Chemical oil and gas pipeline high-pressure composite connection assembly

Abstract

The utility model relates to a kind of high-pressure composite connecting assembly of chemical oil gas pipeline, the high-pressure composite connecting assembly of chemical oil gas pipeline includes composite pipe, connecting mandrel, connecting sleeve and tightening structure, the connecting mandrel includes first connecting section, boss and second connecting section, the first connecting section is inserted into the composite pipe, the tightening structure is set on the composite pipe located outside first connecting section, the second connecting section and the connecting sleeve are connected by thread, first sealing mechanism and second sealing mechanism are further provided between the first connecting section and the composite pipe, first sealing mechanism and second sealing mechanism are sequentially in boss end direction, with the advantages that good sealing, anticorrosive effect is good.

Description

Technical Field

[0001] This utility model relates to the field of composite pipe connection technology, and in particular to a high-pressure composite connection component for chemical oil and gas pipelines. Background Technology

[0002] In the field of chemical and oil and gas transportation, composite pipelines are widely used due to their advantages such as corrosion resistance and high strength-to-weight ratio. However, traditional connection technologies have several prominent problems: insufficient sealing performance easily leads to leakage; weak tensile strength makes it difficult to withstand high-pressure conditions; poor vibration resistance makes them prone to loosening; and insufficient chemical corrosion resistance affects their service life.

[0003] Therefore, a high-pressure composite connection component for chemical oil and gas pipelines is provided to solve the above problems. Utility Model Content

[0004] In view of the problems existing in the prior art, this utility model provides a high-pressure composite connection component for chemical oil and gas pipelines with a reasonable structural design.

[0005] This utility model provides a high-pressure-bearing composite connection assembly for chemical oil and gas pipelines, the high-pressure-bearing composite connection assembly for chemical oil and gas pipelines comprising: The composite tube, connecting mandrel, connecting sleeve, and tightening structure are provided. The connecting mandrel includes a first connecting section, a boss, and a second connecting section. The first connecting section is inserted into the composite tube. The tightening structure is sleeved on the composite tube located outside the first connecting section. The second connecting section and the connecting sleeve are connected by threads. A first sealing mechanism and a second sealing mechanism are also provided between the first connecting section and the composite tube, with the first sealing mechanism and the second sealing mechanism arranged sequentially from the end of the boss.

[0006] Optionally, an outer conical surface structure is provided on the outer wall of the end of the first connecting segment away from the boss, and the taper of the outer conical surface structure is 1:5.

[0007] Optionally, a first sealing mounting groove is provided on the first connecting segment in conjunction with the first sealing mechanism, and a second sealing mounting groove is provided on the first connecting segment in conjunction with the second sealing mechanism.

[0008] Optionally, the first sealing mechanism is a hydrogenated nitrile rubber sealing ring, which is used to achieve static sealing, and the second sealing mechanism includes a V-shaped spring skeleton covered with polytetrafluoroethylene.

[0009] Optionally, the tightening structure includes tightening plates and tightening rings. A plurality of tightening plates are evenly and fixedly disposed on the base, and the plurality of tightening plates form a ring. The base is sleeved on the composite tube, and the tightening ring is disposed on the outside of the tightening plates.

[0010] Optionally, the tightening plate has a first thread on the side wall away from the composite tube, the tightening ring has a second thread that mates with the first thread on its inner wall, and the tightening plate has anti-slip teeth on the side wall near the composite tube.

[0011] Optionally, a third thread is provided on the outer wall of the second connecting section, and a fourth thread is provided on the inner wall of the connecting sleeve to cooperate with the third thread.

[0012] Optionally, a third sealing mechanism is provided between the contact surface of the connecting sleeve and the boss, a connecting platform is provided in the middle of the inner wall of the connecting sleeve, and a fourth sealing mechanism is provided on both sides of the connecting platform. Both the third sealing mechanism and the fourth sealing mechanism are rubber sealing rings.

[0013] This utility model features a triple sealing system, including a first sealing structure, a second sealing structure, and an outer conical surface structure, which ensures the reliability of the seal under high-pressure conditions. The use of modular components significantly reduces the difficulty and time cost of on-site installation. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the overall structure of this utility model.

[0015] Figure 2 This is a schematic diagram of the structure of the second sealing mechanism of this utility model.

[0016] Figure 3 This is a schematic diagram of the structure of the tightening piece of this utility model. Detailed Implementation

[0017] This utility model provides a high-pressure composite connection assembly for chemical oil and gas pipelines, comprising: a composite pipe, a connecting mandrel, a connecting sleeve, and a tightening structure. The connecting mandrel includes a first connecting section, a boss, and a second connecting section. The first connecting section is inserted into the composite pipe. The tightening structure is sleeved on the composite pipe located outside the first connecting section. The second connecting section and the connecting sleeve are connected by threads. A first sealing mechanism and a second sealing mechanism are also provided between the first connecting section and the composite pipe, arranged sequentially from the end of the boss. In the prior art, existing pipeline connectors suffer from problems such as insufficient sealing performance leading to leakage; weak tensile strength making it difficult to withstand high-pressure conditions; poor vibration resistance leading to loosening; and insufficient chemical corrosion resistance affecting service life.

[0018] The terms "first," "second," "third," "fourth," etc. (if present) in the specification, claims, and accompanying drawings of this utility model are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate so that the embodiments described herein can be implemented in orders other than those illustrated or described herein. Furthermore, the terms "comprising" or "having" and any variations thereof are intended to cover a non-exclusive inclusion; for example, a process, method, system, product, or apparatus that comprises a series of steps or units is not necessarily limited to those steps or units explicitly listed, but may include other steps or units not explicitly listed or inherent to such processes, methods, products, or apparatus.

[0019] Example 1 Reference manual attached Figure 1-3 This embodiment provides a high-pressure composite connection assembly for chemical and oil / gas pipelines. The high-pressure composite connection assembly for chemical and paint pipelines includes: The composite tube 1, connecting mandrel, connecting sleeve 7, and tightening structure are provided. The connecting mandrel includes a first connecting section, a boss 5, and a second connecting section. The first connecting section is inserted into the composite tube 1. The tightening structure is sleeved on the composite tube 1 located outside the first connecting section. The second connecting section and the connecting sleeve 7 are connected by threads. A first sealing mechanism 4 and a second sealing mechanism 3 are also provided between the first connecting section and the composite tube 1. The first sealing mechanism 4 and the second sealing mechanism 3 are arranged sequentially from the end of the boss 5.

[0020] An outer conical structure 2 is provided on the outer wall of the end of the first connecting section away from the boss 5, and the taper of the outer conical structure 2 is 1:5.

[0021] The first connecting section has a first sealing mounting groove that cooperates with the first sealing mechanism 4, and the first connecting section has a second sealing mounting groove that cooperates with the second sealing mechanism 3.

[0022] The first sealing mechanism 4 is a hydrogenated nitrile rubber sealing ring, which is used to achieve static sealing. The second sealing mechanism 3 includes a V-shaped spring skeleton, which is covered with polytetrafluoroethylene.

[0023] The tightening structure includes tightening plates 8 and tightening rings 9. Several tightening plates 8 are evenly and fixedly arranged on the base, and the several tightening plates 8 form a ring. The base is sleeved on the composite tube 1, and the tightening rings 9 are arranged on the outside of the tightening plates 8.

[0024] The tightening plate 8 has a first thread on the side wall away from the composite tube 1, the tightening ring 9 has a second thread that mates with the first thread on the inner wall, and the tightening plate 8 has anti-slip teeth on the side wall near the composite tube 1.

[0025] The outer wall of the second connecting section is provided with a third thread, and the inner wall of the connecting sleeve 7 is provided with a fourth thread to match the third thread.

[0026] A third sealing mechanism 6 is provided between the contact surfaces of the connecting sleeve 7 and the boss 5. A connecting platform is provided in the middle of the inner wall of the connecting sleeve 7. A fourth sealing mechanism is provided on both sides of the connecting platform. Both the third sealing mechanism 6 and the fourth sealing mechanism are rubber sealing rings.

[0027] During installation, the end face of the composite pipe is manually processed to ensure a smooth surface and remove burrs. The tightening disc and tightening plate are then sequentially fitted onto the composite pipe. The first and second sealing mechanisms are installed in the mounting groove of the connecting mandrel. The connecting mandrel is then inserted into the end of the composite pipe. A specialized hydraulic tool is used to apply appropriate pressure, the specific value calculated based on the pipe diameter and wall thickness. The relatively soft inner lining of the composite pipe is forcibly squeezed, sheared, and plastically flowed by the outer conical structure of the connecting mandrel, completely embedding into the pipe lining. The pipe material fills all the gaps between the teeth, forming a mechanical interlocking structure. This constitutes the first line of defense in the connection, primarily responsible for transmitting pull-out force and torque. The tightening plate is then positioned directly opposite the first connecting section, and the tightening ring is screwed onto the tightening plate for tightening. Finally, the connecting sleeve is screwed onto the second connecting section, completing the assembly.

[0028] Example 2 Reference manual attached Figure 1-3 This embodiment provides a high-pressure composite connection assembly for chemical and oil / gas pipelines. The high-pressure composite connection assembly for chemical and paint pipelines includes: The composite tube 1, connecting mandrel, connecting sleeve 7, and tightening structure are provided. The connecting mandrel includes a first connecting section, a boss 5, and a second connecting section. The first connecting section is inserted into the composite tube 1. The tightening structure is sleeved on the composite tube 1 located outside the first connecting section. The second connecting section and the connecting sleeve 7 are connected by threads. A first sealing mechanism 4 and a second sealing mechanism 3 are also provided between the first connecting section and the composite tube 1. The first sealing mechanism 4 and the second sealing mechanism 3 are arranged sequentially from the end of the boss 5. The connecting mandrel is made of 316 stainless steel.

[0029] An outer conical structure 2 is provided on the outer wall of the end of the first connecting section away from the boss 5, and the taper of the outer conical structure 2 is 1:5.

[0030] The first connecting section has a first sealing mounting groove that cooperates with the first sealing mechanism 4, and the first connecting section has a second sealing mounting groove that cooperates with the second sealing mechanism 3.

[0031] The first sealing mechanism 4 is a hydrogenated nitrile rubber sealing ring, which is used to achieve static sealing. The second sealing mechanism 3 includes a V-shaped spring skeleton, which is covered with polytetrafluoroethylene.

[0032] The tightening structure includes tightening plates 8 and tightening rings 9. Several tightening plates 8 are evenly and fixedly arranged on the base, forming a ring. The base is sleeved on the composite tube 1, and the tightening rings 9 are located on the outer side of the tightening plates 8. The tightening plates are made of 304 stainless steel, and the tightening discs are made of forged 42CrMo steel.

[0033] The tightening plate 8 has a first thread on the side wall away from the composite tube 1, the tightening ring 9 has a second thread that mates with the first thread on the inner wall, and the tightening plate 8 has anti-slip teeth on the side wall near the composite tube 1.

[0034] The outer wall of the second connecting section is provided with a third thread, and the inner wall of the connecting sleeve 7 is provided with a fourth thread to match the third thread.

[0035] A third sealing mechanism 6 is provided between the contact surfaces of the connecting sleeve 7 and the boss 5. A connecting platform is provided in the middle of the inner wall of the connecting sleeve 7. A fourth sealing mechanism is provided on both sides of the connecting platform. Both the third sealing mechanism 6 and the fourth sealing mechanism are rubber sealing rings.

[0036] During installation, the end face of the composite pipe is manually processed to ensure a smooth surface and remove burrs. The tightening disc and tightening plate are then sequentially fitted onto the composite pipe. The first and second sealing mechanisms are installed in the mounting groove of the connecting mandrel. The connecting mandrel is then inserted into the end of the composite pipe. A specialized hydraulic tool is used to appropriately increase the pressure; the specific pressure value is calculated based on the pipe diameter and wall thickness. The relatively soft inner lining of the composite pipe is forcibly squeezed, sheared, and plastically flowed by the outer conical structure of the connecting mandrel, completely embedding into the pipe lining. The pipe material fills all the gaps between the teeth, forming a mechanical interlocking structure. This constitutes the first line of defense in the connection, primarily responsible for transmitting pull-out force and torque. The tightening plate is then positioned directly opposite the first connecting section, and the tightening ring is screwed onto the tightening plate for tightening. Finally, the connecting sleeve is screwed onto the second connecting section to complete the assembly. After the connection is completed, an epoxy coal tar coating is applied to the connection area, ensuring a uniform coating to the specified thickness to guarantee its anti-corrosion effect.

[0037] The above-described embodiments are only used to illustrate the technical solutions of this utility model, and are not intended to limit it. Although this utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this utility model.

Claims

1. A high-pressure composite connection component for chemical oil and gas pipelines, characterized in that, The device includes a composite tube, a connecting mandrel, a connecting sleeve, and a tightening structure. The connecting mandrel includes a first connecting section, a boss, and a second connecting section. The first connecting section is inserted into the composite tube. The tightening structure is sleeved on the composite tube located outside the first connecting section. The second connecting section and the connecting sleeve are connected by threads. A first sealing mechanism and a second sealing mechanism are also provided between the first connecting section and the composite tube, with the first sealing mechanism and the second sealing mechanism arranged sequentially from the end of the boss.

2. The high-pressure composite connection assembly for chemical oil and gas pipelines according to claim 1, characterized in that, The outer wall of the end of the first connecting segment away from the boss is provided with an outer conical surface structure, and the taper of the outer conical surface structure is 1:

5.

3. The high-pressure composite connection assembly for chemical oil and gas pipelines according to claim 2, characterized in that, The first connecting segment has a first sealing mounting groove that cooperates with the first sealing mechanism, and the first connecting segment has a second sealing mounting groove that cooperates with the second sealing mechanism.

4. The high-pressure composite connection assembly for chemical oil and gas pipelines according to claim 3, characterized in that, The first sealing mechanism is a hydrogenated nitrile rubber sealing ring, which is used to achieve static sealing. The second sealing mechanism includes a V-shaped spring skeleton, which is covered with polytetrafluoroethylene.

5. The high-pressure composite connection assembly for chemical oil and gas pipelines according to claim 4, characterized in that, The tightening structure includes tightening plates and tightening rings. A plurality of tightening plates are evenly and fixedly arranged on the base, and the plurality of tightening plates form a ring. The base is sleeved on the composite tube, and the tightening ring is arranged on the outside of the tightening plates.

6. The high-pressure composite connection assembly for chemical oil and gas pipelines according to claim 5, characterized in that, The tightening plate has a first thread on the side wall away from the composite tube, the tightening ring has a second thread that mates with the first thread on its inner wall, and the tightening plate has anti-slip teeth on the side wall near the composite tube.

7. The high-pressure composite connection assembly for chemical oil and gas pipelines according to claim 6, characterized in that, The outer wall of the second connecting section is provided with a third thread, and the inner wall of the connecting sleeve is provided with a fourth thread to cooperate with the third thread.

8. The high-pressure composite connection assembly for chemical oil and gas pipelines according to claim 7, characterized in that, A third sealing mechanism is provided between the contact surface of the connecting sleeve and the boss. A connecting platform is provided in the middle of the inner wall of the connecting sleeve. A fourth sealing mechanism is provided on both sides of the connecting platform. Both the third sealing mechanism and the fourth sealing mechanism are rubber sealing rings.

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