Product Description; Design; Monitoring Devices - Wilo Rexa PRO Serie Instrucciones De Instalación Y Funcionamiento

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Product description

4.1

Design

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Fig. 1: Overview
4.1.1 Hydraulics
4.1.2 Motor
4.1.3 Seal
4.1.4 Material
4.2

Monitoring devices

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Product description
Submersible sewage pump as submersible monobloc unit for continuous duty in wet well
and dry well installation.
1 Motor
1
2 Power supply cable
3 Seal housing
2
4 Discharge port
5 Suction port
6 Hydraulics housing
3
7 Handle/attachment point
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Centrifugal hydraulics with different impeller shapes and horizontal flange connection on
the pressure side. Depending on the hydraulics, the following impeller shapes are used:
▪ E = single-channel impeller
▪ W = vortex impeller
The hydraulics are not self-priming, therefore the fluid must flow in either under natural
pressure or under supply pressure.
Single or three phase AC surface-cooled motors are used as a drive. The motor is cooled by
the fluid around it. The waste heat is transferred directly to the fluid or the ambient air via
the motor housing. The motor can emerge during operation. Continuous duty is also possi-
ble in dry well installation depending on the motor power. The connection cable is longitu-
dinally watertight and has bare cable ends.
The seal for the fluid and the motor compartment is made via two mechanical seals. The
sealing chamber between the mechanical seals is filled with medicinal white oil.
▪ Pump housing: EN-GJL-250 (ASTM A48 Class 35/40B)
▪ Impeller: EN-GJL-250 (ASTM A48 Class 35/40B) or EN-GJS-500-7 (ASTM A536 70-50-05)
▪ Motor housing: EN-GJL-250 (ASTM A48 Class 35/40B)
▪ Shaft: Stainless steel AISI 1.4021 (420)
▪ Seal, on the motor side: C/MgSiO
▪ Seal, on the fluid side: SiC/SiC
▪ Seal, static: NBR (Nitrile)
Overview of monitoring devices:
Internal monitoring devices
Motor compartment
Motor winding: Temperature limiter
(1-circuit temperature monitoring)
Motor winding: Temperature controller
(2-circuit temperature monitoring)
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P 17
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WILO SE 2019-02