Plunger pump working principle described in detail as follows: Plunger injection pump works is the use of plunger reciprocating motion within the plunger sleeve oil and pressure, each piston and plunger sleeve only one cylinder fuel. For a single cylinder diesel engine, a single piston pump consists of a single pump; for a multi-cylinder diesel engine, multiple sets of oil pumps supply oil to each cylinder respectively. Medium and low-power diesel engine most of the cylinder pump oil institutions assembled in the same shell, known as the multi-cylinder pump, pump group where each group is called the sub-pump. Plunger pump works, the structure of the sub-pump, the key part of the pump oil agencies. Pump oil institutions mainly by the plunger coupling (plunger and plunger sleeve), the Valve of the oil (oil valve and the valve seat) and other components. The lower part of the plunger is fixed with an adjusting arm through which the position of the plunger can be adjusted and rotated. The oil outlet valve in the upper part of the plunger is pressed by the oil outlet valve spring on the oil valve seat, the lower end of the plunger is in contact with the pad installed in the roller body, the plunger spring pushes down the plunger through the spring seat, Keep in contact with the cam on the camshaft. Fuel injection camshaft driven by the diesel engine crankshaft drive. For four-stroke diesel engine crankshaft turn two laps, injection pump camshaft turn around. Plunger pump working principle. A linear (or helical) chute is milled on the cylindrical surface of the plunger. The chute chamber communicates with the pump chamber above the plunger. There are two circular holes in the plunger sleeve communicating with the low-pressure oil chamber on the injection pump body. The plunger is driven by a cam and reciprocates linearly within the plunger sleeve. In addition, it can rotate about its own axis over a range of angles. (1) Oil absorption process When the plunger moves down, the oil is sucked in from the low pressure oil chamber through the oil inlet hole and filled the pump chamber. (2) Pressurization During the upward movement of the plunger from bottom dead center, initially a portion of the fuel is squeezed from the pump chamber to the low pressure chamber until the upper cylindrical surface of the plunger completely seals the two oil holes. After the plunger continues to rise, the plunger pressure on the top of the fuel quickly increased enough to overcome the force of the valve spring, the valve began to rise. When the cylinder out of the valve ring out of the valve seat, the high-pressure fuel from the pump chamber through the high-pressure tubing to the injector. When the fuel pressure is higher than the injection pressure of the fuel injector, the fuel injector begins to inject fuel. (3) back to the process when the plunger continues to move up, the chute and the hole began to connect, so the pump chamber pressure drops rapidly, the oil reading in the spring pressure immediately under the action of return, the fuel pump to stop feeding. After this, the plunger continues to move up until the cam reaches the highest lift, but no more pump oil. Piston oil pump working principle, from the pump oil process shows that by the maximum radius of the drive cam curve of the plunger path h (that is, the plunger between the top and bottom dead center distance) is certain, but not In the entire plunger on the travel hg are within the fuel supply, injection pump only after the plunger completely closed oil hole to plunger chute and hole before the start of this part of the plunger stroke hg only pump. hg known as the plunger effective stroke. Obviously, the amount of oil pumped by the fuel injection pump depends on the effective stroke length. Therefore, the fuel injection pump can change the fuel supply amount according to the diesel engine working condition only by changing the effective stroke. Generally by changing the relative position of the plunger chute and the plunger sleeve oil hole to achieve the steering direction of the plunger, the effective stroke of the fuel supply is increased; otherwise reduced. (4) stop the oil state When the plunger to the plunger can not completely close the hole position, so the effective stroke is zero, that is, the pump is not pumping oil. Plunger pump details of the work is like this.
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