Ozone-based disinfecting device comprising a flow sensor
An ozone-based disinfecting device is provided comprising a mixer having a generally hollow body with a water inlet for water under pressure, a spray nozzle for generating a generally conical spray of water introduced by way of the water inlet, a contact chamber communicating with a gas inlet for ozone rich gases, and an outlet aperture from the contact chamber that is coaxial with the spray nozzle and spaced apart therefrom. An electronic flow sensing device senses the extent of the flow of water through the spray nozzle according to vibration caused by water flowing through the mixer. The electronic flow sensing device is preferably located in a pocket formed in the mixer and preferably comprises a piezoelectric sensor embedded at least around its periphery in a settable material. A preferred construction of the mixer is also described.
1. An ozone-based disinfecting device comprising a mixer having a generally hollow body with a water inlet for water under pressure; a spray nozzle for generating a generally conical spray of water introduced by way of the water inlet; a contact chamber communicating with a gas inlet for ozone rich gases; an outlet aperture from the contact chamber with the outlet aperture being coaxial with the spray nozzle and spaced apart therefrom, and a flow sensing device for sensing the extent of flow of water through the spray nozzle, wherein the flow sensing device is an electronic flow sensing device for sensing vibration caused by a flow of water through the mixer and comprises a piezoelectric sensor and an appropriate associated circuit for generating a signal indicative of the rate of flow of water through the mixer, wherein the piezoelectric sensor is embedded in a settable material and has the general shape of a disc that has a thin smaller diameter compressible disc adhered concentrically to both surfaces of the sensor disc with the outer diameter of the piezoelectric sensor firmly embedded in the settable material and wherein a small hole in the center of one disc provides for the settable material to contact the piezoelectric sensor in the central region on the one side thereof.
2. An ozone-based disinfecting device as claimed in claim 1 in which the electronic flow sensing device is located in a pocket provided in the mixer body.
3. An ozone-based disinfecting device as claimed in claim 1 in which the associated circuit is carried on a printed circuit board housed within the mixer body.
4. An ozone-based disinfecting device as claimed in claim 3 in which the printed circuit board is housed in a pocket in the mixer body.
5. An ozone-based disinfecting device as claimed in claim 1 in which the flow sensing device and an associated circuit is arranged to activate and deactivate an ozone generator operatively connected to the gas inlet for ozone rich gases.
6. An ozone-based disinfecting device as claimed in claim 1 in which a signal outputted by the flow sensing device and associated circuit operatively activates and deactivates a fan supplying air to the ozone generator with activation of the fan being effected before activation of the ozone generator takes place and deactivation of the fan being effected after deactivation of the ozone generator takes place.
7. An ozone-based disinfecting device as claimed in claim 6 in which the fan is capable of running at different speeds dependent on the flow rate of water through the spray nozzle.
8. An ozone-based disinfecting device as claimed in claim 1 in which the diameter of the outlet aperture corresponds substantially to the diameter of the conical spray at that position so that substantially no free space exists between the outside of the conical spray and the periphery of the outlet, in use.
9. An ozone-based disinfecting device as claimed in claim 1 in which the contact chamber itself has a larger cross-sectional size than the diameter of the outlet aperture.
10. An ozone-based disinfecting device as claimed in claim 1 in which the gas inlet for ozone rich gases has an axis parallel to, but laterally offset from, that of the water inlet with a gas inlet chamber merging laterally with the contact chamber.
11. An ozone-based disinfecting device as claimed in claim 1 in which the mixer body is composed of a first part in the form of a shroud defining the outlet aperture that receives, in an open end opposite the outlet aperture, a second part defining the water inlet, gas inlet and a pocket for receiving the electronic flow sensing device for sensing the extent of flow of water through the spray nozzle with the second part of the body being received in the open end of the shroud part of the body.
12. An ozone-based disinfecting device as claimed in claim 1 in which the water inlet is configured as a screw threaded socket for application directly to a complementarily screw threaded spout of a tap or other tubular water dispensing item.