SUPERSONIC BURNER FOR GAS FLAME SPRAY-DEPOSITION OF COATINGS Russian patent published in 1995 - IPC

FIELD: installation for spray deposition of coatings. SUBSTANCE: nozzle has the form of a circular aerodynamic nozzle with a flat profiled central body whose internal space is in communication with the powder supply line and the region adjoining the external surface of the profiled portion of the central body. The longitudinal axis of each fuel supply channel may lie in a plane tangent to the circle perpendicular to the longitudinal axis of the combustion chamber and form an angle other than he right angle with said axis. The outer end of the nozzle head opposite the inlet portions of the fuel channels may have two circular grooves communicating with said inlet portions. Said grooves are tightly sealed by covers and form two circular collector channels one of which communicates with the fuel supply system while the other one, with the oxidant supply system. The internal space of the central body may communicate with the space adjoining the external surface of the profiled portion of the central body through holes in its side wall, preferably on the supercritical portion of the nozzle and has the form of a longitudinal through channel. The burner may have a pipe branch and a pipe disposed therein and extending beyond the limits of the branch pipe. At one end said branch pipe is tightly secured on the pipe at the side opposite the central body. The injector head has the form of a circular disc fitting around the branch pipe and secured to its middle portion while the central body is a hollow shell enveloping the branch pipe and forming a circular gap therebetween, communicated in a spaced relation through the nonfastened end of the branch pipe. The ends of the shell are secured on one of the protruding ends of the pipe and on the injector head and can be made integral with it. The wall of the combustion chamber and the subsonic portion of the nozzle are preferably made in the form of internal, intermediate and external shells arranged so as to form an inlet slotted duct between the internal and intermediate shells, said duct being connected to the cooling liquid supply system and an outlet slotted duct between the intermediate and external shells, said duct being connected to the cooling liquid outlet system. One end of the shells is secured to the injector head while the other one interconnects the inlet and outlet slotted ducts through the nonfastened end of the intermediate shell, forming a combustion chamber cooling duct. The injector head may be provided with circular collector recesses on the periphery and opposite the branch pipe, said recesses being interconnected by radial channels so that one of the recesses communicates with the coolant supply system and the other one, with the coolant outlet system. As an alternative, the peripheral circular recess may communicate with the inlet slotted duct and the other one, with the circular slot. The fuel supply channels may then be disposed between the radial channels. The injector head may also be made of two parts of which the first one has the form of a disc with a cylindrical channel coaxial with the disc and the second one, the form of a cylindrical bushing with flanges, inserted into the through channel. The internal, intermediate and external shells are secured on the first portion which also accommodates circular collector recesses and radial channels and the branch pipe is secured on the cylindrical bushing. The collector recess communicating with the circular gap is sealed on the cylindrical bushing by circular seals disposed on both sides of the collector recess. The branch pipe can also be made integral with the cylindrical bushing EFFECT: higher acceleration velocity of the powder particles injected into the stream of the combustion products at a minimum energy losses.