Gaseous fuel vehicle and automatic vent system
A vehicle ( 1 ) equipped with a tank ( 2 ) for storage of a fluid under pressure on the vehicle, the tank being connected to at least one vent channel ( 3 and 33 ), the vent channel leading to a discharge orifice ( 34 ), the vent channel being connected to the tank by means of at least one safety valve, wherein in that the safety valve is a thermal release valve ( 5 ), normally closed and capable of opening spontaneously under the effect of a rise in temperature, the safety valve being installed in a predefined zone of the vehicle and the discharge orifice being remote from the predefined zone.
1. A vehicle comprising a tank for storage of a fluid under pressure, the tank being connected to at least one vent channel that leads to a discharge orifice, wherein
the vent channel is connected to the tank via at least one safety valve,
the safety valve is disposed in a tank cap of the tank,
the safety valve is enclosed between the tank and the vent channel,
the safety valve is a thermal release valve that is normally closed and that may be spontaneously opened under an effect of a rise in temperature,
the thermal release valve includes a release mechanism using a capsule that is destructible under an effect of heat, and
the safety valve is installed in a predefined zone of the vehicle such that the discharge orifice is remote from the predefined zone.
2. A vehicle according to claim 1 , wherein the discharge orifice is situated on the vehicle in a zone as far away as possible from the thermal release valve.
3. A vehicle according to claim 1 , wherein the tank includes an assembly of interconnected cells, the assembly ensuring circulation of the fluid necessary for use of the vehicle.
4. A vehicle according to claim 3 , wherein at least two cells of the interconnected cells are each branched at the vent channel, each of the two cells being connected to the vent channel via least two safety valves, a first of the two safety valves being the thermal release valve, and a second of the two safety valves being a pressure threshold valve that opens automatically above a predefined pressure threshold.
5. A vehicle according to claim 1 , further comprising a floor, wherein the thermal release valve is installed under the floor, and wherein the discharge orifice leads to a surface of the vehicle opposite the floor.
6. A vehicle according to claim 1 , further comprising a fuel cell, wherein the tank is configured to store gaseous hydrogen.
7. A vehicle according to claim 1 ,
wherein the thermal release valve includes a body adapted to be mounted onto the tank, the body including a first boring sealed by a central piston with a head and a skirt delimiting a central hollow zone opened on one side and closed on another side by the head, the body including a central passage defining a second boring, which has a larger diameter than a diameter of the first boring, an interior of the central passage communicating with at least one conduit leading over an exterior wall of the central passage, the central passage being closed by a seal, and
wherein the capsule is interposed between the seal and the head of the central piston.
8. A valve that becomes permanently opened as soon as the valve is subjected for a first time to a rise in temperature to above a predefined temperature, the valve comprising a body adapted to be mounted onto a tank, the body including a first boring sealed by a central piston that includes a head and a skirt delimiting a central hollow zone opened on one side and closed on another side by the head, the body including a central passage defining a second boring, which has a larger diameter than a diameter of the first boring, an interior of the central passage communicating with at least one conduit leading over an exterior wall of the central passage, the conduit extending at an oblique angle with respect to the central passage, the central passage being closed by a seal, wherein a capsule is interposed between the seal and the head of the piston.