Ventilation device equipped with a membrane for a vehicle liquid tank

A ventilation device for a vehicle liquid tank, comprising:

• a base configured to be fastened to a main wall of the tank,
• a membrane impermeable to a predetermined liquid and permeable to a vapor likely to be produced by the liquid,
• a support on which the membrane is fastened, the support including an inner cylindrical flange forming an opening on which the membrane is fastened, and an outer cylindrical flange extending around and at a distance fro the timer cylindrical flange, and the support being rigidly fastened to an upper wall of the base,
• a cover including an upper wall and a cylindrical side wall, the cylindrical side wall of the cover extending around and at a distance from the inner cylindrical flange of the support, an outer face of the side wall of the cover being fastened to an inner face of the outer cylindrical flange of the support, and an inner face of the side wall of the cover facing and being spaced apart from an outer face of the inner cylindrical flange of the support, and
• at least three pipes suitable for discharging liquid found on an upper side of the membrane from the device, each pipe having an upstream end contiguous with the membrane and extending radially from the membrane, the rest of each pipe extending at an altitude lower than the upstream end when a main axis of the device is vertical, a portion of each pipe descending between the outer face of the inner cylindrical flange and the inner face of the side wall of the cover,
• wherein a downstream end of each pipe is formed by au orifice provided in a wall formed at a junction between the support and the base, each orifice forming a through-hole through the wall formed at the junction between the support and the base, the orifices being evenly distributed angularly around the main axis of the device.