A unidirectional multi-branch parallel pipeline structure and its application

Abstract

The present invention provides a unidirectional multi-branch parallel pipeline structure and its application. The structure includes a first-stage pipe and a second-stage pipe connected in sequence; the second-stage pipe includes at least six independently arranged first branch pipes, second branch pipes, third branch pipes, fourth branch pipes, fifth branch pipes and sixth branch pipes with the same pipe diameter; the first branch pipe, the second branch pipe, the third branch pipe, the fourth branch pipe, the fifth branch pipe and the sixth branch pipe are respectively communicated with the first-stage pipe, and the height of the inlet of the first branch pipe > the height of the inlet of the second branch pipe > the height of the inlet of the third branch pipe > the height of the inlet of the fourth branch pipe > the height of the inlet of the fifth branch pipe > the height of the inlet of the sixth branch pipe; a first fillet is arranged on the outer side of the connection between the first-stage pipe and the first branch pipe, and a second fillet is arranged on the outer side of the connection between the first-stage pipe and the sixth branch pipe. Through the present application, the flow distribution of the fuel cell system is made uniform and the performance is stable.

Description

Technical Field

[0001] The present invention relates to the technical field of fuel cells, and particularly to a one-way multi-branch parallel pipeline structure and its application. Background Art

[0002] Facing the increasingly strict exhaust emission standards in China and even the world today and the future energy crisis, major automobile manufacturers are all researching and developing new energy technologies with low emissions to adapt to this development trend. Among them, fuel cell vehicles are one of the fields that major automobile manufacturers are vigorously researching and developing. Fuel cells have many advantages such as cleanliness and high efficiency, and have received more and more attention.

[0003] A fuel cell is usually composed of dozens to hundreds of bipolar plates and membrane electrode assemblies stacked and assembled. The fluid distribution and flow inside it are realized through a multi-branch parallel pipeline system. There is also a multi-branch parallel pipeline system inside a proton exchange membrane fuel cell (PEMFC), and the most typical one is the flow field structure of the PEMFC bipolar plate. The bipolar plate of the PEMFC is covered with tiny and slender flow channels; when the fuel cell operates, the reaction gases at the anode and cathode are both introduced through the inlet ports (main pipelines) on both sides, and are divided into each area of the fuel cell under the constraint of multiple flow channels (branch pipelines). The reaction gases flow fully and react inside the battery, and then merge through the flow channels and are led out through the outlet of the bipolar plate.

[0004] However, in the multi-branch parallel pipeline system of the PEMFC bipolar plate, phenomena such as flow separation, eddy current, and pulsation often occur during the process of flow division and confluence. These phenomena will cause problems such as uneven flow distribution in the pipeline system and pipeline vibration, and further affect the energy consumption, performance, operation stability, and safety of the entire fuel cell system. For an unsteady parallel pipeline network, the change of flow rate in one or more branches will affect the flow distribution of the entire pipeline network. If the pipe diameters and structural designs of the main pipe and branch pipes are unreasonable, it will lead to less or even no flow rate at the proximal end, seriously affecting the normal progress of gas reaction.

[0005] Moreover, in recent years, PEMFCs are developing towards the direction of high energy density, so the bipolar plates have become thinner and lighter, and the flow channel size on the bipolar plates has been reduced to the order of 1×10 -1 mm, which increases the difficulty of designing the multi-branch parallel pipeline system and it is very difficult to control the flow parameters in a single branch pipe (flow channel). Summary of the Invention

[0006] Based on this, an embodiment of the present invention provides a one-way multi-branch parallel pipeline structure and its application, aiming to solve the problems of uneven flow distribution, pipeline vibration, less or even no flow at the proximal end, and difficulty in controlling the flow parameters in a single branch pipe (flow channel) in the existing fuel cell, which in turn affect the energy consumption, performance, operation stability and safety of the entire fuel cell system. The structure of the present invention can evenly distribute the flow of the fuel cell, better control the flow parameters in a single branch pipe (flow channel), and there is no pipeline vibration, less or even no flow at the proximal end, etc.

[0007] To achieve the above object, on the one hand, an embodiment of the present invention provides a one-way multi-branch parallel pipeline structure, including a first-stage pipe and a second-stage pipe connected in sequence;

[0008] The second-stage pipe includes at least six first branch pipes, second branch pipes, third branch pipes, fourth branch pipes, fifth branch pipes and sixth branch pipes that are independently arranged and have the same pipe diameter; the first branch pipe, the second branch pipe, the third branch pipe, the fourth branch pipe, the fifth branch pipe and the sixth branch pipe are respectively communicated with the first-stage pipe, and the height of the inlet of the first branch pipe > the height of the inlet of the second branch pipe > the height of the inlet of the third branch pipe > the height of the inlet of the fourth branch pipe > the height of the inlet of the fifth branch pipe > the height of the inlet of the sixth branch pipe;

[0009] A first fillet is provided on the outer side of the connection between the first-stage pipe and the first branch pipe, and a second fillet is provided on the outer side of the connection between the first-stage pipe and the sixth branch pipe.

[0010] As a preferred embodiment, the first branch pipe, the second branch pipe, the third branch pipe, the fourth branch pipe, the fifth branch pipe and the sixth branch pipe are parallel to each other and arranged at equal distances; the degrees of the first fillet and the second fillet are the same.

[0011] As a preferred embodiment, the sum of the pipe diameters of the first branch pipe, the second branch pipe, the third branch pipe, the fourth branch pipe, the fifth branch pipe and the sixth branch pipe is equal to the pipe diameter of the first-stage pipe. Such a setting reduces the pressure drop caused by fluid flow, is beneficial to promoting the fluid diversion, enables the flow distribution of each branch pipe to be uniform, and can effectively improve the utilization rate of the electrode plate, thereby effectively increasing the effective area of gas reaction.

[0012] As a preferred embodiment, a first baffle is provided between the first branch pipe and the second branch pipe, and the first baffle includes a first upper baffle and a first lower baffle that are integrally arranged, and a third fillet is provided at the connection between the first upper baffle and the first lower baffle;

[0013] A second baffle is provided between the second branch pipe and the third branch pipe. The second baffle includes a second upper baffle and a second lower baffle which are integrally provided, and a fourth fillet is provided at the connection between the second upper baffle and the second lower baffle;

[0014] A third baffle is provided between the third branch pipe and the fourth branch pipe. The third baffle includes a third upper baffle and a third lower baffle which are integrally provided, and a fifth fillet is provided at the connection between the third upper baffle and the third lower baffle;

[0015] A fourth baffle is provided between the fourth branch pipe and the fifth branch pipe. The fourth baffle includes a fourth upper baffle and a fourth lower baffle which are integrally provided, and a sixth fillet is provided at the connection between the fourth upper baffle and the fourth lower baffle;

[0016] A fifth baffle is provided between the fifth branch pipe and the sixth branch pipe. The fifth baffle includes a fifth upper baffle and a fifth lower baffle which are integrally provided, and a seventh fillet is provided at the connection between the fifth upper baffle and the fifth lower baffle.

[0017] As a preferred embodiment, the third fillet, the fourth fillet, the fifth fillet, the sixth fillet and the seventh fillet have the same degree. By providing each fillet, it is beneficial to promote the flow splitting of the fluid, make the flow distribution of each branch pipe uniform, reduce the loss of turbulent kinetic energy during the fluid flow, and reduce the gas kinetic energy loss caused by the structure, and avoid the generation of corner vortices.

[0018] As a preferred embodiment, a first node is provided at the intersection of the first upper baffle and the first-stage pipe;

[0019] A second node is provided at the intersection of the second upper baffle and the first-stage pipe;

[0020] A third node is provided at the intersection of the third upper baffle and the first-stage pipe;

[0021] A fourth node is provided at the intersection of the fourth upper baffle and the first-stage pipe;

[0022] A fifth node is provided at the intersection of the fifth upper baffle and the first-stage pipe.

[0023] As a preferred embodiment, the first flow splitting node, the second flow splitting node, the third flow splitting node, the fourth flow splitting node and the fifth flow splitting node descend at equal intervals in sequence. Such a setting is beneficial to promote the flow splitting of the fluid and make the flow distribution of each branch pipe uniform.

[0024] As a preferred embodiment, the first upper baffle intersects with the first-stage pipe to form a first inclination angle;

[0025] The second upper baffle intersects with the first-stage pipe to form a second inclination angle;

[0026] The third upper baffle intersects with the first-stage pipe to form a third inclination angle;

[0027] The fourth upper baffle intersects with the first-stage pipe to form a fourth inclination angle;

[0028] The fifth upper baffle intersects with the first-stage pipe to form a fifth inclination angle;

[0029] The first inclination angle, the second inclination angle, the third inclination angle, the fourth inclination angle, and the fifth inclination angle have the same degree.

[0030] As a preferred embodiment, the flow channel curvature of the first branch pipe > the flow channel curvature of the second branch pipe > the flow channel curvature of the third branch pipe > the flow channel curvature of the fourth branch pipe > the flow channel curvature of the fifth branch pipe > the flow channel curvature of the sixth branch pipe. With this setting, it is beneficial to promote the fluid diversion and can reduce the turbulent kinetic energy loss during the fluid flow, making the flow rate distribution of each branch pipe balanced.

[0031] On the other hand, the embodiment of the present invention also provides an application of the one-way multi-branch parallel pipeline structure, and the one-way multi-branch parallel pipeline structure can be applied to a fuel cell structure.

[0032] For example, the one-way multi-branch parallel pipeline structure can be applied to the hydrogen flow channel, oxygen flow channel, or water flow channel of the plate of a fuel cell. The hydrogen flow channel, oxygen flow channel, or water flow channel adopting the one-way multi-branch parallel pipeline structure of the present application has a uniform flow rate distribution, the overall pressure drop of the system is reduced, there is no situation of pipeline vibration, less or even no flow rate at the proximal end, and it can better control the flow rate parameters in a single branch pipe (flow channel), making the performance of the entire fuel cell system stable, and the operation stability and safety are both good. Moreover, it has a simple structure, low energy consumption, is economically practical, easy to install, and has good processability.

[0033] A one-way multi-branch parallel pipeline structure proposed by the present invention can realize the function of controlling the flow of multi-level inlet gas (fluid) in a multi-branch parallel pipeline by setting a multi-branch diversion structure, can ensure that the gas (fluid) flow rate distribution into each flow channel is more uniform, effectively reduce the overall pressure drop of the system, there is no situation of pipeline vibration, less or even no flow rate at the proximal end, etc., can better control the flow rate parameters in a single branch pipe (flow channel), making the performance of the entire system stable, and the operation stability and safety are both good. Moreover, it has a simple structure, low energy consumption, is economically practical, easy to install, and has good processability, and can be applied to a fuel cell system for use. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for the description of the embodiments or the prior art. Obviously, the drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can be obtained based on the structures shown in these drawings.

[0035] Figure 1 Schematic three-dimensional structure diagram of a one-way multi-branch parallel pipeline structure according to an embodiment of the present invention;

[0036] Figure 2 is Figure 1 front view of the one-way multi-branch parallel pipeline structure of.

[0037] The realization of the object of the present invention, functional characteristics and advantages will be further described in conjunction with the embodiments with reference to the drawings. Specific embodiments

[0038] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, rather than all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts fall within the scope of protection of the present invention.

[0039] It should be noted that if there are directional indications (such as up, down, left, right, front, back, top, bottom...) involved in the embodiments of the present invention, the directional indications are only used to explain the relative positional relationship and movement conditions between components in a specific posture (as shown in the drawings). If the specific posture changes, the directional indications will also change accordingly.

[0040] In the present invention, unless otherwise clearly defined and limited, terms such as "installation", "connection", "connection", "fixation" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or integrated; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium. It can be the communication inside two components or the interaction relationship between two components, unless otherwise clearly limited. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific situations.

[0041] It should be noted that when an element is referred to as "fixed to" or "disposed on" another element, it can be directly on the other element or there can also be an intermediate element. When an element is considered to be "connected" to another element, it can be directly connected to the other element or there may be an intermediate element at the same time.

[0042] In addition, if the embodiments of the present invention involve descriptions such as "first", "second", etc., the descriptions of "first", "second", etc. are only for descriptive purposes and should not be construed as indicating or implying their relative importance or implicitly indicating the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include at least one such feature. In addition, the technical solutions between various embodiments can be combined with each other, but it must be based on the ability of those of ordinary skill in the art to implement. When the combination of technical solutions results in contradictions or cannot be implemented, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

[0043] Generally, single fuel cells are connected in series to form a stack, and each fuel cell unit consists of a membrane electrode and a bipolar plate. Groove areas, i.e., flow channels, are machined on the surface of the bipolar plate through a molding / stamping technique; the fluid flow (hydrogen, air, water) inside the fuel cell is restricted within the grooves to form the internal flow field of the fuel cell. A large part of the fuel cell performance depends on the flow field of the bipolar plate, and the specific influencing factors include: the type of flow field plate; the flow direction of the fluid in the flow field; the length and number of flow channels; adding baffles in the flow channels; the size of the flow channels.

[0044] The above factors are related to heat transfer, mass transfer, and interfacial phenomena accompanied by electrochemical reactions. Since the bipolar plate undertakes the functions of gas supply and water drainage, the flow channel structure on the bipolar plate not only directly affects the diffusion mass transfer of the reaction gas to the gas diffusion layer and the process of generating water discharge, but also indirectly affects the heat transfer and distribution process generated by the electrochemical reaction. The performance of the fuel cell depends on the reactants and the water and heat management performance. Therefore, designing and improving the flow channel structure on the bipolar plate to strengthen the internal mass transfer and heat transfer processes is a key factor to be considered in improving the fuel cell performance.

[0045] Currently, the flow channel design of the bipolar plate of the prior art proton exchange membrane fuel cell is unreasonable, resulting in uneven fluid flow distribution. Another adverse reaction of this non-uniformity is the increase in pressure loss of the fuel cell system, the decrease in the reactant diffusion mass transfer ability, the decrease in utilization rate, and the decrease in fuel cell performance. Moreover, the flow distribution method of the existing structure is usually with the inlet at the upper right, the outlet at the lower left, and n flow channels arranged horizontally in parallel, so that the fluid needs to pass through the distribution of a large upstream transition area before entering the downstream flow channels, and the flow rates of the two side flow channels are relatively high while the flow rate of the middle flow channel is relatively low. In this way, the distribution of the reaction gas in the active area is not balanced, resulting in unbalanced and insufficient reactions.

[0046] To solve the above technical problems, the present invention proposes a unidirectional multi-branch parallel pipeline structure and its application.

[0047] Specifically, as Figures 1 to 2 shown, an embodiment of the present invention provides a one-way multi-branch parallel pipeline structure, including a first-stage pipe 10 and a second-stage pipe 20 connected in sequence;

[0048] The second-stage pipe 20 includes at least six independently arranged first branch pipes 21, second branch pipes 22, third branch pipes 23, fourth branch pipes 24, fifth branch pipes 25 and sixth branch pipes 26 with the same pipe diameter; the first branch pipe 21, the second branch pipe 22, the third branch pipe 23, the fourth branch pipe 24, the fifth branch pipe 25 and the sixth branch pipe 26 are respectively communicated with the first-stage pipe 10, and the height of the inlet of the first branch pipe 21 > the height of the inlet of the second branch pipe 22 > the height of the inlet of the third branch pipe 23 > the height of the inlet of the fourth branch pipe 24 > the height of the inlet of the fifth branch pipe 25 > the height of the inlet of the sixth branch pipe 26;

[0049] A first rounded corner A is provided on the outside of the connection between the first-stage pipe 10 and the first branch pipe 21, and a second rounded corner B is provided on the outside of the connection between the first-stage pipe 10 and the sixth branch pipe 26.

[0050] As a preferred embodiment, the first branch pipe 21, the second branch pipe 22, the third branch pipe 23, the fourth branch pipe 24, the fifth branch pipe 25 and the sixth branch pipe 26 are parallel to each other and arranged at equal distances; the degrees of the first rounded corner A and the second rounded corner B are the same.

[0051] As a preferred embodiment, the sum of the pipe diameters of the first branch pipe 21, the second branch pipe 22, the third branch pipe 23, the fourth branch pipe 24, the fifth branch pipe 25 and the sixth branch pipe 26 is equal to the pipe diameter of the first-stage pipe 10. With this setting, the pressure drop caused by fluid flow is reduced, which is beneficial to promoting fluid diversion, making the flow distribution of each branch pipe uniform, and at the same time can effectively improve the utilization rate of the electrode plate, thereby effectively increasing the effective area of gas reaction.

[0052] As a preferred embodiment, a first baffle 30 is provided between the first branch pipe 21 and the second branch pipe 22. The first baffle 30 includes a first upper baffle 31 and a first lower baffle 32 integrally arranged, and a third rounded corner C is provided at the connection between the first upper baffle 31 and the first lower baffle 32;

[0053] A second baffle 40 is provided between the second branch pipe 22 and the third branch pipe 23. The second baffle 40 includes a second upper baffle 41 and a second lower baffle 42 integrally arranged, and a fourth rounded corner D is provided at the connection between the second upper baffle 41 and the second lower baffle 42;

[0054] A third baffle 50 is disposed between the third branch pipe 23 and the fourth branch pipe 24. The third baffle 50 includes a third upper baffle 51 and a third lower baffle 52 which are integrally provided. A fifth fillet E is provided at the connection between the third upper baffle 51 and the third lower baffle 52.

[0055] A fourth baffle 60 is disposed between the fourth branch pipe 24 and the fifth branch pipe 25. The fourth baffle 60 includes a fourth upper baffle 61 and a fourth lower baffle 62 which are integrally provided. A sixth fillet F is provided at the connection between the fourth upper baffle 61 and the fourth lower baffle 62.

[0056] A fifth baffle 70 is disposed between the fifth branch pipe 25 and the sixth branch pipe 26. The fifth baffle 70 includes a fifth upper baffle 71 and a fifth lower baffle 72 which are integrally provided. A seventh fillet G is provided at the connection between the fifth upper baffle 71 and the fifth lower baffle 72.

[0057] As a preferred embodiment, the third fillet C, the fourth fillet D, the fifth fillet E, the sixth fillet F, and the seventh fillet G have the same degree. In the present application, the degrees of each fillet can be set according to actual needs. By providing each fillet, it is beneficial to promote the flow splitting of the fluid, make the flow rate distribution of each branch pipe uniform, and at the same time reduce the loss of turbulent kinetic energy during the fluid flow, and reduce the gas kinetic energy loss caused by the structure, and avoid generating corner vortices.

[0058] As a preferred embodiment, a first node P1 is provided at the intersection of the first upper baffle 31 and the first-stage pipe 10.

[0059] A second node P2 is provided at the intersection of the second upper baffle 41 and the first-stage pipe 10.

[0060] A third node P3 is provided at the intersection of the third upper baffle 51 and the first-stage pipe 10.

[0061] A fourth node P4 is provided at the intersection of the fourth upper baffle 61 and the first-stage pipe 10.

[0062] A fifth node P5 is provided at the intersection of the fifth upper baffle 71 and the first-stage pipe 10.

[0063] As a preferred embodiment, the first shunt node P1, the second shunt node P2, the third shunt node P3, the fourth shunt node P4, and the fifth shunt node P5 descend at equal intervals in sequence. In the embodiments of the present application, the amplitude of the equal interval descent is generally 0.12 mm to 0.16 mm. For example, the vertical distance between the first shunt node P1 and the second shunt node P2 is 0.12 mm to 0.16 mm, the vertical distance between the second shunt node P2 and the third shunt node P3 is 0.12 mm to 0.16 mm, the vertical distance between the third shunt node P3 and the fourth shunt node P4 is 0.12 mm to 0.16 mm, and the vertical distance between the fourth shunt node P4 and the fifth shunt node P5 is 0.12 mm to 0.16 mm. With such a setting, it is beneficial to promote the shunting of the fluid, making the flow rate distribution of each branch pipe uniform.

[0064] As a preferred embodiment, the first upper baffle 31 intersects with the first-stage pipe 10 to form a first inclination angle (not marked in the figure);

[0065] The second upper baffle 41 intersects with the first-stage pipe 10 to form a second inclination angle (not marked in the figure);

[0066] The third upper baffle 51 intersects with the first-stage pipe 10 to form a third inclination angle (not marked in the figure);

[0067] The fourth upper baffle 61 intersects with the first-stage pipe 10 to form a fourth inclination angle (not marked in the figure);

[0068] The fifth upper baffle 71 intersects with the first-stage pipe 10 to form a fifth inclination angle (not marked in the figure);

[0069] The first inclination angle, the second inclination angle, the third inclination angle, the fourth inclination angle, and the fifth inclination angle have the same degree.

[0070] As a preferred embodiment, the flow channel curvature of the first branch pipe 21 > the flow channel curvature of the second branch pipe 22 > the flow channel curvature of the third branch pipe 23 > the flow channel curvature of the fourth branch pipe 24 > the flow channel curvature of the fifth branch pipe 25 > the flow channel curvature of the sixth branch pipe 26. The magnitudes of the flow channel curvatures can be set according to actual needs. With such a setting, it is beneficial to promote the shunting of the fluid and can reduce the loss of turbulent kinetic energy during the fluid flow, making the flow rate distribution of each branch pipe balanced.

[0071] On the other hand, the embodiments of the present invention also provide an application of the one-way multi-branch parallel pipeline structure, and the one-way multi-branch parallel pipeline structure can be applied to a fuel cell structure.

[0072] For example, the one-way multi-branch parallel pipeline structure can be applied to the hydrogen flow channel, oxygen flow channel or water flow channel of the bipolar plate of a fuel cell. With the hydrogen flow channel, oxygen flow channel or water flow channel adopting the one-way multi-branch parallel pipeline structure of the present application, the flow rate distribution is uniform, the overall pressure drop of the system is reduced, there is no pipeline vibration, little or no flow at the proximal end, and the flow rate parameters in a single branch pipe (flow channel) can be better controlled, making the performance of the entire fuel cell system stable, with good operation stability and safety. Moreover, it has a simple structure, low energy consumption, is economically practical, easy to install, and has good processability.

[0073] When using the structure of the present application, the fluid flows into the pipeline system from the first-stage pipe 10 on the right side of the structure, with a horizontal velocity to the left. By controlling the heights, flow path curvatures, pipe diameters, etc. of the inlets of the first branch pipe 21, second branch pipe 22, third branch pipe 23, fourth branch pipe 24, fifth branch pipe 25 and sixth branch pipe 26, it is beneficial to promote the flow splitting of the fluid, so that the flow rate distribution of the first branch pipe 21, second branch pipe 22, third branch pipe 23, fourth branch pipe 24, fifth branch pipe 25 and sixth branch pipe 26 is balanced (the flow rate can be calculated by existing CFD methods). Moreover, by setting each fillet and each inclination angle and controlling their degrees, it is ensured that the direction and flow rate of the fluid entering each branch pipe are consistent, and at the same time, the loss of turbulent kinetic energy during the fluid flow process is reduced.

[0074] When applying the structure of the present application, the second-stage pipe can take six branch pipes as a unit, and by precisely regulating the flow rate of the first-stage pipe, the flow rate in the six branch pipes of the second-stage pipe can be controlled, so that the flow rate is distributed in a cycle with a one-way multi-branch parallel pipeline structure (the second-stage pipe contains six branch pipes) on the bipolar plate. By setting the flow channels of the bipolar plate in this way, the transition zone can be directly omitted, greatly expanding the reaction area on the bipolar plate; and within one cycle, through the structure of the present application, the flow rate difference in the six branch pipes of the second-stage pipe is reduced, effectively ensuring the balanced distribution of the flow rate, making the distribution of the reaction gas in the active area balanced, and the reaction balanced and sufficient.

[0075] A one-way multi-branch parallel pipeline structure proposed by the present invention can, by setting a multi-branch flow splitting structure, realize the function of controlling the flow of multi-level inlet gas (fluid) in a multi-branch parallel pipeline, ensure that the gas (fluid) flow rate distribution in each flow channel is more uniform, effectively reduce the overall pressure drop of the system, and there is no pipeline vibration, little or no flow at the proximal end, etc. The flow rate parameters in a single branch pipe (flow channel) can be better controlled, making the performance of the entire system stable, with good operation stability and safety. Moreover, it has a simple and beautiful structure, low energy consumption, is economically practical, easy to install, and has good processability, and can be applied to a fuel cell system for use.

[0076] The above are only the preferred embodiments of the present invention, and do not limit the patent scope of the present invention accordingly. Any equivalent structural transformation made under the inventive concept of the present invention by using the content of the specification and drawings of the present invention, or any direct / indirect application in other related technical fields is included in the patent protection scope of the present invention.

Claims

1. A one-way multi-branch parallel pipeline structure, characterized in that It includes a first-stage pipe and a second-stage pipe connected in sequence; The second-stage pipe includes at least six first branch pipes, second branch pipes, third branch pipes, fourth branch pipes, fifth branch pipes, and sixth branch pipes that are independently arranged and have the same pipe diameter; the first branch pipe, the second branch pipe, the third branch pipe, the fourth branch pipe, the fifth branch pipe, and the sixth branch pipe are respectively communicated with the first-stage pipe, and the height of the inlet of the first branch pipe > the height of the inlet of the second branch pipe > the height of the inlet of the third branch pipe > the height of the inlet of the fourth branch pipe > the height of the inlet of the fifth branch pipe > the height of the inlet of the sixth branch pipe; A first rounded corner is provided on the outer side of the connection between the first-stage pipe and the first branch pipe, and a second rounded corner is provided on the outer side of the connection between the first-stage pipe and the sixth branch pipe; The first branch pipe, the second branch pipe, the third branch pipe, the fourth branch pipe, the fifth branch pipe, and the sixth branch pipe are parallel to each other and arranged at equal distances; the degrees of the first rounded corner and the second rounded corner are the same; The sum of the pipe diameters of the first branch pipe, the second branch pipe, the third branch pipe, the fourth branch pipe, the fifth branch pipe, and the sixth branch pipe is equal to the pipe diameter of the first-stage pipe.

2. The one-way multi-branch parallel pipeline structure according to claim 1, wherein A first baffle is provided between the first branch pipe and the second branch pipe, the first baffle includes a first upper baffle and a first lower baffle integrally arranged, and a third rounded corner is provided at the connection between the first upper baffle and the first lower baffle; A second baffle is provided between the second branch pipe and the third branch pipe, the second baffle includes a second upper baffle and a second lower baffle integrally arranged, and a fourth rounded corner is provided at the connection between the second upper baffle and the second lower baffle; A third baffle is provided between the third branch pipe and the fourth branch pipe, the third baffle includes a third upper baffle and a third lower baffle integrally arranged, and a fifth rounded corner is provided at the connection between the third upper baffle and the third lower baffle; A fourth baffle is provided between the fourth branch pipe and the fifth branch pipe, the fourth baffle includes a fourth upper baffle and a fourth lower baffle integrally arranged, and a sixth rounded corner is provided at the connection between the fourth upper baffle and the fourth lower baffle; A fifth baffle is provided between the fifth branch pipe and the sixth branch pipe, the fifth baffle includes a fifth upper baffle and a fifth lower baffle integrally arranged, and a seventh rounded corner is provided at the connection between the fifth upper baffle and the fifth lower baffle.

3. The one-way multi-branch parallel pipeline structure according to claim 2, characterized in that, The third rounded corner, the fourth rounded corner, the fifth rounded corner, the sixth rounded corner, and the seventh rounded corner have the same degree.

4. The one-way multi-branch parallel pipeline structure according to claim 2, wherein A first node is provided at the intersection of the first upper baffle and the first-stage pipe; A second node is provided at the intersection of the second upper baffle and the first-stage pipe; A third node is provided at the intersection of the third upper baffle and the first-stage pipe; A fourth node is provided at the intersection of the fourth upper baffle and the first-stage pipe; A fifth node is provided at the intersection of the fifth upper baffle and the first-stage pipe.

5. The one-way multi-branch parallel pipeline structure according to claim 4, characterized in that The first node, the second node, the third node, the fourth node, and the fifth node are sequentially and equally spaced downwards.

6. The unidirectional multi-branch parallel pipeline structure according to claim 2, characterized in that, The first upper baffle and the first-stage pipe intersect to form a first inclination angle; The second upper baffle intersects with the first-stage pipe to form a second inclination angle; The third upper baffle intersects with the first-stage pipe to form a third inclination angle; The fourth upper baffle intersects with the first-stage pipe to form a fourth inclination angle; The fifth upper baffle intersects with the first-stage pipe to form a fifth inclination angle; The first inclination angle, the second inclination angle, the third inclination angle, the fourth inclination angle, and the fifth inclination angle have the same degree.

7. The unidirectional multi-branch parallel pipeline structure according to claim 1, wherein, The flow channel curvature of the first branch pipe > the flow channel curvature of the second branch pipe > the flow channel curvature of the third branch pipe > the flow channel curvature of the fourth branch pipe > the flow channel curvature of the fifth branch pipe > the flow channel curvature of the sixth branch pipe.

8. Application of the unidirectional multi-branch parallel pipeline structure according to any one of claims 1 to 7, characterized in that, The one-way multi-branch parallel pipeline structure is applied to a fuel cell structure.

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