Steel core ring lock scale buckle type connecting piece

Abstract

The utility model discloses a steel core ring lock scale buckle type connecting piece, it includes inner support guide connecting pipe, elastic packing ring and ring lock steel cover, through ring pressure device makes ring lock steel cover radial shrinkage deformation, and then extrudes the pressure -resistant pipe and elastic packing ring that are all deformed on the inner support guide connecting pipe, and simultaneously scale inner buckle piece is also extruded deformation by ring pressure device and then prickle into pressure -resistant pipe surface, realizes the anti -pulling of butt joint between pressure -resistant pipe port and sealing. The utility model only adopts the deformation of ring lock steel cover to realize the sealing butt joint of pressure -resistant pipe, and through the prickle of scale inner buckle piece into the pressure -resistant pipe surface layer can further enhance the anti -pulling performance, and compared with prior art, the scheme has dispensed with the cost of high cost tightening disc and tightening piece, and in the case of more cost advantage, the anti -pulling performance is further improved.

Description

Technical Field

[0001] This utility model relates to pipe butt connection technology, mainly to the port butt connection technology of plastic composite pressure-resistant pipes that can deform under external pressure, specifically a butt connection structure for the ports of such pipes. Background Technology

[0002] As pressure-resistant pipelines for transmitting high-pressure fluids (oil, gas, water, etc.), plastic composite pressure-resistant pipes are a low-cost mainstream pipe material with corrosion resistance. Common types include plastic-steel wire composite pipes and plastic-fiberglass composite pipes. Plastic composite pipes are made by combining various materials that can enhance the strength of the pipe into plastic to enhance the pressure resistance of the pipe. These composite pipes also have the ability to deform and compress radially under external pressure. This utility model is an innovative connection solution based on the deformation characteristics of such pipes.

[0003] During pipeline construction, on-site connections between pipes are necessary, which involves butt joints between pipe ends. The quality of these joints directly affects the overall pressure resistance and durability of the pipeline. Because the ends of plastic composite pressure-resistant pipes have exposed, unprotected composite layers, contact with high-pressure fluids at these locations can easily damage the pipe structure, impairing its pressure resistance, corrosion resistance, and service life. In practical applications, pipeline leaks often occur at the joints. Furthermore, the ease and detachability of these joints have a direct and crucial impact on the construction cost and efficiency of the pipeline.

[0004] For plastic composite pressure-resistant pipes, one of the traditional splicing techniques is to use electric heating to melt plastic on the construction site to seal the ends of the composite pipes. Then, a plastic sleeve with an electrofusion heating wire on the inner wall is fitted onto the ends of the two pipes. The connection is achieved by electro-welding the inner wall of the plastic sleeve and the outer walls of the two pipes through the electrofusion heating wire. This bonding method exposes the ends of the composite pipes to the high-pressure fluid. The quality of the end seal directly affects the connection quality, and the joint is not reinforced by the composite material. Therefore, this connection method is not suitable for many applications. In addition, using this connection method will make the pipes non-removable.

[0005] The applicant previously disclosed a Chinese utility model patent with publication number CN114542840B, which utilized the force of a tightening disc to directly compress the pressure-resistant tube radially onto the tightening plate, causing deformation of the pressure-resistant tube and sealing ring. This, combined with the internal support guide tube, formed a seal and achieved pull-out resistance. While this solution was very successful in practical application, it suffered from high costs. This was mainly due to the high unit cost of the tightening disc and tightening plate, and the requirement for a complete set for each mating interface, making it difficult to achieve a cost advantage. Based on this, the applicant further explored, researched, and experimented, developing the solution of this application, which can further reduce connection costs while ensuring sealing and pull-out resistance. Utility Model Content

[0006] To address the aforementioned issues, this utility model aims to provide a connector with lower cost and better pull-out resistance for connecting the ports of deformable plastic composite pressure-resistant pipes.

[0007] To achieve this technical objective, the present invention provides a steel-core ring-locking buckle connector for connecting the ports of deformable plastic composite pressure-resistant pipes. The pressure-resistant pipes are used to transport high-pressure fluids, and the outer wall of the pipe at its ports is flat. The connector is characterized by comprising: an inner support guide pipe, which is a thin-walled metal shaped pipe with its maximum outer diameter at both ends matching the inner diameter of the pressure-resistant pipe. This guide pipe can be inserted into the ports of the two connected pressure-resistant pipes for conductive connection between them and for fixing and supporting the elastic sealing rings; and two sets of elastic sealing rings, respectively encircling the left and right ends of the inner support guide pipe for preventing... The high-pressure fluid is prevented from flowing out between the inner wall of the pressure-resistant pipe and the outer wall of the inner support guide pipe. The ring-locking steel sleeve is a thin-walled metal shaped pipe with several scale-like inner buckles on its surface. Its length matches the inner support guide pipe, and the minimum inner diameter at its left and right ends matches the outer diameter of the pressure-resistant pipe. It can be respectively ringed around the two pressure-resistant pipe ports that are connected. The ring-locking steel sleeve is radially contracted and deformed by the ring-pressing device, which in turn squeezes and deforms the pressure-resistant pipe and the elastic sealing ring fitted on the inner support guide pipe. At the same time, the scale-like inner buckles are also squeezed and deformed by the ring-pressing device and then inserted into the surface of the pressure-resistant pipe to achieve pull-out resistance and sealing between the pressure-resistant pipe ports.

[0008] As a further improvement, the central part of the inner support guide tube has an annular limiting protrusion, and the central part of the ring-locking steel sleeve has an annular limiting concave shape; both the left and right ends of the inner support guide tube are provided with concave accommodating grooves for fitting elastic sealing rings, and the maximum outer diameter formed after the elastic sealing ring is fitted into the accommodating groove is smaller than the inner diameter of the pressure-resistant tube; both the left and right ends of the inner support guide tube are also provided with concave tensile-resistant grooves to accommodate the deformation of the pressure-resistant tube and increase pull-out resistance; the ring-locking steel sleeve is ring-pressed at least at the locations corresponding to the accommodating groove and the concave tensile-resistant groove.

[0009] As a further improvement, a number of scale-like inner buckles are arranged on the surface of the ring-locking steel sleeve at least in a ring and evenly distributed in the corresponding positions of the ring groove and the concave tensile ring groove of the ring-locking steel sleeve and the inner support guide tube. The scale-like inner buckles are formed by U-shaped through grooves engraved on the surface of the ring-locking steel sleeve, and the openings formed by the U-shaped through grooves all face the annular limiting concave.

[0010] As a further improvement, the surface of the scale-like inner buckle is provided with an outward convex structure. When squeezed by the ring pressing device, the outward convex structure squeezes the scale-like inner buckle into the surface of the pressure-resistant pipe.

[0011] Preferably, the convex structure is formed by water-expanding protrusions on the surface of the ring-lock steel sleeve.

[0012] Preferably, the convex structure is formed by welding metal parts onto the surface of the ring-lock steel sleeve.

[0013] To better ensure deformation, the ring-locking steel sleeve is constructed with shallow ring grooves corresponding to the accommodating ring groove and the concave tensile ring groove of the inner support guide tube.

[0014] The present invention achieves the sealing connection of the pressure-resistant pipe by only using the deformation of the ring-locking steel sleeve, and further enhances the pull-out resistance by constructing scale-like inner buckling plates that pierce into the surface of the pressure-resistant pipe. Compared with the prior art, this solution eliminates the costly tightening discs and tightening plates, and further improves the pull-out resistance while being more cost-effective. Attached Figure Description

[0015] Figure 1 This is a perspective view of the preferred embodiment of the present invention after docking;

[0016] Figure 2 This is an exploded view of the preferred embodiment of the present invention before docking;

[0017] Figure 3 This is a perspective view of the steel sleeve of the central ring lock in this utility model;

[0018] Figure 4 for Figure 3 Enlarged view of part A in the middle;

[0019] Figure 5 This is a perspective view of the internal support guide tube in this utility model;

[0020] Figure 6 This is an axial sectional view of the preferred embodiment of the present invention before it is ring-pressed after docking;

[0021] Figure 7 This is a perspective view of the preferred ring pressing device involved in this utility model;

[0022] Figure 8 This is an exploded view of the preferred ring compression device involved in this utility model.

[0023] The components include: 1. Ring-locking steel sleeve, 11. Ring-shaped limiting concave part, 12. Scale-shaped inner buckle piece, 121. Outward convex structure, 13. U-shaped through groove, 14. Shallow ring groove, 2. Inner support guide tube, 21. Ring-shaped limiting outward convex part, 22. Tensile ring groove, 23. Receptive ring groove, 3. Elastic sealing ring, 4. Pressure-resistant tube, 5. Ring pressure ring, 6. Ring pressure piece, 7. Clamping bolt. Detailed Implementation

[0024] The present invention will be further described below with reference to the accompanying drawings and embodiments. In the following detailed description, only certain exemplary preferred embodiments of the present invention are described by way of illustration. Undoubtedly, those skilled in the art will recognize that various modifications can be made to the described embodiments without departing from the spirit and scope of the present invention. Therefore, the drawings and description are illustrative in nature and not intended to limit the scope of the claims.

[0025] This utility model relates to a deformable plastic composite pressure-resistant pipe. These pipes are primarily made of plastic, such as PE, PP, or composite plastics. To enhance the mechanical strength of the plastic, high-strength materials (such as steel wire or fiberglass) can be added without increasing the pipe wall thickness, significantly improving the pipe's internal pressure resistance. This allows the plastic pipe to be used in a wider range of high-pressure and corrosion-resistant applications. The outer wall of the pipe's port is flat, meaning that at least a section of the pipe at the docking port has smooth, flat inner and outer walls without corrugations. Pressure resistance refers to the ability of this type of pipe to transport high-pressure fluids, withstand extremely high internal pressure, and possess strong tensile strength, preventing axial cracking due to internal pressure. Deformability refers to the ability of this type of plastic composite pressure-resistant pipe to radially deform and compress under external pressure, exhibiting a degree of flexibility rather than being a completely non-contractile rigid structure. The docking structure of this utility model is an innovative connection solution based on the deformation characteristics of this type of pipe. In other words, this solution is not suitable for rigid pipes that cannot radially deform.

[0026] like Figure 1 , 2 As shown, this utility model discloses a steel core ring-locking buckle connector. The steel core refers to the inner support guide tube 2 of the metal inner core, which is a thin-walled special-shaped metal tube. In the preferred embodiment, it is made of thin-walled stainless steel tube through processes such as pressure expansion or diameter reduction. The maximum outer diameter of its left and right ends matches the inner diameter of the pressure-resistant tube. It can be inserted into the ports of the two pressure-resistant tubes 4 for conductive connection between the pressure-resistant tubes 4. When the high-pressure fluid flows through the docking position, it passes completely through the inner support guide tube 2, so that the docking port of the pressure-resistant tube 4 is completely isolated from the high-pressure fluid, effectively protecting the weak part. The inner support guide tube 2 is also used to fix and support the elastic sealing ring.

[0027] The connector in this solution includes two sets of elastic sealing rings 3, which are respectively wrapped around the left and right ends of the inner support guide tube. Each set of elastic sealing rings can be one or more rings. The elastic sealing rings are mainly used to prevent high pressure fluid from flowing out between the inner wall of the pressure-resistant pipe and the outer wall of the inner support guide tube.

[0028] The connector in this solution also includes a ring-locking steel sleeve 1, such as Figure 3 , 4 As shown, the ring-locking steel sleeve 1 is a thin-walled special-shaped metal tube with several scale-like inner buckle pieces 12 on its surface. Its length matches the inner support guide tube, and its minimum inner diameter at both ends matches the outer diameter of the pressure-resistant tube. It can be ringed around the two pressure-resistant tube ports respectively.

[0029] During assembly, such as Figure 1 , 2 As shown, firstly, two sets of elastic sealing rings 3 are respectively fitted onto the left and right ends of the inner support guide tube 2. Then, one end of the inner support guide tube 2 is inserted into the pressure-resistant tube port of one of the two pressure-resistant tubes 4 that need to be connected. Then, one end of the ring-locking steel sleeve 1 is fitted onto the pressure-resistant tube port. After that, the port of the other pressure-resistant tube is inserted into the other end of the ring-locking steel sleeve 1, and at the same time, the other end of the inner support guide tube 2 is fitted into the tube. After that, the ring-locking steel sleeve 1 is radially contracted and deformed by the ring-pressing device, which in turn squeezes the pressure-resistant tube 4 and the elastic sealing ring 3 fitted on the inner support guide tube 2 to deform. At the same time, the scale-like inner buckle 12 is also squeezed and deformed by the ring-pressing device and then pierced (or can be described as obliquely pierced into) the surface of the pressure-resistant tube 4 to achieve pull-out resistance and sealing between the pressure-resistant tube ports.

[0030] The ring pressing device involved in this solution can be any ring pressing device in the prior art. In the optimal embodiment, a ring pressing device such as... Figure 7 and 8 The structure shown is more convenient for on-site construction as a ring clamping device. It mainly uses the tightening bolt 7 to tighten the ring clamping ring 5, thereby causing the ring clamping plate 6 to squeeze the ring locking steel sleeve 1. The part of the ring clamping plate 6 that contacts the ring locking steel sleeve 1 usually has a certain concave and convex structure, so that a specific part of the ring locking steel sleeve 1 is subjected to pressure and radially shrinks and deforms. These are all existing technologies and can be recognized and implemented by those skilled in the art. They are not the improvement points of this solution, so they will not be elaborated in this solution.

[0031] In a preferred embodiment, to facilitate workers in easily and accurately determining the positions of the interlocking steel sleeve 1 and the inner support guide tube 2 inserted into the pressure-resistant pipe 4 during construction, an annular limiting protrusion 21 is constructed at the center of the inner support guide tube 2. The maximum outer diameter of this limiting protrusion is greater than the inner diameter of the docking port of the pressure-resistant pipe 4. The center of the interlocking steel sleeve 1 has an annular limiting concave portion 11, the minimum inner diameter of which is smaller than the outer diameter of the docking port of the pressure-resistant pipe 4. Thus, during operation, workers only need to insert either side of the inner support guide tube 2 or the interlocking steel sleeve 1 into the port of the pressure-resistant pipe until it is stopped, greatly facilitating accurate positioning during construction.

[0032] Both ends of the inner support guide tube 2 are provided with concave ring grooves 23 for fitting the elastic sealing ring 3. The maximum outer diameter formed after the elastic sealing ring 3 is fitted into the ring groove 23 is smaller than the inner diameter of the pressure-resistant tube. This allows the fitted elastic sealing ring 3 to be smoothly inserted into the tube from the pressure-resistant tube port, preventing the elastic sealing ring 3 from being blocked or scratched by the pressure-resistant tube port. This protects the elastic sealing ring from damage. The pressure sealing of the elastic sealing ring is completed entirely during the later pressure deformation. The left and right ends of the inner support guide tube 2 are also provided with concave tensile ring grooves 22 to cooperate with the deformation of the pressure-resistant tube to increase the pull-out resistance. When the pressure-resistant tube is compressed and deformed by the ring-locked steel sleeve 1, the pressure-resistant tube is also compressed, and then this part of the pressure-resistant tube is squeezed into the concave tensile ring groove 22, increasing the interaction force between the pressure-resistant tube 4 and the inner support guide tube 2, and greatly improving the pull-out resistance. Based on the above, the ring-locked steel sleeve 1 is compressed at least at the part corresponding to the ring groove 23 and the concave tensile ring groove 22.

[0033] For better construction convenience, in the preferred embodiment, a plurality of scale-like inner buckles 12 formed on the surface of the ring-locking steel sleeve 1 are at least evenly distributed in a ring shape at the corresponding positions of the accommodating annular groove 23 and the concave tensile ring groove 22 of the ring-locking steel sleeve 1 and the inner support guide tube 2. This allows the ring pressing to simultaneously achieve the diameter reduction deformation and the insertion of the scale-like inner buckles 12, eliminating the need for separate pressing of the scale-like inner buckles 12. In addition, the scale-like inner buckles 12 are formed by U-shaped through grooves engraved on the surface of the ring-locking steel sleeve 1. More importantly, the openings formed by the U-shaped through grooves all face the annular limiting concave 11, that is, as shown in the figure. Figure 3 As shown, the scaly inner buckle 12 is inserted into the pressure-resistant tube at one end, always facing the annular limiting recess 11. This makes the direction of the scaly inner buckle 12 inserted into the pressure-resistant tube surface opposite to the direction of separating the two mating pressure-resistant tubes, achieving the effect of barbed pull-out resistance and greatly enhancing the pull-out resistance of the connection.

[0034] As a further improvement, the surface of the scale-shaped inner buckle 12 is provided with an outwardly protruding structure 121. When the ring-locking steel sleeve 1 is squeezed by the ring-pressing device, because the outwardly protruding structure 121 protrudes from the surface of the ring-locking steel sleeve 1, the scale-shaped inner buckle 12 is more easily compressed, which in turn makes it easier for the scale-shaped inner buckle 12 to penetrate the surface of the pressure-resistant pipe 4. Preferably, the outwardly protruding structure 121 can be formed by water expansion protrusion on the surface of the ring-locking steel sleeve 1; or it can be formed by welding a metal part to the surface of the ring-locking steel sleeve 1.

[0035] To better ensure deformation, such as Figure 3 , 6 As shown, the portion of the ring-locking steel sleeve 1 corresponding to the accommodating ring groove 23 and the concave tensile ring groove 22 of the inner support guide tube is configured as a shallow ring groove 14; this shallow ring groove is a shallow diameter reduction pre-constructed on the ring-locking steel sleeve 1; the function of the shallow ring groove 14 is twofold: first, it facilitates the worker to accurately position the ring pressing device; second, it guides the deformation of the locking ring steel sleeve at this part during ring pressing, which is beneficial for the diameter reduction of the ring-locking steel sleeve 1 to better compress the pressure-resistant tube.

[0036] The foregoing has shown and described the basic principles, main features, and advantages of this utility model. Those skilled in the art should understand that this utility model is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of this utility model. Various changes and modifications can be made to this utility model without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claims. The scope of protection of this utility model is defined by the appended claims and their equivalents.

Claims

1. A steel core ring locking buckle connector for connecting the ports of a deformable plastic composite pressure-resistant pipe, wherein the pressure-resistant pipe can be used to transport high-pressure fluids and the outer wall of the pipe at its port is a flat wall, characterized in that... include: The inner support guide tube is a thin-walled metal shaped tube. Its maximum outer diameter at both ends matches the inner diameter of the pressure-resistant tube. It can be inserted into the two pressure-resistant tubes for conductive connection between the pressure-resistant tubes, and is also used to fix and support the elastic sealing ring. Two sets of elastic sealing rings are respectively fitted around the left and right ends of the inner support guide tube to prevent high-pressure fluid from flowing out between the inner wall of the pressure-resistant tube and the outer wall of the inner support guide tube; The ring-locking steel sleeve is a thin-walled special-shaped metal tube with several scale-like inner buckles on its surface. Its length matches the inner support guide tube, and its minimum inner diameter at both ends matches the outer diameter of the pressure-resistant tube. It can be ringed around the two pressure-resistant tube ports that are connected. The ring compression device causes the ring-lock steel sleeve to shrink and deform radially, which in turn squeezes and deforms the pressure-resistant pipe and elastic sealing ring fitted on the inner support guide pipe. At the same time, the scale-like inner buckle is also squeezed and deformed by the ring compression device and then inserted into the surface of the pressure-resistant pipe to achieve pull-out resistance and sealing between the pressure-resistant pipe ports.

2. The steel core ring locking fastener according to claim 1, characterized in that, The inner support guide tube has an annular limiting protrusion at its center, and the ring-locking steel sleeve has an annular limiting concave at its center. Both the left and right ends of the inner support guide tube are provided with concave accommodating grooves for fitting elastic sealing rings. The maximum outer diameter formed by the elastic sealing ring after being fitted into the accommodating groove is smaller than the inner diameter of the pressure-resistant tube. Both the left and right ends of the inner support guide tube are also provided with concave tensile-resistant grooves to accommodate the deformation of the pressure-resistant tube and increase pull-out resistance. The ring-locking steel sleeve is ring-pressed at least at the locations corresponding to the accommodating groove and the concave tensile-resistant groove.

3. The steel core ring locking fastener according to claim 2, characterized in that, The scale-like inner buckles on the surface of the ring-locking steel sleeve are at least evenly distributed in a ring at the corresponding positions of the ring groove and the concave tensile ring groove of the ring-locking steel sleeve and the inner support guide tube. The scale-like inner buckles are formed by U-shaped through grooves engraved on the surface of the ring-locking steel sleeve, and the openings formed by the U-shaped through grooves all face the annular limiting concave.

4. The steel core ring locking fastener according to claim 3, characterized in that, The surface of the scale-shaped inner buckle is provided with an outward convex structure. When squeezed by the ring pressing device, the outward convex structure squeezes the scale-shaped inner buckle into the surface of the pressure-resistant pipe.

5. The steel core ring locking fastener according to claim 4, characterized in that, The convex structure is formed by water-expanding protrusions on the surface of the ring-lock steel sleeve.

6. The steel core ring locking fastener according to claim 4, characterized in that, The convex structure is formed by welding metal parts onto the surface of the ring-lock steel sleeve.

7. The steel core ring locking fastener according to any one of claims 1-6, characterized in that, The ring-locking steel sleeve is configured with a shallow ring groove corresponding to the accommodating ring groove and the concave tensile ring groove of the inner support guide tube.

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