Thermoplastic reinforced composite pipe connection device

Abstract

The utility model discloses a connecting device for thermoplastic reinforced composite pipe, including two connecting pipes, two connecting pipes opposite end integral molding connecting boss, and the boss is around setting in the connecting pipe end outer edge, and the boss circumferential even setting several bolt holes, and the boss both sides all set flange, and the flange is located the boss outside, and two flange inboard opposite end all set gasket, and the flange, gasket circumferential even distribution several mounting holes, and the mounting hole and bolt hole setting position correspond, and every mounting hole, bolt hole inner sleeve bolt, and the bolt is correspondingly set nut. The utility model has solved the problem that the joint strength is poor in the existing composite pipe connecting technology.

Description

Technical Field

[0001] This utility model belongs to the technical field of composite pipe connection equipment, and relates to a connection device for thermoplastic reinforced composite pipes. Background Technology

[0002] Reinforced thermoplastic composite pipes (such as RTP pipes) are multi-layered pipes with thermoplastic plastic as the matrix and high-strength, meltable reinforcing materials such as oriented fibers and fabrics inside. They combine the corrosion resistance of plastics with the pressure-bearing capacity close to that of metals. Connecting pipes requires pipe fittings, which not only need to be compatible with the shape and size of the connection ends of each pipe but also need to ensure a tight connection. The quality of the composite pipe connection directly affects the fluid transport efficiency within the pipeline. Existing pipe fittings are diverse, but they generally suffer from insufficient tightness, even leakage, or low structural strength between the pipe and fitting after connection, resulting in a short service life. Traditional connection methods mainly include heat fusion and mechanical connection. The core advantage of heat fusion is that it can achieve seamless sealing, significantly improving the reliability and lightweighting of high-pressure and corrosive fluid transport systems. However, quality control is difficult during heat fusion, and common defects such as incomplete welds, missed welds, burn-through, charring, and weak welds are prone to occur, leading to insufficient joint strength.

[0003] To overcome the drawbacks of composite pipe heat fusion connection technology, it is usually necessary to rely on technicians to visually inspect the construction site of the connecting pipe interface. However, visual inspection is difficult to detect hidden dangers, which can lead to joint sealing failure, causing media leakage, and the pipe may burst under pressure fluctuations or external forces due to a sudden drop in connection strength, posing a hidden danger to construction safety. Utility Model Content

[0004] The purpose of this invention is to provide a connection device for thermoplastic reinforced composite pipes, which solves the problem of poor joint strength in existing composite pipe connection technologies.

[0005] The technical solution adopted by this utility model is a connecting device for thermoplastic reinforced composite pipes, including two connecting pipes. The opposite ends of the two connecting pipes are integrally formed with connecting bosses. The bosses are arranged around the outer edge of the ends of the connecting pipes. A number of bolt holes are evenly arranged around the circumference of the bosses. Flanges are provided on both sides of the bosses. The flanges are located on the outer side of the bosses. Gaskets are provided on the opposite ends of the inner sides of the two flanges. A number of mounting holes are evenly arranged around the circumference of the flanges and gaskets. The mounting holes are corresponding to the bolt holes. Bolts are fitted into each mounting hole and bolt hole. Nuts are correspondingly provided on the bolts.

[0006] The present invention is further characterized in that: The two connecting pipes are connected by a hot-melt process. One end of the connecting pipe is hot-melted to expand its diameter and folded outward. The inner lining of the connecting pipe is connected and fused together, and a boss is formed by hot-melt extrusion at the joint.

[0007] The inner ring of the flange is provided with an arc-shaped chamfer edge around its circumference, and the inner ring of the flange contacts the outer side of the boss, matching the shape of the outer side of the boss.

[0008] The inner ring of the flange has a rounded chamfer edge that mates with the heat-fused bend of the connecting pipe.

[0009] The inner sides of the two gaskets abut against the heat-fused bends of the connecting pipe.

[0010] The gasket is made of elastic material.

[0011] Four bolt holes are made on the bosses of the two connecting pipes. Two gaskets are installed opposite each other inside the two flanges. The inner side of the gaskets abuts against the bend of the connecting pipe. Four mounting holes are made on the flanges and gaskets. One end of the bolt passes through the mounting hole and the bolt hole and is connected to the nut.

[0012] The gasket uses a perfluororubber O-ring.

[0013] Both flanges have an anti-corrosion coating on their inner surfaces.

[0014] The beneficial effects of this utility model are as follows: This utility model is used for a thermoplastic reinforced composite pipe connection device. By using bolts to vertically penetrate and anchor the boss body, the axial tensile force is directly converted into the shear force at the root of the boss, which significantly improves the tensile efficiency and achieves an effective sealing effect. It solves the problem of poor joint strength in existing composite pipe connection technologies and can efficiently complete the entire process of connecting reinforced thermoplastic composite pipes in batches. It not only greatly improves production efficiency but also greatly improves the sealing effect, achieving good results in practical applications. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the assembly structure of the thermoplastic reinforced composite pipe connection device of this utility model; Figure 2 This is a schematic diagram of the manufacturing process of the thermoplastic reinforced composite pipe connection device of this utility model; Figure 3 This is a schematic diagram of the hot-melt connection structure of the thermoplastic reinforced composite pipe connection device of this utility model; Figure 4 This is a schematic diagram of the flange structure of the thermoplastic reinforced composite pipe connection device of this utility model.

[0016] In the diagram, 1. connecting pipe, 2. flange, 3. gasket, 4. bolt, 5. nut. Detailed Implementation

[0017] The following detailed description is provided in conjunction with specific implementation methods.

[0018] Example 1 This utility model is used for a connection device for thermoplastic reinforced composite pipes, the structure of which is as follows: Figure 1 , Figure 2 , Figure 3 As shown, it includes two connecting pipes 1. The opposite ends of the two connecting pipes 1 are integrally formed with connecting bosses. The bosses are arranged around the outer edge of the end of the connecting pipe 1. Several bolt holes are evenly arranged around the circumference of the bosses. Flanges 2 are provided on both sides of the bosses. The flanges 2 are located on the outer side of the bosses. Gaskets 3 are provided on the opposite ends of the inner sides of the two flanges 2. Several mounting holes are evenly arranged around the circumference of the flanges 2 and gaskets 3. The mounting holes are corresponding to the bolt holes. Bolts 4 are fitted into each mounting hole and bolt hole. Nuts 5 are correspondingly provided on the bolts 4.

[0019] This utility model is used for a thermoplastic reinforced composite pipe connection device. The boss can apply an outward force from the inside of the inner ring of the connecting pipe, thereby making the connection with the flange 2 and gasket 3 tighter and avoiding the generation of cracks or holes.

[0020] Example 2 This utility model relates to a connection device for thermoplastic reinforced composite pipes, comprising two connecting pipes 1, with integrally formed connecting bosses at opposite ends of the two connecting pipes 1. The bosses are arranged around the outer edge of the ends of the connecting pipes 1, and a plurality of bolt holes are evenly distributed around the circumference of the bosses. Flanges 2 are provided on both sides of the bosses, located outside the bosses. Gaskets 3 are provided at opposite ends of the inner sides of the two flanges 2. A plurality of mounting holes are evenly distributed around the circumference of the flanges 2 and gaskets 3, with the mounting holes corresponding to the bolt holes. Bolts 4 are fitted into each mounting hole and bolt hole, and nuts 5 are correspondingly provided on the bolts 4. Based on embodiment 1, in this embodiment, the two connecting pipes 1 are connected using a hot-melt connection process. One end of the connecting pipe 1 is hot-melted to expand its diameter and folded outwards, the inner lining of the connecting pipe 1 is fused together, and the joint is hot-melted and extruded to form a boss.

[0021] Example 3 This utility model is used for a thermoplastic reinforced composite pipe connection device, including two connecting pipes 1. Connecting bosses are integrally formed at opposite ends of the two connecting pipes 1, surrounding the outer edge of the end of the connecting pipe 1. Several bolt holes are evenly distributed around the circumference of the bosses. Flanges 2 are provided on both sides of the bosses, located outside the bosses. Gaskets 3 are provided at opposite ends of the inner sides of the two flanges 2. Several mounting holes are evenly distributed around the circumference of the flanges 2 and gaskets 3, with the mounting holes corresponding to the bolt holes. Bolts 4 are fitted into each mounting hole and bolt hole, and nuts 5 are correspondingly provided on the bolts 4. The two connecting pipes 1 are connected using a hot-melt connection process, where one end of the connecting pipe 1 is hot-melted to expand its diameter and folded outwards, the inner lining layers of the connecting pipe 1 are fused together, and the joint is hot-melted and extruded to form a boss. Based on embodiment 2, in this embodiment, the inner circumference of the flange 2 is provided with an arc-shaped chamfer edge, such as... Figure 4 As shown, the inner ring of flange 2 contacts the outer side of the boss, and its shape is adapted to the outer side of the boss. The arc-shaped chamfer edge of the inner ring of flange 2 is engaged with the hot-melt bend of connecting pipe 1, achieving an effective sealing effect and significantly improving tensile strength, thus achieving an effective sealing effect.

[0022] Example 4 This utility model relates to a connection device for thermoplastic reinforced composite pipes, comprising two connecting pipes 1. Connecting bosses are integrally formed at opposite ends of the two connecting pipes 1, surrounding the outer edge of the ends of the connecting pipes 1. Several bolt holes are evenly distributed around the circumference of the bosses. Flanges 2 are provided on both sides of the bosses, located outside the bosses. Gaskets 3 are provided at opposite ends of the inner sides of the two flanges 2. Several mounting holes are evenly distributed around the circumference of the flanges 2 and gaskets 3, corresponding to the bolt holes. Bolts 4 are fitted into each mounting hole and bolt hole, and nuts 5 are correspondingly provided on the bolts 4. The two connecting pipes 1 are connected using a hot-melt connection process, where one end of the connecting pipe 1 is hot-melted to expand its diameter and folded outwards, fusing the inner lining layers of the connecting pipe 1 together. The joint is formed by hot-melt extrusion to create the boss. The inner ring of the flange 2 has an arc-shaped chamfered edge around its circumference, and the inner ring of the flange 2 contacts the outer side of the boss, matching the shape of the outer side of the boss. The inner chamfered edge of flange 2 is aligned with the heat-fused bend of connecting pipe 1. Based on embodiment 3, in this embodiment, the inner sides of the two gaskets 3 respectively abut against the heat-fused bend of connecting pipe 1. Flange 2 and gaskets 3 ensure that connecting pipe 1 is protected from mechanical damage at the root of the boss during connection.

[0023] Example 5 This utility model relates to a connection device for thermoplastic reinforced composite pipes, comprising two connecting pipes 1. Connecting bosses are integrally formed at opposite ends of the two connecting pipes 1, surrounding the outer edge of the connecting pipe 1 ends. Several bolt holes are evenly distributed around the circumference of the bosses. Flanges 2 are provided on both sides of the bosses, located outside the bosses. Gaskets 3 are provided at opposite ends of the inner sides of the two flanges 2. Several mounting holes are evenly distributed around the circumference of the flanges 2 and gaskets 3, corresponding to the bolt holes. Bolts 4 are fitted into each mounting hole and bolt hole, and nuts 5 are correspondingly provided on the bolts 4. The two connecting pipes 1 are connected using a hot-melt connection process, where one end of the connecting pipe 1 is hot-melted to expand its diameter and folded outwards. The inner lining of the connecting pipe 1 is fused together, and the joint is hot-melted and extruded to form the boss. An arc-shaped chamfer is provided around the inner circumference of the flange 2, and the inner ring of the flange 2 contacts the outer side of the boss, matching the shape of the outer side of the boss. The arc-shaped chamfer of the inner ring of the flange 2 is tangent to the hot-melt bend of the connecting pipe 1, and the inner sides of the two gaskets 3 abut against the hot-melt bend of the connecting pipe 1. Based on Example 4, in this example, the gasket 3 is made of elastic material, which plays a buffering role. The inner ring of the gasket 3 is not easily deformed. The elastic expansion is close to the heat-melting bend of the connecting pipe 1. Due to the elastic effect, it has an outward expansion force applied to the inner wall of the inner ring. During the heat-melting process, it can prevent deformation and unevenness, resulting in higher structural strength.

[0024] Example 6 This utility model relates to a connection device for thermoplastic reinforced composite pipes, comprising two connecting pipes 1. Connecting bosses are integrally formed at opposite ends of the two connecting pipes 1, surrounding the outer edge of the connecting pipe 1 ends. Several bolt holes are evenly distributed around the circumference of the bosses. Flanges 2 are provided on both sides of the bosses, located outside the bosses. Gaskets 3 are provided at opposite ends of the inner sides of the two flanges 2. Several mounting holes are evenly distributed around the circumference of the flanges 2 and gaskets 3, corresponding to the bolt holes. Bolts 4 are fitted into each mounting hole and bolt hole, and nuts 5 are correspondingly provided on the bolts 4. The two connecting pipes 1 are connected using a hot-melt connection process, where one end of the connecting pipe 1 is hot-melted to expand its diameter and folded outwards. The inner lining of the connecting pipe 1 is fused together, and the joint is hot-melted and extruded to form the boss. An arc-shaped chamfer is provided around the inner circumference of the flange 2, and the inner ring of the flange 2 contacts the outer side of the boss, matching the shape of the outer side of the boss. The arc-shaped chamfer of the inner ring of the flange 2 is tangent to the hot-melt bend of the connecting pipe 1, and the inner sides of the two gaskets 3 abut against the hot-melt bend of the connecting pipe 1. The gasket 3 is made of elastic material. Based on embodiment 5, in this embodiment, four bolt holes are opened on the bosses of the two connecting pipes 1. Two gaskets 3 are installed opposite each other inside the two flanges 2. The inner side of the gasket 3 abuts against the bend of the connecting pipe 1. The flanges 2 and gaskets 3 have four mounting holes. One end of the bolt 4 passes through the mounting holes and bolt holes and is connected to the nut 5. The bolt 4 and nut 5 can make the two connecting pipes 1, flanges 2 and gaskets 3 a tightly connected structure after heat fusion, and they will not be separated, thereby improving the structural strength.

[0025] Example 7 This utility model relates to a connection device for thermoplastic reinforced composite pipes, comprising two connecting pipes 1. Connecting bosses are integrally formed at opposite ends of the two connecting pipes 1, surrounding the outer edge of the connecting pipe 1 ends. Several bolt holes are evenly distributed around the circumference of the bosses. Flanges 2 are provided on both sides of the bosses, located outside the bosses. Gaskets 3 are provided at opposite ends of the inner sides of the two flanges 2. Several mounting holes are evenly distributed around the circumference of the flanges 2 and gaskets 3, corresponding to the bolt holes. Bolts 4 are fitted into each mounting hole and bolt hole, and nuts 5 are correspondingly provided on the bolts 4. The two connecting pipes 1 are connected using a hot-melt connection process, where one end of the connecting pipe 1 is hot-melted to expand its diameter and folded outwards. The inner lining of the connecting pipe 1 is fused together, and the joint is hot-melted and extruded to form the boss. An arc-shaped chamfer is provided around the inner circumference of the flange 2, and the inner ring of the flange 2 contacts the outer side of the boss, matching the shape of the outer side of the boss. The arc-shaped chamfer of the inner ring of the flange 2 is tangent to the hot-melt bend of the connecting pipe 1, and the inner sides of the two gaskets 3 abut against the hot-melt bend of the connecting pipe 1. Four bolt holes are made on the bosses of the two connecting pipes 1. Two gaskets 3 are installed opposite each other inside the two flanges 2. The inner side of the gaskets 3 abuts against the bend of the connecting pipe 1. Four mounting holes are made on the flanges 2 and the gaskets 3. One end of the bolt 4 passes through the mounting holes and bolt holes and is connected to the nut 5. Based on embodiment 6, the gasket 3 in this embodiment adopts a perfluororubber O-ring.

[0026] Example 8 This utility model relates to a connection device for thermoplastic reinforced composite pipes, comprising two connecting pipes 1. Connecting bosses are integrally formed at opposite ends of the two connecting pipes 1, surrounding the outer edge of the connecting pipe 1 ends. Several bolt holes are evenly distributed around the circumference of the bosses. Flanges 2 are provided on both sides of the bosses, located outside the bosses. Gaskets 3 are provided at opposite ends of the inner sides of the two flanges 2. Several mounting holes are evenly distributed around the circumference of the flanges 2 and gaskets 3, corresponding to the bolt holes. Bolts 4 are fitted into each mounting hole and bolt hole, and nuts 5 are correspondingly provided on the bolts 4. The two connecting pipes 1 are connected using a hot-melt connection process, where one end of the connecting pipe 1 is hot-melted to expand its diameter and folded outwards. The inner lining of the connecting pipe 1 is fused together, and the joint is hot-melted and extruded to form the boss. An arc-shaped chamfer is provided around the inner circumference of the flange 2, and the inner ring of the flange 2 contacts the outer side of the boss, matching the shape of the outer side of the boss. The arc-shaped chamfer of the inner ring of the flange 2 is tangent to the hot-melt bend of the connecting pipe 1, and the inner sides of the two gaskets 3 abut against the hot-melt bend of the connecting pipe 1. Gasket 3 is made of elastic material. Four bolt holes are opened on the bosses of the two connecting pipes 1. Two gaskets 3 are installed opposite each other inside the two flanges 2. The inner side of the gasket 3 abuts against the bend of the connecting pipe 1. Four mounting holes are opened on the flanges 2 and gaskets 3. One end of the bolt 4 passes through the mounting holes and bolt holes and is connected with the nut 5. Gasket 3 uses a perfluororubber O-ring. Based on embodiment 7, in this embodiment, the inner surfaces of both flanges 2 are provided with an anti-corrosion coating.

[0027] The working principle of this utility model for connecting thermoplastic reinforced composite pipes is as follows: Through a hot-melt connection process, the two connecting pipes 1 are integrally fused, forming a single solid boss at their opposite ends. This allows the lining material and reinforcing fibers to completely fuse in the molten state, eliminating any weak interfaces and preventing leakage at the structural root. Bolts 4 are inserted into the mounting holes of the flange 2, gasket 3, and the boss, and then nuts 5 are used to lock one end of the bolts 4, thus fixing the two connecting pipes 1 together. This directly converts the axial tensile force into shear resistance at the root of the boss.

[0028] The manufacturing process of this utility model for a thermoplastic reinforced composite pipe connection device is as follows: Before operation, the mating surfaces, milling cutters, and heating elements at the ends of the two connecting pipes 1 are cleaned, and the flatness of the welding interface is ensured by end face milling. Both connecting pipes 1 are heated by a horn-shaped mold for a hot melt machine using a horn-shaped heating plate. The joint of the two connecting pipes 1 is hot melted and expanded, and gradually folded outward. The connecting pipes 1 are squeezed together and fused. The horn-shaped mold forms a flat boss at the joint of the connecting pipes 1. After reaching the preset temperature, it is installed in the welding equipment. In the initial pressing stage, the pipe end material is melted to form a preliminary fusion flange. Then, the heat conduction pressure mode is switched to maintain sufficient heat exchange. The mold for shaping the boss is installed, the pipe ends are accurately aligned, and a constant butt joint pressure is applied until the weld is completely cured. After the joint cools and solidifies to achieve complete solidification, four bolt holes are evenly drilled at the bosses of the two connecting pipes 1.

[0029] In use, before the hot-melt connection process, flange 2 and gasket 3 are pre-fitted onto both ends of the unconnected connecting pipe 1. After the hot-melt connection, the two gaskets 3 are joined together near the boss of the connecting pipe 1. The inner ring of the two flanges 2 is chamfered to clamp the boss of the connecting pipe 1. Bolts 4 are inserted between the four mounting holes to connect the two flanges 2 together. Then, the bolts 4 are locked with nuts 5. Through the hot-melt connection process, the opposite ends of the two connecting pipes 1 are hot-melted as a whole to form a single solid boss. From the structural root, the leakage path is eliminated. The bolts 4 are vertically anchored to the boss body, and the axial tensile force is directly converted into the shear force at the root of the boss. The tensile efficiency is qualitatively improved, and an effective sealing effect is achieved.

[0030] The assembly process of the thermoplastic reinforced composite pipe connection device of this utility model is as follows: after the two connecting pipes 1 are heat-fused together, four bolt holes are evenly distributed around the boss. The flange 2 is installed on the boss formed by the heat fusion of the composite pipe heat-fused connecting pipe fitting 1. There is a gasket 3 between the flange 2 and the composite pipe heat-fused connecting pipe 1. The bolts 4 and nuts 5 connect the flange 2, the gasket 3 and the composite pipe heat-fused connecting pipe 1.

[0031] This utility model is used for a thermoplastic reinforced composite pipe connection device. It has a simple structure, is easy to use, and ensures the internal quality of the joint. This makes the connection between the pipe joint and the pipe body tighter and has high overall strength and long service life. It not only improves the construction quality and efficiency of connecting two pipes and greatly reduces construction costs, but also has low skill requirements for construction personnel, thus ensuring the safety of engineering applications. It is very conducive to engineering applications and promotion.

Claims

1. A connection device for thermoplastic reinforced composite pipes, characterized in that, It includes two connecting pipes (1), and the two connecting pipes (1) are integrally formed with connecting bosses at opposite ends. The bosses are arranged around the outer edge of the end of the connecting pipe (1). Several bolt holes are evenly arranged around the circumference of the bosses. Flanges (2) are provided on both sides of the bosses. The flanges (2) are located outside the bosses. Gaskets (3) are provided on opposite ends of the inner sides of the two flanges (2). Several mounting holes are evenly arranged around the flanges (2) and gaskets (3). The mounting holes are corresponding to the bolt holes. Bolts (4) are fitted into each mounting hole and bolt hole. Nuts (5) are correspondingly provided on the bolts (4).

2. The thermoplastic reinforced composite pipe connecting device according to claim 1, characterized in that, The two connecting pipes (1) are connected by a hot melt connection process. One end of the connecting pipe (1) is hot melted to expand its diameter and folded outward. The inner lining of the connecting pipe (1) is connected and fused together, and the joint is hot melted and extruded to form a boss.

3. The thermoplastic reinforced composite pipe connecting device according to claim 2, characterized in that, The inner ring of flange (2) is provided with an arc-shaped chamfer edge in the circumference. The inner ring of flange (2) contacts the outer side of the boss and is adapted to the shape of the outer side of the boss.

4. The thermoplastic reinforced composite pipe connecting device according to claim 3, characterized in that, The inner ring of the flange (2) is tangent to the hot-melt bend of the connecting pipe (1).

5. The thermoplastic reinforced composite pipe connecting device according to claim 4, characterized in that, The inner sides of the two gaskets (3) respectively abut against the heat-melted bend of the connecting pipe (1).

6. The thermoplastic reinforced composite pipe connecting device according to claim 5, characterized in that, The gasket (3) is made of elastic material.

7. The thermoplastic reinforced composite pipe connecting device according to claim 6, characterized in that, Four bolt holes are made on the boss of the two connecting pipes (1). Two gaskets (3) are installed opposite each other inside the two flanges (2). The inner side of the gasket (3) abuts against the bend of the connecting pipe (1). Four mounting holes are made on the flanges (2) and the gaskets (3). One end of the bolt (4) passes through the mounting hole and the bolt hole and is connected to the nut (5).

8. The thermoplastic reinforced composite pipe connecting device according to claim 7, characterized in that, Gasket (3) uses a perfluororubber O-ring.

9. The thermoplastic reinforced composite pipe connecting device according to claim 8, characterized in that, The inner surfaces of both flanges (2) are coated with anti-corrosion coating.

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