An adjustment structure for pipeline length adjustment

Abstract

The present application discloses an adjustment structure for pipeline length adjustment, which includes a first pipe section and a second pipe section. The two ends of the first pipe section are a first fixed end and a first sliding end, and the two ends of the second pipe section are a second fixed end and a second sliding end. The first sliding end is inserted into the second pipe section by the second sliding end; a second flange is installed at the second sliding end, and an inner flange sleeved on the first pipe section is provided on the inner wall of the second pipe section. The space between the first pipe section, the second pipe section and the inner flange forms a sealing cavity, and a sealing component group is filled in the sealing cavity. A first flange is sleeved on the first pipe section, and a pressing pipe is provided between the first flange and the sealing component group. Bolts pass through the first flange and the second flange and are locked, so that the first flange tightly presses the pressing pipe against the sealing component group to seal the gap between the first pipe section and the second pipe section. The present application can effectively eliminate the length change of the pipeline caused by thermal expansion and contraction, and ensure the safe operation of the pipeline.

Description

Technical Field

[0001] The invention relates to an adjusting structure for adjusting the length of a pipeline. Background Art

[0002] During the process of pipeline production and installation, it is often necessary to adjust the subsequently installed pipelines and flanges according to the already installed pipelines and flanges. In addition, due to the change in the temperature of the fluid in the pipeline, the pipeline will have a certain degree of thermal expansion and contraction during operation, which will generate internal pressure on the pipeline and affect the safe operation of the pipeline. In order to meet the requirements of thermal expansion and contraction of pipelines, it is generally adopted to install pipe fittings such as expansion joints or expansion bends on the pipeline to ensure the safe operation of the pipeline. However, due to limitations such as installation space, some pipelines cannot use expansion joints or expansion bends, resulting in the need for the pipeline to expand and contract itself to adapt to the length changes caused by thermal expansion and contraction, which affects the safe operation of the pipeline. Summary of the invention

[0003] In order to eliminate the length change of the pipeline caused by thermal expansion and contraction and ensure the safe operation of the pipeline, the present invention proposes an adjustment structure for adjusting the length of the pipeline, which includes a first pipe section and a second pipe section extending along a first axial direction, the opposite ends of the first pipe section are respectively called a first fixed end and a first sliding end, the opposite ends of the second pipe section are respectively called a second fixed end and a second sliding end, wherein the first sliding end is inserted into the second pipe section by the second sliding end; an inner flange is welded on the inner wall of the second pipe section, and in the first axial direction, there is a distance between the inner flange and the end face of the second sliding end, and the inner flange It is freely sleeved on the first pipe section, and the space between the first pipe section, the second pipe section and the inner flange forms an annular sealing cavity, which is filled with a sealing group; a first flange is movably sleeved on the first pipe section, and a second flange is fixedly installed at the end of the second sliding end, the first flange is located on the side of the second flange away from the second fixed end, and a clamping tube is provided on the first pipe section between the first flange and the sealing group, and bolts are successively passed through the first flange and the second flange and then locked, so that the first flange presses the clamping tube tightly against the sealing group to seal the gap between the first pipe section and the second pipe section.

[0004] In the present application, the first flange and the second flange are connected together by bolts, and the sealing group in the sealing cavity is in a compressed state to seal the gap between the first pipe section and the second pipe section to ensure the sealing of the pipeline. Since the first flange is movably mounted on the first pipe section and can move synchronously with the second flange, when the length of the pipeline changes due to thermal expansion and contraction, the sealing group can slide along the outer wall of the first pipe section to avoid internal stress in the pipeline and ensure the safe operation of the pipeline. Since the first flange and the second flange move synchronously, the sealing group is always in a compressed state during the movement process, which can ensure the sealing between the first pipe section and the second pipe section.

[0005] Specifically, along the direction of the first axis, the seal assembly group includes at least five seal components stacked together in sequence. Each seal component includes an outer seal ring and an inner seal ring sleeved together, where the outer seal ring is sleeved on the outer periphery of the inner seal ring. All the outer seal rings form an outer seal group, and all the inner seal rings form an inner seal group. An annular wedge-shaped groove is formed between the inner seal group and the outer seal group. The cross-section of the wedge-shaped groove is wedge-shaped with the larger end facing the pressing pipe. A wedge-shaped ring is inserted into the wedge-shaped groove. The cross-section of the wedge-shaped ring is wedge-shaped with the larger end facing the pressing pipe. An inner pressing ring and an outer pressing ring are respectively fixedly arranged on the inner wall and the outer wall at the end of the wedge-shaped ring facing the pressing pipe. The pressing pipe tightly inserts the wedge-shaped ring into the wedge-shaped groove, and the inner pressing ring presses against the inner seal group, and the outer pressing ring presses against the outer seal group, deforming the outer seal rings and the inner seal rings by extrusion. The angle of the taper of the axial cross-section of the ring body of the wedge-shaped ring is 5-10°. Preferably, the axial cross-section of the ring body of the wedge-shaped ring is an isosceles trapezoid.

[0006] Currently, when the seal assembly group uses multiple seals stacked together, the seal assembly group is extruded from one end of the seal assembly group. Due to the frictional force between the seals and the first pipe section and the second pipe, the farther the seal is from the extrusion end, the smaller its deformation. However, over time, the deformations of the seals will gradually tend to be the same, resulting in a decrease in the sealing pressure. Therefore, it is necessary to regularly pressurize the seal assembly group to ensure the sealing performance. In this application, seal components are used to form the seal assembly group and a wedge-shaped groove is formed. When the pressing pipe is pushed, the wedge-shaped ring can extrude each inner seal ring and outer seal ring, enabling each inner seal ring and outer seal ring to simultaneously generate radial and axial deformations, making the deformations of each inner seal ring and outer seal ring tend to be the same, which can greatly reduce the secondary deformations of each inner seal ring and outer seal ring over time and can maintain the sealing performance.

[0007] Furthermore, to improve the sealing performance, inner grooves are provided on the inner peripheral surface of the inner seal ring, which are formed by the inner peripheral surface of the inner seal ring recessing radially outward; outer grooves are provided on the outer peripheral surface of the outer seal ring, which are formed by the outer peripheral surface of the outer seal ring recessing radially inward. The inner grooves and the outer grooves can generate greater deformations during the extrusion process, enabling them to maintain their deformability during long-term use and providing sealing pressure to ensure the sealing performance.

[0008] Furthermore, to form a uniform support for the inner seal ring and the outer seal ring, a support ring is provided between the seal assembly group and the inner flange. The support ring is freely sleeved on the first pipe section. The gap between the inner peripheral surface of the support ring and the outer peripheral surface of the first pipe section is 0.5-1.5 mm, and both the outer seal group and the inner seal group are supported on the support ring.

[0009] Further, to prevent the small end of the wedge ring from pressing against the support ring and affecting the extrusion of the seal assembly, a circular groove is formed on the side of the support ring facing the seal assembly, and this circular groove is used to accommodate the small end of the wedge ring.

[0010] Further, a ring-shaped support groove is provided on the side of the inner flange facing the support ring, and a ring-shaped support protrusion that can be inserted into this support groove is provided on the side of the support ring facing the inner flange. This design can effectively seal the contact between the support ring and the first pipe section, thereby avoiding friction between the support ring and the first pipe section and ensuring that the first pipe section receives uniform frictional force in the circumferential direction.

[0011] Further, to prevent the telescopic length of the pipeline from exceeding the set length, causing the seal to disengage from the end of the first sliding end and reducing the sealing performance between the first pipe section and the second pipe section, an outer flange is provided at the end of the first sliding end of the first pipe section, and this outer flange is formed by the outer wall of the first pipe section protruding radially outward. Due to the limitation of the outer flange, it is ensured that the seal always sleeved on the first pipe section.

[0012] Further, for ease of operation, the pressing pipe is welded to the first flange. This design can synchronously adjust the radial position of the pressing pipe when adjusting the radial position of the first flange, improving the operation convenience.

[0013] Further, the first flange is a split flange composed of two flap pieces, and a half pipe is welded on each flap piece, and the half pipes on the two flap pieces together form the above-mentioned pressing pipe. This design is suitable for a narrow pipeline installation space. When the first flange is pre-sleeved on the first pipe section, it will cause inconvenience in the installation of the seal. Using a split flange can hold the two flap pieces of the split flange on the first pipe section after the installation of the outer seal ring and the inner seal ring is completed. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 is a schematic structural diagram of an embodiment of the present invention.

[0015] Figure 2 is Figure 1 the view in the A-A direction in

[0016] Figure 3 is Figure 1 the enlarged view of part B in

[0017] Figure 4 is a schematic structural diagram of another embodiment. EMBODIMENTS Embodiment

[0018] Refer to Figures 1-3 , in the drawings, the direction of the first axis X indicates the first axis direction.

[0019] An adjusting structure for adjusting the length of a pipeline comprises a first pipe section 10 and a second pipe section 20 extending along a first axial direction, that is, the central axes of the first pipe section 10 and the second pipe section 20 both extend along the first axial direction.

[0020] The opposite ends of the first pipe section 10 are respectively called the first fixed end 101 and the first sliding end 102, and the opposite ends of the second pipe section 20 are respectively called the second fixed end 201 and the second sliding end 202, wherein the first sliding end 102 is inserted into the second pipe section 20 by the second sliding end 202. A third flange 12 is welded to the end of the first fixed end 101, and a fourth flange 22 is welded to the end of the second fixed end 201. The third flange 12 and the fourth flange 22 are used to be connected to the flanges of adjacent pipelines.

[0021] An inner flange 23 is welded on the inner wall of the second pipe section 20. In the first axial direction, there is a distance between the inner flange 23 and the end surface of the second sliding end 202. The inner flange 23 is freely sleeved on the first pipe section. The space between the first pipe section 10, the second pipe section 20 and the inner flange 23 forms an annular sealing cavity 35, and the sealing component group 39 is filled in the sealing cavity 35. The first flange 31 is movably sleeved on the first pipe section 10, and the second flange 36 is fixedly installed at the end of the second sliding end 202. The first flange 31 is located on the side of the second flange 36 away from the second fixed end 201. There is a clamping tube 32 between the first flange 31 and the sealing assembly 39, and the clamping tube is sleeved on the first pipe section 10. The bolts 34 pass through the first flange 31 and the second flange 36 in sequence and are locked with nuts 38, so that the first flange 31 presses the clamping tube 32 tightly against the sealing assembly 39 to seal the gap between the first pipe section and the second pipe section, so that the first pipe section is sealed and sleeved on the second pipe section.

[0022] In this embodiment, along the first axis direction, the seal assembly group 39 includes 12 seal assemblies stacked together in sequence. Each seal assembly includes an outer seal ring 392 and an inner seal ring 391 sleeved together, where the outer seal ring is sleeved on the outer periphery of the inner seal ring. All the outer seal rings form an outer seal group, and all the inner seal rings form an inner seal group. An annular wedge-shaped groove is formed between the inner seal group and the outer seal group. The cross-section of this wedge-shaped groove is wedge-shaped with the large head facing the pressing pipe 32. A wedge-shaped ring 37 is inserted into this wedge-shaped groove. The cross-section of the wedge-shaped ring 37 is wedge-shaped with the large head facing the pressing pipe 32. An inner pressing ring 372 and an outer pressing ring 373 are respectively welded on the inner wall and the outer wall of the end of the wedge-shaped ring 37 facing the pressing pipe 32. The pressing pipe 32 presses against the end face 371 of the large end of the wedge-shaped ring 37, tightly inserting the wedge-shaped ring 37 into this wedge-shaped groove, and the inner pressing ring 372 presses against the inner seal group, and the outer pressing ring 373 presses against the outer seal group, deforming each outer seal ring and inner seal ring. In this embodiment, the axial cross-section of the ring body of the wedge-shaped ring is an isosceles trapezoid, and the angle α of the taper angle of the axial cross-section of the ring body of the wedge-shaped ring is 8°.

[0023] An inner groove 393 is provided on the inner peripheral surface of each inner seal ring 391. This inner groove 393 is formed by the inner peripheral surface of the inner seal ring 391 recessing radially outward; an outer groove 394 is provided on the outer peripheral surface of each outer seal ring 392. This outer groove 394 is formed by the outer peripheral surface of the outer seal ring 392 recessing radially inward. In this embodiment, both the inner seal ring and the outer seal ring are made of nitrile rubber.

[0024] A support ring 33 is provided between the seal assembly group 39 and the inner flange 23. This support ring 33 is freely sleeved on the first pipe section 10. The gap between the inner peripheral surface of the support ring 33 and the outer peripheral surface of the first pipe section is 1 mm, and both the outer seal group and the inner seal group are supported on this support ring 33. This support ring is a steel ring.

[0025] An annular groove 331 is provided on the side of the support ring 33 facing the seal assembly group 39. This annular groove 331 is used to accommodate the small end of the wedge-shaped ring 37. When the small end of the wedge-shaped ring 37 extends out of the seal assembly group 39 towards the second fixed end direction, the annular groove is used to accommodate the small end of the wedge-shaped ring 37 to ensure the smooth extrusion of the wedge-shaped ring 37 on the seal assembly group 39.

[0026] On one side of the inner flange 23 facing the support ring 33, there is an annular support groove 231. On one side of the support ring 33 facing the inner flange 23, there is an annular support protrusion 332 that can be inserted into the support groove 231. Under the push of the seal assembly 39, the support protrusion 332 is inserted into the support groove 231, so that there is an annular gap between the inner peripheral surface of the support ring 33 and the outer peripheral surface of the first pipe section, avoiding friction between the support ring 33 and the first pipe section.

[0027] To prevent some of the inner seals from detaching from the first pipe section 10 when the first pipe section 10 and the second pipe section 20 slide relative to each other, reducing the sealing performance between the first pipe section 10 and the second pipe section 20, an outer flange 13 is welded to the end of the first sliding end 102 of the first pipe section 20. The outer flange 13 is formed by protruding radially outward from the outer wall of the first pipe section 10.

[0028] In this embodiment, the first flange 31 is an integral flange, and the pressing pipe 32 is a round pipe. Embodiment

[0029] This embodiment is basically the same as the previous embodiment, except for the structural forms of the first flange 31 and the pressing pipe 32. Please refer to Figure 4 , in this embodiment, the first flange 31 is a split flange composed of two petals 311. A half pipe 321 is welded to each petal 311. The half pipes 321 on the two petals 311 together form the pressing pipe 32. That is, both the first flange 31 and the pressing pipe 32 are of petal structure, and the pressing pipe is welded to the first flange.

[0030] The structure in this embodiment is mainly when the installation space of the pipeline is limited and it is impossible to pre - sleeve the first flange and the pressing pipe on the first pipe section before installation. The first flange and the pressing pipe can both adopt petal structures. The petals 311 carrying the half pipes 321 are clamped on the first pipe section from both sides of the first pipe section, and then the first flange is connected to the second flange with bolts 34 and nuts 38.

Claims

1. An adjustment structure for adjusting the length of a pipeline, It is characterized in that The invention comprises a first pipe section and a second pipe section extending along a first axis direction, wherein two opposite ends of the first pipe section are respectively called a first fixed end and a first sliding end, and two opposite ends of the second pipe section are respectively called a second fixed end and a second sliding end, wherein the first sliding end is inserted into the second pipe section by the second sliding end; An inner flange is welded on the inner wall of the second pipe section. In the first axial direction, there is a distance between the inner flange and the end face of the second sliding end. The inner flange is freely sleeved on the first pipe section. The space between the first pipe section, the second pipe section and the inner flange forms an annular sealing cavity, and the sealing cavity is filled with a sealing component group. A first flange is movably sleeved on the first pipe section, and a second flange is fixedly installed on the end of the second sliding end. The first flange is located on the side of the second flange away from the second fixed end. A compression tube set on the first pipe section is provided between the first flange and the sealing component group. Bolts are sequentially passed through the first flange and the second flange and then locked, so that the first flange presses the compression tube tightly against the sealing component group to seal the gap between the first pipe section and the second pipe section. Along the first axial direction, the sealing group includes at least five sealing components stacked together in sequence, and each sealing component includes an outer sealing ring and an inner sealing ring which are sleeved together, wherein the outer sealing ring is sleeved on the outer circumference of the inner sealing ring, all the outer sealing rings constitute an outer sealing group, and all the inner sealing rings constitute an inner sealing group. An annular wedge-shaped groove is formed between the inner sealing group and the outer sealing group, and the cross-section of the wedge-shaped groove is wedge-shaped with the large end facing the compression tube. A wedge-shaped ring is inserted in the wedge-shaped groove, and the cross-section of the wedge-shaped ring is wedge-shaped with the large end facing the compression tube. An inner compression ring and an outer compression ring are fixedly arranged on the inner wall and outer wall of the wedge ring facing one end of the compression tube, respectively. The compression tube tightly inserts the wedge ring in the wedge-shaped groove, and the inner compression ring presses on the inner sealing group, and the outer compression ring presses on the outer sealing group, so that each outer sealing ring and the inner sealing ring are squeezed and deformed, and the cone angle of the axial cross-section of the ring body of the wedge ring is 5-10°.

2. The adjustment structure according to claim 1, It is characterized in that An inner groove is arranged on the inner circumference of the inner sealing ring, and the inner groove is formed by the inner circumference of the inner sealing ring being recessed radially outward; an outer groove is arranged on the outer circumference of the outer sealing ring, and the outer groove is formed by the outer circumference of the outer sealing ring being recessed radially inward.

3. The adjustment structure according to claim 1, It is characterized in that A support ring is arranged between the sealing group and the inner flange. The support ring is freely mounted on the first pipe section. The gap between the inner circumference of the support ring and the outer circumference of the first pipe section is 0.5-1.5mm. Both the outer sealing group and the inner sealing group are supported on the support ring.

4. The adjustment structure according to claim 3, It is characterized in that An annular groove is provided on a side of the support ring facing the sealing element assembly, and the annular groove is used to accommodate the small end of the wedge ring.

5. The adjustment structure according to claim 3, It is characterized in that On the side of the inner flange facing the support ring, there is an annular support groove, and on the side of the support ring facing the inner flange, there is an annular support protrusion that can be inserted into the support groove.

6. The adjustment structure according to claim 1, characterized in that, at the end of the first sliding end of the first pipe section, there is an outer flange formed by the outer wall of the first pipe section protruding radially outward.

7. The adjustment structure according to claim 1, characterized in that, the pressing pipe is welded to the first flange.

8. The adjustment structure according to claim 1, characterized in that, the first flange is a split flange composed of two petals, and a half pipe is welded on each petal, and the half pipes on the two petals together form the above-mentioned pressing pipe.

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