Aluminum alloy medium-voltage cable

Abstract

The invention discloses an aluminum alloy medium-voltage cable which comprises an internal cable core, the external part of the internal cable core is coated with an aluminum alloy inner layer, the external part of the aluminum alloy inner layer is coated with an aluminum alloy middle layer, and the external part of the aluminum alloy middle layer is correspondingly coated with an aluminum alloy outer layer; the outer portion of the aluminum alloy outer layer is correspondingly wrapped by a wrapping layer, the outer portion of the wrapping layer is correspondingly wrapped by an outer shielding layer, and the outer portion of the outer shielding layer is correspondingly wrapped by an outer sheath. The three layers of aluminum alloy are arranged, the aluminum alloy inner layer and the aluminum alloy outer layer are each of a normal annular layered structure, the aluminum alloy middle layer in the middle is of a wavy structure, and firstly, the three aluminum alloy layers enable the whole cable to have good fireproof and flame-retardant performance; in addition, through the aluminum alloy middle layer with the middle wave-shaped structure, the whole cable has a good ventilation function, and the structural design is ingenious and reasonable.

Description

Technical Field

[0001] The invention relates to an aluminum alloy cable in cable technology, in particular to an aluminum alloy medium-voltage cable. Background Art

[0002] In the prior art, medium voltage cable is a commonly used cable. The voltage range of most medium voltage cables is between 6KV and 33KV. Medium voltage cables are widely used in petrochemical, transportation, wastewater treatment, food processing and other fields. They are very important types of application cables.

[0003] The medium voltage cable in the prior art, for example: "A medium voltage cable with aluminum alloy conductor" disclosed in the publication (announcement) number: CN206471147U; this technical solution has a longer self-bearing capacity, light weight, more economical price, better corrosion resistance (better than aluminum), better bending performance, better creep resistance, greater tensile strength, better elongation and flexibility, and low elasticity compared to pure aluminum. It includes 3 insulating cores and a protective outer layer, and a mineral filling layer is arranged between the 3 insulating cores. It also includes a triangular frame-shaped reinforcement member with a cross section, and the 3 insulating cores are arranged between adjacent frame arms of the triangular frame-shaped reinforcement member. The protective outer layer includes a fire-resistant isolation layer, an aluminum alloy corrugated armor layer, an inner sheath and an outer sheath from the inside to the outside; a plurality of reinforcing ribs are radially arranged on the inner sheath outward, and the reinforcing ribs are not connected to the outer sheath; fillers are also filled between the inner sheath and the outer sheath, and the reinforcing ribs and the inner sheath are wrapped by the fillers.

[0004] For example: "A corrosion-resistant medium-voltage aluminum alloy cable" disclosed in the publication (announcement) number: CN217405153U; including a corrosion-resistant mechanism and a connecting jacket, the corrosion-resistant mechanism is internally plugged with a connecting mechanism, the surface of the connecting mechanism is connected with a packing layer 2, and the connecting jacket is plugged into the outer wall surface of the corrosion-resistant mechanism. In this corrosion-resistant medium-voltage aluminum alloy cable, the corrosion-resistant layer 1 and the corrosion-resistant layer 2 are the outermost corrosion-resistant layers, and at the same time, carbon fiber and polytetrafluoroethylene have strong corrosion resistance, so that the two corrosion layers can initially protect the internal cable core, thereby increasing the service life of the cable core, and the packing layer 1 and the packing layer 2 are composed of ceramic particles, and the smaller ceramic particles can reduce the wear resistance of the cable, and at the same time can enhance the corrosion resistance and insulation effects, and at the same time, the packing layer 1 and the packing layer 2 can protect the safety of the cable core and increase the service life of the device.

[0005] Medium voltage cables in the prior art are usually required to have fire retardant effects, and according to the requirements of the use environment, they also need to have good air permeability and good pressure resistance, etc.; in the above-mentioned technical solutions and existing technical solutions, usually under the premise of having fire retardant effects, their air permeability will be poor; and flame retardant and fireproof cables do not have good pressure resistance.

[0006] Therefore, in order to solve the above problems, it is necessary to develop an aluminum alloy medium voltage cable with a reasonable structure, flame retardancy and good air permeability. Summary of the invention

[0007] The purpose of the present invention is to provide an aluminum alloy medium voltage cable in view of the shortcomings of the prior art; the technical solution is as follows:

[0008] An aluminum alloy medium-voltage cable comprises an inner cable core, the outer portion of the inner cable core is coated with an aluminum alloy inner layer, the outer portion of the aluminum alloy inner layer is coated with an aluminum alloy middle layer, and the outer portion of the aluminum alloy middle layer is correspondingly coated with an aluminum alloy outer layer; the outer portion of the aluminum alloy outer layer is correspondingly coated with a wrapping layer, the outer portion of the wrapping layer is correspondingly coated with an outer shielding layer, and the outer portion of the outer shielding layer is correspondingly coated with an outer sheath;

[0009] The aluminum alloy inner layer and the aluminum alloy outer layer are both arranged as an annular layered structure; and the aluminum alloy middle layer is arranged as an annular wavy structure, and the aluminum alloy middle layer is composed of a continuously arranged wavy inner ring and a wavy outer ring, the wavy inner ring is convex to the outside, and the wavy inner ring is concave to the inside, and the whole constitutes the aluminum alloy middle layer;

[0010] The aluminum alloy inner layer is pressed against the corrugated inner circle of the aluminum alloy middle layer from the inside, and the aluminum alloy outer layer is pressed against the corrugated outer circle of the aluminum alloy middle layer. Through the structural design of the aluminum alloy middle layer, a transparent area is formed between the aluminum alloy inner layer and the aluminum alloy outer layer.

[0011] Furthermore, the internal cable core includes a cable core conductor, an insulating layer coated on the outside of the cable core conductor, an inner shielding layer coated on the outside of the insulating layer, and an inner sheath coated on the outside of the inner shielding layer; and the aluminum alloy inner layer is correspondingly coated on the inner sheath.

[0012] Furthermore, the inner shielding layer and the outer shielding layer are both configured as copper wire mesh braided layers, and the inner sheath and the outer sheath are both configured as fireproof sheaths.

[0013] Furthermore, the wavy outer ring and the wavy inner ring of the aluminum alloy middle layer are both configured as semicircular structures, the wavy outer ring and the wavy inner ring are consistent in size, and after continuous butt connection, an integral aluminum alloy middle layer is formed.

[0014] Furthermore, a support plate adapted to the number and position of the wavy inner rings is also provided at the outer end surface of the aluminum alloy inner layer; the support plate extends into the wavy outer rings accordingly, presses the wavy outer rings accordingly, and presses the aluminum alloy outer layer accordingly.

[0015] Furthermore, a support plate corresponding to the number and position of the wavy outer rings is provided at the inner end of the aluminum alloy outer layer, and the support plate extends into the wavy inner ring, is pressed against the wavy inner ring, and is pressed against the aluminum alloy inner layer.

[0016] Furthermore, ten of the wave inner rings and ten of the wave outer rings are provided, and twenty of the support plates are provided.

[0017] Beneficial effects: The present invention has the following beneficial effects:

[0018] 1) The present invention is provided with three layers of aluminum alloy, the inner layer and the outer layer of the aluminum alloy are both normal annular layered structures, and the middle aluminum alloy middle layer is provided with a wavy structure. Firstly, the three layers of aluminum alloy layers make the whole cable have better fire retardant performance; in addition, the aluminum alloy middle layer with a wavy structure in the middle makes the whole cable have better ventilation function, and the structural design is ingenious and reasonable;

[0019] 2) The specific shape of the aluminum alloy middle layer in the device includes a wave inner ring and a wave outer ring, and the wave outer ring and the wave inner ring are arranged in a staggered and continuous manner to form an integral aluminum alloy middle layer; then the aluminum alloy inner layer is arranged close to the wave inner ring, and the aluminum alloy outer layer is arranged close to the wave outer ring, and the structural design of the aluminum alloy middle layer is very reasonable;

[0020] 3) The present invention also installs support plates on the aluminum alloy inner layer and the aluminum alloy outer layer accordingly. The support plate on the aluminum alloy inner layer corresponds to the position of the wave outer circle, and the support plate on the aluminum alloy outer layer corresponds to the position of the wave inner circle. The inner and outer support plates extend into the corresponding circle bodies and press the aluminum alloy layer accordingly. This arrangement gives a certain supporting force to the middle aluminum alloy middle layer. When subjected to external pressure, it is supported and fixed by the aluminum alloy outer layer, the aluminum alloy inner layer and the corresponding support plates in the middle. While ensuring air permeability, it can effectively increase the compressive resistance of the entire cable. The structural design is very ingenious. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 This is a structural diagram of Embodiment 1 of the present invention;

[0022] Figure 2 for Figure 1 Aluminum alloy middle layer structure diagram;

[0023] Figure 3 This is a structural diagram of Embodiment 2 of the present invention;

[0024] Figure 4 for Figure 3 Installation diagram of aluminum alloy inner layer and aluminum alloy middle layer;

[0025] Figure 5 for Figure 3 The installation diagram of the aluminum alloy middle layer and the aluminum alloy outer layer;

[0026] Figure 6 for Figure 3 Installation diagram of aluminum alloy inner layer, aluminum alloy middle layer and aluminum alloy outer layer. DETAILED DESCRIPTION

[0027] The present invention is further explained below in conjunction with the accompanying drawings and specific embodiments. The embodiments are implemented based on the technical solution of the present invention. It should be understood that these embodiments are only used to illustrate the present invention and are not used to limit the scope of the present invention.

[0028] Example 1

[0029] like Figure 1 and Figure 2 As shown, an aluminum alloy medium voltage cable of the present embodiment comprises an inner cable core 1, the outer portion of the inner cable core 1 is coated with an aluminum alloy inner layer 2, the outer portion of the aluminum alloy inner layer 2 is coated with an aluminum alloy middle layer 3, and the outer portion of the aluminum alloy middle layer 3 is correspondingly coated with an aluminum alloy outer layer 4; and the outer portion of the aluminum alloy outer layer 4 of the present embodiment is correspondingly coated with a wrapping layer 5, the outer portion of the wrapping layer 5 of the present embodiment is correspondingly coated with an outer shielding layer 6, and the outer portion of the outer shielding layer 6 of the present embodiment is correspondingly coated with an outer sheath 7;

[0030] The aluminum alloy inner layer 2 and the aluminum alloy outer layer 4 of the present embodiment are both configured as an annular layered structure; while the aluminum alloy middle layer 3 of the present embodiment is configured as an annular wavy structure, and the aluminum alloy middle layer 3 of the present embodiment is composed of a continuously arranged wavy inner ring 31 and a wavy outer ring 32, the wavy inner ring 31 is convex to the outside, and the wavy inner ring 31 is concave to the inside, and the whole constitutes the aluminum alloy middle layer 3;

[0031] The aluminum alloy inner layer 2 of the present embodiment is pressed against the wavy inner ring 31 of the aluminum alloy middle layer 3 from the inside, and the aluminum alloy outer layer 4 of the present embodiment is pressed against the wavy outer ring 32 of the aluminum alloy middle layer 3. Through the structural design of the aluminum alloy middle layer 3, a transparent area 33 is formed between the aluminum alloy inner layer 2 and the aluminum alloy outer layer 4.

[0032] The internal cable core 1 of the present embodiment includes a cable core conductor 11, an insulating layer 12 coated on the outside of the cable core conductor 11, an inner shielding layer 13 coated on the outside of the insulating layer 12, and an inner sheath 14 coated on the outside of the inner shielding layer 13; and the aluminum alloy inner layer 2 of the present embodiment is correspondingly coated on the inner sheath 14.

[0033] In this embodiment, the inner shielding layer 13 and the outer shielding layer 6 are both configured as copper wire mesh braided layers, and the inner sheath 14 and the outer sheath 7 are both configured as fireproof sheaths.

[0034] The wavy outer ring 32 and the wavy inner ring 31 of the aluminum alloy middle layer 3 of the present embodiment are both configured as semicircular structures. The wavy outer ring 32 and the wavy inner ring 31 are consistent in size and are continuously butt-jointed to form an integral aluminum alloy middle layer 3.

[0035] In the technical solution of this embodiment, three layers of aluminum alloy are arranged on the outside of a normal medium-voltage cable, wherein the aluminum alloy inner layer and the aluminum alloy outer layer are both normal annular layered structures, while the aluminum alloy middle layer arranged in the middle is arranged in a wavy structure, and the specific shape of the aluminum alloy middle layer includes a wavy inner ring and a wavy outer ring, and the wavy outer ring and the wavy inner ring are arranged in an alternating and continuous manner to form an overall aluminum alloy middle layer; then the aluminum alloy inner layer corresponds to the wavy inner ring, and the aluminum alloy outer layer corresponds to the wavy outer ring. After the overall structure is installed, on the one hand, three layers of aluminum alloy layers are arranged, which have very good fire retardant effects; on the other hand, the aluminum alloy middle layer in the middle is arranged in a wavy structure, so that the interior of the cable has better air permeability, better heat dissipation function in a hot environment, and better working ability in extreme working environments.

[0036] Example 2

[0037] like Figure 3 , Figure 4 , Figure 5 and Figure 6 As shown, an aluminum alloy medium voltage cable of the present embodiment comprises an inner cable core 1, the outer portion of the inner cable core 1 is coated with an aluminum alloy inner layer 2, the outer portion of the aluminum alloy inner layer 2 is coated with an aluminum alloy middle layer 3, and the outer portion of the aluminum alloy middle layer 3 is correspondingly coated with an aluminum alloy outer layer 4; and the outer portion of the aluminum alloy outer layer 4 of the present embodiment is correspondingly coated with a wrapping layer 5, the outer portion of the wrapping layer 5 of the present embodiment is correspondingly coated with an outer shielding layer 6, and the outer portion of the outer shielding layer 6 of the present embodiment is correspondingly coated with an outer sheath 7;

[0038] The aluminum alloy inner layer 2 and the aluminum alloy outer layer 4 of the present embodiment are both configured as an annular layered structure; while the aluminum alloy middle layer 3 of the present embodiment is configured as an annular wavy structure, and the aluminum alloy middle layer 3 of the present embodiment is composed of a continuously arranged wavy inner ring 31 and a wavy outer ring 32, the wavy inner ring 31 is convex to the outside, and the wavy inner ring 31 is concave to the inside, and the whole constitutes the aluminum alloy middle layer 3;

[0039] The aluminum alloy inner layer 2 of the present embodiment is pressed against the wavy inner ring 31 of the aluminum alloy middle layer 3 from the inside, and the aluminum alloy outer layer 4 of the present embodiment is pressed against the wavy outer ring 32 of the aluminum alloy middle layer 3. Through the structural design of the aluminum alloy middle layer 3, a transparent area 33 is formed between the aluminum alloy inner layer 2 and the aluminum alloy outer layer 4.

[0040] The internal cable core 1 of the present embodiment includes a cable core conductor 11, an insulating layer 12 coated on the outside of the cable core conductor 11, an inner shielding layer 13 coated on the outside of the insulating layer 12, and an inner sheath 14 coated on the outside of the inner shielding layer 13; and the aluminum alloy inner layer 2 of the present embodiment is correspondingly coated on the inner sheath 14.

[0041] In this embodiment, the inner shielding layer 13 and the outer shielding layer 6 are both configured as copper wire mesh braided layers, and the inner sheath 14 and the outer sheath 7 are both configured as fireproof sheaths.

[0042] The wavy outer ring 32 and the wavy inner ring 31 of the aluminum alloy middle layer 3 of the present embodiment are both configured as semicircular structures. The wavy outer ring 32 and the wavy inner ring 31 are consistent in size and are continuously butt-jointed to form an integral aluminum alloy middle layer 3.

[0043] A support plate 34 adapted to the number and position of the wavy inner rings 31 is also provided at the outer end surface of the aluminum alloy inner layer 2 of this embodiment; the support plate 34 of this embodiment extends into the wavy outer ring 32 accordingly, presses the wavy outer ring 32 accordingly, and presses the aluminum alloy outer layer 4 accordingly.

[0044] In this embodiment, a support plate 34 corresponding to the number and position of the wavy outer rings 32 is provided at the inner end of the aluminum alloy outer layer 4. The support plate 34 extends into the wavy inner ring 31, is pressed against the wavy inner ring 31, and is pressed against the aluminum alloy inner layer 2.

[0045] In this embodiment, ten wave inner circles 31 and ten wave outer circles 32 are respectively provided, and twenty support plates 34 are respectively provided.

[0046] The technical solution of this embodiment is based on the technical solution of embodiment 1, and support plates are installed on the aluminum alloy inner layer and the aluminum alloy outer layer respectively. The support plate on the aluminum alloy inner layer corresponds to the position of the wave outer ring, and the support plate on the aluminum alloy outer layer corresponds to the position of the wave inner ring. The inner and outer support plates are extended into the corresponding ring bodies and correspondingly press the aluminum alloy layer. After this arrangement, a certain supporting force is given to the middle aluminum alloy middle layer. When subjected to external pressure, it is supported and fixed by the aluminum alloy outer layer, the aluminum alloy inner layer and the corresponding support plates in the middle, which can effectively increase the compressive resistance of the overall cable while ensuring air permeability. The structural design is very ingenious.

[0047] The above specific implementation is only a preferred embodiment of the present invention and is not intended to limit the implementation of the present invention and the scope of the claims. All equivalent changes and modifications made according to the content of the patent protection scope of the present invention should be included in the scope of the patent application of the present invention.

Claims

1. An aluminum alloy medium voltage cable, characterized in that: The cable comprises an inner cable core (1), the outer portion of the inner cable core (1) is coated with an inner aluminum alloy layer (2), the outer portion of the inner aluminum alloy layer (2) is coated with an intermediate aluminum alloy layer (3), and the outer portion of the intermediate aluminum alloy layer (3) is coated with an outer aluminum alloy layer (4); the outer portion of the outer aluminum alloy layer (4) is coated with a wrapping layer (5), the outer portion of the wrapping layer (5) is coated with an outer shielding layer (6), and the outer portion of the outer shielding layer (6) is coated with an outer sheath (7); The aluminum alloy inner layer (2) and the aluminum alloy outer layer (4) are both configured as an annular layered structure; and the aluminum alloy middle layer (3) is configured as an annular wavy structure, wherein the aluminum alloy middle layer (3) is composed of a continuously arranged wavy inner ring (31) and a wavy outer ring (32), wherein the wavy inner ring (31) is convex toward the outside and the wavy inner ring (32) is concave toward the inside, and the whole constitutes the aluminum alloy middle layer (3); The aluminum alloy inner layer (2) is pressed against the corrugated inner ring (31) of the aluminum alloy middle layer (3) from the inside, and the aluminum alloy outer layer (4) is pressed against the corrugated outer ring (32) of the aluminum alloy middle layer (3). Through the structural design of the aluminum alloy middle layer (3), a transparent area (33) is formed between the aluminum alloy inner layer (2) and the aluminum alloy outer layer (4).

2. The aluminum alloy medium voltage cable according to claim 1, characterized in that: The inner cable core (1) comprises a cable core conductor (11), an insulating layer (12) coated on the outside of the cable core conductor (11), an inner shielding layer (13) coated on the outside of the insulating layer (12), and an inner sheath (14) coated on the outside of the inner shielding layer (13); and the aluminum alloy inner layer (2) is correspondingly coated on the inner sheath (14).

3. The aluminum alloy medium voltage cable according to claim 2, characterized in that: The inner shielding layer (13) and the outer shielding layer (6) are both configured as copper wire mesh braided layers, and the inner sheath (14) and the outer sheath (7) are both configured as fireproof sheaths.

4. The aluminum alloy medium voltage cable according to claim 1, characterized in that: The wavy outer ring (32) and the wavy inner ring (31) of the aluminum alloy middle layer (3) are both configured as semicircular structures. The wavy outer ring (32) and the wavy inner ring (31) are of the same size and are continuously butt-jointed to form an integral aluminum alloy middle layer (3).

5. The aluminum alloy medium voltage cable according to claim 4, characterized in that: A support plate (34) adapted to the number and position of the wavy inner rings (31) is also provided at the outer end surface of the aluminum alloy inner layer (2); the support plate (34) extends into the wavy outer ring (32) and presses against the wavy outer ring (32) and the aluminum alloy outer layer (4).

6. The aluminum alloy medium voltage cable according to claim 5, characterized in that: A support plate (34) corresponding to the number and position of the wavy outer rings (32) is provided at the inner end of the aluminum alloy outer layer (4); the support plate (34) extends into the wavy inner ring (31) and is pressed against the wavy inner ring (31) and against the aluminum alloy inner layer (2).

7. The aluminum alloy medium voltage cable according to claim 6, characterized in that: Ten of the wave inner rings (31) and the wave outer rings (32) are correspondingly provided, and twenty of the support plates (34) are correspondingly provided.

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