Pump principle of operation and maintenance

Industrial Hydraulic Pumps

Pump principle of operation and maintenance

Pump principle of operation is provided by the pump motor power, driven by the drum gear coupling gear rotation. Crankshaft gear reducer driven by the rotation. Through the connecting rod, the rotary motion into reciprocating motion for the crosshead and plunger. When the plunger back dead point moves, and gradually increase the pump chamber volume, lower pressure pump chamber, when the pump chamber when the pressure below the inlet pressure, inlet suction valve in the open under pressure, the liquid is inhaled; when the plunger dead point moves forward, pressure pump chamber, then close the suction valve, discharge valve is opened, liquid is squeezed out liquid tanks, reached the suction and discharge purposes. The total stroke reciprocating piston plunger cam lift by the decision.

Plunger oil supply per cycle depends on oil trip trip oil from camshaft control, is variable. Start time does not change oil change oil change schedule. Turn the end of the plunger can change the oil time to change the fuel supply. Piston pump work, the fuel injection pump cam on the cam and plunger under the action of the spring, forcing the plunger for the upper and lower reciprocating motion, thus completing the task of pumping the oil, pump oil can be divided into three phases. When the cam bumps turn over, the role of force in the spring, the plunger moves downward, the plunger upper space (known as the pumping chamber) of vacuum created when the plunger on the end to put on the progress of the plunger hole opened, filled with the oil channel in the upper body pump diesel into the pumping chamber by the hole, the plunger movement to the next stop point, feed the end.

When the protruding part of the camshaft to the cam wheel from the top body, the plunger spring is compressed, the plunger upward, fuel pressure, part of the upper body fuel injection pump oil through oil hole flow back into the chamber. When the plunger cover the top hole of the upper edge of the sleeve upward mobility, because the plunger and the sleeve with a small gap (0.0015-0.0025mm) to the oil pump plunger at the top of the oil chamber into a sealed chamber, column Cyprus continues to rise, the hydraulic pump oil chamber increased rapidly, pumping pressure> the valve spring force + high pressure oil remaining pressure, open the outlet valve, high pressure diesel fuel through a valve into the high-pressure pipeline, through the injector sprayed into the combustion chamber. Plunger up oil, when the plunger up to the chute (suspension side) and the sleeve on the back hole connected, the pump oil chamber low-pressure oil line will be in the head with the plunger hole and radial holes and the skewed communications, oil pressure suddenly dropped, the valve under the action of spring force in the rapid shut down, stop oil supply.

Since then even up the plunger, when the bulge cam switch over, under the action of the spring, plunger further down. Then began the next cycle. Piston for the principle of introducing a plunger, a piston pump with two one-way valve, and in the opposite direction, the direction of plunger movement to a negative pressure occurs when the cylinder, then a one-way valve to open the liquid is drawn cylinder, piston movement in the other direction, the liquid is compressed to open another one-way valve, sucked the tank is drained. This work formed a continuous row movement after oil.

Piston length of life, and the usual maintenance, quality and quantity of hydraulic oil, oil cleanliness and other related. To avoid the pellet on the piston friction caused by wear and other vice, but also an effective way to extend piston life. Replacement parts in the repair should be used in the original production of parts, these parts are sometimes imitation parts prices than other more expensive, but better quality and stability, if the purchase price of cheap imitation parts in the short term appears to be cost savings, but this brings out the hidden dangers of the piston may cause more damage to use.

A flat valve plate assignment and two forms spherical assignment. Spherical Flow of friction pairs, face scratches in the cylinder with relatively shallow stream, through the grinding means to repair; cylinder with flow surface grooves deeper, they would first use of "surface engineering" means filled trench, then grinding not blindly grinding, in order to prevent oil leakage out of the copper layer thinning or steel base.

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