Variable vane pump and quantitative vane pump difference

 

1. In the variable vane pump, when the blade in the pressure oil region, at the bottom of the blade pressure oil, when the blade in oil absorption, at the bottom of the blade suction cavity, in this way, the top and bottom of the blade of the fluid pressure is balanced basically, this avoids the quantitative vane pump in oil absorption the problem of severe wear of the stator inner surface. If the blade is still at the bottom of the pressure oil, oil absorption chamber blade tip will give the stator inner surface with larger friction, so that reduces the effect of pressure feedback.

 

2. The blade Angle, but the tilt direction is just the reverse of quantitative vane pump, this is because the variable vane pump vane fluctuation pressure is balanced, blade outward in oil absorption rely mainly on the rotation of the centrifugal inertia effect. According to the mechanics analysis, the tilt direction is more advantageous to leaf protruding from the under the action of the centrifugal inertia.

 

3. Variable vane pump has complex structure, large profile size, relatively moving parts, large leakage, unbalanced radial liquid pressure on the shaft, large noise, volume efficiency and mechanical efficiency are not as high as the quantitative vane pump; However, it can automatically adjust the flow according to the load pressure, the use of power is more reasonable, can reduce oil heating.