Technical Description for Axial fans AND with adjustable blades Rosenberg fans.
Axial fans with adjustable blades cover a wide capacity range due to their large variation possibilities with hub relation, number of blades and blade angle.
With the Rosenberg AND series, pressure increases up to 1200Pa and volumes up to 120,000cmh can be realised.
The allowed temperatures of the conveyed mediums are from -200C up to +800C as a standard, following description of motor manufacturer. Special motors for higher temperatures are available upon request.
The standard air flow direction is pressured over the motor. To reverse airflow direction, blade position must be rotated 1800 and the direction of motor rotation must be changed.
The fans are suitable for vertical and horizontal installation The fans are designed for installation in a ventilation system and therefore supplied without protection guard as a standard.
Casings of Axial fans AND with adjustable blades Rosenberg fans.
As a standard, after the casing is fully manufactured from mild steel. It will be hot dipped galvanised as an anticorrosive measure for longer life span. Every casing comes with defined flange master gauge for holes to ensure an easy connection to the duct system. The centrally mounted motor is wired via a flexible cable conduit to an externally located IP55 protected terminal box on the fan casing.
The fan casing have a thickness of 2.5 to 3mm for fans diameter up to 1000mm and a minimum of 4mm for larger fans size.
In the long casing version, the casing, the motor and the blades are covered. In the short casing version, the motor protrudes out. Two stage axial fans, coupling of two long casing fans, are also available upon request.
Impellers of Axial fans AND with adjustable blades Rosenberg fans.
The axial impellers are balanced on quality level G 6.3 according to DIN ISO 1940. The hubs of chilled casting aluminum are made in two parts and have removal drilling for easy dismounting of the impellers. The profile blades are made of aluminum die cast. In standstill the blades angles are adjustable. If the blade angle α is adjusted after delivery, the power requirement must be checked for overload of the motor. The impeller has to be balanced after blade adjustment. The blade angle is measured on the wing
tip. The number of blades is variable which expands the performance range and allows any operation. Aluminum alloy LM6M blades are use in smoke and fume extract applications for up to 4000C.
Rosenberg supplies glass reinforced polypropylene blades for fan diameter 630 and below for normal class F motor as a standard. The blades are injection molded UV stabilized anti-static, black color and with the same curve profile as the aluminum blades. Temperature range from -100C to +800C.
The chemical resistance of polyproylene make the fans suitable to use in area exposed to some diluted acids and alkali, oily and with various organics such as alcohols, ketones, aromatic and chlorinated environment.
Motors of Axial fans AND with adjustable blades Rosenberg fans.
3-phase IEC standard motors of type B3 with protection class IP55, insulation class F in 2-, 4-, 6- or 8 pole execution are used. Pole changeable, voltage controllable, invertor motors and single phase A.C. motors or higher airflow temperatures are available upon request. Motor used comply with electrical standard to IEC 60034 standard. Standard efficiency, IE1 motors are used. Higher efficiency motors like IE2 or IE3 are also available upon request.
The contact addresses are to be found in the attachment, or else please phone +49 (0)7940 / 142- 209
(-210) or email toinfo@rosenberg.com.vn