Nozzle arrangement for a spray gun

Patent metadata

Field	Value
Publication number	US-11141747-B2
Application number	US-201615575549-A
Country	US
Kind code	B2
Filing date	May 18, 2016
Priority date	May 22, 2015
Publication date	Oct 12, 2021
Grant date	Oct 12, 2021

Abstract

A nozzle arrangement for a spray gun, in particular a paint spray gun, has at least one paint nozzle and an air cap. The paint nozzle has at least one outlet opening for the material to be sprayed and the air cap has at least one central opening which is bounded by at least one wall. The at least one wall forms a gap with at least one part of the paint nozzle, and a forward part of the paint nozzle has at least an inner face, an outer face and an end face. The end face of the paint nozzle encloses, at least in certain regions, an angle of greater than 90° or an angle of less than 90° with an outer face or an inner face of the paint nozzle. In the nozzle arrangements, the back-pressure counter to the outflow of the material to be sprayed is lower than in prior art nozzles. A spray gun, in particular a paint spray gun, having such a nozzle arrangement is also disclosed.

First claim

The invention claimed is:

1. A nozzle arrangement for a paint spray gun comprising:
a paint nozzle; and
one air cap,
wherein the paint spray gun is a compressed air paint spray gun in which air atomizes a material to be sprayed,
wherein the paint nozzle has at least one outlet opening for the material to be sprayed,
wherein the air cap has at least one central opening which is delimited by at least one wall,
wherein a front part of the paint nozzle has at least one internal face, one external face, and one end face that is adjacent to the external face,
wherein the at least one wall conjointly with a portion of the external face of the paint nozzle forms a gap in the radial direction,
wherein the end face of the paint nozzle in relation to the portion of the external face of the paint nozzle that forms the gap at least in portions encloses an angle of more than 90°,
wherein a portion of the end face of the paint nozzle is concave, the concave portion of the end face of the paint nozzle being an annular concave portion that completely encircles the outlet opening of the paint nozzle,
wherein a region of the end face is between the concave portion of the end face and the internal face of the paint nozzle, this region being a straight face or a chamfer, and
wherein the concave portion of the end face extends beyond the air cap.

2. The nozzle arrangement as claimed in claim 1 , wherein the portion of the external face of the paint nozzle that forms the gap is disposed so as to be substantially parallel with the internal face of the paint nozzle.

3. The nozzle arrangement as claimed in claim 1 , wherein the internal face of the paint nozzle in a front region runs so as to be substantially parallel with a paint nozzle longitudinal axis.

4. The nozzle arrangement as claimed in claim 1 , wherein the interior of the paint nozzle in a front region tapers in the spraying direction.

5. The nozzle arrangement as claimed in claim 1 , wherein the interior of the paint nozzle in a front region widens in the spraying direction.

6. The nozzle arrangement as claimed in claim 1 , wherein the end face of the paint nozzle is assembled from at least two faces which in relation to the internal face of the paint nozzle enclose dissimilar angles.

7. The nozzle arrangement as claimed in claim 1 , wherein the wall that delimits the central opening of the air cap is disposed so as to be at least in part substantially parallel with the portion of the external face of the paint nozzle that forms the gap.

8. The nozzle arrangement as claimed in claim 1 , wherein the wall that delimits the central opening of the air cap in a region that faces away from the spraying direction has a spacing from the external face of the paint nozzle that is larger than in a region that faces the spraying direction.

9. The nozzle arrangement as claimed in claim 1 , wherein the wall that delimits the central opening of the air cap in a region that faces away from the spraying direction has a spacing from the external face of the paint nozzle that is smaller than in a region that faces the spraying direction.

10. The nozzle arrangement as claimed in claim 1 , wherein the wall that delimits the central opening of the air cap is designed so as to be convex at least in regions.

11. The nozzle arrangement as claimed in claim 1 , wherein the wall that delimits the central opening of the air cap is designed so as to be concave at least in regions.

12. The nozzle arrangement as claimed in claim 1 , wherein the paint nozzle has at least one duct for conducting air.

13. The nozzle arrangement as claimed in claim 1 , wherein said nozzle arrangement has an air-deflection disk for homogenizing the pressure conditions.

14. The nozzle arrangement as claimed in claim 1 , wherein the air cap has at least two horns each having at least one horn air opening.

15. The nozzle arrangement as claimed in claim 14 , wherein the air cap at least in one region between the central opening and the horns has control ducts for exhausting air.

16. The nozzle arrangement as claimed in claim 15 , wherein the control ducts in the assembled state of the paint nozzle and the air cap are at least in regions disposed so as to be substantially parallel with a paint nozzle longitudinal axis.

17. A paint spray gun, wherein said paint spray gun has a nozzle arrangement as claimed in claim 1 .

18. The nozzle arrangement as claimed in claim 1 , wherein the region between the concave portion of the end face and the internal face is a transitional region therebetween formed by the straight face or chamfer.

19. The nozzle arrangement as claimed in claim 1 , wherein the end face of the paint nozzle consists of the concave portion and the region that is the straight face or chamfer.

20. The nozzle arrangement as claimed in claim 1 , wherein the at least one wall conjointly with at least part of the paint nozzle forms the gap for through which the air exits to atomize the material to be sprayed.

21. The nozzle arrangement as claimed in claim 1 , wherein the gap is formed such that the air exits from the gap and generates a vacuum on the end face of the paint nozzle so as to suction the material to be sprayed from the paint nozzle.

22. The nozzle arrangement as claimed in claim 1 , wherein all of the end face is located in front of the air cap.

23. The nozzle arrangement as claimed in claim 1 , wherein the end face connects the external face and the internal face of the paint nozzle.

24. The nozzle arrangement as claimed in claim 1 , wherein the portion of the external face of the paint nozzle that forms the gap runs substantially parallel with a paint nozzle longitudinal axis.

Assignees

• Sata Gmbh & Co Kg

Inventors

• Schmon Ewald
• Maier Daniel

Classifications

• B05B7/066 Primary

  with an inner liquid outlet surrounded by at least one annular gas outlet · CPC title

• B05B7/068 Primary

  the annular gas outlet being supplied by a gas conduit having an axially concave curved internal surface just upstream said outlet · 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