Title:
【発明の名称】プラズマアーク電極を冷却するための装置及び方法
Document Type and Number:
Japanese Patent JP2568126
Kind Code:
B2
Abstract:
In a plasma arc torch, an electrode is movable axially into and out of electrical connection with an anode, typically a nozzle secured to one end of a torch body. A flow of pressurized plasma gas is directed to a plasma chamber between the electrode and the nozzle, preferably through a replaceable swirl ring that closely surrounds and guides the electrode at a larger diameter shoulder portion of the electrode. A gas flow passage, preferably a spiral passage machined on the outer side surface of the shoulder portion, diverts a portion of the gas flow from the plasma chamber to a region above the electrode where it is vented to atmosphere. The passage is sufficiently constricted that a substantial pressure drop appears along the path, while at the same time allowing a sufficient flow to produce the desired cooling. The revolutions of the spiral are preferably closely spaced to enhance the surface area of the electrode in a heat transfer relationship with the cooling gas flow.
Inventors:
SANDAAZU NIKORASU EI
KUUCHI JUNIA RICHAADO DABURYUU
KUUCHI JUNIA RICHAADO DABURYUU
Application Number:
JP50526689A
Publication Date:
December 25, 1996
Filing Date:
April 27, 1989
Export Citation:
Assignee:
HYPERTHERM INC
International Classes:
B23K9/00; B23K9/067; B23K9/29; B23K10/00; H05H1/28; H05H1/32; H05H1/34; H05H1/38; (IPC1-7): B23K10/00; B23K10/00; H05H1/28
Domestic Patent References:
| JP6390371A | ||||
| JP2501904A |
Other References:
【文献】米国特許4777343(US,A)
Attorney, Agent or Firm:
Motohiro Kurauchi (1 outside)