vane pump ppt

vane pump

1. Vane pump presentation Pusa institute of technology Rivesh Raj 1508131091 Mechanical –b Morning shift

2. Vane pump A rotary vane pump is a positive-displacement pump that consists of vanes mounted to a rotor that rotates inside of a cavity V a nes are allowed to slide into and out of the rotor and seal on all edges, creating vane chambers that do the pumping work. On the intake side of the pump, the vane chambers are increasing in volume. These increasing-volume vane chambers are filled with fluid forced in by the inlet pressure. Inlet pressure is actually the pressure from the system being pumped, often just the atmosphere. On the discharge side of the pump, the vane chambers are decreasing in volume, forcing fluid out of the pump. The action of the vane drives out the same volume of fluid with each rotation.

3. Construction parts

4. Vane Rotor Cam ring Casing

5. Positive-displacement principle A positive-displacement pump is one that displaces (delivers) the same amount of liquid for each rotating cycle of the pumping element. Constant delivery during each cycle is possible because of the close-tolerance fit between the pumping element and the pump case. When a hydraulic pump operates, it performs two functions. First, its mechanical action creates a vacuum at the pump inlet which allows atmospheric pressure to force liquid from the reservoir into the inlet line to the pump. Second, its mechanical action delivers this liquid to the pump outlet and forces it into the hydraulic system. The rotor is sealed into the cam by two sideplates. Vanes or blades fit within the slots of the impeller. As the rotor rotates (yellow arrow) and fluid enters the pump, centrifugal force, hydraulic pressure, and/or pushrods push the vanes to the walls of the housing. The tight seal among the vanes, rotor, cam, and sideplate is the key to the good suction The housing and cam force fluid into the pumping chamber through holes in the cam 3. As the rotor continues around, the vanes sweep the fluid to the opposite side of the crescent where it is squeezed through discharge holes of the cam as the vane approaches the point of the crescent . Fluid then exits the discharge port.

6. Types of pump Single vane pump. Double vane pump

7. Triple vane pump

8. Advantages Handles thin liquids at relatively higher pressures Compensates for wear through vane extension Sometimes preferred for solvents, LPG Can run dry for short periods Can have one seal or stuffing box Develops good vacuum Disadvantages Can have two stuffing boxes Complex housing and many parts Not suitable for high pressures Not suitable for high viscosity Not good with abrasives

9. Applications  Aerosol and Propellants Aviation Service - Fuel Transfer, Deicing Auto Industry - Fuels, Lubes, Refrigeration Coolants Bulk Transfer of LPG and NH3 LPG Cylinder Filling Alcohols Refrigeration - Freons, Ammonia Solvents Aqueous solutions