Dendritic flow channel structure

Abstract

The present application relates to fuel cell technology field, it is a kind of dendritic flow passage structure, including shell, primary separator, secondary separator and tertiary separator, closed mounting cavity is equipped in shell, outlet is equipped in shell upper side with the upper portion of mounting cavity intercommunication, inlet is equipped in shell lower side with the lower portion of mounting cavity intercommunication.The present application is reasonable and compact in structure, inlet is small flow channel, after gas flow into mouth, with flow, small flow channel gradually carries out merging, finally converges into relatively larger flow channel in the outlet of end and flows out.The gas of the present application enters when, it will be under the action of pressure, symmetrically flows into flow passage two ends, is forced to pass through porous gas diffusion layer, after reaction, enters gas outlet branch flow passage, then two branches converge into wider flow channel and flow out, the dendritic flow passage structure can make gas flow through flow passage evenly, make pressure distribution uniform in flow passage, improve fuel cell battery performance.

Description

Technical Field

[0001] This invention relates to the field of fuel cell technology and is a dendritic flow channel structure. Background Technology

[0002] As a key component of fuel cells, the flow channels connecting the inlet and outlet primarily function to conduct electrons and distribute electrolyte to the electrodes. A better flow field can enhance mass transfer and improve fuel cell performance. Therefore, optimizing the flow field structure of fuel cells is of great significance for enhancing fuel cell performance and promoting their commercialization.

[0003] In fuel cell technology, common flow channel structures include serpentine channels, parallel channels, interdigitated channels, and needle channels. Parallel channels offer advantages such as simple structure, low pressure drop, and uniform gas distribution, but their performance can deteriorate at lower inlet pressures. Serpentine channels have gained widespread commercial application due to their excellent water management performance, but they also lead to uneven distribution of gaseous reactants and excessive pressure drop. Interdigitated channels offer good cell performance, but their extremely high pressure drop significantly increases the pumping power of gaseous reactants, reducing output power. Needle channels have very low pressure drop, but their uneven reactant distribution results in uneven pressure distribution, leading to low fuel cell performance. Summary of the Invention

[0004] This invention provides a dendritic flow channel structure that overcomes the shortcomings of the prior art and can effectively solve the problems of uneven pressure distribution and low fuel cell performance in existing fuel cell flow channels.

[0005] The technical solution of the present invention is achieved through the following measures: a dendritic flow channel structure, including a shell, a primary baffle, a secondary baffle, and a tertiary baffle. The shell has a closed mounting cavity. The upper side of the shell has an outlet communicating with the upper part of the mounting cavity, and the lower side of the shell has an inlet communicating with the lower part of the mounting cavity. Several primary baffles are arranged at intervals on the left and right sides in the mounting cavity. A secondary baffle is arranged to the left of the leftmost primary baffle, to the right of the rightmost primary baffle, and between each pair of adjacent primary baffles. The upper side of each secondary baffle is located below the upper side of the primary baffle. A tertiary baffle is arranged to the lower left of the leftmost secondary baffle, to the lower right of the rightmost secondary baffle, and between adjacent primary and secondary baffles. The upper side of each tertiary baffle is located below the upper side of the secondary baffle. The lower sides of the primary baffle, the secondary baffle, and the tertiary baffle are flush.

[0006] The following are further optimizations and / or improvements to the above-mentioned technical solution:

[0007] A first flow channel can be formed between the three-stage partition and the adjacent first-stage partition, and between the leftmost third-stage partition and the lower left side wall of the mounting cavity. A second flow channel can be formed between the three-stage partition and the adjacent second-stage partition, and between the rightmost third-stage partition and the lower right side wall of the mounting cavity. A third flow channel can be formed between the second-stage partition and the adjacent first-stage partition, and between the second-stage partition and the middle inner wall of the mounting cavity. The lower end of the third flow channel is connected to the upper end of the corresponding first flow channel and the upper end of the corresponding second flow channel. A fourth flow channel is formed between two adjacent first-stage partitions and between the first-stage partition and the upper inner wall of the mounting cavity. The lower end of the fourth flow channel is connected to the upper part of the corresponding third flow channel.

[0008] A first guide cone can be fixed on the upper side of the aforementioned secondary baffle. The width of the first guide cone gradually narrows from bottom to top. The lower left inner wall of the fourth flow channel corresponding to the left position of the first guide cone and the upper left inner wall of the third flow channel are inclined to transition. The lower right inner wall of the fourth flow channel corresponding to the right position of the first guide cone and the upper right inner wall of the third flow channel are inclined to transition. A second guide cone is fixed on the upper side of the tertiary baffle. The width of the second guide cone gradually narrows from bottom to top. The lower inner wall of the third flow channel corresponding to the position of the second guide cone and the upper inner wall of the first or second flow channel are inclined to transition.

[0009] The width of the first flow channel and the width of the second flow channel can be the same, the width of the third flow channel is greater than or equal to the width of the first flow channel, and the width of the third flow channel is less than or equal to the width of the fourth flow channel.

[0010] The number of the aforementioned primary partitions can be an odd number greater than 3, with the middle primary partition corresponding to the entrance.

[0011] The aforementioned housing may include a base plate and a cover plate. The front side of the base plate is provided with a mounting groove that opens forward. The lower side of the middle of the base plate is provided with a lower groove that runs vertically through the base and opens forward. The upper side of the middle of the base plate, corresponding to the position of the lower groove, is provided with an upper groove that runs vertically through the base and opens forward. A cover plate is fixedly installed on the front side of the base plate. The lower rear side of the cover plate forms an inlet with the lower groove, the upper rear side of the cover plate forms an outlet with the upper groove, and the middle rear side of the cover plate forms a mounting cavity with the mounting groove.

[0012] The front side of the aforementioned middle primary partition can be V-shaped with an opening facing backwards. The rear side of the cover plate and the front side of the bottom plate are both V-shaped with openings facing backwards. The front side of the primary partition to the left of the middle primary partition is a sloped surface with the right side inclined forward relative to the left side. The front side of the primary partition to the right of the middle primary partition is a sloped surface with the left side inclined forward relative to the right side. The rear side of the middle of the cover plate is in contact with the front side of each primary partition.

[0013] The lower inner wall of the aforementioned mounting groove may be V-shaped with the opening facing upwards. The center of the lower part of the mounting groove is connected to the upper part of the lower groove. The upper inner wall of the mounting groove is V-shaped with the opening facing downwards. The center of the upper part of the mounting groove is connected to the lower part of the upper groove. Chamfered structures are provided on the inner rear part of the mounting groove, the inner rear part of the lower groove, the inner rear part of the upper groove, the inner rear part of the first flow channel, the inner rear part of the second flow channel, the inner rear part of the third flow channel, and the inner rear part of the fourth flow channel.

[0014] This invention features a rational and compact structure. The inlet is a narrow flow channel. As gas flows in, these narrow channels gradually merge, eventually forming a larger flow channel that exits at the outlet. When gas enters through the inlet, it flows symmetrically to both ends of the channel under pressure, forced through a porous gas diffusion layer, reacts, and enters the outlet branch channel. Subsequently, the two branches merge into a wider flow channel. This dendritic flow channel structure allows gas to flow evenly through the channel, resulting in uniform pressure distribution and improved fuel cell performance. Attached Figure Description

[0015] Appendix Figure 1 The diagram shows the main view of the structure of Embodiments 1 to 8 of the present invention with the cover plate removed.

[0016] Appendix Figure 2 For the appendix Figure 1 A magnified structural diagram of point A in the middle.

[0017] Appendix Figure 3 The diagram shows the top view of the structure in embodiments one through eight of the present invention.

[0018] Appendix Figure 4 These are bottom-view sectional structural diagrams of embodiments one through eight of the present invention.

[0019] Appendix Figure 5 For the appendix Figure 4 A magnified structural diagram at point B in the middle.

[0020] Appendix Figure 6 This is a schematic diagram of the velocity distribution of the preferred embodiment of the present invention when the H2 inlet velocity is a set value.

[0021] Appendix Figure 7 This is a schematic diagram of the velocity distribution of the serpentine flow channel when the inlet velocity of H2 is a set value.

[0022] Appendix Figure 8 This is a schematic diagram of the pressure distribution in the preferred embodiment of the present invention when the H2 inlet flow rate is a set value.

[0023] Appendix Figure 9 This is a schematic diagram of the pressure distribution in the serpentine flow channel when the inlet velocity of H2 is a set value.

[0024] Appendix Figure 10This is a schematic diagram of the velocity distribution of the preferred embodiment of the present invention when the H2O inlet flow rate is a set value.

[0025] Appendix Figure 11 This is a schematic diagram of the velocity distribution in the serpentine flow channel when the H2O inlet velocity is a set value.

[0026] Appendix Figure 12 This is a schematic diagram of the pressure distribution in the preferred embodiment of the present invention when the H2O inlet flow rate is a set value.

[0027] Appendix Figure 13 This is a schematic diagram of the pressure distribution in the serpentine flow channel when the H2O inlet velocity is a set value.

[0028] The codes in the attached diagram are as follows: 1 is the primary baffle, 2 is the secondary baffle, 3 is the tertiary baffle, 4 is the first flow channel, 5 is the second flow channel, 6 is the third flow channel, 7 is the fourth flow channel, 8 is the lower groove, 9 is the upper groove, 10 is the first guide cone, 11 is the second guide cone, 12 is the mounting groove, 13 is the base plate, 14 is the cover plate, 15 is the chamfered structure, and 16 is the guide groove. Detailed Implementation

[0029] The present invention is not limited to the following embodiments, and the specific implementation can be determined according to the technical solution of the present invention and the actual situation.

[0030] In this invention, for ease of description, the description of the relative positions of the components is based on the appendix to the specification. Figure 1 The layout is described using a diagrammatic method, such as the positional relationships of front, back, top, bottom, left, and right, which are based on the instructions attached. Figure 1 The orientation of the layout is determined by the direction of the map.

[0031] The present invention will be further described below with reference to embodiments and accompanying drawings:

[0032] Example 1: As shown in the attached document Figures 1 to 5 As shown, the dendritic flow channel structure includes a shell, a primary baffle 1, a secondary baffle 2, and a tertiary baffle 3. The shell has a closed mounting cavity. The upper side of the shell has an outlet communicating with the upper part of the mounting cavity, and the lower side of the shell has an inlet communicating with the lower part of the mounting cavity. Several primary baffles 1 are arranged at intervals on the left and right sides in the mounting cavity. A secondary baffle 2 is arranged to the left of the leftmost primary baffle 1, to the right of the rightmost primary baffle 1, and between each pair of adjacent primary baffles 1. The upper side of each secondary baffle 2 is located below the upper side of the primary baffle 1. A tertiary baffle 3 is arranged to the lower left of the leftmost secondary baffle 2, to the lower right of the rightmost secondary baffle 2, and between adjacent primary baffles 1 and secondary baffles 2. The upper side of each tertiary baffle 3 is located below the upper side of the secondary baffle 2. The lower sides of the primary baffle 1, the secondary baffle 2, and the tertiary baffle 3 are flush.

[0033] The upper side of each secondary partition 2 is located below the upper side of the primary partition 1, and the upper side of each tertiary partition 3 is located below the upper side of the secondary partition 2. That is, the upper sides of the primary partition 1 (the thickest upper surface), the secondary partition 2 (the thickest upper surface), and the tertiary partition 3 (the thickest upper surface) are staggered from top to bottom. During operation, the inlet is a narrow flow channel. After the gas flows into the inlet, the narrow channels gradually merge, eventually converging into a larger flow channel that exits at the outlet. When the gas enters from the inlet, it flows under pressure to both ends of the flow channel, is forced through the porous gas diffusion layer, reacts, and enters the outlet branch flow channel. Subsequently, the two branches merge into a wider flow channel. This dendritic flow channel structure allows the gas to flow evenly through the flow channel, resulting in uniform pressure distribution within the flow channel and improving the fuel cell's performance.

[0034] The above-mentioned dendritic flow channel structure can be further optimized and / or improved according to actual needs:

[0035] Example 2: As an optimization of the above examples, as shown in the appendix. Figure 1 , 2 As shown, a first flow channel 4 is formed between the third-level partition 3 and the adjacent first-level partition 1, and between the leftmost third-level partition 3 and the lower left side wall of the mounting cavity. A second flow channel 5 is formed between the third-level partition 3 and the adjacent second-level partition 2, and between the rightmost third-level partition 3 and the lower right side wall of the mounting cavity. A third flow channel 6 is formed between the second-level partition 2 and the adjacent first-level partition 1, and between the second-level partition 2 and the middle inner wall of the mounting cavity. The lower end of the third flow channel 6 is connected to the upper end of the corresponding first flow channel 4 and the upper end of the corresponding second flow channel 5. A fourth flow channel 7 is formed between two adjacent first-level partitions 1 and between the first-level partition 1 and the upper inner wall of the mounting cavity. The lower end of the fourth flow channel 7 is connected to the upper part of the corresponding third flow channel 6.

[0036] During use, this setup allows the gas to reach all areas of the flow field simultaneously, resulting in a very uniform distribution of the reactive gas on the electrode surface. This leads to a uniform current density distribution, avoids local hot spots, and reduces the pressure drop during gas flow.

[0037] Example 3: As an optimization of the above examples, as shown in the appendix. Figure 1 , 2As shown, a first guide cone 10 is fixed on the upper side of the secondary baffle 2. The width of the first guide cone 10 gradually narrows from bottom to top. The lower left inner wall of the fourth channel 7 and the upper left inner wall of the third channel 6 are inclined to transition to each other. The lower right inner wall of the fourth channel 7 and the upper right inner wall of the third channel 6 are inclined to transition to each other. A second guide cone 11 is fixed on the upper side of the tertiary baffle 3. The width of the second guide cone 11 gradually narrows from bottom to top. The lower inner wall of the third channel 6 and the upper inner wall of the first channel 4 or the second channel 5 are inclined to transition to each other.

[0038] As required, both the upper end of the first guide cone 10 and the lower end of the second guide cone 11 are provided with rounded chamfers. During use, by setting the first guide cone 10 and the second guide cone 11, the mutual impact of fluids during gas merging can be reduced to form stagnation points (points with zero velocity), which would lead to local kinetic energy loss. It can also prevent the formation of eddies or low-speed zones behind the merging point, thus avoiding phenomena that are detrimental to gas renewal and liquid water discharge.

[0039] Example 4: As an optimization of the above examples, as shown in the appendix. Figure 1 , 2 As shown in Figures 4 and 5, the width of the first flow channel 4 is the same as the width of the second flow channel 5, the width of the third flow channel 6 is greater than or equal to the width of the first flow channel 4, and the width of the third flow channel 6 is less than or equal to the width of the fourth flow channel 7.

[0040] Depending on the requirements, the width of the third flow channel 6 is 1 to 2 times the width of the first flow channel 4, and the width of the fourth flow channel 7 is 1 to 2 times the width of the third flow channel 6.

[0041] Example 5: As an optimization of the above examples, as shown in the appendix. Figure 1 , 4 As shown, the number of primary partitions 1 is an odd number greater than 3, and the primary partition 1 located in the middle corresponds to the entrance.

[0042] The first flow channel 4 and the second flow channel 5 are primary flow channels, the third flow channel 6 is a secondary flow channel, and the fourth flow channel 7 is a tertiary flow channel. The ratio of the number of primary flow channels to the number of secondary flow channels to the number of tertiary flow channels is 4:2:1. During use, the number of primary baffles 1 is an odd number greater than 3. The primary baffle 1 located in the middle corresponds to the inlet. In this way, when gas enters the installation cavity from the lower inlet, the primary baffle 1 in the middle can divert the gas.

[0043] When gas enters through the inlet, it is split and flows into the primary flow channel. Then, adjacent primary flow channels merge to form the secondary flow channel. At the end of the secondary flow channel, adjacent secondary flow channels merge to form the tertiary flow channel. When gas flows out of the tertiary flow channel, it is collected and flows out through the outlet.

[0044] Example 6: As an optimization of the above examples, as shown in the appendix Figure 1 , 3 As shown in Figures 4 and 5, the housing includes a base plate 13 and a cover plate 14. The front side of the base plate 13 is provided with a mounting groove 12 that opens forward. The lower side of the middle part of the base plate 13 is provided with a lower groove 8 that runs vertically through and opens forward. The upper side of the middle part of the base plate 13, corresponding to the position of the lower groove 8, is provided with an upper groove 9 that runs vertically through and opens forward. The cover plate 14 is fixedly installed on the front side of the base plate 13. The lower rear side of the cover plate 14 forms an inlet with the lower groove 8, the upper rear side of the cover plate 14 forms an outlet with the upper groove 9, and the middle rear side of the cover plate 14 forms a mounting cavity with the mounting groove 12.

[0045] Depending on the requirements, the base plate 13 and the cover plate 14 are fixed together by four connecting bolts spaced circumferentially. A sealing strip can be provided between the base plate 13 and the cover plate 14 to improve the sealing effect. During use, this arrangement facilitates the processing and manufacturing of the housing, as well as the processing of the first flow channel 4, the second flow channel 5, the third flow channel 6, and the fourth flow channel 7.

[0046] Example 7: As an optimization of the above embodiments, as shown in the appendix Figure 3 , 4 As shown in Figure 5, the front side of the middle primary partition 1 is V-shaped with an opening facing backward. The rear side of the cover plate 14 and the front side of the bottom plate 13 are both V-shaped with openings facing backward. The front side of the primary partition 1 to the left of the middle primary partition 1 is a sloped surface with the right side inclined forward relative to the left side. The front side of the primary partition 1 to the right of the middle primary partition 1 is a sloped surface with the left side inclined forward relative to the right side. The rear side of the middle of the cover plate 14 is in contact with the front side of each primary partition 1.

[0047] The left and right cross sections of the middle primary baffle 1 are symmetrical right trapezoids. The left and right primary baffles 1 are symmetrically arranged. The left and right secondary baffles 2 and tertiary baffles 3 are symmetrically arranged. The front sides of all the primary baffles 1 to the left of the middle primary baffle 1 are coplanar with the front side of the left portion of the middle primary baffle 1. The front sides of all the primary baffles 1 to the right of the middle primary baffle 1 are coplanar with the front side of the right portion of the middle primary baffle 1. The flow channel is designed as a dendritic flow channel structure with symmetrical slope, which can effectively improve the uniformity of gas and liquid water distribution in the flow channel and is beneficial to the improvement of fuel cell performance.

[0048] Both the base plate 13 and the cover plate 14 are rectangular. Using the central axis running vertically along the front side of the base plate 13 as the axis of symmetry, two inclined planes with the same slope are formed at predetermined heights on the left and right sides of the base plate 13. Using a cutting process, the portion of the base plate 13 and the partition plate above the inclined planes is removed, resulting in a symmetrical flow channel structure. The cover plate 14 is processed in the same way as the base plate 13. This results in a flow channel cross-sectional area that gradually decreases from the center to both sides, meaning the flow channel height gradually decreases from the central axis to both ends, creating a flow field structure with a symmetrical slope. Because the height at the left and right ends is lower than that at the central axis, the pressure in the flow channels at the left and right ends is higher than that at the axis of symmetry. When gas flows in from the inlet, it flows towards the flow channels at the left and right ends under pressure, and then flows evenly into the dendritic flow channel, improving the uniformity of gas flow in the channel.

[0049] Example 8: As an optimization of the above examples, as shown in the appendix Figure 1 , 3 As shown in Figures 4 and 5, the lower inner wall of the mounting groove 12 is V-shaped with the opening facing upwards. The lower center of the mounting groove 12 is connected to the upper part of the lower groove 8. The upper inner wall of the mounting groove 12 is V-shaped with the opening facing downwards. The upper center of the mounting groove 12 is connected to the lower part of the upper groove 9. The rear inner side of the mounting groove 12, the rear inner side of the lower groove 8, the rear inner side of the upper groove 9, the rear inner side of the first flow channel 4, the rear inner side of the second flow channel 5, the rear inner side of the third flow channel 6, and the rear inner side of the fourth flow channel 7 are all provided with chamfered structures 15.

[0050] Chamfered structures 15 are provided on the inner rear sides of the mounting groove 12, the lower groove 8, the upper groove 9, the first flow channel 4, the second flow channel 5, the third flow channel 6, and the fourth flow channel 7. These chamfered structures 15 form guide channels 16. When gas flows in from the inlet, a portion of the gas flows with the guide channels 16 and enters the fine branches of the dendritic flow field, thereby improving the uniformity of gas flow within the flow channels and enhancing the battery performance of the fuel cell.

[0051] The above technical features constitute various embodiments of the present invention, which have strong adaptability and implementation effect. Unnecessary technical features can be added or removed according to actual needs to meet the needs of different situations.

[0052] The testing process of the preferred embodiment of the present invention:

[0053] Step 1: Mesh the dendritic flow channel structure: Import the designed dendritic flow channel structure into the Fluent module of Ansys software, adjust the mesh size, and then mesh the dendritic flow channel structure.

[0054] Step 2: Simulate the flow field performance of the dendritic channel structure: Based on the mesh generated in Step 2, simulate the flow field performance of the dendritic channel structure. Set the inlet velocity to a set value, and use H2 and H2O as fluids. At the same time, import the traditional serpentine channel structure into the Fluent module of Ansys software, use the same fluid and velocity, and perform simulation for performance comparison.

[0055] Step 3: Analyze the simulation data of the dendritic flow channel structure: The fluid velocity and pressure distribution cloud maps of the dendritic flow channel structure and the traditional serpentine flow channel structure are shown below, with the flow velocity set at a predetermined value and the fluids being H2 and H2O respectively. Figures 6 to 13 As shown in the figure, the upper left of the traditional serpentine flow channel is the inlet and the lower right is the outlet; the lower part of the tree-shaped flow channel structure is the inlet and the upper part is the outlet.

[0056] Figure 6 and Figure 7 The diagrams show the velocity distribution of the dendritic flow channel structure and the velocity distribution of the conventional fuel cell serpentine flow channel, respectively, when the H2 inlet velocity is set to a certain value. Higher color consistency in the velocity cloud map indicates a more uniform velocity distribution of H2 within the fuel cell flow channel. It can be seen that the velocity cloud map of the dendritic flow channel structure has higher color consistency than that of the conventional fuel cell serpentine flow channel, indicating a significant improvement in the uniformity of H2 gas distribution.

[0057] Figure 8 and Figure 9 The diagrams show the velocity distribution of the dendritic channel structure and the pressure distribution of a conventional fuel cell serpentine channel for comparison, with the H2 inlet velocity set to a predetermined value. Darker colors in the pressure cloud map indicate higher gas pressure. Comparing the dendritic channel structure and the conventional fuel cell serpentine channel, it is found that the dendritic channel structure only exhibits higher gas pressure at the outlet / inlet due to higher gas velocities. The pressure cloud map of the middle section of the dendritic channel is lighter in color and shows better color consistency, indicating that the pressure within the dendritic channel with its symmetrical slope and guide groove 16 is more uniform, and that the gas flow within the dendritic channel with its symmetrical slope and guide groove 16 is more stable.

[0058] Figure 10 and Figure 11 The diagrams show the velocity distribution of the dendritic flow channel structure and the velocity distribution of the serpentine flow channel in a conventional fuel cell when the H2O inlet velocity is set.

[0059] Figure 12 and Figure 13The diagrams show the velocity distribution of the dendritic channel structure and the pressure distribution of the conventional fuel cell serpentine channel, respectively, when the H2O inlet flow rate is set. It can be seen that, compared to the conventional fuel cell serpentine channel, the velocity cloud map of the dendritic channel structure has better color consistency, while the pressure cloud map is lighter and more uniform in color. This indicates that the dendritic channel structure allows for interconnection between channels, facilitating the rapid discharge of reaction product water from the bipolar plates and preventing flooding that could affect fuel cell performance.

[0060] In summary, the dendritic flow channel structure can achieve a more uniform distribution of reactant gases and superior drainage performance.

Claims

1. A dendritic flow channel structure, characterized in that... It includes a shell, a primary partition, a secondary partition, and a tertiary partition. The shell has a closed mounting cavity. The upper side of the shell has an outlet communicating with the upper part of the mounting cavity, and the lower side of the shell has an inlet communicating with the lower part of the mounting cavity. Several primary partitions are arranged at intervals on the left and right sides of the mounting cavity. A secondary partition is arranged to the left of the leftmost primary partition, to the right of the rightmost primary partition, and between each pair of adjacent primary partitions. The upper side of each secondary partition is located below the upper side of the primary partition. A tertiary partition is arranged to the lower left of the leftmost secondary partition, to the lower right of the rightmost secondary partition, and between adjacent primary and secondary partitions. The upper side of each tertiary partition is located below the upper side of the secondary partition. The lower sides of the primary, secondary, and tertiary partitions are flush. A first flow channel is formed between the third-level partition and the adjacent first-level partition, and between the leftmost third-level partition and the lower left side wall of the mounting cavity. A second flow channel is formed between the third-level partition and the adjacent second-level partition, and between the rightmost third-level partition and the lower right side wall of the mounting cavity. A third flow channel is formed between the second-level partition and the adjacent first-level partition, and between the second-level partition and the middle inner wall of the mounting cavity. The lower end of the third flow channel is connected to the upper end of the corresponding first flow channel and the upper end of the corresponding second flow channel. A fourth flow channel is formed between two adjacent first-level partitions and between the first-level partition and the upper inner wall of the mounting cavity. The lower end of the fourth flow channel is connected to the upper part of the corresponding third flow channel. A first guide cone is fixed on the upper side of the secondary baffle. The width of the first guide cone gradually narrows from bottom to top. The lower left inner wall of the fourth channel corresponding to the left position of the first guide cone and the upper left inner wall of the third channel are inclined to transition. The lower right inner wall of the fourth channel corresponding to the right position of the first guide cone and the upper right inner wall of the third channel are inclined to transition. A second guide cone is fixed on the upper side of the tertiary baffle. The width of the second guide cone gradually narrows from bottom to top. The lower inner wall of the third channel corresponding to the position of the second guide cone and the upper inner wall of the first channel or the second channel are inclined to transition. The width of the first flow channel is the same as the width of the second flow channel, the width of the third flow channel is greater than or equal to the width of the first flow channel, and the width of the third flow channel is less than or equal to the width of the fourth flow channel. The number of primary partitions is an odd number greater than 3, with the middle primary partition corresponding to the entrance.

2. The dendritic flow channel structure according to claim 1, characterized in that... The housing includes a base plate and a cover plate. The front side of the base plate has a mounting groove with an opening facing forward. The lower side of the middle of the base plate has a lower groove that runs vertically through and opens forward. The upper side of the middle of the base plate, corresponding to the position of the lower groove, has an upper groove that runs vertically through and opens forward. The cover plate is fixedly installed on the front side of the base plate. The lower rear side of the cover plate forms an inlet with the lower groove, the upper rear side of the cover plate forms an outlet with the upper groove, and the middle rear side of the cover plate forms a mounting cavity with the mounting groove.

3. The dendritic flow channel structure according to claim 2, characterized in that... The front side of the middle primary partition is V-shaped with an opening facing backwards. The rear side of the cover plate and the front side of the bottom plate are also V-shaped with openings facing backwards. The front side of the primary partition to the left of the middle primary partition is a sloped surface with the right side inclined forward relative to the left side. The front side of the primary partition to the right of the middle primary partition is a sloped surface with the left side inclined forward relative to the right side. The rear side of the middle of the cover plate is in contact with the front side of each primary partition.

4. The dendritic flow channel structure according to claim 3, characterized in that... The lower inner wall of the mounting groove is V-shaped with the opening facing upwards. The center of the lower part of the mounting groove is connected to the upper part of the lower groove. The upper inner wall of the mounting groove is V-shaped with the opening facing downwards. The center of the upper part of the mounting groove is connected to the lower part of the upper groove. The rear inner sides of the mounting groove, the lower groove, the upper groove, the first flow channel, the second flow channel, the third flow channel, and the fourth flow channel are all provided with chamfered structures.

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