Gas delivery pipe with high barrier property and pipeline connector

Abstract

The invention relates to the technical field of pipe fittings, in particular to a high-barrier-property gas conveying pipe which comprises a pipe fitting body and two sealing sleeves, the pipe fitting body comprises a pipe fitting inner layer, a pipe fitting barrier layer, a pipe fitting pressure bearing layer and a pipe fitting outer layer which are sequentially connected from inside to outside, and each sealing sleeve comprises a shell and a barrier piece located in the shell. The two shells are fixed to the two ends of the pipe fitting body in the axial direction respectively, and at least one part of the projection plane, in the axial direction of the pipe fitting body, of the pipe fitting inner layer is located in the projection plane, in the axial direction of the pipe fitting body, of the blocking piece. The sealing sleeve can be arranged at the end of the pipe fitting body in a sleeving mode, the blocking piece can block most of hydrogen molecules permeating out of the end face of the pipe fitting inner layer, permeation of hydrogen at the end of the pipe fitting is effectively reduced, the conveying efficiency is improved, the sealing sleeve can be independently produced and conveyed to an assembly site, and then the pipe fitting body and the sealing sleeve are connected. And processing procedures are reduced.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of pipe fittings, and more particularly to a high-barrier gas conveying pipe and a pipe connecting body. BACKGROUND

[0002] Hydrogen is a highly flammable, colorless, odorless, tasteless and hardly soluble in water gas. In the pipeline for conveying natural gas and hydrogen, the hydrogen conveying pipeline currently mainly uses steel pipes. However, due to the small molecular weight of hydrogen and other gases, they can easily enter the inside of the pipeline material. The metal material will have a decrease in mechanical properties, an accelerated crack propagation speed and a decrease in fracture toughness, resulting in hydrogen embrittlement, which will damage the pipeline.

[0003] Therefore, the prior art has many composite pipes with barrier layers to replace steel pipes as hydrogen conveying pipes, which can reduce the occurrence of hydrogen embrittlement. For example, CN116677837A discloses a fiber-reinforced composite inner lining flexible pipe for hydrogen conveying. A hydrogen gas permeation resistant metal lining layer is additionally provided inside the plastic lining layer. Since the hydrogen gas permeation resistance of the metal lining layer is better than that of thermoplastic plastic, the hydrogen gas permeation rate of the hydrogen gas permeation resistant metal lining layer as the innermost layer of the pipeline is lower than that of the thermoplastic plastic as the innermost layer of the pipeline. This can effectively prevent hydrogen from directly permeating into the high-density polymer of the plastic lining layer, better protect the plastic lining layer, and better improve the hydrogen gas permeation resistance.

[0004] Although the pipe fittings of the prior art have good barrier properties, they are usually made in segments during production. When assembled, the two pipe segments need to be connected using a joint. The hydrogen conveying pipe of the prior art lacks barrier at the end connected to the joint, and hydrogen is prone to permeate at the connected end, resulting in hydrogen leakage and reducing the conveying efficiency. SUMMARY

[0005] The present application aims to overcome the problem of the lack of barrier at the end connected to the joint of the hydrogen conveying pipeline of the prior art, resulting in hydrogen leakage. The present application provides a high-barrier gas conveying pipe to enhance the barrier property at the pipe connection, reduce hydrogen permeation, and ensure the hydrogen conveying efficiency.

[0006] To solve the above technical problems, the technical solution adopted by the present application is as follows: The application provides a high-barrier gas conveying pipe, which comprises a pipe body and two sealing sleeves.

[0007] The pipe body is internally provided with a pipe barrier layer, the pipe barrier layer has high density and can effectively block hydrogen molecules and prevent the hydrogen molecules from penetrating out of the pipe body.

[0008] Further, the outer wall of the pipe outer layer is provided with an annular first step portion, the inner wall of the pipe inner layer is provided with an annular second step portion, the shell comprises an outer ring and an inner ring connected with the outer ring, the outer ring is provided with a first protruding portion for being fixed in the first step portion, and the inner ring is provided with a second protruding portion for being fixed in the second step portion.

[0009] Further, the barrier piece is at least partially located in the first protruding portion and the second protruding portion.

[0010] Further, the pipe barrier layer comprises a PA layer located outside the pipe inner layer and an aluminum plate layer located outside the PA layer.

[0011] Further, the pipe inner layer and the inner ring are made of the same material, the pipe outer layer and the outer ring are made of the same material, the first protruding part and the first step part are glued or fused, and the second protruding part and the second step part are glued or fused. Since the pipe inner layer and the inner ring are made of the same material, and the pipe outer layer and the outer ring are made of the same material, the gluing or fusing is facilitated.

[0012] The high-barrier pipe connecting body comprises two high-barrier gas conveying pipes and a connector main body, an inner wall of the connector main body is provided with an annular third protruding part, the third protruding part is used for abutting against the sealing sleeve, and the inner wall of the connector main body is fused with the outer wall of the sealing sleeve and the outer wall of the pipe main body. The third protruding part is used for positioning two sealing sleeves, facilitating connection, and the connection is achieved in a fusing mode, so that a seamless and continuous molecular-level combination is formed between the connector main body, the pipe main body and the sealing sleeve, the sealing property is good, and hydrogen leakage is prevented.

[0013] Further, the connector main body is internally provided with a composite layer, the composite layer comprises a connector barrier layer, a connector adhesive layer and a connector pressure bearing layer which are sequentially connected from inside to outside, and the connector barrier layer is located on the outer side in the radial direction of the third protruding part. The connector main body is also provided with the connector barrier layer on the outer side in the radial direction of the third protruding part, so that the barrier layer can block a small amount of hydrogen molecules penetrating from the pipe connection, and the hydrogen molecule penetration is further reduced.

[0014] Further, the connector main body is internally provided with two annular barrier plates, the axis of the annular barrier plate is collinear with the axis of the connector main body, and the two annular barrier plates abut against two ends of the connector barrier layer in the axial direction. The annular barrier plate blocks the movement of hydrogen molecules in the axial direction, and a semi-enclosed structure is formed between the annular barrier plate and the connector barrier layer, so that the hydrogen blocking capacity of the entire connector main body is better.

[0015] Further, the annular barrier plate extends to the inner surface of the connector main body. The gap between the annular barrier plate and the pipe main body is reduced, the hydrogen blocking capacity is better, and the hydrogen leakage is reduced to a greater extent.

[0016] Further, the joint body further comprises two heating assemblies, two wire cavities are formed in the outer wall of the joint body, each of the heating assemblies comprises a wire post and a heating wire, the two wire posts are fixed in the two wire cavities respectively, the heating wire is embedded on the side close to the inner wall of the joint body, the heating wire is spirally wound along the axis of the joint body, and the wire post is connected with one end of the heating wire. The joint body is an electric fusion joint, compared with a hot melt socket, the electric fusion connection method is more convenient to operate, and is more suitable for space and environment, in the specific operation process, the operator connects the wire post with a power supply, the heating wire generates heat after being electrified, melts the inner wall of the joint body, the outer wall of the sealing sleeve and the outer wall of the pipe body, and after cooling, the joint body can be bonded with the pipe body and the sealing sleeve.

[0017] Compared with the prior art, the beneficial effects of the present application are: 1. The sealing sleeve can be sleeved on the end portion of the pipe body, the blocking piece can block most of the hydrogen molecules permeating from the end face of the pipe inner layer, can effectively reduce the permeation of hydrogen at the end portion of the pipe, improve the conveying efficiency, the sealing sleeve can be produced separately, transported to the assembly site, and then connected between the pipe body and the sealing sleeve, thereby reducing the processing procedure. 2. The pipe blocking layer is composed of a PA layer and an aluminum plate layer, and has high blocking ability and better blocking effect on hydrogen molecules. 3. The joint body is internally provided with a joint blocking layer and an annular blocking plate, the joint blocking layer and the annular blocking plate surround a semi-enclosed cavity, and block a small amount of hydrogen molecules permeating from the pipe connection, thereby further reducing the permeation of hydrogen molecules. 4. The joint body further comprises two heating assemblies, and the joint body adopts electric fusion connection, which is more convenient to operate and has stronger adaptability to space and environment. BRIEF DESCRIPTION OF DRAWINGS

[0018] Figure 1 It is a sectional view of a high-barrier gas conveying pipe along the plane where the axis is located. Figure 2 It is Figure 1 the local enlarged view of position A. Figure 3 It is a structural schematic view of a high-barrier pipe connecting body. Figure 4 It is a structural schematic view of a joint body.

[0019] In the drawings: 100, pipe body; 110, inner layer of pipe; 111, second step portion; 120, barrier layer of pipe; 121, PA layer; 122, aluminum plate layer; 130, pressure bearing layer of pipe; 140, outer layer of pipe; 141, first step portion; 200, sealing sleeve; 210, outer ring; 211, first protruding portion; 220, inner ring; 221, second protruding portion; 230, barrier piece; 300, joint body; 310, barrier layer of joint; 320, pressure bearing layer of joint; 330, third protruding portion; 340, annular barrier plate; 350, heating assembly; 351, terminal post; 352, heating wire; 353, high-temperature-resistant insulating wire sleeve. DETAILED DESCRIPTION

[0020] The application will be further described below in conjunction with the specific embodiments. The drawings are only used for exemplary description, and the representation is only a schematic diagram, not a physical diagram, and cannot be understood as a limitation on the patent. In order to better illustrate the embodiments of the application, some components in the drawings will be omitted, enlarged or reduced, and do not represent the actual size of the product. It is understandable for those skilled in the art that some well-known structures and their descriptions in the drawings can be omitted.

[0021] The same or similar reference numerals in the drawings of the embodiments of the application correspond to the same or similar components; in the description of the application, it should be understood that the orientations or positional relationships indicated by the terms "upper", "lower", "left", "right" and the like are based on the orientations or positional relationships shown in the drawings, and are only for the convenience of describing the application and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, therefore the terms describing the positional relationship in the drawings are only used for exemplary description, and cannot be understood as a limitation on the patent, and for those skilled in the art, the specific meanings of the above terms can be understood according to the specific circumstances.

[0022] In the present application, unless otherwise explicitly specified and limited, the terms "connection", "fixation", "fitting" and the like should be understood broadly, for example, can be fixedly connected, or can be detachably connected, or can be integrated; can be mechanically connected, or can be electrically connected; can be directly connected, or can be indirectly connected through an intermediate medium, can be the internal communication of two elements or the interaction relationship between two elements, unless otherwise explicitly limited. For those skilled in the art, the specific meanings of the above terms in the present application can be understood according to the specific circumstances.

[0023] In the description of this specification, references to terms such as "embodiment" indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the invention. In this specification, illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0024] Example 1 This embodiment is a first embodiment of a high-barrier gas delivery pipe, such as... Figure 1 As shown, it includes the pipe body 100 and two sealing sleeves 200, as... Figure 2 As shown, the pipe fitting body 100 includes, from the inside out, an inner pipe fitting layer 110, a pipe fitting barrier layer 120, a pipe fitting pressure-bearing layer 130, and an outer pipe fitting layer 140. The sealing sleeve 200 includes a shell and a barrier element 230 located inside the shell. The two shells are respectively fixed to the two ends of the pipe fitting body 100 in the axial direction. The shell includes an outer ring 210 and an inner ring 220 connected to the inner side of the outer ring 210. The outer wall of the outer pipe fitting layer 140 is provided with an annular first step portion 141, and the inner wall of the inner pipe fitting layer 110 is provided with an annular second step portion 111. The outer ring 210 is provided with a part for fixing the first step portion 141. The first protrusion 211 inside the step portion 141, the inner ring 220 is provided with a second protrusion 221 for fixing inside the second step portion 111, both the first protrusion 211 and the second protrusion 221 are annular, the outer side of the barrier member 230 in the radial direction extends along the axial direction of the pipe body 100 into the first protrusion 211, the inner side of the barrier member 230 in the radial direction extends along the axial direction of the pipe body 100 into the second protrusion 221, a portion of the projection surface of the inner layer 110 of the pipe body 100 in the axial direction is located within the projection surface of the barrier member 230 in the axial direction of the pipe body 100.

[0025] The working principle of this embodiment is as follows: This invention discloses a high-barrier gas delivery pipe. The pipe body 100 has an internal barrier layer 120. This barrier layer 120 has a high density, effectively preventing hydrogen molecules from permeating out of the pipe body. Since the inner layer 110 has a relatively low density, hydrogen molecules can move within it. In existing delivery pipes, hydrogen molecules easily overflow from the end face of the inner layer 110. In this embodiment, a sealing sleeve 200 is installed at the end of the pipe body 100. The outer shell of the sealing sleeve 200 is used to connect with the pipe body 100. Next, the sealing sleeve 200 is equipped with a barrier 230 inside. The barrier 230 also has a high density. When hydrogen molecules want to permeate out from the end face of the inner layer 110 of the pipe, most of them will be blocked by the barrier 230 inside the sealing sleeve 200. Only a small part will overflow from the shell. The barrier 230 can effectively reduce the permeation of hydrogen at the end of the pipe and improve the conveying efficiency. In addition, the sealing sleeve 200 can be produced separately and transported to the assembly site for connection between the pipe body 100 and the sealing sleeve 200, reducing processing steps.

[0026] The beneficial effects of this invention are as follows: The sealing sleeve 200 can be fitted onto the end of the pipe body 100. The barrier 230 can block most of the hydrogen molecules that permeate from the end face of the inner layer 110 of the pipe, effectively reducing hydrogen permeation at the end of the pipe and improving the conveying efficiency. The sealing sleeve 200 can be produced separately and transported to the assembly site for connection between the pipe body 100 and the sealing sleeve 200, reducing processing steps. The first protrusion 211 and the second protrusion 221 are respectively installed in the first step and the second step, respectively, increasing the connection surface between the sealing sleeve 200 and the pipe body 100. The sealing sleeve 200 is more stably installed on the end of the pipe body 100. The outer and inner sides of the barrier 230 extend into the first protrusion 211 and the second protrusion 221, respectively, increasing the area of ​​the barrier 230. The barrier 230 can block hydrogen molecules from different directions, resulting in a better blocking effect.

[0027] In addition, the main body 100 of the pipe fitting may have a sealing sleeve 200 installed on only one end, and no sealing sleeve 200 installed on the other end.

[0028] Example 2 This embodiment is a second embodiment of a high-barrier gas delivery pipe. This embodiment is similar to the first embodiment, except that, as shown in the example... Figure 2As shown, the pipe inner layer 110 is made of PVC-O material and is made by extrusion molding, which can accurately control the inner diameter of the pipe body 100. The pipe barrier layer 120 includes a PA layer 121 outside the pipe inner layer 110 and an aluminum plate layer 122 outside the PA layer 121. The PA layer 121 is also called a polyamide layer or a nylon layer. The PA layer 121 is obtained by extrusion molding and is bonded with the pipe inner layer 110. The PA layer 121 can be made of PA6, PA612, PA11 or other similar materials according to the pressure borne by the pipe body 100.

[0029] The aluminum plate layer 122 is subjected to anodic oxidation treatment, is wound on the outer wall of the PA layer 121, and is bonded between the pipe inner layer 110 by using glue.

[0030] The pipe pressure bearing layer 130 is made of high-density polyethylene (HDPE) and is laminated with an aramid fabric layer to realize interlayer bonding by hot pressing or adhesive bonding. In addition, the pipe pressure bearing layer 130 can also be a steel wire belt, a glass fiber mesh, etc.

[0031] The pipe outer layer 140 is made of HDPE material and is obtained by extrusion molding. The outer ring 210 is made of HDPE material and is obtained by co-injection molding, i.e., the inner ring 220 is first injection molded and then the outer ring 210 is injection molded.

[0032] When the sealing sleeve 200 is installed on the pipe body 100, the first protruding part 211 is bonded with the first stepped part 141 by using glue, and the second protruding part 221 is fused with the second stepped part 111. In addition, the second protruding part 221 and the second stepped part 111 can also be bonded by using glue.

[0033] Example Three This embodiment is a first embodiment of a high-barrier pipe connecting body. This embodiment is similar to Example Two, except that, as shown in Figure 3 , it includes two high-barrier gas conveying pipes and a joint body 300 as described in Example Two, as shown in Figure 4 , the joint body 300 is provided with a composite layer inside, which includes a joint barrier layer 310, an adhesive layer and a joint pressure bearing layer 320 connected in sequence from inside to outside. The joint body 300 is made of HDPE material. The joint barrier layer 310 is a multi-layer aluminum belt layer subjected to anodic oxidation. The joint pressure bearing layer 320 is made of UHMW-PE material and is formed by injection molding outside the joint barrier layer 310. The outer layer is made of HDPE material. The joint body 300 is also provided with the joint barrier layer 310, which can block a small amount of hydrogen molecules penetrating from the pipe connecting part, thereby further reducing the permeation of hydrogen molecules.

[0034] As shown in Figure 3 and Figure 4As shown, the joint body 300 is provided with a third annular protrusion 330, the two sides of the third annular protrusion 330 abut the two sealing sleeves 200, and the inner wall of the joint body 300 is fused with the outer wall of the sealing sleeve 200 and the outer wall of the pipe body 100. Here, electric fusion or hot melt socket can be used. The third protrusion 330 is used to position the two sealing sleeves 200, facilitate connection, and adopt a fusion method for connection. The joint body 300, the pipe body 100, and the sealing sleeve 200 form a seamless and continuous molecular-level combination, which is good in sealing and prevents hydrogen leakage.

[0035] As shown in the drawings, Figure 4 The joint body 300 is also provided with two annular baffles 340, the axis of the annular baffles 340 is collinear with the axis of the joint body 300, the inner side of the annular baffles 340 extends to the inner surface of the joint body 300, and the two annular baffles 340 abut the two ends of the joint barrier layer 310 in the axial direction. The annular baffles 340 block the axial movement of hydrogen molecules, and a semi-enclosed structure is formed between the annular baffles 340 and the joint barrier layer 310. The entire joint body 300 has better hydrogen blocking ability.

[0036] Embodiment Four This embodiment is a fourth embodiment of a high-barrier pipe connector, which is similar to embodiment three, except that, as shown in the drawings, Figure 4 The joint body 300 also includes two heating assemblies 350, the outer wall of the joint body 300 is provided with two wiring cavities, each heating assembly 350 includes a wiring post 351 and a heating wire 352, the two wiring posts 351 are fixed in the two wiring cavities, the heating wire 352 is embedded in the joint body 300 near the inner wall of the joint body 300, the heating wire 352 is wound in a spiral shape along the axis of the joint body 300, the wiring post 351 is connected to one end of the heating wire 352, part of the heating wire 352 is distributed outside the pipe body 100, and the other part is distributed outside the sealing sleeve 200. The two annular baffles 340 are each provided with a small hole for the heating wire 352 to pass through, and the part of the heating wire 352 outside the annular baffle 340 is sleeved with a high-temperature-resistant insulating wire sleeve 353 to prevent the heating wire 352 from directly contacting the annular baffle 340 and causing a short circuit.

[0037] The joint body 300 is an electric fusion joint, compared with a hot melt socket, the method of electric fusion connection is more convenient, and the adaptability to space and environment is stronger, in the specific operation process, the operator connects the terminal post 351 with the power supply, the heating wire 352 generates heat after being electrified, melts the inner wall of the joint body 300 and the outer wall of the sealing sleeve 200 and the outer wall of the pipe body 100, after cooling, the joint body 300 can be bonded with the pipe body 100 and the sealing sleeve 200.

[0038] In the specific contents of the above specific embodiments, each technical feature can be combined arbitrarily without contradiction, in order to make the description simple, all possible combinations of the above technical features are not described, however, as long as the combination of the technical features does not exist contradiction, it should be considered that it is within the scope of the present application.

[0039] Obviously, the above embodiments of the present application are only examples for clearly illustrating the present application, and are not intended to limit the implementation modes of the present application. Any modification, equivalent replacement and improvement made on the basis of the above description for those skilled in the art should be included in the protection scope of the present application.

Claims

1. A high-barrier gas delivery pipe, comprising a pipe body (100), wherein the pipe body (100) comprises, from the inside out, an inner pipe layer (110), a pipe barrier layer (120), a pipe pressure-bearing layer (130), and a pipe outer layer (140), characterized in that, It also includes two sealing sleeves (200), each sealing sleeve (200) comprising a housing and a barrier (230) located inside the housing. The two housings are respectively fixed to both ends of the pipe body (100) in the axial direction. At least a portion of the projection surface of the inner layer (110) of the pipe body (100) in the axial direction is located within the projection surface of the barrier (230) of the pipe body (100) in the axial direction.

2. The high-barrier gas delivery pipe according to claim 1, characterized in that, The outer wall of the outer layer (140) of the pipe fitting is provided with an annular first step portion (141), and the inner wall of the inner layer (110) of the pipe fitting is provided with an annular second step portion (111). The housing includes an outer ring (210) and an inner ring (220) connected to the outer ring (210). The outer ring (210) is provided with a first protrusion (211) for fixing in the first step portion (141), and the inner ring (220) is provided with a second protrusion (221) for fixing in the second step portion (111).

3. The high-barrier gas delivery pipe according to claim 2, characterized in that, The barrier (230) is at least partially located within the first protrusion (211); the barrier (230) is at least partially located within the second protrusion (221).

4. A high-barrier gas delivery pipe according to claim 2, characterized in that, The pipe fitting barrier layer (120) includes a PA layer (121) located outside the inner layer (110) of the pipe fitting and an aluminum plate layer (122) bonded to the outside of the PA layer (121) by adhesive.

5. A high-barrier gas delivery pipe according to claim 4, characterized in that, The inner layer (110) of the pipe fitting is made of the same material as the inner ring (220), the outer layer (140) of the pipe fitting is made of the same material as the outer ring (210), the first protrusion (211) is bonded or fused to the first step (141), and the second protrusion (221) is bonded or fused to the second step (111).

6. A high-barrier pipe connector, comprising the high-barrier gas delivery pipe according to any one of claims 1-5, characterized in that, It also includes a connector body (300), the inner wall of which is provided with an annular third protrusion (330), the third protrusion (330) being used to abut against the sealing sleeve (200), and the inner wall of the connector body (300) being fused with the outer wall of the sealing sleeve (200) and the outer wall of the pipe fitting body (100).

7. A high-barrier pipe connector according to claim 6, characterized in that, The connector body (300) has a composite layer inside, which includes a connector barrier layer (310) and a connector pressure-bearing layer (320) connected sequentially from the inside to the outside. The connector barrier layer (310) is located on the outer side of the third protrusion (330) in the radial direction.

8. A high-barrier pipe connector according to claim 7, characterized in that, The connector body (300) is also provided with two annular baffles (340), the axis of the annular baffles (340) is collinear with the axis of the connector body (300), and the two annular baffles (340) respectively abut against the two ends of the connector baffle layer (310) in the axial direction.

9. A high-barrier pipe connector according to claim 8, characterized in that, The inner side of the annular barrier plate (340) extends to the inner surface of the connector body (300).

10. A high-barrier pipe connector according to claim 6, characterized in that, The connector body (300) also includes two heating components (350). The outer wall of the connector body (300) has two wiring cavities. Each heating component (350) includes a terminal (351) and a heating wire (352). The two terminals (351) are fixed in the two wiring cavities respectively. The heating wire (352) is embedded in the connector body (300) on one side near the inner wall of the connector body (300). The heating wire (352) is wound in a spiral shape along the axis of the connector body (300). The terminal (351) is connected to one end of the heating wire (352).

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