Working Principle of Yuchai Diesel Generator Blade Fuel Pump

Yuchai diesel generator set is a widely circulated unit product in the current market in China, which is favored by users. As there are many types of fuel pumps used in Yuchai diesel generator set, Starlight Power will focus on sharing the working principle of the vane type fuel pump used in Yuchai diesel generator set.

The working principle of a typical vane fuel pump used in Yuchai diesel generator set. Four steel blades slide radially along the rotor in the chute opened on the rotor. One end of the blade presses against the inner wall of the pump barrel, and the other end contacts the floating shaft through a spring. The internal cavity of the rotor is divided into 4 working cavities by the blade and floating shaft. The pump barrel is fixed on the casing of the pump, and there are oil inlet and outlet ports on both sides. The power of the rotor can be engine driven or motor driven.

When the rotor works, it rotates clockwise. Because the pump barrel and rotor are eccentric, the volume of each working chamber changes with the rotation of the rotor. When the blade turns to the inlet side, the volume of the working chamber becomes larger, creating a local low-pressure area, which sucks the fuel in the oil tank into the working chamber. When the blade turns to the outlet side, the volume of the working chamber becomes smaller, extruding the fuel and flowing to the vaporizer.

When the pump outlet pressure is greater than the specified value, the pressure acting on the lower surface of the pressure relief valve overcomes the spring force, opens the pressure relief valve upward, guides the excess fuel at the pump outlet back to the inlet, and keeps the fuel pressure in the fuel supply pipeline between the pump outlet and the vaporizer within the specified value. When the vane pump fails during engine operation, as long as the inlet pressure of the pump is slightly higher than the outlet pressure, the pressure acting on the upper surface of the bypass valve plate overcomes the thin spring force and opens the bypass valve plate downward so that the full flow of fuel flows to the engine carburetor.

The head of the pump is equipped with a fuel supply pressure regulating device, which can automatically adjust the fuel pressure at the pump outlet to be within the specified range. If the fuel pressure is abnormal when the pump is working, the pressure regulating device shall be checked first, and the pressure shall be corrected by means of test through adjusting screws.

It can be seen from the working principle of the vane type fuel pump of Yuchai diesel generator set above that its function is to suck out the oil in the fuel tank and deliver it to the fuel supply pipe after being pressurized, thus generating a certain fuel pressure to help the operation of Yuchai diesel generator set.

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