WO2022234738A1 - Cycle filtration system - Google Patents

Abstract

Provided is a practical cycle filtration system.　Raw water 11 stored in a raw water tank 10 circulates by passing from the raw water tank 10 through a flow channel pipe 31 to be purified by a reverse osmosis membrane water purification unit 51 located in the middle of the flow channel pipe 31, then flowing toward a tap 71 and out of the tap 71 to be received by a bowl 72, and thereafter returning to the raw water tank 10. On the other hand, the raw water 11 stored in the raw water tank 10 circulates through a second flow channel pipe 34, regardless of whether the tap 71 is opened or closed, by means of a second pump 23 that is periodically driven, and is repeatedly purified by an ultraviolet sterilization device 92 and an aeration device 93 located in the middle of the second flow channel pipe 34.

Description

Circulating filtration system

The present invention relates to a circulation filtration system that uses the same water repeatedly.

For example, a hand-washing place is required at a construction site deep in the mountains. Such locations require a recirculating filtration system that uses the same water repeatedly.
This is because it is sometimes difficult to secure clean water, or even water itself, in such places, and it is also difficult to release dirty water after washing hands into the environment. .
Thus, in such locations, repeated use of the same water has the advantage of reducing the amount of water required and reducing the amount of dirty water released into the environment. A circulation type filtration system is useful.
Of course, recirculating filtration systems are available and may be used where only one of these two advantages is desired.

Roughly speaking, the circulation filtration system is as follows. A case where a circulating filtration system is used in a hand-washing area will be described as an example.
The circulation filtration system has a raw water tank that stores raw water. The raw water tank is connected to the base end of a flow channel pipe forming a flow channel for circulating raw water. A pump is provided somewhere in the flow pipe, and the raw water in the raw water tank is sent from the base end side of the flow pipe toward the tip end side by the pump.
Purification equipment for purifying raw water is appropriately provided in the middle of the flow pipe. The purification equipment is, for example, a filtration device for removing solids in the raw water, or an ozone generator or an ultraviolet sterilization device for removing chemical substances and microorganisms (bacteria, viruses, etc.) in the raw water. Raw water becomes purified water by passing through purification equipment.
A faucet is provided at the tip of the flow pipe, and a saucer, for example a sink, is provided under the faucet. When the faucet is operated, purified water in the channel pipe flows out. Dirty water generated by washing hands with the purified water is received by the tray.
The sewage received by the tray reaches the raw water tank and returns to the raw water. For example, if the tray is provided directly above the raw water tank, the sewage received by the tray drops into the raw water tank directly below. In some cases, a tube of some kind connects the pan and the raw water tank, and the sewage is led from the pan to the raw water tank via the tube.

Although the circulation type filtration system as described above can be established at least in principle, it cannot be said that it is sufficiently popular for the demand.
The reason for this is that it is difficult to obtain a sufficient quality of purified water from a circulation filtration system. As described above, in the circulation filtration system, raw water is purified by passing it through purification equipment. Here, when the circulating filtration system is used, for example, as a hand-washing place, the raw water may contain mud, oil, soap components, or the like. Technically, it is quite difficult to prepare purification equipment for converting such raw water into high-quality purified water. Moreover, in the circulation type filtration system, raw water is repeatedly used, which is all the more so.

The object of the present invention is to provide a practical circulation filtration system that can obtain high-quality purified water even if the raw water is heavily contaminated to some extent.

The present invention is as follows. Since the present invention can be roughly divided into two, they will be called the first invention and the second invention for convenience.
The first invention is as follows.
A first invention comprises a raw water tank for storing raw water, which is water that is to be circulated and used repeatedly, and a pipe that constitutes a flow path for circulating the raw water and whose base end is connected to the raw water tank. a conduit, a facility for purifying the raw water into purified water provided in the middle of the conduit, the purification facility including at least one reverse osmosis membrane water purification unit, and in the conduit, provided in the front side portion of the reverse osmosis membrane water purification unit located on the most distal side with respect to the flow pipe, when it is driven, the raw water in the flow pipe is transferred into the flow pipe a sub-pump for flowing to the tip side of the flow pipe; and a portion of the flow pipe that is driven in conjunction with the sub-pump when the sub-pump is driven, and is provided at a portion of the flow pipe that contacts the raw water in the raw water tank. A main pump that, when driven, causes the raw water in the raw water tank to flow to the tip side of the flow pipe, and a selection of permission or denial of discharge of the purified water from the flow pipe provided at the tip of the flow pipe. and a receptacle for receiving the purified water discharged from the faucet, and the purified water received by the receptacle reaches the raw water tank. Filtration system.
In this circulation filtration system, a pipe branched from the flow pipe by connecting the base end of the flow pipe before the sub-pump to form a flow channel for circulating the raw water. and a second purification facility, which is provided in the middle of the branch pipe and is a facility for purifying the raw water. Further, the purified raw water coming out of the tip of the branch pipe reaches the raw water tank, and the main pump is driven independently of the sub-pump. When the main pump is driven and the sub-pump is stopped, the sub-pump does not allow the raw water to pass through.

A circulation filtration system according to the first invention comprises a flow tube. A base end of the flow pipe is connected to a raw water tank for storing raw water, and a tap is provided at a tip of the flow pipe. There is a tray under the faucet, and the purified water received by the tray is returned to the raw water tank. Since the circulation type filtration system basically circulates the raw water with such a configuration, the amount of raw water can be reduced and no polluted water is discharged into the environment.
However, simply circulating the raw water does not make the water coming out of the faucet clean. In order to prevent such a problem, purification equipment, which is equipment for purifying raw water into purified water, is provided in the middle of the flow pipe. The purification equipment may be equipment for purifying raw water, and the details thereof are not limited, but at least one reverse osmosis membrane water purification unit is included. Examples of what constitutes the purification equipment are filter media that are not reverse osmosis membrane water purification units, ozone generators, ultraviolet sterilizers, and aerators.
In the circulation filtration system of the first invention, raw water is circulated in the flow pipe by the main pump and the sub-pump. The main pump is positioned at the proximal end of the flow pipe and has a function of flowing the raw water in the raw water tank toward the distal end of the flow pipe. On the other hand, the sub-pump is located in the middle of the flow pipe, more precisely, on the front side of the reverse osmosis membrane water purification unit located on the most distal side, and in the reverse osmosis membrane water purification unit located on the downstream side of the sub-pump. It has the function of applying the pressure necessary to force the water in the raw water to pass over the reverse osmosis membrane in the reverse osmosis membrane water purification unit.
By opening the faucet, the sub-pump is driven when the amount of raw water (or purified water) in the portion of the flow pipe on the tip side of the reverse osmosis membrane water purification unit is reduced, and is driven before the reverse osmosis membrane water purification unit. Raw water is supplied to the part ahead of the reverse osmosis membrane water purification unit. Then, since the amount of raw water on the front side of the reverse osmosis membrane water purification unit in the flow channel decreases, the main pump supplies raw water from the raw water tank to that portion. To enable this, the main pump is driven in conjunction with the sub-pump when the sub-pump is driven.
The configuration described so far of the circulation filtration system according to the first invention may be substantially the same as the configuration of the conventional circulation filtration system, although it depends on the case.

The circulation filtration system of the first invention comprises a branch pipe. A branch pipe is a pipe branched from a flow pipe by connecting its proximal end to the flow pipe before the sub-pump. The raw water coming out of the tip of the branch pipe is returned to the raw water tank.
A second purification facility is provided in the middle of the branch pipe. The second purification equipment is equipment for purifying raw water. The second purification equipment may be equipment for purifying raw water, and the details thereof are not limited. The second purification equipment may include, for example, at least one of a filtering material that is not a reverse osmosis membrane water purification unit, an ozone generator, an ultraviolet sterilizer, and an aerator. The ozone generator is a device that supplies ozone to the raw water passing through the branch pipe. The ultraviolet sterilizer is a device that irradiates raw water passing through a branch pipe with ultraviolet rays. An aerator is a device that supplies air bubbles to raw water passing through a branch pipe. The aerator supplies, for example, microbubbles or nanobubbles to the raw water. Ozone generators, ultraviolet sterilizers, and aerators improve the quality of raw water by different mechanisms.
In the circulation filtration system according to the first invention, raw water is circulated through the branch pipes by the main pump. As described above, the main pump is driven in conjunction with the sub-pump when the sub-pump is driven, but it can also be driven independently of the sub-pump. If the main pump is activated while the sub-pump is not activated, i.e. stopped, the sub-pump acts like a closed valve and does not allow raw water to pass through.
With such a configuration, when the main pump is driven while the sub-pump is stopped, the raw water flows from the raw water tank into the channel pipe, flows into the branch pipe branched before the sub-pump, flows through the branch pipe, and flows into the branch pipe. going back to the tank. At this time, the raw water is purified by the second purification equipment in the middle of the branch pipe.
According to the idea of the inventor of the present application, the reason why it was difficult to keep the raw water clean in the conventional circulation filtration system is as follows. That is, in the conventional circulation filtration system, the series of circulation paths of the raw water created by the flow pipe from the raw water tank to the faucet are necessary for purification because the raw water flows only when the faucet is opened. The time during which such a flow occurs in the raw water is very limited, and therefore it is difficult to sufficiently purify the raw water. On the other hand, if a circulation path different from the above-mentioned circulation path formed by the flow pipe is created and the raw water is purified there, it becomes possible to purify the raw water regardless of whether the faucet is open. Since the raw water can be purified as much as necessary, it is possible to obtain sufficiently purified raw water.
Based on this idea, the inventor of the present application adopted a branch pipe as a raw water circulation path different from the flow pipe, and adopted the second purification equipment as equipment for purifying the raw water flowing through the branch pipe. I did. Moreover, even if the branch pipe as described above is adopted in the first invention, only the originally existing main pump and sub-pump are required to flow the raw water through the branch pipe, and there is no need to adopt a new pump. Therefore, it is advantageous in terms of cost.

The main pump in the circulation filtration system of the first invention may be driven for eight hours or more a day independently of the sub-pump.
By driving the main pump to this extent, the raw water is well purified by the second purification equipment, so that the quality of purified water coming out of the faucet can be maintained at a high level. Of course, it is also possible to make the main pump independent of the sub-pump for longer than 8 hours, and by doing so, it is possible to improve the quality of the purified water that comes out of the faucet of the circulation filtration system. Become.
The main pump may be driven for a predetermined length of time every predetermined time. The "predetermined time" at which the main pump is driven at intervals may or may not be the same. The "predetermined time" during which the main pump is driven at one time may or may not be the same. By doing so, it is possible to determine the ratio of time for which the main pump is driven independently of the sub-pump to a desired ratio.

The circulation type filtration system according to the second invention is as follows.
The circulation filtration system according to the second invention comprises a raw water tank for storing raw water, which is water to be circulated and used repeatedly, and a flow path for circulating the raw water, the base end of which is connected to the raw water tank. a flow pipe, which is a pipe that is a flat pipe; a purification equipment, which is a facility for purifying the raw water into purified water and which is provided in the middle of the flow pipe, and which includes at least one reverse osmosis membrane water purification unit; a portion of the flow pipe provided on the front side of the reverse osmosis membrane water purification unit located on the most distal side with respect to the flow pipe, and when it is driven, the raw water in the flow pipe is a sub-pump for flowing to the tip end side of the flow pipe in the flow pipe; a main pump that, when driven, causes the raw water in the raw water tank to flow to the tip side of the flow pipe; The apparatus comprises a faucet capable of selecting permission or denial of discharge, and a tray for receiving the purified water discharged from the faucet, and the purified water received by the tray reaches the raw water tank. ing.
In the circulation filtration system of the second invention, a second flow different from the flow pipe is a pipe having a base end connected to the raw water tank, which constitutes the flow channel for circulating the raw water. and a passage pipe provided at a portion of the second passage pipe in contact with the raw water in the raw water tank, and when the pipe is driven, the raw water in the raw water tank flows to the tip side of the second passage pipe. A second pump for flowing the raw water and a second purification equipment for purifying the raw water provided in the middle of the second flow pipe are provided. Further, in the circulation filtration system of the second invention, the purified raw water discharged from the tip of the second flow pipe reaches the raw water tank, and the second pump is the main pump. and driven independently of the sub-pump.

The circulation filtration system of the second invention employs substantially the same configuration as the circulation filtration system of the first invention.
The circulation-type filtration system of the second invention also has flow pipes, like the circulation-type filtration system of the first invention. The base end of the channel pipe is connected to a raw water tank for storing raw water, as in the case of the circulation filtration system of the first invention, and the tip of the channel pipe is provided with a faucet. There is a tray under the faucet, and the purified water received by the tray is returned to the raw water tank. Therefore, since the circulation type filtration system of the second invention circulates the raw water in the same manner as in the first invention, the amount of raw water can be reduced, and polluted water is not discharged into the environment.
In addition, the circulation filtration system of the second invention is equipped with purification equipment, which is equipment for purifying raw water into purified water, in the middle of the flow pipe, as in the circulation filtration system of the first invention. . The purification equipment in the circulation filtration system of the second invention is the same as the purification equipment in the circulation filtration system of the first invention.
In the circulation filtration system of the second invention, raw water is circulated in the flow pipe by a main pump and a sub-pump, as in the circulation filtration system of the first invention. Both the main pump and the sub-pump in the circulation filtration system of the second invention are the same as those in the first invention. However, unlike the circulation filtration system of the first invention, the main pump in the second invention is not driven independently of the sub-pump.

Unlike the circulation filtration system of the first invention, the circulation filtration system of the second invention does not have branch pipes. Instead, the circulation filtration system of the second invention comprises a second flow pipe.
The second flow pipe is a pipe that forms a flow channel for circulating raw water and has a base end connected to the raw water tank. In the circulation filtration system of the second invention, the purified raw water coming out of the tip of the second flow pipe reaches the raw water tank. A second purification facility, which is a facility for purifying the raw water, is provided in the middle of the second flow pipe. The second purification equipment in the circulation filtration system of the second invention can be the same as the second purification equipment in the circulation filtration system of the first invention.
In the second invention, the raw water in the second flow pipe is provided in a portion of the second flow pipe in contact with the raw water in the raw water tank. Circulation is carried out using a second pump that flows to the tip side of the tube. The second pump is driven independently of the main pump and sub-pump.
That is, in the circulation filtration system of the second invention, the second flow forming the flow path that exits from the raw water tank and returns to the raw water tank is different from the flow path pipe that forms the flow path that exits from the raw water tank and returns to the raw water tank. By providing the channel pipe, the raw water can be discharged regardless of whether the faucet is opened by the second purification equipment in the middle of the second channel pipe, that is, regardless of whether the raw water or purified water in the channel pipe moves. This allows the raw water in the tank to be purified.
Unlike the circulation filtration system of the first invention, the circulation filtration system of the second invention requires a second pump. On the other hand, in the circulation filtration system of the second invention, unlike the circulation filtration system of the first invention, even when the sub-pump and the main pump interlocking with the sub-pump are driven, the second pump causes the second flow pipe to be filled. can circulate the raw water.

The second pump in the circulation filtration system of the second invention may be driven for eight hours or more a day.
If the second pump is driven to this degree, the raw water is well purified by the second purification equipment, so it is possible to keep the quality of purified water coming out of the faucet high. Of course, it is also possible to make the second pump independent of the sub-pump for a period longer than 8 hours, and by doing so, it is possible to improve the quality of the purified water coming out of the faucet of the circulation filtration system. becomes.
The second pump may be driven for a predetermined length of time at predetermined time intervals. The "predetermined time" that the second pump is driven at intervals may or may not be the same. The "predetermined time" for which the second pump is driven at one time may or may not be the same. By doing so, it becomes possible to determine the ratio of the time that the second pump drives independently of the main pump and the sub-pump to a desired ratio.

The description in this paragraph is common to the circulation filtration systems of the first and second inventions.
The circulation filtration system of the first invention and the second invention may be provided with a filter medium for filtering the purified water for passing the purified water from the receiving tray to the raw water tank. Purified water returning from the receiving tray to the raw water tank is already in a dirty state, such as containing mud and soap components, for example, when a circulation filtration system is applied to a hand-washing area. Instead of returning dirty purified water to the raw water tank as it is, it is easier to keep the raw water clean by returning it to the raw water tank after passing it through a filter medium.
Here, the filter medium for passing purified water returning from the receiving tray to the raw water tank may include at least one of an oil adsorption sheet, an ion exchange resin, and activated carbon, for example. The oil adsorption sheet is useful for removing oil contained in water passing through it, and the ion exchange resin is useful for removing surfactant contained in water passing through it. Yes, activated carbon is useful in removing heavy metals and odor causing substances contained in water passing through it. The filter medium may contain two or more of oil adsorption sheet, ion exchange resin and activated carbon, or all of them.
The filter medium for passing purified water returning from the receiving tray to the raw water tank may be incorporated in a bag filter. As a result, the filter medium can be replaced together with the bag filter, so that the labor and cost of replacing the filter medium can be reduced.

The figure which shows roughly the whole structure of the circulation-type filtration system by 1st Embodiment. FIG. 2 is a cross-sectional view conceptually showing the configuration of a reverse osmosis membrane water purification unit included in the circulation filtration system shown in FIG. 1 ; FIG. 2 is a cross-sectional view conceptually showing the configuration of a filtering member included in the circulation filtering system shown in FIG. 1; The figure which shows roughly the whole structure of the circulation-type filtration system by 2nd Embodiment.

Preferred first and second embodiments of the present invention will now be described in detail with reference to the drawings.
In the description of both embodiments, common reference numerals are given to common objects. In addition, overlapping explanations will be omitted in some cases.

<<First embodiment>>
FIG. 1 shows an overall configuration diagram of a circulation filtration system 1 according to the first embodiment. Although not limited to this, the circulating filtration system 1 in this embodiment is used for a wash basin.

The circulation filtration system 1 of the first embodiment includes a raw water tank 10 . The raw water tank 10 is a tank for storing raw water 11, which is water before being purified by a first purification facility, which is a purification facility to be described later.
The raw water tank 10 only needs to store the raw water 11 without leakage, and is made of metal or resin, for example. The raw water tank 10 may be a well-known or well-known tank, and may be a commercially available one. The capacity of the raw water tank 10 in this embodiment is, but not limited to, about 100 liters.

A main pump 21 is arranged in an appropriate portion of the raw water tank 10 in contact with the raw water 11 . The main pump 21 is a pump that can send water, and any pump that can do so may be used. The main pump 21 can be configured by a known or well-known pump, and may be a commercially available one.
The main pump 21 is connected to the proximal end of the flow pipe 31 . The main pump 21 guides the raw water 11 in the raw water tank 10 into the channel pipe 31 and causes it to flow toward the tip side of the channel pipe 31 .
The main pump 21 is connected to a computer 40 by a connection line 21A, and under the control of the computer 40, control of driving and stopping is performed. It is sufficient for the computer 40 to be able to perform such control, and it may be a known or well-known one, or a commercially available one. How the computer 40 controls the main pump 21 will be described later.

The flow pipe 31 is a pipe for circulating the raw water 11 in the raw water tank 10 as described later. The flow pipe 31 is sufficient as long as it can flow raw water (the raw water becomes the purified water 12 in the middle of the flow pipe 31 as will be described later). . The flow pipe 31 is made of metal or resin, for example.

The flow pipe 31 is provided with purification equipment for purifying the raw water 11 carried from the raw water tank 10 into purified water. The purification equipment may be any equipment for purifying the raw water 11, and includes at least one reverse osmosis membrane water purification unit 51, although the details thereof are not limited.
The purification equipment may also include filter media other than reverse osmosis membranes, an ozone generator, an ultraviolet sterilizer, and an aerator, but in this embodiment, they are not included in the purification equipment. An example of the filter medium is a well-known sediment filter provided upstream of the flow pipe 31 from the reverse osmosis membrane water purification unit 51, for example, upstream of the sub-pump 22.
The raw water 11 that has passed through the most downstream purification facility of the flow pipe 31 is the purified water 12 . In this embodiment, the raw water 11 becomes purified water 12 after passing through the reverse osmosis membrane water purification unit 51 .
As is clear from the above description of the sediment filter as a type of filter medium, other facilities such as the reverse osmosis membrane water purification unit 51 belonging to the purification facility, the filter medium including the sediment filter, the ozone generator, etc. The tube 31 need not be continuous. In the same way that the sediment filter can be provided on the upstream side of the sub-pump 22 in the flow pipe 31, another device such as an ozone generator can be provided further downstream of the accumulator tank described later in the flow pipe 31. It does not matter if it is provided.

The reverse osmosis membrane water purification unit 51 will be described. The reverse osmosis membrane water purification unit 51 is known or well-known, and may be commercially available. Therefore, only a brief description of the principle will be given.
A principle diagram of the reverse osmosis membrane water purification unit 51 is shown in FIG. The reverse osmosis membrane water purification unit 51 has a case 51A. The case 51A is, for example, a cylindrical pressure-resistant container.
The inside of the case 51A is divided into two spaces by a reverse osmosis membrane 51B. For example, in this embodiment, reverse osmosis membrane 51B is parallel to the axis of case 51A. Alternatively, the reverse osmosis membrane 51B may be cylindrical, and the space inside the case 51A may be divided into two spaces, one outside and one inside the reverse osmosis membrane 51B. The reverse osmosis membrane 51B does not need to be exclusively used for seawater because of the characteristics of the circulating hand washing unit. As an example, an Extra Low Energy RO Membrane series reverse osmosis membrane from FilmTec™ can be used as reverse osmosis membrane 51B.
An inlet 51C into which the raw water 11 flows is provided in one end face (lower side in FIG. 2) of the case 51A. A drain port 51D through which waste water, which is the concentrated raw water 11, flows out is provided on the other end face of the case 51A. The inlet 51C and the outlet 51D communicate with the same space of the two spaces inside the case 51A divided by the reverse osmosis membrane 51B. A purified water port 51E for discharging the purified water 12 produced from the raw water 11 by the reverse osmosis membrane water purification unit 51 is provided on the other end surface of the case 51A. The purified water port 51E communicates with the space on the side where the inflow port 51C and the water discharge port 51D do not communicate among the two spaces inside the case 51A divided by the reverse osmosis membrane 51B.
The raw water 11 flows into the case 51A from an inlet 51C to which the flow pipe 31 is connected. A high pressure is applied to the raw water 11 entering the case 51A from the inlet 51C by maintaining an appropriate relationship between the inflow of the raw water 11 from the inlet 51C and the outflow of waste water from the drain 51D. It's like
Among the highly pressurized raw water 11, water that is close to pure water is in communication between the inlet 51C and the outlet 51D of two spaces inside the case 51A divided by the reverse osmosis membrane 51B. From the space, it passes through the reverse osmosis membrane 51B and oozes out into the space communicating with the purified water port 51E.
That is, the raw water 11 is separated into the purified water 12 and the concentrated raw water 11 in the case 51A by the reverse osmosis membrane 51B. The raw water 11 and the purified water 12 are discharged from the case 51A through the drain port 51D and the purified water port 51E, respectively. The water purification port 51</b>E is connected to the flow pipe 31 on the downstream side of the reverse osmosis membrane water purification unit 51 . The drain port 51D is connected to a drain pipe, which will be described later.

A sub-pump 22 is provided upstream of the reverse osmosis membrane water purification unit 51 of the flow pipe 31 (raw water tank 10 side). The sub-pump 22 is a pump for supplying the raw water 11 at high pressure to the reverse osmosis membrane water purification unit 51 . The sub-pump 22 is a pump that can send water, and as long as it can do that, it may be of any type, like the main pump 21 .
The sub-pump 22 is connected to a computer 40 by a connection line 22A, and is controlled to be driven and stopped under the control of the computer 40. As shown in FIG. How the computer 40 controls the sub-pump 22 will be described later.

An accumulator tank 60 is provided downstream of the reverse osmosis membrane water purification unit 51 in the flow pipe 31 .
The accumulator tank 60 is for keeping the water pressure of purified water 12 coming out of a faucet, which will be described later, within a predetermined range. The accumulator tank 60 is made of a watertight tank and an elastic film material called Prada arranged in the tank, and a constant It is equipped with something like an airtight balloon filled with gas at a pressure higher than the pressure. Purified water 12 fills the gap between the prada and the tank. By setting the amount of the purified water 12 in the accumulator tank 60 within an appropriate range, an appropriate pressure is applied to the purified water 12 in the accumulator tank 60 from the prada.
The accumulator tank 60 is normally located above the faucet, and is so in this embodiment. Since the accumulator tank 60 is positioned above the faucet and an appropriate pressure is applied to the purified water 12 in the accumulator tank 60 from the prada, the purified water 12 coming out of the faucet, which will be described later, is applied with an appropriate water pressure. will come out from The accumulator tank 60 need not be located above the faucet 71 if sufficient pressure can be applied to the purified water 12 from the bladder within the accumulator tank 60 .
The water pressure of the purified water 12 in the accumulator tank 60 is detected by a sensor (not shown). , is sent to the computer 40 .

A faucet 71 is attached to the tip of the flow pipe 31 . The faucet 71 is a publicly known one or a well-known one, and allows selection of permission or denial of outflow of the purified water 12 .
As is well known, when the faucet 71 is open, purified water 12 comes out of the faucet 71, and when the faucet 71 is closed, the purified water 12 does not come out of the faucet 71.
Below the faucet 71, a saucer 72 for receiving purified water 12 discharged from the faucet 71 is provided. The saucer 72 is a sink with a drain. In the circulation filtration system 1 according to this embodiment, only the faucet 71 and the saucer 72 are required to be exposed to the outside, and all other parts need not be exposed to the outside.

A drain pipe 83 is connected to the drain port of the tray 72 . The drain pipe 83 is for guiding the purified water 12 received by the tray 72 to the raw water tank 10, and is vertical in this embodiment, although not limited to this. Purified water 12 discharged from the faucet 71 and received by the receiving tray 72 flows down through the drain pipe 83 by gravity and reaches the raw water tank 10 .
A filter member 84 is attached in the middle of the drain pipe 83 . The filter member 84 passes the purified water 12 from the tray 72 to the raw water tank 10 through the drain pipe 83 to filter and remove mud and soap components contained in the purified water 12 . Filtration member 84 in this embodiment provides filtration of dirty purified water 12 flowing down by gravity.
In this embodiment, although not limited to this, the filtering member 84 is as shown in FIG.
The filtering member 84 has a bag filter 84A. The bag filter 84A is a bag made of a mesh fabric, and has an open top, although not limited to this. Since many bag filters that can be used as the bag filter 84A are commercially available, a suitable one can be selected and used.
An oil adsorption sheet 84B is incorporated in the upper portion of the bag filter 84A. The oil adsorption sheet 84B is a sheet that removes oil contained in the purified water 12. As shown in FIG. A plurality of oil adsorption sheets 84B are stacked and housed in the bag filter 84A. As the oil adsorption sheet 84B, for example, an oil adsorption sheet (trade name Grease Screen (trademark) series) manufactured and sold by Asahi Kasei Home Products Corporation can be used.
A mixture 84C of ion exchange resin and activated carbon is incorporated in the lower portion of the bag filter 84A. Both the ion exchange resin and the activated carbon are in the form of powder, and are contained in the bag filter 84A in a mixed state.
The ion exchange resin in the mixture 84C is useful for removing surfactants contained in the dirty water 12 passing through it, and the activated carbon in the mixture 84C is useful for removing the surfactant contained in the dirty water 12 passing through it. It is useful for removing contained heavy metals and odor-causing substances.
It is sufficient that the filtering member 84 contains at least one of the oil adsorption sheet 84B, ion exchange resin, and activated carbon.
In addition, the bag filter 84A included in the filter member 84 is for facilitating replacement of the filter member 84. If the effect is not required, the oil adsorption sheet 84B, the ion exchange resin, and the activated carbon may be used. need not be housed in the bag filter 84A.

The circulation filtration system 1 in the first embodiment is equipped with a branch pipe 32 . The branch pipe 32 is a pipe that constitutes a flow path for circulating the raw water 11 in the raw water tank 10 through a path different from the above-described circulation path formed by the flow path pipe 31 .
The branch pipe 32 is a pipe whose base end is connected to the flow pipe 31 upstream of the sub-pump 22 , that is, to the base end side of the flow pipe 31 , and is branched from the flow pipe 31 . . The specifications of the pipes forming the branch pipe 32 may or may not be the same as those of the pipes forming the flow channel pipe 31 .
The raw water 11 coming out of the tip of the branch pipe 32 reaches the raw water tank 10. - 特許庁For example, the tip of the branch pipe 32 is located right above the raw water tank 10, and the raw water 11 coming out of the tip of the branch pipe 32 falls into the raw water tank 10 by gravity.

A second purification facility is provided in the middle of the branch pipe 32 . The second purification equipment is equipment for purifying the raw water 11 flowing through the branch pipe 32 . As long as the second purification equipment can purify the raw water 11, the details are not limited as long as it includes at least one of an ozone generator, an ultraviolet sterilizer, and an aerator.
The ozone generator has a function of supplying the raw water 11 with generated ozone. By supplying ozone to the raw water 11 , organic substances in the raw water 11 are decomposed by the oxidizing action of ozone, and the raw water 11 is purified. The decomposition of organic matter can also include the effect of killing or inactivating plankton, bacteria and viruses, for example. The ozone generator may be a known or well-known one, or may be a commercially available one. As the ozone generator, for example, a compact one that generates a relatively small amount of ozone of about 1000 mg/h that does not adversely affect the human body even if inhaled by a person can be used.
The ultraviolet sterilizer has a function of irradiating the raw water 11 with the generated ultraviolet rays. By irradiating the raw water 11 with ultraviolet rays, the effect of killing or inactivating bacteria and viruses can be obtained. The ultraviolet sterilizer may be a publicly known or well-known one, or may be a commercially available one. As the ultraviolet sterilizer, for example, an ultraviolet sterilizer for purification of running water equipped with a deep ultraviolet LED lamp manufactured and sold by Nikkiso Co., Ltd. can be used.
The aeration device aerates the raw water 11 by supplying microbubbles or nanobubbles, for example. By aerating the raw water 11, aerobic bacteria in the raw water 11 become active, thereby improving the water quality of the raw water 11. - 特許庁The aerator may be a publicly known or well-known one, or may be a commercially available one. It is preferable to use an aeration device that generates 100 million or more nanobubbles per 1 ml, for example.
In this embodiment, although not limited to this, an ozone generator 91 and an ultraviolet sterilizer 92 are provided in the middle of the branch pipe 32 as the second purification equipment. The raw water 11 passing through the branch pipe 32 is purified by the above-described principle by the ozone generator 91 and the ultraviolet sterilizer 92, and the quality of the water is improved.
The second purification facility may also include other facilities, such as sediment filters. The sediment filter is generally provided, for example, at the most upstream part of the second purification equipment.

As described above, in the reverse osmosis membrane water purification unit 51, the concentrated raw water 11 is discharged from the drain port 51D. The drain port 51D is connected to the proximal end of the drain pipe 33 . The tip of the discharge pipe 33 is connected to the upstream side (flow pipe 31 side) of the portion of the branch pipe 32 where the second purification equipment is provided.
As a result, the raw water 11 concentrated in the reverse osmosis membrane water purification unit 51 reaches the branch pipe 32 through the discharge pipe 33 and is purified by the second purification equipment provided in the middle of the branch pipe 32, thereby improving the water quality. After being improved, it reaches the raw water tank 10 .

Next, the usage and operation of the circulation filtration system 1 configured as described above will be described.

This circulation type filtration system 1 is applied to a hand-washing place as described above.
When the user wants to wash his/her hands, the user operates the faucet 71 to open the closed faucet 71 .
Then, the purified water 12 stored in the accumulator tank 60 has potential energy due to being in a relatively high position with respect to the faucet 71, and from the prada (not shown) arranged in the accumulator tank 60 Due to the pressure, the fluid flows from the accumulator tank 60 through the flow pipe 31 toward the faucet 71 and out of the faucet 71 . If the accumulator tank 60 is positioned lower than the faucet 71, then gravity will not contribute to the pressure exerted on the purified water 12 exiting the faucet 71, only the pressure from the prada.
The user washes his/her hands with the purified water 12 coming out of the faucet 71 . Here, for example, if the user uses soap, the clean water 12 will contain soap components, and if the user's hands are dirty, the clean water 12 will contain oil and mud. Purified water 12 soiled in this manner is received by a saucer 72 .

Dirty purified water 12 received by the receiving tray 72 flows down through the drain pipe 83 by gravity from the drainage port of the receiving tray 72 toward the raw water tank 10 .
The purified water 12 that has become dirty on the way passes through a filtering member 84 on the way of the drain pipe 83 . As described above, the filter member 84 is composed of the bag filter 84A, the oil adsorption sheet 84B housed inside the bag filter 84A, and the mixture 84C of ion exchange resin and activated carbon.
Of the solids contained in the dirty purified water 12, those larger than the mesh of the bag filter 84A are filtered and captured by the bag filter 84A. Oil contained in the dirty purified water 12 is captured by the oil adsorption sheet 84B. Some of the metal ions contained in the dirty water 12 and soap components are captured by the ion exchange resin. Also, some of the odorants and trihalomethanes contained in the dirty purified water 12 are captured by the activated carbon.
Therefore, by passing through the filtering member 84, the dirty purified water 12 becomes clean to some extent. Purified water 12 that has been cleaned to some extent comes out of the tip of drain pipe 83 and drops into raw water tank 10.例文帳に追加

On the other hand, as described above, in the accumulator tank 60 , the sensor detects the water pressure of the purified water 12 in the accumulator tank 60 .
Data about the water pressure are sent to the computer 40 at all times. The computer 40 sends drive signals to the main pump 21 and the sub-pump 22 via the connection lines 21A and 22A, respectively, when the water pressure of the purified water 12 becomes low (for example, when it falls below a certain value). Thereby, the main pump 21 and the sub-pump 22 are driven. That is, at this time, the main pump 21 and the sub-pump 22 are driven in conjunction with each other.
When the main pump 21 is driven, the raw water 11 in the raw water tank 10 sucked by the main pump 21 is sent from the proximal end of the flow pipe 31 to the distal end of the flow pipe 31 . On the other hand, the sub-pump 22 pumps the raw water 11 sent from the main pump 21 to the reverse osmosis membrane water purification unit 51 at a pressure that allows the water contained in the raw water 11 to overcome the reverse osmosis membrane 51B in the reverse osmosis membrane water purification unit 51. Send to 51. At this time, the amount of raw water 11 sent from the main pump 21 to the flow pipe 31 per unit time is approximately the same as the amount of raw water 11 sent from the sub-pump 22 to the reverse osmosis membrane water purification unit 51 per unit time. Also, the main pump 21 and the sub-pump 22 are controlled by the computer 40 .
As a result, the raw water 11 sent from the raw water tank 10 into the channel pipe 31 by the main pump 21 is sent to the reverse osmosis membrane water purification unit 51 by the sub pump 22 without going to the branch pipe 32 .

The raw water 11 sent by the sub-pump 22 enters into the case 51A of the reverse osmosis membrane water purification unit 51 through an inlet 51C provided in the case 51A.
A high pressure is applied to the raw water 11 entering the case 51A from the inlet 51 . As a result, water that is close to pure water contained in the raw water 11 flows out of the two spaces inside the case 51A divided by the reverse osmosis membrane 51B, where the inlet 51C and the outlet 51D communicate with each other. , passes through the reverse osmosis membrane 51B and oozes out into the space communicating with the purified water port 51E. That is, the raw water 11 is separated into the purified water 12 and the concentrated raw water 11 by the reverse osmosis membrane 51B in the case 51A.
Then, the purified water 12 reaches the flow pipe 31 through the water purification port 51E, passes through the flow pipe 31, and reaches the accumulator tank 60. As shown in FIG. Although the purified water 12 in the accumulator tank 60 is reduced by opening the faucet 71, the reduced purified water in the accumulator tank 60 is replenished by supplying the purified water 12 from the reverse osmosis membrane water purification unit 51. will be As described above, the water pressure of the purified water 12 in the accumulator tank 60 is constantly detected by the sensor, and water pressure data is constantly sent to the computer 40 . When the water pressure data reaches a predetermined range, for example, returns to the value before the faucet 71 was opened, the computer 40 sends the main pump 21 and the sub pump 22 via the connection line 21A or the connection line 22A. send a stop signal to stop their driving. Thereby, the main pump 21 and the sub-pump 22 stop driving.
On the other hand, the concentrated raw water 11 reaches the discharge pipe 33 through the discharge port 51D and reaches the branch pipe 32 from the discharge pipe 33 . The concentrated raw water 11 proceeds downstream through the branch pipe 32 and reaches the second purification equipment. As described above, the second purification equipment in this embodiment includes the ozone generator 91 and the ultraviolet sterilizer 92 . The concentrated raw water 11 is supplied with ozone from an ozone generator 91 and irradiated with ultraviolet rays from an ultraviolet sterilization device 92 to be purified and improved in water quality.
The raw water 11 whose water quality has been improved advances downstream through the branch pipe 32 , exits from the tip of the branch pipe 32 , and drops into the raw water tank 10 .

The above processing is executed each time the faucet 71 is changed from the closed state to the open state.
On the other hand, in this circulation filtration system 1, the following processing is executed regardless of whether the faucet 71 is open or closed.
In this circulation filtration system 1, the computer 40 drives only the main pump 21 for a predetermined length of time at predetermined intervals. The computer 40 incorporates a timer, and when a predetermined time comes, it drives only the main pump 21 by sending a drive signal to the main pump 21 via the connection line 21A.
When only the main pump 21 is driven, the main pump 21 tries to flow the raw water 11 stored in the raw water tank 10 from the base end of the flow pipe 31 toward the tip side of the flow pipe 31 . However, the sub-pump 22 that is not driven at this time functions like a closed valve in the flow pipe 31 and does not allow the raw water 11 to pass through. Therefore, the raw water 11 flows into the branch pipe 32 branched from the flow pipe 31 .
The raw water 11 that has flowed into the branch pipe 32 proceeds downstream through the branch pipe 32 in the same manner as the concentrated raw water 11 described above, and reaches the second purification equipment. The raw water 11 is supplied with ozone from an ozone generator 91 and is irradiated with ultraviolet rays from an ultraviolet sterilizer 92 to be purified and improved in water quality.
The raw water 11 whose water quality has been improved advances downstream through the branch pipe 32 , exits from the tip of the branch pipe 32 , and drops into the raw water tank 10 .
This process is performed, for example, every 30 minutes for 15 minutes. However, the time interval at which this process is started and the length of time each time this process is executed need not always be the same. Assuming that only the main pump 21 is driven for 15 minutes every 30 minutes, the raw water 11 stored in the raw water tank 10 is kept open for 12 hours out of 24 hours a day. It will be purified in the second purification facility regardless of whether or not it has been cleaned. By repeatedly performing purification in the second purification equipment, the raw water 11 in the raw water tank 10 is maintained in a purified state to some extent. , the purified water 12 purified by the purification equipment in the flow pipe 31 maintains good water quality.
The process of driving only the main pump 21 is preferably performed for eight hours or more a day. As a result, the quality of the raw water 11 in the raw water tank 10 can be kept high to some extent.
It should be noted that the process of driving only the main pump 21 can be prevented from being executed when the faucet 71 is in the open state. Even with this, for example, if the computer 40 is set to execute the process of driving only the main pump 21 even at night, the process of driving only the main pump 21 can be executed for eight hours or more a day. It is easy.
In the above description, the driving and stopping of the main pump 21 and the sub-pump 22 are controlled using the computer 40, but if similar control is possible, a simpler mechanism, such as an accumulator It is also possible to replace the computer 40 with a sensor provided on the tank 60, a switch associated with the sensor, a timer for driving the main pump 21, and the like.

<<Second embodiment>>
FIG. 4 shows an overall configuration diagram of the circulation filtration system 2 in the second embodiment. Although not limited to this, the circulating filtration system 2 in this embodiment is used for a wash basin.
The circulation filtration system 2 of the second embodiment has a considerable portion in common with the circulation filtration system 1 of the first embodiment. The circulation filtration system 2 of the second embodiment is configured in the same manner as the circulation filtration system 1 of the first embodiment, except for the portions described as differences below.

A circulation filtration system 2 of the second embodiment includes a raw water tank 10 . The raw water tank 10 provided in the circulation filtration system 2 may be the same as the raw water tank 10 provided in the circulation filtration system 1 of the first embodiment, which is the case in this embodiment.
In the circulation filtration system 2 of the second embodiment, the main pump 21 and the sub-pump 22, which are similar to those provided in the circulation filtration system 1 of the first embodiment, are interlocked to drive the raw water tank 10. A series of facilities are provided for circulating raw water 11 to the raw water tank 10 .
That is, the circulation filtration system 2 of the second embodiment includes a main pump 21, a flow pipe 31, a sub-pump 22, purification equipment, an accumulator tank 60, and a faucet 71.

Basically, the main pump 21, the flow pipe 31, the sub-pump 22, the purification equipment, the accumulator tank 60, and the faucet 71 included in the circulation filtration system 2 of the second embodiment are the same as those of the circulation filtration system 1 of the first embodiment. They may be the same as those provided, but not limited to this, in this embodiment except for the parts described below.
The main pump 21, flow pipe 31, sub-pump 22, purification equipment, accumulator tank 60, and faucet 71 provided in the circulation filtration system 2 of the second embodiment differ from the first embodiment in the configuration of the purification equipment. Further, the position of the sub-pump 22 in the circulation filtration system 2 of the second embodiment is different from that of the first embodiment due to the configuration of the purification equipment. In addition, the branch pipe 32 is not connected to the flow pipe 31 in the circulation filtration system 2 of the second embodiment. This is because the branch pipe 32 does not exist in the circulation filtration system 2 of the second embodiment, as will be described later.

The purification facility in the second embodiment is the same as in the first embodiment in that it is a facility for purifying the raw water 11 carried from the raw water tank 10 into purified water, as in the case of the first embodiment. . As in the first embodiment, the purification installation of the second embodiment includes at least one reverse osmosis membrane water purification unit. Further, as in the case of the first embodiment, in the circulation filtration system 2 of the second embodiment, the purification equipment includes a filter medium (for example, a sediment filter) that is not a reverse osmosis membrane, an ozone generator, an ultraviolet sterilizer, It may contain an aerator.
However, in the first embodiment, the reverse osmosis membrane water purification unit was only one reverse osmosis membrane water purification unit 51 provided in the flow path pipe 31, but the flow in the circulation filtration system 2 of the second embodiment The pipeline 31 is provided with two reverse osmosis membrane water purification units, a reverse osmosis membrane water purification unit 51 and a reverse osmosis membrane water purification unit 52 .
The reverse osmosis membrane water purification unit 51 and the reverse osmosis membrane water purification unit 52 may or may not be the same. However, the principle by which they purify the raw water 11 is the one explained using FIG. 2 and is common. For example, the reverse osmosis membrane water purification unit 51 and the reverse osmosis membrane water purification unit 52 may differ only in the reverse osmosis membrane 51B in FIG. Although not limited to this in this embodiment, the reverse osmosis membrane water purification unit 51 and the reverse osmosis membrane water purification unit 52 are the same.
In the first embodiment, the sub-pump 22 is provided upstream of the only one reverse osmosis membrane water purification unit 51 in the flow pipe 31 . On the other hand, in the second embodiment, the sub-pump 22 is positioned between the two reverse osmosis membrane water purification units 51 and 52 in the flow pipe 31 . However, if there are a plurality of reverse osmosis membrane water purification units, the sub-pump 22 may be arranged upstream of the most downstream unit. Therefore, the sub-pump 22 may be arranged upstream of the reverse osmosis membrane water purification unit 51 . This situation is the same even if there are two reverse osmosis membrane water purification units in the circulation filtration system 1 of the first embodiment.
In the second embodiment, as in the first embodiment, the raw water 11 that has passed through the most downstream purification facility of the flow pipe 31 becomes the purified water 12 . In the second embodiment, the raw water 11 becomes the purified water 12 by passing through the reverse osmosis membrane water purification unit 52 .

Further, as already described, the circulation filtration system 2 of the second embodiment does not have the branch pipe 32 provided in the circulation filtration system 1 of the first embodiment.
Instead, the circulation filtration system 2 of the second embodiment includes the second flow pipe 34 and the second pump 23, which were not present in the circulation filtration system 1 of the first embodiment. there is
The second pump 23 is arranged in a suitable portion of the raw water tank 10 within the range of contact with the raw water 11 . The second pump 23 may be equivalent to the main pump 21, and may be any pump capable of sending water.
The second pump 23 is connected to the proximal end of the second flow pipe 34 . The second pump 23 guides the raw water 11 in the raw water tank 10 into the second flow pipe 34 and causes it to flow toward the tip side of the second flow pipe 34 .
The second pump 23 is connected to the computer 40 by a connecting line 23A, and includes a main pump 21 connected to the computer 40 via a connecting line 21A and a sub-pump 22 connected to the computer 40 via a connecting line 22A. Similarly, under the control of the computer 40, control of driving and stopping is performed. Note that the computer 40 in the second embodiment may be equivalent to the computer 40 in the first embodiment.

The second flow pipe 34 is a pipe for circulating the raw water 11 in the raw water tank 10 as described later. The specifications of the second flow pipe 34 may be the same as those of the flow pipe 31, and are used in this embodiment, although not limited to this. The raw water 11 coming out of the tip of the second flow pipe 34 drops into the raw water tank 10 in the same way as the raw water 11 coming out of the tip of the branch pipe 32 of the first embodiment.
The second purification equipment, which was present in the branch pipe 32 in the first embodiment, is provided in the second flow pipe 34 in the circulation filtration system 2 of the second embodiment.
Also in the case of the second embodiment, as in the first embodiment, the second purification equipment is equipment for purifying the raw water 11 flowing through the second flow pipe 34 . As in the case of the first embodiment, the second purification equipment in the second embodiment only needs to be able to purify the raw water 11. As long as the details are not limited, the ozone generator, the ultraviolet sterilizer, and the aerator. contains at least one of
In this embodiment, although not limited to this, an ultraviolet sterilizer 92 and an aerator 93 are provided in the middle of the second flow pipe 34 as the second purification equipment. The raw water 11 passing through the second flow pipe 34 is purified by the above-described principle by the ultraviolet sterilization device 92 and the aeration device 93, and the quality of the water is improved.
The second purification facility may also include other facilities, such as sediment filters. The sediment filter is generally provided, for example, at the most upstream part of the second purification equipment.

In the first embodiment, the concentrated raw water 11 discharged from the reverse osmosis membrane water purification unit 51 is allowed to join the raw water 11 in the branch pipe 32 via the discharge pipe 33 .
In the second embodiment, the concentrated raw water 11 generated from the reverse osmosis membrane water purification unit 51 and the reverse osmosis membrane water purification unit 52 respectively flows through the discharge pipe 33 to the raw water 11 of the second flow pipe 34. It is designed to be merged. The connection portion of the tip of the discharge pipe 33 to the second flow pipe 34 in the second embodiment is the same as the connection portion of the tip of the discharge pipe 33 to the branch pipe 32 in the first embodiment. It is on the upstream side of the part where the equipment is provided.
As a result, the raw water 11 concentrated in the reverse osmosis membrane water purification unit 51 and the reverse osmosis membrane water purification unit 52 reaches the second flow pipe 34 via the discharge pipe 33, and reaches the second flow pipe 34. The water is purified by the provided second purification equipment, the water quality is improved, and then the raw water tank 10 is reached.

Next, the usage method and operation of the circulation filtration system 2 in the second embodiment configured as described above will be described.

The circulation filtration system 2 of the second embodiment is applied to a hand-washing area as in the case of the first embodiment.
When the user wants to wash his/her hands, the user operates the faucet 71 to open the closed faucet 71 .
Then, the purified water 12 stored in the accumulator tank 60 flows out from the faucet 71 as in the case of the first embodiment. The user washes his/her hands with the purified water 12 coming out of the faucet 71 . Here, for example, if the user uses soap, the clean water 12 will contain soap components, and if the user's hands are dirty, the clean water 12 will contain oil and mud. Purified water 12 soiled in this manner is received by a saucer 72 .
Dirty purified water 12 received by the receiving tray 72 flows down through the drain pipe 83 by gravity from the drainage port of the receiving tray 72 toward the raw water tank 10 .
The purified water 12 that has become dirty on the way passes through a filter member 84 in the middle of the drain pipe 83 and is purified. Purified water 12 that has been cleaned to some extent comes out of the tip of drain pipe 83 and drops into raw water tank 10.例文帳に追加
So far, it is the same as the first embodiment.

On the other hand, in the accumulator tank 60, the sensor detects the water pressure of the purified water 12 in the accumulator tank 60, as in the first embodiment.
Data about the water pressure are sent to the computer 40 at all times. The computer 40 sends drive signals to the main pump 21 and the sub-pump 22 via the connection lines 21A and 22A, respectively, when the water pressure of the purified water 12 becomes low (for example, when it falls below a certain value). As a result, the stopped main pump 21 and sub-pump 22 are driven. That is, at this time, the main pump 21 and the sub-pump 22 are driven in conjunction with each other.
When the main pump 21 is driven, the raw water 11 in the raw water tank 10 sucked by the main pump 21 is sent from the proximal end of the flow pipe 31 to the distal end of the flow pipe 31 . The main pump 21 feeds the raw water 11 to the reverse osmosis membrane water purification unit 51 while applying pressure enough to overcome the reverse osmosis membrane 51B in the reverse osmosis membrane water purification unit 51. - 特許庁Similarly, the sub-pump 22 feeds the raw water 11 to the reverse osmosis membrane water purification unit 52 while applying a pressure enough to push the water contained in the raw water 11 over the reverse osmosis membrane in the reverse osmosis membrane water purification unit 52 .
At this time, the main pump 21 and the sub-pump 22 are controlled by the computer 40 so that the flow rate per unit time of the raw water 11 flowed by the main pump 21 and the flow rate per unit time of the raw water 11 flowed by the sub-pump 22 are approximately the same. controlled.

The raw water 11 sent to the reverse osmosis membrane water purification unit 51 by the main pump 21 is separated into the concentrated raw water 11 and the purified raw water 11 close to the purified water 12 as described in the first embodiment. . The purified raw water 11 is directed to the sub-pump 22 via the flow pipe 31 and sent to the reverse osmosis membrane water purification unit 52 by the sub-pump 22 . The raw water 11 sent to the reverse osmosis membrane water purification unit 52 by the sub-pump 22 is separated into the concentrated raw water 11 and the purified water 12 by the same principle as the raw water 11 is purified by the reverse osmosis membrane water purification unit 51. be.
The purified water 12 generated from the reverse osmosis membrane water purification unit 52 reaches the flow pipe 31 and reaches the accumulator tank 60 through the flow pipe 31 . As a result, the purified water 12 in the accumulator tank 60, which is reduced by opening the faucet 71, is replenished. When the water pressure of purified water 12 in accumulator tank 60 reaches an appropriate range, computer 40 stops main pump 21 and sub-pump 22 .
On the other hand, the concentrated raw water 11 generated from the reverse osmosis membrane water purification unit 51 and the reverse osmosis membrane water purification unit 52 reaches the second flow pipe 34 via the discharge pipe 33 . The concentrated raw water 11 proceeds downstream through the second flow pipe 34 and reaches the second purification equipment. As described above, the second purification equipment in the second embodiment includes the ultraviolet sterilization device 92 and the aeration device 93 . The concentrated raw water 11 is irradiated with ultraviolet rays from an ultraviolet sterilizer 92 and aerated by an aeration device 93 to be purified and improved in water quality.
The raw water 11 whose water quality has been improved advances downstream through the second flow pipe 34 , exits from the tip of the second flow pipe 34 , and drops into the raw water tank 10 .

The above processing is executed each time the faucet 71 is changed from the closed state to the open state.
On the other hand, in this circulation filtration system 2, the following processing is executed regardless of whether the faucet 71 is open or closed.
In this circulation filtration system 2, the computer 40 drives the second pump 23 for a predetermined length of time every predetermined time. The computer 40 incorporates a timer, and drives the second pump 23 by sending a drive signal to the second pump 23 via the connection line 23A when a predetermined time comes.
When the second pump 23 is driven, the second pump 23 causes the raw water 11 accumulated in the raw water tank 10 to flow from the base end of the second flow pipe 34 toward the tip side of the second flow pipe 34. .
The raw water 11 flowing through the second flow pipe 34 advances downstream through the second flow pipe 34 and reaches the second purification facility in the same manner as the concentrated raw water 11 described above. The raw water 11 is purified and improved in quality, as is the case with the concentrated raw water 11 .
The raw water 11 whose water quality has been improved advances downstream through the second flow pipe 34 , exits from the tip of the second flow pipe 34 , and drops into the raw water tank 10 .
The timing of execution of this process and the length of one time when this process is executed are determined by the process in which only the main pump 21 is driven in the circulation filtration system 1 of the first embodiment. and the length of each time when the process is executed.
As a result, in the circulation filtration system 2 of the second embodiment, as in the circulation filtration system 1 of the first embodiment, regardless of whether the faucet 71 is open or not, the raw water in the raw water tank 10 is 11 will be repeatedly purified in the second purification facility. As a result, the raw water 11 in the raw water tank 10 is kept purified to some extent. Therefore, even in the case of the second embodiment, the purified water 12, which is once stored in the accumulator tank 60 coming out of the faucet 71 and purified by the purification equipment in the flow pipe 31, maintains good water quality.
In addition, in the second embodiment, the main pump 21, the sub-pump 22, and further the second pump 23 can be driven simultaneously.
In the second embodiment, as in the first embodiment, the computer 40 can be omitted and replaced with another simpler mechanism.

Claims (10)

1. a raw water tank for storing raw water that is circulated and used repeatedly;
   a flow path pipe having a proximal end connected to the raw water tank, which constitutes a flow path for circulating the raw water;
   A purification facility, which is provided in the middle of the flow pipe and which is for purifying the raw water into purified water, and which includes at least one reverse osmosis membrane water purification unit;
   provided in a portion of the flow pipe on the front side of the reverse osmosis membrane water purification unit that is positioned on the most distal side with respect to the flow pipe, and when it is driven, the raw water in the flow pipe is a sub-pump for flowing the fluid to the tip end side of the flow pipe in the flow pipe; a main pump that, when driven, causes the raw water in the raw water tank to flow to the tip side of the flow pipe;
   a faucet that is provided at the tip of the flow pipe and that allows selection of whether or not to allow the purified water to be discharged from the flow pipe;
   a saucer for receiving the purified water discharged from the faucet;
   and
   The purified water received by the saucer reaches the raw water tank,
   A circulation filtration system,
   a branch pipe, which is a pipe branched from the flow channel pipe by connecting the proximal end thereof to the flow channel pipe before the sub-pump, which constitutes the flow channel for circulating the raw water;
   a second purification equipment, which is equipment for purifying the raw water, provided in the middle of the branch pipe;
   and
   Purified raw water coming out of the tip of the branch pipe reaches the raw water tank,
   The main pump is driven independently of the sub-pump, and when the main pump is driven and the sub-pump is stopped, the sub-pump does not allow the raw water to pass through. there is
   Circulating filtration system.
2. The main pump is driven independently of the sub-pump for 8 hours or more per day.
   The circulation filtration system according to claim 1.
3. The main pump is driven for a predetermined length of time every predetermined time.
   The circulation filtration system according to claim 1.
4. a raw water tank for storing raw water that is circulated and used repeatedly;
   a flow path pipe having a proximal end connected to the raw water tank, which constitutes a flow path for circulating the raw water;
   A purification facility, which is provided in the middle of the flow pipe and which is for purifying the raw water into purified water, and which includes at least one reverse osmosis membrane water purification unit;
   provided in a portion of the flow pipe on the front side of the reverse osmosis membrane water purification unit that is positioned on the most distal side with respect to the flow pipe, and when it is driven, the raw water in the flow pipe is a sub-pump for flowing the fluid to the tip end side of the flow pipe in the flow pipe; a main pump that, when driven, causes the raw water in the raw water tank to flow to the tip side of the flow pipe;
   a faucet that is provided at the tip of the flow pipe and that allows selection of whether or not to allow the purified water to be discharged from the flow pipe;
   a saucer for receiving the purified water discharged from the faucet;
   and
   The purified water received by the saucer reaches the raw water tank,
   A circulation filtration system,
   a second flow pipe different from the flow pipe, which constitutes a flow channel for circulating the raw water and is a pipe whose base end is connected to the raw water tank;
   A second pump provided at a portion of the second channel pipe in contact with the raw water in the raw water tank, and when driven, causes the raw water in the raw water tank to flow to the tip side of the second channel pipe. When,
   a second purification equipment, which is equipment for purifying the raw water, provided in the middle of the second flow pipe;
   and
   Purified raw water coming out of the tip of the second flow pipe reaches the raw water tank,
   The second pump is driven independently of the main pump and the sub-pump,
   Circulating filtration system.
5. said second pump is adapted to operate for 8 hours or more per day;
   The circulation filtration system according to claim 4.
6. the second pump is adapted to run for a predetermined length of time at each predetermined time;
   The circulation filtration system according to claim 4.
7. The second purification equipment includes at least one of an ozone generator, an ultraviolet sterilizer, and an aerator.
   The circulation filtration system according to claim 1 or 4.
8. A filter medium for filtering purified water for passing purified water from the saucer to the raw water tank,
   The circulation filtration system according to claim 1 or 4.
9. The filter medium contains at least one of an oil adsorption sheet, an ion exchange resin, and activated carbon.
   The circulation filtration system according to claim 8.
10. The filter medium is built into a bag filter,
    The circulation filtration system according to claim 8 or 9.

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