A high-pressure welded joint of a steel pipe

Abstract

The application relates to a high-pressure welding-free connecting steel pipe joint structure and belongs to the field of pipeline connection. The structure comprises a hollow shell, two cones arranged in the shell and communicated with each other, and two fastening joints movably connected at two ends of the shell respectively, the fastening joints are sleeved on a steel pipe inserted into the shell, the fastening joints are used for pushing flared ends of the steel pipe to abut against the cones, and a sealed communicating pipeline is formed between the cones and the steel pipe. The application has the effects of realizing welding-free pipeline sealing connection in a specific environment, high reliability of a sealing mode and controllable pipeline vibration.

Description

Technical Field

[0001] This application relates to the field of pipe connections, and more particularly to a high-pressure weldless connection steel pipe fitting. Background Technology

[0002] Pipe connection refers to the process of connecting prefabricated pipe sections into a complete system according to design drawings. In existing technologies, butt welding is one of the most common connection methods for steel pipes. This method uses butt welding to join two sections of steel pipe together, is suitable for spiral steel pipes of various diameters and wall thicknesses, and can be used for connections at different angles, including horizontal, vertical, and inclined positions. It has advantages such as simple process and material saving. (Refer to...) Figure 1 Before connection, steel pipe 1 usually needs to be flared. During processing, mechanical flaring or other methods are used to shape the end of steel pipe 1 into a certain angle and shape, making it an enlarged trumpet shape. At this time, both the inner and outer sides of the flared end 11 of the steel pipe form conical surfaces. Flaring can enlarge the end of steel pipe 1 to facilitate connection with other pipe fittings. On the other hand, flaring can increase the connection area of ​​steel pipe 1 and improve the strength of the connection.

[0003] However, when dealing with specific equipment or systems in enclosed, confined, or hazardous gas environments, if pipelines are connected by welding, explosions or fires may occur due to the welding equipment during manufacturing, assembly, or equipment maintenance, posing extremely high construction risks. Summary of the Invention

[0004] In order to achieve weldless pipeline sealing connection under specific conditions, and with high sealing reliability and controllable pipeline vibration, this application provides a high-pressure weldless connection steel pipe joint.

[0005] This application provides a high-pressure weldless steel pipe joint with the following technical solution: A high-pressure weldless steel pipe joint includes a hollow shell, two cones disposed inside the shell and communicating with each other, and two fastening joint assemblies respectively movably connected to both ends of the shell. The fastening joint assemblies are sleeved on the steel pipe inserted into the shell, and the fastening joint assemblies are used to push the flared end of the steel pipe against the cones, and a sealed connection pipeline is formed between the cones and the steel pipe.

[0006] By adopting the above technical solution, the shell is designed to assemble two flared steel pipes together without welding; the cone is designed to adapt to the connection with the flared end of the steel pipe; and the fastening joint is designed to firmly connect the steel pipe inside the shell, while pushing the flared end of the steel pipe to abut against the cone to form a sealed connecting pipeline.

[0007] Optionally, the fastening joint assembly includes a first fastening joint and a second fastening joint that are coaxially rotatably connected. The first fastening joint is located away from the cone, and the first fastening joint and the second fastening joint can rotate relatively independently. A fastener is detachably connected to the first fastening joint for fastening the first fastening joint to the steel pipe.

[0008] By adopting the above technical solution, the fastener is used to securely connect the fastening joint to the steel pipe; the fastening joint assembly is used to firmly connect the steel pipe to the shell, and at the same time push the flared end of the steel pipe to move towards the cone and abut against the cone to flare, forming a sealed connecting pipeline, and directly using the fastening assembly to flare.

[0009] Optionally, the fastener includes a nut threaded onto the fastening joint and a retainer disposed between the nut and the fastening joint. The nut and the retainer are fitted onto the steel pipe. The nut is used to press the retainer, and the retainer is used to embed into the gap between the fastening joint and the steel pipe to enhance the sealing performance.

[0010] By adopting the above technical solution, the ferrule can fill the gap between the fastening joint and the steel pipe, thereby enhancing the sealing between the two; the nut and the fastening joint are threaded together, and by rotating the nut, the ferrule can be tightened, so that the ferrule is firmly abutted against the fastening joint and the steel pipe, preventing the fastening joint and the steel pipe from slipping during the subsequent flaring process.

[0011] Optionally, the fastening connector has a conical surface near the ferrule, and the ferrule has a cutting edge that is embedded in the gap between the conical surface of the fastening connector and the steel pipe.

[0012] By adopting the above technical solution, the matching setting of the cutting edge and the conical surface allows the cutting edge to be embedded in the gap between the conical surface of the fastening joint and the steel pipe as the nut is continuously turned and pushed forward. At the same time, the middle of the ferrule bulges under pressure, thereby causing the fastening joint to grip the steel pipe, which can play a shock absorption role when vibration occurs.

[0013] Optionally, the card sleeve is made using a metal-coated process.

[0014] By adopting the above technical solution, the ferrule made with metal-coated rubber process has a rubber surface on its periphery, which increases the friction between the ferrule and the fastening connector and nut, and can play a better role in shock absorption when the steel pipe vibrates; at the same time, it increases the friction between the fastening connector and the steel pipe, preventing slippage between the fastening connector and the steel pipe.

[0015] Optionally, the two cones are provided with a first conical surface at their opposite ends, and the first conical surface can abut against the inner wall of the flared end of the steel pipe.

[0016] By adopting the above technical solution, the setting of the first conical surface can adapt to the required size of the flared end of the steel pipe and flare the steel pipe, ensuring that the cone and the flared end of the steel pipe can fit tightly together, thereby increasing the contact area between the two and enhancing the sealing performance at the junction of the flared end of the steel pipe and the cone.

[0017] Optionally, a bushing is provided between the cone and the second fastening joint. The bushing is fitted onto the steel pipe, and a second conical surface is provided at one end of the bushing facing the cone. The second conical surface is in close contact with the outer conical surface of the flared end of the steel pipe.

[0018] By adopting the above technical solution, the bushing and the second conical surface provide a guiding function for the flared end of the steel pipe. Compared with the fastening joint assembly, it can fit more closely against the outer conical surface of the flared end of the steel pipe. It can not only press the steel pipe to shape the outer conical surface of the flared end of the steel pipe, but also make the flared end of the steel pipe fit more tightly against the cone. Moreover, it can fill the gap between the fastening joint and the outer conical surface of the flared end of the steel pipe, further enhancing the sealing performance.

[0019] Optionally, a sealing ring is fitted on both the inner and outer circumferential surfaces of the bushing. The inner and outer sides of the sealing ring located on the outer circumferential surface of the bushing abut against the bushing and the housing, respectively; the inner and outer sides of the sealing ring located on the inner circumferential surface of the bushing abut against the bushing and the steel pipe, respectively.

[0020] By adopting the above technical solution, the sealing ring can further seal the gap between the bushing and the shell, effectively preventing the leaked medium at the junction of the cone and the steel pipe from continuing to flow outward; at the same time, it can also tighten the bushing so that it is more firmly fitted onto the steel pipe, thereby enhancing the sealing performance between the shell, bushing and steel pipe.

[0021] Optionally, the fastening joint assembly further includes a third fastening joint, which is threaded to the outside of the second fastening joint, and the end of the third fastening joint near the cone can abut against the end of the bushing away from the cone.

[0022] By adopting the above technical solution and setting the fastening joint three, the bushing can better abut against the outer conical surface of the flared end of the steel pipe in the axial direction. The bushing can apply greater pressure to the outer conical surface of the flared end of the steel pipe, further enhancing the sealing performance at the abutment position between the steel pipe and the cone.

[0023] Optionally, a sealed cavity is formed between the bushing, the cone, the housing, and the steel pipe. A sampling connector is connected to the housing, and the sampling connector communicates with the sealed cavity. The sampling connector is used to guide the medium that leaks into the sealed cavity to the outside.

[0024] By adopting the above technical solution, a sealed cavity will be formed between the bushing, cone, shell and steel pipe under the action of the sealing ring. When leakage occurs at the joint between the steel pipe and the cone, the leaked medium will be stored in the sealed cavity, and then the medium in the sealed cavity can be extracted through the sampling joint.

[0025] In summary, this application includes at least one of the following beneficial technical effects: 1. Through the coordinated arrangement of the shell, cone, fastening joint assembly, and bushing, especially the arrangement of the first and second conical surfaces, it is possible to sequentially flare the end connected to the steel pipe without welding, and ensure a tight fit between the inner and outer sides of the flared end, thereby assembling and sealing the two steel pipes together. The rigid seal formed by the fastening joint assembly and bushing enables weldless pipeline sealing connection under specific environments, and the sealing method has advantages such as high reliability and controllable pipeline vibration. 2. By combining the sealing ring and the sampling connector, when a medium leak occurs at the junction of the cone and the steel pipe, the leaked medium can be buffered in the sealed cavity, and the leaked medium in the sealed cavity can be guided to the outside in a timely manner through the sampling connector. 3. The combination of the nut and the ferrule made by the metal-coated process allows the ferrule and nut at the end of the fastening joint to grip the steel pipe tightly, thus providing a certain degree of shock absorption. Attached Figure Description

[0026] Figure 1 This is a three-dimensional schematic diagram made in this application to illustrate the specific structure of the steel pipe; Figure 2 This is a structural schematic diagram of a high-pressure weldless connection steel pipe joint according to Embodiment 1 of this application; Figure 3 This is a full sectional view of a high-pressure weldless steel pipe joint according to Embodiment 1 of this application; Figure 4 This is a structural schematic diagram of a high-pressure weldless connection steel pipe joint according to Embodiment 2 of this application; Figure 5 This is a full sectional view of a high-pressure weldless connection steel pipe joint according to Embodiment 2 of this application; Figure 6 yes Figure 5 Enlarged view of point A in the middle; Figure 7 yes Figure 5 Enlarged view of point B in the middle; Figure 8 yes Figure 5 Enlarged diagram of point C in the middle.

[0027] Explanation of reference numerals in the attached drawings: 1. Steel pipe; 11. Flared end; 2. Shell; 3. Cone; 31. First conical surface; 32. Guide groove; 4. Fastening joint assembly; 41. Fastening joint one; 411. Connecting piece; 412. Ball bearing; 413. Fixing plate; 414. Fixing screw; 42. Fastening joint two; 421. Fastening screw; 422. Connecting part; 4221. Sliding rod; 43. Fastening joint three; 5. Bushing; 51. Second conical surface; 52. Sealing groove; 6. Sealing ring; 7. Sealing cavity; 8. Sampling joint; 9. Fastener; 91. Nut; 92. Compression sleeve; 921. Cutting edge. Detailed Implementation

[0028] The following is in conjunction with the appendix Figure 1-8 This application will be described in further detail.

[0029] In this application, unless otherwise expressly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection, an electrical connection, or a communication connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0030] In this application, unless otherwise expressly specified and limited, the "above" or "below" of the second feature can mean that the first and second features are in direct contact, or that the first and second features are in indirect contact through an intermediate medium. In the description of this specification, references to terms such as "an embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of this application. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described can be combined in any suitable manner in one or more embodiments or examples.

[0031] This application discloses a high-pressure weldless connection steel pipe joint.

[0032] Example 1 Reference Figure 2 , Figure 3 and Figure 8The high-pressure weldless steel pipe joint includes a shell 2 with open ends and a hollow interior, two cones 3 disposed within the shell 2 and located in the middle of the shell 2, and two fastening joint assemblies 4 threaded to both ends of the shell 2. In embodiment 1, the fastening joint assemblies are integrally formed. The ends of the two cones 3 that are close to each other are fixed together and interconnected, while the ends of the two cones 3 that are far from each other are respectively processed into a first cone surface 31 that fits the inner cone surface of the flared end 11 of the steel pipe 1. It can be understood that the two cones 3 can be integrally formed directly within the shell 2, or they can be independently assembled structures. This embodiment of the application uses the example of two cones 3 integrally formed directly within the shell 2 for illustration. Two steel pipes 1 that need to be connected are inserted into the housing 2 through their open ends. Then, the two steel pipes 1 are pushed towards the cone 3, causing the inner conical surface of the flared end 11 of the steel pipe 1 to abut against the first conical surface 31 of the corresponding cone 3. Next, the fastening connector assembly 4 is fitted onto the steel pipe 1 and tightened towards the cone 3, pressing and fixing the flared end 11 of the steel pipe 1, thus installing the steel pipe 1 inside the housing 2. A guide groove 32 is provided along the axial direction on the circumferential surface of the cone 3. The guide groove 32 allows gas to flow freely between the contact surfaces during installation, helping to balance the pressure difference between the two ends of the cone 3 and preventing installation difficulties or sealing problems due to pressure imbalance.

[0033] Reference Figure 3 and Figure 8 A bushing 5 is also provided between the fastening joint assembly 4 and the cone 3. A through hole for the steel pipe 1 to pass through is provided in the middle of the bushing 5. The end of the bushing 5 away from the fastening joint assembly 4 is machined into a second conical surface 51 that fits against the outer conical surface of the flared end 11 of the steel pipe 1. In use, as the fastening joint assembly 4 is continuously tightened, the bushing 5 gradually moves towards the flared end 11 of the steel pipe 1 until the second conical surface 51 of the bushing 5 is tightly fitted against the outer conical surface of the flared end 11 of the steel pipe 1, thereby further pressing the steel pipe 1 against the cone 3 and enhancing the sealing between the bushing 5 and the steel pipe 1.

[0034] It is understandable that during the process of the medium passing through the steel pipe 1, leakage may occur at the contact point between the steel pipe 1 and the cone 3. Therefore, an O-ring seal 6 is also provided inside the shell 2. (Refer to...) Figure 3 and Figure 4 A sealing groove 52 for the sealing ring 6 to be embedded is formed on the outer wall of the bushing 5 along its circumference. The sealing groove 52 is located near the cone 3. In use, the inner and outer sides of the sealing ring 6 abut against the bushing 5 and the inner wall of the housing 2, respectively. Under the action of the sealing ring 6, a sealed cavity 7 is formed between the bushing 5, the steel pipe 1, the housing 2 and the cone 3. When there is a medium leakage at the abutment of the steel pipe 1 and the cone 3, the medium flows into the sealed cavity 7, and the sealing ring 6 will prevent the medium in the sealed cavity 7 from continuing to leak to the outside.

[0035] Reference Figure 3 and Figure 6 The housing 2 has two vertically spaced threaded connections for sampling connectors 8, which are respectively connected to two sealed cavities 7 inside the housing 2. In use, the user can use the two sampling connectors 8 to guide the leaked medium from the sealed cavity 7 to an external sensor or other monitoring or collection device.

[0036] Reference Figure 2 , Figure 3 and Figure 7 To ensure a tighter connection between the fastening joint assembly 4 and the steel pipe 1, a fastener 9 is also provided between them. The fastener 9 includes a nut 91 threaded onto the end of the fastening joint assembly 4 away from the cone 3, and a retainer 92 located between the fastening joint assembly 4 and the nut 91, inside the nut 91. The end of the fastening joint assembly 4 facing the nut 91 is machined into a conical surface, forming an angle with the horizontal plane. The end of the retainer 92 is machined into a cutting edge 921 that mates with the conical surface. It is understood that the angle between the conical surface and the horizontal plane can be various; this embodiment uses a 24-degree angle as an example. In use, the ferrule 92 and nut 91 are respectively placed on the steel pipe 1. Then, the nut 91 is screwed on to connect with the fastening joint assembly 4. The ferrule 92 moves forward as the nut 91 is screwed on. During the forward movement of the ferrule 92, the front end contracts. The cutting edge 921 at the front end of the ferrule 92 is embedded in the gap between the steel pipe 1 and the fastening joint assembly 4. The middle part of the ferrule 92 bulges and fits against the conical surface of the fastening joint assembly 4 to form a seal and hold the steel pipe 1 tightly.

[0037] The implementation principle of a high-pressure weldless connection steel pipe joint in Embodiment 1 of this application is as follows: In use, firstly, a section of steel pipe 1 is inserted into the housing 2 through the open end of the housing 2, and the steel pipe 1 is pushed until it cannot be pushed further. At this time, the inner conical surface of the flared end 11 of the steel pipe 1 abuts against the first conical surface 31 of the cone 3. Then, the bushing 5 and the fastening joint assembly 4 are sequentially fitted onto the steel pipe 1, and the sealing ring 6 is installed on the bushing 5. The fastening joint assembly 4 is screwed on until it cannot be screwed on. At this time, the second conical surface 51 of the bushing 5 abuts against the outer conical surface of the flared end 11 of the steel pipe 1. Finally, the clamp 92 and the nut 91 are sequentially fitted onto the steel pipe 1, and the nut 91 is continuously screwed on until it cannot be screwed on the fastening joint assembly 4. The above steps are repeated to complete the connection of the other section of steel pipe 1 at the other end of the housing 2, thus completing the weldless connection of the two sections of steel pipe 1 to form a sealed connecting pipeline.

[0038] When a medium leak occurs at the junction of steel pipe 1 and cone 3, the medium will seep into the sampling connector 8 on the shell 2. Since the sampling connector 8 is connected to external sensors or other monitoring devices, the leakage of the medium can be detected and extracted to the outside in a timely manner. A high-pressure, weldless steel pipe joint allows for a sealed connection between two sections of steel pipe 1 without welding, thus adapting to the installation of pipelines in specific equipment or systems located in confined, narrow, or hazardous gas environments, reducing the occurrence of safety accidents.

[0039] Example 2, Reference Figure 4 and Figure 5 The difference between this embodiment and Embodiment 1 is that the fastening joint assembly 4 includes a first fastening joint 41 and a second fastening joint 42 coaxially arranged. The first fastening joint 41 and the second fastening joint 42 are coaxially arranged, with the first fastening joint 41 located further away from the cone 3 than the second fastening joint 42. An annular groove is coaxially formed at the end of the first fastening joint 41 closest to the second fastening joint 42. An annular countersunk hole is coaxially formed at the position corresponding to the annular groove on the first fastening joint 41. The width of the countersunk hole is greater than the width of the annular groove, and the countersunk hole and the annular groove cooperate to form a stepped surface. A matching annular connector 411 is installed inside the annular groove. The connector 411 includes a rotating part and a fixing part coaxially arranged. The rotating part of the connector 411, away from the connecting part 422, abuts against the inside of the annular groove. The fixing part of the connector 411 extends towards the second fastening joint 42 and is vertically inserted into the second fastening joint 42. The second fastening joint 42 has a groove of corresponding size corresponding to the fixing part of the connector 411. A fixing plate 413 of corresponding size and shape is installed in the countersunk hole. One end of the fixing plate 413 abuts against the stepped surface of the countersunk hole, and the other end of the fixing plate 41 is flush with the end face of the fastening joint 41 near the fastening joint 42. Multiple fixing screws 414 are threadedly connected to the end of the fastening joint 41 away from the fastening joint 42. The fixing screws 414 are arranged in a circumferential array corresponding to the position of the fixing plate 413. The fixing screws 414 extend towards the fixing plate 413 and fix the fixing plate 413 to the fastening joint 41. At the same time, the fixing screws 414 and the fixing plate 413 cooperate to fix the connector 411 in the annular groove.

[0040] refer to Figure 5 and reference Figure 6Multiple fastening screws 421 are threaded onto the fixing part of the connector 411 on the outer diameter circumference of the second fastening joint 42. The fastening screws 421 are arranged in an array along the circumferential direction of the second fastening joint 42, and all the fastening screws 421 are perpendicular to the axis of the second fastening joint 42. The lower end of the fastening screw 421 passes through the fixing part of the connector 411 located in the second fastening joint 42. The fastening screws 421 firmly fix the connector 411 in the second fastening joint 42, thereby fixing the first fastening joint 41 and the second fastening joint 42 together. When the second fastening joint 42 moves along the axis of the steel pipe 1, it drives the first fastening joint 41 to move synchronously. The two ends of the rotating part of the connector 411 are respectively equipped with ball bearings 412. The two ball bearings 412 abut against the bottom of the annular groove and the fixing plate 413 respectively. The ball bearings 412 ensure that the connector 411 rotates smoothly in the fastening joint 41 and the fastening joint 42 can rotate relatively independently.

[0041] refer to Figure 3 and reference Figure 4 The fastening connector assembly 4 also includes a third fastening connector 43, which is fitted between the second fastening connector 42 and the housing 2. The third fastening connector 43 has threads machined on it to mate with the housing 2. A connecting portion 422 is fixed to the end of the second fastening connector 42 near the cone 3. The connecting portion 422 can be fixed by welding or interference fit. Threads mating with the housing 2 are machined on the outer circumferential surface of the connecting portion 422, and the second fastening connector 42 is threaded to the housing 2 through the connecting portion 422. In use, the second fastening connector 42 is first fitted onto one end of the third fastening connector 43, and then the connecting portion 422 is fixed to the end of the second fastening connector 42 away from the first fastening connector 41 by a destructive connection method such as welding or interference fit, thereby fixing the third fastening connector 43 onto the second fastening connector 42. Multiple sliding rods 4221 are arranged in a circular array along the connecting part 422. Both ends of the sliding rods 4221 pass through the connecting part 422 and slide back and forth along the axis of the second fastening joint 42. The ends of the sliding rods 4221 near the first joint are connected to form a ring and abut against the third fastening joint 43. The other end of the sliding rod 4221 abuts against the bushing 5. In use, after the steel pipe 1 is flared, tightening the third fastening joint 43 pushes the sliding rods 4221 towards the bushing 5. The bushing 5 moves towards the cone 3 under the push of the push rod. The second conical surface 51 of the bushing 5 abuts against the outside of the flared end 11 of the steel pipe 1 and presses and fixes the flared end 11. The fastening joint 3 43 and the sliding rod 4221 work together to apply greater pressure to the outer conical surface of the flared end 11 of the steel pipe 1, ensuring that the bushing 5 can better abut against the outer conical surface of the flared end 11 of the steel pipe 1 in the axial direction, further enhancing the sealing performance at the abutment position between the steel pipe 1 and the cone 3. The bushing 5 can apply greater pressure to the outer conical surface of the flared end 11 of the steel pipe 1, further enhancing the sealing performance at the abutment position between the steel pipe 1 and the cone 3.

[0042] The implementation principle of a high-pressure weldless connection steel pipe joint in Embodiment 2 of this application is as follows: In use, first, the nut 91, ferrule 92, fastening joint assembly 4, and bushing 5 with the sealing ring 6 installed are sequentially fitted onto the steel pipe 1; then, a section of the steel pipe 1 is inserted into the housing 2 through the open end, and the steel pipe 1 is pushed until it cannot be pushed further, at which point the steel pipe 1 abuts against the first conical surface 31 of the cone 3; subsequently, the threaded fastening joint 41 is tightened until it cannot be tightened further, and the fastening joint 41 is tightly gripped around the steel pipe 1; finally, the second fastening joint 42 is tightened using a pneumatic wrench. Fastening connector 2 42 drives fastening connector 3 43 to push steel pipe 1 towards cone 3. The flared end 11 of steel pipe 1 abuts against the first conical surface 31 of cone 3 and extends along the direction of the first conical surface 31 under pressure to form a conical surface. Using a pneumatic wrench, tightening fastening connector 3 43 pushes bushing 5 towards cone 3. The second conical surface 51 of bushing 5 abuts against the outer conical surface of the flared end 11 of steel pipe 1 and squeezes the outer conical surface of the flared end 11 to ensure that the flared end 11 of steel pipe 1 fits tightly against cone 3. Repeat the above steps to complete the connection of the other section of steel pipe 1 at the other end of shell 2. At this time, the weldless connection of the two sections of steel pipe 1 is completed to form a sealed connecting pipeline.

[0043] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. A high-pressure weldless steel pipe joint, characterized in that: It includes a hollow shell (2), two cones (3) disposed inside the shell (2) and connected to each other, and two fastening joint assemblies (4) movably connected to both ends of the shell (2). The fastening joint assembly (4) is sleeved on a steel pipe (1) inserted into the shell (2). The fastening joint assembly (4) is used to push the flared end (11) of the steel pipe (1) against the cone (3). A sealed connection pipeline is formed between the cone (3) and the steel pipe (1). The fastening joint assembly (4) includes a fastening joint one (41) and a fastening joint two (42) that are coaxially rotatably connected. The fastening joint one (41) is located away from the cone (3). The fastening joint one (41) and the fastening joint two (42) can rotate relatively independently. A fastener (9) is detachably connected to the fastening joint one (41). The fastener (9) is used to fasten the fastening joint one (41) to the steel pipe (1). The fastener (9) includes a nut (91) threaded onto the fastening joint (41) and a retainer (92) disposed between the nut (91) and the fastening joint (41). The nut (91) and the retainer (92) are fitted onto the steel pipe (1). The nut (91) is used to press the retainer (92) together. The retainer (92) is used to fit into the gap between the fastening joint (41) and the steel pipe (1) to enhance the sealing performance. The fastening connector (41) has a conical surface near the ferrule (92), and the ferrule (92) has a cutting edge (921) that is embedded in the gap between the conical surface of the fastening connector and the steel pipe (1). A bushing (5) is provided between the cone (3) and the fastening joint (42). The bushing (5) is fitted onto the steel pipe (1). A second conical surface (51) is provided at one end of the bushing (5) facing the cone (3). The second conical surface (51) is in close contact with the outer conical surface of the flared end (11) of the steel pipe (1).

2. The high-pressure weldless connection steel pipe joint according to claim 1, characterized in that: The card sleeve (92) is made using a metal-coated process.

3. The high-pressure weldless steel pipe joint according to claim 1, characterized in that: The two cones (3) are respectively provided with a first cone surface (31) at their opposite ends, and the first cone surface (31) can abut against the inner wall of the flared end (11) of the steel pipe (1).

4. A high-pressure weldless steel pipe joint according to claim 1, characterized in that: The bushing (5) is fitted with sealing rings (6) on both its inner and outer circumferential surfaces. The inner and outer sides of the sealing rings (6) on the outer circumferential surface of the bushing (5) abut against the bushing (5) and the housing (2), respectively. The inner and outer sides of the sealing rings (6) on the inner circumferential surface of the bushing (5) abut against the bushing (5) and the steel pipe (1), respectively.

5. A high-pressure weldless steel pipe joint according to claim 1, characterized in that: The fastening connector assembly (4) further includes a fastening connector three (43), which is threaded to the circumferential surface of the fastening connector two (42) and the circumferential surface of the fastening connector three (43) is threaded to the inner wall of the housing (2); the end of the fastening connector three (43) near the cone (3) can abut against the end of the bushing (5) away from the cone (3).

6. A high-pressure weldless steel pipe joint according to claim 1, characterized in that: A sealed cavity (7) is formed between the bushing (5), the cone (3), the housing (2), and the steel pipe (1). A sampling connector (8) is connected to the housing (2). The sampling connector (8) communicates with the sealed cavity (7). The sampling connector (8) is used to guide the medium that leaks into the sealed cavity (7) to the outside.

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