How to select a hydraulic pump?

How to select a Hydraulic Pump?

The hydraulic pump is the power source of the hydraulic system, we should choose the pump that can adapt to the pressure generation circuit required by the actuator, and at the same time, we should fully consider other factors to ensure that the chosen pump can operate stably for a long time.
1. Whether to require variable
According to different structures, hydraulic pumps can be classified as vane pumps, gear pumps, piston pumps and screw pumps (not commonly used). According to whether the flow rate changes, can be divided into quantitative pump and variable pump.
Constant speed, choose a quantitative pump, there are gear pumps and double-acting vane pump; if the requirement of the pump flow variable, can choose single-acting vane pump and piston pump.
2. System pressure
When choosing a hydraulic pump, should consider making the pump has a certain pressure reserve, the rated working pressure of the hydraulic pump should be 10%-20% higher than the system working pressure.
Generally speaking, in low pressure (high pressure less than 7Mpa) working conditions, what type of pump can be used. High pressure (high pressure less than 60Mpa) working conditions should choose piston pumps, gear pumps are used more in the medium pressure (high pressure less than 32Mpa) working conditions. Vane pump, screw pump in the low pressure application is more economical.
3. Working environment
The resistance to pollution sources, of which the gear pump is good, followed by the vane pump. Plunger pumps require high cleanliness of oil.
4. Noise index
Under the same working conditions, the noise generated by the hydraulic pump varies with the type of pump. External gear pump and piston pump noise, while the screw pump is small, vane pump and internal gear pump noise between the two. Hydraulic pumps produce noise with the pressure, displacement and rise, but also with the rise in speed and rise.
5. Efficiency
The efficiency of the hydraulic pump is generally affected by the following factors: size, geometric clearance and the accuracy of the fit of the parts inside the hydraulic pump; viscosity and performance of the fluid; operating pressure and speed. In order to obtain a higher volumetric efficiency, when choosing a hydraulic pump, it is important to understand the allowable limit between the internal parts of the hydraulic pump.
Generally speaking, the total efficiency of axial piston pump is high, followed by vane pump, and then gear pump. The same structure of the pump, the total efficiency of the pump with large displacement is high; the same displacement of the pump in the rated working conditions of the total efficiency is high.
6. Application occasions
Vane pumps are generally used only in non-regulating hydraulic systems, such as machine tools, hydraulic presses, vehicles, construction machinery and plastic injection machines in the hydraulic system. Gear pumps are mostly used in machine tools, construction machinery, mining machinery, agricultural machinery. Piston pumps, especially axial piston pumps, are widely used in high-power hydraulic systems that require high pressure, high flow and need regulation, such as forging machinery, transportation machinery, mining machinery, metallurgical machinery, ships, aircraft, etc.
When choosing a hydraulic pump, in addition to the above factors, the designer of the hydraulic system and the use of maintenance personnel should also take into account other factors, such as safety pressure, the highest working pressure of the system, the compatibility of the entire system and other basic factors. At the same time, the manufacturer's reputation, maintenance and the availability of accessories, etc., is also the issue to be considered when choosing a hydraulic pump.

For more details, pls contact with Deeleap company by www.dyhydr.com.