The role of high pressure oil pump
The oil outlet of the high-pressure oil pump enters the oil cooler, and the oil cooler comes out and then enters the oil filter. After coming out of the oil filter, there are two ways, one way is decompressed and then supplied
All the way to the control oil. There may be one or two accumulators in the pipeline.
Its function is to improve the fuel pressure and high pressure injection to achieve atomization effect. The high pressure oil pump is mainly used as the power source of hydraulic devices such as jack, upsetting device, extruder and tie-flower machine.
The function and working principle of automotive high pressure fuel pump
The high pressure oil pump is the interface between the high pressure oil circuit and the low pressure oil circuit. Its function is to generate the fuel pressure in the common rail pipe by controlling the fuel output. Under all conditions, it is mainly responsible for providing sufficient high pressure fuel to the common rail.
High pressure oil pump is mainly used as jack, upsetting device, extruder, tie-flower machine and other hydraulic pressure
. The installation sequence of high pressure oil pump is as follows
In the process of high pressure oil pump, in order to prevent sundries from falling into the machine, all holes of the unit should be covered. The unit is placed on the foundation with buried anchor bolts, and a pair of wedge pads are used for correction between the base and the foundation. Correct the concentricity of pump shaft and motor shaft, allow the deviation of 0.1 mm on the outer circle of coupling shaft road; The clearance of the two coupling planes should ensure 2 ~ 4 mm, (small pump takes small value) clearance should be uniform, allow 0.3 mm.
Working principle of high pressure fuel pump
1. Oil absorption stroke
In the process of oil absorption, rely on the downward flow of the pump piston to provide the power of oil absorption, and open the oil inlet valve, the fuel is sucked into the pump chamber. In the pump
In the last 1/3 of the segment, the fuel pressure regulator is energized so that the intake valve remains open for oil return during the initial upward movement of the pump piston.
The function and working principle of automotive high pressure fuel pump
2. Oil return stroke
To control the actual supply
The oil intake valve is in the pump
The initial upward motion is still open, and excess fuel is pushed back to the low pressure end by the pump piston. The function of the retarder is to absorb what is produced in this process
Fluctuation.
The function and working principle of automotive high pressure fuel pump
3. Pump oil stroke
At the beginning of the pump travel, the fuel pressure regulating valve power off, so that the oil inlet valve in the pump chamber increased pressure and the valve in the closing spring together to close.
Pump piston upward in the pump chamber to produce pressure, when the pressure exceeds the oil rail pressure, the oil outlet valve is opened, fuel is pumped into the oil rail.
