CN218178220U

CN218178220U - Flexible composite pipe connecting joint for hydrogen conveying

Info

Publication number: CN218178220U
Application number: CN202222551950.6U
Authority: CN
Inventors: 赵晓; 李蓉; 孙爱进; 孙维志; 赵绍东; 朱原原
Original assignee: Jiangsu Zhengdao Marine Technology Co ltd
Current assignee: Jiangsu Zhengdao Marine Technology Co ltd
Priority date: 2022-09-26
Filing date: 2022-09-26
Publication date: 2022-12-30
Anticipated expiration: 2032-09-26

Abstract

The utility model belongs to the technical field of compound union coupling, especially, relate to flexible compound union coupling joint is carried to hydrogen, include: the connecting piece is used for connecting two flexible composite pipes, the fixing piece is used for fixing the flexible composite pipes on the connecting piece, the fixing piece comprises a first fixing piece and a second fixing piece, one end of the connecting piece is connected with the flexible composite pipes in an inner mode, the first fixing piece is connected to the end portion of the flexible composite pipes in a sleeved mode, the second fixing piece is connected to the first fixing piece in a sleeved mode, the first fixing piece is in a hollow circular truncated cone shape, the second fixing piece is in a circular truncated cone shape sleeved with the first fixing piece, and the second fixing piece is fixedly connected with the connecting piece through bolts; through this ingenious design, at the in-process of screwing up the bolt, will act on the pulling force of second mounting, act on first mounting, and then give the power that pushes down and pull to the lining of composite pipe, force tight, press from both sides the reality with flexible composite pipe, ensure the leakproofness of whole structure, avoid hydrogen to reveal.

Description

Flexible composite pipe connecting joint for hydrogen conveying

Technical Field

The utility model belongs to the technical field of compound union coupling, especially, relate to a flexible compound union coupling joint is carried to hydrogen.

Background

In the carbon center and background, hydrogen energy is considered to be an ideal interconnection medium for promoting the clean utilization of traditional petrochemical energy and supporting the large-scale development of renewable energy, and is gradually favored by main countries in the world. The growth rate of fatigue cracks of the metal pipe is accelerated by a hydrogen corrosion problem such as hydrogen embrittlement, hydrogen bubbling, decarburization and the like generated by the common carbon steel pipe, so that the performance of the pipe is early brittle failure; hydrogen induced cracking and hydrogen stress cracking bring unstable factors for safe operation of metal pipelines. Therefore, on the premise of ensuring the intrinsic safety of the hydrogen conveying pipeline, the method explores the condition that the hydrogen is conveyed by a non-metal pipeline, particularly the hydrogen is conveyed by a flexible composite pipe adopting a micromolecule gas blocking design, and the method greatly reduces the comprehensive construction cost of the pipeline while ensuring the intrinsic safety of the pipeline, thereby becoming the key point of attention of all parties in the society.

However, in section 2 of the nonmetal composite pipe for petroleum and natural gas industry: flexible composite high-pressure delivery pipe (SY/T6662.2) and "non-metallic composite pipe for oil and gas industry part 4: the metal joint of flexible composite pipeline represented by steel skeleton reinforced thermoplastic plastic composite continuous pipe and joint (SY/T6662.4) is usually installed by buckling and pressing mechanical equipment. If adopt current joint and connected mode to carry micro molecule hydrogen, have the problem as follows: firstly, metal-nonmetal reducing 'steps' exist at the connecting part of the metal joint and the flexible composite pipeline, and the risk of electrostatic accumulation due to friction with the metal 'steps' exists in the hydrogen conveying process; secondly, the pipelines are connected through thread collision heads, so that hidden troubles of combustible gas dissipation and local aggregation explosion exist. Therefore, according to the standard specification, how to design the flexible composite pipe joint for hydrogen transportation, which is safe and reliable and is convenient for field construction and installation, becomes the focus of research of the majority of technical researchers.

Disclosure of Invention

To the above problem, the utility model provides a flexible composite pipe attach fitting is carried to hydrogen to solve how to design a safe and reliable that exists among the above-mentioned background art, the technical problem that flexible composite pipe connects is carried to hydrogen of the site operation installation of being convenient for again.

In order to solve the problem, the utility model adopts the following technical scheme:

a hydrogen conveying flexible composite pipe coupling comprising: the composite pipe comprises a connecting piece, a fixing piece and a composite pipe body, wherein the inner wall of the connecting piece is hollow and cylindrical and comprises a first connecting end which is internally connected with the end part of the composite pipe body and a second connecting end which extends out of the composite pipe body, an annular first flange is arranged at the joint of the outer wall of the second connecting end and the first connecting end, and a plurality of first screw holes are formed in the first flange; the mounting is including cup jointing the first mounting on the outer wall of the tip of compound pipe body and cup jointing the second mounting on first mounting, first mounting is cavity round platform shape, including first stiff end and second stiff end, the external diameter of first stiff end is greater than the external diameter of second stiff end, the second mounting be with the cavity round platform shape that first mounting registrated, including third stiff end and fourth stiff end, the external diameter of third stiff end is greater than the external diameter of fourth stiff end, just the tip of third stiff end is provided with annular second flange, be provided with on the second flange with the supporting first screw of first flange, first screw with first screw passes through fastening nut fixed connection. The beneficial effects are as follows: through the ingenious design of first mounting and second mounting for simple structure, simple to operate of this application only need screw up the fastening nut of connecting piece and second mounting, can be fixed compound pipe body and connector, through the welded connection of second link between the compound pipe, and moreover, the leakproofness of whole equipment is better.

Further, an annular groove is formed in the inner wall of the end portion of the composite pipe body, the outer wall of the first connecting end is cylindrical, the inner diameter of the annular groove is equal to the outer diameter of the first connecting end, and the inner diameter of the first connecting end is equal to the inner diameter of the composite pipe body. The hydrogen transmission device has the beneficial effects that the connection part of the pipeline is smoother, the impact on the interface in the hydrogen transmission process is avoided, and the safety of hydrogen transmission is improved.

Further, the length of the annular groove is equal to the length of the first connecting end. The beneficial effects are as follows: the connection between the composite pipe body and the first connecting end is firmer, and the interface is smoother.

Further, the inner wall of the first fixing piece is cylindrical, and the inner diameter of the first fixing piece is equal to the outer diameter of the end part of the composite pipe body. The beneficial effects are as follows: the connection between the composite pipe body and the connecting piece is firmer.

Further, first mounting cross section is the wedge, just the external diameter of the tip of the second stiff end of first mounting is less than the internal diameter of the tip of the fourth stiff end of second mounting. The beneficial effects are as follows: the slippage of the connecting piece and the second fixing piece in the tensioning process is avoided, and the composite pipe body is more firmly fixed.

Further, the outer diameter of the first flange is equal to the outer diameter of the second flange.

Further, the first fixing piece and the end part of the composite pipe body are fixed through an adhesive.

Further, the first fixing piece and the second fixing piece are fixed through an adhesive.

Furthermore, the port department of second link is provided with the welding groove, through welded connection, has eliminated the seepage hidden danger that threaded connection exists between traditional flexible composite pipe in the hydrogen conveying process.

The utility model has the advantages that:

the utility model provides a coupling joint reasonable in design, including connecting piece and mounting, the connecting piece is used for the connection between two flexible composite pipe, the mounting is used for being fixed in the connecting piece with flexible composite pipe on, the mounting includes first mounting and second mounting, the one end of connecting piece is inscribed in flexible composite pipe, first mounting cup joints in flexible composite pipe end portion, the second mounting cup joints in first mounting, design into hollow round platform shape with first mounting, the second mounting designs into the hollow round platform shape that registrates with first mounting, through bolt fixed connection between second mounting and the connecting piece, through this ingenious design, at the in-process of screwing up the bolt, the pulling force that will act on the second mounting, act on first mounting, and then give the power of pushing down and drawing inwards of composite pipe, thereby force the flexible composite pipe, press from both sides reality, through this ingenious design, make the simple structure of equipment, and convenient installation, avoid the emergence of safe hidden danger, in addition, the leakproofness of whole equipment is better, the fastness is stronger.

Drawings

Fig. 1 is a sectional view of a flexible composite pipe joint for hydrogen transportation according to the present invention;

fig. 2 is a schematic structural view of a second connection end port of the flexible composite pipe connection joint for hydrogen transportation according to the present invention;

the notation in the figure is: 1. a connecting member; 11. a first connection end; 12. a second connection end; 121. a first flange; 2. a fixing member; 21. a first fixing member; 22. a second fixing member; 211. a first fixed end; 212. a second fixed end; 221. a third fixed end; 222. a fourth fixed end; 2211. a second flange; 22111. a screw; 3. a composite pipe body; 31. an annular groove; 4. and (6) tightening the nut.

Detailed Description

In order to better understand the purpose, structure and function of the present invention, the following description is made in detail with reference to the accompanying drawings.

As shown in fig. 1, a hydrogen conveying flexible composite pipe connecting joint comprises: the composite pipe comprises a connecting piece 1, a fixing piece 2 and a composite pipe body 3, wherein the inner wall of the connecting piece 1 is hollow cylindrical, the material is 316 or 316L hydrogen corrosion resistant material, the composite pipe comprises a first connecting end 11 and a second connecting end 12, the outer wall of the first connecting end 11 is cylindrical, the outer diameter of the first connecting end 11 is cut to be equal to the inner diameter of the end part of the composite pipe body 3, so that the first connecting end 11 is internally connected with the end part of the composite pipe body 3, an annular first flange 121 is arranged at the joint of the second connecting end 12 and the first connecting end 11, a plurality of screw holes are uniformly formed in the first flange 121 and used for being fixedly connected with a screw 22111 of a second fixing piece 22 to be described in detail below, and the other end of the second connecting end 12 is welded with a connecting joint of another composite pipe; the fixing member 2 includes a first fixing member 21 and a second fixing member 22, the first fixing member 21 is sleeved on the end portion of the composite pipe body 3, the second fixing member 22 is sleeved on the first fixing member 21, the inner wall of the first fixing member 21 is cylindrical, the outer wall is in a circular truncated cone shape, and the inner diameter of the first fixing member 21 is equal to the outer diameter of the composite pipe body 3, the first fixing member 21 includes a first fixing end 211 and a second fixing end 212, the outer diameter of the first fixing end is larger than that of the first fixing end, the second fixing member 22 is in a hollow circular truncated cone shape sleeved on the first fixing member 21, and includes a third fixing end 221 and a fourth fixing end 222, the outer diameter of the third fixing end 221 is larger than that of the fourth fixing end 222, the end portion of the third fixing end 221 is provided with an annular second flange 2211, a first screw 22111 matched with the first flange 121 is arranged on the second flange 2211, and the first screw 22111 is fixedly connected with the first screw 1211 through a fastening nut 4.

Preferably, the inner wall of the end of the composite pipe body 3 is provided with an annular groove 31, the length of the annular groove 31 is equal to the length of the first connection end 11, so that the annular groove 31 can completely wrap the first connection end 11, the height of the annular groove 31 is equal to the thickness of the first connection end 11, so that the inner diameter of the first connection end 11 is equal to the inner diameter of the composite pipe body 3, and the outer diameter of the first connection end 11 is equal to the inner diameter of the annular groove 31, so that the first connection end 11 can be sleeved in the annular groove 31.

Preferably, the first fixing member 21, the composite pipe body 3 and the second fixing member 22 are fixed by an adhesive, so that the connection of the interfaces is tighter and firmer, and the composite pipe is prevented from slipping or leaking in the transmission process.

Preferably, as shown in fig. 2, a welding groove is provided at the port of the second connection end 12, and the connection piece between the two flexible composite pipes is connected by welding, so that the hidden danger of leakage in the process of conveying hydrogen gas in the conventional threaded connection between flexible composite pipes is eliminated.

When the flexible composite pipe connecting device is used, the second fixing piece 22 is sleeved on the first fixing piece 21, the first fixing piece 21 is sleeved on the composite pipe body 3, the end part of the composite pipe body 3 is sleeved on the first connecting end 11 of the connecting piece 1, the screw 22111 of the second fixing piece 22 is assembled with the screw hole of the connecting piece 1, the flexible composite pipe is fixedly connected with the connecting joint through the fastening nut 4, and the two flexible composite pipes are connected through the welding groove of the second connecting end 12 in a welding mode.

It will be apparent to those skilled in the art that various modifications may be made to the above embodiments without departing from the general spirit and concept of the invention. Which all fall within the protection scope of the utility model. The protection scheme of the utility model takes the attached claims of the utility model as the standard.

Claims

1. The utility model provides a hydrogen carries flexible compound union coupling which characterized in that includes: the composite pipe comprises a connecting piece (1), a fixing piece (2) and a composite pipe body (3), wherein the inner wall of the connecting piece (1) is hollow and cylindrical and comprises a first connecting end (11) which is internally connected to the end part of the composite pipe body (3) and a second connecting end (12) which extends out of the composite pipe body (3), an annular first flange (121) is arranged at the joint of the outer wall of the second connecting end (12) and the first connecting end (11), and a plurality of first screw holes (1211) are formed in the first flange (121); mounting (2) including cup jointing first mounting (21) on the outer wall of the tip of compound pipe body (3) and cup jointing second mounting (22) on first mounting (21), first mounting (21) are cavity round platform shape, including first stiff end (211) and second stiff end (212), the external diameter of first stiff end (211) is greater than the external diameter of second stiff end (212), second mounting (22) for with the cavity round platform shape that first mounting (21) registrated, including third stiff end (221) and fourth stiff end (222), the external diameter of third stiff end (221) is greater than the external diameter of fourth stiff end (222), just the tip of third stiff end (221) is provided with annular second flange (2211), be provided with on second flange (1) with first flange (121) supporting first screw (11), first screw (1211) with first screw 2214) is through fastening nut (2214) fixed connection.

2. The hydrogen conveying flexible composite pipe connecting joint as recited in claim 1, wherein: the composite pipe is characterized in that an annular groove (31) is formed in the inner wall of the end portion of the composite pipe body (3), the outer wall of the first connecting end (11) is cylindrical, the inner diameter of the annular groove (31) is equal to the outer diameter of the first connecting end (11), and the inner diameter of the first connecting end (11) is equal to the inner diameter of the composite pipe body (3).

3. The hydrogen conveying flexible composite pipe connecting joint according to claim 2, characterized in that: the length of the annular groove (31) is equal to the length of the first connection end (11).

4. The hydrogen conveying flexible composite pipe connecting joint according to claim 1, characterized in that: the inner wall of the first fixing piece (21) is cylindrical, and the inner diameter of the first fixing piece (21) is equal to the outer diameter of the end part of the composite pipe body (3).

5. The hydrogen conveying flexible composite pipe connecting joint according to claim 1, characterized in that: the cross section of the first fixing piece (21) is wedge-shaped, and the outer diameter of the end part of the second fixing end (212) of the first fixing piece (21) is smaller than the inner diameter of the end part of the fourth fixing end (222) of the second fixing piece (22).

6. The hydrogen conveying flexible composite pipe connecting joint according to claim 1, characterized in that: the outer diameter of the first flange (121) is equal to the outer diameter of the second flange (2211).

7. The hydrogen conveying flexible composite pipe connecting joint according to claim 1, characterized in that: the first fixing piece (21) is fixed with the end part of the composite pipe body (3) through an adhesive.

8. The hydrogen conveying flexible composite pipe connecting joint according to claim 1, characterized in that: the first fixing piece (21) and the second fixing piece (22) are fixed through an adhesive.

9. The hydrogen conveying flexible composite pipe connecting joint as recited in claim 1, wherein: and a port of the second connecting end (12) is provided with a welding groove.