2.Type:
(1).4-68 type centrifugal fan is made into single suction.There is No.2.8、3.15、3.55、4、4.5、5、6.3、8、10、12.5、16、20 total twelve machine No.s.
(2).type centrifugal fan can be made into right rotating fan and left rotating fan two types.Viewing from the side of motor, the fan whose impeller rotates clockwise is called right rotating fan, indicating it with right;the fan whose vane rotates counter-clockwise is called left rotating fan, indicating it with left.
(3)The position of fan outlet is indicated with air outlet angle of case.Both right rotating fan and left rotating fan can be made into 0o, 45o, 90o, 135o, 180o, 225o total six angles.
(4)The driving way of fan hasA, B, C, D four kinds;No.2.8~5 adopt A type driving ;No.5.3~12.5 adopt C and D type driving;No.16, 20 adopt Btype driving.
(The type of driving A:Directly driving by motor;B:Cantilever supporting pulley being in the middle of the bearing;C:Cantilever supporting pulley being on the out side of bearing:D :drive type with coupling)
2.Type:
(1).4-68 type centrifugal fan is made into single suction.There is No.2.8、3.15、3.55、4、4.5、5、6.3、8、10、12.5、16、20 total twelve machine No.s.
(2).type centrifugal fan can be made into right rotating fan and left rotating fan two types.Viewing from the side of motor, the fan whose impeller rotates clockwise is called right rotating fan, indicating it with right;the fan whose vane rotates counter-clockwise is called left rotating fan, indicating it with left.
(3)The position of fan outlet is indicated with air outlet angle of case.Both right rotating fan and left rotating fan can be made into 0o, 45o, 90o, 135o, 180o, 225o total six angles.
(4)The driving way of fan hasA, B, C, D four kinds;No.2.8~5 adopt A type driving ;No.5.3~12.5 adopt C and D type driving;No.16, 20 adopt Btype driving.
(The type of driving A:Directly driving by motor;B:Cantilever supporting pulley being in the middle of the bearing;C:Cantilever supporting pulley being on the out side of bearing:D :drive type with coupling)
3.Structure
In 4-68 type fans, No.2.8~5 consist of impeller, case, air inlet etc parts and directly connecting motor.No.6.3~20, beside the above parts, has driving part, etc.
(1).impeller consists of12 backward airfoil blades, and they are welded between the arc cone type wheel cap and plate wheel pan.it is made of steel plate;through calibration of dynamic and static balance, it possesses the advantages of good air performance, high efficiency and stable operation.
(2).The case is made of ordinary steel plate and welded into spiral casing shape.
