What factors affect the starting torque of a screw pump?

torque of a screw pump

1. Pump resistance torque

 

1) Pump speed

The resistance torque of the pump is proportional to the speed of the pump

 

2) Pump specifications

The greater the rated flow rate of the pump, the greater the rotational torque of the pump.

The greater the rated outlet pressure of the pump, the greater the rotational torque of the pump.

 

3) Internal structure of the pump

The higher the machining accuracy of the pump, the smaller the resistance torque of the pump. The viscosity of the oil in the pump body is smaller with jacketed heating than without jacketed heating, so the frictional resistance between the oil and the pump body cavity is smaller, so the resistance torque of the pump is also smaller.

 

2. Pump operating conditions

 

Hydraulic torque For positive displacement screw pumps, the characteristics of hydraulic torque and speed are constant torque. In addition, the hydraulic torque of the pump is related to the operating conditions of the pump.

1) The longer the inlet and outlet pipelines of the pump (including equivalent length), the greater the friction loss and the greater the hydraulic power consumed, so the greater the hydraulic torque.

2) The smaller the diameter of the inlet and outlet pipes of the pump, the greater the friction loss at the same flow rate, and therefore the greater the hydraulic torque.

3) The higher the liquid level in the tank connected to the pump outlet line, the greater the torque required to overcome the static head. The higher the liquid level in the tank connected to the pump inlet line, the less torque the pump requires.

4) The actual flow rate of the pump is proportional to the number of revolutions of the pump and decreases as the viscosity of the oil increases. The greater the actual flow rate of the pump, the greater the hydraulic power consumed, and the greater its hydraulic torque.

5) The pressure difference between the inlet and outlet of the pump is related to the static pressure of the storage tank on the discharge side of the pump and the resistance of the pipeline system. The greater the pressure difference between the inlet and outlet of the pump, the greater the hydraulic power consumed and the greater the hydraulic torque.

 

3. The viscosity of the oil also affects the torque of the screw pump

 

1) The higher the temperature of the oil, the smaller the viscosity of the oil, and the smaller the required torque.

2) When the temperature is constant, the larger the heavy oil grade, the greater the viscosity and the greater the required torque.

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