Moistureproof cold-shrink cable joint

Abstract

The invention relates to the technical field of cable connecting devices, in particular to a moisture-proof cold shrinkage cable connector which comprises a cold shrinkage head, mounting sleeves, a circular ring, a first gear ring, a limiting groove, a rotating disc, an arc groove, a second gear ring, a limiting disc, a straight groove, an abutting block and a moving part, the cold shrinkage head is a core sealing component, and the mounting sleeves are integrally formed at the two ends of the cold shrinkage head through injection molding; a circular ring is rotationally connected to the outer peripheral wall of the mounting sleeve, and a first gear ring is integrally formed on the inner ring wall of the circular ring; a rotating disc is coaxially arranged on the inner side of the circular ring, arc grooves are evenly formed in the end face of the rotating disc in the circumferential direction, a second gear ring is integrally formed on the outer ring wall of the rotating disc, and the second gear ring and the first gear ring are meshed to form a gear transmission pair. By means of a mechanical transmission type abutting structure, active pressurization sealing of the end of the rubber sleeve is achieved, a dual-sealing effect is formed in cooperation with passive shrinkage of a cold shrinkage material, the moisture-proof performance is remarkably improved, and sealing failure caused by wrinkling and skin turning in the outdoor environment is effectively avoided.

Description

Technical Field

[0001] This invention relates to the field of cable connection device technology, and in particular to a moisture-proof and cold-shrink cable joint. Background Technology

[0002] As a key component of cable connections in power systems, the sealing performance of cold-shrink cable joints directly affects the safety and stability of power transmission.

[0003] Existing cold-shrink cable joints, when used outdoors for extended periods, are susceptible to aging, wrinkling, or peeling of the rubber material at the points where they meet the cable. This leads to seal failure, allowing moisture intrusion and causing a decline in cable insulation performance, or even short-circuit faults. Therefore, a moisture-proof cold-shrink cable joint is designed to address these issues. Summary of the Invention

[0004] In order to overcome the shortcomings of existing cold shrink cable joints that are prone to moisture-proof performance degradation due to end seal failure in outdoor environments, the purpose of this invention is to provide a moisture-proof cold shrink cable joint.

[0005] The technical solution is as follows: A moisture-proof cold-shrink cable connector includes a cold-shrink head, an mounting sleeve, a circular ring, a first toothed ring, a limiting groove, a turntable, an arc groove, a second toothed ring, a limiting disc, a straight groove, a stop block, and a movable component. The cold-shrink head is the core sealing component, and both ends of it are integrally molded with mounting sleeves. The outer peripheral wall of the mounting sleeve is rotatably connected to the circular ring, and the inner ring wall of the circular ring is integrally formed with the first toothed ring. The inner side of the circular ring is coaxially arranged with the turntable, and the end face of the turntable is uniformly formed with arc grooves along the circumferential direction. The outer ring wall of the turntable is integrally formed with the second toothed ring, which meshes with the first toothed ring to form a gear transmission pair. The inner side wall of the mounting sleeve near the turntable is fixed with a limiting disc, and the limiting disc is uniformly formed with radial straight grooves along the circumferential direction. The inner side of the limiting disc is provided with a stop block, and the outer wall of each stop block is integrally formed with a movable component. The movable component simultaneously passes through the corresponding straight groove and arc groove to form a sliding fit.

[0006] As a further preferred embodiment, the cold shrink head includes a rubber sleeve, a telescopic sleeve, and a support tube. The two ends of the telescopic sleeve are integrally formed with rubber sleeves, and the support tube is inserted into the inner cavity of the rubber sleeve and the telescopic sleeve. The support tube has a hollow tubular structure and is used to expand the rubber sleeve and the telescopic sleeve to maintain an expanded state.

[0007] As a further preferred option, the inner wall of the ring has a smooth annular limiting groove, which forms a low-friction fit with the limiting plate.

[0008] As a further preferred embodiment, the ring also includes bolts, with bolts threaded onto the radial wall of the ring. The bolt's threaded end penetrates the ring and abuts against the outer peripheral wall of the mounting sleeve. The circumferential positioning of the ring is achieved by the frictional force generated by tightening the bolts.

[0009] As a further preferred embodiment, a buffer pad is also included. The end of the abutment facing the rubber sleeve is fixed with the buffer pad by adhesive. The buffer pad is made of silicone rubber and has a slightly convex arc-shaped structure on its surface.

[0010] As a further preferred option, the moving part has a cylindrical structure with a self-lubricating coating on its outer surface. This coating forms a low-friction fit with the contact parts of the straight groove and the arc groove, ensuring that the moving part does not jam during sliding.

[0011] As a further preferred embodiment, the rubber sleeve and the telescopic sleeve are integrally molded from EPDM rubber, and the support tube is made of a high molecular polymer material with memory properties. This material maintains rigidity at room temperature to support the cold-shrink structure and can achieve segmented extraction when subjected to specific external forces.

[0012] As a further preferred option, the inner wall of the telescopic sleeve has a corrugated pleated structure with the pleats aligned with the cable axis. During the cold shrinkage process, the expansion and contraction of the pleats can compensate for the diameter differences of cables of different specifications, while also enhancing the fit and sealing with the cable surface.

[0013] As a further preferred option, the turntable and the limiting plate form a dynamic-static cooperation structure. When the turntable rotates, the inclined groove wall of the arc groove generates radial thrust through sliding contact with the moving part. Under the guidance and constraint of the straight groove of the limiting plate, the block can only make radial linear movement along the straight groove.

[0014] As a further preferred option, six arc grooves are evenly distributed along the circumference of the turntable, and six straight grooves are correspondingly opened on the limiting plate. Each set of arc grooves and straight grooves is connected to a stop block to form six sets of circumferentially symmetrical pressure units.

[0015] The present invention has the following advantages:

[0016] 1. This invention achieves active pressure sealing at the end of the rubber sleeve through a mechanical transmission-type clamping structure. Combined with the passive shrinkage of the cold-shrink material, a double sealing effect is formed, which significantly improves the moisture-proof performance and effectively avoids sealing failure caused by wrinkling and peeling in outdoor environments.

[0017] 2. The present invention adopts six sets of evenly distributed abutment blocks and guide structures to ensure that the rubber sleeve is subjected to balanced force, avoid material damage caused by excessive local compression, and extend the service life of the joint.

[0018] 3. The buffer pad on the abutment block of the present invention can enhance the fit between the abutment block and the rubber sleeve, and avoid wear on the rubber material caused by rigid contact. Attached Figure Description

[0019] Figure 1 This is a three-dimensional structural diagram of the present invention.

[0020] Figure 2 This is a three-dimensional structural diagram of the rubber sleeve, telescopic sleeve, and support tube of the present invention.

[0021] Figure 3 This is an exploded view of the rubber sleeve, telescopic sleeve, and support tube of the present invention.

[0022] Figure 4 This is a three-dimensional structural diagram of the mounting sleeve and ring of the present invention.

[0023] Figure 5 This is a three-dimensional structural diagram of the turntable, limiting disc, and stop block of the present invention.

[0024] Figure 6 This is an exploded view of the first gear ring, turntable, limiting disc, and stop block of the present invention.

[0025] Figure 7 This is a three-dimensional structural diagram of the turntable and the second gear ring of the present invention.

[0026] Figure 8 This is a three-dimensional structural diagram of the abutment, buffer pad, and moving part of the present invention.

[0027] Wherein: 1-Cold shrink head, 101-Rubber sleeve, 102-Telescopic sleeve, 103-Support tube, 2-Mounting sleeve, 3-Ring, 301-First toothed ring, 302-Limiting groove, 4-Bolt, 5-Turntable, 501-Arc groove, 502-Second toothed ring, 6-Limiting plate, 601-Straight groove, 7-Abutting block, 701-Buffer pad, 702-Moving part. Detailed Implementation

[0028] The technical solution will be further described below with reference to specific embodiments. It should be noted that the terms "up," "down," "left," and "right" used in this document refer only to the position of the structure shown in the corresponding drawings. The serial numbers assigned to components in this document, such as "first," "second," etc., are only used to distinguish the described objects and have no sequential or technical meaning. Unless otherwise specified, terms such as "connection" and "linkage" in this application include both direct and indirect connections (linkages).

[0029] A moisture-proof cold-shrink cable connector, such as Figures 1-8As shown, the device includes a cold shrink head 1, a mounting sleeve 2, a circular ring 3, a first gear ring 301, a limiting groove 302, a turntable 5, an arc groove 501, a second gear ring 502, a limiting disc 6, a straight groove 601, a stop block 7, and a moving part 702. The cold shrink head 1 is the core sealing component, and both ends of it are integrally molded with mounting sleeves 2. The outer peripheral wall of the mounting sleeve 2 is rotatably connected to the circular ring 3, and the inner ring wall of the circular ring 3 is integrally molded with the first gear ring 301. The turntable 5 is coaxially arranged on the inner side of the circular ring 3, and the end face of the turntable 5 is circumferentially square. The turntable 5 has uniformly formed arc grooves 501. The outer ring wall of the turntable 5 is integrally formed with a second gear ring 502, which meshes with the first gear ring 301 to form a gear transmission pair. The mounting sleeve 2 is fixed with a limiting disk 6 near the inner side wall of the turntable 5. The limiting disk 6 has radial straight grooves 601 uniformly formed along the circumference. The inner side of the limiting disk 6 is provided with a stop block 7. The outer wall of each stop block 7 is integrally formed with a moving part 702. The moving part 702 passes through the corresponding straight groove 601 and arc groove 501 to form a sliding fit.

[0030] like Figures 2-3 As shown, the telescopic sleeve 102 and the rubber sleeve 101 adopt an integral molding structure, which eliminates the weak points in the sealing that may be generated by the splicing seam, and ensures that the two form a continuous and complete elastic sealing body, providing a structural basis for moisture-proof sealing. The hollow tubular structure of the support tube 103 can stably expand the rubber sleeve 101 and the telescopic sleeve 102 to maintain an expanded state, which facilitates the smooth insertion of the cable to be connected. After being pulled out, the rubber sleeve 101 and the telescopic sleeve 102 can quickly shrink and tightly fit the cable surface with their own elasticity to achieve initial cold shrinkage sealing. The overall structure takes into account both the ease of installation and the reliability of sealing, providing a good foundation for subsequent mechanical tight sealing.

[0031] like Figure 6 As shown, the inner wall of the ring 3 has a smooth annular limiting groove 302, which forms a low-friction fit with the limiting disk 6. This can significantly reduce the frictional resistance when the two rotate relative to each other, ensuring that the ring 3 rotates smoothly without jamming, reducing the wear of the ring 3 and the limiting disk 6, extending the service life of the components, and providing a reliable guarantee for the stable operation of the mechanical clamping structure.

[0032] like Figures 4-5 As shown, a bolt 4 is threaded onto the radial wall of the ring 3. The end of the bolt 4 passes through the ring 3 and abuts against the outer peripheral wall of the mounting sleeve 2. The friction generated by tightening the bolt 4 achieves circumferential positioning of the ring 3, effectively preventing it from loosening under outdoor vibration, temperature changes and other working conditions, ensuring the long-term stability of the clamping force of the abutment block 7. At the same time, the detachable design of the bolt 4 makes it easy to flexibly adjust the clamping force according to sealing requirements in the future, significantly improving the ease of maintenance of the device.

[0033] like Figure 8As shown, a buffer pad 701 is fixed to one end of the abutment 7 facing the rubber sleeve 101 by adhesive bonding. The buffer pad 701 is made of silicone rubber and its surface has a slightly convex arc structure. The elastic deformation of silicone rubber can fill the small unevenness on the surface of the rubber sleeve 101, enhance the sealing fit. At the same time, the buffer pad 701 can isolate the rigid contact between the abutment 7 and the rubber sleeve 101, avoid wear on the rubber sleeve 101 during the clamping process, and absorb the impact force generated by mechanical vibration, protecting the structural integrity of the rubber sleeve 101.

[0034] like Figure 8 As shown, the self-lubricating coating on the outer surface of the moving part 702 forms a low-friction fit with the straight groove 601 and the arc groove 501, which greatly reduces the resistance during the sliding process and ensures that the moving part 702 slides in the groove without jamming or sticking. This design not only makes the radial movement of the abutment block 7 smoother and more precise and ensures the uniformity of the abutment force, but also reduces the friction and wear between the parts and extends the service life of the moving part 702 and the groove.

[0035] like Figures 2-3 As shown, the rubber sleeve 101 and the telescopic sleeve 102 are integrally molded from EPDM rubber, giving them excellent weather resistance, aging resistance and elastic recovery ability, and can resist the erosion of outdoor ultraviolet rays, high and low temperatures and other environments for a long time. The support tube 103 is made of memory polymer material, which can stably expand the cold shrink structure and can be removed in sections, ensuring that the cold shrink process is controllable. The combination of the two significantly improves the structural stability and environmental adaptability of the cold shrink head, providing a basic guarantee for the sealing performance.

[0036] like Figures 2-3 As shown, the inner wall of the telescopic sleeve 102 has a corrugated pleated structure, and the pleat direction is consistent with the cable axis. During the cold shrinkage process, the expansion and contraction of the pleats can flexibly compensate for the diameter difference of cables of different specifications, which greatly improves the adaptability of the device to cables of different diameters. At the same time, the pleated structure can enhance the tightness of the fit between the telescopic sleeve 102 and the cable surface, further improving the sealing performance.

[0037] like Figures 4-6 As shown, the dynamic and static mating structure formed by the turntable 5 and the limiting plate 6, through the radial thrust of the inclined groove wall of the arc groove 501 on the moving part 702, combined with the guiding constraint of the straight groove 601 on the moving part 702, ensures that the abutment 7 can only move in a straight line in the radial direction. This design precisely controls the movement direction of the abutment 7, ensuring that its clamping force on the rubber sleeve 101 is always perpendicular to the cable axis, avoiding force offset loss, and significantly improving the effective utilization rate of the sealing pressure.

[0038] like Figures 4-6As shown, the six arc grooves 501 evenly distributed along the circumference on the turntable 5 and the six straight grooves 601 correspondingly opened on the limiting plate 6, together with the six abutment blocks 7, form a circumferentially symmetrical pressure unit, which can make the pressure of the abutment blocks 7 on the rubber sleeve 101 evenly distributed along the circumference, reduce pressure deviation, and effectively avoid permanent deformation of the rubber sleeve 101 caused by local excessive compression.

[0039] Preparation before installation: The rubber sleeve 101 and telescopic sleeve 102 of the cold shrink head 1 are kept in an expanded state under the support of the support tube 103 (the inner diameter of the cold shrink head 1 is larger than the outer diameter of the cable to be connected). At this time, the abutment 7 is in the initial position (away from the rubber sleeve 101), and the buffer pad 701 is not in contact with the rubber sleeve 101; the bolt 4 is in the loose state, and the ring 3 can rotate freely. Before installation, attention should be paid to environmental cleanliness. Before inserting the cable, the oil, water and sharp objects on the surface of the cable should be removed to avoid puncturing the inner wall of the rubber sleeve 101.

[0040] Cable insertion and initial sealing: After cleaning, insert the two cables to be connected into the cold shrink head 1 from both ends, aligning the cable butt joints in the middle of the cold shrink head 1 to ensure the connection length meets the requirements. Apply axial tension to pull away the support tube 103. The support tube 103 is pulled away in sections under tension. The support tube 103 should be pulled away at a uniform speed to prevent uneven local shrinkage of the cold shrink head 1 due to excessively fast pulling. The rubber sleeve 101 and the telescopic sleeve 102 begin to shrink due to the elastic recovery force of the EPDM rubber. The inner wall of the rubber sleeve 101 tightly fits the outer wall of the cable, and the corrugated folds of the telescopic sleeve 102 expand with the shrinkage, compensating for the cable diameter deviation and achieving initial sealing.

[0041] Mechanical clamping and double sealing: Rotating the ring 3 clockwise (viewed from the cable end), the ring 3 drives the turntable 5 to rotate synchronously through the meshing of the first toothed ring 301 and the second toothed ring 502. As the turntable 5 rotates, the inclined groove wall of the arc groove 501 on the turntable 5 generates a radial thrust on the moving part 702. Since the limiting plate 6 is fixed, the straight groove 601 restricts the moving part 702 to slide only radially. Therefore, the moving part 702 drives the abutment 7 to move along the straight groove 601 towards the direction closer to the cable axis. During the movement of the abutment 7, the buffer pad 701 at its end gradually contacts the outer peripheral wall of the rubber sleeve 101. As the ring 3 continues to rotate, the buffer pad 701 is compressed and generates elastic deformation, applying uniform radial pressure to the rubber sleeve 101, forcing the rubber sleeve 101 to further conform to the cable surface, forming a double sealing structure of "cold shrinkage elastic seal + mechanical active clamping seal". When the compression of the buffer pad 701 reaches the preset value (usually 1-2mm), stop rotating the ring 3, tighten the bolt 4, and ensure that the end of the bolt 4 is in close contact with the outer peripheral wall of the mounting sleeve 2. The position of the ring 3 is fixed by friction, ensuring the stable clamping force of the abutment block 7. After the double sealing is completed, waterproof tape can be wrapped around the gap between the cold shrink head 1 and the cable. The tape overlap rate should not be less than 50%, and it should extend to cover the end of the rubber sleeve 101 by 50mm to further strengthen the edge seal. For installation in high humidity environments, a layer of silicone sealant can be pre-applied to the inner wall of the rubber sleeve 101 to improve the water vapor barrier capability.

[0042] Post-operation maintenance and adjustment: If the sealing performance decreases due to rubber aging during outdoor use, the bolt 4 can be loosened and the ring 3 can be rotated again to adjust the clamping force of the abutment 7: clockwise rotation increases the pressure and counterclockwise rotation decreases the pressure. After the operation is completed, the bolt 4 can be tightened again to achieve dynamic compensation of the sealing performance.

[0043] The present application has been described in detail above. Specific examples have been used to illustrate the principles and implementation methods of the present application. The description of the above embodiments is only for the purpose of helping to understand the method and core ideas of the present application. At the same time, for those skilled in the art, there will be changes in the specific implementation methods and application scope based on the ideas of the present application. Therefore, the content of this specification should not be construed as a limitation of the present application.

Claims

1. A moisture-proof cold-shrink cable connector, characterized in that, include: Cold shrink head (1), the cold shrink head (1) is a core sealing component, both ends of which are integrally formed with mounting sleeves (2) by injection molding; the outer peripheral wall of the mounting sleeve (2) is rotatably connected with a ring (3), and the inner ring wall of the ring (3) is integrally formed with a first toothed ring (301); Turntable (5), the inner side of the ring (3) is coaxially provided with turntable (5), the end face of turntable (5) is uniformly provided with arc groove (501) along the circumferential direction, the outer ring wall of turntable (5) is integrally formed with second gear ring (502), the second gear ring (502) meshes with the first gear ring (301) to form a gear transmission pair; Mounting sleeve (2), the mounting sleeve (2) is fixed with a limiting plate (6) near the inner wall of the turntable (5), and the limiting plate (6) is uniformly provided with radial straight grooves (601) along the circumference. The limiting plate (6) has a stop block (7) on its inner side. Each stop block (7) has a movable part (702) integrally formed on its outer wall. The movable part (702) passes through the straight groove (601) and the arc groove (501) at the corresponding position to form a sliding fit.

2. The moisture-proof cold-shrink cable connector as described in claim 1, characterized in that: The cold shrink head (1) includes a rubber sleeve (101), a telescopic sleeve (102) and a support tube (103). The two ends of the telescopic sleeve (102) are integrally formed with rubber sleeves (101). The support tube (103) is inserted into the inner cavity of the rubber sleeve (101) and the telescopic sleeve (102). The support tube (103) has a hollow tubular structure.

3. A moisture-proof cold-shrink cable connector as described in claim 2, characterized in that: The inner wall of the ring (3) has a smooth annular limiting groove (302), which forms a low-friction fit with the limiting disk (6) through the annular limiting groove (302).

4. A moisture-proof cold-shrink cable connector as described in claim 3, characterized in that, Also includes: Bolt (4) is threaded on the radial wall of the ring (3). The end of the bolt (4) passes through the ring (3) and abuts against the outer peripheral wall of the mounting sleeve (2). The circumferential positioning of the ring (3) is achieved by the friction force generated by tightening the bolt (4).

5. A moisture-proof cold-shrink cable connector as described in claim 4, characterized in that, Also includes: The buffer pad (701) is fixed to the end of the abutment (7) facing the rubber sleeve (101) by adhesive bonding. The buffer pad (701) is made of silicone rubber and its surface has a slightly convex arc structure.

6. A moisture-proof cold-shrink cable connector as described in claim 5, characterized in that: The moving part (702) has a cylindrical structure and its outer surface is covered with a self-lubricating coating. This coating forms a low-friction fit with the contact parts of the straight groove (601) and the arc groove (501).

7. A moisture-proof cold-shrink cable connector as described in claim 6, characterized in that: The rubber sleeve (101) and the telescopic sleeve (102) are integrally molded from EPDM rubber, and the support tube (103) is made of a high-molecular polymer material with memory properties.

8. A moisture-proof cold-shrink cable connector as described in claim 7, characterized in that: The inner wall of the telescopic sleeve (102) has a corrugated pleated structure, and the pleat direction is consistent with the cable axis.

9. A moisture-proof cold-shrink cable connector as described in claim 8, characterized in that: The turntable (5) and the limiting plate (6) form a dynamic and static fit structure. When the turntable (5) rotates, the inclined groove wall of the arc groove (501) generates radial thrust through sliding contact with the moving part (702). Under the guidance and constraint of the straight groove (601) of the limiting plate (6), the abutment (7) can only make radial linear movement along the straight groove (601).

10. A moisture-proof cold-shrink cable connector as described in claim 9, characterized in that: The turntable (5) has six arc grooves (501) evenly distributed along the circumference, and the limiting plate (6) has six straight grooves (601) correspondingly opened. Each set of arc grooves (501) and straight grooves (601) is connected to a stop block (7) to form six sets of circumferentially symmetrical pressure units.

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