Tuesday, March 16, 2010

Main parameters considered in SINOBALER

Main parameters considered in SINOBALER

The pressure of hydraulic pump

Working pressure p: Exit pressure when pump is working, it is depend on load.

Rated pressure ps : Under normal running condition, according to test standard, the highest pressure during continuous running.

Absorption Pressure: Entrance Pressure.

Pump delivery capacity, flow rate and volumetric efficiency

Delivery capacity V: In theory, the volume of fluid the pump delivered one circle. The unit is . It is depend on the dimension of the pump.

Average theory delivery capacity q t : In theory, the fluid volume delivered by pump in unit time.qt= n v , unit is m3/s or L/min.

Actual delivery capacity q : the actual fluid volume delivered by pump in unit time. In the exit of the pump, when pressure≠ 0, there is leakage, so q = q t–Δq.

Instantaneous theory delivery capacity qsh: each split second, the volume delivered by pump. Usually, the instantaneous theory delivery capacity is pulsant, means qsh≠q t。

Rated delivery capacity qs : Under rated pressure and rated rotate speed, the volume of the pump delivered.

Volumetric efficiencyηv:ηv= q /q t =(q t –Δq)/ q t = 1–Δq /qt=1-kp /nV K is leakage coefficient.

Pump power and efficiency
Input power P t: P t= Tω
Output power P: P = p q
Total efficiencyηp : ηp = P / P t= p q / Tω=ηvηm
ηm is torque efficiency.

Pump rotate speed

Rated rotate speed n s: Under rated pressure, the highest speed allowed in run-on time.

The highest rotate speed n max: Under rated pressure, the highest speed allowed in short time.

The lowest rotate speed n min: Normal running, the lowest speed allowed.

Rotate speed range: The speed between lowest speed and highest speed.


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