Ejector for fuel cell and fuel cell assembly with same

Abstract

The utility model relates to the field of fuel cells, in particular to an ejector for a fuel cell and a fuel cell assembly with the ejector, the ejector comprises an ejector body, an ejection channel and an ejection outlet are arranged in the ejector body, and a partition plate mechanism is arranged in the ejection channel; a spoiler is arranged on the inner wall of the injection outlet; according to the utility model, the baffle plate mechanism and the spoiler are arranged on the ejector; through the cooperative use of the flow choking partition plate and the spoiler, the flow choking partition plate can realize the division of a liquid water film and a hydrogen gas flow; liquid water can be conveniently accumulated at the injection outlet; and the spoiler is used as an atomizing piece, during subsequent use, the hydrogen drives the liquid water to move into the electric pile, and the atomization degree of the liquid water is increased through blocking of the spoiler, so that the liquid water is refined, and liquid drops and gas flow after subsequent refining conveniently and uniformly enter the electric pile instead of being gathered at the front end of the electric pile.

Description

Technical Field

[0001] The utility model relates to the field of fuel cells, and more specifically to an ejector for a fuel cell and a fuel cell assembly having the ejector. Background Art

[0002] Existing systems are gradually adopting ejectors as part of the hydrogen circulation. The ejector can help the system reduce power consumption, and convert the potential energy of fresh hydrogen into kinetic energy to suck the recycled hydrogen into the inlet of the fuel cell stack.

[0003] At the same time, due to the difference in temperature between the fresh hydrogen and the recycled hydrogen, a certain amount of liquid water will precipitate during the mixing of the ejector.

[0004] When the liquid water moves to the inlet of the fuel cell stack, it may adhere to the inner wall of the pipeline and form a water film, which will eventually be brought into the first few cells of the fuel cell stack, causing problems such as local flooding; in severe cases, it will reduce the consistency of the fuel cell stack.

[0005] Existing Patent 202311506226.4 - A fuel cell stack beneficial to improving consistency; although it can improve the consistency of the fuel cell stack; however, based on the content disclosed in this patent, its improvement lies in the structure of the fuel cell stack, not in the ejector.

[0006] In order to improve at least one of the above problems, it is necessary to optimize the design of the existing ejector. Summary of the Utility Model

[0007] The purpose of the utility model is to provide an ejector that can reduce the accumulation of water liquid on the single cell at the front end of the fuel cell stack.

[0008] In order to achieve the above purpose, the technical solution adopted by the utility model is as follows:

[0009] An ejector for a fuel cell, comprising an ejector body, an ejector channel is arranged inside the ejector body, an ejector outlet is arranged on the ejector body, and the ejector outlet is communicated with the ejector channel;

[0010] A partition mechanism is arranged inside the ejector channel; the partition mechanism includes a flow - blocking partition arranged on the inner wall of the ejector channel;

[0011] One end of each flow - blocking partition is connected to the ejector channel, and the other end extends freely; the free end of the flow - blocking partition is spaced from the inner wall of the ejector channel.

[0012] The partition mechanism includes a plurality of flow - blocking partitions spaced apart on the ejector channel.

[0013] The end of each flow - blocking partition adopts an arc - surface transition.

[0014] A spoiler is provided on the inner wall of the ejector outlet; the spoiler is protrudingly provided on the inner wall of the ejector outlet.

[0015] The ejector passage and the ejector outlet are arranged in a mutually perpendicular direction.

[0016] The vertical cross-section of the spoiler is a right triangle.

[0017] A fuel cell assembly includes an intake end plate, and the intake end plate is connected with the ejector for fuel cells.

[0018] The advantages of the present utility model are as follows:

[0019] The present utility model discloses an ejector for fuel cells and a fuel cell assembly having the ejector.

[0020] The present utility model is provided with a partition mechanism and a spoiler on the ejector; through the combined use of the flow-blocking partition and the spoiler, the flow-blocking partition can realize the division of the liquid water film and the hydrogen gas flow; it is convenient for the liquid water to accumulate at the ejector outlet; and the function of the spoiler is to act as an atomizing member. During subsequent use, the hydrogen gas drives the liquid water to move into the fuel cell stack. After being blocked by the spoiler, the atomization degree of the liquid water is increased, so that the liquid water is refined, and it is convenient for the subsequent refined liquid droplets and the gas flow to uniformly enter the fuel cell stack instead of gathering at the front end of the fuel cell stack. Description of the Drawings

[0021] The following briefly describes the content expressed in each drawing of the specification of the present utility model and the marks in the drawings:

[0022] Figure 1 It is a structural schematic diagram of the present utility model.

[0023] Figure 2 It is a partial cross-sectional view of the ejector passage in the present utility model.

[0024] The marks in the above drawings are all:

[0025] 1. Ejector, 11. Ejector body, 2. Ejector outlet, 3. Ejector passage, 4. Flow-blocking partition, 5. Spoiler. Specific Embodiments

[0026] The following further details the specific embodiments of the present utility model by describing the optimal embodiments with reference to the drawings.

[0027] An ejector for a fuel cell, comprising an ejector body 11. An ejector channel 3 is provided inside the ejector body 11. An ejector outlet 2 is provided on the ejector body 11, and the ejector outlet 2 is communicated with the ejector channel 3. A partition mechanism is provided inside the ejector channel 3. The partition mechanism includes a flow-blocking partition 4 provided on the inner wall of the ejector channel 3. One end of each flow-blocking partition 4 is connected to the ejector channel 3, and the other end extends freely. The free end of the flow-blocking partition 4 is spaced from the inner wall of the ejector channel 3. A spoiler 5 is provided on the inner wall of the ejector outlet 2. By providing a partition mechanism and a spoiler 5 on the ejector 1, through the combined use of the flow-blocking partition 4 and the spoiler 5, the flow-blocking partition 4 can divide the liquid water film and the hydrogen gas flow, facilitating the accumulation of liquid water at the ejector outlet 2. The function of the spoiler 5 is to act as an atomizing member. During subsequent use, hydrogen drives the liquid water to move into the fuel cell stack. After being blocked by the spoiler 5, the atomization degree of the liquid water is increased, so that the liquid water is refined, facilitating the subsequent refined droplets and the gas flow to enter the fuel cell stack evenly instead of aggregating at the front end of the fuel cell stack.

[0028] The ejector 1 for a fuel cell disclosed in the present invention is mainly applicable to a hydrogen fuel cell, and the ejector 1 disclosed in the present invention is also used for the mixed supply of recycled hydrogen and fresh hydrogen into the fuel cell stack during subsequent use.

[0029] The ejector 1 disclosed in the present invention mainly includes an ejector body 11. The ejector body 11 is the main structure of the ejector 1. An ejector channel 3 is provided inside the ejector body 11. An ejector outlet 2 is provided on the ejector body 11, and the ejector outlet 2 is communicated with the ejector channel 3. The ejector channel 3 is an air flow channel, and the ejector outlet 2 facilitates subsequent connection to the fuel cell stack inlet.

[0030] In the present invention, a partition mechanism is provided inside the ejector channel 3. The partition mechanism is mainly used to divide the liquid water film and the hydrogen gas flow. During subsequent use, the liquid water accumulates on the outer wall surface of the flow-blocking partition 4 and finally accumulates at the bottom of the ejector channel 3.

[0031] In other words, the partition mechanism disclosed in the present invention is mainly arranged on the inner wall of the ejector channel 3 to play a flow-blocking role.

[0032] At the same time, in the present invention, the partition mechanism includes a flow-blocking partition 4 provided on the inner wall of the ejector channel 3. One end of each flow-blocking partition 4 is connected to the ejector channel 3, and the other end extends freely. The free end of the flow-blocking partition 4 is spaced from the inner wall of the ejector channel 3. Based on such a setting, the flow-blocking partition 4 can not only achieve a flow-blocking effect but also ensure the normal flow supply of hydrogen.

[0033] In the utility model, the baffle plate 4 is generally arranged perpendicular to the flow direction of hydrogen. It can be seen from the attached drawings that the baffle plate 4 of the utility model is generally arranged horizontally; one side is connected to the inner wall of the ejection channel 3, and is spaced apart from the inner wall of the ejection channel 3 on the other side. Based on such a setting, the liquid water film and the hydrogen gas flow can be better separated while the normal circulation of hydrogen can be achieved.

[0034] In the utility model, a spoiler 5 is provided on the inner wall of the ejection outlet 2; in the utility model, the spoiler 5 is a blocking plate structure, based on such a setting, it can hinder the flow of gas, and then hinder the water flowing with the gas, and the liquid, driven by the gas, hits the spoiler 5, so that large particles of water are refined into small droplets, and at the same time, driven by the intake airflow, flows into the common channel of the battery stack, thereby reducing or avoiding the accumulation of water on the several single-chip batteries at the front end of the battery stack; reducing the influence of the ejector 1 on the consistency of the battery stack.

[0035] Furthermore, in the utility model, the baffle mechanism includes a plurality of flow-blocking baffles 4 spaced apart and distributed on the injection channel 3; in the utility model, the number and position of the flow-blocking baffles 4 are set according to the length of the injection channel 3; it is generally required that adjacent flow-blocking baffles 4 are spaced apart and arranged in parallel; it is required to arrange one at the edge of the injection outlet 2. Such a setting facilitates the subsequent drainage, so that the divided water is accumulated at the bottom of the injection channel 3.

[0036] Furthermore, in the present invention, each end of the baffle plate 4 adopts an arc surface transition; such a setting facilitates the water on the baffle plate 4 to drip to the bottom of the injection channel 3 during subsequent use.

[0037] Furthermore, in the utility model, the spoiler 5 is protrudingly arranged on the inner wall of the ejection outlet 2; here, the spoiler 5 is a raised block structure, which mainly impacts the water liquid flowing with the intake air flow to refine it and reduce the accumulation of water liquid at the front end of the battery stack.

[0038] Furthermore, in the utility model, the ejection channel 3 and the ejection outlet 2 are arranged in mutually perpendicular directions; based on such a setting, it is convenient for the divided liquid to accumulate at the bottom of the ejection channel 3, and it is also convenient for the subsequent docking with the end plate of the fuel cell stack, reducing the space occupied horizontally by the ejection channel 3, optimizing the overall layout of the fuel cell, and at the same time, it is also convenient for the subsequent spoiler 5 to impact the water.

[0039] Further, in the present utility model, the vertical cross-section of the spoiler 5 is a right triangle; in the present utility model, it is required that the outer surface of the spoiler 5 is flush with the outer surface of the ejector body 11, and at the same time, it is required that the inclined surface of the right triangle is arranged close to the ejection channel 3. Based on such a setting, the spoiler 5 not only realizes the impact of water and liquid, but also plays a role in disturbing the flow, which is beneficial to increasing the gas operation path; reducing the accumulation of water and liquid at the front end of the fuel cell stack.

[0040] A fuel cell assembly includes an intake end plate, and the intake end plate is connected with the fuel cell ejector 1.

[0041] Specifically:

[0042] The ejector 1 structure of the work card of the present utility model is mainly to solve the technical problem that the liquid water film directly flows into the fuel cell stack and affects the performance of the first few pieces in the prior art. By the combined use of the flow blocking partition 4 and the spoiler 5 in the present utility model, the water film can be aggregated before entering the stack, and through the structural design, the liquid water is broken up by the gas and evenly brought into the fuel cell stack.

[0043] The specific scheme includes the following steps:

[0044] A flow blocking partition 4 is arranged in the ejection channel 3 between the ejection outlet 2 where the ejector body 11 is connected to the fuel cell stack inlet; there is a gap between the flow blocking partition 4 and the wall surface of the ejection channel 3; a spoiler 5 is arranged at the ejection outlet 2; the ejection channel 3 from the ejector 1 to before entering the stack is designed with a flow blocking partition 4 to divide the liquid water film and the hydrogen gas flow; the liquid water accumulates on the outer wall surface of the flow blocking partition 4 and finally accumulates at the bottom of the ejection channel 3; the spoiler 5 is used to guide the water and gas flow accumulated at the bottom, thereby breaking the water film to refine the liquid droplets and evenly enter the fuel cell stack with the gas flow instead of accumulating on the first few front pieces; through the optimization of the geometric dimensions of the established partition and the deflector structure, the best water film breaking effect is finally achieved.

[0045] Obviously, the specific implementation of the present utility model is not limited by the above-mentioned manner. As long as various non-substantial improvements are made by adopting the method concept and technical solution of the present utility model, they are all within the protection scope of the present utility model.

Claims

1. An ejector for a fuel cell, characterized in that: It comprises an ejector body, wherein an ejector channel is arranged in the ejector body, an ejector outlet is arranged on the ejector body, and the ejector outlet is connected with the ejector channel; A baffle mechanism is provided in the ejection channel; the baffle mechanism comprises a flow-blocking baffle provided on the inner wall of the ejection channel; One end of each of the flow-blocking baffles is connected to the ejection channel, and the other end is freely extended; the free end of the flow-blocking baffle is spaced apart from the inner wall of the ejection channel; A spoiler is arranged on the inner wall of the injection outlet.

2. The ejector for a fuel cell according to claim 1, characterized in that: The baffle mechanism comprises a plurality of flow-blocking baffles which are spaced apart and distributed on the ejection channel.

3. The ejector for a fuel cell according to any one of claims 1 to 2, characterized in that: Each end of the baffle plate adopts arc surface transition.

4. The ejector for a fuel cell according to claim 1, characterized in that: The spoiler is arranged protrudingly on the inner wall of the injection outlet.

5. The ejector for a fuel cell according to claim 4, characterized in that: The ejection channel and the ejection outlet are arranged in mutually perpendicular directions.

6. The ejector for a fuel cell according to claim 4, characterized in that: The vertical cross section of the spoiler is a right triangle.

7. A fuel cell assembly, characterized in that: It comprises an air intake end plate, to which the air intake end plate is connected the ejector for the fuel cell as claimed in any one of claims 1 to 6.

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