Dispensing – With discharge assistant – Fluid pressure
Patent
1991-02-11
1993-03-09
Kashnikow, Andres
Dispensing
With discharge assistant
Fluid pressure
222401, 239113, 239351, B65D 8300
Patent
active
051920093
DESCRIPTION:
BRIEF SUMMARY
The invention is directed for the spraying of fluids comprising an air pump which can be driven electrically via a switch, a container for the fluid to be sprayed, and a nozzle whose air inlet opening is connected with the air pump via a compressed air duct.
The known devices for the spraying of fluids comprising an air pump and a nozzle are advantageously distinguished in that no propellant gas is required. However, compared with spray cans using propellant gas, they also have disadvantages which consist in that e.g. the pressure required for a fine spraying of the fluid must first be built up at the beginning of a spraying process by means of putting the air pump into operation. In so doing, the fluid, which at first does not exit in a finely atomized state, is troublesome. Further, there is a delay between the actuation of an operating control and the issuing of a usable spray stream. This delay is particularly troublesome when several consecutive bursts of spray are required within a relatively short time period, e.g. when styling hair.
In a known electropneumatically operated spray can system (DE 37 11 874 A1) it is provided that the air feed is first effected when pressing a button and the fluid feed is released to a venturi nozzle only at the end stop of the button. Due to the slight vacuum pressure, the spraying effect or atomization depends on the fluid state in the supply container and on the viscosity of the fluid.
It is the object of the present invention to provide a device of the generic type for the spraying of fluids which comprises the same characteristics with respect to application technology as an aerosol can filled with compressed gas. Moreover, the conventional form and handling, as desired, of an aerosol can filled with compressed gas is to be achieved.
This involves the following requirements: supply container. after-spraying.
Moreover, a drying up of residual fluid is prevented from leading to interferences in function (poor spraying, etc.).
This object is met, according to the invention, by providing a valve connecting the compressed air duct with the air space of the container, and comprising a control cylinder having three openings for connection with an air inlet opening and a fluid inlet opening of the nozzle and the container air space, and a piston displaceable in the cylinder.
The steps, according to the invention, ensure that fluid is only directed through the tangential ducts of the nozzle when there is a sufficiently high flow speed of air. Further, the fluid feed is effected during the entire spraying process with a substantially constant pressure. A fine atomization accordingly occurs immediately after actuation and persists during the entire spraying process.
Due to the closing of the connection between the air space of the container and the compressed air duct, no fluid can penetrate into the air compressor even when the device is in a horizontal or inverted position. The pressure built-up in the container during a spraying process is accordingly also stored over a longer period of time, so that when a spraying process is effected subsequently or when several successive spray bursts are effected, the air required at the time by the air compressor is not needed first for building up the required pressure within the container.
According to a further development of the invention, it is provided that the valve is constructed as a multiple-way valve and that after the duct is closed, another duct is opened between the compressed air duct and the fluid inlet openings of the nozzle.
As a result of this development, the nozzle, particularly the tangential ducts, is blown free after every spraying process. Closing of the tangential ducts by dried up fluid residues is accordingly prevented, so that there can be no impairment to the functioning of the nozzle.
An advantageous construction of the device, according to the invention, consists in that the control piston is arranged so as to be axially movable in the control cylinder whose diameter is greater than the diameter of the
REFERENCES:
patent: 4046289 (1977-09-01), Teranishi
patent: 4222525 (1980-09-01), Hildebrandt
patent: 4972977 (1990-11-01), Fuhrig
patent: 5046667 (1991-09-01), Fuhrig
Hildebrandt Bodo
Mattinger Detlef
Trinkaus Karl
Derakshani Philippe
Kashnikow Andres
Striker Michael J.
Wella Aktiengesellschaft
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