FEP pipe with good corrosion resistance

Abstract

The utility model discloses a good anticorrosive FEP pipeline, including first pipeline and second pipeline, all be equipped with inner layer pipe, intermediate layer pipe and outer layer pipe in first pipeline and second pipeline, first pipeline and second pipeline junction place fixed mounting has first snap ring, second pipeline and first pipeline junction place fixed mounting has two second snap rings, first pipeline and second pipeline are through first snap ring and second snap ring swing joint, all fixed mounting have sealing rubber ring on first snap ring and second snap ring, fixed mounting has the installing rod on first pipeline, the first adjusting rod of sliding installation has in the installing rod, the second adjusting rod of sliding installation has in the first adjusting rod, through the composite structure of optimization FEP pipeline, effectively solved the problem of traditional pipeline mechanical strength deficiency, easy deformation failure, adopt modular connection mode, overcame the defect that traditional welding or adhesive technology easily damaged material, introduced the hidden danger of leakage.

Description

Technical Field

[0001] This utility model relates to the field of FEP pipe technology, specifically to an FEP pipe with good corrosion resistance. Background Technology

[0002] In the fields of machinery manufacturing, chemical processes, and high-purity fluid transportation, FEP (fluorinated ethylene propylene copolymer) pipes, with their excellent chemical stability, extremely low surface energy, and superior temperature resistance (-200℃ to +200℃), have become the preferred material for transporting highly corrosive media, ultrapure chemicals, and high-temperature fluids. Compared to PTFE (polytetrafluoroethylene), FEP not only inherits the acid and alkali resistance and organic solvent resistance of fluoroplastics, but also possesses better melt processing performance, allowing for the fabrication of complex pipe diameter structures through extrusion molding.

[0003] Traditional FEP pipes suffer from insufficient mechanical strength and are prone to deformation or bending failure due to external forces. Their reliability is significantly reduced, especially under high pressure or dynamic conditions. In addition, conventional pipes often use welding or adhesive bonding to connect flanges. These secondary processing methods can damage materials and introduce leakage risks, making the pipes susceptible to corrosion during subsequent use. Utility Model Content

[0004] The purpose of this invention is to provide an FEP pipe with good corrosion resistance to solve the problems mentioned in the background art.

[0005] To achieve the above objectives, this utility model provides the following technical solution: a corrosion-resistant FEP pipe, comprising a first pipe and a second pipe, both the first and second pipes having an inner layer pipe, a middle layer pipe, and an outer layer pipe; a first retaining ring fixedly installed at the connection between the first and second pipes; two sets of second retaining rings fixedly installed at the connection between the second and first pipes; the first and second pipes being movably engaged by the first and second retaining rings; sealing rubber rings fixedly installed on both the first and second retaining rings; an installation rod fixedly installed on the first pipe; a first adjusting rod slidably installed inside the installation rod; a second adjusting rod slidably installed inside the first adjusting rod; an installation seat fixedly installed at the end of the second adjusting rod away from the installation rod; the installation seat slidably engaging with the second pipe; multiple sets of annularly distributed retaining plates inside the installation seat; and retaining grooves on the second pipe, with the multiple sets of retaining plates movably engaging with the second pipe through the retaining grooves.

[0006] As a further preferred embodiment of this technical solution, a screw is rotatably installed inside the mounting rod, the screw passes through the first adjusting rod and is threadedly connected to the first adjusting rod, and a screw tube is rotatably installed inside the first adjusting rod, the screw tube passes through the second adjusting rod and is threadedly connected to the second adjusting rod.

[0007] As a further preferred embodiment of this technical solution, the screw is provided with two sets of symmetrically distributed keyways, and the spiral tube is provided with two sets of symmetrically distributed key blocks. The key blocks and keyways are correspondingly arranged, and the spiral tube is slidably sleeved with the screw through the key blocks and keyways.

[0008] As a further preferred embodiment of this technical solution, an installation ring is rotatably installed inside the mounting base, and a toothed ring is sleeved on the mounting ring. Multiple sets of clamping plates are rotatably connected to the mounting base via handles. Multiple sets of handles are distributed in a ring around the mounting ring, and a first gear is sleeved on each of the multiple sets of handles. Four sets of symmetrically distributed slots are provided on the upper handle.

[0009] As a further preferred embodiment of this technical solution, multiple sets of the first gears are meshed with the gear ring, and multiple sets of the handles are fitted with a first torsion spring, with the two ends of the first torsion spring being fixedly connected to the first gear and the mounting base, respectively.

[0010] As a further preferred embodiment of this technical solution, two sets of slides are slidably installed in the mounting base. The two sets of slides can be movably engaged with the handle via slots. A rack is fixedly installed on each set of slides, and a second gear is provided between the two sets of racks. The second gear meshes with the two sets of racks respectively. The second gear is rotatably connected to the mounting base via a rotating rod. A second torsion spring is sleeved on the rotating rod, and the two ends of the second torsion spring are fixedly connected to the second gear and the mounting base respectively. The two sets of slides are centrally symmetrically distributed through the rotating rod. Two sets of slide rods corresponding to the slides are fixedly installed in the mounting base.

[0011] As a further preferred embodiment of this technical solution, the slide is slidably sleeved with the corresponding slide rod, and two sets of symmetrically distributed springs are sleeved on the slide rod. The two ends of the two sets of springs are respectively fixedly connected to the corresponding slide and the mounting base.

[0012] This utility model provides an FEP pipe with good corrosion resistance, which has the following beneficial effects:

[0013] (1) This utility model effectively solves the problems of insufficient mechanical strength and easy deformation failure of traditional pipes by optimizing the composite structure of FEP pipes; the inner pipe is made of pure FEP material to ensure excellent corrosion resistance and resist strong acid, strong alkali and organic solvent erosion; the middle pipe is doped with 5% to 10% short carbon fiber, which significantly improves the compressive strength without affecting the flexibility, making it suitable for high pressure or dynamic working conditions; the outer pipe is added with anti-UV agents such as nano titanium dioxide to enhance outdoor weather resistance and delay aging; at the same time, the combination design of the first retaining ring, the second retaining ring and the sealing rubber ring further enhances the sealing performance and avoids the risk of corrosion caused by media leakage, thereby greatly improving the long-term reliability of the pipe.

[0014] (2) This utility model adopts a modular connection method, overcoming the defects of traditional welding or gluing processes that easily damage materials and introduce leakage risks. The screw-tube linkage mechanism inside the mounting rod drives the adjustment rod to extend and retract, so that the clamping plate on the mounting base can quickly and accurately engage with the groove of the second pipe, realizing convenient pipe assembly. After installation, the mechanical self-locking mechanism of the slide and the slot automatically fixes the position of the clamping plate to prevent loosening and ensure the long-term stability of the connection under high pressure or vibration environment. It not only avoids the damage to materials caused by secondary processing, but also significantly improves the installation efficiency and sealing reliability, and is suitable for long-term use under harsh working conditions. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0016] Figure 2 This is a schematic diagram showing the structural separation of the first and second pipes of this utility model;

[0017] Figure 3 For the present utility model Figure 2 Enlarged view of the structure at point A;

[0018] Figure 4 This is a schematic diagram showing the structural separation of the carriage and handle of this utility model;

[0019] Figure 5 For the present utility model Figure 4 Enlarged view of the structure at point -B;

[0020] In the diagram: 1. First pipe; 2. Second pipe; 3. Mounting rod; 4. First adjusting rod; 5. Second adjusting rod; 6. Mounting base; 7. Inner layer pipe; 8. Middle layer pipe; 9. Outer layer pipe; 10. First retaining ring; 11. Second retaining ring; 12. Sealing rubber ring; 13. Screw; 14. Keyway; 15. Screw tube; 16. Key block; 17. Mounting ring; 18. Gear ring; 19. Clamping plate; 20. Handle; 21. First gear; 22. First torsion spring; 23. Slot; 24. Slide; 25. Slot; 26. Rack; 27. Second gear; 28. Rotating rod; 29. ​​Second torsion spring; 30. Slide rod; 31. Spring. Detailed Implementation

[0021] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention.

[0022] This utility model provides a technical solution: such as Figures 1-5As shown in this embodiment, a corrosion-resistant FEP pipe includes a first pipe 1 and a second pipe 2. Both the first pipe 1 and the second pipe 2 are provided with an inner pipe 7, a middle pipe 8, and an outer pipe 9. A first retaining ring 10 is fixedly installed at the connection between the first pipe 1 and the second pipe 2. Two sets of second retaining rings 11 are fixedly installed at the connection between the second pipe 2 and the first pipe 1. The first pipe 1 and the second pipe 2 are movably engaged by the first retaining rings 10 and 11. Sealing rubber rings 12 are fixedly installed on both the first retaining rings 10 and 11. An installation rod 3 is fixedly installed on the first pipe 1. A first adjusting rod 4 is slidably installed inside the installation rod 3. A second adjusting rod 5 is slidably installed inside the first adjusting rod 4. An installation seat 6 is fixedly installed at the end of the second adjusting rod 5 away from the installation rod 3. The installation seat 6 and... The second pipe 2 is slidably sleeved. The mounting base 6 is provided with multiple sets of annularly distributed clamping plates 19. The second pipe 2 is provided with a clamping groove 23. The multiple sets of clamping plates 19 are movably clamped to the second pipe 2 through the clamping groove 23. A screw 13 is rotatably installed in the mounting rod 3. The screw 13 passes through the first adjusting rod 4 and is threadedly connected to the first adjusting rod 4. A screw tube 15 is rotatably installed in the first adjusting rod 4. The screw tube 15 passes through the second adjusting rod 5 and is threadedly connected to the second adjusting rod 5. Two sets of symmetrically distributed keyways 14 are opened on the screw 13. Two sets of symmetrically distributed key blocks 16 are provided in the screw tube 15. The key blocks 16 and keyways 14 are correspondingly arranged. The screw tube 15 is slidably sleeved with the screw 13 through the key blocks 16 and keyways 14. The FEP pipe of the present invention adopts a three-layer composite structure with synergistic effect to achieve excellent mechanical properties and corrosion resistance. The inner tube 7, a pure FEP pipe, directly contacts the transported medium. Its completely inert nature allows it to withstand the erosion of strong acids, strong alkalis, and organic solvents. The middle tube 8 is made of FEP composite material uniformly doped with 5%-10% short-cut carbon fibers. While maintaining the pipe's flexibility, the three-dimensional network structure formed by the carbon fibers significantly enhances the pipe's compressive strength and ring stiffness, making it less prone to deformation under high-pressure conditions. The outer tube 9, made of FEP, contains nano-titanium dioxide and other UV-resistant agents that effectively absorb ultraviolet rays, preventing the pipe from aging and becoming brittle due to photo-oxidation when used outdoors. The three-layer structure is integrally formed through a co-extrusion process, with tight interlayer bonding and no interface defects, ensuring the overall stability of performance. The first retaining ring 10 and the second retaining ring 11 adopt an interference fit design, which, together with the elastic sealing rubber ring 12, forms multiple sealing barriers at the pipe connection. Even when the internal pressure fluctuates, it can maintain a reliable seal and prevent crevice corrosion caused by media leakage.

[0023] like Figures 2-5As shown, a mounting ring 17 is rotatably mounted inside the mounting base 6, and a gear ring 18 is sleeved on the mounting ring 17. Multiple sets of clamping plates 19 are rotatably connected to the mounting base 6 via handles 20. Multiple sets of handles 20 are distributed in a ring around the mounting ring 17, and a first gear 21 is sleeved on each of the multiple sets of handles 20. Four sets of symmetrically distributed slots 25 are opened on the upper handle 20, and the multiple sets of first gears 21 are meshed with the gear ring 18. A first torsion spring 22 is sleeved on each of the multiple sets of handles 20, and the two ends of the first torsion spring 22 are fixedly connected to the first gear 21 and the mounting base 6, respectively. Two sets of slides 24 are slidably mounted inside the mounting base 6. The two sets of slides 24 can be movably engaged with the handles 20 through the slots 25. A rack 26 is fixedly mounted on each of the two sets of slides 24. A second gear 27 is provided between the racks 26. The second gear 27 meshes with the two racks 26 respectively. The second gear 27 is rotatably connected to the mounting base 6 through the rotating rod 28. A second torsion spring 29 is sleeved on the rotating rod 28. The two ends of the second torsion spring 29 are fixedly connected to the second gear 27 and the mounting base 6 respectively. Two sets of slides 24 are centrally symmetrically distributed through the rotating rod 28. Two sets of slide rods 30 corresponding to the slides 24 are fixedly installed in the mounting base 6. The slides 24 and the corresponding slide rods 30 are slidably sleeved. Two sets of symmetrically distributed springs 31 are sleeved on the slide rods 30. The two ends of the two sets of springs 31 are fixedly connected to the corresponding slides 24 and the mounting base 6 respectively. The quick connection mechanism of the pipeline achieves reliable assembly through precision mechanical transmission. During installation, the handle 20 on the mounting base 6 is rotated to engage with the first gear 21 and the gear ring 18, causing multiple sets of clamping plates 19 to unfold synchronously. The upper handle 20 is then locked in position by fixing the slot 25 with two sets of slides 24. The drive motor drives the screw 13 to rotate. Since the keyway 14 on the screw 13 meshes with the key block 16 inside the screw tube 15, the screw tube 15 rotates synchronously and pushes the first adjusting rod 4 and the second adjusting rod 5 to move linearly, thus precisely controlling the displacement of the mounting base 6. When the mounting base 6 moves to the predetermined position, rotating the rotating rod 28 on the mounting base 6 causes the two sets of slides 24 to disengage from the slots 25 on the handle 20. Under the action of the first torsion spring 22 on the multiple sets of handles 20, the multiple sets of locking plates 19 rotate inward synchronously and engage with the corresponding slots 23 of the second pipe 2. Releasing the rotating rod 28 allows the two sets of slides 24 to slide inward synchronously under the action of the second torsion spring 29 and the spring 31, and engage with the slots 25. The handle 20 remains locked, achieving pipe alignment and fastening in a single operation. Its unique self-locking mechanism can better resist vibration and pressure fluctuations, improve connection strength, and completely avoid sealing failure caused by welding heat-affected zone or adhesive aging.

[0024] This invention provides an FEP pipe with good corrosion resistance. The specific working principle is as follows: The FEP pipe of this invention adopts a three-layer composite structure with synergistic effect to achieve excellent mechanical properties and corrosion resistance. The inner tube 7, a pure FEP pipe, directly contacts the transported medium. Its completely inert nature allows it to withstand the erosion of strong acids, strong alkalis, and organic solvents. The middle tube 8 is made of FEP composite material uniformly doped with 5%-10% short-cut carbon fibers. While maintaining the pipe's flexibility, the three-dimensional network structure formed by the carbon fibers significantly enhances the pipe's compressive strength and ring stiffness, making it less prone to deformation under high-pressure conditions. The outer tube 9, made of FEP, contains nano-titanium dioxide and other UV-resistant agents that effectively absorb ultraviolet rays, preventing aging and embrittlement caused by photo-oxidation when the pipe is used outdoors. The three-layer structure is integrally formed through a co-extrusion process, with tight interlayer bonding and no interface defects, ensuring the stability of overall performance. The first retaining ring 10 and the second retaining ring 11 adopt an interference fit design, which, together with the elastic sealing rubber ring 12, forms multiple sealing barriers at the pipe connection. Even when the internal pressure fluctuates, it can maintain a reliable seal and prevent crevice corrosion caused by media leakage. The quick connection mechanism of the pipe achieves reliable assembly through precision mechanical transmission. During installation, the handle 20 on the mounting base 6 is rotated to engage with the first gear 21 and the gear ring 18, causing multiple sets of clamping plates 19 to unfold synchronously. The upper handle 20 is then locked in position by fixing the slot 25 with two sets of slides 24. The drive motor drives the screw 13 to rotate. Since the keyway 14 on the screw 13 meshes with the key block 16 inside the screw tube 15, the screw tube 15 rotates synchronously and pushes the first adjusting rod 4 and the second adjusting rod 5 to move linearly, thus precisely controlling the displacement of the mounting base 6. When the mounting base 6 moves to the predetermined position, rotating the rotating rod 28 on the mounting base 6 causes the two sets of slides 24 to disengage from the slots 25 on the handle 20. Under the action of the first torsion spring 22 on the multiple sets of handles 20, the multiple sets of locking plates 19 rotate inward synchronously and engage with the corresponding slots 23 of the second pipe 2. Releasing the rotating rod 28 allows the two sets of slides 24 to slide inward synchronously under the action of the second torsion spring 29 and the spring 31, and engage with the slots 25. The handle 20 remains locked, achieving pipe alignment and fastening in a single operation. Its unique self-locking mechanism can better resist vibration and pressure fluctuations, improve connection strength, and completely avoid sealing failure caused by welding heat-affected zone or adhesive aging.

[0025] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A corrosion-resistant FEP pipe, comprising a first pipe (1) and a second pipe (2), characterized in that: Both the first pipe (1) and the second pipe (2) are equipped with an inner pipe (7), a middle pipe (8), and an outer pipe (9). A first retaining ring (10) is fixedly installed at the connection between the first pipe (1) and the second pipe (2). Two sets of second retaining rings (11) are fixedly installed at the connection between the second pipe (2) and the first pipe (1). The first pipe (1) and the second pipe (2) are movably connected by the first retaining ring (10) and the second retaining ring (11). A sealing rubber ring (12) is fixedly installed on both the first retaining ring (10) and the second retaining ring (11). An installation rod (3) is fixedly installed on the channel (1). A first adjusting rod (4) is slidably installed inside the installation rod (3). A second adjusting rod (5) is slidably installed inside the first adjusting rod (4). An installation seat (6) is fixedly installed at the end of the second adjusting rod (5) away from the installation rod (3). The installation seat (6) is slidably connected to the second pipe (2). The installation seat (6) is provided with multiple sets of ring-shaped clamping plates (19). The second pipe (2) is provided with a clamping groove (23). The multiple sets of clamping plates (19) are movably clamped to the second pipe (2) through the clamping groove (23).

2. The FEP pipe with good corrosion resistance according to claim 1, characterized in that: A screw (13) is rotatably installed inside the mounting rod (3). The screw (13) passes through the first adjusting rod (4) and is threadedly connected to the first adjusting rod (4). A screw tube (15) is rotatably installed inside the first adjusting rod (4). The screw tube (15) passes through the second adjusting rod (5) and is threadedly connected to the second adjusting rod (5).

3. The FEP pipe with good corrosion resistance according to claim 2, characterized in that: The screw (13) has two sets of symmetrically distributed keyways (14), and the solenoid (15) has two sets of symmetrically distributed key blocks (16). The key blocks (16) and keyways (14) are arranged correspondingly, and the solenoid (15) is slidably connected to the screw (13) through the key blocks (16) and keyways (14).

4. The FEP pipe with good corrosion resistance according to claim 1, characterized in that: An mounting ring (17) is rotatably mounted inside the mounting base (6). A toothed ring (18) is sleeved on the mounting ring (17). Multiple sets of clamping plates (19) are rotatably connected to the mounting base (6) via handles (20). Multiple sets of handles (20) are distributed in a ring around the mounting ring (17). A first gear (21) is sleeved on each of the multiple sets of handles (20). Four sets of symmetrically distributed slots (25) are provided on the upper handle (20).

5. The FEP pipe with good corrosion resistance according to claim 4, characterized in that: Multiple sets of the first gears (21) are meshed with the gear ring (18), and multiple sets of the handles (20) are fitted with first torsion springs (22). The two ends of the first torsion springs (22) are fixedly connected to the first gears (21) and the mounting base (6), respectively.

6. The FEP pipe with good corrosion resistance according to claim 1, characterized in that: Two sets of slides (24) are slidably installed in the mounting base (6). The two sets of slides (24) can be movably engaged with the handle (20) through the slot (25). A rack (26) is fixedly installed on each set of slides (24). A second gear (27) is provided between the two sets of racks (26). The second gear (27) meshes with the two sets of racks (26) respectively. The second gear (27) is rotatably connected to the mounting base (6) through the rotating rod (28). A second torsion spring (29) is sleeved on the rotating rod (28). The two ends of the second torsion spring (29) are fixedly connected to the second gear (27) and the mounting base (6) respectively. The two sets of slides (24) are symmetrically distributed through the rotating rod (28). Two sets of slide rods (30) corresponding to the slides (24) are fixedly installed in the mounting base (6).

7. The FEP pipe with good corrosion resistance according to claim 6, characterized in that: The slide (24) is slidably connected to the corresponding slide rod (30). Two sets of symmetrically distributed springs (31) are sleeved on the slide rod (30). The two ends of the two sets of springs (31) are respectively fixedly connected to the corresponding slide (24) and the mounting base (6).

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