In this article, we are going to discuss the basics of pump wheels. You will learn what they are, what they do and how they work..
In this article, we are going to discuss the basics of pump wheels. You will learn what they are, what they do and how they work..
Scroll down to see the YouTube tutorials..
There are many different types of turbines, but most will have these backward curved blades that will be open, semi-open, or closed with covers. These backward curved paddles do not push the water. The curves rotate with the outer edge moving in the direction of the expanding scroll.
These vanes will provide the fluid with a smooth path for the water to flow. We will see this a little later in this article.
The wheel is immersed in water, when the wheel turns, the water inside the wheel also turns. As the water rotates, the liquid is ejected radially in all directions to the edge of the impeller and into the volute. As the water leaves the impeller, a region of low pressure is created which draws more water through the suction inlet. The water enters the eye of the wheel and is trapped there between the blades. As the wheel spins, it transmits kinetic energy, or velocity, to the water. By the time the water reaches the edge of the wheel, it has reached a very high velocity. This high velocity water flows from the impeller into the volute where it strikes the wall of the pump casing. This impact converts velocity into potential energy or pressure. More water follows behind that and so our flow expands. The volute channel has an expanding diameter as it wraps around the circumference of the pump body. As it expands, the velocity of the water decreases, causing the pressure to increase. So this expanding channel allows more water to continue to join and become pressure so the discharge outlet has a higher pressure than the suction inlet. The high pressure of the discharge allows us to force the fluid through the pipes and into a storage tank or around a piping system.
The thickness of the impeller and the speed of rotation affect the volumetric flow rate of the pump, but the diameter of the impeller and the speed of rotation would increase the pressure it can produce..
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