Monitoring Devices - Wilo FK 17.1 Instrucciones De Instalación Y Funcionamiento

4.1.2 Motor
4.1.3 Cooling system
4.1.4 Seal
4.1.5 Material
4.2

Monitoring devices

Installation and operating instructions Wilo Motor FK 17.1, FK 202, FK 34, FK 42 + EMU FA, Rexa SUPRA, Rexa SOLID
Product description
▪ Four-channel impeller
▪ SOLID impeller, closed or half open
Inspection cover (depending on the hydraulics)
Additional opening on the hydraulics housing. This opening is used to remove clogging
in the hydraulics.
Casing and impeller wear rings (depending on the hydraulics)
The suction port and impeller are subjected to the most stress when pumping. In the
case of channel impellers, the gap between the impeller and the suction port is an im-
portant factor for a constant efficiency. The larger the gap between the impeller and
the suction port, the higher the losses in the delivery rate. The efficiency decreases and
the danger of clogging increases. In order to ensure long and efficient operation of the
hydraulics, an impeller wear ring and/or casing wear ring is installed depending on the
impeller and the hydraulics.
▪ Impeller wear ring
The impeller wear ring is attached to the channel impellers and protects the incoming
flow edge of the impeller.
▪ Casing wear ring
The casing wear ring is installed in the suction port of the hydraulics and protects the
incoming flow edge in the centrifugal chamber.
The two components can be replaced easily when worn.
In the three-phase current version, self-cooling submersible motors are used as the
drive. The motor can be used in continuous duty both immersed and non-immersed.
Continuous duty is also possible in dry well installation. The roller bearings are perman-
ently lubricated, which means they are maintenance-free. The connection cable has
bare cable ends.
The motor has an active cooling system. For the cooling, the motor is filled with medi-
cinal white oil. The coolant is circulated by an impeller. The impeller is driven by the
motor shaft. The waste heat is transferred directly to the fluid via the cooling flange.
The cooling system itself is not pressurised.
The seal for the fluid and the motor compartment is made via two mechanical seals. The
two mechanical seals are arranged in two different ways:
▪ Version "G": two separate mechanical seals
▪ Version "K": two mechanical seals in a block seal cartridge made of stainless steel
The sealing chamber between the mechanical seals is filled with medicinal white oil and
accommodates any possible leakage of the mechanical seal on the fluid side.
The following materials are used in the standard version:
▪ Pump housing: EN-GJL-250 (ASTM A48 Class 35/40B)
▪ Impeller: EN-GJL-250 (ASTM A48 Class 35/40B)
▪ Motor housing: EN-GJL-250 (ASTM A48 Class 35/40B)
▪ Seal:
– On motor side: SiC/SiC
– Fluid side: SiC/SiC
– Static: NBR (nitrile)
The precise details of the materials are shown in the respective configuration.
Overview of possible monitoring devices:
Internal monitoring devices
Motor compartment
Motor winding
Motor bearings
Sealing chamber
External monitoring units
Sealing chamber
FK 17.1 FK 202 FK 34
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− − o
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en
FK 42
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o
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