jet pump

DE102017208279B4Active Publication Date: 2025-11-27ROBERT BOSCH GMBH
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Patent Information

Application Number
DE102017208279
Authority / Receiving Office
DE · DE
Patent Type
Patents
Current Assignee / Owner
Filing Date
2017-05-17
Publication Date
2025-11-27
Estimated Expiration
2037-05-17

AI Technical Summary

Technical Problem

Existing jet pumps in fuel cell systems face challenges in efficiently controlling the flow velocity of recirculated gases while maintaining a compact size and ensuring continuous operation, particularly during partial load conditions.

Method used

A jet pump design featuring a movable armature part within a housing, actuated by a magnetic coil, which adjusts the annular gap height to vary the flow velocity of a secondary gas medium, thereby controlling the flow of a first gaseous medium, such as recirculated hydrogen, by varying the gap height through axial displacement.

Benefits of technology

The design allows for efficient control of flow velocity and minimizes installation space, ensuring continuous operation with a defined minimum flow even in power failures, enhancing efficiency and flow control without increasing the pump's size.

✦ Generated by Eureka AI based on patent content.

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Abstract

Jet pump (10) for conveying a first gaseous medium (26) of a fuel cell system, comprising a housing (11) and an armature part (12) movable relative to it, wherein the armature part (12) forms an annular gap (28) in the flow path (27) of a second gaseous medium (32) with a stop sleeve (60), the gap height (36, 38) of which is variable, characterized in that the armature part (12), which limits the annular gap (28), has at least one opening (50, 52) which is passed through by the first gaseous medium (26).
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Citation Information

Patent Citations

  • improved construction of a jet pump

    DE102004002021A1

  • Electromagnetic control valve for ventilating fuel tank of motor vehicle internal combustion engine, has annular sealing toric ring that is inserted into valve seat and is attached on support body

    DE102004021290A1

  • Anode circuit for a fuel cell

    DE102012007384A1

  • Fuel cell system jet pumps and a fuel cell system

    DE102015216457A1

  • fuel cell device

    DE102016215027A1