Combustion – Frictional – chemical or percussive type igniter
Patent
1990-05-08
1991-12-03
Yeung, James C.
Combustion
Frictional, chemical or percussive type igniter
431269, 431 48, 266225, 102205, F23Q 100
Patent
active
050696165
DESCRIPTION:
BRIEF SUMMARY
The present invention relates to a lance ignition device, used with lances of the kind which are intended for supplying gaseous oxygen to metallurgical processes, the device including a tubular casing which is intended to be fitted to one end of a lance and which carries a striker equipped with a pyrotechnical delay which extends into the casing, and further including a reaction mass located in the casing and intended for ignition by the striker.
Ignition devices essentially of this kind are known to the art. One serious problem with these known devices resides in the prevention of mechanical activation of the reaction mass and of the striker by the lance, and also in ensuring that the reaction mass and the striker will not be dislodged from the casing when fitting the device to the lance. The known devices are also vulnerable in other respects. For instance, the striker or corresponding device is liable to fractural damage or some corresponding damage, resulting in the formation of discontinuities and therewith causing an initiated ignition process to abort. Unless properly controlled, the reinstatement of an aborted ignition sequence can result in uncontrolled ignition of the oxygen gas and therewith constitute a serious safety risk. These problems are, of course, particularly accentuated in such industrial environments as those in which the working tempo is particularly high and the handling of this kind of material is, perhaps, clumsily carried out.
The present invention relates to an ignition device which substantially eliminates the above mentioned problems and which, in other respects, is constructed in a particularly suitable manner.
The present invention thus relates to an ignition device which is intended for lances, such as those intended for supplying oxygen gas to metallurgical processes, and which device comprises a hollow tubular casing which is intended to be fitted partially onto one end of the lance and the end part of which device, remote from the lance, carries a striker having a pyrotechnical delay which extends into the casing, and which further comprises a reaction mass which is located in the tubular casing and is capable of being ignited by the striker.
The inventive ignition device is particularly characterised by an end stop which is mounted in the tubular casing at a location adjacent the reaction mass and against which one end of the lance is intended to be brought.
The invention will now be described in more detail with reference to an exemplifying embodiment thereof illustrated in the accompanying drawing, in which:
FIG. 1 illustrates schematically a first embodiment of an inventive device, where half of the tubular casing has been removed and the device is seen perpendicularly to the direction of its axis.
In FIG. 1, the reference 1 identifies a substantially tubular and cylindrical casing, which is preferably made of steel. The casing is intended to be fitted partially onto a lance end portion 2, shown in broken lines, the casing having an open end 3 for this purpose. The casing end 4, which is intended to be distal from the lance 2, carries a striker 5 for ignition of a reaction mass 7 located in the casing, through a pyrotechnical delay 6 extending into the casing.
The reference 8 identifies a substantially band-like metal strip which extends from the open end 3 of the casing through which the lance end is inserted and terminates essentially adjacent but not engaging the reaction mass, at which location a part 9 of the strip or band extends substantially at right angles to the long axis of the casing such as to form an end stop 9.
In the case of the illustrated embodiment, the strip 8 is attached to the open end 3 of the casing by means of a bent back, substantially U-shaped end clip 10, which embraces an edge part 3' of the casing open end 3.
In the case of its preferred embodiment, the metal strip 8 extends from a bent back clip part 10, clipped to the edge 3' of casing end 3, and extends through a small angle bend inwardly towards the centre axis of said casing and the
REFERENCES:
patent: 2634196 (1953-04-01), Pennecot
patent: 3507230 (1970-04-01), Seib
patent: 4915618 (1990-04-01), Brandin
Oxy-Tuben AB
Yeung James C.
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