Page 160 - Fluid Power Engineering

134 Cha pte r F o u r

13 Vane pump
(single stroke per revolution,
pressure un-balanced)
Volume is created between
the rotor, stator (cam ring),
and vanes.
V = 10–150 cc
g
n = 1000–3500 rpm
p = 100 bar
max
z V
V = ( − V )
g max min

4.10 Pump Specification
The following list shows the basic specifications that should be avail-
able to specify the pump precisely:

• Size (displacement)
• Speed (maximum and minimum speeds)
• Maximum operating pressure (continuous/intermittent)
• For open/closed circuit
• Direction of rotation (viewed to shaft end; clockwise [R],
counterclockwise [L])
• Controller (for variable displacement pumps)
• Seals (oil)
• Drive shafts
• Port connections
• Mounting type
• External dimensions
• Installation position
• Operating temperature range
• Further details in clear text

4.11 Exercises

1. Explain briefly the principal of operation of displacement pumps.
2. Give the expressions describing ideal and real pumps.
3
3. A displacement pump of 23 cm geometric volume operated at 1450 rev/min
delivers the oil at 20 MPa pressure. Assuming an ideal pump, calculate the pump