Dispensing – With discharge assistant – Fluid pressure
Patent
1992-11-13
1994-05-24
Shaver, Kevin P.
Dispensing
With discharge assistant
Fluid pressure
366244, B65D 8300
Patent
active
053140966
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
The invention relates to a pressure vessel for spraying a liquid comprising a piston pump arranged in the interior of the pressure vessel and actuatable from the outside by piston strokes for building up an increased pressure in the interior of the vessel and having a pump cylinder mounted on the vessel and projecting into the interior of the vessel.
Such pressure vessels are known from European published patent application 268 921 A2, German published patent application 34 08 015 and German utility model 23 20 572.
These pressure vessels serve, for example, to spray a decontamination liquid, and the pressure required for the spraying is generated in the pressure vessels on the spot by actuating the piston pump.
Mixtures of different liquids which are produced before the spraying, for example, in the form of emulsions are often also sprayed with such pressure vessels. With known pressure vessels of this kind, it is standard practice to open these and in the open state to mix the liquids in the desired manner with one another with the aid of a separate stirring tool and, in the given case, produce the emulsion. The pressure vessel is then closed and brought to the internal pressure required for the spraying by actuating the piston pump.
This is a complicated procedure; also when aggressive liquids are used, there is the danger that these liquids will escape from the vessel into the environment during the mixing operation. The object of the invention is to so improve a generic pressure vessel that the mixture required for the spraying can be produced in a simple way and the pressure required for the spraying can be generated subsequently.
SUMMARY OF THE INVENTION
This object is accomplished in accordance with the invention in a pressure vessel of the kind described at the beginning by the piston pump being mounted on the vessel for rotation about its longitudinal axis, by a drive means for rotating the pump cylinder being arranged on the outside of the vessel, and by the pump cylinder taking along with it as it rotates mixing elements which project into the liquid. The entire pump is thus additionally used as a drive means for mixing elements with which the necessary mixing is carried out in the interior of the closed vessel by rotation of the pump.
It is particularly advantageous for the drive means to be a hand crank; in other cases, however, the driving could also be effected with the aid of a mounted electric motor or via a driving belt coupled with a belt pulley.
If a hand crank is used, it is expedient for it to be simultaneously designed as pump handle so that the same handle can be used to bring about both the rotation for the mixing and the pumping movement for generating the spraying pressure.
In a first preferred embodiment, provision is made for the pump cylinder itself to carry the mixing elements. This results in a particularly simple design.
For example, the pump cylinder according to a preferred embodiment may carry essentially radially protruding mixing blades which extend around it in helical configuration. These helical mixing blades convey liquid from the bottom of the pressure vessel upwards so that it is ensured that chemicals collecting at the bottom of the vessel are uniformly mixed in with the rest of the liquid and when the vessel is emptied at the bottom, a homogeneous mixture is discharged and not liquid which without these mixing blades would collect at the bottom of the vessel.
This effect can be further improved by ring-shaped mixing elements being held on the pump cylinder concentrically with the axis of rotation thereof at the bottom end.
It is also particularly advantageous that mixing can also be carried out when the vessel is under pressure as the rotary bushing for the pump cylinder has, of course, to be of pressure-tight design. Therefore, even after a short interruption in the spraying, it is possible for mixing to be carried out briefly again prior to the next spraying cycle in order to ensure that a homogeneous mixture is sprayed.
While
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Fesl Robert
Janssen Peter
Stelzmuller Helmut
Alfred Karcher GmbH & Co.
Lipsitz Barry R.
Shaver Kevin P.
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