Basic mechanical engineeering - Pumps


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Basic mechanical engineeering - Pumps

  1. 1. M.S.STEVE Assistant Professor Dept. of Mechanical Engineering Amal Jyothi College of Engineering, Kanjirapally. Email: ( Phone: +91 9745917858
  2. 2. A pump is a machine which converts mechanical energy to fluid energy, the fluid being incompressible. This action is opposite to that in hydraulic turbines. Based upon the working principle pumpa can be classified as Amal Jyothi College of Engineering, Kanjirapally
  3. 3. Centrifugal pump Amal Jyothi College of Engineering, Kanjirapally
  4. 4. Centrifugal Pump
  5. 5. Amal Jyothi College of Engineering, Kanjirapally
  6. 6. Working Of Centrifugal Pump • Basically consist of three main stages 1. Priming- filling the suction pipe and the entire casing with water to develop required suction head 2. Developing required suction head by the centrifugal force produced by impeller 3. Producing required discharge head  By increasing kinetic energy of water with impeller  Converting kinetic energy to pressure energy with the help of involute casing Amal Jyothi College of Engineering, Kanjirapally
  7. 7. Centrifugal Pump…..a short look  Initial process to be done is priming of pump.  The presence of foot valve(non return valve) helps to retain the water in pump when it is stopped  In pumps, the movement of blade system(impeller) moves the fluid, which is always in contact with blade thereby converting mechanical energy of blade system to kinetic energy  So the centrifugal head imparted to the fluid by its rotation enables the liquid to reach at higher level  The increase in cross sectional area of casing towards the delivery pipe helps to convert the kinetic energy of water to required pressure energy  For perfect conversion, the moving blade should be in contact with the fluid at all places. In other words, the moving blade system should be completely immersed in fluid. Amal Jyothi College of Engineering, Kanjirapally
  8. 8. Positive Displacement pump  In positive displacement pumps, fluid is pushed whenever pump runs. The principle of action is the actual displacement or pushing of liquid by piston plunger etc.  These pumps are also called as ‘static pumps’. The pumps, operated under this principle, are reciprocating, screw, ram, plunger, gear etc.  The volume of liquid delivered is constant regardless of the pressure and is varied only with the variation in the speed of the running motor Amal Jyothi College of Engineering, Kanjirapally
  9. 9. Positive Displacement pumps Lobe pump Reciprocating pump Rotary Gear pump Amal Jyothi College of Engineering, Kanjirapally
  10. 10. Reciprocating Pump • Components  Suction and delivery pipe with unidirectional valves,  Cylinder piston arrangement,  Connecting rod and crank mechanism • Working  Suction stroke-backward movement of piston creates vacuum inside cylinder causing the water to come in  Discharge stroke- forward movement of piston pushes the water to discharge pipe Amal Jyothi College of Engineering, Kanjirapally
  11. 11. Reciprocating Pumps