WO2009115733A2

WO2009115733A2 - Method and system of filtering swimming pool water

Info

Publication number: WO2009115733A2
Application number: PCT/FR2009/050356
Authority: WO
Inventors: Claude Brenot
Original assignee: Claude Brenot
Priority date: 2008-03-07
Filing date: 2009-03-05
Publication date: 2009-09-24
Also published as: WO2009115733A3; FR2928396A1

Abstract

The system for filtering swimming pool water comprises a device for withdrawing water laden with solid particles for the pool at a suction outlet (E), a pre-filter basket (2), a device (10) for pumping the withdrawn water and returning it to the pool via a delivery nozzle, and a filtration device (4). The filtration device (4) comprises a filtration member (41) to which a liquid introducing head (T) is fitted. The liquid introducing head (T) incorporates a vortex separator device (3) comprising a chamber to create a first stream (Q1) of liquid laden with solid particles which is removed downwards to the periphery of the chamber and a second stream (Q2) of liquid with a lower particle content which is removed via an orifice situated in the central part of the chamber through a flow regulating device (7) towards the outlet of the filtration device (4). The system makes it possible to ensure continuous circulation of the water even if the filtration device becomes clogged.

Description

Method and system for filtering the water of a swimming pool.

The present invention relates to a system for filtering the water of a swimming pool, comprising a device for taking water from the pool loaded with solid particles at a suction mouth, a pre-filter basket, a device for pumping water withdrawn and returned to a discharge nozzle in the basin, and a filtration device.

The invention also relates to a method for filtering water from a swimming pool.

Filtration of swimming pool water is often provided by sand filters placed at the discharge of the recycling pumps. The latter do not stop very fine particles (less than 20 μm) and require the use of flocculants when the basins are very polluted. They must be cleaned frequently so as not to interrupt the flow of the pump.

Another method of filtration used is to replace the sand filter with a textile bag, most often placed at the suction of the recycling pump. In this case, it is possible to filter much finer particles (less than 6μm) without requiring the use of flocculants. Unfortunately, these textile filters clog very quickly, being only partially filled, because they work "on the surface" and not

"in volume". It is therefore necessary to clean them even more often than the sand filters to avoid interrupting the flow of the pump and thus stopping cleaning and chemical treatment of the pool.

By way of example, reference is made to FIGS. 21 and 22, an example of a known filtration system which uses a textile filter placed inside the filtering means F and constitutes a compact filter assembly D which can be mounted on the filter. wall of a swimming pool SP. In this particular embodiment, a filtration compartment A is placed inside the swimming pool SP while a pumping compartment B including the pumping means P is placed outside the basin.

Particle-laden water is captured at an inlet mouth E which may be constituted by a surface skimmer or skimmer. Water is first introduced into a PF-shaped pre-filter Removable frustoconical basket whose walls are perforated and which is intended to retain the largest solid particles (leaves, insects, ...). The water is then sucked towards the bag-shaped textile filter. The filtered water exits the filtration device F through a strainer C to be pumped by the pumping means P through the suction lines TA and discharged by the discharge pipes TR to a nozzle R of return of the filtered water to the pool pool SP.

As already indicated above, the bag of textile material tends to clog on the surface quickly, even before the bag has been completely filled, which causes stops of the water recycling circuit and involves every time a painful cleaning operation.

It has also already been proposed to insert inside a filter bag a device for creating a swirling movement of the water by vortex effect. In this case, the water which is subjected to a vortex movement is however projected radially towards the filter bag, which contributes to press the particles on the walls of the filter bag which is thus clogged on the surface before being filled. Such a device has thus not made it possible to remedy the aforementioned drawbacks.

The invention aims to improve the various existing filtration systems by allowing a better operation of the filters to reduce the frequency of cleaning. The invention also aims to ensure a permanent flow of water in the basin.

The invention also aims to make it easy to adapt existing installations to improve their operation and make their maintenance easier. One of the aims of the present invention is to improve the quality of pool cleaning by avoiding the interruption of the flow of the pump when the filter becomes dirty, so as to ensure the continuity of the chemical treatment and the operation of a robot cleaning the bottom of the pool connected to the return of water in the basin. These goals are achieved through a water filtration system of a pool, including a water withdrawal device basin loaded with solid particles at a suction mouth, a pre-filter basket, a device for pumping water withdrawn and returned to a discharge nozzle in the basin, and a filtration device, characterized in that the filtering device comprises a filtering member on which is placed a liquid introduction head, in that the liquid introduction head incorporates a vortex separator device comprising a chamber for creating a first flow of liquid. charged with solid particles evacuating downwards around the periphery of the chamber and a second stream of liquid lightened in particles evacuating through an orifice located at the central part of the chamber through a device for regulating flow towards the outlet of the filtration device.

The vortex separator device is advantageously provided with at least two tangential liquid introduction nozzles regularly distributed around the periphery of the chamber. Preferably, the vortex separator device comprises between three and twelve tangential introduction nozzles of liquid regularly distributed around the periphery of the chamber.

In order to have an optimized operation with a high swirling speed, the chamber of the vortex separating device is delimited by a smooth peripheral wall and a smooth ceiling. The peripheral wall may be cylindrical or frustoconical.

According to a particular embodiment, the flow control device of the second flow comprises a valve applied by a calibrated spring on the orifice located at the central part of the chamber.

The discharge port of the second liquid stream may be located at the upper central portion of the chamber or at the lower central portion of the chamber. When the filter member comprises a pocket placed in a bowl, the system may comprise a cavity located on the side of the outer face of the valve and connected directly by horizontal and vertical channels inside the bowl but outside the the pocket of textile material.

According to a first embodiment of the invention, the filtration device is disposed on a suction pipe of the pumping device. According to another embodiment of the invention, the filtration device is disposed on a discharge pipe of the pumping device.

Advantageously, the liquid introduction head is equipped with a flow straightener comprising guide vanes for creating vertical low speed vertical laminar flow at the inlet of the filter member.

According to a particular embodiment, the direct vanes of the flow straightener comprise median vertical walls forming a cross delimiting independent sectors and radial vanes disposed in each of the sectors and attached to a cylindrical peripheral wall.

In this case, preferably, the flow rectifier comprises an upper horizontal wall forming a ceiling and liquid inlets formed at the upper peripheral portion of the rectifier.

The presence of a flow rectifier prevents a filter element such as a textile pouch from clogging rapidly on the surface.

The filtering member may thus comprise a bag of textile material disposed inside a sealed bowl provided with a strainer and a lower orifice for discharging the filtered water.

According to another aspect of the invention, the filtration system comprises a pre-filter basket superimposed on the head and comprising a bottom grid and a lateral cylindrical wall provided with a notch for introducing water.

In the case where the discharge orifice of the second flow of liquid is located at the lower central part of the chamber of the vortex separator device, the liquid introduction head may comprise a flow rectifier disposed in the bottom of the chamber. said chamber and comprising, in a peripheral annular portion concentric with the discharge orifice of the second flow of liquid, a set of blades in the form of propeller blades oriented with respect to the gyratory movement of the fluid in the chamber so as to each have a prominent front edge. Such a rectifier placed at the inlet of the collector favors in particular the collection of light particles. The invention also relates to a method for filtering the water of a swimming pool comprising the steps of taking water from the basin loaded with solid particles at a suction mouth, to perform a prefiltration of the largest solid particles, to pump the water taken to push back to a discharge nozzle in the basin, and to filter, using a filter element, the water charged with solid particles before its discharge in the basin, characterized in that it further comprises the step of vortexing a vortex flow with the water taken off charged particles so as to create a first flow of liquid laden with solid particles evacuating in a peripheral portion from below to a collector or flow rectifier, and a second stream of liquid lightened in particles evacuating in central part through a flow control device directly ve rs the outlet of the filter member without passing therethrough, so as to ensure a permanent flow of liquid to the discharge nozzle even in case of clogging of the filter member.

Advantageously, the method further comprises the step of introducing the particulate-laden water into the filter member using a flow straightener with guide vanes to create a central vertical laminar flow at low speed at the inlet of the filter element.

The invention also makes it possible to carry out an operation of cleaning the pool of the pool by means of a robot connected to the delivery nozzle permanently supplied with filtered or lightened water particles.

Other characteristics and advantages of the invention will emerge from the following description of particular embodiments, given by way of example with reference to the accompanying drawings, in which: FIG. 1 is a block diagram showing a first example of implementation of the invention with a filtration device located on the suction side of a pumping device;

FIG. 2 is a diagrammatic sectional view of a first example of a filtration device that can be used in a filtration system according to the invention; FIG. 3 is a perspective view of an example of a pre-filter basket that can be used in a system according to the invention;

FIG. 4 is a perspective view of an example of a filtration device that can be used in a system according to the invention; FIG. 5 is a diagrammatic view in axial section of a second example of a filtration device that can be used in a system according to the invention;

- Figures 6 and 7 are perspective views of a liquid introduction head in a filter device of a system according to the invention, the rectifier portion being removed in Figure 6;

Figure 8 is a horizontal sectional view of the head of Figures 6 and 7 showing transfer channels of a second liquid flow along the line VIII-VIII of Figure 9;

Figure 9 is a partial vertical sectional view of the head of Figure 7;

Figure 10 is a bottom plan view of the head of Figure 7;

- Figure 11 is a vertical sectional view along the line XI-XI of Figure 12 showing an example of a valve implemented in the head of Figures 6 to 10;

- Figure 12 is a horizontal sectional view along the line XII-XII of Figure 11;

13 is a perspective view of an exemplary filter bag equipped with a liquid introduction head according to the invention; FIG. 14 is a block diagram showing another example of implementation of the invention with a filtration device located on the discharge side of a pumping device;

- Figure 15 is a partial view in axial section of another embodiment of the invention more compact; - Figure 16 is a sectional view along line XVI-XVI of the

Figure 15 showing liquid injection nozzles;

Figure 17 is a top view of a liquid collecting member of the device of Figure 15;

Figure 18 is a section on the line XVIII-XVIII of Figure 17; Figure 19 is an exploded perspective view showing a portion of the FIG. 15 FIG.

Fig. 20 is a perspective view of an exemplary flow straightener disposable at the inlet of the liquid collector of the device of Fig. 15; and

- Figures 21 and 22 are perspective views in vertical section of an example of compact fiitration system designed to filter the water of a swimming pool.

The present invention makes it possible to improve the operation of existing fi ltration plants, such as for example those described above with reference to FIGS. 21 and 22, which implement filter bag fi ltration devices made of textile material, arranged side of the suction of a water recirculation pump. The invention can, however, also be applied to other types of fiitration installations, for example sand filter fiiteration systems, or fiiteration systems whose fi lter device is located on the discharge side of the fi ltration system. recirculating water pump.

The invention essentially involves a liquid introduction head T to be filtered in a fiiteration device which may itself be conventional, such as the fi lter device 4 of FIGS. 2 and 4 which comprises a bowl 40 forming a chamber rigid which is open at its upper part to receive the water to be filtered and comprises a bottom provided with an opening 46 to transfer the filtered water in a pipe 6. The bowl 40 can be mounted on a wall 12. In the case of Figure 2, we see a flexible filter bag 41 of textile material which rests on a strainer 5 and which is introduced into the bowl 40 through the upper opening thereof.

In known devices such as those described above with reference to FIGS. 21 and 22, the particulate-laden water is often introduced into the filter bag by being projected laterally towards the wall of the bag which then clogs rapidly on the surface.

According to the invention, a liquid introduction head T comprises a flow straightener 20 comprising a cylindrical peripheral wall 26 and a plurality of steer vanes 24, 25 for creating a vertical low speed laminar flow at the inlet of the inlet. filter bag 41. An example of a rectifier 20 is illustrated in FIGS. 7, 9 and 10 and shows guide vanes comprising, on the one hand, median vertical walls 24 forming a cross and delimiting independent sectors and, on the other hand, radial vanes 25 arranged in each sectors, which are attached to the peripheral wall 26 but are interrupted at a distance from the vertical vertical walls 24.

The flow rectifier further comprises an upper horizontal ceiling wall 35 and liquid inlets 32 which are preferably formed at the upper peripheral portion of the rectifier 20 (Figure 9).

FIG. 4 shows a head T having an outer upper face 13 provided with openings 14 at its peripheral portion for receiving the liquid to be introduced into the filtration device 4. Recessed portions 61 formed in the peripheral portion of the head T can be used as a means of prehension.

FIGS. 2 and 3 also show a pre-filter basket 2 which can be superimposed on the head T.

Such a pre-filter basket 2 comprises a bottom grid 22 and a lateral outer wall 23 preferably cylindrical provided with a notch 21 for introducing liquid. Such a pre-filter basket 2 is able to retain larger particles such as leaves or branches and can settle and be easily deposited. Because of the side entrance 21, the pre-filter basket 2 may have a height that exceeds the pool water level, which increases its volume. The water freed from its largest waste in the pre-filter basket 2 enters the filtration device 4 through the head T provided with its flow straightener 20, so that the water is not sprayed directly against the walls of the filter bag 41, which slows the rate of fouling thereof. According to another aspect of the invention, illustrated in particular on

5 to 9, the liquid introduction head T comprises a vortex separation-settling module 3 which is interposed between the upper wall 13 of the head T and the flow rectifier 20. This separation module 3 decantation comprises a chamber 30 for creating a first flow Ql of liquid loaded with solid particles evacuating at the periphery of the chamber 30 to the flow rectifier 20 and a second stream Q2 liquid lightened particles discharging through an orifice 15 located at the upper central part of the chamber 30 towards the outlet of the filtration device 4 through a flow control device marked by the references 7 and 107 on the Figures 1 and 14 and constituted by the valve 17 of Figures 5, 9, 11 and 12.

FIG. 1 illustrates an embodiment with the implementation of a vortex separation-settling module 3 in combination with a filtration device placed on the suction side of a recycling pump 10. In this case, the waste-laden water is taken from the pool of liquid through a mouth E such as a surface skimmer or skimmer to be fed via a pipe 1 to a removable pre-filter basket 2 which holds the largest waste. The water still charged with solid particles leaving the pre-filter basket 2 is introduced into the vortex separation-settling module 3. A first flow Ql of liquid loaded with solid particles from the separation-separation module 3 is introduced into a filter bag or a sand filter of a filtration device 4. In the case of a filter bag, it is important that this introduction takes place through a flow rectifier associated with the separation-settling module 3.

A second flow Q2 liquid lightened solid particles passes through a flow controller 7 and channels or channels 8 to join the first flow Ql from the filtration device 4 and its associated strainer 5 and flowing in a pipe 6. The flow total Ql + Q2 is recycled by the recycling pump 10 to a discharge pipe 11 which is connected to one or more nozzles R back in the pool of the pool.

It should be noted that, alternatively, the second flow Q2 can be reinjected at the outlet of the filtration device 4, upstream of the strainer 5, as in the embodiment which will be described in more detail with reference to FIGS. 5 to 12.

Figure 14 illustrates another embodiment of the invention. In this case, the water loaded with dirt taken from the pool of the pool by a mouth E such as a skimmer is introduced into a pre-filter basket 102 which may or may not be similar to the pre-filter basket 2 of Figure 3, and fed by a pipe 101 to a recycling pump 110.

The entire flow of liquid flowing in a discharge pipe 109 is introduced into a vortex separating-settling device 103, such as the device 3 which will be described in more detail with reference to FIGS. 5 to 12. A first flow Ql of liquid loaded with particles is discharged at the bottom of the separation-settling module 103 at the periphery thereof and introduced into a filtration device 104 while a second stream Q2 of liquid lightened in particles is evacuated to the central part. of the separation-settling module 103, either in the upper part or in the lower part, through a flow regulator 107.

The liquid flows Q1 and Q2 flowing in the ducts 106, 108 respectively, are joined in a delivery pipe 111 to one or more nozzles R back to the basin.

The embodiments of FIGS. 1 and 14 guarantee a permanent flow of liquid between an inlet E and a return R, even when a filter of the filtration device 4, 104 begins to foul, which makes it possible to ensure the continuity a chemical treatment of the pool water and also to ensure the continuous operation of a cleaning robot activated from a discharge nozzle R.

The embodiment of Figures 5 to 13 discloses a vortex separation-settling module 3 which is integrated in a head T for feeding a textile bag filter 41 which can be fixed directly on the periphery of the rectifier 20 of the T head, for example by a collar 42 provided with a quick opening system 43 (Figure 13), the bag 41 being disposed in a bowl 40 on which the head T with the interposition of a seal 44 ( Figures 6, 7, 9 and 13). Centering studs 45 formed on the outer peripheral wall of the separation-settling module 3 make it possible to adjust the position of the head T in the bowl 40.

The water prefiltered by the pre-filter basket 2 enters the head T through orifices 14 formed in the upper wall 13 of the head T. The inside of the bowl 40 is placed under vacuum by the recycling pump 10 whose tubing 6 is connected directly to the lower orifice 46 of the bowl 40. A bottom strainer 5 protects the pump 10 from any waste accidentally introduced into the bowl during cleaning operations (Figure 5).

The flow rate Q1 of liquid loaded with vortex trapped particles is taken by openings 32 formed in the lower peripheral portion of the module 3 defining the cavity 30. The flow Ql of liquid is transferred through the flow rectifier 20 which eliminates the nature swirling of the flow through its guide vanes 24, 25. Thus introduced into the pocket 41 a central laminar flow at low speed. This arrangement has the effect of considerably improving the filling of the bag 41, as the particles settle in the bottom of the bag 41 instead of sticking immediately on the walls by clogging them quickly, as in the case where a Swirl flow would be applied directly without flow straightener. With the device according to the invention, the particles decanted by gravity at the bottom of the cavity 30 continue to fill the pocket 41, even when the flow Ql is reduced, which makes it possible to space the cleaning of the pocket 41.

The water introduced by the lumens 14 into the head T tangentially enters the cavity 30 by nozzles 31 regularly distributed in the peripheral wall 34 of the separation-decantation module 3. The number of nozzles 31 is preferably between two and five and is advantageously equal to three. The nozzles 31 must be regularly distributed and the sum of their sections is a function of the flow rate of the pump 10. It is also possible to implement a larger number of nozzles, for example twelve in a variant embodiment which will be described later. with reference to Figures 15 to 20.

The separation-settling module 3 comprises a smooth upper wall 33 pierced with a central opening 15, a smooth peripheral wall 34 in which the nozzles 31 are formed, and a bottom wall 35 which constitutes the ceiling of the rectifier 20. The vortex flow in the cavity 30 can thus have a high rotational speed which favors the concentration of the particles at the periphery (Figures 6 and 9). In the example shown, the section of the rectifier 20 is slightly smaller than that of the separation-decantation module 3, forming a shoulder 36, but this is not mandatory. The flow of liquid is removed from the chamber 30 by peripheral lower openings 32 to the flow rectifier 20.

The flow Q2 of lightened liquid particles is taken at the center of the cavity 30 by a central opening 15. In this place, the concentration of the particles is minimal. The flow is controlled by a valve 17 applied to the orifice 15 by a spring 18 calibrated so that the valve opens when the depression in the bowl 40 increases under the effect of the progressive clogging of the bag 41 and reaches a predetermined value between about 10 and 30% of the maximum depression that the pump 10 can generate before defusing.

A cavity 51 formed above the upper face of the valve 17, that is to say the side of the outer portion thereof, is connected directly to the inside of the bowl 40 by horizontal channels 52 and vertical 53 by shorting the filter bag (Figure 8). The vacuum existing in the suction pipe 9 of the pump 10 therefore applies to the upper face of the valve 17.

This arrangement allows initially (clean pocket 41) to pass the entire flow rate of the pump 10 in the pocket 41 until it begins to create a pressure drop that leads to the opening of the valve 17 and to the appearance of the flow Q2. The latter increases progressively with the clogging of the pocket 41, making it possible to maintain an overall flow Ql + Q2 sufficient to ensure the continuity of the chemical treatment, that of the cleaning of the basin (filtration up to the saturation of the pocket 41) and the operation a cleaning robot.

As can be seen in Figures 11 and 12, the valve 17 can be free and simply guided by three guide rails 54, which facilitates communication between the chamber 51 and the horizontal transfer channels 52. A housing 55 of protection which delimits the chamber 51 above the valve 17 is mounted, with the interposition of a seal 56, on the upper face 13 of the head T (Figures 4, 11 and 13). This housing 55 also covers the setting spring 18 which may or may not be equipped with a screw 19 adjustment.

The presence of the separation-decantation module 3 makes it possible to ensure that a complementary stream of liquid Q2 partially freed of its particles by the vortex effect can be directed towards the pump 10, when the flow rate Ql of the main stream of filtered liquid is greatly reduced as a result of the clogging of the filter bag 41, so that it can be ensured a continuity of the liquid recycling in the pool and thus a cleaning continuity of this, as well as the continuity of operation of a cleaning robot connected to a discharge nozzle R.

Furthermore, the separation-settling module 3 and the flow rectifier 20 make it possible to optimize the filling of a filter bag 41 since the filling thereof can continue even when the flow rate Q1 of the liquid flow is reduced. when the filter bag 41 is clogged. The separation-settling module 3 makes it possible to settle by gravity the concentrated particles by vortex effect so as to continue slowly filling the bag 41, even when the liquid flow rate Ql is low. It may also be noted that a head T according to the invention can cooperate with a bowl 40 and a filter bag 41 constituted by standard elements.

FIGS. 15 to 20 show an alternative embodiment of a filtration device according to the invention which has a very compact character.

This filtration device 204 may be used under the same conditions as the device 4 of FIG. 1 or the device 104 of FIG. 14.

The filtration device 204 comprises a sealed bowl 240 provided with a strainer, not shown. The sealed bowl 240 may be similar to the bowl 40 already described with reference to Figures 1, 4 and 5 and may be connected to a horizontal wall 213.

The filtration device 204 comprises a liquid introduction head T which has the same functions as the head T of the device already described and has, at its lower part, a cylindrical wall 245 on which is connected a filtering member 241, by example in the form of a pocket.

As in the other embodiments, a pre-filter basket

202 is superimposed on the head T and preferably partially engaged therein below the horizontal wall 213. The pre-filter basket 202 has, in its part recessed in the head T ₁ a gate 222 defining slits in the bottom and the side wall of the pre-filter basket 202. In the portion projecting above the wall 213, the pre-filter basket 202 comprises a side wall 223 in which a notch 221 is formed. water introduction. The liquid introduction head T incorporates, as in the previous embodiments, a vortex separator device 203 comprising a chamber 230 with a smooth side wall 234. Figures 15 and 19, there is shown a frustoconical side wall 234 with a small base directed upwards. This configuration, which improves the transfer of the heavy particles to the periphery of the chamber, can also be applied to the other embodiments described. However, the wall 234 could also be cylindrical.

A smooth horizontal wall 233 constitutes a ceiling for the chamber 230 and comprises, at its peripheral part, radial slots or notches 237, for example of width of the order of 3 mm and length of the order of 10 to 20 mm. , which allow the supply of the nozzles 231 for introducing liquid and which are evenly distributed around the head T. By way of example, as shown in FIGS. 15, 16 and 19, the head T can comprise twelve nozzles 231 water injection regularly distributed at the periphery of the upper part of the separator device 203.

As in the other embodiments described, by vortex effect, the water freed of the largest particles in the detachable prefilter basket 202 or the grid constituted by the slots 237, but still loaded with particles of diameter less than or equal to a few millimeters , undergoes a vortex separation-settling in the chamber 230 of the separation-settling module 203 between the ceiling plate 233 and a lower header plate 250 (see FIG. 17) supporting a bottom plate 235 defining a central opening 215.

In the chamber 230, a first stream Q1 of solid particle laden liquid is formed at the periphery of the chamber 230 to escape down through openings 232 (Figure 17) at the inlet of which are arranged fins 225 (e.g. between eight and sixteen fins) or fin blades of a flow straightener 220. A second stream Q2 of liquid lightened in particles is formed in the central part of the chamber 230 and, according to the embodiment of Figures 15 to 20, is evacuated by an orifice 215 located at the lower central part of the chamber 230, to pass through radial channels 252 and discharge directly to the outlet of the filter device 204, in a space 255 located outside the filter bag 241,

As in the other embodiments, the second stream Q2 of lightened liquid particles passes through a flow control device consisting of a valve 217 applied to the orifice 215 by a spring 218 bearing on a valve cover 213 and calibrated so that the valve opens when the depression in the bowl 240 increases under the effect of the progressive clogging of the pocket 241. The cavity 251 formed below the lower outer face of the valve 217 is thus connected directly to the interior of the bowl 240 through the horizontal channels 252 and vertical 253 by short-circuiting the filter bag 241. The operation is similar to that already described in the context of previous embodiments. However, providing an evacuation of the liquid flow Q2 from the bottom of the chamber 230 rather than from the top, as in the case of the embodiments of Figures 5 and 9, allows for a more compact device.

In particular, since the evacuation of the stream Q2 liquid lightened particles is carried out at the bottom of the chamber 230, no flow transfer channel Q2 is required between the injection nozzles 231 located at the upper inlet of the chamber 230 and these nozzles 231 may be distributed over the entire periphery of the separation decantation device 203 (Figures 16 and 19) in contrast to the case of the previously described embodiments, in particular with reference to Figures 4 to 9.

The use of injection nozzles 231 distributed over 360 ° ensures a more efficient injection and a more homogeneous flow which improves the vortex quality in the chamber 230 with better separation of the particles.

The integration of the housing of the spring 218 of the valve 217 in the lower part inside the pocket 241 makes it possible to have in the upper part of a flat plate 233 without boss to receive a removable pre-filter basket 202. The flow rectifier 220 shown in FIG. 20, which is placed at the inlet of the collecting plate 250, comprises, around the annular plate 235 defining the central orifice 215, an assembly of, for example, eight to twenty-four fins or propeller blades 225 (e.g. sixteen blades) which are oriented to capture the particles by dynamic effect, including the lightest particles, by exploiting the gyratory movement of the liquid flow in the cavity 230; that is to say the spiral vortex movement of which part is directed towards the central orifice 215 of the open valve 217. The flow rectifier 220 with a peripheral annular portion concentric with the orifice 215 and comprising a set of blades of propeller 225 oriented relative to the gyratory movement of the fluid so as to each have a front edge 215A salient, is a kind of scraper and promotes the capture of the lightest particles.

Claims

A system for filtering the water of a swimming pool, comprising a device for withdrawing water from the pool loaded with solid particles at a suction mouth (E), a prefilter basket (2; 202), a device (10; 110) for pumping water withdrawn and returned to a discharge nozzle in the basin, and a filtering device (4; 104), characterized in that the filtration device (4; 104) comprises a filter element (41; 241) on which is placed a liquid introduction head (T), in that the liquid introduction head (T) incorporates a vortex separating device (3). having a chamber (30; 230) for creating a first flow (Ql) of liquid charged with solid particles discharging downwardly around the periphery of the chamber (30; 230) and a second stream (Q2) of liquid reduced in particles evacuated through an orifice (15; 215) located at the central part of the chamber (30; 230) through a device f (7; 107) flow control to the outlet of the filter device (4; 104).

2. System according to claim 1, characterized in that the vortex separating device (3) comprises between three and twelve nozzles (31; 231) tangentially introducing liquid regularly distributed around the periphery of the chamber (30; 230). .

3. System according to claim 2, characterized in that the chamber (30; 230) of the vortex separating device (3) is delimited by a smooth peripheral wall (34; 234) and a smooth ceiling (33; 233). .

4. System according to any one of claims 1 to 3, characterized in that the device (2; 107) flow control of the second flow (Q2) comprises a valve (17; 217) applied by a calibrated spring (18; 218) on the orifice (15; 215) located at the central part of the chamber (30; 230).

5. System according to any one of claims 1 to 4, characterized in that the orifice (15) for discharging the second stream (Q2) of liquid is located at the upper central portion of the chamber (30).

6. System according to any one of claims 1 to 4, characterized in that the orifice (215) for discharging the second stream (Q2) of liquid is located at the lower central portion of the chamber (230).

7. System according to any one of claims 1 to 6, characterized in that the filtering member (41; 241) comprises a bag of textile material disposed inside a sealed bowl (40; 240) provided with a strainer (5) and a lower orifice (46) for discharging the filtered water.

8. System according to claim 7 and any one of claims 4 to 6, characterized in that it comprises a cavity (51;

251) located on the side of the outer face of the valve (17) and directly connected by horizontal (52; 252) and vertical (53; 253) channels within the bowl (40; 240) but outside the the bag of textile material (41; 241).

9. System according to any one of claims 1 to 8, characterized in that the filtering device (4) is disposed on a pipe (9) for suction of the device (10) for pumping.

10. System according to any one of claims 1 to 8, characterized in that the filtration device (104) is disposed on a pipe (109) for discharging the device (10) for pumping.

11. System according to claim 5, characterized in that the liquid introduction head (T) is equipped with a flow rectifier (20) comprising guide vanes (24, 25) intended to create a central laminar flow. Vertical low velocity at the inlet of the filter member (41).

12. System according to claim 6, characterized in that the liquid introduction head (T) is equipped with a flow straightener. (220) disposed in the bottom of the chamber (230) of the vortex separating device (3) and comprising, in a peripheral annular portion concentric with the orifice (215) for discharging the second liquid flow (Q2), a propeller-blade-shaped fin assembly (225) oriented with respect to the gyratory movement of the fluid in the chamber (230) so as to each have a projecting leading edge (225A).

13. System according to any one of claims 1 to 12, characterized in that it comprises a pre-filter basket (2; 202) superimposed on the head (T) and comprising a bottom grid (22; 222) and a cylindrical side wall (23; 223) provided with a notch (21; 221) for introducing water.

14. A method of filtering water from a swimming pool comprising the steps of withdrawing water from the pool filled with solid particles at a suction mouth (E), prefiltering the particles largest solids, to pump the water taken to discharge it to a discharge nozzle in the basin, and to filter, using a filter element (41; 241), the water charged with solid particles before it is discharged into the pond, characterized in that it further comprises the step of vortexing a vortex flow with the charged water charged with particles so as to create a first flow (Ql) of liquid charged with solid particles evacuating in the peripheral portion from the bottom towards a flow rectifier (20; 220) and a second stream (Q2) of liquid lightened in particles evacuating in central part through a device (7; flow control directly to the l an outlet of the filter element (41; 241) without passing therethrough, so as to ensure a permanent flow of liquid to the discharge nozzle (R) even in case of clogging of the filter member (41; 241).

15. The method of claim 14, characterized in that it is further carried out a cleaning operation of the pool of the pool with a robot connected to the discharge nozzle continuously supplied filtered water or lightened in particles