Pipeline connecting piece and connecting mode thereof

Abstract

The invention belongs to the technical field of pipeline connection, and particularly relates to a pipeline connecting piece and a connecting mode thereof. The pipeline connecting piece comprises a locking mechanism, an outer-layer sealing shell, two wedge-shaped sealing rings, an inner-layer adapting pipe and two O-shaped sealing rings. The outer-layer sealing shell and the inner-layer adapting pipe are both in a semi-opening shape. An upper groove and a lower groove are formed in the inner side of the inner-layer adapting pipe. The two O-shaped sealing rings are located in the upper groove and the lower groove respectively and used for being installed in a pipeline. A middle groove is formed in the inner side of the outer-layer sealing shell, and the two wedge-shaped sealing rings are used for being placed at the upper end and the lower end of the middle groove respectively. The inner-layer adapting pipe is used for being arranged in the middle groove and located between the two wedge-shaped sealing rings. And the locking mechanism is used for locking the inner-layer adapting pipe, the outer-layer sealing shell and the wedge-shaped sealing ring. Through the double-layer sealing design of the wedge-shaped sealing ring and the O-shaped sealing ring, the problem that a connecting joint of an existing pipeline connecting piece is prone to creep deformation and looseness under high pressure, and consequently sealing failure is caused is solved.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of pipeline connection, and particularly relates to a pipeline connecting piece and a connecting method thereof. BACKGROUND

[0002] The pipeline connection technology under the high-pressure seawater environment is a key supporting technology in the fields of deep-sea resource development, seabed observation network and marine energy utilization. With the development of marine development to the deep water area (>1000 meters), the pipeline system needs to withstand extreme environmental loads, including high pressure (10MPa-50MPa), low temperature (2℃-4℃), salt corrosion and dynamic ocean current impact. The traditional metal pipeline connection adopts flanges or mechanical clamps, but there are problems such as heavy weight, easy corrosion and short fatigue life; although the non-metal pipeline (such as PE, composite material) is good in corrosion resistance, the connecting joint thereof is prone to creep relaxation under high pressure, resulting in sealing failure. In particular, the stress corrosion cracking (SCC) and microbial corrosion (MIC) caused by seawater penetration can significantly reduce the reliability of the connecting structure. Therefore, it is urgent to develop high-sealing pressure-resistant connecting technology for pipelines. SUMMARY

[0003] Therefore, the application provides a pipeline connecting piece and a connecting method thereof, which solves the problem of sealing failure of the connecting joint of the existing pipeline connecting piece due to creep relaxation under high pressure through the double-layer sealing design of the wedge-shaped sealing ring and the O-shaped sealing ring.

[0004] The first aspect of the application provides a pipeline connecting piece, which comprises a locking mechanism, an outer sealing shell, two wedge-shaped sealing rings, an inner receiving pipe and two O-shaped sealing rings. The outer sealing shell and the inner receiving pipe are both in a half-open shape. The inner side of the inner receiving pipe is provided with an upper groove and a lower groove. The two O-shaped sealing rings are respectively located in the upper groove and the lower groove for accommodating the pipeline. The inner side of the outer sealing shell is provided with a middle groove, and the two wedge-shaped sealing rings are respectively placed at the upper end and the lower end of the middle groove. The inner receiving pipe is placed in the middle groove and located between the two wedge-shaped sealing rings. The locking mechanism is used to lock the inner receiving pipe, the outer sealing shell and the wedge-shaped sealing rings.

[0005] In one specific embodiment of the application, the pipeline connecting piece further comprises a nuclear-grade sealing lubricant. The nuclear-grade sealing lubricant is used to be applied between the O-shaped sealing ring, the inner receiving pipe, the outer sealing shell and the wedge-shaped sealing ring.

[0006] In one specific embodiment of the application, the pipeline connecting piece further comprises an adhesive. The adhesive is used to be filled between the inner receiving pipe and the pipeline.

[0007] In one specific embodiment of the application, the inner receiving pipe is of an integrated structure, and the outer protective shell is of a two-part structure, which are connected by welding.

[0008] In one embodiment of the present application, the locking mechanism comprises a clamping ring. The clamping ring is used to clamp the inner layer receiving pipe, the outer layer sealing shell and the wedge-shaped sealing ring.

[0009] In one embodiment of the present application, the locking mechanism further comprises a type II hexagonal stud nut. The type II hexagonal stud nut is used to clamp the clamping ring.

[0010] In one embodiment of the present application, the material of the wedge-shaped sealing ring is polytetrafluoroethylene.

[0011] In one embodiment of the present application, the material of the O-shaped sealing ring is perfluoroether rubber.

[0012] In one embodiment of the present application, the materials of the inner layer receiving pipe and the outer layer sealing shell are nickel-plated tungsten alloy.

[0013] In one embodiment of the present application, the pipeline is a high-density polyethylene pipeline.

[0014] The second aspect of the present application provides a connection method of a pipeline connector, which comprises the following steps.

[0015] Step one, install two O-shaped sealing rings into the upper groove and the lower groove of the inner layer receiving pipe respectively;

[0016] Step two, slowly rotate the pipeline into the inner layer receiving pipe;

[0017] Step three, combine the inner layer receiving pipe, the outer layer sealing shell and the wedge-shaped sealing ring;

[0018] Step four, perform seam welding on the inner layer receiving pipe and the outer layer sealing shell, and after the welding of the two divided outer layer sealing shells and the inner layer receiving pipe is completed, perform seam welding on the outer layer sealing shell;

[0019] Step five, locking treatment by the locking mechanism.

[0020] The beneficial effects of the technical solution of the present application are that: by using the inner layer receiving pipe installed with two O-shaped sealing rings to load the pipeline, and using the locking mechanism to lock the inner layer receiving pipe, the outer layer sealing shell and the wedge-shaped sealing ring, the O-shaped sealing ring can provide good sealing performance under medium and low pressure, the wedge-shaped sealing ring has excellent extrusion resistance and self-tightening performance, the self-tightening performance of the wedge-shaped sealing ring can exhibit better sealing performance under high pressure underwater, the wedge-shaped sealing ring and the O-shaped sealing ring complement each other to form excellent high sealing performance, and thus the double-layer sealing design of the wedge-shaped sealing ring and the O-shaped sealing ring ensures the overall sealing pressure resistance of the pipeline connector, effectively improving the reliability of the pipeline connector. BRIEF DESCRIPTION OF DRAWINGS

[0021] Figure 1 Fig. 3 shows a partial perspective view of a pipe connecting piece according to an embodiment of the present application.

[0022] Figure 2 Fig. 3 shows a partial perspective view of a pipe connecting piece according to an embodiment of the present application.

[0023] Figure 3 Fig. 4 shows an internal structure of the pipe connecting piece according to an embodiment of the present application.

[0024] Figure 4 Fig. 5 shows an internal structure of the pipe connecting piece according to an embodiment of the present application.

[0025] Figure 5 Fig. 5 shows an internal structure of the pipe connecting piece according to an embodiment of the present application.

[0026] Figure 6 Fig. 6 shows an internal structure of the pipe connecting piece according to an embodiment of the present application.

[0027] Figure 7 Fig. 7 shows a structure of the pipe connecting piece according to an embodiment of the present application.

[0028] Figure 8 Fig. 8 shows a structure of the pipe connecting piece according to an embodiment of the present application. DETAILED DESCRIPTION

[0029] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative work fall within the scope of protection of the present application.

[0030] At least one embodiment of the present application provides a pipe connecting piece which can be applied to non-metal pipes such as high-density polyethylene (HDPE) pipes. Figures 1 to 8The pipeline connecting piece comprises a locking mechanism, an outer sealing shell 3, two wedge-shaped sealing rings 4, an inner receiving pipe 5 and two O-shaped sealing rings 6. The outer sealing shell 3 and the inner receiving pipe 5 are both half-opened. The inner receiving pipe 5 is internally provided with an upper groove and a lower groove. The two O-shaped sealing rings 6 are respectively arranged in the upper groove and the lower groove for receiving the pipeline. The inner side of the outer sealing shell 3 is provided with a middle groove, and the two wedge-shaped sealing rings 4 are respectively arranged at the upper end and the lower end of the middle groove. The inner receiving pipe 5 is arranged in the middle groove and between the two wedge-shaped sealing rings 4. The locking mechanism is used for locking the inner receiving pipe 5, the outer sealing shell 3 and the wedge-shaped sealing rings 4.

[0031] For example, the assembly sequence of the pipeline connecting piece is as follows: from inside to outside, first, the two O-shaped sealing rings 6 are respectively arranged in the upper groove and the lower groove of the inner receiving pipe 5, then the PE pipeline is slowly rotated into the inner receiving pipe 5, the inner receiving pipe 5, the outer sealing shell 3 and the wedge-shaped sealing rings 4 are combined, the inner receiving pipe 5 and the outer sealing shell 3 are welded along the seam, after the welding of the two divided outer sealing shells 3 and the inner receiving pipe 5 is completed, the outer sealing shell 3 is welded along the seam, and finally, the locking mechanism is locked.

[0032] In the embodiment, the pipeline is received by the inner receiving pipe 5 provided with the two O-shaped sealing rings 6, and the inner receiving pipe 5, the outer sealing shell 3 and the wedge-shaped sealing rings 4 are locked by the locking mechanism. The O-shaped sealing ring 6 can provide good sealing performance under medium and low pressure, the wedge-shaped sealing ring 4 has excellent extrusion resistance and self-tightening performance, the self-tightening performance of the wedge-shaped sealing ring 4 can exhibit better sealing performance under high pressure, the wedge-shaped sealing ring 4 and the O-shaped sealing ring 6 complement each other to form excellent high sealing performance, and thus the double-layer sealing design of the wedge-shaped sealing ring 4 and the O-shaped sealing ring 6 ensures the sealing pressure resistance of the whole pipeline connecting piece and effectively improves the reliability of the pipeline connecting piece.

[0033] In at least one embodiment of the present application, the pipeline connecting piece further comprises a nuclear-grade sealing lubricant. The nuclear-grade sealing lubricant is used for being applied between the O-shaped sealing ring 6, the inner receiving pipe 5, the outer sealing shell 3 and the wedge-shaped sealing ring 4.

[0034] For example, the inner receiving pipe and the outer sealing shell are made of nickel-plated tungsten alloy, which has excellent radiation resistance, high temperature resistance, corrosion resistance and high strength, and can better adapt to extreme environments.

[0035] For example, when the inner layer receiving pipe 5 and the outer layer sealing shell 3 are welded along the seam (welding along the seam does not affect subsequent filling of a small amount of high-performance sealing lubricant), a nuclear-grade sealing lubricant can be filled between the two, further improving the anti-leakage sealing performance of the pipe fitting. The inner layer receiving pipe 5 and the O-shaped sealing ring 6 are filled with a nuclear-grade sealing lubricant. The nuclear-grade sealing lubricant can use EHC-PLUS series of U.S. Xurida Chemical or NG-165 of NEVER-SEEZ, etc.

[0036] In at least one embodiment of the present application, the pipe fitting further comprises an adhesive. The adhesive is used to fill between the inner layer receiving pipe 5 and the pipe.

[0037] For example, the adhesive uses ORAPI of France, Loctite or SAMARO, etc.

[0038] In at least one embodiment of the present application, the inner layer receiving pipe 5 is a one-piece structure, and the outer layer protective shell 3 is a two-piece structure, which facilitates the realization of a double-sealing structure. The two halves of the outer layer protective shell 3 are connected to the inner layer receiving pipe by welding along the seam, and the two-piece outer layer protective shell 3 is welded along the seam.

[0039] The locking mechanism only needs to be able to combine the inner layer receiving pipe 5, the outer layer sealing shell 3 and the wedge-shaped sealing ring 4. On this basis, the combination mode of the locking mechanism is not limited in the embodiments of the present application. For example, in at least one embodiment of the present application, the locking mechanism comprises a clamping ring 1. The clamping ring 1 is used to clamp the inner layer receiving pipe 5, the outer layer sealing shell 3 and the wedge-shaped sealing ring 4.

[0040] The clamping ring 1 can be clamped in the form of a buckle or a nut, etc. The embodiments of the present application do not make specific limitations thereon. For example, in some embodiments, the locking mechanism further comprises a type II hexagonal stud nut 2. The type II hexagonal stud nut 2 is used to clamp the clamping ring 1. In this way, since the type II hexagonal stud nut 2 has the advantages of convenient installation, high bearing capacity, strong adjustability, convenient maintenance, strong adaptability and high economy, etc., the locking operation is more simple and convenient.

[0041] It should be noted that after the inner layer receiving pipe 5, the outer layer sealing shell 3 and the wedge-shaped sealing ring 4 are locked by the clamping ring 1 and the type II hexagonal stud nut 2, welding treatment can be further performed.

[0042] In at least one embodiment of the present application, the material of the O-shaped sealing ring 6 is perfluoroether rubber; and / or, the material of the wedge-shaped sealing ring 4 is polytetrafluoroethylene. In this way, the design of double sealing and high-strength material further ensure the overall sealing pressure resistance of the pipe fitting.

[0043] The pipe connecting method comprises the following steps.

[0044] Step one, install two O-shaped sealing rings into the upper groove and the lower groove of the inner receiving pipe respectively;

[0045] Step two, slowly rotate the pipe into the inner receiving pipe;

[0046] Step three, combine the inner receiving pipe, the outer sealing shell and the wedge-shaped sealing ring;

[0047] Step four, perform the seam welding treatment on the inner receiving pipe and the outer sealing shell, and then perform the seam welding treatment on the outer sealing shell after the welding of the divided outer sealing shell and the inner receiving pipe is completed;

[0048] Step five, perform the locking treatment through the locking mechanism.

[0049] The pipe connecting method is the connecting method corresponding to the pipe connecting piece of the above-mentioned embodiment, comprises the corresponding technical features of the pipe connecting piece of the above-mentioned embodiment, and can realize the corresponding technical effects, which will not be described here.

[0050] It should be noted that the combination modes of the technical features in the embodiments of the present application are not limited to the combination modes described in the embodiments of the present application or the combination modes described in the specific embodiments, and all the technical features described in the present application can be freely combined or combined in any mode, unless contradictory.

[0051] As shown in the present application and the claims, unless the context clearly indicates otherwise, "one", "a", and / or "the" do not specifically refer to the singular, but can also include the plural. Generally, the term "comprising" only indicates that the steps and elements explicitly identified are included, and these steps and elements do not constitute an exclusive list, and the method or device can also include other steps or elements.

[0052] The above only describes the preferred embodiments of the present application and does not limit the present application. Any modification, equivalent replacement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A pipe connector, characterized in that: It includes a locking mechanism, an outer sealing shell, two wedge-shaped sealing rings, an inner receiving tube and two O-rings. Among them, the outer sealing shell and the inner receiving tube are both semi-open, and the inner side of the inner receiving tube is provided with an upper groove and a lower groove, and two O-rings are respectively located in the upper groove and the lower groove for installing the pipeline; the inner side of the outer sealing shell is provided with a middle groove, and two wedge-shaped sealing rings are respectively placed at the upper end and the lower end of the middle groove, and the inner receiving tube is used to be placed in the middle groove and located between the two wedge-shaped sealing rings, and the locking mechanism is used to lock the inner receiving tube, the outer sealing shell and the wedge-shaped sealing ring.

2. A pipe connector according to claim 1, characterized in that: It also includes a nuclear-grade sealing lubricant, wherein the nuclear-grade sealing lubricant is used to be applied between the O-ring, the inner receiving tube, the outer sealing shell and the wedge-shaped sealing ring.

3. A pipe connector according to claim 1, characterized in that: The invention also includes an adhesive, which is used for filling between the inner layer receiving pipe and the pipe.

4. A pipe connector according to claim 1, characterized in that: The inner receiving tube is an integrated structure, and the outer protective shell is a two-part structure, which are connected by welding.

5. A pipe connector according to claim 1, characterized in that: The locking mechanism comprises a clamping ring, which is used to clamp the inner receiving tube, the outer sealing shell and the wedge-shaped sealing ring.

6. A pipe connector according to claim 5, characterized in that: The locking mechanism further comprises a Type II hexagonal stud nut, which is used for clamping the clamping ring.

7. A pipe connector according to any one of claims 1 to 6, characterized in that: The wedge-shaped sealing ring is made of polytetrafluoroethylene; and / or the O-shaped sealing ring is made of perfluoroether rubber.

8. A pipe connector according to any one of claims 1 to 6, characterized in that: The inner receiving tube and the outer sealing shell are made of nickel-plated tungsten alloy.

9. The pipe connector according to claim 1, characterized in that: The pipes are high-density polyethylene pipes.

10. A connection method for a pipe connector, characterized in that: include: Step 1: Install the two O-rings into the upper and lower grooves of the inner tube respectively; Step 2: Slowly screw the pipe into the inner pipe; Step 3: Assemble the inner receiving tube, the outer sealing shell and the wedge-shaped sealing ring; Step 4: weld the inner layer receiving tube and the outer layer sealing shell along the seam. After the two outer layer sealing shells are welded to the inner layer receiving tube, weld the outer layer sealing shell along the seam. Step 5: Lock the device through the locking mechanism.

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