How to choose hydraulic pump

What should we pay attention to when choosing hydraulic pump?

The hydraulic pump is the power component of the hydraulic system, which determines the pressure and flow of the whole system. Therefore, the hydraulic pump should be selected according to the pressure, flow, price, working stability, accuracy and so on required by the system. Should also consider the advantages and disadvantages of various pumps, finally selected.

What is the principle of choosing a hydraulic pump?

① Whether variable is required: radial piston pump, axial piston pump, single acting vane pump is a variable pump.
② Working pressure: piston pump pressure 31.5MPa; The pressure of blade pump is 6.3MPa, which can reach 21MPa after high pressure; Gear pump pressure 2.5MPa, high pressure after up to 25MPa.

③ Working environment: gear pump has the best anti-pollution ability.
④Noise indicators: low noise pumps have internal gear pumps, double-acting vane pumps and screw   pumps, and the instantaneous flow of double-acting vane pumps and screw pumps is uniform.
⑤ Efficiency: the total efficiency of the axial piston pump is the highest; The same structure of the pump, the total efficiency of the pump with large displacement is high.

What are the advantages and disadvantages of various pumps?
① Vane pump:
Compact structure, small size, smooth operation, uniform flow, less pulsation and noise, long life, efficiency is generally higher than gear pump, the price is lower than the plunger pump. Small and medium flow vane pumps are commonly used in throttling regulation systems, and large flow vane pumps are generally only used in non-regulating hydraulic systems in order to avoid excessive power loss.Vane pumps   are used in hydraulic systems of machine tools, hydraulic presses, vehicles, construction machinery and plastic injection machines.

② Gear pump:
Simple structure, low price, reliable operation, easy maintenance, good adaptability to the impact load, small inertia of the rotating part. Bearing load is larger, wear faster, compared with vane pump, plunger pump, the lowest efficiency. Used in machine tools, construction machinery, mining machinery, agricultural machinery.
③ Plunger pump:
Compact structure, long life, low noise, high pressure, large flow, large unit mass power ratio, easy to achieve the adjustment of flow and change of flow direction, but the structure is complex and the price is high. Piston pumps, especially axial piston pumps, are widely used in high-power hydraulic systems   requiring high pressure, large flow and adjustment.

④ Screw pump:
It is essentially a gear pump, which is characterized by simple structure and light weight; Flow and pressure pulsation is small, uniform delivery, no turbulence, no agitation, rarely produce bubbles; Reliable operation, low noise, higher running stability than gear pump and vane pump, high volumetric efficiency, high suction head. But processing is more difficult, can not change the flow. Suitable for machine tools or fine application of two screw or three screw pump, there are two vertical and horizontal installation methods. Close mechanical hydraulic transmission system. Generally used two screw or three screw pump, there are two vertical and horizontal installation methods.