Axial turbine for a rotary atomizer

Patent metadata

Field	Value
Publication number	US-9604232-B2
Application number	US-201113638193-A
Country	US
Kind code	B2
Filing date	Mar 2, 2011
Priority date	Mar 31, 2010
Publication date	Mar 28, 2017
Grant date	Mar 28, 2017

Abstract

A turbine rotor, e.g., for a drive turbine of a rotary atomizer, is disclosed having a rotatably supported turbine shaft with the potential for mounting an atomizer wheel, and having at least one drive turbine wheel having a plurality of turbine blades. The turbine blades of the drive turbine wheel may be impinged on during operation by a drive fluid in order to drive the turbine rotor. The drive turbine wheel may be designed for the drive fluid to axially impinge on the turbine blades. A complete drive turbine having such a turbine rotor is also disclosed, as well as a complete rotary atomizer and individual exemplary components of the drive turbine.

First claim

The invention claimed is:

1. A turbine rotor assembly adapted for a drive turbine of a rotary atomizer, comprising:
a housing;
a turbine shaft rotatably supported by the housing and configured to be secured to a bell cup;
first and second drive turbine wheels each coupled to the turbine shaft and each coaxially oriented with the turbine shaft, each of the first and second drive turbine wheels having a plurality of radially-protruding turbine blades, wherein the turbine blades of the first and second drive turbine wheels are configured to translate forces from an axial drive flow to drive rotation of the first and second drive turbine wheels and the turbine rotor;
first and second stator rings each coupled to the housing and respectively radially surrounding the first and second drive turbine wheels;
a deflection ring coupled to the housing and coaxially oriented with the turbine shaft, the deflection ring being axially forward of the first and second drive turbine wheels,
wherein the deflection ring and the first and second stator rings define an axially-extending drive flow path overlapping the turbine blades of the first and second drive turbine wheels, respectively.

2. The turbine rotor assembly according to claim 1 , wherein the first and second drive turbine wheels are axially arranged one behind the other.

3. The turbine rotor assembly according to claim 1 , wherein
the first and second drive turbine wheels extend over a first axial drive length and the housing defines a first outer housing diameter, the housing and the first and second drive turbine wheels being configured with a ratio greater than 0.4 and less than 1, and
the first and second stator rings define a maximum stator outer diameter, the first and second stator rings and the first and second drive turbine wheels being configured with a ratio greater than 0.4 and less than 0.5.

4. The turbine rotor assembly according to claim 1 , wherein
the turbine blades of the first and second
drive turbine wheels have different blade heights, respectively.

5. The turbine rotor assembly according to claim 1 , wherein:
each of the first and second drive turbine wheels has a density of turbine blades greater than 15 turbine blades per drive turbine wheel and less than 80 turbine blades per drive turbine wheel, and
the first and second drive turbine wheels have different densities of turbine blades.

6. The turbine rotor assembly according to claim 5 , wherein the first and second drive turbine wheels are arranged so that the density of turbine blades of the first and second drive turbine wheels, respectively, increases in the direction of the axial drive flow.

7. The turbine rotor assembly according to claim 5 , wherein the first and second drive turbine wheels are arranged so that the density of turbine blades of the first and second drive turbine wheels, respectively, increases against the direction of the axial drive flow.

8. The turbine rotor assembly according to claim 1 , wherein
at least one of the first and second drive turbine wheels is removably coupled to turbine shaft.

9. The turbine rotor assembly according to claim 1 , wherein at least one of the first and second drive turbine wheels and the turbine shaft are formed in one piece.

10. The turbine rotor assembly according to claim 1 , wherein
the turbine shaft has a pair of bearing points for rotatable mounting of the turbine shaft, and
the first and second drive turbine wheels are arranged axially between the pair of bearing points.

11. The turbine rotor assembly according to claim 10 , further including:
a brake turbine wheel with a plurality of turbine blades coupled to the turbine shaft and coaxially oriented with the turbine shaft,
the brake turbine wheel being configured to operate with a radial flow of the brake fluid.

12. The turbine rotor assembly according to claim 11 , wherein the brake turbine wheel is arranged axially outside of the pair of bearing points.

13. The turbine rotor assembly according to claim 11 , wherein the brake turbine wheel has a larger diameter than the first and second drive turbine wheels.

14. The turbine rotor assembly according to claim 11 , wherein
the turbine blades of each of the first and second drive turbine wheels and the brake turbine wheel each have a front edge which is aligned with an inlet angle defined relative to the axis of rotation of the turbine rotor, and
the turbine blades of each of the first and second drive turbine wheels and the brake turbine wheel each have a rear edge which is aligned with an outlet angle defined relative to the axis of rotation of the turbine rotor, and
the sum of the inlet angle and the outlet angle are configured with a sum greater than 90° and less than 160°, with the outlet angle being greater than 55° and smaller than 85°.

15. The turbine rotor assembly according to claim 1 , wherein
the turbine rotor is configured to have a certain specific rotational speed n s during operation, the specific rotation speed n s defined using the following formula:

n
S

=

ω
·

V
0.5

ⅇ
0.75

with:
V: volumetric flow rate at the entrance [m 3 /s]
e: specific work [J/kg]
ω: rotational speed [rad/s], and
wherein the specific rotational speed n s is less than 0.4 and greater than 0.07.

16. The turbine rotor assembly according to claim 10 , wherein
each of the pair of bearing points of the turbine shaft define an axial bearing length,
the turbine shaft has a shaft diameter,
and
the bearing length of each of the pair of bearing points and the shaft diameter being configured with a ratio greater than 0.6 and less than 1.4.

17. The turbine rotor assembly according to claim 1 , wherein the turbine shaft is hollow and has a shaft internal diameter configured to to receive a paint tube with two main needles and two returns.

18. The turbine rotor assembly according to claim 1 , wherein the turbine shaft is hollow and has a shaft internal diameter configured to receive two mixing elements for a two-component material.

19. The turbine rotor assembly according to claim 1 , wherein the turbine shaft is hollow and has a shaft internal diameter of more than 18 mm and less than 22 mm.

20. The turbine rotor assembly according to claim 1 , wherein the turbine blades of the first and second drive turbine wheels each have a radial blade height greater than 0.5 mm and less than 60 mm.

21. The turbine rotor assembly according to claim 1 , wherein the turbine blades of the first and second drive turbine wheels have a radial blade height, the turbine shaft defines a shaft diameter, and the turbine blades and the turbine shaft being configured with a ratio of the blade height and the shaft diameter being greater than 0.01 and less than 3.

22. The turbine rotor assembly according to claim 1 , wherein the first drive turbine wheel is axially between the deflection ring and the second drive turbine wheel.

23. The turbine rotor assembly of claim 22 , wherein the turbine blades of the first drive tu

Assignees

• Baumann Michael
• Herre Frank
• Frey Marcus
• Seiz Bernhard
• Krumma Harry
• Beyl Timo
• Schiffmann Jürg
• Scholl Stephan
• Duerr Systems Gmbh

Inventors

• Baumann Michael
• Herre Frank
• Frey Marcus
• Seiz Bernhard
• Krumma Harry
• Beyl Timo
• Schiffmann Jürg
• Scholl Stephan

Classifications

• B05B3/1092

  Means for supplying shaping gas · CPC title

• B05B3/1042

  Means for connecting, e.g. reversibly, the rotating spray member to its driving shaft · CPC title

• B05B5/0415

  Driving means; Parts thereof, e.g. turbine, shaft, bearings · CPC title

• B05B3/1035 Primary

  Driving means; Parts thereof, e.g. turbine, shaft, bearings · CPC title

• B05B3/003

  with braking means, e.g. friction rings designed to provide a substantially constant revolution speed · CPC title