Rotary atomizing electrostatic applicator and shaping air ring for the same

Patent metadata

Field	Value
Publication number	US-10016770-B2
Application number	US-201615041138-A
Country	US
Kind code	B2
Filing date	Feb 11, 2016
Priority date	Feb 16, 2015
Publication date	Jul 10, 2018
Grant date	Jul 10, 2018

Abstract

The present invention solves a problem of a trade-off between increases in paint discharge rate and maintenance of painting quality. A rotary atomizing electrostatic applicator includes a bell cup 10 whose back 10 a is hit by atomization air SA-IN at an angle of 90 degrees or less; and first air holes 30 adapted to discharge the atomization air SA-IN directed at the back 10 a of the bell cup, wherein the first air holes 30 are arranged at equal intervals on a circumference centered around a rotation axis of the bell cup 10 , the first air holes 30 are oriented in a direction opposite to a rotation direction of the bell cup 10 ; and the atomization air SA-IN discharged through the first air holes 30 is twisted in the direction opposite to the rotation direction of the bell cup 10 at an angle of 50 degrees or more and less than 60 degrees.

First claim

What is claimed is:

1. A rotary atomizing electrostatic applicator comprising:
a bell cup whose back is hit by atomization air, an angle of the back with respect to a plane of an outer circumferential edge of the bell is 90 degrees or less;
first air holes adapted to discharge the atomization air directed at the back of the bell cup; and
second air holes arranged on an outer circumferential side of the first air holes and configured to discharge a pattern air,
wherein the first air holes are arranged at equal intervals on a circumference centered around a rotation axis of the bell cup, and the first air holes are oriented in a direction opposite to a rotation direction of the bell cup,
wherein the bell cup is configured to rotate in a first direction about an axis of rotation thereof,
wherein the atomization air discharged through the first air holes is twisted in a second direction opposite to the first direction at a twist angle,
wherein the twist angle is the angle of atomization air discharged through the first air holes twisted in the second direction, and the twist angle of the atomization air is 50 degrees or more and less than 60 degrees, and
wherein the pattern air discharged through the second air holes passes radially outward of an outer circumferential edge of the bell cup.

2. The rotary atomizing electrostatic applicator according to claim 1 , wherein the twist angle of the atomization air is 56 degrees to 59 degrees.

3. The rotary atomizing electrostatic applicator according to claim 1 , wherein the twist angle of the atomization air is 56 degrees to 58 degrees.

4. The rotary atomizing electrostatic applicator according to claim 1 , wherein an air travel distance covered by the atomization air traveling from the first air holes to the back of the bell cup is equal to or smaller than 26.7 mm.

5. The rotary atomizing electrostatic applicator according to claim 1 , wherein an air travel distance covered by the atomization air traveling from the first air holes to the back of the bell cup is 30 mm to 1 mm.

6. The rotary atomizing electrostatic applicator according to claim 1 , wherein an air travel distance covered by the atomization air traveling from the first air holes to the back of the bell cup is 15 mm to 1 mm.

7. The rotary atomizing electrostatic applicator according to claim 1 , wherein an air travel distance covered by the atomization air traveling from the first air holes to the back of the bell cup is 10 mm to 1 mm.

8. The rotary atomizing electrostatic applicator according to claim 1 , wherein a discharge pressure of the atomization air discharged through the first air holes is 0.03 to 0.2 MPa.

9. The rotary atomizing electrostatic applicator according to claim 1 , wherein a discharge pressure of the atomization air discharged through the first air holes is 0.03 to 0.15 MPa.

10. The rotary atomizing electrostatic applicator according to claim 8 , wherein a discharge rate of the atomization air is 180 to 435 NL/min.

11. The rotary atomizing electrostatic applicator according to claim 1 , wherein a maximum paint discharge rate is 1,000 cc/min to 300 cc/min.

12. The rotary atomizing electrostatic applicator according to claim 1 , wherein the pattern air is twisted in the direction opposite to the rotation direction of the bell cup.

13. The rotary atomizing electrostatic applicator according to claim 12 , wherein the first air holes are smaller in diameter than the second air holes.

14. The rotary atomizing electrostatic applicator according to claim 12 , wherein the first air holes are larger in number than the second air holes.

15. The rotary atomizing electrostatic applicator according to claim 14 , wherein the number of the first air holes is twice the number of the second air holes or more.

16. The rotary atomizing electrostatic applicator according to claim 1 , wherein when the rotary atomizing electrostatic applicator is viewed from a side, the first air holes are positioned at positions close to the bell cup and the second air holes are positioned at positions away from the bell cup.

17. The rotary atomizing electrostatic applicator according to claim 1 , wherein a rotational speed of the bell cup is 25,000 to 15,000 rpm.

18. A shaping air ring applied to the rotary atomizing electrostatic applicator according to claim 1 , comprising the first air holes.

19. A shaping air ring applied to the rotary atomizing electrostatic applicator according to claim 1 , comprising the first air holes and the second air holes.

Assignees

• Toyota Motor Co Ltd
• Ransburg Ind Finishing Kk

Inventors

• Yamasaki Isamu
• Kobayashi Shunya
• Mitsui Michio
• Yoshida Osamu
• Yokomizo Yoshiharu

Classifications

• B05B5/03

  characterised by the use of gas {, e.g. electrostatically assisted pneumatic spraying (B05B5/04, B05B5/043, B05B5/047 take precedence)} · CPC title

• B05B5/0426

  Means for supplying shaping gas · CPC title

• B05B5/0407 Primary

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

• B05B5/1683

  specially adapted for particulate materials · CPC title

• B05B3/1092

  Means for supplying shaping gas · CPC title