Cost effective cartridge for a plasma arc torch

• US 10,462,891 B2
• Filed: 02/12/2016
• Issued: 10/29/2019
• Est. Priority Date: 08/12/2014
• Status: Active Grant

• Current Assignee: Hypertherm Incorporated
• Original Assignee: Hypertherm Incorporated
• Inventors: Zhang, Yu, Duan, Zheng, Esmaili, Mahyar, Kornprobst, Mike, Hansen, Brett, Quillia, Garrett
• Primary Examiner(s): Paschall, Mark H
• Application Number:
  US15/043,044
• Publication Number:
  US 20160165712A1
• Time in Patent Office: 1,355 Days
• Field of Search: 2191215, 21912151, 21912152, 21912148, 21912154, 21912157
• CPC Class Codes: B23K 10/02 Plasma welding
• CPC Class Codes: H05H 1/34 Details, e.g. electrodes, nozzles
• CPC Class Codes: H05H 1/3457 Nozzle protection devices
• CPC Class Codes: H05H 1/3468 Vortex generators
• CPC Class Codes: H05H 1/3489 Means for contact starting

Abstract

A crown for a plasma arc torch is provided. The crown includes a body defining a proximal and a distal end. The body includes an electrically conductive material. The crown also includes at least one raised feature at the proximal end of the body. The raised feature is adapted to activate a consumable sensor inside of the plasma arc torch. The crown further includes a biasing surface at the proximal end of the body for physically contacting a resilient element.

Claims

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

a body defining a distal end that is closest to a workpiece during an operation of the plasma arc torch and a proximal end opposite of the distal end, the distal end of the body disposed adjacent to and aligned with a proximal end of an electrode of the plasma arc torch;

at least one raised feature at the proximal end of the body, the raised feature adapted to depress a consumable sensor inside of the plasma arc torch to permit a flow of electrical current from a power supply; and

a surface of the body having one of (i) a depressed center to conduct the electrical current through the body, or (ii) an opening adapted to provide the electrical current to the electrode.

2. The crown of claim 1, wherein the surface comprises the depressed center and the crown further comprises:

a contact surface of the depressed center at the distal end of the body for physically contacting, during a transferred arc mode of the plasma arc torch, a corresponding surface of the electrode,

wherein the at least one raised feature is configured to activate the consumable sensor by pressing against the consumable sensor upon installation of the crown into the plasma arc torch, thereby permitting the flow of electrical current through the contact surface to the electrode during a transferred arc mode of the plasma arc torch.

3. The crown of claim 1, wherein the body of the crown is substantially hollow and configured to retain a resilient element between a biasing surface of the body and the electrode.

4. The crown of claim 1, wherein the body of the crown has a substantially uniform thickness.

5. The crown of claim 2, wherein the body of the crown defines a cavity configured to receive at least a portion of a cathode of the plasma arc torch.

6. The crown of claim 5, wherein the contact surface is located in an interior surface of the crown body defining the cavity.

16. The crown of claim 1 wherein the body includes an electrically conductive material.

7. A cartridge consumable of a multi-piece cartridge consumable for a plasma arc torch, the cartridge consumable comprising:

a crown defining a distal end that is closest to a workpiece during an operation of the plasma arc torch and a proximal end opposite of the distal end, the crown having one of a depressed center or an opening;

a swirl ring defining a distal end and a proximal end, the proximal end of the swirl ring disposed adjacent to and aligned with the distal end of the crown;

a nozzle fixedly connected to the swirl ring at the distal end of the swirl ring; and

an electrode disposed in a chamber defined by the crown, the swirl ring and the nozzle;

at least one of the crown, the electrode, the swirl ring or the nozzle comprising a raised feature extending proximally, the raised feature configured to depress a consumable sensor to permit a flow of electrical current from a power supply to the cartridge consumable.

8. The cartridge consumable of claim 7, wherein the crown physically contacts a cathode of the plasma arc torch and is disposed between the cathode and the electrode.

9. The cartridge consumable of claim 8, wherein the opening of the crown is configured to allow at least a portion of the cathode to pass therethrough to physically contact the electrode in a transferred arc mode of operating the plasma arc torch.

10. The cartridge consumable of claim 8, wherein the depressed center of the crown defines a recess configured to permit the cathode to extend within the cartridge consumable and conduct the electrical current through the crown.

11. The cartridge consumable of claim 7, wherein the cartridge consumable is substantially conductive.

12. The cartridge consumable of claim 7, wherein a portion of the swirl ring is adapted to extend through an opening in the crown to depress the consumable sensor inside of the plasma arc torch.

13. The cartridge consumable of claim 8, wherein a spring component is adapted to extend longitudinally and substantially parallel to the cathode upon installation of the multi-piece cartridge consumable in the plasma arc torch.

14. The cartridge consumable of claim 7, further comprising a retention feature disposed on a surface of the cartridge consumable for rotationally engaging and axially securing an outer cartridge consumable of the multi-piece cartridge consumable.

15. The cartridge consumable of claim 14, wherein the retention feature is disposed on a surface of at least one of the nozzle or the swirl ring.

17. A method of installing a cartridge into a plasma arc torch, the method comprising:

assembling the cartridge consumable of claim 7;

securing a torch head to the cartridge that includes the cartridge consumable being at least a portion of an inner component and an outer component;

depressing, by the raised feature, the consumable sensor that is located inside of the torch head of the plasma arc torch; and

establishing an electrical current flow path, including providing the flow of electrical current, from the power supply through the torch head and to the cartridge based on the depressing.

18. The method of claim 17, further comprising:

positioning the crown between a cathode of the torch head and the electrode; and

radially and longitudinally aligning the cathode, the crown and the electrode.

19. The method of claim 18, further comprising enabling physical mating between the cathode and a recess of the crown.

20. The method of claim 18, further comprising enabling physical contact between the cathode and the electrode via an opening of the crown during a transferred mode operation of the plasma arc torch.

21. The method of claim 17, further comprising:

physically contacting, by a biasing surface at the proximal end of the crown, a resilient element; and

physically contacting, by a contact surface at the distal end of the crown, a corresponding surface of the electrode during a transferred arc mode of the plasma arc torch.

22. The method of claim 21, further comprising permitting the flow of electrical current in the electrical current flow path through one of (i) the biasing surface to the resilient element during a pilot arc mode of the plasma arc torch or (ii) the contact surface to the electrode during the transferred arc mode.

23. The method of claim 17, further comprising:

disposing the cartridge consumable within a hollow body of an outer component, the cartridge consumable being at least a portion of an inner component; and

axially restraining the inner component relative to the outer component while permitting independent rotation of the inner and outer components relative to each other.

24. The method of claim 23, further comprising substantially suspending and radially orienting, by the axial restraining, a rear portion of the inner component within the hollow body of the outer component.

25. The method of claim 23, further comprising radially aligning the inner component with respect to the outer component by one or more fins disposed on a surface of at least one of the inner or outer component.

26. The method of claim 17, wherein the raised feature is disposed on the crown or the swirl ring.