Axial fans

Wolter axial fans are produced depending on requirements and the installation, their diameter lying within the rage from 315 up to 1600 mm.  They deliver 1000 up to 200,000 m3 /h of air, under a static pressure of 1500 Pa. Higher pressures are achieved through a row joint with rotors opposed to each other.

Basic Information

Dimensions  and scope of performance

Wolter axial fans are produced depending on requirements and the installation, their diameter lying within the rage from 315 up to 1600 mm.  They deliver 1000 up to 200,000 m3 /h of air, under a static pressure of 1500 Pa. Higher pressures are achieved through a row joint with rotors opposed to each other.

Housing

The Housings of axial fans AXV/BXV are produced of flat steel, hot dip galvanized. Turned-out flanges are placed on both ends of the housing, they have drillings for screws on the circle, according to DIN 24 154, line 2.  Long housings (LH) have terminal boxes to connect  power supply cables. If some motors have to be oiled periodically, their lubrication unit is mounted on the outside of a housing.

A special vision hatch is foreseen to control the rotation direction of the fan. Long housed (LH) fans have their motor and rotor with blades fully open. Short housed (SH) fan motors stand proud from the housing partially.

Rotor

Rotors, hubs and blades are made of die-cast aluminum. The aerodynamic blade profiles provide high efficiency and a possibly low noise level. During rotor downtimes, a smooth change of impinging angle of the blades is possible to be done.  Fans could be produced with different blade numbers which increases the efficiency.

Motor

Wolter uses alternating current motors which meet the IEC 34-1 Norm, EPACT version is possible as an option.  The motors are closed completely, cooled through the housing and all have a fault relay protection.  As a standard, they have IP55 protection level, class F acc. to ISO.  Spark-proof (Ex) motors with a higher protection level  are available by the buyer request, as well as with a different number of poles for the motors with two or three rotation speeds, like two-pole Dahlander motors, or motors with an anchor ring.  Special adjustment versions are possible as well, e.g. for sea ships, food industry or drying chambers. Bearings used are chosen for a foreseen life time according to L10.

Lay out and air flow direction

Axial fans of an AXV/BXV type could be easily mounted in various position.  Layout and possible air directions that are shown on the chart are standard ones and should be specified in the purchase order code.  If the order is placed with no data specified, an S fan version is supplied.

The air flow direction should be given obligatorily in case the fan is required with an engine compartment spray shield.  Arrows on the motor housing show the fan rotation direction and the air flow streamline.

Fan selecion

Should the fan be chosen based on the characteristics, attention has to be paid to the fan curve selection (for a given blades impinging angle), the fan curve should rest over the required operation point, if possible within the middle part of the curve, i.e., when the fan is on its maximal efficiency.

Placing an order

The following important data should be given alongside with an order:

  • a sort of a housing, air flow streamline ant the installation layout
  • a distinct description of a fan which must be given in accordance with the type code
  • air stream delivery in m3/h and static stress of the fan in Pa with the air density at 1,2 kg/m3
  • the required motor power
  • voltage, frequency and number of phases of the electrical connection
  • required accessories

Assembly instructions

The following principles should be observed during the assembly of the fan:

The following principles should be observed during the assembly of the fan:

- Free space and a fair distance, at least 1,5 x fan diameter, from other construction units or framework elements should be guaranteed for the fans either inhausting the air from any room space or delivering the air into that, on the inhaust or outcome side respectively. Moreover, in this case the input nozzle should be equipped with an inlet nozzle (1) reducing turbulent flow behind the fan blades, and the fan with a discharge into the free space should be equipped with a diffuser (4).

- Fans that are built into channel constructions should rest at a corresponding distance (1,5 x Ø) from such construction elements as elbow fittings, T-branches, link and pipe mufflers having inside cores alike, etc.  (2). Flexible joints should be mounted in such a way that they form a smooth surface for the air flow where applicable, standing not in the way of the air duct (3).

If the principles mentioned above are not observed, a turbulent air flow affects the rated output of a rightly chosen fan causing its decline.

 

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