Large-diameter water supply pipeline connector sealing structure

Abstract

The utility model belongs to the technical field of pipeline sealing, and particularly relates to a large-diameter water supply pipeline connector sealing structure which comprises a sealing piece installed between a first pipeline connector end and a second pipeline connector end coaxially and oppositely arranged. The axial pressing piece is mounted in a connecting area of the first pipeline and the second pipeline; the buffer anti-settling assembly comprises a flexible buffer unit and is used for generating elastic deformation to adapt to the height difference when the pipeline is subjected to differential settlement; the rigid restraining unit is used for applying rigid restraining force to the pipeline when settlement exceeds a preset threshold value; the connecting unit is used for fixing the flexible buffering unit and the rigid restraining unit to the pipeline; when any pipeline is subjected to differential settlement, through the synergistic effect of elastic deformation of the flexible buffering unit and rigid constraint of the rigid constraint unit, tensile force opposite to the settlement direction is applied to the settlement pipeline, so that the relative height difference of the end faces of the two pipeline connectors is limited, and sealing failure is avoided; and the operation reliability of the pipeline under the complicated geological condition is obviously improved.

Description

Technical Field

[0001] This utility model belongs to the field of pipeline sealing technology, specifically relating to a sealing structure for the interface of a large-diameter water supply pipeline. Background Technology

[0002] With the acceleration of urbanization and the expansion of long-distance water transmission projects, the application of large-diameter (DN≥1000) water supply pipelines in complex geological conditions (such as soft soil foundations, fill areas, and earthquake zones) is becoming increasingly common. However, traditional interface sealing structures have the following technical defects when dealing with high-pressure conditions, thermal expansion and contraction, and uneven settlement:

[0003] 1. Poor adaptability to uneven settlement:

[0004] In areas with insufficient soil bearing capacity, pipelines are prone to uneven settlement (such as a relative height difference Δh ≥ 5mm between the two pipe interface ends). Traditional rigid flange connections cannot actively compensate for settlement deformation, resulting in uneven local pressure on the sealing ring or detachment from the sealing groove, leading to leakage.

[0005] 2. Insufficient pressure resistance and erosion resistance:

[0006] Large-diameter pipelines transport media with high pressure (typically ≥1.6MPa) and high flow velocity (≥2m / s). Traditional single rubber seals are prone to fatigue cracking under the scouring of high-pressure water flow, and their elastic modulus changes significantly under high or low temperature conditions, leading to seal failure. Utility Model Content

[0007] To address the above problems, the purpose of this utility model is to provide a sealing structure for the interface of a large-diameter water supply pipe, thereby solving the problems mentioned in the background art.

[0008] This utility model provides a sealing structure for a large-diameter water supply pipeline interface, including a sealing element installed between a first pipeline interface end and a second pipeline interface end coaxially opposite to it. The sealing element achieves radial sealing by elastically deforming and filling the gap between the two pipeline interface end faces. An axial clamping element is installed in the connection area of ​​the first and second pipelines. The axial clamping element applies an axial preload to the two pipeline interface end faces through mechanical fastening, causing the sealing element to elastically compress and maintain continuous sealing pressure. It also includes a buffer anti-settlement assembly detachably connected between the first and second pipelines, comprising a flexible buffer unit for elastic deformation to adapt to height differences when uneven settlement occurs in the pipeline; a rigid constraint unit for applying rigid constraint force to the pipeline when settlement exceeds a preset threshold; and a connecting unit for fixing the flexible buffer unit and the rigid constraint unit to the pipeline. The buffer anti-settlement assembly is configured to apply a tensile force opposite to the settlement direction to the settled pipeline through the synergistic effect of the elastic deformation of the flexible buffer unit and the rigid constraint of the rigid constraint unit when uneven settlement occurs in either pipeline, thereby limiting the relative height difference between the two pipeline interface end faces.

[0009] Preferably, the buffer and anti-settlement components are configured in two sets, symmetrically installed on both sides of the pipe connection area. Each set of buffer and anti-settlement components includes a flexible buffer unit: comprising a semi-circular elastic plate and a flexible metal core embedded inside the elastic plate. The elastic plate undergoes elastic deformation when the pipe experiences uneven settlement, and the flexible metal core is used to enhance the fatigue resistance of the elastic plate. A rigid constraint unit: comprising a hollow semi-circular fixed shell, a transition plate slidably connected to the fixed shell, and an elastic connector disposed between the fixed shell and the transition plate to provide elastic buffering in the early stage of settlement. A connection unit: comprising two sets of annular supports and a limiting plate. The annular supports fix the flexible buffer unit and the rigid constraint unit respectively, and the limiting plate is fixed to the outer wall of the pipe and axially limits the annular supports. The annular supports of the two sets of buffer and anti-settlement components are connected by bolts to form an integral constraint structure.

[0010] Preferably, the sealing element includes sealing grooves, which are respectively formed on the interface end faces of the first pipe and the second pipe, and the two sealing grooves form a sealing cavity when the pipes are connected; a sealing ring is installed in the sealing cavity, and the sealing ring and the sealing cavity are interference fit at a first temperature, and the temperature value corresponding to the first temperature is not greater than the temperature value corresponding to the lowest temperature of the pipe in the installation and use environment.

[0011] Preferably, the length of the transition plate extending into the fixed housing is one-third of the axial length of the sealing ring.

[0012] Preferably, the connecting components of the axial clamping member are two annular connecting plates and a high-strength bolt group. The two annular connecting plates are fixed to the two pipe interface ends by welding, and the high-strength bolt group is evenly distributed along the circumference of the pipe.

[0013] Preferably, the elastic plate of the flexible buffer unit is made of modified rubber material, and the flexible metal core is made of stainless steel corrugated plate or shape memory alloy to enhance fatigue resistance.

[0014] The beneficial effects of this utility model are as follows: the flexible buffer unit and the rigid constraint unit of the buffer anti-settlement component work together to apply a tensile force opposite to the settlement direction to the settled pipeline through the elastic deformation of the flexible buffer unit and the rigid constraint of the rigid constraint unit when uneven settlement occurs in any pipeline. This limits the relative height difference between the end faces of the two pipeline interfaces, avoids sealing failure, and significantly improves the reliability of pipeline operation under complex geological conditions. At the same time, radial sealing is achieved through the sealing element, and continuous sealing pressure is maintained by the axial clamping element, effectively preventing pipeline interface leakage. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the isometric three-dimensional structure of this utility model;

[0016] Figure 2 This is a frontal planar structural diagram of the present invention;

[0017] Figure 3 This is a schematic diagram of the first cross-sectional structure of the present invention;

[0018] Figure 4 This is an enlarged structural diagram of point A in this utility model;

[0019] Figure 5 This is a schematic diagram of the second cross-sectional structure of the present invention;

[0020] Figure 6 This is an enlarged structural diagram of point B in this utility model;

[0021] Figure 7 This is a schematic diagram of the structure of the present invention with the buffer anti-sinking component removed;

[0022] Figure 8 This is a three-dimensional structural diagram of the buffer anti-sinking component in this utility model.

[0023] In the diagram: 1. Seal; 2. First pipe; 3. Second pipe; 4. Axial clamping component; 5. Buffer and anti-sinking assembly; 6. Flexible buffer unit; 7. Rigid constraint unit; 8. Connecting unit; 9. Elastic plate; 10. Flexible metal inner core; 11. Fixed outer shell; 12. Transition plate; 13. Elastic connector; 14. Ring bracket; 15. Limiting plate; 16. Sealing groove; 17. Sealing ring; 18. Ring connecting plate; 19. High-strength bolt group. Detailed Implementation

[0024] To enable those skilled in the art to better understand the technical solution of this utility model, the present utility model will be described in detail below with reference to the accompanying drawings. The description in this part is only exemplary and explanatory, and should not be used to limit the scope of protection of this utility model in any way.

[0025] This utility model relates to a conventional water supply pipe interface sealing structure, which mainly includes a sealing element 1 installed between the interface end of the first pipe 2 and the interface end of the second pipe 3, which is coaxially opposite to each other, and an axial clamping element 4 installed in the connection area of ​​the first pipe 2 and the second pipe 3. The sealing element 1 fills the gap between the interface end faces of the two pipes through elastic deformation to achieve radial sealing. The axial clamping element 4 applies axial preload to the interface end faces of the two pipes through mechanical fastening, so that the sealing element 1 generates elastic compression and maintains continuous sealing pressure. Specifically, the sealing element 1 can usually be a sealing groove 16 opened on the first pipe 2 and the second pipe 3 and a sealing ring 17 filling the sealing cavity formed by the two sealing grooves 16. Usually, the sealing ring 17 is annular and made of rubber or composite material. The axial clamping element 4 consists of two annular connecting plates 18 and a high-strength bolt group 19. The two annular connecting plates 18 are fixed to the interface ends of the two pipes by welding. The high-strength bolt group 19 is evenly distributed along the circumference of the pipe and is used to connect and fix the two annular connecting plates 18 to achieve sealing at the interface of the two pipes. The above is an introduction to the conventional water supply pipe interface sealing structure.

[0026] As can be seen from the above, the existing sealing structures for water supply pipeline interfaces have the following defects in use: large-diameter pipelines are usually used to transport large amounts of fluid with high medium pressure and fast flow velocity, which poses a challenge to the pressure resistance and erosion resistance of the sealing structure. For example, the elastic modulus of the rubber sealing ring increases by 30% at a low temperature of -20℃, and the sealing gap is easily increased due to thermal expansion and contraction. At the same time, large-diameter pipelines are prone to uneven settlement under geological conditions with insufficient soil bearing capacity, and the interface end face is prone to relative height difference, which leads to uneven local pressure on the sealing ring 17 or separation from the sealing groove 16, thus causing water leakage at the interface. According to statistics, pipeline leakage caused by settlement accounts for more than 35% of water transmission project accidents. However, the existing large-diameter pipeline interfaces mostly use a single sealing ring 17 and rigid flange connection, which lacks certain adaptability and compensation capabilities. Traditional sealing rings mostly use ordinary rubber materials with a compression permanent deformation rate as high as 25%, which is prone to permanent deformation under long-term high-pressure conditions, leading to sealing failure. Meanwhile, rigid flange connections are prone to structural damage when settlement exceeds limits, resulting in high maintenance costs. Based on the above problems, this utility model adopts the following improvement method to solve them.

[0027] like Figure 1-8 As shown, a sealing structure for a large-diameter water supply pipe interface, based on the aforementioned prior art, includes a detachable buffer anti-settlement component 5 connected between the first pipe 2 and the second pipe 3. The buffer anti-settlement unit is designed in two sets, symmetrically installed on both sides of the pipe connection area. The buffer anti-settlement component 5 consists of a flexible buffer unit 6, a rigid constraint unit 7, and a connecting unit 8. The buffer anti-settlement component 5 is configured to apply a tensile force opposite to the settlement direction to the settled pipe through the synergistic effect of the elastic deformation of the flexible buffer unit 6 and the rigid constraint of the rigid constraint unit 7 when uneven settlement occurs in either pipe, thereby limiting the relative height difference between the end faces of the two pipe interfaces. Specifically, as shown... Figure 4As shown, the flexible buffer unit 6 includes a semi-circular elastic plate 9 and a flexible metal core 10 embedded inside the elastic plate 9. The elastic plate 9 can be made of improved rubber material, possessing both low-temperature flexibility and high-temperature stability, adapting to a wide temperature range environment, and used to generate elastic deformation when uneven settlement occurs in the pipeline. The flexible metal core 10 can be made of shape memory alloy or stainless steel corrugated plate. The former enhances fatigue resistance through corrugated structure, while the latter utilizes shape memory effect to achieve adaptive deformation, significantly improving the durability and intelligence level of the buffer anti-settlement component, and enhancing the fatigue resistance of the elastic plate 9; in addition, the rigid constraint unit... Unit 7 includes a hollow, semi-circular fixed outer shell 11, a transition plate 12 slidably connected to the fixed outer shell 11, and an elastic connector 13 disposed between the fixed outer shell 11 and the transition plate 12 to provide elastic buffering in the early stage of settlement. To implement the above technical solution, a connecting unit 8 is essential. This connecting unit 8 is used to fix the flexible buffer unit 6 and the rigid constraint unit 7 to the pipe. The connecting unit 8 includes annular supports 14 disposed on the first pipe 2 and the second pipe 3, and limiting plates 15 welded and fixed to the two pipes to axially limit the two annular supports 14. Figure 4 As shown, the elastic connector 13 can be a spring. When uneven settlement occurs in the pipeline, the transition plate 12 and the fixed housing 11 slide relative to each other, and the spring is stretched and deformed. With the cooperation of the flexible buffer unit 6, a force opposite to the settlement direction is applied to the lower pipeline to limit the relative height difference between the two pipeline interface end faces and delay the time when the pipeline leaks.

[0028] Furthermore, such as Figure 3-6 As shown, to facilitate understanding of this case by those skilled in the art, the steps of using the above technical solution are described in detail. When connecting two pipes, firstly, the sealing ring 17 is filled into the sealing groove 16 of the first pipe 2. Then, the interface end face of the second pipe 3 is aligned with the interface end face of the first pipe 2, so that the side of the sealing ring 17 away from the first pipe 2 is aligned with the sealing groove 16 of the second pipe 3 and inserted. After the first pipe 2 and the second pipe 3 are aligned, the annular connecting plate 18 of the two pipes is connected using high-strength bolts, so that the sealing ring 17 is sealed in the sealing cavity formed by the two slots. The above-mentioned mechanical fastening method of the axial clamping member. Highly reliable and suitable for high-pressure conditions in large-diameter pipelines, the sealing ring 17 has an interference fit with the sealing cavity at the installation temperature T0 (T0≤T_min, where T_min is the lowest ambient temperature of the pipeline), and maintains its sealing performance when the temperature rises to T_max (T_max≥T_min+20℃), avoiding leakage problems caused by thermal expansion and contraction. The sealing ring 17 can be made of an alloy plate material with a good corrosion resistance coefficient, which can extend its service life compared to traditional rubber gaskets, while enhancing the sealing performance between the two pipelines. When installing the buffer anti-sinking component 5, the elastic plate 9 is installed between the two annular connecting plates 18, such as... Figure 4 As shown, the length of the elastic plate 9 is the sum of the thickness and distance of the two limiting plates 15. In the rigid constraint unit 7 located outside the elastic plate 9, one end of the fixed shell 11 is fixedly connected to one of the annular connecting plates 18, and the end of the transition plate 12 away from the fixed shell 11 is fixedly connected to the other annular connecting plate 18. First, the two annular connecting plates 18 in one set of buffer anti-sinking components 5 are clamped on the two limiting plates 15 on one side of the pipe. Then, the two annular connecting plates 18 in another set of buffer anti-sinking components 5 are clamped on the two limiting plates 15 on the other side of the pipe. Multiple bolts are used to fix the two annular connecting plates 18 located on the same pipe to realize the connection between the buffer anti-sinking components 5 and the pipe.

[0029] Furthermore, such as Figure 3-4 As shown, when the settlement height difference of the pipeline exceeds the preset threshold, the flexible buffer unit 6 and the elastic connector 13 also experience a certain degree of elastic fatigue. To further delay the pipeline leakage time, the transition plate 12 is extended into the fixed housing 11 by one-third of the axial length of the sealing ring 17. When the uneven settlement height difference of the pipeline exceeds the preset threshold, the transition plate 12 slides to the end of the fixed housing 11, and the sealing ring 17 is not completely separated from the sealing groove 16. The elastic constraint is transformed into a rigid constraint, which can provide sufficient constraint force while avoiding excessive compression of the sealing ring 17, balancing the sealing performance and structural stability, and effectively preventing pipeline interface leakage. Figure 4 As shown, the end of the transition plate 12 is T-shaped, which can prevent the transition plate 12 from separating from the fixed housing 11 when the transition plate 12 slides to the end of the fixed housing 11.

[0030] It should be noted that, in this document, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Specific examples have been used in this document to illustrate the principles and implementation methods of this utility model. The above examples are merely to aid in understanding the method and core ideas of this utility model. The above descriptions are only preferred embodiments of this utility model. It should be pointed out that, due to the limitations of written expression, there are objectively infinite specific structures. For those skilled in the art, several improvements, modifications, or variations can be made without departing from the principles of this utility model, and the above technical features can be combined in an appropriate manner. These improvements, modifications, variations, or combinations, or the direct application of the inventive concept and technical solution to other situations without modification, should all be considered within the scope of protection of this utility model.

Claims

1. A sealing structure for a large-diameter water supply pipe interface, comprising: A sealing element (1) is installed between the interface end of the first pipe (2) and the interface end of the second pipe (3) which is coaxially opposite. The sealing element (1) fills the gap between the interface end faces of the two pipes through elastic deformation to achieve radial sealing. An axial clamping member (4) is installed in the connection area of ​​the first pipe (2) and the second pipe (3). The axial clamping member (4) applies axial preload to the end face of the two pipe interfaces through mechanical fastening, so that the sealing member (1) generates elastic compression and maintains continuous sealing pressure. The feature is that it further includes a buffer anti-sinking component (5), which is detachably connected between the first pipe (2) and the second pipe (3), including: Flexible buffer unit (6) is used to generate elastic deformation to adapt to height difference when uneven settlement occurs in the pipeline; The rigid constraint unit (7) is used to apply a rigid constraint force to the pipeline when the settlement exceeds a preset threshold. A connecting unit (8) is used to fix the flexible buffer unit (6) and the rigid constraint unit (7) to the pipeline; The buffer anti-settlement component (5) is configured to apply a tensile force opposite to the settlement direction to the settled pipe through the synergistic effect of the elastic deformation of the flexible buffer unit (6) and the rigid constraint of the rigid constraint unit (7) when uneven settlement occurs in either pipe, so as to limit the relative height difference between the end faces of the two pipe interfaces.

2. The sealing structure for a large-diameter water supply pipe interface according to claim 1, characterized in that: The buffer anti-sinking assembly (5) is configured in two sets, symmetrically installed on both sides of the pipe connection area. Each set of buffer anti-sinking assembly (5) includes: Flexible buffer unit (6): includes a semi-circular elastic plate (9) and a flexible metal core (10) embedded inside the elastic plate (9). The elastic plate (9) generates elastic deformation when the pipeline experiences uneven settlement. The flexible metal core (10) is used to enhance the fatigue resistance of the elastic plate (9). Rigid constraint unit (7): includes a hollow semi-circular fixed shell (11), a transition plate (12) slidably connected to the fixed shell (11), and an elastic connector (13) disposed between the fixed shell (11) and the transition plate (12) for providing elastic buffering in the early stage of settlement. Connection unit (8): includes two sets of annular supports (14) and limiting plates (15). The annular supports (14) fix the flexible buffer unit (6) and the rigid constraint unit (7) respectively. The limiting plates (15) are fixed to the outer wall of the pipe and axially limit the annular supports (14). Among them, the annular brackets (14) of the two sets of buffer anti-sinking components (5) are connected by bolts to form an overall constraint structure.

3. The sealing structure for a large-diameter water supply pipe interface according to claim 1, characterized in that: The seal (1) includes: Sealing grooves (16) are respectively opened on the interface end face of the first pipe (2) and the second pipe (3), and the two sealing grooves (16) form a sealing cavity when the pipes are connected; A sealing ring (17) is installed in the sealing cavity, and the sealing ring (17) and the sealing cavity are in an interference fit at the first temperature. The temperature value corresponding to the first temperature is not greater than the temperature value corresponding to the lowest temperature in the installation and use environment of the pipeline.

4. The sealing structure for a large-diameter water supply pipeline interface according to claim 2, characterized in that: The length of the transition plate (12) extending into the fixed housing (11) is one-third of the axial length of the sealing ring (17).

5. The sealing structure for a large-diameter water supply pipeline interface according to claim 1, characterized in that: The connecting parts of the axial clamping member (4) are two annular connecting plates (18) and a high-strength bolt group (19). The two annular connecting plates (18) are fixed to the two pipe interface ends by welding, and the high-strength bolt group (19) is evenly distributed along the circumference of the pipe.

6. The sealing structure for a large-diameter water supply pipeline interface according to claim 2, characterized in that: The flexible buffer unit (6) has an elastic plate (9) made of modified rubber material and a flexible metal core (10) made of stainless steel corrugated plate or shape memory alloy to enhance fatigue resistance.

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