Multiphase composite cable

Abstract

The utility model discloses a multiphase composite cable which comprises a body, the body comprises three main core wires 1 and a neutral wire 2, the three main core wires 1 are used for transmitting current, the neutral wire 2 is used for ensuring the current transmission stability of the three main core wires 1, the wire diameters of the three main core wires 1 are the same, and the wire diameters of the three main core wires 1 are the same. The wire diameter of the neutral wire 2 is smaller than that of the main core wires 1 and larger than the maximum diameter of a filling gap when the three main core wires 1 abut against and gather into a circle, the circle centers of the three main core wires 1 and the circle center of the neutral wire 2 are evenly distributed in the circumferential direction of the circle with the circle center arranged on the axis, and the three main core wires 1 and the neutral wire 2 gather into a cable core. The outer layer of the cable core is wrapped by a copper wire wrapping layer 3 and a nylon sheath layer 4. The utility model discloses a multiphase composite cable which enables a three-phase cable with a neutral line to keep balance in gravity center so as to guarantee laying quality.

Description

Technical Field

[0001] The utility model relates to the field of cables, and more specifically to a multi-phase composite cable. Background Art

[0002] In some three-phase cables, in order to ensure the stability and safety of current transmission in the three-phase cable, a neutral wire is often added. During normal operation, the neutral wire can reduce the voltage deviation caused by capacitance and inductance, ensuring the quality of power transmission; when the three-phase cable load is unbalanced, it can provide a return path for the current, ensuring that the vector sum of the currents is 0, thus guaranteeing the safety of cable use.

[0003] However, the wire diameter of the neutral wire after being formed according to actual requirements is often smaller than the wire diameters of the three main core wires of the three-phase cable but larger than the maximum diameter of the filling gap when the three main core wires are gathered together to form a circle, resulting in difficulty in achieving the balance of the cable's center of gravity when the three main core wires and the neutral wire are gathered into a circle. During the cable laying process, the laying quality of the cable is not high and it is prone to deflection. Summary of the Invention

[0004] The technical problem to be solved by the utility model is to provide a multi-phase composite cable that can keep the center of gravity of a three-phase cable with a neutral wire balanced, thereby ensuring the laying quality.

[0005] The technical solution adopted by the utility model to solve the above problems is: a multi-phase composite cable, including a body. The body includes three main core wires and a neutral wire. The three main core wires are used for transmitting current, and the neutral wire is used to ensure the stability of current transmission of the three main core wires. The wire diameters of the three main core wires are the same. The wire diameter of the neutral wire is smaller than that of the main core wires and larger than the maximum diameter of the filling gap when the three main core wires are gathered together to form a circle. The centers of the three main core wires and the center of one neutral wire are evenly distributed along the circumference of a circle with a center on the axis. After the three main core wires and one neutral wire are gathered into a cable core, the outer layer of the cable core is wrapped with a copper wire wrapping layer and a nylon sheath layer.

[0006] Compared with the prior art, the advantages of the present utility model are as follows: During the process of converging three main core wires and one neutral wire, it is only necessary to ensure that the centers of the three main core wires and the center of the one neutral wire are evenly distributed circumferentially along a circle with a center located on the axis, and it is easy to achieve the purpose of controlling the center of gravity of the body, with weaker randomness and more solutions. To meet the purpose of evenly distributing the centers of the three main core wires and the center of the one neutral wire circumferentially along a circle with a center located on the axis, different filling strip filling schemes can be adopted to solve it; at the same time, in traditional cables, a semiconductive water-resistant buffer tape and a lead sheath are wrapped around the outer layer of the main core wire and the outer layer of the neutral wire. Among them, the lead sheath is metal and toxic, and the wire diameters of the main core wire and the neutral wire are different, so it is easy to cause serious imbalance of the center of gravity of the body after wrapping the lead sheath. Therefore, a PE inner sheath is used for fixation outside the semiconductive water-resistant buffer tape, and the design of the lead sheath is cancelled. However, a copper wire wrapping layer and a nylon sheath layer structure are added to the outer layer of the cable core, which not only retains the waterproof function of the lead sheath but also solves the problems of center of gravity imbalance and toxicity of the lead sheath, ensuring high-quality molding of the body.

[0007] As an improvement of the present utility model, the body further includes a cross-shaped cross filling strip. The center of the cross filling strip is located at the center of the body. The four ends of the cross filling strip abut against the copper wire wrapping layer. The three main core wires and one neutral wire are respectively arranged in the four regions separated by the cross filling strip. Through this improvement, through the design of the cross filling strip, the cable core region is evenly distributed. The three main core wires and one neutral wire are all independent in one region. Therefore, when converging the three main core wires and one neutral wire, interference between them can be avoided, and it is easy to ensure that the centers of the three main core wires and the center of the one neutral wire are evenly distributed circumferentially along a circle with a center located on the axis.

[0008] As an improvement of the present utility model, the four regions include three main core wire fixing regions for accommodating the main core wires and one neutral wire fixing region for accommodating the neutral wire. The main core wire fixing regions are provided with main core wire fixing grooves for fitting with the main core wires, and the neutral wire fixing region is provided with a neutral wire fixing hole for fitting with the neutral wire. Through this improvement, it is easy to position the main core wires through the design of the main core wire fixing grooves, and it is easy to position the neutral wire through the design of the neutral wire fixing holes. Therefore, as long as it is ensured that the positioning centers of the main core wire fixing grooves and the positioning center of the neutral wire fixing hole are evenly distributed circumferentially along a circle with a center located on the axis, it can be ensured that the centers of the three main core wires and the center of the one neutral wire are evenly distributed circumferentially along a circle with a center located on the axis, thereby ensuring high-quality molding of the cable core.

[0009] As an improvement of the present utility model, one side of the main core wire away from the axis is concentric with the notch of the main core wire fixing groove and both are in contact with the copper wire wrapping layer. Through the above improvement, the usage amount of the filling strip can be reduced, thereby reducing the wire diameter of the cable core and lightening the weight of the body.

[0010] As an improvement of the present utility model, on one side of the neutral wire fixing hole away from the axis, there is an embedding slot for embedding the neutral wire. The embedding slot expands when the neutral wire is embedded in the neutral wire fixing hole and closes after the neutral wire is completely embedded in the neutral wire fixing hole. Through the above improvement, the installation of the neutral wire by the neutral wire fixing hole is realized.

[0011] As an improvement of the present utility model, at the center of the cross-shaped filling strip, there is a first hollow hole, and inside the first hollow hole, there is a cross-shaped first reinforcing rib. The cross of the first reinforcing rib is inclined at 45° to the cross of the cross-shaped filling strip. Through the above improvement, the design of the first hollow hole can lighten the weight of the body, while the design of the first reinforcing rib can ensure that the center will not be deformed due to the extrusion of the main core wire and the neutral wire.

[0012] As an improvement of the present utility model, at the four ends of the cross-shaped filling strip, there are second hollow holes. Inside the second hollow holes, there are second reinforcing ribs arranged along the radial direction of the adjacent main core wire or neutral wire and third reinforcing ribs arranged along the radial direction of the body. Through the above improvement, the design of the second hollow hole can lighten the weight of the body, while the design of the second reinforcing ribs and the third reinforcing ribs can ensure that the second hollow holes will not be deformed due to the extrusion of the main core wire and the neutral wire.

[0013] As an improvement of the present utility model, the body includes an expanding filling strip. The expanding filling strip wraps around the outside of the neutral wire so that the wire diameter of the neutral wire is equal to the wire diameters of the three main core wires. Through the above improvement, through the design of the expanding filling strip, it is only necessary to gather and twist the three main core wires and one neutral wire as a conventional four-core cable, and fill the corresponding filling strips in each gap.

[0014] As an improvement of the present utility model, the expanding filling strip is provided with an embedding port for embedding the neutral wire. The embedding port faces the axis direction of the body, and both ends of the embedding port are in contact with the adjacent two main core wires respectively. Through the above improvement, the wrapping of the neutral wire by the expanding filling strip is realized. The design of the embedding port makes it easy for the neutral wire to be embedded into the expanding filling strip. The embedding port facing the axis direction of the body can avoid the depression at the embedding port when the copper wire wrapping layer and the nylon sheath layer are coated on the cable core. Description of the Drawings

[0015] Figure 1 It is a schematic diagram of the entire cross-sectional structure of the first embodiment of the present utility model.

[0016] Figure 2 It is a schematic diagram of the entire cross-sectional structure of the second embodiment of the present utility model.

[0017] Figure 3 It is a schematic diagram of the entire cross-sectional structure of this traditional multi-phase cable.

[0018] As shown in the figure: 1. Main core wire, 2. Neutral wire, 3. Copper wire wrapping layer, 4. Nylon sheath layer, 5. Cross-shaped filling strip, 5.1. Main core wire fixing groove, 5.2. Neutral wire fixing hole, 5.2.1. Embedding seam, 5.3. First hollow hole, 5.4. First reinforcing rib, 5.5. Second hollow hole, 5.6. Second reinforcing rib, 5.7. Third reinforcing rib, 6. Diameter-expanding filling strip, 6.1. Embedding port, 7. Semiconductor water-resistant buffer strip, 8. PE inner sheath, 9. Lead sheath, 10. Central filling strip. Specific embodiments

[0019] The embodiments of the present utility model will be further described below with reference to the accompanying drawings.

[0020] Embodiment 1:

[0021] As Figure 1 shown, a multi-phase composite cable includes a body. The body includes three main core wires 1 and one neutral wire 2. The three main core wires 1 are used to transmit current, and the neutral wire 2 is used to ensure the current transmission stability of the three main core wires 1. The three main core wires 1 have the same wire diameter. The wire diameter of the neutral wire 2 is smaller than that of the main core wire 1 and larger than the maximum diameter of the filling gap when the three main core wires 1 are butted and converged into a circle. The centers of the three main core wires 1 and the center of one neutral wire 2 are evenly distributed along the circumference of a circle with a center on the axis. After the three main core wires 1 and one neutral wire 2 are converged into a cable core, the outer layer of the cable core is wrapped with a copper wire wrapping layer 3 and a nylon sheath layer 4.

[0022] The body further includes a cross-shaped cross filling strip 5. The center of the cross filling strip 5 is located at the center of the body. The four ends of the cross filling strip 5 abut against the copper wire wrapping layer 3. The three main core wires 1 and one neutral wire 2 are respectively arranged in the four regions separated by the cross filling strip 5. The four regions include three main core wire fixing regions for accommodating the main core wires 1 and one neutral wire fixing region for accommodating the neutral wire 2. The main core wire fixing region is provided with a main core wire fixing groove 5.1 for fitting with the main core wire 1, and the neutral wire fixing region is provided with a neutral wire fixing hole 5.2 for fitting with the neutral wire 2.

[0023] One side of the main core wire 1 away from the axis is concentric with the notch of the main core wire fixing groove 5.1 and both are in contact with the copper wire wrapping layer 3. One side of the neutral wire fixing hole 5.2 away from the axis is provided with an embedding slot 5.2.1 for embedding the neutral wire 2. The embedding slot 5.2.1 expands when the neutral wire fixing hole 5.2 embeds the neutral wire 2 and closes after the neutral wire 2 is completely embedded in the neutral wire fixing hole 5.2. A first hollow hole 5.3 is provided at the center of the cross-shaped filling strip 5. A cross-shaped first reinforcing rib 5.4 is provided in the first hollow hole 5.3. The cross of the first reinforcing rib 5.4 is inclined at 45° to the cross of the cross-shaped filling strip 5. Second hollow holes 5.5 are provided at the four ends of the cross-shaped filling strip 5. Second reinforcing ribs 5.6 arranged along the radial direction of the adjacent main core wire 1 or neutral wire 2 and third reinforcing ribs 5.7 arranged along the radial direction of the body are provided in the second hollow holes 5.5.

[0024] During the process of embedding the three main core wires 1 and one neutral wire 2 into the cross-shaped filling strip 5, first utilize the space of the main core wire fixing groove 5.1, use an opener to fully open the embedding slot 5.2.1, and after embedding the neutral wire 2, then embed the three main core wires 1 into the main core wire fixing grooves 5.1 one by one.

[0025] Embodiment 2:

[0026] A multi-phase composite cable includes a body, characterized in that: the body includes three main core wires 1 and one neutral wire 2. The three main core wires 1 are used for transmitting current, and the neutral wire 2 is used to ensure the current transmission stability of the three main core wires 1. The diameters of the three main core wires 1 are the same. The diameter of the neutral wire 2 is smaller than that of the main core wire 1 and larger than the maximum diameter of the filling gap when the three main core wires 1 are in contact and converge into a circle. The centers of the three main core wires 1 and the center of one neutral wire 2 are evenly distributed along the circumference of a circle with a center on the axis. After the three main core wires 1 and one neutral wire 2 converge into a cable core, the outer layer of the cable core is wrapped with a copper wire wrapping layer 3 and a nylon sheath layer 4.

[0027] The body includes an expansion filling strip 6. The expansion filling strip 6 is wrapped outside the neutral wire 2 to make the diameter of the neutral wire 2 equal to that of the three main core wires 1. The expansion filling strip 6 is provided with an embedding port 6.1 for embedding the neutral wire 2. The embedding port 6.1 faces the axis direction of the body, and both ends of the embedding port 6.1 are in contact with the adjacent two main core wires 1.

[0028] During the process of gathering three main core wires 1 and one neutral wire 2, first embed the neutral wire 2 into the diameter-expanded filling strip 6, and then adjust the direction of the embedding port 6.1. At this time, to ensure the tightness of the gathering of the three main core wires 1 and one neutral wire 2, a central filling strip 10 is made in the center of the cable core. The four directions of the central filling strip 10 respectively fit with the three main core wires 1 and the neutral wire 2 with the embedded item. Then, the subsequent forming of the multi-phase composite cable is completed according to the manufacturing method of the traditional four-core cable with the same diameter.

[0029] Traditional embodiment:

[0030] As Figure 3 shown, to ensure the center-of-gravity balance of the multi-phase composite cable, multiple filling strips of different sizes are designed inside the multi-phase composite cable. And to adapt to the center-of-gravity offset of the neutral wire 2, the three main core wires 1 are not evenly distributed inside the cable core, resulting in the inconsistent distribution of the three main core wires 1 when forming the cable core. At the same time, the roundness of the cable core is low, so that a high-quality multi-phase composite cable cannot be formed.

[0031] At the same time, to improve the center-of-gravity uniformity of the multi-phase composite cable and the environmental use safety, the lead sheath 9 in the traditional multi-phase composite cable is removed, but the semiconductive water-blocking buffer tapes 7 and the PE inner sheath 8 on the surfaces of the three main core wires 1 and one neutral wire 2 are retained. Instead, a copper wire wrapping layer 3 and a nylon sheath layer 4 are arranged on the outer layer of the cable core, which not only ensures the strength and waterproof function of the multi-phase composite cable, but also avoids the environmental pollution caused by lead metal to the ocean.

[0032] The above is only an illustration of the best embodiment of the present invention, but it should not be construed as a limitation to the claims. The present invention is not limited to the above embodiments, and its specific structure is allowed to change. All changes made within the protection scope of the independent claims of the present invention are within the protection scope of the present invention.

Claims

1. A multiphase composite cable, comprising a body, characterized in that: The body comprises three main core wires (1) and a neutral wire (2), the three main core wires (1) are used to transmit current, the neutral wire (2) is used to ensure the current transmission stability of the three main core wires (1), the three main core wires (1) have the same wire diameter, the wire diameter of the neutral wire (2) is smaller than the wire diameter of the main core wires (1) and larger than the maximum diameter of the filling gap when the three main core wires (1) are offset and converged into a circle, the centers of the three main core wires (1) and the center of the neutral wire (2) are evenly distributed along the circumference of a circle whose center is located on the axis, and after the three main core wires (1) and the neutral wire (2) are converged into a cable core, the outer layer of the cable core is wrapped with a copper wire sheath (3) and a nylon sheath layer (4).

2. A multiphase composite cable according to claim 1, characterized in that: The main body further comprises a cross-shaped cross filling bar (5), the center of the cross filling bar (5) is arranged at the center of the main body, the four ends of the cross filling bar (5) are against the copper wire sheath (3), and the three main core wires (1) and a neutral wire (2) are respectively arranged in four areas separated by the cross filling bar (5).

3. A multiphase composite cable according to claim 2, characterized in that: The four areas include three main core wire (1) fixing areas for accommodating the main core wire (1) and one neutral wire (2) fixing area for accommodating the neutral wire (2), the main core wire (1) fixing areas are provided with main core wire fixing grooves (5.1) for matching with the main core wire (1), and the neutral wire (2) fixing areas are provided with neutral wire fixing holes (5.2) for matching with the neutral wire (2).

4. A multiphase composite cable according to claim 3, characterized in that: The side of the main core wire (1) away from the axis is arranged concentrically with the notch of the main core wire fixing groove (5.1) and both are against the copper wire wrapping layer (3).

5. A multiphase composite cable according to claim 3, characterized in that: The neutral line fixing hole (5.2) is provided with an embedding slot ( 5.2.1), the embedding seam (5.2.1) is expanded when the neutral line fixing hole (5.2) is embedded in the neutral line (2), and is closed after the neutral line (2) is completely embedded in the neutral line fixing hole (5.2).

6. A multiphase composite cable according to claim 2, characterized in that: A first hollow hole (5.3) is provided at the center of the cross filling strip (5), a cross-shaped first reinforcing rib (5.4) is provided in the first hollow hole (5.3), and the cross of the first reinforcing rib (5.4) is inclined at 45 degrees to the cross of the cross filling strip (5).

7. A multiphase composite cable according to claim 2, characterized in that: The four ends of the cross filling strip (5) are provided with second hollow holes (5.5), and the second hollow holes (5.5) are provided with second reinforcing ribs (5.6) arranged radially along the adjacent main core line (1) or neutral line (2) and third reinforcing ribs (5.7) arranged radially along the body.

8. The multiphase composite cable according to claim 1, characterized in that: The main body comprises a diameter-expanding filling strip (6), and the diameter-expanding filling strip (6) is wrapped around the outside of the neutral line (2) so that the wire diameter of the neutral line (2) is equal to the wire diameter of the three main core wires (1).

9. A multiphase composite cable according to claim 8, characterized in that: The expanded diameter filling strip (6) is provided with an embedding opening (6.1) for embedding the neutral line (2), the embedding opening (6.1) faces the axial direction of the body, and the two ends of the embedding opening (6.1) respectively abut against two adjacent main core lines (1).

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