Claims
- 1. In a rotatable, electrically chargeable, substantially bell-shaped sprayer for producing a paint mist from an axially fed liquid paint such as 2-component lacquers, for an apparatus for the electrostatic application of sprayed charged particles of the paint mist onto an article, the sprayer having an inner annular coaxial flowover surface for said liquid paint fed thereto via an inlet for the liquid paint and an annular lip which projects axially forwardly on a radial and axial outermost edge portion of the inner annular coaxial flowover surface, said outermost edge portion of the inner annular coaxial flowover surface being provided with grooves for channeling the flow of the liquid paint, the grooves being uniformly distributed on the circumference of said outermost edge portion of the inner annular coaxial flowover surface and extend approximately in the direction of the flow of said liquid paint, said grooves terminating open at a spray position of said lip, the improvement wherein
- said grooves form two sets of grooves, the grooves of each set extending substantially parallel to each other and intersecting said grooves of the other set of grooves at intersection regions,
- said grooves have a uniform cross-section along their entire length between said intersection regions,
- said grooves are substantially linear along their entire length,
- said outermost edge portion of the inner annular coaxial flowover surface has a substantially radially inwardly directed elevation on said flowover surface, said elevation defining a radially inwardly facing surface coaxial to said annular coaxial flowover surface, said grooves are formed in said elevation and have a bottom of the grooves passing continuously into an adjacent portion of said flowover surface,
- said grooves have a symmetrical V-shaped cross-section and divide said elevation into a plurality of substantially truncated pyramids arranged substantially parallel to each other and each of said truncated pyramids having four lateral sides with a parallelogram base, only two adjacent sides of adjacent of said pyramids respectively defining the V-shaped and uniform cross-section and linearity of the grooves along their entire length between said intersection regions, and
- said grooves disposed for channelling said liquid paint into at least a first and a second coherent thread of liquid, each of said threads extending beyond said sprayer edge by a measurable distance and substantially all of said threads extending substantially the same said measurable distance beyond said sprayer edge.
- 2. The sprayer as set forth in claim 1, wherein
- each of said grooves of each of said sets intersects two to four other said grooves of the other of said sets at an angle of 30.degree. to 90.degree.,
- said other grooves extend substantially transversely to said each groove.
- 3. The sprayer as set forth in claim 2, wherein
- the width of said outermost edge portion of the inner annular coaxial flowover surface is approximately twice the perpendicular distance between centers of adjacent of said parallel grooves.
- 4. The sprayer as set forth in claim 1, wherein
- each of said grooves has a triangular cross section with its apex at said bottom of said grooves, the maximum width of each of said grooves is 0.2 to 0.4 mm and the depth of each of said grooves is half of said maximum width.
- 5. The sprayer as set forth in claim 4, wherein
- the width of said outermost edge portion of the inner annular coaxial flowover surface is approximately twice the perpendicular distance between centers of adjacent of said parallel grooves.
- 6. The sprayer as set forth in claim 1, wherein
- an imaginary bisector of the angle between said intersecting grooves is perpendicular to the outermost edge portion of said flowover surface.
- 7. The sprayer as set forth in claim 1, wherein
- said inlet extends substantially radially to said flowover surface.
- 8. The sprayer as set forth in claim 1, wherein
- said substantially radially inwardly directed elevation has a uniform thickness from said flowover surface to said radially inwardly facing surface of said substantially radially inwardly directed elevation, said elevation is divided by said intersecting grooves into said plurality of pyramids each having said four lateral sides constituting substantially laterally facing surfaces aligned and parallel respectively to corresponding of said laterally facing surfaces of said adjacent of said pyramids defining therebetween said uniform cross-section and linearity of said grooves.
- 9. The sprayer as set forth in claim 8, wherein
- each of said four lateral sides of each of said truncated pyramids have the same length, said parallelogram bases of said pyramids having equal sides.
Priority Claims (1)
Number |
Date |
Country |
Kind |
3040136 |
Oct 1980 |
DEX |
|
RELATED APPLICATION
This is a continuation of my co-pending application Ser. No. 313,090 Filed: Oct. 20, 1981 now abandoned.
US Referenced Citations (3)
Foreign Referenced Citations (1)
Number |
Date |
Country |
9985 |
Jan 1910 |
GBX |
Continuations (1)
|
Number |
Date |
Country |
Parent |
313090 |
Oct 1981 |
|