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CN-224229477-U - Large-caliber water supply pipeline interface sealing structure

CN224229477UCN 224229477 UCN224229477 UCN 224229477UCN-224229477-U

Abstract

The utility model belongs to the technical field of pipeline sealing, and particularly relates to a large-caliber water supply pipeline joint sealing structure, which comprises a sealing piece, an axial pressing piece, a buffering anti-sinking assembly, a rigid constraint unit and a connecting unit, wherein the sealing piece is arranged between a first pipeline joint end and a second pipeline joint end which is coaxially and oppositely arranged, the axial pressing piece is arranged in a connecting area of the first pipeline and the second pipeline, the buffering anti-sinking assembly comprises a flexible buffer unit and is used for generating elastic deformation to adapt to a height difference when the pipelines are unevenly settled, the rigid constraint unit is used for applying rigid constraint force to the pipelines when the settlement exceeds a preset threshold value, the connecting unit is used for fixing the flexible buffer unit and the rigid constraint unit to the pipelines, and when any pipeline is unevenly settled, tensile force opposite to the settlement direction is applied to the settlement pipelines through elastic deformation of the flexible buffer unit and rigid constraint synergistic effect of the rigid constraint unit, so that the relative height difference of the end faces of the two pipeline joints is limited, sealing failure is avoided, and the operation reliability of the pipelines under complex geological conditions is remarkably improved.

Inventors

  • LIU NA
  • HAN SHUTING
  • ZHANG WEIHUA
  • SUN YUAN
  • ZHOU XIAN
  • AN LIPING

Assignees

  • 日照市兴源水务有限公司

Dates

Publication Date
20260512
Application Date
20250625

Claims (6)

  1. 1. A large caliber water supply pipe joint sealing structure, comprising: The sealing piece (1) is arranged between the interface end of the first pipeline (2) and the interface end of the second pipeline (3) which is coaxially and oppositely arranged, and the sealing piece (1) fills a gap between the interface end surfaces of the two pipelines through elastic deformation so as to realize radial sealing; The axial compression piece (4) is arranged in the connecting area of the first pipeline (2) and the second pipeline (3), and the axial compression piece (4) applies axial pre-tightening force to the end faces of the joint of the two pipelines through mechanical fastening, so that the sealing piece (1) is elastically compressed and keeps continuous sealing pressure; The device is characterized by further comprising a buffering anti-sinking assembly (5) which is detachably connected between the first pipeline (2) and the second pipeline (3), and comprises: A flexible buffer unit (6) for generating elastic deformation to adapt to the height difference when the pipe is unevenly settled; A rigid constraint unit (7) for applying a rigid constraint force to the pipeline when the sedimentation exceeds a preset threshold; -a connection unit (8) for fixing the flexible buffer unit (6) and the rigid constraint unit (7) to the duct; The buffering anti-sinking assembly (5) is configured to apply pulling force opposite to the sinking direction to the sinking pipeline through the cooperation of elastic deformation of the flexible buffering unit (6) and rigid constraint of the rigid constraint unit (7) when uneven sinking occurs to any pipeline so as to limit the relative height difference of the end faces of the two pipeline interfaces.
  2. 2. The large-caliber water supply pipeline interface sealing structure according to claim 1, wherein the buffer anti-sinking assemblies (5) are arranged in two groups and symmetrically arranged at two sides of a pipeline connecting area, and each group of buffer anti-sinking assemblies (5) comprises: The flexible buffer unit (6) comprises a semicircular arc-shaped elastic plate (9) and a flexible metal inner core (10) embedded in the elastic plate (9), wherein the elastic plate (9) generates elastic deformation when a pipeline is unevenly settled, and the flexible metal inner core (10) is used for enhancing the fatigue resistance of the elastic plate (9); The rigid constraint unit (7) comprises a semicircular arc-shaped fixed shell (11) with a hollow inside, a transition plate (12) in sliding connection with the fixed shell (11), and an elastic connecting piece (13) which is arranged between the fixed shell (11) and the transition plate (12) and is used for providing elastic buffering at the initial stage of sedimentation; The connecting unit (8) comprises two groups of annular brackets (14) and a limiting clamping plate (15), wherein the annular brackets (14) are respectively fixed on the flexible buffer unit (6) and the rigid constraint unit (7), and the limiting clamping plate (15) is fixed on the outer wall of the pipeline and axially limits the annular brackets (14); Wherein, the annular brackets (14) of the two groups of buffering anti-sinking components (5) are connected through bolts to form an integral constraint structure.
  3. 3. A large diameter water supply pipe joint sealing structure according to claim 1, wherein the sealing member (1) comprises: The sealing grooves (16) are respectively arranged on the end faces of the interfaces of the first pipeline (2) and the second pipeline (3), and the two sealing grooves (16) form a sealing cavity when the pipelines are in butt joint; The sealing ring (17) is arranged in the sealing cavity, the sealing ring (17) and the sealing cavity are in interference fit at a first temperature, and the temperature value corresponding to the first temperature is not more than the temperature value corresponding to the lowest temperature of the pipeline in the installation and use environment.
  4. 4. A large diameter water supply pipe joint sealing structure according to claim 2, wherein the length of the transition plate (12) extending to the inside of the fixed housing (11) is one third of the axial length of the seal ring (17).
  5. 5. The large-caliber water supply pipeline interface sealing structure according to claim 1, wherein the connecting piece of the axial pressing piece (4) is two annular connecting plates (18) and a high-strength bolt group (19), the two annular connecting plates (18) are fixed at two pipeline interface ends through welding, and the high-strength bolt group (19) is uniformly distributed along the pipeline circumference.
  6. 6. The large-caliber water supply pipeline interface sealing structure according to claim 2, wherein the elastic plate (9) of the flexible buffer unit (6) is made of modified rubber materials, and the flexible metal inner core (10) is made of stainless steel corrugated plates or memory alloy so as to enhance fatigue resistance.

Description

Large-caliber water supply pipeline interface sealing structure Technical Field The utility model belongs to the technical field of pipeline sealing, and particularly relates to a large-caliber water supply pipeline interface sealing structure. Background With the acceleration of the urban process and the expansion of the large-distance water delivery engineering scale, the large-caliber (DN is more than or equal to 1000) water supply pipelines are increasingly commonly applied under complex geological conditions (such as soft soil foundations, filled areas, seismic zones and the like). However, the conventional interface sealing structure has the following technical defects when dealing with high-pressure working conditions, thermal expansion and shrinkage and differential settlement: 1. differential settlement adaptability is poor: In the area of insufficient bearing capacity of the soil, the pipeline is easy to generate uneven settlement (for example, the relative height difference delta h of the end faces of the two pipe joints is more than or equal to 5 mm), the traditional rigid flange connection can not actively compensate settlement deformation, so that the sealing ring is locally pressed unevenly or separated from the sealing groove, and leakage is caused. 2. Insufficient pressure resistance and scouring resistance: The pressure of a large-caliber pipeline conveying medium is high (usually more than or equal to 1.6 MPa), the flow speed is high (more than or equal to 2 m/s), the traditional single rubber sealing ring is easy to generate fatigue cracking under high-pressure water flow flushing, and the elastic modulus is obviously changed under high-temperature or low-temperature working conditions, so that the sealing is invalid. Disclosure of utility model The utility model aims to solve the problems in the prior art by providing a large-caliber water supply pipeline interface sealing structure. The utility model provides a large-caliber water supply pipeline joint sealing structure which comprises a sealing piece, an axial pressing piece, a buffering anti-sinking component and a rigid constraint unit, wherein the sealing piece is arranged between a first pipeline joint end and a second pipeline joint end which is coaxially and oppositely arranged, the sealing piece fills a gap between two pipeline joint end surfaces through elastic deformation to realize radial sealing, the axial pressing piece is arranged in a connecting area of the first pipeline and the second pipeline, the axial pressing piece applies axial pretightening force to the two pipeline joint end surfaces through mechanical fastening to enable the sealing piece to generate elastic compression and keep continuous sealing pressure, the buffering anti-sinking component is detachably connected between the first pipeline and the second pipeline and comprises a flexible buffering unit used for generating elastic deformation to adapt to a height difference when the pipelines sink unevenly, the rigid constraint unit is used for applying rigid constraint force to the pipelines when the sinking is beyond a preset threshold value, the connecting unit is used for fixing the flexible buffering unit and the rigid constraint unit to the pipelines, and the buffering anti-sinking component is configured to apply a synergistic effect of elastic deformation of the flexible buffering unit and rigid constraint unit to the rigid constraint of the two pipeline joint end surfaces when any pipeline sink unevenly, and the tensile force opposite to the sinking direction of the two pipeline joint height difference is limited. The buffer anti-sinking assembly comprises two groups, a rigid constraint unit and a connection unit, wherein the buffer anti-sinking assembly is symmetrically arranged at two sides of a pipeline connection area, each group of buffer anti-sinking assembly comprises a flexible buffer unit, the flexible buffer unit comprises a semicircular arc-shaped elastic plate and a flexible metal inner core embedded in the elastic plate, the elastic plate generates elastic deformation when the pipeline is unevenly sinking, the flexible metal inner core is used for enhancing the fatigue resistance of the elastic plate, the rigid constraint unit comprises a semicircular arc-shaped fixed shell, a transition plate which is slidably connected with the fixed shell, and an elastic connection piece which is arranged between the fixed shell and the transition plate and is used for providing elastic buffer at the initial stage of sinking, the connection unit comprises two groups of annular brackets and a limiting clamping plate, the annular brackets are respectively fixed on the flexible buffer unit and the rigid constraint unit, and the limiting clamping plate is fixed on the outer wall of the pipeline and axially limits the annular brackets, and the annular brackets of the two groups of buffer anti-sinking assemblies are connected through bolts to form an integ