A cable heat shrink end seal structure

Abstract

This application discloses a cable heat-shrinkable end sealing structure. A heat-shrinkable tube covers the periphery of the cable end joint. A filler layer is located between the heat-shrinkable tube and the cable end joint. An mounting sleeve surrounds the periphery of the heat-shrinkable tube. The movable end of the first half is hinged to one end of the second half, and the fixed end of the first half is fixedly disposed at the other end of the second half, forming a constraint space. The working ends of two sets of compensation components move closer to or further away from the periphery of the heat-shrinkable tube and are interference-fitted with the periphery of the heat-shrinkable tube. In this application, the mounting sleeve forms an adjustable constraint space through the hinged connection between the first and second halves. By adjusting the interference fit between the working ends of the two sets of compensation components and the periphery of the heat-shrinkable tube, the difference in shrinkage rate between the heat-shrinkable tube and the cable is actively compensated for during temperature changes, effectively offsetting the material deformation caused by temperature fluctuations and maintaining tight contact at the sealing interface, thereby ensuring the sealing effect between the cable ends.

Description

Technical Field

[0001] This application relates to the field of cable safety protection technology, and in particular to a cable heat shrinkable end sealing structure. Background Technology

[0002] A cable is a conductor made of one or more insulated conductors and an outer insulating protective layer, used to transmit electricity or information from one point to another. It is typically a rope-like cable composed of several or groups of conductors (at least two conductors per group) twisted together, with each group of conductors insulated from each other and often twisted around a central core, all covered by a highly insulating outer layer. During periods of fluctuating temperatures and warming weather, cable termination failures frequently occur in electrical systems, leading to system shutdowns.

[0003] The core cause, as determined by investigation, is that the heat shrink tubing used in existing cable heat shrink terminals is mostly made of polyolefin materials. These materials are prone to softening at high temperatures and becoming brittle at low temperatures. The mismatch in shrinkage rates during temperature fluctuations leads to inadequate sealing between the heat shrink tubing and the cable, creating gaps. Cold air then intrudes, forming moisture that accumulates over time, reducing the insulation performance of the cable terminal, damaging the internal insulation structure, and ultimately causing the cable terminal to break down, thus affecting the stable operation of the production system.

[0004] Therefore, there is an urgent need for a cable heat-shrinkable end sealing structure to solve the above problems. Utility Model Content

[0005] This application provides a cable heat-shrinkable end sealing structure to ensure the sealing effect of cable joints.

[0006] To achieve the above objectives, this application provides the following technical solutions:

[0007] A heat-shrinkable cable end sealing structure includes a heat-shrinkable tube, a filler layer, an mounting sleeve, and two sets of compensation components;

[0008] The heat shrink tubing is wrapped around the periphery of the cable connector.

[0009] The filler layer is located in the annular gap between the heat shrink tubing and the cable connector;

[0010] The mounting sleeve is arranged around the periphery of the heat shrink tubing. The mounting sleeve includes a first half and a second half. The movable end of the first half is hinged to one end of the second half, and the fixed end of the first half is fixedly disposed at the other end of the second half, forming a constraint space.

[0011] The two sets of compensation components are respectively installed on the periphery of the first half and the second half. The working ends of the two sets of compensation components are close to or far from the periphery of the heat shrink tubing and are interference-fitted with the periphery of the heat shrink tubing.

[0012] Furthermore, the compensation assembly includes at least two connecting rods, a connecting plate, at least two elastic elements, and a pressing plate;

[0013] The inner ends of the two connecting rods are spaced apart within the constraint area formed by the first half and the second half, and their outer ends extend to the outside of the constraint area formed by the first half and the second half. The periphery of the two connecting rods is threadedly connected to the periphery of the first half and the second half.

[0014] The connecting plate is fixedly disposed at the inner end of the two connecting rods, and the length of the connecting plate is consistent with the axial length of the heat shrink tubing.

[0015] One end of each of the two elastic elements is spaced apart on the side of the connecting plate away from the connecting rod, and the other end is close to the side where the cable mating end is located;

[0016] The pressing plate is fixedly disposed at one end of the two elastic elements away from the connecting plate. The length of the pressing plate is the same as the length of the connecting plate, and the surface of the pressing plate is in contact with part of the circumferential surface of the heat shrink tubing.

[0017] Furthermore, the surface of the heat shrink tubing is coated with a nano-waterproof layer, which is formed by mixing and curing nano-silica particles with organosilicon resin.

[0018] Furthermore, the pressing plate has multiple protrusions on the side surface near the heat shrink tubing, and the peripheral surfaces of the protrusions abut against the peripheral surfaces of the heat shrink tubing.

[0019] Furthermore, a positioning plate extends from the fixed end of the first half to one side of the second half, and a positioning groove is recessed at one end of the second half near the fixed end of the first half, with the plate surface of the positioning plate abutting against the groove wall of the positioning groove.

[0020] Furthermore, at least two caps are fixedly provided on the periphery of the first half and the second half, and the two caps are covered on the outer ends of the corresponding connecting rods.

[0021] One or more technical solutions provided in the embodiments of this utility model have at least the following technical effects or advantages:

[0022] In this application, the heat shrink tubing directly covers the cable joint end, providing basic sealing protection. The filler layer is located in the annular gap between the heat shrink tubing and the cable, used to eliminate initial assembly gaps and buffer deformation. The mounting sleeve forms an adjustable constraint space through the hinged connection of the first half and the second half, which facilitates assembly and can accommodate different cable sizes. Two sets of compensation components act on both sides of the mounting sleeve. By adjusting the interference fit between the working end and the circumference of the heat shrink tubing, the components actively compensate for the shrinkage rate difference between the heat shrink tubing and the cable when the temperature changes: when the heat shrink tubing shrinks due to low temperature, the compensation components apply pressure towards the heat shrink tubing to maintain contact; when it expands due to high temperature, the compensation components adjust in the opposite direction to avoid excessive compression, effectively offsetting the material deformation caused by temperature fluctuations, continuously maintaining tight contact at the sealing interface, blocking the intrusion path of moisture, and thus ensuring the sealing effect between the cable joint ends. Attached Figure Description

[0023] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments of this utility model or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0024] Figure 1 This is a structural schematic diagram of the assembled state provided in the embodiments of this application;

[0025] Figure 2 for Figure 1 A magnified view of a portion of region A in the middle;

[0026] Figure 3 This is a schematic diagram of the structure of the first half of the body provided in an embodiment of this application;

[0027] Figure 4 This is a schematic diagram of the structure of the second half provided in an embodiment of this application.

[0028] Icons: 1-Cable connector; 10-Heat shrink tubing; 11-Filling layer; 20-Mounting sleeve; 21-First half; 211-Positioning plate; 22-Second half; 221-Positioning groove; 23-Cap; 30-Compensation component; 31-Connecting rod; 32-Connecting plate; 33-Elastic element; 34-Pressing plate; 35-Protrusion. Detailed Implementation

[0029] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some, not all, of the embodiments of the present utility model. Based on the embodiments of the present utility model, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present utility model.

[0030] In the description of the embodiments of this utility model, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the accompanying drawings and are only for the convenience of describing the embodiments of this utility model and simplifying the description. They 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, and therefore should not be construed as a limitation of this utility model. The terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance. In addition, the terms "installed," "connected," and "linked" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal connection of two components. For those skilled in the art, the specific meaning of the above terms in the embodiments of this utility model can be understood according to the specific circumstances.

[0031] Combination Figures 1-4 As shown, a cable heat-shrinkable end sealing structure includes a heat-shrinkable tube 10, a filler layer 11, an mounting sleeve 20, and two sets of compensation components 30. The heat-shrinkable tube 10 covers the periphery of the cable connector 1. The filler layer 11 is located in the annular gap between the heat-shrinkable tube 10 and the cable connector 1. The mounting sleeve 20 surrounds the periphery of the heat-shrinkable tube 10 and includes a first half 21 and a second half 22. The movable end of the first half 21 is hinged to one end of the second half 22, and the fixed end of the first half 21 is fixedly disposed at the other end of the second half 22, forming a constraint space. The two sets of compensation components 30 are respectively installed on the periphery of the first half 21 and the second half 22. The working ends of the two sets of compensation components 30 are close to or away from the periphery of the heat-shrinkable tube 10 and are interference-fitted with the periphery of the heat-shrinkable tube 10.

[0032] In the above scheme, the heat shrink tubing 10 directly covers the cable connector 1 to provide basic sealing protection; the filler layer 11 is located in the annular gap between the heat shrink tubing 10 and the cable, used to eliminate the initial assembly gap and buffer deformation. The mounting sleeve 20 forms an adjustable constraint space through the hinged connection of the first half 21 and the second half 22, which is convenient for assembly and can adapt to different cable sizes. Two sets of compensation components 30 act on both sides of the mounting sleeve 20 respectively. By adjusting the interference fit between the working end and the circumference of the heat shrink tubing 10, the compensation components 30 actively compensate for the shrinkage rate difference between the heat shrink tubing 10 and the cable when the temperature changes: when the heat shrink tubing 10 shrinks due to low temperature, the compensation components 30 apply pressure to the heat shrink tubing 10 to maintain contact; when it expands due to high temperature, the compensation components 30 adjust in the opposite direction to avoid excessive compression, effectively offsetting the material deformation caused by temperature alternation, continuously maintaining tight contact of the sealing interface, blocking the intrusion path of water vapor, thereby ensuring the sealing effect between the cable connectors 1.

[0033] The compensation component 30 includes at least two connecting rods 31, a connecting plate 32, at least two elastic elements 33, and a pressing plate 34. The inner ends of the two connecting rods 31 are spaced apart within the constraint area formed by the first half-body 21 and the second half-body 22, and their outer ends extend to the outside of the constraint area formed by the first half-body 21 and the second half-body 22. The peripheries of the two connecting rods 31 are threadedly connected to the peripheries of the first half-body 21 and the second half-body 22. The connecting plate 32 is fixedly mounted on the two connecting rods 31. The connecting rod 31 is located at its inner end, and the length of the connecting plate 32 is the same as the axial length of the heat shrink tubing 10. One end of each of the two elastic elements 33 is spaced apart on the side of the connecting plate 32 away from the connecting rod 31, and the other end is close to the side where the cable connector 1 is located. The pressing plate 34 is fixedly disposed at the end of each of the two elastic elements 33 away from the connecting plate 32. The length of the pressing plate 34 is the same as the length of the connecting plate 32, and the surface of the pressing plate 34 is in contact with a portion of the circumferential surface of the heat shrink tubing 10.

[0034] In the above scheme, the connecting rod 31 adjusts its position within the constrained area via a threaded connection, thereby controlling the initial distance between the connecting plate 32 and the heat shrink tubing 10. The elastic element 33 forms a flexible support between the connecting plate 32 and the pressing plate 34. When the heat shrink tubing 10 deforms due to temperature changes, the elastic element 33's expansion and contraction characteristics adaptively compensate for the shrinkage or expansion, ensuring that the pressing plate 34 always applies uniform interference pressure to the heat shrink tubing 10. The pressing plate 34 is in contact with the circumference of the heat shrink tubing 10, and its length is equal to that of the connecting plate 32. This arrangement ensures sealing contact along the entire axial length, avoiding seal failure caused by localized stress concentration. Through the combined effects of the mechanical adjustment of the threaded connecting rod 31 and the elastic compensation of the elastic element 33, a sealing pressure maintenance mechanism that dynamically adapts to the deformation of the heat shrink tubing 10 is formed.

[0035] The surface of the heat shrink tubing 10 is coated with a nano waterproof layer, which is formed by mixing and curing nano silica particles with organosilicon resin.

[0036] In the above solution, a nano-waterproof layer is formed on the surface of the heat shrink tubing 10. This combines the high specific surface area of ​​nano-silica particles with the flexibility of silicone resin to create a dense, deformable composite protective layer. The nano-silica particles fill the molecular gaps in the silicone resin, forming a continuous, non-porous film structure through the curing process, effectively blocking the penetration path of water molecules. The silicone resin, as a flexible matrix material, can elastically deform in sync with the thermal expansion and contraction of the heat shrink tubing 10, preventing cracking or peeling of the waterproof layer from the matrix due to alternating temperature changes. The synergistic effect of the two materials ensures both the chemical stability of the waterproof layer and maintains its thermodynamic compatibility with the heat shrink tubing 10 half-body material, continuously maintaining interfacial bonding strength under temperature cycling conditions.

[0037] The pressing plate 34 has a plurality of protrusions 35 on one side of the plate near the heat shrink tube 10, and a portion of the peripheral surface of the protrusions 35 abuts against the peripheral surface of the heat shrink tube 10.

[0038] In the above scheme, multiple protrusions 35 are provided on the surface of the pressing plate 34 that contacts the heat shrink tubing 10. The structure of the protrusions 35 increases the local pressure distribution on the contact surface, making the pressure of the pressing plate 34 on the heat shrink tubing 10 more uniform. Part of the circumferential surface of the protrusions 35 abuts against the heat shrink tubing 10, which can disperse the shrinkage or expansion stress of the heat shrink tubing 10 caused by temperature changes through multi-point contact, and can also compensate for the gap between the heat shrink tubing 10 and the pressing plate 34 through the elastic deformation of the protrusion structure. This maintains a stable interference fit during temperature alternation, avoids moisture intrusion due to local seal failure, and thus increases the sealing effect of the cable connector 1.

[0039] A positioning plate 211 extends from the fixed end of the first half 21 toward one side of the second half 22. A positioning groove 221 is recessed at one end of the second half 22 near the fixed end of the first half 21. The surface of the positioning plate 211 is in contact with the groove wall of the positioning groove 221.

[0040] In the above scheme, when the positioning plate 211 is inserted into the positioning groove 221, the full contact between the plate surface and the groove wall can eliminate the assembly gap and forcibly constrain the relative position of the two halves. This not only achieves axial positioning but also resists circumferential misalignment, ensuring the stability of the constrained space shape formed after the mounting sleeve 20 is closed, thereby ensuring uniform pressure applied by the compensation component 30 to the heat shrink tubing 10.

[0041] At least two caps 23 are fixedly provided around the periphery of the first half 21 and the second half 22, and the two caps 23 cover the outer ends of the corresponding connecting rods 31.

[0042] In the above scheme, at least two covers 23 are provided corresponding to the outer ends of the connecting rods 31 to ensure that the exposed part of each connecting rod 31 is completely covered, preventing the overall protection capability from decreasing due to the failure of a single cover 23. The fixed connection between the cover 23 and the mounting sleeve 20 enhances the overall structural integrity and prevents the cover 23 from falling off due to vibration or temperature changes, thereby ensuring the long-term stable operation of the compensation component 30.

[0043] The various embodiments in this specification are described in a progressive manner. For the same or similar parts between the various embodiments, please refer to each other. Each embodiment focuses on describing the differences from other embodiments.

[0044] The above embodiments are only used to illustrate the technical solutions of this application, and are not intended to limit this application. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of this application.

Claims

1. A cable heat-shrinkable end sealing structure, characterized in that, It includes heat shrink tubing (10), filler layer (11), mounting sleeve (20) and two sets of compensation components (30); The heat shrink tubing (10) covers the periphery of the cable connector (1); The filling layer (11) is located in the annular gap between the heat shrink tubing (10) and the cable connector (1); The mounting sleeve (20) surrounds the periphery of the heat shrink tubing (10). The mounting sleeve (20) includes a first half (21) and a second half (22). The movable end of the first half (21) is hinged to one end of the second half (22), and the fixed end of the first half (21) is fixedly disposed at the other end of the second half (22), thus forming a constraint space. The two sets of compensation components (30) are respectively installed on the periphery of the first half (21) and the second half (22). The working ends of the two sets of compensation components (30) are close to or far from the periphery of the heat shrink tube (10) and are interference-fitted with the periphery of the heat shrink tube (10).

2. The cable heat-shrinkable end sealing structure according to claim 1, characterized in that, The compensation component (30) includes at least two connecting rods (31), a connecting plate (32), at least two elastic elements (33), and a pressing plate (34); The inner ends of the two connecting rods (31) are spaced apart within the constraint area formed by the first half (21) and the second half (22), and their outer ends extend to the outside of the constraint area formed by the first half (21) and the second half (22). The periphery of the two connecting rods (31) is threadedly connected to the periphery of the first half (21) and the second half (22). The connecting plate (32) is fixedly disposed at the inner end of the two connecting rods (31), and the length of the connecting plate (32) is consistent with the axial length of the heat shrink tube (10); One end of each of the two elastic members (33) is spaced apart on the side of the connecting plate (32) away from the connecting rod (31), and the other end is close to the side where the cable docking end (1) is located; The pressing plate (34) is fixedly disposed at one end of the two elastic elements (33) away from the connecting plate (32). The length of the pressing plate (34) is the same as the length of the connecting plate (32), and the surface of the pressing plate (34) is in contact with part of the circumferential surface of the heat shrink tube (10).

3. The cable heat-shrinkable end sealing structure according to claim 1, characterized in that, The heat shrink tubing (10) is coated with a nano waterproof layer, which is formed by mixing and curing nano silica particles with organosilicon resin.

4. The cable heat-shrinkable end sealing structure according to claim 2, characterized in that, The pressing plate (34) has a plurality of protrusions (35) on one side of the plate near the heat shrink tube (10), and a portion of the circumferential surface of the protrusions (35) abuts against the circumferential surface of the heat shrink tube (10).

5. The cable heat-shrinkable end sealing structure according to claim 1, characterized in that, A positioning plate (211) extends from the fixed end of the first half (21) toward one side of the second half (22). A positioning groove (221) is recessed at one end of the second half (22) near the fixed end of the first half (21). The surface of the positioning plate (211) is in contact with the groove wall of the positioning groove (221).

6. The cable heat-shrinkable end sealing structure according to claim 2, characterized in that, At least two caps (23) are fixedly provided on the periphery of the first half (21) and the second half (22), and the two caps (23) cover the outer ends of the corresponding connecting rods (31).

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