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VPMR CLOSED BLADES

V04NRM

22
WENTYLATORS HIGH PRESSURE
TO ACCESS THE LIST PRICE YOU MUST  REGISTER
Flow rate: 360 - 33840 [m3 / h] | Pressure: 135 - 1965 [mmH2O]
The NRM series is particularly suitable for the pneumatic conveyance, gases, granulated materials. Situable for the transport of solid materials mixed with air, sawdust and woodchips if the fan is not crossed.
The NRM series has medium and low capacities, high pressures. Statically and dynamically balanced steel impeller. Fluid temperatures up to 60°C in standard execution; special executions for higher temperatures.

■ ATEX non-sparking version: shims on non-rotating parts potentially in contact with the fan in non-ferrous material.
■ Anticorrosive execution of paint choirs or special materials.
■ High temperatures with cooling fan up to 300 ° C, special executions on request for temperatures up to 450 ° C.




 

Arrangement 5

Direct coupling. Impeller mounted directly on the motor shaft. Flanged motor and fan without chair. Maximum operating temperature in standard execution: 60 ° C. In special execution: 150 ° 
 

Arrangement 4

Direct coupling. Impeller mounted directly on the electric motor shaft supported by the chair. Maximum operating temperature in standard execution: 60 ° C. In special execution: 150 ° C.

Arrangement 9

Belt coupling, cantilever impeller. Supports and motor mounted on a chair outside the air circuit. Maximum operating temperature in standard execution: 60 ° C. With cooling fan: 300 ° C.

Arrangement 12

Belt coupling, cantilever impeller. Supports mounted on chair, fan and motor mounted on the same base.Maximum operating temperature in standard execution: 60 ° C. With cooling fan: 300 ° C.
1) Case
2) Impeller
3) Suction Nozzle
4) Electric Motor B3 or B5
5) Motor supporting base
6) Outlet counter flange
7) Suction counter flange
8) Fan Support
9) Ring for felt sealing
10) Felt
11) Rubber gasket
12) Motor holding disk
13) Fan to dissipate heat
14) Grid for fan protection  
15) Single-block support
16) V-belts
17) Pulley
18) Transmission guard
19) Tipper
20) Base
21) Motor slides
The standard production of fans with size 400 ÷ 630 provides an orientation with an angle of 30 ° instead of 45 °.
Requests with different angles must be made when ordering.
AVAILABLE ON REQUEST
Vibration - Damping Coupings

 
Fitted on fan support stand to prevent vibration being transmitted to support structure.

 
Inlet Counter-Flanges
 
It’s used to connect the system pipes to the fan.
 
Outlet Counter-Flanges
 
It’s used to connect the system pipes to the fan.
 
Motor Protection Casing
 
Casing designed to protect the motor against atmospheric agents.
 
Inlet Trunk
 
Are designed to facilitate duct-mounting or wall-mounting of fans.
Vibration - Damping Coupings Flexible Connection Inlet Side


 
The vibration-damping couplings are used to avoid the transmission of noise and vibrations to canalization systems.


 
Vibration - Damping Coupings Flexible Connection Outlet Side

 
The vibration-damping couplings are used to avoid the transmission of noise and vibrations to canalization systems.
 
Inlet Protection Grilles

 
Are used to prevent the entry of foreign objects into the fan.
 
Outlet Protection Grilles

 
Are used to prevent the entry of foreign objects into the fan.
 
Guillotine Damper

 
Are used to reduce the fluid flow at the fan outlet.
REQUEST INFORMATION
DEFECTS
CAUSES
POSSIBLE REMEDIES





Insufficient air delivery

1) Clogged piping and/ or obstructed
suction points.
2) Insufficient rotational speed.
3) Working pressure higher than design.
4) Clogged wheel.
5) Reversed rotation direction.
6) Overloaded filter.
7) Suction vorticity in the same rotation direction as the wheel.
8) Changes in section, sharp and close. Sudden expansions or curves not allowing the normal reset of the inlet dynamic pressure.
1) Clean pipings and hoods; check the position of locks.
2) Check the power voltage and the connection of motor terminals; check the gear ratio and that belts do not slip.
3) Design error. Replace motor and pulleys; replace and/or adapt the circuit.
4) Clean the wheel through the special door when the machine is stopped.
5) Check the connection of windings on motor terminal board.
6) Increase the operating frequency of the automatic cleaning device (where foreseen) or operate manually.
7) Fit an anti-turbulence device (straightening blades).
8) Check the layout of the air circuit.
 


Difficult starting.

9) Excessive power absorption.
10) Reduced power voltage.
11) Insufficient motor pickup torque.
12) Fuses not suitable for actual needs.
13) Inadequate evaluation of the fan inertia and of the fining components.
9) Like above.
10) Check the motor plate data.
11) Replace with a more powerful motor or, for radial fans, close the locks until reaching full speed.
12) Replace them.
13) Recalculate the moments of inertia and, if necessary, equip the fan with a new motor drive.

Insufficient pressure

14) Too much low rotational speed.
15)  Capacity higher than design values because of an error in the circuit dimen-sioning or of air temperature significantly different from the 15°C reference value.
16) Reversed rotation direction.
17) Wheel partially blocked and/or damaged.
14) Like above.
15) Change the gear ratio and/or replace the fan, redimension the circuit,
16) Like above.
17) Check the wheel assembly position, conditions.
Excessive air capacity.

(If rotational speed is correct, high ab-sorption for radial fans with curved blades
forwards)..
18) Rotational speed.
19) Air leaks through access doors, pipings, wrong-manufactured or wrong-installed components, or by-pass locks not closed properly.
20) Excessive evaluation of circuit power losses.
18) Check the rotation direction; the particular conditions of suction turbulence; rotational speed in the a.c. motor; power voltage and winding faults.
19) Check the system and replace the non complying components.
20) Close the locks or slow the speed down the desired performance.
 

Vibrations

21) Inadequate support structure (natural frequency close to the one corresponding to the fan rotational speed).
21) Alter the support adding some weight.


Absorbed power higher

than plate data.
22) High rotational speed so to require a higher power than the installed one.
23) Air density higher than design data.
24) Capacity higher than design levels for a pressure lower than design value.
22) Replace motor and pulleys and/or redefine the system.
23) Like above.
24) Like above.




Excessive noise

25) High number of revolutions to get the
required performance.
26) Failure in bearings.
27) Wheel unbalance and its sliding on the box.
28) Eccentricity between rotor and stator.
29) Vibrations in the winding.
30) Squilibri delle parti rotanti.
25) Use soundproof boxes and/or silencers; choose a bigger machine
with the same performances or a machine with lower rim speed.
26) Check the wear of bearings (in particular the proof ones) and lubrication.
27) Check the assembly positions of wheel and pipings.
28) Check the concentricity.
29) Can be reduced with higher quality motors.
30) Recheck the balance.



Air pulsations

31) Centrifugal fans operating under
conditions of zero capacity.
32) Instability of the suction flow with
presence of vortex.
33) Detachment of the fluid vein from the back of the blade or the walls of a pipe.
31) Redefine the inlet by the introduction of flaps.
32) Redefine the system and/or replace the fan.
33) Like above
 
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