Flexible three-way expansion joint for pipeline

Abstract

The utility model relates to a flexible three-way expansion joint for a pipeline. The flexible three-way expansion joint comprises a corrugated pipe, a clamping ring, a connecting ring, a limiting shaft and a limiting piece. Clamping rings are coaxially fixed to the outer side walls of the two ends of the corrugated pipe correspondingly, and a plurality of clamping grooves are formed in the outer side wall of each clamping ring in the circumferential direction; one end of the connecting ring is installed on the pipeline, and the other end of the connecting ring abuts against the clamping ring. One end of the limiting shaft is hinged to the outer side wall of the connecting ring; the limiting shafts and the clamping grooves are arranged in a one-to-one correspondence mode, and the limiting shafts can rotate into the clamping grooves. The limiting piece is installed on the limiting shaft, and the position of the limiting piece on the limiting shaft is adjustable so that the limiting piece can abut against the end of the clamping ring. The limiting shafts are clamped into the corresponding clamping grooves; by adjusting the position of the limiting piece and rotating the limiting shaft, the corrugated pipe can be replaced conveniently and quickly, the whole body does not need to be replaced, and then material loss is reduced; and through flexible arrangement of the corrugated pipe, compensation of three-direction displacement of the pipeline can be achieved.

Description

Technical Field

[0001] This utility model relates to the field of pipeline expansion joint technology, specifically to a flexible three-way expansion joint for pipelines. Background Technology

[0002] Expansion joints are flexible elements that can effectively compensate for axial deformation. For example, expansion joints welded to the shell of a fixed tube sheet heat exchanger have high axial flexibility and are easy to deform, which can compensate for the thermal expansion difference between the tubes and the shell due to different wall temperatures and reduce their axial load. Corrugated pipe expansion joints are a type of expansion joint made of metal corrugated pipes. They can expand and contract along the pipe axis and also allow for a small amount of bending.

[0003] Existing bellows expansion joints mainly consist of two connecting ends, with a bellows in the middle of the two connecting ends. Both connecting ends are fixed to the two ends of the bellows by welding. The bellows in the middle needs to bear axial loads and is prone to damage. However, the connecting ends and the bellows are difficult to remove and replace after welding, and it is wasteful to replace the whole thing. Utility Model Content

[0004] In view of the above-mentioned problems in the existing technology, the technical problem to be solved by this utility model is that the existing bellows expansion joint is prone to damage when it needs to bear axial load in the middle, but it is difficult to disassemble and replace after the connection end and the bellows are welded, and it is wasteful to replace the whole thing.

[0005] To solve the above-mentioned technical problems, this utility model adopts the following technical solution: a flexible three-way expansion joint for pipelines, comprising:

[0006] Corrugated pipe;

[0007] The bellows has retaining rings coaxially fixed to the outer walls of both ends, and each retaining ring has multiple retaining grooves on its outer wall in the circumferential direction.

[0008] A connecting ring, one end of which is mounted on a pipe, and the other end of which abuts against a retaining ring;

[0009] A limiting shaft, one end of which is hinged to the outer wall of the connecting ring; the limiting shaft and the slot are correspondingly arranged one-to-one, and the limiting shaft can rotate into the slot; and

[0010] A limiting member is mounted on the limiting shaft, and the position of the limiting member on the limiting shaft is adjustable so that the limiting member abuts against the end of the retaining ring.

[0011] Preferably, it also includes a flange; the connecting ring is installed on the pipe via the flange.

[0012] Preferably, it also includes a pull rod and an adjusting nut; the pull rod slides through both flanges; and each flange has a nut at both ends, the nut being threadedly connected to the pull rod.

[0013] Preferably, the limiting member is threadedly connected to the limiting shaft.

[0014] Preferably, it also includes a gasket; the gasket is sleeved on the limiting shaft and the gasket is located between the limiting member and the retaining ring.

[0015] Preferably, it also includes extension rings; extension rings are coaxially fixed at both ends of the bellows, and the outer sidewall of the extension ring is configured to cooperate with the inner sidewall of the connecting ring.

[0016] Preferably, it further includes an abutment ring, which is disposed inside the connecting ring; and the abutment ring is threadedly connected to the connecting ring.

[0017] Preferably, it also includes a sealing ring; the sealing ring is fixedly installed at one end of the extension ring near the abutment ring.

[0018] Compared with the prior art, the present invention has at least the following advantages:

[0019] 1. In this utility model, the connecting ring is installed on the pipe, and then the connecting ring and the corrugated pipe are coaxially aligned so that the connecting ring coaxially abuts against one end of the retaining ring; then the limiting shaft is rotated so that the limiting shaft is engaged in the corresponding retaining groove; the position of the limiting member on the limiting shaft is adjusted so that the limiting member abuts against the end of the retaining ring away from the connecting ring; a pressure is applied to the retaining ring by the limiting member and the connecting ring, thus clamping the retaining ring and realizing the installation and fixation of the corrugated pipe; and after the corrugated pipe is damaged, the corrugated pipe can be easily and quickly replaced by adjusting the position of the limiting member and rotating the limiting shaft, without the need to replace the whole pipe, thereby reducing material waste; and through the flexible design of the corrugated pipe, compensation for the three-dimensional displacement of the pipe can be achieved.

[0020] 2. In this utility model, after the extension ring is inserted into the connecting ring, the extension ring abuts against one end of the abutting ring inside the connecting ring; when the abutting ring is rotated, the position of the abutting ring inside the connecting ring can be adjusted, so that one end of the connecting ring separates from the retaining ring, thereby adjusting the distance between the retaining ring and the connecting ring, and thus adjusting the overall length of the expansion joint. Attached Figure Description

[0021] To more clearly illustrate the specific embodiments of this utility model, the accompanying drawings used in the specific embodiments will be briefly described below. In all the drawings, the elements or parts are not necessarily drawn to scale.

[0022] Figure 1This is a perspective view of a flexible three-way expansion joint for pipelines provided in this embodiment.

[0023] Figure 2 This is a partial cross-sectional view of a flexible three-way expansion joint for pipelines provided in this embodiment.

[0024] Reference numerals in the attached drawings: 1. Bellows; 2. Snap ring; 3. Connecting ring; 4. Limiting shaft; 5. Limiting component; 6. Snap groove; 7. Flange; 8. Tie rod; 9. Adjusting nut; 10. Gasket; 11. Extension ring; 12. Abutment ring; 13. Sealing ring. Detailed Implementation

[0025] To further illustrate the technical means and effects adopted by this utility model in order to achieve the intended utility model purpose, the following detailed description of the specific implementation methods, structure, features and effects of this utility model is provided in conjunction with the accompanying drawings and preferred embodiments.

[0026] See Figure 1 and Figure 2 The present invention provides an embodiment of a flexible three-way expansion joint for pipelines, comprising: a bellows 1, a retaining ring 2, a connecting ring 3, a limiting shaft 4, and a limiting member 5; retaining rings 2 are coaxially fixed to the outer walls of both ends of the bellows 1, and multiple retaining grooves 6 are formed on the outer wall of each retaining ring 2 in the circumferential direction; one end of the connecting ring 3 is installed on the pipeline, and the other end of the connecting ring 3 abuts against the retaining ring 2; one end of the limiting shaft 4 is hinged to the outer wall of the connecting ring 3; the limiting shaft 4 and the retaining grooves 6 are arranged in a one-to-one correspondence, and the limiting shaft 4 can rotate into the retaining groove 6; the limiting member 5 is installed on the limiting shaft 4, and the position of the limiting member 5 on the limiting shaft 4 is adjustable so that the limiting member 5 abuts against the end of the retaining ring 2.

[0027] In practice, the connecting ring 3 is installed on the pipeline, and then the connecting ring 3 is coaxially aligned with the bellows 1 so that the connecting ring 3 coaxially abuts against one end of the retaining ring 2; then the limiting shaft 4 is rotated so that the limiting shaft 4 is inserted into the corresponding retaining groove 6; the position of the limiting member 5 on the limiting shaft 4 is adjusted so that the limiting member 5 abuts against the end of the retaining ring 2 away from the connecting ring 3; a pressure is applied to the retaining ring 2 by the limiting member 5 and the connecting ring 3, thus clamping the retaining ring 2 and realizing the installation and fixation of the bellows 1; and after the bellows 1 is damaged, the bellows 1 can be easily and quickly replaced by adjusting the position of the limiting member 5 and rotating the limiting shaft 4, without having to replace the whole pipe, thereby reducing material waste; and through the flexible design of the bellows 1, the three-dimensional displacement of the pipeline can be compensated.

[0028] See Figure 1 and Figure 2In other embodiments, a flange 7 is also included; the connecting ring 3 is installed on the pipe through the flange 7; the flange 7 facilitates the installation of the connecting ring 3. Furthermore, a tie rod 8 and an adjusting nut 9 are included; the tie rod 8 slides through both flanges 7; and each flange 7 has a nut at both ends, which is threadedly connected to the tie rod 8. The tie rod 8 effectively limits the movement of the bellows 1 to prevent excessive deformation, and the adjusting nut 9 effectively adjusts the extension / retraction length of the bellows 1.

[0029] See Figure 1 and Figure 2 In other embodiments, the limiting member 5 is threadedly connected to the limiting shaft 4. This threaded connection allows for adjustment of the position of the limiting member 5 along the length of the limiting shaft 4. Furthermore, a shim 10 is included; the shim 10 is sleeved on the limiting shaft 4 and located between the limiting member 5 and the retaining ring 2. Specifically, the limiting member 5 abuts against the retaining ring 2 via the shim 10; the shim 10 increases the contact area with the retaining ring 2, thereby increasing the frictional force between them.

[0030] See Figure 1 and Figure 2 In other embodiments, an extension ring 11 is also included; extension rings 11 are coaxially fixed at both ends of the bellows 1, and the outer sidewall of the extension ring 11 is configured to cooperate with the inner sidewall of the connecting ring 3. In specific implementation, the bellows 1 is inserted into the connecting ring 3 through the connecting ring 3, thereby increasing the contact area with the connecting ring 3 and improving the sealing performance between the connecting ring 3 and the bellows 1.

[0031] See Figure 1 and Figure 2 In another embodiment, an abutment ring 12 is further included, which is disposed within the connecting ring 3 and threadedly connected to the connecting ring 3. Specifically, after the extension ring 11 is inserted into the connecting ring 3, the extension ring 11 abuts against one end of the abutment ring 12 within the connecting ring 3. When the abutment ring 12 is rotated, its position within the connecting ring 3 can be adjusted, causing one end of the connecting ring 3 to separate from the retaining ring 2. This allows adjustment of the distance between the retaining ring 2 and the connecting ring 3, thereby enabling adjustment of the overall length of the expansion joint. Furthermore, a sealing ring 13 is included; the sealing ring 13 is fixedly installed at the end of the extension ring 11 near the abutment ring 12, allowing the extension ring 11 to abut against the abutment ring 12 via the sealing ring 13, further improving the sealing performance.

[0032] The above description is merely a preferred embodiment of the present utility model and is not intended to limit the present utility model in any way. Although the present utility model has been disclosed above with reference to a preferred embodiment, it is not intended to limit the present utility model. Any person skilled in the art can make some modifications or alterations to the above-disclosed technical content to create equivalent embodiments without departing from the scope of the present utility model. Any simple modifications, equivalent changes and alterations made to the above embodiments based on the technical essence of the present utility model without departing from the scope of the present utility model shall still fall within the scope of the present utility model.

Claims

1. A flexible three-way expansion joint for pipelines, characterized in that, include: Corrugated pipe; The bellows has retaining rings coaxially fixed to the outer walls of both ends, and each retaining ring has multiple retaining grooves on its outer wall in the circumferential direction. A connecting ring, one end of which is mounted on a pipe, and the other end of which abuts against a retaining ring; A limiting shaft, one end of which is hinged to the outer wall of the connecting ring; the limiting shaft and the slot are correspondingly arranged one-to-one, and the limiting shaft can rotate into the slot; and A limiting member is mounted on the limiting shaft, and the position of the limiting member on the limiting shaft is adjustable so that the limiting member abuts against the end of the retaining ring.

2. The flexible three-way expansion joint for pipelines according to claim 1, characterized in that, It also includes flanges; the connecting ring is installed on the pipe via the flanges.

3. A flexible three-way expansion joint for pipelines according to claim 2, characterized in that, It also includes a tie rod and an adjusting nut; the tie rod slides through both flanges; and each flange has a nut at both ends, the nut being threadedly connected to the tie rod.

4. A flexible three-way expansion joint for pipelines according to claim 1, characterized in that, The limiting component is threadedly connected to the limiting shaft.

5. A flexible three-way expansion joint for pipelines according to claim 4, characterized in that, It also includes a gasket; the gasket is sleeved on the limiting shaft and is located between the limiting member and the retaining ring.

6. A flexible three-way expansion joint for pipelines according to claim 1, characterized in that, It also includes extension rings; both ends of the bellows are coaxially fixed with extension rings, and the outer sidewall of the extension ring is configured to cooperate with the inner sidewall of the connecting ring.

7. A flexible three-way expansion joint for pipelines according to claim 6, characterized in that, It also includes an abutment ring, which is disposed inside the connecting ring; and the abutment ring is threadedly connected to the connecting ring.

8. A flexible three-way expansion joint for pipelines according to claim 7, characterized in that, It also includes a sealing ring; the sealing ring is fixedly installed at one end of the extension ring near the abutment ring.

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