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US 2018/0020533 A1Published application
Nozzle for a plasma arc torch
AssigneeKjellberg-Stiftung
InventorsFrank LAURISCH, Volker KRINK, Timo GRUNDKE
Life of this patent
Estimating the term…
Abstract
Nozzle for a liquid-cooled plasma arc torch head, and an assembly of a nozzle holder and such a nozzle and plasma arc torch head, and a plasma arc torch with the same.
Claims22
A nozzle for a liquid-cooled plasma arc torch, comprising:
- a body (2) with an overall axial length L, an inner surface (2.20) and an outer surface (2.22), a front (2.24) and a rear end (2.26) and a nozzle opening (2.28) at the front end (2.24),
- wherein the outer surface (2.22) of the body (2), beginning at the rear end (2.26), has a substantially cylindrical first portion (2.1) with an axial length L1, in which at the rear end (2.26) of the body (2) there is a groove (2.10) extending optionally in the circumferential direction for an O-ring or with an O-ring disposed in it (2.42), which is delimited towards the rear end (2.26) of the body (2) by a projection (2.30) which defines an external diameter D11 of the body (2), and at the front end there is a centering surface (A11) for a nozzle holder (7) which defines an external diameter D12 of the body (2), and has a second portion (2.2) with an axial length L2 adjoining it towards the front end (2.24), which defines an axial stop face (B11) for a nozzle holder at the boundary to the first portion (2.1), which defines an external diameter D21 of the body (2) and tapers substantially conically, at least in a part-portion towards the front end (2.24) of the body (2),
- wherein:
- D12-D11≧1.5 mm
- and/or
- (D12-D11)/D12≧0.07.
3 more elements
A nozzle for a liquid-cooled plasma arc torch, comprising:
- a body (2) with an overall axial length L, an inner surface (2.20) and an outer surface (2.22), a front (2.24) and a rear end (2.26) and a nozzle opening (2.28) at the front end (2.24),
- wherein the outer surface (2.22) of the body (2), beginning at the rear end (2.26), has a substantially cylindrical first portion (2.1) with an axial length L1, in which at the rear end (2.26) of the body (2) there is a groove (2.10) extending optionally in the circumferential direction for an O-ring or with an O-ring disposed in it (2.42), which is delimited towards the rear end (2.26) of the body (2) by a projection (2.30) which defines an external diameter D11 of the body (2), and at the front end (2.24) there is a centering surface (A11) for a nozzle holder (7), which defines an external diameter D12 of the body (2), and has a second portion (2.2) with an axial length L2 adjoining it towards the front end (2.24), which defines an axial stop face (B11) for a nozzle holder (7) at the boundary to the first portion (2.1), which defines an external diameter D21 of the body (2) and tapers substantially conically, at least in a part-portion towards the front end (2.26) of the body (2),
- wherein for the length L12 of the distance between the axial stop face (B11) of the second portion (2.2) and the closest edge line (2.32) of the groove (2.10) and the length L13 of the distance between said edge line (2.32) and the rear end (2.26) of the body (2), the rule is
- L12/L13≧3,
- and/or
- wherein for the length L12 of the distance between the axial stop face (B11) of the second portion (2.2) and the closest edge line (2.32) of the groove (2.10) and the length L1 of the first portion (2.1), the rule is
- L12/L1≧0.75,
- and/or
- wherein the rule is
- D12/L1≦2.3.
7 more elements
Dependencies are inferred from the claim text.