Fluid sprinkling – spraying – and diffusing – Including supply holder for material – Fluid pressure discharge means
Patent
1996-04-10
1998-06-23
Kashnikow, Andres
Fluid sprinkling, spraying, and diffusing
Including supply holder for material
Fluid pressure discharge means
239463, 239490, 239602, 222333, A62C 1100
Patent
active
057693250
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
The present invention relates to a spray nozzle, and to a sprayer including such a nozzle.
Miniaturized sprayers for fluids (liquids or semi-liquids) such as perfumes, cosmetics, or pharmaceuticals, generally comprise a member for controlling emission of the fluid substance (a pump or a valve) that is connected via an outlet duct to a spray nozzle which atomizes the fluid substance into very fine droplets having a diameter of a few tens of microns.
In such sprayers, a known problem is to avoid the fluid drying or oxidizing in the outlet duct between two uses, and also to avoid the fluid seeping out from the spray nozzle between two uses. Document FR-A-2 635 084 teaches solving that problem by using a valve member which closes the outlet duct.
Also, the spray nozzle disclosed in document FR-A-2 635 084 includes, as do many spray nozzles, a swirling chamber closed by an end wall and filled in part by a core. The end wall includes an outlet orifice and non-radial internal grooves converging towards the outlet orifice. The core disposed inside the swirling chamber is generally substantially in contact with the end wall so that the fluid emitted under pressure is constrained to follow the non-radial grooves prior to reaching the outlet orifice. Because of the small section of the grooves, the fluid substance is highly accelerated, and in addition the orientation of the grooves imparts swirling motion thereto such that the fluid is very finely divided when it reaches the outlet orifice.
However, a small gap may remain between the core and the end wall of the swirling chamber, such that the fluid does not pass along the grooves, thereby degrading the quality of the spray. The gap may be due to manufacturing tolerances, to creep of parts made of plastics material, etc.
From documents EP-A-0 117 898 and U.S. Pat. No. 4,273,290, it is known to isolate such grooves by members comprising a valve disk which co-operates with a surface to form an outlet valve and a disk to isolate the grooves at the outlet of the nozzle. The two disks are interconnected by an S-shaped spring which enables the valve disk to move away from its seat under the effect of fluid pressure. Those members thus comprise three distinct elements, namely two disks and one spring, even if the member in document 02 is molded as a single part.
However, the cores disclosed in those documents suffer from the drawback of being difficult to mold because of their geometrical complexity. Also, they leave a large dead volume inside the chamber, thereby leading to the fluid which stagnates therein being spoiled.
SUMMARY OF THE INVENTION
An object of the present invention is to remedy that drawback.
The present invention thus provides a nozzle for spraying a fluid, the nozzle comprising an outlet duct suitable for receiving said fluid and opening out into a distribution chamber in the center of an annular surface, said chamber being closed by an end wall which is pierced by an outlet orifice and which includes an inside face provided with grooves in communication with the outlet orifice, said chamber being partially filled by a core which extends axially between a front face close to the end wall and a rear face remote from the end wall, the core leaving empty at least one lateral passage putting the grooves into communication with the outlet duct, the spray nozzle also comprising a valve adapted to close the outlet duct except during periods when said fluid is being sprayed, and to open under the effect of fluid arriving in the outlet duct, the core co-operating with the annular surface to constitute said valve, said rear face of the core being adapted to bear with sealed contact against said annular surface, the nozzle being characterized in that the core is a substantially circularly cylindrical elastomer part which is resiliently compressed between the end wall of the distribution chamber and said annular surface.
Preferably, the grooves are oriented in non-radial manner relative to the outlet orifice, said front face of the co
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de Pous Olivier
Jouillat Claude
Douglas Lisa Ann
Kashnikow Andres
Valois S.A.
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