Method and device for monitoring the flow of a liquid

1. A method for monitoring the flow of a liquid and operation of an electronic device borne by a unit equipped with a turbine that is capable of being driven to rotate by a stream of a fluid and a means for detecting at least one determined angular position of said turbine and delivering an electric pulse each time the turbine passes through this angular position, comprising:

incrementing an electric pulse counter each time the detection means delivers an electric pulse;

setting, on the basis of an original value, value thresholds for the number of pulses;

selectively activating a warning means for delivering various warning signals when the numbers of pulses delivered by the pulse counter are located within value ranges determined by said value thresholds; and

resetting the pulse counter to said original value at the end of a predetermined period if the value of the number of pulses delivered by the pulse counter remained the same throughout this period.

2. The method as claimed in claim 1 , comprising:

calculating, in real time, the frequency of said pulses; and

supplying the warning means with electrical power depending on this calculated frequency.

3. The method as claimed in claim 1 , wherein said warning means is supplied with electrical power depending on the speed of rotation of said turbine.

4. The method as claimed in claim 1 , wherein an electric current generator is connected to an electrical energy accumulator via a shared power supply point for the purpose of supplying electrical power, wherein the electronic device comprises at least a first group of circuits and a second group of circuits, the method comprising:

detecting, in real time, the value of the speed of rotation of the turbine;

supplying, via said shared point, the first group of circuits and the second group of circuits with electrical power if the value of the speed of rotation is higher than or equal to a speed threshold;

supplying, via said shared point, only said first group of circuits with electrical power if the value of the speed of rotation is lower than said speed threshold.

5. A method for monitoring the flow of a liquid and operation of an electronic device borne by a unit equipped with a turbine that is capable of being driven to rotate by a stream of a fluid, with an electric current generator driven to rotate by said turbine and with an electrical energy accumulator connected to the current generator via a shared power supply point for the purpose of supplying the electronic device with electrical power and which comprises at least a first group of circuits and a second group of circuits, comprising:

delivering electric pulses as the turbine rotates;

detecting, in real time, the speed of rotation of the turbine depending on the delivered pulses;

calculating the flow rate and/or the flowed volume of the fluid depending on the detected speed;

activating a warning means depending on the calculated value of the flow rate and/or the flowed volume;

supplying, via said shared point, the first group of circuits and the second group of circuits, which comprises the warning means, with electrical power if the value of the speed of rotation is higher than or equal to a rotational speed threshold;

supplying, via said shared point, only said first group of circuits with electrical power if the value of the speed of rotation is lower than said rotational speed threshold.

6. The method as claimed in claim 5 , wherein the current generator delivers an alternating current, said electric pulses being delivered each time the value of this current crosses a threshold.

7. A unit for monitoring the flow of a liquid, comprising a hollow body having an input and an output of the fluid, and equipped with:

a turbine placed in said body and capable of being driven to rotate by the stream of the fluid;

a current generator rotatably connected to said turbine; and

an electronic device supplied with electrical power by said current generator and comprising:

a means for detecting at least one determined angular position of said turbine, in order to deliver an electric pulse each time the turbine passes through this angular position;

a pulse counter for counting the successive pulses delivered by said detection means;

a means for fixing value thresholds for the number of pulses;

a comparison means for comparing the number of pulses delivered by the pulse counter to said thresholds and selectively delivering various control signals when the numbers of pulses delivered by the pulse counter are located within value ranges determined by said value thresholds; and

a warning means selectively delivering various warning signals corresponding, respectively, to said various control signals;

wherein the electronic device comprises a means for resetting the pulse counter to an original value at the end of a predetermined period when the value of the number of pulses remains the same throughout this period.

8. The unit as claimed in claim 7 , wherein the electronic device comprises a means for detecting the speed of rotation of the turbine and a means for supplying the warning means with electrical power depending on this speed of rotation.

9. The unit as claimed in claim 7 , comprising an electrical energy accumulator connected to the current generator and capable of at least partially supplying the electronic device with power.

10. The unit as claimed in claim 7 , wherein the current generator is connected to an electrical energy accumulator via a shared power supply point and wherein the electronic device comprises a first group of circuits and a second group of circuits; the first group of circuits being directly connected to said shared power supply point, the second group being connected to said shared power supply point via a switch that is controlled by a detector for detecting the speed of rotation of the turbine so as to supply the second group of circuits with power only if the speed of rotation of the turbine is higher than a rotational speed threshold.

11. The unit as claimed in claim 7 , comprising a means for displaying values output by the pulse counter.

12. The unit as claimed in claim 7 , comprising a watertight box that is installed inside said hollow body, which bears said turbine and in which the electronic device and the stator of the current generator are placed, the rotor of the current generator being borne by said turbine.

13. A unit for monitoring the flow of a liquid, comprising a hollow body having an input and an output of the fluid, and equipped with:

a turbine placed in said body and capable of being driven to rotate by the stream of the fluid;

a current generator rotatably connected to said turbine;

an electrical energy accumulator connected to the current generator via a shared power supply point; and

an electronic device comprising a first group of circuits and a second group of circuits, the first group of circuits being directly connected to said shared power supply point, the second group being connected to said shared power supply point via a switch that is controlled by a detector for detecting the speed of rotation of said turbine so as to supply the second group of circuits with power only if the speed of rotation of said turbine is higher than a rotational speed threshold.

14. The unit as claimed in claim 13 , wherein the electronic device comprises:

a means for detecting at least one determined angular position of said turbine, in order to deliver an electric pulse each time the turbine passes through this angular position;

a pulse counter for counting the successive pulses delivered by said detection means; and

a calculation means connected to said detection means, for calculating, in real time, the frequency of said pulses, corresponding to the speed of rotation of the turbine.

15. The unit as claimed in claim 13 , wherein the electronic device comprises:

a means for fixing value thresholds for the number of pulses;

a comparison means for comparing the number of pulses delivered by the pulse counter to said thresholds and selectively delivering various control signals when the numbers of pulses delivered by the pulse counter are located within value ranges determined by said value thresholds; and

a warning means selectively delivering various warning signals corresponding, respectively, to said various control signals.

16. The unit as claimed in claim 13 , wherein the electronic device comprises a means for displaying values output by the pulse counter.

17. The unit as claimed in claim 7 , wherein the current generator delivers an alternating current, the unit comprising a means for delivering electric pulses each time the value of this current crosses a threshold.

18. The unit as claimed in claim 7 , wherein said hollow body is a shower head.

19. The method as claimed in claim 4 , wherein the electric current generator delivers an alternating current, said pulses being delivered each time the value of this current crosses a threshold.