What is the function of the the triangle groove on the valve plate of double acting vane pump? ()
A. The liquid pressure at the bottom and top of the blade is balanced with each other
B. When the sealing volume from the oil absorption area enters into the pressure oil area, the sudden change of pressure is avoided and the flow pulsation is reduced
C. The rotor and blade can rotate freely to keep a certain clearance between them and the port plate
D. When the blade moves radially in the rotor slot, the velocity does not change suddenly, and the impact of vane pump is reduced
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Which pump can't be used as a bidirectional variable displacement pump ().
A. double acting vane pump
B. single acting vane pump
C. axial piston pump
D. radial piston pump
Which force causes vanes to come out of the rotor slots?( )
A. centripetal force
B. centrifugal force
C. friction force
D. none of the above
Which of the following statements is true? ( )
A. combination of stator with rotor is known as cartridge unit (泵芯)
B. combination of stator with vanes is known as cartridge unit(泵芯)
C. combination of rotor with vanes is known as cartridge unit(泵芯)
D. none of the above
The displacement of hydraulic pump or motor depends on ().
A. fow rate change;
B. pressure change;
C. speed change;
D. structure size.
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