| 摘要 |
PURPOSE:To control the flow amount of fuel correctly and easily with a simple structure by a method wherein the mechanical vibration of a piezo vibrtor, which can directly be controlled electrically, is acted on the fuel directly to deliver the fuel. CONSTITUTION:When an AC voltage is impressed on lead wieres 11, the piezo vibrator 6 vibrates with a frequency equal to the same of the AC voltage. When the piezo vibrator 6 is bent, the volume of a pressurizing chamber 5 is enlarged and a non-return valve 9 is opened while the non-return valve 10 is closed and the fuel is sucked into the pressurizing chamber 5 from a pipe 3 for sucking through a inflow path 7. When the piezo vibrator 6 is returned to the original shape thereof, the volume of the pressurizing chamber 5 is decreased, the internal pressure thereof is increased and the non-return valve 9 is closed while the non-return valve 10 is opened and the fuel is delivered into a delivery pipe 4 from the pressurizing chamber 5 through an outflow path 8. By repeating above- described motions, the fuel is flowed. The delivery flow amount of fuel in the pump 1 may be controlled by controlling variably the electric source voltage between lead wires 11. |
