ARRANGEMENT AND PROCESS FOR TREATING A SURFACE

Abstract

An apparatus and method for treating a surface with a jet having a multiplicity of particles, comprising an outer nozzle and at least two inner nozzle units, which are enclosed by the outer nozzle and are designed to introduce in each case a stream of propellant gas mixed with a multiplicity of particles into the outer nozzle, the outer nozzle being designed to combine the streams of propellant gas of the inner nozzle units to form an overall stream of propellant gas.

Claims

1.-9. (canceled)

10. An apparatus for treating a surface with a jet comprising a multiplicity of particles, the apparatus comprising: an outer nozzle, and at least two inner nozzle units, enclosed by the outer nozzle and designed to introduce a stream of propellant gas mixed with a multiplicity of particles into the outer nozzle, the outer nozzle configured to combine the streams of propellant gas of the inner nozzle units to form an overall stream of propellant gas.

11. The apparatus of claim 10, wherein the outer nozzle is configured as an outer Laval nozzle.

12. The apparatus of claim 10, wherein the outer nozzle has at least partly an oval cross section.

13. The apparatus of claim 10, wherein at least one of the inner nozzle units comprises at least one inner Laval nozzle.

14. The apparatus of claim 10, wherein at least one of the inner nozzle units comprises at least one mixing chamber and an inner nozzle.

15. The apparatus of claim 14, further comprising an inlet into the mixing chamber having an inlet cross-sectional area that differs from a nozzle cross-sectional area of the inner nozzle.

16. The apparatus of claim 10, wherein at least one of the inner nozzle units comprises at least one particle generator.

17. A process for treating a surface with a jet comprising a multiplicity of particles, utilizing the apparatus of claim 10.

18. The process of claim 17, wherein the treating of the surface comprises at least one of the following steps: cleaning the surface, and removing flash or burr from the surface.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

[0046] The invention and the technical environment are explained in more detail below on the basis of the figures. The figures show particularly preferred exemplary embodiments, to which however the invention is not restricted. In particular, it should be pointed out that the figures, and in particular the relative sizes represented, are only schematic. In the figures:

[0047] FIG. 1 schematically shows a frontal sectional representation of an arrangement for treating a surface, and

[0048] FIG. 2 schematically shows a lateral sectional representation of an inner nozzle unit of the arrangement from FIG. 1.

DESCRIPTION OF PREFERRED EMBODIMENTS

[0049] FIG. 1 shows a frontal sectional representation of an arrangement 1 for treating a surface with a jet comprising a multiplicity of particles. In this representation, the jet is oriented out of the plane of the drawing. The arrangement comprises an outer nozzle 3, configured as an outer Laval nozzle 5. The outer nozzle 3 has an oval cross section. The arrangement 1 also has two inner nozzle units 4, which are enclosed by the outer nozzle 3 and are designed to introduce in each case a stream of propellant gas mixed with a multiplicity of particles into the outer nozzle 3. The outer nozzle 3 is designed to combine the streams of propellant gas of the inner nozzle units 4 to form an overall stream of propellant gas.

[0050] FIG. 2 shows a lateral sectional representation of an example of an inner nozzle unit 4 of the arrangement 1 from FIG. 1. In this representation, the jet comprising a multiplicity of particles is oriented to the right-hand side. The inner nozzle unit 4 comprises a mixing chamber 2 with an inlet 7 for a stream of propellant gas. The mixing chamber 2 is designed to mix the stream of propellant gas with the multiplicity of particles. The inner nozzle unit 4 also comprises an inner nozzle 8, which is configured as an inner Laval nozzle 6, adjoins the mixing chamber 2 and is connected to it in terms of flow. A nozzle cross-sectional area of the inner Laval nozzle 6 as it progresses from the mixing chamber 2 is at first reduced in size to a minimum nozzle cross-sectional area and then increased in size again. The inlet 7 has an inlet cross-sectional area, an area quotient between the minimum nozzle cross-sectional area and the inlet cross-sectional area lying in the range from 15 to 300, preferably 25 to 225. In particular with regard to the area quotient, it should be pointed out that FIG. 2 is schematic and not to scale.

[0051] FIG. 2 also shows a particle generator 9, which is designed to generate the multiplicity of particles and introduce them into the mixing chamber 2 in a solid state.

[0052] With the arrangement presented and the process presented for treating a surface, a particularly uniform, particularly effective and particularly time-saving treatment of the surface can be achieved, for which purpose a particularly wide and uniform jet of particles can be used. This applies in particular to cleaning and removing flash or burr. The arrangement and the process may be used in particular in the production of wire or plastic products.

LIST OF DESIGNATIONS

[0053] 1 arrangement [0054] 2 mixing chamber [0055] 3 outer nozzle [0056] 4 inner nozzle unit [0057] 5 outer Laval nozzle [0058] 6 inner Laval nozzle [0059] 7 inlet [0060] 8 inner nozzle [0061] 9 particle generator

[0062] It will be understood that many additional changes in the details, materials, steps and arrangement of parts, which have been herein described in order to explain the nature of the invention, may be made by those skilled in the art within the principle and scope of the invention as expressed in the appended claims. Thus, the present invention is not intended to be limited to the specific embodiments in the examples given above.