Pipe connecting structure
By using the internal thread connection between the rotating body and the socket, and the limiting structure, the problem of insufficient axial tensile strength in PVC-U pipe connections is solved, achieving efficient sealing and improved tensile performance.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- JIANGXI LIANSU TECH IND CO LTD
- Filing Date
- 2025-06-11
- Publication Date
- 2026-05-01
AI Technical Summary
Existing PVC-U pipe connection methods are insufficient in terms of axial tensile strength. Traditional adhesive bonding and elastic sealing ring connections cannot provide sufficient axial tensile strength and cannot meet the requirements of QB/T2568.
The rotator is connected to the socket by its internal thread, and the external thread of the rotator is connected to the internal thread of the socket. Combined with the sealing element and the limiting structure, the axial tensile strength and sealing performance of the pipe connection are improved.
It improves the axial tensile strength and sealing performance of pipe connections, enhancing the stability and durability of pipe connections.
Smart Images
Figure CN224188253U_ABST
Abstract
Description
A pipe connection structure Technical Field
[0001] This utility model relates to the technical field of pipe connection, and more specifically, to a pipe connection structure. Background Technology
[0002] PVC-U water supply pipes are widely used in municipal water supply and drainage, featuring lightweight, high strength, corrosion resistance, and long service life. Trenchless construction technology eliminates the need for road excavation, minimizing impact on road traffic and the construction environment. Horizontal directional drilling, in particular, offers advantages such as fast laying speed and long single-crossing distances for new pipelines, and is currently the primary construction method for urban pipe networks. However, this method places high demands on the axial tensile strength of the pipes and their joints. Traditional PVC pipe connections primarily rely on adhesive bonding or elastic sealing rings. While these methods can effectively withstand internal pressure requirements during pipe use, they lack sufficient axial tensile strength. QB / T2568 requires adhesive bonding strength to be only ≥6.2MPa, meaning the joints cannot provide adequate axial tensile strength. Summary of the Invention
[0003] The purpose of this invention is to overcome the shortcomings of the weak axial tensile strength in the prior art and to provide a pipe connection structure that can improve the axial tensile strength at the pipe connection.
[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, wherein the spigot is inserted into the socket, a sealing element is installed between the socket and the spigot, and a rotating body is also provided, wherein the rotating body is sleeved on the spigot, the relative position of the rotating body and the spigot in the axial direction of the rotating body is fixed, the outer wall of the rotating body is provided with an external thread, the inner wall of the socket is provided with an internal thread that mates with the external thread, and the rotating body is threadedly connected to the socket.
[0006] The pipe connection structure of this utility model involves installing a sealing element in the socket and fitting a rotating body onto the spigot when connecting pipes. The spigot and rotating body are then inserted into the socket. When the external thread of the rotating body contacts the internal thread of the socket, rotating the rotating body causes the external and internal threads to rotate relative to each other, moving the rotating body deeper into the socket and consequently the spigot. Tightening the rotating body completes the installation. At this point, the sealing element eliminates the gap between the socket and the spigot, achieving a seal. The axial relative position of the rotating body and the spigot is fixed, and the rotating body is connected to the socket via the engagement of the external and internal threads, improving the axial tensile strength of the connection structure.
[0007] Furthermore, one end of the rotating body inserted into the socket is provided with a guide section for guiding the rotating body into the socket. The guide section allows for easier insertion of the rotating body into the socket.
[0008] Furthermore, the rotating body provides a wrench between the inserted end of the socket and the external thread, and the outer wall of the wrench has several limiting planes. When the rotating body and the socket are inserted into the socket, and the external thread contacts the internal thread, the wrench is engaged on the limiting plane of the wrench, and the wrench is turned, making the rotating body rotate more easily, reducing installation difficulty and improving installation efficiency.
[0009] Furthermore, the sealing element is a sealing ring. After the spigot is installed in the socket, the outer wall of the spigot and the inner wall of the socket together compress the sealing ring, eliminating the gap between the spigot and the socket and improving the sealing performance; the sealing ring has a long service life and is suitable for a wide range of environments.
[0010] Furthermore, the inner wall of the rotating body is provided with a first connecting part, and the outer wall of the socket is provided with a second connecting part. The first connecting part and the second connecting part are rotatably connected, and the rotation axes of the first connecting part and the second connecting part coincide with the axis of the rotating body. During installation, the rotating body is fitted onto the socket, and the rotating body is moved to align the first connecting part with the second connecting part, connecting the first connecting part and the second connecting part. Since the first connecting part and the second connecting part are rotatably connected, the rotating body and the socket can only rotate relative to each other, and the axial relative position of the rotating body and the socket is fixed, improving the axial tensile strength of the connection structure. The rotatable connection between the rotating body and the socket also prevents the socket from rotating with the rotating body, reducing the friction between the socket and the seal, thereby reducing the resistance encountered by the rotating body when rotating.
[0011] Furthermore, the first connecting part is a positioning ring, and the second connecting part is a positioning groove that mates with the positioning ring, with the positioning ring engaging with the positioning groove. During installation, the rotating body is placed on the socket, and the rotating body is moved to engage the positioning ring with the positioning groove. The positioning ring and the positioning groove are engaged and connected, fixing the axial relative position of the rotating body and the socket, thereby improving the axial tensile strength of the pipe connection.
[0012] Furthermore, the socket includes an interconnected socket section and a sealing section. The inner diameter of the socket section is equal to the outer diameter of the rotating body. The internal thread is provided on the inner wall of the socket section, and a sealing groove is provided on the inner wall of the sealing section. The sealing element is installed in the sealing groove. When the sealing element is installed in the sealing groove, the rotating body and the socket are inserted into the socket. The socket passes through the socket section and the sealing section in sequence, and the sealing element eliminates the gap between the socket and the sealing section, thus achieving a seal.
[0013] Furthermore, the socket also includes a limiting section, which is connected to the end of the sealing section away from the socket section. The maximum inner diameter of the limiting section is greater than the outer diameter of the socket, and the minimum inner diameter of the limiting section is smaller than the outer diameter of the socket. The inner diameter of the limiting section gradually decreases in the direction away from the sealing section, and the end face of the socket abuts against the limiting section. Rotating the rotating body moves the rotating body and the socket deeper into the socket until the socket abuts against the limiting section, completing the installation. The limiting section provides axial limiting for the socket.
[0014] Furthermore, the end of the socket that inserts into the receptacle has a chamfer tangent to the inner wall of the limiting section. The chamfer on the socket makes it easier for the socket to move towards the limiting section. When the rotating body is tightened, the diameter of the contact point between the inner wall of the limiting section and the socket is smaller, resulting in a smaller gap between the socket and the inner wall of the limiting section and better sealing.
[0015] Furthermore, the wall thicknesses of the socket section, the sealing section, and the limiting section are equal. Equal wall thicknesses in all parts of the socket reduce stress concentration and extend its service life.
[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 axial relative position of the rotating body and the socket is fixed, and the rotating part and the socket are connected by external thread and internal thread, which improves the axial tensile strength of the pipe connection; 2. By locking the positioning ring and the positioning groove, the axial relative position of the rotating body and the socket is restricted, which improves the axial compressive strength of the pipe connection. Attached Figure Description
[0018] Figure 1 is a schematic diagram of the first structure of the pipe connection structure of this utility model;
[0019] Figure 2 is a schematic diagram of the second structure of the pipe connection structure of this utility model;
[0020] Figure 3 is a schematic diagram of the third structure of the pipe connection structure of this utility model;
[0021] Figure 4 is a schematic diagram of the socket structure of the pipe connection structure of this utility model;
[0022] Figure 5 is a schematic diagram of the socket structure of the pipe connection structure of this utility model;
[0023] Figure 6 is a schematic diagram of the rotating body of the pipe connection structure of this utility model;
[0024] Figure 7 is a schematic diagram of the assembly structure of the socket and the rotating body of the pipe connection structure of this utility model.
[0025] In the attached diagram: 1. Socket; 11. Socket section; 111. Internal thread; 12. Sealing section; 13. Straight section; 14. Limiting section; 2. Insert; 21. Chamfer; 22. Positioning groove; 3. Rotating body; 31. External thread; 32. Positioning ring; 33. Lever; 34. Guide section; 4. Seal. Detailed Implementation
[0026] 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.
[0027] 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.
[0028] Example 1
[0029] Figures 1 to 7 show an embodiment of the pipe connection structure of this utility model, including a socket 1 and a spigot 2. The spigot 2 is inserted into the socket 1. A sealing element 4 is installed between the socket 1 and the spigot 2. The structure also includes a rotating body 3, which is sleeved on the spigot 2. The relative positions of the rotating body 3 and the spigot 2 in the axial direction of the rotating body 3 are fixed. The outer wall of the rotating body 3 is provided with an external thread 31. The inner wall of the socket 1 is provided with an internal thread 111 that mates with the external thread 31. The rotating body 3 is threadedly connected to the socket 1.
[0030] In this utility model's pipe connection structure, when connecting pipes, the sealing element 4 is installed in the socket 1, the rotating body 3 is sleeved on the spigot 2, and the spigot 2 and the rotating body 3 are inserted into the socket 1. When the external thread 31 of the rotating body 3 contacts the internal thread 111 of the socket 1, the rotating body 3 is rotated, and the external thread 31 and the internal thread 111 rotate relative to each other. The rotating body 3 moves deeper into the socket 1, driving the spigot 2 to move deeper into the socket 1. The rotating body 3 is then tightened to complete the installation, as shown in Figure 3. At this time, the sealing element 4 eliminates the gap between the socket 1 and the spigot 2, achieving a seal, as shown in Figure 1. The axial relative position of the rotating body 3 and the spigot 2 is fixed, and the rotating body and the socket 1 are connected by the external thread 31 and the internal thread 111, which improves the axial tensile strength of the pipe connection.
[0031] As shown in Figures 2 and 6, one end of the rotating body 3 that is inserted into the socket 1 is provided with a guide section 34 for guiding the rotating body 3 into the socket 1. The guide section 34 makes it easier to insert the rotating body 3 into the socket 1.
[0032] As shown in Figure 6, a wrench 33 is provided between the end of the rotating body 3 into which the socket 2 is inserted and the external thread 31. The outer wall of the wrench 33 has several limiting planes. When the rotating body 3 and the socket 2 are inserted into the socket 1, and the external thread 31 contacts the internal thread 111, the wrench is engaged on the limiting planes of the wrench 33. Turning the wrench makes rotating the rotating body 3 easier, or the rotating body 3 can be twisted by gripping two or more limiting planes of the wrench 33, reducing installation difficulty and improving installation efficiency. The wrench 33 has eight limiting planes, which are evenly distributed on the outer circumference of the wrench 33 and are symmetrical with respect to the axis.
[0033] As shown in Figures 1 and 2, the sealing element 4 is a sealing rubber ring. After the spigot 2 is installed in the socket 1, the outer wall of the spigot 2 and the inner wall of the socket 1 together compress the sealing rubber ring, eliminating the gap between the spigot 2 and the socket 1 and improving the sealing performance; the sealing rubber ring has a long service life and is applicable to a wide range of environments.
[0034] The working principle of the pipe connection structure in this embodiment is as follows: When connecting pipes, the sealing ring is installed in the socket 1, the rotating body 3 is fitted onto the spigot 2, and the spigot 2 and the rotating body 3 are inserted into the socket 1. During the insertion of the rotating body 3 into the socket 1, if the guide section 34 of the rotating body 3 contacts the opening of the socket 1, the guide section 34 guides the rotating body 3, making it easier for the rotating body 3 to be inserted into the socket 1. When the external thread 31 of the rotating body 3 contacts the internal thread 111 of the socket 1, the wrench is placed on the two parallel limiting planes of the wrench handle 33. The wrench is turned, causing the rotating body 3 to rotate, which drives the external thread 31 and the internal thread 111 to rotate relative to each other. The rotating body 3 moves deeper into the socket 1, which in turn drives the spigot 2 to move deeper into the socket 1. The spigot 2 passes through the sealing ring, and the rotating body 3 is tightened to complete the installation, as shown in Figure 2. The outer wall of the spigot 2 and the inner wall of the socket 1 jointly squeeze the sealing ring to eliminate the gap between the socket 1 and the spigot 2, thus achieving a seal, as shown in Figure 1.
[0035] Example 2
[0036] This embodiment is a second embodiment of the pipe connection structure of this utility model. This embodiment is similar to the first embodiment, except that, as shown in Figures 5 and 6, the inner wall of the rotating body 3 is provided with a first connecting part, and the outer wall of the socket 2 is provided with a second connecting part. The first connecting part and the second connecting part are rotatably connected, and the rotation axes of the first connecting part and the second connecting part coincide with the axis of the rotating body 3. During installation, the rotating body 3 is fitted onto the socket 2, and the rotating body 3 is moved to align the first connecting part with the second connecting part, connecting the first connecting part and the second connecting part. Since the first connecting part and the second connecting part are rotatably connected, the rotating body 3 and the socket 2 can only rotate relative to each other. The axial relative position of the rotating body 3 and the socket 2 is fixed, which improves the axial tensile strength at the pipe connection. The rotatable connection between the rotating body 3 and the socket 2 also reduces the amplitude of the rotation of the socket 2 with the rotating body 3, reducing the friction between the socket 2 and the sealing element 4, thereby reducing the resistance encountered by the rotating body 3 when rotating.
[0037] The first connecting part is a positioning ring 32, and the second connecting part is a positioning groove 22 that mates with the positioning ring 32. The positioning ring 32 and the positioning groove 22 are engaged. During installation, the rotating body 3 is placed on the socket 2, and the rotating body 3 is moved to engage the positioning ring 32 into the positioning groove 22. The positioning ring 32 and the positioning groove 22 are engaged and connected, fixing the axial relative position of the rotating body 3 and the socket 2, thereby improving the axial tensile strength of the pipe connection, as shown in Figure 7.
[0038] The working principle of the pipe connection structure in this embodiment is as follows: When connecting pipes, the rotating body 3 is fitted onto the socket 2. The rotating body 3 is moved to engage the positioning ring 32 into the positioning groove 22, as shown in Figure 7. This allows the rotating body 3 to be rotatably connected to the socket 2. The rotating body 3 and the socket 2 can only rotate relative to each other, and the axial relative position of the rotating body 3 and the socket 2 is fixed, thereby improving the axial tensile strength at the pipe connection. The socket 2 and the rotating body 3 are then inserted into the socket 1, and the external thread 31 of the rotating body 3 and the internal thread 11 of the socket 1 are connected. When contact is made, the wrench is placed on the wrench handle 33 of the rotating body 3. The rotating body 3 is rotated, and the rotating body 3 moves deeper into the socket 1, which in turn moves the spigot 2 deeper into the socket 1. Since the spigot 2 is rotatably connected to the rotating body 3, the spigot 2 rotates with the rotating body 3 with a smaller amplitude. At the same time, frictional force parallel to the axis is generated between the spigot 2 and the sealing element 4, while reducing the magnitude of the circumferential frictional force on the spigot 2, the magnitude of the resistance encountered by the rotating body 3 when rotating is reduced. When the rotating body 3 is tightened, the pipe connection is completed.
[0039] Example 3
[0040] This embodiment is the third embodiment of the pipe connection structure of this utility model. This embodiment is similar to embodiment two, except that, as shown in Figure 4, the socket 1 includes a socket section 11 and a sealing section 12 connected to each other. The inner diameter of the socket section 11 is equal to the outer diameter of the rotating body 3. The internal thread 111 is provided on the inner wall of the socket section 11. The inner wall of the sealing section 12 is provided with a sealing groove, and the sealing element 4 is installed in the sealing groove. When the sealing element 4 is installed in the sealing groove, the rotating body 3 and the spigot 2 are inserted into the socket 1. The spigot 2 passes through the socket section 11 and the sealing section 12 in sequence. The sealing element 4 eliminates the gap between the spigot 2 and the sealing section 12, thereby achieving a seal.
[0041] The socket 1 also includes a limiting section 14, which is connected to the end of the sealing section 12 away from the socket section 11. The maximum inner diameter of the limiting section 14 is greater than the outer diameter of the spigot 2, and the minimum inner diameter of the limiting section 14 is smaller than the outer diameter of the spigot 2. The inner diameter of the limiting section 14 gradually decreases in the direction away from the sealing section 12. The end face of the spigot 2 abuts against the limiting section 14. Rotating the rotating body 3 moves the rotating body 3 and the spigot 2 deeper into the socket 1 until the spigot 2 abuts against the limiting section 14, completing the installation. The limiting section 14 provides axial limiting for the spigot 2.
[0042] In this embodiment, a straight section 13 is also connected between the limiting section 14 and the sealing section 12, and the inner wall of the straight section 13 is parallel to the inner wall of the socket section 11.
[0043] As shown in Figures 1 and 5, the end of the socket 2 that inserts into the socket 1 has a chamfer 21 that is tangent to the inner wall of the limiting section 14. The chamfer 21 on the socket 2 makes it easier for the socket 2 to move towards the limiting section 14. When the rotating body 3 is tightened, the diameter of the contact point between the inner wall of the limiting section 14 and the socket 2 is smaller, resulting in a smaller gap between the socket 2 and the inner wall of the limiting section 14, and better sealing.
[0044] In this embodiment, the wall thicknesses of the socket section 11, sealing section 12, straight section 13, and limiting section 14 are equal. Equal wall thicknesses in all parts of the socket 1 reduce stress concentration and extend the service life of the socket 1.
[0045] The working principle of the pipe connection structure of this utility model in this embodiment is as follows: When connecting pipes, the sealing element 4 is installed in the sealing groove, the positioning ring 32 of the rotating body 3 is inserted into the positioning groove 22 of the socket 2, the rotating body 3 and the socket 2 are inserted into the socket 1, the wrench is locked on the wrench handle 33, the rotating body 3 is rotated, the rotating body 3 and the socket 2 move deeper into the socket 1, the socket 2 passes through the socket section 11, the sealing section 12, the straight section 13 and the limiting section 14 in sequence until the rotating body 3 is tightened, the chamfer 21 of the socket 2 abuts against the inner wall of the limiting section 14, and the installation is completed, as shown in Figures 1 and 2; the sealing element 4 installed in the sealing groove eliminates the gap between the outer wall of the socket 2 and the sealing groove, improving the sealing performance, and the limiting section 14 restricts the opposite movement of the socket 2 and the socket 1 in the axial direction.
[0046] 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.
[0047] 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, comprising a socket (1) and a spigot (2), wherein the spigot (2) is inserted into the socket (1), and a sealing element (4) is installed between the socket (1) and the spigot (2), characterized in that, It also includes a rotating body (3), which is sleeved on the socket (2). The relative position of the rotating body (3) and the socket (2) in the axial direction of the rotating body (3) is fixed. The outer wall of the rotating body (3) is provided with an external thread (31), and the inner wall of the socket (1) is provided with an internal thread (111) that mates with the external thread (31). The rotating body (3) is threadedly connected to the socket (1).
2. The pipe connection structure according to claim 1, characterized in that, The end of the rotating body (3) inserted into the socket (1) is provided with a guide section (34) for guiding the rotating body (3) into the socket (1).
3. The pipe connection structure according to claim 1, characterized in that, The rotating body (3) provides a lever (33) between one end of the insertion port (2) and the external thread (31), and the outer wall of the lever (33) is provided with several limiting planes.
4. The pipe connection structure according to claim 1, characterized in that, The sealing element (4) is a sealing rubber ring.
5. The pipe connection structure according to any one of claims 1 to 4, characterized in that, The inner wall of the rotating body (3) is provided with a first connecting part, and the outer wall of the socket (2) is provided with a second connecting part. The first connecting part and the second connecting part are rotatably connected, and the rotation axes of the first connecting part and the second connecting part coincide with the axis of the rotating body (3).
6. The pipe connection structure according to claim 5, characterized in that, The first connecting part is a positioning ring (32), and the second connecting part is a positioning groove (22) that cooperates with the positioning ring (32). The positioning ring (32) is engaged with the positioning groove (22).
7. The pipe connection structure according to claim 1, characterized in that, The socket (1) includes a socket section (11) and a sealing section (12) connected to each other. The inner diameter of the socket section (11) is equal to the outer diameter of the rotating body (3). The internal thread (111) is provided on the inner wall of the socket section (11). The inner wall of the sealing section (12) is provided with a sealing groove. The sealing element (4) is installed in the sealing groove.
8. The pipe connection structure according to claim 7, characterized in that, The socket (1) further includes a limiting section (14), which is connected to the end of the sealing section (12) away from the socket section (11). The maximum inner diameter of the limiting section (14) is greater than the outer diameter of the socket (2), and the minimum inner diameter of the limiting section (14) is less than the outer diameter of the socket (2). The inner diameter of the limiting section (14) gradually decreases in the direction away from the sealing section (12), and the end face of the socket (2) abuts against the limiting section (14).
9. The pipe connection structure according to claim 8, characterized in that, The end of the socket (2) that is inserted into the socket (1) has a chamfer (21) that is tangent to the inner wall of the limiting section (14).
10. The pipe connection structure according to claim 9, characterized in that, The wall thicknesses of the socket section (11), the sealing section (12), and the limiting section (14) are equal.