Tail exhaust structure for fuel cell system, fuel cell system and vehicle

Abstract

The utility model provides a tail exhaust structure for a fuel cell system, the fuel cell system and a vehicle, the tail exhaust structure for the fuel cell system comprises a bent tail exhaust pipe, the tail exhaust pipe is vertically arranged in the fuel cell system, and an inlet of the tail exhaust pipe is higher than an outlet of the tail exhaust pipe; a plurality of branch pipes are arranged on the tail discharge pipe, the branch pipes are arranged at intervals in the height direction of the tail discharge pipe, each branch pipe is provided with an extension section extending into the tail discharge pipe, and communication openings, communicated with the interior of the tail discharge pipe, of the extension sections are arranged close to the outlet. According to the tail exhaust structure for the fuel cell system, when each branch pipe is connected with a hydrogen-related pipeline in the fuel cell system, hydrogen backflow can be effectively prevented by utilizing the shape of the tail exhaust pipe, the extension section of each branch pipe positioned in the tail exhaust pipe and the communication opening on each extension section close to the outlet of the tail exhaust pipe; and a good use effect is achieved.

Description

Technical Field

[0001] The utility model relates to the technical field of fuel cells, in particular to an exhaust structure for a fuel cell system. The utility model also relates to a fuel cell system provided with the above exhaust structure for a fuel cell system. At the same time, the utility model also relates to a vehicle provided with the above fuel cell system. Background Art

[0002] In a fuel cell system, after air and hydrogen react inside the stack, a mixed gas containing water vapor, air, hydrogen, nitrogen, etc. will be generated, and this mixed gas needs to be discharged through an exhaust pipe. In addition, in the entire fuel cell system, in addition to generating waste gas, there is also air in the cooling water circuit and mixed gas for purging the inside of the stack box, etc.

[0003] In the design of the existing exhaust pipe, it is generally discharged in several ways, or multiple connection interfaces are provided on the exhaust pipe to be integrated on the same exhaust pipe and discharged together using the same exhaust pipe. However, for an exhaust pipe integrated with multiple connection interfaces, in terms of structure, since the connection interfaces are arranged at the same height of the exhaust pipe, although the arrangement sequence positions are different, there is a risk of hydrogen backflow to other components during the operation and shutdown of the fuel cell. Summary of the Utility Model

[0004] In view of this, the utility model aims to provide an exhaust structure for a fuel cell system to effectively prevent the backflow of the gas stream containing hydrogen.

[0005] To achieve the above object, the technical solution of the utility model is realized as follows:

[0006] An exhaust structure for a fuel cell system, including a bent exhaust pipe, the exhaust pipe is vertically arranged in the fuel cell system, and the inlet of the exhaust pipe is arranged higher than the outlet of the exhaust pipe;

[0007] A plurality of branch pipes are provided on the exhaust pipe, the plurality of branch pipes are arranged at intervals along the height direction of the exhaust pipe, and each branch pipe has an extension section extending into the exhaust pipe, and the communication ports of each extension section communicating with the inside of the exhaust pipe are all arranged close to the outlet.

[0008] Furthermore, each branch pipe is located in the lower part of the exhaust pipe, and the plurality of branch pipes include a first branch pipe and a second branch pipe, the first branch pipe is used to communicate with the stack purge exhaust pipeline of the fuel cell system, and the second branch pipe is used to communicate with the hydrogen circulation exhaust pipeline of the fuel cell system.

[0009] Furthermore, the communication port of the second branch pipe is arranged closer to the outlet than the communication port of the first branch pipe.

[0010] Furthermore, the first branch pipe is arranged higher than the second branch pipe; and / or, the tail exhaust pipe includes a vertical pipe section, a bent pipe section, and a horizontal pipe section that are sequentially connected from top to bottom. The vertical pipe section is vertically arranged, and the horizontal pipe section is horizontally arranged. A plurality of the branch pipes are respectively inserted into the horizontal pipe section from the bent pipe section.

[0011] Furthermore, a first connection port is provided on the tail exhaust pipe. The first connection port is used to communicate with the drain port of the water separator of the fuel cell system, and the first connection port is arranged at the lower part inside the tail exhaust pipe.

[0012] Furthermore, a second connection port is provided on the tail exhaust pipe. The second connection port is used to communicate with the air outlet of the air bearing of the fuel cell system, and the second connection port is arranged at the upper part inside the tail exhaust pipe.

[0013] Furthermore, a fixing bracket is provided on the tail exhaust pipe, and the tail exhaust pipe is installed on an external component through the fixing bracket.

[0014] Furthermore, a mounting bracket is provided on the tail exhaust pipe, and the mounting bracket is used to mount a hydrogen concentration detection device.

[0015] Compared with the prior art, the present utility model has the following advantages:

[0016] For the tail exhaust structure for a fuel cell system of the present utility model, when the branch pipes are connected to the hydrogen-related pipelines in the fuel cell system, by using the shape of the tail exhaust pipe itself, the extended section of the branch pipe located in the tail exhaust pipe, and the setting that the communication port on the extended section is close to the outlet of the tail exhaust pipe, not only can each hydrogen-related pipeline be discharged through the same tail exhaust pipe, improving the integration degree of the tail exhaust pipe, but also the backflow of hydrogen in the hydrogen-related pipelines can be effectively prevented. In addition, the plurality of branch pipes include a first branch pipe and a second branch pipe, which is conducive to the discharge of the gas in the purge exhaust pipeline of the fuel cell stack and the gas and liquid in the hydrogen circulation exhaust pipeline through the tail exhaust pipe, and arranging each branch pipe at the lower part of the tail exhaust pipe can further effectively prevent the backflow of hydrogen in the hydrogen-related pipelines. The communication port of the second branch pipe is arranged closer to the outlet than that of the first branch pipe, which is conducive to the discharge of the gas and liquid in the second branch pipe and can further prevent the backflow of hydrogen in the second branch pipe.

[0017] Secondly, the first branch pipe is arranged higher than the second branch pipe, which can effectively avoid the liquid discharged from the second branch pipe from condensing and blocking the communication port of the first branch pipe in a low-temperature environment. The tail exhaust pipe adopts a vertical pipe section, a bent pipe section, and a horizontal pipe section that are sequentially connected, and has the characteristics of simple structure and convenient processing and manufacturing. The first connection port arranged at the lower part inside the tail exhaust pipe can communicate with the drain port of the water separator, facilitating the discharge of the liquid separated by the water separator through the tail exhaust pipe and further improving the integration degree of the tail exhaust pipe.

[0018] In addition, a second connection port is provided at the upper part inside the tail exhaust pipe, which can communicate with the air outlet of the air bearing. Thus, it is convenient for the gas entering the air bearing to be discharged through the tail exhaust pipe, and the integration degree of the tail exhaust pipe can be further improved. The provision of the fixing bracket facilitates the installation of the tail exhaust pipe on an external component. The provision of the mounting bracket facilitates the installation of the hydrogen concentration detection device, which is conducive to detecting the hydrogen concentration outside the tail exhaust pipe, so as to detect in time whether there is hydrogen leakage in the exhaust pipeline.

[0019] Another object of the present invention is to provide a fuel cell system, in which a tail exhaust structure for a fuel cell system as described above is provided.

[0020] Another object of the present invention is to provide a vehicle, on which the above-mentioned fuel cell system is provided.

[0021] The fuel cell system and the vehicle of the present invention and the tail exhaust structure for a fuel cell system as described above have the same beneficial effects as those of the prior art, and will not be elaborated herein. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] The accompanying drawings that form a part of the present invention are used to provide a further understanding of the present invention. The schematic embodiments and descriptions thereof of the present invention are used to explain the present invention and do not constitute an improper limitation on the present invention. In the drawings:

[0023] Figure 1 is a schematic structural diagram of the tail exhaust structure for a fuel cell system according to an embodiment of the present invention from a first perspective;

[0024] Figure 2 is a schematic structural diagram of the tail exhaust structure for a fuel cell system according to an embodiment of the present invention from a second perspective;

[0025] Figure 3 is a schematic structural diagram of the tail exhaust structure for a fuel cell system according to an embodiment of the present invention from a third perspective;

[0026] Figure 4 is Figure 3 a cross-sectional view taken along the A-A viewing direction in;

[0027] Description of the reference numerals:

[0028] 1. Tail exhaust pipe; 101. First connection port; 102. Second connection port; 11. First branch pipe; 12. Second branch pipe; 13. Fixing bracket; 14. Mounting bracket;

[0029] 10. Main inlet; 20. Main outlet; 111. First inlet; 112. First outlet; 121. Second inlet; 122. Second outlet; 1101. First extension section; 1102. First outward extension section; 1201. Second extension section; 1202. Second outward extension section; 100. Vertical pipe section; 200. Elbow pipe section; 300. Horizontal pipe section. Detailed implementation manners

[0030] It should be noted that, without conflict, the embodiments in the present utility model and the features in the embodiments may be combined with each other.

[0031] In the description of the present utility model, it should be noted that if terms indicating orientation or positional relationship such as "upper", "lower", "inner", "outer", etc. appear, they are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as a limitation to the present utility model. In addition, if terms such as "first", "second", etc. appear, they are also only for descriptive purposes and cannot be understood as indicating or implying relative importance.

[0032] In addition, in the description of the present utility model, unless otherwise clearly defined, the terms "installation", "connection", "connection", "connecting member" should be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or an integral connection; it may be a mechanical connection or an electrical connection; it may be directly connected or indirectly connected through an intermediate medium, and it may be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood in combination with specific situations.

[0033] The present utility model will be described in detail below with reference to the drawings and in combination with embodiments.

[0034] Embodiment 1

[0035] This embodiment relates to an exhaust structure for a fuel cell system, which can effectively prevent the backflow of the gas stream containing hydrogen.

[0036] In terms of the overall composition, as Figures 1 to 4 shown, the exhaust structure for the fuel cell system in this embodiment includes a curved exhaust pipe 1, which is vertically arranged in the fuel cell system, and the inlet of the exhaust pipe 1 is set higher than the outlet of the exhaust pipe. Moreover, a plurality of branch pipes are provided on the exhaust pipe 1, the plurality of branch pipes are arranged at intervals along the height direction of the exhaust pipe 1, and each branch pipe has an extension section extending into the exhaust pipe 1, and the communication ports where the extension sections communicate with the inside of the exhaust pipe are all arranged close to the outlet of the exhaust pipe 1.

[0037] At this time, in the above structure, the tail exhaust pipe 1 is connected to the end of the tail exhaust pipeline in a bent shape, and when the branch pipe is connected to the hydrogen-containing pipeline in the fuel cell system, by using the shape of the tail exhaust pipe 1 itself, the extended section of the branch pipe located in the tail exhaust pipe 1, and the arrangement that the communication port on the extended section is close to the outlet of the tail exhaust pipe, not only can each hydrogen-containing pipeline be discharged through the same tail exhaust pipe, improving the integration degree of the tail exhaust pipe, but also can effectively prevent the backflow of hydrogen in the hydrogen-containing pipeline.

[0038] It should be noted that the above-mentioned hydrogen-containing pipeline specifically refers to a pipeline in which the medium flowing through it contains hydrogen, and the hydrogen content in this pipeline is greater than the hydrogen content in the air. The hydrogen-containing pipeline can be, for example, the stack purge exhaust pipeline of the fuel cell, or the hydrogen circulation exhaust pipeline of the fuel cell (i.e., the drain and hydrogen discharge pipeline), and of course, it can also be other pipelines for discharging hydrogen-containing substances.

[0039] Specifically, referring to Figures 1 to 4 As shown, in this embodiment, the tail exhaust pipe 1 is a 90° elbow pipe, and the two ends of the tail exhaust pipe 1 respectively form an inlet and an outlet for the medium to pass through. And in the specific structure, the tail exhaust pipe 1 includes a vertical pipe section 100, an elbow pipe section 200, and a horizontal pipe section 300 connected in sequence from top to bottom. The vertical pipe section 100 is vertically arranged, and the horizontal pipe section 300 is horizontally arranged. In specific implementation, the tail exhaust pipe 1 is connected to the end of the tail exhaust pipeline in the fuel cell system through the inlet, and the outlet of the tail exhaust pipe 1 is used to communicate with the atmosphere.

[0040] The above-mentioned multiple branch pipes are all located in the lower part of the tail exhaust pipe 1, that is, they are respectively inserted into the horizontal pipe section 300 from the elbow pipe section 200. And, as a preferred implementation manner, in this embodiment, the multiple branch pipes include a first branch pipe 11 and a second branch pipe 12. Among them, the first branch pipe 11 is used to communicate with the stack purge exhaust pipeline of the fuel cell system, and the second branch pipe 12 is used to communicate with the hydrogen circulation exhaust pipeline of the fuel cell system.

[0041] At this time, the setting of the first branch pipe 11 and the second branch pipe 12 can enable the gas in the stack purge exhaust pipeline of the fuel cell and the gas and liquid in the hydrogen circulation exhaust pipeline to be discharged through the tail exhaust pipe 1, and arranging each branch pipe in the lower part of the tail exhaust pipe 1 can further effectively prevent the backflow of hydrogen in the hydrogen-containing pipeline.

[0042] Since the hydrogen content emission in the hydrogen circulation exhaust pipeline, that is, the drain and hydrogen discharge pipeline, is higher than the hydrogen content emission in the stack purge exhaust pipeline, in order to further reduce the risk of hydrogen backflow in the branch pipe, in this embodiment, preferably, still referring to Figures 1 to 4 As shown, the communication port of the second branch pipe 12 is arranged closer to the outlet than the communication port of the first branch pipe 11.

[0043] For the convenience of distinction, in this embodiment, the inlet and the communication port of the first branch pipe 11 are respectively defined as the first inlet 111 and the first outlet 112, the inlet and the communication port of the second branch pipe 12 are respectively defined as the second inlet 121 and the second outlet 122, and the inlet and the outlet of the tail exhaust pipe 1 are defined as the main inlet 10 and the main outlet 20.

[0044] The first branch pipe 11 has a connected first extension section 1102 and a first elongation section 1101 in its specific structure. The first extension section 1102 is located outside the tail exhaust pipe 1, and the first elongation section 1101 is located inside the tail exhaust pipe 1. The second branch pipe 12 has a connected second extension section 1202 and a second elongation section 1201 in its specific structure. Similarly, the second extension section 1202 is located outside the tail exhaust pipe 1, and the second elongation section 1201 is located inside the tail exhaust pipe 1. At this time, the first inlet 111 and the second inlet 121 are located outside the tail exhaust pipe 1, which is convenient for connecting with the purge exhaust gas pipeline and the hydrogen circulation exhaust gas pipeline of the fuel cell stack respectively. The first outlet 112 and the second outlet 122 are respectively located inside the tail exhaust pipe 1. Thus, it can greatly reduce the reverse flow of the gas discharged through the first outlet 112 and the second outlet 122 through the tail exhaust pipe 1. Moreover, the second outlet 122 is arranged closer to the main outlet 20 than the first outlet 112, which can further prevent the gas discharged from the second branch pipe 12 from flowing back through the tail exhaust pipe 1.

[0045] Since the second branch pipe 12 is used to communicate with the hydrogen circulation exhaust gas pipeline, the products after hydrogen circulation are mainly water and hydrogen. At this time, in a low-temperature environment, the discharged water is likely to condense and block the communication ports of other branch pipes. For this reason, in this embodiment, as a further preferred implementation manner, the first branch pipe 11 is arranged higher than the second branch pipe 12, so that the second outlet 122 of the second branch pipe 12 is located below the first outlet 112 of the first branch pipe 11, which can effectively prevent the liquid discharged from the second branch pipe 12 from condensing and blocking the first outlet 112 in a low-temperature environment.

[0046] See Figures 1 to 4 As shown, in this embodiment, on the basis that the tail exhaust pipe 1 is provided with the first branch pipe 11 and the second branch pipe 12, a first connection port 101 is also provided on the tail exhaust pipe 1. The first connection port 101 is used to communicate with the drain port of the water separator of the fuel cell system, and the first connection port 101 is arranged at the lower part inside the tail exhaust pipe 1. Such an arrangement can enable the liquid separated by the water separator to be smoothly discharged through the lower part of the tail exhaust pipe 1, and can also further improve the integration degree of the tail exhaust pipe. During specific implementation, the first connection port 101 is arranged on the horizontal pipe section 300, and for the convenience of connection between the drain port of the water separator and the tail exhaust pipe 1, a first connection joint is provided on the tail exhaust pipe 1. The two ports of the first connection joint located inside and outside the tail exhaust pipe 1 constitute the first connection port 101.

[0047] Continue to refer to Figures 1 to 4 As shown, a second connection port 102 is also provided on the tail exhaust pipe 1. The second connection port 102 is used to communicate with the air outlet of the air bearing of the fuel cell system. The second connection port 102 is provided in the upper part inside the tail exhaust pipe 1. By communicating with the air outlet of the air bearing through the second connection port 102, it is convenient for the gas entering the air bearing to be discharged through the tail exhaust pipe 1, and thus the integration degree of the tail exhaust pipe can be further improved. In specific implementation, the second connection port 102 is specifically located on the vertical pipe section 100. And, for the convenience of connection between the air outlet of the air bearing and the tail exhaust pipe 1, a second connection joint is provided on the tail exhaust pipe 1. The two ports of the second connection joint located inside and outside the tail exhaust pipe 1 constitute the second connection port 102.

[0048] It is worth mentioning that for the tail exhaust pipe of this embodiment, on the basis that the first branch pipe 11 and the second branch pipe 12 are provided on the tail exhaust pipe 1, in addition to both being provided with the first connection port 101 and the second connection port 102, it can also be provided with only the first connection port 101 on the tail exhaust pipe 1, or only the second connection port 102, and this is also possible.

[0049] As a preferred implementation manner, in this embodiment, a fixing bracket 13 is further provided on the tail exhaust pipe 1, and the tail exhaust pipe 1 is installed on an external component through the fixing bracket 13. The setting of the fixing bracket 13 facilitates the installation of the tail exhaust pipe 1 on the external component. In specific implementation, mounting holes are provided on the fixing bracket 13, and the tail exhaust pipe 1 is installed on the external component through the connecting pieces passing through the mounting holes. Among them, the external component can be, for example, the housing of the stack, or a connecting bracket provided on the housing of the stack. At this time, through the connection between the fixing bracket 13 and the connecting bracket, the tail exhaust pipe 1 can be installed on the stack.

[0050] In this embodiment, preferably, a mounting bracket 14 is also provided on the tail exhaust pipe 1. The mounting bracket 14 is used to mount a hydrogen concentration detection device. Among them, the hydrogen concentration detection device preferably adopts a hydrogen concentration sensor. In specific implementation, the hydrogen concentration sensor can be installed on the mounting bracket 14 through a threaded connecting piece. At this time, the setting of the hydrogen concentration detection device can facilitate the detection of the hydrogen concentration outside the tail exhaust pipe, so as to detect in time whether there is hydrogen leakage in the exhaust pipeline.

[0051] In specific implementation, both the fixing bracket 13 and the mounting bracket 14 are provided on the vertical pipe section 100 of the tail exhaust pipe 1. And preferably, the fixing bracket 13 and the mounting bracket 14 are arranged oppositely in the circumferential direction of the tail exhaust pipe 1, so as to facilitate the fixed installation of the tail exhaust pipe 1 and also facilitate the installation of the hydrogen concentration detection device.

[0052] The tail exhaust structure for the fuel cell system of this embodiment can not only improve the integration degree of the tail exhaust pipe, but also effectively prevent hydrogen from flowing back in the hydrogen-related pipeline, and has a good use effect.

[0053] Embodiment 2

[0054] This embodiment relates to a fuel cell system, in which the tail exhaust structure for the fuel cell system of Embodiment 1 is provided. Specifically, during implementation, the tail exhaust structure for the fuel cell system is installed at the lowest position of the fuel cell system, for example, installed on the housing of the stack, or installed at the lowest position of the tail exhaust system through an adapter bracket, so as to facilitate the timely discharge of the mixed gas and liquid generated during the operation of the fuel cell.

[0055] Meanwhile, this embodiment also relates to a vehicle, in which the above-mentioned fuel cell system is provided.

[0056] By adopting the tail exhaust structure for the fuel cell system of Embodiment 1, the fuel cell system and the vehicle of this embodiment can effectively prevent the hydrogen reflux in the hydrogen-containing pipeline, thereby facilitating the improvement of the service life of the fuel cell system and the performance of the vehicle.

[0057] The above are only the preferred embodiments of the present invention, and are not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention shall be included within the protection scope of the present invention.

Claims

1. A tail - exhaust structure for a fuel cell system, characterized in that: It includes a bent tail - exhaust pipe (1), the tail - exhaust pipe (1) is vertically arranged in the fuel cell system, and the inlet of the tail - exhaust pipe (1) is set higher than the outlet of the tail - exhaust pipe (1); A plurality of branch pipes are provided on the tail - exhaust pipe (1), the plurality of branch pipes are arranged at intervals along the height direction of the tail - exhaust pipe (1), and each branch pipe has an extended section extending into the tail - exhaust pipe (1), and the communication ports of each extended section communicating with the inside of the tail - exhaust pipe (1) are all arranged close to the outlet.

2. The tail - exhaust structure for a fuel cell system according to claim 1, characterized in that: Each branch pipe is located in the lower part of the tail - exhaust pipe (1), and the plurality of branch pipes include a first branch pipe (11) and a second branch pipe (12), the first branch pipe (11) is used to communicate with the stack purge exhaust gas pipeline of the fuel cell system, and the second branch pipe (12) is used to communicate with the hydrogen circulation exhaust gas pipeline of the fuel cell system.

3. The tail - exhaust structure for a fuel cell system according to claim 2, characterized in that: The communication port of the second branch pipe (12) is arranged closer to the outlet than the communication port of the first branch pipe (11).

4. The tail - exhaust structure for a fuel cell system according to claim 2, characterized in that: The first branch pipe (11) is arranged higher than the second branch pipe (12); and / or, The tail - exhaust pipe (1) includes a vertical pipe section (100), a bent pipe section (200) and a horizontal pipe section (300) connected in sequence from top to bottom, the vertical pipe section (100) is vertically arranged, the horizontal pipe section (300) is horizontally arranged, and the plurality of branch pipes are respectively inserted into the horizontal pipe section (300) from the bent pipe section (200).

5. The tail - exhaust structure for a fuel cell system according to claim 1, characterized in that: A first connection port (101) is provided on the tail - exhaust pipe (1), the first connection port (101) is used to communicate with the drain port of the water separator of the fuel cell system, and the first connection port (101) is arranged in the lower part of the tail - exhaust pipe (1).

6. The tail - exhaust structure for a fuel cell system according to claim 1, characterized in that: A second connection port (102) is provided on the tail - exhaust pipe (1), the second connection port (102) is used to communicate with the air outlet of the air bearing of the fuel cell system, and the second connection port (102) is arranged in the upper part of the tail - exhaust pipe (1).

7. The tail - exhaust structure for a fuel cell system according to any one of claims 1 to 6, characterized in that: A fixed bracket (13) is provided on the tail - exhaust pipe (1), and the tail - exhaust pipe (1) is installed on an external component through the fixed bracket (13).

8. The tail - exhaust structure for a fuel cell system according to any one of claims 1 to 6, characterized in that: An installation bracket (14) is provided on the tail - exhaust pipe (1), and the installation bracket (14) is used to install a hydrogen concentration detection device.

9. A fuel cell system, characterized in that: The fuel cell system is provided with the tail exhaust structure for a fuel cell system according to any one of claims 1 to 8.

10. A vehicle, characterized in that: The vehicle is provided with the fuel cell system according to claim 9.

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