Pipeline, steel pipeline flexible connector and production device thereof
The steel pipe flexible joint design addresses the lack of flexibility in steel pipe joints by enabling axial and radial movement, ensuring secure connections and preventing leakage and failure due to ground settlement and thermal expansion.
Patent Information
- Application Number
- CN202510500435.0
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-04-21
- Publication Date
- 2025-07-15
AI Technical Summary
The lack of flexibility of steel pipe interfaces leads to prone to cracking and leakage during foundation settlement and thermal expansion and contraction, and the expansion joints increase costs and fault points.
A flexible steel pipe interface is designed, including a socket, a socket and a sealing ring. A guide portion, a sealing groove and a redundant groove are provided between the socket and the socket to provide axial and radial degrees of freedom to ensure sealing and flexibility.
While ensuring sealing, steel pipes can move axially and deflect radially, overcoming the problems of foundation settlement and thermal expansion and contraction, avoid cracking and water leakage, and reduce costs.
Smart Images
Figure CN120312910A_ABST
Abstract
Description
Technical Field
[0001] The present invention belongs to the technical field of steel pipes, and particularly relates to a pipe, a flexible joint of a steel pipe and a production device thereof. Background Art
[0002] In the fields of water conveyance and heat supply, pipeline transmission is essential, and steel pipes are generally used for pipeline transmission. Steel pipes are generally connected by welding, flanges or clamps. Since the joints have no flexibility or the flexibility is small, cracking and water leakage accidents are likely to occur when local settlement occurs in the foundation. When steel pipes are used for heat supply, due to large thermal expansion and contraction of the pipes, and since there is no flexibility at the joints of the steel pipes, expansion joints must be provided during pipeline laying to release the stress generated during thermal expansion and contraction of the pipes. However, the expansion joints increase the cost and failure points. Therefore, it is urgent to solve the technical problem of the lack of flexibility of the joints of steel pipes to ensure that the pipeline can overcome problems such as foundation settlement and thermal expansion and contraction during service. Summary of the Invention
[0003] The purpose of the present invention is to provide a pipe, a flexible joint of a steel pipe and a production device thereof to solve the problems existing in the above-mentioned prior art.
[0004] To achieve the above purpose, the present invention provides a flexible joint of a steel pipe, including a socket, a spigot and a sealing ring; a first guiding portion is provided at the end of the pipe wall of the socket, and the first guiding portion contracts towards the central axis direction of the socket; the spigot is provided with a first end and a second end arranged oppositely, and the socket can be inserted into the spigot from the first end; the pipe wall of the spigot is sequentially provided with a second guiding portion, a sealing groove and a redundant groove arranged in a ring shape from the first end to the second end; the second guiding portion expands in a direction away from the central axis direction of the spigot; a radial gap for accommodating the deflection of the first guiding portion and an axial gap for accommodating the axial movement of the first guiding portion are provided between the first guiding portion and the redundant groove; the sealing ring is detachably connected between the sealing groove and the socket; the pipes where the socket and the spigot are located are steel pipes.
[0005] Optionally, the distances between the second guiding portion, the sealing groove and the redundant groove and the central axis of the spigot are all greater than the outer diameter of the socket.
[0006] Optionally, the sealing groove includes a first sealing surface and a second sealing surface. The first sealing surface is arranged on the side close to the first end, and the distance between the first sealing surface and the central axis of the spigot gradually increases from the first end to the second end; the second sealing surface is arranged on the side close to the second end, and the distance between the second sealing surface and the central axis of the spigot gradually decreases from the first end to the second end.
[0007] Optionally, the angle between the first sealing surface and the central axis of the socket is a first angle, the first angle is between 20° and 45°, the angle between the second sealing surface and the central axis of the socket is a second angle, the second angle is between 35° and 60°, and the second angle is greater than the first angle.
[0008] Optionally, based on the extrusion of the sealing groove and the socket, the sealing ring produces elastic deformation, and the side of the sealing ring close to the socket contacts the first sealing surface and the second sealing surface, and the side of the sealing ring close to the socket contacts them.
[0009] A pipeline comprises a plurality of pipeline bodies arranged in sequence, wherein adjacent pipeline bodies are plugged in and the steel pipeline flexible interface is formed between adjacent pipeline bodies.
[0010] Optionally, the pipeline body includes a transmission pipeline and a connecting pipeline, the connecting pipeline is arranged between two adjacent transmission pipelines, both ends of the connecting pipeline are sockets, and one end of the transmission pipeline close to the connecting pipeline is a spigot.
[0011] Optionally, a first thermal insulation layer and a first protective layer are sequentially arranged on the radial outer side of the pipeline body.
[0012] Optionally, a second thermal insulation layer and a second protective layer are sequentially arranged on the radial outer side of the flexible interface of the steel pipe, and the first protective layer and the second protective layer are fixedly connected; a flexible thermal insulation layer is arranged at the flexible interface of the steel pipe, one side of the flexible thermal insulation layer abuts against the pipe body, and the side of the flexible thermal insulation layer facing away from the pipe body abuts against the first protective layer and / or the second protective layer.
[0013] A device for producing a flexible joint of a steel pipe comprises a socket production device for producing a socket, the socket production device comprising a pressure roller, an outer mold and a driving mechanism; the working end of the pressure roller is provided with a forming working surface, and the socket working surface formed by the second guide portion, the sealing groove and the redundant groove is adapted to the forming working surface; the outer mold is arranged on the radially outer side of the pressure roller, and the outer mold and the pressure roller are respectively arranged on both sides of a steel pipe to be processed, and a protrusion for forming a curve of an outer wall of the socket is provided on the side of the outer mold close to the steel pipe to be processed.
[0014] The driving mechanism includes a first rotating part and a second rotating part. The first rotating part includes a first rotating element detachably connected to the pressure roller. Based on the rotation of the first rotating element, the pressure roller is controlled to rotate around its own central axis. The second rotating drive part includes a second rotating element detachably connected to the first rotating part. Based on the rotation of the second rotating element, the first rotating part and the pressure roller are controlled to rotate around the central axis of the steel pipe to be processed.
[0015] Compared with the prior art, the present invention has the following advantages and technical effects:
[0016] When installing the flexible joint of the steel pipe, first, arrange the sealing ring in the sealing groove, and limit the sealing ring through the sealing groove to prevent the sealing ring from sliding towards the second end of the socket during the process of inserting the socket into the spigot. Secondly, the first guiding part contracts towards the central axis direction of the socket, that is, the first guiding part protrudes inwards, the second guiding part expands towards the direction away from the central axis of the spigot, and the second guiding part protrudes outwards. During the alignment process of the socket and the spigot, even if there is a certain deviation in the relative position between the socket and the spigot, due to the opposite deflection directions of the first guiding part and the second guiding part, the second guiding part can guide the first guiding part to ensure that the socket can be quickly inserted into the spigot. Secondly, insert the socket from the first end into the inside of the spigot, and the first guiding part and the redundant groove are arranged opposite to each other to complete the installation work of the flexible joint of the steel pipe.
[0017] During the working process of the flexible joint of the steel pipe, due to the relative arrangement of the first guiding part of the socket and the redundant groove, when the steel pipe expands and contracts thermally, the redundant groove provides a redundant amount for the elongation and contraction of the steel pipe, that is, the socket can move along its central axis direction. During the movement, it is necessary to ensure that the sealing ring is continuously arranged between the sealing groove and the socket to ensure the sealing performance between the socket and the spigot. When geological changes or foundation settlement occur, the steel pipe will deflect. During the deflection process, the gap between the redundant groove and the first guiding part provides a deflection space for the deflection of the first guiding part, and during the deflection process, the sealing ring can ensure the sealing performance between the socket and the spigot. At the same time, the second guiding part expands towards the direction away from the central axis of the spigot, and the second guiding part provides a space for the deflection of the steel pipe to prevent the steel pipe from extruding the end of the spigot during the deflection process and ensure the integrity of the spigot. The flexible joint of the steel pipe in the present application provides degrees of freedom for the steel pipe in the radial and axial directions, that is, while ensuring the sealing performance of the flexible joint, the steel pipe can move axially and deflect radially, solving the technical problem of the lack of flexibility of the steel pipe joint and ensuring that the pipeline can overcome problems such as foundation settlement and thermal expansion and contraction during service. BRIEF DESCRIPTION OF THE DRAWINGS
[0018] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for use in the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.
[0019] Figure 1 Schematic diagram of the pipeline body structure of the present invention;
[0020] Figure 2Schematic diagram of the flexible joint structure of the steel pipe of the present invention;
[0021] Figure 3 Schematic diagram of the structure of the heating pipe of the present invention;
[0022] Figure 4 Schematic diagram of the structure of the connecting pipe of the present invention;
[0023] Figure 5 Schematic diagram of the structure of the transmission pipe of the present invention;
[0024] Figure 6 Schematic diagram of the structure of the pipe of the present invention;
[0025] Figure 7 Another schematic diagram of the structure of the heating pipe of the present invention;
[0026] Figure 8 Another schematic diagram of the flexible joint structure of the steel pipe of the present invention;
[0027] Figure 9 Schematic diagram of the structure of the production device of the flexible joint of the steel pipe of the present invention;
[0028] Figure 10 Another schematic diagram of the structure of the production device of the flexible joint of the steel pipe of the present invention in another state.
[0029] Among them, 1, socket; 11, first guiding part; 2, socket; 21, second guiding part; 221, first sealing surface; 222, second sealing surface; 22, sealing groove; 23, redundant groove; 3, sealing ring; 31, pressure-bearing groove; 41, first heat-insulating layer; 42, first protective layer; 43, second heat-insulating layer; 44, second protective layer; 45, flexible heat-insulating layer; 51, pressure roller; 52, outer mold; 6, pipe body; 61, transmission pipe; 62, connecting pipe. Detailed implementation manners
[0030] It should be noted that, without conflict, the embodiments and features in the embodiments of the present invention can be combined with each other. The described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention. The present invention will be described in detail below with reference to the drawings and in conjunction with the embodiments.
[0031] Refer to Figures 1-10, the present invention provides a flexible joint for a steel pipe, including a socket 1, a socket 2 and a sealing ring 3; a first guiding portion 11 is provided at the end of the pipe wall of the socket 1, and the first guiding portion 11 contracts towards the central axis direction of the socket 1; the socket 2 is provided with a first end and a second end arranged oppositely, and the socket 1 can be inserted into the socket 2 from the first end; the pipe wall of the socket 2 is successively provided with a second guiding portion 21, a sealing groove 22 and a redundant groove 23 arranged annularly from the first end to the second end; the second guiding portion 21 expands away from the central axis direction of the socket 2; a radial gap for accommodating the deflection of the first guiding portion 11 and an axial gap for accommodating the axial movement of the first guiding portion are provided between the first guiding portion 11 and the redundant groove 23; the sealing ring 3 is detachably connected between the sealing groove 22 and the socket 1; the pipes where the socket 1 and the socket 2 are located are steel pipes. In this embodiment, the structure connected to the second end of the socket 2 is different according to different layout situations, and the structure connected to the second end of the socket 2 can be a straight pipe portion of the pipe or the second end of another socket in a double-socket pipe.
[0032] When installing the flexible joint of the steel pipe, first, arrange the sealing ring 3 into the sealing groove 22, and apply lubricating oil to the contact surface between the sealing ring 3 and the socket 1, and also need to apply lubricating oil to the outer surface of the socket 1 to reduce the friction between the contact surfaces of the sealing ring 3 and the socket 1 when the socket 1 is inserted into the socket 2, which is convenient for installation. The sealing ring 3 is limited by the sealing groove 22 to prevent the sealing ring from sliding towards the second end of the socket during the process of inserting the socket 1 into the socket 2. And because the first guiding portion 11 contracts towards the central axis direction of the socket 1, that is, the first guiding portion 11 protrudes inwards, showing an inverted flared shape, there is a certain space between the first guiding portion 11 and the sealing ring 3 when the socket 1 passes through the sealing ring 3, preventing the sealing ring 3 from being pushed out of the sealing groove 22 by the socket 1; the second guiding portion 21 expands away from the central axis direction of the socket 2, and the second guiding portion 21 protrudes outwards, showing a flared shape; during the alignment process of the socket 1 and the socket 2, even if there is a certain deviation in the relative positions of the socket 1 and the socket 2, since the deflection directions of the first guiding portion 11 and the second guiding portion 21 are opposite, the second guiding portion 21 can guide the first guiding portion 11 to ensure that the socket 1 can be quickly inserted into the socket 2; secondly, insert the socket 1 from the first end into the interior of the socket 2, and the first guiding portion 11 and the redundant groove 23 are arranged oppositely to complete the installation work of the flexible joint of the steel pipe.
[0033] During the operation of the flexible joint of the steel pipe, since the first guiding portion 11 of the socket 1 is disposed opposite to the redundant groove 23, and an axial gap for accommodating the axial movement of the first guiding portion is provided between the first guiding portion 11 and the redundant groove 23. When the steel pipe expands and contracts due to thermal expansion and contraction, the redundant groove 23 provides a redundant amount for the elongation and contraction of the steel pipe, that is, the socket 1 can move along the direction of its central axis. During the movement, it is necessary to ensure that the sealing ring 3 is continuously arranged between the sealing groove 22 and the socket 1 to ensure the sealing performance between the socket 1 and the socket 2. When geological changes or foundation settlement occur, the steel pipe will deflect. During the deflection process, the radial gap between the redundant groove 23 and the first guiding portion 11 provides a deflection space for the deflection of the first guiding portion 11, and the sealing ring 3 can ensure the sealing performance between the socket 1 and the socket 2 during the deflection process. At the same time, the second guiding portion 21 deflects away from the central axis direction of the socket 2, and the second guiding portion provides a space for the deflection of the steel pipe to prevent the end of the socket 2 from being extruded during the deflection process of the steel pipe and ensure the integrity of the socket 2. The flexible joint of the steel pipe in the present application provides degrees of freedom in the radial and axial directions of the steel pipe, that is, while ensuring the sealing performance of the flexible joint, the steel pipe can move axially and deflect radially, solving the technical problem of the lack of flexibility of the steel pipe joint and ensuring that the problems such as foundation settlement and thermal expansion and contraction can be overcome during the service process of the pipeline.
[0034] Preferably, the distances from the second guiding portion 21, the sealing groove 22, and the redundant groove 23 to the central axis of the socket 2 are all greater than the outer diameter of the socket 1, that is, after the socket 1 and the socket 2 are installed, there are gaps between the second guiding portion 21, the sealing groove 22, and the redundant groove 23 and the socket 1. When the diameters of the pipes where the socket 1 and the socket 2 are located are the same, the second guiding portion 21, the sealing groove 22, and the redundant groove 23 are all arranged on the side of the pipe wall away from the central axis, and only the regions where the second guiding portion 21, the sealing groove 22, and the redundant groove 23 are located protrude from the pipe, so that the inner cavity of the connected pipe is continuous to ensure the normal flow of fluid.
[0035] For a further optimized solution, the sealing groove 22 includes a first sealing surface 221 and a second sealing surface 222. The first sealing surface 221 is arranged on the side close to the first end, and the distance between the first sealing surface 221 and the central axis of the socket 2 gradually increases from the first end to the second end; the second sealing surface 222 is arranged on the side close to the second end, and the distance between the second sealing surface 222 and the central axis of the socket 2 gradually decreases from the first end to the second end. The distance between the position where the first sealing surface 221 and the second sealing surface 222 are in contact and the central axis of the socket 2 is the first distance, that is, the distance between the bottom of the sealing groove 22 and the central axis of the socket 2; the distance between other positions of the sealing groove 22 and the central axis of the socket 2 is the second distance. With such a setting, the first distance is greater than all the second distances, and the sealing surface formed by the first sealing surface 221 and the second sealing surface 222 is a curved surface. While reducing the forming difficulty of the sealing groove 22, the sealing ring 3 can be arranged between the sealing groove 22 and the spigot 1 to prevent the spigot 1 from pushing the sealing ring 3 into the redundant groove 23 or further inside during the process of inserting the spigot 1 into the socket 2.
[0036] In this solution, the distance between the second guiding portion 21 and the central axis of the socket 2 gradually decreases from the first end to the second end, and the second guiding portion 21 becomes a flared opening. The distance between the redundant groove 23 and the central axis of the socket 2 first gradually increases and then gradually decreases from the first end to the second end until the distance is the same as the inner diameter of the pipeline where it is located. The gradually increasing section is arranged on the side close to the first end. Such an arrangement provides a deflection space for the deflection of the first guiding portion 11, while the section gradually decreasing to the inner diameter limits the movement distance of the spigot 1 in the socket 2. In the initial state, the end of the insertion end of the spigot 1 is arranged between the two axial ends of the redundant groove 23, providing a movement space for the elongation and shortening of the pipeline due to thermal expansion and contraction, that is, the redundant groove 23 provides a redundancy for the elongation and contraction of the steel pipeline.
[0037] Preferably, the angle between the first sealing surface 221 and the central axis of the socket 2 is the first angle, and the first angle is between 20° and 45°. The angle between the second sealing surface 222 and the central axis of the socket 2 is the second angle, and the second angle is between 35° and 60°, and the second angle is greater than the first angle. In this embodiment, both the first sealing surface 221 and the second sealing surface 222 are curved surfaces. The first angle mentioned in this embodiment is the angle between the connecting line of the two ends of the first sealing surface 221 and the central axis; the second angle is the angle between the connecting line of the two ends of the second sealing surface 222 and the central axis. In this embodiment, the second angle is set to be greater than the first angle, that is, the slope of the second sealing surface 222 is greater than that of the first sealing surface 221, which can effectively limit the movement of the sealing ring 3 and prevent the spigot 1 from pushing the sealing ring 3 into the redundant groove 23 or further inside during the process of inserting the spigot 1 into the socket 2.
[0038] In this solution, the larger the first angle and the second angle are, the more obvious the restrictive effect of the sealing groove 22 on the sealing ring 3 is. However, the forming difficulty of the sealing groove 22 is greater and the cost is higher. Therefore, the first angle is preferably 30°, and the second angle is preferably 45°. That is, the angle between the second sealing surface 222 and the central axis of the socket 2 is preferably 45°. The second sealing surface 222 can effectively prevent the movement of the sealing ring 3. At the same time, the forming difficulty of the sealing groove 22 is also within a controllable range within this angle range, achieving a balance between the two.
[0039] In a further optimized solution, due to the extrusion of the sealing groove 22 and the socket 1, the sealing ring 3 undergoes elastic deformation. One side of the sealing ring 3 close to the socket 2 contacts the first sealing surface 221 and the second sealing surface 222, and the side of the sealing ring 3 close to the socket 1 contacts it. During the insertion of the socket 1 into the socket 2, the socket 1 extrudes the sealing ring 3, and the sealing groove 22 restricts the sealing ring 3 from moving radially outward. As a result, the sealing ring 3 undergoes elastic deformation, and both sides of the sealing ring 3 contact the sealing groove 22 and the socket 2 respectively, thus achieving the sealing effect between the socket 1 and the socket 2. Moreover, when the steel pipe translates axially and rotates radially, the elastic deformation of the sealing ring 3 changes, and it can continuously play the sealing role between the socket 1 and the socket 2.
[0040] In this solution, a pressure-bearing groove 31 is provided on the side of the deformed sealing ring 3 facing the second end. This pressure-bearing groove 31 can be a pressure-bearing groove generated after the elastic deformation of the sealing ring 3, or a structure that the sealing ring 3 itself has. When the pipeline is filled with high-pressure fluid inside, the high-pressure fluid moves to the vicinity of the sealing ring 3 through the gap between the socket 1 and the socket 2. The high-pressure fluid exerts pressure on the sealing ring 3, causing the sealing ring 3 to deform in the direction pointing to the first end. However, due to the restrictive effect of the first sealing surface 221, the sealing ring 3 cannot move out of the sealing groove 22 and the socket 1, thereby promoting the sealing ring to deform towards the sealing groove 22 and the socket 1, further increasing the sealing pressure between the sealing ring 3 and the first sealing surface 221 as well as the contact surface of the socket 1, and further enhancing the sealing effect of the sealing ring 3. In this embodiment, the sealing ring 3 has a pressure-bearing groove 31 structure. When the sealing ring 3 undergoes elastic deformation, the pressure-bearing groove 31 provides a certain deformation space for the deformation of the sealing ring 3, facilitating the installation of the sealing ring 3. In some embodiments, the position where the second guiding portion 21 contacts the sealing groove 22 is the first loop. The cross-section of the side of the sealing ring 3 close to the first end is triangular, facilitating the sealing of the gap between the first loop and the socket 1 by the sealing ring 3. At the same time, the hardness of the sealing ring material on the side of the sealing ring 3 close to the first end is greater than the hardness of the sealing ring material on the side of the sealing ring 3 close to the second end, reducing the deformation of the part of the sealing ring 3 close to the first end and preventing the sealing ring 3 from moving out of the gap between the first loop and the socket 1. Of course, the sealing ring 3 in this embodiment can also be a sealing ring with an elliptical cross-section, and the sealing effect is better.
[0041] The present invention also discloses a pipeline, which includes a plurality of pipeline bodies 6 arranged in sequence. The adjacent pipeline bodies 6 are inserted into each other, and a flexible steel pipeline joint is formed between the adjacent pipeline bodies 6. The pipeline body 6 is a steel pipeline. To facilitate the distinction of the connection relationship, the adjacent pipeline bodies 6 are respectively a first pipe body and a second pipe body. The interface of the first pipe body is a socket 1, and the interface of the second pipe body is a socket 2. During the installation process, the sealing ring 3 is arranged in the sealing groove 22 of the socket 2. After the socket 1 and the socket 2 are aligned, the socket 1 is inserted into the interior of the socket 2 from the first end, and the first guiding portion 11 and the redundant groove 23 are arranged opposite to each other, completing the installation work of the flexible pipeline joint. Due to the existence of the flexible steel pipeline joint in this application, degrees of freedom are provided for the radial and axial directions of the pipeline. That is, while ensuring the sealing performance of the flexible joint, the steel pipeline can move axially and deflect radially, solving the technical problem of the lack of flexibility in the steel pipeline joint and ensuring that the pipeline can overcome problems such as foundation settlement and thermal expansion and contraction during its service life.
[0042] In this embodiment, the transmission pipeline is a general term for existing terms in the art such as straight pipe, long straight pipe, pipeline, etc. The main function of the transmission pipeline is to transmit the fluid inside the pipeline. The connecting pipeline is a general term for existing terms in the art such as pipe fittings and pipeline connectors. The main function of the connecting pipeline is to connect and conduct adjacent transmission pipelines. In the art, the length of the transmission pipeline is much greater than the length of the connecting pipeline. There are various arrangement situations for the pipeline disclosed in this embodiment:
[0043] The first situation: all the pipeline bodies 6 are transmission pipelines, and one end of the pipeline body 6 is a socket 1 and the other end is a socket 2. All the pipeline bodies 6 are arranged according to socket-socket or socket-socket, and all the pipeline bodies 6 are inserted into each other in sequence to complete the pipeline installation work.
[0044] The second situation: all the pipeline bodies 6 are transmission pipelines, but the pipeline bodies 6 are divided into two types. One type of pipeline body 6 has sockets 2 at both ends, and the other type of pipeline body 6 has sockets at both ends. After the two types of pipelines are arranged alternately, all the pipeline bodies 6 are inserted into each other in sequence to complete the pipeline installation work.
[0045] The third case: The pipe body 6 includes a transmission pipe 61 and a connecting pipe 62. The connecting pipe 62 is arranged between two adjacent transmission pipes 61. Both ends of the connecting pipe 62 are socket ends 2, and one end of the transmission pipe 61 close to the connecting pipe 62 is a spigot end 1. In this case, two adjacent transmission pipes 61 are connected by the connecting pipe 62. Compared with the first case and the second case, only simple operations need to be performed on both ends of the transmission pipe 61 to form the first guiding portion 11, and then the two ends of the connecting pipe 62 are mainly formed. Moreover, since the length of the transmission pipe is much greater than that of the connecting pipe, the weight and length of the transmission pipe 61 are both greater than those of the connecting pipe 62. Therefore, compared with the transmission pipe 61, the connecting pipe 62 is easier to move and position control. The transmission pipe 61 and the connecting pipe 62 are classified for operation, reducing the production difficulty of the transmission pipe 61 and the connecting pipe 62.
[0046] The fourth case: The pipe body 6 includes a transmission pipe 61 and a connecting pipe 62. The connecting pipe 62 is arranged between two adjacent transmission pipes 61. Both ends of the connecting pipe 62 are spigot ends 1, and one end of the transmission pipe 61 close to the connecting pipe 62 is a socket end 2. Compared with the third case, it is necessary to mainly form the two ends of the transmission pipe 61, but the length and weight of the transmission pipe 61 are much greater than those of the connecting pipe 62, and it is difficult to operate during the forming of the pipe end.
[0047] In the third case and the fourth case, according to the difference of the connecting pipe 62, it can be further divided into straight-line transmission and deflection transmission. Straight-line transmission means that two adjacent transmission pipes 61 are on the same central axis, and the connecting pipe 62 is also straight; Deflection transmission means that there is a certain included angle between the central axes of two adjacent transmission pipes 61, and the connecting pipe 62 is a curved or bent structure, realizing pipe deflection. The above four cases can be used for water supply.
[0048] Preferably, the pipe can also be used for heat supply or heating, called a heat supply pipe. A first heat insulation layer 41 and a first protective layer 42 are sequentially arranged on the radial outer side of the pipe body 6. The heat supply pipe disclosed in the present invention is formed by connecting the above pipe bodies 6 to form a pipe, and a first heat insulation layer 41 and a first protective layer 42 are sequentially arranged on the radial outer side of the pipe. The first heat insulation layer 41 insulates the pipe and the fluid inside it, and the first protective layer 42 protects the first heat insulation layer 41 and the pipe, preventing groundwater, soil moisture and other factors from eroding the first heat insulation layer 41 and the pipe. The heat insulation layer can adopt heat insulation materials such as foamed polyurethane, and the protective layer can adopt PE pipes or steel pipes, etc.
[0049] In this embodiment, the first thermal insulation layer 41 and the first protective layer 42 can be installed in two stages. In the first case, after the pipeline is installed, the first thermal insulation layer 41 and the first protective layer 42 are uniformly installed on the outer side of the pipeline without distinguishing between the pipeline itself and the flexible joint of the steel pipeline.
[0050] Preferably, the pipeline itself and the flexible joint of the steel pipeline are distinguished, and different structures are installed at different positions. The second thermal insulation layer 43 and the second protective layer 44 are sequentially arranged on the radial outer side of the flexible joint of the steel pipeline, and the first protective layer 42 and the second protective layer 44 are fixedly connected; a flexible thermal insulation layer 45 is arranged at the flexible joint of the steel pipeline. One side of the flexible thermal insulation layer 45 abuts against the pipeline body 6, and the side of the flexible thermal insulation layer 45 facing away from the pipeline body 6 abuts against the first protective layer 42 and / or the second protective layer 44. Here, the abutment is close contact. When the pipeline body 6 is produced, after the socket 1 and the socket 2 of the pipeline body 6 are formed, the first thermal insulation layer 41 and the first protective layer 42 are fixed on the outer side of the pipeline body 6, but the first thermal insulation layer 41 and the first protective layer 42 do not cover the socket 1 and the socket 2. After the pipeline body 6 is installed, the flexible thermal insulation layer 45 is installed at the flexible joint of the steel pipeline, and then the second thermal insulation layer 43 and the second protective layer 44 are installed to complete the installation work of the heat supply pipeline. In this application, the pipeline itself and the flexible joint of the steel pipeline are distinguished. When the pipeline itself is produced, the first thermal insulation layer 41 and the first protective layer 42 are pre-installed. During the on-site installation, only the installation of the pipeline body 6 and the thermal insulation work on the outer side of the flexible joint of the steel pipeline need to be completed, reducing the on-site construction volume and improving the installation efficiency of the thermal insulation pipeline.
[0051] In this solution, due to the existence of the flexible joint of the steel pipeline, in order to ensure the continuity of the outer side of the heat supply pipeline and the thermal insulation effect of the second thermal insulation layer 43, the thickness of the second thermal insulation layer 43 needs to be controlled. The second thermal insulation layer 43 can use a thermal insulation material with better thermal insulation effect, that is, the material of the second thermal insulation layer 43 is better than that of the first thermal insulation layer. The first protective layer 42 and the second protective layer 44 in this embodiment need to be fixedly connected. The first protective layer 42 and the second protective layer 44 can use PE materials. When the two are installed, the interface of the first protective layer 42 and the second protective layer 44 is heated by hot melting, and after cooling, the two are integrated into one body to complete the fixed connection, ensuring the sealing performance of the connection between the two. In this embodiment, the first thermal insulation layer 41, the first protective layer 42, the second thermal insulation layer 43, the second protective layer 44 and the flexible thermal insulation layer 45 all use flexible or elastic materials, ensuring that when the steel pipeline moves axially and deflects radially, the thermal insulation layer and the protective layer on the outer side of the pipeline can undergo elastic deformation without being damaged, and improving the service life of the thermal insulation pipeline.
[0052] Refer to Figures 9-10, the present invention also discloses a production device for flexible joints of steel pipes, including a socket production device for producing sockets. The socket production device includes a pressure roller 51, an outer mold 52 and a driving mechanism; the working end of the pressure roller 51 is provided with a forming working surface, and the socket working surface formed by the second guiding portion 21, the sealing groove 22 and the redundant groove 23 is adapted to the forming working surface; the outer mold 52 is arranged on the radially outer side of the pressure roller 51, and the outer mold 52 and the pressure roller 51 are respectively arranged on both sides of the steel pipe to be processed. A protrusion for forming the outer wall curve of the socket 2 is arranged on the side of the outer mold close to the steel pipe to be processed; the driving mechanism includes a first rotating portion and a second rotating portion. The first rotating portion includes a first rotating element detachably connected to the pressure roller 51. Based on the rotation of the first rotating element, the pressure roller 51 is controlled to rotate around its own central axis. The second rotating driving portion includes a second rotating element detachably connected to the first rotating portion. Based on the rotation of the second rotating element, the first rotating portion and the pressure roller 51 are controlled to rotate around the central axis of the steel pipe to be processed.
[0053] During the operation of this embodiment, first, the end of the steel pipe to be processed is heated. The heated steel pipe to be processed is placed between the outer mold 52 and the pressure roller 51. The pressure roller 51 is controlled to rotate around its own central axis through the first rotating portion. Since the forming working surface of the pressure roller 51 is adapted to the designed socket working surface, and a protrusion for forming the outer wall curve of the socket 2 is arranged on the side of the outer mold close to the steel pipe to be processed, the outer mold supports the outer wall of the socket 2. The first rotating operation can form a certain area of the steel pipe to be processed. During the first rotation process, the first rotating portion and the pressure roller 51 are controlled to rotate around the central axis of the steel pipe to be processed through the second rotating driving portion, so that the pressure roller 51 can form the socket working surface of the steel pipe to be processed by 360 degrees. During the above forming process, the end of the steel pipe to be processed can be continuously heated to ensure the thermoplasticity of the end of the processed steel pipe. Based on the above operations, a forming working surface is formed at the working end of the steel pipe to be processed. Compared with other production devices, the present application can complete the socket production work through a small-sized pressure roller 51 and a driving mechanism, and the device has a simple structure and low cost.
[0054] In this embodiment, the first rotating element is the first rotating shaft. The first rotating shaft and the pressure roller 51 are detachably connected. The first rotating part further includes a first driving motor. The output shaft of the first driving motor and the first rotating shaft are detachably connected. The first driving motor drives the first rotating shaft and the pressure roller 51 to rotate, and the rotation axis is the central axis of the pressure roller 51. The second rotating element is the first rotating frame. The first rotating frame is rotatably connected to the first rotating shaft. The second rotating part includes a circular second rotating frame. The second rotating frame is of a disc-shaped structure. The first rotating frame is slidably connected to the second rotating frame. The sliding direction of the first rotating frame is the radial direction of the second rotating frame. A hydraulic cylinder is connected between the first rotating frame and the first rotating frame. The hydraulic cylinder drives the first rotating frame to slide in the sliding direction to control the distance between the pressure roller 51 and the outer mold 52. The second rotating frame is driven by a motor to rotate, thereby controlling the first rotating frame and the pressure roller 51 to rotate around the central axis of the steel pipe to be processed. The outer mold 52 can adopt an integrated protrusion adapted to the curve of the outer wall of the socket 2, or can adopt a protrusion composed of several supporting annular plates. In this embodiment, the outer mold 52 supports the steel pipe to be processed through several supporting annular plates.
[0055] The description of the above embodiments is only used to help understand the method and its core idea of the present application; at the same time, for those of ordinary skill in the art, according to the idea of the present application, there will be changes in the specific implementation manner and application scope. In summary, the content of this specification should not be construed as a limitation to the present application.
[0056] It should be understood that the term " / and / or" used herein is only a relational description of the associated objects, indicating that three relationships may exist. For example, A and / or B may represent: A exists alone, A and B exist simultaneously, and B exists alone. In addition, the character " / " in this article generally represents an "or" relationship between the associated objects before and after.
[0057] In the description of the present invention, it should be understood that the orientation or positional relationship indicated by the terms "longitudinal", "transverse", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present invention, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation to the present invention.
[0058] The above-described embodiments are only descriptions of the preferred embodiments of the present invention, and do not limit the scope of the present invention. Without departing from the design spirit of the present invention, various deformations and improvements made by those of ordinary skill in the art to the technical solutions of the present invention shall fall within the protection scope determined by the claims of the present invention.
Claims
1. A flexible joint for a steel pipe, characterized in that, Comprising: A socket (1), at the end of the pipe wall of the socket (1), a first guiding portion (11) is provided, and the first guiding portion (11) contracts towards the central axis direction of the socket (1); A socket (2), the socket (2) is provided with a first end and a second end arranged oppositely, and the socket (1) can be inserted into the socket (2) from the first end; from the first end to the second end of the pipe wall of the socket (2), a second guiding portion (21), a sealing groove (22) and a redundant groove (23) arranged in a ring shape are sequentially provided; the second guiding portion (21) expands towards the direction away from the central axis of the socket (2); a radial gap for accommodating the deflection of the first guiding portion (11) and an axial gap for accommodating the axial movement of the first guiding portion (11) are provided between the first guiding portion (11) and the redundant groove (23); A sealing ring (3), the sealing ring (3) is detachably connected between the sealing groove (22) and the socket (1); the pipes where the socket (1) and the socket (2) are located are steel pipes.
2. The flexible joint of the steel pipe according to claim 1, wherein, The distances from the second guiding portion (21), the sealing groove (22) and the redundant groove (23) to the central axis of the socket (2) are all greater than the outer diameter of the socket (1).
3. The flexible joint of the steel pipe according to claim 1, characterized in that, The sealing groove (22) includes a first sealing surface (221) and a second sealing surface (222), the first sealing surface (221) is arranged on the side close to the first end, and the distance from the first sealing surface (221) to the central axis of the socket (2) gradually increases from the first end to the second end; the second sealing surface (222) is arranged on the side close to the second end, and the distance from the second sealing surface (222) to the central axis of the socket (2) gradually decreases from the first end to the second end.
4. The flexible joint of the steel pipe according to claim 3, wherein The angle between the first sealing surface (221) and the central axis of the socket (2) is a first angle, the first angle is between 20° and 45°, the angle between the second sealing surface (222) and the central axis of the socket (2) is a second angle, the second angle is between 35° and 60°, and the second angle is greater than the first angle.
5. The flexible joint of the steel pipe according to claim 3, characterized in that Based on the extrusion between the sealing groove (22) and the socket (1), the sealing ring (3) generates elastic deformation, the side of the sealing ring (3) close to the socket (2) contacts the first sealing surface (221) and the second sealing surface (222), and the side of the sealing ring (3) close to the socket (1) contacts it.
6. A pipeline, characterized in that, Comprising a plurality of pipe bodies (6) arranged in sequence, adjacent pipe bodies (6) are inserted into each other, and a flexible interface of a steel pipe as described in any one of claims 1-5 is formed between adjacent pipe bodies (6).
7. The pipeline according to claim 6, characterized in that, The pipe body (6) includes a transmission pipe (61) and a connecting pipe (62), the connecting pipe (62) is arranged between two adjacent transmission pipes (61), both ends of the connecting pipe (62) are sockets (2), and one end of the transmission pipe (61) close to the connecting pipe (62) is a socket (1).
8. The pipeline according to claim 6, characterized in that, A first thermal insulation layer (41) and a first protective layer (42) are sequentially arranged on the radial outer side of the pipeline body (6).
9. The pipeline according to claim 8, characterized in that, A second thermal insulation layer (43) and a second protective layer (44) are sequentially arranged on the radial outer side of the flexible interface of the steel pipe, and the first protective layer (42) and the second protective layer (44) are fixedly connected; a flexible thermal insulation layer (45) is arranged at the flexible interface of the steel pipe, one side of the flexible thermal insulation layer (45) is in contact with the pipe body (6), and the side of the flexible thermal insulation layer (45) facing away from the pipe body (6) is in contact with the first protective layer (42) and / or the second protective layer (44).
10. A production device for flexible joints of steel pipes, characterized in that, A socket production device for producing a socket as claimed in any one of claims 1 to 5, the socket production device comprising: A pressure roller (51), wherein a working end of the pressure roller (51) is provided with a forming working surface, and a socket working surface formed by the second guide portion (21), the sealing groove (22) and the redundant groove (23) is adapted to the forming working surface; an outer mold (52), the outer mold (52) being arranged radially outside the pressing roller (51), and the outer mold (52) and the pressing roller (51) being arranged on both sides of the steel pipe to be processed, and a protrusion for forming an outer wall curve of the socket (2) being arranged on a side of the outer mold close to the steel pipe to be processed; The driving mechanism comprises a first rotating part and a second rotating part, wherein the first rotating part comprises a first rotating element detachably connected to the pressure roller (51), and based on the rotation of the first rotating element, the pressure roller (51) is controlled to rotate around its own central axis; the second rotating driving part comprises a second rotating element detachably connected to the first rotating part, and based on the rotation of the second rotating element, the first rotating part and the pressure roller (51) are controlled to rotate around the central axis of the steel pipe to be processed.