Classification and constructional performance of radial fans
I. Depending on the magnitude of the total pressure distinguish fans:
- Low pressure - creating the total pressure to 1000 Pa
- medium-pressure - created a total pressure from 1000 to 3000 Pa
- high pressure - creates total pressure from 3000 to 12000 Pa
II.. Depending on the value of the circumferential speed of the impeller fans are divided into classes:
- to the first class includes fans with forward curved at u & lt; 30 u=" 50=" li=" & gt ;
- The second class includes fans with forward curved blades at u & gt; 30 m/s and fans with backward curved blades at u & gt; 50 m/s
III. Depending on the rotational direction of the fans made right or left rotation. right rotation fan wheel, rotating clockwise, anticlockwise rotation direction - with a wheel rotating counterclockwise when viewed from the side of the suction fan openings
Fans of #2.5 to #12.5, inclusive, are made with a rotating body, allowing them to be installed in any of the positions and numbers above 12.5 are made to swivel body commissioned by the consumer. The position of the helical fan housing determine the angle of rotation relative to the initial zero position. housing rotation angles are counted in the direction of rotation of the impeller in accordance with the drawing.
IV. Depending on the location of the drive distinguishes 7 of designs of fans:
- 1 st, impeller planted directly on the motor shaft
- 2nd shaft with an impeller fastened in the bearing and is connected to coupling with electric motor
- 3rd shaft with an impeller fastened in two bearings and is connected to coupling with electric motor
- 4 -e impeller shaft fastened in the bearing and is connected with electric motor belt drive
- 5th, with the impeller shaft fastened in two bearings and is connected with electric motor belt drive
- 6th, double suction fan, which impeller shaft fastened in two bearings and is connected to coupling with electric mot or
- 7th, double suction fan, which impeller shaft fastened in two bearings and is connected with electric motor belt drive.