A spiral-wound liner connection for a klay pipe

Abstract

The application provides a spiral rib inner lining connecting piece of a clark pipe, relates to the technical field of pipelines and comprises a connecting pipe, the pipe opening of the connecting pipe and / or the clark pipe is provided with a matched outer wedge ring and inner wedge ring to form a wedge locking structure, an outer ring part is coaxially sleeved on the outside of the connecting pipe, a driving cavity is formed between the outer ring part and the connecting pipe, a movable push ring is arranged in the driving cavity, the inner wall of the outer ring part is provided with a communication channel communicated with the driving cavity and an annular gap, and an annular sealing capsule is embedded in the annular gap; when the clark pipe is connected by the wedge locking structure, the pipe opening of the clark pipe pushes the movable push ring to slide in the driving cavity, so that the fluid is pressed into the annular sealing capsule through the communication channel, the annular sealing capsule is expanded and sealed, and the gap among the outer ring part, the movable push ring and the pipe opening of the clark pipe is sealed; the application synchronously realizes sealing through the plugging action, significantly improves the connecting efficiency, sealing reliability and pull-out resistance, and is suitable for various buried and pressure-bearing pipeline works.

Description

Technical Field

[0001] This invention relates to the field of pipeline technology, and in particular to a spiral ribbed lining connector for a kraft pipe. Background Technology

[0002] Krah pipes (high-density polyethylene spiral wound structured wall pipes) are widely used in various pipeline projects due to their advantages such as light weight, corrosion resistance, high compressive strength, and long service life. However, the connection reliability of Krah pipes directly affects the operational stability of the pipeline system.

[0003] Currently, the main connection methods for Krah pipe sections include heat shrinkable tape connections, electrofusion tape connections, clamp-type mechanical connections, and flange connections. These traditional connection methods generally have some inherent drawbacks: for example, heat shrinkable or electrofusion connections require high levels of skill from the operating environment and personnel, making quality control difficult, and they are also challenging to install in confined or damp spaces; clamp and flange connections typically rely on a large number of bolts for tightening, resulting in cumbersome and inefficient installation steps, and the bolts are prone to corrosion in long-term buried environments, which may lead to a decrease in sealing preload and cause leakage at the joint. More importantly, in existing connection methods, the sealing (such as rubber rings) and the tightening of the pipe ends (such as clamps and flange compression) are often two relatively independent processes and structures. This not only increases the complexity and cost of the components but also makes the installation quality more dependent on the operational precision and consistency of the construction personnel, posing a risk of seal failure due to improper positioning of sealing elements or uneven tightening force. Summary of the Invention

[0004] Based on this, the purpose of the present invention is to provide a spiral rib lining connector for a kraft tube, which aims to solve at least one problem in the prior art.

[0005] This invention provides a spiral rib liner connector for a kraft tube, comprising: A connecting tube is used to seal and connect the openings of two sections of kraft tube to be connected, and the openings of the connecting tube and / or the kraft tube are provided with mutually cooperating outer wedge rings and inner wedge rings to form a wedge-shaped locking structure. An outer ring component is coaxially sleeved on the outside of the connecting pipe, and an annular driving chamber is formed between the outer ring component and the connecting pipe. An axially sliding movable push ring is provided in the driving chamber. The inner wall of the outer ring component is provided with a communication channel communicating with the driving chamber and an annular notch communicating with the communication channel, and an annular sealing bladder is embedded in the annular notch; When the two sections of the Krah tube are connected by the wedge-shaped locking structure, their openings push the movable push ring to slide in the drive chamber, so as to force the fluid in the drive chamber into the annular sealing bladder through the connecting channel, causing the annular sealing bladder to expand and seal the gap between the outer ring, the movable push ring and the Krah tube opening.

[0006] Furthermore, the connecting pipe is provided with the outer wedge ring at both ends, and the tube opening of the kraft tube is provided with the inner wedge ring. The outer wedge ring and the inner wedge ring are inserted and fitted to form the wedge-shaped locking structure, and the mating surfaces of the outer wedge ring and the inner wedge ring both include a first guide slope and a locking surface that cooperate with each other. During the insertion process, the first guide bevels fit together to achieve guidance and radial locking. After the insertion is completed, the locking surfaces fit together to achieve axial anti-disengagement.

[0007] Furthermore, the outer wedge ring and the inner wedge ring are evenly distributed in multiple sets along the circumference, and each set of wedge-shaped locking structures is independent of each other.

[0008] Furthermore, the outer periphery of the movable push ring is fitted with at least one sealing ring, which slides and seals with the inner wall of the drive chamber.

[0009] Furthermore, the annular notch is located on the inner wall of the outer ring near the opening of the kraft tube, and corresponds to the insertion depth of the kraft tube opening. The annular sealing bladder is completely contained within the annular notch when it is not inflated, and its outer surface is tightly fitted to the outer wall of the kraft tube opening and the movable push ring after expansion.

[0010] Furthermore, the outer ring is also fitted with a gripping mechanism, which includes a rotating ring fitted on the outer ring, a support member on the outer ring, and an arc-shaped gripper rotatably connected to the support member. The arc-shaped gripper has a wedge-shaped block at its end near the support member. When the rotating ring rotates circumferentially around the outer ring, the outer wall of the rotating ring abuts against the wedge block, driving the arc-shaped gripper to rotate around the support member, so that the end of the arc-shaped gripper away from the wedge block clamps the outer wall of the Krah tube, thereby assisting in locking the connecting pipe and the Krah tube.

[0011] Furthermore, multiple arc-shaped grippers are evenly distributed along the circumference of the outer ring member. Each arc-shaped gripper is provided with an independent support member and a wedge block. Multiple arc-shaped grippers simultaneously clamp the outer wall of the kraft tube to achieve a uniform circumferential auxiliary locking force.

[0012] Furthermore, the outer wall of the rotating ring is provided with a second guide slope that matches the inclined surface of the wedge block. When the rotating ring rotates, the second guide slope abuts against the inclined surface of the wedge block, converting the circumferential rotation of the rotating ring into the radial clamping action of the arc-shaped gripper.

[0013] Furthermore, multiple sets of the connecting channels are evenly distributed along the circumference of the outer ring component, and each set of connecting channels independently connects the driving chamber to the corresponding annular notch.

[0014] Furthermore, the drive chamber is pre-filled with a fluid medium, which is compressed air or hydraulic oil. The movable push ring is located at the end of the drive chamber in the initial state, corresponding to the end face of the kraft tube port.

[0015] Compared with the prior art, the beneficial effects of the present invention are as follows: 1. By setting up a wedge-shaped locking structure with mutually cooperating outer and inner wedge rings, during the insertion of the Krah tube, the first guide bevels fit together to achieve guidance and radial locking, and the locking surfaces fit together to achieve axial anti-dislodgement, ensuring the stability of the initial connection between the two Krah tube sections; at the same time, the insertion action directly drives the movable push ring to slide in the drive chamber, and the fluid medium is used to press into the annular sealing bladder through the connecting channel, causing it to expand and automatically fill the gap between the outer ring, the movable push ring and the Krah tube opening; this structure links the insertion operation and the sealing action, and can achieve the synchronous completion of connection and sealing without additional operation steps, which significantly improves construction efficiency, and relies on fluid pressure to adaptively compensate for the sealing gap, effectively avoiding the sealing failure problem caused by installation deviation or vibration.

[0016] 2. Based on the wedge-shaped locking structure and sealing expansion locking, a gripping mechanism is further set up. The circumferential rotation of the rotating ring drives the arc-shaped gripper to rotate around the support, so that the end of the arc-shaped gripper radially clamps the outer wall of the tube, providing auxiliary locking force. Together with the wedge-shaped locking structure, it forms a double axial and radial constraint, effectively dispersing the stress concentration at the connection part, and greatly improving the tensile and torsional resistance of the connector under complex load conditions. It is especially suitable for buried pipelines to withstand harsh working conditions such as soil displacement, water pressure fluctuation and temperature change. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the spiral rib lining connector of the kraft tube in an embodiment of the present invention; Figure 2 This is a cross-sectional view of the spiral rib liner connector of the kraft tube in an embodiment of the present invention. Figure 3 This is a schematic diagram of the structure of the connecting pipe, the port of the lamellar tube, and the outer ring in an embodiment of the present invention; Figure 4This is a schematic diagram of the pipe openings of the connecting pipe and the lamellar pipe in an embodiment of the present invention; Figure 5 for Figure 2 Enlarged view of point A in the middle; Figure 6 This is a schematic diagram of the gripping mechanism, outer ring, and tube opening of the prism tube in an embodiment of the present invention; Figure 7 for Figure 2 Enlarged view at point B in the middle; Component symbol explanation in the attached diagram: 1. Connecting pipe; 10. Inner wedge ring; 11. Locking surface; 12. First guide slope; 2. Corrugated tube; 20. Pipe end ring; 200. Outer wedge ring; 3. Outer ring component; 30. Drive chamber; 31. Movable push ring; 32. Sealing ring; 33. Connecting channel; 34. Collar; 35. Annular notch; 36. Annular sealing bladder; 37. External thread; 4. Gripping mechanism; 40. Rotating ring; 400. Second guide slope; 41. Internal thread; 42. Arc-shaped gripper; 420. Wedge block; 43. Support component; The following detailed description, in conjunction with the accompanying drawings, will further illustrate the present invention. Detailed Implementation

[0018] To facilitate understanding of the present invention, a more complete description will be given below with reference to the accompanying drawings. Several embodiments of the invention are illustrated in the drawings. However, the invention can be implemented in many different forms and is not limited to the embodiments described herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete.

[0019] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. The terminology used herein in the description of the invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0020] Please see Figures 1-7 The figure shown is a spiral rib liner connector for a kraft tube according to an embodiment of the present invention, comprising: The connecting pipe 1 is used to seal and connect with the openings 20 of the two sections of the kraft pipe 2 to be connected respectively. The openings 20 of the connecting pipe 1 and / or the kraft pipe 2 are provided with mutually cooperating outer wedge rings 200 and inner wedge rings 10 to form a wedge-shaped locking structure. The outer ring 3 is coaxially sleeved on the outside of the connecting pipe 1, and the outer ring 3 and the connecting pipe 1 form an annular driving chamber 30. The driving chamber 30 is provided with an axially sliding movable push ring 31. The inner wall of the outer ring 3 is provided with a communication channel 33 that communicates with the drive chamber 30 and an annular notch 35 that communicates with the communication channel 33. An annular sealing bladder 36 is embedded in the annular notch 35. When the two sections of the Krah tube 2 are connected by the wedge locking structure, the port 20 pushes the movable push ring 31 to slide in the drive chamber 30, so as to press the fluid in the drive chamber 30 into the annular sealing bladder 36 through the connecting channel 33, so that the annular sealing bladder 36 expands and seals the gap between the outer ring 3, the movable push ring 31 and the port 20 of the Krah tube 2.

[0021] The connecting pipe 1 has an outer wedge ring 200 integrally formed on the outer wall at both ends, and the kraft pipe 2 has an inner wedge ring 10 integrally formed on the inner wall of the pipe opening 20. The outer wedge ring 200 and the inner wedge ring 10 are inserted and fitted one-to-one to form a wedge-shaped locking structure. The mating surfaces of the outer wedge ring 200 and the inner wedge ring 10 both include a first guide slope 12 and a locking surface 11. The locking surface 11 is a vertical surface perpendicular to the pipe axis, and the first guide slope 12 is a slope inclined toward the end of the pipe opening 20. Preferably, the inclination angle is 30°-60°.

[0022] During the insertion process, the first guide bevels 12 fit together to achieve guidance and radial locking. After the insertion is completed, the locking surfaces 11 fit together to achieve axial anti-disengagement, restricting the relative axial displacement of the connecting pipe 1 and the kraft pipe 2, and fundamentally preventing the pipes from separating.

[0023] Furthermore, multiple sets of outer wedge rings 200 and inner wedge rings 10 are evenly distributed along the circumference, and each set of wedge-shaped locking structures is independent of each other.

[0024] In addition, at least one sealing ring 32 is provided on the outer periphery of the movable push ring 31. The sealing ring 32 slides and seals with the inner wall of the drive chamber 30. The sealing ring 32 and the inner wall of the drive chamber 30 form an interference fit to eliminate sliding gaps and ensure that when the movable push ring 31 slides, the fluid in the drive chamber 30 cannot leak from the movable push ring 31 and the drive chamber 30. All the fluid is pushed to the connecting channel 33 to block the fluid side leakage path.

[0025] An annular notch 35 is located on the inner wall of the outer ring 3 near the opening 20 of the kra tube 2, and corresponds to the insertion depth of the opening 20 of the kra tube 2. The annular sealing bladder 36 is completely contained within the annular notch 35 when it is not inflated. After expansion, its outer surface is tightly fitted with the outer wall of the opening 20 of the kra tube 2 and the movable push ring 31.

[0026] Furthermore, the outer ring 3 has a collar 34 at its end, and an annular notch 35 is located on the inner side of the end of the collar 34.

[0027] Understandably, the axial thrust of the collar 34 when the tube 20 of the Krah tube 2 is inserted drives the movable push ring 31 to slide and squeeze the fluid in the drive chamber 30, so that the fluid passes through the connecting channel 33 to the annular sealing bladder 36. After expansion, its outer surface is tightly fitted with the outer wall of the tube 20 of the Krah tube 2 and the movable push ring 31. No additional power source is required to realize the insertion drive-automatic sealing linkage. In addition, the sealing ring 32 ensures the sealing of the drive chamber 30, avoids fluid leakage, and ensures the stability of the expansion pressure of the annular sealing bladder 36.

[0028] Preferably, multiple sets of connecting channels 33 are evenly distributed along the circumference of the outer ring 3, and each set of connecting channels 33 independently connects the drive chamber 30 and the corresponding annular notch 35; the drive chamber 30 is pre-filled with a fluid medium, which is compressed air or hydraulic oil, and the movable push ring 31 is located at the end of the drive chamber 30 in the initial state, corresponding to the end face position of the port 20 of the kra tube 2.

[0029] In addition, a gripping mechanism 4 is also sleeved on the outer ring 3. The gripping mechanism 4 includes a rotating ring 40 sleeved on the outer ring 3, a support member 43 on the outer ring 3, and an arc-shaped gripper 42 rotatably connected to the support member 43. The arc-shaped gripper 42 has a wedge block 420 at the end near the support member 43. When the rotating ring 40 rotates around the outer ring 3, the outer wall of the rotating ring 40 abuts against the wedge block 420, driving the arc-shaped gripper 42 to rotate around the support 43, so that the end of the arc-shaped gripper 42 away from the wedge block 420 clamps the outer wall of the Krah tube 2 to help lock the connecting pipe 1 and the Krah tube 2.

[0030] Furthermore, multiple arc-shaped grippers 42 are evenly distributed along the circumference of the outer ring 3. Each arc-shaped gripper 42 is provided with an independent support 43 and a wedge block 420. Multiple arc-shaped grippers 42 simultaneously clamp the outer wall of the kraft tube 2 to achieve a uniform circumferential auxiliary locking force.

[0031] Furthermore, the end of the arc-shaped gripper 42 may be provided with anti-slip teeth to increase friction and prevent the pipe from sliding axially or rotating circumferentially.

[0032] Furthermore, the outer wall of the rotating ring 40 is provided with a second guide slope 400 that matches the slope of the wedge block 420. When the rotating ring 40 rotates, the second guide slope 400 and the slope of the wedge block 420 abut against each other, converting the circumferential rotation of the rotating ring 40 into the radial clamping action of the arc-shaped gripper 42.

[0033] Furthermore, the inner wall of the rotating ring 40 is provided with an internal thread 41, and the outer wall of the outer ring 3 is provided with an external thread 37. The two are threaded together, so that the rotating ring 40 can move axially when rotating in the circumferential direction, thereby driving the subsequent arc-shaped gripper 42 to achieve auxiliary locking of the laria tube 2.

[0034] The specific work steps are as follows: Align the two sections of the tube 2 with the two ends of the connecting tube 1 respectively. During the insertion process, the outer wedge ring 200 and the first guide slope 12 of the inner wedge ring 10 fit together, and the radial locking force gradually increases until the end face of the tube opening 20 pushes against the movable push ring 31. After the insertion is completed, the outer wedge ring 200 and the locking surface 11 of the inner wedge ring 10 are completely fitted together to achieve axial anti-disengagement; As the tube 20 is continuously inserted, it pushes the movable push ring 31 to slide towards the middle of the drive chamber 30, squeezing the fluid in the chamber. The fluid is injected into the annular sealing bladder 36 through the connecting channel 33. The annular sealing bladder 36 expands and tightly fits the outer wall of the tube 20 and the end face of the movable push ring 31 to form a seal. Rotate the rotating ring 40 so that its second guide slope 400 pushes against the wedge block 420, driving the arc-shaped gripper 42 to rotate around the support member 43, clamping the outer wall of the tube 2, and completing the overall locking and sealing.

[0035] In the description of this specification, references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0036] The embodiments described above are merely illustrative of several implementations of the present invention, and while the descriptions are specific and detailed, they should not be construed as limiting the scope of the present invention. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of the present invention, and these modifications and improvements all fall within the scope of protection of the present invention. Therefore, the scope of protection of this patent should be determined by the appended claims.

Claims

1. A spiral rib lining connector for a carbide tube, characterized in that, include: A connecting tube is used to seal and connect the openings of two sections of kraft tube to be connected, and the openings of the connecting tube and / or the kraft tube are provided with mutually cooperating outer wedge rings and inner wedge rings to form a wedge-shaped locking structure. An outer ring is coaxially sleeved on the outside of the connecting pipe, and a driving chamber is formed between the outer ring and the connecting pipe. A movable push ring with slidable connection is provided in the driving chamber. The inner wall of the outer ring component is provided with a communication channel communicating with the driving chamber and an annular notch communicating with the communication channel, and an annular sealing bladder is embedded in the annular notch; When the two sections of the Krah tube are connected by the wedge-shaped locking structure, their openings push the movable push ring to slide in the drive chamber, so as to force the fluid in the drive chamber into the annular sealing bladder through the connecting channel, causing the annular sealing bladder to expand and seal the gap between the outer ring, the movable push ring and the Krah tube opening.

2. The spiral rib liner connector for a carbide tube according to claim 1, characterized in that, The connecting pipe is provided with an outer wedge ring at both ends, and the tube opening of the kraft tube is provided with an inner wedge ring. The outer wedge ring and the inner wedge ring are inserted and fitted to form the wedge-shaped locking structure. The mating surfaces of the outer wedge ring and the inner wedge ring both include a first guide slope and a locking surface that cooperate with each other. During the insertion process, the first guide bevels fit together to achieve guidance and radial locking. After the insertion is completed, the locking surfaces fit together to achieve axial anti-disengagement.

3. The spiral rib liner connector for a carbide tube according to claim 1, characterized in that, The outer wedge ring and the inner wedge ring are evenly distributed in multiple sets along the circumference, and each set of wedge-shaped locking structures is independent of each other.

4. The spiral rib liner connector for a carbide tube according to claim 1, characterized in that, The outer circumference of the movable push ring is fitted with at least one sealing ring, which slides and seals with the inner wall of the drive chamber.

5. The spiral rib liner connector for a carat tube according to claim 1, characterized in that, The annular notch is located on the inner wall of the outer ring near the opening of the kraft tube and corresponds to the insertion depth of the kraft tube opening. The annular sealing bladder is completely contained within the annular notch when it is not inflated. After expansion, its outer surface is tightly fitted with the outer wall of the kraft tube opening and the movable push ring.

6. The spiral rib liner connector for a carbide tube according to claim 1, characterized in that, The outer ring is also fitted with a gripping mechanism, which includes a rotating ring fitted on the outer ring, a support member on the outer ring, and an arc-shaped gripper rotatably connected to the support member. The arc-shaped gripper has a wedge-shaped block at its end near the support member. When the rotating ring rotates circumferentially around the outer ring, the outer wall of the rotating ring abuts against the wedge block, driving the arc-shaped gripper to rotate around the support member, so that the end of the arc-shaped gripper away from the wedge block clamps the outer wall of the Krah tube, thereby assisting in locking the connecting pipe and the Krah tube.

7. The spiral rib liner connector for a carbide tube according to claim 6, characterized in that, Multiple arc-shaped grippers are evenly distributed along the circumference of the outer ring. Each arc-shaped gripper is provided with an independent support and a wedge block. Multiple arc-shaped grippers simultaneously clamp the outer wall of the kraft tube to achieve a uniform circumferential auxiliary locking force.

8. The spiral rib liner connector for a carbide tube according to claim 6, characterized in that, The outer wall of the rotating ring is provided with a second guide slope that matches the inclined surface of the wedge block. When the rotating ring rotates, the second guide slope abuts against the inclined surface of the wedge block, converting the circumferential rotation of the rotating ring into the radial clamping action of the arc-shaped gripper.

9. The spiral rib liner connector for a carbide tube according to claim 1, characterized in that, The connecting channels are evenly distributed in multiple sets along the circumference of the outer ring component, and each set of connecting channels independently connects the driving chamber to the corresponding annular notch.

10. The spiral rib liner connector for a carbide tube according to claim 1, characterized in that, The drive chamber is pre-filled with a fluid medium, which is compressed air or hydraulic oil. The movable push ring is located at the end of the drive chamber in the initial state, corresponding to the end face of the kraft tube port.

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