Rotary atomizer nozzle head, and rotary atomizer with such a nozzle head

Patent metadata

Field	Value
Publication number	US-9707578-B2
Application number	US-201314404207-A
Country	US
Kind code	B2
Filing date	May 16, 2013
Priority date	May 30, 2012
Publication date	Jul 18, 2017
Grant date	Jul 18, 2017

Abstract

A bell plate is rotated about a rotational axis, and coating material is supplied to a discharge surface of the bell plate such that the coating material is projected away from the bell plate. A working fluid is blown at least temporarily as a transonic or supersonic flow onto the coating material coming from the bell plate by means of a dispensing device. Furthermore, a spray head for a rotary atomizer is provided for applying a coating material to an object, having a bell plate which can be rotated about a rotational axis and which has a discharge surface, wherein coating material can be supplied to the discharge surface such that the coating material is projected away from the bell plate. A dispensing device which can blow a working fluid at least temporarily as a transonic or supersonic flow onto the coating material coming from the bell plate.

First claim

The invention claimed is:

1. Nozzle head for a rotary atomizer for applying a coating material to an object comprising:
a bell disc which is rotatable about a rotational axis and has a flow-off surface which is supplied with coating material in such a way that coating material is hurled away from the bell disc, the bell disc being surround by a guiding body
wherein
a discharge device is present, by means of which a working fluid is blown at least temporarily as a transonic or supersonic flow onto coating material coming from the bell disc, and
an outer lateral surface of the bell has a first annular prominence formed thereon and an inner lateral surface of the guiding body has a second annular prominence formed thereon, the prominences being configured opposite each other and defining an annular gap there between.

2. Nozzle head according to claim 1 , wherein the first annular prominence and the second annular prominence form a Laval annular nozzle which blows the working fluid in the direction of a breakaway edge of the bell disc.

3. Nozzle head according to claim 1 , wherein the first annular prominence and the second annular prominence form a Laval annular nozzle which blows the working fluid onto coating material separating from a breakaway edge of the bell disc.

4. Nozzle head according to claim 1 , wherein the annular gap comprises a Laval nozzle unit having an annular discharge gap or a plurality of discharge openings.

5. Nozzle head according to claim 4 , wherein a fluid source is present, from which the Laval nozzle unit is supplied with the working fluid under positive pressure.

6. Nozzle head according to claim 1 , wherein an annular channel is present between the bell disc and the guiding body, the annular channel being wider than the annular gap.

7. Nozzle head according to claim 1 , wherein the outer lateral surface of the bell disc forms a truncated cone surface.

8. Rotary atomizer for applying a coating material to an object having a nozzle head wherein, the nozzle head is formed according to claim 1 .

9. Nozzle head according to claim 1 , wherein in an annular channel present there are arranged guide vanes which are configured such that, on rotation of one or more of the bell disc and a guiding body, working fluid situated in the annular channel is conveyed to the annular gap.

Assignees

• Eisenmann Se

Inventors

• Meier Ralph
• Lang-Koetz Claus
• Reichler Jan
• Kalmbach Thomas
• Liebing Manuel
• Hauber Markus

Classifications

• B05B3/1064

  the liquid or other fluent material to be sprayed being axially supplied to the rotating member through a hollow rotating shaft · CPC title

• B05B3/1092

  Means for supplying shaping gas · CPC title

• B05B3/1014 Primary

  with a spraying edge, e.g. like a cup or a bell · CPC title

• B05B7/0815

  with at least one gas jet intersecting a jet constituted by a liquid or a mixture containing a liquid for controlling the shape of the latter · CPC title

• B05B5/0426

  Means for supplying shaping gas · CPC title