An axial type internal pressure corrugated expansion joint

Abstract

This utility model relates to the field of expansion joint technology, and in particular to an axial internal pressure corrugated expansion joint, including a support rod, a first fixed end installed on the outer side of the support rod, an inner sleeve assembly inserted into the inner side of the first fixed end, the first fixed end including a first end plate, an insertion groove opened on the inner side of the first end plate, the inner sleeve assembly including a spherical shell, an extension tube fixedly connected to the right side of the spherical shell, a rubber ring fixedly connected to the outer side of the extension tube near the right end, a buffer hole opened on the inner side of the rubber ring, a flow channel opened on the inner side of the extension tube, an arc-shaped shell fixedly connected to the inner side of the flow channel, a pressure transmission hole opened on the extension tube near the arc-shaped shell, and a through opening opened on the inner side of the arc-shaped shell. In this utility model, the device reduces the negative impact of radial compensation of the corrugated pipe, reserves space to reduce wear risk, extends service life, improves the reliability and stability of pipeline system operation, and ensures long-term safe operation.

Description

Technical Field

[0001] This utility model relates to the field of expansion joint technology, specifically to an axial internal pressure corrugated expansion joint. Background Technology

[0002] Axial-type internal pressure bellows expansion joints are compensation devices used in pipeline systems. They mainly consist of bellows, end pipes, and supports. The bellows is the core component, possessing excellent flexibility. Under internal pressure, the bellows can expand and contract axially, absorbing axial displacement caused by temperature changes, mechanical deformation, and other factors. This effectively alleviates pipeline stress and ensures the safe operation of the pipeline system. They are widely used in pipeline compensation applications in petrochemical, heating, and other fields.

[0003] In existing axial-type internal pressure bellows expansion joint designs, adding an inner sleeve inside the expansion joint can significantly reduce the flow resistance of the medium inside the bellows. This design effectively avoids self-excited vibration caused by medium flow, thereby ensuring that the bellows expansion joint can operate stably and reliably in the pipeline system.

[0004] While the inner sleeve has its advantages, it may also have a negative impact on the axial compensation capability of the bellows. When the fit clearance between the inner sleeve and the bellows is too small, the bellows will experience greater frictional resistance during expansion and contraction. This will not only reduce the compensation effect of the bellows, but may also lead to increased wear on the surface of the bellows, thereby affecting its service life and reliability. Therefore, an axial internal pressure bellows expansion joint is proposed to address the above problems. Utility Model Content

[0005] The purpose of this invention is to provide an axial internal pressure corrugated expansion joint to solve the problems mentioned in the background art.

[0006] To achieve the above objectives, this utility model provides the following technical solution:

[0007] An axially oriented internal pressure corrugated expansion joint includes a support rod with a first fixed end mounted on its outer side. An inner sleeve assembly is inserted into the inner side of the first fixed end. The first fixed end includes a first end plate with an insertion groove on its inner side. The inner sleeve assembly includes a spherical shell with an extension tube fixedly connected to its right side. A rubber ring is fixedly connected to the outer side of the extension tube near its right end. A buffer hole is formed on the inner side of the rubber ring. A flow channel is formed on the inner side of the extension tube. An arc-shaped shell is fixedly connected to the inner side of the flow channel. A pressure transmission hole is formed on the extension tube near the arc-shaped shell. A through-hole is formed on the inner side of the arc-shaped shell.

[0008] As a further optimization of this utility model, a corrugated pipe and a second end plate are fixedly connected to the right side of the first end plate in sequence, and a movable column groove is opened on the inner side of the second end plate.

[0009] As a further optimization of this utility model, the insertion groove, the inner side of the corrugated pipe, and the movable column groove are connected; the outer sides of the first end plate and the second end plate are both fixed with support rods; and the opening shape of the right side of the insertion groove is spherical.

[0010] As a further optimization of this utility model, the spherical shell is a hollow hemisphere, and the outer side of the spherical shell fits into the inner side of the insertion groove.

[0011] As a further optimization of this utility model, a gap is provided between the outer side of the extension tube and the inner side of the insertion groove, and the right end of the extension tube extends into the interior of the movable column groove.

[0012] As a further optimization of this utility model, the outer side of the rubber ring is fitted with the inner side of the movable column groove, and the buffer holes are arranged in a circumferential array inside the rubber ring.

[0013] As a further optimization of this utility model, the flow channel, the through port, and the pressure transmission hole are connected, and the opening direction of the through port faces the right end of the arc-shaped shell.

[0014] Compared with the prior art, the beneficial effects of this utility model are:

[0015] In this invention, the inner sleeve assembly reduces the negative impact on the radial compensation capability of the bellows. At the same time, the cleverly reserved sufficient space between the inner sleeve and the bellows significantly reduces the risk of wear caused by frequent friction. This improvement not only effectively extends the service life of the bellows, but also greatly improves its operational reliability and stability in complex pipeline systems, providing a strong guarantee for the long-term safe operation of the pipeline system. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0017] Figure 2 This is a schematic diagram of the support rod structure of this utility model;

[0018] Figure 3 This is a cross-sectional structural diagram of the first fixed end of the present invention;

[0019] Figure 4 This utility model Figure 3 A schematic diagram of the structure at point A;

[0020] Figure 5 This is a cross-sectional structural diagram of the inner sleeve assembly of this utility model;

[0021] Figure 6 This utility model Figure 5 A schematic diagram of the structure at point B.

[0022] In the diagram: 1. Support rod;

[0023] 2. First fixed end; 21. First end plate; 22. Insertion groove; 23. Corrugated pipe; 24. Second end plate; 25. Movable column groove;

[0024] 3. Inner sleeve assembly; 31. Spherical shell; 32. Extension tube; 33. Rubber ring; 34. Buffer hole; 35. Flow channel; 36. Pressure transmission hole; 37. Arc-shaped shell; 38. Through port. Detailed Implementation

[0025] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0026] It should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the exemplary embodiments according to this application. As used herein, the singular form is intended to include the plural form as well, unless the context clearly indicates otherwise. Furthermore, it should be understood that when the terms "comprising" and / or "including" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0027] Please see Figures 1-6 This utility model provides a technical solution:

[0028] An axial internal pressure corrugated expansion joint includes a support rod 1, a first fixed end 2 installed on the outer side of the support rod 1, an inner sleeve assembly 3 inserted into the inner side of the first fixed end 2, the first fixed end 2 including a first end plate 21, an insertion groove 22 opened on the inner side of the first end plate 21, the inner sleeve assembly 3 including a spherical shell 31, an extension tube 32 fixedly connected to the right side of the spherical shell 31, a rubber ring 33 fixedly connected to the outer side of the extension tube 32 near the right end, a buffer hole 34 opened on the inner side of the rubber ring 33, a flow channel 35 opened on the inner side of the extension tube 32, an arc-shaped shell 37 fixedly connected to the inner side of the flow channel 35, a pressure transmission hole 36 opened on the extension tube 32 near the arc-shaped shell 37, and a through opening 38 opened on the inner side of the arc-shaped shell 37.

[0029] As a further implementation of this scheme, a corrugated pipe 23 and a second end plate 24 are fixedly connected to the right side of the first end plate 21 in sequence. A movable column groove 25 is opened on the inner side of the second end plate 24. The insertion groove 22, the inner side of the corrugated pipe 23 and the movable column groove 25 are connected. Support rods 1 are fixed on the outer sides of the first end plate 21 and the second end plate 24. The right side of the insertion groove 22 is spherical. Through the above settings, the device can effectively guide the fluid flow, and at the same time provide sufficient space for the expansion and contraction deformation of the corrugated pipe 23, ensuring that it can flexibly compensate for axial displacement in the pipeline system and improve the stability and reliability of operation.

[0030] As a further implementation of this solution, the spherical shell 31 is a hollow hemisphere. The outer side of the spherical shell 31 fits against the inner side of the insertion groove 22. With the above arrangement, the spherical shell 31 can move inside the insertion groove 22, which significantly reduces the negative impact on the radial compensation capability of the bellows 23. At the same time, the hollow design does not hinder the normal flow of fluid.

[0031] As a further implementation of this solution, a gap is provided between the outer side of the extension tube 32 and the inner side of the insertion groove 22, and the right end of the extension tube 32 extends into the interior of the movable column groove 25. Through the above arrangement, the gap design between the extension tube 32 and the inner side of the insertion groove 22 can significantly reduce the friction between the two, reduce the risk of wear, and extend the service life of the device. The extension design of the extension tube 32 can prevent the extension tube 32 from detaching from the interior of the movable column groove 25 when the bellows 23 moves.

[0032] As a further implementation of this solution, the outer side of the rubber ring 33 is fitted with the inner side of the movable column groove 25, and the buffer holes 34 are arranged in a circumferential array inside the rubber ring 33. Through the above arrangement, not only can it play a buffering role and reduce the impact of fluid on the bellows 23, but it can also provide a smooth flow channel for the fluid, further optimize the fluid flow path, and improve the operational stability and reliability of the device.

[0033] As a further implementation of this scheme, the flow channel 35, the through port 38 and the pressure transmission hole 36 are connected. The opening direction of the through port 38 faces the right end of the arc-shaped shell 37. Through the above arrangement, the fluid can be effectively prevented from spraying directly onto the bellows 23, which plays a protective role, reduces the impact and wear on the bellows 23, extends its service life, and further improves the operating performance and reliability of the device under complex working conditions.

[0034] Workflow: During installation, firstly, the first end plate 21 and the spherical shell 31 are positioned by the support rod 1. Then, the spherical shell 31 is oriented to the left. The extension tube 32 is inserted into the movable column groove 25 from the insertion groove 22 and the corrugated tube 23. When the rubber ring 33 passes through the insertion groove 22, the rubber ring 33 will be squeezed and deformed. After the rubber ring 33 enters the movable column groove 25, the outer side of the rubber ring 33 is tightly attached to the inside of the movable column groove 25, thus completing the installation.

[0035] In use, the fluid flows from left to right, entering the flow channel 35 through the insertion slot 22 and extension pipe 32, and then exiting from the flow channel 35. The arc-shaped shell 37 prevents the fluid from directly entering the bellows 23 from the pressure transmission hole 36, thus protecting the bellows 23. Simultaneously, the openings of the through port 38 and pressure transmission hole 36 connect the inside of the bellows 23 to the inside of the flow channel 35, allowing pressure to enter the bellows 23 promptly. Since the bellows 23 is an elastic element, it absorbs axial displacement in the pipeline system through its own expansion and contraction. When the pipeline experiences axial displacement due to thermal expansion and contraction, the bellows 23 will correspondingly lengthen or shorten to compensate for the displacement. Under internal pressure, the bellows... Pipe 23 expands axially, which can absorb the axial displacement of the pipe. At the same time, the elastic deformation of the bellows 23 can effectively buffer the stress in the pipe. When moving, the position between the first end plate 21 and the movable column groove 25 will change. The cooperation between the spherical shell 31 and the insertion groove 22 does not hinder the movement of the first end plate 21 and the second end plate 24. At the same time, the setting of the rubber ring 33 can keep the extension pipe 32 and the bellows 23 at a distance, significantly reducing the probability of the bellows 23 contacting the extension pipe 32 when moving, and improving the service life of the bellows 23. The buffer hole 34 opened in the rubber ring 33 plays a buffering role between the extension pipe 32 and the second end plate 24, and at the same time, it can allow the fluid inside the bellows 23 to flow out from the buffer hole 34.

[0036] Based on the above principles, the inner sleeve structure of the device not only significantly reduces the impact on the radial compensation capability of the bellows 23, but also leaves sufficient space between the inner sleeve structure and the bellows 23 to prevent wear caused by friction, thereby improving service life and reliability.

[0037] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. An axial internal pressure bellows expansion joint comprising a support rod (1), characterized in that: The support rod (1) has a first fixed end (2) installed on its outer side, and an inner sleeve assembly (3) is inserted into the inner side of the first fixed end (2). The first fixed end (2) includes a first end plate (21), and a plug-in groove (22) is provided on the inner side of the first end plate (21). The inner sleeve assembly (3) includes a spherical shell (31), an extension tube (32) is fixedly connected to the right side of the spherical shell (31), a rubber ring (33) is fixedly connected to the outer side of the extension tube (32) near the right end, a buffer hole (34) is opened on the inner side of the rubber ring (33), a flow channel (35) is opened on the inner side of the extension tube (32), an arc-shaped shell (37) is fixedly connected to the inner side of the flow channel (35), a pressure transmission hole (36) is opened on the extension tube (32) near the arc-shaped shell (37), and a through opening (38) is opened on the inner side of the arc-shaped shell (37).

2. The axial internal pressure corrugated expansion joint according to claim 1, characterized in that: A corrugated pipe (23) and a second end plate (24) are fixedly connected to the right side of the first end plate (21), and a movable column groove (25) is opened on the inner side of the second end plate (24).

3. The axial internal pressure corrugated expansion joint according to claim 1, characterized in that: The inner side of the insertion groove (22), the corrugated pipe (23) and the movable column groove (25) are connected. The outer side of the first end plate (21) and the second end plate (24) are both fixed with support rods (1). The opening shape of the right side of the insertion groove (22) is spherical.

4. The axial internal pressure corrugated expansion joint according to claim 1, characterized in that: The spherical shell (31) is a hollow hemisphere, and the outer side of the spherical shell (31) is fitted with the inner side of the insertion groove (22).

5. An axial internal pressure corrugated expansion joint according to claim 1, characterized in that: A gap is provided between the outer side of the extension tube (32) and the inner side of the insertion groove (22), and the right end of the extension tube (32) extends into the interior of the movable column groove (25).

6. An axial internal pressure corrugated expansion joint according to claim 1, characterized in that: The outer side of the rubber ring (33) is fitted with the inner side of the movable column groove (25), and the buffer holes (34) are arranged in a circumferential array inside the rubber ring (33).

7. An axial internal pressure corrugated expansion joint according to claim 1, characterized in that: The flow channel (35), the through port (38) and the pressure transmission hole (36) are connected, and the opening direction of the through port (38) is towards the right end of the arc-shaped shell (37).

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