GASODYNAMIC METAL SPRAY GUN -THERMIC BREAKER Russian patent published in 2001 - IPC

FIELD: combination-type gas-jet tool having main working member in the form of supersonic gasodynamic jet. SUBSTANCE: apparatus according to invention is based upon group of constructional innovations and it may realize next technological operations: application of corrosion resistant, restoring and decorative coatings onto metallic surfaces and surfaces of building structures; high-efficiency sand-blast gasodynamic treatment of metal surface for removing from it corrosion products and slag; thermic breaking at manufacture of building granite. Gasodynamic apparatus providing increased thermic stresses and intensified heat and mass exchange in combustion chamber is realized in the form of combination type gasodynamic tool having three-duct manifold for transporting fuel, additional oxidizer and treating agent, combustion chamber, swirler and nozzle. Novelty is annular radial diffuser for feeding fuel to combustion chamber and for creating protective film on walls of combustion chamber due to swirling air stream at inlet of combustion chamber. At inlet of combustion chamber air stream has axial component Wx and tangential component Wt while sustaining relation Wx/Wt near wall of combustion chamber in range 1.2-1.7. Apparatus also includes holder-web for feeding through bin to zone of supersonic jet easy-to-melt metal with melting temperature lower than 1000 C. Bin is arranged near nozzle cut. It is also possible to feed powdered refractory metals along duct of manifold to combustion zone of combustion chamber while adding oxygen as oxidizer. EFFECT: improved design of apparatus, its enlarged functional possibilities and using range. 3 cl, 3 dwg