METHOD FOR MECHANICAL TREATMENT, MAINLY STONE FACING, OF BUILDINGS AND DEVICE FOR PRODUCTION OF HOT GASEOUS WORKING MEDIUM IN THE FORM OF SUPERSONIC STREAM USED IN THE METHOD

摘要

treatment and cleaning of facing surfaces of buildings, structures and various objects in construction and other fields of national economy. SUBSTANCE: the method consists in the fact that at a continuous feed of compressed air to the transportation flow solid particles of the working medium continuously form a suspension. The suspension is fed to the working member in the form of a nozzle in which it is influenced by an auxiliary flow of hot gaseous working medium in the form of a supersonic stream. The hot gaseous working medium, simultaneously with transfer of kinetic energy to suspended solid articles of the working medium, warms up and expands air in the suspension. Due to the excess of temperature of gaseous working medium relative to the suspension, the rate of flow and speed in the nozzle increases by hundreds of times and initiate the supersonic speed of outflow acting on the building stone facing. The device for production of hot gaseous working medium in the form of a supersonic stream has a body accommodating a combustion chamber, prechamber and concentrically positioned main and auxiliary air flow swirlers, injector and homogenizer of fuel-air mixture. The body is positioned in a housing enveloping it with formation of a cooling cavity. Installed on the outlet end of the body is a replaceable nozzle formed by a contraction and diffuser. The housing cooling cavity is connected through the swirler to the compressed air source and communicates with the combustion chamber. Ignition of liquid fuel is provided by an electric spark discharge initiated by the glow plug electrodes. EFFECT: enhanced rate of surface treatment and simultaneous reduction of consumption of working medium and provision of adjustment within a wide range of the rate of surface treatment and consumption of working medium. 4 cl, 3 dwg