Fluid sprinkling – spraying – and diffusing – Electrostatic type – With fluid entrainment
Patent
1985-10-23
1986-07-01
Peters, Jr., Joseph F.
Fluid sprinkling, spraying, and diffusing
Electrostatic type
With fluid entrainment
B05B 502
Patent
active
045975345
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
The present invention relates to a powder sprayer with the ability to charge electrostatically, consisting of a plurality of elongated, curved charging ducts made of an electrically non-conducting material such as a plastic material, for example, which are coated with an electrically conducting layer over part of their length, wherein the coating layer can be connected to a lead extending therefrom and intended to be connected to earth or to a voltage source, so that when the spray is being used the powder material is charged by close contact with the internal walls of the ducts as it passes through the charging ducts.
The main aim of the present invention is to provide a powder sprayer of the above-mentioned type which, in addition to functioning faultlessly and charging the powder effectively, is also compact, due to the fact that it enables charging ducts of considerable length to be disposed in a small space.
SUMMARY OF THE INVENTION
The aim is achieved with a powder sprayer according to the present invention which is primarily characterised in that the ducts are curved to form at least one loop and/or a curve with its longitudinal central plane extending substantially in the supply direction of the powder.
BRIEF DESCRIPTION OF THE DRAWINGS
The invention is described in the following with reference to the accompanying drawings, on which
FIG. 1 shows a partially sectioned perspective view of a powder sprayer constructed according to the invention,
FIG. 2 shows the rear end of the sprayer in a partially sectioned view,
FIG. 3 shows the front end of the sprayer in a partially sectioned view,
FIGS. 4-8 show various embodiment examples of possible loop formations for the charging ducts, and
FIG. 9 shows a charging duct curved in an undulating formation.
DETAILED DESCRIPTION OF PREFERRED EMBODIMENTS
A powder constructed according to the invention which has the ability to charge electrostatically and which is designated with the numeral 1 on the drawings is formed by a plurality of elongated charging ducts 2 made of electrically non-conducting material. Suitable materials are plastics, for example, or other similar materials. The charging ducts 2, which are appropriately coated over part of their length with an electrically-conducting layer such as metal, are accommodated via one of their respective ends, preferably their rear end, in a core 3. The core 3 which is exemplified on the drawing in FIG. 2 is formed of two circular plates 4 and 5 which have a number of openings 6 and 7 respectively round their periphery, distributed in a circle and corresponding to the number of ducts 2, being adapted to the said charging ducts 2. The openings 6 in one core plate 4 form passageways 6 for the respective ducts 2 and this plate 4 is made of a material which is electrically conducting, such as aluminum, for example. The openings 7 in the other core plate 5 which is expediently manufactured from a plastic material have a shape such that the ends 2A of the tubular ducts 2, which are distorted after they have been inserted through the openings 6 in the other plate 4, can be accommodated therein in that, for example, the plate 5 is provided with larger bores 8 on the side 5A of the plate 5 which lies against the plate 4. On the other side 5B of the plate 5, i.e. the side 5B which is furthest away from the plate 4, the openings 7 have, for example, funnel-shaped outlets 9 to allow the powder to pass in through the openings 7 into the tubes 2. The plate 5 is expediently attached to the plate 4 by means of a screw 10 as shown on the drawing in FIG. 2. The plate 4 has a connection 11 with which the sprayer can be connected to earth or to a voltage source via a line which is not shown on the drawing, and connected to the coating on the charging ducts 2.
A seal in the form of an O-ring 3A, for example, is arranged to rest between the core 3 and a sleeve-type connection 12 which is designed to be used for connecting the powder sprayer 1 to a powder-supplying hose or the like.
As shown in FIG.
REFERENCES:
patent: 2739838 (1956-03-01), Sedlacsik
patent: 3421693 (1969-01-01), Fraser
patent: 3735925 (1973-05-01), Benedek et al.
patent: 4139155 (1979-02-01), Hastings
patent: 4227652 (1980-10-01), Itoh
Forman Michael J.
Peters Jr. Joseph F.
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