Patent ID: 9464575
Filing Date: 2016-10-11
CPC Classification: F02C,F23Q,F23R

Claim Text:
1. An ignition device for a turbomachine combustion chamber, comprising: two electrodes forming an ignition plug; and an electric power module for electrically powering the electrodes, wherein the electric power module includes a piezoelectric element electrically connected to the electrodes and means for intermittently applying a force to the piezoelectric element to generate between the electrodes an electric voltage sufficient to cause an electric arc therebetween, the means for intermittently applying a force comprising: a fluid flow chamber, including at least two ports for connecting the fluid flow chamber to a circuit for flowing a pressurized fluid, the at least two ports forming respectively at least one intake port and at least one exhaust port for the fluid; a valve for sealing the intake port; a piston bounding the chamber and displaceable along two opposite directions corresponding to an increase and a decrease in volume of the chamber respectively; elastic means biasing the piston into the direction of decrease in volume of the chamber, and acting on the piezoelectric element; and means for controlling the valve, configured to close the valve when the piston, displacing in the direction of increase in the volume of the chamber under pressure of a fluid taken in the chamber by the intake port, and thus compressing the elastic means such that the elastic means applies a force onto the piezoelectric element, reaches a first predetermined position, and to open the valve when the piston, displacing in the direction of decrease in the volume of the chamber under pressure of the elastic means and thus inducing a fluid ejection out of the chamber through the exhaust port, goes beyond a second predetermined position.