A cable splice

Abstract

This utility model relates to a cable fusion splice, comprising two cables to be connected. The cores of the two cables are connected by a heat-fusion section, and the inner sheaths of the two cables are connected by a waterproof layer. The waterproof layer includes a pressure-resistant sleeve fitted outside the heat-fusion section, and the inside of the pressure-resistant sleeve is filled with hot-melt expanding adhesive. The two ends of the pressure-resistant sleeve are sealed by sealing plugs arranged around the outside of the inner sheath. The pressure-resistant sleeve is a stainless steel corrugated pipe. A protective layer is provided on the outside of the pressure-resistant sleeve. The protective layer is a ceramicized silicone rubber tape wrapped around the outside of the pressure-resistant sleeve. This utility model uses a pressure-resistant sleeve and its internal hot-melt expanding adhesive to form a double-layer composite sealing structure, replacing the original waterproof tape layer. This not only improves the pressure resistance of the splice, but also the hot-melt expanding adhesive automatically fills the gaps when heated, effectively improving the sealing effect. This makes the splice less prone to water seepage under soil settlement, reducing the occurrence of failures due to water seepage.

Description

Technical Field

[0001] This utility model relates to a cable fusion splice. Background Technology

[0002] Cross-linked cables, short for cross-linked polyethylene insulated cables, are suitable for power transmission and distribution lines with AC voltage of 500kV and below. Currently, the vast majority of high-voltage cables in my country use cross-linked polyethylene insulated cables. However, due to limitations in production and transportation conditions, the length of a single cross-linked cable is restricted, making it impossible to meet the requirements during circuit laying. Therefore, during installation, multiple cross-linked cables are often connected end-to-end.

[0003] Chinese Patent Publication No. CN213585124U discloses a cross-linked cable fusion-molded straight-through connector, comprising two cables whose cores are connected by a heat-fusion section. The heat-fusion section is provided with, from the inside out, a heat-fusion shielding layer, a heat-fusion insulation layer, and a heat-fusion semi-conductive layer. The heat-fusion shielding layer completely encloses the exposed portions of the heat-fusion section and the two cable cores. The cable core shielding layers are connected through the heat-fusion shielding layer. The heat-fusion insulation layer completely encloses the heat-fusion shielding layer. The cable core insulation layers are connected through the heat-fusion insulation layer. The heat-fusion semi-conductive layer completely encloses the heat-fusion insulation layer. The inner sheaths of the two cables are connected by a waterproof tape layer. This patent has a compact structure that does not affect the original performance. The completed connector is completely identical to the original cable structure and forms a single unit. It eliminates operational accidents caused by material differences, moving interfaces, and other factors between traditional connectors and cables, greatly improving electrical reliability and effectively solving the problem of frequent accidents associated with traditional connectors.

[0004] However, in practical use, the corrosion-resistant sealing of the joints relies mainly on the waterproof tape layer. Since the joints are buried in the soil, the waterproof tape layer is prone to water seepage under soil settlement conditions, leading to malfunctions. Therefore, it is necessary to improve this technical problem. Utility Model Content

[0005] This utility model addresses the problems existing in the prior art by providing a cable fusion splice.

[0006] To achieve the above objectives, the technical solution adopted by this utility model is: a cable fusion splice, comprising two cables to be connected, the cores of the two cables being connected by a heat-fusion section, and the inner sheaths of the two cables being connected by a waterproof layer, wherein the waterproof layer includes a pressure-resistant sleeve sleeved outside the heat-fusion section, and the inside of the pressure-resistant sleeve is provided with heat-melting expansion adhesive.

[0007] Furthermore, the two ends of the pressure-resistant sleeve are sealed by sealing plugs that are circumferentially disposed on the outside of the inner sheath.

[0008] Furthermore, the pressure-resistant sleeve is a stainless steel corrugated pipe.

[0009] Furthermore, a protective layer is provided on the outer side of the pressure-resistant sleeve.

[0010] Furthermore, the protective layer is a ceramicized silicone rubber strip wrapped around the outside of the pressure-resistant sleeve.

[0011] Furthermore, the hot melt expanding adhesive is located on the outside of the copper mesh sleeve between the copper shielding layers of the two cables.

[0012] Furthermore, the sealing plug is in the shape of a stepped shaft, with the small-diameter end of the sealing plug extending into the port of the pressure-resistant sleeve, and the large-diameter end face of the sealing plug fitting against the end face of the pressure-resistant sleeve.

[0013] Furthermore, the cores of both cables are tapered at adjacent ends at a 30° angle and are wrapped by a heat-fused section.

[0014] Compared with the prior art, the present invention has the following advantages: The present invention is reasonably designed and uses a pressure-resistant sleeve and its internal hot melt expansion adhesive to form a double-layer composite sealing structure, replacing the original waterproof tape layer. This not only improves the pressure resistance of the joint, but also the hot melt expansion adhesive automatically fills the gaps when heated, effectively improving the sealing effect. This makes the joint less prone to water seepage under soil settlement, reducing the occurrence of failures due to water seepage. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the front cross-sectional structure of an embodiment of the present utility model; Figure 2 This is a cross-sectional structural diagram of the waterproof layer in an embodiment of this utility model; Figure 3 yes Figure 2 Enlarged diagram of point A in the diagram; Figure 4 yes Figure 1 Enlarged diagram of point B in the image.

[0016] In the picture: 1-Cable; 2-Cable core; 3-Hot melt section; 4-Waterproof layer; 5-Pressure-resistant sleeve; 6-Hot melt expansion adhesive; 7-Sealing plug; 71-Large diameter end; 72-Small diameter end; 8-Protective layer; 9-Copper shielding layer; 10-Copper mesh sleeve; 11-Tapered section; 12-Inner sheath. Detailed Implementation

[0017] The present invention will now be described in further detail with reference to the accompanying drawings and specific embodiments.

[0018] In the description of this utility model, it should be understood that the terms "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model 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, they should not be construed as limitations on this utility model.

[0019] like Figures 1-4 As shown, this utility model discloses a cable fusion splice, which is an improvement on a cross-linked cable fusion molding straight-through splice disclosed in Chinese Patent Publication No. CN213585124U. It aims to solve the problem of water seepage in the waterproof tape layer under soil settlement conditions. The structure includes two cables 1 to be connected. The cores 2 of the two cables 1 are connected by a heat-fusion section 3, and the inner sheaths 12 of the two cables 1 are connected by a waterproof layer 4. This part of the structure is the same as the cross-linked cable fusion molding straight-through splice disclosed in CN213585124U. The specific improvement of this cable fusion splice is that the waterproof layer 4 includes a pressure-resistant sleeve 5 sleeved outside the heat-fusion section 3. The pressure-resistant sleeve 5 is filled with a hot-melt expansion adhesive 6. The pressure-resistant sleeve 5 and the hot-melt expansion adhesive 6 inside form a double-layer composite sealing structure, replacing the original waterproof tape layer. The pressure-resistant sleeve can withstand mechanical compression, and the hot-melt expansion adhesive automatically fills the gaps when heated. In other words, this cable fusion joint not only improves the joint's pressure resistance, but also the hot-melt expansion adhesive automatically fills the gaps when heated, effectively improving the sealing effect. This makes the joint less prone to water seepage under soil settlement, reducing the occurrence of failures due to water seepage.

[0020] In this embodiment, to improve the sealing effect, the two ends of the pressure-resistant sleeve 5 are sealed by rubber sealing plugs 7 arranged around the outer side of the inner sheath 12. Specifically, the sealing plug 7 is stepped shaft-shaped, with the small-diameter end 72 extending into the port of the pressure-resistant sleeve 5, and the large-diameter end 71 of the sealing plug 7 fitting against the end face of the pressure-resistant sleeve 5. Although there is still a gap between the sealing plug and the pressure-resistant sleeve when the sealing plug is inserted into the port, the hot-melt expanding adhesive fills the gap after heating, ensuring the sealing effect.

[0021] In this embodiment, the pressure-resistant sleeve 5 is a stainless steel corrugated pipe. If a stainless steel corrugated hose is used, it has good anti-extrusion performance and improves the overall structural strength of the weld joint.

[0022] In this embodiment, a protective layer 8 is provided on the outer side of the pressure-resistant sleeve 5. Preferably, the protective layer 8 is a ceramicized silicone rubber tape wrapped around the outer side of the pressure-resistant sleeve 5. Ceramicized silicone rubber is a polymer composite material that can be converted into ceramic material at high temperatures. It is mainly used in the manufacture of fire-resistant wires and cables and has excellent fire-resistant, flame-retardant, low-smoke, and non-toxic properties.

[0023] In this embodiment, the hot melt expanding adhesive 6 is located outside the copper mesh sleeve 10 between the copper shielding layers 9 of the two cables 1.

[0024] In this embodiment, the cable cores 2 of the two cables 1 are both tapered at adjacent ends, forming a tapered portion 11, which is then wrapped by a heat-fused portion. The end face of the cable core is machined into a 30° tapered shape, which can effectively reduce electric field concentration.

[0025] In this embodiment, the surface of the hot-melt part 3 is sprayed with an Al2O3 insulating layer to improve its arc resistance.

[0026] It should be noted that this utility model is an improvement on the cross-linked cable fusion-molded straight connector disclosed in Chinese Patent Publication No. CN213585124U. The main improvement is to replace the original waterproof tape layer with a pressure-resistant sleeve, a hot-melt expansion adhesive inside the pressure-resistant sleeve, and a protective layer outside the pressure-resistant sleeve. This aims to solve the problem of water seepage in the waterproof tape layer under soil settlement conditions. The remaining undisclosed structures and connection relationships are the same as those disclosed in Chinese Patent Publication No. CN213585124U, and will not be repeated here.

[0027] If this utility model discloses or relates to mutually fixedly connected parts or structural components, then, unless otherwise stated, a fixed connection can be understood as: a detachable fixed connection (e.g., using bolts or screws), or a non-detachable fixed connection (e.g., riveting, welding). Of course, mutually fixed connections can also be replaced by an integral structure (e.g., manufactured using a casting process) (except where it is obviously impossible to use an integral forming process).

[0028] In addition, unless otherwise stated, the terms used to indicate positional relationships or shapes in any of the technical solutions disclosed in this utility model above include states or shapes that are similar to, close to, or approximate with them.

[0029] Any component provided by this utility model can be assembled from multiple individual components, or it can be a single component manufactured by a one-piece molding process.

[0030] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of this utility model and not to limit it; although the utility model has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications can still be made to the specific implementation of this utility model or equivalent substitutions can be made to some technical features without departing from the spirit of the technical solution of this utility model, and all such modifications and substitutions should be covered within the scope of the technical solution claimed by this utility model.

Claims

1. A cable fusion splice, comprising two cables to be connected, wherein the cores of the two cables are connected by a heat-fusion section, and the inner sheaths of the two cables are connected by a waterproof layer, characterized in that: The waterproof layer includes a pressure-resistant sleeve fitted over the outside of the hot-melt section, and the inside of the pressure-resistant sleeve is provided with hot-melt expanding adhesive.

2. A cable fusion splice according to claim 1, characterized in that: The two ends of the pressure-resistant sleeve are sealed by sealing plugs that are arranged around the outside of the inner sheath.

3. A cable fusion splice according to claim 1, characterized in that: The pressure-resistant sleeve is a stainless steel corrugated pipe.

4. A cable fusion splice according to claim 1 or 3, characterized in that: The outer side of the pressure-resistant sleeve is provided with a protective layer.

5. A cable fusion splice according to claim 4, characterized in that: The protective layer is a ceramicized silicone rubber tape wrapped around the outside of the pressure-resistant sleeve.

6. A cable fusion splice according to claim 1, characterized in that: The hot melt expanding adhesive is located on the outside of the copper mesh sleeve between the copper shielding layers of the two cables.

7. A cable fusion splice according to claim 2, characterized in that: The sealing plug is in the shape of a stepped shaft, with the small-diameter end of the sealing plug extending into the port of the pressure-resistant sleeve, and the large-diameter end face of the sealing plug fitting against the end face of the pressure-resistant sleeve.

8. A cable fusion splice according to claim 1, characterized in that: The cores of both cables are tapered at an adjacent end at a 30° angle and are wrapped by a heat-fused section.

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