Select the basic factors of hydraulic pump
Hydraulic pump is the hydraulic system to provide a certain flow and pressure of the power components, is the indispensable core components of each hydraulic system, reasonable selection of hydraulic pump to reduce the energy consumption of the hydraulic system, improve the efficiency of the system, reduce noise, improve performance and ensure the reliable work of the system are very important.
The selection of hydraulic pump comprehensive consideration of the basic factors include:
(1) Safety pressure and maximum working pressure of the system.
(2) Allowable speed of hydraulic pump.
(3) Calibration characteristics of hydraulic pump.
(4) The required flow of hydraulic system.
(5) The relationship between pressure, speed and flow rate.
(6) Adaptability of variable control.
(7) pressure shock tolerance.
(8) Leakage loss degree.
(9) Volume efficiency and total efficiency.
(10) Pollution tolerance.
(11) Operation reliability and durability.
(12) Life expectancy under various loads and rotating speeds.
(13) The relationship between oil characteristics and wear rate of hydraulic pump.
(14) Oil absorption conditions.
(15) Maintainability.
(16) Compatibility, cost and economic factors of the whole system.
The principle of choosing hydraulic pump is: according to the working condition of the host, the power size and the requirements of the system on the working performance, first determine the type of hydraulic pump, and then determine the pressure and flow size required by the system. Choose hydraulic pump not only to consider the pressure, flow, volume, cost, other aspects are also very important. For example, the compatibility of the system where the hydraulic pump is located, the reliability of the pump and its life expectancy.
For the use of low pressure, medium and high pressure, in terms of its economy, the external gear pump is cheaper than other pumps, but with the increase of pressure and the extension of the use of time, its noise value will increase sharply. Such as Weigers vane pump pressure pulsation and noise is smaller, in the case of fixed medium pressure use, than the external gear pump is more suitable, its total efficiency is lower than Weigers plunger pump. Experience shows that the use of screw pump pressure in 2-3 MPa is very economical, the pump is the most quiet and no pulsation, when the oil clearance is appropriate, its reliability coefficient is very high. Radial variable piston pump has a long life expectancy and can be used in high pressure situations. When the working pressure of axial piston pump is 20-25 MPa, its life expectancy is 40000h, when the working pressure is 30-35mpa, its life will be reduced to 15000h.
The above factors in the selection of the pump should be considered one by one, so that it has the corresponding adaptability, the hydraulic pump in the system to operate reliably, otherwise there will be a variety of failures.
