AXICO ANTI-STALL® Axial flow fan Fläkt

FPAC and FPMC axial-flow fans Page 4DesignThe fan is supplied as a complete unit consisting of acasing with stabilizing ring, guide vane assembly,impeller, blade pitch control mechanism, guard, motor toIEC standard, and motor stand. Anti-vibration mountingsof high damping rubber type and a flexible duct of PVCcoatednylon fabric for connection to an outlet duct aresupplied.In arrangement 6, the fan is also supplied with a flexibleduct on the suction side.The unique stabilizing ring controls and stabilizes theturbulense occurring in a heavily throttled fan. An axialfan without this stabilizing ring would be forced to surge,which may eventually lead to material fatigue and operationdisturbances.The fan is available in two versions:FPACFPMCThe blad eangle is controlled by a diaphragmmotor located in the hub of the impeller.The diaphragm motor is pneumatically actuatedby means of a positioner.The FPAC offers accurate control of the bladeangle, combined with fast response.The positioner operates with a pneumatic inputsignal or with an electric input signal as anoption.The blade angle is controlled by an electromechanicactuator operating on a control lever.The actuator is an accessory which, when orderedsimultaneously with the fan, is fitted to the outsideof the casing.Arrangements availableArrangement 1Arrangement 3Arrangement 6HorizontalThe fan impeller is mounteddirectly on the motor shaft.This is a compact arrangementwhich is particularly suitable forair handling units.The impeller is belt-driven forhigh total pressure capacity.For particulars of speeds, seethe motor table on page 20.The motor is slidably mountedon a base frame, which makesthe belt tension easy to adjust.The belt drive is provided witha galvanized steel guard.The impeller is mounted directlyon the motor shaft.This arrangement is intended forconnection to ducting on bothsides. The FPAZ-21 inlet is usedfor open-suction installation.The fan can also be installedvertically.Materials and finishThe main components of the impeller (hub, blades, etc.)are made of cast aluminium alloy. The control disc ismade of cast iron. Other components of the fan, such ascasing, stand, fasteners, shafts, etc., are mainly made ofsteel.The fan is painted with an 80-micron thick coat of bluealkyd paint. The fasteners are galvanized.Environmental class C1, ISO 9223Fans to higher environmental class up to and includingC4 are available to special order.InstallationThe fan is to be mounted on the supplied anti-vibrationmountings which are secured to the floor. Instructionsare submitted with the fan.PackagingThe fan is delivered on a pallet, and is protected withplastic sheeting.Vertical, with upwarddirection of air flowArrangement 7Vertical, with downwarddirection of air flowThe impeller is mounted on anintermediate shaft connected tothe motor by means of a highlyelastic flexible coupling. Theintermediate shaft is journalledin two bearing blocks. Greasenipples for periodic lubrication ofthe bearings are provided on theoutside of the fan and are easilyaccessible. The motor can easilybe replaced without the impellerand control components beingdisturbed.