Automobiles Electric Fuel Pump Explosion-proof Electric Gasoline Pump
No.TY-212
Fuel pump is a professional term in the auto parts industry. It is one of the basic components of the EFI vehicle fuel injection system, located inside the vehicle fuel tank, the fuel pump works when the engine is started and the engine is running, if the engine is stopped and the ignition switch is still ON, the HFM-SFI control module turns off the power of the fuel pump to avoid accidental ignition.
The fuel pump delivers high pressure fuel to the distribution line to ensure a continuous supply of fuel to the nozzle The fuel pump is composed of an electric motor, pressure limiter, inspection valve, the electric motor actually works in the fuel oil pump shell, do not worry, because there is nothing in the shell that can be ignited, the fuel can lubricate and cool the fuel motor, the oil outlet is equipped with an inspection valve, the pressure limiter is located on the pressure side of the oil pump shell, with a channel leading to the oil inlet. ZYB type ignition booster fuel pump is suitable for transporting diesel oil, heavy oil, residual oil, fuel oil and other media, especially suitable for the fuel pump of the burner in the mixing station of road and bridge engineering, is an ideal product to replace the imported products. ZYB type pressurized fuel pump is not suitable for transporting highly volatile or low flash point liquids, such as ammonia, benzene, etc. When the rotor rotates, the roller is pressured outward by centrifugal force, like a rotating oil seal, the rotor rotates, the pump works, suction fuel from the oil inlet, and pressure the fuel from the oil outlet into the fuel system, when the oil pump is closed, the inspection valve of the oil outlet is closed to prevent the fuel from flowing back to the tank through the fuel pump, and the fuel pipe pressure maintained by the inspection valve is called "residual pressure". The maximum pump pressure of the fuel pump depends on the standard of the pressure limiter. If the fuel pump pressure exceeds the predetermined pressure limit, the pressure limiter will open the bypass to allow the fuel to flow back to the fuel pump inlet.
Electric centrifugal booster pump In some aircraft, the electric centrifugal booster pump is used as an auxiliary fuel pump for the fuel system. The motor is usually mounted on the wing SPAR corresponding to the lower position of the fuel tank, while the pump body is immersed in the fuel at the bottom of the tank. Seal between pump impeller and motor to prevent fuel or oil vapor from leaking into motor. When the fuel enters the pump body, the high-speed rotating impeller throws the fuel outwards along the radial direction, generating centrifugal force, increasing the fuel pressure, and transferring the fuel to the system. The rotary agitation of the pump also has the effect of separating the air and oil vapor from the fuel, so that the fuel supplied to the engine does not contain oil vapor.
Plunger electric fuel pump Due to the high cost of the electric centrifugal booster pump, many small aircraft fuel systems use the electric plunger pump as the fuel system auxiliary fuel pump. The plunger pump is usually installed in parallel with the engine-driven diaphragm type fuel pump so that they supply fuel to the engine individually or jointly. The plunger type fuel pump is a pulsating pump, which consists of a south electromagnetic coil, a plunger, a calibration spring and two one-way valves (net 9-14). The electromagnetic coil is wound on a brass tube connecting two oil chambers. Calibrate the spring's elasticity to push up the plunger and the coil's electromagnetic force to push down the plunger. One one-way valve is installed in the middle of the plunger and the other is installed in the middle of the bottom of the brass tube extension in the oil inlet chamber. When the plunger pump is not energized, the calibrated spring force pushes the plunger up along the brass tube, and the plunger will attract a magnet that makes contact through the pivot. When energized, the current flows through the electromagnetic wire through the contact to generate an electromagnetic force, drawing the plunger down into the coil part. At this time, the fuel in cavity B is directed to the upper flow plunger through the one-way valve. When the plunger moves down to the middle of the electromagnetic coil, the magnet will no longer be attracted, the contact will jump, and the electromagnetic coil will be powered off. The electromagnetic force disappears. At this time, the calibration spring pushes the plunger, and the C-chamber fuel is extruded to the engine. At the same time, fuel from the tank is pumped into cavity A, and then through the bottom one-way valve into cavity B, ready for the next fuel supply cycle. If the engine receives the full output of the pump, the pump pulsation frequency is very high; However, if the engine carburetor idle valve is closed, or there is fuel pressure between the carburetor and the pump, the pump will be in a low-speed pulsating state
Vane fuel pump The working principle of a typical vane fuel pump is that four steel blades slide radial along the rotor in a chute opened on the rotor, one end of the blade presses the inner wall of the pump barrel, and the other end contacts the floating shaft through a spring. The inner cavity of the rotor is divided into four working cavities by the blade and the floating shaft. The pump barrel is fixed on the shell of the pump, and there are inlet and outlet ports on both sides. The power of the rotor can be engine driven or motor driven. The rotor works clockwise rotation, because the pump barrel and the rotor are eccentric, with the rotation of the rotor, the volume of each working chamber is constantly changing, when the blade turns to the inlet side, the working chamber volume becomes larger, resulting in a local low pressure area, the fuel in the tank is sucked into the working chamber. When the blade turns to the outlet side, the working cavity volume 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, opens the pressure valve up the top, and guides the excess fuel at the pump outlet back to the inlet, so that the fuel pressure in the oil supply pipeline between the pump outlet and the carburetor is always maintained within the specified value. When the vane pump fails during the 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 to make the full flow of fuel flow to the engine carburetor. The head of the pump is equipped with an oil 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 is corrected by testing the adjusting screw.
