Pool filtration equipment

Abstract

To provide a filtering device which safely absorbs floating garbage on the water surface of a swimming pool, has a high flow rate capable of efficiently collecting it, has excellent filtering efficiency, and is easy to maintain a filter, and is safety-conscious. [Solution] A method and device for filtering the pool water surface, in which untreated water is taken in from a box-shaped water intake section having a water intake opening and water intake outlet that open wide horizontally at the expected water level height of the pool side wall, and the untreated water is forced to flow in a vortex by being introduced from above a vertically long cylindrical filtration unit main body that is positioned downstream of the water intake outlet and has a central axis that is shifted to the left or right from the water intake outlet, and the filtered water on the outer periphery is discharged by a pump from a filtered water outlet located on the outer periphery of the filtration unit main body to an outlet on the pool side wall.

Description

[Technical Field]

[0001] The present invention relates to a cleaning device suitable for trapping and removing floating debris from the water surface while maintaining the aesthetic appearance of the pool water surface. In particular, the present invention relates to a pool filtration device suitable for trapping and removing floating debris from the water surface, which is equipped with a detachable and reusable filter for trapping and removing floating debris. [Background technology]

[0002] Pools require hygienic water quality management, including filtration and sterilization, to ensure the health of users, and much attention is being paid to water quality management equipment and its maintenance and operation. Sanitation standards for swimming pools are set out in the Ministry of Health, Labor and Welfare's Health Notification No. 0528003 of 2007, and for schools, the School Environmental Sanitation Standards (Ministry of Education, Culture, Sports, Science and Technology Notification No. 60 of March 31, 2009). Compliance with sanitary regulations regarding water quality is required. For circulating filtration equipment, water quality regulations also require the turbidity of treated water at the outlet to be 0.1 degrees or less. The need for regular cleaning of pools is also mentioned.

[0003] However, maintaining hygienic water quality in a pool is one of the minimum requirements for safe use. Floating debris on the surface of the pool water significantly diminishes the aesthetic appeal of the pool. In particular, outdoor pools tend to contain not only users' hair but also fallen leaves, flying insects, and other debris that find their way onto the water's surface, so there is a need to efficiently capture and quickly remove floating debris while it is floating on the surface.

[0004] In particular, pools installed in hotels, leisure facilities, and homes, especially outdoor pools, are often left filled with water and used as a visual scenic feature even during the winter, when swimmers are not allowed to swim. If a pool is left unused, like a school outdoor pool in the winter, debris quickly accumulates inside the pool, detracting from its aesthetic appeal. It is desirable to maintain its aesthetic appearance throughout the year, including the off-season.

[0005] Regarding the removal of dust particles floating on the water surface, there is a proposal that fine dust particles suspended in the pool water can be suspended by applying a force to the water with a propeller, which draws the particles into the water due to surface tension. This allows the particles to be sent together with the pool water to a pool water purification device, which is the original treatment device, for collection, thereby eliminating the need for extra work to collect the floating particles and allowing them to be removed (see Patent Document 1).

[0006] However, the removal of dust and particles as described in Patent Document 1 is intended to remove floating dust in places such as nuclear fuel pit pools, as it becomes a radioactive material and needs to be treated if it is exposed to radioactivity for a long period of time. [Prior art documents] [Patent documents]

[0007] [Patent Document 1] Japanese Patent Application Publication No. 11-077036 Summary of the Invention [Problem to be solved by the invention]

[0008] In swimming pools, even if floating dust particles are taken in as they are, they can be removed using filtering devices such as sand filters, and there is no problem with disposing of residual substances such as radioactivity. Rather, in order to enjoy the beauty and scenery of the pool, it is necessary to actively and quickly remove larger floating debris such as hair, fibers, insects, and fallen leaves from the water surface.

[0009] Now, if a large amount of water is taken in from the surface of a pool in order to efficiently capture floating debris, the filter will quickly become clogged with debris, resulting in a decrease in water intake. These filters are individually designed by each pool manufacturer, and are often specialized products made from high-density nonwoven fabrics or other fabrics pleated to ensure a large surface area; in reality, there are no general-purpose filters. Filters need to be replaced periodically, but these filters are disposable and not intended for reuse, meaning replacement is a costly part. The floating debris trapped in these disposable filters is difficult to remove simply by washing them. Furthermore, the fine mesh of wet filters, with their high water retention, makes them difficult to dry. Even if you try to wash them, they will not dry easily, making them unsuitable for reuse.

[0010] However, some people try to clean disposable filters because they are too expensive to be thrown away after one use, but in reality they are difficult to clean and cannot be washed repeatedly, so they end up being thrown away and replaced with new ones sooner. This means that the filter alone can cost hundreds of thousands of yen, making maintenance costs a significant expense that cannot be ignored. As a result, in the case of pools installed in private homes, the required frequency of replacement is not worth it.

[0011] Furthermore, the Ministry of Health, Labor and Welfare's "Swimming Pool Hygiene Standards" stipulate that the filtration capacity of swimming pools must be "at least one-sixth of the total capacity of the pool itself plus the amount of circulating water per hour." Therefore, adding more filtration equipment to meet the required capacity would result in higher installation and operation costs. Therefore, rather than simply adding more filtration equipment, it would be useful to improve the processing capacity of the filtration equipment itself, i.e., to improve efficiency by efficiently collecting water within the filtration equipment using a pump. It would also be useful to increase the filtration speed.

[0012] Filters in filtration equipment create resistance when water passes through them. However, it is unavoidable to have the water pass through filters for filtration purposes. Therefore, in order to increase the speed at which the water passes through, it is possible to increase the pump's lift by using a larger pump. However, increasing the pump's lift will result in an increase in the size of the equipment and in higher costs.

[0013] Furthermore, because the resistance to passage through filters and the like is large, it is necessary not only to increase the pump lift, but also to find ways to ensure that the water introduced into the filtration device can pass through the filtration filter efficiently. Therefore, it is desirable to increase the flow rate within the filtration device.

[0014] Furthermore, even if the capacity of the pump is increased to improve the filtering capacity, the water level in the filter will drop, and if the amount of wastewater in the filter exceeds the amount of water inflow, there is a risk that the pump will run dry, which could result in damage to the pump. Therefore, there is a need for a way to prevent dry running when pumping with a pump with high drainage capacity, for example, a way to maintain the water level in the filter so that the water does not completely drain.

[0015] If water is taken in from the pool to maintain the water level, safety considerations should also be given to the intake. Similarly, if the intake to the filtration device is located on the bottom of the pool, there is a risk of children being accidentally sucked in, so safety measures are also required for the intake.

[0016] Therefore, the present invention aims to provide a filtration device that has a high flow rate, excellent filtering efficiency, and easy filter maintenance, which can safely absorb and efficiently collect floating debris on the surface of the pool water.That is, the present invention aims to provide a filtration device that has excellent filtering efficiency, which can safely absorb and efficiently collect floating debris on the surface of the pool water, and that also takes safety into consideration by preventing the pump from running dry and increasing the flow rate into the filtration device to make it easier for water to pass through the filter.The present invention also aims to provide a filtration device for collecting floating debris on the surface of the pool water, which has a collection section with a filter that is easy to remove collected floating debris during daily maintenance, is easy to replace and remove, and can be recycled by washing and laundering, and has an easy filter maintenance. [Means for solving the problem]

[0017] Therefore, after extensive research, the inventors have found that in a filtration device that filters water taken in from an intake port on the side wall of a pool and discharges it into the pool using a pump, (a) the opening of the intake port is aligned with the level of the water surface to efficiently capture floating debris on the water surface, (b) the cross section of the inside of the intake port is narrowed to increase the flow rate, thereby giving momentum to the untreated water flowing into the inside and increasing the flow rate, (c) the outlet of the intake port is shifted to the right or left from the cylindrical central axis of the filtration device main body, so that the untreated water put into the filtration device main body does not flow into a place other than the center of the filtration device main body, and is encouraged to swirl clockwise or counterclockwise, and the swirling untreated water is forced to flow from the inner periphery to the outer periphery within the filtration device main body, and (d) the untreated water that is forced to flow while swirling passes quickly from the inner periphery to the outer periphery through a flexible, detachable and replaceable plate-shaped permeable filter that is cylindrically housed within a cylindrical frame within the filtration device main body, thereby achieving effective filtration. (e) the water filtered by the pump can be discharged efficiently by discharging it from the outer periphery of the filtration device body along the vortex flow; (f) if the water level inside the filtration device body drops too much due to the pump's discharge, the pump will run dry, so by providing a water conduit that connects the filtration device body and the pool side wall separately from the water intake, the water level on the outer periphery is maintained while the water level on the inner periphery drops, making it easier to maintain the flow rate; (g) although it is possible to provide a water conduit separately in the pool side wall, arranging the water conduit concentrically on the outer periphery of the outlet that discharges filtered water from the pump makes it easier to prevent children from being caught in the water conduit along the wall by the jet of water caused by the force of the discharged water; (h) it is easy to store a flexible, detachable and replaceable water-permeable filter by bending it into a cylindrical shape, making maintenance such as cleaning efficient and making it easy to maintain water flow. It was found that the mechanism of such a filtration device allows for efficient filtration.

[0018] That is, the first means for solving the problems of the present invention is: A box-shaped water intake section having a water intake opening and a water intake outlet that open horizontally wide at the expected water level height of the pool side wall; A vertically elongated cylindrical filtration unit body with its central axis vertically oriented, disposed downstream of the water intake outlet and shifted to either the left or right of the water intake outlet; a pump for discharging the water filtered by a flexible, detachable, and replaceable plate-shaped water-permeable filter housed in a cylindrical frame within the filtration unit body, which filters the water that has flowed into the filtration unit body from the water intake section to a filtered water outlet on the pool side wall, the filtered water being discharged from an outlet on the outer periphery of the filtration unit body; This is a pool filtration device equipped with the above.

[0019] The second means is a pool filtration device described in the first means, characterized in that the box-shaped water intake section is a truncated quadrangular pyramid in which the cross-sectional area of ​​the downstream water intake outlet is smaller than the cross-sectional area of ​​the water intake opening.

[0020] The third means is a pool filtration device according to the first or second means, characterized in that the vertically elongated cylindrical filtration body has a height to diameter ratio of the cylindrical frame body of 2 to 5, making it vertically elongated.

[0021] The fourth means is a pool filtration device described in any one of the first to third means, characterized in that it is provided with a water conduit for preventing dry running from the pool side wall to the water conduit opening in the side wall of the filtration unit main body.

[0022] The fifth means is a pool filtration device according to the fourth means, characterized in that the water conduit has a water conduit opening in the pool side wall that is concentrically arranged around the outer periphery of the pool side wall outlet.

[0023] The sixth means is a pool filtration device according to any one of claims 1 to 5, characterized in that the filtered water outlet opens along the direction of water flow on the lower outer periphery of the filtration unit main body.

[0024] The seventh means is a pool filtration device according to any one of the first to sixth means, characterized in that the flexible plate-shaped water-permeable filter has a three-dimensional mesh structure on both surfaces of a plastic resin, and has at least an activated carbon layer and a chemical fiber cotton layer inside, which are laminated in layers to form an integrated plate-shaped material.

[0025] The eighth means is to take in untreated water near the water surface of the pool from a box-shaped water intake section having a water intake opening and a water intake outlet that open horizontally wide at the expected water level height on the side wall of the pool, The filter unit has a vertically elongated cylindrical shape, and is positioned downstream of the intake outlet with its central axis shifted to either the left or right of the intake outlet. The central axis of the filter unit is oriented vertically. Untreated water is forced to flow into the filter unit from above, creating a vortex-like flow. The swirling untreated water is filtered by passing it from the inner periphery to the outer periphery of a flexible, removable and replaceable plate-shaped permeable filter housed in a cylindrical frame within the filtration unit body. This is a method for filtering the pool water surface, in which filtered water is discharged by a pump from a filtered water outlet provided on the outer periphery of the filter body to an outlet in the pool side wall.

[0026] The ninth means is a method for filtering the pool water surface described in the eighth means, characterized in that the box-shaped water intake section is made into a truncated quadrangular pyramid shape with a smaller cross-sectional area at the downstream outlet than at the water intake opening, thereby increasing the flow rate of untreated water, and forcing it to flow into the vertically cylindrical filtration section body from above, causing it to flow in a vortex pattern.

[0027] The tenth means is a method for filtering the water surface of a pool as described in the eighth or ninth means, characterized in that the level of filtered water discharged by the pump in the filter body is kept from dropping too low by directing water from a water conduit for preventing dry running from the side wall of the pool to a water conduit opening in the side wall of the filter body.

[0028] The eleventh means is a method for filtering the pool water surface according to any one of the eighth to tenth means, characterized in that the water-conducting openings in the pool side walls of the water conduit are arranged concentrically around the outer periphery of the pool side wall outlet, making them side wall openings that combine water-conducting and discharge functions, so that the water-conducting openings direct water from the outer periphery to the filtration unit main body, while filtered water is sprayed out from the pool side wall outlet by a pump. [Effects of the Invention]

[0029] In the filtration device of the present invention, the filtration unit main body has a vertically long, deep cylindrical body, so that when untreated water flows in from the water intake section and flows in a vortex in a clockwise or counterclockwise direction before being discharged from the outer outlet, a water flow velocity can be easily obtained.

[0030] By introducing untreated water into the upper part of the filtration unit body from a downstream outlet of the water intake located above the cylindrical filtration unit body, which is shifted to the left or right of the cylindrical central axis of the filtration unit body, the flowing water is forced by the falling current to swirl in a clockwise or counterclockwise direction, which naturally generates a vortex rotation.This allows the water to pass quickly from the inner to the outer periphery of the permeable filter using a vortex flow in the desired direction, and by allowing the water to pass through the permeable filter without being affected by its resistance to passage, high filtration processing capacity can be ensured.

[0031] If the box-shaped intake section is a truncated pyramid shape with a cross section that gets smaller the further downstream, the flow rate will accelerate at the narrow downstream side, and the untreated water will be forced more forcefully into the upper part of the filtration section, creating a faster vortex flow. This allows the water to pass quickly from the inner periphery to the outer periphery of the permeable filter, which will likely improve the filtration speed.

[0032] The wide, horizontal intake section opens at water surface level, allowing fallen leaves and floating debris to be quickly collected and drawn into the filter body.

[0033] If the outlet provided on the outer periphery of the filter device body is oriented in the direction of the vortex flow, the pump will discharge the fluid smoothly and without resistance, allowing for efficient discharge.

[0034] If the water level inside the filter unit drops too low, the pump will run dry. Therefore, a separate water intake is provided from the filter unit itself and the pool sidewall, allowing water to be drawn from underwater. This system attempts to raise the water level in the filter unit to the pool's water level. This stabilizes the operation of pumps, which are difficult to adjust; increasing the pump's output too much will cause dry running, while reducing the pump's output will reduce efficiency due to vortex rotation. Even with a pump with a higher output, the system can maintain stable operation by maintaining a stable water level at about halfway around the periphery of the filter unit. This allows for stable operation without the need for adjustments such as lowering the pump's output to reduce filtering capacity or running the pump dry, which can damage the pump. Furthermore, even when the water level on the outer periphery is high, the water level at the center of the vortex on the inner periphery is low, preventing the vortex rotation speed from slowing down, making it easier to achieve a stable flow rate.

[0035] If the opening of the water conduit in the pool side wall is arranged concentrically around the outlet that discharges filtered water from the pump, the water discharged from the pump will be ejected with force, making it difficult for children and others to approach the opening. This makes it easier to prevent problems such as fingers being sucked in when the concentrically positioned water conduit outlet sucks in water. Therefore, safety can be easily maintained even if the opening of the water conduit is located below the water surface in the pool side wall.

[0036] A flexible, detachable and replaceable water-permeable filter in the form of a plate is bent into a cylindrical shape and stored to be installed as a cylindrical filter, and after use the filter can be removed and washed in a flat plate shape, making maintenance simple and easy to carry out. [Brief explanation of the drawings]

[0037] [Figure 1] FIG. 1 is a schematic diagram of the filtration device of the present invention, showing the water intake opening into the side wall of the pool, and the filtration unit body and pump arranged on the back side of the side wall of the pool. [Figure 2] FIG. 2 is a schematic plan view illustrating the configuration of the filtration device of the present invention. [Figure 3]FIG. 3 is a diagram illustrating the state before assembly of the frame body and the inner cylindrical bucket for holding and storing the plate-shaped water-permeable filter while bending it into a cylindrical shape. [Figure 4] Figure 4 shows the water permeable filter bent into a cylindrical shape and housed in an outer frame. DETAILED DESCRIPTION OF THE INVENTION

[0038] Hereinafter, an embodiment of the present invention will be described with reference to the drawings as appropriate. As shown in FIG. 1, the filtration device (1) of the present invention takes in untreated water (19) from the water surface through a water intake opening (6) of a water intake unit (2) that opens to the water surface (24) of a swimming pool (21) made of concrete or FRP pool side walls (22) and a pool bottom wall (23), and then discharges the untreated water (19) from a water intake outlet (7) toward an upper space (18) shifted to the left or right from the central axis (12) of a vertically elongated cylindrical filtration unit main body (3) that is buried in the ground behind the pool side walls (22). By pouring the water into a position off the central axis between the two, the energized untreated water (19) is swirled and taken into the filtration unit main body (3), where the taken-in untreated water (19) is filtered by passing from the inner periphery to the outer periphery through a permeable filter (8) housed in a cylindrical frame (9) inside the filtration unit main body, and the filtered water (20) is then ejected from the pool side wall (22) by a pump (4) in the pump chamber through a filtered water outlet (13) on the outer periphery of the filtration unit main body and into the pool (15) through the pool side wall outlet (5). This filtration device efficiently captures floating debris on the surface of the pool and purifies the water.

[0039] Untreated water (19) taken in from the water surface (24) of the pool (21) (1 m deep) flows through the water intake (2) into the downstream filtration unit (3). At this time, the water in the filtration unit (3) is swirling at high speed, and the water level at its center drops due to the combined action of the pump (4) and the drainage. This causes the untreated water to fall into the upper space (18) of the filtration unit, which increases the momentum of the vortex rotation. Therefore, by shifting the direction of the water intake (6) to the left or right of the central axis (12) of the filtration unit (3), the incoming untreated water (19) falls to a position other than the central axis (12), promoting vortex rotation and improving filtration efficiency.

[0040] The interior of the filter unit body (3), located below the pool's water surface (24), is not completely submerged. High-speed vortex rotation and pump drainage create an upper space (18) above the filter unit body (3), allowing water to fall through the water intake outlet. By narrowing the interior of the water intake (2) to create a narrow passage, the water can be allowed to fall at an accelerated flow rate, further improving vortex rotation. The upper space (18) above the filter unit body at the back of the water intake (2) is normally not filled with water, but if the pump (4) stops, the water level inside will rise and fill it. Therefore, a drain hole (29) can be provided at a predetermined water level in the pool to prevent overflow.

[0041] In the following example, a filtration device (1) suitable for application to a rectangular pool (21) with concrete walls measuring 3 m long, 7 m wide, and 1 m deep will be described. The number of filtration devices of the present invention to be installed can be determined appropriately based on the pumping power of the pump and the amount of water circulating through the filtration device per unit time, so as to suit the amount of water in the pool.

[0042] The volume of a 3m x 7m x 1m pool is 21m 3Therefore, if one filter has a processing capacity of 35 liters per minute, one filter will replace one-tenth of the water per hour. Even when used in a swimming pool used by many people, installing this filter in two locations will be sufficient to circulate one-sixth of the water, or 3,500 liters, per hour.

[0043] When the pool (21) is made of concrete, holes are drilled in the pool side walls (22) cast in place at a position including the height of 1 m of the pool side wall (22) if the water surface height is 1 m, either in advance or afterwards, and a water intake opening (6) of the water intake section (2) of the filtration device (1) of the present invention is opened in the pool side wall (22), and the water intake section (2) is a long, box-shaped water intake section (2) equipped with a water intake outlet (7) that extends from the pool side wall (22) to the back. The cross section of the water intake opening (6) is a long, horizontal opening measuring, for example, 300 mm wide x 150 mm long, and is a truncated quadrangular pyramid shape whose cross section becomes smaller toward the water intake outlet (7) side, and the narrowest part on the water intake outlet side is, for example, 120 mm wide x 120 mm long.

[0044] In this way, if the intake section (2) is made into a truncated pyramid shape so that the outlet side is narrower than the inlet, the flow rate at the intake outlet (7) will be about 7cc / cm when the water depth at the outlet side is 70mm at the bottom of the outlet opening. 2 On the other hand, the flow rate at the intake opening (6) is about 2.2 cc / cm 2 As you can see, the flow near the intake opening is slow, but the flow speed increases by more than three times as fast as it goes further in. The fact that the intake opening (6) is located on the water surface makes it safer than sucking water underwater or from the bottom. In addition, the wide, horizontal opening close to the side wall allows for a slow flow, making it less likely to cause an accident than if the flow were fast.

[0045] Making the outlet narrower than the inlet can be achieved by narrowing the width on the left and right sides of the outlet, but the cross section of the outlet can be made smaller by making the depth of the outlet shallower than the inlet. If the depth of the outlet is shallower, the particles will fall from a slightly higher position into the space above the filtration unit body, so they will be more likely to be exerted forcefully.

[0046] The truncated pyramid shape may have both left and right walls that are equally narrow, or one of the left and right vertical walls may be tilted more sharply toward the back, thereby narrowing the cross-sectional area of ​​the water intake outlet 7. By directing the flow by tilting one of the left and right vertical walls, the direction of input of untreated water flowing from downstream of the water intake outlet 7 into the upper space 18 of the filtration unit main body 3 may be controlled.

[0047] The direction of the downstream inflow from the water intake outlet (7) is shifted to either the left or right of the vertical central axis (12) of the elongated filtration unit body (3). For example, if the water flows forcefully and at a high flow rate to the left of the central axis, it will vortex rotate clockwise. If the water flows to the right, it will vortex rotate counterclockwise. If the water flows near the central axis, the flow will be turbulent, making it difficult for the vortex to rotate cleanly, and the rotation efficiency will decrease accordingly.

[0048] Untreated water (19) from the water intake outlet (7) vortexes and enters the area inside the central inner frame of the filtration unit main body (3). The top of the filtration unit main body (3) is opened to the size of the outer diameter of the frame (9), and the rest of the top of the filtration unit main body (3) is closed, so that untreated water (19) is introduced only from the center side.

[0049] Next, the filtration unit main body (3) is a vertically long cylindrical shape with a diameter of, for example, 30 cm and a height of about 80 cm and a bottom. The frame (9) detachably housed within the filtration unit main body (3) is composed of a vertically long cylindrical outer frame (10) and an inner frame (11) as shown in Figure 3, and the flat water-permeable filter (8) can be bent into a cylindrical shape and housed in the internal space formed by the combination of the outer frame (10) and the inner frame (11) as shown in Figure 4. The water-permeable filter is detachably housed so that it can be removed for cleaning and replacement.

[0050] The water-permeable filter (8) is a flat, water-permeable filter with a honeycomb-like three-dimensional mesh structure on both surfaces and a layer of hydrophobic polypropylene fiber, activated carbon, polyester, nylon, or synthetic fiber cotton laminated in the middle. The flat water-permeable filter (8) is bent into a cylindrical shape and fitted from the inside along the outer frame (10) of a cylindrical stainless steel frame (9). The inner frame (10) of the frame (9) is then fitted to support the water-permeable filter (8) from the inside as well.

[0051] The three-dimensional honeycomb mesh structure of the water-permeable filter (8) is made, for example, by warp-knitting nylon yarn. The three-dimensional gaps in the honeycomb ensure that water does not impede the passage of water through the filter, allowing it to capture large floating debris. The hydrophobic fiber layer is made of polypropylene, polytetrafluoroethylene, or the like, and captures finer floating debris. The activated carbon layer and chemical fiber cotton adsorb and remove odors and fine impurities. Examples of chemical fibers include recycled fibers, semi-synthetic fibers, synthetic fibers, and inorganic fibers. Synthetic fibers such as polyester, nylon, and polypropylene are preferred, but composites of fibers from multiple materials may also be used. The laminated boards are approximately 20 to 22 mm thick and 55 cm long and 55 cm wide.

[0052] The cylindrical permeable filter (8) housed within the frame (9) is used to filter water from the inner periphery to the outer periphery. Untreated water (19) flowing into the cylinder, whose central axis (12) is perpendicular to the axis, is naturally urged to swirl and flow clockwise or counterclockwise because the inlet passage from the water intake outlet (7) to the upper space (18) of the filtration unit main body (3) is offset to the left or right from the central axis (12). The centrifugal force of the vortex causes the untreated water (19) to flow toward the outer periphery, allowing it to quickly pass from the inner periphery to the outer periphery of the permeable filter (8). If the permeable filter (8) is integrally formed in layers from multiple materials, space for water to flow around the captured bulky waste is secured, preventing a decrease in water flow efficiency.

[0053] The cylindrical frame (9) is elongated, for example, with an outer diameter of 18 cm and a height of 55 cm. It is preferable for the cylindrical shape to be elongated with a depth at least twice as long as the diameter. A greater depth generally increases the potential vorticity, allowing the vortex to rotate faster, thereby improving the flow rate and allowing the water to pass through the permeable filter (9) more efficiently. From this perspective, the height (depth) is preferably 2 to 5 times the diameter. The inner frame (11), placed inside the outer frame (10) with an outer diameter of 18 cm and a height of 55 cm, has an outer diameter of approximately 14 cm and a height of 55 cm, and the permeable filter is housed between the two frames.

[0054] Additionally, an inner cylindrical bucket (17) made of punched metal or metal mesh may be installed inside the inner frame (11) of the frame structure (9) as a preliminary collection trap. For example, its diameter may be approximately 12 to 13 cm. This makes it easy to remove large leaves and insects that have been pre-trapped in the inner cylindrical bucket (17). Therefore, maintenance work such as removing and installing the permeable filter (8) approximately once a week and cleaning it with a hose can be performed to prevent the filter from clogging.

[0055] The filtered water outlet (13) on the outer periphery of the cylindrical filter body (3) is connected to the pump (4) and is discharged through the drainage channel (14) and the drainage port (5) on the side wall of the pool. To improve the drainage efficiency of the pump (4), it is preferable to install the filtered water outlet (13) at a height of about the middle to lower middle of the filter body (3) rather than on the outer periphery of the bottom of the filter body (3). Because the water in the filter body (3) is vortex-rotating at high speed, it is more efficient to drain water from a slightly deeper position from the outer periphery so as not to reduce the efficiency of the vortex rotation when the pump (4) drains the filtered water outlet (13) by following the vortex rotation.

[0056] When the filtrate outlet was located near the bottom of the cylindrical filtration unit body (3), the speed of the vortex rotation was slower than when the filtrate outlet (13) was located at the height of the middle or lower stage, for example, 20 cm from the bottom.

[0057] As the pump (4) draws water filtered through the permeable filter (8) and the water rotates rapidly, the water level in the center of the cylindrical, vertically elongated filter unit (3) drops. As the pump (4) pumps out water swirling at high speed, the water level at the center of the vortex drops compared to the periphery. As the water flows from the intake (2) downstream into the filter unit (3), a drop occurs, forcing the water to fall. Taking into account the force of the inflow, the water swirls rapidly, forcing the water toward the periphery by centrifugal force and passing through the permeable filter (8) with great force. The lowered water level in the center helps maintain a high vortex rotation speed, allowing the water to pass through the filter (8) more quickly, thereby improving filtration efficiency. This high-speed vortex rotation of water within the filter unit (3) improves filtration efficiency.

[0058] Furthermore, the direction of the connection of the drainage channel of the filtered water outlet opening into the filter unit main body (3) may be aligned with the clockwise or counterclockwise direction of the vortex rotation, rather than against it, because this will increase the drainage efficiency without impeding the vortex rotation.

[0059] Filtered water drawn from the filter unit main body (3) by the pump (4) passes through the drainage channel (14) and is discharged from the filtered water outlet (13), which is located below the water surface on the pool side wall (22), for example, 20 cm below the water surface. A water conveyance opening (26) is provided adjacent to the periphery of the filtered water outlet (13), and a water conveyance channel (16) is located opposite the filtered water outlet (13) on the periphery of the filter unit main body (3), for example, about 20 cm below the bottom. The water conveyance channel (16) utilizes the water level (24) of the pool (21) to convey water into the filter unit main body (3). Because the water conveyance opening (26) opens below the water surface (25), which is lower than the water surface (24), water from the pool naturally flows from the water conveyance channel (16) into the filter unit main body. If the water level in the filter unit body (3) drops too much due to the discharge of filtered water pumped out by the pump (4), the pump will run dry, making it difficult to adjust the pump. However, by providing this water conduit (16), the water level around the outer periphery of the filter unit body will naturally rise, preventing dry running and allowing the pump to operate stably without having to make detailed adjustments to its output.

[0060] Since the water that flows in from the water inlet (15) that opens on the outer periphery of the filtration unit main body (3) is submerged water, it is difficult for large floating debris to get mixed in. However, to prevent the untreated water from mixing with the filtered water on the outer periphery, a separate water inlet filter (27) is attached to the inlet (15).

[0061] 1 and 2, by forming a sidewall opening (28) in the pool sidewall (22) at a depth of about 20 cm, in which the water conveyance opening (26) is adjacent to the periphery of the filtered water outlet (13) (for example, concentrically), the number of holes in the pool sidewall (22) can be concentrated in one location, halving the amount of construction work required compared to two locations. Furthermore, because the water spurting from the filtered water outlet (13) flows outward, the force of the spurt makes it difficult to approach the water conveyance opening (26), providing greater safety than when the water intake, which must be opened underwater (25), is opened separately.

[0062] Furthermore, the water-conducting opening (26) in the pool sidewall (22) and the filtered water outlet (13) are integrated into a single adjacent opening, and a cylindrical opening cover (30) approximately 70 mm long is fitted into this opening, as shown in Figure 2. The cylindrical opening cover (30) can be made of plastic resin or may be elastic. The filtered water (20) filtered by the filtration unit body is discharged from the filtered water outlet (13) located in front of the cylindrical opening cover (30), and then sprayed through the cylindrical opening cover (30) into the water (25) in the pool (21). By slightly bending the tip of this cylindrical opening cover, the spray direction can be adjusted to a desired angle, such as slightly upward, slightly downward, slightly right, or slightly left, by pointing the tip of the cylinder in the desired direction. Because only filtered water (20) is sprayed from the cylindrical opening cover (30), even if an opening is provided underwater (25), safety is high. The water-conducting opening (26) is located underwater (25) below the water surface (24), allowing pool water to naturally flow from the water conduit (16) into the filter unit body. However, this water-conducting opening (26) opens near the pool sidewall just before the cylindrical opening cover (30). Since the interior of the cylindrical opening cover is essentially filled with clean filtered water from the filter unit body, the water returned from the water conduit (16) to the water inlet (15) on the periphery of the filter unit body (3) to adjust the water level from the pool side is almost entirely filtered water, not untreated pool water. Therefore, even if pool water is drawn into the water conduit to maintain the water level, the purity of the filtered water on the periphery of the filter unit body (3) is unlikely to decrease. Of course, in this case too, it is possible to take extra precautions by installing a water conduit filter (27) to purify the water flowing in from the water conduit (16).

[0063] When the above-described filtration device (1) is used, water is taken in from the water surface, and floating debris is efficiently taken into the main body of the filtration unit. The untreated water is swirled at high speed by the force of the water poured in from the shifted position, and passes quickly through the permeable filter. The water is then efficiently filtered by centrifugal force and discharged by the pump.

[0064] The vortex rotation speed and the suction force of the permeable filter can be confirmed specifically by the following procedure. A flat plastic resin plate, similar to a bread closure to resemble a fallen leaf, is tied to the end of a 1m nylon marking line, and hung from above the filter body.The plastic resin plate is observed to be drawn in, and the speed of vortex rotation and the adsorption power of the permeable filter can be evaluated based on the extent to which it rotates and is drawn inside.

[0065] When the flow rate of the vortex rotation is fast and the drawing force of the water passing through the permeable filter is strong, the plastic resin plate hanging on the surface of the water in the filter body not only spins around, but also sinks deep into the water and is sucked into the filter deep underwater.

[0066] On the other hand, if the vortex rotation is slow, the suction is weak, and the particles rotate slowly while floating on the surface of the water, rather than being drawn into the water, and are not drawn into the permeable filter and becoming immobile, but rather continue to spin around indefinitely.

[0067] First, in Comparative Example 1, a rectangular parallelepiped filter body was fabricated instead of a cylindrical one, and this was tried instead. However, water accumulated inside the four corners of the filter body, creating resistance to vortex rotation, preventing the vortex rotation speed from increasing and reducing filtration efficiency. The plastic resin plate attached to the end of the water line simply rotated slowly while floating on the surface of the filter body, and was not drawn in at all. In this way, the flow was slow and the drawing force was extremely weak in the rectangular body.

[0068] Next, in Comparative Example 2, the filter body was cylindrical, but the water intake outlet of the water intake section was oriented in the direction of the central axis of the filter body. As the water flowing into the center disrupted the water flow on the top surface of the filter body, the plastic resin plate did not rotate smoothly and did not sink deep.

[0069] In Example 1 of the present invention, the filter body (3) is cylindrical, and the direction of the intake outlet (7) of the water intake section (2) is shifted leftward from the central axis of the filter body (3) so that untreated water flows into the upper part of the filter body (3). As a result, the untreated water (19) swirls clockwise. The plastic resin plate then spins clockwise for a while, and then sinks into the water.

[0070] In Example 2 of the present invention, the filter body (3) is cylindrical, and the intake outlet (7) of the intake section (2) is shifted leftward from the central axis of the filter body (3) so that untreated water flows into the upper part of the filter body (3). Furthermore, the box-shaped intake section (2) is made into a truncated pyramid shape, and the intake outlet (7) has a narrow width and a cross-sectional area that is half that of the intake opening (6). Therefore, the outflow velocity at the intake outlet (7) is more than 2.5 times the inflow velocity at the intake opening (6). Therefore, the untreated water (19) flowing into the filter body is forced faster, causing a vortex rotation in a clockwise direction. The plastic resin plate then spun clockwise as it spun underwater.

[0071] In Example 3 of the present invention, the filter unit body (3) is cylindrical, and the intake outlet (7) of the intake unit (2) is shifted leftward from the central axis of the filter unit body (3) to allow untreated water to flow upward into the filter unit body (3). Furthermore, the box-like shape of the intake unit (2) is replaced with a truncated pyramid shape. The intake outlet (7) has a narrow width and a cross-sectional area that is half that of the intake opening (6). Furthermore, the bottom of the intake outlet (7) is 2 cm higher than the intake opening (6), resulting in a water depth of 2 cm shallower at the intake outlet (7). As a result, the outflow velocity at the intake outlet (7) is more than three times the inflow velocity at the intake opening (6). Therefore, the untreated water (19) flowing into the filter unit body (3) is forced even faster, due to the extra 2 cm drop, and thus vortexes clockwise with great force. The plastic resin plate then rapidly rotates clockwise and is sucked deep into the water.

[0072] As described above, during the filtration process using the filtration device of the present invention, a powerful flow is created by vortex rotation. The raw water (19) flowing into the center of the cylindrical frame (9) from the water intake (2) passes through the permeable filter (8) inside the frame (9) from the inner periphery to the outer periphery, undergoing vortex rotation and being filtered. The strong vortex rotation draws floating debris into the water, allowing it to be efficiently captured and filtered across the entire surface of the permeable filter. Specifically, large debris is captured first by the inner cylindrical bucket (17) and then by the honeycomb-like three-dimensional mesh structure of the permeable filter, while smaller floating debris is captured by the hydrophobic fiber layer. The chemical fiber layer can adsorb even smaller impurities.

[0073] According to the present invention, the water-permeable filter (8) can be maintained in good condition by removing it about once a week and washing it with strong running water from a hose, which is a simple procedure, and the filter can be reattached after washing. This prevents clogging and a decrease in filtering capacity, and the water-permeable filter can be used for a long period of time because maintenance is easy. [Industrial Applicability]

[0074] The filtering process using the purification device of the present invention can be installed on the side walls of indoor or outdoor swimming pools for home or commercial use, making it an easy-to-maintain filtering device that is ideal for maintaining the beauty of the pool's water surface. [Explanation of symbols]

[0075] 1 Filtration device 2. Water intake section 3 Filtration unit body 4. Pump 5 Pool side wall outlet 6 Water intake opening 7 Water intake outlet 8. Permeable filter 9 Frame 10 Outer Frame 11 Inner frame 12 Center axis 13 Filtered water outlet 14 Drainage Channel 15 Water Inlet 16 Waterway 17 Inner bucket 18 Upper space 19 Untreated Water 20 filtered water 21 Pool 22 Pool side wall 23 Pool bottom wall 24 Water surface 25 Underwater 26 Water conveyance opening 27 Water channel filter 28 Side wall opening 29 Drainage hole 30 Opening cover cylinder

Claims

1. A box-shaped water intake section having a water intake opening and a water intake outlet that open horizontally wide at the expected water level height of the pool side wall; a vertically elongated cylindrical filtration unit body having a height to diameter ratio of 2 to 5 and a cylindrical frame body with a vertical axis disposed downstream of the water intake outlet and shifted to either the left or right of the water intake outlet; a pump for discharging the water filtered by a flexible, detachable, and replaceable plate-shaped water-permeable filter housed in a cylindrical frame within the filtration unit body, which filters the water that has flowed into the filtration unit body from the water intake section to a filtered water outlet on the pool side wall, the filtered water being discharged from an outlet on the outer periphery of the filtration unit body; a water conduit for preventing dry operation, which is provided concentrically around the outer periphery of the outlet on the side wall of the pool from the water conduit opening on the side wall of the pool to the water conduit opening on the side wall of the filtration unit body; A pool filtration device equipped with

2. 2. The pool filtration device according to claim 1, wherein the box-shaped water intake portion is a truncated pyramid shape in which the cross-sectional area of ​​the downstream water intake outlet is smaller than the cross-sectional area of ​​the water intake opening.

3. 3. The filtering device for a swimming pool according to claim 1, wherein the filtered water outlet is open on the outer periphery of the lower part of the filtering unit body along the direction of the flowing water.

4. The pool filtration device according to claim 1, characterized in that the flexible plate-shaped water-permeable filter has a three-dimensional mesh structure on both surfaces of a plastic resin, and has at least an activated carbon layer and a chemical fiber cotton layer inside, which are laminated in layers to form an integrated plate-shaped material.

5. Untreated water is taken in from the vicinity of the pool water surface through a box-shaped water intake section having a water intake opening and a water intake outlet that open horizontally at the expected water level height on the side wall of the pool, The filter unit has a vertically elongated cylindrical shape, and is positioned downstream of the intake outlet with its central axis shifted to either the left or right of the intake outlet. The central axis of the filter unit is oriented vertically. Untreated water is forced to flow into the filter unit from above, creating a vortex-like flow. By directing water from the water conduit for preventing dry running from the side wall of the pool to the water conduit opening on the side wall of the filter unit body, the water level in the filter unit body discharged by the pump is kept from dropping too low, The swirling untreated water is filtered by passing it from the inner periphery to the outer periphery of a flexible, removable and replaceable plate-shaped permeable filter housed in a cylindrical frame within the filtration unit body. When the filtered water is discharged by a pump from the filtered water outlet provided on the outer periphery of the filter unit body to the outlet on the side wall of the pool, the water conveyance opening on the pool side wall of the water conduit is arranged concentrically on the outer periphery of the outlet on the side wall of the pool, making it a side wall opening that combines water conveyance and discharge, so that the water conveyance opening conveys water from the outer periphery to the filter unit body, while the filtered water is discharged from the outlet on the side wall of the pool as if it were being sprayed by the pump. Pool water surface filtration method.

6. The method for filtering the water surface of a pool as described in claim 5, characterized in that the box-shaped water intake section is made into a truncated quadrangular pyramid shape with a smaller cross-sectional area at the downstream outlet than at the water intake opening, thereby increasing the flow rate of untreated water, which is forced to flow in from above the vertically cylindrical filtration section body, causing it to flow in a vortex pattern.

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