A lined stainless steel pipe

Abstract

The utility model relates to stainless steel pipe technical field discloses a kind of lining stainless steel pipes, including outer tube and inner tube, the inner tube outer wall sliding connection in the outer tube inner wall, the outer tube inner wall is equipped with multiple clamping grooves one, the inner tube outer wall is equipped with multiple clamping grooves two, locking assembly is arranged between the outer tube and inner tube, the locking assembly includes multiple C type locking ring, the C type locking ring outer wall is all sliding connection in the clamping groove one and clamping groove two inner wall, the C type locking ring bottom inner wall is all fixedly connected with multiple lock teeth, the clamping groove two inner wall bottom is equipped with multiple limit slot. In the utility model, first C type locking ring is pressed into clamping groove two, and lock tooth is clamped into limit slot to form one-way anti-retreating locking structure, then inner tube is inserted into outer tube inside, and C type locking ring outer wall is clamped into clamping groove one to form bidirectional mechanical occlusion, reach the effect of self-locking and anti-dropping, solve the problem that traditional lining pipe is easy to loosen and fall off, improve the stability of pipeline connection.

Description

Technical Field

[0001] This utility model relates to the field of stainless steel pipe technology, and in particular to a lined stainless steel pipe. Background Technology

[0002] Lined stainless steel pipes, as composite pipes that combine metal strength and corrosion resistance, are widely used in municipal water supply, gas transmission, chemical fluid transmission and other fields. Their core technology lies in the composite reliability of the stainless steel inner lining and the outer metal pipe and the stability of the connection structure. With the increasing requirements of industrial pipeline systems for pressure bearing capacity, service life and installation efficiency, how to achieve dual optimization of interlayer bonding strength and connection sealing through mechanical structural innovation has become the research focus in this field.

[0003] In existing technologies, the composite process of lined stainless steel pipes usually adopts interference fit or simple spinning process. The initial fixation is achieved by radial extrusion of the inner liner and the outer pipe. The interlayer bonding mainly relies on the friction of the metal surface and lacks a three-dimensional mechanical locking structure. In terms of connection method, traditional solutions mostly use threaded connection, flange connection or single sealing ring seal. Threaded connection is prone to wear and loosening of the thread due to vibration. The single sealing ring structure is prone to displacement or permanent compression deformation under the action of high pressure fluid. Especially in reducing pipe fittings or complex pipeline systems, the risk of seal failure increases significantly.

[0004] The aforementioned existing technologies generally suffer from insufficient vibration resistance and unstable sealing performance in their connection structures. Traditional connection methods are prone to loosening and detachment due to mechanical vibration or fluid impact during long-term operation, causing the gap between the inner liner and the outer pipe to widen. Furthermore, a single sealing structure cannot achieve dynamic pressure compensation. Under high-pressure conditions, the sealing ring is prone to tilting and detaching from the pipe wall, leading to media leakage. This not only affects the normal operation of the pipeline system but can also cause safety accidents or environmental pollution. Therefore, an inner-lined stainless steel pipe is proposed to solve the above problems. Utility Model Content

[0005] To overcome the above shortcomings, this utility model provides a lined stainless steel pipe, which aims to improve the problem of easy loosening and falling off of the lining pipe in the prior art.

[0006] To achieve the above objectives, the present invention adopts the following technical solution:

[0007] A lined stainless steel pipe includes an outer pipe and an inner pipe. The outer wall of the inner pipe is slidably connected to the inner wall of the outer pipe. The inner wall of the outer pipe has multiple slot 1, and the outer wall of the inner pipe has multiple slot 2. The slot 1 and slot 2 are arranged in an array. A locking component is provided between the outer pipe and the inner pipe.

[0008] The locking assembly includes multiple C-shaped locking rings. The outer walls of the C-shaped locking rings are slidably connected to the inner walls of the first and second slots. Multiple locking teeth are fixedly connected to the bottom inner walls of the C-shaped locking rings. Multiple limiting grooves are opened at the bottom of the inner wall of the second slot. The locking teeth and limiting grooves are arranged in an array. The outer walls of the locking teeth are slidably connected to the inner walls of the limiting grooves.

[0009] As a further description of the above technical solution:

[0010] Each of the card slots has a drainage hole at the bottom of its inner wall. The drainage hole is used to drain the condensate generated in the gap between the outer and inner pipes during the use of the pipeline, so as to prevent corrosion of the outer pipe.

[0011] As a further description of the above technical solution:

[0012] A fixing ring is fixedly connected to one side of the outer wall of the outer tube, and a fixing seat is fixedly connected to the other side of the outer wall of the outer tube.

[0013] As a further description of the above technical solution:

[0014] The sidewall of the fixed ring is provided with a first bearing ring, a second bearing ring, and a third bearing ring, which are arranged in a stepped manner.

[0015] As a further description of the above technical solution:

[0016] The first bearing ring sidewall is fixedly connected to the fixed ring sidewall, the second bearing ring sidewall is fixedly connected to the first bearing ring sidewall, and the third bearing ring sidewall is fixedly connected to the second bearing ring sidewall.

[0017] As a further description of the above technical solution:

[0018] The outer walls of the first, second, and third bearing rings are all provided with irregularly shaped slots, and the inner walls of the irregularly shaped slots are all slidably connected with sealing rings.

[0019] As a further description of the above technical solution:

[0020] The inner wall of the fixed base is provided with a locking groove, and the inner wall of the locking groove is provided with multiple sealing grooves, which are distributed in an array.

[0021] This utility model has the following beneficial effects:

[0022] 1. In this utility model, the C-shaped locking ring is first pressed into the inner tube's outer wall groove two, causing it to contract radially. Due to elastic deformation, a continuous radial rebound force is generated, allowing multiple locking teeth on the bottom inner wall to engage with the bottom limiting groove of the inner wall of groove two, forming a one-way anti-retrieval locking structure. Then, the inner tube is inserted into the outer tube, and hydraulic expansion is used to make the outer wall of the inner tube fit against the inner wall of the outer tube, allowing the outer wall of the C-shaped locking ring to engage with the inner groove one of the outer tube, forming a two-way mechanical engagement. This achieves a self-locking and anti-detachment effect between the outer tube and the inner tube, solving the problem of easy loosening and detachment of traditional inner lining tubes, and improving the reliability and stability of pipe connections.

[0023] 2. In this utility model, the sealing rings are first inserted into the corresponding irregular grooves on the outer walls of the first, second, and third bearing rings in sequence, so that the bottom outer wall of the sealing ring fits against the inner wall of the irregular groove. Then, a tool is used to insert the three bearing rings at one end of the fixing ring into the locking groove of another pipe fixing seat, so that the top outer wall of the sealing ring on the outer wall of the bearing ring fits into the sealing groove on the inner wall of the fixing seat to complete the seal. The greater the fluid pressure in the pipeline, the closer the outer wall of the sealing ring fits against the inner wall of the locking groove, forming a dynamic pressure compensation seal, achieving multiple sealing and anti-loosening effects, enhancing the anti-slip effect of the sealing ring, solving the problem of easy leakage and loosening of traditional seals, and improving the sealing performance and stability of the pipeline connection. Attached Figure Description

[0024] Figure 1 This is a perspective view of a lined stainless steel pipe proposed in this utility model.

[0025] Figure 2 This is a schematic diagram of the inner tube structure of an inner-lined stainless steel pipe proposed in this utility model.

[0026] Figure 3 This is a schematic diagram of the sealing ring structure of an inner-lined stainless steel pipe proposed in this utility model.

[0027] Figure 4 for Figure 3 Enlarged view of point A in the middle;

[0028] Figure 5 This is a schematic diagram of a locking groove structure for an inner-lined stainless steel pipe proposed in this utility model.

[0029] Legend:

[0030] 1. Outer tube; 2. Inner tube; 3. C-type locking ring; 4. Locking tooth; 5. Slot 1; 6. Slot 2; 7. Limiting groove; 8. Drain hole; 9. Fixing ring; 10. Fixing seat; 11. First bearing ring; 12. Second bearing ring; 13. Third bearing ring; 14. Sealing ring; 15. Irregularly shaped slot; 16. Locking groove; 17. Sealing groove. Detailed Implementation

[0031] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0032] Reference Figure 1 and Figure 2 The present invention provides an embodiment of a lined stainless steel pipe, comprising an outer pipe 1 and an inner pipe 2. The outer pipe 1 is made of carbon steel, and the inner pipe 2 is made of 304 stainless steel, which has the characteristics of corrosion resistance and high strength. The outer wall of the inner pipe 2 is slidably connected to the inner wall of the outer pipe 1 to form a double-layer pipeline structure. The inner wall of the outer pipe 1 has multiple slots 5, which are machined from the inner wall of the pipe to accommodate C-type locking rings 3 and provide radial constraint. The outer wall of the inner pipe 2 has multiple slots 6, which are arranged in an array and correspond to the structure of slots 5. They are used to cooperate with C-type locking rings 3 to achieve mechanical locking between the inner pipe 2 and the outer pipe 1. A locking component is provided between the outer pipe 1 and the inner pipe 2.

[0033] The locking assembly includes multiple C-shaped locking rings 3, which are made of spring steel and have elastic deformation capability. The outer walls of the C-shaped locking rings 3 are slidably connected to the inner walls of slot 1 5 and slot 2 6, used to lock the inner tube 2 and outer tube 1 through elastic rebound force. Multiple locking teeth 4 are fixedly connected to the bottom inner wall of each C-shaped locking ring 3. The locking teeth 4 have a triangular structure, are made of metal, and are used to engage with limiting grooves 7 to form a one-way lock. Multiple limiting grooves 7 are opened at the bottom of the inner wall of slot 2 6. Both the locking teeth 4 and the limiting groove 7 are arranged in an array and their shapes match the locking teeth 4. They are used to accommodate the locking teeth 4 and restrict the axial movement of the inner tube 2. The outer wall of the locking teeth 4 is slidably connected to the inner wall of the limiting groove 7. Drainage holes 8 are opened at the bottom of the inner wall of the slot 5. The drainage holes 8 are circular through holes. The drainage holes 8 are used to discharge the condensate generated in the gap between the outer tube 1 and the inner tube 2 during the use of the pipeline into the inner tube 1 by gravity or fluid pressure, so as to prevent the accumulation of condensate and corrosion of the outer tube 1 and improve the durability of the pipeline system.

[0034] Specifically, during the installation of the inner-lined stainless steel pipe, the worker first aligns the C-type locking ring 3 with the groove 6 on the outer wall of the inner pipe 2. A ring presser is then used to apply radial pressure to the C-type locking ring 3. Under this pressure, the C-type locking ring 3 undergoes elastic deformation, radially contracting and reducing its outer diameter, allowing it to smoothly embed into the groove 6. Due to the open structure and material elasticity of the C-type locking ring 3, it generates a continuous radial rebound force during deformation. Once the C-type locking ring 3 is embedded in the groove 6... The locking teeth 4 on the inner wall of the inner tube 2 are aligned with the limiting groove 7 at the bottom of the inner wall of the second groove 6. The radial rebound force of the C-type locking ring 3 pushes the locking teeth 4 to move towards the limiting groove 7 until the locking teeth 4 are completely engaged in the interior of the limiting groove 7, forming a one-way anti-reverse locking structure. At this time, the inner tube 2 and the C-type locking ring 3 are fixed in the axial direction. Subsequently, the operator inserts the inner tube 2 together with the C-type locking ring 3 into the interior of the outer tube 1 until the second groove 6 on the outer wall of the inner tube 2 is aligned with the first groove 5 on the inner wall of the outer tube 1. At this point, a radial force is applied to the inner tube 2 using a hydraulic expansion device or mechanical expansion tool. Under pressure, the inner tube 2 undergoes elastic deformation, and its outer wall gradually adheres to the inner wall of the outer tube 1, increasing its diameter. As the inner tube 2 expands radially, the C-shaped locking ring 3 is subjected to bidirectional compression from both the outer wall of the inner tube 2 and the inner wall of the outer tube 1. Its outer wall is pressed into the groove 5 of the outer tube 1. The inner wall of the groove 5 exerts radial constraint on the C-shaped locking ring 3, preventing it from rebounding. Simultaneously, the radial rebound force of the C-shaped locking ring 3 causes... Its outer wall is tightly fitted with the inner wall of slot 1 5, and its inner wall is tightly fitted with the inner wall of slot 2 6, forming a two-way mechanical engagement. Through the above operations, by utilizing the elastic deformation of the C-type locking ring 3, the one-way locking of the locking teeth 4 and the limiting groove 7, and the two-way mechanical engagement after hydraulic expansion, the self-locking and anti-disengagement between the outer tube 1 and the inner tube 2 is achieved, ensuring the connection stability of the pipeline system under high pressure, vibration and other working conditions. At the same time, the setting of the drain hole 8 effectively drains condensate, ensuring the corrosion resistance of the pipeline.

[0035] Reference Figures 3-5A fixing ring 9, made of stainless steel, is fixedly connected to one side of the outer wall of the outer pipe 1. This fixing ring 9 provides a support structure for pipe connections. A fixing seat 10, also made of stainless steel, is fixedly connected to the other side of the outer wall of the outer pipe 1. This seat 10 mates with the fixing ring 9 of another pipe to achieve connection. The side wall of the fixing ring 9 is provided with a first bearing ring 11, a second bearing ring 12, and a third bearing ring 13. The first bearing ring 11, second bearing ring 12, and third bearing ring 13 are arranged in a stepped pattern, with their diameters decreasing sequentially. They are all made of stainless steel and are used for layered installation of the sealing ring 14 and providing radial support. The side wall of the first bearing ring 11 is fixedly connected to the side wall of the fixing ring 9, the side wall of the second bearing ring 12 is fixedly connected to the side wall of the first bearing ring 11, and the side wall of the third bearing ring 13 is fixedly connected to the side wall of the second bearing ring 12, forming a stepped bearing structure. The outer walls of the carrier ring 12 and the third carrier ring 13 are provided with irregularly shaped grooves 15. The irregularly shaped grooves 15 are machined and their inner wall shape matches the bottom of the sealing ring 14. They are used to fix the sealing ring 14 and limit its radial displacement. The inner walls of the irregularly shaped grooves 15 are slidably connected to the sealing rings 14. The sealing rings 14 are made of nitrile rubber, which has good elasticity and corrosion resistance. They are used to fill the gaps at the pipe connection and achieve the sealing function. The inner wall of the fixing seat 10 is provided with a locking groove 16. The locking groove 16 is a stepped through hole with a diameter that matches the stepped structure of the fixing ring 9. It is used to accommodate the first carrier ring 11, the second carrier ring 12, and the third carrier ring 13 of the fixing ring 9. The inner wall of the locking groove 16 is provided with multiple sealing grooves 17, which correspond to the positions of the irregularly shaped grooves 15. They are machined and used to snap into the top of the sealing ring 14 to enhance the sealing effect. The sealing grooves 17 are distributed in an array.

[0036] Specifically, when connecting two pipes, the worker first aligns the sealing rings 14 one by one with the irregular grooves 15 on the outer walls of the first bearing ring 11, the second bearing ring 12, and the third bearing ring 13. Using a tool, the sealing rings 14 are pressed radially into the irregular grooves 15. Under pressure, the sealing rings 14 undergo elastic deformation, their cross-sectional shape fitting the inner wall of the irregular groove 15, and their bottom outer wall making tight contact with the bottom and sides of the irregular groove 15, completing the pre-installation of the sealing rings 14. Then, the worker holds the pipe containing the fixing ring 9 and aligns the first bearing ring 11, the second bearing ring 12, and the third bearing ring 13 with the locking groove 16 of the fixing seat 10 of the other pipe, inserting the stepped structure into the locking groove 16. During insertion, the top outer wall of the sealing ring 14 contacts the inner wall of the locking groove 16 and is subjected to radial compression, causing further elastic deformation of the sealing ring 14. When the stepped structure of the fixing ring 9 is complete... After being fully inserted into the locking groove 16, the top outer walls of the sealing rings 14 on the outer walls of the first bearing ring 11, the second bearing ring 12, and the third bearing ring 13 are precisely engaged in the sealing groove 17 on the inner wall of the fixing seat 10. The inner wall of the sealing groove 17 forms a radial constraint on the sealing ring 14, preventing it from sliding outward. At the same time, the fluid pressure in the pipeline acts on the inner side of the sealing ring 14, generating an outward thrust, making the outer wall of the sealing ring 14 fit more tightly against the inner wall of the locking groove 16. This dynamic pressure compensation mechanism means that the greater the fluid pressure, the higher the fit between the sealing ring 14 and the inner wall of the locking groove 16, forming a self-tightening sealing effect. Through the cooperation of the stepped bearing rings, the irregular groove 15, and the sealing groove 17, the layered installation and positioning of the multiple sealing rings 14 are realized, which not only enhances the reliability of the seal, but also automatically strengthens the sealing performance through fluid pressure, effectively preventing leakage at the pipeline connection and improving the stability and safety of the system.

[0037] Working principle: When installing the inner-lined stainless steel pipe, the worker first presses the C-type locking ring 3 into the groove 6 on the outer wall of the inner pipe 2, causing it to contract radially. At the same time, the C-type locking ring 3 generates a continuous radial rebound force due to elastic deformation, causing multiple locking teeth 4 on its bottom inner wall to engage with the limiting groove 7 at the bottom of the groove 6, forming a one-way anti-removal locking structure. Then, after the worker inserts the inner pipe 2 into the outer pipe 1, the outer wall of the inner pipe 2 is made to fit against the inner wall of the outer pipe 1 through hydraulic or mechanical expansion, so that the outer wall of the C-type locking ring 3 is also engaged with the groove 5 inside the outer pipe 1, thus forming a two-way mechanical engagement, thereby achieving the self-locking and anti-disengagement effect between the outer pipe 1 and the inner pipe 2.

[0038] When connecting two pipes, the worker first inserts the sealing ring 14 into the corresponding irregular grooves 15 on the outer walls of the first bearing ring 11, the second bearing ring 12, and the third bearing ring 13, so that the bottom outer wall of the sealing ring 14 fits against the inner wall of the irregular groove 15. Then, using a tool, the first bearing ring 11, the second bearing ring 12, and the third bearing ring 13 at the end of the fixing ring 9 are inserted into the locking groove 16 of the fixing seat 10 of the other pipe, so that the top outer wall of the sealing ring 14 on the outer walls of the first bearing ring 11, the second bearing ring 12, and the third bearing ring 13 fits into the corresponding sealing groove 17 on the inner wall of the fixing seat 10. This completes the sealing between the pipes. The greater the fluid pressure in the pipe, the closer the outer wall of the sealing ring 14 fits against the inner wall of the locking groove 16, forming a dynamic pressure compensation seal, achieving multiple sealing and anti-loosening effects, and enhancing the anti-slip effect of the sealing ring 14.

[0039] Finally, it should be noted that the above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Although the present utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A lined stainless steel pipe, comprising an outer pipe (1) and an inner pipe (2), characterized in that: The outer wall of the inner tube (2) is slidably connected to the inner wall of the outer tube (1). The inner wall of the outer tube (1) is provided with multiple slots 1 (5), and the outer wall of the inner tube (2) is provided with multiple slots 2 (6). The slots 1 (5) and slots 2 (6) are arranged in an array. A locking component is provided between the outer tube (1) and the inner tube (2). The locking assembly includes multiple C-shaped locking rings (3). The outer walls of the C-shaped locking rings (3) are slidably connected to the inner walls of the first slot (5) and the second slot (6). Multiple locking teeth (4) are fixedly connected to the bottom inner walls of the C-shaped locking rings (3). Multiple limiting grooves (7) are opened at the bottom of the inner wall of the second slot (6). The locking teeth (4) and the limiting grooves (7) are arranged in an array. The outer walls of the locking teeth (4) are slidably connected to the inner walls of the limiting grooves (7).

2. The lined stainless steel pipe according to claim 1, characterized in that: Drainage holes (8) are provided at the bottom of the inner wall of each slot (5). The drainage holes (8) are used to drain the condensate generated between the outer pipe (1) and the inner pipe (2) during the use of the pipeline and prevent corrosion of the outer pipe (1).

3. The lined stainless steel pipe according to claim 1, characterized in that: A fixing ring (9) is fixedly connected to one side of the outer wall of the outer tube (1), and a fixing seat (10) is fixedly connected to the other side of the outer wall of the outer tube (1).

4. The lined stainless steel pipe according to claim 3, characterized in that: The side wall of the fixed ring (9) is provided with a first bearing ring (11), a second bearing ring (12), and a third bearing ring (13), which are arranged in a stepped manner.

5. A lined stainless steel pipe according to claim 4, characterized in that: The side wall of the first bearing ring (11) is fixedly connected to the side wall of the fixed ring (9), the side wall of the second bearing ring (12) is fixedly connected to the side wall of the first bearing ring (11), and the side wall of the third bearing ring (13) is fixedly connected to the side wall of the second bearing ring (12).

6. A lined stainless steel pipe according to claim 5, characterized in that: The outer walls of the first bearing ring (11), the second bearing ring (12), and the third bearing ring (13) are all provided with irregularly shaped slots (15), and the inner walls of the irregularly shaped slots (15) are all slidably connected with sealing rings (14).

7. A lined stainless steel pipe according to claim 3, characterized in that: The inner wall of the fixed base (10) is provided with a locking groove (16), and the inner wall of the locking groove (16) is provided with a plurality of sealing grooves (17), which are distributed in an array.

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