CA2409405A1 - Control system for a gas flow to a plasma arc torch - Google Patents

Control system for a gas flow to a plasma arc torch Download PDF

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Publication number
CA2409405A1
CA2409405A1 CA002409405A CA2409405A CA2409405A1 CA 2409405 A1 CA2409405 A1 CA 2409405A1 CA 002409405 A CA002409405 A CA 002409405A CA 2409405 A CA2409405 A CA 2409405A CA 2409405 A1 CA2409405 A1 CA 2409405A1
Authority
CA
Canada
Prior art keywords
gas
flow
secondary gas
plasma arc
oxidizing
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
CA002409405A
Other languages
French (fr)
Other versions
CA2409405C (en
Inventor
Richard W. Couch Jr.
Nicholas A. Sanders
Lifeng Luo
John Sobr
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Hypertherm Inc
Original Assignee
Individual
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Priority claimed from US07/682,992 external-priority patent/US5166494A/en
Priority claimed from US07/682,991 external-priority patent/US5170033A/en
Priority claimed from US07/753,395 external-priority patent/US5396043A/en
Application filed by Individual filed Critical Individual
Publication of CA2409405A1 publication Critical patent/CA2409405A1/en
Application granted granted Critical
Publication of CA2409405C publication Critical patent/CA2409405C/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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  • Plasma Technology (AREA)
  • Arc Welding In General (AREA)

Abstract

A plasma arc torch (10) has a secondary gas flow (46) that is extremely large during piercing of a workpiece (36). The secondary flow (46) exits the torch immediately adjacent the transferred plasma arc (34) and is an extremely uniform, swirling flow. A
swirl ring (60) is located in the secondary gas flow path (50) at the exit point. A prechamber (58) feeds gas to the swirl ring (60), which is in turn fed through a flow restricting orifice (56). For certain applications the secondary gas (46) is a mixture of an oxidizing gas and a non-oxidizing gas in a flow ratio of oxydizing to non-oxidizing in the range of 2:3 to 9:1. A network (44) of conduits and solenoid valves (SV1-SV17) operated under the control of a central microprocessor (90) regulates the flows of plasma gas (42) and secondary gas (46) and mixes the secondary gas (46). The network (44) includes valued parallel branches (78,80,84,86) that provide a quick charge capability and a set of venting valves.(SV11-SV14), also electrically actuated by the microprocessor (90), to provide a quick discharge. In a preferred high-definition embodiment, a nozzle (28) with a cut back outer surface and a large, conical head (28b) allows a metal seal and enhanced cooling.
CA002409405A 1991-04-12 1992-03-09 Control system for a gas flow to a plasma arc torch Expired - Lifetime CA2409405C (en)

Applications Claiming Priority (7)

Application Number Priority Date Filing Date Title
US682,992 1991-04-12
US07/682,992 US5166494A (en) 1990-04-24 1991-04-12 Process and apparatus for reducing electrode wear in a plasma arc torch
US682,991 1991-04-12
US07/682,991 US5170033A (en) 1990-04-24 1991-04-12 Swirl ring and flow control process for a plasma arc torch
US753,395 1991-08-30
US07/753,395 US5396043A (en) 1988-06-07 1991-08-30 Plasma arc cutting process and apparatus using an oxygen-rich gas shield
CA002108121A CA2108121C (en) 1991-04-12 1992-03-09 Plasma arc cutting process and apparatus using an oxygen-rich gas shield

Related Parent Applications (1)

Application Number Title Priority Date Filing Date
CA002108121A Division CA2108121C (en) 1991-04-12 1992-03-09 Plasma arc cutting process and apparatus using an oxygen-rich gas shield

Publications (2)

Publication Number Publication Date
CA2409405A1 true CA2409405A1 (en) 1992-10-29
CA2409405C CA2409405C (en) 2007-02-27

Family

ID=35170029

Family Applications (3)

Application Number Title Priority Date Filing Date
CA002409405A Expired - Lifetime CA2409405C (en) 1991-04-12 1992-03-09 Control system for a gas flow to a plasma arc torch
CA002409409A Expired - Lifetime CA2409409C (en) 1991-04-12 1992-03-09 Nozzle for a plasma arc torch
CA002409420A Expired - Lifetime CA2409420C (en) 1991-04-12 1992-03-09 Plasma arc cutting process and apparatus using an oxygen-rich gas shield

Family Applications After (2)

Application Number Title Priority Date Filing Date
CA002409409A Expired - Lifetime CA2409409C (en) 1991-04-12 1992-03-09 Nozzle for a plasma arc torch
CA002409420A Expired - Lifetime CA2409420C (en) 1991-04-12 1992-03-09 Plasma arc cutting process and apparatus using an oxygen-rich gas shield

Country Status (1)

Country Link
CA (3) CA2409405C (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110315177A (en) * 2019-08-06 2019-10-11 河北瓦尔丁科技有限公司 Plasma power supply torch head accelerates gas path device

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110315177A (en) * 2019-08-06 2019-10-11 河北瓦尔丁科技有限公司 Plasma power supply torch head accelerates gas path device

Also Published As

Publication number Publication date
CA2409420A1 (en) 1992-10-29
CA2409420C (en) 2005-09-20
CA2409409A1 (en) 1992-10-29
CA2409409C (en) 2006-05-16
CA2409405C (en) 2007-02-27

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