CN104332236B - A kind of cable - Google Patents

Abstract

The invention provides a cable, which includes a conductive core, an insulating layer (5), a shielding layer and a protective layer (7), and the shielding layer is arranged inside and outside the insulating layer; The conductive inner core (1) has radially arranged fins (2) and a heat dissipation layer (3) filled between the fins (2), and the heat dissipation layer (3) is a low melting point alloy layer. The cable has a large current-carrying capacity, a strong heat dissipation capacity, saves raw materials, has a slow aging speed, and prolongs the service life of the cable.

Description

a cable

technical field

The invention relates to a power transmission device, in particular to a cable.

Background technique

A superconducting material is a material whose electrical resistance suddenly drops to zero below a certain temperature.

The zero-resistance property of superconducting materials can be used to manufacture superconducting power devices such as superconducting cables, superconducting magnets, and superconducting transformers, which can minimize losses.

Superconducting power devices are mainly suitable for large current transmission. The cables used to connect superconducting power devices and power transformation devices are usually relatively large in diameter and relatively heavy. Due to the heating effect of the current, when the load current passes through the conventional cable, the heating phenomenon is more obvious. When transmitting larger currents, generally multiple conventional cables are used in parallel to reduce the heat dissipation burden of a single cable. Even so, the heat dissipation effect of the cable is still not good, and the aging speed is still relatively fast.

Contents of the invention

In order to overcome the above-mentioned defects in the prior art, the present invention provides an improved cable with large current-carrying capacity, strong heat dissipation, saving raw materials, slow aging speed and prolonging the service life of the cable.

For realizing above-mentioned purpose of the invention, the technical scheme that the present invention takes is:

A cable includes a conductive core, an insulating layer (5), a shielding layer, and a protective layer (7), and the insulating layer is provided with a shielding layer inside and outside; the conductive core includes a conductive inner core (1) and a The fins (2) arranged toward the fins (2) and the heat dissipation layer (3) filled between the fins (2).

The fins (2) are made of one of gold, silver, copper, aluminum or aluminum alloy.

The conductive inner core (1) is made of one or more materials among gold, silver, copper, aluminum or aluminum alloy.

Further, the conductive inner core (1) and the fins (2) are made of the same material. Good heat dissipation.

Further, the conductive inner core (1) is an alloy, by weight percentage, the alloy: 0.1% silicon, 0.3%-0.8% iron, 0.15%-0.3% copper, 0.05% magnesium, 0.05% zinc, 0.001% boron ~0.004%, aluminum is the balance.

Further, the conductive inner core (1) is a single metal wire, the fins (2) and the metal wire are integrally formed, and the metal is formed by a mold, and the diameter of the metal wire is 5-100mm.

The fins (2) dissipate heat for the conductor layer through heat conduction, and provide support for the low melting point alloy heat dissipation layer.

Further, the conductive inner core (1) is metal wires arranged in parallel or twisted metal wires.

Further, the twisted metal wires are twisted independently of a single metal wire or twisted after pre-twisted strands of a plurality of metal wires.

Further, for twisted metal wires, the diameter of a single metal wire is 1-5 mm, and the diameter of multiple metal wires is 5-100 mm after twisting; when a single metal wire is twisted independently, the stranding pitch ratio is 10-60 times .

Further, the conductive inner core (1) and the fins (2) are connected by welding.

Further, the heat dissipation layer (3) is a low melting point alloy layer.

Further, the insulating layer (5) is a cross-linked polyethylene layer, and the shielding layer I (4) arranged inside the insulating layer (5) is a polyvinyl chloride layer, which shields electromagnetic fields.

Further, the shielding layer II (6) provided outside the insulating layer (5) is a low melting point alloy layer.

Further, the low melting point alloy is a gallium alloy.

The selected low-melting point alloy has high thermal conductivity, high density and good stability, and is not prone to chemical changes after phase transition.

The low-melting-point alloy is used as a power transmission medium, and the low-melting-point alloy absorbs heat during the phase transformation process. The conductive layer of the cable generates heat. When the temperature reaches the melting point of the low-melting point alloy, the low-melting point alloy will change from solid to liquid, which reduces the thermal resistance between the conductive layer and the atmospheric environment, and improves the temperature uniformity of the entire power transmission cable. .

The gallium alloy is Ga80In20 or Ga62In25Sn13.

Another object of the present invention is to provide a method for preparing cables, comprising the steps of:

1) Wire drawing: Heat treatment of the metal drawn by the wire drawing machine; copper and aluminum monofilaments are heated to a certain temperature to improve the toughness of the monofilaments and reduce the strength of the monofilaments by recrystallization, so as to meet the requirements of wires and cables. Conductive core requirements. The key to the annealing process is to prevent the oxidation of the copper wire;

2) Stranding: Hydraulically suppress the metal wires twisted according to the pitch diameter;

3) Welding fins (2);

4) Place the formed heat dissipation layer between the fins and press it tightly;

5) Coating shielding layer I;

Extrude the shielding layer Ⅰ, and seal the ends of the cable;

6) Coated insulation layer (5); extruded solid insulation layer or tightly wound insulation layer;

7) Put the molded shielding layer II on the outside of the insulating layer (5);

8) Cover the protective layer (7), extrude the plastic protective layer with an extruder, and form a cable.

The two ends of the conductive inner core are ring-shaped connection structures; the shielding layer I, insulating layer and shielding layer II are sealed at the connection between the linear part of the conductive inner core and the ring structure to prevent the low-melting point alloy from flowing out after phase change.

Connect the two ends of the cable to the substation device and the superconducting power device respectively.

Owing to adopting above-mentioned technical scheme, compared with prior art, the beneficial effect of the present invention comprises:

1. In the cable of the present invention, fins and a heat dissipation layer are added, and the heat dissipation layer is made of a low-melting point metal, which absorbs heat by phase transition of the low-melting point metal, and has a strong heat dissipation capability;

2. The rated current-carrying capacity of the cable in the present invention is improved, and the current-carrying capacity is large;

3. The cable in the present invention saves raw materials and reduces costs;

4. The aging speed of the cable in the present invention is slow, prolonging the service life of the cable;

5. The cable in the present invention is energy-saving and environmentally friendly;

6. The cable structure of the present invention is simple, easy to manufacture, and low in manufacturing cost;

7. The low melting point alloy in the cable of the present invention will change from solid to liquid when the temperature reaches the melting point, which reduces the thermal resistance between the conductor layer and the atmospheric environment and improves the temperature uniformity of the cable.

Description of drawings

Figure 1 is a cross-sectional view of the cable;

Figure 2 is a sectional view of the cable;

1 conductive inner core; 2 fins; 3 heat dissipation layer; 4 shielding layer Ⅰ; 5 insulating layer; 6 shielding layer Ⅱ; 7 protective layer.

detailed description

Below in conjunction with example the present invention is described in detail.

Example 1:

As shown in Figure 1, a cable of the present invention includes

A cable includes a conductive core, an insulating layer (5), a shielding layer, and a protective layer (7), and the insulating layer is provided with a shielding layer inside and outside; the conductive core includes a conductive inner core (1) and a The fins (2) and the heat dissipation layer (3) filled between the fins (2) are arranged on the top.

The conductive inner core (1) is a single metal wire, the fins (2) and the metal wire are integrally formed, and the metal is formed by a mold, and the diameter of the metal wire is 100 mm.

Conductive inner core (1) and fins (2) are aluminum alloy, aluminum alloy by weight percentage: silicon 0.1%, iron 0.3%-0.8%, copper 0.15%-0.3%, magnesium 0.05%, zinc 0.05%, boron 0.001%～0.004%, aluminum is the balance. Good heat dissipation.

The fins (2) dissipate heat for the conductor layer through heat conduction, and provide support for the low melting point alloy heat dissipation layer.

The heat dissipation layer (3) is a Ga80In20 layer. The insulating layer (5) is a cross-linked polyethylene layer, and the shielding layer I (4) provided in the insulating layer (5) is a polyvinyl chloride layer for shielding electromagnetic fields. The shielding layer II (6) arranged outside the insulating layer (5) is a Ga80In20 layer.

Another object of the present invention is to provide a method for preparing cables, comprising the steps of:

1) The fins (2) and the metal wire are integrally formed, and the metal is formed by a mold;

2) Place the heat dissipation layer formed by the mold between the fins and press it tightly;

3) Coating shielding layer I;

Extrude the shielding layer Ⅰ, and seal the ends of the cable;

4) Coated insulating layer (5); extruded solid insulating layer;

5) Put the molded shielding layer II on the outside of the insulating layer (5);

6) Cover the protective layer (7), extrude the plastic protective layer with an extruder, and form a cable.

The two ends of the conductive inner core are ring-shaped connection structures; the shielding layer I, insulating layer and shielding layer II are sealed at the connection between the linear part of the conductive inner core and the ring structure to prevent the low-melting point alloy from flowing out after phase change.

Connect the two ends of the cable to the substation device and the superconducting power device respectively.

Example 2:

As shown in Figure 1, a cable of the present invention includes

A cable includes a conductive core, an insulating layer (5), a shielding layer, and a protective layer (7), and the insulating layer is provided with a shielding layer inside and outside; the conductive core includes a conductive inner core (1) and a The fins (2) and the heat dissipation layer (3) filled between the fins (2) are arranged on the top.

The conductive inner core (1) is metal wires arranged in parallel, the diameter of a single metal wire is 5 mm, and the diameter of 10 metal wires is 5-10050 mm; the conductive inner core (1) and the fins (2) are connected by welding. The conductive inner core (1) and the fins (2) are made of the same material, both are copper, and have good heat dissipation performance.

The fins (2) dissipate heat for the conductor layer through heat conduction, and provide support for the low melting point alloy heat dissipation layer.

The heat dissipation layer (3) is a Ga62In25Sn13 layer. The insulating layer (5) is a cross-linked polyethylene layer, and the shielding layer I (4) provided in the insulating layer (5) is a polyvinyl chloride layer for shielding electromagnetic fields. The shielding layer II (6) provided outside the insulating layer (5) is a Ga62In25Sn13 layer.

Another object of the present invention is to provide a method for preparing cables, comprising the steps of:

1) Wire drawing: Heat treatment after drawing the metal wire with a wire drawing machine;

2) Twisting system: multiple metal wires are arranged in parallel and then hydraulically pressed;

3) Welding fins (2);

4) Place the heat dissipation layer formed by the mold between the fins and press it tightly;

5) Coating shielding layer I;

Extrude the shielding layer Ⅰ, and seal the ends of the cable;

6) Coating insulation layer (5); tightly wound insulation layer;

7) Put the molded shielding layer II on the outside of the insulating layer (5);

8) Cover the protective layer (7), extrude the plastic protective layer with an extruder, and form a cable.

The two ends of the conductive inner core are ring-shaped connection structures; the shielding layer I, insulating layer and shielding layer II are sealed at the connection between the linear part of the conductive inner core and the ring structure to prevent the low-melting point alloy from flowing out after phase change.

Connect the two ends of the cable to the substation device and the superconducting power device respectively.

Example 3:

As shown in Figure 1, a cable of the present invention

A cable includes a conductive core, an insulating layer (5), a shielding layer, and a protective layer (7), and the insulating layer is provided with a shielding layer inside and outside; the conductive core includes a conductive inner core (1) and a The fins (2) and the heat dissipation layer (3) filled between the fins (2) are arranged on the top.

The conductive inner core (1) is a metal wire twisted with a single metal wire. The diameter of a single metal wire is 1mm, and the diameter of a plurality of metal wires is 100mm; when a single metal wire is twisted independently, the stranding pitch ratio is 60 times.

The conductive inner core (1) and the fins (2) are connected by welding.

The fins (2) dissipate heat for the conductor layer through heat conduction, and provide support for the low melting point alloy heat dissipation layer.

The conductive inner core (1) is made of the same material as the fins (2), which is aluminum, and has good heat dissipation performance.

The heat dissipation layer (3) is a Ga80In20 layer. The insulating layer (5) is a cross-linked polyethylene layer, and the shielding layer I (4) provided in the insulating layer (5) is a polyvinyl chloride layer for shielding electromagnetic fields. The shielding layer II (6) arranged outside the insulating layer (5) is a Ga80In20 layer.

Another object of the present invention is to provide a method for preparing cables, comprising the steps of:

1) Wire drawing: Heat treatment after drawing the metal wire with a wire drawing machine;

2) Twisting system: multiple metal wires are twisted with a certain pitch diameter and then hydraulically compressed;

3) Welding fins (2);

4) Place the heat dissipation layer formed by the mold between the fins and press it tightly;

5) Coating shielding layer I;

Extrude the shielding layer Ⅰ, and seal the ends of the cable;

6) Coated insulation layer (5); extruded solid insulation layer or tightly wound insulation layer;

7) Put the molded shielding layer II on the outside of the insulating layer (5);

8) Cover the protective layer (7), extrude the plastic protective layer with an extruder, and form a cable.

The two ends of the conductive inner core are ring-shaped connection structures; the shielding layer I, insulating layer and shielding layer II are sealed at the connection between the linear part of the conductive inner core and the ring structure to prevent the low-melting point alloy from flowing out after phase change.

Connect the two ends of the cable to the substation device and the superconducting power device respectively.

Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and not to limit them. Although the present invention has been described in detail with reference to the above embodiments, those of ordinary skill in the art should understand that: the present invention can still be Any modification or equivalent replacement that does not depart from the spirit and scope of the present invention shall be covered by the scope of the claims of the present invention.

Claims (6)

1. a kind of cable, the cable includes conductive core, insulating barrier (5), screen layer and protective layer (7), it is characterised in that：Institute State and screen layer is set respectively inside and outside insulating barrier；The conductive core include conductive core (1) and along the conductive core (1) radially The fin (2) of setting and the heat dissipating layer (3) being filled between the fin (2)；The conductive core (1) is with fin (2) by identical Material is made；

The conductive core (1) is twisted metal wire；The cable preparation method comprises the following steps：

1) bracing wire：The metal drawn to wire drawing machine is heat-treated；

2) hydraulic pressure compacting is carried out to conductive core (1)；

3) fin (2) is welded；

4) between the radiating of shaping being placed on into fin, compress；

5) screen layer is coated；

6) coated insulation layer (5)；

7) formed in mould screen layer is located at insulating barrier (5) outside；

8) protective layer (7), stranding are coated.

A kind of 2. cable as claimed in claim 1, it is characterised in that：The twisted metal wire, single-wire a diameter of 1~ 5mm, a diameter of 5~100mm after more wires process.

A kind of 3. cable as claimed in claim 1, it is characterised in that：The heat dissipating layer (3) is low-melting alloy layer.

A kind of 4. cable as claimed in claim 1, it is characterised in that：The insulating barrier (5) is cross-linked polyethylene layer, described exhausted Screen layer built in edge layer (5) is polyvinyl chloride layer.

A kind of 5. cable as claimed in claim 1, it is characterised in that：The external screen layer of the insulating barrier (5) is low melting point Alloy-layer.

A kind of 6. cable as described in claim 3 or 5, it is characterised in that：The low-melting alloy is gallium alloy.