Water pump
a mechanical device using suction or pressure to raise or move liquids, compress gases, or force air into inflatable objects such as tyres. |
| water pump |
Working of water pump
All pumps use basic forces of nature to move a liquid. As the moving pump part (impeller, vane, piston diaphragm,etc.) begins to move, air is pushed out of the way. The movement of air creates a partial vacuum (low pressure) which can be filled up by more air, or in the case of water pumps, water. This is similar to sucking on a straw. A partial vacuum is created in your mouth when you suck on the straw. The liquid is pushed up the straw because of the pressure differences between your mouth and the atmosphere.constraction
The suction pipe is connected to the sump or a ground level tank from where the fluid has to be pumped. The suction pipe at the sump is connected with strainer thus restricting any foreign particles entering into the pump. Generally as the length of the suction pipe is less the friction loss also will be less. The other end of the suction pipe is connected to the suction eye of the pump. The suction eye is the first point of entry of water into pump. The discharge pipe is connected to the above level where the fluid has to be delivered. Since the length of the discharge pipe is long the friction loss will also be higher at the discharge end.The casing of the pump is designed of gradually increasing cross sectional area. It means that velocity of the fluid is decreased in order to attain pressure energy. So the casing does the work of reducing the velocity of the fluid.
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