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Working principle of hydraulic oil pump

The constant pressure variable pump is composed of a plunger pump, a variable oil cylinder and a pressure regulating valve.

Before the constant pressure pump reaches the set pressure of the pressure regulating valve on the pump, the swash plate of the variable pump is at the maximum deflection angle, and the pump displacement is maximum and constant. In fact, the constant pressure variable pump is quite a quantitative pump at this stage.

After reaching the set pressure of the pressure regulating valve, the control oil enters the variable oil cylinder, and the variable oil cylinder pushes the swash plate to reduce the pump displacement.

In a constant pressure variable pump system, if there is a relief valve, the set pressure of the pressure regulating valve on the pump should be 0.5-1Mpa lower than the set pressure of the system relief valve. Otherwise, the pump pressure cannot reach the set value of the pressure regulating valve, and it cannot be variable.

Advantages of constant pressure variable piston pump:

1. High parameters: high rated pressure, high speed, and high pump driving power.

2. High efficiency, volumetric efficiency is about 95%, and total efficiency is about 90%.

3. long life.

4. Variables are convenient and come in many forms.

5. Light weight per unit of power.

6. The main parts of the plunger pump are all subject to compressive stress, and the material strength properties can be fully utilized.