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Automobile Diesel Engine Excavator Tractor Eletric Fuel Pump HEP-02A
Products detail
Products name | Automobile Diesel Engine Excavator Tractor Eletric Fuel Pump |
Part number | HEP-02A |
Car make | Excavator Tractor |
Feature | 12V or 24V |
Color | with silver color and gold color |
Condition | 100% new |
Sample | Offer |
Warranty | 12 months |
working principle
The electric fuel pump is composed of a pump body, a DC motor and a
shell. Its basic working principle is that after the DC motor is
energized, the rotor in the pump housing is driven to rotate at a
high speed. The cut surface at the lower end of the rotor shaft is
combined with the cut surface of the inner hole of the impeller, so
that when the rotor rotates, the impeller is driven to rotate in
the same direction through the rotor shaft. During the high-speed
rotation of the impeller, vacuum low pressure is created at the oil
inlet, and the filtered fuel is sucked from the oil inlet of the
pump cover. The sucked fuel is pressurized by the fuel pump
impeller and enters the pump housing and then passes through the
oil outlet pressure. To provide fuel with a certain pressure for
the fuel system. The structure of the DC motor includes a permanent
magnet fixed on the inner wall of the pump casing, a rotor capable
of generating a magnetic torque after being energized, and a
graphite carbon brush assembly installed on the upper end of the
pump casing. The carbon brush is in elastic contact with the
commutator on the armature rotor, and its lead is connected to the
plug-in wiring electrode of the shell. The outer ends of the
electric fuel pump casing are crimped and riveted to become a
non-detachable assembly.
Fuel pump type
In the fuel system, the electric fuel pump is responsible for
supplying fuel with a certain pressure, and its fuel delivery per
unit time is more than 8 times more than the fuel consumption per
unit time of the engine's rated power condition. A large amount of
fuel is continuously returned to the fuel storage tank through the
oil pressure regulator, which not only controls the oil pressure,
but also cools the fuel pipeline to avoid air lock.
Although the specific structures of electric fuel pumps are
diverse, they are all composed of pump oil components, permanent
magnet motors, end caps and shells. The shell crimping rivets the
other parts into a whole. The rotor (or pump wheel) of the oil pump
assembly is coaxial with the rotor of the electric motor. The fuel
is output from the pump oil assembly through the motor and the end
cover. The terminal of the motor is arranged on the end cover. A
one-way valve is installed in the oil outlet of the end cover. When
the engine is stopped, the one-way valve is closed, and the fuel in
the fuel pipeline will not return to the fuel transfer pump and
maintain a certain residual oil pressure, which is beneficial to
the next quick start. In addition, there is an overpressure relief
valve (safety valve) installed on the support or end cover of the
pump oil assembly. When the fuel line is blocked and the oil
pressure in the system exceeds the allowable value, it opens to
overflow and relieve the pressure. In this way, damage to the oil
pipe or the oil transfer pump can be avoided.
Different types of electric fuel pumps are mainly different in pump
oil components. According to the working principle, the pump oil
components can be divided into two categories: positive
displacement pump and fluid power pump. Positive displacement pumps
rely on changes in the volume of the pump cavity to suck and press
oil, so they are intermittent oil delivery, with greater oil
pressure fluctuations and vibration and noise, but the working
pressure is higher. Roller pumps, gear pumps and vane pumps are all
positive displacement pumps. The working pressure of roller pump is
about 200kPa, gear pump can reach 400kPa, and the working pressure
of vane pump can be higher. The first two pumps are used more.
The fluid power pump relies on the pump wheel to drive the fuel
flow. The fuel in the flow generates oil pressure due to the change
of momentum. It is a continuous oil pump with small pressure
fluctuations but low working pressure. It is suitable for large oil
volume and low oil pressure. Occasions. Axial pumps, centrifugal
pumps, turbo pumps and side channel pumps are all hydrodynamic
pumps. The working pressure of the axial flow pump and the side
tank pump is about 100kPa, and the other two pumps are about
300kPa. Turbo pumps and side channel pumps are used more.
Products picture