Diffuser Shape Vent Slots in a Hand Torch Shield Castellation

• US 20150014285A1
• Filed: 08/25/2014
• Published: 01/15/2015
• Est. Priority Date: 07/16/2010
• Status: Active Grant

• Current Assignee: Hypertherm Incorporated
• Original Assignee: Hypertherm Incorporated
• Inventors: Duan, Zheng, Patel, Shreyansh, Moody, Steven, Pecor, Nicholas
• Granted Patent: US 9,462,670 B2
• Time in Patent Office: Days
• US Class Current: 219/121.5
• CPC Class Codes: B23K 10/00 Welding or cutting by means of a plasma
• CPC Class Codes: B23K 10/02 Plasma welding
• CPC Class Codes: B23K 9/013 Arc cutting, gouging, scarfing or desurfacing
• CPC Class Codes: H05H 1/34 Details, e.g. electrodes, nozzles
• CPC Class Codes: H05H 1/3457 Nozzle protection devices
• CPC Class Codes: H05H 1/3478 Geometrical details

Abstract

A torch tip for a plasma arc torch includes a body having a first end, configured to attach to the torch, and a second end, where an end wall is disposed. A plasma exit orifice is formed in the end wall. At least two castellations are formed in the end wall. Each castellation has a castellation width defined by the distance between the sidewalls of that castellation. At least one slot is disposed between two castellations. Each slot has a slot width defined by a distance between the sidewalls of its adjacent castellations. The slot width can be at least twice the castellation width. Each slot also has a slot floor and an exterior shape. The slot floor can have slope that tapers toward the first end of the body in an outward radial direction and the exterior shape of the slot can have a generally V-shaped or U-shaped contour.

Claims

1. A torch tip for a plasma arc torch, the torch tip comprising:

a body having a first end and a second end, the first end of the body configured to attach to the plasma arc torch;

an end wall disposed at the second end of the body;

a plasma exit orifice formed in the end wall at the second end of the body;

at least two castellations formed in an exterior surface of the end wall, each castellation having a castellation width defined by a distance between a first sidewall of each castellation and a second sidewall of each castellation at the second end of the body;

at least one slot disposed between the two castellations, each slot having a slot floor and a slot width, and the slot width being defined by a distance between the first sidewall of a first castellation and the second sidewall of a second castellation adjacent the first castellation at the second end of the body, the slot width increasing with axial or radial distance away from the plasma exit orifice;

wherein the slot width is at least twice the castellation width.

2. The torch tip of claim 1 wherein the slot width increases on an order of at least about one unit with axial distance away from the plasma exit orifice.

3. The torch tip of claim 1 wherein the slot width increases on an order of at least about two units with radial distance away from the plasma exit orifice.

4. The torch tip of claim 1 wherein the slot floor having a slope that tapers toward the first end of the body in an outward radial direction within the at least one slot.

5. The torch tip of claim 1 wherein the slot width is about 0.24 inches.

6. The torch tip of claim 1 wherein the castellation width is about 0.064 inches.

7. The torch tip of claim 1 wherein a ratio of the slot width to the castellation width is about 2:

1

8. The torch tip of claim 1 wherein a ratio of the slot width to the castellation width is about 3.5:

1

9. The torch tip of claim 1 wherein the at least one slot has a slot floor and an exterior shape, the exterior shape having a generally V-shaped contour extending between a first point on the first sidewall of the first castellation, a lowermost point of the slot floor, and a second point on the second sidewall of the second castellation.

10. The torch tip of claim 9 wherein the V-shaped contour defines an angle of about 118 degrees.

11. The torch tip of claim 1 wherein the at least one slot has an exterior shape with a generally U-shaped structure that extends between a first point on the first sidewall of the first castellation and a second point on the second sidewall of the second castellation.

12. The torch tip of claim 1 wherein the torch tip is a shield.

13. The torch tip of claim 1 wherein the torch tip includes three castellations and three slots disposed between the castellations.

14. The torch tip of claim 1 wherein the castellation width is defined by the distance between the first sidewall and the second sidewall measured across an outer perimeter or an inner perimeter of each castellation.

15. A torch tip for a plasma arc torch, the torch tip comprising:

a body having a first end and a second end, the first end of the body configured to attach to the plasma arc torch;

an end wall disposed at the second end of the body;

a plasma exit orifice formed in the end wall at the second end of the body;

at least two castellations formed in an exterior surface of the end wall;

at least one slot disposed between the two castellations, each slot extending between a first sidewall of a first castellation and a second sidewall of a second castellation adjacent the first castellation at the second end of the body, each slot having a slot floor and an exterior shape, the exterior shape having a generally V-shaped contour extending between a first point on the first sidewall of the first castellation, a lowermost point of the slot floor, and a second point on the second sidewall of the second castellation.

16. The torch tip of claim 15 wherein the V-shaped contour defines an angle of about 118 degrees.

17. The torch tip of claim 15 wherein the V-shaped contour results from using a cone-shaped tool on the second end of the body.

18. The torch tip of claim 15 wherein each castellation comprises a castellation width defined by a distance between the first sidewall of each castellation and the second sidewall of each castellation at the second end of the body and the at least one slot comprises a slot width defined by a distance between the first sidewall of the first castellation and the second sidewall of a second castellation adjacent the first castellation at the second end of the body, wherein the slot width is at least twice the castellation width.

19. A torch tip for a plasma arc torch, the torch tip comprising:

a body having a first end and a second end, the first end of the body configured to attach to the plasma arc torch;

an end wall disposed at the second end of the body;

a plasma exit orifice formed in the end wall at the second end of the body;

at least two castellations formed in an exterior surface of the end wall;

at least one slot disposed between the two castellations, each slot extending between a first sidewall of a first castellation and a second sidewall of a second castellation adjacent the first castellation at the second end of the body, each slot having a slot floor and an exterior shape, the torch tip having the following characteristics;

(c) a slope of the slot floor within the at least one slot tapers in an outward radial direction relative to the plasma exit orifice toward the first end of the body, and

(d) the exterior shape of the at least one slot has a generally U-shaped structure that extends between a first point on the first sidewall of the first castellation and a second point on the second sidewall of the second castellation.

20. The torch tip of claim 19 wherein the exterior shape of the at least one slot has a widened U-shaped structure, a hemispherical elliptical structure, an oval elliptical structure, or an elliptical structure.