Plunger pump works

Plunger plunger reciprocating stroke L is the same, depending on the lift of the cam. The amount of oil supplied to the plunger per cycle depends on the fueling stroke and the fueling stroke is variable regardless of camshaft control. Fuel supply starting time does not vary with the supply of travel changes. Turn the plunger can change the fuel supply end time, thus changing the fuel supply. Piston pump work, the camshaft in the fuel injection pump camshaft and the role of the plunger spring, forcing the plunger up and down reciprocating motion, thus completing the task of pumping oil, pump oil process can be divided into the following three stages. Into the oil process when the convex part of the cam turn, under the action of the spring force, the plunger moves downward, the upper space of the plunger (called pump oil chamber) to produce a vacuum, when the plunger on the end face of the plunger sleeve After the oil inlet hole is opened, the diesel fuel filled in the upper body oil passage of the oil pump enters the oil pump chamber through the oil hole, and the plunger moves to the bottom dead center, and the oil enters the end. Oil supply process When the cam shaft to the raised part of the cam lift the roller body, the plunger spring is compressed, the plunger upward movement, the fuel pressure, part of the fuel flow through the hole back to the fuel injection body oil chamber. When the plunger top cover the upper edge of the sleeve into the oil hole, due to the small clearance between the plunger and sleeve (0.0015-0.0025mm) so that the top of the plunger pump chamber becomes a sealed oil chamber, the plunger Continue to rise, the pump oil chamber pressure rapidly increased, pump oil pressure> spring force of the valve + high pressure tubing remaining pressure, open the valve, high pressure diesel oil into the high pressure tubing through the injector spray Into the combustion chamber. Oil return process up the plunger, when up to the plunger on the chute (stop for the side) and the sleeve on the return hole, the pump chamber low pressure oil and the plunger head of the hole and the hole Radial hole and chute communication, a sudden drop in oil pressure, the oil valve in the spring force quickly shut down, stop the fuel supply. After the plunger has to go up, when the convex part of the cam turn, under the action of the spring, the plunger down again. At this point they started the next cycle. Piston pump to a plunger principle, a plunger pump has two one-way valve, and the opposite direction, the plunger movement to a negative pressure within the cylinder, then a one-way valve to open the liquid is inhaled In the cylinder, when the plunger moves in the other direction, the other one-way valve after the liquid is compressed is opened, and the liquid sucked into the cylinder is discharged. This work continues after the formation of a continuous movement of oil.

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