Fluid sprinkling – spraying – and diffusing – With means to vibrate or jiggle discharge – By electric transducer
Patent
1990-10-12
1993-03-16
Kashnikow, Andres
Fluid sprinkling, spraying, and diffusing
With means to vibrate or jiggle discharge
By electric transducer
137554, 12820023, B05B 108, A61M 1100
Patent
active
051937450
DESCRIPTION:
BRIEF SUMMARY
The present invention relates to the technical field of atomizing a fluid, such as a liquid. The present invention more specifically relates to an atomizing nozzle device for atomizing a fluid supplied thereto. The fluid may constitute a liquid or a gas, which is supplied to the atomizing nozzle device at an elevated pressure as compared to the atmospheric pressure or any other pressure prevailing in an environment, in which the atomizing nozzle device is operated. The elevated pressure may for most applications constitute a superatmospheric pressure for most applications less than 10 ato. The fluid to be atomized by means of the atomizing nozzle device may as indicated above, constitute a gas or a liquid. The liquid may be e.g. water or an aqueous solution to be discharged or injected, e.g. in a fire extinguishing system or the like, or may be a combustible liquid such as petrol, gasoline, diesel or any other combustible gas injected into a combustion chamber, e.g. a combustion chamber of a combustion engine. A particular application of the present invention is within the therapeutical field, according to which application, an inhaler is provided comprising an atomizing nozzle device for atomizing the fluid or liquid comprising a drug to be inhaled by a patient.
In numerous references, the technique of injecting a liquid into e.g. a combustion chamber or into a gaseous medium is described. Reference is made to U.S. Pat. Nos. 4.313,571, 3,884,417, 4,000,852, 4,033,507, 4,166,577, 4,398,670. 4,726,523 and 4,739,929, which references are herewith incorporated in the present specification by reference. Numerous of these references describe pressure controlled injection valves or nozzles in which the discharging and atomizing of the fluid, such as the combustible fluid which is supplied to the valve, is controlled by the pressure of the fluid supplied to the valve or nozzle. These pressure controlled atomizing nozzles have been refined and have even been elaborated by providing a feedback signal indicating whether the fuel is discharged from the valve or not.
Thus, U.S. Pat. No. 4,398,670 discloses a fuel injection valve for an internal combustion engine, in which valve a set of contact elements for generating an on/off signal representing the on/off states of the valve is provided. Still, this known fuel injection valve is an atomizing nozzle device, the operation of which is totally controlled by the input pressure of the fuel supplied to the valve and the discharge of the fuel from which is controlled by the input pressure.
In an article in Industrial and Engineering Chemistry. Vol. 42. No 11, pages 2353-2358, Nov. 1950 by C. M. Sliepcevich. J. A. Consiglio and Fred Kurata, University of Michigan, Ann Arbor, Mich., Operating Characteristics of a Vibrating-Type Atomizing Nozzle, the vibrating-type atomizing nozzle in discussed in greater detail. In the article, the vibrating-type atomizing nozzle is compared to a "conventional" atomizing nozzle, i.e. a nozzle comprising a simple orifice, from which the liquid is discharged. It is evident from the article that a vibrating-type atomizing nozzle is capable of generating a far more refined jet of droplets and droplets of a smaller diameter than an atomizing nozzle, in which the atomizing is simply carried out by means of a discharge orifice.
An object of the present invention is to provide an improved vibrating-type atomizing nozzle, which renders it possible to provide a jet of extremely small droplets, i.e. droplets of a diameter of 0.5.varies.5 .mu.m, which atomizing nozzle device further renders it possible to control the discharging of the fluid from the atomizing nozzle device as pulsed, discharged jets with a substantially constant diameter of the droplets irrespective of the pressure of the fluid supplied to the atomizing nozzle device.
A further object of the present invention is to provide an atomizing nozzle device, the discharge of fluid from which is independent to any substantial extent of any fluctuations in the pressure prevailing in the fluid su
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"Operating Characteristics of a Vibrating-Type Atomizing Nozzle" by Sliepcevich, Consiglio & Kurata.
Kashnikow Andres
Morris Lesley D.
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