CN208093772U - A waterproof cable fusion joint - Google Patents

Abstract

The utility model relates to the field of cable connection, a waterproof cable welded joint is disclosed, including two cables, two cables are by the interior semiconductor core that sets gradually from inside to outside, interior semiconductor shielding layer, insulating layer and outer shielding layer are constituteed, the naked exposed section fusion welding of two interior semiconductor core is in the same place, conductor water blocking layer winding is wrapped up on exposed section, super smooth copper foil layer wraps up on conductor water blocking layer, interior semiconductor shielding connecting layer fusion wraps up on super smooth copper foil layer and the fusion is connected on the interior semiconductor shielding layer of two cables, insulating connecting layer fusion wraps up on interior semiconductor shielding connecting layer and fusion is connected on the insulating layer of two cables, outer shielding connecting layer fusion wraps up on insulating connecting layer and fusion is connected on the outer shielding layer of two cables, super smooth shielding waterproof layer fusion wraps up on outer shielding connecting layer. The utility model discloses waterproof cable butt fusion connects firm in connection, water-proof effects is good, and the cable operation is reliable, and the cable body punctures the trouble very few emergence.

Description

A waterproof cable fusion joint

technical field

The utility model relates to the field of cable connection, in particular to a waterproof cable welding joint.

Background technique

With the continuous development of social industry, the demand for power is also increasing. A large number of power cables will be used in the power transmission process. Among them, power cables are used in the backbone lines of the power system to transmit and distribute high power. Cable products for electric energy, including power cables of various voltage levels and insulation levels of 10-110kV and above.

Although the intermediate joint is the most fault-prone part of the cable line, it is unavoidable to use it in the power system. Generally, the length of a distribution network cable is about 600 meters. Basically, a cable intermediate joint is used every time the cable line exceeds 600 meters. It can be seen that the use of cable intermediate joints is quite large, which just increases the safety hazard of cable line operation. And along with the continuous advancement of the urbanization process, every city constantly has high-voltage overhead lines changed to cable lines, and there will be more and more cable intermediate joints in the cable shaft (trench) in the future.

However, the existing intermediate joints are prone to failure, mainly due to the following two factors:

(1) Because the main insulation of the cable and the stress cone of the joint are two kinds of media, there is an overlapping interface in the middle, and its insulation performance is maintained by the stress cone (made of ethylene-propylene rubber or silicone rubber) to maintain the pressure of the interface. During the operation of the cable, due to the change of the flowing current, there is a process of thermal expansion and cold contraction, and the main insulation of the cable and the stress cone of the joint are two kinds of media, and the expansion coefficients are different. Gradually generate gaps, and then gradually generate partial discharge until breakdown;

(2) It is susceptible to moisture. The existing intermediate joint mainly relies on the stress cone to disperse the electric field. The main insulation of the cable and the stress cone are two different media, and there is an overlapping interface between them. Especially in southern China, due to the relatively high groundwater level, Cables are often soaked in water for a long time, and can only rely on waterproof tape for waterproofing. Over time, the waterproof performance of waterproof tape will gradually decrease. At this time, all-pervasive moisture will enter the interface between the main insulation of the cable and the stress cone, which will cause cable joint failure;

(3) Conductors are connected to traditional accessories by crimping connection structure, the connection is not firm, easy to break, and the conductivity of the connection is low, the electric field loss is large, the power loss is large, the connection is heated and discharged, which seriously affects the current carrying capacity of the power cable;

(4) The moisture of the cable will quickly enter the cable conductor from the damage point when the accessories are broken down or damaged by external force, and water tree discharge will easily occur during operation, which will affect the operating life of the entire cable body.

Utility model content

The purpose of this utility model is to provide a waterproof cable welding joint in view of the deficiencies of the above-mentioned technologies, which does not have the problems of aging of the stress cone and discharge breakdown caused by water ingress in the interface. The cable runs reliably and the breakdown of the cable body rarely occurs. failure, and the connection is firm, the conductivity of the connection is high, the power loss is small, the on-site construction is simple and fast, and the structure of the cable body can be completely restored, reaching the factory production level.

In order to achieve the above purpose, the waterproof cable fusion joint designed by the utility model includes a first cable, a second cable, a conductor water-blocking layer, an ultra-smooth copper foil layer, an inner semiconducting shielding connection layer, an insulating connection layer, and an outer shielding connection layer. layer and an ultra-smooth shielding and waterproof layer, the first cable is composed of the first inner semiconducting core, the first inner semiconducting shielding layer, the first insulating layer and the first outer shielding layer arranged sequentially from the inside to the outside, the first The second cable is composed of a second inner semiconducting core, a second inner semiconducting shielding layer, a second insulating layer and a second outer shielding layer arranged sequentially from inside to outside; A first exposed section outside the inner semiconducting shielding layer, the second inner semiconducting core has a second exposed section exposed outside the second inner semiconducting shielding layer, the end of the first exposed section is fused Welded on the end of the second exposed section; the conductor water-blocking layer is wound and wrapped on the first exposed section and the second exposed section, and the ultra-smooth copper foil layer is wrapped on the conductor water-blocking layer layer; the inner semiconductive shield connection layer is melt-wrapped on the ultra-smooth copper foil layer, and one end of the inner semiconductive shield connection layer is melt-connected to the first inner semiconductive shield layer, the The other end of the inner semiconductive shield connection layer is fusion-connected to the second inner semiconductive shield layer; the insulating connection layer is melt-wrapped on the inner semiconductive shield connection layer, and one end of the insulating connection layer is fused connected to the first insulating layer, the other end of the insulating connection layer is fusion-bonded to the second insulating layer; the outer shielding connection layer is melt-wrapped on the insulating connection layer, and the outer shielding One end of the connecting layer is fusion-connected to the first outer shielding layer, and the other end of the outer shielding connection layer is fusion-connected to the second outer shielding layer; the ultra-smooth shielding waterproof layer is melt-wrapped on the outer shielding layer on the shield connection layer.

Preferably, the sum of the lengths of the first exposed section and the second exposed section, the length of the conductor water blocking layer, the length of the ultra-smooth copper foil layer, and the length of the inner semiconducting shield connection layer , the length of the insulating connecting layer, the length of the outer shielding connecting layer and the length of the ultra-smooth shielding and waterproof layer increase sequentially.

Preferably, the first inner semiconducting core and the second inner semiconducting core are fusion-welded as one concentric circular structure, the first inner semiconducting core, the second inner semiconducting core, the conductor water-blocking layer, the ultra-smooth The copper foil layer, the inner semiconductive shield connection layer, the insulation connection layer, the outer shield connection layer and the ultra-smooth shield waterproof layer have a coaxial core wire structure.

Preferably, the conductor water blocking layer has a thickness of 1-4 mm.

Preferably, the thickness of the ultra-smooth copper foil layer is 0.1-0.5 mm.

Preferably, the thickness of the inner semiconductive shield connection layer is 1-2 mm.

Preferably, the insulating connection layer has a thickness of 5-28 mm.

Preferably, the outer shield connection layer has a thickness of 0.5-2 mm.

Preferably, the ultra-smooth shielding waterproof layer has a thickness of 1-5 mm.

Compared with the prior art, the utility model has the following advantages:

1. By melting and welding the end of the first exposed section to the end of the second exposed section, the overall fusion-welded inner semiconductor is as firmly connected as the inner semiconductor of the cable when it leaves the factory, and has strong corrosion resistance and integrity and is not easy to be damaged , The resistance value of the hot-melt joint is small, the electric field loss is small, the power loss is small, and the current carrying capacity is high;

2. By wrapping the conductor water-blocking layer on the first exposed section and the second exposed section, the welded core welding point is a solid entity without gaps, so that there is no flowing water in the core, and the water-blocking material meets The moisture or moisture will swell, and then generate a certain pressure to prevent the moisture from flowing or penetrating into the cable core at the other end, which protects the cable at the other end well, thereby reducing losses and extending the service life of the cable;

3. By wrapping the ultra-smooth copper foil layer on the water-blocking layer of the conductor, it plays the role of a smooth wire core, shielding the unevenness of the original cable conductor, and avoiding the unevenness between the inner semi-conductive shield connection layer and the insulation layer connection , to avoid the generation of water chestnuts or sharp points that cause internal discharge and affect the operating life;

4. By melting and wrapping the ultra-smooth shielding and waterproof layer on the outer shielding connection layer, a layer of smooth shielding material is fused on the outer shielding connection layer to play a waterproof role. The smooth surface does not hide moisture and does not absorb moisture, avoiding The formation of water branches and the aging discharge of the outer shielding layer, thereby prolonging the operating life of the cable;

5. Melt-wrap the insulating connection layer on the inner semi-conductive shielding layer by melting and wrapping the inner semi-conductive shielding connection layer on the ultra-smooth copper foil layer and fusion-connecting the first inner semi-conductive shielding layer and the second inner semi-conductive shielding layer. The shielding connection layer is melted and connected to the first insulating layer and the second insulating layer, and the outer shielding connecting layer is melt-wrapped on the insulating connecting layer and melted and connected to the first outer shielding layer and the second outer shielding layer, and the connection is firm , The connection has high conductivity, low power loss, simple and quick on-site construction, and can completely restore the cable body structure to reach the factory production level.

Description of drawings

Fig. 1 is a structural schematic diagram of a waterproof cable fusion joint of the present invention.

The components in the figure are numbered as follows:

The first cable 1, the second cable 2, the conductor water blocking layer 3, the ultra-smooth copper foil layer 4, the inner semiconducting shield connection layer 5, the insulation connection layer 6, the outer shield connection layer 7, the ultra-smooth shield waterproof layer 8, the second An inner semiconducting shielding layer 11, a first insulating layer 12, a first outer shielding layer 13, a first exposed section 14, a second inner semiconducting shielding layer 21, a second insulating layer 22, a second outer shielding layer 23, a second Bare paragraph 24.

Detailed ways

Below in conjunction with accompanying drawing and specific embodiment the utility model is described in further detail.

As shown in Figure 1, the utility model is a waterproof cable welding joint, including a first cable 1, a second cable 2, a conductor water blocking layer 3, an ultra-smooth copper foil layer 4, an inner semiconducting shielding connection layer 5, an insulating connection layer Layer 6, outer shielding connection layer 7 and ultra-smooth shielding waterproof layer 8, the first cable 1 is composed of the first inner semiconducting core, the first inner semiconducting shielding layer 11, the first insulating layer 12 and the second An outer shielding layer 13 is composed, and the second cable 2 is composed of a second inner semiconducting core, a second inner semiconducting shielding layer 21, a second insulating layer 22 and a second outer shielding layer 23 arranged sequentially from inside to outside; the first The inner semiconducting core has a first exposed section 14 exposed outside the first inner semiconducting shielding layer 11, the second inner semiconducting core has a second exposed section 24 exposed outside the second inner semiconducting shielding layer 21, the first The end of the exposed section 14 is fusion-welded to the end of the second exposed section 24, and the inner semiconductor is connected firmly through the overall fusion welding as the inner semiconductor of the cable when it leaves the factory. It has strong corrosion resistance and integrity and is not easy to be damaged. The resistance value of the joint is small, the electric field loss is small, the power loss is small, and the current carrying capacity is high; the conductor water blocking layer 3 is wound and wrapped on the first exposed section 14 and the second exposed section 24, so that the welded core welding point is a solid Entity, no gaps, so that there is no flowing water in the core, the water-blocking material expands when it encounters water or moisture, and then generates a certain pressure to prevent water from flowing or penetrating into the cable core at the other end, which protects the other end well cable, thereby reducing losses and prolonging the service life of the cable. The ultra-smooth copper foil layer 4 is wrapped on the conductor water-blocking layer 3, which plays the role of a smooth wire core, shields the original cable conductor from unevenness, and avoids the inner semi-conductive shielding layer The unevenness between the insulation layer and the insulating layer avoids the generation of water chestnuts or sharp points that cause internal discharge and affect the operating life; the inner semiconductive shield connection layer 5 is melt-wrapped on the ultra-smooth copper foil layer 4, and one end of the inner semiconductive shield connection layer 5 It is melted and connected to the first inner semiconducting shielding layer 11, and the other end of the inner semiconducting shielding connection layer 5 is melted and connected to the second inner semiconducting shielding layer 21 to realize the connection between the first exposed section 14 and the second exposed section 24. shielding protection, and connect the first inner semiconducting shielding layer 11 and the second inner semiconducting shielding layer 21; the insulating connecting layer 6 is melt-wrapped on the inner semiconducting shielding connecting layer 5, and one end of the insulating connecting layer 6 is fusion-connected to the second inner semiconducting shielding layer 5 On the first insulating layer 12, the other end of the insulating connecting layer 6 is fused and connected to the second insulating layer 22 to realize the function of insulating protection and connect the first insulating layer 12 and the second insulating layer 22; the outer shielding connecting layer 7 is melt-wrapped On the insulating connecting layer 6, and one end of the outer shielding connecting layer 7 is fused and connected to the first outer shielding layer 13, and the other end of the outer shielding connecting layer 7 is fused and connected to the second outer shielding layer 23 to realize the function of shielding protection , and connect the first outer shielding layer 13 and the second outer shielding layer 23; the ultra-smooth shielding and waterproof layer 8 is melt-wrapped on the outer shielding connection layer 7, and then a layer of smooth shielding material is fused on the outer shielding connection layer 7 for waterproofing The smooth surface does not hide moisture, does not absorb moisture, and avoids the formation of water branches and the aging discharge of the outer shield connection layer 7 , thereby prolonging the operating life of the cable.

In addition, the sum of the lengths of the first exposed section 14 and the second exposed section 24, the length of the conductor water blocking layer 3, the length of the ultra-smooth copper foil layer 4, the length of the inner semiconducting shielding connection layer 5, the length of the insulating connection layer 6 length, the length of the outer shielding connection layer 7 and the length of the ultra-smooth shielding waterproof layer 8 increase sequentially, and at the same time, the first inner half wire core and the second inner half wire core are fusion-welded as one concentric circle structure, the first inner half wire core Conductor core, second inner semi-conductor core, conductor water-blocking layer 3, ultra-smooth copper foil layer 4, inner semi-conductive shielding connection layer 5, insulating connection layer 6, outer shielding connection layer 7 and super-smooth shielding waterproof layer 8 are the same The axis line structure forms a stronger ladder connection structure and a more reasonable structure.

In this embodiment, the thickness of the conductor water-blocking layer 3 is 1 mm, the thickness of the ultra-smooth copper foil layer 4 is 0.1 mm, the thickness of the inner semiconducting shield connection layer 5 is 1 mm, and the thickness of the insulating connection layer 6 is 5 mm. , the thickness of the outer shielding connection layer 7 is 0.5 mm, and the thickness of the ultra-smooth shielding waterproof layer 8 is 1 mm. In other embodiments, the thickness of the conductor water blocking layer 3 is 4 millimeters, the thickness of the ultra-smooth copper foil layer 4 is 0.5 millimeters, the thickness of the inner semiconducting shield connection layer 5 is 2 millimeters, and the thickness of the insulating connection layer 6 is 28 mm. mm, the thickness of the outer shield connection layer 7 is 2 mm, and the thickness of the ultra-smooth shielding waterproof layer 8 is 5 mm.

In this embodiment, when the first exposed section 14 and the second exposed section 24 are fused and welded, a graphite mold is added to the ends of the inner conductors at both ends, and molten brazing powder is put in to produce a chemical reaction to form high-temperature copper water, which passes through the graphite mold. The groove-shaped conductor core in the mold is fused and welded into a concentric structure. The inner conductor is welded by integral melting to make it as firm as the inner conductor when the cable leaves the factory. Since the melting speed of the exothermic welding point is weaker than that of the general electrical conductor, the corrosion resistance and integrity are strong and not easy to be damaged. The resistance of the joint at the hot melt point The value is small, the electric field loss is small, the power loss is small, and the carrying capacity is high.

A waterproof cable welding joint of the utility model melts and welds the end of the first exposed section 14 to the end of the second exposed section 24, and the overall melting and welding of the inner semiconductor is as firm as the inner semiconductor of the cable when it leaves the factory. Corrosion and integrity are strong and not easy to be damaged, the resistance value of the hot-melt joint is small, the electric field loss is small, the power loss is small, and the current carrying capacity is high; by wrapping the conductor water-blocking layer 3 on the first exposed section 14 and the second exposed section 24, the welding point of the welded wire core is a solid entity without gaps, so that there is no flowing water in the wire core, and the water-blocking material expands when it encounters water or moisture, thereby generating a certain pressure to prevent water from flowing or penetrating to another The cable core at one end well protects the cable at the other end, thereby reducing losses and prolonging the service life of the cable; by wrapping the ultra-smooth copper foil layer 4 on the conductor water-blocking layer 3, it plays the role of a smooth core , to shield the defect of the original cable conductor being uneven, to avoid the unevenness between the inner semiconducting shielding connection layer 5 and the insulating connection layer 6, and to avoid the occurrence of water chestnut or sharp points that cause internal discharge and affect the operating life; by super-smooth shielding waterproof layer 8 It is melt-wrapped on the outer shielding connection layer 7, and a layer of smooth shielding material is fused on the outer shielding connection layer 7 to play a waterproof role. The smooth surface does not hide moisture or absorb moisture, and avoids the formation of water branches and the outer shielding Layer aging discharge, thereby prolonging the operating life of the cable; by melting and wrapping the inner semiconducting shielding connection layer 5 on the ultra-smooth copper foil layer 4 and melting and connecting the first inner semiconducting shielding layer 11 and the second inner semiconducting shielding layer 21, the insulating connection layer 6 is melt-wrapped on the inner semiconducting shielding connection layer 5 and is melt-connected to the first insulating layer 12 and the second insulating layer 22, and the outer shielding connecting layer 7 is melt-wrapped on the insulating connecting layer 6 Moreover, it is melted and connected to the first outer shielding layer 13 and the second outer shielding layer 23, the connection is firm, the conductivity of the connection is high, the power loss is small, the on-site construction is simple and quick, and the structure of the cable body can be completely restored to reach the factory production level.

Claims (9)

1. A waterproof cable fusion joint, comprising a first cable (1), a second cable (2), a conductor water-blocking layer (3), an ultra-smooth copper foil layer (4), and an inner semiconductive shield connection layer (5) , an insulating connection layer (6), an outer shielding connection layer (7) and an ultra-smooth shielding and waterproof layer (8), characterized in that: the first cable (1) is composed of first inner semiconducting cores arranged sequentially from the inside to the outside , the first inner semiconducting shielding layer (11), the first insulating layer (12) and the first outer shielding layer (13), the second cable (2) is composed of the second inner semiconducting wire arranged in sequence from inside to outside core, a second inner semiconductive shielding layer (21), a second insulating layer (22) and a second outer shielding layer (23); The first exposed section (14) outside the layer (11), the second inner semiconducting core has a second exposed section (24) exposed outside the second inner semiconducting shielding layer (21), the first The end of an exposed section (14) is welded to the end of the second exposed section (24); the conductor water blocking layer (3) is wrapped around the first exposed section (14) and the second exposed section (24). On the two exposed sections (24), the ultra-smooth copper foil layer (4) is wrapped on the conductor water-blocking layer (3); the inner semi-conductive shield connection layer (5) is fused and wrapped on the ultra-smooth copper Foil layer (4), and one end of the inner semiconductive shield connection layer (5) is fusion-bonded to the first inner semiconductive shield layer (11), and the inner semiconductive shield connection layer (5) The other end is melt-connected on the second inner semiconducting shielding layer (21); the insulating connection layer (6) is melt-wrapped on the inner semiconducting shielding connecting layer (5), and the insulating connecting layer ( 6) one end is fusion-connected to the first insulation layer (12), and the other end of the insulation connection layer (6) is fusion-connected to the second insulation layer (22); the outer shield connection layer ( 7) melting and wrapping on the insulating connecting layer (6), and one end of the outer shielding connecting layer (7) being melted and connected to the first outer shielding layer (13), the outer shielding connecting layer (7) ) is melted and connected to the second outer shielding layer (23); the ultra-smooth shielding waterproof layer (8) is melted and wrapped on the outer shielding connection layer (7). 2. The waterproof cable fusion joint according to claim 1, characterized in that: the sum of the lengths of the first exposed section (14) and the second exposed section (24), the conductor water-blocking layer (3) The length of the ultra-smooth copper foil layer (4), the length of the inner semiconducting shielding connection layer (5), the length of the insulating connection layer (6), the outer shielding connection layer (7) The length and the length of the ultra-smooth shielding waterproof layer (8) increase sequentially. 3. The waterproof cable welding joint according to claim 1, characterized in that: the first inner half wire core and the second inner half wire core are fusion-welded as one concentric circle structure, the first inner half wire core, The second inner semi-conductor core, the conductor water-blocking layer (3), the ultra-smooth copper foil layer (4), the inner semi-conductive shield connection layer (5), the insulation connection layer (6), the outer shield connection layer (7) and the ultra-smooth The smooth shielding waterproof layer (8) has a coaxial core line structure. 4. The waterproof cable welding joint according to claim 1, characterized in that: the conductor water-blocking layer (3) has a thickness of 1-4 mm. 5. The waterproof cable welding joint according to claim 1, characterized in that: the thickness of the ultra-smooth copper foil layer (4) is 0.1-0.5 mm. 6. The waterproof cable welding joint according to claim 1, characterized in that: the thickness of the inner semi-conductive shield connection layer (5) is 1-2 mm. 7. The waterproof cable welding joint according to claim 1, characterized in that: the thickness of the insulating connection layer (6) is 5-28 mm. 8. The waterproof cable welding joint according to claim 1, characterized in that: the outer shield connection layer (7) has a thickness of 0.5-2 mm. 9. The waterproof cable welding joint according to claim 1, characterized in that: the thickness of the ultra-smooth shielding waterproof layer (8) is 1-5 mm.