Installation and operating instructions Wilo-RexaBloc RE/Rexa BLOC 37
PRODUCT DESCRIPTION English
3.
Product description
The hydraulics is manufactured with great care and is subject
to constant quality controls. Trouble-free operation is guar-
anteed if the device is installed and maintained correctly.
3.1.
Intended use and fields of application
DANGER
due to explosive fluids!
It is strictly prohibited to pump explosive
fluids (petrol, kerosene etc.). The hydraulics is
not designed for these fluids!
The Wilo-RexaBloc RE… sewage hydraulics is suitable for
pumping:
• Wastewater
• Sewage containing faeces
•
Sludges with up to 8 % dry matter (depending on type)
The sewage hydraulics must
not
be used for pumping:
• Drinking water
• Fluids containing hard components such as stones,
wood, metals, sand etc.
•
Highly flammable and explosive fluids in pure form
Intended use also includes compliance with this manual. Any
other use is regarded as non-intended use.
3.2.
Structure
The Wilo-RexaBloc RE are sewage hydraulics with a flanged
IEC standard motor in monobloc design for stationary dry well
installation.
Fig. 1.: Description
1 Hydraulics
6
Sealing chamber
monitoring (optionally
available)
2 Bearing bracket
7 Venting screw
3 IEC standard motor
8 Drainage screw
4 Suction connection
9 Support
5 Discharge connection
A “Bare shaft” design (hydraulics without motor)
B
Unit (hydraulics with flanged motor)
3.2.1. Version
As standard, a unit consisting of hydraulics with a flanged
motor is delivered.
Alternatively, a “bare shaft” design can be delivered. In this
case, the operator has to provide a suitable motor and install
it on site.
3.2.2. Hydraulics
Hydraulics housing and bearing bracket as a self-contained
unit, with channel impeller or vortex impeller, axial suction
port and radial discharge port. The connections are config
-
ured as flange connections.
Bearing bracket with seal on the fluid and motor sides, as well
as sealing chamber and leakage chamber for receiving fluid
ingress through the seal. The sealing chamber is filled with
environmentally harmless medicinal white oil.
The hydraulics are not self-priming, in other words, the
fluid must flow in either automatically or with supply
pressure.
3.2.3. Monitoring devices
As an option, the sealing chamber can be monitored by an
external pencil electrode. This signals if there is water ingress
into the sealing chamber through the mechanical seal on the
fluid side.
3.2.4. Seal
Sealing on the fluid side is achieved by a bidirectional
mechanical seal. Sealing on the motor side is achieved by a
rotary shaft seal.
3.2.5. Materials
•
Hydraulics housing: EN-GJL-250
•
Impeller: EN-GJL-250 / EN-GJS-500
•
Bearing bracket: EN-GJL-250
•
Housing cover: EN-GJL-250
•
Shaft: 1.4021
•
Static gaskets: NBR
• Seal
•
On the fluid side: SiC/SiC
•
On the motor side: NBR or carbon/aluminium oxide
•
Motor housing: EN-GJL-250
3.2.6. Drive
The hydraulics is driven by IEC standard motors in “B5”
construction. For more information about the motor and the
monitoring devices present, see the installation and operat-
ing instructions for the motor manufacturer.
3.3.
Operation in an explosive atmosphere
The hydraulics must
not
be operated in an explosive atmos-
phere!
3.4.
Operation with frequency converters
NOTICE
Also note all the information in the operating
and maintenance manual for the motor!
Operation on a frequency converter is possible. The following
parameters must be observed:
• The maximum speed must
not exceed
1450 rpm.
•
Continuous duty with a volume flow of Q
opt
< 0.7 m/s
should be avoided.
• The circumferential speed must
not fall below
a mini-
mum of 13 m/s.
NOTICE
The circumferential speed can be calculated as
follows:
v = n · d · π / 60,000
Key:
-n = speed in rpm
-d = impeller diameter in mm
-v = circumferential speed in m/s
3.5.
Operating modes
See the rating plate or installation and operating instructions
for the motor to see the possible operating modes.
3.5.1.
Operating mode S1 (continuous duty)
The motor can operate continuously at the rated load with-
out exceeding the permissible temperature.
