What are Pump Impellers?
The most critical part of a pump is the impeller. The impeller is a component that rotates in order to create suction and move the liquid through the pump. The vanes in the impeller dictate the performance properties of the pump.
These impellers require a high level of precision. The water passage is very narrow but with a large overall impeller diameter.
Investment Casting – These impellers are carefully manufactured using investment casting. In investment casting, a wax pattern is created using custom tooling. This wax pattern is coated with refractory material to create a mould. The molten metal is poured into this mould, and the wax melts away and is replaced by the metal, which solidifies to create a very high precision casting.
CNC Machining – These impellers are then machined on CNCs to ensure a high level of accuracy with tight tolerances.
Thread cutting – Threads are cut and checked carefully using specialized go/no-go gauges.
Balancing – The impellers are then dynamically balanced to ensure smooth, vibration-free operation in the pump. In balancing, material is carefully removed over a large area to maintain the integrity and thickness of the impeller shrouds.
Sand Blasting – Finally the parts are sand blasted to give the final part a good clean finish
Where they are used
These impellers are used in high head/pressure pump sets which are assembled by our customer. These types of pumps are often used in the mining industry or other applications where high pressures are required.