초록 ▼

Specifications of the impeller and the scroll type casing of a multiblade radial fan comprising an impeller having numerous radially directed blades circumferentially spaced from each other and a scroll type casing accommodating the impeller are determined so as to make divergence angle of the scrol

Specifications of the impeller and the scroll type casing of a multiblade radial fan comprising an impeller having numerous radially directed blades circumferentially spaced from each other and a scroll type casing accommodating the impeller are determined so as to make divergence angle of the scroll type casing substantially coincide with divergence angle of the free vortex formed by the air discharged from the impeller.

대표청구항 ▼

[ We claim:] [23.] A method for driving an impeller of a multiblade radial fan, comprising the step of driving the impeller so as to make a flow coefficient .phi. equal toEQU 0.295.epsilon.(1-nt/(2.pi.r)).xi..sup.1.641 re 0.75.ltoreq..epsilon..ltoreq.1.25, n=a number of the radially directed blades,

[ We claim:] [23.] A method for driving an impeller of a multiblade radial fan, comprising the step of driving the impeller so as to make a flow coefficient .phi. equal toEQU 0.295.epsilon.(1-nt/(2.pi.r)).xi..sup.1.641 re 0.75.ltoreq..epsilon..ltoreq.1.25, n=a number of the radially directed blades, t=a thickness of the radially directed blades, r=an outside radius of the impeller, .xi.=a diameter ratio of the impeller.