Fluid sprinkling – spraying – and diffusing – Electrostatic type
Patent
1989-11-16
1990-10-30
Kashnikow, Andres
Fluid sprinkling, spraying, and diffusing
Electrostatic type
239432, 2395905, 239706, B05B 5047
Patent
active
049663305
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
The present invention relates to an apparatus in a powder sprayer which comprises an annular, friction charging channel defined by an inner longitudinal body and an outer tubular body surrounding the inner body, there being disposed, in the flow path of the powder through the sprayer, at least one turbulator with turbulence members which are obliquely inclined or are helically configurated in relation to the longitudinal direction of the sprayer.
BACKGROUND ART
In such powder sprayers--or sprayguns--as are employed for painting and lacquering work, and as utilise electrostatic charging of the powder, attempts have been made, with a view to increasing the charging degree of the powder, to realise as good a turbulence and blending of the air-powder mixture as possible in the charging channel or channels employed in the powder spraygun. One method of achieving this has been to make the configuration of the channel proper irregular, spiral or of differing cross-section, so that turbulence will thereby be created. Examples of such constructions are disclosed in Swedish Patent Applications Nos. 7206316-7 and 8007919-7.
Another prior art method of increasing the turbulence and improving the charging degree in a powder spraygun with friction charging entails that a helicoid rotational movement is imparted to the powder at the same time as the powder runs through the charging channel in the gun. One example of such a construction is described in U.S. Pat. Ser. No. 4,359,192.
In summing up the prior art technology, it might be said that, given favourable conditions, it may very well be enough to provide sufficient charging of the powder. However, if the powder is not of a uniform or homogeneous nature, but consists of mixtures of different powder varieties or qualities, the prior art constructions do not function satisfactorily. In addition, problems have arisen in certain cases, in that the powder has received an uneven charge, such that certain particles in the powder flow have been greatly charged while others have been but moderately charged or not charged at all.
OBJECTS OF THE INVENTION
The present invention has for its object to realise an apparatus of the type disclosed by way of introduction, the apparatus being designed in such a manner that it generally improves the charging degree of the sprayed powder, even if the powder is not of a unitary nature, and also under otherwise unfavourable conditions. Hence, the present invention has for its object to design the apparatus disclosed by way of introduction in such a manner that sufficient turbulence is created in the powder flow, as this runs through a friction charging channel. The invention further has for its object to realise a more even charging of the powder and to attain such a design of the spraygun that the gun may be manufactured both simply and cheaply, that parts exposed to wear may readily be replaced and that the gun may easily be cleaned.
SOLUTION
The objects forming the basis of the present invention will be achieved if the apparatus disclosed by way of introduction is characterised in that at least two turbulators are disposed in the annular channel and that turbulence members in proximally located turbulators are offset in the circumferential direction in relation to one another.
In one preferred embodiment of the apparatus according to the present invention, the turbulators are disposed in groups of two or more in mutual sequence after one another.
According to the present invention, the turbulence members are suitably also in the form of vanes projecting out from the inner body, the outer portions of the vanes abutting against the inside of the tubular body, each turbulator including a plurality of vanes uniformly distributed about the inner body such that through flow channels are formed between the vanes.
As a result of these constructional features, there will be ensured an accurate centering of the inner body in the outer body such that, thereby, the annular charging channel will have the intended configuratio
REFERENCES:
patent: 4359192 (1982-11-01), Takahashi et al.
patent: 4659019 (1987-04-01), Talacko
patent: 4706890 (1987-11-01), Talacko
patent: 4798340 (1989-01-01), Vohringer et al.
AC Greiff Ytbehandling AB
Kashnikow Andres
Merritt Karen B.
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