Protective nozzle cap, protective nozzle cap retainer, and arc plasma torch having said protective nozzle cap and or said protective nozzle cap retainer

• US 8,921,731 B2
• Filed: 08/04/2010
• Issued: 12/30/2014
• Est. Priority Date: 08/11/2009
• Status: Active Grant

• Current Assignee: Kjellberg Finsterwalde Plasma und Maschinen GmbH (Kjellberg-Stiftung)
• Original Assignee: Kjellberg Finsterwalde Plasma und Maschinen GmbH (Kjellberg-Stiftung)
• Inventors: Krink, Volker, Laurisch, Frank, Grundke, Timo, Kroschwald, Martin
• Primary Examiner(s): PASCHALL, MARK H
• Application Number:
  US13/390,234
• Publication Number:
  US 20120138580A1
• Time in Patent Office: 1,609 Days
• Field of Search: 219/121.5, 219/121.51, 219/121.48, 219/121.49, 219/74, 219/75, 313/231.51, 315/111.51
• US Class Current: 219/121.5
• CPC Class Codes: H05H 1/28 Cooling arrangements
• CPC Class Codes: H05H 1/34 Details, e.g. electrodes, nozzles
• CPC Class Codes: H05H 1/3457 Nozzle protection devices

Abstract

A nozzle protection cap for an arc plasma torch comprises a front end section and a rear end section with a thread region on its inner surface for screwing to a torch body of an arc plasma torch. At least one groove crosses the thread region on the inner surface. A nozzle protection cap holder for the arc plasma torch comprises a section with a thread region on its outer surface for screwing to the nozzle protection cap. At least one groove crosses the thread region on its outer surface. An arc plasma torch comprises a torch body and a nozzle protection cap screwed thereto in a screw connection region. The torch body and/or the nozzle protection cap is/are designed so that at least one channel is formed between them, the channel crossing the screw connection region.

Claims

1. A nozzle protection cap, having a longitudinal axis, for an arc plasma torch comprising:

a front end section and a rear end section, said rear end section having an inner surface and a thread region on said inner surface for screwing into a torch body of an arc plasma torch;

at least one groove crossing said thread region obliquely to said longitudinal axis of said nozzle protection cap; and

said at least one groove crossing in the manner of a screw said thread region on said inner surface.

2. The nozzle protection cap of claim 1 wherein said thread region is designed to screw into the torch body via a nozzle protection cap holder.

3. The nozzle protection cap of claim 1 further comprising:

said nozzle protection cap having a longitudinal axis; and

said at least one groove crossing said thread region parallel to said longitudinal axis of said nozzle protection cap.

4. The nozzle protection cap of claim 1 having a two-part construction.

5. A nozzle protection cap holder, having a longitudinal axis, for an arc plasma torch comprising:

a section having an outer surface;

a thread region on said outer surface for screwing to a nozzle protection cap of an arc plasma torch;

at least one groove crossing said thread region obliquely to said longitudinal axis of said nozzle protection cap; and

said at least one groove crossing in the manner of a screw said thread region on said outer surface.

6. The nozzle protection cap holder of claim 5 further comprising:

said nozzle protection cap having a longitudinal axis; and

said at least one groove crossing said thread region parallel to said longitudinal axis of said nozzle protection cap.

7. An arc plasma torch comprising:

a torch body;

a screw connection region;

a nozzle protection cap, having a longitudinal axis, screwed into said screw connection region, said nozzle protection cap having a front end section and a rear end section, said rear end section having an inner surface and a thread region on said inner surface for screwing into said torch body at said screw connection region;

at least one groove crossing said thread region obliquely to said longitudinal axis of said nozzle protection cap;

said at least one groove crossing in the manner of a screw said thread region on said inner surface; and

at least one channel is formed between said torch body and said nozzle protection cap, said channel crossing said screw connection region.

8. The arc plasma torch of claim 7 wherein said nozzle protection cap is screwed in said screw connection region via a nozzle protection cap holder into said torch body.

9. The arc plasma torch of claim 8 wherein said nozzle protection cap has a two-part construction.

10. The arc plasma torch of claim 8 wherein said nozzle protection cap holder further comprises:

a section having an outer surface;

a thread region on said outer surface for screwing into said nozzle protection cap; and

at least one groove, said at least one groove crossing said thread region on said outer surface.

11. The arc plasma torch of claim 8 further comprising:

said nozzle protection cap having a longitudinal axis; and

said at least one groove crossing said thread region parallel to said longitudinal axis of said nozzle protection cap.

12. The arc plasma torch of claim 8 wherein said at least one channel is formed from a groove in at least one of said torch body, said nozzle protection cap holder, and said nozzle protection cap.

13. The arc plasma torch of claim 7 wherein said channel is a secondary medium channel.

14. The arc plasma torch of claim 13 wherein said secondary medium channel is a secondary gas channel.

15. The arc plasma torch of claim 13 wherein a secondary medium inlet channel is provided in said torch body, said secondary medium inlet channel being connected to said secondary medium channel.

16. The arc plasma torch of claim 7 further comprising:

said nozzle protection cap is screwed in said screwed connection region, via a nozzle protection cap holder, into said torch body; and

a secondary medium inlet channel is provided in said nozzle protection cap holder, said secondary medium inlet channel being connected to said secondary medium channel.