A full self-anchored flexible connection stainless steel composite pipe

Abstract

The present application relates to a kind of full self-anchor flexible connection stainless steel composite pipe, belong to full self-anchor steel pipe technical field, by introducing adaptive dynamic compensation structure, the structure when the extrusion stress that rubber ring bears exceeds preset threshold, by the linkage cooperation of sliding part and spring movable part, realize the collaborative action of axial displacement compensation and elastic pre-tightening force, dynamically maintain the extrusion stress of rubber ring in reasonable range, in this way, not only can keep sealing effect when rubber ring is deformed due to aging or wear, but also can respond to the thermal energy generated by water flow and pipe wall friction and the pressure fluctuation caused by environmental temperature change, this design avoids the extrusion stress that rubber ring bears due to the increase of internal pressure exceeds design value, thereby reducing stress concentration and structure fatigue, prolong the service life of rubber ring, and reduce the maintenance cost and replacement cycle of long distance buried pipeline, effectively solve the vicious cycle problem of shortening the service life of existing structure rubber ring.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of full self-anchored steel pipe, and particularly relates to a full self-anchored flexible connection stainless steel composite steel pipe. BACKGROUND

[0002] The full self-anchored flexible connection stainless steel composite steel pipe used in long-distance water diversion projects needs to meet the special working condition requirements of resisting uneven settlement of the foundation, resisting earthquakes and resisting uplift bearing. The connection system thereof is composed of a butt joint socket, a socket and a rubber ring and a limiting boss therebetween. When installed, a reasonable assembly gap is reserved to avoid excessive deformation of the rubber ring.

[0003] However, in actual operation, multiple factors superimpose to cause the sealing system to accelerate failure. First, the rubber ring is gradually contracted due to the influence of long-term water flow scouring and aging, which weakens the initial sealing effect. Second, the continuous friction between the water flow and the pipe wall accumulates energy loss with the increase of the distance, and the kinetic energy is converted into heat energy to cause the local water temperature to rise. At the same time, the thermal expansion and contraction of the water body caused by the change of the environmental temperature causes the water body to expand and generate outward expansion pressure when the temperature rises, and a negative pressure may be formed when the temperature decreases. This dynamic pressure fluctuation significantly increases the internal pressure of the pipeline. More seriously, the increased internal pressure forces the already contracted and aged rubber ring to bear extrusion stress far exceeding the design value, causing stress concentration at the sealing interface, accelerating the structural fatigue and permanent deformation of the rubber ring. The concealment of the long-distance buried pipeline and the complexity of the construction make the operation cost of replacing the damaged rubber ring high and the cycle long. Therefore, the service life of the rubber ring of the existing structure is dramatically shortened under the combined action of multiple pressures, and it is urgent to design a new type of full self-anchored flexible connection stainless steel composite steel pipe to solve this vicious circle problem. SUMMARY

[0004] To solve the above problems in the prior art, the present application provides a full self-anchored flexible connection stainless steel composite steel pipe, which solves the problems in the background art.

[0005] The object of the present application can be achieved by the following technical solutions.

[0006] A full self-anchored flexible connection stainless steel composite steel pipe, comprising a plurality of steel pipe bodies and a rubber ring, the two ends of the steel pipe body form a socket and a socket respectively, the rubber ring is sealingly arranged at the joint of the socket and the socket, and a sliding part and a spring movable part are correspondingly arranged on the mating surfaces of the socket end and the socket end, the sliding part and the spring movable part constitute a self-adaptive dynamic compensation structure, when the rubber ring is deformed due to wear or aging, the sliding part and the spring movable part trigger linkage cooperation based on a preset displacement threshold, through the synergistic effect of axial displacement compensation and elastic pre-tightening force, the extrusion stress borne by the rubber ring is dynamically maintained within a preset threshold range, preventing overload failure caused by extrusion pressure fluctuation.

[0007] As a further scheme of the present application, the spring movable part comprises a locating seat arranged at the socket end, a first limiting rod arranged in the locating seat in the axial direction, a movable rod arranged in parallel with the first limiting rod, a compression spring connecting the first limiting rod and the movable rod, and a rotary limiting mechanism; the rotary limiting mechanism comprises a U-shaped limiting block, one end of the U-shaped limiting block is hinged to the locating seat through a rotating shaft, and the other end of the U-shaped limiting block forms an arc-shaped protrusion for clamping the sliding part; the movable rod drives the U-shaped limiting block to rotate around the rotating shaft under the action of the compression spring, so as to realize dynamic adjustment of the locking force of the sliding part and the spring movable part.

[0008] As a further scheme of the present application, the sliding part is a sliding block provided with a wedge-shaped guide surface, a locking groove matched with the arc-shaped protrusion is arranged in the side wall of the sliding block, and the end of the U-shaped limiting block close to the movable rod is provided with an arc-shaped abutting surface matched with the profile of the side wall of the sliding block.

[0009] As a further scheme of the present application, the first limiting rod is extended to form a tapered guide head at the end, the tapered guide head is inserted into a tapered slot arranged in the side wall of the sliding block to form an insertion fit, and is used for limiting the transverse displacement of the sliding block.

[0010] As a further scheme of the present application, the pre-tightening force of the compression spring is positively correlated with the design internal pressure of the pipeline, when the compression amount of the rubber ring reaches a threshold value, the displacement of the movable rod triggers the rotation of the U-shaped limiting block, so that the arc-shaped protrusion and the locking groove form a progressive locking, and the self-balancing of the sealing pressure is realized.

[0011] As a further scheme of the present application, a wave-shaped anti-skid pattern is arranged between the wedge-shaped guide surface of the sliding block and the arc-shaped abutting surface of the U-shaped limiting block.

[0012] As a further scheme of the present application, the rubber ring adopts a multi-layer composite structure, comprising an outer wear-resistant rubber layer, a middle nano-enhanced layer and an inner elastic compensation layer.

[0013] As a further scheme of the present application, the locating seat adopts a detachable mounting structure, the bottom of the locating seat is provided with a dovetail groove, the socket end is provided with a dovetail guide rail, the dovetail groove and the dovetail guide rail arranged at the socket end are in sliding fit, and are fixed through locking bolts.

[0014] As a further scheme of the present application, the connecting part of the socket and the socket is also provided with an auxiliary sealing structure, the auxiliary sealing structure comprises an annular sealing groove and a water-swelling waterstop filled in the annular sealing groove.

[0015] The present application has the following beneficial effects:

[0016] By introducing the adaptive dynamic compensation structure, the shrinkage problem of the rubber ring caused by long-term water flow erosion and aging is effectively solved. When the extrusion stress borne by the rubber ring exceeds the preset threshold, through the linkage cooperation of the sliding part and the spring movable part, the axial displacement compensation and the elastic pre-tightening force are realized, and the extrusion stress of the rubber ring is dynamically maintained within a reasonable range. In this way, not only the sealing effect can be maintained when the rubber ring deforms due to aging or wear, but also the pressure fluctuations caused by the heat energy generated by the friction between the water flow and the pipe wall and the change of the environmental temperature can be coped with. This design avoids the rubber ring bearing extrusion stress exceeding the design value due to the increase of the internal pressure, thereby reducing stress concentration and structural fatigue, prolonging the service life of the rubber ring, reducing the maintenance cost and replacement cycle of the long-distance buried pipeline, and effectively solving the vicious cycle problem of the shortening of the service life of the existing structure rubber ring. BRIEF DESCRIPTION OF DRAWINGS

[0017] In order to facilitate the understanding of those skilled in the art, the present application will be further described below with reference to the accompanying drawings.

[0018] Figure 1 is a schematic diagram of the overall structure of the present application;

[0019] Figure 2 is a state diagram of the initial installation of the rubber ring of the present application;

[0020] Figure 3 is a state diagram of the deformation of the rubber ring caused by wear or aging of the present application;

[0021] Figure 4 is a state diagram of the deformation of the rubber ring caused by wear or aging of the present application; Figure 2 is an enlarged view of A in the present application.

[0022] Main element symbol explanation:

[0023] In the figure: 1, steel pipe body; 2, boss; 3, round snap ring; 4, hook; 5, socket; 6, spigot; 7, rubber ring; 8, sliding part; 81, sliding block; 82, locking groove; 83, tapered slot; 9, spring movable part; 91, positioning seat; 92, first limiting rod; 93, movable rod; 94, compression spring; 95, rotary limiting mechanism. DETAILED DESCRIPTION

[0024] In order to further illustrate the technical means and effects adopted by the present application to achieve the predetermined invention purpose, the specific embodiments, structures, features and effects according to the present application are described in detail below in combination with the preferred embodiments and the drawings.

[0025] Please refer to Figure 1 - Figure 4The embodiment provides a full self-anchor flexible connection stainless steel composite pipe, which comprises a plurality of pipe bodies 1 and rubber rings 7, the two ends of the pipe body 1 are formed with sockets 5 and sockets 6 respectively, the rubber ring 7 is sealingly arranged at the joint of the socket 5 and the socket 6, and sliding parts 8 and spring movable parts 9 are correspondingly arranged on the fitting surfaces of the socket 5 end and the socket 6 end, the sliding part 8 and the spring movable part 9 constitute a self-adapting dynamic compensation structure, when the rubber ring 7 is deformed due to wear or aging, the sliding part 8 and the spring movable part 9 are triggered to cooperate based on a preset displacement threshold, through the synergistic effect of axial displacement compensation and elastic pre-tightening force, the extrusion stress borne by the rubber ring 7 is dynamically maintained within a preset threshold range, and overloading failure caused by extrusion pressure fluctuation is prevented, wherein, in addition to the socket 5, the socket 6 and the rubber ring 7, the existing butt joint pipe interface also comprises a circular clasp 3, a hook 4 and a boss 2, during installation, the sealing rubber ring is only needed to be installed on the socket 6, the socket 6 is inserted into the socket 5, and then the circular clasp 3 is pushed into the space between the boss 2 and the hook 4, and the circular clasp 3 is expanded and attached in the hook 4 through radial rebound deformation, so that the installation is completed, and details are not described here, as shown in Figure 1 .

[0026] At present, the full self-anchor flexible connection stainless steel composite pipe used in long-distance water diversion projects needs to meet the special working condition requirements of resisting uneven settlement of the foundation, resisting earthquakes and resisting uplift bearing. The connection system is composed of a specific shape of a butt joint socket 6, a socket 5 and a rubber ring 7 and a limiting boss 2 between the butt joint socket 6 and the socket 5. During installation, a reasonable assembly gap is reserved to avoid excessive deformation of the rubber ring 7. However, in actual operation, multiple factors superimpose to cause the sealing system to fail rapidly. First, the rubber ring 7 will gradually shrink under the influence of long-term water flow erosion and aging, weakening the initial sealing effect. Second, the continuous friction between the water flow and the pipe wall accumulates energy loss with the increase of the distance, and the kinetic energy is converted into heat energy, causing the local water temperature to rise. At the same time, the thermal expansion and contraction of the water body caused by the change of the environmental temperature causes the water body to expand and produce outward expansion pressure when the temperature rises, and negative pressure may be formed when the temperature decreases. This dynamic pressure fluctuation significantly increases the internal pressure of the pipeline. More seriously, the increased internal pressure forces the already shrunk and aged rubber ring 7 to bear extrusion stress far exceeding the design value, causing stress concentration at the sealing interface, accelerating the structural fatigue and permanent deformation of the rubber ring 7. The concealment of the long-distance buried pipeline and the complexity of the construction make the operation cost of replacing the damaged rubber ring 7 high and the period long. Therefore, the service life of the rubber ring 7 of the existing structure is sharply shortened under the combined action of multiple pressures.

[0027] In the above background, in order to solve the above problems, in the present embodiment, by introducing an adaptive dynamic compensation structure, the shrinkage problem of the rubber ring 7 caused by long-term water flow erosion and aging is effectively solved. When the extrusion stress borne by the rubber ring 7 exceeds the preset threshold, through the linkage cooperation of the sliding part 8 and the spring movable part 9, the axial displacement compensation and the elastic pre-tightening force are realized, and the extrusion stress of the rubber ring 7 is dynamically maintained within a reasonable range. In this way, not only can the sealing effect be maintained when the rubber ring 7 is deformed due to aging or wear, but also the pressure fluctuations caused by the heat generated by the friction between the water flow and the pipe wall and the change of the environmental temperature can be coped with. This design avoids the situation that the rubber ring 7 bears extrusion stress exceeding the design value due to the increase of the internal pressure, thereby reducing stress concentration and structural fatigue, prolonging the service life of the rubber ring 7, and reducing the maintenance cost and replacement cycle of the long-distance buried pipeline, effectively solving the vicious cycle problem of the short service life of the existing structure rubber ring 7.

[0028] In order to better avoid the situation that the internal pressure fluctuation forces the rubber ring 7 to bear the extrusion stress exceeding the design value, leading to fatigue failure, in an embodiment, the spring movable part 9 comprises a positioning seat 91 arranged at the end of the socket 6, a first limiting rod 92 arranged in the positioning seat 91 in the axial direction, a movable rod 93 arranged parallel to the first limiting rod 92, a compression spring 94 connecting the first limiting rod 92 and the movable rod 93, and a rotary limiting mechanism 95; the rotary limiting mechanism 95 comprises a U-shaped limiting block, one end of the U-shaped limiting block is hinged to the positioning seat 91 through a rotating shaft, and the other end of the U-shaped limiting block forms an arc-shaped protrusion for clamping the sliding block 81; the movable rod 93 drives the U-shaped limiting block to rotate around the rotating shaft under the action of the compression spring 94, realizing dynamic adjustment of the locking force of the sliding part 8 and the spring movable part 9. The spring movable part 9 is positively related to the internal pressure of the pipeline through the pre-tightening force of the compression spring 94. When the internal pressure rises, the spring pre-tightening force is simultaneously enhanced, pushing the U-shaped limiting block to rotate and lock the sliding block 81, forming a progressive pressure balance, avoiding overload caused by sudden pressure change, and realizing self-adjustment of the sealing pressure.

[0029] Since the pipeline in the long-distance water diversion project may vibrate due to factors such as water flow impact, water pump operation, earthquake or wind force, these vibrations will continuously act on the screw connection, causing the screw to gradually loosen, thereby affecting the locking effect. In order to avoid this problem, in an embodiment, the sliding part 8 is a sliding block 81 provided with a wedge-shaped guide surface, the sliding block 81 is provided with a locking groove 82 matched with the arc-shaped protrusion on the side wall, the end of the U-shaped limiting block close to the movable rod 93 is provided with an arc-shaped fitting surface matched with the profile of the side wall of the sliding block 81, the wedge-shaped guide surface and the arc-shaped protrusion form a geometric self-locking, and the conical insertion groove 83 limits the transverse displacement, ensuring that the compensation action is accurate and controllable. Since the arc-shaped fitting surface and the locking groove 82 are adopted, even in the case of wear, the locking function of the system will not degrade, thereby ensuring the stability of long-term use.

[0030] Furthermore, in long-distance water diversion projects, the internal pressure of the pipeline can change due to various factors such as terrain and climate, and the internal structure of the pipeline is more prone to instability. To address this, in an embodiment, the first limiting rod 92 has a tapered guide head at its end, which forms a plug-in fit with the tapered slot 83 opened on the side wall of the sliding block 81, used to limit the lateral displacement of the sliding block 81, effectively limiting the lateral displacement of the sliding block 81 in the pipeline, ensuring the stability of the internal structure of the pipeline. The pre-tightening force of the compression spring 94 is positively correlated with the design internal pressure of the pipeline. When the compression amount of the rubber ring 7 reaches a threshold value, the displacement of the movable rod 93 triggers the rotation of the U-shaped limiting block, causing the arc-shaped protrusion to form a gradual locking with the locking groove 82, achieving self-balancing of the sealing pressure, so that the sealing pressure can be automatically adjusted according to the change of the internal pressure of the pipeline, avoiding poor sealing or excessive compression caused by internal pressure fluctuations. Through the gradual locking mechanism, the self-balancing of the sealing pressure is ensured, the sealing performance is improved, and the leakage of water resources is effectively prevented.

[0031] Based on the above embodiment, in the process of long-distance water diversion, due to the scouring action of water flow, the friction between the sliding block 81 and the U-shaped limiting block may decrease, causing the sliding block 81 to slip when sliding in the U-shaped limiting block, and long-term sliding friction may cause wear on the surface of the sliding block 81 and the U-shaped limiting block, affecting their normal operation and sealing effect. To address this, in an embodiment, a wave-shaped anti-skid pattern is provided between the wedge-shaped guide surface of the sliding block 81 and the arc-shaped fitting surface of the U-shaped limiting block, which can increase the friction between the sliding block 81 and the U-shaped limiting block, reduce the wear rate, reduce the phenomenon of slipping, and ensure the stability and safety of the water diversion project.

[0032] In actual use, in long-distance water diversion projects, the rubber ring 7 needs to withstand water pressure, water flow scouring, and chemical corrosion for a long time, which can easily cause wear and aging, leading to a decrease in sealing performance. To address this, in an embodiment, the rubber ring 7 adopts a multi-layer composite structure, including an outer wear-resistant rubber layer, an intermediate nano-enhanced layer, and an inner elastic compensation layer. The outer wear-resistant rubber layer can effectively resist water flow scouring and chemical corrosion, improving the durability of the rubber ring 7. The intermediate nano-enhanced layer enhances the mechanical strength and durability of the rubber ring 7. The inner elastic compensation layer ensures that the rubber ring 7 maintains good elasticity and sealing performance when compressed. This design can prolong the service life of the rubber ring 7, reduce the frequency of maintenance and replacement, and reduce the operating cost of long-distance water diversion projects.

[0033] Further, in long-distance water diversion projects, it is necessary to regularly check and maintain the spring or the limiting block and other components, and due to the difficulty in maintaining the long-distance water diversion project itself, in order to make the maintenance relatively simple and reduce the maintenance cost and time, in an embodiment, the positioning seat 91 adopts a detachable mounting structure, the bottom of the positioning seat 91 is provided with a dovetail groove, the end of the spigot 6 is provided with a dovetail guide rail, the dovetail groove and the dovetail guide rail provided at the end of the spigot 6 are in sliding fit, and are fixed through locking bolts. The dovetail groove guide rail and the locking bolt realize quick disassembly and assembly of the positioning seat 91, which is convenient for replacing the spring or the limiting block on site; the sliding fit of the dovetail groove and the dovetail guide rail, combined with the locking bolt, realizes quick disassembly and assembly, facilitates replacement of the spring or the limiting block on site, improves the maintenance efficiency, simplifies the maintenance process, and improves the reliability and economy of the project.

[0034] In addition, in order to provide better backup sealing measures and avoid leakage affecting the normal operation of the project, in an embodiment, the connection between the bell mouth 5 and the spigot 6 is also provided with an auxiliary sealing structure, and the auxiliary sealing structure includes an annular sealing groove and a water-swelling sealing strip filled therein. When the rubber ring 7 fails, there is a lack of backup sealing, which can easily cause a leakage accident. The annular sealing groove is pre-provided with a water-swelling material as an emergency sealing layer. The water-swelling sealing strip in the annular sealing groove can provide additional sealing effect when the rubber ring 7 fails, thereby enhancing the safety and reliability of the system, providing additional protection for possible leakage, and reducing potential problems.

[0035] Working principle and use process of the application:

[0036] The application introduces a self-adaptive dynamic compensation structure. When the rubber ring 7 shrinks due to aging or the internal pressure fluctuates, the sliding part 8 and the spring movable part 9 are triggered to link based on a preset displacement threshold value. The spring pre-tightening force drives the U-shaped limiting block to rotate and drives the sliding block 81 to move axially in real time to fill the sealing gap caused by the shrinkage of the rubber ring 7, and the taper insertion groove 83 and the wavy anti-skid pattern ensure the accuracy and stability of the compensation action, so that the extrusion stress of the rubber ring 7 is always dynamically maintained within a safe threshold value, avoiding stress concentration and overload failure caused by gap expansion or pressure sudden change. The spring pre-tightening force is positively related to the internal pressure of the pipeline. When the temperature rises or the water flow impact causes the internal pressure to increase, the spring automatically enhances the locking force to balance the expansion pressure. When the temperature decreases to form negative pressure, the elastic pre-tightening force relieves the rubber ring 7 from stretching to prevent the interface from separating, thereby effectively responding to the periodic impact of thermal expansion and cold contraction and dynamic load. At the same time, the design of the tapered guide head and the taper insertion groove 83 further limits the lateral displacement of the sliding block 81, ensures that the compensation action only proceeds in the axial direction, prevents structural misalignment, and the wavy anti-skid pattern increases the friction of the sliding surface to avoid accidental loosening caused by vibration.

[0037] The above merely describes the preferred embodiments of the present application, and is not intended to limit the present application in any form. Although the present application has been disclosed with the preferred embodiments as above, it is not intended to limit the present application. Any person skilled in the art can make some changes or modifications to the above disclosed technical content to obtain equivalent embodiments with equivalent changes, as long as the changes or modifications do not deviate from the technical solution of the present application. Any modification, change, equivalent change and modification of the above embodiments made according to the technical essence of the present application still belong to the scope of the technical solution of the present application.

Claims

1. A fully self-anchored flexible connection stainless steel clad pipe, characterized by, The utility model relates to a kind of sealing structure of pipe joint, including several steel pipe bodies and rubber ring, the end of the steel pipe body is formed socket and spigot respectively, the rubber ring is sealed and arranged at the joint of socket and spigot, corresponding sliding part and spring movable part are arranged on the matching surface of socket end and spigot end, sliding part and spring movable part constitute self-adapting dynamic compensation structure, when rubber ring is deformed due to wear or aging, sliding part and spring movable part are triggered linkage cooperation based on preset displacement threshold, through the synergistic effect of axial displacement compensation and elastic pre-tightening force, extrusion stress of rubber ring is dynamically maintained in preset threshold range, prevent overload failure caused by extrusion pressure fluctuation; The spring movable part includes a positioning seat arranged at the spigot end, a first limiting rod axially arranged in the positioning seat, a movable rod arranged parallel to the first limiting rod, a compression spring connecting the first limiting rod and the movable rod, and a rotary limiting mechanism; the rotary limiting mechanism includes a U-shaped limiting block, one end of the U-shaped limiting block is hinged to the positioning seat through a rotating shaft, and the other end of the U-shaped limiting block forms an arc-shaped protrusion which is clamped with the sliding part; the movable rod drives the U-shaped limiting block to rotate around the rotating shaft under the action of the compression spring, so as to dynamically adjust the locking force of the sliding part and the spring movable part; The sliding part is a sliding block provided with a wedge-shaped guide surface, a locking groove matching the arc-shaped protrusion is formed in the side wall of the sliding block, and the end of the U-shaped limiting block close to the movable rod is provided with an arc-shaped fitting surface matching the profile of the side wall of the sliding block; The first limiting rod extends to form a tapered guide head at the end, and the tapered guide head is inserted into a tapered slot formed in the side wall of the sliding block to limit the lateral displacement of the sliding block.

2. A fully self-anchored flexible connection stainless steel composite pipe according to claim 1, characterized in that, The pre-tightening force of the compression spring is positively correlated with the design internal pressure of the pipeline, when the compression amount of the rubber ring reaches the threshold value, the displacement of the movable rod triggers the rotation of the U-shaped limiting block, so that the arc-shaped protrusion and the locking groove form a progressive locking, and the self-balancing of the sealing pressure is realized.

3. The all-autonomous flexible connection stainless steel clad pipe according to claim 1, characterized in that, A wave-shaped anti-skid pattern is arranged between the wedge-shaped guide surface of the sliding block and the arc-shaped fitting surface of the U-shaped limiting block.

4. The all-autonomous flexible connection stainless steel clad pipe according to claim 1, characterized by, The rubber ring adopts a multi-layer composite structure, including an outer wear-resistant rubber layer, a middle nano-enhanced layer and an inner elastic compensation layer.

5. The fully self-anchored flexible connection stainless steel composite pipe according to claim 1, characterized in that, The positioning seat adopts a detachable mounting structure, the bottom of the positioning seat is provided with a dovetail groove, the spigot end is provided with a dovetail guide rail, the dovetail groove and the dovetail guide rail arranged at the spigot end are in sliding cooperation, and are fixed by locking bolts.

6. The all-autonomous flexible connection stainless steel clad pipe according to claim 1, wherein An auxiliary sealing structure is further arranged at the connection of the socket and the spigot, and the auxiliary sealing structure includes an annular sealing groove and a water-swelling sealing strip filled therein.

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