Bypass straight pipe pressure balance type expansion joint

Abstract

The invention provides a bypass straight pipe pressure balance type expansion joint which comprises an inlet pipe, an outlet pipe and a second outer pipe, the ends, located in the second outer pipe, of the inlet pipe and the outlet pipe are provided with a first seal head and a second seal head respectively, the end, close to the outlet pipe, of the first seal head is provided with a first outer pipe, the outlet pipe further comprises a connecting pipe, and the connecting pipe is connected with the first outer pipe. The connecting pipe is located on the side, close to the inlet pipe, of the second end socket, a corrugated pipe assembly is arranged between the first outer pipe and the connecting pipe and comprises a first corrugated pipe, and the first corrugated pipe bears internal pressure applied to the inner wall of the first corrugated pipe by fluid media. The bypass straight pipe pressure balance type expansion joint is of a full-internal-pressure structure, can balance pressure and thrust of a pipeline, has the advantages of being small in overall rigidity, high in pressure bearing capacity, uniform in displacement and the like, and can meet the application requirement of a high-pressure pipeline.

Description

Technical Field

[0001] The invention relates to the technical field of high-pressure pipelines, and in particular to a bypass straight pipe pressure-balanced expansion joint. Background Art

[0002] An expansion joint refers to a flexible element that can effectively compensate for axial deformation. It can not only compensate for the thermal expansion and contraction of the pipeline, alleviate pipeline pressure changes, and solve problems such as pipeline misalignment and deflection, but also absorb vibration and impact, resist corrosion and high temperature and high pressure, etc., and plays a vital role in the safe operation of the pipeline system.

[0003] Among them, the straight-tube pressure-balanced expansion joint can not only absorb large lateral displacements, but also balance the pressure thrust, and can meet the pipeline layout and installation requirements of crude oil pipelines. Among them, the straight-through straight-tube pressure-balanced expansion joint can balance the pipeline pressure thrust while meeting the large compensation amount, but it has the disadvantages of large elastic reaction force caused by absorbing the thermal expansion of the pipeline due to its large rigidity and large overall dimensions; while the bypass straight-tube pressure-balanced expansion joint omits the balance bellows by changing the flow channel, and has the advantage of small overall rigidity, but the pressure-bearing capacity is limited because the bellows is an external pressure structure.

[0004] In view of this, the present invention is proposed. Summary of the invention

[0005] The problem solved by the invention is that the existing bypass straight pipe pressure balance type expansion joint has an unreasonable structure and is difficult to be used in high-pressure pipelines.

[0006] In order to solve the above problems, the present invention provides a bypass straight pipe pressure-balanced expansion joint, comprising an inlet pipe, an outlet pipe, and a second outer pipe, wherein the inlet pipe and the outlet pipe are provided with a first head and a second head at one end located in the second outer pipe, respectively, and the first head is provided with a first outer pipe at one end close to the outlet pipe, and the outlet pipe also comprises a connecting pipe, and the connecting pipe is located on a side of the second head close to the inlet pipe, and a bellows assembly is provided between the first outer pipe and the connecting pipe, and the bellows assembly comprises a first bellows, and the first bellows withstands the internal pressure applied to its inner wall by the fluid medium. This arrangement enables the expansion joint to be a full internal pressure structure, which can meet the use requirements of high-pressure pipelines and has a wide range of uses. Preferably, the bypass straight pipe pressure-balanced expansion joint is used for high-pressure pipelines.

[0007] Preferably, the bellows assembly includes a first intermediate tube, the first bellows is located on at least one side of the first intermediate tube, and a first reinforcement ring is arranged on the periphery of the first bellows. This arrangement can restrict the circumferential deformation of the first bellows, and can provide radial support at the trough, thereby preventing the first bellows from buckling under the action of internal pressure, thereby improving the pressure bearing capacity; at the same time, the first reinforcement ring is used to evenly distribute the displacement, thereby avoiding damage and leakage of the first bellows due to excessive stretching or compression, thereby ensuring the safe and stable operation of the expansion joint.

[0008] Preferably, the bellows assembly is connected to the first outer tube and the connecting tube respectively through the end tube assembly, and the first end cap, the first outer tube, the bellows assembly, the connecting tube and the second end cap together form a closed first cavity.

[0009] Preferably, the connecting pipe is located inside the first outer pipe, and the bellows assembly is located between the first outer pipe and the connecting pipe. This arrangement provides an assembly space for the bellows assembly, while ensuring that the outer wall of the bellows assembly is located inside the first cavity, while the inner wall is in direct contact with the flowing medium, thereby being applied with internal pressure.

[0010] Preferably, the end tube assembly includes a first end tube and a first ring plate connected to each other, the first ring plate is connected to the connecting tube at an end away from the first end tube, and the first end tube is fixedly connected to one end of the bellows assembly; the end tube assembly also includes a second end tube and a second ring plate connected to each other, the second ring plate is connected to the first outer tube at an end away from the second end tube, and the second end tube is fixedly connected to the other end of the bellows assembly. This arrangement has a simple structure and is easy to produce and process.

[0011] Preferably, support ring assemblies are provided at both ends of the second outer tube, and the support ring assemblies include a first support ring and a second support ring, the first support ring and the second support ring are respectively located at both ends of the second outer tube, and the support ring assembly, the second outer tube, the first outer tube, and the bellows assembly together form a second cavity for connecting the inlet pipe and the outlet pipe. This arrangement changes the flow channel of the expansion joint, and the overall rigidity is small.

[0012] Preferably, the inlet pipe is provided with a first communicating hole at one end close to the first end cap, and the outlet pipe is provided with a second communicating hole at one end close to the second end cap, and the first communicating hole and the second communicating hole are respectively connected to the second cavity.

[0013] Preferably, the bypass straight pipe pressure-balanced expansion joint also includes an end ring assembly, one end of which is fixedly arranged on the outer peripheral side of the outlet pipe, and the other end of which is connected to the second support ring. When the outlet pipe is thermally expanded, the axial displacement generated will cause the inlet pipe to drive the second outer pipe and the second support ring end to move to the right, and the second bellows 71 will be compressed. At the same time, the inlet pipe drives the first outer pipe to move to the right, and the first bellows is stretched. The first end cap of the inlet pipe and the second end cap of the outlet pipe should be able to withstand the pressure load acting on their annular surfaces.

[0014] Preferably, the end ring assembly includes a second intermediate pipe, a second bellows is arranged at one end of the second intermediate pipe, a third support ring is arranged at the other end of the second intermediate pipe, the third support ring is connected to the outlet pipe, and a second reinforcement ring is arranged on the outer peripheral side of the second bellows. This arrangement can effectively extend and deform multiple corrugated protrusions and evenly absorb axial displacement, so that the deformation amount of each corrugated protrusion can be kept synchronously consistent, thereby achieving uniform distribution of compensation amount and avoiding elastic fatigue of corrugations at a certain local position.

[0015] Compared with the prior art, the bypass straight pipe pressure balanced expansion joint described in the embodiment of the present invention has the following beneficial effects: 1) For the first time, a bypass straight pipe pressure balanced expansion joint with a full internal pressure structure is proposed, which can be used in high-pressure working conditions and other working conditions, has the advantages of low overall stiffness and high pressure bearing capacity, and has a wide range of applications; 2) The reinforcement ring can be used to drive multiple corrugated protrusions to perform effective telescopic deformation and evenly absorb axial displacement, thereby achieving uniform distribution of compensation amount and avoiding elastic fatigue of corrugations at a certain local position; 3) The structure is simple and easy to produce and process. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 This is a schematic diagram of the structure of the bypass straight pipe pressure balance type expansion joint of the present invention;

[0017] Figure 2 for Figure 1 A partial enlarged view of the middle A;

[0018] Figure 3 for Figure 1 A partial enlarged view of point B in the middle.

[0019] Description of reference numerals:

[0020] 1-inlet pipe; 101-first end cap; 102-first connecting hole; 2-first outer pipe; 3-end pipe assembly; 31-first end pipe; 32-second end pipe; 33-first ring plate; 34-second ring plate; 4-bellows assembly; 41-first bellows; 42-first intermediate pipe; 43-first reinforcement ring; 5-second outer pipe; 6-support ring assembly; 61-first support ring; 62-second support ring; 7-end ring assembly; 71-second bellows; 72-second intermediate pipe; 73-second reinforcement ring; 74-third support ring; 8-outlet pipe; 81-second end cap; 82-second connecting hole; 83-connecting pipe; 9-first cavity; 10-second cavity. DETAILED DESCRIPTION

[0021] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and understandable, the specific embodiments of the present invention are described in detail below in conjunction with the accompanying drawings. The technical features of the embodiments of the present invention can be combined with each other without conflict.

[0022] It should be noted that all the terms used in the present invention for directional and positional indications, such as "up", "down", "left", "right", "front", "back", "vertical", "horizontal", "inside", "outside", "top", "low", "lateral", "longitudinal", "center", etc., are only used to explain the relative positional relationship and connection status between the components in a certain state (as shown in the accompanying drawings), and are only for the convenience of describing the present invention, rather than requiring the present invention to be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the descriptions of "first", "second", etc. in the present invention are only used for descriptive purposes, and cannot be understood as indicating or suggesting their relative importance or implicitly indicating the number of the indicated technical features.

[0023] In the description of the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0024] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "illustrative embodiments", "examples", "specific examples", or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner.

[0025] like Figure 1-3 As shown, a bypass straight pipe pressure balance type expansion joint includes an inlet pipe 1, an outlet pipe 8, and a second outer pipe 5. The inlet pipe 1 and the outlet pipe 8 are respectively provided with a first head 101 and a second head 81 at one end located in the second outer pipe 5. The first head 101 is provided with a first outer pipe 2 at one end close to the outlet pipe 8. The outlet pipe 8 also includes a connecting pipe 83, and the connecting pipe 83 is located on a side of the second head 81 close to the inlet pipe 1. A bellows assembly 4 is provided between the first outer pipe 2 and the connecting pipe 83. The bellows assembly 4 includes a first bellows 41, and the first bellows 41 withstands the internal pressure applied to its inner wall by the fluid medium. This arrangement makes the expansion joint a full internal pressure structure, which can meet the use requirements of high-pressure pipelines and has a wide range of uses.

[0026] Preferably, the bellows assembly 4 includes a first intermediate tube 42, the first bellows 41 is located on at least one side of the first intermediate tube 42, and a first reinforcement ring 43 is arranged on the periphery of the first bellows 41. This arrangement can restrict the circumferential deformation of the first bellows 41, and can provide radial support at the trough, thereby preventing the first bellows 41 from buckling under the action of internal pressure, thereby improving the pressure bearing capacity; at the same time, the first reinforcement ring 43 is used to evenly distribute the displacement, thereby avoiding damage and leakage of the first bellows 41 due to excessive stretching or compression, thereby ensuring the safe and stable operation of the expansion joint. Specifically, the first reinforcement ring 43 drives multiple corrugated protrusions to perform effective telescopic deformation, and evenly absorbs axial displacement, so that the deformation amount of each corrugated protrusion can be kept synchronous and consistent, thereby achieving uniform distribution of compensation amount, and avoiding elastic fatigue of the corrugations at a certain local position of the first bellows 41. Preferably, the bellows assembly 4 has two and is welded together.

[0027] As an example of the present invention, the first reinforcement ring 43 includes two semicircular ring structures, which are clamped and fastened between the corrugated protrusions of the first bellows 41 through a fixing structure, and the fixing structure includes two bosses respectively arranged on the semicircular ring structures, and mounting holes correspondingly arranged on the bosses, and a bolt assembly passing through the mounting holes to apply a fastening force to the two bosses. This arrangement can improve the high pressure bearing capacity of the bellows, is easy and quick to install, and has a high structural strength.

[0028] As an example of the present invention, the bellows assembly 4 is connected to the first outer tube 2 and the connecting tube 83 respectively through the end tube assembly 3, and the first end cap 101, the first outer tube 2, the bellows assembly 4, the connecting tube 83, and the second end cap 81 enclose a closed first cavity 9. Preferably, the connecting tube 83 is located inside the first outer tube 2, and the bellows assembly 4 is located between the first outer tube 2 and the connecting tube 83. This setting provides an assembly space for the bellows assembly 4, while ensuring that the outer wall of the bellows assembly 4 is located inside the first cavity 9, and the inner wall is directly in contact with the flowing medium, so that internal pressure is applied.

[0029] As an example of the present invention, the end tube assembly 3 includes a first end tube 31 and a first ring plate 33 connected to each other, wherein the first ring plate 33 is connected to the connecting tube 83 at an end away from the first end tube 31, and the first end tube 31 is fixedly connected to one end of the bellows assembly 4; the end tube assembly 3 also includes a second end tube 32 and a second ring plate 34 connected to each other, wherein the second ring plate 34 is connected to the first outer tube 2 at an end away from the second end tube 32, and the second end tube 32 is fixedly connected to the other end of the bellows assembly 4. The structure of the arrangement is simple and convenient for production and processing.

[0030] As an example of the present invention, support ring assemblies 6 are provided at both ends of the second outer tube 5, and the support ring assembly 6, the second outer tube 5, the first outer tube 2, and the bellows assembly 4 together form a second cavity 10 for connecting the inlet tube 1 and the outlet tube 8. This setting changes the flow channel of the expansion joint, and the overall rigidity is small. As an example of the present invention, the support ring assembly 6 includes a first support ring 61 and a second support ring 62, and the first support ring 61 and the second support ring 62 are respectively located at the two ends of the second outer tube 5. This setting has a simple structure and low production cost.

[0031] As an example of the present invention, the inlet pipe 1 is provided with a first connecting hole 102 at one end close to the first end cap 101, and the outlet pipe 8 is provided with a second connecting hole 82 at one end close to the second end cap 81, and the first connecting hole 102 and the second connecting hole 82 are respectively connected to the second cavity 10. This arrangement has a simple structure and is convenient for production and processing.

[0032] Preferably, the first communicating holes 102 are strip-shaped holes and are evenly spaced along the circumference of the inlet pipe 1, and the second communicating holes 82 are strip-shaped holes and are evenly spaced along the circumference of the outlet pipe 8. This arrangement allows the fluid to flow evenly and quickly from the first communicating holes 102 of the inlet pipe 1 to the second cavity 10, and enter the outlet pipe 8 through the second communicating holes 82, thereby achieving efficient fluid delivery.

[0033] Preferably, the bypass straight pipe pressure-balanced expansion joint further includes an end ring assembly 7, one end of which is fixedly arranged on the outer peripheral side of the outlet pipe 8, and the other end of the end ring assembly 7 is connected to the second support ring 62. When the outlet pipe 8 is thermally expanded, the axial displacement generated will cause the inlet pipe 1 to drive the second outer pipe 5 and the second support ring 62 to move to the right, and the second bellows 71 will be compressed. At the same time, the inlet pipe 1 drives the first outer pipe 2 to move to the right, and the first bellows 41 is stretched. The first end cap 101 of the inlet pipe 1 and the second end cap 81 in the outlet pipe 8 should be able to withstand the pressure load acting on their annular surfaces.

[0034] As an example of the present invention, the end ring assembly 7 includes a second intermediate pipe 72, a second bellows 71 is arranged at one end of the second intermediate pipe 72, a third support ring 74 is arranged at the other end of the second intermediate pipe 72, the third support ring 74 is connected to the outlet pipe 8, and a second reinforcement ring 73 is arranged on the outer peripheral side of the second bellows 71. This arrangement can effectively stretch and deform multiple corrugated protrusions and evenly absorb axial displacement, so that the deformation amount of each corrugated protrusion can be kept synchronously consistent, thereby achieving uniform distribution of compensation amount and avoiding elastic fatigue of corrugations at a certain local position.

[0035] The present invention also provides an assembly process for a bypass straight pipe pressure balance type expansion joint, comprising:

[0036] S1. Weld the two ends of the first intermediate tube 42 to the first corrugated tube 41 respectively, and then weld the two first corrugated tubes 41 to the first end tube 31 and the second end tube 32 respectively on the side away from the first intermediate tube 42 to form component I; preferably, a first reinforcement ring 43 is provided on the outer side of the first corrugated tube 41.

[0037] S2. The two ends of component I are respectively welded to the first ring plate 33 and the second ring plate 34 to form component III. Component III is mounted on the outlet pipe 8 and welded to form component IV.

[0038] S3, put the first outer tube 2 onto the assembly IV and weld it, weld the inlet tube 1, the first support ring 61, and the first end cap 101 to form an inlet tube assembly, weld the inlet tube assembly to the first outer tube 2, and then put the second outer tube 5 onto the assembly and weld it to the first support ring 61;

[0039] S4. Weld the two ends of the second intermediate pipe 72 to the second corrugated pipe 71 to form component II, weld one end of component II to the second support ring 62, and the other end to the third support ring 74, and then put it on the outlet pipe 8 and weld it.

[0040] Although the present invention is disclosed as above, the present invention is not limited thereto. Any person skilled in the art can make various changes and modifications without departing from the spirit and scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the scope defined by the claims.

Claims

1. A bypass straight pipe pressure balance expansion joint, comprising an inlet pipe (1), an outlet pipe (8), and a second outer pipe (5), wherein the inlet pipe (1) and the outlet pipe (8) are provided with a first end cap (101) and a second end cap (81) at one end located in the second outer pipe (5), respectively, and characterized in that: The first end cap (101) is provided with a first outer tube (2) at one end close to the outlet tube (8); the outlet tube (8) further comprises a connecting tube (83); the connecting tube (83) is located on a side of the second end cap (81) close to the inlet tube (1); a bellows assembly (4) is provided between the first outer tube (2) and the connecting tube (83); the bellows assembly (4) comprises a first bellows (41); the first bellows (41) withstands the internal pressure exerted on its inner wall by the fluid medium.

2. The bypass straight pipe pressure balanced expansion joint according to claim 1, characterized in that: The bellows assembly (4) comprises a first intermediate tube (42), the first bellows (41) is located on at least one side of the first intermediate tube (42), and a first reinforcement ring (43) is arranged on the periphery of the first bellows (41).

3. The bypass straight pipe pressure balanced expansion joint according to claim 1, characterized in that: The bellows assembly (4) is connected to the first outer tube (2) and the connecting tube (83) respectively through the end tube assembly (3); the first end cap (101), the first outer tube (2), the bellows assembly (4), the connecting tube (83) and the second end cap (81) enclose a closed first cavity (9).

4. The bypass straight pipe pressure balanced expansion joint according to claim 3 is characterized in that: The connecting pipe (83) is located inside the first outer pipe (2), and the bellows assembly (4) is located between the first outer pipe (2) and the connecting pipe (83).

5. The bypass straight pipe pressure balanced expansion joint according to claim 3, characterized in that: The end pipe assembly (3) comprises a first end pipe (31) and a first ring plate (33) which are connected to each other. The first ring plate (33) is connected to the connecting pipe (83) at an end away from the first end pipe (31). The first end pipe (31) is fixedly connected to one end of the bellows assembly (4). The end pipe assembly (3) further comprises a second end pipe (32) and a second ring plate (34) which are connected to the first outer pipe (2) at an end away from the second end pipe (32). The second end pipe (32) is fixedly connected to the other end of the bellows assembly (4).

6. The bypass straight pipe pressure balanced expansion joint according to claim 3, characterized in that: Support ring assemblies (6) are arranged at both ends of the second outer tube (5), and the support ring assembly (6) comprises a first support ring (61) and a second support ring (62). The first support ring (61) and the second support ring (62) are respectively located at the two ends of the second outer tube (5). The support ring assembly (6), the second outer tube (5), the first outer tube (2), and the bellows assembly (4) jointly form a second cavity (10) for connecting the inlet tube (1) and the outlet tube (8).

7. The bypass straight pipe pressure balanced expansion joint according to claim 6, characterized in that: The inlet pipe (1) is provided with a first connecting hole (102) at one end close to the first end cap (101), and the outlet pipe (8) is provided with a second connecting hole (82) at one end close to the second end cap (81); the first connecting hole (102) and the second connecting hole (82) are respectively connected to the second chamber (10).

8. The bypass straight pipe pressure balanced expansion joint according to claim 6, characterized in that: The bypass straight pipe pressure-balanced expansion joint also includes an end ring assembly (7), one end of which is fixedly arranged on the outer peripheral side of the outlet pipe (8), and the other end of which is connected to the second support ring (62).

9. The bypass straight pipe pressure balanced expansion joint according to claim 8, characterized in that: The end ring assembly (7) comprises a second intermediate pipe (72), a second bellows (71) is arranged at one end of the second intermediate pipe (72), a third support ring (74) is arranged at the other end of the second intermediate pipe (72), the third support ring (74) is connected to the outlet pipe (8), and a second reinforcement ring (73) is arranged on the outer peripheral side of the second bellows (71).

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