What is the difference between a constant power variable pump and a constant pressure variable pump?

What is the main difference between a constant power variable pump and a constant pressure variable pump? Dalan Hydraulics tells you.
What is the main difference between a constant power variable pump and a constant pressure variable pump? Dalan Hydraulics tells you.

Constant power variable pump:

1. The constant power variable pump is used in the case where the pressure and flow rate are changed, but the power is constant.

2. The constant power variable pump is mainly used in the hydraulic system of engineering machinery. On one electric motor, the power is fully utilized to ensure that the motor does not exceed the power, and the large flow rate at low pressure and the small flow at high pressure are realized.

3. The constant power variable pump follows the constant power when the pressure flow changes, and the constant pressure pump is the maximum displacement quantitative pump before the set value is reached. There is no inflection point to start constant power. After entering the constant pressure working condition, in principle, the flow can be provided according to the needs of the system while maintaining the pressure.

4. Constant power variable pump is a variable in almost all pressure stages, basically ensuring that the output power is constant within a certain range, but within the power range set by the pump, the pressure rises and the flow rate is the full flow output. When this pressure is exceeded, The flow begins to drop to ensure a constant output power.

5. The constant power variable pump can change the moving speed according to the load change, and is also mainly used when the speed change requires the speed change.

Constant pressure variable pump:

1. Constant pressure variable pump is used in the case where the pressure does not change, but the flow changes.

2, constant pressure variable pump can achieve zero flow pressure, generally used in such a hydraulic system: the beginning of the phase requires low pressure fast forward, and then turn to slow speed close, and finally stop and keep pressure.

3. The pressure set by the constant pressure variable pump is the pressure required for the system to maintain pressure.

4. The constant pressure variable pump starts the variable after reaching the set pressure of the pump itself, and the flow rate drops to a steep line.

5. The more important point of the constant pressure variable pump is to save energy even when the pressure is constant.

For a system that has large differences in pressure and flow parameters during repeated cycles or during random operations, people often use the "one key to open a lock" mode for flexible processing.

There are many options for traffic that are large and small:

1 DC phase addition and subtraction (multiple dosing pumps in parallel);

2 full AC (frequency conversion motor driven dosing pump, variable displacement pump);

3 DC plus AC (several dosing pumps, variable displacement pumps, accumulators)

There are also a lot of ways to change the pressure, but in the end it should be considered in combination with the flow changes. Eg: multi-stage pressure switching, electro-hydraulic proportional valve, proportional pressure pump, plus supercharger, plus electric high-pressure pump as booster pump.

There are two options for speed regulation:

1. Pump control motor system:

1 quantitative pump + variable motor;

2 variable pump (inverter motor + metering pump) + quantitative motor.

2. Valve controlled motor system.








----- Editor-in-Chief: Dalan Oil Pump Motor 02-Procurement Consultant

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