Industrial Centrifugal Fans

Industrial centrifugal fans, recognizably Venti Total pressure difference ⌬pt [Pa] at a density of 1.205 kg/m³ Venti Oelde industrial fans are used to handle air, gas and vapours, with or without solids. They are durable, quiet and easy to maintain. They are in use in a wide variety of forms in almost all key industries. Venti Oelde designs and constructs each centrifugal fan on the basis of the specific process parameters. The series HRV, DHRV, ZHRV and HV encompass volume flows from smaller than 5,000 to above 3,000,000 m³/h. The total pressure differences range from 1,500 to 65,000 Pa. A fan...

Venti Oelde's services start at the first contact and continue through to the provision of support during regular operation. From project work to assembly, including along the way the planning phase and engineering, a personal contact will always be available. Even after delivery and assembly, Venti Oelde explicitly remains a partner for all customers. Venti Oelde specialists are there personally for all relevant work - during assembly and commissioning as well for maintenance and servicing. In addition customers can call us 24/7 on our service hotline under +49 (0) 171-195 57 50.

Direct drive – impeller on motor shaft, shown with baseframe Drive through coupling, shown with baseframe Double inlet centrifugal fan Shown with raised concrete foundation

V-belt drive V-belt drive, shown with baseframe Arrangement ZHRVM Two-stage centrifugal fan, shown with baseframe Single inlet centrifugal fan Shown with raised concrete foundation

Versatile in design and set-up mounted between bearings. With double inlet centrifugal fans, the medium handled enters via inlet boxes that are flange-mounted to the fan inlet side or are directly welded to the volute casing. Single inlet and double inlet impeller Overhung impeller and appropriate inlet configuration Possible outlet and inlet box positions anti-clockwise View A from the drive side towards casing Depending on the operating data, our centrifugal fans are designed to be either single or double inlet, i.e. single-width or double-width. On the basis of the geometry, masses, speed...

Impeller mounted between bearings and appropriate inlet configuration The inlet side of a fan with overhung rotor is configured with a flange-mounted duct or a shaped inlet, possibly including an interposed damper. Air flows to rotors mounted between bearings through inlet boxes. The dampers are arranged as multi-bladed louver dampers in front of the inlet boxes or inlet vane controls downstream of the inlet boxes. Impeller mounted between bearings and appropriate inlet configuration Direct mounting on raised concrete foundation without baseframe Mounting on raised concrete foundation using a...

Impeller geometry and blade shape for every application Backward curved blades Logarithmically backward inclined blades

Straight, radial-tipped blades Forward inclined blades Aerofoil blades

Designs and special solutions which count Shaft with journal bearing seat and pre-mounted shaft seal, coupling with axial backlash limitation Bearing housing of a selfaligning roller bearing with cooling impeller and premounted shaft seal

We fit our fans with bearings supplied by reputable manufacturers. When hot gases are being handled, cooling impellers between the casing and bearing ensure the removal of residual and creeping heat. In critical cases, oil-circulating lubrication provides additional bearing cooling. Rotor turning gear units are used to slowly rotate the fan when maintenance work is due or to permit the fan to slowly and uniformly cool down when the main drive has been switched off. The chosen rotating speed is normally very low, but sufficient to maintain lubrication of the fan bearings. We also use external...

Venti Oelde also designs the shaft seals individually according to the specific plant operating conditions; if required, multi-chamber labyrinth seals with sealing gas connection are used. Sealing the shaft passage through the casing prevents dust or toxic gases escaping or ambient air contaminating the medium handled. Venti Oelde combats wear caused by friction and impact to impellers and inside casing walls with a variety of measures. Effective protective procedures are decided during the fan planning phase with the goal of prolonging service life by using suitable materials, high-precision...

Disc seal Fan casing Stiffening cone Impeller Impeller backplate Insulating collar Impeller hub Novapress seal Cooling disc Shaft Connection shaft to hub = conical Clamp bracket Seal discs made from flexible graphite composite rings Spacer rings made from aluminium or steel

Value-added accessories If specified, we can almost completely eliminate dynamic interaction between fan and base by fitting vibration dampers between them. Vibration dampers, together with flexible joints, ensure decoupling between the fan and connected systems. Finally, Venti Oelde’s electronic monitoring systems reliably provide cost-effective preventive maintenance and service. Vibration monitors control the oscillation amplitude and give early warning of any dreaded material caking in the fan. Our dynamic balancing systems reduce any imbalance and vibrations by mass balancing. Variable speed...

Inlet measuring nozzle Upright splitter silencer with blank Inlet flexible joint Flexible joints decouple the fans from the ducting system. A suitable fabric for the flexible joints is selected to fulfil demands made by the medium handled. The chosen fabric is usually neoprene, silicone-glass or PVC-polyester. Steel flexible joints have proved particularly successful with difficult media. Venti Oelde offers made-tomeasure noise protection: All major components of our fans are acoustically optimized by our own technical designs. Individual noise control measures simultaneously provide insulation...

Company Street Post Code/Town/Country Contact Phone/Email General information Site Altitude above sea level Ambient temperature Service voltage Design data Application Volume flow Operating temperature Pressure difference Medium handled Density Dust content Noise specifications Other Arrangement Other Scope of supply Other max°C min°C □ static □ total kg/Nm3/h mg/Am3 Type of dust Sound pressure levelLp (A) dB (A) at a distance of 1m or Sound power levelLw (A) dB (A) □ Single inlet □ Steel pedestal □ Bearing pedestals on raised concrete base □ Double inlet □ Baseframe □ Bearing pedestals...