Pipe connecting structure
By using an interference fit and guide bevel design, combined with an inlet section and slot structure, the problem of unstable pipe connection is solved, achieving stable connection and convenient operation, and improving the sealing and flow capacity of the pipe.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-02-18
- Publication Date
- 2026-04-07
AI Technical Summary
The existing pipe connection structure has unstable pipe gaps during construction, which can easily lead to deformation due to tensile forces, affecting the connection quality and sealing performance.
The first and second interlocking parts adopt an interference fit, combined with a guide bevel design, to achieve stable connection and disassembly of the pipe. The inlet section and the slot structure ensure a solid connection between the spigot and the socket and convenient operation.
It achieves stability and sealing of pipe gaps, reduces flow resistance, avoids pipe deformation and damage, and improves the convenience of construction and the reliability of connections.
Smart Images
Figure CN224094052U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of pipe connection technology, and more specifically, to a pipe connection structure. Background Technology
[0002] High-density polyethylene (HDPE) kraft pipe is a flexible pipe manufactured using a hot-winding process. The pipe is hot-winded, resulting in a smooth inner surface and a spiral "O" ribbed outer surface. The pipe structure and socket are integrally molded, ensuring reliable connections. With the continuous upgrading of intelligent pipeline systems, the requirements for pipeline construction are becoming increasingly stringent. Projects demand higher connection quality, sealing performance, and ease of connection for pipe joints. Existing pipe connection structures suffer from problems such as unstable internal gaps due to pipe collisions during construction, excessive gaps between pipes affecting flow resistance, and conventional pipe connection structures relying on pulling the pipe body to achieve a socket connection. Excessive tension can easily deform or even damage the pipe. Utility Model Content
[0003] The purpose of this invention is to overcome the instability of the internal gap between pipes in the prior art and to provide a pipe connection structure that can keep the gap between pipes stable.
[0004] To solve the above-mentioned technical problems, the technical solution adopted by this utility model is as follows:
[0005] A pipe connection structure is provided, including a socket and a spigot. The outer periphery of the spigot is provided with a plurality of first fastening parts, and the inner periphery of the socket is provided with a plurality of second fastening parts that are interference-fitted with the first fastening parts. The first fastening parts and the second fastening parts are interlocked with each other. The first fastening parts are provided with first guide slopes on both sides of the spigot axis, which serve as guides. The second fastening parts are provided with second guide slopes on both sides of the spigot axis, which cooperate with the first guide slopes.
[0006] The pipe connection structure of this utility model allows for pipe connection by inserting the spigot into the socket, causing the first and second interlocking parts to engage and complete the connection. The first and second guide slopes work together to guide the connection, making it easier for the first and second interlocking parts to engage or disengage without damage, thus facilitating pipe installation and disassembly. Due to the interference fit between the first and second interlocking parts, the connection between them does not loosen due to pipe movement, ensuring the stability of the pipe's internal clearance and socket position, and stabilizing the flow resistance at the pipe connection. The internal clearance between the pipes is the axial clearance between the socket and the spigot.
[0007] Furthermore, both the first and second fastening portions are provided with at least two sets. Providing at least two sets of the first and second fastening portions ensures that there are at least two sets of fastening positions between the spigot and the socket, making the connection between the spigot and the socket more secure and the internal clearance between the pipes more stable.
[0008] Furthermore, the radial cross-section of the first fastening part is trapezoidal, and the base angle of the radial cross-section of the first fastening part near the spigot axis is less than 90°. The two sides of the trapezoidal structure are first guide slopes. Since the radial cross-section of the first fastening part is a trapezoid with an acute base angle, both sides of the first fastening part in the spigot axis direction play a guiding role, making it easier for the first fastening part to engage with or disengage from the second fastening part, and less prone to damage, thus facilitating the spigot and socket installation and disassembly of the pipe.
[0009] Furthermore, the radial cross-section of the first fastening part is corrugated. The two sides of the corrugated structure are first guide slopes. The corrugated radial cross-section of the first fastening part makes both sides of the first fastening part in the direction of the spigot axis play a guiding role, making it easier for the first fastening part to fasten with or detach from the second fastening part, and less prone to damage, thus facilitating the spigot and socket installation and disassembly of the pipe.
[0010] Furthermore, a first guide section is provided on the outer periphery of the inlet end of the socket, and the diameter of the first guide section gradually increases from the inlet of the socket along the axial direction of the socket. The first guide section serves to guide the socket, making it easier for the socket to be inserted into the socket.
[0011] Furthermore, the inner circumference of the socket is provided with a guide surface for connection with the pipe. The maximum diameter of the guide surface is larger than the diameter of the pipe. The taper of the first inlet section is equal to the taper of the guide surface. When the first fastening part is connected to the second fastening part, the first inlet section abuts against the guide surface. The equal taper of the pipe with the first inlet section and the guide surface, and their mutual abutment, allows for a tighter fit between the spigot and the socket. Simultaneously, it makes the insertion of the spigot into the socket smoother, allowing it to be inserted deeper into the socket, effectively reducing the axial gap between the spigot and the socket, i.e., reducing the internal gap between the pipes, lowering the flow resistance coefficient, and improving the water flow capacity.
[0012] Furthermore, a second guide section is provided on the inner circumference of the inlet end of the socket, and the diameter of the second guide section gradually decreases from the inlet of the socket along the axial direction of the socket. The second guide section serves to guide the spigot, making it easier for the spigot to be inserted into the socket.
[0013] Furthermore, it also includes a sealing ring. A sealing groove is provided on the outer periphery of the socket, and the sealing ring is installed in the sealing groove. The inner and outer sides of the sealing ring abut against the sealing groove and the inner periphery of the socket, respectively. The sealing ring ensures a tight seal between the socket and the spigot, preventing leakage.
[0014] Furthermore, a second groove is provided on the outer periphery of the socket, and a first groove is provided on the outer periphery of the spigot. When performing insertion and insertion operations on the spigot and socket, a disassembly / removal tool with telescopic control function is installed on the second and first grooves. By applying force to the second and first grooves, the installation and disassembly of the pipe are completed. Only the socket and spigot need to be operated on, thus avoiding damage to the pipe structure when stretching the pipe body.
[0015] Furthermore, at least two sets of first retaining grooves are provided on the outer periphery of the socket. Providing at least two sets of first retaining grooves allows for more even force distribution on the socket, ensuring parallel movement of the pipes during connection.
[0016] Compared with the prior art, the beneficial effects of this utility model are:
[0017] The pipe connection structure of this utility model is as follows: 1. The socket and spigot are connected by an interference fit between the first and second interlocking parts, stabilizing the internal gap between the pipes; 2. By making the radial cross-section of the first interlocking part a trapezoid with an acute base angle, the first interlocking part can be more easily engaged and disengaged from the second interlocking part, avoiding damage to the spigot and facilitating the disassembly and assembly of the pipes; 3. A first guide section is provided on the spigot, with the taper of the first guide section equal to that of the guide surface of the socket, reducing the internal gap between the pipes and lowering the flow resistance of the pipeline system; 4. The insertion and spigot operation is completed by applying force to the second groove on the socket and the first groove on the spigot, avoiding damage to the pipe structure when pulling the pipe body. Attached Figure Description
[0018] Figure 1 This is a first structural schematic diagram of the pipe connection structure of this utility model;
[0019] Figure 2 This is a schematic diagram of the second structure of the pipe connection structure of this utility model;
[0020] Figure 3 This is a schematic diagram of the third structure of the pipe connection structure of this utility model;
[0021] Figure 4 This is a fourth structural diagram of the pipe connection structure of this utility model;
[0022] Figure 5 This is a first schematic diagram of the assembly method of the pipe connection structure of this utility model;
[0023] Figure 6 This is a second schematic diagram of the assembly method of the pipe connection structure of this utility model.
[0024] In the attached diagram: 1. Insert; 11. First engaging part; 12. First guide section; 13. First slot; 2. Socket; 21. Second engaging part; 22. Second guide section; 23. Guide surface; 24. Second slot; 3. Disassembly / assembly tool; 31. Drive motor; 32. First screw; 33. Second screw; 34. Insert retaining plate; 35. Socket retaining plate; 4. Sealing ring. Detailed Implementation
[0025] The present invention will be further described below with reference to specific embodiments. The accompanying drawings are for illustrative purposes only, representing schematic diagrams rather than actual physical objects, and should not be construed as limiting the scope of this patent. To better illustrate the embodiments of the present invention, some components in the drawings may be omitted, enlarged, or reduced, and do not represent the actual dimensions of the product. It is understandable to those skilled in the art that some well-known structures and their descriptions may be omitted in the drawings.
[0026] In the accompanying drawings of this utility model, the same or similar reference numerals correspond to the same or similar components. In the description of this utility model, it should be understood that if terms such as "upper," "lower," "left," and "right" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, they are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, the terms used to describe positional relationships in the drawings are only for illustrative purposes and should not be construed as limiting this patent. For those skilled in the art, the specific meaning of the above terms can be understood according to the specific circumstances.
[0027] Example 1
[0028] like Figures 1 to 3 The first embodiment of the pipe connection structure of this utility model is shown, including a socket 2 and a spigot 1. The outer periphery of the spigot 1 is provided with a plurality of first fastening parts 11, and the inner periphery of the socket 2 is provided with a plurality of second fastening parts 21 that are interference fit with the first fastening parts 11. The first fastening parts 11 and the second fastening parts 21 are interlocked with each other. The first fastening parts 11 are provided with first guide slopes on both sides of the spigot 1 in the axial direction, and the second fastening parts 21 are provided with second guide slopes on both sides of the socket 2 in the axial direction, which cooperate with the first guide slopes.
[0029] In this utility model, the pipe connection structure involves inserting the spigot 1 into the socket 2 during pipe connection, causing the first engaging part 11 and the second engaging part 21 to engage with each other, thus completing the connection. The first guide slope and the second guide slope work together to guide the connection, making it easier for the first engaging part 11 and the second engaging part 21 to engage or disengage without easily causing damage, facilitating the installation and disassembly of the pipe. Due to the interference fit between the first engaging part 11 and the second engaging part 21, the connection between them does not loosen due to pipe movement, keeping the internal gap between the pipes and the socket position of the pipes stable and ensuring stable flow resistance at the pipe connection. The internal gap between the pipes is the axial gap between the spigot 1 and the socket 2.
[0030] The number of first engaging parts 11 and second engaging parts 21 that can achieve a stable connection between the socket 1 and the receptacle 2 can be either suitable for this utility model. For example, if a set of first engaging parts 11 and second engaging parts 21 is provided, such as... Figure 4 As shown, the number of the first fastening part 11 and the second fastening part 21 listed in this embodiment is not intended to limit the present invention. Both the first fastening part 11 and the second fastening part 21 are provided in at least two sets. Providing at least two sets of the first fastening part 11 and the second fastening part 21 ensures that there are at least two sets of fastening positions between the spigot 1 and the socket 2, making the connection between the spigot 1 and the socket 2 more stable and the internal gap between the pipes more stable.
[0031] Both the first fastening part 11 and the second fastening part 21, which enable the spigot 1 and the socket 2 to engage with each other, are applicable to this utility model. For example, the first fastening part 11 can be a concave fastening and the second fastening part 21 a convex fastening. The first fastening part 11 and the second fastening part 21 listed in this embodiment are not intended to limit this utility model. In this embodiment, the first fastening part 11 is a convex fastening and the second fastening part 21 is a concave fastening, with the first fastening part 11 inserted into the second fastening part 21. When connecting pipes, the spigot 1 is inserted into the socket 2, and the first fastening part 11 is inserted into the second fastening part 21, completing the connection between the first fastening part 11 and the second fastening part 21, thus completing the spigot and socket connection of the pipes.
[0032] like Figures 1 to 3 As shown, the radial cross-section of the first engaging part 11 is trapezoidal, and the base angle of the radial cross-section of the first engaging part 11 near the axis of the socket 1 is less than 90°. The two sides of the trapezoidal structure are first guide slopes. Because the radial cross-section of the first engaging part 11 is a trapezoid with an acute base angle, both sides of the first engaging part 11 in the axial direction of the socket 1 serve a guiding function, making it easier for the first engaging part 11 to engage with or disengage from the second engaging part 21, reducing the risk of damage, and facilitating the socketing and disassembly of the pipe. In this embodiment, the apex angle of the radial cross-section of the first engaging part 11 is rounded, further enhancing the guiding effect of the axial sides of the first engaging part 11.
[0033] In addition, the radial section of the first fastening part 11 can also be crest-shaped, in which case the two sides of the crest-shaped structure are the first guide slopes.
[0034] In this embodiment, as Figure 1 and Figure 3 As shown, the outer periphery of the socket 1 is provided with two first fastening parts 11, and the inner periphery of the socket 2 is provided with two second fastening parts 21.
[0035] like Figure 2 As shown, it also includes a sealing ring 4. A sealing groove is provided on the outer periphery of the socket 1, and the sealing ring 4 is installed in the sealing groove. The inner and outer sides of the sealing ring 4 abut against the sealing groove and the inner periphery of the socket 2, respectively. The sealing ring 4 ensures the seal between the socket 2 and the socket 1, preventing leakage. In this embodiment, both first engaging parts are located on the side of the sealing groove away from the socket inlet, such as... Figure 1 As shown, in addition to the above, the two fastening parts can also be distributed on both sides of the sealing groove, such as... Figure 3 As shown.
[0036] In this embodiment, after the pipe is wound and formed, the processing of the socket 2 and spigot 1 is carried out after the pipe has been fully cooled. The pipe is processed offline, while the socket 2 and spigot 1 are precision machined using CNC machine tools, ensuring dimensional stability. The forming of the socket 2, spigot 1, first fastening part 11, and second fastening part 21 are all performed using a rotating device and die cutter internally supported within the pipe. This effectively avoids the impact of mold non-roundness on the inner surface of the socket 1, improving waterproof performance.
[0037] The working principle of the pipe connection structure in this embodiment is as follows: When connecting pipes, the spigot 1 of one pipe is inserted into the socket 2 of another pipe, so that the two first fastening parts 11 of the spigot 1 respectively engage with the two second fastening parts 21 of the socket 2. The first fastening parts 11 and the second fastening parts 21 are interference-fitted, so that the first fastening parts 11 and the second fastening parts 21 can be firmly connected and will not loosen due to the swing of the pipes, so that the gap between the pipes and the spigot position of the pipes remain stable. During the process of inserting the spigot 1 into the pipe, the first fastening part 11 near the inlet of the spigot 1 first engages with the second fastening part 21 near the inlet of the socket 2. As the spigot 1 continues to move, since the radial cross section of the first fastening part 11 is a trapezoid with an acute angle at the base, the first fastening part 11 is closer to the spigot 1 along the axial direction. The side near the inlet of spigot 1 acts as a guide, allowing the first engaging part 11 near the inlet of spigot 1 to easily disengage from the second engaging part 21 near the inlet of socket 2 without damage. It continues to move until it engages with the second engaging part 21 away from the inlet of socket 2. At this point, the first engaging part 11 away from the inlet of spigot 1 engages with the second engaging part 21 near the inlet of socket 2. Thus, the two first engaging parts 11 of spigot 1 are engaged with the two second engaging parts 21 of socket 2, completing the spigot-and-socket connection of the pipe. When the pipe needs to be separated, spigot 1 is withdrawn from socket 2. At this time, the side of the first engaging part 11 away from the inlet of spigot 1 along the axial direction of spigot 1 acts as a guide, allowing the first engaging part 11 to easily disengage from the second engaging part 21 without damage.
[0038] Example 2
[0039] This embodiment is the second embodiment of the pipe connection structure of this utility model. This embodiment is similar to the first embodiment, except that a first guide section 12 is provided on the outer periphery of the inlet end of the spigot 1. The diameter of the first guide section 12 gradually increases from the inlet of the spigot 1 along the axial direction of the spigot 1. The first guide section 12 serves to guide the socket 2, making it easier for the spigot 1 to be inserted into the socket 2.
[0040] like Figure 1 and Figure 2 As shown, the inner circumference of the socket 2 is provided with a guide surface 23 for connecting with the pipe. The maximum diameter of the guide surface 23 is larger than the diameter of the pipe. The taper of the first inlet section 12 is equal to the taper of the guide surface 23. When the first fastening part 11 and the second fastening part 21 are connected, the first inlet section 12 abuts against the guide surface 23. The pipe, the first inlet section 12, and the guide surface 23 have equal tapers and abut against each other, which can make the spigot 1 and the socket 2 fit more tightly. At the same time, it can make the process of inserting the spigot 1 into the socket 2 smoother and can be inserted deeper into the socket 2, effectively reducing the axial gap between the spigot 1 and the socket 2, that is, reducing the internal gap between the pipes, reducing the flow resistance coefficient, and improving the water flow capacity.
[0041] As the spigot 1 penetrates the socket 2, the first inlet section 12 and the guide surface 23 move relative to each other. Since the tapers of the first inlet section 12 and the guide surface 23 are equal and they abut against each other, the internal clearance between the pipes will change continuously with the continuous change of the relative position of the first inlet section 12 and the guide surface 23. By reasonably designing the positions of the first fastening part 11 and the second fastening part 21, the relative position of the first inlet section 12 and the second inlet section 22 can be changed, thereby changing the axial clearance between the spigot 1 and the socket 2 and accurately controlling the internal clearance between the pipes.
[0042] like Figure 1 and Figure 2 As shown, a second guide section 22 is provided on the inner circumference of the inlet end of the socket 2. The diameter of the second guide section 22 gradually decreases from the inlet of the socket 2 along the axial direction of the socket 2. The second guide section 22 serves to guide the spigot 1, making it easier for the spigot 1 to be inserted into the socket 2.
[0043] The working principle of the pipe connection structure in this embodiment is as follows: When connecting pipes, the spigot 1 is inserted into the socket 2. When the first inlet section 12 and the second inlet section 22 come into contact, the first inlet section 12 and the second inlet section 22 play a guiding role for the spigot 1 and the socket 2, making it easier for the spigot 1 to be inserted into the socket 2 and easier to connect pipes with similar diameters. When the first inlet section 12 comes into contact with the guide surface 23, the first inlet section 12 fits against the guide surface 23, making it easier for the spigot 1 to be inserted into a deeper position in the socket 2, reducing the internal gap between the pipes and reducing flow resistance.
[0044] Example 3
[0045] This embodiment is the third embodiment of the pipe connection structure of this utility model. This embodiment is similar to Embodiment Two, except that... Figure 1 and Figure 2 As shown, a second retaining groove 24 is provided on the outer periphery of the socket 2, and a first retaining groove 13 is provided on the outer periphery of the insertion port 1. When performing insertion / retention operations on the insertion port 1 and the socket 2, as follows... Figure 3 As shown, the disassembly and assembly tool 3 with telescopic control function is installed on the second slot 24 and the first slot 13. By applying force to the second slot 24 and the first slot 13, the installation and disassembly of the pipe can be completed. Only the socket 2 and the spigot 1 need to be operated, which can avoid damaging the pipe structure when stretching the pipe body.
[0046] like Figure 1 and Figure 2 As shown, at least two sets of first retaining grooves 13 are provided on the outer periphery of the socket 2. Providing at least two sets of first retaining grooves 13 can make the force on the socket 2 more even and ensure parallel movement of the pipe during connection.
[0047] Any disassembly and assembly tool 3 capable of driving the socket 2 and insert 1 through the second slot 24 and the first slot 13 to complete the insertion and insertion operation can be applied to this utility model, such as hydraulic cylinders, servo motors, etc. The disassembly and assembly tool 3 listed in this embodiment is not intended to limit this utility model. In this embodiment, such as Figure 5 and Figure 6 As shown, the disassembly and assembly tool 3 is a screw structure, including a drive motor 31, a first screw 32, a second screw 33, a spigot retaining plate 34, and a socket retaining plate 35. The drive motor 31 has two output ends, which are fixedly connected to the first screw 32 and the second screw 33 respectively. The external threads of the first screw 32 and the second screw 33 are in opposite directions. The spigot retaining plate 34 is threadedly connected to the first screw 32, and the socket retaining plate 35 is threadedly connected to the second screw 33. When performing spigot and socket operations on the pipe, the spigot retaining plate 34 is inserted into the first retaining groove 13, and the socket retaining plate 35 is inserted into the second retaining groove 24.
[0048] The working principle of the pipe connection structure in this embodiment is as follows: 1. Insert the spigot retainer 34 into the first retainer groove 13 and the socket retainer 35 into the second retainer groove 24, thereby installing the disassembly and assembly tool 3 on the pipe connection structure, such as... Figure 5 As shown; 2. Start the drive motor 31. The drive motor 31 drives the first screw 32 and the second screw 33 to rotate. The first screw 32 drives the socket clamping plate 34 to move horizontally, and the second screw 33 drives the socket clamping plate 35 to move horizontally. Since the external threads of the first screw 32 and the second screw 33 are in opposite directions, the movement directions of the socket clamping plate 34 and the socket clamping plate 35 are in opposite directions, thereby driving the socket 1 and the socket 2 to move towards each other, so that the first fastening part 11 on the outer periphery of the socket 1 engages with the second fastening part 21 on the inner periphery of the socket 2, as shown. Figure 6 As shown; 3. When it is necessary to separate the pipes at both ends, install the disassembly tool 3 in the second slot 24 and the first slot 13, so that the drive motor 31 reverses and causes the spigot plate 34 and the socket plate 35 to move in opposite directions, applying opposite forces to the spigot 1 and the socket 2, so that the first fastening part 11 disengages from the second fastening part 21 until the spigot 1 and the socket 2 are completely separated.
[0049] The pipe connection structure in this embodiment is simple to operate and does not require large equipment when performing the socketing operation; only the socket 2 and spigot 1 are stretched, which can prevent stretching the pipe body from damaging the pipe structure.
[0050] In the specific implementation of the above embodiments, the technical features can be combined in any non-contradictory way. For the sake of brevity, not all possible combinations of the above technical features are described. However, as long as the combination of these technical features is not contradictory, it should be considered to be within the scope of this specification.
[0051] Obviously, the above embodiments of this utility model are merely examples for clearly illustrating this utility model, and are not intended to limit the implementation of this utility model. Those skilled in the art can make other variations or modifications based on the above description. It is neither necessary nor possible to exhaustively describe all embodiments here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this utility model should be included within the protection scope of the claims of this utility model.
Claims
1. A pipe connection structure, characterized in that, The socket (2) includes a socket (2) and a insertion port (1). The outer periphery of the insertion port (1) is provided with a plurality of first fastening parts (11). The inner periphery of the socket (2) is provided with a plurality of second fastening parts (21) that are interference fit with the first fastening parts (11). The first fastening parts (11) and the second fastening parts (21) are interlocked. The first fastening parts (11) are provided with first guide slopes on both sides of the insertion port (1) in the axial direction, and the second fastening parts (21) are provided with second guide slopes on both sides of the socket (2) in the axial direction, which cooperate with the first guide slopes.
2. The pipe connection structure according to claim 1, characterized in that, Both the first fastening part (11) and the second fastening part (21) are provided with at least two sets.
3. The pipe connection structure according to claim 1, characterized in that, The radial cross section of the first fastening part (11) is trapezoidal, and the base angle of the radial cross section of the first fastening part (11) near the axis of the socket (1) is less than 90°.
4. The pipe connection structure according to claim 1, characterized in that, The radial cross section of the first fastening part (11) is wave-shaped.
5. The pipe connection structure according to claim 1, characterized in that, The outer periphery of the socket (2) is provided with a second slot (24), and the outer periphery of the insertion port (1) is provided with a first slot (13).
6. The pipe connection structure according to claim 5, characterized in that, At least two sets of second slots (24) are provided on the outer periphery of the socket (2).
7. The pipe connection structure according to claim 1, characterized in that, The inlet end of the socket (1) is provided with a first inlet section (12), and the diameter of the first inlet section (12) gradually increases from the inlet of the socket (1) along the axial direction of the socket (1).
8. The pipe connection structure according to claim 5, characterized in that, The inner circumference of the socket (2) is provided with a guide surface (23) for connecting with the pipe. The maximum diameter of the guide surface (23) is greater than the diameter of the pipe. The taper of the first inlet section (12) is equal to the taper of the guide surface (23). When the first fastening part (11) is connected to the second fastening part (21), the first inlet section (12) abuts against the guide surface (23).
9. The pipe connection structure according to claim 1, characterized in that, The inlet end of the socket (2) is provided with a second inlet section (22), the diameter of which gradually decreases from the inlet of the socket (2) along the axial direction of the socket (2).
10. The pipe connection structure according to claim 1, characterized in that, It also includes a sealing ring (4), and a sealing groove is provided on the outer periphery of the socket (1). The sealing ring (4) is installed in the sealing groove, and the inner and outer sides of the sealing ring (4) abut against the sealing groove and the inner periphery of the socket (2), respectively.