Anti-interference frequency conversion power cable

Abstract

The utility model discloses an anti-interference variable-frequency power cable, which relates to the technical field of variable-frequency power cables and comprises a cable core, the cable core is provided with a plurality of power wire cores and a plurality of grounding wire cores which are twisted together, and flame-retardant filling ropes are filled in twisting gaps of the cable core; each power wire core is provided with a power conductor, and a power insulating layer and a power shielding layer which are sequentially coated outside the power conductor from inside to outside; and the grounding wire core is provided with a grounding conductor, and a grounding insulating layer and a grounding shielding layer which are sequentially coated outside the grounding conductor from inside to outside. According to the utility model, the power shielding layer and the grounding shielding layer are respectively arranged for the power wire core and the grounding wire core, so that the anti-electromagnetic interference capability can be improved, and the stability and the reliability of signal transmission are ensured.

Description

Technical Field

[0001] The utility model relates to the technical field of variable frequency power cables, and in particular to an anti-interference variable frequency power cable. Background Art

[0002] Variable frequency power cables are specialized cables used to transmit variable frequency power. They are primarily used in power systems requiring frequency regulation, such as between inverters and motors. Because the output signal of a variable frequency power supply is in the form of high-frequency pulses, the corresponding cables must also possess excellent anti-interference capabilities and transmission stability.

[0003] The prior art discloses a variable-frequency low-voltage power cable suitable for use in high-electromagnetic interference and high-temperature environments. See the Chinese patent document titled "A Novel Anti-Electromagnetic Interference, Wear-Resistant, Rat-Proof, Ant-Resistant, High-Temperature, and Environmentally Friendly Variable-Frequency Low-Voltage Power Cable," with publication number CN219143862U and publication date June 6, 2023. This technology involves extruding the insulating sheath in phases, then symmetrically forming the cable into a cable. The wrapping tape, braided shielding layer, inner sheath, armor layer, and outer sheath are then sequentially applied. Electromagnetic shielding relies solely on a single layer of tinned copper braided shielding. This results in weak anti-interference capabilities in complex electromagnetic environments, leading to poor transmission performance. Utility Model Content

[0004] The utility model provides an anti-interference variable frequency power cable, in order to solve the technical problem that the cable in the prior art has poor anti-electromagnetic interference capability.

[0005] The technical solutions adopted in this utility model are as follows:

[0006] An anti-interference variable frequency power cable comprises a cable core having a plurality of power wire cores and a plurality of ground wire cores twisted together, wherein the twisted gaps of the cable core are filled with flame-retardant filling ropes;

[0007] The power core has a power conductor, and a power insulation layer and a power shielding layer sequentially covering the outside of the power conductor from the inside out;

[0008] The grounding core comprises a grounding conductor, and a grounding insulation layer and a grounding shielding layer which are sequentially coated on the outside of the grounding conductor from the inside out.

[0009] The above technical measures can improve the anti-electromagnetic interference capability and ensure the stability and reliability of signal transmission by providing a power shielding layer and a grounding shielding layer for the power core and the grounding core respectively.

[0010] Furthermore, the power core also has a power mica tape wrapping layer located inside the power insulation layer;

[0011] The power mica tape wrapping layer is a mica tape with a thickness of 0.15 mm and a width of 15 to 60 mm, which is wrapped around the outside of the power conductor in an overlapping manner;

[0012] The power conductor is a multiple-twisted structure of several tinned copper wires with a single wire diameter of 0.1 to 0.5 mm;

[0013] The power insulation layer is an extruded structure of flame-retardant cross-linked polyethylene material on the outside of the power mica tape wrapping layer, and the extruded thickness is 0.7-1.8 mm.

[0014] The above technical measures improve the fire resistance by arranging a power mica tape wrapping layer on the inner side of the power insulation layer; the power conductor adopts a double-twisted structure, which increases the flexibility of the power conductor; the power insulation layer is made of flame-retardant cross-linked polyethylene material and has an extruded structure, which improves the fire resistance.

[0015] Furthermore, the power shielding layer is a woven structure of tinned copper wires with a diameter of 0.15 to 0.30 mm outside the power insulating layer, with a weaving density of ≥80%.

[0016] In the above technical measures, the power shielding layer adopts a tinned copper wire braided structure with a braiding density of ≥80%, which can enhance the ability to resist electromagnetic interference.

[0017] Furthermore, the grounding core further comprises a grounding mica tape wrapping layer located inside the grounding insulation layer;

[0018] The grounding mica tape wrapping layer is a mica tape with a thickness of 0.15 mm and a width of 15 to 60 mm, which is wrapped around the outside of the grounding conductor in an overlapping manner;

[0019] The grounding conductor is a multiple twisted structure of several tinned copper wires with a single wire diameter of 0.1 to 0.5 mm;

[0020] The grounding insulation layer is an extruded structure of flame-retardant cross-linked polyethylene material on the outside of the grounding mica tape wrapping layer, and the extruded thickness is 0.7-1.0 mm.

[0021] The above technical measures improve the fire resistance by arranging a grounding mica tape wrapping layer on the inner side of the grounding insulation layer; the grounding conductor adopts a twisted structure, which increases the flexibility of the grounding conductor; the grounding insulation layer is made of flame-retardant cross-linked polyethylene material and has an extruded structure, which improves the fire resistance.

[0022] Furthermore, the ground shielding layer is a braided structure of tinned copper wires with a diameter of 0.15 to 0.30 mm outside the ground insulation layer, with a braiding density of ≥80%.

[0023] In the above technical measures, the grounding shielding layer adopts a tinned copper wire braided structure with a braiding density of ≥80%, which can enhance the ability to resist electromagnetic interference.

[0024] Furthermore, the cable core is coated with a low-smoke halogen-free flame retardant tape wrapping layer, a general shielding layer, an inner sheath layer, an armor layer and an outer sheath layer in sequence from the inside to the outside;

[0025] The overall shielding layer comprises an inner copper wire braided shielding layer and an outer copper tape wrapped shielding layer;

[0026] The copper wire braided shielding layer is a braided structure of copper wires with a diameter of 0.15 to 0.30 mm wrapped around the outside of the low-smoke halogen-free flame retardant tape, with a braiding density of ≥90%;

[0027] The copper tape wrapped shielding layer is a structure in which copper tape with a thickness of 0.1 mm and a width of 25 to 50 mm is overlapped and wrapped outside the copper wire braided shielding layer.

[0028] The above technical measures can reduce external electromagnetic interference by providing two shielding layers, and at the same time can enhance mechanical strength by wrapping the shielding layer with copper tape.

[0029] Furthermore, the inner sheath layer is an extruded structure of flame-retardant polyvinyl chloride material;

[0030] The inner sheath layer has an extruded thickness of 1.0 to 1.8 mm.

[0031] The above technical measures can improve the flame retardancy by providing the inner sheath layer with an extruded structure of flame retardant polyvinyl chloride material, and can enhance the insulation performance through the extruded structure.

[0032] Furthermore, the armor layer is a structure in which at least one layer of galvanized steel strip with a thickness of 0.2 to 0.8 mm and a width of 30 to 60 mm is wrapped around the outer surface of the inner sheath layer;

[0033] The overlapping rate of each layer of wrapping is ≥55%.

[0034] The above technical measures enhance the mechanical strength of the cable and its ability to resist electromagnetic interference by designing the armor layer as an overlapping wrapped structure of galvanized steel strips with an overlap rate of ≥55%.

[0035] Furthermore, the exterior of the outer sheath layer is coated with a fire retardant coating.

[0036] The above technical measures can improve the flame retardant performance by applying a fire retardant coating on the outside of the outer sheath layer.

[0037] Furthermore, the outer sheath layer is an extruded structure of low-smoke halogen-free flame-retardant polyethylene material.

[0038] The above technical measures can improve the flame retardant performance by setting the outer sheath layer to an extruded structure of low-smoke halogen-free flame retardant polyethylene material, and can enhance the insulation performance through the extruded structure.

[0039] One or more technical solutions provided by this utility model have at least the following technical effects or advantages:

[0040] The utility model can improve the anti-electromagnetic interference capability and ensure the stability and reliability of signal transmission by respectively arranging a power shielding layer and a grounding shielding layer for the power line core and the grounding line core.

[0041] By providing a copper wire braided shielding layer and a copper tape wrapped shielding layer, the cable's anti-electromagnetic interference capability and mechanical strength are further enhanced.

[0042] By applying a fire-retardant coating on the outer sheath layer, the flame retardant performance of the cable can be improved, which helps reduce damage to the cable caused by external environmental factors. BRIEF DESCRIPTION OF THE DRAWINGS

[0043] The drawings described herein are used to provide a further understanding of the embodiments of the present invention, constitute a part of the present invention, and do not constitute a limitation of the embodiments of the present invention;

[0044] Figure 1 It is a structural diagram of the utility model;

[0045] Among them, 1-power core; 11-power conductor; 12-power mica tape wrapping layer; 13-power insulation layer; 14-power shielding layer; 2-grounding core; 21-grounding conductor; 22-grounding mica tape wrapping layer; 23-grounding insulation layer; 24-grounding shielding layer; 3-low-smoke halogen-free flame retardant tape wrapping layer; 4-total shielding layer; 41-copper wire braided shielding layer; 42-copper tape wrapped shielding layer; 5-inner sheath layer; 6-armor layer; 7-outer sheath layer; 8-fire retardant coating; 9-flame retardant filling rope. DETAILED DESCRIPTION

[0046] In order to more clearly understand the above-mentioned objects, features and advantages of the present invention, the present invention is further described in detail below with reference to the accompanying drawings and specific embodiments. It should be noted that the embodiments of the present invention and the features therein can be combined with each other without conflict.

[0047] In the following description, many specific details are set forth to facilitate a full understanding of the present invention. However, the present invention may also be implemented in other ways different from those described herein. Therefore, the scope of protection of the present invention is not limited to the specific embodiments disclosed below.

[0048] Example 1

[0049] Reference Figure 1This embodiment provides an anti-interference variable frequency power cable, including a cable core, the cable core having a plurality of power cores 1 and a plurality of grounding cores 2 twisted together, and the twisted gaps of the cable core are filled with a flame-retardant filling rope 9; the power core 1 has a power conductor 11, and a power insulation layer 13 and a power shielding layer 14 sequentially wrapped around the outside of the power conductor 11 from the inside out; the grounding core 2 has a grounding conductor 21, and a grounding insulation layer 23 and a grounding shielding layer 24 sequentially wrapped around the outside of the grounding conductor 21 from the inside out.

[0050] The cable core comprises three power cores 1 and three ground cores 2, which are symmetrically twisted in a herringbone pattern. The power conductor 11 and the ground conductor 21 are both Type 6 soft copper conductors specified in standard GB / T3956.

[0051] The power core 1 also has a power mica tape wrapping layer 12 located inside the power insulation layer 13; the power mica tape wrapping layer 12 is an overlapping wrapping structure of mica tape with a thickness of 0.15 mm and a width of 15 mm on the outside of the power conductor 11;

[0052] The power conductor 11 is a twisted structure of several tinned copper wires with a single wire diameter of 0.1 mm;

[0053] The power insulation layer 13 is an extruded structure of flame-retardant cross-linked polyethylene material on the outside of the power mica tape wrapping layer 12, and the extruded thickness is 0.7 mm.

[0054] The power shielding layer 14 is a braided structure of tinned copper wires with a diameter of 0.15 mm outside the power insulating layer 13, with a braiding density of 80%.

[0055] The grounding core 2 also has a grounding mica tape wrapping layer 22 located inside the grounding insulation layer 23. The grounding mica tape wrapping layer 22 is an overlapping wrapping structure of mica tape with a thickness of 0.15 mm and a width of 15 mm wrapped around the outside of the grounding conductor 21.

[0056] The ground conductor 21 is a twisted structure of several tinned copper wires with a single wire diameter of 0.1 mm;

[0057] The grounding insulation layer 23 is an extruded structure of flame-retardant cross-linked polyethylene material on the outside of the grounding mica tape wrapping layer 22, with a thickness of 0.7 mm.

[0058] The ground shielding layer 24 is a braided structure of tinned copper wires with a diameter of 0.15 mm outside the ground insulating layer 23, with a braiding density of 80%.

[0059] The cable core is covered with a low-smoke halogen-free flame-retardant tape wrapping layer 3, a general shielding layer 4, an inner sheath layer 5, an armor layer 6 and an outer sheath layer 7 in sequence from the inside to the outside;

[0060] The overall shielding layer 4 comprises an inner copper wire braided shielding layer 41 and an outer copper tape wrapped shielding layer 42; the copper wire braided shielding layer 41 is a braided structure of copper wires with a diameter of 0.15 mm woven around the outer surface of the low-smoke halogen-free flame-retardant tape wrapped layer 3, with a braiding density of 90%;

[0061] The copper tape wrapped shielding layer 42 is a structure in which copper tape with a thickness of 0.1 mm and a width of 25 mm is wrapped around the copper wire braided shielding layer 41 in an overlapping manner; the average overlap rate is 30% and the minimum overlap rate is 15%.

[0062] The inner sheath layer 5 is an extruded structure of flame-retardant polyvinyl chloride material; the extruded thickness of the inner sheath layer 5 is 1.0 mm.

[0063] The armor layer 6 is a layer of overlapping wrapped structure of galvanized steel strip with a thickness of 0.2 mm and a width of 30 mm on the outside of the inner sheath layer 5; the overlap rate of each layer of overlapping wrapping is 55%.

[0064] The exterior of the outer sheath layer 7 is coated with a fire retardant coating 8 .

[0065] The outer sheath layer 7 is an extruded structure of low-smoke halogen-free flame-retardant polyethylene material.

[0066] Example 2

[0067] The rest of this embodiment is the same as that of embodiment 1, except that:

[0068] The power core 1 also has a power mica tape wrapping layer 12 located inside the power insulation layer 13; the power mica tape wrapping layer 12 is an overlapping wrapping structure of mica tape with a thickness of 0.15 mm and a width of 60 mm on the outside of the power conductor 11;

[0069] The power conductor 11 is a twisted structure of several tinned copper wires with a single wire diameter of 0.5 mm;

[0070] The power insulation layer 13 is an extruded structure of flame-retardant cross-linked polyethylene material on the outside of the power mica tape wrapping layer 12, and the extruded thickness is 1.8 mm.

[0071] The power shielding layer 14 is a braided structure of tinned copper wires with a diameter of 0.30 mm outside the power insulating layer 13, with a braiding density of 85%.

[0072] The grounding core 2 also has a grounding mica tape wrapping layer 22 located inside the grounding insulation layer 23. The grounding mica tape wrapping layer 22 is an overlapping wrapping structure of mica tape with a thickness of 0.15 mm and a width of 60 mm wrapped around the outside of the grounding conductor 21.

[0073] The ground conductor 21 is a twisted structure of several tinned copper wires with a single wire diameter of 0.5 mm;

[0074] The grounding insulation layer 23 is an extruded structure of flame-retardant cross-linked polyethylene material on the outside of the grounding mica tape wrapping layer 22, with a thickness of 1.0 mm.

[0075] The ground shielding layer 24 is a braided structure of tinned copper wires with a diameter of 0.30 mm outside the ground insulating layer 23, with a braiding density of 85%.

[0076] The cable core is covered with a low-smoke halogen-free flame-retardant tape wrapping layer 3, a general shielding layer 4, an inner sheath layer 5, an armor layer 6 and an outer sheath layer 7 in sequence from the inside to the outside;

[0077] The overall shielding layer 4 comprises an inner copper wire braided shielding layer 41 and an outer copper tape wrapped shielding layer 42; the copper wire braided shielding layer 41 is a braided structure of copper wires with a diameter of 0.30 mm woven around the outer surface of the low-smoke halogen-free flame-retardant tape wrapped layer 3, with a braiding density of 92%;

[0078] The copper tape wrapped shielding layer 42 is a structure in which copper tape with a thickness of 0.1 mm and a width of 50 mm is wrapped around the copper wire braided shielding layer 41 in an overlapping manner; the average overlap rate is 40% and the minimum overlap rate is 20%.

[0079] The inner sheath layer 5 is an extruded structure of flame-retardant polyvinyl chloride material; the extruded thickness of the inner sheath layer 5 is 1.8 mm.

[0080] The armor layer 6 is a two-layer overlapping structure of galvanized steel strips with a thickness of 0.8 mm and a width of 60 mm wrapped around the outer surface of the inner sheath layer 5; the overlap rate of each layer is 60%.

[0081] Example 3

[0082] The rest of this embodiment is the same as that of embodiment 1, except that:

[0083] The power core 1 also has a power mica tape wrapping layer 12 located inside the power insulation layer 13; the power mica tape wrapping layer 12 is an overlapping wrapping structure of mica tape with a thickness of 0.15 mm and a width of 40 mm on the outside of the power conductor 11;

[0084] The power conductor 11 is a twisted structure of several tinned copper wires with a single wire diameter of 0.3 mm;

[0085] The power insulation layer 13 is an extruded structure of flame-retardant cross-linked polyethylene material on the outside of the power mica tape wrapping layer 12, and the extruded thickness is 1.4 mm.

[0086] The power shielding layer 14 is a braided structure of tinned copper wires with a diameter of 0.25 mm outside the power insulating layer 13, with a braiding density of 90%.

[0087] The grounding core 2 also has a grounding mica tape wrapping layer 22 located inside the grounding insulation layer 23. The grounding mica tape wrapping layer 22 is an overlapping wrapping structure of mica tape with a thickness of 0.15 mm and a width of 40 mm wrapped around the outside of the grounding conductor 21.

[0088] The grounding conductor 21 is a twisted structure of several tinned copper wires with a single wire diameter of 0.3 mm;

[0089] The grounding insulation layer 23 is an extruded structure of flame-retardant cross-linked polyethylene material on the outside of the grounding mica tape wrapping layer 22, with a thickness of 0.8 mm.

[0090] The ground shielding layer 24 is a braided structure of tinned copper wires with a diameter of 0.20 mm outside the ground insulating layer 23, with a braiding density of 90%.

[0091] The cable core is covered with a low-smoke halogen-free flame-retardant tape wrapping layer 3, a general shielding layer 4, an inner sheath layer 5, an armor layer 6 and an outer sheath layer 7 in sequence from the inside to the outside;

[0092] The overall shielding layer 4 comprises an inner copper wire braided shielding layer 41 and an outer copper tape wrapped shielding layer 42; the copper wire braided shielding layer 41 is a braided structure of copper wires with a diameter of 0.20 mm woven around the outer surface of the low-smoke halogen-free flame-retardant tape wrapped layer 3, with a braiding density of 91%.

[0093] The copper tape wrapped shielding layer 42 is a structure in which copper tape with a thickness of 0.1 mm and a width of 35 mm is overlapped and wrapped around the outside of the copper wire braided shielding layer 41; the average overlap rate is 35% and the minimum overlap rate is 18%.

[0094] The inner sheath layer 5 is an extruded structure of flame-retardant polyvinyl chloride material; the thickness of the inner sheath layer 5 is 1.5 mm.

[0095] The armor layer 6 is a three-layer overlapping structure of galvanized steel strips with a thickness of 0.5 mm and a width of 45 mm wrapped around the outer surface of the inner sheath layer 5; the overlap rate of each layer is 63%.

[0096] Although the preferred embodiments of the present invention have been described, those skilled in the art may make additional changes and modifications to these embodiments once they have learned the basic creative concept. Therefore, the appended claims are intended to be interpreted as including the preferred embodiments and all changes and modifications that fall within the scope of the present invention.

[0097] Obviously, those skilled in the art may make various modifications and variations to the present invention without departing from the spirit and scope of the present invention. Thus, if such modifications and variations fall within the scope of the claims of the present invention and their equivalents, the present invention is intended to include such modifications and variations.

Claims

1. An anti-interference variable frequency power cable, comprising a cable core, wherein the cable core has a plurality of power cores (1) and a plurality of ground cores (2) twisted together, and the twisted gaps of the cable core are filled with a flame retardant filling rope (9); Its characteristics are: The power core (1) comprises a power conductor (11), and a power mica tape wrapping layer (12), a power insulation layer (13), and a power shielding layer (14) sequentially wrapped around the outside of the power conductor (11) from the inside out, wherein the power mica tape wrapping layer (12) is a mica tape with a thickness of 0.15 mm and a width of 15 to 60 mm, which is an overlapping wrapping structure around the outside of the power conductor (11); The grounding core (2) comprises a grounding conductor (21), and a grounding mica tape wrapping layer (22), a grounding insulation layer (23), and a grounding shielding layer (24) sequentially wrapped around the outside of the grounding conductor (21) from the inside out, wherein the grounding mica tape wrapping layer (22) is a mica tape with a thickness of 0.15 mm and a width of 15 to 60 mm, which is an overlapping wrapping structure around the outside of the grounding conductor (21); The exterior of the cable core is sequentially coated with a low-smoke halogen-free flame-retardant tape wrapping layer (3), a general shielding layer (4), an inner sheath layer (5), an armor layer (6), and an outer sheath layer (7) from the inside out; The overall shielding layer (4) comprises an inner copper wire braided shielding layer (41) and an outer copper tape wrapped shielding layer (42); the copper wire braided shielding layer (41) is a braided structure of copper wires with a diameter of 0.15 to 0.30 mm on the outside of the low-smoke halogen-free flame-retardant tape wrapped layer (3), with a braiding density of ≥90%; the copper tape wrapped shielding layer (42) is an overlapping wrapped structure of copper tapes with a thickness of 0.1 mm and a width of 25 to 50 mm on the outside of the copper wire braided shielding layer (41); The inner sheath layer (5) is an extruded structure of a flame-retardant polyvinyl chloride material, and the extruded thickness of the inner sheath layer (5) is 1.0 to 1.8 mm; The armor layer (6) is a galvanized steel strip with a thickness of 0.2 to 0.8 mm and a width of 30 to 60 mm, which is at least one layer of overlapping wrapping structure outside the inner sheath layer (5), and the overlap rate of each layer of overlapping wrapping is ≥55%; The outer sheath layer (7) is an extruded structure of a low-smoke, halogen-free, flame-retardant polyethylene material, and the exterior of the outer sheath layer (7) is coated with a fireproof coating (8).

2. The anti-interference frequency conversion power cable according to claim 1, characterized in that: The power conductor (11) is a twisted structure of a plurality of tinned copper wires with a single wire diameter of 0.1 to 0.5 mm; The power insulation layer (13) is an extruded structure of flame-retardant cross-linked polyethylene material outside the power mica tape wrapping layer (12), and the extruded thickness is 0.7-1.8 mm.

3. The anti-interference variable frequency power cable according to claim 1, characterized in that: The power shielding layer (14) is a braided structure of tinned copper wires with a diameter of 0.15 to 0.30 mm outside the power insulating layer (13), with a braiding density of ≥80%.

4. The anti-interference variable frequency power cable according to claim 1, characterized in that: The grounding conductor (21) is a twisted structure of a plurality of tinned copper wires with a single wire diameter of 0.1 to 0.5 mm; The grounding insulation layer (23) is an extruded structure of flame-retardant cross-linked polyethylene material outside the grounding mica tape wrapping layer (22), and the extruded thickness is 0.7-1.0 mm.

5. The anti-interference variable frequency power cable according to claim 1, characterized in that: The grounding shielding layer (24) is a braided structure of tinned copper wires with a diameter of 0.15 to 0.30 mm outside the grounding insulating layer (23), with a braiding density of ≥80%.

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