Composite cable joint

Abstract

The utility model discloses a composite cable joint, which comprises a copper sleeve, an insulating layer, a waterproof layer, a fireproof and explosion-proof bag and an explosion-proof net, the copper sleeve is composed of a first sleeve body and a second sleeve body which are separated and matched with each other, and a first cable core and a second cable core to be connected are clamped in the first sleeve body and the second sleeve body. The copper sleeve is provided with a tightening groove at the connection position of the first cable core and the second cable core, and the tightening groove is provided with a tightening ring. The beneficial effects of the utility model are that the structure is simple and stable, the copper sleeve composed of two separated halves is adopted to connect two cables, the conductive performance is ensured, the construction convenience is also improved, and the copper sleeve can be fixed in advance during construction by arranging the tightening ring on the copper sleeve, so that the construction efficiency is improved. Scattering and displacement of the copper sleeve or loosening and displacement of the two cable cores during construction are avoided, and reliability and conductivity of connection are guaranteed while follow-up construction is facilitated.

Description

Technical Field

[0001] The utility model relates to the technical field of power grid construction, in particular to a composite cable joint. Background Art

[0002] With the development of power grids and the transformation of urban networks, the proportion of cables in power grid lines is increasing, and the corresponding cable failure rate is also increasing. The cable joint is the weakest link of the cable, with a high probability of failure. Once the cable joint explodes and catches fire, it may cause cable group damage, leading to large-scale power outages, or even spontaneous combustion and explosions causing fires. In addition, the cable must be reconnected to restore power supply in the event of a break. At present, most prefabricated cable intermediate joints are used to be assembled on site and installed on the cable body to restore the connection between the two cables. However, the wire cores of this type of connector are mostly mechanically connected by crimping or bolt-twisting, and the contact resistance at the connection is large, which can easily cause heat. In addition, this connection method is prone to the problem of eccentricity between the main cores of the two cables, which can easily lead to the following faults: 1. There is an air gap inside, which causes local discharge and spreads and deteriorates, leading to insulation breakdown; 2. Moisture absorption or water ingress, the breathing effect and electrophoresis effect of water or moisture penetrate into the middle joint, the interface resistance drops sharply, and surface discharge is stimulated; 3. The insulation strength is reduced or aged, and it is discharged and carbonized in a dendritic manner, resulting in creepage electrical breakdown; thereby reducing the reliability of the power system and restricting the safe operation of the cable system.

[0003] In order to solve the above-mentioned defects of the prior art, the applicant disclosed a composite cable joint in a Chinese utility model patent application with publication number CN113745858A, which includes a copper sleeve and an insulating layer. The copper sleeve is sheathed on the first cable core and the second cable core to be connected, one end of the copper sleeve is welded to the first cable core by interference fit, and the other end of the copper sleeve is fixedly connected to the second cable core by rivets, and the insulating layer is wrapped around the outer layer of the copper sleeve. Although the design structure is simple and stable, and can be easily installed, an explosion-proof outer sheath is arranged outside the insulating layer, so that it has good fireproof and explosion-proof performance. However, there are the following defects: the copper sleeve and the cable core are easy to fall off or slide incorrectly during construction, resulting in a decrease in the connection qualification rate, and may also cause poor connection conductivity defects. Utility Model Content

[0004] The utility model aims to provide a composite cable joint which improves the connection qualification rate and does not affect the construction convenience and work efficiency in view of the above-mentioned deficiencies in the prior art.

[0005] The utility model solves the technical problem by adopting the following technical scheme: a composite cable joint, comprising a copper sleeve, an insulating layer, a waterproof layer, a fireproof and explosion-proof bag and an explosion-proof net, wherein the copper sleeve is composed of a first sleeve body and a second sleeve body which are separated and matched with each other, wherein the first sleeve body and the second sleeve body clamp two first cable cores and the second cable cores to be connected, so that the inner walls of the first sleeve body and the second sleeve body are closely fitted with the outer walls of the first cable core and the second cable core; the insulating layer wraps the outer sides of the copper sleeve, the first cable core and the second cable core, the waterproof layer is wrapped around the outer side of the insulating layer, the fireproof and explosion-proof bag is wrapped around the outer side of the waterproof layer, the explosion-proof net is tied to the fireproof and explosion-proof bag, the copper sleeve is respectively provided with a tightening groove at the connection between the first cable core and the second cable core, and a tightening ring is provided on the tightening groove, and the tightening ring fixes the first sleeve body and the second sleeve body of the copper sleeve on the first cable core and the second cable core, and will not loosen or scatter to affect the reliability of the subsequent fixing process such as welding and the connection.

[0006] The inner walls of the first and second sleeves of the copper sleeve are provided with at least two rows of frosted surfaces respectively contacting the surfaces of the first cable core and the second cable core, and the frosted surfaces are used to increase the friction with the contact surfaces of the first cable core and the second cable core to avoid displacement during construction, ensure that the first cable core and the second cable core can be in perfect alignment and contact, and ensure the conductivity at the joint.

[0007] Preferably, the wall thickness of the copper sleeve is preferably 0.8-2.5 mm.

[0008] Preferably, the depth of the tightening groove is 0.3-0.5 mm and the width is 5-15 mm.

[0009] Preferably, the tight hoop is a copper ring with a thickness of 0.5-1 mm.

[0010] The first sleeve body and the second sleeve body may be fixed to the first cable core and the second cable core by welding, thereby ensuring connection reliability and electrical conductivity.

[0011] Preferably, the waterproof layer is formed by wrapping waterproof tape or waterproof plastic cloth, and its thickness is between 0.2-2 mm, which is used to improve the waterproof effect and prevent explosion caused by short circuit.

[0012] Preferably, the fireproof and explosion-proof bag is made of a flexible fireproof material, the fireproof and explosion-proof bag is provided with an explosion-proof cavity for accommodating the copper sleeve and the insulating layer, the fireproof and explosion-proof bag is provided with a plurality of folds, the folds expand under external force to enlarge the explosion-proof cavity, thereby achieving the purpose of explosion-proof.

[0013] Preferably, the explosion-proof net includes a plurality of wire ropes, a plurality of hoops and binding ropes, the wire ropes are arranged in parallel, all the hoops are arranged in an array with staggered intervals, two adjacent wire ropes pass through the hoops, and when the wire ropes are stretched laterally, a mesh structure with a certain elastic contraction can be formed to achieve the purpose of explosion-proof buffering, the binding ropes are interspersed on the wire ropes, and the explosion-proof net is tied to the fire and explosion-proof bag.

[0014] Compared with the prior art, the utility model has the following beneficial effects: the structure is simple and stable, and the two cables are connected by a copper sleeve composed of two separate halves, which ensures the conductive performance while improving the construction convenience. Moreover, by arranging a tight hoop on the copper sleeve, the copper sleeve can be fixed in advance during construction to avoid the copper sleeve from scattering or shifting or the two cable cores from loosening and shifting during construction, thereby facilitating subsequent construction while ensuring the reliability and conductivity of the connection. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a schematic diagram of the cross-section structure of the composite cable connector of the utility model;

[0016] Figure 2 This is a schematic diagram of the explosion-proof harness structure of the utility model;

[0017] Figure 3 This is a diagram of the explosion-proof net of the utility model in use. DETAILED DESCRIPTION

[0018] The utility model is further described below in conjunction with the accompanying drawings. The copper sleeve described in this embodiment can also be replaced by a silver sleeve or an aluminum sleeve according to the conductivity requirements to match the material of the first cable core and the second cable core. Similarly, the rivet described in this embodiment can also be made of copper, silver, aluminum, etc.

[0019] A composite cable connector, such as Figure 1 As shown, it includes a copper sleeve 2, an insulating layer 3, a waterproof layer 4, a fireproof and explosion-proof bag 5 and an explosion-proof net 6. The copper sleeve 2 is composed of a first sleeve body and a second sleeve body that are separated and matched with each other. The first sleeve body and the second sleeve body clamp the two first cable cores 11 and the second cable cores 12 to be connected, and are welded and fixed by welding points 24, so that the inner walls of the first sleeve body and the second sleeve body are tightly fitted with the outer walls of the first cable 11 and the second cable core 12. Since the conductivity of the conductor is mostly transferred through the electrons on the metal surface, this can ensure good conductivity at the joint. The insulating layer 3 wraps around the outside of the copper sleeve, the first cable core 11 and the second cable core 12, the waterproof layer 4 is wrapped around the outside of the insulating layer 3, the fireproof and explosion-proof bag 5 is wrapped around the outside of the waterproof layer 4, and the explosion-proof net 6 is tied to the fireproof and explosion-proof bag 5.

[0020] The copper sleeve 2 is respectively provided with a tightening groove at the connection between the first cable core 11 and the second cable core 12, and a tightening ring 8 is provided on the tightening groove. The tightening ring 8 fixes the first sleeve body and the second sleeve body of the copper sleeve 3 on the first cable core 11 and the second cable core 12, so that the first sleeve body and the second sleeve body will not loosen or scatter to affect the subsequent welding and other fixing process construction and connection reliability, and at the same time, it can also prevent the first cable core 11 and the second cable core 12 from loosening during construction to affect the conductivity.

[0021] The inner walls of the first and second sleeves of the copper sleeve 2 are provided with at least two rows of frosted surfaces respectively contacting the surfaces of the first cable core 11 and the second cable core 12, and the frosted surfaces are used to increase the friction with the contact surfaces of the first cable core 11 and the second cable core 12 to avoid displacement during construction, ensure that the first cable core and the second cable core can be in perfect alignment and contact, and ensure the conductivity at the joint.

[0022] The wall thickness of the copper sleeve 2 is preferably 1-2 mm, preferably, the wall thickness of the copper sleeve 2 is 11.5 mm, which can well ensure the connection strength and have good ultrasonic weldability. The inner wall of the first and second sleeves and the outer wall of the first cable core 11 and the second cable core 12 are tightly fitted through welding points 24. Preferably, at least two welding points 24 are set between the inner wall of the first and second sleeves and the first cable core 11 and the second cable core 12 to ensure the connection reliability. The depth of the tight hoop groove is preferably 0.4 mm and the width is 10 mm. The tight hoop is a copper ring with a thickness of 0.8 mm. The copper has good ductility and can improve the fixing strength of the copper sleeve.

[0023] The insulating layer 3 can be made of cross-linked polyethylene, which forms a mesh structure after cross-linking. This structure has strong resistance to deformation even at high temperatures. Therefore, cross-linked polyethylene has excellent electrical properties, and the dielectric loss is smaller than that of polyvinyl chloride insulation. In addition, cables made of cross-linked polyethylene are very easy to lay.

[0024] The waterproof layer 4 is formed by wrapping waterproof tape or waterproof plastic cloth around the outside of the insulating layer 3, and its thickness is preferably 0.6 mm, which is used to improve the waterproof effect and prevent explosion caused by short circuit. Figure 2 As shown, the fireproof and explosion-proof bag 5 is made of a flexible fireproof material, and is provided with an explosion-proof cavity 50 for accommodating the insulating layer 3 of the cable connector. The fireproof and explosion-proof bag 5 is provided with a plurality of folds 51, which expand under external force to enlarge the explosion-proof cavity 50, thereby achieving the purpose of explosion-proof. Figure 3As shown, it includes a plurality of wire ropes, a plurality of hoops, a binding rope 63 and a plurality of lock buckles 64, the wire ropes are arranged in parallel, all the hoops are arranged in an array with staggered intervals, two adjacent wire ropes pass through the hoops, and when the wire ropes are stretched in the transverse direction, a mesh structure with a certain elastic contraction can be formed, the binding rope 63 is inserted into the wire ropes, and the explosion-proof net 6 is tied to the fireproof and explosion-proof bag 5; the lock buckle 64 includes a bottom box, an upper cover and a locking nut, the left and right ends of the bottom box are respectively provided with an entrance and an exit, a rope clamping cavity for accommodating the wire ropes and the binding rope 63 is formed in the bottom box, a screw rod is also provided in the bottom box, the upper cover can be movably installed on the screw rod up and down, the upper end of the screw rod extends out of the upper cover and is connected to the locking nut, and the upper cover is pressed downward to squeeze the rope clamping cavity by screwing the locking nut, so that the wire ropes and the binding rope 63 in the rope clamping cavity are pressed and locked, thereby better fixing the explosion-proof net. Each of the wire ropes is composed of a stretchable rope core and a layer of stainless steel wire rope woven outside the rope core, and the stainless steel wire rope is stainless steel or stainless steel. The thickness of the explosion-proof net 6 is 28-32mm, which can support the maximum explosion expansion force of the current cable.

[0025] Furthermore, a temperature sensor 7 may be provided on the outer surface of the copper sleeve 2 to monitor the working temperature of the copper sleeve 2 (especially the joint between the first cable core 11 and the second cable core 12) in real time to ensure the safety of the cable. The alarm system may be connected and an alarm may be sounded if the safe temperature is exceeded to achieve the purpose of fire prevention.

[0026] The above is only a preferred embodiment of the present utility model, and it cannot be used to limit the scope of the implementation of the present utility model. That is, all simple equivalent changes and modifications made according to the scope of the patent application of the present utility model and the content of the utility model description are still within the scope of the present utility model patent.

Claims

1. A composite cable joint, comprising a copper sleeve, an insulating layer, a waterproof layer, a fireproof and explosion-proof bag and an explosion-proof net, wherein the copper sleeve is composed of a first sleeve body and a second sleeve body that are separated and matched with each other, wherein the first sleeve body and the second sleeve body clamp two first cable cores and a second cable core to be connected, so that the inner walls of the first sleeve body and the second sleeve body are tightly fitted with the outer walls of the first cable core and the second cable core; the insulating layer wraps around the outside of the copper sleeve, the first cable core and the second cable core, the waterproof layer is wrapped around the outside of the insulating layer, the fireproof and explosion-proof bag is wrapped around the outside of the waterproof layer, and the explosion-proof net is tied to the fireproof and explosion-proof bag, characterized in that: The copper sleeve is respectively provided with a tightening hoop groove at the position where the first cable core and the second cable core are connected, and a tightening hoop ring is provided on the tightening hoop groove.

2. A composite cable joint according to claim 1, characterized in that: The inner walls of the first and second sleeves of the copper sleeve are provided with at least two rows of frosted surfaces respectively contacting the surfaces of the first cable core and the second cable core.

3. A composite cable joint according to claim 1, characterized in that: The wall thickness of the copper sleeve is preferably 0.8-2.5 mm.

4. A composite cable joint according to claim 3, characterized in that: The depth of the tightening groove is 0.3-0.5 mm, and the width is 5-15 mm.

5. A composite cable joint according to claim 4, characterized in that: The tight hoop is a copper ring with a thickness of 0.5-1 mm.

6. A composite cable joint according to claim 1, characterized in that: The first sleeve body, the second sleeve body, and the first cable core and the second cable core are fixed by welding.

7. A composite cable joint according to claim 1, characterized in that: The waterproof layer is formed by wrapping waterproof adhesive tape or waterproof plastic cloth, and its thickness is 0.2-2mm.

8. A composite cable joint according to claim 1, characterized in that: The fireproof and explosion-proof bag is made of a flexible fireproof material, is provided with an explosion-proof cavity for accommodating the copper sleeve and the insulating layer, and is provided with a plurality of folds.

9. A composite cable joint according to claim 1, characterized in that: Preferably, the explosion-proof net includes a plurality of wire ropes, a plurality of hoops and binding ropes, the wire ropes are arranged in parallel, all the hoops are arranged in an array with staggered intervals, two adjacent wire ropes pass through the hoops, and when the wire ropes are stretched laterally, a mesh structure with a certain elastic contraction can be formed to achieve the purpose of explosion-proof buffering, the binding ropes are interspersed on the wire ropes, and the explosion-proof net is tied to the fire and explosion-proof bag.

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