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The total reciprocating travel L of the plunger pump is constant, which is determined by the lift of the cam. The amount of oil supply per cycle of the plunger depends on the oil supply stroke, which is variable without camshaft control. The starting time of fuel supply does not change with the change of fuel supply stroke. Turning the plunger can change the end time of oil supply, thus changing the amount of oil supply. When the plunger pump is working, under the action of the cam and plunger spring on the camshaft of the injection pump, the plunger is forced to move up and down to complete the pumping task. The pumping process can be divided into the following two stages.
Oil inlet process
When the convex part of the cam turns, the plunger moves downward under the action of the spring force, and the upper space of the plunger (called the pump oil chamber) generates vacuum. When the upper end face of the plunger opens the oil inlet hole on the plunger sleeve, the diesel filled in the oil passage of the upper body of the pump enters the pump oil chamber through the oil hole, and the plunger moves to the bottom dead center, and the oil inlet ends
Oil return process
The plunger supplies oil upward. When the chute (stop supply side) that goes up to the plunger is connected with the oil return hole on the sleeve, the low-pressure oil circuit of the pump oil chamber communicates with the central hole, radial hole and chute at the head of the plunger. The oil pressure drops suddenly, and the oil outlet valve closes quickly under the action of the spring force to stop oil supply. After that, the plunger will go up. When the convex part of the cam turns, the plunger will go down again under the action of the spring. The next cycle begins.
The plunger pump is introduced based on the principle of a plunger. There are two check valves on a plunger pump, and the direction is opposite. When the plunger moves in one direction, negative pressure appears in the cylinder. At this time, a check valve opens and the liquid is sucked into the cylinder. When the plunger moves in another direction, the liquid is compressed and the other check valve is opened, and the liquid sucked into the cylinder is discharged. This working mode forms continuous oil supply after continuous movement.
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