A flexible composite liner pipe

Abstract

This utility model discloses a flexible composite inner liner pipe, relating to the field of inner liner pipe technology. The utility model includes an outer pipe and a connector. The outer surface of the outer pipe is provided with a first fixing ring and a second fixing ring. A first connecting block is installed on the outer surface of the first fixing ring, and a second connecting block is installed on the outer surface of the second fixing ring. A screw is fixed to one side of the first connecting block. This utility model, through the inclusion of an embedded groove, a first connecting block, a second connecting block, a through hole, a screw, a nut, an inner groove, and an elastic ring, allows for adaptive deformation of the elastic ring during installation as the connector is inserted into the embedded groove. Once inserted into place, the elastic ring and the surface ring of the connector form a tight engagement, providing both pre-fixation and blocking leakage paths. Simultaneously, one end of the inner pipe is inserted into the inner groove, further enhancing the sealing performance between the pipe and the connector through this double-fitting structure.

Description

Technical Field

[0001] This utility model relates to the field of inner lining tube technology, specifically a flexible composite inner lining tube. Background Technology

[0002] To extend the service life of pipelines, engineers invented a technique of lining the inside of pipelines that transport media. This involves covering the inner wall of the pipeline with a lining made of corrosion-resistant and wear-resistant material, preventing the transported media from directly contacting the pipeline and thus protecting it from corrosion and wear, thereby increasing its service life. Currently, the widely used technology of lining pipelines with composite flexible hoses is one such example.

[0003] Existing lined spigot and pipe systems are mostly used in underground pipeline systems (such as water supply and drainage). The spigot and spigot are often fixed with a single adhesive. However, the humidity fluctuations and temperature changes in the underground soil environment (such as seasonal freeze-thaw cycles and the influence of environmental heat sources) can easily lead to the aging and failure of the adhesive, resulting in a decrease in adhesion. This can cause the spigot and spigot to loosen and the sealing performance to weaken, affecting the stability of pipeline operation. At the same time, these lined spigot and pipe systems generally adopt a double-layer composite structure. The outer layer is usually a polyethylene plastic pipe and the inner layer is a cast iron pipe. Since the traditional inner metal pipe is often made of high-rigidity and high-hardness materials, its deformation capacity is significantly different from that of the outer plastic pipe due to thermal expansion and contraction caused by temperature changes. After long-term use, stress concentration is likely to occur at the interface between the two materials, eventually causing the plastic pipe and the metal pipe to delaminate and separate, further weakening the structural strength and reliability of the outer pipe. Utility Model Content

[0004] Therefore, the purpose of this utility model is to provide a flexible composite inner liner tube to solve the technical problems mentioned in the background art.

[0005] To achieve the above objectives, this utility model provides the following technical solution: a flexible composite inner liner tube, comprising an outer tube and a connector. The outer surface of the outer tube is provided with a first fixing ring and a second fixing ring, respectively. A first connecting block is installed on the outer surface of the first fixing ring, and a second connecting block is installed on the outer surface of the second fixing ring. A screw is fixed on one side of the first connecting block, and a through hole is passed through one side of the second connecting block. A nut is threaded onto the outer surface of the screw. An inner tube is provided inside the outer tube, and embedded grooves are opened at both ends of the outer tube. An elastic ring is provided on the inner wall of the embedded groove. The outer surface of the connector is provided with a bone ring, and the inner wall of the connector is provided with an inner groove.

[0006] Furthermore, the outer surface of the outer tube is provided with a heat insulation layer, and the heat insulation layer is made of glass fiber cloth.

[0007] By adopting the above technical solution, the influence of external temperature changes on the pipe body is weakened by covering it with a glass fiber cloth insulation layer, which helps to avoid delamination problems caused by temperature difference deformation between the outer and inner pipes.

[0008] Furthermore, the inner tube is made of 304 stainless steel.

[0009] By adopting the above technical solution, the 304 stainless steel, which combines flexibility and structural strength, can replace the traditional high-rigidity metal inner tube. Through the adaptability and deformation capability of 304 stainless steel, it can change synchronously with the thermal expansion and contraction of the outer tube, thus helping to avoid delamination between layers.

[0010] Furthermore, the inner wall of the inner tube is coated with an anti-corrosion layer, and the anti-corrosion layer is made of polytetrafluoroethylene.

[0011] By adopting the above technical solution, the inner wall anti-corrosion layer isolates the inner pipe from direct contact with the conveying medium, preventing the inner pipe from rusting due to medium erosion, while ensuring the structural stability of the inner pipe and further extending the overall service life of the composite pipe.

[0012] Furthermore, the elastic ring is provided in multiple sets, and one side of each set of elastic rings is inclined at 45°. The elastic ring is made of EPDM rubber.

[0013] By adopting the above technical solution, the high elasticity and aging resistance of EPDM rubber are utilized, along with a 45° inclined structure to facilitate deformation guidance during insertion and rapid rebound after insertion. Through the synergistic effect of multiple sets of inclined elastic rings, the sealing and limiting stability of the contact with the connector's core ring are enhanced, the ease of insertion operation is improved, and the reliability of the connection between the tube body and the connector is further strengthened.

[0014] Furthermore, the connector is adapted to the recessed groove, and the inner tube is adapted to the inner connection groove.

[0015] By adopting the above technical solutions, the compatibility can ensure that the connector can be smoothly inserted into the inner groove and the inner tube can be accurately embedded into the inner connection groove, thus achieving initial stable assembly and reducing connection gaps.

[0016] Furthermore, the inner groove is provided with a sealing ring, and the sealing ring is made of nitrile rubber material.

[0017] By adopting the above technical solution, the nitrile rubber sealing ring can tightly fit the mating surface of the inner tube and the inner groove, fill the gap to enhance the sealing effect, and effectively prevent the conveying medium from leaking from the connection between the inner tube and the inner groove.

[0018] Furthermore, the screw and nut are provided in multiple sets, and the multiple sets of screw and nut are distributed in a ring shape at equal intervals.

[0019] By adopting the above technical solution, multiple sets of evenly distributed screws and nuts generate a uniform locking force during tightening, avoiding deformation or loosening of the connection parts caused by localized force concentration.

[0020] In summary, the present invention has the following main advantages: 1. This utility model comprises an embedded groove, a first connecting block, a second connecting block, a through hole, a screw, a nut, an inner groove, and an elastic ring. During installation, as the worker inserts the connector into the embedded groove, the elastic ring undergoes adaptive deformation under compression. After insertion, the elastic ring and the surface ring of the connector form a tight engagement, which serves both as a pre-fixation and as a blockage of leakage paths. Simultaneously, one end of the inner tube is inserted into the inner groove, further enhancing the sealing performance of the pipe and connector through the double-fit structure. After the connector completes the initial assembly of the two sets of pipes, the screw of the first connecting block on one set of pipes can be precisely inserted into the through hole of the second connecting block on the other set of pipes. After the worker tightens the nut, the two sets of pipes will form a symmetrical squeezing force on the connector, effectively eliminating connection gaps and strengthening the mechanical locking effect. This significantly improves the firmness and long-term stability of the connection between the pipe and the connector, effectively avoiding the risk of detachment caused by changes in soil temperature and humidity, external disturbances, etc. 2. This utility model incorporates a heat insulation layer, with the inner tube made of 304 stainless steel flexible metal material. The heat insulation layer effectively blocks heat from the external environment (such as high surface temperatures in summer, industrial heat sources, or abnormal local soil temperatures) from being conducted into the tube body, significantly reducing the impact of external thermal shock on the tube body. This reduces the deformation difference between the outer and inner tubes due to temperature differences from the source. 304 stainless steel has both good flexibility and structural strength. When temperature changes cause thermal expansion and contraction, it can deform synchronously with the deformation trend of the outer plastic tube. The heat insulation layer blocks the intrusion of external heat to reduce the temperature fluctuation of the tube body. Furthermore, the adaptability of the flexible metal inner tube eliminates the relative displacement between the outer and inner tubes, thereby fundamentally and effectively avoiding the delamination problem caused by temperature changes. This significantly improves the structural stability, reliability, and service life of the composite pipe. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the structure of this utility model; Figure 2 This is a schematic diagram of the connector structure of this utility model; Figure 3 This is a schematic diagram of the cross-sectional structure of the outer tube of this utility model; Figure 4 This is a schematic diagram of the embedded groove structure of this utility model; Figure 5 This is a schematic diagram of the screw structure of this utility model.

[0022] In the diagram: 1. Outer tube; 2. Connector; 3. First fixing ring; 4. Second fixing ring; 5. Inner tube; 6. Embedded groove; 7. First connecting block; 8. Second connecting block; 9. Screw; 10. Elastic ring; 11. Inner groove; 12. Sealing ring; 13. Bone ring; 14. Heat insulation layer; 15. Anti-corrosion layer; 16. Through hole; 17. Nut. Detailed Implementation

[0023] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and should not be construed as limiting the present invention.

[0024] The embodiments of this utility model will be described below based on its overall structure.

[0025] Example 1: A flexible composite liner tube, such as Figures 1-5As shown, the device includes an outer tube 1 and a connector 2. The outer surface of the outer tube 1 is provided with a first fixing ring 3 and a second fixing ring 4. A first connecting block 7 is installed on the outer surface of the first fixing ring 3, and a second connecting block 8 is installed on the outer surface of the second fixing ring 4. A screw 9 is fixed to one side of the first connecting block 7, and a through hole 16 is passed through one side of the second connecting block 8. A nut 17 is threaded onto the outer surface of the screw 9. An inner tube 5 is provided inside the outer tube 1. The inner tube 5 is made of 304 stainless steel and is reinforced with... Manufactured using 304 stainless steel, which combines flexibility and structural strength, this composite pipe replaces the traditional high-rigidity metal inner tube 5. The adaptability and deformation capacity of 304 stainless steel allow it to expand and contract synchronously with the thermal expansion and contraction of the outer tube 1, helping to prevent delamination. The inner wall of the inner tube 5 is coated with an anti-corrosion layer 15, which is made of polytetrafluoroethylene (PTFE). This anti-corrosion layer 15 isolates the inner tube 5 from direct contact with the transported medium, preventing corrosion caused by the medium and ensuring the structural stability of the inner tube 5, further extending the overall lifespan of the composite pipe. To extend the service life, the outer tube 1 has embedded grooves 6 at both ends. The inner wall of each embedded groove 6 is provided with elastic rings 10. Multiple sets of elastic rings 10 are provided, with one side of each set inclined at 45°. The elastic rings 10 are made of EPDM rubber. Utilizing the high elasticity and aging resistance of EPDM rubber, combined with the 45° inclined structure, it facilitates deformation guidance during insertion of the connector 2 and rapid rebound after insertion. Through the synergistic effect of multiple sets of inclined elastic rings 10, it enhances the sealing and limiting of the contact with the connector 2's core ring 13. This not only improves the stability of the connection but also enhances the convenience of the insertion operation, further strengthening the reliability of the connection between the tube body and the connector 2. The outer surface of the connector 2 is provided with a bone ring 13, and the inner wall of the connector 2 is provided with an inner groove 11. The inner groove 11 is provided with a sealing ring 12, which is made of nitrile rubber. The nitrile rubber sealing ring 12 can tightly fit the mating surface of the inner tube 5 and the inner groove 11, filling the gap to enhance the sealing effect and effectively preventing the conveying medium from leaking from the connection between the inner tube 5 and the inner groove 11.

[0026] See Figures 2-3 In the above embodiment, the plug 2 is adapted to the inner groove 6, and the inner tube 5 is adapted to the inner connection groove 11. The compatibility can ensure that the plug 2 is smoothly inserted into the inner groove 6 and the inner tube 5 is accurately embedded in the inner connection groove 11, so as to achieve preliminary stable assembly and reduce connection gap.

[0027] See Figures 1-3 In the above embodiments, multiple sets of screws 9 and nuts 17 are provided, and the multiple sets of screws 9 and nuts 17 are distributed in a ring shape at equal intervals. When tightening, the multiple sets of evenly distributed screws 9 and nuts 17 generate a uniform locking force, avoiding deformation or loosening of the connection parts caused by local force concentration.

[0028] Example 2: To further reduce the impact of thermal expansion and contraction caused by external factors, Example 2 is an improvement on Example 1. (See attached document.) Figure 5 The outer surface of the outer tube 1 is provided with a heat insulation layer 14, which is made of glass fiber cloth. By covering the outer tube with the glass fiber cloth heat insulation layer 14, the influence of external temperature changes on the tube body is weakened, and the delamination problem caused by temperature difference deformation between the outer tube 1 and the inner tube 5 is avoided.

[0029] The implementation principle of this utility model is as follows: During operation, the operator first inserts the connector 2 into the inner groove 6 of the outer tube 1. The elastic ring 10 is compressed and deformed, guiding the insertion. After it is in place, the elastic ring 10 and the bone ring 13 engage and abut to achieve pre-fixation and initial sealing. At the same time, one end of the inner tube 5 is simultaneously inserted into the inner groove 11 of the connector 2, and the sealing ring 12 tightly fits the mating surfaces of the two to enhance the sealing effect. After the connector 2 completes the initial assembly of the two sets of tubes, the screw 9 on the first connecting block 7 of one set of tubes is inserted into the through hole 1 of the second connecting block 8 of the other set of tubes. 6. Tighten the nut 17 to make the two sets of pipes form a symmetrical squeezing force on the connector 2, eliminate the connection gap and achieve a mechanically secure lock. In addition, the glass fiber cloth insulation layer 14 of the outer pipe 1 can effectively block the conduction of external heat and reduce the impact of ambient temperature fluctuations on the pipe body. The 304 stainless steel of the inner pipe 5 has good flexibility and deforms synchronously with the thermal expansion and contraction of the outer pipe 1, avoiding stress concentration caused by the difference in deformation between the two and delamination. The polytetrafluoroethylene anti-corrosion layer 15 on the inner wall of the inner pipe 5 can isolate the conveying medium from direct contact with the inner pipe 5 and prevent the inner pipe 5 from corroding.

[0030] Although embodiments of the present invention have been shown and described, these specific embodiments are merely explanations of the present invention and are not intended to limit the invention. The specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. After reading this specification, those skilled in the art may make modifications, substitutions, and variations to the embodiments as needed without departing from the principles and spirit of the present invention, provided that such modifications, substitutions, and variations are within the scope of the claims of the present invention and are protected by patent law.

Claims

1. A flexible composite inner liner tube, comprising an outer tube (1) and a connector (2), characterized in that: The outer surface of the outer tube (1) is provided with a first fixing ring (3) and a second fixing ring (4). The outer surface of the first fixing ring (3) is provided with a first connecting block (7), and the outer surface of the second fixing ring (4) is provided with a second connecting block (8). A screw (9) is fixed on one side of the first connecting block (7), and a through hole (16) is passed through one side of the second connecting block (8). A nut (17) is threaded onto the outer surface of the screw (9). The inner tube (5) is provided inside the outer tube (1). An embedded groove (6) is provided at both ends of the outer tube (1). An elastic ring (10) is provided on the inner wall of the embedded groove (6). The outer surface of the connector (2) is provided with a bone ring (13), and the inner wall of the connector (2) is provided with an inner groove (11).

2. The flexible composite liner tube according to claim 1, characterized in that: The outer surface of the outer tube (1) is provided with a heat insulation layer (14), and the heat insulation layer (14) is made of glass fiber cloth.

3. The flexible composite liner tube according to claim 1, characterized in that: The inner tube (5) is made of 304 stainless steel.

4. The flexible composite liner tube according to claim 1, characterized in that: The inner wall of the inner tube (5) is coated with an anti-corrosion layer (15), and the anti-corrosion layer (15) is made of polytetrafluoroethylene.

5. The flexible composite liner tube according to claim 1, characterized in that: The elastic ring (10) is provided in multiple sets, and one side of the multiple sets of elastic rings (10) is inclined at 45°. The elastic ring (10) is made of EPDM rubber.

6. The flexible composite liner tube according to claim 1, characterized in that: The connector (2) is adapted to the inner groove (6), and the inner tube (5) is adapted to the inner groove (11).

7. The flexible composite liner tube according to claim 1, characterized in that: The inner groove (11) is provided with a sealing ring (12), and the sealing ring (12) is made of nitrile rubber material.

8. The flexible composite liner tube according to claim 1, characterized in that: The screw (9) and nut (17) are provided in multiple sets, and the multiple sets of screw (9) and nut (17) are distributed in a ring shape at equal intervals.

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