Patent ID: 6179562
Filing Date: 2001-01-30
Classification: F04D,Y10S

Abstract:
A blower comprising an annular wall (2) formed to be spaced from blade tips of a fan (1), said annular wall (2) having slits (6) formed at a portion opposed to said blade tips to establish communication between inner and outer peripheral portions of said annular wall (2), so that air is sucked into the inner peripheral portion of said annular wall (2) from the outer peripheral portion of said annular wall (2) through said slits (6) as said fan (1) rotates, characterized in thatwhere the length of an air flow from the outer periphery of said annular wall (2) to the inner periphery thereof is taken as L, and the width of a gap of the slit at a distance l from the inner periphery of said slit (6) is taken as w(l), in order to substantially satisfy the condition expressed as ##EQU8##the width w(l) of the gap of said slit (6) is changed in radial and circumferential directions, whereby the quantity of air flowing into the inner peripheral portion of the annular wall from the outer peripheral portion of the annular wall through said slits (6) is made substantially equal over the entire circumference of the annular wall.