Plunger pump is a hydraulic system is an important device. Piston pump rated voltage is high, convenient flow adjustment and other advantages of the more widely used piston pump reasons. Plunger pump works mainly three processes: into the oil process, the fuel supply process, back to the oil process. Piston pump works: 1, the process of oil into the cam when the convex part of the turn, under the action of the spring force, the plunger down, the upper space of the plunger (called pump oil chamber) vacuum, when The upper end face of the plunger opens the oil inlet hole on the plunger sleeve, and the diesel oil filled in the upper body oil passage of the oil pump enters the pump oil chamber through the oil hole. The plunger moves to the bottom dead center and the oil enters the end. 2, the fuel 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 upper body oil injection pump. 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. 3, back to the process of plunger upward oil supply, when up to the plunger on the chute (stop for the edge) and the sleeve connected to the oil return hole, low pressure oil pump chamber and the plunger head in the middle Hole and radial hole and oblique groove communication, a sudden drop in pressure, the oil valve in the spring force quickly closed, 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 principle is mainly based on the principle of a plunger, a plunger pump has two one-way valve, and the opposite direction, the plunger moves to a negative pressure when the cylinder, then a one-way valve When the liquid is sucked into the cylinder and the piston 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. We should also know how to use the process of maintenance: If there is no evidence of corrosion of the plunger corrosion should be promptly replaced; check the plunger tightness, check tappet and so on. We understand the working principle of the plunger pump, but also know that these checks are necessary for long-term use of the plunger pump plays an important role.
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