High pressure plunger pump use pressure should be in general between 10MPa ~
100MPa. It belongs to the positive displacement pump, with the help of the
volume of the working chamber periodic change to achieve the purpose of liquid
transport; The mechanical energy of the prime mover is directly converted into
the pressure energy of conveying liquid by the pump; The capacity of the pump
only depends on the changing value of the working chamber volume and the
changing times in unit time, and theoretically has nothing to do with the
discharge pressure.
Reciprocating pump with the help of the reciprocating movement of the piston
in the cylinder chamber (or through the diaphragm, bellows and other flexible
elements in the chamber of periodic elastic deformation) to make the chamber
volume of periodic change. Structurally, the reciprocating pump chamber is
separated from the outside by means of a sealing device, through the pump valve
(suction valve and discharge valve) and pipeline communication or closure. High
pressure plunger pump is a reciprocating pump, belongs to the volume pump, its
plunger driven by the eccentric rotation of the pump shaft, reciprocating
motion, its suction and discharge valves are one-way valves. When the plunger is
pulled out, the pressure in the work room decreases and the outlet valve closes.
When the pressure is lower than the inlet valve, the inlet valve opens and the
liquid enters. When the plunger is pushed inward, the pressure of the workroom
rises and the inlet valve closes. When the pressure is higher than the outlet
pressure, the outlet valve opens and the liquid is discharged.
When the shaft drives the cylinder to rotate, the swash plate pulls the
plunger out or pushes it back from the cylinder to complete the process of oil
absorption and drainage. The oil in the working capacity cavity composed of
plunger and cylinder hole is communicated with the suction and discharge
Chambers of the pump respectively through the oil distribution pan. The variable
mechanism is used to change the inclination Angle of the swash plate. The
displacement of the pump can be changed by adjusting the inclination Angle of
the swash plate. High-pressure plunger pump feed process after the turn CAM
convex part of the past, under the action of spring force, plunger downward
movement, fortress of column space (called the oil pump room) produce vacuum,
when the column inserting end face on the oil hole on the plunger sleeve, filled
with oil in the oil pump diesel by the oil hole in the tao into the pump oil
chamber, piston movement to the next check point, the end of the feed. When the
camshaft turns to the convex part of the CAM and jacks up the roller body, the
plunger spring is compressed, the plunger moves upward, and the fuel is
pressurized. Part of the fuel flows back to the body oil chamber of the
injection pump through the oil hole.
When the plunger on the top cover of the oil hole on the sleeve edge, because
the tolerance clearance of the plunger and barrel is small (0.0015 0.0025 mm) to
make the top of the plunger pump oil chamber sealing oil cavity, a plunger
continues to rise, pump oil chamber of hydraulic lifts quickly, the oil pressure
pump > delivery valve spring force + high pressure oil pipe residual stress,
push the oil valve, high pressure diesel by delivery valve into the high
pressure oil pipe, through the fuel injector is sprayed into the combustion
chamber. During the oil return process of the high pressure plunger pump, the
plunger supplies oil upward. When the ramp on the plunger (stop supply side) is
connected with the oil return hole on the sleeve, the low-pressure oil circuit
of the oil pump chamber communicates with the middle hole, radial hole and the
chute of the plunger head. As a result, the oil pressure drops abruptly, and the
oil outlet valve closes quickly under the action of the spring force to stop the
oil supply.
Then the plunger will go up, and when the CAM's bulge turns around, the
plunger will go down again under the action of the spring. This is where the
next cycle begins. High pressure plunger pump with a plunger principle is
introduced, a high-pressure plunger pump has two one-way valve, and in the
opposite direction, the plunger to appear negative pressure in cylinder when one
direction, then a check valve to open the liquid be inhaled in cylinder, plunger
to another direction, to squeeze the liquid after another one-way valve is
opened, drawn into the cylinder's liquid is expelled. Continuous motion in this
way of working results in a continuous supply of oil.
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