# US 2022/0037686 A1 · Conveying unit for a fuel cell system for conveying and/or controlling a gaseous medium > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2022/0037686 A1 - Document ID: US20220037686A1 - Status: Published application - Kind: A1 - Application number: 17/279,892 - Filed: 2019-08-06 - Published: 2022-02-03 - Earliest claimed: 2018-09-25 - Assignees: Robert Bosch GmbH - Applicants: Robert Bosch GmbH - Inventors: Andreas Gruenberger; Armin Richter; Hans-Christoph Magel - Web page: https://patentgrep.com/patent/US20220037686A1 ## CPC - F04F 5/461: {Adjustable nozzles} - H01M 8/04097: {with recycling of the reactants (H01M8/04119, H01M8/04104 take precedence)} - F04F 5/16: displacing elastic fluids - F04F 5/44: Component parts, details, or accessories not provided for in, or of interest apart from, groups F04F5/02 - F04F5/42 - F04F 5/54: Installations characterised by use of jet pumps, e.g. combinations of two or more jet pumps of different type - H01M 8/04201: {Reactant storage and supply, e.g. means for feeding, pipes} - Y02E 60/50: Fuel cells - F04F: PUMPING OF FLUID BY DIRECT CONTACT OF ANOTHER FLUID OR BY USING INERTIA OF FLUID TO BE PUMPED {(evacuating by sorption F04B)}; SIPHONS {(conveying materials in bulk by flows of gas, liquid of foam B65G53/00)} - H01M: PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY - Y02E: REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION ## Abstract A conveying unit (1) for a fuel cell system (31) for conveying and/or recirculating a gaseous medium, in particular hydrogen, comprising a jet pump (4) driven by a driving jet of a pressurized gaseous medium, and comprising a metering valve (6) with a nozzle (12), wherein: the conveying unit (1) is designed as a combined valve jet pump assembly (2); the gaseous medium is fed to the jet pump (4) by means of the metering valve (6); the jet pump (4) has a main body (8); and the jet pump (4) is connected to an anode inlet (3) of a fuel cell (29). According to the invention, a deflection and/or change of direction of the gaseous medium which flows in a flow direction VII from the jet pump (4) to the anode input (3) of the fuel cell (29) occurs exclusively in the deflection region (22), said the jet pump (4) having a separate closure cover (5) connected to the main body (8), and the deflection region (22) and/or the deflection- or guiding geometry of the deflection region for the gaseous medium (22) is formed exclusively in the component of the closing cover (5). ## Claims ### Claim 1 A conveying unit (1) for a fuel cell system (31) for conveying and/or recirculating a gaseous medium, the conveying unit (1) having a jet pump (4) which is driven by a propellant jet of the pressurized gaseous medium and a metering valve (6) having a nozzle (12), wherein the conveying unit (1) is constructed as a combined valve/jet pump arrangement (2), wherein the gaseous medium of the jet pump (4) is supplied by the metering valve (6), wherein the jet pump (4) has a base member (8), wherein the jet pump (4) is connected to an anode input (3) of a fuel cell (29), characterized in that there is brought about a redirection and/or direction change of the gaseous medium flowing in a flow direction VII from the jet pump (4) to the anode input (3) of the fuel cell (29) exclusively in a redirection region (22), wherein the jet pump (4) has a separate closure lid (5) which is connected to the base member (8) and wherein the redirection region (22) and/or the redirection and guiding geometry of the redirection region (22) for the gaseous medium is constructed exclusively in the closure lid (5). ### Claim 2 (depends on 1) The conveying unit (1) as claimed in claim 1, characterized in that the closure lid (5) has a redirection nozzle (15), wherein the redirection nozzle (15) of the closure lid (5) in an installed state extends in the base member (8) in a direction of a longitudinal axis (30). ### Claim 3 (depends on 1) The conveying unit (1) as claimed in claim 1, characterized in that a connection piece (26) is located between the closure lid (5) and the anode input (3) of the fuel cell (29). ### Claim 4 (depends on 18) The conveying unit (1) as claimed in claim 18, characterized in that the recess (17) of the redirection nozzle (15) fluidly connects a diffusor region (20) and a connection piece (26) of the jet pump (4) at least indirectly to each other. ### Claim 5 (depends on 4) The conveying unit (1) as claimed in claim 4, characterized in that the recess (17) of the redirection nozzle (15) is formed to be open with respect to a flow cross-section of the diffusor region (20) and a flow cross-section of the connection piece (26) so that the gaseous medium can flow through the redirection nozzle (15) in the flow direction VII. ### Claim 6 (depends on 2) The conveying unit (1) as claimed in claim 2, characterized in that in the redirection region (22), a redirection and/or direction change of the gaseous medium is carried out almost at right-angles by the redirection nozzle (15). ### Claim 7 (depends on 18) The conveying unit (1) as claimed in claim 18, characterized in that the redirection nozzle (15) has in a region of the recess (17) in an inner flow cross-section thereof at least partially an at least substantially spherical inner space (19). ### Claim 8 (depends on 1) The conveying unit (1) as claimed in claim 1, characterized in that the closure lid (5) is connected to the base member (8) by a releasable connection so that the closure lid (5) can be disassembled from the base member (8). ### Claim 9 (depends on 1) The conveying unit (1) as claimed in claim 1, characterized in that the base member (8) and/or closure lid (5) is/are produced from a material or an alloy having a low specific thermal capacity. ### Claim 10 (depends on 2) The conveying unit (1) as claimed in claim 2, characterized in that the base member (8) and/or closure lid (5) of the jet pump (4) are produced from a metal material or a metal alloy. ### Claim 11 (depends on 1) The conveying unit (1) as claimed in claim 1, characterized in that the combined valve/jet pump arrangement (2) has a heating element (11). ### Claim 12 (depends on 1) The conveying unit (1) as claimed in claim 1, characterized in that cross-sectional surface-areas of the end portion of a diffusor region (20) of the jet pump (4), the redirection region (22), a connection piece (26) of the jet pump (4) and the anode input (3) which extend orthogonally with respect to the flow direction VII are at least substantially identical. ### Claim 13 (depends on 1) The conveying unit (1) as claimed in claim 1, characterized in that the metering valve (6) is configured as a proportional valve (6). ### Claim 14 (depends on 1) The conveying unit (1) as claimed in claim 1, characterized in that the nozzle (12) and a mixing pipe (18) of the jet pump (4) are configured in a rotationally symmetrical manner, wherein the nozzle (12) extends coaxially with respect to the mixing pipe (18) of the jet pump (4). ### Claim 15 (depends on 1) A fuel cell system (31) having a conveying unit (1) as claimed in claim 1. ### Claim 16 (depends on 1) The conveying unit (1) as claimed in claim 1, wherein the gaseous medium is hydrogen. ### Claim 17 (depends on 2) The conveying unit (1) as claimed in claim 2, wherein the redirection nozzle has a cylindrical outer shape. ### Claim 18 (depends on 2) The conveying unit (1) as claimed in claim 2, wherein the redirection nozzle (15) has a recess (17) in an inner shape thereof, wherein the recess (17) is configured to guide the flow of the gaseous medium. ### Claim 19 (depends on 8) The conveying unit (1) as claimed in claim 8, wherein the releasable connection is a screw connection.