Connecting structure of metal pipeline and non-metal pipeline

Abstract

The utility model discloses a connecting structure of a metal pipeline and a non-metal pipeline, and relates to the pipeline connecting technology. A connecting structure of a metal pipeline and a non-metal pipeline comprises a first socket, a second socket, a clamping sleeve, a T-shaped sealing ring and an outer taper sleeve. The sleeve joint I is connected with a metal pipeline, and the sleeve joint II is sleeved with a non-metal pipeline; a T-shaped sealing ring is arranged between the socket I and the socket II; the outer taper sleeve is arranged between the socket II and the non-metal pipeline; the outer taper sleeve is connected with the non-metal pipeline and arranged on the outer side of the non-metal pipeline, and the shape of the inner wall of the outer taper sleeve is matched with that of the non-metal pipeline; the outer wall of the outer taper sleeve is a conical surface, and a self-locking inclined surface matched with the outer taper sleeve is arranged on the sleeve joint II; a limiting face is arranged at the end, away from the first socket, of the self-locking inclined face, the limiting face and the self-locking inclined face are matched to form a limiting table, the limiting table is located on the movement path of the outer taper sleeve, and when the outer taper sleeve moves in the second socket back to the first socket, the end of the outer taper sleeve makes contact with the limiting table, so that the outer taper sleeve cannot be separated from the second socket.

Description

Technical Field

[0001] The utility model relates to the technical field of pipeline connection, in particular to a connection structure between a metal pipeline and a non-metal pipeline. Background Art

[0002] Pipe connection technology is one of the most basic technologies in the field of chemical machinery. The stability of pipeline connection determines the operating stability of the equipment. There are many ways to connect pipelines, such as welding, flange connection, threaded connection, socket connection, etc. In construction, the appropriate connection method should be selected according to the material of the pipe used and specific needs. Each connection method has its specific application scenarios and advantages and disadvantages. Therefore, various factors need to be considered comprehensively in practical applications, such as pipeline material, working pressure, temperature, medium, etc.

[0003] Generally speaking, the two pipes used for connection should be made of the same material and have the same physical and chemical properties, so that the connection method can be adapted to both pipes at the same time. However, in some specific application scenarios (such as petrochemical production), it is necessary to connect two pipes of different materials, such as the connection between a metal pipe and a non-metal pipe.

[0004] In the petrochemical production process, due to the complexity and diversity of the media, there are both corrosive media and high-temperature and high-pressure media. In order to meet the different media transportation requirements, it is necessary to connect metal pipes (such as seamless steel pipes, stainless steel pipes) with non-metallic pipes (such as fiberglass pipes, plastic pipes). For example, when transporting corrosive media, non-metallic pipes can be used to improve the corrosion resistance of the system; while when transporting high-temperature and high-pressure media, metal pipes are required to ensure the safety and reliability of the system.

[0005] Based on the above application requirements, the connection technology between metal pipes and non-metal pipes has also emerged. In the prior art, the connection methods between metal pipes and non-metal pipes generally include: pipe clamp connection, adapter connection, ferrule connection, etc. The above structure is adaptable to the connection of small-diameter pipes. However, for large pipes (such as DN100 and above), the internal fluid will exert a lot of pressure on the pipe. When the pipe is subjected to hundreds of kilograms of fluid pressure, when the metal pipe is connected to the non-metal pipe, the two will slip and separate, resulting in leakage. Utility Model Content

[0006] The utility model aims to provide a connection structure between a metal pipe and a non-metal pipe, which avoids leakage caused by high internal pressure through a self-locking connection method and solves the problems in the prior art.

[0007] In order to achieve the above purpose, the technical solution adopted by the utility model is as follows:

[0008] A connection structure between a metal pipe and a non-metal pipe, comprising a sleeve joint 1, a sleeve joint 2, a ferrule, a T-shaped sealing ring, and an outer cone sleeve; the sleeve joint 1 is connected to the metal pipe, and the sleeve joint 2 is sleeved with the non-metal pipe; a T-shaped sealing ring is arranged between the sleeve joint 1 and the sleeve joint 2; the sleeve joint 1 and the sleeve joint 2 clamp the ribs of the T-shaped sealing ring; two ferrules clamp the sleeve joint 1 and the sleeve joint 2; sealing cone surfaces are arranged inside the sleeve joint 1 and the sleeve joint 2, and the sealing cone surfaces and two T-shaped arms of the T-shaped sealing ring respectively form elastic seals; the two ferrules are fastened with bolts;

[0009] The outer cone sleeve is arranged between the second sleeve and the non-metallic pipe; the outer cone sleeve is connected to the non-metallic pipe, the outer cone sleeve is arranged on the outside of the non-metallic pipe, and the inner wall shape of the outer cone sleeve matches the non-metallic pipe; the outer wall of the outer cone sleeve is a conical surface, and the second sleeve is provided with a self-locking inclined surface for cooperating with the outer cone sleeve; a limiting surface is provided at the end of the self-locking inclined surface away from the first sleeve, and the limiting surface cooperates with the self-locking inclined surface to form a limiting platform, and the limiting platform is located on the movement path of the outer cone sleeve, and when the outer cone sleeve moves in the second sleeve with its back to the first sleeve, the end of the outer cone sleeve will contact the limiting platform, so that the outer cone sleeve cannot be separated from the second sleeve.

[0010] As a preferred technical solution, the outer diameter of the end of the outer cone sleeve close to the first sleeve joint is larger than the outer diameter of the end of the outer cone sleeve away from the first sleeve joint.

[0011] As a preferred technical solution, a strip opening is provided on the outer cone sleeve, and one end of the strip opening passes through the end of the outer cone sleeve; the contact portion between the assembled outer cone sleeve and the second sleeve is squeezed to produce a certain extrusion deformation, so that the outer cone sleeve holds the non-metallic pipe tightly, and when the non-metallic pipe moves in the direction away from the first sleeve, the relative inclination of the self-locking inclined surface and the outer cone sleeve makes the self-locking inclined surface of the second sleeve block the movement path of the outer cone sleeve, forcing the outer cone sleeve to deform.

[0012] As a preferred technical solution, there are a plurality of strip-shaped openings which are evenly distributed on the outer wall of the outer cone sleeve.

[0013] As a preferred technical solution, sleeve one includes a connection surface facing the non-metallic pipe; a tubular connection portion of the sleeve non-metallic pipe is provided on the connection surface, and the non-metallic pipe is plugged into the tubular connection portion to complete the connection with sleeve one; a fluid channel is opened on the central axis of sleeve one.

[0014] As a preferred technical solution, the outer wall of the tubular connecting portion of the sleeve one is provided with pipe surface teeth. After assembly, the pipe surface teeth contact the non-metallic pipe and a clamping connection is achieved through friction.

[0015] As a preferred technical solution, the sleeve 1 includes a welding surface facing the metal pipe, which is welded to the metal pipe.

[0016] As a preferred technical solution, the two ferrules are fastened with spherical bolts.

[0017] Compared with the prior art, the utility model has the following beneficial effects:

[0018] In the utility model, the self-locking of the non-metallic pipe during displacement is achieved by arranging the cooperation between the outer cone sleeve and the sleeve section 2, and the problem of non-metallic pipe slippage caused by high fluid pressure in the prior art is eliminated. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a cross-sectional view of the utility model.

[0020] Figure 2 It is a schematic diagram of the structure of the outer cone sleeve.

[0021] Among them, the figure numbers are as follows: 1-sleeve joint one, 101-welding surface, 102-tubular connecting part, 103-fluid channel, 2-sleeve joint two, 3-T-type sealing ring, 4-ferrule, 5-spherical bolt, 6-outer cone sleeve, 601-strip opening, 7-non-metallic pipe. DETAILED DESCRIPTION

[0022] In order to make the purpose, technical solution and advantages of the present application more clearly understood, the present application is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and are not used to limit the present application.

[0023] On the contrary, the present application covers any substitution, modification, equivalent method and scheme made on the essence and scope of the present application as defined by the claims. Further, in order to make the public have a better understanding of the present application, some specific details are described in detail in the detailed description of the present application below. Those skilled in the art can fully understand the present application without the description of these details. Example

[0024] like Figure 1-2 As shown, a connection structure between a metal pipe and a non-metal pipe 7 includes a sleeve 1, a sleeve 2, a ferrule 4, a T-shaped sealing ring 3, and an outer cone sleeve 6.

[0025] Among them, socket 1 is welded to the metal pipe, socket 1 and socket 2 are socketed with non-metallic pipe 7, and a T-shaped sealing ring 3 is provided between socket 1 and socket 2; socket 1 and socket 2 clamp the ribs of T-shaped sealing ring 3; two clamping sleeves 4 clamp socket 1 and socket 2; under the action of clamping sleeve 4, socket 1, socket 2, metal pipe and non-metallic pipe 7 form a strong whole. Sealing cone surfaces are provided in socket 1 and socket 2, and the sealing cone surfaces form elastic seals with the two T-shaped arms of T-shaped sealing ring 3 respectively. Threaded holes are provided on clamping sleeve 4, and ball bolt 5 passes through the threaded holes and is fastened with nuts. The axis of the ball bolt is perpendicular to the axial direction of socket 1 and socket 2.

[0026] Furthermore, the sleeve 1 includes a welding surface 101 facing the metal pipe and a connection surface facing the non-metal pipe 7; the welding surface 101 is a plane and is used to weld with the end of the metal pipe. A tubular connection part 102 of the sleeve non-metal pipe 7 is provided on the connection surface, and the non-metal pipe 7 is plugged into the tubular connection part 102 to complete the connection with the sleeve 1. A fluid channel 103 is provided on the central axis of the sleeve 1, one end of the fluid channel 103 passes through the welding surface 101, and the other end is connected to the tubular connection part 102. The metal pipe and the non-metal pipe 7 are connected through the fluid channel 103.

[0027] Further, the outer cone sleeve 6 is arranged between the sleeve joint 2 and the non-metallic pipe 7. The outer cone sleeve 6 is arranged outside the non-metallic pipe 7, and the inner wall shape of the outer cone sleeve 6 matches the non-metallic pipe 7. The outer wall of the outer cone sleeve 6 is a conical surface. Among them, as a preferred embodiment, the outer diameter of the end of the outer cone sleeve 6 close to the sleeve joint 1 is greater than the outer diameter of the end of the outer cone sleeve 6 away from the sleeve joint 1.

[0028] The sleeve 2 is provided with a sealing cone surface for realizing elastic sealing with the arm of the T-shaped sealing ring 3, and the sleeve 2 is provided with a self-locking inclined surface for cooperating with the outer cone sleeve 6; the end of the self-locking inclined surface away from the sleeve 1 is provided with a limiting surface, and the limiting surface cooperates with the self-locking inclined surface to form a limiting platform, and the limiting platform is located on the movement path of the outer cone sleeve 6. When the outer cone sleeve 6 moves in the sleeve 2 with its back to the sleeve 1, the end of the outer cone sleeve 6 will contact the limiting platform, so that the outer cone sleeve 6 cannot be separated from the sleeve 2. Since the outer cone sleeve 6 is connected to the non-metallic pipe 7, the non-metallic pipe 7 is restricted from being separated from the sleeve 2, thereby solving the problem of non-metallic pipe 7 slipping due to high fluid pressure in the prior art.

[0029] Furthermore, the connection method of the non-metallic pipe 7 and the sleeve 1 and the sleeve 2 is as follows:

[0030] The outer wall of the tubular connecting portion 102 of the sleeve 1 is provided with pipe surface teeth. After assembly, the pipe surface teeth contact the non-metallic pipe 7 to generate greater friction to achieve clamping.

[0031] The outer cone sleeve 6 is provided with a strip opening 601, one end of which passes through the larger outer diameter end of the outer cone sleeve 6. The contact part between the assembled outer cone sleeve 6 and the sleeve joint 2 is squeezed to produce a certain squeezing deformation, so that the outer cone sleeve 6 holds the non-metallic pipe 7 tightly. When the non-metallic pipe 7 moves in the direction away from the sleeve joint 1, the relative slope of the self-locking inclined surface and the outer cone sleeve 6 makes the self-locking inclined surface of the sleeve joint 2 2 block the movement path of the outer cone sleeve 6, forcing the outer cone sleeve 6 to deform, so that the outer cone sleeve 6 holds the non-metallic pipe 7 more tightly, so that the two form a strong whole. The arrangement of the strip opening 601 also allows the outer cone sleeve 6 to have deformation space.

[0032] As a preferred embodiment, there are a plurality of strip-shaped openings 601 , which are evenly distributed on the outer wall of the outer cone sleeve 6 .

[0033] It is worth noting that, based on the above structural design, in order to solve the same technical problem, even if some insubstantial improvements are made on the present invention, they also fall within the protection scope of the present invention.

Claims

1. A connection structure between a metal pipe and a non-metal pipe, characterized in that: It comprises a sleeve section 1, a sleeve section 2, a ferrule, a T-shaped sealing ring and an outer cone sleeve; the sleeve section 1 is connected with a metal pipe, and the sleeve section 2 is sleeved with a non-metallic pipe; a T-shaped sealing ring is arranged between the sleeve section 1 and the sleeve section 2; the sleeve section 1 and the sleeve section 2 clamp the ribs of the T-shaped sealing ring; two ferrules clamp the sleeve section 1 and the sleeve section 2; sealing cone surfaces are arranged inside the sleeve section 1 and the sleeve section 2, and the sealing cone surfaces and the two T-shaped arms of the T-shaped sealing ring respectively form elastic seals; the two ferrules are fastened with bolts; The outer cone sleeve is arranged between the second sleeve and the non-metallic pipe; the outer cone sleeve is connected to the non-metallic pipe, the outer cone sleeve is arranged on the outside of the non-metallic pipe, and the inner wall shape of the outer cone sleeve matches the non-metallic pipe; the outer wall of the outer cone sleeve is a conical surface, and the second sleeve is provided with a self-locking inclined surface for cooperating with the outer cone sleeve; a limiting surface is provided at the end of the self-locking inclined surface away from the first sleeve, and the limiting surface cooperates with the self-locking inclined surface to form a limiting platform, and the limiting platform is located on the movement path of the outer cone sleeve, and when the outer cone sleeve moves in the second sleeve with its back to the first sleeve, the end of the outer cone sleeve will contact the limiting platform, so that the outer cone sleeve cannot be separated from the second sleeve.

2. A connection structure between a metal pipe and a non-metal pipe according to claim 1, characterized in that: The outer diameter of the end of the outer cone sleeve close to the first sleeve joint is greater than the outer diameter of the end of the outer cone sleeve away from the first sleeve joint.

3. The connection structure of a metal pipe and a non-metal pipe according to claim 1, characterized in that: A strip opening is provided on the outer cone sleeve, one end of which passes through the end of the outer cone sleeve; the contact portion between the assembled outer cone sleeve and the second sleeve is squeezed to produce a certain extrusion deformation, so that the outer cone sleeve holds the non-metallic pipe tightly. When the non-metallic pipe moves in the direction away from the first sleeve, the relative inclination of the self-locking inclined surface and the outer cone sleeve makes the self-locking inclined surface of the second sleeve block the movement path of the outer cone sleeve, forcing the outer cone sleeve to deform.

4. The connection structure of a metal pipe and a non-metal pipe according to claim 3, characterized in that: There are a plurality of strip-shaped openings which are evenly distributed on the outer wall of the outer cone sleeve.

5. The connection structure of a metal pipe and a non-metal pipe according to claim 1, characterized in that: The sleeve one includes a connection surface facing the non-metallic pipe; a tubular connection part of the sleeve non-metallic pipe is arranged on the connection surface, and the non-metallic pipe is plugged into the tubular connection part to complete the connection with the sleeve one; a fluid channel is opened on the central axis of the sleeve one.

6. A connection structure between a metal pipe and a non-metal pipe according to claim 5, characterized in that: The outer wall of the tubular connection part of the sleeve section 1 is provided with pipe surface teeth. After assembly, the pipe surface teeth contact the non-metallic pipe and a clamping connection is achieved through friction.

7. The connection structure of a metal pipe and a non-metal pipe according to claim 1, characterized in that: The socket one includes a welding surface facing the metal pipe, which is welded to the metal pipe.

8. The connection structure of a metal pipe and a non-metal pipe according to claim 1, characterized in that: The two ferrules are fastened with ball bolts.

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