Why are the lubrication pumps usually piston pumps?
High pressure and high flow demand:
Piston pumps have a high pressure rating to meet the needs of high-pressure, high-flow lubrication systems. This property gives piston pumps a significant advantage in lubrication systems where a stable, continuous oil supply is required.
Long life and high efficiency:
The bearing life of the piston pump is long, the total efficiency of the pump can reach 90% and above, and the volumetric efficiency can reach more than 95%. This high performance and long life feature reduces maintenance costs and increases the reliability of equipment operation.
Strong media adaptability:
Piston pumps can be used with a variety of operating media, including mineral oil, emulsions, and other synthetic media. This wide range of media adaptability allows the piston pump to be adapted to different lubrication conditions and requirements.
High adjustment parameters:
The piston pump has a wide range of adjustable working pressure and displacement, which can meet the lubrication needs under different working conditions. For example, working pressures of up to 70 MPa and above, and displacements from a few milliliters per revolution to 1000 ml/r and more, make it possible to precisely control the lubrication system.
Variable Convenience:
Variable displacement piston pumps enable power regulation and infinitely variable speed in hydraulic systems, providing important flexibility for hydraulic drivetrains. In lubrication systems, this feature helps to adjust the lubricant supply in real time according to the operating status of the equipment.
The working principle of the piston pump.
The working principle of the piston pump is mainly based on the reciprocating motion of the plunger in the cylinder to achieve the suction and discharge of liquid. The specific process is as follows:
Oil Suction Process:
When the plunger moves to the right (or when pulled out), the volume of the sealing working chamber in the cylinder block increases and the pressure decreases. At this point, the inlet valve opens and draws the hydraulic oil from the low-pressure area into the working chamber.
Oil pressing process:
When the plunger moves to the left (or pushes inward), the volume of the sealing working chamber decreases and the pressure increases. When the pressure is higher than the outlet pressure, the outlet valve opens to drain the hydraulic oil from the high-pressure area.
Reciprocating motion:
The plunger carries out reciprocating motion under the action of spring or transmission shaft, and continuously repeats the above oil suction and oil pressing process, so as to realize the continuous supply of hydraulic oil.
Variable Adjustment:
Some piston pumps are also equipped with a variable mechanism that regulates the pump’s displacement by changing the inclination of the swash plate. This adjustment allows the piston pump to flexibly adjust the lubricating oil supply according to the actual operating conditions.
