Shaft ring combined type high-strength composite pipeline joint structure

Abstract

The invention relates to the technical field of nonmetal pipelines, and discloses a shaft ring combined type high-strength composite pipeline joint structure which comprises a first pipeline, a second pipeline and an electric smelting pipe fitting. The first pipeline is provided with a first flow channel, the first pipeline is provided with a first end in the extending direction of the first flow channel, and the first end is provided with a first connecting part; the second pipeline is provided with a second flow channel, the second pipeline is provided with a second end in the extending direction of the second flow channel, and the second end is provided with a second connecting part; the electric melting pipe fitting is arranged on the first connecting part and the second connecting part in a sleeving manner so as to communicate the first flow channel with the second flow channel; wherein at least one of the first end, the second end and the electric smelting pipe fitting is sleeved with a reinforcing piece, and the reinforcing piece is suitable for limiting the radial displacement of the first end, the second end or the electric smelting pipe fitting. According to the joint structure, the connection reliability is improved.

Description

Technical Field

[0001] The present application relates to the technical field of non-metallic pipelines, and in particular to a shaft-ring combined high-strength composite pipeline joint structure. Background Art

[0002] Polyethylene and its composite pipes are characterized by good flexibility, corrosion resistance, and non-contamination of the transported medium. They are widely used in nuclear power plant cooling water transportation, oil and gas transportation, and other harsh working conditions with high pressure levels and high safety requirements. Electric fusion joints are widely used for connecting non-metallic composite pipes due to their advantages such as corrosion resistance, long service life, low leakage, simple operation, and high reliability. Pipes used in harsh working conditions have high working pressures and require higher safety, which places higher demands on the strength of the pipeline system. Studies have shown that with the development of reinforced thermoplastic plastic pipes with continuous glass fiber or steel wire skeletons as the reinforcement layer, the mechanical strength of polyethylene and its composite pipes has been significantly improved. Therefore, the safety of plastic piping systems mainly depends on the strength of electric fusion joints. However, the structural reinforcement methods for electric fusion joints in non-metallic piping systems are relatively limited.

[0003] In the existing technology, the strength of electric fusion joints has become a key limiting factor in improving the performance of polyethylene and its composite pipeline systems. Therefore, how to improve the strength of the joints has become a technical problem that urgently needs to be solved today. Summary of the Invention

[0004] The present application provides a shaft-ring combined high-strength composite pipe joint structure, which improves connection reliability.

[0005] In order to achieve the above objectives, the main technical solutions adopted in this application include:

[0006] In a first aspect, an embodiment of the present application provides a joint structure, comprising a first pipe, a second pipe and an electric fusion pipe fitting; the first pipe has a first flow channel, and along the extension direction of the first flow channel, the first pipe has a first end, and the first end is provided with a first connection portion; the second pipe has a second flow channel, and along the extension direction of the second flow channel, the second pipe has a second end, and the second end is provided with a second connection portion; the electric fusion pipe fitting is sleeved on the first connection portion and the second connection portion to connect the first flow channel and the second flow channel; wherein, at least one of the first end, the second end and the electric fusion pipe fitting is sleeved with a reinforcement member, and the reinforcement member is suitable for limiting the radial displacement of the first end, the second end or the electric fusion pipe fitting.

[0007] The joint structure proposed in the application embodiment has a reinforcing member that improves the deformation resistance of the weak parts of the pipe (such as the connection end) through physical constraint, which can effectively resist the radial expansion trend of the pipeline caused by internal pressure, and avoid pipe rupture or connection failure caused by local stress concentration. The reinforcing member can evenly transfer the external load to the entire pipe, reduce the probability of stress concentration, greatly enhance the pressure-bearing effect of the joint structure, and improve the connection reliability.

[0008] Optionally, there are multiple reinforcement pieces, including a first reinforcement piece, a second reinforcement piece and a third reinforcement piece. The electric fusion pipe piece is provided with the first reinforcement piece, the first end is provided with the second reinforcement piece, and the second end is provided with the third reinforcement piece.

[0009] In the above scheme, the first reinforcement member is sleeved on the outside of the electric fusion pipe fitting, and the first reinforcement member can play a role in limiting the axial expansion of the electric fusion pipe fitting. The second reinforcement member is sleeved on the outside of the first end, and the second reinforcement member can play a role in limiting the expansion of the first pipe end. The third reinforcement member is sleeved on the outside of the second end, and the third reinforcement member can play a role in limiting the expansion of the second pipe end. The electric fusion pipe fitting, the first pipe and the second pipe are reinforced by the first reinforcement member, the second reinforcement member and the third reinforcement member respectively, thereby realizing stress redistribution of the joint structure and improving the connection reliability of the joint structure.

[0010] Optionally, along the axial direction of the electrofusion pipe, the length of the first reinforcement is D1, and the length of the electrofusion pipe is D2, satisfying D1≥0.1D2.

[0011] In the above scheme, sufficient length can ensure that the reinforcement covers the main stress-bearing area of the pipe fitting, better disperses stress, and reduces the deformation of the electric fusion pipe fitting. It can be understood that since the axial length of the first reinforcement along the electric fusion pipe fitting in this scheme meets the above range with the length of the electric fusion pipe fitting, on the one hand, it can improve the bending stiffness of the electric fusion pipe fitting and improve the connection reliability. On the other hand, it can avoid the first reinforcement being too large, thereby reducing costs.

[0012] Optionally, the outer surface of the first reinforcement member is provided with a first reinforcement rib extending along the circumferential direction of the electrofusion pipe, and along the radial direction of the electrofusion pipe, the first reinforcement rib protrudes from the outer surface of the first reinforcement member.

[0013] In the above scheme, the first reinforcement rib is used to increase the stiffness and strength of the first reinforcement and reduce the deformation probability of the first reinforcement. That is, when the first reinforcement is subjected to internal or external pressure, the first reinforcement rib can better disperse the stress and thus better resist deformation. In addition, when the first reinforcement is subjected to internal pressure, the circumferential stress is one of the main stresses. The circumferentially extending first reinforcement rib significantly improves the ability of the first reinforcement to resist circumferential deformation by increasing the moment of inertia of the section, thereby preventing expansion or rupture caused by pressure, and thereby realizing circumferential reinforcement of the electric fusion pipe fitting through the first reinforcement.

[0014] Optionally, along the radial direction of the electrofusion pipe, the thickness of the first reinforcement piece is H1, and along the axial direction of the electrofusion pipe, the thickness of the first reinforcement rib is H2; and H1≤H2≤2H1 is satisfied.

[0015] In the above scheme, since the thickness of the first reinforcing rib and the thickness of the first reinforcement meet the above range, on the one hand, the bending stiffness and deformation resistance of the first reinforcement can be improved, and on the other hand, the problem of uneven cooling shrinkage, increased internal stress, etc. that may occur during injection molding or extrusion molding due to the large difference between the thickness of the first reinforcing rib and the thickness of the first reinforcement is reduced.

[0016] Optionally, the outer surface of the second reinforcement member is provided with a second reinforcement rib extending along the circumference of the first pipe, and along the radial direction of the first pipe, the second reinforcement rib protrudes from the outer surface of the second reinforcement member;

[0017] The outer surface of the third reinforcement piece is provided with a third reinforcement rib extending along the circumferential direction of the second pipe. In the radial direction of the second pipe, the third reinforcement rib protrudes from the outer surface of the third reinforcement piece.

[0018] In the above scheme, by providing the second and third reinforcing ribs, the pressure on the reinforcement can be dispersed and the stress can be evenly transferred to other parts of the pipe, thereby reducing local stress concentration, maintaining the geometric shape of the reinforcement stable, and suppressing the expansion of the pipe end.

[0019] Optionally, a fourth reinforcing rib is provided between the axial side of the first pipe and the outer surface of the second reinforcement member;

[0020] A fifth reinforcement rib is provided between the axial side surface of the second pipe and the outer surface of the third reinforcement member.

[0021] In the above scheme, the fourth reinforcement rib and the fifth reinforcement rib tightly connect the reinforcement rib with the outer surface of the reinforcement, so that the reinforcement can more effectively transfer and disperse the stress when bearing load, greatly improving the overall stiffness, making the reinforcement less likely to deform when subjected to external force, thereby ensuring the reinforcement effect of the reinforcement on the pipe.

[0022] Optionally, along the axial direction of the first pipe, the thickness of the second reinforcing rib is H3, and along the circumferential direction of the first pipe, the thickness of the fourth reinforcing rib is H4, satisfying H3≤H4≤2H3;

[0023] Along the axial direction of the second pipe, the thickness of the third reinforcing rib is H5, and along the circumferential direction of the second pipe, the thickness of the fifth reinforcing rib is H6, satisfying H5≤H6≤2H5.

[0024] In the above scheme, the fifth and fourth reinforcement ribs avoid stress concentration caused by local excessive thickness on the one hand, and at the same time achieve smooth stress transition through thickness gradient, thereby improving the fatigue life of the structure. On the other hand, the ability of the reinforcement to inhibit expansion is further enhanced.

[0025] Optionally, the joint structure further includes a screw and two nuts, the screw passes through the second reinforcing rib, the first reinforcing rib and the third reinforcing rib in sequence, and the two nuts are respectively engaged with the threads at both ends of the screw in the length direction.

[0026] In the above solution, the screw, the second reinforcing rib, the first reinforcing rib and the third reinforcing rib can form a linkage force transmission structure for transmitting the axial force of the pipeline and achieving axial reinforcement of the pipeline.

[0027] Optionally, a first friction portion is provided between the second reinforcement member and the first end to increase friction between the second reinforcement member and the first end;

[0028] A second friction portion is provided between the third reinforcement member and the second end to increase friction between the third reinforcement member and the second end.

[0029] In the above scheme, the existence of the friction part enables the axial force to be transmitted more evenly through the contact interface. It can be understood that by increasing the friction between the second reinforcement and the first end, and the third reinforcement and the second end, the relative sliding or displacement of each component that may occur during the axial force transmission process can be effectively suppressed, thereby achieving axial reinforcement of the joint structure.

[0030] Optionally, the first friction portion is configured as a plurality of second protrusions formed on the inner side surface of the second reinforcement member. Along the axial direction of the first pipe, the size of the first friction portion is W1, and the length of the second reinforcement member is L1, satisfying W1≥0.1L1;

[0031] The second friction portion is constructed as a plurality of second protrusions formed on the inner side surface of the third reinforcement. Along the axial direction of the second pipe, the size of the second friction portion is W2, and the length of the third reinforcement is L2, satisfying W2≥0.1L2.

[0032] In the above scheme, the friction portion formed by multiple first protrusions or second protrusions significantly improves the friction between the second reinforcement and the first pipe, and the third reinforcement and the second pipe by increasing the contact area and surface roughness, thereby suppressing axial relative displacement and ensuring the stability of the joint when subjected to pressure or vibration. At the same time, the friction portion covers at least 10% of the length of the reinforcement in the axial direction, which can evenly distribute the axial force over a larger area, further improving the ability of the reinforcement to fix and transfer loads.

[0033] Optionally, the first reinforcement, the second reinforcement and the third reinforcement have the same structure and each includes a first sub-reinforcement and a second sub-reinforcement, which are connected to each other to form a ring structure that is sleeved on the first end, the second end or the electric fusion pipe.

[0034] In the above solution, the first reinforcement, the second reinforcement and the third reinforcement can all be connected and sleeved on the corresponding pipe fittings through the first sub-reinforcement and the second sub-reinforcement. Compared with the pipe fittings that need to add a reinforcement layer with complex processes to improve the strength of the pipe fittings and the pipe fittings that require large-scale on-site installation, the installation convenience is greatly improved, the installation process is simpler, and the user experience is improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] In order to more clearly illustrate the specific implementation methods of the present application or the technical solutions in the prior art, the following is a brief introduction to the drawings required for use in the specific implementation methods or the description of the prior art. Obviously, the drawings described below are some implementation methods of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without any creative work.

[0036] Figure 1 This is a schematic diagram of the overall structure of some embodiments of the present application;

[0037] Figure 2 This is a schematic diagram of the overall exploded structure of some embodiments of the present application;

[0038] Figure 3 This is a schematic structural diagram of a first reinforcement member in some embodiments of the present application;

[0039] Figure 4 This is a schematic structural diagram of a second reinforcement member in some embodiments of the present application;

[0040] Figure 5 This is a schematic structural diagram of a third reinforcement member in some embodiments of the present application;

[0041] Figure 6 Schematic diagram of the overall structure of some other embodiments of the present application;

[0042] Figure 7 Schematic diagram of the overall structure of some other embodiments of the present application;

[0043] Figure 8 A schematic diagram of a bursting pressure-time curve of some embodiments of the present application;

[0044] Figure 9 This is a schematic diagram of the overall top view of some embodiments of the present application;

[0045] Figure 10Schematic diagram of the cross-sectional structure of some embodiments of the present application.

[0046] [Description of Reference Numerals]

[0047] 100: first pipe; 110: first flow channel; 120: first end; 130: first connecting portion;

[0048] 200: second pipe; 210: second flow channel; 220: second end; 230: second connecting portion;

[0049] 300: electric fusion pipe fittings;

[0050] 400: reinforcement member; 400a: first sub-reinforcement member; 400b: second sub-reinforcement member;

[0051] 410: first reinforcement member; 411: first reinforcement rib;

[0052] 420: second reinforcement member; 421: second reinforcement rib; 422: fourth reinforcement rib; 423: first friction portion; 423a: first protrusion;

[0053] 430: third reinforcement member; 431: third reinforcement rib; 432: fifth reinforcement rib; 433: second friction portion; 433a: second protrusion;

[0054] 500: screw; 510: nut. DETAILED DESCRIPTION

[0055] To make the purpose, technical solutions, and advantages of the embodiments of the present application more clear, the technical solutions in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without making creative efforts shall fall within the scope of protection of this application.

[0056] Unless otherwise defined, all technical and scientific terms used in this application have the same meanings as commonly understood by those skilled in the art to which this application belongs. The terms used in the specification of this application are only for the purpose of describing specific embodiments and are not intended to limit this application. The terms "including" and "having" and any variations thereof in the specification and claims of this application and the above-mentioned drawings are intended to cover non-exclusive inclusions. The terms "first" and "second" in the specification and claims of this application or the above-mentioned drawings are used to distinguish different objects, rather than to describe a specific order or a primary-secondary relationship.

[0057] References to "embodiments" in this application mean that a particular feature, structure, or characteristic described in connection with the embodiment may be included in at least one embodiment of the application. The appearance of this phrase in various places in the specification does not necessarily refer to the same embodiment, nor does it constitute an independent or alternative embodiment that is mutually exclusive of other embodiments. It is understood, both explicitly and implicitly, by those skilled in the art that the embodiments described in this application may be combined with other embodiments.

[0058] In the description of this application, it should be noted that, unless otherwise expressly specified or limited, the terms "mounted," "connected," "connected," and "attached" should be understood in a broad sense. For example, they may refer to fixed connections, detachable connections, or integral connections; they may refer to direct connections, indirect connections through an intermediate medium, or internal connections between two components. Those skilled in the art will understand the specific meanings of the above terms in this application based on specific circumstances.

[0059] The term "and / or" in this application simply describes an association between related objects, indicating that three possible relationships exist. For example, A and / or B can represent: A exists alone, A and B exist simultaneously, and B exists alone. In addition, the character " / " in this application generally indicates that the related objects are in an "or" relationship.

[0060] The term "multiple" in this application refers to more than two (including two). Similarly, "multiple groups" refers to more than two groups (including two groups), and "multiple pieces" refers to more than two pieces (including two pieces).

[0061] Polyethylene and its composite pipes have the characteristics of good flexibility, corrosion resistance, and no pollution to the transported medium. They are widely used in nuclear power plant cooling water transportation, oil and gas transportation and other harsh working conditions with high pressure levels and high safety requirements.

[0062] Electric fusion joints are widely used for connecting non-metallic composite pipes due to their corrosion resistance, long service life, low leakage resistance, simple operation, and high reliability. Pipes used in harsh operating conditions, with high operating pressures, require enhanced safety, placing higher demands on the strength of the piping system. Research has shown that the development of reinforced thermoplastic pipes with continuous glass fiber or steel wire reinforcement has significantly improved the mechanical strength of polyethylene and its composite pipes. Therefore, the safety of plastic piping systems depends primarily on the strength of electric fusion joints. However, the structural reinforcement options for electric fusion joints in non-metallic piping systems are relatively limited.

[0063] In the existing technology, the strength of electric fusion joints has become a key limiting factor in improving the performance of polyethylene and its composite pipeline systems. Therefore, how to improve the strength of the joints has become a technical problem that urgently needs to be solved today.

[0064] In view of this, in order to improve the strength of the joint and improve the connection reliability, the embodiment of the present application discloses a shaft-ring combined high-strength composite pipe joint structure, in which at least one of the first pipe 100, the second pipe 200 and the electric fusion pipe fitting 300 is provided with a reinforcement part, thereby achieving stress redistribution of the first pipe 100, the second pipe 200 and the electric fusion pipe fitting 300, improving the stress load capacity, greatly improving the pressure-bearing effect of the joint structure, improving the connection reliability, and simple construction and convenient installation.

[0065] Reference below Figures 1-10 The joint structure proposed in the embodiments of the present application is described.

[0066] Please refer to Figure 1 、 Figure 2 、 Figure 3 、 Figure 4 、 Figure 5 and Figure 10 According to the first embodiment of the present application, the joint structure includes a first pipe 100, a second pipe 200 and an electric fusion pipe fitting 300.

[0067] The first pipe 100 has a first flow channel 110. Along the extension direction of the first flow channel 110, the first pipe 100 has a first end 120, and the first end 120 is provided with a first connecting portion 130; the second pipe 200 has a second flow channel 210. Along the extension direction of the second flow channel 210, the second pipe 200 has a second end 220, and the second end 220 is provided with a second connecting portion 230.

[0068] As an example, the first pipe 100 and the second pipe 200 can be at least one of a non-metallic composite pipe or a metal pipe, and the present application does not impose any restrictions on this. The non-metallic composite pipe includes one or more of polyethylene and its composite pipes, including steel-plastic composite pipes, aluminum-plastic composite pipes, glass fiber reinforced polyethylene pipes, multi-layer co-extruded composite pipes, carbon fiber reinforced polyethylene pipes, etc., and the present application does not impose any restrictions on this.

[0069] The electric fusion pipe fitting 300 is sleeved on the first connecting portion 130 and the second connecting portion 230 to connect the first flow channel 110 and the second flow channel 210. That is, a portion of the first pipe 100 and the second pipe 200 near their respective ends are connected to the electric fusion pipe fitting 300. In this arrangement, the first pipe 100 and the second pipe 200 are connected to form a whole by the electric fusion pipe fitting 300.

[0070] As an example, the electric fusion pipe fitting 300 can be at least one of a non-metallic composite pipe or a metal pipe, and the present application does not impose any restrictions on this. The non-metallic composite pipe includes one or more of polyethylene and its composite pipes, including steel-plastic composite pipes, aluminum-plastic composite pipes, glass fiber reinforced polyethylene pipes, multi-layer co-extruded composite pipes, carbon fiber reinforced polyethylene pipes, etc., and the present application does not impose any restrictions on this.

[0071] However, in addition to insufficient strength leading to wire breakage and insufficient rigidity leading to instability, pipe joint ends are prone to bulging failure, especially when conveying high-temperature media. Long-term hydrostatic tests have also revealed that pipe joint ends are prone to bulging and deformation under stress, ultimately leading to media leakage and failure at the pipe ends, severely shortening the service life of the pipe fittings and causing significant economic losses.

[0072] Therefore, in order to solve the above problems, at least one of the first end 120, the second end 220 and the electric fusion pipe fitting 300 in the embodiment of the present application is provided with a reinforcement member 400, and the reinforcement member 400 is suitable for limiting the radial displacement of the first end 120, the second end 220 or the electric fusion pipe fitting 300. That is, the load is shared by the reinforcement member 400, and the electric fusion joint and the pipe fitting are axially and circumferentially reinforced, so that the stress at the joint is at a lower level. With this arrangement, the reinforcement member effectively suppresses the deformation of the pipe fitting under pressure / temperature changes by constraining the radial displacement, thereby preventing the electric fusion joint from generating gaps due to expansion and contraction.

[0073] It can be understood that for the pipe fittings inside the electric fusion joint, the stress state is equivalent to that of a thick-walled cylinder subjected to internal pressure and axial force. The main stresses on the electric fusion joint are axial stress and hoop stress. When the pipeline system is subjected to axial force and internal pressure, the reinforcement has the same displacement trend as the connection position of the electric fusion joint and the pipe fittings, but the stiffness of the reinforcement is much greater than that of the electric fusion joint and the pipe fittings. Therefore, most of the axial stress and hoop stress of the electric fusion joint and the pipe fittings will be borne by the reinforcement.

[0074] In the above scheme, the reinforcement 400 improves the deformation resistance of the weak parts of the pipe (such as the connection end) through physical constraint. Especially in a high-pressure fluid environment, it can effectively resist the radial expansion trend of the pipeline caused by the internal pressure, and avoid pipe rupture or connection failure caused by local stress concentration. The reinforcement 400 can evenly disperse the load and reduce the chance of stress concentration, so that the pressure-bearing effect of the joint structure is greatly improved, and the connection reliability is improved.

[0075] In other embodiments, please refer to Figure 1 、 Figure 2 、 Figure 3 、 Figure 4 and Figure 5There are multiple reinforcement members 400. It can be understood that multiple reinforcement members 400 can provide support at different positions, disperse stress, reduce local stress concentration, and thus enhance the bearing capacity of the joint structure.

[0076] The plurality of reinforcement pieces include a first reinforcement piece 410 , a second reinforcement piece 420 and a third reinforcement piece 430 . The electrofusion pipe 300 is sleeved with the first reinforcement piece 410 , the first end 120 is sleeved with the second reinforcement piece 420 , and the second end 220 is sleeved with the third reinforcement piece 430 .

[0077] That is to say, the first reinforcement member 410 is sleeved on the outside of the electric fusion pipe fitting 300, and the first reinforcement member 410 can play a role in limiting the axial expansion of the electric fusion pipe fitting 300, the second reinforcement member 420 is sleeved on the outside of the first end 120, and the second reinforcement member 420 can play a role in limiting the expansion of the end of the first pipe 100, and the third reinforcement member 430 is sleeved on the outside of the second end 220, and the third reinforcement member 430 can play a role in limiting the expansion of the end of the second pipe 200.

[0078] With this arrangement, the electric fusion pipe fitting 300, the first pipe 100 and the second pipe 200 are reinforced by the first reinforcement member 410, the second reinforcement member 420 and the third reinforcement member 430 respectively, thereby achieving stress redistribution of the joint structure and improving the connection reliability of the joint structure.

[0079] As an example, the reinforcement member 400 may be provided only on the electrofusion pipe fitting 300, that is, only the first reinforcement member 410 may be provided on the outside of the electrofusion pipe fitting 300, thereby reinforcing the electrofusion pipe fitting 300 alone. The reinforcement member 400 may also be provided only on the first pipe 100, that is, only the second reinforcement member 420 may be provided on the outside of the first pipe 100, thereby reinforcing the first pipe 100 alone.

[0080] Alternatively, the reinforcement member 400 may be simultaneously provided on the first pipe 100 and the second pipe 200 , that is, only the second reinforcement member 420 and the third reinforcement member 430 may be respectively provided on the outside of the first pipe 100 and the second pipe 200 , thereby suppressing bulging and expansion of the ends of the first pipe 100 and the second pipe 200 .

[0081] Alternatively, the reinforcement member 400 may be only provided on the electrofusion pipe fitting 300 and the first pipe 100 , that is, only the first reinforcement member 410 and the second reinforcement member 420 may be respectively provided on the outside of the electrofusion pipe fitting 300 and the first pipe 100 , thereby achieving reinforcement of the electrofusion pipe fitting 300 and the first pipe 100 .

[0082] In other embodiments, along the axial direction of the electrofusion pipe 300 , the length of the first reinforcement member 410 is D1 , and the length of the electrofusion pipe 300 is D2 , satisfying D1 ≥ 0.1D2 .

[0083] In the above scheme, sufficient length can ensure that the reinforcement covers the main stress-bearing area of the pipe fitting, better disperses stress, and reduces the deformation of the electric fusion pipe fitting 300. It can be understood that since the axial length of the first reinforcement 410 along the electric fusion pipe fitting 300 in this scheme and the length of the electric fusion pipe fitting 300 meet the above range, on the one hand, the bending stiffness of the electric fusion pipe fitting 300 can be improved and the connection reliability can be improved. On the other hand, the first reinforcement 410 can be avoided from being too large, thereby reducing costs.

[0084] In other embodiments, please refer to Figure 2 and Figure 3 The outer surface of the first reinforcement member 410 is provided with a first reinforcement rib 411 extending circumferentially along the electrofusion pipe 300. It can be understood that the circumferential first reinforcement rib 411 can enhance the annular strength of the structure to resist internal pressure or external load.

[0085] Along the radial direction of the electric fusion pipe fitting 300, the first reinforcing rib 411 protrudes from the outer surface of the first reinforcement member 410. That is, the first reinforcing rib 411 is an annular structure extending circumferentially along the first reinforcement member 410, surrounding the outer surface of the first reinforcement member 410. The annular first reinforcing rib 411 forms a rigid support ring by increasing the local wall thickness, significantly improving the overall strength.

[0086] In the above scheme, the first reinforcing rib 411 is used to increase the stiffness and strength of the first reinforcement 410 and reduce the deformation probability of the first reinforcement 410, that is, when the first reinforcement 410 is subjected to internal or external pressure, the first reinforcing rib 411 can better disperse the stress, thereby better resisting deformation. In addition, when the first reinforcement 410 is subjected to internal pressure, the circumferential stress is one of the main stresses. The circumferentially extending first reinforcing rib 411 significantly improves the ability of the first reinforcement 410 to resist circumferential deformation by increasing the moment of inertia of the section, thereby preventing expansion or rupture caused by pressure, and thereby realizing the circumferential reinforcement of the electric fusion pipe 300 through the first reinforcement 410.

[0087] In addition, under periodic pressure or long-term static load, the first reinforcing rib 411 can reduce the local stress amplitude, delay material fatigue and creep failure, and extend the life of the first reinforcement member 410.

[0088] In other embodiments, please refer to 9 and Figure 10 Along the radial direction of the electrofusion pipe 300 , the thickness of the first reinforcement member 410 is H1 , and along the axial direction of the electrofusion pipe 300 , the thickness of the first reinforcement rib 411 is H2 ; and H1≤H2≤2H1 is satisfied.

[0089] That is to say, the thickness of the first reinforcement rib 411 is 1-2 times the thickness of the first reinforcement 410. With this arrangement, thicker reinforcement ribs may more effectively disperse stress, reduce the load borne by the first reinforcement 410, and reduce cracking or fatigue caused by stress concentration, thereby improving the long-term tolerance of the first reinforcement 410.

[0090] It can be understood that since the thickness of the first reinforcing rib 411 and the thickness of the first reinforcement 410 meet the above range, on the one hand, the bending stiffness and deformation resistance of the first reinforcement 410 can be improved, and on the other hand, the problem of uneven cooling shrinkage, increased internal stress, etc. that may occur during injection molding or extrusion molding due to the large difference between the thickness of the first reinforcing rib 411 and the thickness of the first reinforcement 410 is reduced.

[0091] In the above scheme, the increase in the thickness of the reinforcement rib will significantly increase its cross-sectional moment of inertia (proportional to the cube of the thickness), so that the bending stiffness and deformation resistance of the first reinforcement 410 are greatly improved when it is subjected to circumferential pressure or external extrusion. At the same time, the thicker reinforcement rib can distribute the external load (such as internal pressure, impact) more evenly to the first reinforcement 410, avoiding stress concentration in the weak area of the first reinforcement 410.

[0092] In other embodiments, please refer to Figure 4 and Figure 5 The outer surface of the second reinforcement member 420 is provided with a second reinforcement rib 421 extending along the circumference of the first pipe 100. Along the radial direction of the first pipe 100, the second reinforcement rib 421 protrudes from the outer surface of the second reinforcement member 420. It can be understood that the circumferential second reinforcement rib 421 can enhance the annular strength of the structure and resist internal pressure or external loads.

[0093] Along the radial direction of the first pipe 100, the second reinforcing rib 421 protrudes from the outer surface of the second reinforcement member 420. That is, the second reinforcing rib 421 is an annular structure extending circumferentially along the second reinforcement member 420, surrounding the outer surface of the second reinforcement member 420. The annular second reinforcing rib 421 forms a rigid support ring by increasing the local wall thickness, thereby significantly improving the overall strength.

[0094] It can be understood that the second reinforcement rib 421 is used to increase the stiffness and strength of the second reinforcement 420 and reduce the deformation probability of the second reinforcement 420, that is, when the second reinforcement 420 is subjected to internal or external pressure, the second reinforcement rib 421 can better disperse the stress, thereby better resisting deformation. In addition, when the second reinforcement 420 is subjected to internal pressure, the circumferential stress is one of the main stresses. The circumferentially extending second reinforcement rib 421 significantly improves the ability of the second reinforcement 420 to resist circumferential deformation by increasing the moment of inertia of the section, prevents expansion or rupture caused by pressure, and then realizes the structural reinforcement of the first pipe 100 through the second reinforcement 420, which plays a role in suppressing the bulging of the end of the first pipe 100.

[0095] In addition, under periodic pressure or long-term static load, the second reinforcing rib 421 can reduce the local stress amplitude, delay material fatigue and creep failure, and extend the life of the second reinforcement member 420.

[0096] The outer surface of the third reinforcement member 430 is provided with a third reinforcement rib 431 extending along the circumference of the second pipe 200 . In the radial direction of the second pipe 200 , the third reinforcement rib 431 protrudes from the outer surface of the third reinforcement member.

[0097] It can be understood that the third reinforcement rib 431 is used to increase the stiffness and strength of the third reinforcement 430 and reduce the deformation probability of the third reinforcement 430. That is, when the third reinforcement 430 is subjected to internal or external pressure, the third reinforcement rib 431 can better disperse the stress and thus better resist deformation. In addition, when the third reinforcement 430 is subjected to internal pressure, the circumferential stress is one of the main stresses. The circumferentially extending third reinforcement rib 431 significantly improves the ability of the third reinforcement 430 to resist circumferential deformation by increasing the moment of inertia of the section, thereby preventing expansion or rupture caused by pressure, and further realizing the structural reinforcement of the second pipe 200 through the second reinforcement 420, thereby suppressing the bulging of the end of the second pipe 200.

[0098] In addition, under periodic pressure or long-term static load, the third reinforcing rib 431 can reduce the local stress amplitude, delay material fatigue and creep failure, and extend the service life of the third reinforcement member 430.

[0099] In the above solution, by providing the second reinforcing rib 421 and the third reinforcing rib 431, the pressure on the reinforcement can be dispersed and the stress can be evenly transferred to other parts of the pipe, thereby reducing local stress concentration, maintaining the geometric shape of the reinforcement stable, and suppressing the expansion of the end of the pipe.

[0100] At the same time, when the pipe is subjected to a transverse bending force, the second reinforcing ribs 421 and the third reinforcing ribs 431 can increase the bending modulus of the end of the pipe, thereby ensuring the flatness and tightness of the sealing surface.

[0101] In other embodiments, please refer to Figure 4 and Figure 5 A fourth reinforcing rib 422 is provided between the axial side of the first pipe 100 and the outer surface of the second reinforcing member 420 ;

[0102] A fifth reinforcement rib 432 is provided between the axial side surface of the second pipe 200 and the outer surface of the third reinforcement member 430 .

[0103] In the above scheme, the fourth reinforcement rib 422 and the fifth reinforcement rib 432 tightly connect the reinforcement ribs to the outer surface of the reinforcement, so that the reinforcement can more effectively transfer and disperse the stress when bearing load, greatly improving the overall stiffness, making the reinforcement less likely to deform when subjected to external force, thereby ensuring the reinforcement effect of the reinforcement on the pipe.

[0104] Taking pipe fittings that bear axial pressure as an example, after adding these reinforcing ribs, the reinforcement can better resist pressure, reduce axial compression deformation, and ensure that the pipe fittings can maintain a stable shape and size under various working conditions.

[0105] That is to say, by providing additional support and constraints, the reinforcing ribs can maintain their original shape and position when subjected to external forces, thereby ensuring the reinforcing effect of the reinforcement on the pipe fitting.

[0106] It is understood that when the reinforcing rib is subjected to a torsional force, the fourth reinforcing rib 422 and the fifth reinforcing rib 432 can effectively prevent the reinforcing rib from twisting and moving. They increase the connection strength between the reinforcing rib and the reinforcement, making the entire structure more stable.

[0107] In other embodiments, please refer to 9 and Figure 10 , along the axial direction of the first pipe 100 , the thickness of the second reinforcing rib 421 is H3, and along the circumferential direction of the first pipe 100 , the thickness of the fourth reinforcing rib 422 is H4, satisfying, H3≤H4≤2H3;

[0108] That is to say, the thickness of the fourth reinforcement rib 422 is 1-2 times the thickness of the second reinforcement rib 421. With this arrangement, thicker reinforcement ribs may more effectively disperse stress, reduce the load borne by the second reinforcement 420, and reduce the occurrence of cracking or fatigue caused by stress concentration, thereby improving the long-term tolerance of the second reinforcement 420.

[0109] It can be understood that since the thickness of the fourth reinforcing rib 422 is within the above-mentioned range of the thickness of the second reinforcing rib 421, on the one hand, the bending stiffness and deformation resistance of the second reinforcement 420 can be improved, and on the other hand, the gap between the thickness of the fourth reinforcing rib 422 and the thickness of the second reinforcing rib 421 is reduced, which may cause uneven cooling shrinkage, increased internal stress and other problems during injection molding or extrusion molding.

[0110] In the above solution, the fourth reinforcing rib 422 strengthens the circumferential constraint of the second reinforcing rib 421 on the first pipe 100, which is particularly suitable for scenarios with high pressure or dynamic loads, so that the second reinforcing rib 421 provides stronger support in the circumferential direction to resist the radial expansion of the first pipe 100 caused by internal pressure or external loads.

[0111] Along the axial direction of the second pipe 200 , the thickness of the third reinforcing rib 431 is H5 , and along the circumferential direction of the second pipe 200 , the thickness of the fifth reinforcing rib 432 is H6 , satisfying H5≤H6≤2H5.

[0112] That is to say, the thickness of the fifth reinforcement rib 432 is 1-2 times the thickness of the third reinforcement rib 431. With this arrangement, thicker reinforcement ribs may more effectively disperse stress, reduce the load borne by the third reinforcement 430, and reduce the occurrence of cracking or fatigue caused by stress concentration, thereby improving the long-term tolerance of the second reinforcement 420.

[0113] It can be understood that since the thickness of the fifth reinforcing rib 432 is within the above-mentioned range of the thickness of the third reinforcing rib 431, on the one hand, the bending stiffness and deformation resistance of the third reinforcement 430 can be improved, and on the other hand, the gap between the thickness of the fifth reinforcing rib 432 and the thickness of the third reinforcing rib 431 can be reduced, which may cause uneven cooling shrinkage, increased internal stress and other problems during injection molding or extrusion molding.

[0114] In the above solution, the fifth reinforcing rib 432 strengthens the circumferential constraint of the third reinforcing rib 431 on the second pipe 200, which is particularly suitable for scenarios with high pressure or dynamic loads, so that the third reinforcing rib 431 provides stronger support in the circumferential direction to resist the radial expansion of the second pipe 200 caused by internal pressure or external loads.

[0115] In the above solution, the fifth reinforcement rib 432 and the fourth reinforcement rib 422 avoid stress concentration caused by local excessive thickness on the one hand, and at the same time achieve smooth stress transition through thickness gradient, thereby improving the fatigue life of the structure, and on the other hand further enhance the ability of the reinforcement to inhibit expansion.

[0116] In other embodiments, please refer to Figure 2The joint structure also includes a screw 500 and two nuts 510. The screw 500 passes through the second reinforcing rib 421, the first reinforcing rib 411 and the third reinforcing rib 431 in sequence. The two nuts 510 are respectively threadedly engaged with the two ends of the screw 500 in the length direction.

[0117] It is understandable that the screw 500, the second reinforcing rib 421, the first reinforcing rib 411 and the third reinforcing rib 431 can form a linkage force transmission structure for transmitting the axial force of the pipeline to achieve axial reinforcement of the pipeline.

[0118] In the above scheme, the screw 500 passes through the second reinforcing rib 421, the first reinforcing rib 411 and the third reinforcing rib 431 in sequence. When any of the reinforcing ribs is subjected to axial force, the axial force can be transmitted to other reinforcing ribs and corresponding reinforcements through the screw 500, thereby achieving joint load-bearing.

[0119] In other embodiments, please refer to Figure 4 and Figure 5 A first friction portion 423 is provided between the second reinforcement member 420 and the first end 120 to increase the friction force between the second reinforcement member 420 and the first end 120;

[0120] A second friction portion 433 is provided between the third reinforcement member 430 and the second end 220 to increase friction between the third reinforcement member 430 and the second end 220 .

[0121] In the above scheme, the presence of the friction part enables the axial force to be transmitted more evenly through the contact interface. It can be understood that by increasing the friction between the second reinforcement 420 and the first end 120, and the third reinforcement 430 and the second end 220, the relative sliding or displacement of each component that may occur during the axial force transmission process can be effectively suppressed, thereby achieving axial reinforcement of the joint structure.

[0122] In addition, the friction part can disperse concentrated stress to a larger area by increasing the contact area or changing the surface characteristics (such as tooth patterns and rough surfaces), thereby reducing the risk of local overload and extending the fatigue life of the structure.

[0123] It can be understood that when the fluid pressure generates axial thrust, the friction part and the screw 500 work together to resist axial separation through pre-tightening force and suppress the relative slippage between the reinforcement rib and the pipe end through interface friction, thereby ensuring the safety of the overall structure under alternating loads.

[0124] Please refer to 9 and Figure 10 The first friction portion 423 is constructed as a plurality of second protrusions 433a formed on the inner side surface of the second reinforcement 420. Along the axial direction of the first pipe 100, the size of the first friction portion 423 is W1, and the length of the second reinforcement 420 is L1, satisfying W1≥0.1L1.

[0125] The second friction portion 433 is constructed as a plurality of second protrusions 433a formed on the inner side surface of the third reinforcement 430. Along the axial direction of the second pipe 200, the size of the second friction portion 433 is W2, and the length of the third reinforcement 430 is L2, satisfying W2≥0.1L2.

[0126] In the above scheme, the friction portion formed by multiple first protrusions 423a or second protrusions 433a significantly improves the friction between the second reinforcement 420 and the first pipe 100, and the third reinforcement 430 and the second pipe 200 by increasing the contact area and surface roughness, thereby suppressing axial relative displacement and ensuring the stability of the joint when subjected to pressure or vibration.

[0127] At the same time, the friction part is covered with reinforcements for at least 10% of its length in the axial direction, which can evenly distribute the axial force over a larger area, avoid local wear or structural failure caused by stress concentration, and extend the service life of the joint.

[0128] As an example, the first protrusion 423a and the second protrusion 433a can be constructed as spike-shaped protrusions or sharp tooth-shaped protrusions, which is not limited in this application. The depth between adjacent protrusions is 2mm-8mm, further improving the ability of the reinforcement to fix and transfer loads.

[0129] The sharp angle of the spike-like protrusion is 5°-60°, and the tooth pitch of the sharp tooth-shaped protrusion is 1mm-5mm.

[0130] When installing the reinforcement, the first protrusion 423a or the second protrusion 433a can be embedded in the outer surface of the pipe, preventing slippage between the reinforcement and the pipe and ensuring its ability to transmit load. The reinforcement is made of 304 stainless steel, which has greater rigidity than non-metallic composite pipes, thereby improving the pressure-bearing strength of the joint structure.

[0131] In other implementations, see Figure 3 、 Figure 4 and Figure 5 The first reinforcement 410, the second reinforcement 420 and the third reinforcement 430 have the same structure and all include a first sub-reinforcement 400a and a second sub-reinforcement 400b. The first sub-reinforcement 400a and the second sub-reinforcement 400b are connected to each other to form a ring structure that is sleeved on the first end 120, the second end 220 or the electric fusion pipe 300.

[0132] In the above solution, the first reinforcement 410, the second reinforcement 420 and the third reinforcement 430 can be connected and sleeved on the corresponding pipe fittings through the first sub-reinforcement 400a and the second sub-reinforcement 400b. Compared with the pipe fittings that need to add a reinforcement layer with complex processes to improve the strength of the pipe fittings and the pipe fittings that require large-scale on-site installation, the installation convenience is greatly improved, the installation process is simpler, and the user experience is improved.

[0133] As an example, the first reinforcement 410, the second reinforcement 420 and the third reinforcement 430 are all provided with connection holes for accommodating the screw 500, and the clearance between the screw 500 and the connection hole is 1mm-2mm, which is convenient for installation.

[0134] As an example, the materials used to make the first reinforcement 410 , the second reinforcement 420 , the third reinforcement 430 and the screw 500 include but are not limited to metal materials such as carbon steel, stainless steel, and alloy steel, and this application does not impose any restrictions on this.

[0135] The following briefly describes the axial reinforcement process of this solution. The axial load is first transferred to the first reinforcement member 410 through the contact interface between the electrofusion pipe fitting 300 and the first reinforcement member 410. Then, the load is transferred from the first reinforcement member 410 through the screw 500 to the second reinforcement member 420 and / or the third reinforcement member 430. Finally, the load is transferred to the first pipe 100 or the second pipe 200 through the contact interface between the second reinforcement member 420 and the third reinforcement member 430, respectively. The load transfer capability of the second reinforcement member 420 and the third reinforcement member 430 at their respective pipe interfaces directly impacts the reinforcement effect. Therefore, sharp tooth-shaped projections are designed on the inner surfaces of the second and third reinforcement members 420 and 430. During installation, the sharp tooth-shaped projections engage the outer surface of the corresponding pipe, preventing slippage between the second and third reinforcement members 420 and 430 and the corresponding pipe, thereby ensuring their load transfer capability.

[0136] In the specific embodiment 1, please refer to Figure 6 The inner diameter of the electric fusion pipe fitting 300 is 110 mm, the wall thickness is 10 mm, and the axial length is 140 mm. The electric fusion pipe fitting 300 is constructed as a polyethylene part with a pressure rating of 3 MPa. The first pipe 100 and the second pipe 200 are composite pipes with a steel wire reinforcement layer, with an outer diameter of 110 mm, a wall thickness of 12 mm, and a pressure rating of 8 MPa.

[0137] Connect the two terminals of the electrofusion pipe fitting 300 to the electric fusion welder using welding wires and apply power. After welding, symmetrically place the first and second sub-reinforcements 400a and 400b of the first reinforcement 410 around the outer surface of the electrofusion pipe fitting 300, ensuring a tight fit and securing the connection with bolts.

[0138] The first sub-reinforcement 400a and the second sub-reinforcement 400b of the second reinforcement 420 and the third reinforcement 430 are symmetrically placed on the outside of the first pipe 100 and the second pipe 200. The first protrusion 423a and the second protrusion 433a are both constructed as annular tensile thorns. During installation, the end faces of the first sub-reinforcement 400a and the second sub-reinforcement 400b are tightly attached to the end face of the first pipe 100 or the second pipe 200, and ensure that the annular tensile thorns are embedded in the outer surface of the pipe. The first sub-reinforcement 400a and the second sub-reinforcement 400b are fastened together by bolts.

[0139] Pass the four screws 500 through the connection holes of the first reinforcement 410, the second reinforcement 420 and the third reinforcement 430, and fasten them to the reinforcement surface of the second reinforcement 420 and the third reinforcement 430 through the nuts 510. Figure 8 The bursting pressure is 24MPa, and the average bursting pressure of the original PE electric fusion joint is 8.7MPa. In comparison, the mechanical strength is increased by 176%.

[0140] In another specific embodiment, please refer to Figure 1 The parameters of the electric fusion pipe fitting 300, the first pipe 100 and the second pipe 200 used are the same as those in the specific embodiment 1. The two terminals of the electric fusion pipe fitting 300 are connected to the electric fusion welding machine with welding wires, and electricity is turned on for welding.

[0141] After welding is completed, the distance between the second reinforcement 420 and the third reinforcement 430 close to the end of the electric fusion pipe 300 and the electric fusion pipe 300 can be 65mm. The installation steps of the remaining components are the same as those in the specific embodiment 1. The connected pipes and joints are subjected to a blast test. Please refer to Figure 8 The bursting pressure can be 18.9MPa, and the average bursting pressure of the original PE electric fusion joint can be 8.7MPa. In comparison, the mechanical strength is increased by 122%.

[0142] In the third specific embodiment, please refer to Figure 7 The electric fusion pipe fitting 300 used was a polyethylene electric fusion joint with an inner diameter of 315 mm, a wall thickness of 31 mm, and an axial length of 236 mm. The first pipe 100 and the second pipe 200 were steel-wire reinforced composite pipes with an outer diameter of 315 mm and a wall thickness of 28.6 mm. The two terminals of the electric fusion pipe fitting 300 were connected to the electric fusion welder using welding wires and then welded. The remaining metal clamp installation steps were the same as in Specific Example 1.

[0143] In a second aspect, the embodiment of the present application further discloses a method for installing a joint structure, comprising the following steps: (1) inserting a first pipe 100 and a second pipe 200 to be welded into an electric fusion pipe fitting 300;

[0144] (2) Using wires to connect to the terminals of the electric fusion pipe 300, and then welding them;

[0145] (3) The first sub-reinforcement 400a and the second sub-reinforcement 400b of the first reinforcement 410 are symmetrically placed on the outside of the electrofusion pipe 300 and fastened together;

[0146] (4) The first sub-reinforcement 400a and the second sub-reinforcement 400b of the second reinforcement 420 and the third reinforcement 430 are symmetrically placed on the outside of the first pipe 100 and the second pipe 200. During installation, ensure that the annular tensile barbs are embedded in the outer surface of the pipes and tighten the connection;

[0147] (5) Fasten the screw 500 to the reinforcement ribs of the second reinforcement member 420 and the third reinforcement member 430 through the nut 510, calculate the torque value according to the designed preload force, and use a torque wrench to rotate the nut 510 to the specified torque value.

[0148] It should also be noted that the terms "comprises," "includes," or any other variations thereof are intended to encompass non-exclusive inclusion, such that a process, method, commodity, or apparatus that includes a series of elements includes not only those elements but also other elements not explicitly listed, or includes elements inherent to such process, method, commodity, or apparatus. In the absence of further limitations, an element defined by the phrase "comprises a ..." does not exclude the presence of other identical elements in the process, method, commodity, or apparatus that includes the element.

[0149] The various embodiments in this specification are described in a progressive manner. Similar parts between the various embodiments can be referred to in conjunction with each other. Each embodiment focuses on the differences between the other embodiments. In particular, the system embodiments are generally similar to the method embodiments, so the description is relatively simple. For relevant parts, refer to the description of the method embodiments.

[0150] The foregoing is merely an embodiment of the present application and is not intended to limit the present application. For those skilled in the art, the present application may have various changes and variations. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present application should all be included within the scope of the claims of the present application.

[0151] Although the embodiments of the present application have been described with reference to the accompanying drawings, those skilled in the art may make various modifications and variations without departing from the spirit and scope of the present application, and such modifications and variations shall fall within the scope defined by the appended claims.

Claims

1. A shaft-ring combined high-strength composite pipe joint structure, characterized in that: include: A first pipe has a first flow channel, and along an extension direction of the first flow channel, the first pipe has a first end, and the first end is provided with a first connecting portion; A second pipe has a second flow channel, and along an extension direction of the second flow channel, the second pipe has a second end, and the second end is provided with a second connecting portion; an electric fusion pipe fitting, sleeved on the first connecting portion and the second connecting portion to connect the first flow channel and the second flow channel; Wherein, at least one of the first end, the second end and the electrofusion pipe is sleeved with a reinforcement member, and the reinforcement member is suitable for limiting the radial displacement of the first end, the second end or the electrofusion pipe.

2. The joint structure according to claim 1, characterized in that: There are multiple reinforcement pieces, and the multiple reinforcement pieces include a first reinforcement piece, a second reinforcement piece and a third reinforcement piece. The electric fusion pipe is provided with the first reinforcement piece, the first end is provided with the second reinforcement piece, and the second end is provided with the third reinforcement piece.

3. The joint structure according to claim 2, characterized in that: Along the axial direction of the electrofusion pipe, the length of the first reinforcement member is D1, and the length of the electrofusion pipe is D2, satisfying D1≥0.1D2.

4. The joint structure according to claim 2, characterized in that: The outer surface of the first reinforcement member is provided with a first reinforcement rib extending along the circumferential direction of the electrofusion pipe. In the radial direction of the electrofusion pipe, the first reinforcement rib protrudes from the outer surface of the first reinforcement member.

5. The joint structure according to claim 4, characterized in that: Along the radial direction of the electrofusion pipe, the thickness of the first reinforcement member is H1, and along the axial direction of the electrofusion pipe, the thickness of the first reinforcement rib is H2; and the condition H1≤H2≤2H1 is satisfied.

6. The joint structure according to claim 4, characterized in that: The outer surface of the second reinforcement member is provided with a second reinforcement rib extending along the circumference of the first pipe, and along the radial direction of the first pipe, the second reinforcement rib protrudes from the outer surface of the second reinforcement member; The outer surface of the third reinforcement member is provided with a third reinforcement rib extending along the circumferential direction of the second pipe. In the radial direction of the second pipe, the third reinforcement rib protrudes from the outer surface of the third reinforcement member.

7. The joint structure according to claim 6, characterized in that: The second reinforcement rib is provided with a fourth reinforcement rib between the axial side surface of the first pipe and the outer surface of the second reinforcement member; The third reinforcement rib is provided with a fifth reinforcement rib between an axial side surface of the second pipe and an outer surface of the third reinforcement member.

8. The joint structure according to claim 7, characterized in that: The thickness of the second reinforcing rib along the axial direction of the first pipe is H3, and the thickness of the fourth reinforcing rib along the circumferential direction of the first pipe is H4, satisfying H3≤H4≤2H3; Along the axial direction of the second pipe, the thickness of the third reinforcing rib is H5, and along the circumferential direction of the second pipe, the thickness of the fifth reinforcing rib is H6, satisfying H5≤H6≤2H5.

9. The joint structure according to claim 8, characterized in that: The joint structure further includes a screw and two nuts. The screw passes through the second reinforcing rib, the first reinforcing rib and the third reinforcing rib in sequence. The two nuts are respectively threadedly engaged with both ends of the screw in the length direction.

10. The joint structure according to claim 2, characterized in that: A first friction portion is provided between the second reinforcement member and the first end to increase friction between the second reinforcement member and the first end; A second friction portion is provided between the third reinforcement member and the second end to increase friction between the third reinforcement member and the second end.

11. The joint structure according to claim 10, characterized in that: The first friction portion is configured as a plurality of first protrusions formed on the inner side surface of the second reinforcement member. Along the axial direction of the first pipe, the size of the first friction portion is W1, and the length of the second reinforcement member is L1, satisfying W1 ≥ 0.1L1; The second friction portion is constructed as a plurality of second protrusions formed on the inner side surface of the third reinforcement. Along the axial direction of the second pipe, the size of the second friction portion is W2, and the length of the third reinforcement is L2, satisfying W2≥0.1L2.

12. The joint structure according to claim 2, characterized in that: The first reinforcement, the second reinforcement and the third reinforcement have the same structure and each includes a first sub-reinforcement and a second sub-reinforcement. The first sub-reinforcement and the second sub-reinforcement are connected to each other to form an annular structure that is sleeved on the first end, the second end or the electric fusion pipe.

Images