Device for treating limescale present in drinking water

Abstract

Title: Device for treating limescale present in drinking water. The invention relates to a device (100) for treating limescale present in drinking water, comprising: a control unit (104), a flow meter (106), a CO2 injection module (108), a solenoid valve (110) actuated by the control unit (104) so ​​as to control: a CO2 injection frequency, indexed to said measured flow rate, and a CO2 injection duration, a mixing filter (112) comprising: at least one filter medium for filtering any particles present in the water, and at least one mixing element to improve the dilution of CO2 injected into the water, an electronic pH measuring probe (114), wherein the control unit (104) is provided to modify said injection frequency and / or said injection duration as a function of said measured pH and a pH value, said target pH, determined as a function of a pH of the water. previously measured without CO2 injection,said initial pH. The invention also relates to a method for treating limescale present in drinking water. Figure for the abstract: [Fig. 1],

Claims

Demands

1. A device (100; 400) for treating limescale present in drinking water, comprising: • a control unit (104; 402), • an electronic flow meter (106; 106) for measuring a flow rate in a drinking water pipe (102) and transmitting said measured flow rate to said control unit (104; 402), • a CO2 injection module (108; 108) for injecting CO2 into said water pipe downstream of said flow meter (106; 106), • a solenoid valve (110) for disposition between said injection module (108; 108) and a CO2 source, said solenoid valve (110) being actuable by the control unit (104; 402) so as to control: • a CO2 injection frequency, indexed to said measured flow rate, and / or • a CO2 injection duration, • a water filter, said mixer filter ( 112; 112; 112 ), intended to be disposed downstream of said injection module ( 108;108) of CO2 and comprising: • at least one filter medium to filter any particles present in the water, and • at least one mixing element to improve the dilution of CO2 injected into the water, • an electronic pH measuring probe (114; 114) to measure the pH of the water downstream of said mixing filter (112; 112; 112) and transmit said measurement to the control unit (104; 402), wherein the control unit (104; 402) is provided to modify said injection frequency and / or said injection duration as a function of said measured pH and a pH value, referred to as target pH, determined as a function of a previously measured water pH without CO2 injection, referred to as initial pH.;

2. Device (100;400) according to claim 1, characterized in that the target pH value is 0.4 to 0.6 lower than the initial pH value, preferably 0.5 lower.

3. Device (100;400) according to any one of the preceding claims, characterized in that the control unit (104;402): • increases the injection frequency and / or the duration of CO2 injection when the measured pH is lower than said target pH; and • reduces the injection frequency and / or the duration of CO2 injection when the measured pH is higher than said target pH.

4. Device (100;400) according to any one of the preceding claims, characterized in that an initial injection frequency is preconfigured in the control unit (104;402), the initial frequency being preconfigured so as to achieve a number of CO2 injections per liter of water between 8 and 12, preferably equal to 10.

5. Device (100;400) according to any one of the preceding claims, characterized in that at least one initial injection time is preconfigured in the control unit (104;402), said initial injection time being between 6 and HO milliseconds.

6. Device (100;400) according to the preceding claim, characterized in that a plurality of initial injection durations, each associated with a distinct pH value, are preconfigured in the control unit (104;402), in which one of said initial injection durations is chosen by the control unit (104;402) according to the associated pH value and the initial pH value.

7. Device (100;400) according to any one of the preceding claims, characterized in that the injection frequency is preconfigured in the control unit (104;402) as modifiable so as to achieve a number of CO2 injections per liter of water between 5 and 15.

8. Device (100;400) according to any one of the preceding claims, characterized in that the injection time is preconfigured in the control unit (104;402) as modifiable between 4 and 300 milliseconds.

9. Device (100;400) according to any one of the preceding claims, characterized in that the injection module (108;108) comprises a non-return means (206;206) for permitting the passage CO2 in one direction and prevent the passage of water in the opposite direction.

10. Device (100;400) according to any one of the preceding claims, characterized in that at least one mixing element is a helical mixing propeller (308) intended to be disposed in a cylindrical element of the mixing filter (112;112;112) through which potable water flows.

11. Device (100;400) according to the preceding claim, characterized in that at least one mixing element is a mixing helix (308) comprising a plurality of helical sections, each section being offset from the previous section by an angle between 45° and 135°, preferably between 80° and 100°.

12. A method for treating limescale present in drinking water, comprising at least one iteration of the following steps: • measurement by an electronic flow meter (106; 106) of a drinking water flow rate in a drinking water pipe (102), • transmission of said measured flow rate to a control unit (104; 402), • actuation by the control unit (104; 402) of a solenoid valve disposed between a CO2 source and a CO2 injection module (108; 108), said injection module (108; 108) being disposed on said pipe (102) downstream of the flow meter (106; 106) and upstream of a mixing filter (112; 112), said actuation controlling: • a CO2 injection frequency, indexed to said measured flow rate, and • a CO2 injection duration, • measurement of the pH by a probe (114; 114) pH measuring electronics disposed on said pipe downstream of said mixing filter (112;112;112), • transmission of said measured pH to one of the control units (104;402); and • modification, if necessary, of the frequency of CO2 injection and / or the duration of CO2 injection as a function of the measured pH and a pH value, called target pH, determined as a function of a previously measured water pH without CO2 injection, called initial pH.;

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