A kind of slow pressure type copper-aluminum alloy photovoltaic cable

Abstract

The application belongs to the technical field of photovoltaic cables, and particularly relates to a slow-pressure copper-aluminum alloy photovoltaic cable. The slow-pressure copper-aluminum alloy photovoltaic cable comprises a filling layer arranged on a plurality of conductors, an armor layer arranged outside the filling layer, a plurality of slow-pressure strip groups and a plurality of slow-pressure strips arranged outside the armor layer, each slow-pressure strip has a plurality of circumferential arrangements, and the slow-pressure strip groups and the circumferential slow-pressure strips are alternately distributed layer by layer. Chambers are formed between adjacent slow-pressure strips in the same layer, and the outermost slow-pressure strip is jointly and fixedly connected with an outer skin. The slow-pressure strips are sequentially deformed under pressure, when a vehicle passes over the cable and causes the cable to be pressed, the slow-pressure strips from the outermost layer to the innermost layer are sequentially deformed in the vertical direction of the pressure, the chambers provide space for the deformation of the slow-pressure strips, thereby gradually absorbing the pressure on the cable, dispersing the local stress generated when the cable is pressed, and reducing the risk of the cable being broken under pressure.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of photovoltaic cables, and particularly relates to a pressure-relieving copper-aluminum alloy photovoltaic cable. BACKGROUND

[0002] A photovoltaic cable is a special cable specially designed for a solar photovoltaic system. As a key component for connecting a solar component and a power system, the photovoltaic cable is exposed to a complex environment (such as ground laying, mechanical rolling, temperature difference change, etc.) for a long time during use, and needs to have excellent pressure resistance, torsion resistance and tensile resistance. The traditional photovoltaic cable is mostly made of pure copper conductor, which has good electrical conductivity but high cost and weak creep resistance. Although the pure aluminum conductor is low in cost, it has problems of insufficient mechanical strength, easy breakage and poor electrical conductivity compared with copper. The copper-aluminum alloy conductor twisted together can achieve a certain balance between electrical conductivity and mechanical properties.

[0003] The existing photovoltaic cable is laid on the ground or has a shallow burial depth, and the existing cable only relies on the deformation of the outer skin to buffer the pressure. When a vehicle passes over the cable, the local pressure is directly transmitted to the conductor inside the cable, causing the outer skin to be crushed and the twisted conductor inside to be deformed, thereby affecting the normal use of the cable. SUMMARY

[0004] In order to overcome the shortcomings pointed out in the background, the application provides a pressure-relieving copper-aluminum alloy photovoltaic cable.

[0005] The technical scheme is as follows: a pressure-relieving copper-aluminum alloy photovoltaic cable, comprising a filling layer arranged on a plurality of conductors, an armor layer arranged outside the filling layer, a plurality of buffer layer groups and a plurality of pressure relief strips for buffering pressure arranged outside the armor layer, each layer of the pressure relief strips has a plurality of circumferentially arranged pressure relief strips, and the buffer layer groups and the circumferentially arranged pressure relief strips are alternately distributed layer by layer.

[0006] The adjacent pressure relief strips in the same layer form a cavity, and the outer portions of the outermost pressure relief strips are fixedly connected together.

[0007] Further, the pressure relief strips are in a threaded shape.

[0008] Further, the threads of the pressure relief strips in adjacent two layers are in opposite directions.

[0009] Further, the elastic coefficients of all the pressure relief strips decrease from the inner layer to the outer layer.

[0010] Further, the buffer layer group comprises inner layers, the inner layer closest to the armor layer is fixed to the inner layer of the buffer layer group, and the inner layer closest to the axis is fixed to the buffer strip closest to the axis, the outer side of the inner layer is fixed to the intermediate layer, the intermediate layer is fixed to the outer layer, and the outer layer is attached to the adjacent buffer strip.

[0011] Further, the outer layer closest to the outer skin is made of flame-retardant material.

[0012] Further, the outer layer is fixed to a limiting strip arranged circumferentially and having the same number as the buffer strip on the outer layer, the limiting strip is thread-like, the thread direction of the limiting strip is the same as that of the adjacent buffer strip, the limiting strip is attached to the adjacent buffer strip, and the limiting strip is used to block the adjacent buffer strip.

[0013] Further, the surface of the outer layer in contact with the circumferentially arranged buffer strip is a friction surface.

[0014] Further, the intermediate layer is composed of a plurality of elastic strips with a V-shaped cross section.

[0015] Further, the angle of the inner bend of the elastic strip on all the intermediate layers decreases from the inner layer to the outer layer.

[0016] In summary, the present application has at least one of the following beneficial technical effects: 1. The present application allows the multi-layer buffer strip to deform under pressure, when the vehicle passes over the cable and causes the cable to be pressed, the multi-layer buffer strip from the outer layer to the inner layer deforms in the vertical direction of the pressure, the cavity provides space for the deformation of the buffer strip, thereby gradually absorbing the pressure on the cable, dispersing the local stress generated when the cable is pressed, and reducing the risk of cable rupture under pressure;

[0017] 2. By making the buffer strip thread-like, and the thread direction of the adjacent two layers of buffer strip opposite, no matter which direction the cable twists, a part of the buffer strip rotates along its thread direction, and the other part of the buffer strip rotates in the opposite direction of its thread direction, the diameter of the buffer strip rotating along the thread direction will decrease, the buffer strip rotating against the thread direction will increase in diameter, and the buffer strip will increase in diameter, while increasing the buffer capacity of the cable under pressure, ensuring the torsional performance of the cable, and reducing the diameter change of the buffer strip when it is twisted, thereby reducing the probability of wrinkling, breaking or damage of the outer skin, and improving the structural strength of the cable;

[0018] 3, By the limiting strip to adjacent pressure bar to block, to reduce the probability of torsion of the pressure bar, thereby enhancing the anti-torsion performance of the cable, and when the cable is pulled, by the thread-like pressure bar and the thread-like limiting strip are engaged with each other, reduce the probability of the outer skin and its internal structure when the hard pull skin dislocation, thereby increasing the tensile strength of the structure.

[0019] In summary, the structure enhances the cable buffer performance while ensuring the anti-torsion performance and tensile performance of the cable. BRIEF DESCRIPTION OF DRAWINGS

[0020] Figure 1 is a schematic diagram of the three-dimensional structure of the present application;

[0021] Figure 2 is a schematic diagram of the three-dimensional structure of the present application;

[0022] Figure 3 is a schematic diagram of the three-dimensional structure of the present application;

[0023] Figure 4 is a schematic diagram of the three-dimensional structure of the present application.

[0024] Wherein: 1 - conductor, 2 - filling layer, 3 - armored layer, 4 - buffer layer group, 401 - internal layer, 402 - intermediate layer, 403 - external layer, 5 - pressure bar, 501 - chamber, 6 - skin, 7 - limiting strip. DETAILED DESCRIPTION

[0025] The present application will be further described below in conjunction with the drawings and examples. Example 1

[0026] This example discloses a pressure buffer type copper-aluminum alloy photovoltaic cable for buffering pressure when the cable is under pressure.

[0027] As Figures 1-3As shown, it includes a filling layer 2 arranged on several conductors 1, the conductor 1 is an existing structure, the conductor 1 is a multi-strand wire twisted together, the conductor 1 is made of copper-aluminum alloy, the conductivity of the copper-aluminum alloy conductor is slightly lower than that of pure copper, but the multi-strand twisted design can improve flexibility, and the tensile strength and creep resistance are better than pure aluminum. The choice of material for the filling layer 2 can be selected according to specific scenarios, such as PP (flame retardant requirements), mineral materials (fire resistance) or polyester fiber (mechanical strength), an armor layer 3 is wound around the filling layer 2, the armor layer 3 is used to enhance the tensile, compressive and impact resistance of the cable, and a plurality of buffer layer groups 4 and a plurality of pressure relief strips 5 are arranged outside the armor layer 3 for buffering pressure. The pressure relief strips 5 are made of elastic material. The figure only shows two layers of pressure relief strips 5 and two layers of buffer layer groups 4 distributed alternately. In the actual production process, multiple layers of pressure relief strips 5 and buffer layer groups 4 can be set as needed, and each layer of pressure relief strips 5 has a circumferential distribution. There are several buffer layer groups 4 and circumferentially arranged pressure relief strips 5 that are alternately distributed layer by layer; a cavity 501 is formed between adjacent pressure relief strips 5 of the same layer, and the outer side of the outermost pressure relief strip 5 is fixedly connected with an outer skin 6. When the cable is under pressure (such as the cable is laid on the ground or buried shallowly, and the vehicle passes by the cable, causing the cable to be under pressure), the outer skin 6 is first compressed and deformed, and then the outermost pressure relief strip 5 is compressed and deformed, and the space of the outermost cavity 501 is deformed. Then the outermost buffer layer group 4 is compressed, and then the next layer of pressure relief strip 5 is compressed and deformed. In this way, the multi-layer structure is compressed and deformed in sequence, so that the multi-layer pressure relief strips 5 from the outer layer to the inner layer are deformed in the direction perpendicular to the pressure. The cavity 501 provides the space required for deformation for the adjacent pressure relief strips 5. The pressure on the cable is absorbed step by step through the deformation of the pressure relief strip 5, and the local stress generated when the cable is under pressure is dispersed, thereby reducing the risk of the cable rupture under pressure.

[0028] Pressure relief strip 5:

[0029] like Figure 3 As shown, during the installation process or when the cable moves due to external force, the cable as a whole will twist (such as when a vehicle passes by, causing the cable as a whole to be pushed and twisted), thereby causing the insulation layer (i.e., the outer skin 6) to wrinkle, break and damage. The pressure relief strip 5 is threaded to enhance the torsional resistance of the pressure relief strip 5.

[0030] like Figure 3As shown, the adjacent two layers of pressure relief strips 5 have opposite thread directions, no matter which direction the cable twists, a part of the pressure relief strips 5 rotates along the thread direction, and the other part of the pressure relief strips 5 rotates against the thread direction. The pressure relief strips 5 rotating against the thread direction bear a large rotational resistance. When the cable is under pressure, the pressure relief strips 5 can increase the cable's buffering capacity while ensuring the cable's torsional resistance. When the pressure relief strips 5 rotate, the diameter changes. The diameter of the pressure relief strips 5 rotating along the thread direction decreases, and the diameter of the pressure relief strips 5 rotating against the thread direction increases. By alternately arranging pressure relief strips 5 with different thread directions, the diameter change of the cable under torsion is reduced, thereby reducing the probability of the outer skin 6 wrinkling, breaking, or being damaged, and improving the cable's structural strength.

[0031] The elastic coefficients of all the pressure relief strips 5 decrease from the inner layer to the outer layer, so that the overall pressure resistance of the cable gradually increases from the outside to the inside, thereby enhancing the cable's layer-by-layer pressure relief capacity.

[0032] The specific structure of the buffer layer group 4 is as follows:

[0033] As shown in the figure, Figure 2 With Figure 4 As shown, the buffer layer group 4 includes an inner layer 401. The inner layer 401 of the innermost buffer layer group 4 is fixedly connected to the armored layer 3, and the inner layer 401 of the remaining buffer layer group 4 is fixedly connected to the pressure relief strip 5 close to the axial side. The outer side of the inner layer 401 is fixedly connected to an intermediate layer 402, and the intermediate layer 402 is fixedly connected to an outer layer 403. The inner layer 401, the intermediate layer 402, and the outer layer 403 are all made of elastic material. The outer layer 403 is in close contact with the adjacent pressure relief strip 5. When the cable is under pressure, the inner layer 401, the intermediate layer 402, and the outer layer 403 deform to buffer the pressure.

[0034] The outer layer 403 close to the outer skin 6 is made of flame-retardant material, such as halogen-free flame-retardant TPE, which is used to protect the conductor 1 inside the cable. Example 2

[0035] This embodiment discloses a pressure relief type copper-aluminum alloy photovoltaic cable, which further enhances the cable's pressure resistance and torsional resistance on the basis of example 1.

[0036] As shown in the figure, Figures 2-4As shown, the outer layer 403 is fixed with a plurality of limiting strips 7 arranged circumferentially and having the same number as the number of the pressure relief strips 5 on the outer layer, the limiting strips 7 have a higher hardness than the pressure relief strips 5, the limiting strips 7 are thread-shaped, the thread rotation direction of the limiting strips 7 is the same as that of the adjacent pressure relief strips 5, the limiting strips 7 are in contact with the adjacent pressure relief strips 5, when the pressure relief strips 5 are reversely rotated along the thread rotation direction, the pressure relief strips 5 press the adjacent limiting strips 7, the limiting strips 7 block the adjacent pressure relief strips 5, so as to reduce the torsion amplitude of the pressure relief strips 5, thereby enhancing the torsion resistance of the cable, and when the cable is pulled (such as being pulled by a chain system during installation), the thread-shaped pressure relief strips 5 and the thread-shaped limiting strips 7 are engaged with each other, so as to reduce the probability of relative dislocation between the layers of the cable, which is similar to the engagement between the thread structure of a mineral water bottle and the thread structure of a mineral water bottle cap, for example, the outer skin 6 and the pressure relief strips 5 are similar to the cap and the thread structure of the cap, the outer layer 403 and the limiting strips 7 are similar to the bottle opening and the thread structure of the bottle opening, so as to reduce the probability of dislocation between the outer skin 6 and the internal structure when the outer skin 6 is pulled hard, thereby increasing the tensile strength of the structure.

[0037] The surface of the outer layer 403 in contact with the adjacent circumferentially arranged pressure relief strips 5 is a friction surface, so as to increase the resistance when the pressure relief strips 5 are twisted, thereby increasing the torsion resistance of the pressure relief strips 5. Embodiment 3

[0038] The embodiment discloses a pressure relief type copper-aluminum alloy photovoltaic cable, which is further improved on the basis of embodiment 2.

[0039] As shown in the drawings, Figure 4 As shown, the intermediate layer 402 is composed of a plurality of elastic strips with a V-shaped cross section, for example, the elastic strips on the upper side of the intermediate layer 402 are deformed by being stretched to the left and right sides, so as to further buffer the pressure.

[0040] The angles of the inner bending positions of the elastic strips on all the intermediate layers 402 are gradually reduced from the inner layer to the outer layer, so as to gradually increase the compression resistance of the cable from the outside to the inside, thereby enhancing the layer-by-layer pressure relief capacity of the cable.

[0041] The above is only the preferred embodiment of the present application, and it should be pointed out that, for ordinary skilled persons in the art, some improvements and refinements can be made without departing from the principles of the present application, and these improvements and refinements should also be regarded as the protection scope of the present application.

Claims

1. A slow pressure type copper-aluminum alloy photovoltaic cable, comprising a filler layer (2) arranged at a plurality of conductors (1), and an armor layer (3) arranged outside the filler layer (2), characterized in that, The armored layer (3) is externally provided with a plurality of buffer layer groups (4) for buffering pressure and a plurality of buffer strips (5), each layer of the buffer strips (5) has a plurality of circumferential arrangements, and the buffer layer groups (4) and the circumferentially arranged buffer strips (5) are alternately distributed layer by layer. Chambers (501) are formed between adjacent buffer strips (5) in the same layer, and the outer portions of the outermost buffer strips (5) are collectively fixedly connected with an outer skin (6); The buffer strips (5) are in a threaded shape; The thread directions of the buffer strips (5) in adjacent two layers are opposite; The buffer layer group (4) comprises an outer layer (403); The outer layer (403) is fixedly connected with a plurality of limiting strips (7) arranged circumferentially and having the same number as the buffer strips (5) on the outer layer, the limiting strips (7) are in a threaded shape, the thread direction of the limiting strips (7) is the same as that of the adjacent buffer strips (5), the limiting strips (7) are in contact with the adjacent buffer strips (5), and the limiting strips (7) are used for blocking the adjacent buffer strips (5).

2. A pressure-relieving copper-aluminum alloy photovoltaic cable according to claim 1, characterized in that, The elastic coefficients of all the buffer strips (5) decrease from the inner layer to the outer layer.

3. A pressure-relieving copper-aluminum alloy photovoltaic cable according to claim 2, characterized in that, The buffer layer group (4) comprises an inner layer (401), the inner layer (401) of the innermost buffer layer group (4) is fixedly connected with the armored layer (3), the inner layers (401) of the remaining buffer layer groups (4) are fixedly connected with the buffer strips (5) close to the axial side thereof, the outer side of the inner layer (401) is fixedly connected with an intermediate layer (402), the intermediate layer (402) is fixedly connected with an outer layer (403), and the outer layer (403) is in contact with the adjacent buffer strips (5).

4. A pressure-relieving copper-aluminum alloy photovoltaic cable according to claim 3, characterized in that, The outer layer (403) close to the outer skin (6) is made of a flame-retardant material.

5. A pressure-relieving copper-aluminum alloy photovoltaic cable according to claim 4, characterized in that, The surface of the outer layer (403) in contact with the circumferentially arranged buffer strips (5) is a friction surface.

6. A pressure-relieving copper-aluminum alloy photovoltaic cable according to claim 3, characterized in that, The intermediate layer (402) is composed of a plurality of elastic strips with a V-shaped cross section.

7. A pressure-relieving copper-aluminum alloy photovoltaic cable according to claim 6, characterized in that, The angles of the inner bending portions of the elastic strips on all the intermediate layers (402) decrease from the inner layer to the outer layer.

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