By drawing a neat diagram explain the construction and working of an air pump.
By drawing a neat diagram explain the construction and working of an air pump.
Air Pumps
1. Air pumps are commonly used for filling the air in bicycle tubes, balloons, and football bladders.
2. These pumps can also be used for removing air from a vessel, thereby creating a partial vacuum.
Construction
1. It consists of a metal or a plastic barrel, on one side of which is provided a piston attached to a handle.
2. The piston consists of two leather caps joined back to back and held in position by a nut and bolt arrangement.
3. On the other side, the barrel is provided an arrangement with two nozzles A and Bm which are connected to cylindrical metal valves P and Q respectively.
4. The metallic valves open in one direction only.
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Working
1. To start with, imagine the metallic valves are in a closed position.
2. Furthermore the piston is close to the nozzles and an uninflated balloon is attached to nozzle B.
3. When the piston is pulled outward (Figure), it sweeps the air out from the barrel.
4. This results in the fall of pressure within the barrel. To nake for this fall in pressure, the air from outside exerts pressure through nozzle A and forces open the valve P.
5. The air enters inside the barrel. The valve Q, however, remains closed.
6. When the piston is pushed inward, the pressure of the air inside the barrel increases. This increased pressure closes valve P but opens valve Q.
7. Thus, the air from the barrel flows out through nozzle B and collects in the balloon. The air once gone inside the balloon cannot flow, because valve P closes.
8. Thus, by putting and pushing the handle, more and more air enters the balloon and hence it gets inflated.
9. If we attach nozzle A to some vessel from which air is to be removed, then by pushing and pulling the handle, the air from the vessel is slowly taken out.
10. In such a mode, it acts as an exhaust pump.
Air Pumps
1. Air pumps are commonly used for filling the air in bicycle tubes, balloons, and football bladders.
2. These pumps can also be used for removing air from a vessel, thereby creating a partial vacuum.
Construction
1. It consists of a metal or a plastic barrel, on one side of which is provided a piston attached to a handle.
2. The piston consists of two leather caps joined back to back and held in position by a nut and bolt arrangement.
3. On the other side, the barrel is provided an arrangement with two nozzles A and Bm which are connected to cylindrical metal valves P and Q respectively.
4. The metallic valves open in one direction only.
'
Working
1. To start with, imagine the metallic valves are in a closed position.
2. Furthermore the piston is close to the nozzles and an uninflated balloon is attached to nozzle B.
3. When the piston is pulled outward (Figure), it sweeps the air out from the barrel.
4. This results in the fall of pressure within the barrel. To nake for this fall in pressure, the air from outside exerts pressure through nozzle A and forces open the valve P.
5. The air enters inside the barrel. The valve Q, however, remains closed.
6. When the piston is pushed inward, the pressure of the air inside the barrel increases. This increased pressure closes valve P but opens valve Q.
7. Thus, the air from the barrel flows out through nozzle B and collects in the balloon. The air once gone inside the balloon cannot flow, because valve P closes.
8. Thus, by putting and pushing the handle, more and more air enters the balloon and hence it gets inflated.
9. If we attach nozzle A to some vessel from which air is to be removed, then by pushing and pulling the handle, the air from the vessel is slowly taken out.
10. In such a mode, it acts as an exhaust pump.
