Low-pressure hydrogen conveying pipeline

Abstract

The utility model belongs to the technical field of hydrogen fuel cell automobiles, and particularly relates to a low-pressure hydrogen conveying pipeline which comprises a multi-layer nylon pipe, a flange joint mechanism and a welding ring, the multi-layer nylon pipe comprises a nylon pipe main body and a chambering connecting part, and the nylon pipe main body is fixedly connected with the chambering connecting part. The flange connector mechanism comprises a first connector pipe, a second connector pipe, a third connector pipe and a flange connecting piece, the two ends of the second connector pipe in the length direction communicate with the first connector pipe and the third connector pipe correspondingly, and the end, away from the second connector pipe, of the third connector pipe is detachably connected with the flange connecting piece. The inner diameters of the nylon pipe main body, the first joint pipe and the second joint pipe are equal; the outer side surface of the reaming connecting part and the outer side surface of the second joint pipe are attached to the inner side surface of the welding ring; compared with the prior art, the utility model has the advantages and positive effects that the reaming design ensures the characteristic of low flow resistance, and the safety is greatly improved.

Description

Technical Field

[0001] This utility model belongs to the field of hydrogen fuel cell vehicle technology, specifically relating to a low-pressure hydrogen delivery pipeline. Background Technology

[0002] In recent years, hydrogen energy has developed rapidly, and related technologies have become increasingly mature. In particular, hydrogen fuel cell vehicles have seen a rapid increase in the number of installed units. After high-pressure hydrogen is reduced in pressure and transported to the fuel cell stack from the on-board hydrogen storage module, a dedicated low-pressure hydrogen transport pipeline is needed to handle the flow of hydrogen between the modules of the fuel cell stack. This pipeline generally includes the pipeline body, two end connectors, and connecting parts.

[0003] Existing low-pressure hydrogen transmission pipelines suffer from high flow resistance and poor sealing at the pipeline body and the joints at both ends, which reduces the safety of transmission. Therefore, there is an urgent need for a low-pressure hydrogen transmission pipeline with low flow resistance and high safety. Utility Model Content

[0004] This invention addresses the aforementioned problems by providing a low-pressure hydrogen delivery pipeline.

[0005] To achieve the above objectives, the technical solution adopted by this utility model is as follows: a low-pressure hydrogen transmission pipeline, comprising a multi-layer nylon tube, a flange joint mechanism, and a welding ring. The multi-layer nylon tube includes a nylon tube body and an enlarged hole connection part. The welding ring, the nylon tube body, and the enlarged hole connection part are all cylindrical. The nylon tube body and the enlarged hole connection part are fixedly connected. The inner diameter of the nylon tube body is smaller than the inner diameter of the enlarged hole connection part.

[0006] The flange joint mechanism includes a first joint pipe, a second joint pipe, a third joint pipe, and a flange connector. The two ends of the second joint pipe are respectively connected to the first joint pipe and the third joint pipe along the length direction. The end of the third joint pipe away from the second joint pipe is detachably connected to the flange connector.

[0007] The inner diameters of the nylon tube body, the first connector tube, and the second connector tube are equal. The outer side of the enlarged hole connecting part and the outer side of the second connector tube are both in contact with the inner side of the welding ring, and the inner side of the enlarged hole connecting part is in contact with the outer side of the first connector tube.

[0008] Preferably, both the nylon tube body and the enlarged hole connection part include an outer layer, an intermediate layer and a conductive inner layer, the three layers being coaxial, and all three being cylindrical. The inner side of the outer layer is attached to the outer side of the intermediate layer, and the inner side of the intermediate layer is attached to the outer side of the conductive inner layer.

[0009] Preferably, the conductive inner layer is a PVDF material layer, the outer layer is a nylon PA layer, and the intermediate layer is a fluorinated thermoplastic homopolymer layer.

[0010] Preferably, the welding ring has a first laser weld and a second laser weld. The welding ring is welded to the second connector pipe through the first laser weld, and the welding ring is welded to the enlarged hole connection part through the second laser weld.

[0011] Preferably, the device also includes a heat-shrinkable flame-retardant sheath, wherein the third connector tube is an L-shaped tube, and the third connector tube, flange connector, welding ring and multi-layer nylon tube are all fitted with the heat-shrinkable flame-retardant sheath.

[0012] Preferably, the end of the first connector tube away from the second connector tube has a guide chamfer.

[0013] Preferably, the flange connector includes a flange body and a connecting bolt assembly. The flange body has a connecting threaded hole, and the flange body is threadedly connected to the connecting bolt assembly through the connecting threaded hole.

[0014] Preferably, the side of the enlarged connection portion away from the nylon tube body is fitted with the second connector tube.

[0015] Preferably, the heat-shrinkable flame-retardant sheath is a three-layer heat-shrinkable sheath.

[0016] Compared with the prior art, the advantages and positive effects of this utility model are as follows:

[0017] (1) The inner diameters of the nylon tube body, the first connector tube and the second connector tube are equal. The inner diameter of the nylon tube body is smaller than the inner diameter of the enlarged hole connection part. The inner diameters of the nylon tube body, the first connector tube and the second connector tube are equal. The enlarged hole design ensures low flow resistance characteristics and greatly improves safety.

[0018] (2) The welding ring is welded to the second joint pipe through laser weld seam one, and the welding ring is welded to the enlarged hole connection part through laser weld seam two. The laser welding design formed by the welding ring, the enlarged hole multilayer nylon pipe and the flange joint mechanism ensures the connection and sealing characteristics and has good sealing performance.

[0019] (3) The conductive inner layer is conductive, and the conductive path design formed by the multi-layer nylon tube and the welding ring ensures that static electricity will not accumulate;

[0020] (4) The third joint pipe is an L-shaped pipe. The third joint pipe, flange connector, welding ring and multi-layer nylon pipe are all fitted with heat-shrinkable flame-retardant sheath. After heat shrinking, the heat-shrinkable flame-retardant sheath wraps around the bent third joint pipe to ensure that the outer layer of the pipeline meets the flame-retardant rating.

[0021] (5) The conductive inner layer is a PVDF material layer. PVDF material has low ion precipitation and conductivity, and has good hydrogen compatibility and hydrogen permeability resistance. It is an ideal hydrogen-resistant nylon material. The outer layer is a nylon PA11 layer. PA11 has a tough structure and has heat and light resistance properties. It is an ideal pipeline outer layer material. The middle layer is a fluorinated thermoplastic homopolymer layer, which is used to connect the conductive inner layer and the outer layer. Attached Figure Description

[0022] To more clearly illustrate the technical solutions of the embodiments of this utility model, the accompanying drawings used in the description of the embodiments will be briefly introduced below:

[0023] Figure 1 This is a front view of a low-pressure hydrogen delivery pipeline.

[0024] Figure 2 This is a cross-sectional view of a low-pressure hydrogen delivery pipeline.

[0025] Figure 3 for Figure 2 A magnified view of a portion of point A in the middle;

[0026] Figure 4 Top view of a low-pressure hydrogen delivery pipeline;

[0027] Figure 5 A three-dimensional view of a low-pressure hydrogen delivery pipeline;

[0028] Figure 6 Front view of the flange joint mechanism of a low-pressure hydrogen transmission pipeline;

[0029] Figure 7 A perspective view of the flange joint mechanism of a low-pressure hydrogen transmission pipeline;

[0030] Figure 8 A three-dimensional view of a multi-layered nylon tube in a low-pressure hydrogen delivery pipeline.

[0031] Figure label:

[0032] 1. Multi-layer nylon tube; 11. Nylon tube body; 12. Expanded hole connection part;

[0033] 2. Flange joint mechanism; 21. First joint pipe; 22. Second joint pipe; 23. Third joint pipe; 24. Flange connector; 25. Flange body; 26. Connecting threaded hole.

[0034] 3. Welding ring. Detailed Implementation

[0035] To better understand the above-mentioned objectives, features and advantages of this utility model, the present utility model will be further described below in conjunction with the accompanying drawings and embodiments.

[0036] Many specific details are set forth in the following description in order to provide a full understanding of the present invention. However, the present invention may also be implemented in other ways different from those described herein. Therefore, the present invention is not limited to the specific embodiments disclosed in the following specification.

[0037] Example 1

[0038] The following is combined Figures 1 to 8 Please provide a detailed description of the low-pressure hydrogen delivery pipeline, such as... Figure 1 , Figure 2 and Figure 3 As shown, a low-pressure hydrogen transmission pipeline includes a multi-layer nylon tube 1, a flange joint mechanism 2, and a welding ring 3. The multi-layer nylon tube 1 includes a nylon tube body 11 and an enlarged hole connection part 12. The welding ring 3, the nylon tube body 11, and the enlarged hole connection part 12 are all cylindrical. The nylon tube body 11 and the enlarged hole connection part 12 are fixedly connected. The inner diameter of the nylon tube body 11 is smaller than the inner diameter of the enlarged hole connection part 12.

[0039] like Figure 4 , Figure 5 and Figure 6 As shown, the flange joint mechanism 2 includes a first joint pipe 21, a second joint pipe 22, a third joint pipe 23, and a flange connector 24. The two ends of the second joint pipe 22 are connected to the first joint pipe 21 and the third joint pipe 23 respectively along its length. The end of the third joint pipe 23 away from the second joint pipe 22 is detachably connected to the flange connector 24.

[0040] like Figure 3 As shown, the inner diameters of the nylon tube body 11, the first connector tube 21, and the second connector tube 22 are equal. The outer side of the enlarged hole connecting part 12 and the outer side of the second connector tube 22 are both in contact with the inner side of the welding ring 3, and the inner side of the enlarged hole connecting part 12 is in contact with the outer side of the first connector tube 21.

[0041] like Figure 8 As shown, both the nylon tube body 11 and the enlarged hole connection part 12 include an outer layer, an intermediate layer and a conductive inner layer. The outer layer, intermediate layer and conductive inner layer are coaxial. The outer layer, intermediate layer and conductive inner layer are all cylindrical. The inner side of the outer layer is attached to the outer side of the intermediate layer, and the inner side of the intermediate layer is attached to the outer side of the conductive inner layer.

[0042] The conductive inner layer is a PVDF material layer, the outer layer is a nylon PA11 layer, and the middle layer is a fluorinated thermoplastic homopolymer layer.

[0043] The welding ring 3 has a laser weld seam 1 and a laser weld seam 2. The welding ring 3 is welded to the second joint tube 22 through the laser weld seam 1, and the welding ring 3 is welded to the enlarged hole connection part 12 through the laser weld seam 2.

[0044] It also includes a heat-shrinkable flame-retardant sheath, the third connector tube 23 is an L-shaped tube, and the third connector tube 23, flange connector 24, welding ring 3 and multi-layer nylon tube 1 are all fitted with the heat-shrinkable flame-retardant sheath.

[0045] like Figure 6 and Figure 7 As shown, the end of the first connector tube 21 away from the second connector tube 22 has a guide chamfer.

[0046] like Figure 6 and Figure 7 As shown, the flange connector 24 includes a flange body 25 and a connecting bolt assembly. The flange body 25 has a connecting threaded hole 26, and the flange body 25 is threadedly connected to the connecting bolt assembly through the connecting threaded hole 26.

[0047] like Figure 2 and Figure 3 As shown, the side of the enlarged hole connection part 12 away from the nylon tube body 11 is attached to the second connector tube 22.

[0048] The heat-shrinkable flame-retardant sheath consists of three layers. The third connector tube 23 is an L-shaped tube, which is a curved tube. To ensure safety, it needs to meet a certain flame-retardant rating. The three-layer heat-shrinkable flame-retardant sheath wraps around the curved L-shaped tube, ensuring that the outer layer meets the flame-retardant requirements. During the assembly of the three-layer heat-shrinkable sheath, it is designed and cut so that it can fit the L-shaped tube well after heat shrinking, achieving a tight, neat, and leak-free wrapping.

[0049] The conductive inner layer is a PVDF material layer, which has conductive properties. The corresponding material is PVDF, a high-strength, corrosion-resistant material that is commonly used to manufacture water pipes. Among fluoroplastics, PVDF has the characteristics of strong toughness, low coefficient of friction, strong corrosion resistance, aging resistance, weather resistance, and good radiation resistance.

[0050] The outer layer is made of nylon PA11, which is lightweight, corrosion-resistant, not prone to fatigue cracking, has good sealing performance and low resistance. It is used to make automotive fuel lines and brake lines.

[0051] The intermediate layer is a fluorinated thermoplastic homopolymer layer. The corresponding material is fluorinated thermoplastic homopolymer, which is a thermoplastic polymer made from a fluorinated monomer. It usually has high thermal stability, excellent lubricity, and is a good electrical insulating material. Because there are no mobile electrons in the molecular chain and the structure is compact, fluorinated thermoplastic homopolymer has good resistance to electric fields and is often used in the insulation parts of electrical equipment.

[0052] Working principle of low-pressure hydrogen delivery pipeline:

[0053] The expanded hole connection part 12 of the multilayer nylon tube 1 is welded to the first joint tube 21 of the flange joint mechanism 2 by welding ring 3, which ensures high sealing performance and firm connection. The inner diameters of the nylon tube body 11, the first joint tube 21 and the second joint tube 22 are equal. The expanded hole design ensures low flow resistance characteristics and greatly improves safety.

[0054] The above description is merely a preferred embodiment of the present utility model and is not intended to limit the present utility model in any other way. Any person skilled in the art may make changes or modifications to the above-disclosed technical content to create equivalent embodiments for application in other fields. However, any simple modifications or equivalent changes made to the above embodiments based on the technical essence of the present utility model without departing from the technical solution of the present utility model shall still fall within the protection scope of the technical solution of the present utility model.

Claims

1. A low-pressure hydrogen transmission pipeline, characterized in that: The system includes a multi-layer nylon tube (1), a flange joint mechanism (2), and a welding ring (3). The multi-layer nylon tube (1) includes a nylon tube body (11) and an enlarged hole connection part (12). The welding ring (3), the nylon tube body (11), and the enlarged hole connection part (12) are all cylindrical. The nylon tube body (11) and the enlarged hole connection part (12) are fixedly connected. The inner diameter of the nylon tube body (11) is smaller than the inner diameter of the enlarged hole connection part (12). The flange joint mechanism (2) includes a first joint pipe (21), a second joint pipe (22), a third joint pipe (23), and a flange connector (24). The two ends of the second joint pipe (22) in the length direction are respectively connected to the first joint pipe (21) and the third joint pipe (23). The end of the third joint pipe (23) away from the second joint pipe (22) is detachably connected to the flange connector (24). The inner diameters of the nylon tube body (11), the first connector tube (21) and the second connector tube (22) are equal. The outer side of the enlarged hole connecting part (12) and the outer side of the second connector tube (22) are both in contact with the inner side of the welding ring (3). The inner side of the enlarged hole connecting part (12) is in contact with the outer side of the first connector tube (21).

2. The low-pressure hydrogen transmission pipeline according to claim 1, characterized in that: The nylon tube body (11) and the enlarged hole connection part (12) both include an outer layer, an intermediate layer and a conductive inner layer. The outer layer, the intermediate layer and the conductive inner layer are coaxial. The outer layer, the intermediate layer and the conductive inner layer are all cylindrical. The inner side of the outer layer is attached to the outer side of the intermediate layer, and the inner side of the intermediate layer is attached to the outer side of the conductive inner layer.

3. A low-pressure hydrogen transmission pipeline according to claim 2, characterized in that: The conductive inner layer is a PVDF material layer, the outer layer is a nylon PA11 layer, and the middle layer is a fluorinated thermoplastic homopolymer layer.

4. A low-pressure hydrogen transmission pipeline according to claim 1, characterized in that: The welding ring (3) has a laser weld seam one and a laser weld seam two. The welding ring (3) is welded to the second connector pipe (22) through the laser weld seam one, and the welding ring (3) is welded to the enlarged hole connection part (12) through the laser weld seam two.

5. A low-pressure hydrogen transmission pipeline according to claim 1, characterized in that: It also includes a heat-shrinkable flame-retardant sheath. The third connector tube (23) is an L-shaped tube. The third connector tube (23), flange connector (24), welding ring (3) and multi-layer nylon tube (1) are all fitted with the heat-shrinkable flame-retardant sheath.

6. A low-pressure hydrogen transmission pipeline according to claim 1, characterized in that: The first connector tube (21) has a guide chamfer at the end away from the second connector tube (22).

7. A low-pressure hydrogen transmission pipeline according to claim 1, characterized in that: The flange connector (24) includes a flange body (25) and a connecting bolt assembly. The flange body (25) has a connecting threaded hole (26), and the flange body (25) is threadedly connected to the connecting bolt assembly through the connecting threaded hole (26).

8. A low-pressure hydrogen transmission pipeline according to claim 1, characterized in that: The side of the enlarged connection part (12) away from the nylon tube body (11) is attached to the second connector tube (22).

9. A low-pressure hydrogen transmission pipeline according to claim 5, characterized in that: The heat-shrinkable flame-retardant sheath is a three-layer heat-shrinkable sheath.

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