ISO 13349:2010 pdf free download – Fans一Vocabulary and definitions of categories.
5.4 Drive arrangements
The six most commonly used types of drive are the following.
a) Direct drive from the shaft of the motor or other prime mover: the impeller is fixed to the shaft extension.
b) Drive through an in-line direct coupling: the drive shaft and the impeller shaft are each fixed on a part of the in-line direct coupling and rotate at the same speed.
c) Drive through an in-line slipping coupling: the drive shaft is fixed to the primary part of the coupling and the impeller shaft to the secondary part of the coupling, enabling them to rotate at different speeds, the relative difference of which (i.e. the slip) depends upon the speed, the torque to be transmitted and, when appropriate, the degree of control applied to the coupling.
d) Drive through a gearbox: the drive shaft and the impeller shaft are not necessarily coaxial; they may be parallel or at an angle, their speeds being in one or more given ratio(s).
e) Belt drive: the drive shaft and the impeller shaft are not in-line, but parallel, the drive between the two being by means of flat, toothed or vee belts (or belts of some other section) and suitable pulleys. Their speeds are in a given ratio subject to a small amount of slip, except in the case of the toothed belt.
f) Direct drive with inset motor: the motor is set inside the fan casing or impeller such as an external rotor motor.
Fans shall be classified according to the drive arrangements of the fan, especially as far as direct and belt driven units are concerned. These are shown in Table 4 for centrifugal units and Table 5 for axial units.
5.7.5 Position of component parts of an axial-flow, mixed-flow or other fan with coaxial inlet and outlet
The angular position of a motor, an inlet box or bend, outlet bend, inspection door, terminal box, mounting feet, extended lubricators and axis of the belt drive or gearbox input shaft, is defined by the angle, in degrees, between the origin and the axis of the component measured in a clockwise direction, when viewed along the axis of rotation, from the side opposite to the inlet, irrespective of the direction of rotation of the fan (see Figure 23).
An exception is a reversible axial-flow fan which is viewed from the driving side. Where the definition of origin given in Figure 23 does not apply, an arbitrary origin may be chosen.
5.7.6 Position of motor or other prime mover
5.7.6.1 Plan view position of motor for belt or chain drive
The position of a motor when viewed perpendicular to the fan mounting base shall be denoted by the letters W, X, Y, Z, as shown in Figure 24, and it shall be specified whether the drive is on the inlet side or on the side opposite the inlet.
5.7.6.2 Position of motor in a direct-driven axial-flow, mixed-flow or other fan with coaxial inlet and outlet
The motor position for a direct-driven fan with horizontal or vertical axis shall be designated as shown in Figure 25.
5.8 Characteristic dimensions and component parts
5.8.1 Characteristic dimensions
Size designations and inlet and outlet flanges shall be as defined in ISO 13351. The definitions of size designation are given in 3.8.4.
Figures 26 to 29 show the arrangements of typical fans. In each case, the fan inlet is identified by “1”, whilst the outlet is identified by “2” and the impeller tip diameter by “3.”
5.8.2 Terms for fan component parts
The illustrations in Figures 26, 27, 28 and 29 have been chosen as examples to show component parts of fans (Table 7 gives the index of fan parts and Table 8 lists the preferred terms for fan component parts). Many alternative features and arrangements are possible and the selected illustrations shall not be taken as standard designs for the kinds of fan involved.