gasket has a water passage that connects the untreated water filling section and the purified water filling section, and allows a portion of the untreated water to flow from the untreated water filling section to the purified water filling section without passing through the chemical substance removal filter. According to this configuration, by forming a water passage in the gasket interposed between the head unit and the chemical substance removal filter, a means is formed that allows untreated water before removal by the chemical substance removal filter to be mixed with purified water in a simple configuration, thereby adjusting the residual chlorine concentration.

[0006] The chemical substance removal filter of the present invention is cylindrical, the gasket is annular and covers the upper end surface of the chemical substance removal filter radially by a predetermined width, and the water passage extends radially of the gasket to connect the untreated water filling section and the purified water filling section. The packing of the present invention ensures communication between the untreated water filling section and the purified water filling section even if there is a radial misalignment in position relative to the chemical substance removal filter.

[0007] The water passage of the present invention may be a groove or a through hole formed in the thickness direction of the packing. The packing of the present invention satisfactorily ensures communication between the untreated water filled section and the purified water filled section.

[0008] The water passage of the present invention may be formed in a radially extending elongated hole of the packing. The water passage of the present invention suppresses distortion that occurs in the shape of the packing when the housing is attached to the head unit.

[0009] The packing of the present invention may be configured so as to be detachable from the chemical substance removal filter. The packing of the present invention allows for easy replacement with new packing or packing having a different flow area.

[0010] The packing of the present invention may have a plurality of cutout portions that are provided so as to be individually removable, and may be configured so that a water passage can be formed by removing one or more of the cutout portions. The gasket of the present invention makes it possible to adjust the amount of untreated water flowing from the untreated water filling section to the purified water filling section by changing the actual cutting sections and the number of cutting sections while using a single gasket, thereby optimizing the residual chlorine concentration.

[0011] The water passage of the present invention is a through hole formed in the thickness direction of the packing, and may be formed inclined in the opposite direction to the direction of rotation of the housing when attached to the head unit. The water passage of the present invention prevents excessive tilt of the water passage after installation by rotating and screwing the housing while the gasket is pressed against the head unit, when the head unit is attached to a screw-type head unit.

[0012] The packing of the present invention may have protrusions that protrude radially inward on both sides of its inner circumferential edge that sandwich the water passage in the circumferential direction. The gasket of the present invention has a protrusion that suppresses radial misalignment of the gasket relative to the head unit, thereby ensuring a radial gap between the inner edge of the gasket and the head unit, and maintaining a smooth flow of untreated water through the water passage.

[0013] The water purification system of the present invention includes a head unit having a raw water inlet and a purified water outlet, a foreign matter filtering unit for removing foreign matter contained in the raw water, and any one of the above chemical substance removal units for removing chemical substances. The foreign matter filtering unit includes a foreign matter removal filter for removing foreign matter, and a housing that accommodates the foreign matter removal filter and the chemical substance removal filter, and the housing is internally separated by the foreign matter removal filter and the chemical substance removal filter into a raw water filling section filled with raw water before removal by the foreign matter removal filter, a primary filtrate filling section that is an untreated water filling section or communicates with the untreated water filling section and is filled with primary filtrate after removal by the foreign matter removal filter, and a purified water filling section, and the head unit is attached in a state where the raw water filling section communicates with the inlet and the purified water filling section communicates with the outlet. The packing allows a portion of the primary filtrate to flow from the untreated water filling section to the purified water filling section without passing through the chemical substance removal filter. This configuration prevents an excessive decrease in the residual chlorine concentration in the purified water after removal by the chemical substance removal filter.

[0014] The water purification system of the present invention may have a first and a second housing that can be individually attached to the head unit, the first housing containing a foreign matter removal filter and the inside of which is separated into a raw water filling section and a primary filtrate water filling section by the foreign matter removal filter, and the second housing containing a chemical substance removal filter and the inside of which is separated into an untreated water filling section and a purified water filling section by the chemical substance removal filter, and the head unit further has a communication passage that communicates between the primary filtrate water filling section and the untreated water filling section. The housing of the present invention makes it possible to replace the chemical substance removal filter and packing as a single filtration unit.

[0015] The water purification system of the present invention is a water purification system that removes foreign matter from raw water and removes chemical substances including chlorine from primary filtrate water after the foreign matter removal to produce purified water, and includes a head unit having a raw water inlet and a purified water outlet, a foreign matter removal filter that removes foreign matter, a chemical substance removal filter that removes chemical substances, a first housing that is detachably attached to the head unit and contains the foreign matter removal filter, a second housing that is provided to be attachable to the head unit separately from the first housing and contains the chemical substance removal filter, and a packing that is arranged between a boundary wall portion formed on the lower surface of the head unit and an upper end surface of the chemical substance removal filter that faces the boundary wall portion. The first housing is internally separated by the foreign matter removal filter into a raw water filling portion filled with raw water before removal by the foreign matter removal filter and a primary filtrate water filling portion filled with primary filtrate water after removal by the foreign matter removal filter, and is attached to the head unit with the raw water filling portion communicating with the inlet. The second housing is separated by the chemical substance removal filter into an untreated water filling section filled with untreated water before removal by the chemical substance removal filter and a purified water filling section filled with purified water after removal by the chemical substance removal filter, and is attached to the head unit with the purified water filling section communicating with the outlet. The head unit further has a communication passage that communicates the primary filtrate water filling section with the untreated water filling section, and the packing has a water passage that communicates the untreated water filling section with the purified water filling section, and allows a portion of the untreated water to flow from the untreated water filling section to the purified water filling section without passing through the chemical substance removal filter. This configuration prevents an excessive decrease in the residual chlorine concentration in the purified water after removal by the chemical substance removal filter. Furthermore, by configuring the second housing so that it can be attached to the head unit separately from the first housing, it becomes possible to replace the filters (foreign matter removal filter, chemical substance removal filter) and packing for each housing. Effect of the Invention

[0016] The chemical substance removal unit, packing, and water purification system of the present invention have the effect of making it possible to easily adjust the residual chlorine concentration of purified water through the configuration of the water purification system itself. [Brief description of the drawings]

[0017] [Figure 1] 1 is a schematic diagram showing a water purification system according to one embodiment of the present invention. [Diagram 2] 1 is a vertical cross-sectional view showing a main body of a water purification system according to one embodiment of the present invention. [Diagram 3] FIG. 2 is a diagram showing a first bracket portion (or a second bracket portion) of the water purification system according to one embodiment of the present invention, where (a) is a side view and (b) is a bottom view. [Figure 4] 1A and 1B are a vertical half-sectional view and a top view, respectively, showing an enlarged view of an upper end portion of a chemical substance removal filter used in a water purification system according to one embodiment of the present invention. [Diagram 5] 1A and 1B are diagrams showing a packing according to one embodiment of the present invention, in which (a) is a plan view and (b) is a side view. [Figure 6] FIG. 2 is an explanatory diagram of the operation of the water purification system according to one embodiment of the present invention. [Figure 7] 13(a) and 13(b) are plan views showing other examples of packing applicable to the water purification system according to one embodiment of the present invention. [Figure 8] 1A and 1B are a plan view and a cross-sectional view, respectively, showing a first modified example of a packing according to an embodiment of the present invention, and a cross-sectional view of the packing after application to a chemical substance removal unit, respectively, shown in FIG. [Figure 9] FIG. 13A is a plan view showing a second modified example of a packing according to an embodiment of the present invention, and FIG. 13B is a plan view showing another embodiment of the packing. [Figure 10] 11A and 11B are plan views showing a third modified example of the packing according to an embodiment of the present invention, in which (a) shows the state before use and (b) shows the state during use. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0018] Hereinafter, an embodiment of the water purification system of the present invention will be described with reference to the drawings. The dimensions of each part in the drawings used in the following description are not necessarily the same as the actual dimensions, and can be changed as appropriate.

[0019] (Overall configuration of water purification system) FIG. 1 is a schematic diagram showing a water purification system S1 according to a first embodiment of the present invention. The water purification system S1 according to the first embodiment of the present invention removes foreign matter from tap water, which is raw water, and also removes chemical substances, including chlorine, from the primary filtrate after the foreign matter removal to produce purified water.

[0020] The water purification system S1 is a so-called built-in water purification system, and is also called a central water purification system. The water purification system S1 is installed, for example, between a water meter and the boundary between indoors and outdoors in each home. As a result, the water purification system S1 receives tap water via a water meter and removes foreign objects and chemicals contained in the tap water. The purified water after processing by the water purification system S1 can be used for drinking or as hot water by passing it through an indoor water supply pipe or by heating it through a water heater and obtaining it from a terminal water supply valve such as a faucet. In the following description, water before treatment by the water purification system S1 (i.e., tap water) is referred to as raw water, and water after treatment by the water purification system S1 is referred to as purified water.

[0021] The water purification system S1 comprises a raw water side T-pipe 11, a raw water side ball valve 12, a raw water side joint pipe 13, a raw water side L-shaped pipe 14, a water purification system main body 1, a purified water side L-shaped pipe 21, a purified water side joint pipe 22, a purified water side ball valve 23, a purified water side T-pipe 24, a bypass pipe 31 and a bypass ball valve 32.

[0022] The raw water T-pipe 11 constitutes the inlet of the water purification system S1 and is connected to a water meter via an outdoor water intake pipe (not shown). The water meter is connected to a water pipe, and the water purification system S1 receives a supply of raw water via the raw water T-pipe 11.

[0023] The raw water side ball valve 12 is positioned downstream of the raw water side T-pipe 11 in the direction of flow of water (i.e., raw water and purified water) in the water purification system S1, and opens and closes the flow path of raw water toward the water purification system main body 1, which will be described later.

[0024] The raw water side joint pipe 13 is connected to the downstream side of the raw water side ball valve 12 and connects the raw water side ball valve 12 and the water purification system main body 1. In this embodiment, a raw water side L-shaped pipe 14 is interposed between the raw water side joint pipe 13 and the water purification system main body 1, and the raw water side joint pipe 13 connects the raw water side ball valve 12 and the water purification system main body 1 via the raw water side L-shaped pipe 14. The raw water side joint pipe 13 and the raw water side L-shaped pipe 14 are connected via a connector such as a universal joint.

[0025] The water purification system main body 1 filters raw water to remove foreign matter and chemical substances from the raw water and produce purified water. The main objects to be removed by the water purification system main body 1 are foreign matter such as rust and dust, and chemical substances such as trihalomethanes and residual chlorine. The configuration of the water purification system main body 1 will be described in detail later.

[0026] The purified water side piping of the water purification system S1 is configured symmetrically to the raw water side piping. It includes a purified water side L-shaped pipe 21, a purified water side joint pipe 22, a purified water side ball valve 23, and a purified water side T-shaped pipe 24. The water purification system main body 1 and the purified water side ball valve 23 are connected via the purified water side L-shaped pipe 21 and the purified water side joint pipe 22. The purified water side L-shaped pipe 21 and the purified water side joint pipe 22 are connected via a connector such as a universal joint.

[0027] The purified water side ball valve 23 opens and closes the flow path of purified water coming out of the water purification system main body 1.

[0028] The purified water side T-shaped pipe 24 constitutes the outlet of the purified water system S1 and is connected to an indoor water supply pipe (not shown). The purified water system S1 is connected to a terminal water supply valve such as a faucet as well as a water heater and the like via this indoor water supply pipe.

[0029] In addition to the above, the water purification system S1 includes a bypass pipe 31 and a bypass ball valve 32.

[0030] The bypass pipe 31 connects the raw water side T-pipe 11 and the purified water side T-pipe 24 .

[0031] The bypass ball valve 32 is interposed in the bypass pipe 31 and opens and closes the flow path of the raw water flowing through the bypass pipe 31, in other words, the raw water flowing from the raw water side T-pipe 11 to the purified water side T-pipe 24.

[0032] The water purification system S1 is attached to the outdoor water intake pipe with the raw water side ball valve 12 and the purified water side ball valve 23 closed and the bypass ball valve 32 open. After installation to the outdoor water intake pipe is complete, the bypass ball valve 32 is closed and the raw water side ball valve 12 and the purified water side ball valve 23 are opened, allowing the raw water to pass through the water purification system main body 1, and the filtration process of the raw water by the water purification system S1 begins.

[0033] (Configuration of the water purification system main body) FIG. 2 is a vertical cross-sectional view showing a water purification system main body 1 which is a main part of the water purification system S1 according to this embodiment.

[0034] The water purification system main body 1 includes a head unit 101, a foreign matter filtering unit 201, and a chemical substance removing unit 301. In this embodiment, the foreign matter filtering unit 201 and the chemical substance removing unit 301 are provided as separate or independent units. The foreign matter filtering unit 201 is disposed upstream, and the chemical substance removing unit 301 is disposed downstream of the foreign matter filtering unit 201. That is, the treatment by the chemical substance removing unit 301 follows the treatment by the foreign matter filtering unit 201.

[0035] The foreign matter filtering unit 201 removes foreign matter such as rust and dirt from the raw water. The chemical substance removing unit 301 removes chemical substances such as trihalomethanes and residual chlorine from the water after the foreign matter has been removed by the foreign matter filtering unit 201 (hereinafter referred to as the "primary filtrate").

[0036] The configurations of the head unit 101, the foreign matter filtering unit 201, and the chemical substance removing unit 301 will be described below in order.

[0037] (Head unit) The head unit 101 comprises a first bracket portion 102 for mounting and fixing the foreign matter filtering unit 201, a second bracket portion 103 for mounting and fixing the chemical substance removal unit 301, and a connecting pipe 110 connecting the first bracket portion 102 and the second bracket portion 103.

[0038] As shown in Figures 3(a) and (b), the first bracket portion 102 has a spherical cap portion 104 that is circular in a plan view and has both an upper surface 104a and a lower surface 104b that bulge slightly outward, and a water passage pipe portion 105 that is integrally formed with the cap portion 104.

[0039] As shown in Figures 2 and 3(b), cap portion 104 is formed with an outer tube portion 117 formed on the underside at a position a predetermined distance inward from its outer peripheral edge, a boundary wall portion 118 formed in the central part of the underside of cap portion 104, and an inner tube portion 119 formed a predetermined distance inward from boundary wall portion 118.

[0040] The outer cylinder portion 117, the boundary wall portion 118 and the inner cylinder portion 119 are provided in the form of concentric cylinders with a common axis that is a vertical line passing through the center of the circular shape of the cap portion 104 in a plan view. As shown in FIG. 3(a), the outer tube portion 117 has a male threaded portion on its outer peripheral surface, and is a part to which the upper end of the foreign matter filtering unit 201 is attached by screwing, and hangs down with a predetermined protruding dimension approximately along the outer peripheral edge of the cap portion 104 of the first bracket portion 102.

[0041] 2 and 3(b), the boundary wall 118 hangs down with a predetermined protruding dimension from the center of the lower surface of the cap portion 104 at a certain distance from the inner circumferential surface of the outer tube portion 117. The boundary wall 118 abuts at its tip against the upper end surface of the foreign matter removal filter 211 described below, forming a wall that separates the inside and outside of the foreign matter removal filter 211. As shown in FIG. 3(b), the space between the outer cylinder portion 117 and the boundary wall portion 118 forms an annular flow passage 120 that can be filled with raw water.

[0042] The inner cylinder portion 119 hangs down from the lower surface of the cap portion 104 with a predetermined protruding dimension inside the boundary wall portion 118 at a fixed distance from the inner surface of the boundary wall portion 118 . An internal space 119h surrounded by the inner peripheral surface of the inner cylindrical portion 119 serves as a conduit through which the primary filtered water passes.

[0043] 3(a) and (b), the water passage pipe 105 is formed integrally with the cap portion 104 with its axis aligned with the diameter of the cap portion 104, so that an upper side 105a of the peripheral wall of the pipe protrudes toward the upper surface 104a of the cap portion 104 and a lower side 105b of the peripheral wall protrudes toward the lower surface 104b of the cap portion 104. Both ends 105e, 105e of the water passage pipe 105 protrude radially from the upper surface 104a of the cap portion 104 over almost the entirety.

[0044] As shown in Fig. 2, a raw water inlet 111 and a primary filtered water outlet 112 are formed in both ends 105e, 105e of the water passage pipe 105 protruding from the cap portion 104. Although omitted in Fig. 2, as shown in Figs. 3(a) and (b), a connecting portion 107 having a male thread portion on the outer circumferential surface and a through hole formed in the axial direction is provided at the further tip of the end 105e of the water passage pipe 105, so that it can be connected to each of the raw water side L-shaped pipe 14 and the purified water side L-shaped pipe 21 shown in Fig. 1.

[0045] As shown in Figure 2, the water passage pipe section 105 is configured to extend horizontally from an inlet 111 at one end along the axis of a solid rod member (a roughly cylindrical member in this embodiment) and then have an upstream pipe line 113 that communicates with the annular flow path 120 shown in Figures 2 and 3(b), and a downstream pipe line 114 that extends horizontally from an outlet 112 at the other end and then extends downward to communicate with the internal space 119h of the inner tube section 119.

[0046] The upstream pipe 113 is cut out just before the rear boundary wall 118 within the cap portion 104, where the lower peripheral wall portion 105b of the water pipe portion 105 extends slightly from the lower surface 104b or the inner surface of the outer tube portion 117 as shown in Figure 3(b), so that the peripheral wall portion 105b opens downwardly and communicates with the annular flow path 120.

[0047] The downstream pipe 114 extends horizontally along the axis from the outlet 112, penetrates the boundary wall portion 118 and the inner cylinder portion 119, bends downward above the internal space 119h of the inner cylinder portion 119, and communicates with the internal space 119h of the inner cylinder portion 119. The first bracket portion 102 is substantially entirely made of a resin material.

[0048] Second bracket portion 103 has the same configuration as first bracket portion 102. The second bracket is adapted to detachably attach the upper end opening of chemical substance removal unit 301 to outer cylinder portion 117 by screwing, so as to be closed.

[0049] The first bracket portion 102 and the second bracket portion 103 are connected via a connecting pipe 110 or the like, and a downstream pipe line (communicating passage) 114 of the first bracket portion 102 and an upstream pipe line (communicating passage) 113 of the second bracket portion 103 are connected to each other.

[0050] With the above configuration, the head unit 101 passes raw water through the upstream pipeline 113 of the first bracket part 102 and takes it in to the foreign matter filtering unit 201, discharges primary purified water from the downstream pipeline 114, and then passes the primary purified water through the upstream pipeline 113 of the second bracket part 103 to take it into the chemical substance removal unit 301, and discharges secondary purified water from the downstream pipeline 114.

[0051] The first bracket portion 102 and the second bracket portion 103 are not limited to those having the spherical cap portion 104 exemplified in this embodiment. The first bracket portion 102 and the second bracket portion 103 may have a cap portion 104 formed in a rectangular plate shape in a plan view, a water pipe portion 105 integrally formed in the cap portion 104, and an outer cylinder portion, a boundary wall portion, and an inner cylinder portion, which are circular in a bottom view, as described above, on the lower surface of the cap portion 104. In this case, the water pipe portion 105 has an inlet 111 and an upstream pipe 113, and the upstream pipe 113 may communicate with the annular flow path 120 between the outer cylinder portion 117 and the boundary wall portion 118. The internal space 119h of the inner cylinder portion 119 may communicate with the downstream flow path 114 and the outlet 112 of the water pipe portion 105.

[0052] In other words, the head unit 101 of the present invention has an outer tube portion 117, a boundary wall portion 118 and an inner tube portion 119 protruding from the underside of a plate-like or flat plate-like cap portion 104 having a spherical surface, a water passage portion integrally formed in the cap portion, and has a first bracket portion 102 and a second bracket portion 103 which form the upstream pipeline 113 of the above-mentioned configuration and an annular flow path 120 communicating with it, as well as an internal space 119h of the inner tube portion 119 and a downstream flow path 114 communicating with it.

[0053] In addition, in the above embodiment, the first bracket portion 102 and the second bracket portion 103 are connected via the connecting pipe 110, but the first bracket portion 102 and the second bracket portion 103 may be configured such that the outlet 112 and the inlet 113 of both are directly connected without providing the connecting pipe 110. Also, the first bracket portion 102 and the second bracket portion 103 may be connected to each other by a configuration other than the connection portion 107, and may be connected to components such as the L-shaped pipes 14, 21.

[0054] (Foreign matter filtration unit) As shown in FIG. 2, the foreign matter filtering unit 201 includes a foreign matter removing filter 211, a first housing 212, and a first bottom support portion 214 as main component parts.

[0055] The foreign matter removal filter 211 has a hollow cylindrical shape as a whole, is long in the axial direction, and has a filtering performance capable of removing foreign matter contained in the raw water. The foreign matter removal filter 211 filters the raw water by passing the raw water inward from the outside to the inside in the radial direction, thereby effectively removing foreign matter from the raw water.

[0056] The first housing 212 is cylindrical with a bottom, the inside of which is larger in diameter than the foreign matter removal filter 211 and slightly longer in the axial direction, and has an internal volume capable of accommodating the foreign matter removal filter 211. The foreign matter removal filter 211 is disposed inside the first housing 212 concentrically with the first housing 212 at a substantially constant interval in the radial direction. With the foreign matter removal filter 211 accommodated inside the first housing 212, the inside of the first housing 212 is separated by the foreign matter removal filter 211 and the first bracket portion 102 into a raw water filling portion C11 and a primary filtrate water filling portion C12.

[0057] The raw water filling section C11 is a space that is filled with raw water before foreign matter removal by the foreign matter removal filter 211 during processing by the water purification system S1, and the primary filtrate filling section C12 is a space that is filled with primary filtrate after foreign matter removal by the foreign matter removal filter 211 during processing by the water purification system S1.

[0058] In this embodiment, the raw water filling section C11 is formed as the space outside the foreign matter removal filter 211 within the space inside the first housing 212, and the primary filtrate water filling section C12 is formed as the space inside the foreign matter removal filter 211.

[0059] The first housing 212 is attached to the first bracket part 102 and is detachable from the first bracket part 102. By removing the first housing 212 from the first bracket part 102, the foreign matter removal filter 211 housed therein can be replaced.

[0060] The first bottom support part 214 is attached to the lower end part 2112 of the foreign matter removal filter 211, and supports the foreign matter removal filter 211 while blocking the inner space of the foreign matter removal filter 211 from below. In other words, the inner space of the foreign matter removal filter 211 is shielded from the space outside the foreign matter removal filter 211 by the boundary wall part 118 at the top and by the first bottom support part 214 at the bottom.

[0061] When the first housing accommodating the foreign matter removal filter 211 having the above-described configuration is attached to the first bracket portion 102 by screwing, the tip of the boundary wall portion 118 abuts against the upper end surface of the foreign matter removal filter 211, dividing the raw water filling portion C11 and the primary filtrate water filling portion C12. Therefore, water in the raw water filling portion C11 can enter the primary filtrate water filling portion C12 via the foreign matter removal filter 211. Also, the inner tube portion 119 is inserted into the inside of the tube of the foreign matter removal filter 211, connecting the primary filtrate water filling portion C12 to the downstream pipe 114 of the first bracket portion 102, and the primary filtrate water can be taken out of the first housing.

[0062] Although not adopted in this embodiment, a gasket (hereinafter referred to as the "first gasket" to distinguish it from the second gasket 313 described later) that seals the gap between the first bracket portion 102 and the foreign matter removal filter 211 may be interposed between the boundary wall portion 118 of the first bracket portion 102 and the upper end portion 2111 of the foreign matter removal filter 211 facing it.

[0063] (Chemical Substance Removal Unit) The chemical substance removal unit 301 includes, as main component parts, a chemical substance removal filter 311, a second housing 312, a second packing 313, and a second bottom support portion 316.

[0064] The chemical substance removal filter 311 is a hollow cylinder having a predetermined thickness as a whole, is long in the axial direction, and is formed of a filter material capable of removing chemical substances contained in the raw water. In this embodiment, the chemical substance removal filter 311 effectively removes chemical substances in the primary filtrate by passing the primary filtrate after removing foreign matter inwardly, from the outside to the inside, in the radial direction.

[0065] An example of a filter that can be used as the chemical substance removal filter 311 is an activated carbon filter. In the case of an activated carbon filter, the chemical substance removal filter 311 adsorbs the target chemical substances and decomposes and removes them by the chemical action of carbon. For example, the chemical substance removal filter 311 removes hypochlorous acid in the primary filtrate by decomposing it into hydrogen ions and chloride ions using activated carbon.

[0066] The chemical substance removal filter 311 is not limited to an activated carbon filter, and a soft water filter or the like may also be used.

[0067] Second housing 312 is cylindrical with a bottom, with an interior having a larger diameter than chemical substance removal filter 311 and being slightly longer in the axial direction, and has an interior volume capable of accommodating chemical substance removal filter 311. Chemical substance removal filter 311 is disposed concentrically within second housing 312 at an approximately constant interval in the radial direction relative to second housing 312. With the chemical substance removal filter 311 housed inside the second housing 312, the chemical substance removal filter 311 and the second bracket portion 103 separate the inside of the second housing 312 into an untreated water filled portion C21 and a purified water filled portion C22.

[0068] The untreated water filling section C21 is a space filled with untreated water before chemical substances are removed by the chemical substance removal filter 311, that is, primary filtered water that has been treated in the foreign matter filtering unit 201. The purified water filling section C22 is a space filled with purified water after chemical substances have been removed by the chemical substance removal filter 311 during treatment by the water purification system S1. In this embodiment, the untreated water filling section C21 is formed as the space outside the chemical substance removal filter 311 within the space inside the second housing 312, and the purified water filling section C22 is formed as the space inside the chemical substance removal filter 311.

[0069] Similar to the first housing 212, the second housing 312 is attached to the second bracket part 103 by screwing, and is detachable from the second bracket part 103. By removing the second housing 312 from the second bracket part 103, the chemical substance removal filter 311 and the second gasket 313, which will be described next, housed therein can be replaced.

[0070] In this embodiment, the second housing 312 and the first housing 212 can be attached and removed separately, so that the chemical substance removal filter 311 and the second gasket 313 can be replaced separately from the replacement of the foreign matter removal filter 211.

[0071] FIG. 4 is an enlarged vertical half cross-sectional view of an upper end portion of a chemical substance removal filter 311 used in the water purification system S1 according to this embodiment, and FIG. 4 is a top view of the chemical substance removal filter 311.

[0072] As shown in FIGS. 4( a ) and 4 ( b ), the chemical substance removal filter 311 has a filter body 321 and an upper end cover portion 322 . The upper end cover portion 322 has a disk-shaped top wall portion 322a covering the upper end surface 321a of the filter main body portion 321, a peripheral wall 322b hanging down along the outer edge of the top wall portion 322a and covering the outer circumferential surface 321b that is continuous with the upper end surface 321a, and a convex portion 322c for fitting the second gasket 313 inwardly.

[0073] A circular hole 322h having approximately the same diameter as the inner diameter of the filter body 321 is formed in the center of the disk shape of the top wall 322a. The protruding stripe portion 322c is a circular protruding stripe having an inner diameter that is slightly smaller than the outer diameter of the second packing 313 and protrudes a dimension that is slightly smaller than the thickness of the second packing 313. The protruding stripe portion 322c is preferably circular and formed continuously around the circumference, but may be formed intermittently as long as it can reliably support the second packing 313. As shown in FIG. 2, the chemical substance removal filter 311 has, at its lower end 3112, a lower end cover portion 350 that covers the lower end surface of the filter main body 321 and the peripheral surface in the vicinity thereof.

[0074] The inner cylinder portion 119 is a portion that is inserted into the inner space C22 of the chemical substance removal filter 311 when the chemical substance removal unit 301 is attached to the head unit 101.

[0075] Since the outer diameter of the inner tube portion 119 is smaller than the inner diameters of the filter body portion 321 and the upper end cover portion 322, a gap g extending along the central axis of the chemical substance removal filter 311 is formed between the outer circumferential surface of the inner tube portion 119 and the inner circumferential surface of the chemical substance removal filter 311. This gap g is set to a dimension that can ensure a smooth flow of the primary filtered water that has passed through the water passage 331 of the second packing 313, which will be described later.

[0076] As shown in FIGS. 5(a) and 5(b), the second packing 313 is a rubber plate member formed in a circular ring shape having a predetermined width dimension in the radial direction in a plan view and having a predetermined thickness. The diameter of hole 313h on the inner side of the plate surface of second packing 313 is formed to be approximately the same as inner diameter 322h of upper end cover portion 322 and filter body portion 321 of chemical substance removal filter 311 shown in FIG.

[0077] The predetermined radial width dimension of the second packing is set to such an extent that the second packing can be reliably disposed across the inside and outside of the boundary wall portion 118 of the second bracket portion 103. The second packing 313 may be set to have a radial width dimension equal to or smaller than the radial width dimension of the upper end cover portion 322 shown in Fig. 4, but in this embodiment, the second packing 313 is set to be smaller than the radial width dimension of the upper end cover portion 322, i.e., the outer diameter is set to be smaller.

[0078] The above-mentioned second gasket 313 is sandwiched between the boundary wall portion 118 of the second bracket portion 103 and the upper end cover portion 322 of the chemical substance removal filter 311 arranged below, and liquid-tightly seals the space between the boundary wall portion 118 of the second bracket portion 103 and the chemical substance removal filter 311.

[0079] 4 and 5, second packing 313 is provided with water passage 331 formed by cutting or removing a portion of second packing 313. Water passage 331 can also be called a notch or a missing portion of second packing 313. As shown in FIG. 4(b), the water passage 331 extends radially of the second gasket 313, and is sized to radially span the boundary wall portion 118 when the second gasket 313 is positioned concentrically with the inner tube portion 119 of the head unit 101.

[0080] In this embodiment, the water passage 331 is a hole that penetrates the second gasket 313 in its thickness direction, has a predetermined width in the circumferential direction, and is formed to be longer in the radial direction than in the circumferential direction, although this is not necessarily limited to this. Water passage 331 is formed in an intermediate portion of second packing 313 excluding inner peripheral portion 314 and outer peripheral portion 315. Here, inner peripheral portion 314 of second packing 313 refers to an annular portion of second packing 313 having a predetermined dimension in the radial direction from the inner peripheral edge, and outer peripheral portion 315 refers to an annular portion of second packing 313 having a predetermined dimension in the radial direction from the outer peripheral edge.

[0081] The water passage 331 serves as a passage that provides communication between the untreated water filling section C21 and the purified water filling section C22 of the chemical substance removal unit 301 shown in FIG. As a result, as shown in Figure 6, the untreated water that has flowed into the annular flow path 120 (or filled the untreated water filling section C21), i.e., a portion of the primary filtrate, flows directly from the annular flow path 120 to the purified water filling section C22 through the water passage 331 without passing through the chemical substance removal filter 311. The dimensions of the water passage 331, specifically, the circumferential width, radial length and thickness depth, can be set appropriately so as to obtain the flow rate of the primary filtered water necessary to ensure the residual chlorine concentration in the purified water.

[0082] As shown in FIG. 2, the second bottom support portion 316 is attached to the lower end portion 3112 of the chemical substance removal filter 311 together with the lower end cover portion 350 , and supports the chemical substance removal filter 311 . A packing (not shown) (hereinafter referred to as a "bottom packing") is interposed between the upper surface of the second bottom support part 316 and the opposing lower end part 3112 of the chemical substance removal filter 311. The gap between the second bottom support part 314 and the chemical substance removal filter 311 is closed by this bottom packing.

[0083] In other words, the second bottom support portion 316, in addition to supporting the chemical substance removal filter 311 together with the lower end cover portion 350, is also capable of blocking the untreated water filling portion C21 and the purified water filling portion C22 inside and outside the chemical substance removal filter 311 from below in cooperation with the bottom gasket. In this way, the untreated water filling section C21 and the purified water filling section C22 inside and outside the chemical substance removal filter 311 are shielded from each other by the boundary wall section 118 and the second gasket 313 at the top, and by the second bottom support section 314 and the bottom gasket at the bottom.

[0084] (Explanation of how the water purification system works) When using the water purification system S1 shown in Figure 1, first, as shown in Figure 2, the foreign matter filtration unit 201 having the foreign matter removal filter 211 set therein, and the chemical substance removal unit 301 having the chemical substance removal filter 311 and the second gasket 313 set therein are attached to the first bracket portion 102 and the second bracket portion 103, respectively, to prepare the water purification system main body 1.

[0085] As shown in FIG. 4, for the chemical substance removal unit 301, a second gasket 313 having a water passage 331 capable of ensuring a residual chlorine concentration in accordance with the laws, regulations, etc. of the area in which the water purification system S1 is installed is prepared and is installed in advance on the upper end cover portion 322 of the chemical substance removal filter 311.

[0086] 1 or 2, the water purification system main body 1 is assembled as the water purification system S1 by connecting the inlet 111 of the head unit 101 to the raw water side L-shaped pipe 14 and connecting the outlet 112 to the purified water side L-shaped pipe 21. Note that the inlet 111 of the head unit 101 may be connected to the raw water side L-shaped pipe 14 and the outlet 112 to the purified water side L-shaped pipe 21, and then the foreign matter filtering unit 201 and the chemical substance removal unit 301 may be attached to the head unit 101.

[0087] As a result of the above, the raw water filling section C11 of the foreign matter filtering unit 201 communicates with the raw water side L-shaped pipe 14 via the upstream pipeline 113 of the first bracket part 102, making it possible to introduce raw water from a water meter into the raw water filling section C11. Furthermore, the purified water filling section C22 of the chemical substance removal unit 301 communicates with the purified water side L-shaped pipe 21 via the downstream flow path 114 of the second bracket part 103, making it possible to supply purified water from the purified water filling section C22 to a terminal water supply valve such as a faucet.

[0088] 6, in the foreign matter filtering unit 201, raw water passes from the raw water filling section C11 through the foreign matter removal filter 211 and flows into the primary filtrate filling section C12 (see arrow F1). When the raw water passes through the foreign matter removal filter 211, foreign matter is removed from the raw water. The primary filtrate after the foreign matter removal flows from the primary filtrate filling section C12 through the downstream flow path (communicating passage) 114 of the first bracket part 102 and the upstream pipe (communicating passage) 113 of the second bracket part 103 into the untreated water filling section C21 of the chemical substance removal unit 301.

[0089] In the chemical substance removal unit 301, most of the untreated water passes from the untreated water filling section C21 through the chemical substance removal filter 311 and flows into the purified water filling section C22 (see arrow F2). When the untreated water passes through the chemical substance removal filter 311, chemical substances are removed from the untreated water. The purified water after the chemical substance removal flows from the purified water filling section C22 through the downstream flow path 114 of the second bracket section 103, and exits the chemical substance removal unit 301, i.e., the water purification system main body 1, from the outlet 112.

[0090] As described above, most of the untreated water passes through the chemical substance removal filter 311, while the remaining part flows from the annular flow path 120 through the water passage 331 of the second packing 313 into the purified water filling section C22 (see arrow F3).

[0091] As a result, a portion of the untreated water flows into the purified water filling section C22 while retaining a predetermined amount of chlorine without having the chlorine removed by the chemical substance removal filter 311, and joins the purified water that has passed through the chemical substance removal filter 311. As described above, the head unit 101 and the water purification system S1 of the present invention provide purified water having a desired residual chlorine concentration.

[0092] The water passage 331 provided in the second packing 313 is not limited to the one shown in FIG. 5, and may have various shapes.

[0093] 7 is a plan view showing a packing applicable to the water purification system S1 according to this embodiment as the second packing 313. The packings 313 shown in FIGS. 7(a) shows a packing 313 in which the water passage 331 penetrates radially and is formed over the entire radial direction including the intermediate portion. This second packing 313 may be one in which the water passage 331 does not penetrate radially and only one of the inner peripheral portion 314 or the outer peripheral portion 315 remains. Fig. 7(b) shows packing 313 in the case where water passages 331a, 331b are formed at a plurality of positions in the circumferential direction. Of these plurality of water passages 331a, 331b, each is formed while leaving at least one of the inner peripheral portion or the outer peripheral portion of second packing 313 in order to prevent separation of second packing 313. Fig. 7(b) shows an example in which two water passages 331 are formed, but three or more water passages 331 may be formed at intervals in the circumferential direction.

[0094] Furthermore, the water passage 331 may be formed as a groove other than as a through hole. That is, the water passage 331 may have a bottom in the thickness direction of the second packing 313.

[0095] (Explanation of action and effect) Thus, according to this embodiment, since the water passage 331 is formed in the second gasket 313, a portion of the primary filtered water after the removal of foreign matter does not pass through the chemical substance removal filter 311, but flows through the water passage 331 from the annular flow path 120 into the purified water filling section C22, and is mixed with the purified water after the removal of chemical substances.

[0096] Therefore, according to the second packing 313 of the present invention, it is possible to prevent a shortage in the desired residual chlorine concentration.

[0097] Furthermore, by adopting the simple method of forming a water passage portion 331 in the second gasket 313, the present invention has the effect of making it possible to extremely easily adjust the residual chlorine concentration without the need to prepare a separate device for adjusting the residual chlorine concentration or to make major modifications to the water purification system S1 itself.

[0098] Furthermore, the present invention has the effect of making it possible to easily adjust the residual chlorine concentration by simply replacing the second gasket 313 with various types of gaskets 313 that have different total opening areas of the water passages 331 by varying at least one of the width (i.e., opening area) and number of the water passages 331.

[0099] The present invention has an advantageous effect in that the water passage 331 is shaped to be elongated in the radial direction of the second gasket 313 and is positioned so as to straddle the boundary wall portion 118 of the head unit 101 in the radial direction, thereby making it possible to avoid a situation in which, if a radial shift occurs in the position of the second gasket 313 relative to the boundary wall portion 118, the water passage 331 will come off the boundary wall portion 118 and communication between the untreated water filling portion C21 and the purified water filling portion C22 will be blocked or obstructed.

[0100] The second packing 313 of the present invention shown in Figure 5 does not have a configuration in which the water passage 331 is cut out in the radial direction so as to open to the outer or inner peripheral edge of the second packing 313, but is formed in the middle part excluding the inner peripheral part 314 and the outer peripheral part 315, thereby achieving the effect of suppressing a situation in which distortion occurs in the shape of the water passage 331 when the second housing 312 is attached to the head unit 101, causing a fluctuation in the amount of untreated water passing through the water passage 331.

[0101] Furthermore, in this embodiment, the first housing 212 for storing the foreign matter removal filter 211 and the second housing 312 for storing the chemical substance removal filter 311 are individually detachable from the head unit 101, and in the chemical substance removal unit 301, the existing second gasket 313 can be appropriately replaced with a gasket having a water passage portion 331 of the same or different dimensions.

[0102] As a result, by preparing in advance a number of gaskets with different flow path areas of the water passage 331 defined in a direction perpendicular to the radial direction as gaskets applicable to the second gasket 313, and appropriately replacing these multiple gaskets according to the required residual chlorine concentration, it becomes possible to easily adjust the amount of untreated water flowing from the untreated water filling section C21 to the purified water filling section C22 via the water passage section 331, and thereby adjust the residual chlorine concentration.

[0103] (Modified packing) (First Modification) Fig. 8(a) is a plan view showing a first modified example of the second packing 313 according to this embodiment, and Fig. 8(b) is a cross-sectional view taken along the line XX in Fig. 8(a) of the second packing 313 before it is set in the chemical substance removal unit 301. Fig. 8(c) is a cross-sectional view taken along the line XX in Fig. 8(a) of the second packing 313 when the chemical substance removal unit 301 is attached to the head unit 101.

[0104] In the first modification, water passage 331 is tilted relative to a plane or installation direction before being attached to chemical substance removal unit 301. Specifically, in the cross section shown in Figure 8 (b) where the second gasket 313 is cut in the thickness direction, the water passage 331 is formed at an angle opposite to the rotation direction A of the second housing 312 when attached to the head unit 101, from one end 3311 close to the head unit 101 to the other end 3312 close to the chemical substance removal filter 311. FIG. 8(b) shows the inclination of the water passage 331 when not attached, expressed as an angle θ.

[0105] By thus providing an inclination to the water passage 331, after the second housing 312 is attached to the head unit 101, the inclination of the water passage 331 changes due to the action of the rotational force when attaching the second housing 312, as shown in Fig. 8(c). Therefore, the second packing 313 of the first modified example can correct the extension direction of the water passage 331 to a direction perpendicular to the upper end surface of the chemical substance removal filter 311, making it possible to suppress errors that occur in the amount of untreated water flowing from the untreated water filling section C21 to the purified water filling section C22.

[0106] (Second Modification) Fig. 9 is a plan view showing a second modified example of the second packing 313 according to this embodiment. Fig. 9(a) shows the second modified example of the second packing 313, and Fig. 9(b) shows the second packing 313 of the previous example shown in Fig. 5 etc.

[0107] In the second modification, second packing 313 is formed with a pair of projections 3133 that project radially inward on both sides of inner periphery 314 thereof that sandwich water passage 331 in the circumferential direction.

[0108] The protrusions 3133 are provided within 90° on both sides in the circumferential direction from the position where the water passage 331 is formed. The protrusions 3133 are preferably formed at a position of 30° to 60° in the circumferential direction relative to the water passage 331, more preferably at a position of 40° to 50°, and most preferably at a position of approximately 45°.

[0109] The pair of protrusions 3133 configured as described above come into contact with the outer circumferential surface of the inner cylinder 119 inserted into the inner space of the chemical substance removal filter 311 when the chemical substance removal unit 301 including the second packing 313 is attached to the head unit 101. This allows the second packing 313 of the second modified example to secure a gap g between the inner circumferential edge of the second packing 313 closest to the water passage 331 and the inner cylinder 119, as shown in FIG.

[0110] In this way, the second gasket 313 of the second modified example has the effect of maintaining a smooth flow of untreated water into the water passage 331 by restricting the inner peripheral edge of the water passage 331 from approaching the inner tube portion 119 by the protrusion 3133, thereby securing the gap g.

[0111] (Third Modification) FIG. 10 is a plan view showing a third modified example of the second packing 313 according to the present embodiment.

[0112] The second packing 313 of this embodiment has a plurality of cutout portions 3134 at predetermined positions, which are provided so as to be individually removable, for forming the water passage 331. The second packing 313 of the third modified example is capable of forming the water passage 331 by removing one or more of the plurality of cutout portions 3134 from the second packing 313. 10, four cutout portions 3134 are arranged at equal intervals in the circumferential direction, but the number of cutout portions 3134 and the arrangement when multiple cutout portions 3134 are provided are not limited to this. The number of cutout portions 3134 may be one or multiple. The multiple cutout portions 3134 may be arranged at equal intervals or at different intervals.

[0113] In this way, the second gasket 313 of the third modified example can have an appropriate number of cut-out portions 3134 cut out from the second gasket 313 to form the water passage 331. Therefore, by changing the number and the cut-out portions 3134 that are actually cut out with one second gasket 313, it is possible to adjust the amount of untreated water flowing from the untreated water filling section C21 to the purified water filling section C22 and optimize the residual chlorine concentration.

[0114] Although several embodiments of the present invention have been described, these embodiments are merely illustrative and are not intended to limit the scope of the invention. These novel embodiments can be implemented in various other forms, and various omissions, substitutions, or modifications can be made without departing from the spirit of the invention. These embodiments or modifications thereof are included in the scope and spirit of the invention, and are included in the scope of the invention and its equivalents described in the claims. [Explanation of symbols]

[0115] S1…Water purification system 1. Water purification system main body 101...Head unit 118…Boundary wall part 201…Foreign matter filtration unit 211…Foreign matter removal filter 212…First housing section 301…Chemical substance removal unit 311…Chemical substance removal filter 312…Second housing part 313…Second packing 331…Waterway 3133...Protrusion C11…Raw water filling section C12…Primary filtrate water filling section C21: Untreated water filling section C22…Purified water filling section

Claims

1. A chemical substance removal unit is attached to a head unit having an inlet for raw water and an outlet for purified water, and removes chemical substances contained in the raw water, A chemical substance removing filter for removing the chemical substance; a housing having an upper end opening that is closed by the head unit, housing the chemical substance removal filter, and having an interior that is separated by the chemical substance removal filter into an untreated water filling section that is filled with untreated water before removal by the chemical substance removal filter and a purified water filling section that is filled with the purified water after removal by the chemical substance removal filter; a packing that is disposed between a boundary wall portion formed on a lower surface of the head unit and an upper end surface of the chemical substance removal filter facing the boundary wall portion and closes a gap between the boundary wall portion and the upper end surface, The gasket has a water passage that connects the untreated water filling section and the purified water filling section, and causes a portion of the untreated water to flow from the untreated water filling section to the purified water filling section via the water passage.

2. The chemical substance removal filter is cylindrical, The packing has an annular shape and covers an upper end surface of the chemical substance removal filter with a predetermined width in the radial direction, The chemical substance removal unit according to claim 1 , wherein the water passage extends in a radial direction of the packing to connect the untreated water filled section and the purified water filled section.

3. The chemical substance removal unit according to claim 2 , wherein the water passage is a groove or a through hole formed in a thickness direction of the packing.

4. The chemical substance removal unit according to claim 3 , wherein the water passage is formed in a radially extending elongated hole of the packing.

5. The chemical substance removal unit according to claim 1 , wherein the packing is configured to be freely attached to and detached from the chemical substance removal filter.

6. The chemical substance removal unit according to claim 1 , wherein the gasket has a plurality of cutout portions that are individually removable, and the water passage can be formed by removing one or more of the cutout portions.

7. The chemical substance removal unit according to claim 1 , wherein the water passage is a through hole formed in the thickness direction of the gasket and is formed inclined in the opposite direction to the rotation direction of the housing when attached to the head unit.

8. The chemical substance removal unit according to claim 1 , wherein the packing has protrusions that protrude radially inward on both sides of its inner periphery that circumferentially sandwich the water passage.

9. A packing for use in a chemical substance removal unit according to any one of claims 1 to 8.

10. A head unit having a raw water inlet and a purified water outlet; A foreign matter filtering unit for removing foreign matter contained in the raw water; A water purification system comprising the chemical substance removal unit according to any one of claims 1 to 8, the foreign matter filtering unit includes a foreign matter removing filter for removing the foreign matter, The housing includes: a filter for removing foreign matter and a filter for removing chemical substances; The foreign matter removal filter and the chemical substance removal filter separate the interior of the apparatus into a raw water filling section filled with the raw water before removal by the foreign matter removal filter, a primary filtrate water filling section which is the untreated water filling section or is in communication with the untreated water filling section and is filled with primary filtrate water after removal by the foreign matter removal filter, and the purified water filling section; The raw water filling section is attached to the head unit so as to communicate with the inlet and the purified water filling section is attached to the head unit so as to communicate with the outlet, The gasket allows a portion of the primary filtrate to flow from the untreated water filling section to the purified water filling section without passing through the chemical substance removal filter.

11. the housing includes a first housing and a second housing that are individually attachable to the head unit; the first housing accommodates the foreign matter removal filter, and an inside of the first housing is separated into the raw water filling section and the primary filtrate water filling section by the foreign matter removal filter; the second housing accommodates the chemical substance removal filter, and the chemical substance removal filter separates the inside of the second housing into the untreated water filling section and the purified water filling section; The water purification system according to claim 10 , wherein the head unit further includes a communication passage for communicating the primary filtrate water filling section with the untreated water filling section.

12. A water purification system that removes foreign matter from raw water and removes chemical substances including chlorine from primary filtrate after the foreign matter removal to produce purified water, a head unit having an inlet for the raw water and an outlet for the purified water; a foreign matter removing filter for removing the foreign matter; A chemical substance removing filter for removing the chemical substance; a first housing that is detachably attached to the head unit and that houses the foreign matter removal filter; a second housing that is provided so as to be attachable to the head unit separately from the first housing and that houses the chemical substance removal filter; a packing disposed between a boundary wall portion formed on a lower surface of the head unit and an upper end surface of the chemical substance removal filter facing the boundary wall portion, The first housing includes: The foreign matter removal filter separates the inside of the tank into a raw water filling section filled with the raw water before removal by the foreign matter removal filter and a primary filtrate filling section filled with the primary filtrate after removal by the foreign matter removal filter, The raw water filling section is attached to the head unit in a state where the raw water filling section is in communication with the inlet, The second housing includes: The chemical substance removal filter separates the inside of the tank into an untreated water filling section filled with the untreated water before removal by the chemical substance removal filter and a purified water filling section filled with the purified water after removal by the chemical substance removal filter, The purified water filling section is attached to the head unit in a state where the purified water filling section is in communication with the outlet, The head unit further includes a communication passage that communicates the primary filtrate water filling section and the untreated water filling section, The packing has a water passage that connects the untreated water filling section and the purified water filling section, A water purification system in which a portion of the untreated water is allowed to flow from the untreated water filling section to the purified water filling section without passing through the chemical substance removal filter.

Images