Anti-interference composite shielded cable for signal transmission system

Abstract

The utility model relates to cable technical field, concretely is a kind of anti-interference composite shielded cable for signal transmission system. Including: corrosion-resistant outer covering layer;Woven mesh layer, set in the inside of corrosion-resistant outer covering layer;Aluminum foil shielding layer, set in the inside of woven mesh layer;Conductor layer, set in the inside of aluminum foil shielding layer, the outer periphery of conductor layer is covered with ferrite magnetic ring layer. Ferrite magnetic ring layer is nanocrystalline strip material winding aluminum foil shielding layer is double-layer aluminum foil shielding layer. Woven mesh layer is galvanized copper wire woven mesh. Corrosion-resistant outer covering layer is polytetrafluoroethylene material. Conductor layer is multiple galvanized copper wire. Woven mesh layer and aluminum foil shielding layer between inlay have magnesium strip, and magnesium strip and woven mesh layer and aluminum foil shielding layer electrically connected. Woven mesh layer is circular structure, and aluminum foil shielding layer is irregular shape, and magnesium strip is filled in the gap between woven mesh layer and aluminum foil shielding layer. Its anti-interference capacity is promoted, and service life is long.

Description

Technical Field

[0001] This utility model relates to the field of cable technology, specifically to an anti-interference composite shielded cable for signal transmission systems. Background Technology

[0002] In industrial automation control systems, 4-20mA analog signals are widely used in process control due to their strong anti-interference capabilities and long transmission distances. However, with the increasing popularity of high-power frequency converters (such as blower frequency converter cabinets and frequency converter drive systems), the 10-100kHz high-frequency harmonics generated during their operation can severely interfere with the transmission of nearby low-level analog signals, causing excessive signal fluctuations and even triggering malfunctions in the control system.

[0003] Furthermore, environmental factors in industrial settings (such as humidity and corrosive gases) accelerate the aging of signal transmission lines. For example, in industries like chemical engineering and wastewater treatment, underground cable trenches are exposed to high humidity or corrosive environments for extended periods, leading to oxidation of the cable shielding and deterioration of insulation performance. Operational data from a chemical wastewater treatment plant shows that after three years of operation, the signal failure rate due to shielding corrosion and insulation damage reached as high as 23%, increasing maintenance costs and potentially posing safety hazards. Utility Model Content

[0004] In order to solve the technical problems existing in the background art, this utility model provides an anti-interference composite shielded cable for signal transmission systems, which has improved anti-interference ability and extended service life.

[0005] The technical solution adopted by this utility model to solve its technical problem is: An anti-interference composite shielded cable for a signal transmission system, comprising: Corrosion-resistant outer coating; A woven mesh layer is placed on the inside of the corrosion-resistant outer layer; An aluminum foil shielding layer is disposed on the inner side of the woven mesh layer; A conductor layer is disposed inside the aluminum foil shielding layer, and a ferrite magnetic ring layer is wrapped around the outer periphery of the conductor layer.

[0006] Furthermore, the ferrite magnetic ring layer is made of nanocrystalline ribbon.

[0007] Furthermore, the aluminum foil shielding layer is a double-layer aluminum foil shielding layer.

[0008] Furthermore, the woven mesh layer is made of galvanized copper wire woven mesh.

[0009] Furthermore, the corrosion-resistant outer layer is made of polytetrafluoroethylene propylene.

[0010] Furthermore, the conductor layer is made of multi-strand tin-plated copper wire.

[0011] Furthermore, a magnesium strip is embedded between the woven mesh layer and the aluminum foil shielding layer, and the magnesium strip is electrically connected to the woven mesh layer and the aluminum foil shielding layer.

[0012] Furthermore, the woven mesh layer has a circular structure, the aluminum foil shielding layer has an irregular shape, and magnesium strips are filled in the gap between the woven mesh layer and the aluminum foil shielding layer.

[0013] The beneficial effects of this utility model are: (1) Integrating the ferrite magnetic ring layer into the structure of industrial signal cable improves the anti-interference ability of the cable and extends its service life.

[0014] (2) The inner aluminum foil shielding layer is designed to protect against low-frequency electromagnetic interference, while the outer braided mesh layer improves the shielding effect against high-frequency electromagnetic interference and the flexibility of the cable, resulting in better electromagnetic wave shielding coverage.

[0015] (3) Because magnesium has stronger metallic activity, it can actively act as a sacrificial anode, attracting and bearing the electrochemical corrosion that would otherwise corrode the braided mesh layer and aluminum foil shielding layer, thus significantly extending the service life of the shielded cable. Attached Figure Description

[0016] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0017] Figure 1 This is a structural schematic diagram of Embodiment 1 of the present utility model; Figure 2 This is a schematic diagram of the structure of Embodiment 2 of this utility model.

[0018] In the picture: 1. Conductor layer, 2. Ferrite magnetic ring layer, 3. Aluminum foil shielding layer, 4. Braided mesh layer, 5. Corrosion-resistant outer sheath layer, 6. Magnesium strip. Detailed Implementation

[0019] The present invention will be further described in detail below with reference to the accompanying drawings.

[0020] like Figure 1 As shown, an anti-interference composite shielded cable for a signal transmission system includes a corrosion-resistant outer sheath 5. A braided mesh layer 4 is disposed inside the corrosion-resistant outer sheath 5. An aluminum foil shielding layer 3 is disposed inside the braided mesh layer 4. A conductor layer 1 is disposed inside the aluminum foil shielding layer 3, and a ferrite magnetic ring layer 2 is wrapped around the outer periphery of the conductor layer 1. During cable laying, the bending radius must be ≥8 times the outer diameter to avoid breakage of the ferrite magnetic ring layer 2.

[0021] In a specific embodiment, conductor layer 1 is composed of multi-strand tin-plated copper wire with a cross-sectional area ≥ 0.5 mm². 2The inner aluminum foil shielding layer 2 is made of nanocrystalline ribbon with an initial permeability μi ≥ 5000, covering a frequency band of 10kHz-10MHz. The aluminum foil shielding layer 3 is a double-layer aluminum foil shielding layer with a coverage of ≥ 95%, suppressing high-frequency radiation interference. The braided mesh layer 4 is a galvanized copper wire braided mesh with a braiding density of ≥ 85%, enhancing low-frequency magnetic field shielding. The corrosion-resistant outer sheath layer 5 is made of polytetrafluoroethylene propylene (PTFE) material, which can also be replaced with PTFE or PFA depending on the corrosion level, with a thickness of 1.2±0.1mm, resistant to acid, alkali, and high-temperature environments. The inner aluminum foil shielding layer 3 targets low-frequency electromagnetic interference, while the outer braided mesh layer 4 improves the shielding effect against high-frequency electromagnetic interference and the cable's flexibility, resulting in superior electromagnetic wave shielding coverage.

[0022] This cable has improved anti-interference capabilities and a long service life. The signal fluctuation near the 30kW frequency converter has been reduced from ±8.7% to ±0.5%. After 5 years, the insulation resistance is >100MΩ.

[0023] like Figure 2 As shown, a magnesium strip 6 is embedded between the woven mesh layer 4 and the aluminum foil shielding layer 3, and the magnesium strip 6 is electrically connected to the woven mesh layer 4 and the aluminum foil shielding layer 3. In a specific embodiment, the woven mesh layer 4 has a circular structure, the aluminum foil shielding layer 3 has an irregular shape, and the magnesium strip 6 fills the gap between the woven mesh layer 4 and the aluminum foil shielding layer 3.

[0024] Because magnesium is more reactive, it can actively act as a sacrificial anode, attracting and bearing the electrochemical corrosion that would normally corrode the braided mesh layer 4 and the aluminum foil shielding layer 3. This significantly alleviates the corrosion of the braided mesh layer 4 and the aluminum foil shielding layer 3, thereby significantly extending the service life of the shielded cable. Furthermore, the irregularly shaped aluminum foil shielding layer 3 provides even better electromagnetic shielding.

[0025] Implementation Case: Sludge Dewatering Room of a Petrochemical Wastewater Treatment Plant 1. Installation and configuration: Transmission distance: 150 meters (including 30 meters of cable trench laying); Load equipment: 3 centrifuges (power 55kW, including frequency converter).

[0026] 2. Comparison of data: Average number of daily interferences 30 times 12 times Based on the above-described preferred embodiments of this utility model, and through the foregoing description, those skilled in the art can make various changes and modifications without departing from the technical concept of this utility model. The technical scope of this utility model is not limited to the contents of the specification, but must be determined according to the scope of the claims.

Claims

1. An anti-interference composite shielded cable for a signal transmission system, characterized in that, include: Corrosion-resistant outer coating (5); A woven mesh layer (4) is placed inside the corrosion-resistant outer layer (5); An aluminum foil shielding layer (3) is disposed on the inner side of the woven mesh layer (4); A conductor layer (1) is disposed inside the aluminum foil shielding layer (3), and a ferrite magnetic ring layer (2) is wrapped around the outer periphery of the conductor layer (1).

2. The anti-interference composite shielded cable for a signal transmission system according to claim 1, characterized in that: The ferrite magnetic ring layer (2) is made of nanocrystalline ribbon.

3. The anti-interference composite shielded cable for a signal transmission system according to claim 1, characterized in that: The aluminum foil shielding layer (3) is a double-layer aluminum foil shielding layer.

4. The anti-interference composite shielded cable for a signal transmission system according to claim 1, characterized in that: The woven mesh layer (4) is a galvanized copper wire woven mesh.

5. The anti-interference composite shielded cable for a signal transmission system according to claim 1, characterized in that: The corrosion-resistant outer layer (5) is made of polytetrafluoroethylene propylene.

6. The anti-interference composite shielded cable for a signal transmission system according to claim 1, characterized in that: The conductor layer (1) is a multi-strand tin-plated copper wire.

7. The anti-interference composite shielded cable for a signal transmission system according to claim 1, characterized in that: A magnesium strip (6) is embedded between the woven mesh layer (4) and the aluminum foil shielding layer (3), and the magnesium strip (6) is electrically connected to the woven mesh layer (4) and the aluminum foil shielding layer (3).

8. The anti-interference composite shielded cable for a signal transmission system according to claim 7, characterized in that: The woven mesh layer (4) has a circular structure, the aluminum foil shielding layer (3) has an irregular shape, and the magnesium strip (6) fills the gap between the woven mesh layer (4) and the aluminum foil shielding layer (3).

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