A telescopic joint

Abstract

The utility model relates to pipeline connection technical field more specifically, relate to a telescopic joint, including main part and sealing ring, the inner wall of main part is equipped with sealing groove, sealing ring is installed in sealing groove, still include a plurality of guide block for pressing pipeline, the main part includes the socket section, the flared section and the first connecting section connected in proper order, sealing groove sets up on the inner wall of flared section, the one end of first connecting section away from flared section is equipped with the limit slot, the outer wall of guide block is equipped with the limit rib, and the limit rib is inserted in the limit slot along the main part axis direction, through the limit rib is inserted into the limit slot, a plurality of guide blocks are inserted between the first connecting section and the pipeline, fill the clearance between the main part and the pipeline, press the pipeline tightly, limit the pipeline position, avoid the axial deviation between the pipeline and the main part, install another pipeline on the main part through the socket section, realize the connection of two section pipelines.

Description

Technical Field

[0001] This utility model relates to the field of pipe connection technology, and more specifically, to an expansion joint. Background Technology

[0002] Polyvinyl chloride (PVC) pipes are widely used in building water supply and drainage systems due to their significant advantages such as corrosion resistance, light weight, easy installation, and cost-effectiveness. Horizontal pipes play a crucial role in piping systems, such as drainage pipes in indoor ceilings. However, the inherently high coefficient of thermal expansion of PVC means that horizontal pipes experience significant axial expansion and contraction when the ambient temperature changes or the temperature of the transported medium fluctuates. This can lead to pipe deformation and loosening of joints, or even pipe rupture and leakage at connections, severely impacting the safety and service life of the piping system. Expansion joints are commonly used in the industry as a solution. These typically consist of an expansion joint body, a sealing ring, and an expansion joint cover, relying on the elastic deformation of the rubber ring to provide sealing and limited axial displacement compensation. However, with existing expansion joints, the pipe and expansion joint are prone to axial deflection during axial expansion and contraction. The greater the axial expansion and contraction of the pipe, the larger the axial deflection angle, affecting the sealing effect. Utility Model Content

[0003] The purpose of this invention is to overcome the shortcomings of existing technologies where pipes and expansion joints are prone to axial deflection, and to provide an expansion joint that can restrict the position of the pipe and prevent axial deflection between the pipe and the expansion joint.

[0004] To solve the above-mentioned technical problems, the technical solution adopted by this utility model is as follows: An expansion joint is provided, comprising a body and a sealing ring. The inner wall of the body is provided with a sealing groove, and the sealing ring is installed in the sealing groove. The expansion joint also includes a plurality of guide blocks for pressing the pipe. The body includes a socket section, a flared section and a first connecting section connected in sequence. The sealing groove is provided on the inner wall of the flared section. The end of the first connecting section away from the flared section is provided with a limiting groove. The outer wall of the guide blocks is provided with limiting ribs, and the limiting ribs are inserted into the limiting grooves along the axis of the body.

[0005] The expansion joint of this utility model has a sealing ring installed in a sealing groove. A section of pipe is inserted into the flared section through the first connecting section. The outer wall of the pipe and the sealing groove squeeze the sealing ring to improve the sealing performance. By inserting the limiting rib into the limiting groove, several guide blocks are inserted between the first connecting section and the pipe to fill the gap between the main body and the pipe, compressing the pipe, restricting the position of the pipe, and preventing axial displacement between the pipe and the main body. Another pipe is installed on the main body through the socket section to realize the connection of the two pipe sections.

[0006] Furthermore, it also includes a gland, the inner wall of which is connected to the outer wall of the main body, and the side of the gland facing the main body abuts against the guide block. When installing the guide block, the limiting rib is inserted into the limiting groove, causing the gland to move towards the flared section, pressing the guide block into the gap between the first connecting section and the pipe, connecting the inner wall of the gland to the outer wall of the first connecting section. By squeezing the guide block, the gland restricts the axial position of the guide block, preventing the guide block from falling off during pipe expansion and contraction, thus improving the connection reliability and stability of the overall structure.

[0007] Furthermore, the gland includes a pressure ring and a second connecting section. The second connecting section is located on the side of the pressure ring facing the main body. The pressure ring abuts against the guide block. The outer wall of the first connecting section has an external thread, and the inner wall of the second connecting section has an internal thread that mates with the external thread. The first connecting section and the second connecting section are threadedly connected. The length of the limiting rib is less than the depth of the limiting groove. The limiting rib is inserted into the limiting groove, and the second connecting section of the gland is fitted onto the first connecting section, so that the internal thread contacts the external thread. The gland is rotated, and the gland moves towards the flared section. The pressure ring of the gland presses the guide block into the gap between the first connecting section and the pipe until the gland is tightened. The gland completes the installation of the guide block by pressing the guide block. The length of the limiting rib is less than the depth of the limiting groove, which can prevent the guide block from being inserted too deeply into the first connecting section, thus preventing obstruction of the gland's screwing. Installing the gland through threaded engagement simplifies the operation and makes it easier to press the guide block into the gap between the first connecting section and the pipe.

[0008] Furthermore, a guide slope is provided on the inner wall of the first connecting section. The diameter of the guide slope gradually decreases in the direction away from the opening of the first connecting section. The outer surface of the guide block contacts the guide slope, and the slope is equal to that of the guide block. The outer surface of the guide block is the side of the guide block away from the pipe. The guide slope guides the guide block, making it easier for the guide block to be inserted into the gap between the first connecting section and the pipe. When the guide block moves along the guide slope under the push of the pressure cap, because the slope of the outer surface of the guide block is equal to that of the guide slope, the distance between the guide block and the axis of the first connecting section gradually shortens, gradually pressing the pipe.

[0009] Furthermore, multiple guide blocks are provided, and these guide blocks are evenly distributed along the circumference of the first connecting segment. The multiple guide blocks evenly distributed along the circumference of the first connecting segment collectively wrap around the pipe from multiple directions, ensuring balanced force on the pipe, avoiding pipe offset or tilting caused by unilateral force, ensuring the pipe's axis is aligned with the main body, and improving connection stability.

[0010] Furthermore, the limiting groove is a trapezoidal groove, and the limiting rib is a trapezoidal rib. The trapezoidal groove has good guiding properties, making it easier for the limiting rib to be inserted into the limiting groove, and allowing the limiting rib to be inserted deeper into the limiting groove.

[0011] Furthermore, the end of the guide block near the flared section abuts against the sealing ring. When installing the guide block, pressing it tightly against the sealing ring further improves the sealing performance of the expansion joint.

[0012] Furthermore, the sealing ring has an outer sealing surface and an inner sealing surface for abutting against the outer wall of the pipe. The outer sealing surface abuts against the sealing groove. The sealing ring also has a first elastic groove located between the outer sealing surface and the inner sealing surface. The first elastic groove enhances the overall elasticity and deformation capacity of the sealing ring, allowing it to deform when subjected to pressure from the guide block or pipe expansion and contraction. This ensures that the outer sealing surface and the inner sealing surface are tightly fitted against the sealing groove and the outer wall of the pipe, respectively, accommodating axial expansion and contraction of the pipe due to thermal expansion and contraction.

[0013] Furthermore, a second elastic groove is provided on the inner sealing surface. The second elastic groove provides elastic deformation space for the inner sealing surface. When the pipeline expands or contracts axially due to thermal expansion and contraction, the inner sealing surface can adapt to the displacement of the pipeline through the deformation of the second elastic groove, ensuring that the inner sealing surface is always in close contact with the outer wall of the pipeline, improving the sealing effect of the inner side of the sealing ring, avoiding sealing failure caused by pipeline expansion and contraction, and maintaining a long-term sealing effect.

[0014] Furthermore, a third elastic groove is provided on the outer sealing surface. The third elastic groove provides elastic deformation space for the outer sealing surface. When the guide block compresses the sealing ring, the outer sealing surface can fit tightly against the sealing groove of the main body through the deformation of the third elastic groove, enhancing the fit between the outer sealing surface and the sealing groove, improving the sealing effect on the outside of the sealing ring. At the same time, the third elastic groove can also buffer the compression pressure of the guide block, preventing the outer sealing surface from being damaged due to excessive compression and extending the service life of the sealing ring.

[0015] Compared with the prior art, the beneficial effects of this utility model are: The expansion joint of this utility model: 1. By inserting the limiting rib into the limiting groove, several guide blocks are inserted between the first connecting section and the pipe, filling the gap between the main body and the pipe, pressing the pipe tightly, restricting the pipe position, and preventing axial displacement between the pipe and the main body; 2. The first elastic groove enhances the overall elasticity and deformation capacity of the sealing ring. When the pipe elongates or shortens, it generates an axial force on the sealing ring, causing the first elastic groove to deform, ensuring that the outer sealing surface and the inner sealing surface are tightly fitted with the sealing groove and the outer wall of the pipe, respectively, to adapt to the axial expansion and contraction of the pipe due to thermal expansion and contraction; 3. When the pipe expands and contracts axially due to thermal expansion and contraction, the deformation of the second elastic groove adapts to the displacement of the pipe, ensuring that the inner sealing surface is always tightly fitted with the outer wall of the pipe, improving the sealing effect on the inner side of the sealing ring; 4. When the guide block squeezes the sealing ring, the outer sealing surface can be tightly fitted with the sealing groove of the main body through the deformation of the third elastic groove, improving the sealing effect on the outer side of the sealing ring. Attached Figure Description

[0016] Figure 1 This is an exploded view of the expansion joint structure of this utility model; Figure 2 This is an assembly diagram of the expansion joint of this utility model; Figure 3 This is a first structural schematic diagram of the main body of the expansion joint of this utility model; Figure 4 This is a second structural schematic diagram of the main body of the expansion joint of this utility model; Figure 5 This is a schematic diagram of the sealing ring structure of the expansion joint of this utility model; Figure 6 This is a schematic diagram of the guide block of the telescopic joint of this utility model; Figure 7 This is a schematic diagram of the structure of the expansion joint cover of this utility model.

[0017] In the attached diagram: 1. Socket section; 2. Flared section; 3. First connecting section; 31. External thread; 32. Limiting groove; 33. Guide slope; 4. Guide block; 41. Limiting rib; 42. Arc-shaped surface; 43. Arc-shaped rib; 5. Gland; 51. Pressure ring; 52. Second connecting section; 521. Internal thread; 522. Rotating rib; 6. Sealing ring; 61. Inner sealing surface; 611. Second elastic groove; 62. Outer sealing surface; 621. Third elastic groove; 63. First elastic groove; 7. Pipeline. Detailed Implementation

[0018] 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.

[0019] 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.

[0020] Example 1 like Figures 1 to 7 The diagram shows a first embodiment of the expansion joint of this utility model, including a main body and a sealing ring 6. A sealing groove is provided on the inner wall of the main body, and the sealing ring 6 is installed in the sealing groove. It also includes several guide blocks 4 for pressing the pipe 7. The main body includes a socket section 1, a flared section 2, and a first connecting section 3 connected in sequence. The sealing groove is provided on the inner wall of the flared section 2. A limiting groove 32 is provided at the end of the first connecting section 3 away from the flared section 2. Limiting ribs 41 are provided on the outer wall of the guide blocks 4, and the limiting ribs 41 are inserted into the limiting grooves 32 along the axis of the main body. In this embodiment, as shown... Figure 1 and Figure 3 As shown, the main body is made of PVC material. The socket section 1, the flared section 2, and the first connecting section 3 are integrally molded to ensure overall strength. The sealing ring 6 is made of rubber, which has good elasticity and sealing performance. Its outer diameter is matched with the size of the sealing groove to ensure that it is not easy to loosen after installation. Figure 6 As shown, the inner and outer surfaces of the guide block 4 are both partially cylindrical. An arc-shaped rib 43 is provided on the outer edge of the guide block 4 away from the flared section 2. The limiting rib 41 is perpendicular to and fixedly connected to the arc-shaped rib 43.

[0021] The expansion joint of this utility model has a sealing ring 6 installed in a sealing groove. A section of pipe 7 is inserted into the flared section 2 through the first connecting section 3. The outer wall of the pipe 7 and the sealing groove compress the sealing ring 6, improving the sealing performance. By inserting the limiting rib 41 into the limiting groove 32, several guide blocks 4 are inserted between the first connecting section 3 and the pipe 7, filling the gap between the main body and the pipe 7, pressing the pipe 7 tightly, restricting the position of the pipe 7, and preventing axial displacement between the pipe 7 and the main body. Figure 2 As shown; another pipe 7 is installed on the main body through the socket section 1 to connect the two pipe sections 7.

[0022] like Figure 1 and Figure 7 As shown, it also includes a pressure cap 5, the inner wall of which is connected to the outer wall of the main body, and the side of the pressure cap 5 facing the main body abuts against the guide block 4. When installing the guide block 4, the limiting rib 41 is inserted into the limiting groove 32, causing the pressure cap 5 to move towards the flared section 2, pressing the guide block 4 into the gap between the first connecting section 3 and the pipe 7, connecting the inner wall of the pressure cap 5 to the outer wall of the first connecting section 3. By squeezing the guide block 4, the pressure cap 5 restricts the axial position of the guide block 4, preventing the guide block 4 from falling off during the expansion and contraction of the pipe 7, thereby improving the connection reliability and stability of the overall structure.

[0023] The pressure cap 5 includes a pressure ring 51 and a second connecting section 52. The second connecting section 52 is located on the side of the pressure ring 51 facing the main body. The pressure ring 51 abuts against the guide block 4. The outer wall of the first connecting section 3 is provided with an external thread 31, and the inner wall of the second connecting section 52 is provided with an internal thread 521 that mates with the external thread 31. The first connecting section 3 and the second connecting section 52 are threadedly connected. The length of the limiting rib 41 is less than the depth of the limiting groove 32. Insert the limiting rib 41 into the limiting groove 32, and fit the second connecting section 52 of the pressure cap 5 onto the first connecting section 3, so that the internal thread 521 contacts the external thread 31. Rotate the pressure cap 5, and the pressure cap 5 moves towards the flared section 2. The pressure ring 51 of the pressure cap 5 presses the guide block 4 into the gap between the first connecting section 3 and the pipe 7 until the pressure cap 5 is tightened. The pressure cap 5 completes the installation of the guide block 4 by pressing the guide block 4. The length of the limiting rib 41 is less than the depth of the limiting groove 32, which can avoid the guide block 4 being inserted into the first connecting section 3 to the point of not being able to stop the screwing of the pressure cap 5. The pressure cap 5 is installed by threaded engagement, which is simple to operate and makes it easier to press the guide block 4 into the gap between the first connecting section 3 and the pipe 7. In this embodiment, multiple rotating ribs 522 are distributed on the outer wall of the second connecting section 52 to facilitate the rotation of the pressure cap 5.

[0024] The working principle of the expansion joint in this embodiment is as follows: The sealing ring 6 is installed in the sealing groove. A section of pipe 7 is inserted into the flared section 2 through the first connecting section 3, causing the outer wall of pipe 7 and the sealing groove to press against the sealing ring 6, eliminating the gap between the outer wall of pipe 7 and the sealing groove. The limiting rib 41 is inserted into the limiting groove 32. The second connecting section 52 of the pressure cap 5 is fitted onto the outer wall of the first connecting section 3, so that the internal thread 521 contacts the external thread 31. The pressure cap 5 is rotated, and the pressure cap 5 moves towards the flared section 2. The pressure ring 51 of the pressure cap 5 presses the guide block 4 into the gap between the first connecting section 3 and pipe 7 until the pressure cap 5 is tightened. The guide block 4 fills the gap between the main body and pipe 7, compressing pipe 7, restricting the position of pipe 7, and preventing axial displacement between pipe 7 and the main body. Figure 2 As shown; another pipe 7 is installed on the main body through the socket section 1 to connect the two pipe sections 7.

[0025] Example 2 This embodiment is the second embodiment of the expansion joint of this utility model. This embodiment is similar to the first embodiment, except that, as Figure 1 , Figure 3 and Figure 4As shown, a guide slope 33 is provided on the inner wall of the first connecting section 3. The diameter of the guide slope 33 gradually decreases in the direction away from the opening of the first connecting section 3. The outer surface of the guide block 4 contacts the guide slope 33, and the slope is equal. The outer surface of the guide block 4 is the side of the guide block 4 away from the pipe 7. The guide slope 33 plays a guiding role for the guide block 4, making it easier for the guide block 4 to be inserted into the gap between the first connecting section 3 and the pipe 7. When the guide block 4 moves along the guide slope 33 under the push of the pressure cap 5, because the slope of the outer surface of the guide block 4 is equal to that of the guide slope 33, the distance between the guide block 4 and the axis of the first connecting section 3 gradually shortens, gradually pressing the pipe 7.

[0026] like Figure 6 As shown, multiple guide blocks 4 are provided, and the multiple guide blocks 4 are evenly distributed along the circumference of the first connecting segment 3. The multiple guide blocks 4 evenly distributed along the circumference of the first connecting segment 3 jointly wrap around the pipe 7 from multiple directions, ensuring that the pipe 7 is subjected to balanced force, avoiding the pipe 7 from shifting or tilting due to unilateral force, ensuring that the axis of the pipe 7 is the same as that of the main body, and improving the connection stability. In this embodiment, the number of guide blocks 4 is four.

[0027] like Figure 4 and Figure 6 As shown, the limiting groove 32 is a trapezoidal groove, and the limiting rib 41 is a trapezoidal rib. The trapezoidal groove has good guiding properties, making it easier for the limiting rib 41 to be inserted into the limiting groove 32, and allowing the limiting rib 41 to be inserted deeper into the limiting groove 32.

[0028] The guide block 4, near the flared section 2, abuts against the sealing ring 6. Installing the guide block 4 and pressing it against the sealing ring 6 further improves the sealing performance of the expansion joint. The guide block 4, near the flared section 2, has an arc-shaped surface 42. This surface contact with the sealing ring 6 increases the contact area, allowing the pressure of the guide block 4 to be evenly transmitted to the sealing ring 6, preventing excessive local pressure from damaging the sealing ring 6 and extending its lifespan. Simultaneously, the arc-shaped surface 42 has a higher degree of contact with the curved surface of the sealing ring 6, accommodating the deformation of the sealing ring 6 after compression, ensuring that the guide block 4 remains in close contact with the sealing ring 6 and maintains a tight compression effect. The pressure applied by the guide block 4 to the sealing ring 6 can be adjusted by changing the tightness of the pressure cap 5, thus adjusting the sealing effect.

[0029] The working principle of the expansion joint in this embodiment is as follows: The sealing ring 6 is installed in the sealing groove, and a section of pipe 7 is inserted into the flared section 2 through the first connecting section 3, such as... Figure 2As shown, the outer wall of pipe 7 and the sealing groove squeeze the sealing ring 6 to eliminate the gap between the outer wall of pipe 7 and the sealing groove; four limiting ribs 41 evenly distributed along the circumference of the first connecting section 3 are inserted into the limiting groove 32; the second connecting section 52 of the pressure cap 5 is fitted onto the outer wall of the first connecting section 3, so that the internal thread 521 contacts the external thread 31; the pressure cap 5 is rotated, and the pressure cap 5 moves towards the flared section 2; the pressure ring 51 of the pressure cap 5 applies pressure to the guide block 4, so that the guide block 4 moves along the guide slope 33 towards the flared section 2 and inserts into the gap between the first connecting section 3 and pipe 7. Since the outer surface of the guide block 4 has the same slope as the guide slope 33, the distance between the guide block 4 and the axis of the first connecting section 3 gradually shortens during the movement along the guide slope 33, and the four guide blocks 4 tighten towards pipe 7 simultaneously from four directions; the pressure cap 5 is tightened, at which time the arc-shaped surface 42 at the end of the guide block 4 abuts against the sealing ring 6; another pipe 7 is installed on the main body through the socket section 1 to realize the connection of the two pipe sections 7.

[0030] Example 3 This embodiment is the third embodiment of the expansion joint of this utility model. This embodiment is similar to embodiment two, except that, as Figure 5 As shown, the sealing ring 6 has an outer sealing surface 62 and an inner sealing surface 61 for abutting against the outer wall of the pipe 7. The outer sealing surface 62 abuts against the sealing groove. The sealing ring 6 has a first elastic groove 63, which is located between the outer sealing surface 62 and the inner sealing surface 61. The first elastic groove 63 enhances the overall elasticity and deformation capacity of the sealing ring 6. When the pipe 7 elongates or shortens, it generates an axial force on the sealing ring 6, causing the first elastic groove 63 to deform, ensuring that the outer sealing surface 62 and the inner sealing surface 61 are tightly fitted against the sealing groove and the outer wall of the pipe 7, respectively, to accommodate the axial expansion and contraction of the pipe 7 caused by thermal expansion and contraction.

[0031] The inner sealing surface 61 is provided with a second elastic groove 611. The second elastic groove 611 provides elastic deformation space for the inner sealing surface 61. When the pipe 7 expands or contracts axially due to thermal expansion and contraction, the inner sealing surface 61 can adapt to the displacement of the pipe 7 through the deformation of the second elastic groove 611, ensuring that the inner sealing surface 61 is always tightly fitted with the outer wall of the pipe 7, improving the sealing effect of the inner side of the sealing ring 6, avoiding sealing failure caused by the expansion and contraction of the pipe 7, and maintaining a long-term sealing effect.

[0032] A third elastic groove 621 is provided on the outer sealing surface 62. The third elastic groove 621 provides elastic deformation space for the outer sealing surface 62. When the guide block 4 compresses the sealing ring 6, the outer sealing surface 62 can fit tightly against the sealing groove of the main body through the deformation of the third elastic groove 621, thereby enhancing the fit between the outer sealing surface 62 and the sealing groove and improving the sealing effect on the outside of the sealing ring 6. At the same time, the third elastic groove 621 can also buffer the compression pressure of the guide block 4, preventing the outer sealing surface 62 from being damaged due to excessive compression and extending the service life of the sealing ring 6.

[0033] 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.

[0034] 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 telescopic joint, comprising a body and a sealing ring (6), wherein a sealing groove is provided on the inner wall of the body, and the sealing ring (6) is installed in the sealing groove, characterized in that, It also includes several guide blocks (4) for pressing the pipe (7). The main body includes a socket section (1), a flared section (2) and a first connecting section (3) connected in sequence. The sealing groove is provided on the inner wall of the flared section (2). The first connecting section (3) is provided with a limiting groove (32) at one end away from the flared section (2). The guide block (4) is provided with a limiting rib (41) on the outer wall. The limiting rib (41) is inserted into the limiting groove (32) along the axis of the main body.

2. The expansion joint according to claim 1, characterized in that, It also includes a pressure cap (5), the inner wall of which is connected to the outer wall of the main body, and the side of the pressure cap (5) facing the main body abuts against the guide block (4).

3. The expansion joint according to claim 2, characterized in that, The pressure cap (5) includes a pressure ring (51) and a second connecting section (52). The second connecting section (52) is disposed on the side of the pressure ring (51) facing the main body. The pressure ring (51) abuts against the guide block (4). The outer wall of the first connecting section (3) is provided with an external thread (31). The inner wall of the second connecting section (52) is provided with an internal thread (521) that mates with the external thread (31). The first connecting section (3) and the second connecting section (52) are threadedly connected. The length of the limiting rib (41) is less than the depth of the limiting groove (32).

4. The expansion joint according to claim 1, characterized in that, The inner wall of the first connecting section (3) is provided with a guide slope (33). The diameter of the guide slope (33) gradually decreases along the direction away from the opening of the first connecting section (3). The outer surface of the guide block (4) is in contact with the guide slope (33) and the slope is equal.

5. The expansion joint according to claim 1, characterized in that, The guide block (4) is provided in multiple ways, and the multiple guide blocks (4) are evenly distributed along the circumferential direction of the first connecting segment (3).

6. The expansion joint according to claim 1, characterized in that, The limiting groove (32) is a trapezoidal groove, and the limiting rib (41) is a trapezoidal rib.

7. The expansion joint according to claim 2, characterized in that, The guide block (4) abuts against the sealing ring (6) at one end near the flared section (2).

8. The expansion joint according to claim 7, characterized in that, The sealing ring (6) is provided with an outer sealing surface (62) and an inner sealing surface (61) for abutting against the outer wall of the pipe (7). The outer sealing surface (62) abuts against the sealing groove. The sealing ring (6) is provided with a first elastic groove (63), which is located between the outer sealing surface (62) and the inner sealing surface (61).

9. The expansion joint according to claim 8, characterized in that, The inner sealing surface (61) is provided with a second elastic groove (611).

10. The expansion joint according to claim 8, characterized in that, The outer sealing surface (62) is provided with a third elastic groove (621).

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