High-temperature-resistant low-loss variable frequency cable

Abstract

The utility model discloses a kind of high-temperature-resistant low-loss variable frequency cable, it is related to wire and cable technical field, high-temperature-resistant performance is good, strong anti-interference ability, conductor loss is low, long service life. Including sheath, the sheath is equipped with conductor, the conductor includes three power lines and three ground wires, three the power line and three the ground wire are symmetric star-shaped arrangement, the outside of the power line and the ground wire is equipped with insulating layer, wrapping layer, shielding layer and isolation layer in sequence, the shielding layer uses double-layer composite shielding, including inner shielding layer and outer shielding layer.

Description

Technical Field

[0001] This utility model relates to the field of wire and cable technology, specifically to a high-temperature resistant, low-loss frequency conversion cable. Background Technology

[0002] Variable frequency cables are mainly used for connecting variable frequency power supplies and variable frequency motors, as well as for transmitting electrical energy in power transmission and distribution lines with a rated voltage of 1KV and below. They are particularly suitable for industries such as papermaking, metallurgy, metal processing, mining, railways, and food processing. The structure of a variable frequency cable includes three main insulated wires and three neutral insulated wires, forming a 3+3 core structure. This gives the cable strong resistance to voltage surges and allows it to withstand the pulse voltages during high-speed, frequent frequency conversions, providing excellent protection for variable frequency electrical appliances.

[0003] For example, Chinese patent CN222462406U discloses a low-smoke halogen-free frequency converter cable, including a conductor core. A first conductive component is fixedly connected to the surface of the conductor core, an insulating layer is fixedly connected to the surface of the first conductive component, a first partition is fixedly connected to the surface of the insulating layer, and a second conductive component is fixedly connected to the surface of the first partition. This invention, through the arrangement of the shielding component, the first protective component, and the second protective component, can suppress the external emission of electromagnetic waves by utilizing the cooperation between the metal shielding layer, the isolation layer, and the oxygen barrier layer during use. It can also serve as a channel for short-circuit current, thus protecting the conductor core. The cooperation between the filling layer, the inner sheath, the metal armor, the metal sheath layer, the fire-resistant layer, and the outer sheath improves the overall structural stability of the device and makes it less prone to damage, thereby enhancing the practicality of the device.

[0004] However, frequency conversion cables are mainly used in applications that require adjustable frequency, such as frequency converters and motor control systems. This requires them to have excellent high temperature resistance. At the same time, frequency conversion cables also need to have low loss characteristics to meet environmental protection requirements. Therefore, we propose a high temperature resistant and low loss frequency conversion cable. Utility Model Content

[0005] The technical problem to be solved by this utility model is to overcome the defects of the existing technology and provide a high-temperature resistant, low-loss frequency conversion cable with good high-temperature resistance, strong anti-interference ability, low conductor loss, and long service life.

[0006] To solve the above-mentioned technical problems, the technical solution of this utility model is: a high-temperature resistant, low-loss frequency conversion cable, including a sheath, a conductor inside the sheath, the conductor including three power lines and three grounding lines, the three power lines and the three grounding lines being arranged in a symmetrical star shape, and an insulation layer, a wrapping layer, a shielding layer and an isolation layer being provided on the outside of the power lines and the grounding lines in sequence, the shielding layer adopting a double-layer composite shielding, including an inner shielding layer and an outer shielding layer.

[0007] Furthermore, the conductor is made of high-purity oxygen-free copper.

[0008] Furthermore, the insulating layer is made of cross-linked silicone rubber.

[0009] Furthermore, the wrapping layer is formed by wrapping with a double-layer composite mica tape.

[0010] Furthermore, the inner shielding layer is made of woven copper wire with a coverage of ≥80%.

[0011] Furthermore, the outer shielding layer is made of aluminum-plastic composite tape wrapped around it.

[0012] Furthermore, the isolation layer is a semi-conductive resistive water strip.

[0013] Furthermore, the sheath is also provided with a filler, which is a high-temperature resistant tape or a halogen-free tape.

[0014] Furthermore, the sheath is made of ceramicized silicone rubber.

[0015] By adopting the above technical solution, this utility model has the following beneficial effects: the conductor uses high-purity oxygen-free copper to reduce resistivity and thus reduce conductor loss. Simultaneously, tin or silver plating on its surface enhances oxidation resistance and high-frequency conductivity. The conductor uses 0.1-0.2mm fine copper wire stranded in layers to increase surface area, suppressing the skin effect and reducing high-frequency loss. The three power lines and three grounding lines are arranged symmetrically in a star shape to reduce electromagnetic interference. The combination of filler, insulation layer, wrapping layer, and sheath layer, along with multiple layers of heat-resistant materials, results in good high-temperature resistance and extended service life. The isolation layer is a semi-conductive resistive water tape, which prevents moisture penetration and balances the electric field. The double-layer composite shielding design ensures that the cable's shielding effectiveness in the 30MHz-1GHz frequency band is ≥70dB, providing strong anti-interference capabilities and further reducing losses. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the high-temperature resistant, low-loss frequency conversion cable of this utility model.

[0017] Figure 2 This is a schematic diagram of the conductor structure of this utility model.

[0018] Reference numerals: 1. Sheath; 2. Conductor; 3. Insulating layer; 4. Wrapping layer; 5. Shielding layer; 6. Isolating layer;

[0019] 11. Filler; 21. Power line; 22. Grounding wire; 51. Inner shielding layer; 52. Outer shielding layer. Detailed Implementation

[0020] To make the content of this utility model easier to understand, the present utility model will be further described in detail below with reference to specific embodiments and accompanying drawings.

[0021] like Figure 1-2 As shown, in this embodiment, a high-temperature resistant, low-loss frequency conversion cable is provided, including a sheath 1. The sheath 1 is provided with a conductor 2. The conductor 2 includes three power lines 21 and three grounding lines 22. The three power lines 21 and the three grounding lines 22 are arranged in a symmetrical star shape. The outside of the power lines 21 and the grounding lines 22 are provided with an insulation layer 3, a wrapping layer 4, a shielding layer 5 and an isolation layer 6 in sequence. The shielding layer 5 adopts a double-layer composite shielding, including an inner shielding layer 51 and an outer shielding layer 52.

[0022] In this embodiment, conductor 2 is made of high-purity oxygen-free copper to reduce resistivity and thus reduce conductor 2 loss. At the same time, tin or silver plating is applied to its surface to improve oxidation resistance and high-frequency conductivity. Conductor 2 is made of 0.1-0.2mm fine copper wire stranded in layers to increase surface area to suppress skin effect and reduce high-frequency loss. The three power lines 21 and the three ground lines 22 are arranged in a symmetrical star shape to reduce electromagnetic interference.

[0023] In this embodiment, the insulating layer 3 is made of cross-linked silicone rubber with a temperature resistance rating of -60℃ to +180℃, excellent heat resistance and aging resistance, low dielectric loss at high frequencies, and a thickness of ≥0.8mm.

[0024] In this embodiment, the wrapping layer 4 is made of double-layer composite mica tape, which can withstand temperatures up to 800℃, enhance the cable's fire resistance and high temperature resistance, and provide a certain degree of mechanical protection.

[0025] In this embodiment, the inner shielding layer 51 is a mesh structure woven from copper wires with a coverage of ≥80%, which can suppress internal electromagnetic interference. The outer shielding layer 52 is wrapped with aluminum-plastic composite tape to enhance the ability to resist external interference. The double-layer composite shielding design makes the cable shielding effectiveness ≥70dB in the 30MHz-1GHz frequency band, with strong anti-interference ability, thereby reducing losses.

[0026] In this embodiment, the isolation layer 6 is a semi-conductive resistive water strip, which can prevent water penetration and balance the electric field.

[0027] In this embodiment, the sheath 1 is also provided with a filler 11, which is a high-temperature resistant tape or a halogen-free tape. While improving the high-temperature resistance of the cable, it can also improve the tensile strength. The filler 11 plays a role in fixing the wire core and preventing deformation, and can delay heat transfer at high temperatures.

[0028] In this embodiment, the material of the sheath 1 is ceramicized silicone rubber, which has a temperature resistance of up to 200°C. After combustion, it forms a ceramic layer, which has both flame retardant and high temperature resistance properties. The thickness of the sheath 1 is ≥1.5mm and the tensile strength is ≥10MPa.

[0029] The high-temperature resistant, low-loss frequency conversion cable provided by this utility model has the following advantages: the conductor 2 is made of high-purity oxygen-free copper, which reduces resistivity and thus reduces conductor 2 loss. At the same time, tin or silver plating is applied to its surface to improve oxidation resistance and high-frequency conductivity. The conductor 2 is made of 0.1-0.2mm fine copper wire stranded in layers to increase surface area and suppress skin effect, thereby reducing high-frequency loss. The three power lines 21 and three grounding lines 22 are arranged in a symmetrical star shape to reduce electromagnetic interference. The filler 11, insulation layer 3, wrapping layer 4, and sheath 1 are combined in a multi-layer heat-resistant material combination, which makes the cable have good high-temperature resistance and improves service life. The isolation layer 6 is a semi-conductive resistive water tape, which can prevent moisture penetration and balance the electric field. The double-layer composite shielding design makes the cable shielding effectiveness ≥70dB in the 30MHz-1GHz frequency band, with strong anti-interference ability, thereby reducing loss.

[0030] The specific embodiments described above further illustrate the technical problems, technical solutions, and beneficial effects of this utility model. It should be understood that the above descriptions are merely specific embodiments of this utility model and are not intended to limit this utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A high-temperature resistant, low-loss frequency conversion cable, characterized in that: Includes a sheath (1), inside which is a conductor (2), the conductor (2) includes three power lines (21) and three grounding lines (22), the three power lines (21) and the three grounding lines (22) are arranged in a symmetrical star shape, and the outside of the power lines (21) and the grounding lines (22) are provided with an insulation layer (3), a wrapping layer (4), a shielding layer (5) and an isolation layer (6) in sequence, the shielding layer (5) adopts a double-layer composite shielding, including an inner shielding layer (51) and an outer shielding layer (52).

2. The high-temperature resistant, low-loss frequency conversion cable according to claim 1, characterized in that: The conductor (2) is made of high-purity oxygen-free copper.

3. The high-temperature resistant, low-loss frequency conversion cable according to claim 1, characterized in that: The insulating layer (3) is made of cross-linked silicone rubber.

4. The high-temperature resistant, low-loss frequency conversion cable according to claim 1, characterized in that: The wrapping layer (4) is formed by wrapping a double-layer composite mica tape.

5. The high-temperature resistant, low-loss frequency conversion cable according to claim 1, characterized in that: The inner shielding layer (51) is made of copper wire braid and has a coverage of ≥80%.

6. The high-temperature resistant, low-loss frequency conversion cable according to claim 1, characterized in that: The outer shielding layer (52) is made of aluminum-plastic composite tape wrapped longitudinally.

7. The high-temperature resistant, low-loss frequency conversion cable according to claim 1, characterized in that: The isolation layer (6) is a semi-conductive resistive water strip.

8. The high-temperature resistant, low-loss frequency conversion cable according to claim 1, characterized in that: The sheath (1) is further provided with a filler (11), which is a high-temperature resistant tape or a halogen-free tape.

9. The high-temperature resistant, low-loss frequency conversion cable according to claim 1, characterized in that: The sheath (1) is made of ceramicized silicone rubber.

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