Industrial Centrifugal Fans

Venti Oelde industrial fans areused to handle air, gas andvapours, with or without solids.They are durable, quiet andeasy to maintain. They are inuse in a wide variety of formsin almost all key industries.

Industrial centrifugal fans, recognizably Venti

Venti Oelde designs and con-structs each centrifugal fan onthe basis of the specific pro- c ess parameters. The seriesHRV, DHRV, ZHRV and HVencompass volume flows fromsmaller than 5,000 to above3,000,000 m³/h. The totalpressure differences rangefrom 1,500 to 65,000 Pa. A fan with optimum efficiencycan, therefore, be found forany required operating point.

The operating data determinewhether we build our centrifu-gal fans as single inlet, dou-ble inlet or multi-stage fans.Operating temperaturesextend to 500 °C and higher.Impellers are overhung ormounted between bearings.The centrifugal fans are withdirect drive, through couplingor with v-belt drive.

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HV

ZHRV

60,000

40,000

20,000

10,000

10,000 100,000 1,000,000 2,000,000 3,000,000

HRV/DHRV

Volume flow V̇ [m³/h]

23

Venti Oeldeʼs services start atthe first contact and continuethrough to the provision of sup-port during regular operation.From project work to assembly,including along the way theplanning phase and engineer-ing, a personal contact willalways be available.

Even after delivery andassembly, Venti Oelde explicit-ly remains a partner for all cus-tomers. Venti Oelde specialistsare there personally for all rele- vant work – during assemblyand commissioning as well formaintenance and servicing. Inaddition customers can call us24/7 on our service hotlineunder +49 (0) 171-195 57 50.

Arrangements

Double inlet centrifugal fan

Shown with raised concrete foundation

Arrangement M

Direct drive –impeller on motor shaft,

shown with baseframe

Arrangement K

Drive through coupling, shown with baseframe

45

Single inlet centrifugal fan

Shown with raised concrete foundation

Arrangement RG

V-belt drive, shown with baseframe

Arrangement R

V-belt drive

Arrangement ZHRVM

Two-stage centrifugal fan,shown with baseframe

270°

180°

90°

360°

315°

225° 135°

45

°

255°

285° 75°

105°

30°15

°345°330°

300°

240°

210°

165°

150°

120°

60°

195°

Casing

Inlet box

clockwise

Overhung impeller and appropriate inlet configuration

Depending on the operatingdata, our centrifugal fans aredesigned to be either single ordouble inlet, i.e. single-width ordouble-width. On the basis ofthe geometry, masses, speedand the expected load on therotor, we determine, togetherwith the customer, whether theimpeller is to be overhung or

mounted between bearings.With double inlet centrifugalfans, the medium handledenters via inlet boxes that areflange-mounted to the fan inletside or are directly welded tothe volute casing.

Versatile in design and set-up

Single inlet and double inlet impeller

AA

A A

90°

180°

270°

360°

45°

135° 225°

315°

105°

75° 285°

255°

330°34

5°15°30°

60°

120°

150°

195°

210°

240°

300°

165°

Possible discharge and inlet box positions clockwise

Possible outlet and inlet box positions anti-clockwise

Casing

Inlet box

anti-clockwiseOutlet spigot

Outlet spigot

View A from the drive side towards casing

View A from the drive side towards casing

Mounting industrial fans on aconcrete foundation ensureshigh torsional stiffness andnegates the need for a weldedmotor pedestal. Recessedfoundations or raised concretefoundations are suitable.Anchoring the fan directly tothe raised concrete foundationis preferable to the steel con-struction particularly if, as aresult of the operational condi-tions, rotor unbalance is to beexpected. If required, we canalmost completely eliminatedynamic interaction betweenfan and base by fitting vibra-tion dampers between them.

The inlet side of a fan withoverhung rotor is configuredwith a flange-mounted duct ora shaped inlet, possibly includ-ing an interposed damper.

Air flows to rotors mountedbetween bearings throughinlet boxes. The dampers arearranged as multi-bladed lou-ver dampers in front of theinlet boxes or inlet vane con-trols downstream of the inletboxes.

Impeller mounted between bearings and appropriate inlet configuration

Impeller mounted between bearings and appropriate inlet configuration

Mounting on raised concrete foundation using a baseframe

Direct mounting on raised concrete foundation without baseframe

Direct mounting on vibration-reducing concrete foundation without baseframe

67

Logarithmically backward inclined blades

Backward curved blades

Impeller geometry and blade shape for every application

Aerofoil blades

Forward inclined blades

Straight, radial-tipped blades

89

Designs and special solutions which count

Shaft with journal bearingseat and pre-mountedshaft seal, coupling withaxial backlash limitation

Bearing housing of a self-aligning roller bearing with

cooling impeller and pre-mounted shaft seal

Disc brake

Drum brake

We also use external oil sup-ply systems for the lubricationof bearings and drives; ifrequired, in compliance withAPI Standard 614.

Rotor turning gear units areused to slowly rotate the fanwhen maintenance work isdue or to permit the fan toslowly and uniformly cooldown when the main drivehas been switched off. Thechosen rotating speed is nor-mally very low, but sufficientto maintain lubrication of thefan bearings.

We fit our fans with bearingssupplied by reputable manu-facturers. When hot gases are being handled, coolingimpellers between the casingand bearing ensure the re-moval of residual and creepingheat. In critical cases, oil-cir -culating lubrication providesadditional bearing cooling.

1011

Drum and disc brakes serve toshorten the run-down timewhen the fan has beenswitched off and to retain thefan when it is at a standstill.

Venti Oelde also designs theshaft seals individually accord-ing to the specific plant operat-ing conditions; if required,multi-chamber labyrinth sealswith sealing gas connectionare used. Sealing the shaftpassage through the casingprevents dust or toxic gasesescaping or ambient air con-taminating the medium han-dled.

Venti Oelde combats wearcaused by friction and impactto impellers and inside casingwalls with a variety of mea s-ures. Effective protective pro-cedures are decided duringthe fan planning phase withthe goal of prolonging servicelife by using suitable materi-als, high-precision machiningand optimum blade geometry.

Designs and special solutions which count

1213

Stiffening cone Impeller

Impeller backplate

Impeller hub

ShaftConnection shaft to hub = conical

Fan casing

Insulating collar

Novapress seal

Cooling disc

Bearings

Disc seal

Clamp bracket

Spacer rings made from aluminium or steel

Seal discs made from flexiblegraphite composite rings

Value-added accessories

If specified, we can almostcompletely eliminate dynamicinteraction between fan andbase by fitting vibrationdampers between them.Vibration dampers, togetherwith flexible joints, ensuredecoupling between the fanand connected systems.

Finally, Venti Oeldeʼs electron-ic monitoring systems reliablyprovide cost-effective preven-tive maintenance and service.Vibration monitors control theoscillation amplitude and giveearly warning of any dreadedmaterial caking in the fan. Ourdynamic balancing systemsreduce any imbalance andvibrations by mass balancing.

Variable speed motors, louverdampers or inlet vane controlsserve to adapt the gas volumeflow to the needs of the con-nected system.

1415

Side wall of noise reduction enclosureSupply air through silencer,simultaneously used to cool the motor

Silencer integrated in the booth

Vibration damper

Baseframe

Shaped inlet with guard

Venti Oelde offers made-to-measure noise protection: All major components of ourfans are acoustically opti-mized by our own technicaldesigns. Individual noisecontrol measures simultane-ously provide insulationagainst heat loss. VentiOelde thus offers particularlybudget-friendly solutions.

Additional measures can betaken, such as the insulationand decoupling of structure-borne noise from foundationsand connections. Carriers ofemissions to the outside, likefresh air intake ducting andstacks can be insulated, forexample, by means ofsilencers. Of course, fansand drive units can also becompletely enclosed.

Flexible joints decouple thefans from the ducting system.A suitable fabric for the flexi-ble joints is selected to fulfildemands made by the me-dium handled. The chosenfabric is usually neoprene, sili-cone-glass or PVC-polyester.Steel flexible joints haveproved particularly successfulwith difficult media.

Inlet measuring nozzle

Upright splitter silencer with blank

Inlet flexible joint

My request for quote from Venti Oelde

Company

Street

Post Code/Town/Country

Contact

Phone/Email

General informationSite

Altitude above sea level m Air pressure Pa

Ambient temperature max. °C min. °C

Service voltage V Frequency Hz

Design dataApplication

Volume flow Am³/h

Operating temperature °C max. temperature °C

Pressure difference � static � total

Pa Pa inlet

Medium handled

Density kg/Nm³/h

Dust content mg/Am³ Type of dust

Noise specifications Sound pressure level Lp (A) dB (A) at a distance of 1m or

Sound power level Lw (A) dB (A)

Other

Arrangement � Single inlet � Double inlet� Steel pedestal � Baseframe� Bearing pedestals on � Bearing pedestals and motor

raised concrete base soleplate on raised concrete base

Other

Scope of supply � Control element � Flexible joints� Vibration dampers � Vibration monitoring� Motor� Silencer � Noise insulation

Other

Additional information

By fax, smartphone or PC

Please complete the questionnaire, tear out along the perforation and send it to us at:

00 49 (0)25 22-75 523.

We shall answer promptly.

Scan the QR Code* with your smartphone or tablet and you will be directed to our online questionnaire.

*QR Code scanner app is required.

The questionnaire is also available to complete online at:

www.venti-oelde.com/ICF_Questionnaire

Ventilatorenfabrik Oelde GmbHP.O. Box 37 09D-59286 OeldePhone: +49 25 22 75 - 0Fax: +49 25 22 75 - 2 50info@venti-oelde.dewww.venti-oelde.de

Exhaust air treatment plants

Dust collection and process air cleaning plants

Ventilating, heating and air conditioning plants

Industrial fans

Surface technology

Recycling and waste processing plants

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