Vane Fuel Pump Edit Broadcast

Figure 3 shows the working principle of a typical vane fuel pump. Four steel blades slide along the radial direction of the rotor in the chute opened on the rotor. One end of the blade is pressed against the inner wall of the pump barrel, and the other end is in contact with the floating shaft through a spring. The inner cavity of the rotor is divided into 4 working cavities by the blades and the floating shaft. The pump barrel is fixed on the pump casing, 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. Since the pump barrel and the rotor are eccentric, with the rotation of the rotor, the volume of each working chamber changes continuously. The fuel in the tank is drawn into the working chamber. When the vane turns to the side of the outlet, the volume of the working chamber becomes smaller, and the fuel is squeezed out and flows to the carburetor.

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, and the pressure relief valve is pushed upward, and the excess fuel at the pump outlet is led back to the inlet, so that the pump outlet is connected to the fuel supply pipe between the carburetor The fuel pressure in the road is always kept within the specified value. When the vane pump fails during engine operation, as long as the pump inlet pressure is slightly greater than the outlet pressure, the pressure acting on the upper surface of the bypass valve plate overcomes the fine spring force and opens the bypass valve plate downward, so that the fuel is fully Flow goes 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 within the specified range. If the fuel pressure is abnormal when the pump is working, the pressure regulating device should be checked first, and the pressure should be corrected by the test method of the adjusting screw.