Fluid sprinkling – spraying – and diffusing – With means fusing solid spray material at discharge means – Wire or rod type supply
Patent
1986-12-23
1988-11-15
Kashnikow, Andres
Fluid sprinkling, spraying, and diffusing
With means fusing solid spray material at discharge means
Wire or rod type supply
239 85, 239390, 2394193, 2394245, 239427, 239600, B05B 124
Patent
active
047843217
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
The invention relates to a flame spray torch for use with spraying materials in powder or wire form, with a torch body and a torch head, the torch body having supply means for the spraying material as well as for a combustion gas and an oxidation gas and the torch head having a nozzle part provided with a plurality of gas nozzle channels and at least one channel for the spraying material, the nozzle part being exchangeably connected with the torch body.
DESCRIPTION OF THE PRIOR ART
Flame spray torches of this kind for spraying materials in powder form are known for example from the German Pat. No. 1 646 027. The arrangement described therein comprises an annular mixing chamber in the torch body to which on the one hand combustion gas is supplied from a common supply duct and in which end, on the other hand, are found several supply ducts for the oxidation gas. The mixing chamber has in this device a comparatively large volume due to which a return of the flame or a backfiring up to the mixing chamber may have very serious consequences, a flame return or backfiring being not entirely avoidable in such a torch as appeared in practice.
Furthermore, in such a known torch structure changing the flame energy is rather difficult and requires the assistance of a specialist to warant the required safety when exchanging the mixing device. This renders an adaptation to the use of spraying materials of different kinds rather problematic.
A further important disadvantage of such a torch consists in the fact that it cannot be adapted or that it is very difficult to adapt to the regulations existing in various countries with respect to the maximum admissible combustion gas pressure, since the necessary suction power in the injector requires a velocity of the oxidation gas which is already within the critical range.
Furthermore, in a torch of the known type the flame profile is predetermined as a whole and is not adaptable to individual application cases.
In order to reduce as much as possible the effects of a backfiring it has been proposed on the other hand to mix the gases only in the nozzle part. However, in such a torch the extent of mixing is not satisfactory since the gas path following the mixing is too short and since there is also no possibility to improve the extent of mixing by constructive means. It is therefore not possible to use the optimum flame velocity in such a torch and the irregularity of the individual flame cones affects the quality of the sprayed layers.
SUMMARY AND OBJECTS OF THE INVENTION
It is an object of the invention to eliminate the above-mentioned drawbacks of the known torches and to provide in particular a flame spray torch which can be adapted easily and without problem by the operator himself to the most different spraying conditions and application cases, in particular with regard to the torch power, thus allowing for reaching optimum spraying results and to warrant a substantially improved safety in operation.
According to the invention this is obtained by the fact that the torch body has longitudinal recesses which are accessible from the side where the connection with the nozzle part takes place for receiving at least two exchangeable combustion gas--oxidation gas--injectors, and for each injector a respective supply duct for the combustion gas and a respective supply duct for the oxidation gas which supply ducts communicate with the corresponding inlet ducts of the injector.
Preferably, the injectors inserted in the recesses of the torch body project in part out of the torch body and the nozzle part has on its side recesses for receiving the injector portions which project from the torch body.
BRIEF DESCRIPTION OF THE DRAWINGS
FIG. 1: A general view of a flame spray torch according to the invention;
FIG. 2: A half axial section of the front part of the torch body and of the nozzle part of the flame spray torch of FIG. 1;
FIG. 3: A section along line III--III of FIG. 2;
FIG. 4: A part axial section of a torch head according to a modified embodi
REFERENCES:
patent: 1114706 (1914-10-01), Brousseau
patent: 2544259 (1951-03-01), Duccini et al.
patent: 2643955 (1953-06-01), Powers et al.
patent: 4363443 (1982-12-01), Huehne
patent: 4646968 (1987-03-01), Sablatura et al.
Castolin S.A.
Forman Michael J.
Kashnikow Andres
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