Wilo Norma V Series, Инструкция по установке и эксплуатации

Страница: 47 / 112

ENGLISH
13
6.1.1.2 MOTOR ASSEMBLY TYPE EM :
A cast iron lantern is installed between column upper flange and drive to
allow bigger drives to be installed (up to 18.5KW). This pump
arrangement does not allow axial adjustment of the column. A rigid
coupling keyed onto pump and motor shafts is used for power
transmission. Size “O” smaller than 1300mm.
6.1.1.3 MOTOR ASSEMBLY TYPE TM :
A bearing bracket fitted with two ball bearings is used to support axial
load. This arrangement is available for pumps length above 1920 mm
under mating flange. Ball bearings are grease lubricated. Power is
transmitted through a semi elastic coupling to the pump shaft.
6.1.1.4 MOTOR ASSEMBLY TYPE TH AND MOTOR FRAME
V1 :
A bearing bracket fitted with one over-sized ball bearing is used to
support axial load. This arrangement is available for pumps length above
1920 mm under mating flange. The ball bearing is lifetime lubricated.
Power is transmitted through a rigid coupling to the pump shaft (keyed).
6.1.1.5 MOTOR ASSEMBLY TYP E TH AND MOTOR FRAME
V18:
A bearing bracket fitted with one over-sized ball bearing is used to
support axial load. This arrangement is available for pumps length above
1920 mm under mating flange. The ball bearing is lifetime lubricated.
Power is transmitted through a rigid coupling to the pump shaft
(clamped).
6.1.2 SHAFT BEARINGS :
A bearing is located in pump back cover as close as possible to the
impeller to limit cantilever effects on the shaft.
One or more additional bearings are added along the shaft depending on
the total length of the pump.
Several friction materials are available : Silicon carbide, bronze, PEEK or
Graphalloy®.
Two bearing lubrication principles are used :
Flowded Fluid injection through the bushing
If waste water lubrication is used, fluid pressure will be maintained
between 0.5 and 1bar corresponding to a flowrate of 50l/h.
6.2 FUNCTION
Norma V pumps are usually run at 1450 or 2900 RPM depending on the
requested head.
They are designed with a normalized hydraulic according to EN733 or
ISO2858, a long shaft and depending on chosen variant with a bearing
bracket located above mating flange. This bearing bracket is supporting
pump axial loads.
- Hydraulic back cover must remain wetted in any case. Minimum
level of liquid must ensure that the entire hyraulic is totally
flooded.
- Motor assembly is designed for dry application.
- Some bearings can be added between columns flanges for proper
shaft alignment.