JP6937848B2 - Sending unit - Google Patents

Description

The present invention relates to a delivery unit for a fuel cell structure and how to use it.

From Patent Document 1, a multi-stage ejector for a fuel cell system including at least one ejector body for providing hydrogen is known, and a plurality of ejector bodies arranged so as to be positioned one after the other. A preset vacant space is left, including the nozzle, and the diameter of the vacant space at the corresponding nozzle increases when viewed from the intake side of the ejector body to its outer side. Further, a plurality of sub-capture portions connected to one space or a plurality of spaces between the individual nozzles are formed on the outer surface of the ejector body. The ejector body is housed in a housing and contains a main intake for containing recirculated hydrogen. This multi-stage ejector improves system performance by increasing the amount of recirculated hydrogen. Further, at least one safety valve is provided at the ejector intake position in order to finally prevent the reflux of the recirculated hydrogen gas. At least one heating device extending around the ejector is provided to improve the cold start capability.

Patent Document 2 relates to an ejector for a fuel cell. This ejector is used in a fuel cell and includes an ejector body having an intake connection, a discharge connection, a suction connection, and a connection for a gas to oxidize. Further, three chambers are provided in the main body, and a nozzle having a nozzle hole through which the driving gas flows out is provided, and further, the driving gas supplied through the nozzle and the gas discharged from the fuel cell are mixed. A diffuser is provided to supply the suction connection. Further, a needle-like component extending axially along the nozzle and into a hollow space provided therein is housed on one side of the body. First and second diaphragms facing each other are arranged.

U.S. Pat. No. 7,687,171 B2 U.S. Pat. No. 8,999,593B2

According to the present invention, a delivery unit for a fuel cell system has been proposed, the delivery unit having a nozzle and a diffuser, the diffuser being axially adjustable through an adjusting member located inside the delivery unit. Diffuser, at the same time as opening or closing the first H ₂ inlet, adjusting the fabricated annular gap gap width between the nozzles arranged stationary in a position adjustable diffuser and delivery unit in the axial direction It is preferable that they are arranged in such a manner. Thereby, an annular gap driving gas flows out of the first H ₂ inlet, a change of the cross section ratio between the flow cross-section for recycle to be delivered by the delivery unit proposed by the present invention performed, the control of the H ₂ recycle with it are performed as required. The cross-section ratio A _Rezirkulat / A _Ringspart can be varied over a wide range between 8 and 50. The smaller the flow cross section in the first H ₂ inflow section is adjusted, the higher the discharge rate of the drive gas medium flowing through _{the first H 2 supply section is generated.} Higher discharge speed of the drive gas medium discharged from the first H ₂ inlet is increased, it is possible to set the more of delivery by the delivery unit proposed by the present invention.

According to the solution proposed in the present invention, the diffuser is housed in a bearing location that includes an adjusting member. It is preferable that the adjusting member is manufactured as an electromagnet. The electrical connection of the electromagnet that energizes the electromagnet is derived from the delivery unit.

An annular gap is formed between the nozzle stationaryly housed in the delivery unit and the diffuser whose position can be adjusted in the axial direction. _{A first H 2} inflow portion communicates with this annular gap, and as a gaseous driving medium for another gaseous medium to be sent out through the first H 2 inflow portion, in this example, particularly serves as an _{H 2 recirculation.} Hydrogen that fulfills the inflow.

The annular gap between the nozzle stationary in the delivery unit and the axially adjustable diffuser is separated by the diffuser surface on the one hand and by the nozzle surface on the other. The diffuser is axially adjustable relative to the nozzles stationary in the delivery unit, thereby changing the annular clearance width of the annular gap between the nozzle surface and the diffuser surface. ..

In another embodiment of the solution proposed by the present invention, the diffuser, which can be actively positioned axially, is axially initially stressed by a spring. When at rest, the spring, the diffuser pushes the diffuser in a direction towards the seat to close both the first H ₂ inlet. The spring that urges the diffuser is itself supported by a press-fitting portion that is press-fitted into the pole of the delivery unit. The spring stroke and the initial stress at which the spring urges the diffuser to the resting position can be adjusted according to the axial position of the press-fit ring press-fitted into the pole. Diffuser, when in the state in which the adjusting member is not operated, to close the first H ₂ inlet by configured sealing member, for example, as an elastomer seal ring, etc.. In particular, when configured adjustment member as an electromagnet is operated, the diffuser is adjusted position against the prestress of the spring axially acting contrary, the first H ₂ inlet is released by it, On the other hand, at the same time, the gap width of the annular gap is adjusted. The position adjusting stroke of the electromagnet structure is between 0 μm and 1000 μm in the axial direction, preferably between 0 μm and 500 μm, and particularly preferably between 0 μm and 300 μm. Depending on the energization of the operating member, when _{the second} inflow portion first H is opened, it is possible to change the gap width of the annular gap between the nozzle face and the diffuser surface. Along with this, gaseous H ₂ can affect the flow velocity discharged from the annular gap, thus _{affecting H 2} recirculation.

One preferred availability of the delivery unit proposed by the present invention lies in its use in fuel cell systems.

An advantage obtained with the solution of the present invention is that the delivery unit proposed by the present invention allows the active position adjustment of the diffuser to be performed through the adjustment unit inside the delivery unit. In this way, _{the flow velocity of H 2 discharged from the first H 2} inflow section, which serves as a gaseous drive medium, can be affected, and accordingly, the H ₂ regeneration in the fuel cell system. The circulation can be controlled as needed. By changing the flow cross-section of _{A Rezirkulat} / A _Ringspalt, in particular remains constant flow cross-section for recycle which is a _{H 2,} to enlarge or reduce the outlet opening of the annular gap to the middle of the flow path The flow velocity of the gaseous driving gas discharged from the first H ₂ inflow section, that is, H ₂ in the central flow cross section, is adjusted to decrease or increase. In order to realize the compact design form of the delivery unit proposed by the present invention, it is particularly preferable that the adjusting member configured as an electromagnet is incorporated in the bearing portion for the diffuser. The electrical connection, or coil connection, is guided outward on both sides of the delivery unit through the housing, the lid, and the holes in the poles. The individual components of the delivery unit, namely the poles, the nozzles, and the bearing locations formed in the nozzles for the axially adjustable diffuser may be screwed together, for example in the longitudinal direction. Instead of screwing the components, they may be pinned or otherwise friction-bonded together, thereby leaving them disassembled for maintenance or repair purposes.

Next, the present invention will be described in detail with reference to the drawings.

It is an embodiment of the delivery unit of the present invention having a diffuser whose position can be adjusted in the axial direction.

In the drawing of FIG. 1, one embodiment of a delivery unit according to the present invention having a diffuser whose position can be adjusted in the axial direction can be seen.

In the drawing of FIG. 1, a vertical cross-sectional view of the delivery unit 8 proposed based on the present invention, which is configured to be rotationally symmetric with respect to the axis of symmetry, can be seen. The delivery unit includes a pole 10 and a nozzle 12 stationaryly supported by the delivery unit 8. The magnetic separator is represented by reference numeral 14. The delivery unit 8 includes a diffuser 16 operated by an adjusting member 18, which is made substantially annularly, in particular as a magnetic coil. The adjusting member 18 in the form of a magnetic coil is housed inside a bearing portion 20 for the diffuser 16 configured in an annular shape.
As is clear from the drawing of FIG. 1, the diffuser 16 configured to be substantially annular is axially urged by the spring 24. The spring 24 is supported by the press-fit ring 22. The press-fit ring 22 is press-fitted into the pole 10. The press-fit ring 22 is assembled to the inner mantle surface of the pole 10 according to the desired initial stress to be applied to the diffuser 16 by the spring 24. When the adjusting member 18 is in the resting position, the spring 24 supported by the press-fit ring 22 presses the diffuser toward the nozzle 12. An elastomer sealant 26 preferably formed in an annular shape may be arranged on the sheet formed between the nozzle 12 and the diffuser 16. The initial stress exerted on the diffuser 16 by a spring 24, the first _{H 2} inlet 28 is closed. Due to the closed first H ₂ inflow section 28, H ₂ cannot reach the flow section of the delivery unit 8. H ₂ discharged from the first H ₂ inlet 28 is sent from the fuel cell stack via a separate second inlet 36 in the middle of the flow passage of the delivery unit 8 that is proposed for example by the present invention gaseous recycle, in particular serve as a gaseous driving medium for the H ₂ recycle.

The magnetic circuit 30 is formed by a pole 10, a nozzle 12, and an axially adjustable diffuser.

In addition to the first H ₂ inflow section 28, the nozzle 12 stationaryly housed in the delivery unit 8 includes a second H ₂ inflow section 36. A gaseous hydrogen flows through the second H ₂ inflow section 36 in the central flow cross section of the delivery unit 8. Flows into the center of the flow passage of the first H ₂ inlet 28 via a delivery unit 8, depending on the flow rate of gaseous H ₂ which serves as a driving medium, flows through the second inlet 36 recycle, in particular H ₂ recycle is sent. The size of the central flow rate of H ₂ flowing into the flow cross-section of the delivery unit 8 from the first H ₂ inlet 28, defines the delivery rate of H ₂ recycle from the second H ₂ inlet 36 ..

As apparent from the drawing in FIG. 1, the first H ₂ inlet 28 extends through the nozzle 12 communicates with the elastomeric sealing material 26 in the area of the sheet. As already mentioned, the first H ₂ inflow section 28 when diffuser 16 is in the rest position, is closed on the basis of the initial stress exerted by the spring 24. As soon as the adjusting member 18, preferably configured as a magnetic coil, is operated, the position adjustable diffuser 16 is attracted from the resting position when the adjusting member is in a non-energized state, as proposed by the present invention. communicating portion of H ₂ inlet 28 to the central flow cross-section of the delivery unit 8 is released. In particular, the communication point has a large flow cross section or a small flow cross section depending on the energization of the adjusting member 18 configured as a magnetic coil. Depending on the flow cross section in the communication point of the first H ₂ inlet 28, the discharge rate of the gaseous propellant flowing out from the first H ₂ inlet 28 into the center of the flow cross-section results.

The active position adjustment of the diffuser 16 in the axial direction 42 is performed by energizing an adjusting member 18 which is encapsulated and housed in a bearing portion 20, preferably configured as a magnetic coil. When energization of the adjustment member 18 is performed, the diffuser 16 against the initial stress generated by the spring 24 is attracted, the seat is opened at the end of the first H ₂ inlet 28. At the same time, the opening of the first H ₂ inlet 28 is carried out particularly according to the energization of the formed adjustment member 18 as a magnetic coil, whereby, so that the width 46 of the annular gap 44 varies .. The annular gap 44 between the nozzle 12 stationaryly arranged in the delivery unit 8 on one side and the diffuser 16 which can be actively adjusted in the axial direction 42 on the other side expands according to the degree of energization of the adjusting member 18. Or it will be narrowed down.

When the first H ₂ inflow portion 28 is open, the gaseous H ₂ passes through the annular gap 44 and flows parallel to the axis of symmetry 52 of the delivery unit 8 proposed by the present invention. _{It flows into the recirculating H 2} flow that flows into the delivery unit without being hindered through the H _{2 inflow portion 36 of the above.} The annular gap 44 between the nozzle 12 and the position-adjustable diffuser 16 is, on the one hand, separated by the nozzle surface 50 of the nozzle 12 stationary on the delivery unit 8 and, on the other hand, is axially adjustable. It is separated by the diffuser surface 48 of the diffuser 16. The annular gap 44 is narrowed in the direction of the communication location according to the axial position of the position-adjustable diffuser 16 based on the different inclinations of the diffuser surface 48 and the stationary nozzle surface 50. When the adjusting member 18 is not energized, the sealing member in the form of elastomeric seal member 26 which is inserted in a position adjustable diffuser 16 to close the first H ₂ inlet 28. Thereby, the position adjustable diffuser 16 has a sealing function, this means that when the first H ₂ inlet 28 is closed, the H ₂ to serve as a gaseous driving medium means that the inflow is blocked, i.e., the first H ₂ inlet 28 in this case is turned off.

The magnetic separator 14 is coupled to the nozzle 12 and the pole 10 by a preferably airtight material bonding process. A connection, not shown in detail, of an adjusting member 18, preferably configured as a magnetic coil, is guided outward on both sides of the delivery unit 8 through a hole in the housing, lid, and pole 10 of the delivery unit 8. be able to.

In the embodiment shown in Figure 1 of the delivery unit 8 that is proposed by the present invention, the first H ₂ inlet 28 has a horizontal section 40 and vertical section 38. The first H ₂ inlet 28 thus extends at a right angle through the material arranged nozzle 12 stationary the delivery unit 8. For manufacturing engineering convenience to the material of the nozzle 12, the above-mentioned vertical zone 38 and horizontal zone 40 can be made as holes in a particularly simple manner. Depending on the diameter chosen, gaseous H ₂ mass flow rate through the first H ₂ inlet 28 is caused through the first H ₂ inlet 28.

In the embodiment shown in FIG. 1, while the gaseous H ₂ recirculating flows in the region of the symmetry axis 52 of the second H ₂ through the inlet 36 into the main flow section delivery unit 8 of the nozzle 12 Te, the position adjustable diffuser 16 in the axial direction 42, it is possible to realize an open or closed in the first H ₂ inlet 28 when the adjusting member 18 that is configured as a magnetic coil is operated. After the first H ₂ inlet 28 of the delivery unit 8 is open, if preferably is configured as a magnetic coil is energized correspondingly adjusting member 18 which is supported on the bearing point 20, the width 46 of annular gap 44 Changes can be realized. Whereby if thus required, especially when the part load operation, it is possible to influence accurately to the flow rate of gaseous H ₂ flowing. Based on the injection pump effect, the recirculating H ₂ is second from the fuel cell stack _{, depending on the flow velocity of the gaseous H 2} discharged at the communication point of the annular gap 44 in the region of the symmetry axis 52 of the delivery unit 8. It is guided to the inflow part 36 of. In contrast, preferably when constructed adjustment member 18 as a magnetic coil is not energized, the first H ₂ inlet 28 is closed. This is because the discharge portion is closed by the sealing member in the form of the elastomer sealing material 26 that exerts a sealing function in the material of the nozzle 12. Reference numeral 54 represents a needle of a delivery unit 8 configured as an injection pump.

The present invention is not limited to the examples described herein and the aspects highlighted therein. Rather, within the scope of the claims, a number of modifications within the framework of those skilled in the art are possible.

8 Sending unit 12 Nozzle 16 Diffuser 18 Adjusting member 20 Bearing location 24 Spring 26 Elastomer sealant 28 H ₂ Inflow part 42 Axial direction 44 Annular gap 48 Diffuser surface 50 Nozzle surface

Claims (9)

A delivery unit (8) for a fuel cell system having a nozzle (12) and an annularly configured diffuser (16), wherein the diffuser (16) is located inside the delivery unit (8). position adjustable der axially (42) through the adjusting member (18) has is,
An annular gap (44) is formed between the nozzle (12) and the diffuser (16).
The annular gap (44) is separated by one diffuser surface (48) and the other nozzle surface (50).
It said annular gap (44), the according to the axial position of the diffuser (16) that are narrowing in the direction of the communicating points, delivery unit, characterized in that (8). The delivery unit (8) according to claim 1, wherein the diffuser (16) is housed in a bearing portion (20) including the adjusting member (18). The delivery unit (8) according to claim 1, wherein the adjusting member (18) is an electromagnet. 1. The nozzle (12) is stationaryly housed in the delivery unit (8), and the diffuser (16) is positioned relative to the diffuser (16) in the axial direction (42). The transmission unit (8) according to any one of 3 to 3. The delivery unit (8) according to any one of claims 1 to 4, wherein the diffuser (16) is subjected to an initial stress in the axial direction (42) by a spring (24). The delivery unit (8) according to claim 5, wherein the spring (24) is supported by a press-fit ring (22) press-fitted into the pole (10) of the delivery unit (8). Claims 1 to 6 , wherein the diffuser (16) closes the first H2 inflow portion (28) by the sealing member (26) when the adjusting member (18) is not operated. The transmission unit (8) according to any one of the above items. When the first H2 inflow portion into the annular gap (44) is opened to operate the adjusting member (18) and the adjusting member (18) is appropriately operated, the diffuser surface (48) and the above. The delivery unit (8) according to any one of claims 1 to 7, wherein the gap width between the nozzle surfaces (50) can be adjusted. The method for using the delivery unit (8) according to any one of claims 1 to 8 in a fuel cell system .

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