Delivery device for gaseous media for delivery and / or recirculation for a fuel cell system

Abstract

The present invention relates to a delivery device (1) for a fuel cell system (31) for the delivery and / or recirculation of a gaseous medium, particularly hydrogen, the delivery device having a recirculation blower (8), an ejector pump (4) driven by a driving beam of a gaseous medium under pressure, and a metering valve (6), wherein the gaseous medium under pressure is supplied to the ejector pump (4) by means of the metering valve (6), wherein the ejector pump (4) has a suction region (18), a mixing tube (19), a diffusion region (20), and an end region (22), wherein the anode output of a fuel cell (29) is fluidly connected to the input of the delivery device (1), and the output of the delivery device (1) is fluidly connected to the anode input (5) of the fuel cell (29), wherein the ejector pump (4) and the metering valve (6) form a combined valve-ejector pump assembly (12). According to the invention, the valve-jet pump assembly (12) and the recirculation blower (8) of the conveying device (1) are arranged in parallel and / or interconnected in terms of flow technology.

Description

Technical Field

[0001] The present invention relates to a delivery device for a fuel cell system for the delivery and / or recycling of a gaseous medium, particularly hydrogen, said delivery device being particularly configured for use in a vehicle having a fuel cell drive. Background Technology

[0002] In the automotive industry, gaseous fuels will play an increasingly important role in addition to liquid fuels. This is especially true in fuel cell vehicles, where hydrogen flow control is crucial. Here, the gas flow is no longer controlled discontinuously as in liquid fuel injection; instead, it is drawn from at least one high-pressure tank and guided through the inlet lines of a medium-pressure pipeline system to a delivery device. This delivery device then guides the gas to the fuel cell via connecting lines in a low-pressure pipeline system.

[0003] A delivery device for a fuel cell system is known from DE 10 2017 222 390 A1, for the delivery and / or recirculation of a gaseous medium. The delivery device includes a recirculation blower and an ejector pump driven by a driving beam of the pressurized gaseous medium. The anode output of the fuel cell is at least indirectly fluidly connected to the input of the delivery device, and the output of the delivery device is fluidly connected to the anode input of the fuel cell. Here, the pressurized gaseous medium is supplied to the ejector pump via a metering valve, and the ejector pump and the metering valve form a combined valve-ejector pump assembly.

[0004] The delivery device known from DE 10 2017 222 390 A1 may have certain drawbacks. According to this invention, the components of the recirculation blower and the jet pump are fluidly connected to each other and to the fuel cell, such that these components are connected in series. Here, unconsumed gaseous medium flows at least indirectly from the fuel cell, particularly the anode region, through a return line. After the gaseous medium is compressed and flows through the recirculation blower, it further flows from the gas discharge opening of the recirculation blower to the first inlet of the jet pump and / or the combined valve-jet pump assembly. Due to this series arrangement of the components—the recirculation blower and the valve-jet pump assembly of the delivery device—and thus their sequential arrangement in terms of flow technology, they must be designed to be relatively large in order to achieve and provide the required volumetric flow in the fuel cell. Moreover, when the recirculation blower is shut off, at certain load points and / or operating points of the fuel cell, the gaseous medium must still flow completely through the recirculation blower in order to reach the jet pump, where the recirculation blower creates flow resistance in the off state. Summary of the Invention

[0005] According to the present invention, a delivery device for a fuel cell system is provided for the delivery and / or recirculation of a gaseous medium, particularly hydrogen, hereinafter referred to as H2. The delivery device includes a recirculation blower and an ejector pump with a metering valve, driven by a driving beam of the pressurized gaseous medium. The pressurized gaseous medium is supplied to the ejector pump via the metering valve, wherein the ejector pump has a suction region, a mixing tube, a diffusion region, and an end region. The anode output of the fuel cell is fluidly connected to the input of the delivery device, wherein the output of the delivery device is fluidly connected to the anode input of the fuel cell, and wherein the ejector pump and the metering valve form a combined valve-ejector pump assembly.

[0006] According to claim 1, the delivery device is configured such that the valve-injector pump assembly and the recirculation blower fluid of the delivery device are arranged in parallel and / or interconnected. An advantage obtained in this manner is that the volumetric flows of the recirculation blower and the combined valve-injector pump assembly are superimposed and therefore at least almost mutually reinforcing. Therefore, the components of the recirculation blower and the combined valve-injector pump assembly can be designed to be smaller and / or sized to produce the same volumetric flow as in a series arrangement and thus sequential arrangement. In this way, the structural space for the entire delivery device can be reduced, particularly for components in fuel cell systems and / or the recirculation blower and / or the combined valve-injector pump assembly and / or the injection pump and / or the metering valve in the vehicle. Furthermore, the manufacturing and / or assembly costs of the recirculation blower and / or the combined valve-injector pump assembly and / or the injection pump and / or the metering valve can be reduced. Moreover, smaller components, especially the recirculation blower and the metering valve, require less energy, especially electrical energy, during operation, for example, due to the smaller mass of the moving parts, thereby reducing the operating costs of the delivery device.

[0007] Advantageous improvements to the conveying device described in claim 1 can be achieved through the measures listed in the dependent claims. The dependent claims relate to preferred improvements of the invention.

[0008] According to an advantageous configuration of the delivery device, the node is located upstream of the valve-ejector pump assembly and the recirculation blower. At this node, the flow lines, especially the return lines, branch in flow technique, wherein the gaseous medium flows from the node to the recirculation blower via a first connecting line and to the valve-ejector pump assembly via a second connecting line. In this way, the flow of unconsumed medium from the fuel cell, especially the recirculated medium, can be branched, allowing the gaseous medium to be advantageously fed and / or supplied to the component recirculation blower and valve-ejector pump assembly. In another advantageous exemplary embodiment of the delivery device, the node can be electronically, mechanically, or otherwise manipulated to achieve controllable distribution of the volumetric flow of the gaseous medium, such that more of the delivery is directed to the recirculation blower and less to the valve-ejector pump assembly, and vice versa, depending on the operating state of the fuel cell system and the corresponding optimal load point of the components. A first exemplary division of the volumetric flow is as follows: 100% of the volumetric flow is directed to the recirculation blower via the gaseous medium node, and 0% of the volumetric flow is directed to the valve-jet pump assembly. A second exemplary division of the volumetric flow via the node is as follows: 0% of the gaseous medium volumetric flow is directed to the recirculation blower, and 100% of the gaseous medium volumetric flow is directed to the valve-jet pump assembly. Furthermore, all distribution scenarios can be formed between them, for example, 30% of the volumetric flow is directed to the recirculation blower via the gaseous medium node, and 70% of the volumetric flow is directed to the valve-jet pump assembly. This can be achieved, for example, by means of at least one valve, thereby completely avoiding the flow resistance of that component, for example, in the event of component failure. In this way, the efficiency of the delivery device and / or the entire fuel cell system can be improved, and operating costs can be reduced. Furthermore, if one of the recirculation blower or the combined valve-jet pump assembly fails, the fuel cell system can continue to operate more efficiently due to the parallel arrangement. Furthermore, by feeding the components accordingly, the fuel cell system can always operate at the optimal operating point, thereby improving efficiency over a large bandwidth of operating conditions.

[0009] According to an advantageous improvement of the delivery device, a first flow channel is located downstream of the valve-injector pump assembly, and a second flow channel is located downstream of the recirculation blower, wherein these two flow channels constitute an integrated flow channel complex. This allows for space-saving arrangements of the recirculation blower and valve-injector pump assembly in terms of their downstream location and / or generally in terms of their placement within the vehicle. In this way, the structural space required for the delivery device in the fuel cell system can be reduced, particularly when the delivery device is mounted on the fuel cell, wherein its components are positioned on a plate-like carrier element, and / or the required structural space throughout the vehicle can be reduced.

[0010] In addition, it can save on parts and / or materials costs.

[0011] According to a particularly advantageous configuration of the conveying device, a combined third flow channel is located downstream of the respective flow channels and / or the integrated flow channel complex, in which the first and second flow channels converge. In this way, the corresponding preceding, especially at least nearly parallel, first and second flow channels can achieve optimal convergence in terms of flow technology. Here, when the two flow channels converge, friction due to eddies and / or friction between the medium and the walls of the respective flow channels is minimized, thereby improving the efficiency of the recirculation blower and / or valve-jet pump assembly and / or the conveying device and / or the fuel cell system. Furthermore, due to this configuration of the conveying device according to the invention, which has an integrated flow channel, particularly in the form of a third flow channel synthesized from the first and second flow channels, backflow of the gaseous medium into the recirculation blower and / or valve-jet pump assembly can be prevented.

[0012] According to an advantageous configuration, the first and second flow channels are fluidly separated by a second wall, particularly before the flow channels further transition downstream into the combined third flow channel. In this way, mixing of the respective flows from the recirculation blower and the flow from the valve-jet pump assembly can be prevented in the region of the integrated flow channel complex, where these flows can, in particular, have different velocities and / or different pressure levels and / or different compositions. This, on the one hand, prevents the gaseous medium from flowing back into the recirculation blower and / or the valve-jet pump assembly, and / or can improve the efficiency of the conveying device. Furthermore, a compact structure of the conveying device can be achieved in the region of the flow channel complex.

[0013] According to a particularly advantageous configuration of the delivery device, a first flow channel has a first height, and a second flow channel has a second height. Here, the two flow channels have at least nearly the same width, wherein the width is greater than the corresponding height, and particularly greater than the corresponding height by at least a factor of 2. In this way, a compact structural form can be achieved for the respective flow channels and / or the integrated flow channel complex. Furthermore, this configuration of the delivery device offers advantages when the flow channels, as part of the delivery device, are arranged on a plate-like carrier element between the delivery device and the fuel cell. Moreover, this configuration of the first and second flow channels provides advantages when it is necessary to achieve a reversal of the flow of the gaseous medium, especially a near-right-angle reversal, so that the gaseous medium must flow from the output end of the delivery device into the anode input end of the fuel cell. Therefore, the efficiency of the fuel cell system can be improved.

[0014] According to an advantageous improvement of the delivery device, the second height of the second flow channel is greater than the first height of the first flow channel. This allows for better merging of the two gaseous media from the first and second flow channels in the region of the combined third flow channel. This is because, under most operating conditions of the fuel cell system, the second flow channel from the recirculation blower delivers a larger volumetric flow than the first flow channel from the valve-jet pump assembly, especially since the recirculation blower has a higher volumetric power output than the valve-jet pump assembly. Therefore, this method improves the efficiency of the delivery device in at least almost all operating conditions of the fuel cell system. Furthermore, this method prevents the gaseous media from flowing back into the valve-jet pump assembly.

[0015] According to an advantageous configuration, the jet pump has an axis of symmetry, wherein a first flow channel has a first longitudinal axis and a second flow channel has a second longitudinal axis, wherein the respective longitudinal axes extend at an angle α to the axis of symmetry, and wherein these longitudinal axes extend at least almost parallel to each other. Here, the angle α can be in the range of 0.5° to 90°. In this way, backflow of gaseous medium into the valve-jet pump assembly can be avoided, and the delivery device can have a compact structural form, especially in terms of the orientation of the component recirculation blower and the valve-jet pump assembly and their surrounding components and / or accessories relative to each other.

[0016] According to a particularly advantageous improvement, the conveying device has additional flow direction deflections in the regions of the integrated flow channel complex and / or the combined third flow channel, particularly in the regions of the respective longitudinal axes or the combined longitudinal axes, wherein these deflections are constructed, for example, at almost right angles. Furthermore, the flow technology provides the advantage that the confluence in the regions of the combined flow channels has the largest possible deflection, particularly at least at almost right angles, thereby achieving high deflection losses from the existing flow from one first inflow channel to another second inflow channel. In this way, backflow can be prevented in the individual flow channels, particularly in the first flow channel of the valve-jet pump assembly. Additional backflow prevention components, such as check valves, are no longer necessary in the regions of the integrated flow channel complex and / or the combined third flow channel, thereby reducing product costs, but also preventing the probability of failure of such components, for example, damage from frozen water due to prolonged use at low temperatures. Therefore, the service life of the conveying device can be increased and / or the total cost of the conveying device can be reduced.

[0017] According to an advantageous configuration, the width of the corresponding flow channel is greater than the corresponding height by a factor of 2 to 200. This allows for a low-cost configuration of the conveying device, where backflow of the gaseous medium through the corresponding flow channel is prevented. Furthermore, it reduces the required structural space of the conveying device. Attached Figure Description

[0018] The present invention will now be described in detail with reference to the accompanying drawings.

[0019] The attached diagram shows:

[0020] Figure 1 A top view of the conveying device, which includes a valve-jet pump assembly, a recirculation blower, and first, second, and combined third flow channels.

[0021] Figure 2 shows a schematic cross-sectional view AA of the integrated flow channel complex.

[0022] Figure 3 A schematic diagram of a fuel cell system having a fuel cell and a delivery device according to the present invention. Detailed Implementation

[0023] Figure 1 The conveying device 1 is shown, which includes a component valve-jet pump assembly 12, a recirculation blower 8, and a first flow channel 15, a second flow channel 17, and a combined third flow channel 39. Here, the valve-jet pump assembly 12 includes a component jet pump 4 and a metering valve 6. The first flow channel 15 and the second flow channel 17 here constitute an integrated flow channel complex 25.

[0024] Here, the conveying device 1 is in Figure 1 The components shown in the figure can be fixed to and / or fixed to the fuel cell 29 via a plate-like carrier element in an exemplary embodiment. Here, the delivery device 1 is used for the delivery and / or recirculation of the gaseous medium, especially H2. Furthermore, the ejector pump 4 is driven by a pressurized gaseous medium, wherein the pressurized gaseous medium (especially the driving medium) is supplied to the ejector pump 4 by means of a metering valve 6, wherein the metering valve 6 is at least partially integrated into the ejector pump 4. Here, the metering valve 6 is inserted into the ejector pump 4, particularly along the direction of the axis of symmetry 13. The combined valve-ejector pump assembly 12 also has a first inlet 28, a second inlet 36, a suction region 18, a mixing tube 19, a diffusion region 20, and a supply section 22. The gaseous medium, especially the recirculated medium, flows from the output of the fuel cell 29 into the ejector pump 4, especially the suction region 18, through the first inlet 28 via at least one second flow connection 5. The gaseous medium flows through the fuel cell 29 (in Figure 3(As shown in the diagram) it then flows back through the valve-injector pump assembly 12. In addition, the driving medium is supplied to the valve-injector pump assembly 12, wherein the driving medium is supplied from the tank 34, in particular the high-pressure tank of the fuel cell system 31, via the inlet line 21.

[0025] In addition, Figure 1 As shown, the recirculation blower 8 and the valve-jet pump assembly 12, especially the jet pump 4, are only indirectly fluidly connected to each other, particularly only indirectly through a combined third flow channel 39. Due to this embodiment of the conveying device 1 and / or the embodiment and arrangement of the flow channels 15, 17, 39, the backflow of the gaseous medium conveyed by the recirculation blower 8 into the valve-jet pump assembly 12 can be prevented.

[0026] exist Figure 1 The diagram also shows that the recirculation blower 8 has a gas inlet opening 33, which can be implemented in particular as a first cylindrical recess in the housing 24 of the recirculation blower 8, the first cylindrical recess being connected to (in) via a first connecting pipe 3. Figure 3 (As shown in the diagram) Node 10 is connected. Here, the first connecting pipe 3 can extend into the first cylindrical recess of the recirculation blower 8, wherein a seal is achieved by a first sealing ring 14, wherein the first sealing ring 14 is made of an elastic material, such as an O-ring. Furthermore, the recirculation blower 8 has a gas discharge opening 35 in its housing 24, which can be implemented as a second cylindrical recess, through which the recirculation blower 8 is connected to the fuel cell 29, particularly the anode region 38, via at least a second flow channel 17 and a third flow channel 39. Here, the second flow channel 17 can extend into the second cylindrical recess of the recirculation blower 8, wherein a seal is achieved by a second sealing ring 16, wherein the second sealing ring 16 is made of an elastic material, such as an O-ring. The gaseous medium conveyed and / or compressed in the recirculation blower 8 flows from the recirculation blower 8 to the fuel cell 29 through at least the second flow channel 17 in the flow direction VII. The jet pump 4 and / or valve-jet pump assembly 12 are flowed by the gaseous medium along the flow direction VI and have an axis of symmetry 13, wherein the flow direction VI extends parallel to the axis of symmetry 13.

[0027] In addition, Figure 1As shown, on the one hand, the input end of the delivery device 1 is fluidly connected to the anode output end of the fuel cell 29, and on the other hand, the anode input end of the fuel cell is fluidly connected to the output end of the delivery device 1. A gaseous medium (especially a recirculation medium) flows from the fuel cell 29 through an exemplary flow path of the delivery device 1, or through a path via the valve-jet pump assembly 12, or through a second path via the recirculation blower 8, wherein these two paths are arranged in parallel.

[0028] Here, the gaseous medium flows through the region suction zone 18, mixing pipe 19, diffusion zone 20, and supply section 22 in the flow direction VI in the following order. A so-called jet pump effect occurs within the jet pump 4 and / or the valve-jet pump assembly 12. For this purpose, the gaseous driving medium, especially H2, flows from outside the valve-jet pump assembly 12, especially from the high-pressure tank, into the metering valve 6 through the second inlet 36. Furthermore, unconsumed recirculated medium from the fuel cell 29 (which is H2 and, if necessary, other components such as H2O and / or N2) is delivered to the suction zone 18 of the jet pump 4 through the second flow line 5 and the first inlet 28. Now, the working medium is introduced into the suction zone 18 by opening the metering valve 6, especially under high pressure. Here, the gaseous driving medium flows in the direction of flow VI. H2, used as the driving medium, flows into the suction region 18 from the second inlet 36 and has a velocity and / or pressure difference relative to the recirculation medium, which flows into the suction region 18 from the first inlet 28. To generate the jet pump effect, the recirculation medium is delivered to the suction region 18 of the jet pump 4 at a low pressure and / or small mass flow rate. Here, the driving medium flows into the suction region 18 through the metering valve 6 at the described pressure difference and / or, in particular, a high velocity close to the speed of sound. Here, the driving medium encounters the recirculation medium already in the suction region 18. Due to the high velocity and / or pressure difference between the driving medium and the recirculation medium, internal friction and turbulence are generated between these media. Here, shear stress is generated in the boundary layer between the fast-moving driving medium and the significantly slower recirculation medium. This stress causes momentum transfer, in which the recirculation medium is accelerated and carried away. Mixing occurs according to the principle of momentum conservation. Here, the recirculation medium is accelerated in the flow direction VI and a pressure drop is also generated for the recirculation medium, thereby using a suction action and thus replenishing the recirculation medium from the area of ​​the first inlet 28 and / or the second flow line 5. The delivery rate of the recirculation medium can be adjusted by changing and / or regulating the opening duration and frequency of the metering valve 6, depending on the operating conditions and requirements of the entire fuel cell system 31 (in... Figure 1 Not shown in the image, see [link / reference]. Figure 3 It matches the corresponding needs.

[0029] After a flow reversal has occurred, particularly at an angle α in the supply section 22, the gaseous medium flows further from the valve-jet pump assembly 12 into the combined third flow channel 39 through the first flow channel 15 of the integrated flow channel complex 25. In this third flow channel, the gaseous medium from the valve-jet pump assembly 12 mixes with the gaseous medium from the recirculation blower 8. Here, the second wall 37 of the supply section 22 causes a reversal in the flow direction of the gaseous medium because the second wall extends at an angle α to the flow direction VI, and the gaseous medium impacts the second wall 37 and is then deflected by it.

[0030] In addition, Figure 1 As shown, the jet pump 4 has an axis of symmetry 13, the first flow channel 15 has a first longitudinal axis 41, and the second flow channel 17 has a second longitudinal axis 43, wherein the corresponding longitudinal axes 41 and 43 extend at an angle α to the axis of symmetry 13, and wherein the longitudinal axes 41 and 43 extend at least almost parallel to each other. Here, the valve-jet pump assembly 12 and the recirculation blower 8 of the conveying device 1 are arranged in parallel and / or interconnected in terms of flow technology. Here, the first flow channel 15 is located downstream of the valve-jet pump assembly 12 or the jet pump 4, and the second flow channel 17 is located downstream of the recirculation blower 8, wherein these two flow channels 15 and 17 constitute an integrated flow channel complex 25. Furthermore, a combined third flow channel 39 is shown located downstream of the corresponding flow channels 15 and 17 and / or the integrated flow channel complex 25, in which the first flow channel 15 and the second flow channel 17 converge in terms of flow technology. Here, in the region of the integrated flow channel complex 25, the following effect is achieved in terms of flow technology: the two flows of the gaseous medium flow in the same direction with at least almost the same vector.

[0031] When the recirculation blower 8 is interconnected and / or mutually connected with the integrated valve-ejector pump assembly 12, especially the ejector pump 4, in parallel, the volumetric flows of the two components 8, 12 can be advantageously superimposed, thereby allowing the components 8, 12 to be designed to be smaller. However, a potential problem here is that the integrated valve-ejector pump assembly 12 may not establish sufficient pressure at low load points and / or operating points of the fuel cell system 31, especially to maintain the pressure in the first flow channel 15 to prevent the delivery of the recirculation blower 8 from the combined third flow channel 39 back to the ejector pump 4 through the first flow channel 15. Here, the recirculation of the recirculation medium in the valve-ejector pump assembly 12 is completely interrupted by the driving medium. To prevent this, the delivery device 1 can be used in a manner that does not... Figure 1Another exemplary embodiment is shown, in which additional deflection portions of the flow direction are provided in the region of the integrated flow channel complex 25 and / or the composite third flow channel 39, which are achieved by the structural shaping of the flow channels 15, 17, 39. This applies, for example, to the region of the corresponding longitudinal axes 41, 43 or the region of the composite third longitudinal axis, wherein the deflection portion is constructed, for example, almost at a right angle. However, such deflection portions can also be implemented orthogonally to the corresponding longitudinal axes 41, 43, particularly toward the anode input end of the fuel cell 29.

[0032] Furthermore, it is advantageous that, for example, the components of the conveyor 1 are arranged on plate-shaped carrier elements, thereby enabling simple positioning of the components relative to each other, since these components must be individually connected to the plate-shaped carrier elements. This reduces the number of components required for assembly, which in turn leads to cost savings for the conveyor 1. In addition, the probability of assembly errors caused by misaligned components of the conveyor 1 is reduced, which in turn reduces the probability of failure of the conveyor 1 during operation.

[0033] Figure 2 shows a schematic cross-sectional view AA of the integrated flow channel complex 25, opposite to the flow direction VII. Here, the first flow channel 15 and the second flow channel 17 are fluidly separated by a first wall 26. This first wall 26 separates the two flow channels 15, 17 until they further transition downstream into the synthesized third flow channel 39. Here, the first flow channel 15 has a first height 7 and the second flow channel 17 has a second height 9, wherein, in an exemplary embodiment of the flow channel complex 25, the second height 9 of the second flow channel 17 is greater than the first height 7 of the first flow channel 15. Furthermore, the two flow channels 15, 17 have at least nearly identical widths 11, wherein the width 11 is greater than the corresponding heights 7, 9, especially by at least a factor of 2. Here, the width 11 can be greater than the corresponding heights 7, 9 by a factor of 2 to 200, or greater than the sum of the first height 7 and the second height 9.

[0034] Figure 3A schematic diagram illustrates an exemplary embodiment of a fuel cell system 31 according to the invention, comprising a fuel cell 29 and a delivery device 1. Particularly shown are the components on the anode side and their arrangement relative to each other. The delivery device 1 includes a node 10, a first connecting line 3, a second connecting line 5, a recirculation blower 8, a valve-jet pump assembly 12, an integrated flow channel complex 25, and a combined third flow channel 39. The delivery device 1 is connected to the fuel cell 29 via the combined third flow channel 39, which includes an anode region 38 and a cathode region 40. Here, a gaseous medium flows along the flow direction VIII from the integrated flow channel complex 25 through the combined third flow channel 39 to the anode region 38 of the fuel cell 29.

[0035] Furthermore, it is shown that unconsumed gaseous medium (which is particularly referred to as recirculation medium) flows back to the conveying device 1 via return line 23 in the flow direction VIII. Upon arrival there, the gaseous medium encounters node 10. This node 10 is located upstream of the valve-jet pump assembly 12 and the recirculation blower 8, wherein the return line 23 fluidly branches at node 10, wherein on one hand the gaseous medium flows from node 10 to the recirculation blower 8 via the first connecting line 3, and on the other hand the remaining portion of the gaseous medium flows from node 10 to the valve-jet pump assembly 12 via the second connecting line 5, wherein the gaseous medium, especially the recirculation medium, flows into the jet pump 4 of the valve-jet pump assembly 12 via the first inlet 28.

[0036] As by Figure 3 Furthermore, it can be seen that the second gaseous medium stored in tank 34, in particular at least almost 700 bar, is supplied via inlet pipe 21 to the inflow area of ​​the conveying device 1, in particular the metering valve 6, which is specifically configured as a second inlet 36. This second gaseous medium is in particular a driving medium.

Claims

1. A delivery device (1) for a fuel cell system (31) for delivering and / or recirculating a gaseous medium, said delivery device comprising a recirculation blower (8), a jet pump (4) driven by a driving beam of the gaseous medium under pressure, and a metering valve (6), wherein, A pressurized gaseous medium is supplied to the jet pump (4) via the metering valve (6), wherein the jet pump (4) has a suction region (18), a mixing pipe (19), a diffusion region (20), and an end region, wherein the anode output of the fuel cell (29) is fluidly connected to the input of the delivery device (1), and the output of the delivery device (1) is fluidly connected to the anode input of the fuel cell (29), wherein the jet pump (4) and the metering valve (6) form a combined valve-jet pump assembly (12), wherein the valve-jet pump assembly (12) and the recirculation blower (8) of the delivery device (1) are arranged in parallel and / or interconnected in flow technology. The first flow channel (15) is located downstream of the valve-jet pump assembly (12), and the second flow channel (17) is located downstream of the recirculation blower (8). These two flow channels (15, 17) constitute an integrated flow channel complex (25).

2. The conveying device (1) according to claim 1, characterized in that, Node (10) is located upstream of the valve-jet pump assembly (12) and the recirculation blower (8), at which the flow path branches in a flow technique, wherein the gaseous medium flows from the node (10) to the recirculation blower (8) via a first connecting line (3) and from the node (10) to the valve-jet pump assembly (12) via a second connecting line (5).

3. The conveying device (1) according to claim 1, characterized in that, The synthesized third flow channel (39) is located downstream of the corresponding flow channels (15, 17) and / or the integrated flow channel complex (25), in which the first flow channel (15) and the second flow channel (17) converge in flow technology.

4. The conveying device (1) according to claim 1, characterized in that, The first flow channel (15) and the second flow channel (17) are fluid separated by the first wall (26).

5. The conveying device (1) according to claim 3 or 4, characterized in that, The first flow channel (15) has a first height (7) and the second flow channel (17) has a second height (9), wherein the two flow channels (15, 17) have at least nearly the same width (11), wherein the width (11) is greater than the corresponding height (7, 9).

6. The conveying device (1) according to claim 5, characterized in that, The second height (9) of the second flow channel (17) is greater than the first height (7) of the first flow channel (15).

7. The conveying device (1) according to any one of claims 1 to 4, characterized in that, The jet pump (4) has an axis of symmetry (13), the first flow channel (15) has a first longitudinal axis (41), and the second flow channel (17) has a second longitudinal axis (43), wherein the corresponding longitudinal axes (41, 43) extend at an angle α to the axis of symmetry (13), and wherein the longitudinal axes (41, 43) extend at least almost parallel to each other.

8. The conveying device (1) according to any one of claims 1 to 3, characterized in that, The conveying device (1) has an additional deflector in the flow direction in the region of the integrated flow channel complex (25).

9. The conveying device (1) according to claim 5, characterized in that, The width (11) of the corresponding flow channels (15, 17) is greater than the corresponding height (7, 9) by a factor of 2 to 200.

10. The conveying device (1) according to claim 1, characterized in that, The gaseous medium is hydrogen.

11. The conveying device (1) according to claim 2, characterized in that, The flow pipeline is a return pipeline (23).

12. The conveying device (1) according to claim 3, characterized in that, The first flow channel (15) and the second flow channel (17) are further downstream of the flow channels (15, 17) into the synthesized third flow channel (39).

13. The conveying device (1) according to claim 5, characterized in that, The width (11) is greater than the corresponding height by at least a factor of 2.

14. The conveying device (1) according to claim 3, characterized in that, The conveying device (1) has an additional deflector in the flow direction in the region of the combined third flow channel (39).

15. The conveying device (1) according to claim 8, characterized in that, The conveying device (1) has an additional deflector in the flow direction in the region of the corresponding longitudinal axis (41, 43) or in the region of the combined longitudinal axis.

16. The conveying device (1) according to claim 8, characterized in that, The steering unit is constructed at almost a right angle.

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