Agitating – Having interrelated feed and discharge means – Recirculating from and to mixing chamber
Reexamination Certificate
2000-06-01
2001-09-18
Soohoo, Tony G. (Department: 1723)
Agitating
Having interrelated feed and discharge means
Recirculating from and to mixing chamber
C366S167100, C366S191000
Reexamination Certificate
active
06290385
ABSTRACT:
TECHNICAL FIELD OF THE INVENTION
This invention relates to a device for the homogenization of a liquid which is stored in and may be drawn off a container, including a pump and three conduits connected thereto, a first one of which includes a first pipe possible to stick down vertically in the container, which pipe is arranged inside a coarser, second pipe included in the second conduit and protrudes with an end portion therefrom, a ring-shaped gap being provided between the outside of the first pipe and the inside of the second pipe, and the first conduit having the purpose of evacuating liquid from the container, the second conduit of returning liquid via said gap to the container for the purpose of homogenizing the liquid in the container, while the third conduit has the purpose of leading homogenized liquid to a tapping site, a distributing member being arranged on the projecting end portion of the first pipe.
PRIOR ART
Storage of liquids such as paints is, in practice, carried out in barrels, which may hold 200 litres. In such paints that contain pigments, the problem may arise, in particular after longer periods of storage, that the pigments sink to the bottom of the barrel. When the paint is to be used, e.g. in connection with spray painting or spray finishing, it is of vital importance that the paint is homogeneous, i.e. that the pigments and other component parts in the paint are completely and uniformly mixed with each other. Otherwise, the paint properties, such as colour, surface smoothness, coating properties, dripping tendency and the like, may deviate from what is desirable.
In order to homogenize paint before use, different techniques have previously been used, such as stirring by means of mechanical mixers, e.g. propeller mixers or helix mixers, which are stuck down into the barrel. Common for these techniques is, however, that they only bring about homogenization of the paint. This means that the subsequent discharge has to take place by means of a separate device, e.g. a pump with a suction pipe. In other words, two different devices have to be applied in the barrel. This handling gives rise to wastage and a generally smear working environment.
In order to overcome the above problem, a device of the initially mentioned type has been disclosed in SE 9701446-8, which can homogenize the paint and draw off the same without the need of removing the device from the storage container in question between these two operations. In this known device, on the free end portion of the paint or liquid evacuation pipe, a distributing member is arranged in the shape of a simple plate which extends perpendicularly to the pipe and may be adjusted on different levels in relation thereto. However, this distributing member has turned out to have a mediocre effect in respect of the ability thereof to distribute return liquid uniformly in the entire volume of the stored liquid. A special problem is based on the fact that the refill and drawing hole of conventional paint barrels has a limited diameter (approx. 80 mm), which means that a stiff distributing plate may be produced with only a very moderate, maximum diameter.
OBJECTS AND FEATURES OF THE INVENTION
The present invention aims at obviating the above-mentioned inconveniences of the homogenization device known from SE 9701446-8 and at providing an improved device. Therefore, a primary object of the invention is to provide a homogenization device the distributing member of which may distribute, in an effective way, arriving return liquid in the liquid volume positioned in the storage container in question. This should furthermore be able to take place in all essentials independently of the level for or the volume of the liquid quantity positioned in the container. Another object is to provide a device the distributing member of which can act effectively without having a large diameter.
According to the invention, at least the primary object is attained by the features defined in the characterizing clause of claim
1
. Preferred embodiments of the invention are furthermore defined in the dependent claims.
REFERENCES:
patent: 1003905 (1911-09-01), Hill
patent: 3421738 (1969-01-01), Dulger
patent: 4347004 (1982-08-01), Platts
patent: 4744959 (1988-05-01), Punzar et al.
patent: 5083686 (1992-01-01), Cady et al.
patent: 5431494 (1995-07-01), Ishii et al.
Ecco Finishing AB
Soohoo Tony G.
Young & Thompson
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