Uploaded bySBM Polytechnic
Positive Displacement Pumps : Hydraulics
This document discusses different types of pumps, their construction, working principles, applications, and pressure ranges. It covers positive displacement pumps like gear pumps, vane pumps, screw pumps, and piston pumps. It also discusses non-positive displacement centrifugal pumps. For each type of pump, the document explains key aspects like how displacement is achieved, typical applications, and operating pressure ranges. It concludes by summarizing the topics covered and providing pressure and efficiency data for some common pump types.
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Positive Displacement Pumps : Hydraulics
- 1. - Virag ATimbadia 1
- 2. Introduction Types& Application Explanation Of Each Type Pressure Range 2
- 3. Define Pump State Various Types Of Pump Explain Construction & Working Of Pump Enlist Applications Of Various Types Of Pump State Pressure Range 3
- 4. Pump isa device used To move fluids (liquids or gases) Increases the mechanical energy of the fluid It acts as a Heart Link between reservoir and control valve 4
- 5. Pump Positive displacement Rotary Gear External Internal Gerotor Lobe Vane Fixeddisplacement Unbalanced vane Balanced vane Variable displacement Screw Single (Mono) Twin Reciprocating Axial piston In line Variable plate Inclinable swash plate Cam/crank shaft driven piston pump Bent axis Radial piston Stationary cylinder block Rotating cylinder block Non-Positive displacement / Rotodynamic centrifugal Axial Flow Radial Flow 5
- 6. Pumping volumechanges From maximum to minimum during each cycle Advantages of Hydrostatic Widely used & generate high pressure Small in size & high (power/weight) High volumetric efficiency Flexibility of performance (N = p ≠ Constant) 6
- 7. Fluid displacedusing fluid (motion) inertia Low pressure (rarely used as p < 40kg/cm2) Advantages of Hydro dynamic Initial & maintenance cost is less Simplicity of operation & operated quietly High reliability Capable of handling any type of fluid 7
- 8. Uses themeshing gears to displace fluid Can be classified as External gear pump Internal gear pump Gerotor pump 8
- 9. Two gears Complete sealing Helical gears If pressure angle 14 ½* Then min no of teeth are 16 9
- 10. Various fueloils Chemical additive and polymer metering Chemical mixing and blending (double pump) Industrial and mobile hydraulic applications (log splitters, lifts, etc.) Acids and caustic (stainless steel or composite construction) Low volume transfer or application 10
- 11. Two gears& one Cresent Pressure up to 350bar Less noise Drive Gear Inlet Cam Driven Gear Delivery 11
- 12. All varietiesof fuel oil Resins and Polymers, Alcohols and solvents Polyurethane foam (Isocyanate and polyol) Food products such as chocolate, and peanut butter Paint, inks, and pigments Soaps and surfactants, Glycol 12
- 13. Outer gearidler Outer Gerotor has one tooth more Axis offset Rev = inner teeth/outer teeth Pressure 125bar If not precise leakage Compact compare to ext. pump 13
- 14. More quantityof oil at low pressure 14
- 15. Polymers, Papercoatings Soaps and surfactants Paints and dyes Rubber and adhesives Pharmaceuticals Food applications 15
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- 17. Aerosol andPropellants, Refrigeration Coolants Aviation Service - Fuel Transfer, Deicing Auto Industry - Fuels, Lubes Bulk Transfer of LPG and NH3, Aqueous solutions LPG Cylinder Filling, Alcohols, Solvents Refrigeration - Freons, Ammonia 17
- 18. Elastomer Stator UniversalCoupling Single Screw Rotor 18
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- 20. Piston usedare 6, 8 or 10 If plate is straight At = 0*, No flow At = 180*, Forward Flow At = -180*, Reverse Flow Max Swash plate angle limited to17 ½* Pressure 700 bar 20
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- 23. Sr. No. PumpPressure (bar) Efficiency (%) 1 External gear pump 300 60 2 Internal gear pump 350 85 3 Fixed vane pump 175 75 4 Variable vane pump 125 85 5 Screw pump 175 75 6 Axial piston pump 700 85 7 Bent axis pump 700 90 23
- 24. Following thingsstudied during session Pump and its function Classification Construction of various types of pump Working of various types of pump Application of various types of pump Pressure Range & Efficiency 24
- 25.