Nozzle structure for plasma torch

Details Nozzle structure for plasma torch Nozzle structure for plasma torch

1993-05-14

1994-04-19

Paschall, Mark H.

Electric heating

Metal heating

By arc

21912148, 219 75, B23K 900, B23K 1000

Patent

active

053047702

ABSTRACT:
A plasma torch is provided with a sharply converging nozzle which can prevent the lower end of the torch from making contact with a workpiece which has concavities and convexities during the cutting of the workpiece with the plasma torch. An upper portion (1a) of the nozzle (1) is provided with an outwardly directed flange (1h) so as to make close contact with a seat surface (2d) formed in the inner periphery of the lower portion of the cap (2), so as to ensure electrical conduction between the nozzle (1) and the cap (2) and to secure to a torch body (8) the nozzle (1) and components (3, 4, 5) contained in the nozzle (1). O-rings (6, 6a, 9) provide seals for the cooling water passage (7). The lower end of cylindrical portion (1a) of the nozzle (1) below the flange (1f), as well as the conical portion (1b), constitutes part of the exterior surface of the plasma torch, while the apex angle (.theta..sub.1) of the nozzle structure is made smaller so that the nozzle structure is more sharply tapered.

REFERENCES:
patent: 3242305 (1966-03-01), Kane et al.
patent: 3632951 (1972-01-01), Klasson et al.
patent: 4579282 (1986-04-01), Navara et al.
patent: 4959520 (1990-09-01), Okada et al.
patent: 5013885 (1991-05-01), Carkhuff et al.

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