FR2612419A1 - Valve-free filter with automatic unblocking - Google Patents

Abstract

Device intended for filtering laden liquids with automatic unblocking. The liquid to be filtered is admitted under pressure into a lower storage vessel 4 comprising a bed of filter material 5; a pipe 6 ensures the flow of the filtered liquid into an upper storage vessel 7 integrally attached to a discharge pipe 8, 10 comprising a free air connection 9, 14. When the pump 2 is stopped, the liquid from the upper storage vessel 7 passes countercurrentwise through the bed of filter material 5 under the effect of a siphon between the discharge pipe 8, 10 and the entry pipe 1.

Description

AUTOMATIC CLEANING FILTER WITHOUT VALVE
The subject of the present invention is a method of filtering liquids loaded with solid matter, the decoiniation of which is done automatically at each stop of use.

 This unclogging is done by the effect of gravity and a flushing effect by siphoning, without the intervention of pumps, valves, or a device comprising motor or automation components as in traditional filters.

 The filter described in this patent consists of a cylindrical tank 4 surmounted by a second tank 7. The tank 4 is constructed like that of a ~ ordinary sand filter. The liquid to be filtered is admitted there through a pipe 1 and discharged by a pump 2 inside the compartment 4. A bed of sand 5 allows the actual filtration of the liquid to be treated.

 Under the effect of the pressure, the filter liquid can only leave this tank through the pipe 6, to be led to the second tank 7.

After filling this second tank, the filter liquid is discharged through line 8 and then 1 ~.

The separation g is an air vent which will not siphon the treated liquid parts which are downstream of the installation.

 As soon as the supply to the device is stopped, the liquid contained in the reservoir 7, by siphoning, will go back the opposite way, that is to say will cross again, but in the other direction, the pipe 6 then the filter bed 5 before being evacuated by means of the valve 12 and a pipe 11 to an outlet.

 It should be noted that this siphoning effect is possible thanks to the difference in level between the vent 9 and the discharge level of the pipe 11. Naturally the greater this difference in level and the more the siphoning will be doubled by a hunting effect, and the better the unclogging.

 The return of the portion of filtered liquid contained in the reservoir 7, through the sand bed, and upside down, allows, as in a traditional filter, the unclogging of the sand bed by ensuring the evacuation by entrainment, of the solid materials. that had been retained by the filter.

 The valve 12, shown in FIG. 11, is a ball valve and with a flap specially fitted out by replacing the inspection plug with a pipe, to allow the supply of the pipe 11 to be closed off during the supply of the filter and then, as soon as the shutdown of the filter supply, the evacuation of siphoned water to the outlet through the pipe 11 and the sealing of the pipe 1.

The invention is not limited to the embodiment described, in particular:
the device 12 can be omitted and the washing water allowed to return through the pump to a tank of water to be filtered.

 The filter can be supplied by any other means than by a pump, for example by pressurized water or from a water tower.

 One or more clocks or switches can be added to the device, favoring stopping the supply of the filter in order to increase the number of regenerations.

A pressure gauge can be added to the installation to interrupt the supply of the device as soon as the pressure due to clogging of the sand has reached a fixed value
A manual or automatic valve can be added to lines 3 or 11 in order to prevent automatic decolination at each stop of the filter aliinentaiton, for example so as not to systematically consume the water contained in the tank 7.

 Line ## 6 can be placed outside the device.

 The partition 9 can be replaced by a device 14 "vacuum breaker", commercial, allowing air to be introduced into the pipeline as soon as the pressure drops.

Claims (8)

R E V a X D I C A T I O N S  1. Filtration device for charged liquids comprising means for ensuring automatic filter decolinating, characterized in that it comprises two superimposed tanks <4.7> connected upstream to a supply pipe (1) for charged liquids, said pipe being associated with pressure delivery means <2>, and downstream with an evacuation pipe (8,1 ~) comprising an air vent <9), in that the lower tank contains a bed of filter material (5) and a pipe (6) which ensures the passage of the filtered liquids from the lower tank to the upper tank, the supply (1) and evacuation (8, 1 ~) pipes being arranged so as to present between they a difference in level.  2. Device according to claim î characterized in that on the supply pipe (1) is connected a discharge pipe (it> associated with a ball valve (12).  3. Device according to claim 1 or 2 characterized in that the pressure delivery means (2> is a pump.  4. Device according to any one of claims 1 to 3 characterized in that the filter material bed consists of sand.  5. Device according to any one of the preceding claims, characterized in that the pipe <e> for passage between the lower tank <4) and the upper tank <7> is external to said tanks.  6. Device according to any one of the preceding claims, characterized in that it comprises one or more clocks and / or switches delaying the stopping of the supply of the filter.  7. Device according to any one of the preceding claims, characterized in that it comprises a pressure gauge associated with a switch triggered when the pressure caused by the clogging of the filter reaches a predetermined value.  8. Device according to any one of the preceding claims, characterized in that between the pressure delivery means (2) and the lower tank <4) is arranged a valve, manual or automatic.