Metered and active sprayer devices with aerosol functionality (“Flairosol II”)
In exemplary embodiments of the present invention, “Flairosol” dispensing devices can be provided. Such devices utilize a combination of Flair® technology, pre-compression valves and aerosol-like pressurization of the dispensed liquid. Such a dispensing device has, for example, a main body comprising a pressure chamber, the latter being provided with a pressure piston and a pressure spring. The device further has a piston and a piston chamber which draws liquid from a container, for example, the inner container of a Flair® bottle, and fills the pressure chamber with that liquid as a user operates a trigger in various compression and release strokes. The piston chamber has both an inlet valve and an outlet valve, which serve to prevent backflow. Liquid exiting the piston chamber under pressure (supplied by a user pumping the trigger) enters a central vertical channel which is in fluid communication with both the pressure chamber (above the pressure piston) and a dome valve provided near the outlet channel at the top of the dispensing head. The dome valve has a preset pressure, such that once exceeded by the liquid, opens and allows for a spray. If the liquid pressure drops below such preset pressure, the dome valve closes off the outlet channel, which serves to regulate the strength of the flow and preclude leakage. Alternatively, in an activated embodiment, for example, once the liquid is sufficiently pressurized, it can be dispensed by a user allowing the dome valve to open by pressing on an activation button that removes a dome lock.
1. A method of spraying a liquid, comprising:
providing a dispensing head coupled to a container, the container including an inner container surrounded by an outer container, the dispensing head including an outlet channel and an outlet valve;
providing a pressure chamber within the dispensing head, the pressure chamber extending into the inner container and coupled to the outlet channel;
providing a piston within a piston chamber, an intake of the piston chamber coupled to the inner container, and an outflow of the piston chamber coupled to the pressure chamber;
pressurizing the liquid in the outlet channel above a pre-defined minimum pressure by moving the piston within the piston chamber through one or more release and compression strokes to respectively draw a liquid from the inner container into the piston chamber and expel the liquid from the piston chamber into the pressure chamber;
and
opening the outlet valve and spraying the liquid when the liquid in the outlet channel is pressurized above a pre-defined opening pressure of the outlet valve.
2. The method of claim 1 , further comprising providing a displacement medium between the inner container and the outer container, and providing a space between an outer surface of the inner container and an inner surface of the outer container is open to atmospheric pressure.
3. The method of claim 2 , wherein a volume of the piston chamber is greater than a volume of the pressure chamber.
4. A method of spraying a liquid, comprising:
providing a dispensing head coupled to a container, the container including an inner container surrounded by an outer container, the dispensing head including an outlet channel and an outlet valve, the outlet valve biased closed by an outlet valve lock:
providing a pressure chamber within the dispensing head, the pressure chamber extending into the inner container and coupled to the outlet channel;
providing a piston within a piston chamber, an intake of the piston chamber coupled to the inner container, and an outflow of the piston chamber coupled to the pressure chamber;
pressurizing the liquid in the outlet channel above a pre-defined minimum pressure by moving the piston within the piston chamber through one or more release and compression strokes to respectively draw a liquid from the inner container into the piston chamber and expel the liquid from the piston chamber into the pressure chamber;
manually releasing the outlet valve lock so as to allow the outlet valve to open;
and
spraying the liquid when the liquid in the outlet channel is pressurized above a pre-defined opening pressure of the outlet valve.
5. The method of claim 4 , further comprising providing a displacement medium between the inner container and the outer container, wherein said displacement medium is air, and providing a space between an outer surface of the inner container and an inner surface of the outer container is open to atmospheric pressure.
6. The method of claim 5 , wherein one of: (i) a volume of the piston chamber is smaller than a volume of the pressure chamber, and (ii) the volume of the piston chamber is smaller than the volume of the pressure chamber by a factor of 2-5 such that a spray of a preset time duration can occur.
7. The method of claim 1 , wherein a volume of the piston chamber is greater than a volume of the pressure chamber by a factor of between 1.5 and 3.
8. The method of claim 1 , further comprising providing a pressure piston and a pressure spring in the pressure chamber.
9. The method of claim 8 , further comprising isolating the pressure spring by means of seals to prevent contact between the pressure spring and any liquid in either the pressure chamber or the inner container.
10. The method of claim 1 , further comprising providing the outflow of the piston chamber with an outlet valve, a first side of the outlet valve subjected to a pressure in the piston chamber, and a second, opposite side of the outlet valve subjected to a liquid pressure in the pressure chamber.
11. The method of claim 4 , further comprising providing a pressure piston and a pressure spring in the pressure chamber.
12. The method of claim 11 , further comprising isolating the pressure spring by means of seals to prevent contact between the pressure spring and any liquid in either the pressure chamber or the inner container.
13. The method of claim 4 , further comprising providing the outflow of the piston chamber with an outlet valve, a first side of the outlet valve subjected to a pressure in the piston chamber, and a second, opposite side of the outlet valve subjected to a liquid pressure in the pressure chamber.
14. A method of spraying a liquid, comprising:
providing a dispensing head coupled to a container, the container including an inner container surrounded by an outer container, the dispensing head including an outlet channel and an outlet valve;
providing a pressure chamber within the dispensing head, the pressure chamber extending into the inner container and coupled to the outlet channel;
providing a piston within a piston chamber, an intake of the piston chamber coupled to the inner container, and an outflow of the piston chamber coupled to the pressure chamber;
pressurizing the liquid in the outlet channel above a pre-defined minimum pressure by moving the piston within the piston chamber through one or more release and compression strokes to respectively draw a liquid from the inner container into the piston chamber and expel the liquid from the piston chamber into the pressure chamber;
and
opening the outlet valve and spraying the liquid when the liquid in the outlet channel is pressurized above a pre-defined opening pressure of the outlet valve,
wherein a volume of the piston chamber is greater than a volume of the pressure chamber.
15. The method of claim 1 , wherein a volume of the piston chamber is one of:
smaller than a volume of the pressure chamber; or
smaller than a volume of the pressure chamber by a factor of 2 or 3.
16. The method of claim 4 , wherein a volume of the piston chamber is greater than a volume of the pressure chamber.
17. The method of claim 4 , wherein a volume of the piston chamber is one of:
smaller than a volume of the pressure chamber; or
smaller than a volume of the pressure chamber by a factor of 2 or 3.
18. The method of claim 1 , wherein the pressure chamber is provided with a pressure chamber spring, and wherein the volume of the pressure chamber is a function of the force constant of the pressure chamber spring.
19. The method of claim 4 , wherein the pressure chamber is provided with a pressure chamber spring, and wherein the volume of the pressure chamber is a function of the force constant of the pressure chamber spring.