Steel lining teflon expansion joint capable of being adjusted stably

Abstract

The invention relates to the technical field of hose and rigid element connection, in particular to a stable-adjustment steel lining polytetrafluoroethylene expansion joint which comprises an expansion part deforming in the axial direction and further comprises guide connecting assemblies arranged at the two ends of the expansion part, and the guide connecting assemblies are used for fixing the two ends of the expansion part and connecting other assemblies. The expansion part is pressed, the expansion part transmits part of pressure to the inner guide pipe and the annular embedded part, through deformation of the annular embedded part, the pressure borne by the expansion part is buffered, the pressure borne by the expansion part is reduced, and when the pressure in a system changes, the expansion joint can be subjected to the pressure effect to generate telescopic deformation and the like. If pressure is completely borne by the expansion joint, excessive deformation and even damage of the expansion joint can be caused, part of the pressure is transmitted to the annular embedded part, the pressure load of the expansion joint can be reduced, the expansion joint can work within a reasonable deformation range, and the service life of the expansion joint is prolonged.

Description

Technical Field

[0001] The invention relates to the technical field of connection between a hose and a rigid element, in particular to a steel-lined polytetrafluoroethylene expansion joint with stable adjustment. Background Art

[0002] Steel-lined PTFE expansion joints are mainly for corrosion protection and are mostly used for compensating the pipeline systems in the chemical, pharmaceutical, food and other industries. They also have an anti-corrosion effect. Through special processing methods, they have changed the previous characteristics of pipelines that cannot be bent, and can withstand various concentrations of acid, alkali and salt. It can be used to connect graphite, ceramic and glass pipelines with lower mechanical properties, and can be used as feed and discharge pipes for tank trucks, storage tanks, containers or reactors. It can be used for pipeline dislocation connection or to balance pipeline displacement and size changes caused by climate or other reasons, or to eliminate high-frequency mechanical vibrations.

[0003] Steel-lined PTFE expansion joints consist of an expansion part and a flange part. Generally speaking, their advantages are more prominent, but in certain specific cases, there may be some relative "disadvantages" or limitations. Without a connection structure, the expansion joint cannot effectively distribute and transmit the pressure load in the pipeline. Under the action of pressure, the expansion part may have problems such as excessive local deformation and rupture. The flange part may also fail to work with the expansion part, resulting in sealing failure, and the sealing and safety of the pipeline system cannot be guaranteed. Summary of the invention

[0004] The object of the present invention is to provide a steel-lined polytetrafluoroethylene expansion joint with stable adjustment to solve the problems raised in the above-mentioned background technology.

[0005] To achieve the above object, the present invention provides the following technical solution: a stable adjustable steel-lined polytetrafluoroethylene expansion joint, comprising an expansion portion deforming along the axial direction, the steel-lined polytetrafluoroethylene expansion joint also comprising: A guide connection assembly is provided at both ends of the expansion part, and is used for fixing the two ends of the expansion part and connecting other assemblies; An installation component is arranged outside the guide connection component, and the installation component provides a notch for installing the guide connection component; The expansion part is composed of an annular elastic member that deforms to adapt to expansion and a connecting pipe for connection; The guide connection assembly comprises an inner guide tube located outside the connection tube for guiding.

[0006] Preferably, the guide connection assembly further comprises an annular insert located outside the inner guide tube, and a clearance groove is formed on the annular insert; The annular insert is connected to a corresponding position on the mounting assembly.

[0007] Preferably, the annular elastic member is composed of an inner elastic ring located on the inner side, an outer elastic ring located on the outer side, and an elastic supporting ring located inside the annular elastic member.

[0008] Preferably, the elastic support rings are distributed in an annular array in the annular elastic member with the axis of the annular elastic member as the center; The elastic support ring exists in two states: a horizontal state and a vertical state, and the elastic support rings in the horizontal state and the vertical state are arranged at intervals.

[0009] Preferably, the mounting assembly further comprises a flange assisted in mounting by an annular insert; The flange is provided with a sealing ring installation groove, a fixing plug column for docking with another flange is arranged in the sealing ring installation groove, and a sealing ring for sealing is arranged in the sealing ring installation groove; The flange is provided with a fixing groove which is docked with the annular embedding piece.

[0010] Preferably, the thickness of the sealing ring is twice the depth of the sealing ring installation groove body; The length of the fixing plug is three times the depth of the sealing ring installation groove body.

[0011] Preferably, an outer positioning ring for assisting the fixing of the connecting tube is arranged outside the inner guide tube, and an inner annular groove which is sleeved outside the outer positioning ring is opened on the inner wall of the connecting tube.

[0012] Preferably, a fixing component is also provided outside the connecting pipe; The fixing assembly includes a fixing belt with one end fixed on the connecting tube and wrapped around the outside of the connecting tube, an end buckle for inserting the fixing belt is fixed on the fixed end of the fixing belt, a handle for auxiliary pulling is provided on the movable end of the fixing belt, and a locking member for applying pressure to fix the fixing belt is provided on the end buckle.

[0013] Preferably, the fixing belts are arranged in groups, and one group of fixing belts is arranged on the upper and lower sides of the outer positioning ring; A set of fixing belts are positioned and pressed from upper and lower sides of the outer positioning ring.

[0014] Preferably, a reinforcement component for strengthening fixation is provided between the guide connection component and the installation component, and the reinforcement component includes connection rings located above and below the flange, and a connection rod is provided between the connection rings for fixation; The annular insert is provided with a groove corresponding to the connecting ring and a slot corresponding to the connecting rod.

[0015] Compared with the prior art, the present invention has the following beneficial effects: 1. When the steel-lined PTFE expansion joint is in use, the expansion part is under pressure, and the expansion part transfers part of the pressure to the inner guide tube and the annular insert. The deformation of the annular insert buffers the pressure on the expansion part and reduces the pressure on the expansion part. When the pressure in the system changes, the expansion joint will be affected by the pressure and produce expansion and contraction deformation. If the pressure is completely borne by the expansion joint itself, it may cause excessive deformation or even damage. Transferring part of the pressure to the annular insert can reduce the pressure load of the expansion joint, so that it can work within a reasonable deformation range and extend the service life of the expansion joint. Long-term exposure to excessive pressure will cause fatigue of the expansion joint material and reduce material performance. By transferring part of the pressure to the annular insert, the number of stress cycles on the expansion joint material can be reduced, the risk of fatigue damage can be reduced, and the stable performance of the expansion joint can be ensured. The annular insert transfers part of the pressure to the flange, which can make the force on the flange connection more uniform. Under the action of pressure, the sealing surfaces between the flange and the pipeline and the expansion joint can fit better, reducing the problem of sealing failure caused by excessive local pressure or uneven force, ensuring good sealing of the system and preventing medium leakage.

[0016] 2. The annular design of the annular elastic part provides greater reverse elastic force. At the same time, the elastic support ring inside the annular elastic part also exerts pressure on the annular elastic part. The expansion part is composed of multiple annular elastic parts with internal elastic support rings, which have the advantages of enhanced structural stability, improved corrosion resistance, and optimized compensation capacity. Multiple pipes with internal support structures work together to evenly disperse the external pressure and avoid excessive local pressure. The support structure can effectively bear part of the pressure, making the expansion joint more stable when bearing system pressure and reducing the possibility of deformation or damage due to excessive pressure. The expansion joint composed of multiple pipes with support structures can provide better support and constraint for the pipeline, limit the displacement and deformation of the pipeline, ensure the overall stability of the pipeline system, and prevent safety accidents caused by pipeline instability.

[0017] 3. The expansion part and the installation component are connected through the guide connection component. The guide connection component can firmly connect the expansion part and the installation component together, so that the entire expansion joint can withstand the pressure in the pipeline system. Under high-pressure conditions, the connection structure can evenly transmit pressure to avoid stress concentration, ensure that the expansion joint will not break or loosen at the connection when it is under pressure, and ensure the safe operation of the pipeline system. The expansion part and the flange part of the expansion joint can be transported and installed separately by adopting the connection structure, which reduces the difficulty of the overall installation. When installing on site, it is only necessary to assemble the expansion part and the installation component through the guide connection component, which reduces the limitation of the installation space and improves the installation efficiency. At the same time, the standardized design of the guide connection component also makes the installation process more standardized and simple, which is convenient for construction personnel to operate. When the expansion part or the installation component of the expansion joint is damaged, the guide connection component is convenient for the damaged part to be disassembled and replaced separately, and the entire expansion joint does not need to be replaced, which reduces the maintenance cost and workload. The maintenance personnel can repair or replace the damaged part by disassembling the guide connection component, and then reconnect it, which shortens the maintenance time and reduces the impact on the normal operation of the pipeline system. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a schematic diagram of the main structure of the present invention.

[0019] Figure 2 It is a schematic diagram of the top view structure of the present invention.

[0020] Figure 3 It is a side view structural schematic diagram of the present invention.

[0021] Figure 4 It is a schematic diagram of the structure at the corresponding position of the inner guide tube of the present invention.

[0022] Figure 5 It is a structural schematic diagram of the corresponding position of the fixing component of the present invention.

[0023] Figure 6 It is a schematic diagram of the structure at the corresponding position of the outer positioning ring of the present invention.

[0024] Figure 7 It is a schematic diagram of the structure at the corresponding position of the installation component of the present invention.

[0025] Figure 8 It is a schematic diagram of the structure at the corresponding position of the fixed plug post of the present invention.

[0026] Fig. 9 It is a schematic diagram of the structure at the corresponding position of the reinforcement component of the present invention.

[0027] Fig.10 It is a schematic diagram of the structure at the corresponding position of the inner guide tube of the present invention.

[0028] Fig.11 It is a schematic diagram of the structure at the corresponding position of the annular elastic member of the present invention.

[0029] Fig.12 It is a schematic diagram of the structure at the corresponding position of the inner annular groove of the present invention.

[0030] Fig.13 It is a schematic diagram of the structure at the corresponding position of the elastic support ring of the present invention.

[0031] In the figure: 1. expansion part; 11. annular elastic member; 111. inner elastic ring; 112. outer elastic ring; 113. elastic support ring; 12. connecting pipe; 121. inner annular groove; 2. guide connection assembly; 21. inner guide tube; 211. outer positioning ring; 22. annular insert; 23. clearance groove; 3. installation assembly; 31. flange; 32. sealing ring installation groove; 33. fixing column; 34. sealing ring; 35. fixing groove; 4. fixing assembly; 41. fixing belt; 42. end buckle; 43. handle; 44. locking member; 5. reinforcement assembly; 51. connecting ring; 52. connecting rod. DETAILED DESCRIPTION

[0032] In order to make the purpose, technical solution and advantages of the present invention clearer, the technical solution in the embodiment of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiment of the present invention. Obviously, the described embodiment is a part of the embodiment of the present invention, not all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0033] The present invention provides a technical solution: a stable adjustable steel-lined polytetrafluoroethylene expansion joint, comprising an expansion portion 1 deformed along the axial direction, the expansion portion 1 is used for self-adapting the required deformation, and the steel-lined polytetrafluoroethylene expansion joint also includes: The guide connection component 2 is arranged at both ends of the expansion part 1. The guide connection component 2 is used to fix the two ends of the expansion part 1 and connect with other components. A tubular structure corresponding to the expansion part 1 is arranged on the guide connection component 2. The tubular structure of the expansion part 1 is sleeved outside the corresponding tubular structure on the guide connection component 2 to realize the assembly mode of split connection. The expansion part and the flange part of the expansion joint can be transported and installed separately by adopting the connection structure, which reduces the difficulty of the overall installation. When installing on site, it is only necessary to assemble the expansion part and the installation component through the guide connection component, which reduces the limitation of the installation space and improves the installation efficiency. At the same time, the standardized design of the guide connection component also makes the installation process more standardized and simple, which is convenient for construction personnel to operate. When the expansion part or the installation component of the expansion joint is damaged, the guide connection component is convenient for the damaged part to be disassembled and replaced separately, and the entire expansion joint does not need to be replaced, which reduces the maintenance cost and workload. The maintenance personnel can repair or replace the damaged part by disassembling the guide connection component, and then reconnect it, which shortens the maintenance time and reduces the impact on the normal operation of the pipeline system. The mounting assembly 3 is arranged outside the guide connection assembly 2. The mounting assembly 3 provides a notch for installing the guide connection assembly 2. The upper surface and the lower surface of the mounting assembly 3 are both provided with notches corresponding to the mounting assembly 3 to assist in the installation of the annular insert 22. Figure 1 , 2 , as shown in 3; The expansion part 1 is composed of an annular elastic member 11 that is deformed to adapt to expansion and a connecting pipe 12 for connection. The annular elastic member 11 and the connecting pipe 12 constitute a part and structure that adapts to expansion to adapt to the occurrence of adaptive deformation; The guide connection assembly 2 includes an inner guide tube 21 located outside the connecting tube 12 for guiding. The connecting tube 12 is located outside the inner guide tube 21 to achieve the installation of the connecting tube 12 outside the inner guide tube 21. At the same time, such a design can achieve the separate replacement of the annular elastic member 11 and the connecting tube 12, reducing the replacement loss. Figure 4 As shown; The guide connection component 2 also includes an annular insert 22 located outside the inner guide tube 21. A clearance groove 23 is provided on the annular insert 22. Due to the existence of the clearance groove 23, the annular insert 22 forms a structure consisting of two rings, one large and one small. The annular insert 22 is embedded in the corresponding fixing groove 35 on the installation component 3 to achieve the connection between the guide connection component 2 and the installation component 3. The annular insert 22 is a deformable structure to ensure the installation of the annular insert 22. The annular insert 22 is connected to the corresponding position on the mounting component 3. The mounting component 3 is provided with a fixing groove 35 corresponding to the annular insert 22 to achieve the connection between the guide connection component 2 and the mounting component 3. The annular insert 22 is made of elastic polymer materials, such as nitrile rubber, EPDM rubber, silicone rubber, etc. Nitrile rubber has excellent oil resistance and is often used to manufacture connecting rings such as oil pipelines and oil seals; EPDM rubber has good weather resistance, water resistance and electrical insulation.

[0034] The annular elastic member 11 is composed of an inner elastic ring 111 located on the inner side, an outer elastic ring 112 located on the outer side, and an elastic support ring 113 located inside the annular elastic member 11. The inner elastic ring 111 and the outer elastic ring 112 form a tubular structure. The tubular annular elastic member 11 has stronger strength. The annular elastic member 11 is less likely to deform when under pressure. At the same time, the annular elastic member 11 is more likely to rebound after deformation, so as to improve the durability of the annular elastic member 11. The elastic support ring 113 is located inside the annular elastic member 11 to support the elastic support ring 113 and improve the strength of the annular elastic member 11. The annular elastic member 11 is manufactured by a mold. The inner elastic ring 111 and the outer elastic ring 112 are respectively manufactured using different molds and then assembled. The mold material is selected according to the production batch, precision requirements and material properties of the annular elastic member 11. For annular tube molds with large production batches and high precision requirements, high-quality mold steels such as Cr12MoV and H13 are often selected. Etc. These mold steels have good wear resistance, corrosion resistance and thermal stability, which can ensure that the mold maintains stable dimensional accuracy and surface quality during long-term use; In order to improve the wear resistance, corrosion resistance and demoulding performance of the mold, the mold needs to be surface treated. Common surface treatment methods include nitriding treatment and hard chrome plating. Nitriding treatment can form a nitride layer with high hardness and good wear resistance on the mold surface, thereby increasing the service life of the mold; hard chrome plating treatment can make the mold surface have good finish and demoulding performance, which is convenient for product demoulding.

[0035] The elastic support rings 113 are distributed in an annular array in the annular elastic member 11 with the axis of the annular elastic member 11 as the center. The elastic support rings 113 are evenly distributed in the annular elastic member 11 to achieve uniform pressure on the annular elastic member 11 and ensure the strength of the annular elastic member 11. The elastic support ring 113 exists in two states: horizontal and vertical. The horizontal and vertical elastic support rings 113 are arranged at intervals to support the annular elastic member 11 in the horizontal and vertical states, ensuring that the annular elastic member 11 can remain stable when subjected to pressure in different directions.

[0036] The installation component 3 also includes a flange 31 assisted by the annular insert 22. The flange 31 is used to ensure assembly with other rigid components. It is the function of a conventional flange. The flange 31 is an important component for connecting the expansion joint with the pipeline or equipment. The flange 31 firmly connects the expansion joint with the pipeline or equipment, so that the entire system forms a continuous whole, ensuring that the medium can be smoothly transmitted in the system. In cooperation with the sealing element of the expansion joint, the flange 31 forms a good seal between the sealing surfaces through the pressure generated by tightening the bolts to prevent medium leakage, withstand the pressure of the medium in the pipeline, the thermal stress caused by temperature changes, and the mechanical stress of the pipeline system, etc., and evenly transmit these forces to the pipeline or equipment to ensure the stability and safety of the expansion joint and the entire system. The installation position of the flange 31 should be determined according to the design requirements of the pipeline system and the compensation direction of the expansion joint to ensure that the expansion joint can effectively compensate for the thermal displacement and other deformations of the pipeline; A sealing ring installation groove 32 is provided on the flange 31, a sealing ring 34 is installed in the sealing ring installation groove 32, a fixing plug 33 for docking with another flange 31 is provided in the sealing ring installation groove 32, a sealing ring 34 for sealing is provided in the sealing ring installation groove 32, and the sealing ring 34 is used for docking between the two flanges 31. The existence of the sealing ring 34 realizes the sealing between the two flanges 31 to prevent leakage of gas or liquid; The flange 31 is provided with a fixing groove 35 for docking with the annular insert 22. Figure 5 , 6 、7.

[0037] The thickness of the sealing ring 34 is twice the depth of the sealing ring installation groove 32; The length of the fixed plug 33 is three times the depth of the sealing ring installation groove 32. By limiting the thickness of the sealing ring 34, the sealing ring installation groove 32 and the fixed plug 33, it is ensured that the fixed plug 33 can be inserted into the corresponding groove on the other flange 31. The restriction behind the sealing ring 34 ensures that the sealing ring 34 can completely fill the sealing ring installation groove 32. The sealing ring 34 is mainly used to ensure the sealing and stability of the expansion joint during operation. The sealing ring 34 mainly relies on its own elastic deformation to compensate for the dimensional changes and displacements of the pipeline or equipment caused by temperature changes, mechanical vibrations and other factors. When the pipeline or equipment undergoes thermal expansion or contraction, the expansion joint sealing ring will elongate or compress accordingly, thereby absorbing these displacements and maintaining the sealing and stability of the system. At the same time, the sealing ring 34 forms a sealing barrier through the pressure between the contact surface with the pipeline or equipment to prevent medium leakage.

[0038] An outer positioning ring 211 is provided on the outside of the inner guide tube 21 to assist in fixing the connecting tube 12. An inner annular groove 121 is provided on the inner wall of the connecting tube 12 and is sleeved on the outer positioning ring 211. The outer positioning ring 211 and the inner annular groove 121 cooperate with each other to achieve the fixing effect of the connecting tube 12 and the inner guide tube 21 after docking, thereby improving the friction force at the connection position of the connecting tube 12 and the inner guide tube 21.

[0039] A fixing component 4 is also provided outside the connecting pipe 12; The fixing assembly 4 includes a fixing belt 41 whose one end is fixed to the connecting tube 12 and is wound around the connecting tube 12. An end buckle 42 for inserting the fixing belt 41 is fixed to the fixed end of the fixing belt 41. A handle 43 for auxiliary pulling is provided on the movable end of the fixing belt 41. A locking member 44 for applying pressure to the fixing belt 41 is provided on the end buckle 42. By applying pressure to the handle 43, the fixing belt 41 is tightened. After the fixing belt 41 is tightened, it passes through the end buckle 42. The fixing belt 41 is fixed by applying pressure to the locking member 44. The fixing assembly 4 can be a soft steel locking buckle. The soft steel has a high elongation. rate and impact toughness, which means that the locking buckle can deform to a certain extent without breaking when subjected to external impact or stretching, thereby ensuring its reliability and safety during use. The circular snap-on locking buckle used in this article is simple and quick to operate, and can quickly realize the locking and unlocking functions. The soft steel locking buckle has the advantages of low cost and high cost performance, and can save costs for users on the premise of meeting the use requirements; at the same time, its good toughness and machinability enable the soft steel locking buckle to adapt to various complex use environments and installation requirements, and has high versatility and applicability.

[0040] The fixing belts 41 are arranged in groups, and one group of fixing belts 41 is arranged on the upper and lower sides of the outer positioning ring 211; A set of fixing belts 41 are positioned and pressed from the upper and lower sides of the outer positioning ring 211. The fixing belts 41 are pressed to fix the connection position of the connecting tube 12 and the inner guide tube 21. At the same time, the fixing belts 41 are located above and below the outer positioning ring 211, further improving the fixing effect of the connection position of the connecting tube 12 and the inner guide tube 21. Figure 5 .

[0041] A reinforcing assembly 5 for strengthening fixation is provided between the guide connection assembly 2 and the installation assembly 3. The reinforcing assembly 5 includes connecting rings 51 located above and below the flange 31. A connecting rod 52 is provided between the connecting rings 51 for fixing. The installation of the annular insert 22 is fixed by the structure composed of the connecting ring 51 and the connecting rod 52, thereby ensuring that the annular insert 22 is fixed on the flange 31. The annular insert 22 is provided with a groove corresponding to the connecting ring 51 and a slot corresponding to the connecting rod 52 .

[0042] Working principle: The first step: multiple groups of inner elastic rings 111 form an internal connection structure, and multiple groups of outer elastic rings 112 form an external connection structure. Multiple groups of elastic support rings 113 are installed in the outer elastic ring 112. The outer elastic ring 112 and the inner elastic ring 111 are assembled together to form a complete annular elastic member 11. The connecting tubes 12 at the upper and lower ends of the annular elastic member 11 are sleeved on the inner guide tube 21, and the inner annular groove 121 in the connecting tube 12 is sleeved outside the outer positioning ring 211 to realize the assembly of the expansion part 1 and the guide connection component 2, and are fixed by the fixing component 4. The fixing belt 41 is wrapped around the outside of the connecting tube 12, and the fixing belt 41 passes through the end buckle 42 and is fixed by the locking member 44 to realize the fixation of the connection position of the expansion part 1 and the guide connection component 2.

[0043] Step 2: The annular insert 22 is deformed and sleeved on the installation component 3. A fixing groove 35 corresponding to the annular insert 22 is set on the installation component 3. The annular insert 22 is engaged at the corresponding position on the fixing groove 35 to achieve the connection between the installation component 3 and the guide connection component 2. After the connection between the two is completed, it is necessary to fix the connection position. The connecting ring 51 is engaged at the corresponding position on the annular insert 22, and the two connecting rings 51 are fixed by the connecting rod 52 to achieve the reinforcement of the connection position between the installation component 3 and the guide connection component 2.

[0044] Step 3: When the flanges 31 are docked, the sealing ring 34 is located in the sealing ring installation groove 32. By limiting the thickness of the sealing ring 34, the sealing ring installation groove 32 and the fixed plug 33, it is ensured that the fixed plug 33 can be inserted into the corresponding groove on the other flange 31. The restriction behind the sealing ring 34 ensures that the sealing ring 34 can completely fill the sealing ring installation groove 32.

[0045] Step 4: When the steel-lined polytetrafluoroethylene expansion joint is in use, the expansion part 1 is under pressure. When the expansion part 1 is under pressure, the expansion part 1 transfers part of the pressure to the inner guide tube 21, and the inner guide tube 21 transfers the pressure to the annular insert 22. The annular insert 22 is deformed under pressure. The deformation of the annular insert 22 buffers the pressure on the expansion part 1 and reduces the pressure on the expansion part 1. When the expansion part 1 is under pressure, the annular elastic member 11 is deformed. The annular design of the annular elastic member 11 provides a greater reverse elastic force. At the same time, the elastic support ring 113 in the annular elastic member 11 also exerts pressure on the annular elastic member 11 to increase the reverse elastic force of the annular elastic member 11 under pressure.

[0046] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A steel-lined polytetrafluoroethylene expansion joint with stable adjustment, comprising an expansion portion (1) deformable in the axial direction, characterized in that: The steel lined PTFE expansion joint also includes: A guide connection component (2) is arranged at both ends of the expansion part (1), and the guide connection component (2) is used to fix the two ends of the expansion part (1) and connect other components; An installation component (3) is arranged outside the guide connection component (2), and the installation component (3) provides a notch for installing the guide connection component (2); The expansion part (1) is composed of an annular elastic member (11) that deforms to adapt to expansion and a connecting pipe (12) for connection; The guide connection assembly (2) comprises an inner guide tube (21) located outside the connection tube (12) and used for guidance.

2. The adjustable and stable steel-lined polytetrafluoroethylene expansion joint according to claim 1, characterized in that: The guide connection assembly (2) further comprises an annular insert (22) located outside the inner guide tube (21), and a clearance groove (23) is formed on the annular insert (22); The annular insert (22) is connected to a corresponding position on the mounting assembly (3).

3. The adjustable and stable steel-lined polytetrafluoroethylene expansion joint according to claim 2, characterized in that: The annular elastic member (11) is composed of an inner elastic ring (111) located on the inner side, an outer elastic ring (112) located on the outer side, and an elastic support ring (113) located inside the annular elastic member (11).

4. The adjustable and stable steel-lined polytetrafluoroethylene expansion joint according to claim 3, characterized in that: The elastic support rings (113) are distributed in an annular array in the annular elastic member (11) with the axis of the annular elastic member (11) as the center; The elastic support ring (113) exists in two states: a horizontal state and a vertical state, and the elastic support rings (113) in the horizontal state and the vertical state are arranged at intervals.

5. The adjustable and stable steel-lined polytetrafluoroethylene expansion joint according to claim 4, characterized in that: The mounting assembly (3) further comprises a flange (31) assisted in mounting by an annular insert (22); The flange (31) is provided with a sealing ring installation groove (32), a fixing plug (33) for docking with another flange (31) is arranged in the sealing ring installation groove (32), and a sealing ring (34) for sealing is arranged in the sealing ring installation groove (32); The flange (31) is provided with a fixing groove (35) for docking with the annular insert (22).

6. The adjustable and stable steel-lined polytetrafluoroethylene expansion joint according to claim 5, characterized in that: The thickness of the sealing ring (34) is twice the depth of the sealing ring installation groove body; The length of the fixing plug post (33) is three times the depth of the sealing ring installation groove (32).

7. The adjustable and stable steel-lined polytetrafluoroethylene expansion joint according to claim 6, characterized in that: An outer positioning ring (211) is arranged outside the inner guide tube (21) to assist in fixing the connecting tube (12), and an inner annular groove (121) is formed on the inner wall of the connecting tube (12) and is sleeved outside the outer positioning ring (211).

8. The adjustable and stable steel-lined polytetrafluoroethylene expansion joint according to claim 7, characterized in that: A fixing component (4) is also provided outside the connecting pipe (12); The fixing assembly (4) comprises a fixing belt (41) having one end fixed to the connecting tube (12) and wound around the outside of the connecting tube (12); an end buckle (42) for inserting the fixing belt (41) is fixed to the fixed end of the fixing belt (41); a handle (43) for assisting in pulling is provided on the movable end of the fixing belt (41); and a locking member (44) for applying pressure to fix the fixing belt (41) is provided on the end buckle (42).

9. The adjustable and stable steel-lined polytetrafluoroethylene expansion joint according to claim 8, characterized in that: The fixing belts (41) are arranged in groups, and one group of fixing belts (41) is arranged on the upper and lower sides of the outer positioning ring (211); A set of fixing belts (41) are used to position and pressurize the outer positioning ring (211) from both upper and lower sides.

10. The adjustable and stable steel-lined polytetrafluoroethylene expansion joint according to claim 9, characterized in that: A reinforcing assembly (5) for strengthening fixation is provided between the guide connection assembly (2) and the mounting assembly (3), the reinforcing assembly (5) comprising connecting rings (51) located above and below the flange (31), and a connecting rod (52) is provided between the connecting rings (51) for fixation; The annular insert (22) is provided with a groove corresponding to the connecting ring (51) and a slot corresponding to the connecting rod (52).

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