Insert sleeve and connection sleeve

Abstract

The utility model discloses a kind of bushings for connecting pipeline pipe end and connecting sleeve provided with the bushing, the bushing includes: shell, sealing assembly, clamping assembly and tensioning device;The tensioning device is designed as the combined structure of multiple sets of tensioning components, the tensioning component can cross dead point and enter stable position;Further include the stopper for limiting the tensioning component to the center direction of pipeline movement.The bushing and connecting sleeve of the utility model can improve sealing effect and / or clamping effect, and / or simplify operation, manufacturing and use process.

Description

Technical Field

[0001] This utility model relates to a socket for connecting pipe ends and a connecting sleeve for connecting two pipe ends. Background Technology

[0002] In pipe connections, especially plastic pipe connections, connecting sleeves with inserts are commonly used: the ends of the pipes to be connected are inserted into the connecting sleeve from two opposite sides, and then sealed and fixed inside the sleeve. Alternatively, the insert can also be directly molded onto the end of a pipe.

[0003] In a widely used socket structure, the pipe is secured by an annular sealing ring made of an elastomeric material, which also ensures the required seal for the connection. The annular sealing ring is located within an annular circumferential groove of the socket; when the end of the pipe to be connected is inserted, the sealing ring is radially compressed between the inner wall of the annular groove and the outer surface of the corresponding pipe end, thereby tightly fitting against the outer surface of the pipe end and securing the pipe end through friction.

[0004] When using this type of socket connection, a significant force is required to insert the pipe end into the corresponding socket because the annular sealing ring, in order to achieve the necessary strong compression, creates significant resistance to the insertion of the pipe end. Furthermore, there is a risk of damage to the sealing ring during the process of slipping it over the pipe end. To avoid this problem, additional processing, such as deburring, is required for each pipe end.

[0005] EP 3 120 064 B1 discloses a plug-in connection structure with an annular sealing ring, which at least solves some of the aforementioned defects. In the plug-in connection structure described in this patent document, the annular sealing ring is deformed by a tensioning element: the tensioning element is designed as a crank structure, and by applying a clamping force, the width of the annular groove containing the annular sealing ring can be reduced, causing the sealing ring to be squeezed from both sides. The outer circumferential surface of the annular sealing ring is supported on the bottom of the annular groove, so its inner diameter decreases after deformation, thus fitting snugly against the pipe to be connected. This structure achieves a sealed connection between the pipe end and the plug-in connection structure. This disclosure incorporates, by reference, the technical solution described in EP 3 120 064 B1, and in particular the specific structure of the tensioning element described therein.

[0006] The aforementioned tensioning element specifically includes a first support ring and a second support ring, which are spaced apart in the axial direction. Multiple sets (e.g., ten sets) of paired plate-like members are suspended between the two support rings; these members together constitute the outer shell of the tensioning element. An elastic sealing sleeve covers the outside of the two support rings and the plate-like members.

[0007] Each pair of plate-like members is arranged side by side along its length and is pivotally hinged to each other. In each pair, one member is pivotally (or tiltably) hinged to the first support ring, and the other member is pivotally (or tiltably) hinged to the second support ring. The two members in each pair are tilted relative to each other such that the diameter of the tensioning element's housing at the midpoint between the two support rings is larger than the diameter at the vicinity of the support rings.

[0008] When the pipe end is secured within the sleeve using the aforementioned tensioning element, fluid pressure (usually compressed air) is applied to the outer surface of the shell composed of plate-like members. The pressurized fluid is injected into the cavity formed by the sealing sleeve and plate-like members through an interface. Under pressure, the tensioning element deforms radially inward, and each set of plate-like members crosses its respective dead point position. Simultaneously, the inward deformation of the outer sleeve pushes the two support rings apart, causing the tensioning element to elongate axially. Consequently, the support rings of the tensioning element axially compress the annular sealing ring. Since the annular sealing ring, made of elastomeric material, is almost incompressible, it contracts radially inward and exerts a significant force on the outer surface of the pipe end.

[0009] CH 718 244 A1 discloses an improved form of the aforementioned plug-in connection structure. To enhance the sealing effect, this document proposes structural improvements to the sealing assembly (i.e., the annular sealing ring and its mounting base). This disclosure incorporates, by reference, the technical solutions described in CH 718 244 A1, and in particular the specific structure of the sealing assembly described therein.

[0010] This sealing assembly is used to achieve a sealing function in pipe connections (especially static pipe connections, specifically the connection between a fluid delivery pipe and a connecting sleeve), and includes an annular sealing ring disposed within an annular groove. The sealing assembly comprises a sealing seat and a tensioning element (the specific structure of which is described above), which applies a clamping force to the annular sealing ring, thereby ensuring that the sealing ring adheres to (or remains in a fitted state) the delivery pipe.

[0011] This design allows the use of annular sealing rings with an inner diameter larger than the outer diameter of the pipe end to be sealed. Therefore, there is no need to stretch the sealing ring over the edge of the pipe; due to its larger inner diameter, it can fit over the pipe end without interference. This sealing assembly has a pressure side.

[0012] The sealing seat is located on the pressure side of the annular groove and has an overflow hole, allowing the pressure side of the annular sealing ring to withstand fluid pressure. In other words, the pressure side of the annular groove (especially at the bottom of the groove) can withstand pressure, thereby enhancing the sealing effect.

[0013] The pressure side of a sealing assembly refers to the side that bears the pressure of the fluid inside the pipe to be connected during operation.

[0014] To better secure the pipe end, the literature proposes designing the tensioning element as a multi-component structure in the support ring region. This tensioning element includes a pressure ring, a clamping ring, and a conical ring: the pressure ring is in contact (or can be in contact) with both the annular sealing ring and the conical ring; a clamping ring is positioned at the center of the conical ring; the conical ring and the clamping ring are slidably fitted together via their conical surfaces. The conical surface on the conical ring gradually widens along the pipe end insertion direction, so when the conical ring moves towards the annular sealing ring, the clamping ring is radially compressed. Under the action of this radial compression force, the clamping ring presses tightly against the pipe, securing the pipe through additional radial force. This disclosure also incorporates, by reference, the technical solution described in CH 718 244 A1, particularly the specific structure of the tensioning element described therein. Utility Model Content

[0015] The purpose of this invention is to provide a socket and / or connecting sleeve to improve the sealing effect and / or clamping effect, and / or simplify the operation, manufacturing and use process.

[0016] One or more of the above objectives are achieved by means defined in the independent claim, and other embodiments are derived from dependent claims or combinations of claims.

[0017] In one embodiment, the socket is used to connect the end of a pipe and includes a housing, a sealing assembly, a clamping assembly, and a tensioning device. The tensioning device can apply force to the sealing assembly and the clamping assembly, or allow force to be applied.

[0018] The tensioning device of this sleeve is designed as a combination of multiple tensioning components, which can cross the dead point and enter a stable position. A stop is provided on the sleeve to restrict the movement of the tensioning components towards the center of the pipe or sleeve. The specific structure of the tensioning components is as described above.

[0019] In existing technology, the tensioning member, once it passes the dead point in the working state, is blocked by the pipe inside the sleeve and cannot continue to move. However, if no pipe is inserted into the sleeve, but the clamping element is still accidentally activated, it may damage the clamping element or even the entire sleeve. By setting a stop on the sleeve, this problem can be avoided: even if no pipe is inserted and accidental activation occurs, the tensioning member will not enter an abnormal state, thus preventing the sleeve from being damaged due to premature activation.

[0020] In addition, the stop can be designed as a guide structure for the pipe end. This design prevents the pipe end from being inserted into the socket at an angle, thus avoiding damage to the internal structure of the socket.

[0021] The stop block can be designed as an integral part of the housing or the end cap. This integrated manufacturing method reduces the number of moving parts.

[0022] As an alternative, the stop block can also be designed as an integral part of the tensioning device, specifically as part of the support ring.

[0023] Especially when the stop is designed as part of the support ring, the tensioning device is better protected: even if the tensioning device is located outside the housing or the housing of the insert is incomplete, damage to the clamping element can be avoided even if accidental activation occurs.

[0024] As mentioned above, the tensioning device can be designed as a combination structure of multiple pairs of tensioning components, with each pair of tensioning components having its two ends mounted on two support rings.

[0025] The clamping assembly may include a clamping ring and a conical ring, which are slidably fitted together via conical surfaces. Depending on the angle of the conical surfaces, this fit can amplify the force several times before it is applied to the outer circumferential surface of the pipe end.

[0026] Specifically, the design can be as follows: a tensioning device applies force to the conical ring and drives its movement, causing the clamping ring to press tightly against the outer circumferential surface of the pipe end. The force here refers to the force that drives the clamping ring to move along the conical surface, and the force acting on the center of the pipe will increase accordingly after the inclination angle of the conical surface is changed.

[0027] A further design could be made such that the conical surface gradually expands along the insertion direction of the pipe end. In other words, the conical surface or its diameter gradually decreases along the pipe extraction direction. Therefore, when the pipe tends to be pulled out of the sleeve or is pulled outward, it will cause the clamping ring to move in the same direction, at which point the force acting on the outer circumference of the pipe will increase.

[0028] To improve the contact effect between the clamping ring and the pipe, protruding teeth can be provided on the clamping ring, and the orientation of the protruding teeth can be opposite to the direction of pipe pulling out.

[0029] In addition, the sealing assembly can be positioned behind the clamping assembly along the insertion direction of the pipe end. This arrangement ensures that, under normal conditions, the clamping assembly and its corresponding tensioning device will not come into contact with the fluid inside the pipe.

[0030] Another embodiment relates to a socket for connecting pipe ends, the specific structure of which can be referred to above. The socket includes a clamping assembly with a positioning element. In the non-operating state of the socket, the positioning element can hold the clamping assembly in a preset position or can be held in a preset position.

[0031] This design prevents, for example, the conical ring from prematurely squeezing the clamping ring, thus avoiding obstruction of pipe insertion, or preventing the pipe end from pushing the clamping ring into the conical ring during insertion. The positioning element ensures that the clamping ring or conical ring will only begin to move from a preset position when the applied force reaches a specific value.

[0032] The positioning element can be designed as a snap hook or a protruding structure, which is easy to manufacture and requires no additional parts.

[0033] Specifically, the positioning element can be designed on the conical ring of the clamping assembly: as long as the conical ring does not move, it can ensure that the clamping ring is not squeezed. This design is particularly advantageous for the insert described above, which is designed as a multi-part structure in the support ring area.

[0034] Another embodiment relates to a socket for connecting pipe ends, the specific structure of which is described above. Its tensioning device is designed as a combination of multiple tensioning members that can pass through the dead point and enter a stable position. A closed air hose is wrapped around the circumference of the tensioning member. Here, "closed" means that the air hose has a closed cross-section, similar to the structure of a bicycle inner tube; in other words, the air hose forms a closed profile along the circumference of the tensioning device.

[0035] This design eliminates the need for the housing of the socket to remain airtight, at least in the clamping element and its operating area, as the fluid driving the clamping element can be injected into a closed air hose.

[0036] In contrast, existing technologies require a chamber: this chamber is sealed by a sealing ring on the side facing the center of the pipe, and by the housing itself on the side away from the center of the pipe. Therefore, it is essential to ensure a tight seal between the sealing ring and the housing. This complex sealing design can be avoided by using a circumferentially oriented air hose.

[0037] The air hose may also be designed to have two closed ends that overlap in the circumferential direction at an angle of at least 10°, preferably at least 15°, and more preferably at least 20°.

[0038] This design facilitates the installation of air hoses: even if the pipe end is already inserted, the air hose can be installed onto the socket from one side.

[0039] Another embodiment relates to a socket for connecting pipe ends, the specific structure of which is described above. It includes a housing and a tensioning device disposed within the housing. The housing is either closed or can be closed by an end cap. The connection between the housing and the end cap is a threaded structure, the thread being segmented along the circumference of the housing to form at least one sliding segment. The end cap has a matching thread, also segmented, with the width of the remaining thread segment on the end cap being smaller than the width of the corresponding sliding segment.

[0040] This design allows the end cap and housing to be axially fitted together at a specific position, and then connected by partially rotating the end cap relative to the housing (without needing to rotate a full revolution). Simultaneously, the threaded section further tightens the end cap onto the housing.

[0041] In particular, the threads can be designed as multi-start threads to ensure that each thread segment can fully engage. The connection between the housing and the end cap is similar to a bayonet connection, but after the thread segments are engaged, the housing and end cap can be further tightened.

[0042] Preferably, the threaded sections and sliding sections are evenly distributed in the circumferential direction, and the total coverage area of ​​the threaded sections in the circumferential direction is less than 50%. In other words, the width of each sliding section is greater than the width of the adjacent threaded section. This design is applicable to both housings and end caps.

[0043] Another embodiment relates to a socket for connecting pipe ends, the specific structure of which can be referred to above. Its clamping assembly includes a clamping ring composed of multiple independent segments, which can be connected by a flexible structure or designed as independent segments and fixed by a retainer.

[0044] This structure facilitates the deformation of the clamping ring. By designing the clamping ring as independent segments, gaps can be created between the segments, making it easier to reduce the diameter of the clamping ring without needing to compress it circumferentially. For large-diameter clamping rings, the connecting structure between the segments can be completely eliminated, and each segment can be designed as an independent component. To position these segments within the sleeve, a structure similar to a ball bearing cage can be provided.

[0045] Each segment is independent of the others, so they can each participate in the clamping action without obstruction.

[0046] Another embodiment relates to a socket for connecting a pipe end, the specific structure of which is described above. It includes a housing and a tensioning device disposed within the housing, the housing being either closed or closable by an end cap. The end cap or housing has at least one opening for inserting an unlocking tool.

[0047] Unlike existing sockets, the socket in this embodiment is reusable. Existing sockets are typically single-use because their clamping elements cannot be unlocked. However, by providing an opening in the housing and / or end cap, an unlocking tool can be inserted to push the clamping element back from its dead-point position to its initial position, thereby allowing the inserted tube end to be removed. The unlocking tool can be a screwdriver or a piece of traction rope, etc.

[0048] Another embodiment relates to a connecting sleeve comprising two opposing inserts, the specific structure of which is as described above. This connecting sleeve enables the connection of two pipes or two pipe ends. In particular, the two inserts can be designed to share a single housing.

[0049] What all embodiments have in common is that the sealing seat is located on the pressure side of the annular groove and may have an overflow hole, so that the pressure side of the annular sealing ring can withstand fluid pressure. In other words, the pressure side of the annular groove, especially at the bottom of the groove, can withstand pressure, thereby enhancing the sealing effect.

[0050] The pressure side of a sealing assembly refers to the side that bears the pressure of the fluid inside the pipe to be connected during operation.

[0051] Compared with the prior art, the insert and connecting sleeve of this utility model can improve the sealing effect and / or clamping effect, and / or simplify the operation, manufacturing and use process. Attached Figure Description

[0052] Figure 1 A perspective sectional view of a connecting sleeve containing two inserts; Figure 2 for Figure 1 An orthogonal sectional view of a single socket; Figure 3 for Figure 2 A view of the clamping element in its active state; Figure 4 This is another implementation method for the insert; Figure 5 A perspective detail view of the positioning element; Figure 6 Another perspective detail of the positioning element; Figure 7 A separate view for the positioning element; Figure 8 An orthogonal sectional view of a single socket with an air hose in its non-operating state; Figure 9 for Figure 8 A view showing the working status of the air hose; Figure 10 A stand-alone perspective view of the air hose; Figure 11 A separate perspective view of another type of air hose; Figure 12 A perspective view of the insert without end caps; Figure 13 A perspective view of the insert end cap; Figure 14 A perspective view of the clamping assembly; Figure 15 for Figure 14 Exploded view of the clamping component; Figure 16 This is a perspective view of the insert. Detailed Implementation

[0053] The following description, in conjunction with the accompanying drawings, outlines various possible embodiments of this utility model.

[0054] Figure 1 A perspective sectional view of a connecting sleeve 200 comprising two inserts 100 is shown. The two inserts 100 share a housing 60, which connects them as a single unit; each insert contains the end 21 of a pipe 20. The inserts 100 shown in the figure are in a non-operating state.

[0055] Figure 2 Figure 1 shows an orthogonal sectional view of a single insert 100. The insert 100 contains the pipe end 21 of a pipe 20, and includes a housing 60 and a corresponding end cap 61. Inside the assembly formed by the end cap 61 and the housing 60, there is a clamping assembly 40 and a tensioning device 50. The clamping assembly 40 includes a clamping ring 41 and a conical ring 42; the tensioning device 50 includes a first tensioning member 51 and a second tensioning member 52, which are respectively mounted between corresponding support rings 44 and designed as a crank structure; the tensioning device 50 is externally wrapped with a sealing ring 45. In Figure 2, the support ring 44 on the right is supported on the end cap 61; the support ring 44 on the left is designed to apply pressure to the clamping assembly 40. The sealing assembly 30 consists of an O-ring disposed within a laterally open groove, which is closed by a pressure ring 46. The pressure ring 46 is driven by a conical ring 42 integrally designed with a support ring 44. The laterally open groove is formed within the housing 60 and has an overflow hole (not shown in detail) to allow the pressure side of the O-ring to withstand pressure, thereby enhancing the sealing effect of the sealing assembly 30. Also visible in the figure are a stop 70 to prevent the tensioning device 50 from moving excessively past its dead point and an unlocking opening 62.

[0056] Figure 3Figure 2 shows a view of the clamping element 50 in its activated state. As shown, the tensioning members 51 and 52 have moved towards the center of the pipe and passed their dead point, i.e., their maximum extension position in a single plane, and are supported on the stop 70 in a stable preset position. The insertion side of the stop 70 has an unlabeled chamfered structure to facilitate the directional insertion of the pipe 20. As the tensioning members 51 and 52 move, the support rings 44 located on both sides of the tensioning device 50, specifically the support ring 44 on the left in the figure, are pushed outward: on the one hand, they compress the sealing assembly 30 to form a seal with the pipe 20; on the other hand, they compress the clamping ring 41, reducing its inner diameter. This process is achieved thanks to two sets of cooperating conical surfaces. When the conical ring 42, which is integrally designed with the support ring 44, moves, it compresses the clamping ring 41 inward. At the same time, the movement of the conical ring 42 also drives the pressure ring 46 to move, thereby compressing the O-ring of the sealing assembly 30. The O-ring in the diagram is still uncompressed, and therefore only partially overlaps with the pressure ring 46. The process described above is triggered by injecting fluid into the cavity between the sealing ring 45 and the end cap 61.

[0057] Figure 4 Another embodiment of the insert 100' is shown. In this embodiment, the clamping assembly 40 is also a multi-part structure and is part of the support ring 44. The clamping assembly 40 includes a conical ring 42 and a clamping ring 41. As shown, the conical ring 42, on the one hand, presses the clamping ring 41 towards the center of the pipe 20, and on the other hand, by moving and pressing the pressure ring 46 located in the middle, it forms a seal between the sealing assembly 30 and the pipe 20 and the housing 60 of the insert 100'. This embodiment also includes a stop 70 for limiting the movement of the tensioning device 50, but unlike the embodiment in FIG3, the stop 70 is located on the second support ring 44 and extends to the clamping ring 41, thus also providing guidance and centering for the pipe 20. Through guidance and centering, it is ensured that the end of the pipe 20 does not come into contact with the sealing assembly 30, thereby avoiding damage to the sealing assembly. Obviously, this alternative embodiment is compatible with other embodiments and is applicable to all insert structures. It should be noted that in the embodiment shown in Figure 4, an alternative hose structure (instead of the sealing ring 45) is used, as detailed in Figure 8 and its description.

[0058] Figure 5A perspective detail view of the positioning element 43, which is disposed on the support ring 44, is shown. This detail view is taken from the insert 100' in Figure 4. As shown, the positioning element 43 is designed as a protruding tongue structure that abuts against a corresponding mating structure on the housing 60, thereby fixing the support ring 44 in a preset position. Obviously, this alternative embodiment is compatible with all insert embodiments.

[0059] Figure 6 Another perspective detail of the positioning element in Figure 5 is shown. As shown, the sleeve has been activated, and the clamping assembly 40 is also in operation. The support ring 44 and the conical ring 42 integrated with it have moved towards the sealing assembly 30. On the one hand, the conical surface presses the clamping ring 41 towards the center of the pipe 20, and on the other hand, it presses the sealing assembly 30 axially to achieve the sealing function. The positioning element 43 undergoes compressive deformation under the action of lateral force, allowing the clamping ring 41 to move from its initial position.

[0060] Figure 7 A separate view of the positioning element 43 is shown. As shown, the positioning element 43 is designed as a protruding tongue structure, which is disposed on a tongue-shaped component of the support ring 44 or the conical ring 42.

[0061] Figure 8 An orthogonal sectional view of a single socket 100' with an air hose 80 in its non-operating state is shown. Unlike the socket 100 in FIG. 3, the housing 60 and end cap 61 in this embodiment no longer need to maintain airtightness because the air hose 80 itself constitutes a closed structure. By inflating the air hose 80, the tensioning members 51, 52 of the tensioning device 50 can be moved past the dead point. Obviously, this alternative embodiment is compatible with all embodiments of the socket 100.

[0062] Figure 9 Figure 8 shows a view of the air hose in operation. The tensioning device 50 is activated by injecting fluid (preferably air) into the air hose 80.

[0063] Figure 10 A freestanding perspective view of the air hose 80 is shown. As shown, the air hose 80 has a closed cross-section extending circumferentially along its central axis; this closed cross-section is accessible through an air inlet 83, which may be designed as a valve structure, for example.

[0064] Figure 11A separate perspective view of another air hose 80' is shown. Compared to the air hose 80 in Figure 10, the air hose 80' differs in that, while also extending circumferentially along a central axis, it achieves circumferential closure through two overlapping ends 81, 82. Therefore, even if a pipe is already inserted, the air hose 80' can be installed into the socket or replace existing air hoses 80 / 80'. Clearly, the implementations of air hoses 80 and 80' are interchangeable and applicable to all socket structures.

[0065] Figure 12 The figure shows a perspective view of the sleeve 100 without end caps 61', the end cap structure of which is shown in Figure 13. The housing 60' of the sleeve 100 has multi-start threads 63, which are segmented by sliding sections 64. For clarity, not all thread segments and sliding sections are labeled. As shown, the threads 63 or thread segments are evenly distributed along the circumference of the housing 60', and the sliding sections 64 are also evenly distributed along the circumference among the threads 63. The total circumferential coverage of the thread segments is less than 50%, meaning the spacing between each thread segment is greater than the width of the thread segment itself.

[0066] Figure 13 A perspective view of the end cap 61' of the socket 100 is shown. Similar to the housing 60' in Figure 12, the end cap 61' also has threads 65, which are also segmented by sliding sections 66, with only a portion of the thread remaining. These thread segments are evenly distributed circumferentially, and the total coverage area is less than 50%. This design allows the end cap 61' to be axially fitted onto the housing 60' and then locked by circumferential rotation. Clearly, this thread design is applicable to all socket implementations.

[0067] Figure 14 A perspective view of the clamping assembly 40 is shown. The clamping assembly 40 includes a clamping ring 41, a conical ring 42, and a support element 47; the clamping ring 41 is composed of multiple independent segments, and the conical ring is designed as a cage structure; the conical ring 42 can be connected to the support element 47 to fix the segments of the clamping ring 41 therein.

[0068] Figure 15 An exploded view of the clamping assembly 40 in Figure 14 is shown. The view clearly shows the segmented structure of the clamping ring 41: each segment of the clamping ring 41 is provided with protruding teeth 48, which can slide within the corresponding grooves 49 of the conical ring 42; each segment is axially guided and moved through the grooves 49.

[0069] Figure 16A perspective view of the insert 100 is shown. This embodiment includes openings 62 through which the tensioning device can be unlocked, allowing the pipe inserted into the insert 100' to be removed. Inserting an unlocking tool into the openings 62 allows the tensioning device 50 to return to a relaxed state, i.e., pushing the tensioning members 51 and 52 past their dead points back to their initial positions, thereby removing the pipe 20 fixed within the insert 100.

Claims

1. A socket for connecting to the end of a pipe, comprising: The device comprises a housing, a sealing assembly, a clamping assembly, and a tensioning device; the tensioning device is designed as a combination structure of multiple tensioning members, which can pass through the dead point and enter a stable position; characterized in that it further includes a stop for restricting the movement of the tensioning members toward the center of the pipe.

2. The sleeve according to claim 1, characterized in that, The stop is designed as a guide structure at the end of the pipe.

3. The sleeve according to claim 1, characterized in that, The stop is designed as an integral part of the housing.

4. The sleeve according to claim 1, characterized in that, The stop block is designed as an integral component of the tensioning device.

5. The sleeve according to any one of claims 1 to 4, characterized in that, The clamping assembly includes a clamping ring and a conical ring, which are slidably fitted together via a conical surface.

6. The sleeve according to claim 5, characterized in that, The tensioning device applies a force to the conical ring and drives it to move, so that the clamping ring is pressed tightly against the outer circumferential surface of the pipe.

7. The sleeve according to claim 5, characterized in that, The conical surface gradually widens along the insertion direction of the tube end.

8. The socket according to claim 1, characterized in that, The sealing assembly is positioned behind the clamping assembly along the insertion direction of the pipe end.

9. The sleeve according to claim 1, characterized in that, The clamping assembly is provided with a positioning element. When the socket is not in operation, the positioning element holds or can hold the clamping assembly in a preset position.

10. The sleeve according to claim 9, characterized in that, The positioning element is designed as a snap hook or a protruding structure.

11. The socket according to claim 9 or 10, characterized in that, The clamping assembly includes a clamping ring and a conical ring, which are slidably fitted together via a conical surface; the positioning element is disposed on the conical ring of the clamping assembly.

12. The socket according to claim 1, characterized in that, The tensioning member is wrapped with a closed air hose along its outer circumferential direction.

13. The socket according to claim 12, characterized in that, The air hose has two closed ends that overlap in the circumferential direction at an angle of at least 10°, 15°, or 20°.

14. The sleeve according to claim 1, characterized in that, The housing is closed or can be closed by an end cap; the housing and the end cap are connected by threads, and the threads are segmented along the circumferential direction of the housing to form sliding sections between the thread segments; the end cap is provided with matching threads, which are also segmented, and the width of the thread segment on the end cap is smaller than the width of the sliding section.

15. The sleeve according to claim 1, characterized in that, The clamping assembly includes a clamping ring, which is composed of multiple independent segments connected by a flexible structure or fixed by a retainer.

16. The socket according to claim 1, characterized in that, The housing is closed or can be closed by an end cap; the end cap has an opening for inserting an unlocking tool.

17. A connecting sleeve, characterized in that, It includes two oppositely arranged sockets as described in any one of claims 1 to 16.

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