DETAILED ENGINEERING DESCRIPTION AND MECHANICAL FEATURES OF CONTINENTAL INDUSTRIE MULTISTAGE CENTRIFUGAL
BLOWER MODEL 077A1
I - BLOWER HOUSING
The centrifugal blower housing consists of an inlet head with special feature to direct air to inlet of first impeller and outlet head of special design to eliminate friction and multiple intermediate sections. These parts are made in cast iron EN-GJL-250 (ASTM A48-35B) according to rigid Continental Industrie specifications, extreme care to be exercised in assembly of interlocking cast iron EN-GJL-250 (ASTM A48-35B) intermediate sections and integral annular diffusers (baffles).
The heads are provided with integral mounting legs and rugged tie-rod lugs. The entire assembly is securely held together actually with multiple tension rods which bind the entire housing into a solid integral unit.
1.0Inlet head
1.1Flange connection DN 200, PN 10 (8”)
1.2Cast iron EN-GJL-250 (ASTM A48-35B)
1.3Minimum wall thickness: 9 mm (0.35”)
1.4Can be supplied in various flange positions relative to the vertical centre line in increments of 90° (option)
2.0Outlet head
2.1Flange connection DN 200, PN 10 (8”).
2.2Cast iron EN-GJL-250 (ASTM A48-35B).
2.3Minimum wall thickness: 9 mm (0.35”)
2.4Can be supplied in various flange positions relative to the vertical centre line in increments of 90° (option)
3.0Intermediate section
3.1Cast iron EN-GJL-250 (ASTM A48-35B).
3.2Each intermediate section is cast in one piece
3.3Each section has eight evenly spaced integrally cast ribs for increased strength. Increased surface area allows for proper heat dissipation.
Values, dimensions and reference in this brochure are approximate and intended as guide only, not for construction and are subject to change without notice
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4.0 Bearing housing
The outboard bearing housings are cast iron and bolted to the outside of the head sections insuring cool operation of bearings.
4.1Cast iron EN-GJL-250 (ASTM A48-35B).
4.2Two cored openings are provided to allow circulation of air (except for gas). 4.3 Has cast fins to improve rigidity and increase heat dissipation
4.3Labyrinth type oil seal. Oil passages are generously sized to allow optimum recirculation.
4.4Has air vent and magnetic plug at the bottom of the oil reservoir.
4.5Provided with 3 tapped holes in the housing flange to act as bearing puller.
N.B.: When the inlet air or gas temperature is too high, we can adapt as option special bearing housings with a water or air cooling system (technical drawing on request).
5.0Bearings
5.1The rotor assembly is supported by 2 heavy duty oil lubricated ball bearings, single row, sized to withstand the thrust load also type SKF or FAG.
5.2Sized for minimum 10 years of operation (Direct Drive only), following SKF L10 bearing life calculation method.
5.3Bearings are mounted in outboard type bearing housings and located so that bearings may be serviced without disassembling the blower casing or piping.
6.0Shaft
6.1C35 (AISI 1035) carbon steel shaft, straightened and stressreleved
6.2Shaft is ground all over
6.3Stiff shaft design to minimize vibration
6.4The diameter of the shaft end is 60 mm (2.36”)
7.0Shaft seals
7.1Shaft sealing is accomplished using graphite ring seals or carbon ring seals.
8.0Impellers
8.1The impellers are either fabricated in aluminium shrouds, fixed on a rigid hub in cast aluminium, or cast aluminium in EN AC-43100 (AISI 360.1).
8.2For minimum corrosion all aluminium alloys are non copper alloys
8.3The outer diameter of the impeller is 611 mm (24”)
8.4Each cast impeller is automatically sanded or shotted when leaving the foundry before the machining
8.5Each impeller is statically balanced.
8.6Impeller tip speed: 113 m/sec (372 FPS) at 3600 rpm.
8.7First critical speed (8 stages-cast impellers) 4275 rpm.
8.8Impeller assembly: to consist of a heavy steel shaft accurently machined and one or more aluminium impeller(s), statically balanced, securely keyed to shaft and held in place by lock washers and locknuts.
Values, dimensions and reference in this brochure are approximate and intended as guide only, not for construction and are subject to change without notice
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