Cartridge for a liquid-cooled plasma arc torch

Patent metadata

Field	Value
Publication number	US-10561009-B2
Application number	US-201615228813-A
Country	US
Kind code	B2
Filing date	Aug 4, 2016
Priority date	Aug 4, 2015
Publication date	Feb 11, 2020
Grant date	Feb 11, 2020

Abstract

A liquid-cooled consumable cartridge for a plasma arc torch is provided. The cartridge includes (i) an electrode, (ii) a swirl ring with a first outer retaining feature and a second outer retaining feature on an exterior surface, where the electrode is secured to the swirl ring, and (iii) a nozzle with an inner retaining feature on an interior surface, where the inner retaining feature of the nozzle is mated with the first outer retaining feature of the swirl ring. The cartridge also includes a cartridge frame with an inner retaining feature on an interior surface and an outer retaining feature on an exterior surface. The inner retaining feature of the cartridge frame is mated with the second outer retaining feature of the swirl ring. The cartridge further includes a shield with an inner retaining feature on an interior surface mated with the outer retaining feature of the cartridge frame.

First claim

What is claimed is:

1. A liquid-cooled consumable cartridge for a plasma arc torch, the cartridge comprising:
an electrode;
a swirl ring with a first outer retaining feature and a second outer retaining feature on an exterior surface, wherein the electrode is secured to the swirl ring;
a nozzle with an inner retaining feature on an interior surface, wherein the inner retaining feature of the nozzle is mated with the first outer retaining feature of the swirl ring;
a cartridge frame with an inner retaining feature on an interior surface and an outer retaining feature on an exterior surface, wherein the inner retaining feature of the cartridge frame is mated with the second outer retaining feature of the swirl ring; and
a shield with an inner retaining feature on an interior surface mated with the outer retaining feature of the cartridge frame,
wherein the cartridge frame comprises at least one liquid flow path disposed therein, the liquid flow path being radially offset from a central longitudinal axis of the cartridge frame.

2. The liquid-cooled consumable cartridge of claim 1 , wherein the electrode and the nozzle are axially and radially aligned relative to each other without physical contact between the electrode and the nozzle.

3. The liquid-cooled consumable cartridge of claim 1 , wherein the nozzle and the shield are axially and radially aligned relative to each other without physical contact between the nozzle and the shield.

4. The liquid-cooled consumable cartridge of claim 1 , wherein at least one of the shield, the nozzle, or the swirl ring mates directly with the cartridge frame.

5. The liquid-cooled consumable cartridge of claim 1 , wherein the electrode is indirectly mated with the cartridge frame via at least one of the swirl ring or an electrode insulator.

6. The liquid-cooled consumable cartridge of claim 1 , wherein mating between the inner retaining feature of the nozzle and the first outer retaining feature of the swirl ring radially aligns the nozzle with the swirl ring.

7. The liquid-cooled consumable cartridge of claim 1 , wherein mating between the inner retaining feature of the cartridge frame and the second outer retaining feature of the swirl ring provides at least one of axial or radial alignment between the cartridge frame and the swirl ring.

8. The liquid-cooled consumable cartridge of claim 1 , wherein mating between an inner retaining feature of the shield and the outer retaining feature of the cartridge frame provides at least one of axial or radial alignment between the cartridge frame and the shield.

9. The liquid-cooled consumable cartridge of claim 1 , wherein the cartridge frame further comprises a second inner retaining feature on the interior surface configured to be mated with an outer retaining feature on an outer surface of the nozzle, the mating between the cartridge frame and the nozzle provides at least one of axial or radial alignment between the cartridge frame and the nozzle.

10. The liquid-cooled consumable cartridge of claim 1 , wherein the nozzle is a non-vented nozzle coupled to a nozzle jacket.

11. The liquid-cooled consumable cartridge of claim 1 , wherein the nozzle is a vented nozzle coupled to a nozzle liner.

12. The liquid-cooled consumable cartridge of claim 1 wherein the consumable cartridge is composed of at least 50% non-conductive material by volume.

13. The consumable cartridge of claim 12 , wherein the consumable cartridge is composed of about 60% to about 80% non-conductive material by volume.

14. The consumable cartridge of claim 12 , wherein the consumable cartridge is a single use cartridge.

15. The consumable cartridge of claim 12 , wherein the shield, nozzle, swirl ring and electrode are not individually disposable after being affixed to the cartridge frame.

16. A method of manufacturing the consumable cartridge of claim 1 , the method comprising:
axially and radially securing the electrode to the swirl ring;
axially and radially securing the first or second outer retaining feature of the swirl ring to at least one of the inner retaining feature of the cartridge frame or the nozzle; and
axially and radially securing the outer retaining feature of the cartridge frame to the inner retaining feature of the shield.

17. The method of claim 16 , wherein axially and radially securing the electrode to the swirl ring comprises:
axially and radially securing the electrode to an electrode insulator; and
axially and radially securing the electrode insulator to the swirl ring.

18. The method of claim 16 , further comprising radially aligning a plasma gas channel within the cartridge frame with a gas passage between the swirl ring and the nozzle.

19. The method of claim 16 , further comprising radially aligning a shield gas channel within the cartridge frame with a gas passage between the nozzle and the shield.

20. The method of claim 16 , further comprising radially aligning a central channel within the cartridge frame with the electrode.

21. The method of claim 16 , further comprising:
radially aligning a first coolant channel and a second coolant channel within the cartridge frame with the nozzle; and
radially aligning a third coolant channel and a fourth coolant channel within the cartridge frame with the shield.

22. The method of claim 16 , further comprising forming the swirl ring through die cast using zinc.

23. The method of claim 16 , further comprising forming the cartridge frame through molding using a non-conductive material.

24. The method of claim 16 , further comprising forming the shield through stamping using a conductive material.

25. The method of claim 16 , wherein the axial and radial securing of the cartridge frame, electrode, swirl ring, nozzle and shield is through one or more of snap fit, press fit or interference fit.

26. A liquid-cooled consumable cartridge for a plasma arc torch, the cartridge comprising:
an electrode;
a swirl ring with an outer retaining feature on an exterior surface and an inner retaining feature on an interior surface, wherein the electrode is secured to the inner retaining surface of the swirl ring;
a nozzle with an outer retaining feature on an outer surface;
a cartridge frame with a first inner retaining feature and a second inner retaining feature on an interior surface and an outer retaining feature on an exterior surface, wherein the first inner retaining feature of the cartridge frame is mated with the outer retaining feature of the swirl ring and wherein the second inner retaining feature of the cartridge frame is mated with the outer retaining feature of the nozzle; and
a shield with an inner retaining feature on an interior surface mated with the outer retaining feature of the cartridge frame,
wherein the cartridge frame comprises at least one coolant channel opening being radially non-concentric relative a central longitudinal axis of the consumable cartridge, the coolant channel opening being in fluid communication with at least one of the nozzle or shield upon mating of the nozzle, the swirl ring, the cartridge frame and the shield to deliver a coolant flow to the nozzle or shield.

Assignees

• Hypertherm Inc

Inventors

• Sanders Nicholas A
• Shipulski E Michael

Classifications

• B23K9/285

  Cooled electrode holders · CPC title

• G06K19/07773

  Antenna details (antennas for wireless devices, e.g. RFID tags, in general H01Q1/22) · CPC title

• H05H1/28 Primary

  Cooling arrangements · CPC title

• H05H1/36

  Circuit arrangements (H05H1/38, H05H1/40 take precedence) · CPC title

• H05H1/3405 Primary

  Arrangements for stabilising or constricting the arc, e.g. by an additional gas flow · CPC title