90L100KP Danfoss duplex piston pump working principle

Danfoss duplex piston pump Working principle: Danfoss duplex piston pump will be two cylindrical plugs of the same shape into two pump cavities of the same shape, and in the pump cavity through different positions on the plunger torque, and the pump outlet with a certain pressure and can provide greater power, this is the working principle of the pump when the plunger can not run according to the design pressure (according to the actual situation) can be stopped according to the following reasons: pump does not oil: plunger seal aging and blockage caused by the return or damage; low pressure; insufficient oil; foreign objects in the pump; poor lubrication; seal damage or serious oil leakage; pump casing, gear wear serious.

Stop the pump into the tank; wait for the pressure to rise and then start pump work; then the pressure drop increases; the pressure inside the pump remains unchanged, when the pressure drops to a certain level when the vacuum pump suddenly starts the pump pressure suddenly rises or drops; when the engine stops the discharge plunger pump pressure continues to drop until it can not continue to drop; the plunger suddenly stops moving or even can not move; can not continue pumping; sudden stop; pressure rises to normal values After the pressure returns to normal; engine start difficulty or suddenly stop the pump; because the pump cavity is full of gas or oil, and can not be discharged (when the engine is running at no load) may cause serious damage to the bearings and mechanical parts damage.

In the course of work, when the cylinder clearance is too large, it is easy to cause hydraulic cylinder circuit blockage, hydraulic cylinder resistance increases, the hydraulic cylinder stroke becomes shorter, the hydraulic system working pressure is reduced when the hydraulic cylinder clearance is too large, resulting in hydraulic cylinder piston rod bending, wear, axial movement and oil leakage, so that the hydraulic cylinder is contaminated and leakage, resulting in cylinder clearance is too large or more than the required sealing gap.

If the hydraulic cylinder clearance is too large, can not reach the specified sealing requirements, should remove the gasket replacement; If the hydraulic cylinder clearance is too large, the cylinder pressure drop increases, so that the cylinder body force becomes larger, causing the piston rod bending, axial movement and oil leakage, so that the hydraulic cylinder is contaminated and leakage, resulting in leakage of the hydraulic system; If the hydraulic cylinder clearance is too large, but the piston rod can still be maintained in the specified position or will not move outward, it means that there is a blockage of the cylinder bore or spring. If the pressure is not enough, it can suddenly cut off the power and stop working in the process; if the clearance of high pressure hydraulic cylinder is too large, it will not cause the oil pressure to drop and pressure to rise and cause the cylinder to be crushed or strained; if the pressure drop is large and stable, it can indicate that the high pressure cylinder is seriously damaged.