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US 8,507,138 B2Granted
Ejector for fuel cell system
AssigneeKeihin Corporation
InventorsKouichi Yamada, Kazunori Fukuma, Makoto Wada
Life of this patent
Estimating the term…
Abstract
An ejector for a fuel cell system of the present invention includes a nozzle having a nozzle hole for discharging hydrogen supplied via an inlet port of an ejector body, a diffuser for mixing hydrogen discharged from the nozzle hole and hydrogen off-gas discharged and returned via a circulation passage from a fuel cell, a needle displacing in the axial direction by a driving force of a solenoid, and a bearing member held in a hollow portion of the nozzle, and having a through hole that movably supports the needle in the axial direction.
Claims12
An ejector for a fuel cell system comprising:
- an ejector body including an inlet port supplied with fuel gas from a fuel gas supply means, an outlet port communicated with a fuel gas supply passage communicated with a fuel cell, and a suction port communicated with a circulation passage and for suctioning fuel off-gas discharged and returned from the fuel cell;
- a nozzle having a nozzle hole for discharging fuel gas supplied via the inlet port;
- a diffuser for mixing the fuel gas discharged from the nozzle hole and a fuel off-gas discharged and returned via the circulation passage from the fuel cell;
- a nozzle-hole section area regulating mechanism including a needle axially extending in a hollow portion of the nozzle, the nozzle moving forward and backward in the nozzle hole so as to regulate a discharge section area of the nozzle hole;
- and
- a bearing member held in the hollow portion of the nozzle and having a through hole through which the needle is movably supported in the axial direction, wherein
- on a radial circumferential face of the nozzle, there are provided plural fuel gas introduction holes that introduce the fuel gas supplied from the inlet port into the hollow portion of the nozzle.
4 more elements
An ejector for a fuel cell system comprising:
- an ejector body including an inlet port supplied with fuel gas from a fuel gas supply means, an outlet port communicated with a fuel gas supply passage communicated with a fuel cell, and a suction port communicated with a circulation passage and for suctioning fuel off-gas discharged and returned from the fuel cell;
- a nozzle having a nozzle hole for discharging fuel gas supplied via the inlet port;
- a diffuser for mixing the fuel gas discharged from the nozzle hole and a fuel off-gas discharged and returned via the circulation passage from the fuel cell;
- a nozzle-hole section area regulating mechanism including a needle axially extending in a hollow portion of the nozzle, the needle moving forward and backward in the nozzle hole so as to regulate a discharge section area of the nozzle hole;
- and
- a bearing member held in the hollow portion of the nozzle and having a through hole through which the needle is movably supported in the axial direction, wherein
- the bearing member is formed of a cykindrical body having the through hole in the axial direction, and
- by satisfying the following formula, the needle is held to be out of contact with an inner diameter face of the nozzle hole of the nozzle:
- (D1−D2)(L1+L2)/L1<(D4−D3)/2
- where
- D1:
- an inner diameter of the through hole of the bearing member
- D2:
- an outer diameter of the needle at a portion thereof axially supported by the bearing member
- D3:
- an outer diameter of the needle at a portion thereof inserted in the nozzle hole
- D4:
- an inner diameter of the nozzle hole of the nozzle
- L1:
- an axial length of the bearing member
- L2:
- an axial distance between the bearing member and the nozzle hole.
19 more elements
An ejector for a fuel cell system comprising:
- an ejector body including an inlet port supplied with fuel gas from a fuel gas supply means, an outlet port communicated with a fuel gas supply passage communicated with a fuel cell, and a suction port communicated with a circulation passage and for suctioning fuel off-gas discharged and returned from the fuel cell;
- a nozzle having a nozzle hole for discharging fuel gas supplied via the inlet port;
- a diffuser for mixing the fuel gas discharged from the nozzle hole and a fuel off-gas discharged and returned via the circulation passage from the fuel cell;
- a nozzle-hole section area regulating mechanism including a needle axially extending in a hollow portion of the nozzle, the needle moving forward and backward in the nozzle hole so as to regulate a discharge section area of the nozzle hole;
- a bearing member held in the hollow portion of the nozzle and having a through hole through which the needle is movably supported in the axial direction;
- an electromagnetic actuator that includes a movable core attracted to a fixed core due to a coil excitation and displaces the needle along with the movable core in the axial direction;
- and
- a needle holding mechanism provided between the movable core and the needle, and holding one end portion of the needle on an opposite side of the nozzle hole in such a manner that the held one end of the needle moves in the radial direction.
5 more elements
An ejector for a fuel cell system comprising:
- an ejector body including an inlet port supplied with fuel gas from a fuel gas supply means, an outlet port communicated with a fuel gas supply passage communicated with a fuel cell, and a suction port communicated with a circulation passage and for suctioning fuel off-gas discharged and returned from the fuel cell;
- a nozzle having a nozzle hole for discharging fuel gas supplied via the inlet port;
- a diffuser for mixing the fuel gas discharged from the nozzle hole and a fuel off-gas discharged and returned via the circulation passage from the fuel cell;
- a nozzle-hole section area regulating mechanism including a needle axially extending in a hollow portion of the nozzle and for regulating a discharge section area of the nozzle hole;
- a solenoid including a movable core that displaces along with the needle toward a fixed core due to a coil excitation;
- and
- a stopper of elastic material provided on the movable core, the stopper configured to abut an adjacent member that is external to the movable core so as to restrict the displacement of the movable core.
4 more elements
An ejector for a fuel cell system comprising:
- an ejector body including an inlet port supplied with fuel gas from a fuel gas supply means, an outlet port communicated with a fuel gas supply passage communicated with a fuel cell, and a suction port communicated with a circulation passage and for suctioning fuel off-gas discharged and returned from the fuel cell;
- a nozzle having a nozzle hole for discharging fuel gas supplied via the inlet port;
- a diffuser for mixing the fuel gas discharged from the nozzle hole and a fuel off-gas discharged and returned via the circulation passage from the fuel cell;
- a nozzle-hole section area regulating mechanism including a needle axially extending in a hollow portion of the nozzle and for regulating a discharge section area of the nozzle hole;
- and
- a solenoid including a movable core that displaces along with the needle toward a fixed core due to a coil excitation,
- wherein
- a dent portion is provided at one end portion of the movable core opposing the fixed core in the axial direction, the dent portion extending apart from the fixed core, and
- a projection portion is provided at one end portion of the fixed core opposing the dent portion of the movable core in the axial direction, the projection portion having a shape corresponding to the shape of the dent portion.
6 more elements
Dependencies are inferred from the claim text.