Exhaust silencer for hydrogen fuel cell

Abstract

The utility model relates to the technical field of fuel cells, and discloses a hydrogen fuel cell exhaust silencer which comprises a barrel body, a silencing pipe, a connecting pipeline and a one-way valve, the silencing pipe penetrates through the cylinder, a first inlet is formed in one end of the silencing pipe, and a first outlet is formed in the other end of the silencing pipe. The connecting pipeline comprises a linear pipe section and a bent pipe section, the linear pipe section is arranged in the silencing pipe and is arranged in the axial direction of the silencing pipe, a second outlet is formed in the end of the linear pipe section and is close to the first outlet, the other end of the linear pipe section is communicated with the bent pipe section, and the bent pipe section is arranged in the middle of the silencing pipe. The other end of the bent pipe section penetrates through the silencing pipe and extends out of the silencing pipe to be provided with a second inlet, and the second inlet is provided with a one-way valve used for being connected with a purging pipe. The exhaust pipeline has the advantages that the connecting pipeline and the one-way valve are arranged, the purging pipe can be integrated, the integration degree of the exhaust pipeline is improved, meanwhile, tail gas backflow in the purging pipe is avoided, and the exhaust effect is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of fuel cells, in particular to an exhaust muffler for a hydrogen fuel cell. Background Art

[0002] Hydrogen fuel cell systems react with air to produce water and exhaust gases, which need to be discharged through the main exhaust pipe. To reduce noise in the main exhaust pipe, an exhaust muffler is generally installed on the main exhaust pipe. In addition, when the fuel cell stack is shut down for purge, the hydrogen and water vapor inside the stack need to be discharged through the purge pipe.

[0003] The existing exhaust muffler and purge pipe are both separately set, and the degree of integration of the exhaust pipeline is low. If you want to integrate the pipelines, you need to set up an additional integrated tail pipe to integrate multiple pipelines. The exhaust pipeline structure is relatively complex and difficult to arrange. In addition, due to the different pressures between the pipelines, the exhaust gas in the main exhaust pipeline with high pressure can easily squeeze into the purge pipeline with low pressure, resulting in backflow and poor exhaust effect. Utility Model Content

[0004] The purpose of the utility model is to provide a hydrogen fuel cell exhaust muffler, which is equipped with connecting pipes and one-way valves, can integrate the purge pipe, improve the integration of the exhaust pipeline, and at the same time avoid the backflow of exhaust gas in the purge pipe, thereby improving the exhaust effect.

[0005] In order to achieve the above-mentioned purpose, the utility model provides a hydrogen fuel cell exhaust muffler, including a cylinder, a muffler pipe, a connecting pipe, and a one-way valve;

[0006] The muffler pipe passes through the cylinder and is provided with a first inlet at one end and a first outlet at the other end;

[0007] The connecting pipe includes a straight pipe section and a bent pipe section. The straight pipe section is arranged in the silencer pipe and along the axial direction of the silencer pipe. The end of the straight pipe section is provided with a second outlet, and the second outlet is arranged close to the first outlet. The other end of the straight pipe section is connected to the bent pipe section, and the other end of the bent pipe section passes through the silencer pipe and extends to the outside of the silencer pipe to be provided with a second inlet. The second inlet is provided with a one-way valve for connecting to the purge pipe.

[0008] Furthermore, the axis of the straight pipe section and the axis of the bent pipe section are arranged at a preset angle α, and the value range of the preset angle α is 100°-150°.

[0009] Furthermore, the muffler includes a main pipe, an air inlet pipe and an air outlet pipe, the air inlet pipe is provided at one end of the main pipe, and the air outlet pipe is provided at the other end, the first inlet is provided at the end of the air inlet pipe away from the main pipe, and the first outlet is provided at the end of the air outlet pipe away from the main pipe.

[0010] Furthermore, a plurality of partitions are evenly distributed in the cylinder along the axial direction, and the plurality of partitions and the silencer pipe divide the interior of the cylinder along the axial direction to form a plurality of silencer cavities, and silencer holes are opened on the pipe wall of the silencer pipe located in the silencer cavity.

[0011] Furthermore, a drainage pipe communicating with the interior of the cylinder is provided on the side wall of the cylinder near the first inlet.

[0012] Furthermore, the cylinder includes a main body, an air inlet end cover, and an air outlet end cover. The air inlet end cover is provided at one end of the main body, and the air outlet end cover is provided at the other end of the main body. Both the air inlet end cover and the air outlet end cover are provided with a through hole for the muffler to pass through.

[0013] Furthermore, a filter is provided at the first outlet.

[0014] Furthermore, fixing brackets are provided at intervals along the axial direction on the outer side of the cylinder, and the fixing brackets are provided with mounting holes for connecting with the outside.

[0015] Furthermore, an inner wall of one end of the bent pipe section close to the second inlet is provided with an internal thread, and an outer wall of one end of the bent pipe section close to the second inlet is provided with a clamping boss.

[0016] Compared with the prior art, the hydrogen fuel cell exhaust silencer of the present utility model has the following beneficial effects: the connecting pipe includes a straight pipe section and a bent pipe section, the straight pipe section is arranged in the silencer pipe and is arranged along the axial direction of the silencer pipe, and the second outlet is arranged close to the first outlet, and the other end of the bent pipe section passes through the silencer pipe and extends to the outside of the silencer pipe and is provided with a second inlet, and the second inlet is provided with a one-way valve, so that the purge pipe can be integrated into the connecting pipe, thereby improving the integration of the exhaust pipe. In addition, the purge pipe and the one-way valve are connected, and the exhaust gas flows into the connecting pipe from the second inlet and is discharged from the second outlet, and the exhaust gas in the silencer pipe flows into the first inlet and is discharged from the first outlet. When the silencer and the purge pipe are exhausted, the exhaust gas discharges in the same flow direction, thereby avoiding mutual interference when the exhaust gas is discharged. At the same time, the one-way valve is provided to prevent the exhaust gas from flowing back into the purge pipe, thereby avoiding the formation of exhaust gas backflow in the purge pipe, thereby improving the exhaust effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 This is a cross-sectional view of a hydrogen fuel cell exhaust muffler according to an embodiment of the present utility model;

[0018] Figure 2 It is a structural schematic diagram of a hydrogen fuel cell exhaust muffler according to an embodiment of the present utility model.

[0019] In the figure, 1. cylinder; 11. partition; 12. main body; 13. air inlet end cover; 14. air outlet end cover; 100. silencer chamber; 2. silencer pipe; 20. silencer hole; 21. main pipe; 22. air inlet pipe; 23. air outlet pipe; 200. first inlet; 210. first outlet; 3. connecting pipe; 31. straight pipe section; 311. second outlet; 32. bent pipe section; 321. second inlet; 322. snap-on boss; 4. one-way valve; 5. drain pipe; 6. filter; 7. fixing bracket; 71. mounting hole. DETAILED DESCRIPTION

[0020] The following embodiments are used to illustrate the present invention, but are not intended to limit the scope of the present invention.

[0021] In the description of the present invention, it should be understood that the terms "upper", "lower", "front", "back", "inside", "outside", etc. used in the present invention to indicate the orientation or position relationship are based on the position relationship shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the devices and elements referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0022] In the description of this utility model, it should be understood that the terms "first," "second," etc. are used to describe various types of information, but such information should not be limited to these terms. These terms are merely used to distinguish information of the same type from one another. For example, "first" information may also be referred to as "second" information, and similarly, "second" information may also be referred to as "first" information without departing from the scope of this utility model.

[0023] like Figure 1 As shown, a hydrogen fuel cell exhaust muffler of a preferred embodiment of the present invention can integrate a purge pipe, which includes a cylinder 1, a muffler pipe 2, a connecting pipe 3, and a one-way valve 4; specifically, refer to Figure 2 The cylinder 1 and the muffler 2 are coaxially arranged. The muffler 2 passes through the cylinder 1 and is provided with a first inlet 200 at one end and a first outlet 210 at the other end. That is, the exhaust gas enters the muffler 2 from the first inlet 200 for muffler treatment and is then discharged from the first outlet 210. In order to facilitate the integration of the purge pipe, in this utility model, refer to Figure 2The connecting pipe 3 includes a straight pipe section 31 and a bent pipe section 32. Specifically, the straight pipe section 31 is arranged in the silencer 2 and along the axial direction of the silencer 2. The end of the straight pipe section 31 is provided with a second outlet 311, and the second outlet 311 is arranged close to the first outlet 210. The other end of the straight pipe section 31 is connected to the bent pipe section, and the other end of the bent pipe section passes through the silencer 2 and extends to the outside of the silencer 2 and is provided with a second inlet 321. The second inlet 321 is provided with a one-way valve 4 for connecting to the purge pipe. That is, when the purge pipe is connected for purge, the exhaust gas flows into the connecting pipe 3 from the second inlet 321 and is discharged from the second outlet 311. The exhaust gas in the muffler 2 flows into the first inlet 200 and is discharged from the first outlet 210. The flow directions of the exhaust gases in the two are consistent when they are discharged, avoiding mutual interference when the exhaust gases are discharged. At the same time, a one-way valve 4 is set, and the exhaust gas can only flow from the second inlet 321 to the second outlet 311, which can prevent the exhaust gas from flowing back into the purge pipe, avoid the formation of exhaust gas backflow in the purge pipe, and improve the exhaust effect. The arrows in the figure indicate the exhaust gas flow path.

[0024] Further, in order to facilitate the arrangement of the straight pipe section 31 and the bent pipe section 32, refer to Figure 1 The axis of the straight pipe section 31 and the axis of the bent pipe section are arranged at a preset angle α, which ranges from 100° to 150° and can be adjusted according to the actual installation requirements of the purge pipe. In this embodiment, the muffler pipe 2 and the connecting pipe 3 are directly fixed by welding, that is, the outer wall of the bent pipe section 32 is welded to the inner wall and outer wall of the muffler pipe 2. Furthermore, to facilitate the connection between the bent pipe section and the one-way valve, the inner wall of the bent pipe section 32 near the second inlet 321 is provided with an internal thread. At the same time, the outer wall of the bent pipe section 32 near the second inlet 321 is provided with a snap-on boss 322, which can be used to connect directly to the purge pipe or to connect to the one-way valve 4 through a pipeline.

[0025] Furthermore, in order to facilitate the design of the muffler pipe 2, in this embodiment, refer to Figure 1 The muffler pipe 2 includes a main pipe 21, an air inlet pipe 22, and an air outlet pipe 23. The main pipe 21 is provided with an air inlet pipe 22 at one end and an air outlet pipe 23 at the other end. A first inlet 200 is provided at the end of the air inlet pipe 22 away from the main pipe 21, and a first outlet 210 is provided at the end of the air outlet pipe 23 away from the main pipe 21. Furthermore, in order to enhance the muffler effect, in this embodiment, a plurality of partitions 11 are evenly distributed along the axial direction within the cylinder 1. The plurality of partitions 11 and the muffler pipe 2 axially divide the interior of the cylinder 1 into a plurality of muffler chambers 100. The wall of the muffler pipe 2 located in the muffler chamber 100 is provided with muffler holes 20 for eliminating low, medium, and high-frequency noise in the exhaust gas.

[0026] Furthermore, some water vapor in the exhaust gas is easy to gather on the inner wall of the cylinder 1 to form water droplets after being cooled. In order to facilitate drainage, refer to Figure 1 、 Figure 2 The side wall of the cylinder 1 is provided with a drain pipe 5 connected to the interior of the cylinder 1 near the first inlet 200. Furthermore, in order to facilitate the processing of the cylinder 1 and reduce the processing difficulty of the cylinder 1, in this embodiment, refer to Figure 2 The cylinder 1 includes a main body 12, an air inlet end cover 13, and an air outlet end cover 14. The air inlet end cover 13 is provided at one end of the main body 12, and the air outlet end cover 14 is provided at the other end of the main body 12. Both the air inlet end cover 13 and the air outlet end cover 14 are provided with through holes for the muffler pipe 2 to pass through.

[0027] Furthermore, in order to prevent external impurities from entering the muffler through the first outlet 210 and affecting the exhaust effect of the muffler, a filter 6 is provided at the first outlet 210. Furthermore, in order to facilitate the installation and fixation of the muffler as a whole, refer to Figure 2 A fixing bracket 7 is provided at intervals along the axial direction on the outside of the cylinder 1. The fixing bracket 7 has a mounting hole 71 for connecting with the outside, and a screw can be set in the mounting hole 71 to fix it to the outside.

[0028] In summary, the embodiment of the present invention provides a hydrogen fuel cell exhaust silencer, wherein the connecting pipe 3 includes a straight pipe section 31 and a bent pipe section 32. The straight pipe section 31 is arranged in the silencer pipe 2 and is arranged along the axial direction of the silencer pipe 2. The second outlet 311 is arranged near the first outlet 210. The other end of the bent pipe section passes through the silencer pipe 2 and extends to the outside of the silencer pipe 2. A second inlet 321 is provided. The second inlet 321 is provided with a one-way valve 4. The purge pipe can be integrated into the connecting pipe 3 to improve the integration of the exhaust pipeline. In addition, the purge pipe is connected to the one-way valve 4. The exhaust gas flows into the connecting pipe 3 from the second inlet 321 and is discharged from the second outlet 311. The exhaust gas in the silencer pipe 2 flows into the first inlet 200 and is discharged from the first outlet 210. When the muffler and the purge pipe are exhausted, the exhaust gas discharges in the same flow direction, avoiding mutual interference when the exhaust gas is discharged. At the same time, the one-way valve 4 is provided to prevent the exhaust gas from flowing back into the purge pipe, avoiding the formation of exhaust gas backflow in the purge pipe, and improving the exhaust effect.

[0029] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and replacements can be made without departing from the technical principles of the present invention. These improvements and replacements should also be regarded as the scope of protection of the present invention.

Claims

1. A hydrogen fuel cell exhaust muffler, characterized by: It includes a cylinder, a muffler pipe, connecting pipes, and a one-way valve; The muffler pipe passes through the cylinder and is provided with a first inlet at one end and a first outlet at the other end; The connecting pipe includes a straight pipe section and a bent pipe section. The straight pipe section is arranged in the silencer pipe and along the axial direction of the silencer pipe. The end of the straight pipe section is provided with a second outlet, and the second outlet is arranged close to the first outlet. The other end of the straight pipe section is connected to the bent pipe section, and the other end of the bent pipe section passes through the silencer pipe and extends to the outside of the silencer pipe to be provided with a second inlet. The second inlet is provided with a one-way valve for connecting to the purge pipe.

2. The hydrogen fuel cell exhaust muffler according to claim 1, characterized in that: The axis of the straight pipe section and the axis of the bent pipe section are arranged at a preset angle α, and the value range of the preset angle α is 100°-150°.

3. The hydrogen fuel cell exhaust muffler according to claim 1, wherein: The muffler pipe includes a main pipe, an air inlet pipe and an air outlet pipe. The air inlet pipe is provided at one end of the main pipe and the air outlet pipe is provided at the other end. The first inlet is provided at the end of the air inlet pipe away from the main pipe, and the first outlet is provided at the end of the air outlet pipe away from the main pipe.

4. The hydrogen fuel cell exhaust muffler according to claim 1, wherein: A plurality of partitions are evenly distributed in the cylinder along the axial direction. The plurality of partitions and the muffler pipe divide the interior of the cylinder along the axial direction to form a plurality of muffler cavities. The muffler pipe is provided with muffler holes on the wall of the pipe section located in the muffler cavity.

5. The hydrogen fuel cell exhaust muffler according to claim 1, characterized in that: A drainage pipe communicating with the interior of the cylinder is provided on the side wall of the cylinder near the first inlet.

6. The hydrogen fuel cell exhaust muffler according to claim 1, wherein: The cylinder includes a main body, an air inlet end cover, and an air outlet end cover. The air inlet end cover is provided at one end of the main body, and the air outlet end cover is provided at the other end of the main body. Both the air inlet end cover and the air outlet end cover are provided with a through hole for the muffler to pass through.

7. The hydrogen fuel cell exhaust muffler according to claim 1, wherein: A filter is provided at the first outlet.

8. The hydrogen fuel cell exhaust muffler according to claim 1, wherein: The outer side of the cylinder is provided with fixing brackets at intervals along the axial direction, and the fixing brackets are provided with mounting holes for connecting with the outside.

9. The hydrogen fuel cell exhaust muffler according to claim 1, characterized in that: An inner wall of one end of the bent pipe section close to the second inlet is provided with an internal thread, and an outer wall of one end of the bent pipe section close to the second inlet is provided with a clamping boss.

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