High-pressure hydrogen conveying composite electric melting pipe fitting

Abstract

The invention discloses a high-pressure hydrogen transmission composite electric melting pipe fitting, which belongs to the technical field of composite pipe fittings, and comprises non-metal hydrogen transmission pipes, the adjacent non-metal hydrogen transmission pipes are connected through pipe joints, and the pipe joints sleeve the connecting ends of the two adjacent non-metal hydrogen transmission pipes; a presoaked graticule fiber strip layer is arranged in the pipe connector, and a plastic-laminated aluminum foil serving as a hydrogen barrier layer is arranged on the inner side of the presoaked graticule fiber strip layer.

Description

Technical Field

[0001] The invention belongs to the technical field of composite pipe fittings, and in particular relates to a high-pressure hydrogen transmission composite electric fusion pipe fitting. Background Art

[0002] The statements herein merely provide background information related to the present invention and do not necessarily constitute prior art.

[0003] As an emerging energy source, hydrogen has attracted much attention for its green and efficient advantages in the development of related technical equipment. Pipelines, as important equipment in the hydrogen transportation process, are also a research focus. Existing long-distance pure hydrogen pipelines are mostly metal pipelines. Non-metallic pipeline hydrogen transportation has developed rapidly due to its long life, corrosion resistance, light weight, easy installation, and flexibility. Pipe fittings, as important connection nodes of non-metallic hydrogen pipes, are particularly important in the overall pipeline system.

[0004] Non-metallic pipe fittings can be divided into two types: pure plastic series, steel skeleton reinforced series, and fiber reinforced series. Pure plastic series (PE, PP, PA, etc.) are limited by the minimum required strength (MRS) of the material. For example, the wall thickness of the high pressure-bearing structure is often thicker. The increase in thickness greatly reduces the economic efficiency of the product and occupies more construction space. Therefore, the current pressure-bearing design of pure plastic pipe fittings is generally below PN2.0MPa (20℃). The pipe fittings only have a pressure-bearing function and do not have a special anti-hydrogen leakage function. Steel skeleton reinforced pipe fittings generally use perforated steel strips as a reinforcement layer to improve the pressure-bearing capacity of the pipe fittings. The pressure-bearing capacity of the product is generally designed to be below PN4.0MPa (20℃). Although it has a relatively higher pressure-bearing capacity, it does not have a special anti-hydrogen leakage function as a whole. In recent years, fiber-reinforced series have been gradually selected with the advancement of fiber material technology. Fiber reinforcement is a technical process based on fiber filament winding, mainly glass fiber, and because the winding direction focuses on the circumferential direction (angle winding), in order to improve the axial force tensile strength of pipe fittings in actual operation and application, it is often necessary to hot-melt butt-joint the pipes and then use electric fusion connection of pipe fittings to achieve axial and circumferential pressure-bearing requirements. Similarly, the whole does not have a special anti-hydrogen leakage function.

[0005] Chinese patent application CN114484127A mentions a plastic electric fusion pipe fitting that is resistant to hydrogen penetration, and explains the calculation of the thickness of the hydrogen penetration-resistant partition material, but it has the following defects: 1) There is no pressure-bearing reinforcement layer, and the pressure-bearing materials are all non-metallic materials with low pressure-bearing capacity, which limits the application field of the product; 2) The composite structure of the partition material and the pipe fitting has poor stability, and there is a stratification problem caused by the different shrinkage rates of the partition material and the pipe fitting. Hydrogen leaks rapidly from the stratification, causing the hydrogen penetration resistance of the pipe fitting to fail; 3) The hydrogen penetration-resistant layer is cylindrical, and the material thickness is limited by the manufacturing process, which is often thicker and more costly. Summary of the invention

[0006] In view of the deficiencies in the prior art, the purpose of the present invention is to provide a high-pressure hydrogen transmission composite electric fusion pipe fitting, which can be used for high-pressure non-metallic hydrogen transmission pipes and can be directly connected by electric fusion on site after the pipe joint and the non-metallic hydrogen transmission pipe are sleeved.

[0007] In order to achieve the above object, the present invention is implemented through the following technical solutions:

[0008] In the first aspect, the present invention provides a high-pressure hydrogen transmission composite electric fusion pipe fitting, including a non-metallic hydrogen transmission pipe. Adjacent sections of the non-metallic hydrogen transmission pipe are connected by a pipe joint, and the pipe joint is sleeved on the connecting ends of two adjacent non-metallic hydrogen transmission pipes; a pre-impregnated warp and weft mesh fiber strip layer is arranged in the pipe joint, and a plasticized aluminum foil as a hydrogen barrier layer is arranged on the inner side of the pre-impregnated warp and weft mesh fiber strip layer.

[0009] As a further technical solution, the pipe joint is an annular tubular structure, and the pipe joint has an annular storage space. The pre-impregnated warp and weft mesh fiber strip layer and the plasticized aluminum foil are placed in the annular storage space, and the pre-impregnated warp and weft mesh fiber strip layer serves as a reinforcement layer of the pressure-bearing structure.

[0010] As a further technical solution, the pre-impregnated warp and weft mesh fiber tape layer is composited with a pre-impregnated warp tape and a pre-impregnated weft tape, and the warp of the pre-impregnated warp tape and the weft of the pre-impregnated weft tape are vertically arranged at an angle of 90°.

[0011] As a further technical solution, the prepreg warp tape is perpendicular to the axial direction of the non-metallic hydrogen transport pipe, and the prepreg weft tape is parallel to the axial direction of the non-metallic hydrogen transport pipe.

[0012] As a further technical solution, the laminar aluminum foil is arranged in contact with the pre-impregnated warp and weft mesh fiber strip layer, and the laminar aluminum foil and the pre-impregnated warp and weft mesh fiber strip layer are both arranged in a ring shape.

[0013] As a further technical solution, a plastic layer is provided on the outer side of the plastic aluminum foil, and the plastic layer is made of polymer bonding resin.

[0014] As a further technical solution, the pipe joint and the non-metallic hydrogen transmission pipe are connected by electric fusion; a resistance wire is arranged on the inner wall of the pipe joint, a terminal is arranged on the outer periphery of the pipe joint, a connecting wire is arranged inside the terminal to connect with the resistance wire, and the terminal is connected to an external power supply device.

[0015] As a further technical solution, the pipe joint is provided with an outer layer structure corresponding to the outside of the preimpregnated warp and weft mesh fiber strip layer, and the outer layer structure is coated on the outside of the preimpregnated warp and weft mesh fiber strip layer; the material of the pipe joint and the outer layer structure is the same as the outer layer material of the non-metallic hydrogen transport pipe.

[0016] As a further technical solution, the number of layers of the prepreg warp tape is obtained by the following formula:

[0017]

[0018] Among them: P1 is the calculated circumferential compressive strength of the warp layer; p1 is the strength of the single-layer warp prepreg fiber tape; e1 is the thickness of the single-layer warp prepreg fiber tape; n1 is the number of layers of prepreg fiber tape used in the warp layer; C is the layer coefficient; ε1 is the elongation at break of the warp tape; d1 is the corresponding warp in the reinforcement layer.

[0019] As a further technical solution, the number of layers of the prepreg weft tape is obtained by the following formula:

[0020]

[0021] Among them: P2 is the calculated axial compressive strength of the weft layer, p2 is the strength of the single-layer weft preimpregnated fiber tape; e2 is the thickness of the single-layer weft preimpregnated fiber tape; n2 is the number of layers of preimpregnated fiber tape used in the weft layer; C is the layer coefficient; ε2 is the elongation at break of the weft tape; d2 is the corresponding weft layer reinforcement layer center warp.

[0022] As a further technical solution, the length L1 of the pre-impregnated warp and weft fiber tape layer is obtained by the following formula:

[0023]

[0024] Where: P is the designed axial bearing strength; r is the corresponding inner radius of the pipe; d3 is the outer diameter at the calculated interface; C is the design coefficient; b is the peel strength at the calculated interface; ε is the elongation at break of the weft tape.

[0025] The beneficial effects of the present invention are as follows:

[0026] The composite electric fusion pipe fitting of the present invention is a multi-structured composite pipe fitting formed by a non-metallic hydrogen transmission pipe and a pipe joint, wherein the plasticized aluminum foil serves as a hydrogen barrier layer, and the pre-impregnated warp and weft mesh fiber strip layer serves as a reinforcement layer of a pressure-bearing structure. The aluminum foil may be pure aluminum or alloy aluminum, and the plasticized layer on the surface of the aluminum foil may provide excellent peeling strength, so that the hydrogen barrier layer is composited with the pressure-bearing reinforcement layer and the pipe fitting body to form an integral structure; the pre-impregnated resin base resin adopts the same material as the pipe fitting, which can effectively ensure the overall composite effect of the pipe fitting, and the pressure bearing capacity of the pipe fitting can be individually designed according to the pressure bearing requirements of the pipeline system.

[0027] In the composite electric fusion pipe fitting of the present invention, the pressure-bearing reinforcement layer is outside the hydrogen barrier layer, thereby avoiding the problem of pressure-bearing performance degradation caused by hydrogen damage to the pre-impregnated warp and weft fiber strip layer.

[0028] The composite electric fusion pipe fitting of the present invention has a pre-impregnated warp and weft mesh fiber strip layer, which is divided into two parts: a pre-impregnated warp layer and a pre-impregnated weft layer. The two parts are combined into an integrated structure and can be designed separately according to the required pressure-bearing strength. The pre-impregnated warp layer mainly plays a role in bearing the annular pressure of the pipeline, and the pre-impregnated weft layer mainly plays a role in bearing the axial pressure of the pipeline, which is also an important design for the pipe fitting to have a high pressure-bearing capacity. Through the separate design of axial pressure bearing and annular pressure bearing, the problem of the original reinforced pipe fittings only considering a single annular pressure bearing problem (inadequate consideration of only electric fusion connection will easily lead to axial damage of the pipe fittings) is avoided, thereby ensuring the overall pressure bearing consistency of the pipeline.

[0029] In the composite electric fusion pipe fitting of the present invention, the main body of the pipe joint except the pressure-bearing reinforcement layer, the hydrogen barrier layer, the resistance wire and the terminal is consistent with the outer layer structure material, thereby ensuring the welding effect of the pipeline.

[0030] The composite electric fusion pipe fitting of the present invention adopts an aluminum foil winding process for the hydrogen barrier layer, which can be adjusted according to demand, thereby avoiding the problem of waste of raw materials caused by production work. For example, the present invention uses an aluminum foil of only 0.05 mm to form a hydrogen barrier layer through a winding process, while the metal cylindrical design generally has a thickness greater than 1 mm, so the present invention saves more raw materials.

[0031] The composite electric fusion pipe fitting of the present invention is coated with adhesive resin through plastic aluminum foil and has good peeling strength support with each layer of material, thereby ensuring structural stability and avoiding the problem of delamination failure caused by different shrinkage rates of each layer of material during long-term use of the pipe fitting.

[0032] The composite electric fusion pipe fitting of the present invention provides a design method for the corresponding number of layers corresponding to different strip materials, and provides a calculation method for calculating the design of the pressure-bearing reinforcement layer length L1 based on the peeling strength, thereby providing a design method for determining the length of the pipe fitting reinforcement layer by using the weakest interface shear force among the interfaces of each layer, to ensure that the composite structures of each layer remain stable when the pipe fitting is subjected to axial pressure during use, to ensure that each layer does not delaminate due to axial force, thereby finding the worst shear force of the composite interface of each layer of the pipe fitting as a calculation basis, and can be used for the axial force stability calculation design of various composite structure pipe fittings. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] The accompanying drawings in the specification, which constitute a part of the present invention, are used to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute improper limitations on the present invention.

[0034] Figure 1 is a schematic diagram of a high-pressure hydrogen transmission composite electric fusion pipe fitting according to one or more embodiments of the present invention;

[0035] Figure 2 is a schematic diagram of a laminated aluminum foil according to one or more embodiments of the present invention;

[0036] Figure 3 It is a schematic diagram of the dimensions of each position of a high-pressure hydrogen transmission composite electric fusion pipe fitting according to one or more embodiments of the present invention;

[0037] In the figure: 1. Pipe joint, 2. Plasticized aluminum foil, 3. Pre-impregnated warp and weft mesh fiber strip layer, 4. Outer layer structure, 5. Terminal, 6. Resistance wire, 7. Non-metallic hydrogen transmission pipe, 8. Plastic layer.

[0038] In order to show the positions of various parts, the distances or sizes between them are exaggerated and the schematic diagram is for reference only. DETAILED DESCRIPTION

[0039] It should be noted that the following detailed descriptions are illustrative and intended to provide further explanation of the present invention. Unless otherwise specified, all technical and scientific terms used in the present invention have the same meanings as those commonly understood by those skilled in the art to which the present invention belongs.

[0040] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present invention. As used herein, unless otherwise explicitly stated in the present invention, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "include" and / or "include" are used in this specification, it indicates the presence of features, steps, operations, devices, components and / or combinations thereof;

[0041] For the convenience of description, if the words "up", "down", "left" and "right" appear in the present invention, they only indicate that they are consistent with the up, down, left and right directions of the drawings themselves, and do not limit the structure. They are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it cannot be understood as a limitation on the present invention.

[0042] Terminology explanation section: If the terms "install", "connect", "connect", "fixed" and the like appear in the present invention, they should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integrated connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium; it can be an internal connection between two elements, or an interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to the specific circumstances.

[0043] In a typical embodiment of the present invention, Figure 1 As shown, a high-pressure hydrogen transport composite electric fusion pipe fitting is proposed, which is a non-metallic hydrogen transport pipe fitting with high pressure bearing effect.

[0044] The composite electric fusion pipe fitting comprises a non-metallic hydrogen transmission pipe 7 . Adjacent sections of the non-metallic hydrogen transmission pipe 7 are connected via a pipe joint 1 . The pipe joint 1 is sleeved on the connecting ends of two adjacent non-metallic hydrogen transmission pipes 7 .

[0045] The pipe joint 1 is an annular tubular structure, and the pipe joint 1 has an annular storage space, which is arranged in the wall of the pipe joint 1. A pre-impregnated warp and weft mesh fiber strip layer 3 is arranged in the annular storage space, and the pre-impregnated warp and weft mesh fiber strip layer 3 serves as a reinforcing layer of the pressure-bearing structure.

[0046] The pre-impregnated warp and weft fiber tape layer 3 is composed of a pre-impregnated warp tape and a pre-impregnated weft tape. The warp of the pre-impregnated warp tape and the weft of the pre-impregnated weft tape are arranged vertically at an angle of 90°. The specific combination form is determined according to the product design nominal pressure. The axial and annular nominal pressure design of the pipeline can be correspondingly designed by adjusting the number of composite layers of the warp and weft tapes.

[0047] After the pipe joint 1 is installed in the pipeline system, the prepreg warp tape is perpendicular to the axial direction of the pipeline, and the prepreg weft tape is parallel to the axial direction of the pipeline.

[0048] A laminated aluminum foil 2 is also arranged in the annular storage space of the pipe joint 1. The laminated aluminum foil 2 is arranged in contact with the pre-impregnated warp and weft mesh fiber strip layer 3. The laminated aluminum foil 2 is placed inside the pre-impregnated warp and weft mesh fiber strip layer 3. The laminated aluminum foil 2 serves as a hydrogen barrier layer. The overall aluminum foil thickness can be adjusted by superposition according to the hydrogen barrier performance requirements. The thickness of the aluminum foil is generally controlled to be above 0.05 mm per single layer. If there is no special requirement, the aluminum foil layer is generally designed as a complete two-layer design.

[0049] The over-laminated aluminum foil 2 and the pre-impregnated warp and weft mesh fiber strip layer 3 are both arranged in an annular shape. The over-laminated aluminum foil 2 is covered with an over-laminated layer 8, and the over-laminated layer 8 is made of a polymer (PE / PP etc. as a base material) bonded with a resin.

[0050] The pipe joint 1 is provided with an outer layer structure 4 corresponding to the outer side of the pre-impregnated warp and weft mesh fiber tape layer 3 , and the outer layer structure 4 is coated on the outer side of the pre-impregnated warp and weft mesh fiber tape layer 3 .

[0051] The pipe joint 1 and the non-metallic hydrogen transport pipe 7 are connected by electric fusion. Specifically, a resistance wire 6 is arranged on the inner wall of the pipe joint 1. The resistance wire is arranged in a loop, and the resistance wire is arranged in multiple loops and is evenly distributed along the axial direction of the inner wall of the pipe joint 1. A terminal 5 is arranged on the outer periphery of the pipe joint 1. A connecting line is arranged inside the terminal 5 to connect with the resistance wire 6. The terminal 5 is connected to an external power supply device. The resistance wire 6 mainly uses the principle of resistance heating to perform electric fusion connection with the outer layer of the non-metallic hydrogen transport pipe 7. The resistance wire is heated by electricity through the terminal 5.

[0052] The material of the pipe joint 1 and the outer layer structure 4 is the same as the outer layer material of the non-metallic hydrogen transport pipe 7 .

[0053] The main body material of the pipe joint 1 can be polyethylene, polypropylene, nylon and the like.

[0054] The pipe joint 1 is in a bonding composite form as a whole, ensuring the stability of the product structure.

[0055] In a further solution, the pre-impregnated warp and weft mesh fiber tape layer 3 is a composite of pre-impregnated fiber material and pre-impregnated resin material; the fiber in the pre-impregnated warp and weft mesh fiber tape layer 3 may be a variety of fiber materials such as but not limited to glass fiber, carbon fiber, polyester fiber, basalt fiber, steel fiber, etc., and the pre-impregnated resin material may be but not limited to polyethylene, polypropylene, nylon and other materials. The pre-impregnated warp tape in the pre-impregnated warp and weft mesh fiber tape layer 3 mainly plays the role of sharing the annular pressure in the process of conveying the medium in the pipeline system. The pre-impregnated weft tape in the pre-impregnated warp and weft mesh fiber tape layer 3 mainly plays the role of sharing the axial pressure in the process of conveying the medium in the pipeline system. The pre-impregnated warp tape and the pre-impregnated weft tape in the pre-impregnated warp and weft mesh fiber tape layer 3 can be implemented in a cross design (one layer of warp, one layer of weft) or in a composite manner of inner warp and outer weft, or inner weft and outer warp.

[0056] The number of layers of pre-impregnated warp tapes and pre-impregnated weft tapes in the pre-impregnated warp and weft mesh fiber tape layer should be designed separately. The corresponding design method is as follows:

[0057] The design of the warp layer is as follows, where P1 is the calculated circumferential bearing strength of the warp layer (MPa):

[0058]

[0059] Wherein: p1 is the strength of a single-layer warp prepreg fiber tape, in MPa; e1 is the thickness of a single-layer warp prepreg fiber tape, in mm; n1 is the number of layers of prepreg fiber tape used in the warp layer, dimensionless; C is the layer coefficient, dimensionless; ε1 is the elongation at break of the warp tape; d1 is the corresponding warp of the reinforcement layer, in mm.

[0060] Among them, the layer coefficient C can be determined according to the following table.

[0061]

[0062] In the calculation process, p1, e1, and ε1 are the basic properties of the fiber tape used. d1 is the size determined during the product design process, which can be determined based on the size setting of this layer. The above formula can be used to calculate the number of layers of prepreg fiber tape used in the warp layer according to the nominal pressure required by the design, and the number of layers used must not be less than the n1 value required by the calculation.

[0063] The design of the weft layer is as follows, where P2 is the calculated axial compressive strength of the weft layer (MPa):

[0064]

[0065] Among them: p2 is the strength of a single-layer weft preimpregnated fiber tape, in MPa; e2 is the thickness of a single-layer weft preimpregnated fiber tape, in mm; n2 is the number of layers of preimpregnated fiber tape used in the weft layer, dimensionless; C is the layer coefficient, dimensionless; ε2 is the elongation at break of the weft tape; d2 is the warp of the corresponding weft layer reinforcement layer, in mm.

[0066] The layer coefficient C can be determined according to the above table. According to the above formula, the number of layers of prepreg fiber tape used in the weft layer can also be calculated. The number of layers used must not be less than the n2 value required by the calculation.

[0067] It can be seen from the above formula that when the prepreg warp tape and the prepreg weft tape use the same technical parameters to design the prepreg warp and weft mesh fiber tape layer 3, because the calculated values ​​of d1 and d2 are relatively close, P2 is about twice P1. Therefore, when designing the product, the configuration of the prepreg warp tape and the prepreg weft tape can be adjusted according to the calculation results. For the convenience of production and processing, the prepreg warp tape and the prepreg weft tape can also be determined by using the same number of layers and the same parameters.

[0068] The above calculations have confirmed the number of tape layers used, but the reinforcement layer length L1 (i.e., the length of the pre-impregnated warp and weft fiber tape layer) that affects the pressure of the reinforcement layer product has not been clarified. The above calculations can only show that the reinforcement layer itself can meet the circumferential and axial pressure. Because the pipe fittings are composite structures, the composite conditions of the pipe fittings directly determine the comprehensive performance of the pipe during the pressure bearing process. According to the barrel theory, the minimum interface shear force (N / mm) is the limiting point. The circumferential pressure is not affected by the composite of the layers of the pipe fittings because the fibers are continuous structures (composite here refers to the composite between the reinforcement layer, the hydrogen barrier layer, and the inner and outer layers of the pipe fittings). The interface shear force of the axial pressure of the pipe fittings directly determines the length of the reinforcement layer L1. The interface shear force between the reinforcement layer and the hydrogen barrier layer is selected as the calculation basis for the pipe fittings manufactured in this way. The length calculation of L1 (mm) can be calculated using the following formula:

[0069]

[0070] Among them: P is the designed axial bearing strength, in MPa; r is the corresponding inner radius of the pipe, in mm; d3 is the outer diameter at the calculated interface, in mm; C is the design coefficient, which can be taken as 1.2 and is dimensionless; b is the peel strength at the calculated interface; ε is the elongation at break of the weft tape.

[0071] In the present invention, the hydrogen barrier layer uses plasticized aluminum foil, which can be made of pure aluminum or alloy aluminum. The aluminum foil has natural gas permeability resistance. The thickness of the aluminum foil barrier layer of the present invention is greater than 0.05 mm, and the number of layers is at least two, which can fully meet the hydrogen permeability performance requirements. Because the width L2 of the plasticized aluminum foil in the present invention is mainly determined based on the hydrogen permeability coefficient of the pipe, the wall thickness of the pipe, and the hydrogen partial pressure inside and outside the pipe, the width of the plasticized aluminum foil in the present invention is the same as the length L1 of the reinforcement layer. The present invention can be applied to the design requirements of various reinforcing fibers and various pipe base materials.

[0072] The present invention is further described below in conjunction with specific embodiments.

[0073] Taking dn200*4.0MPa polyethylene pipe fittings as an example, the parameters of the raw materials are as follows:

[0074] 1. The thickness of a single pre-impregnated fiber layer is 0.3mm, the fiber material is glass fiber, the tensile strength is ≥800MPa, and the pre-impregnated base resin is polyethylene;

[0075] 2. The main raw material of the pipe fittings is PE100 grade high-density polyethylene, containing a small amount of carbon black or pigment;

[0076] 3. The thickness of the aluminum foil before lamination is 0.05mm, and the adhesive resin for lamination is maleic anhydride grafted polyethylene material. The peel strength between the lamination layer and the aluminum foil is ≥10N / mm;

[0077] 4. The calculated value of the peel strength at the interface between the pressure-bearing reinforcement layer and the hydrogen barrier layer is 10N / mm.

[0078] The product design calculation is as follows:

[0079] The distance between the hydrogen barrier layer and the inner wall of the pipe is designed to be 5mm. The pressure-bearing reinforcement layer is designed with the same number of pre-impregnated warp tapes and pre-impregnated weft tapes in a cross design (i.e. one layer of warp tape and one layer of weft tape are reciprocatingly compounded), and the axial annular pressure strength is calculated to be 4.0MPa.

[0080] After calculation, at least 6 layers of circumferential fiber belts are required, and at least 3 layers of axial fiber belts are required. In actual production, 6 layers of circumferential fiber belts and 6 layers of axial fiber belts can be combined for easy production and processing.

[0081] For the length L1 of the pressure-bearing reinforcement layer, assuming that the inner diameter of the pipe is 160 mm, the inner radius is 80 mm. Based on this calculation, the length value of L1 is at least 87.0255 mm.

[0082] According to this design, the laminated aluminum foil layer is designed to be 0.05mm*2 layers with a length of 87.0255mm.

[0083] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A high-pressure hydrogen transmission composite electric fusion pipe fitting, characterized in that: It comprises a non-metallic hydrogen transport pipe, adjacent sections of the non-metallic hydrogen transport pipe are connected by a pipe joint, and the pipe joint is sleeved on the connecting ends of two adjacent non-metallic hydrogen transport pipes; a pre-impregnated warp and weft mesh fiber strip layer is arranged in the pipe joint, and a plasticized aluminum foil as a hydrogen barrier layer is arranged on the inner side of the pre-impregnated warp and weft mesh fiber strip layer.

2. The high-pressure hydrogen transport composite electric fusion pipe fitting according to claim 1, characterized in that: The pipe joint is an annular tubular structure having an annular storage space, in which the pre-impregnated warp and weft mesh fiber strip layer and the plasticized aluminum foil are both placed, and the pre-impregnated warp and weft mesh fiber strip layer serves as a reinforcing layer of the pressure-bearing structure.

3. The high-pressure hydrogen transport composite electric fusion pipe fitting according to claim 1, characterized in that: The pre-impregnated warp and weft mesh fiber tape layer is formed by compounding a pre-impregnated warp tape and a pre-impregnated weft tape, and the warp of the pre-impregnated warp tape and the weft of the pre-impregnated weft tape are arranged vertically at an angle of 90°.

4. The high-pressure hydrogen transport composite electric fusion pipe fitting according to claim 3 is characterized in that: The prepreg warp tape is perpendicular to the axial direction of the non-metallic hydrogen transport pipe, and the prepreg weft tape is parallel to the axial direction of the non-metallic hydrogen transport pipe.

5. The high-pressure hydrogen transport composite electric fusion pipe fitting according to claim 1, characterized in that: The laminar aluminum foil is attached to the pre-impregnated warp and weft mesh fiber strip layer, and both the laminar aluminum foil and the pre-impregnated warp and weft mesh fiber strip layer are arranged in a ring shape; a laminar layer is coated on the outer side of the laminar aluminum foil, and the laminar layer is made of polymer bonding resin.

6. The high-pressure hydrogen transport composite electric fusion pipe fitting according to claim 1, characterized in that: The pipe joint is connected to the non-metallic hydrogen transmission pipe by electric fusion; a resistance wire is arranged on the inner wall of the pipe joint, a terminal is arranged on the outer periphery of the pipe joint, a connecting wire is arranged inside the terminal to connect with the resistance wire, and the terminal is connected to an external power supply device.

7. The high-pressure hydrogen transport composite electric fusion pipe fitting according to claim 1, characterized in that: The pipe joint is provided with an outer layer structure corresponding to the outer side of the pre-impregnated warp and weft mesh fiber strip layer, and the outer layer structure is coated on the outer side of the pre-impregnated warp and weft mesh fiber strip layer; the material of the pipe joint and the outer layer structure is the same as the outer layer material of the non-metallic hydrogen transport pipe.

8. The high-pressure hydrogen transmission composite electric fusion pipe fitting according to claim 1, characterized in that: The number of layers of the prepreg warp tape is obtained by the following formula: Among them: P1 is the calculated circumferential compressive strength of the warp layer; p1 is the strength of the single-layer warp prepreg fiber tape; e1 is the thickness of the single-layer warp prepreg fiber tape; n1 is the number of layers of prepreg fiber tape used in the warp layer; C is the layer coefficient; ε1 is the elongation at break of the warp tape; d1 is the corresponding warp in the reinforcement layer.

9. The high-pressure hydrogen transmission composite electric fusion pipe fitting according to claim 1, characterized in that: The number of layers of the prepreg weft tape is obtained by the following formula: Among them: P2 is the calculated axial compressive strength of the weft layer, p2 is the strength of the single-layer weft preimpregnated fiber tape; e2 is the thickness of the single-layer weft preimpregnated fiber tape; n2 is the number of layers of preimpregnated fiber tape used in the weft layer; C is the layer coefficient; ε2 is the elongation at break of the weft tape; d2 is the corresponding weft layer reinforcement layer center warp.

10. The high-pressure hydrogen transport composite electric fusion pipe fitting according to claim 1, characterized in that: The length of the pre-impregnated warp and weft fiber tape layer L1 is obtained by the following formula: Where: P is the designed axial bearing strength; r is the corresponding inner radius of the pipe; d3 is the outer diameter at the calculated interface; C is the design coefficient; b is the peel strength at the calculated interface; ε is the elongation at break of the weft tape.

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