POWER PLANT VENTILATION SYSTEM Russian patent published in 2002 - IPC

FIELD: mechanical engineering; cooling and ventilating systems. SUBSTANCE: invention relates to ventilation cooling systems of power plants with open air duct design peculiarities of which are lacks of conditions for organizing axially symmetric air flow at ventilation plant impeller and sufficient columns of engine-transmission compartments for building full-profile devices discharging air into atmosphere. According to invention, in cooling system including rack with radiators and ventilation plant installed with tilting in stern part of engine-transmission compartment in curvilinear section of suction circuit with upper arrangement of radiators and provision of screening members at air inlet into ventilation plant consisting of centrifugal impeller with backward-curved blades with relative diameter of inlet Dr/D= 0.85-0.875; inlet guide vane assembly in form of fixed segment grid with central angle of 180-120^o installed in upper part of ventilation plant and welded of three guide rings-hyperboloids of revolution of one nape whose imaginary axes coincide with axis of impeller rotation, ratios of diameters of necks of circumferences to outer diameter D of impeller is, respectively, 0.8-0.82, 0.74-0.75, 0.62-0.64, trailing edge of grid upper ring is made with diameter equal to maximum diameter of blade leading edges and curvilinear channels are made with constant section with ratio of upper channel-to-lower passage area being 1: 2; ventilation plant housing of constant B with incomplete opening of scroll, stepped diffuser at outlet, and ratio of areas of housing outlet section to inlet section of ventilation plant being 1.3-1.35, trailing edges of blades of centrifugal impeller are curved to side of impeller rotation of section of relative length L=L/D= 0.05-0.075 from trailing edges with preservation of outlet angle equal to <90^°; ratio of width of impeller b₂ to outer diameter D of impeller is maintained equal to b₂/D = 0,19...0,23, and ratio of width of impeller b₂ to width B of housing is equal to b₂/B = 0,51...0,58. EFFECT: 12% increase in ventilation plant capacity, rise of static efficiency of ventilation plant from 16-18 to 24%. 1 tbl, 1 dwg