Solenoid valve for fuel cell

A solenoid valve for discharging a reactant gas from a fuel cell, said solenoid valve being incorporated in a fuel cell system having a fuel cell stack having an anode and a cathode, said solenoid valve comprising:

• a valve housing having a first port for introducing the reactant gas and a second port for discharging the reactant gas introduced from said first port;
• a solenoid unit disposed in a casing joined to said valve housing, said solenoid unit being energizable by a current;
• a shaft axially displaceable when said solenoid unit is energized;
• a valve head disposed in said valve housing and engaging an end of said shaft;
• a valve seat, said valve head being seatable on and unseatable from said valve seat when said shaft is displaced;
• a filter connected to said first port, for removing dust particles contained in said reactant gas, said filter comprising a bottomed cylindrical mesh member;
• an elastic member mounted on an end of said valve head that faces said valve seat, said elastic member being made of an elastic material;
• and
• a restriction mounted upstream of said filter in said first port, said restriction having an orifice for restricting a flow rate of the reaction gas supplied into said valve housing,
• wherein a surface of said elastic member has a fluorine coating or said elastic member is made of a fluorine-based rubber material,
• wherein said solenoid valve is disposed in a hydrogen discharger which is connected to a circulation passage interconnecting an ejector and the anode, said ejector attracting the reactant gas discharged from the anode;
• and
• wherein said hydrogen discharger discharges an excessive reactant gas in said fuel cell stack out of the fuel cell system through said circulation passage.

A solenoid valve for discharging a reactant gas from a fuel cell, said solenoid valve being incorporated in a fuel cell system having a fuel cell stack having an anode and a cathode, said solenoid valve comprising:

• a valve housing having a first port for introducing the reactant gas and a second port for discharging the reactant gas introduced from said first port;
• a solenoid unit disposed in a casing joined to said valve housing, said solenoid unit being energizable by a current;
• a shaft axially displaceable when said solenoid unit is energized;
• a valve head disposed in said valve housing and engaging an end of said shaft;
• a valve seat, said valve head being seatable on and unseatable from said valve seat when said shaft is displaced;
• a filter mounted in said first port for removing dust particles contained in said reactant gas, said filter having a mesh size or opening diameter of 100μm or less;
• an elastic member mounted on an end of said valve head that faces said valve seat, said elastic member being made of an elastic material;
• and
• a restriction mounted upstream of said filter in said first port, said restriction having an orifice for restricting a flow rate of the reaction gas supplied into said valve housing,
• wherein a surface of said elastic member has a fluorine coating or said elastic member is made of a fluorine-based rubber material,
• wherein said solenoid valve is disposed in a hydrogen discharger which is connected to a circulation passage interconnecting an ejector and the anode, said ejector attracting the reactant gas discharged from the anode;
• and
• wherein said hydrogen discharger discharges an excessive reactant gas in said fuel cell stack out of the fuel cell system through said circulation passage.

A solenoid valve for discharging a reactant gas from a fuel cell, said solenoid valve being incorporated in a fuel cell system having a fuel cell stack having an anode and a cathode, said solenoid valve comprising:

• a valve housing having a first port for introducing the reactant gas and a second port for discharging the reactant gas introduced from said first port;
• a solenoid unit disposed in a casing joined to said valve housing, said solenoid unit being energizable by a current;
• a shaft axially displaceable when said solenoid unit is energized;
• a valve head disposed in said valve housing and engaging an end of said shaft;
• a valve seat, said valve head being seatable on and unseatable from said valve seat when said shaft is displaced;
• a filter connected to said first port, for removing dust particles contained in said reactant gas, said filter having a mesh size or opening diameter of 100μm or less;
• an elastic member mounted on an end of said valve head that faces said valve seat, said elastic member being made of an elastic material;
• and
• a restriction mounted upstream of said filter in said first port, said restriction having an orifice for restricting a flow rate of the reaction gas supplied into said valve housing,
• wherein a surface of said elastic member has a fluorine coating or said elastic member is made of a fluorine-based rubber material,
• wherein said solenoid valve is disposed in a hydrogen discharger which is connected to a circulation passage interconnecting an ejector and the anode, said ejector attracting the reactant gas discharged from the anode;
• and
• wherein said hydrogen discharger discharges an excessive reactant gas in said fuel cell stack out of the fuel cell system through said circulation passage.