CN217683739U

CN217683739U - Composite pipe connector

Info

Publication number: CN217683739U
Application number: CN202220596683.1U
Authority: CN
Inventors: 刘艳; 黄贤滨; 单广斌; 谢守明; 屈定荣
Original assignee: China Petroleum and Chemical Corp; Sinopec Safety Engineering Research Institute Co Ltd
Current assignee: China Petroleum and Chemical Corp; Sinopec Safety Engineering Research Institute Co Ltd
Priority date: 2022-03-18
Filing date: 2022-03-18
Publication date: 2022-10-28
Anticipated expiration: 2032-03-18

Abstract

The application discloses composite pipe connector, including wearing the cover at the inside inner socket of composite pipe, be equipped with toper pipe and external cover on the composite pipe outer wall in proper order, inner socket and outer festival cover pass through cutting ferrule fixed connection. The composite pipe connector has the advantages that the composite pipe connector can bear high-pressure complex load, the higher the pressure is, the higher the sealing specific pressure is, the high-pressure self-tightening effect is realized, and the sealing reliability is improved.

Description

Composite pipe connector

Technical Field

The invention belongs to nonmetal composite pipe connecting equipment, and particularly relates to a composite pipe connector.

Background

Composite pipes, sometimes also referred to as fibre reinforced composite pipes. These types of tubes are typically made from reinforcing fibers and an inner layer of an outer layer of polymeric material that is an inner layer of polymeric material. The composite pipe is flexible and can be coiled, the surface is smoother, the fluid friction is small, the composite pipe is particularly suitable for fluid conveying in oil-gas production, compared with the traditional metal pipe, the composite pipe is more convenient to install and maintain, and the composite pipe becomes an important pipe for oil-gas production.

In oil and gas production, composite pipes may be exposed to complex corrosive chemicals and harsh conditions, the pipeline loads caused by external pressure, internal pressure and tensile or compressive forces may be very high, and the composite pipes must be able to withstand these conditions. The pipeline connecting joint is used as a pipeline system terminal connecting device, is an important structure in a pipeline system, is also the link which is most prone to failure in the pipeline system, and is mainly used for connecting a pipeline and other devices, sealing a medium conveyed inside the pipeline, preventing the pipeline from being pulled out and the like. Reliable, convenient connections are the basis for successful application of all pipe systems, and the pipe joints have at least the same structural integrity as the rest of the pipe, subject primarily to axial tension, bending and twisting action from the pipe, and pressure from the inside and outside of the pipe. The load capacity that the pipe connector is subjected to should equal or exceed the full design load rating of the pipe. The connection method is particularly remarkable for the problem of the fiber reinforced composite pipe, because the fiber reinforced materials at the two pipe ends cannot be connected to form a force transmission structure when the composite pipe is connected, the working pressure of the composite pipe is relatively high, and the tightness of the joint is ensured to be difficult.

SUMMERY OF THE UTILITY MODEL

In view of the above problems, the present application provides a composite pipe connector with good sealing performance, which has the following technical scheme,

the composite pipe connector comprises an inner socket penetrating and sleeved inside a composite pipe, wherein a conical pipe and an outer socket are sequentially arranged on the outer wall of the composite pipe, and the inner socket and the outer socket are fixedly connected through a clamping sleeve.

Preferably, the inner sleeve section comprises a first cylindrical tube, the front end of the first cylindrical tube is connected with the inner connecting flange, the diameter of the rear end of the first cylindrical tube is not smaller than that of the front end of the first cylindrical tube, inverted sawtooth patterns are arranged on the outer wall of the first cylindrical tube, and sealing grooves are formed in the two ends of the first cylindrical tube, so that a sealing ring is arranged in each sealing groove; the inner connection flange comprises a clamping surface I and a conical surface I which are fixedly connected or are of an integrated structure, and the end parts of the composite pipe and the conical pipe are positioned in the clamping surface.

Preferably, the outer wall surface of the conical tube is a conical surface, the thicknesses of the conical surface are different along the axial direction, the thickness of the end closer to the clamping sleeve is larger, and the thickness of the end far away from the clamping sleeve is gradually reduced; the inner wall of the conical tube is provided with T-shaped patterns, and one end of the conical tube close to the clamping sleeve is provided with a discontinuous longitudinal multi-petal structure.

Further preferably, the inner diameter of the conical pipe is slightly smaller than the outer diameter of the composite pipe, the outer diameter of the conical pipe is slightly larger than the inner diameter of the outer socket, and the inner surface of the conical pipe, the outer surface of the composite pipe and the inner surface of the outer socket of the conical pipe form sealing surfaces respectively.

Preferably, the outer socket comprises a second cylindrical barrel, one end of the second cylindrical barrel is fixedly connected with the external flange, the external flange is provided with a second conical surface, and a T-shaped sealing ring is arranged between the first conical surface and the second conical surface.

More preferably, the material of the T-shaped sealing ring is cemented carbide.

Further preferably, the inner hub further comprises a longitudinal sealing plate disposed at one end of the composite tube.

Further preferably, the wall thickness t of the inner hub _sd The design is as follows:

wherein, P is the design pressure of the composite pipe, MPa; d _o Is the outer diameter of the composite pipe, mm; [ sigma ]]Allowable stress of the material used for the inner sleeve section at the design temperature is MPa; e _I Taking 1 as a welding joint coefficient without welding seams; y is the temperature correction coefficient of the material; c1 is the thickness reduction addition amount; c2 is corrosion or abrasion addition amount, mm; c3 is the depth of the insection (tooth height) and is mm.

Preferably, the inner sleeve is sleeved in the two composite pipes to be connected in a penetrating manner, a pair of symmetrical inner convex edges are arranged on the inner sleeve, each inner convex edge comprises a first clamping surface and a first conical surface, the first clamping surface and the first conical surface are fixedly connected or are of an integrated structure, the end parts of the composite pipes and the conical pipes are located in the first clamping surface, and the two pairs of inner convex edges are fixedly connected with the two outer sleeves through clamping sleeves respectively.

Further preferably, the composite pipe connector is installed as follows:

firstly, the outer sleeve section is sleeved on the composite pipe, then the conical pipe is arranged between the outer sleeve section and the composite pipe, then the T-shaped sealing ring is arranged, the sealing ring is sleeved on the inner sleeve section, the inner sleeve section is pressed into the composite pipe by proper pressure, the conical pipe and the outer sleeve section are adjusted by certain tension to be arranged at proper positions, the inner sleeve section, the outer sleeve section, the conical pipe and the composite pipe are tightly connected through inner expansion and outer pressure, and finally, the inner sleeve section and the outer sleeve section are fastened and clamped through two clamping sleeves.

Advantageous effects

1. The composite pipe connector disclosed by the invention is uniform in stress, and the phenomenon that the composite pipe structure is damaged due to stress concentration at the tail end of the connector is avoided.

2. The composite pipe connector can bear high-pressure complex load, the higher the pressure is, the higher the sealing specific pressure is, the high-pressure self-tightening effect is achieved, and the sealing reliability is improved.

3. Simple structure, the installation requires lowly, can relapse the dismouting, convenient to overhaul, and the dismouting process is simple, convenient, high-efficient, only need screw up the buckle bolt can.

Drawings

FIG. 1 is a cross-sectional view of the present application (without longitudinal seal plates);

FIG. 2 is a side view of the present application;

FIG. 3 is a cross-sectional view of the inner hub construction (with an internal flange);

FIG. 4 is a cross-sectional view of a tapered tube structure;

FIG. 5 is a side view of a tapered tube construction;

FIG. 6 is a schematic view of a T-seal ring configuration;

FIG. 7 is a schematic view of the outer hub structure;

FIG. 8 is a schematic view of a ferrule structure;

FIG. 9 is a cross-sectional view of the present application (including longitudinal seal plates);

figure 10 is a cross-sectional view of the inner hub being threaded over two composite pipes (with two internal lugs).

Detailed Description

The following detailed description is exemplary and is intended to provide further explanation of the invention as claimed. Unless defined otherwise, 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 application belongs. It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of example embodiments according to the present application.

Example 1 (when two composite pipes can be welded together)

As shown in fig. 1-7, the composite pipe connector comprises an inner sleeve 7 which is sleeved inside a composite pipe 6 in a penetrating manner, wherein a conical pipe 5 and an outer sleeve 4 are sequentially arranged on the outer wall of the composite pipe 6 from inside to outside, the inner sleeve 7 and the outer sleeve 4 are fixedly connected through a clamping sleeve 1, and the inner sleeve 7 and the outer sleeve 4 are tightly clamped and fastened through a bolt 2 and a nut 9.

The inner socket 7 is made of metal (copper and stainless steel are most commonly used), the inner socket 7 has a certain supporting function, and can keep a complete structure under the action of pressure, the inner socket comprises a first cylindrical barrel 70, the front end of the first cylindrical barrel 70 is connected with an inner connection flange 71, the diameter of the rear end of the first cylindrical barrel 70 is not smaller than that of the front end (slightly larger than that), inverted sawtooth patterns 74 are arranged on the outer wall of the first cylindrical barrel 70, and the first cylindrical barrel 70 and the composite pipe 6 are meshed to form a whole under the action of internal and external pressure. And sealing grooves 72 are formed in two ends of the first cylindrical barrel 70, sealing rings 8 are arranged in the sealing grooves, and the sealing rings 8 and the composite pipe 6 form a sealing surface to prevent fluid in a pipeline from leaking. The inner flange 71 includes a first engagement surface 710 and a first tapered surface 711, which are fixedly connected or are formed as an integral structure, and the ends of the composite pipe 6 and the tapered pipe 5 are located in the first engagement surface 710. The diameter that interior hub 7 is close to 1 one end of cutting ferrule slightly is less than the diameter (the surface is the toper face) of keeping away from cutting ferrule one end, becomes the horn structure, can slow down the change of runner, prevents that the fluid from producing violent torrent, reduces the washing away of pipeline.

The outer wall of the conical tube 5 is of a conical structure, the taper is 1-3 degrees, the thicknesses of the conical tube are different along the axial direction, the thickness of the end closer to the cutting sleeve 1 is larger, and the thickness of the end far away from the cutting sleeve 1 is gradually reduced; the inner wall of the conical tube is provided with a T-shaped pattern 51, and the end of the conical tube 1 close to the clamping sleeve is provided with a discontinuous longitudinal multi-lobe structure 52. The internal diameter of the conical pipe 5 is slightly smaller than the external diameter of the composite pipe 6, the external diameter of the conical pipe 5 is slightly larger than the internal diameter of the outer socket 4, and the internal surface of the conical pipe 5, the external surface of the composite pipe 6 and the internal surface of the outer socket 4 on the external surface of the conical pipe 5 form sealing surfaces respectively.

The outer socket 4 comprises a second cylindrical barrel 41, one end of the second cylindrical barrel 41 is fixedly connected with the external flange 42, or the external flange 42 is of an integral structure, the external flange 42 is provided with a second conical surface 420, and a T-shaped sealing ring 3 is arranged between the first conical surface 711 and the second conical surface 420. The T-shaped sealing ring 3 is made of hard alloy. The T-shaped sealing ring 3 is elastically deformed under the action of pressure and is tightly attached to the conical surfaces of the inner and outer sockets to form a sealing surface, and the sealing effect is better when the specific pressure of the fluid is higher and the specific pressure of the seal is higher; when the pressure is reduced, the T-shaped sealing ring 3 rebounds, so that the sealing reliability is ensured, and the leakage cannot occur. The T-shaped sealing ring 3 is made of hard alloy and can be repeatedly used, so the connector can be repeatedly assembled and disassembled. The T-shaped ring 3 forms a sealing surface with the first mating tapered surface 711 and the second mating tapered surface 420. The second cylindrical barrel 41 has a constraint effect, can keep stable structure without obvious plastic deformation under the action of pressure, and limits the axial displacement of the composite pipe 6 and the conical pipe 5.

Example 1 composite pipe connector, the installation procedure was as follows:

Example 2 (testing of composite pipe for leaks)

Fig. 9 shows a composite pipe connector, which includes an inner socket 7 penetrating and sleeved inside a composite pipe 6, wherein a tapered pipe 5 and an outer socket 4 are sequentially arranged on the outer wall of the composite pipe 6 from inside to outside, and the inner socket 7 and the outer socket 4 are fixedly connected through a ferrule 1.

The inner socket 7 further comprises a longitudinal sealing plate 73, the longitudinal sealing plate 73 is arranged at one end of the composite pipe 6, one end of the composite pipe is sealed, the function of a plug is achieved, and when fluid with certain pressure is input, whether leakage exists in the composite pipe 6 can be obtained according to air tightness tests or whether pressure of a pressure gauge drops.

Example 3 (two composite pipes connected by an inner socket)

As shown in fig. 10, a composite pipe connector includes an inner socket 7 inserted into two composite pipes 6, the inner socket is inserted into two composite pipes to be connected, the outer walls of the two composite pipes 6 are sequentially provided with a tapered pipe 5 and an outer socket 4 from inside to outside, the outer socket 4 includes a second cylindrical barrel 41, one end of the second cylindrical barrel 41 is fixedly connected with an external flange 42 or is an integral structure, the external flange 42 is provided with a second tapered surface 420, the inner socket is provided with a pair of internal flanges 71 with symmetrical structures, the inner socket is fixedly connected with the internal flange 71 or is an integral structure, each internal flange includes a first clamping surface 710 and a first tapered surface 711, the first clamping surface 710 is fixedly connected with the first tapered surface 711 or is an integral structure, the end portions of the two composite pipes and the two tapered pipes are respectively located in the first clamping surfaces 710, and the two internal flanges are respectively fixedly connected with the two outer sockets through a clamping sleeve 1. And a T-shaped sealing ring 3 is arranged between the first conical surface 711 and the second conical surface 420. The inner socket 7 now not only serves a supporting function, but also a connecting function. The composite pipe connector is suitable for the working condition that welding cannot be performed.

The above description is only a preferred embodiment of the present application and is not intended to limit the present application, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, improvement and the like made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. The composite pipe connector is characterized by comprising an inner socket penetrating and sleeved in a composite pipe, wherein the outer wall of the composite pipe is sequentially provided with a conical pipe and an outer socket, and the inner socket and the outer socket are fixedly connected through a clamping sleeve.

2. The composite pipe connector according to claim 1, wherein the inner socket comprises a first cylindrical tube, the front end of the first cylindrical tube is connected with the inner connecting flange, the diameter of the rear end of the first cylindrical tube is not smaller than that of the front end of the first cylindrical tube, an inverted sawtooth pattern is arranged on the outer wall of the first cylindrical tube, and sealing grooves are formed in both ends of the first cylindrical tube, so that a sealing ring is arranged in each sealing groove;

the inner connection flange comprises a clamping surface I and a conical surface I which are fixedly connected or are of an integrated structure, and the end parts of the composite pipe and the conical pipe are positioned in the clamping surface.

3. The composite pipe connector as claimed in claim 1, wherein the tapered pipe outer wall surface is a tapered surface having a thickness varying in an axial direction, and the thickness increases toward an end of the ferrule and gradually decreases toward an end of the ferrule away from the ferrule; the inner wall of the conical tube is provided with T-shaped patterns, and one end of the conical tube close to the clamping sleeve is provided with a discontinuous longitudinal multi-petal structure.

4. The composite pipe connector of claim 1, wherein the inner diameter of the tapered pipe is slightly smaller than the outer diameter of the composite pipe, the outer diameter of the tapered pipe is slightly larger than the inner diameter of the outer socket, and the inner surface of the tapered pipe forms a sealing surface with the outer surface of the composite pipe and the inner surface of the outer socket of the tapered pipe.

5. The composite pipe connector as claimed in claim 2, wherein the outer socket comprises a second cylindrical barrel, one end of the second cylindrical barrel is fixedly connected with the external flange, the external flange is provided with a second conical surface, and a T-shaped sealing ring is arranged between the first conical surface and the second conical surface.

6. The composite pipe connector as claimed in claim 5, wherein the T-shaped sealing ring is made of cemented carbide.

7. The composite pipe connector of claim 2, wherein the inner hub further comprises a longitudinal seal plate disposed at one end of the composite pipe.

8. The composite pipe connector as claimed in claim 1, wherein the inner socket is inserted into two composite pipes to be connected, the inner socket is provided with a pair of internal flanges with symmetrical structure, each internal flange comprises a first clamping surface and a first conical surface, the first clamping surface and the first conical surface are fixedly connected, or are in an integral structure, the ends of the composite pipes and the conical pipes are positioned in the first clamping surface, and the two pairs of internal flanges are fixedly connected with the two outer sockets through clamping sleeves respectively.