초록 ▼

The rotor (1) of the fan is surrounded by a casing (5) having inlet and outlet sections (6, 8) interconnected by an enlarged intermediate section (7) defined between and end wall (10) located upstream of the rotor and an end wall (11) axially disposed between the leading and trailing blade edges (12

The rotor (1) of the fan is surrounded by a casing (5) having inlet and outlet sections (6, 8) interconnected by an enlarged intermediate section (7) defined between and end wall (10) located upstream of the rotor and an end wall (11) axially disposed between the leading and trailing blade edges (12, 13). The annular chamber (9) defined within the intermediate section (7) is subdivided into a plurality of compartments (25) by means of guide vanes (14), the innermost edge zones of which are inclined towards the direction of rotation of the rotor and include an angle of 40°to 65°with a radius to the rotor axis (3). The guide vanes (14) are preferably curved such that they meet the peripheral wall (15) of the annular chamber (9) at right angles. Preferably the inner edges of the guide vanes (14) are interconnected by a ring (22) located midway between the upstream and downstream end walls (10, 11) of the annular chamber (9), and the end portions (19) of the innermost vane edges located between the upstream end wall (10) and the ring (22) are preferably outwardly retracted relative to the remainder (18) of each edge.

대표청구항 ▼

An axial flow fan comprising; a rotor adapted to rotate in a predetermined direction about an axis and having a hub and a plurality of rotor blades each of which extends radially outwards from the hub and terminates in a blade tip, each rotor blade having a leading and a trailing edge; a casing coax

An axial flow fan comprising; a rotor adapted to rotate in a predetermined direction about an axis and having a hub and a plurality of rotor blades each of which extends radially outwards from the hub and terminates in a blade tip, each rotor blade having a leading and a trailing edge; a casing coaxially surrounding the rotor and including an inlet section having a downstream end located upstream of the rotor blades, an outlet section of substantially the same diameter as the inlet section and having an upstream end located in a plane extending normally to the rotor axis intermediate the leading and trailing edges of the rotor blades, and an intermediate section connecting the inlet and outlet sections and having a larger diameter than those sections, said intermediate section being defined by a peripheral wall and two end walls and being attached to the downstream end of the inlet section and the upstream end of the outlet section, respectively, whereby said peripheral and end walls define an annular chamber partly overlapping the blade tips of the rotor; a plurality of guide vanes angularly spaced within said annular chamber, thereby dividing the chamber into a plurality of compartments distributed along the circumference thereof, each guide vane being secured to the walls of the annular chamber and extending from one end wall to the opposite end wall thereof and having a radially innermost edge zone which is oriented into the predetermined direction of rotation of the rotor and includes an angle of between 65°and 40°with an associate radius connecting the inner edge of the vane with the rotor axis.