Water purification system

Abstract

To provide a water purification system that offers superior workability during tasks such as filter replacement compared to conventional systems. [Solution] The water purification device comprises a housing, a bubble generator that generates fine bubbles in water, a filter unit housed within the housing, an input unit that supplies untreated water into the housing, and an output unit that outputs water treated by the bubble generator and the filter unit to the outside of the housing. The filter unit is formed in a cylindrical shape and comprises a filter that filters water that permeates from its outer surface, and a discharge pipe that communicates with the center of the filter and discharges the water filtered by the filter to the outside. The axis of the filter is positioned to be inclined with respect to the vertical direction of the installation surface on which the housing is installed.

Description

Technical Field

[0001] The technology disclosed in this specification relates to a water purification device and a water purification system.

Background Art

[0002] Patent Document 1 discloses a so-called central type water purification system that removes foreign substances and chemical substances from tap water, which is raw water, to produce purified water. The water purification system is installed, for example, between the water meter in each household and the boundary between indoors and outdoors. The water purification system includes a head unit having an inlet for raw water and an outlet for purified water, and a foreign substance filtration unit and a chemical substance filtration unit attached to the head unit. Each filtration unit includes a housing and a cylindrical filter housed in the housing. Inside the housing, the filter divides it into an untreated water filling part (the outer part of the filter) filled with water before treatment and a treated water filling part (the inner part of the filter) filled with water after treatment.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] In the water purification system of Patent Document 1, the filters of each filtration unit are arranged so that their axes are perpendicular to the bottom surface of the housing, which is the mounting surface. Consequently, the housings of each filtration unit are also formed in a vertically elongated shape. Centralized water purification systems like the one disclosed in Patent Document 1 are often installed underground near the water meter. Therefore, when the water purification system of Patent Document 1 is installed underground, the housing and the filters within the housing are located at a relatively deep position underground. In that case, it may be difficult to access the filters inside the housing from the surface when replacing filters, making replacement work difficult.

[0005] This specification provides a water purification system that offers improved workability during tasks such as filter replacement compared to conventional systems. [Means for solving the problem]

[0006] The water purification apparatus disclosed herein comprises a housing, a bubble generator for generating fine bubbles in water, a filter unit housed within the housing, an input unit for supplying untreated water into the housing, and an output unit for outputting water treated by the bubble generator and the filter unit to the outside of the housing. The filter unit is formed in a cylindrical shape and comprises a filter for filtering water that permeates from its outer surface, and a discharge pipe section communicating with the center of the filter for discharging the filtered water to the outside. The axis of the filter is positioned to be inclined with respect to the vertical direction of the installation surface on which the housing is installed.

[0007] In the water purification system described above, the filter shaft is positioned so as to be inclined with respect to the vertical direction of the installation surface on which the housing is installed. Therefore, for example, when the housing is installed underground, compared to conventional configurations in which the filter shaft is positioned perpendicular to the installation surface (e.g., the ground in a recessed area from the surface), it is easier to access the filter unit inside the housing from the ground surface when replacing the filter unit, and replacement of the filter unit can be performed more easily than before. Accordingly, the water purification system disclosed herein offers superior workability for tasks such as filter unit replacement compared to conventional systems.

[0008] The housing may have a first portion having an opening on the side, and a second portion that is combinatorial with the first portion and closes the opening when combined with the first portion.

[0009] This configuration provides a housing that can adequately withstand the supply of high-pressure treated water. It allows for water purification while applying sufficient water pressure.

[0010] The second part and a part of the filter unit may be connected, and the second part and the filter unit may be detachable from the first part simultaneously.

[0011] With this configuration, when attaching or detaching the second part to the first part, the filter unit can be attached or detached from the first part at the same time. Therefore, by holding the second part and performing the attachment / detachment operation to the first part, the worker can attach or detach the filter unit to the first part without, for example, touching the filter part of the filter unit. This reduces contamination of the worker's hands and the filter during the attachment / detachment of the filter unit. The attachment / detachment of the filter unit can be performed in a clean environment.

[0012] The first part and the second part may be combined by screwing together a male threaded portion formed on one of the first part and the second part and a female threaded portion formed on the other of the first part and the second part.

[0013] This configuration allows the first and second parts to be joined by directly screwing them together, thus providing sufficient resistance to the supply of high-pressure treated water. Furthermore, the second part can be attached to and detached from the first part without the need for additional fasteners such as bolts and nuts. This provides a housing with a simple structure that can maintain sufficient pressure resistance.

[0014] An opening is formed on the upper surface of the housing, and the housing may further include a door that can open and close the opening.

[0015] With this configuration, for example, if the housing is installed underground, the door can be opened and closed from the ground surface. The filter unit inside the housing can be easily accessed from the ground surface. This configuration further improves the ease of work, such as replacing the filter unit.

[0016] The door may include a door body that is rotatably mounted to the housing and opens and closes the opening as it rotates, and a fastener that is operable from above the housing and fixes the door body when it is in the closed position.

[0017] With this configuration, to open the door, the locking mechanism is released, and the door itself is rotated from the closed position to the open position, thereby opening the opening. The door can be easily opened and closed from the ground. This configuration also offers improved workability for tasks such as filter unit replacement.

[0018] The housing may be formed in a cylindrical shape.

[0019] This configuration allows for the supply of high-pressure water to be treated into the housing. The water can be purified while applying sufficient water pressure.

[0020] The axis of the filter may be positioned so as to be inclined at an angle of 70° to 110° with respect to the vertical direction.

[0021] According to this configuration, a housing for housing the filter unit can be formed relatively shallow. Therefore, when the housing is installed underground, compared with the conventional configuration in which the axis of the filter is arranged perpendicular to the surface (lower surface) on which the housing is installed, it becomes easier to access the filter unit in the housing from the ground surface. According to this configuration, the workability such as filter unit replacement is further improved.

[0022] The axis of the filter may be arranged parallel to the installation surface.

[0023] According to this configuration, a housing for housing the filter unit can be formed even shallower. Therefore, when the housing is installed underground, it becomes even easier to access the filter unit in the housing from the ground surface. According to this configuration, the workability such as filter unit replacement is further improved.

[0024] The bubble generator may be provided in communication with the input portion. Water containing the fine bubbles generated by the bubble generator may be supplied to the filter unit.

[0025] According to this configuration, untreated water supplied from the outside can be first treated by the bubble generator. By generating fine bubbles in the untreated water supplied from the outside, the water can be purified. Then, the water containing fine bubbles after being treated by the bubble generator is supplied to the filter and can be further filtered using the filter. That is, the water can be treated in the order of the bubble generator and the filter unit. Therefore, according to this configuration, treated water that has been more appropriately purified can be supplied from the output portion.

[0026] The water purification system disclosed in this specification includes the above water purification device, a case for housing the water purification device, and a lid. The case can be buried in the ground and is open at the top, and the lid can close the opening of the case while being exposed on the ground surface.

[0027] According to this configuration, the above water purification device can be arranged in the ground near a water meter or the like while being protected by the case and the lid.

Brief Description of the Drawings

[0028] [Figure 1] Perspective view schematically showing the water purification system 2 of the first embodiment. [Figure 2] Cross-sectional explanatory view schematically showing the water purification device 10 in FIG. 1. [Figure 3] Cross-sectional explanatory view showing the state where the second part 16 and the filter unit 40 of the water purification device 10 in FIG. 1 are removed. [Figure 4] Perspective view schematically showing the water purification system 102 of the second embodiment. [Figure 5] Cross-sectional explanatory view schematically showing the water purification device 110 in FIG. 4. [Figure 6] Cross-sectional explanatory view showing the state where the second part 16 and the filter unit 40 of the water purification device 110 in FIG. 4 are removed. [Figure 7] Perspective view schematically showing the water purification system 202 of the third embodiment. [Figure 8] Cross-sectional explanatory view schematically showing the water purification device 210 in FIG. 7. [Figure 9] Cross-sectional explanatory view showing the state where the filter unit 40 of the water purification device 210 in FIG. 7 is removed.

Modes for Carrying Out the Invention

[0029] (First Embodiment) Figure 1 schematically shows the water purification system 2 of the first embodiment. The water purification system 2 of this embodiment is a so-called central water purification system that produces purified water by removing foreign matter and chemical substances from tap water, which is the raw water. As shown in Figure 1, the water purification system 2 comprises a housing box 4 and a water purification device 10 housed within the housing box 4. For ease of understanding, the housing box 4 is shown as a dashed line in Figure 1.

[0030] The housing box 4 is a box for housing the water purification device 10. The housing box 4 has a case 6 and a lid 8. The case 6 is a housing that can be buried underground and has an open top. The bottom of the case 6 may be omitted. The lid 8 is a plate-like member that can close the open part of the case when exposed to the ground surface. The case 6 and lid 8 are made of a highly robust material such as iron. The lid 8 may be rotatably attached to the case 6 via a hinge or the like, or it may be detachably attached to the case 6. The housing box 4 housing the water purification device 10 can be placed underground near a water meter (specifically, underground in the parking space of a residence). In this case, the case 6 is buried underground. The lid 8 is placed exposed above ground so that it can be opened and closed from above ground. This allows the water purification device 10 to be placed underground near a water meter, etc., while protected by the case 6 and lid 8.

[0031] Figure 2 is a cross-sectional explanatory view showing the water purification device 10 of Figure 1. Figure 3 is a cross-sectional explanatory view showing the water purification device 10 of Figure 1 with the second part 16 and the filter unit 40 removed. As shown in Figures 1 to 3, the water purification device 10 includes a main body 11, an input unit 20, a bubble generator 22, an output unit 30, and a filter unit 40.

[0032] The main body 11 constitutes the main body of the water purification device 10. The main body 11 is formed in a cylindrical shape overall. The main body 11 has a housing section 12 and a housing 19. The housing section 12 is the part that houses the bubble generator 22 connected to the input section 20 and the output pipe 32 connected to the output section 30. The housing section 12 may be provided with a notch that allows access to the bubble generator 22 from the outside. An operator can access the bubble generator 22 inside the housing section 12 through the notch and replace the bubble generator 22, etc. In this embodiment, no water to be treated (raw water, purified water) is supplied into the housing section 12.

[0033] As shown in Figure 2, the housing 19 is formed as a cylindrical sealed container. The housing 19 houses the filter unit 40 and also functions as a sealed container for supplying and storing the water to be treated.

[0034] The housing 19 is formed by combining a first part 14 and a second part 16. As shown in Figures 2 and 3, the first part 14 is adjacent to the housing part 12, separated by a partition wall 18. The first part 14 and the housing part 12 are separated by the partition wall 18. The first part 14 is formed in a cylindrical shape with a bottom. The first part 14 has an opening 15 on its side. The opening 15 is formed by opening the end of the cylindrical first part 14 that is opposite to the partition wall 18. A male threaded portion 52 is formed on the outer edge of the opening 15. On the other hand, the second part 16 is also formed in a cylindrical shape with a bottom. The second part 16 has an opening 17 on its side. A female threaded portion 54 is formed on the inner edge of the opening 17.

[0035] The first part 14 and the second part 16 can be combined by facing the opening 15 of the first part 14 and the opening 17 of the second part 16, and screwing the male threaded portion 52 and the female threaded portion 54 together. When the first part 14 and the second part 16 are combined, both openings 15 and 17 are closed. The housing 19 is formed by the first part 14 and the second part 16. In other examples, the female threaded portion may be formed on the first part 14 side and the male threaded portion on the second part 16 side.

[0036] As shown in Figures 1 to 3, the input section 20 is a pipeline for supplying raw water (e.g., tap water) before treatment into the housing 19. The input section 20 is connected to a source of raw water before treatment, such as a water pipe.

[0037] The bubble generator 22 is a device for generating microbubbles in water. The bubble generator 22 has a roughly tubular body. The input end of the bubble generator 22 is connected to the input unit 20, and the output end penetrates the partition wall 18 and is located inside the housing 19. Therefore, the bubble generator 22 can generate microbubbles in the raw water before treatment supplied from the input unit 20 into the housing 19. With the bubble generator 22 installed, raw water containing microbubbles can be supplied into the housing 19. The microbubbles generated by the bubble generator 22 are so-called microbubbles, ultrafine bubbles, nanobubbles, etc. The diameter of the microbubbles is less than 100 μm. Preferably, the diameter of the microbubbles is less than 1 μm.

[0038] The output unit 30 is a pipeline for outputting treated water (water that has been treated by the bubble generator 22 and filter unit 40) to the outside. The output unit 30 is connected to a place where the treated water will be used, such as a faucet in a home.

[0039] The output pipe 32 is a conduit for connecting the filter unit 40 and the output section 30. As shown in Figures 2 and 3, the output pipe 32 is housed within the housing section 12. One end of the output pipe 32 penetrates the partition wall 18 and is positioned inside the housing 19. Within the housing 19, one end of the output pipe 32 is in communication with the discharge pipe section 44 (described later) of the filter unit 40. The other end of the output pipe 32 is connected to the output section 30. Therefore, the output pipe 32 can supply treated water discharged from the discharge pipe section 44 of the filter unit 40 to the output section 30.

[0040] The filter unit 40 is a unit for removing foreign matter and chemical substances from water to be treated by allowing it to permeate. The filter unit 40 has a filter 42 and a discharge pipe section 44. The filter 42 is formed in a cylindrical shape and is a permeation purification means that can filter water that permeates from its outer surface. A known filter such as an RO filter may be used for the filter 42. When raw water is permeated through the filter 42, foreign matter and chemical substances contained in the raw water are removed. The discharge pipe section 44 is in communication with the center of the filter 42 and is a pipeline for discharging the water that has been filtered by the filter 42 to the outside. The discharge pipe section 44 is in communication with the end of the output pipe 32 located inside the housing 19. Therefore, the water that has been filtered by the filter 42 (treated water) is supplied to the output section 30 through the discharge pipe section 44 and the output pipe 32. A male thread may be formed on one of the ends of the discharge pipe section 44 and the output pipe 32 of the filter unit 40, and a female thread may be formed on the other. In that case, the discharge pipe section 44 of the filter unit 40 and the end of the output pipe 32 can be connected by screwing them together.

[0041] The axis 48 of the filter 42 is inclined with respect to the vertical direction 82 that extends perpendicularly from the installation surface 80 on which the main body 11 (housing 19) is installed. That is, the axis 48 of the filter 42 is not parallel to the vertical direction 82. The filter 42 is not installed vertically. The "installation surface 80" referred to here is, for example, the bottom surface of the case 6, the surface of a recess in the ground on which the case 6 is placed, etc. As shown in Figures 1 and 2, in this embodiment, the axis 48 of the filter 42 is perpendicular to the vertical direction 82. That is, the axis 48 is inclined 90° with respect to the vertical direction 82. Therefore, in this embodiment, the axis 48 of the filter 42 is positioned parallel to the installation surface 80. The filter 42 is positioned horizontally. In other examples, the axis 48 may be positioned to be inclined in the range of 70° to 110° with respect to the vertical direction 82.

[0042] As shown in Figures 2 and 3, in this embodiment, a portion of the filter 42 is connected to the inner surface of the bottom of the second portion 16. A connecting portion 46 is provided between the filter 42 and the second portion 16 to connect them. Therefore, in this embodiment, the second portion 16 and the filter unit 40 can be attached to and detached from the first portion 14 simultaneously. Therefore, as shown in Figure 3, the second portion 16 and the filter unit 40 can be removed from the first portion 14 simultaneously.

[0043] Referring to Figure 2, the water flow when raw water (tap water) is treated and output as treated water using the water purification device 10 and water purification system 2 of this embodiment will be explained. The arrows in Figure 2 indicate the water flow. Raw water is supplied from the input unit 20 to the housing 19 via the bubble generator 22. At this time, the bubble generator 22 adds fine bubbles to the raw water supplied to the housing 19. Therefore, raw water containing fine bubbles is supplied to the housing 19. By generating fine bubbles in the raw water, the water can be purified. The raw water in the housing 19 then permeates from the outer surface of the filter 42 into the inside of the filter 42. The raw water is filtered by the filter 42, and foreign matter and chemical substances are removed. Treated water is produced by filtration. The treated water also contains fine bubbles. The treated water, after being filtered by the filter 42, is supplied to the output unit 30 through the discharge pipe 44 and the output pipe 32.

[0044] The configuration of the water purification device 10 and water purification system 2 of this embodiment has been described above. As described above, in the water purification device 10 of this embodiment, the shaft 48 of the filter 42 is positioned to be inclined with respect to the vertical direction 82 of the installation surface 80 on which the housing 19 is installed. More specifically, the shaft 48 of the filter 42 is positioned parallel to the installation surface 80. Therefore, for example, when the housing 19 is installed underground, the housing 19 can be made shallower compared to a conventional configuration in which the filter shaft is positioned perpendicular to the installation surface (for example, the ground in a recessed area from the ground surface). When replacing the filter unit 40, it is easier to access the filter unit 40 inside the housing 19 from the ground surface, and replacement work of the filter unit 40 can be performed more easily than in the conventional configuration. Accordingly, the water purification device 10 of this embodiment is superior in terms of workability, such as replacement of the filter unit 40, compared to the conventional configuration.

[0045] Furthermore, in this embodiment, the housing 19 includes a first portion 14 having an opening 15 on its side, and a second portion 16 that can be combined with the first portion 14, and which closes the opening 15 when combined with the first portion 14. The housing 19 is formed by the combination of the first portion 14 and the second portion 16. A housing 19 that can sufficiently withstand the supply of high-pressure water to be treated can be provided. According to the water purification device 10 of this embodiment, water can be properly purified while applying sufficient water pressure.

[0046] Furthermore, in this embodiment, the second part 16 and a part of the filter 42 are connected, allowing the second part 16 and the filter unit 40 to be attached to and detached from the first part 14 simultaneously. Therefore, with the water purification device 10 of this embodiment, by holding the second part 16 and performing the attachment / detachment operation to the first part 14, the operator can attach and detach the filter unit 40 to the first part 14 without touching, for example, the filter 42 part of the filter unit 40. This prevents the operator's hands and the filter 42 from becoming contaminated during the attachment / detachment of the filter unit 40. The attachment / detachment of the filter unit 40 can be performed in a clean environment.

[0047] Furthermore, in this embodiment, the first part 14 and the second part 16 are joined by screwing together the male threaded portion 52 formed on the first part 14 and the female threaded portion 54 formed on the second part 16. Therefore, the first part 14 and the second part 16 can be firmly joined together. It can withstand the supply of high-pressure treated water. In addition, the second part 16 can be attached to and detached from the first part 14 without using separate connecting devices such as bolts and nuts. A housing 19 that can maintain sufficient pressure resistance can be provided with a simple configuration.

[0048] Furthermore, the housing 19 in this embodiment is formed in a cylindrical shape. Therefore, compared to cases where other shapes are used, high-pressure water to be treated can be supplied into the housing 19. Water can be purified while applying sufficient water pressure.

[0049] Furthermore, in this embodiment, the bubble generator 22 is provided in communication with the input unit 20. Raw water containing fine bubbles generated by the bubble generator 22 is supplied to the filter unit 40. According to the water purification device 10 of this embodiment, untreated water (raw water) supplied from an external source can first be treated by the bubble generator 22. By generating fine bubbles in the raw water supplied from an external source, the water can be purified. Then, the water containing the fine bubbles after treatment by the bubble generator 22 is supplied to the filter 42, and can be further filtered using the filter 42. That is, the water can be treated in the order of bubble generator 22 and then filter unit 40. Therefore, with this configuration, more appropriately purified treated water can be supplied from the output unit 30.

[0050] Furthermore, in the water purification system 2 of this embodiment, the water purification device 10 is housed in a housing box 4. Therefore, the water purification device 10 can be placed underground near a water meter or the like while protected by the case 6 and lid 8.

[0051] (Second example) Referring to Figures 4 to 6, the water purification system 102 of the second embodiment will be described, focusing on the differences from the first embodiment. In Figures 4 to 6, elements common to the first embodiment (see Figures 1 to 3) are indicated by the same reference numerals as in Figures 1 to 3, and detailed explanations are omitted. Figure 4 schematically shows the water purification system 102 of the second embodiment. Figure 5 is a cross-sectional explanatory view showing the water purification device 110 of Figure 4. Figure 6 is a cross-sectional explanatory view showing the water purification device 110 of Figure 4 with the second part 16 and the filter unit 40 removed.

[0052] As shown in Figures 4 to 6, the configuration of the main body 111 of the water purification device 110 in the water purification system 102 of this embodiment differs from that of the first embodiment. In this embodiment as well, the housing 19 is formed by combining a first part 14 and a second part 16. However, in this embodiment, the first part 14 and the second part 16 do not have male and female threaded portions. In this embodiment, the first part 14 and the second part 16 are joined together by a plurality of fasteners 150. A portion of the fastener 150 may be provided on the first part 14 side, and another portion of the fastener 150 may be provided on the second part 16 side. The fasteners 150 are metal fittings that can be operated manually without the need for tools such as screwdrivers or wrenches. The fasteners 150 are provided at multiple locations on the first part 14 and the second part 16. As shown in Figures 4 and 5, the first part 14 and the second part 16 are joined together by fastening the fastener 150 with the opening 15 of the first part 14 and the opening 17 of the second part 16 overlapping. As shown in Figure 6, by removing the fastener 150, the second part 16 and the filter unit 40 can be removed from the first part 14 simultaneously.

[0053] According to the water purification device 110 of this embodiment, the second part 16 can be attached and detached without the use of tools. This makes it easier to replace the filter unit 40, etc.

[0054] (Third embodiment) Referring to Figures 7 to 9, the water purification system 202 of the third embodiment will be described, focusing on the differences from the first and second embodiments. In Figures 7 to 9, elements common to the first embodiment (see Figures 1 to 3) are indicated by the same reference numerals as in Figures 1 to 3, and detailed explanations are omitted. Figure 7 schematically shows the water purification system 202 of the third embodiment. Figure 8 is a cross-sectional explanatory view showing the water purification device 210 of Figure 7. Figure 9 is a cross-sectional explanatory view showing the water purification device 210 of Figure 7 with the door 220 opened and the filter unit 40 removed.

[0055] As shown in Figures 7 to 9, the configuration of the main body 211 of the water purification device 210 in the water purification system 202 of this embodiment differs from that of the first and second embodiments. In this embodiment as well, the main body 211 has a housing section 212 and a housing 214. The housing section 212 and the housing 214 are separated by a partition wall 218. The housing section 212 and the partition wall 218 are the same as the housing section 12 and partition wall 18 of the first embodiment (see Figures 1 to 3). The housing section 212 houses the bubble generator 22 and the output pipe 32. In this embodiment as well, the water to be treated (raw water, purified water) is not supplied to the housing section 212.

[0056] As shown in Figures 7 to 9, the housing 214 is formed in a cylindrical shape. In this embodiment, the housing 214 is formed from a single cylindrical member. An opening 216 is formed on the upper surface of the housing 214. In this embodiment, the main body 211 further includes a door 220 that can open and close the opening 216. The door 220 comprises a door body 230 and a plurality of fasteners 250. The door body 230 is rotatably attached to the housing 214 and is a member that opens and closes the opening 216 as it rotates. When the door body 230 is in the closed position, the opening 216 is sealed by the door body 230.

[0057] Multiple fasteners 250 are fixtures for fixing the door body 230 when it is in the closed position. Part of the fastener 250 may be provided on the door body 230 side, and the other part may be provided on the housing 214 side. The fasteners 250 are metal fittings that can be operated manually without the need for tools such as screwdrivers or wrenches. The fasteners 250 are provided at multiple locations on the door body 230. The fasteners 250 are provided in a position that allows them to be operated from above the housing 214. As shown in Figure 7, when the door body 230 is in the closed position (i.e., with the door body 230 closing the opening 216), the opening 216 is sealed by fastening the fasteners 250. As shown in Figures 8 and 9, the door body 230 can be moved to the open position by removing the fasteners 250. As shown in Figure 9, when the door body 230 is in the open position, an operator can access the filter unit 40 inside the housing 214 from above (for example, from the ground) through the opening 216.

[0058] In the water purification device 210 of this embodiment, an opening 216 is formed on the upper surface of the housing 214, and a door 220 is provided that can open and close the opening 216. Therefore, when the water purification device 210 is installed underground, for example, the door 220 can be opened and closed from the ground surface. The filter unit 40 inside the housing 214 can be easily accessed from the ground surface. This configuration further improves the workability, such as replacing the filter unit 40.

[0059] Furthermore, in this embodiment, the door 220 includes a door body 230 that opens and closes the opening 216 as it rotates, and a fastener 250 that can be operated from above the housing 214 and fixes the door body 230 when it is in the closed position. Therefore, in the water purification device 210 of this embodiment, when opening the door 220, the fastener 250 in the closed position is released, and the door body 230 is rotated from the closed position to the open position, thereby opening the opening 216. There is no need to use tools to open or close the door 220. Therefore, the door 220 can be easily opened and closed from the ground. This configuration further improves the workability of tasks such as replacing the filter unit 40.

[0060] Although embodiments of the technology disclosed herein have been described in detail above, these are merely illustrative and do not limit the scope of the claims. The technology described in the claims includes various modifications and changes to the specific examples illustrated above. For example, the following modifications may be included.

[0061] (Modification 1) In the first and second embodiments, the second part 16 and a part of the filter 42 are connected, and the second part 16 and the filter unit 40 can be attached to and detached from the first part 14 at the same time (see Figures 3 and 6). However, it is not limited to this, and the second part 16 and the filter 42 do not have to be connected. The attachment and detachment of the second part 16 and the attachment and detachment of the filter unit 40 may be performed separately.

[0062] (Modification 2) In the third embodiment, the door 220 may be fixed by means other than the fastener 250. For example, it may be fixed by bolts and nuts, etc. In this case, the door 220 may be fixed using a tool.

[0063] (Modification 3) In the third embodiment, the opening 216 and the door 220 may be provided on a part other than the upper surface of the housing 214. For example, the opening and the door may be provided on the side of the housing 214.

[0064] (Modification 4) In the first to third embodiments, the axis 48 of the filter 42 is perpendicular to the vertical direction 82 that extends perpendicularly from the installation surface 80 on which the main bodies 11, 111, and 211 are installed. That is, in the first to third embodiments, the axis 48 is inclined at 90° with respect to the vertical direction 82. The axis 48 is arranged parallel to the installation surface 80. However, in modifications, the axis 48 of the filter 42 may be arranged to be inclined at a range of 70° to 110° with respect to the vertical direction 82. In yet another modification, the axis 48 of the filter 42 may be arranged to be inclined at any angle other than those mentioned above with respect to the vertical direction 82.

[0065] (Modification 5) In the first to third embodiments, the bubble generator 22 is provided in communication with the input unit 20. Raw water containing fine bubbles generated by the bubble generator 22 is supplied to the filter unit 40. However, the bubble generator 22 may be provided between the discharge pipe section 44 and the output section 30 of the filter unit 40. In that case, water that has been filtered by the filter unit 40 may be supplied to the bubble generator 22. The bubble generator 22 may be configured to generate fine bubbles in the water that has been filtered by the filter unit 40.

[0066] Furthermore, the technical elements described herein or in the drawings demonstrate technical usefulness individually or in various combinations, and are not limited to the combinations described in the claims at the time of filing. In addition, the technologies illustrated herein or in the drawings achieve multiple objectives simultaneously, and achieving even one of these objectives constitutes technical usefulness in itself. [Explanation of Symbols]

[0067] 2: Water purification system 4: Storage Box 6: Case 8: Lid 10: Water purification system 11: Main unit 12: Storage section 14: Part 1 15: Opening 16:Second part 17: Opening 18: Partition Wall 19: Housing 20: Input section 22: Bubble generator 30: Output section 32: Output tube 40: Filter Unit 42: Filter 44: Discharge pipe section 46: Connection part 48: Axis 52: Male threaded section 54: Female threaded section 80: Installation surface 82:Vertical direction 102: Water purification system 110: Water purification system 111: Main unit 150: Fasteners 202: Water purification system 210: Water purification system 211: Main unit 212: Storage section 214: Housing 216: Opening 218: Partition Wall 220: Door 230: Door body 250: Fasteners

Claims

1. A water purification device, A case for housing the aforementioned water purification device, A water purification system comprising a lid, The aforementioned case can be buried underground and is open at the top. The aforementioned lid, while exposed to the ground surface, can close the opening of the case. The water purification device is Housing and A bubble generator that generates tiny bubbles in water, A filter unit housed within the aforementioned housing, An input unit that supplies water before processing into the housing, The system includes an output unit that outputs water processed by the bubble generator and the filter unit to the outside of the housing, The aforementioned filter unit is It is formed in a cylindrical shape and has a filter that filters water that permeates from the outer surface, It comprises a discharge pipe section that communicates with the central part of the filter and discharges the water filtered by the filter to the outside, A water purification system in which the axis of the filter is positioned to be inclined with respect to the vertical direction of the mounting surface on which the housing is installed.

2. The water purification system according to claim 1, wherein the housing comprises a first portion having an opening on the side, and a second portion that is combinatorial with the first portion and closes the opening when combinatorial with the first portion.

3. The water purification system according to claim 2, wherein the second part and a part of the filter unit are connected, and the second part and the filter unit can be attached to and detached from the first part simultaneously.

4. The water purification system according to claim 2, wherein the first part and the second part are combined by screwing together a male threaded portion formed on one of the first part and the second part and a female threaded portion formed on the other of the first part and the second part.

5. An opening is formed on the upper surface of the housing, The water purification system according to claim 1, further comprising a door that can open and close the aforementioned opening.

6. The aforementioned door is A door body is rotatably mounted to the housing and opens and closes the opening as it rotates, The water purification system according to claim 5, further comprising a fastener that is operable from above the housing and secures the door body when the door body is in the closed position.

7. The water purification system according to claim 1, wherein the housing is formed in a cylindrical shape.

8. The water purification system according to claim 1, wherein the shaft of the filter is arranged to be inclined in the range of 70° to 110° with respect to the vertical direction.

9. The water purification system according to claim 8, wherein the shaft of the filter is arranged parallel to the installation surface.

10. The bubble generator is provided in communication with the input unit, The water purification system according to claim 1, wherein the filter unit is supplied with water containing the fine bubbles generated by the bubble generator.

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