High-temperature-resistant low-loss long-life environment-friendly low-voltage variable frequency cable

Abstract

The utility model relates to the field of variable frequency cables, in particular to a high-temperature-resistant low-loss long-life environment-friendly low-voltage variable frequency cable which comprises a protective layer, three main line insulated wires and three zero line insulated wires, and the three main line insulated wires and the three zero line insulated wires are arranged in the protective layer. The protection layer comprises a filling layer, a high-temperature-resistant particle layer, a cabling wrapping tape layer, a shielding layer and a wrapping layer which are sequentially arranged from inside to outside; the cabling belting layer adopts a glass fiber low-smoke halogen-free fiber belt, the high-temperature-resistant particle layer adopts boron carbide particles, and the boron carbide particles are coated on the inner surface of the glass fiber low-smoke halogen-free fiber belt. According to the invention, the frequency conversion cable can operate continuously and effectively when a fire occurs.

Description

Technical Field

[0001] This application relates to the field of frequency conversion cables, and in particular to a high-temperature resistant, low-loss, long-life, environmentally friendly low-voltage frequency conversion cable. Background Technology

[0002] The structure of a frequency conversion cable includes three main insulated wires and three neutral insulated wires. An inner sheath, a copper tape layer, an outer sheath, and an outer protective layer are sequentially arranged outside the main insulated wires and the neutral insulated wires to form a 3+3 core structure. This gives the cable strong resistance to voltage surges and enables it to withstand the pulse voltage during high-speed and frequent frequency conversion, thus providing good protection for frequency conversion electrical appliances.

[0003] Variable frequency cables are used in power transmission and distribution lines to transmit electrical energy, and are particularly suitable for industries such as papermaking, metallurgy, metal processing, mining, railways, and food processing. In the event of a fire in an area where variable frequency cables are used, the fire can easily cause the cables to burn, making it difficult to ensure their continued effective operation. Utility Model Content

[0004] To help frequency converter cables continue to operate effectively in the event of a fire, this application provides a high-temperature resistant, low-loss, long-life, environmentally friendly low-voltage frequency converter cable.

[0005] This application provides a high-temperature resistant, low-loss, long-life, environmentally friendly low-voltage frequency conversion cable, which adopts the following technical solution:

[0006] A high-temperature resistant, low-loss, long-life, environmentally friendly low-voltage frequency conversion cable includes a protective layer, three main insulated wires and three neutral insulated wires disposed within the protective layer;

[0007] The protective layer comprises, from the inside out, a filling layer, a high-temperature resistant particle layer, a cabling wrapping layer, a shielding layer, and a wrapping layer;

[0008] The cabling wrapping layer is made of glass fiber low smoke halogen-free fiber tape, and the high temperature resistant particle layer is made of boron carbide particles, which are coated on the inner surface of the glass fiber low smoke halogen-free fiber tape.

[0009] By adopting the above technical solutions, the filling layer can fill the gaps between the three main insulated wires and the three neutral insulated wires; the cabling wrapping layer can wrap the three main insulated wires and the three neutral insulated wires into a single frequency converter cable; and the high-temperature resistant particle layer can enhance the fire resistance of the frequency converter cable. The shielding layer can increase the anti-interference capability of the frequency converter cable, and the wrapping layer can cover the shielding layer. In the event of a fire, the glass fiber low-smoke halogen-free fiber tape has high-temperature resistance and burns without halogens, and can support the boron carbide particles. The boron carbide particles can block the flames, thereby providing fire protection for the internal filling layer and the three main insulated wires and three neutral insulated wires within the filling layer. This prevents the flames from affecting the transmission point, thus helping the frequency converter cable to continue to operate effectively in the event of a fire.

[0010] Optionally, the main insulated wire includes a main conductor core, a main conductor core insulation layer disposed on the main conductor core from the inside out, a first shielding layer, and a wrapping tape layer.

[0011] By adopting the above technical solution, the main conductor insulation layer can increase the insulation effect between the main conductor and the secondary conductor. The first shielding layer can improve the anti-interference ability between the conductors. The wrapping layer can prevent the possibility of open circuit between the main conductor and the secondary conductor.

[0012] Optionally, the neutral wire insulation includes a secondary conductor and a secondary insulation layer disposed on the secondary conductor.

[0013] By adopting the above technical solution, the insulation layer of the secondary core can increase the insulation effect between the secondary core conductor and the main core conductor.

[0014] Optionally, the protective layer may further include a sheath layer disposed on the wrapping layer.

[0015] By adopting the above technical solution, the sheath layer can protect the wrapping layer.

[0016] Optionally, the shielding layer includes a second shielding layer and a third shielding layer disposed sequentially from the inside to the outside on the cabling wrapping layer, and the wrapping layer is disposed on the third shielding layer.

[0017] By adopting the above technical solution, the electric field interference can be effectively absorbed and shielded by setting a double shielding layer, thereby reducing transmission loss.

[0018] Optionally, both the main conductor insulation layer and the secondary conductor insulation layer are made of modified thermoplastic polyurethane.

[0019] By adopting the above technical solution, the wear resistance and flexural modulus of thermoplastic polyurethane far exceed those of the existing traditional insulation materials. It has high mechanical strength, cold resistance, oil resistance and moisture resistance, and can effectively ensure the insulation effect.

[0020] Optionally, the cabling wrapping layer is made of glass fiber low-smoke halogen-free fiber tape.

[0021] By adopting the above technical solutions, the glass fiber low-smoke halogen-free fiber tape has high temperature resistance and does not produce halogens when burning, which can reduce the dense smoke generated during a fire, thereby reducing the harm to the human body.

[0022] Optionally, both the second and third shielding layers adopt a composite shielding structure consisting of copper wire braiding and aluminum-plastic composite tape.

[0023] By adopting the above technical solution, double-layer shielding can effectively absorb and shield electric field interference, greatly reduce transmission loss, and reduce the shielding suppression coefficient.

[0024] In summary, the beneficial technical effects of this application are as follows: during a fire, the boron carbide particles in the high-temperature resistant particle layer can block the flame, thereby protecting the internal filling layer, the three main insulated wires and the three neutral insulated wires, thus preventing the flame from affecting the transmission point. Therefore, it can help the frequency converter cable to continue to operate effectively during a fire. Attached Figure Description

[0025] Figure 1 This is a cross-sectional structural diagram of an embodiment of this application.

[0026] Explanation of reference numerals in the attached diagram: 11. Main conductor core; 12. Main conductor core insulation layer; 13. First shielding layer; 14. Wrapping tape layer; 21. Secondary conductor core; 22. Secondary conductor core insulation layer; 31. Filler layer; 32. High-temperature resistant particle layer; 33. Cable wrapping tape layer; 34. Second shielding layer; 35. Third shielding layer; 36. Wrapping layer; 37. Sheath layer. Detailed Implementation

[0027] The following is in conjunction with the appendix Figure 1 This application will be described in further detail.

[0028] This application discloses a high-temperature resistant, low-loss, long-life, environmentally friendly low-voltage frequency conversion cable.

[0029] Reference Figure 1A high-temperature resistant, low-loss, long-life, environmentally friendly low-voltage frequency conversion cable includes three main insulated wires, three neutral insulated wires, and a protective layer. The three main insulated wires and three neutral insulated wires are wrapped inside the protective layer, with two adjacent main insulated wires located on both sides of one of the neutral insulated wires, and two adjacent neutral insulated wires located in the gaps on both sides of one of the main insulated wires.

[0030] The main insulated wire includes a main conductor 11, a main insulation layer 12, a first shielding layer 13, and a wrapping layer 14. The main insulation layer 12 is disposed on the main conductor 11, the first shielding layer 13 is disposed on the main insulation layer 12, and the wrapping layer 14 is disposed on the first shielding layer 13. The neutral insulated wire includes a secondary conductor 21 and a secondary insulation layer 22 disposed on the secondary conductor 21.

[0031] Reference Figure 1 The protective layer includes a filler layer 31, a high-temperature resistant particle layer 32, a cabling wrapping layer 33, a second shielding layer 34, a third shielding layer 35, a wrapping layer 36, and a sheath layer 37. The filler layer 31 fills the gaps between the three main insulated wires and the three neutral insulated wires. The high-temperature resistant particle layer 32 is disposed on the filler layer 31. The cabling wrapping layer 33 is disposed on the high-temperature resistant particle layer 32. The second shielding layer 34 is disposed on the cabling wrapping layer 33. The third shielding layer 35 is disposed on the second shielding layer 34. The wrapping layer 36 is disposed on the third shielding layer 35. The sheath layer 37 is disposed on the wrapping layer 36.

[0032] Both the main conductor 11 and the secondary conductor 21 are made of Category 5 tin-plated copper conductors, which can enhance the flexibility and bending radius of the main conductor 11 and the secondary conductor 21, so as to facilitate later construction and effectively improve the service life of the conductors.

[0033] Both the main core insulation layer 12 and the secondary core insulation layer 22 are made of modified thermoplastic polyurethane. The wear resistance and flexural modulus of modified thermoplastic polyurethane far exceed those of the existing traditional insulation materials, and it has high mechanical strength, cold resistance, oil resistance and moisture resistance.

[0034] The first shielding layer 13 uses a copper-plastic composite tape. The copper-plastic composite tape has a low cost, but it can achieve mutual shielding of the three main conductor cores 11, which can effectively enhance the anti-interference ability among the three, improve signal transmission, reduce loss, and the shielding suppression coefficient can be less than or equal to 0.05.

[0035] The wrapping layer 14 is made of polyester, which can effectively prevent the possibility of open circuit between the main conductor 11 and the secondary conductor 21. The filler layer 31 is filled with low-smoke halogen-free polypropylene rope, which does not absorb moisture and is well adapted to cable operation.

[0036] The cabling wrapping layer 33 is made of low-smoke halogen-free glass fiber tape. This tape is highly resistant to high temperatures and burns without producing halogens, making it a preferred environmentally friendly material. The high-temperature resistant particle layer 32 is made of boron carbide particles coated on the inner surface of the low-smoke halogen-free glass fiber tape. The boron carbide particles have strong chemical resistance and a temperature resistance rating exceeding 1000 degrees Celsius, significantly preventing cable combustion caused by accidents and thus ensuring the continued effective operation of the frequency converter cable in the event of a fire.

[0037] The second shielding layer 34 after cabling adopts a composite shielding structure of copper wire braiding and aluminum-plastic composite tape, with a braiding density of greater than or equal to 85%, and the aluminum-plastic composite tape facing inward. The third shielding layer 35 also adopts a composite shielding structure of copper wire braiding and aluminum-plastic composite tape. The double-layer shielding can effectively absorb and shield electric field interference, greatly reduce transmission loss, and achieve a shielding suppression coefficient of less than 0.008.

[0038] The wrapping layer 36 is made of non-woven fabric to provide a tightening effect. The sheath layer 37 is used to protect the cable.

[0039] The implementation principle of the high-temperature resistant, low-loss, long-life, environmentally friendly low-voltage frequency converter cable in this application embodiment is as follows: In the event of a fire, the boron carbide particles in the high-temperature resistant particle layer 32 can block the flames, thereby protecting the internal filling layer 31 and the three main insulated wires and three neutral insulated wires within the filling layer 31, thus preventing the flames from affecting the transmission point. Therefore, it can help the frequency converter cable to continue to operate effectively in the event of a fire.

[0040] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. A high temperature resistant, low loss, long life, environmentally friendly low voltage frequency conversion cable. Features: It comprises a protective layer, three main line insulated wires and three neutral line insulated wires arranged in the protective layer; The protective layer comprises a filling layer (31), a high temperature resistant particle layer (32), a cabling tape layer (33), a shielding layer and a wrapping layer (36) which are arranged in sequence from the inside to the outside; The cabling tape layer (33) is made of glass fiber low-smoke zero-halogen fiber tape, and the high-temperature resistant particle layer (32) is made of boron carbide particles, which are coated on the inner surface of the glass fiber low-smoke zero-halogen fiber tape.

2. According to claim 1, a high temperature resistant, low loss, long life, environmentally friendly low voltage frequency conversion cable, Features: The main line insulated wire comprises a main line core conductor (11), a main line core insulation layer (12) arranged on the main line core conductor (11) from the inside to the outside, a first shielding layer (13) and a tape layer (14).

3. A high temperature resistant, low loss, long life, environmentally friendly low voltage frequency conversion cable according to claim 2, Features: The neutral line insulated wire comprises a secondary core conductor (21) and a secondary core insulation layer (22) arranged on the secondary core conductor (21).

4. According to claim 1, a high temperature resistant, low loss, long life, environmentally friendly low voltage frequency conversion cable, Features: The protective layer further comprises a sheath layer (37) arranged on the wrapping layer (36).

5. According to claim 1, a high temperature resistant, low loss, long life, environmentally friendly low voltage frequency conversion cable, Features: The shielding layer comprises a second shielding layer (34) and a third shielding layer (35) which are arranged on the cabling tape layer (33) in sequence from the inside to the outside, and the wrapping layer (36) is arranged on the third shielding layer (35).

6. A high temperature resistant, low loss, long life, environmentally friendly low voltage frequency conversion cable according to claim 3, Features: The main core insulation layer (12) and the secondary core insulation layer (22) are both made of modified thermoplastic polyurethane.

7. According to claim 3, a high temperature resistant, low loss, long life, environmentally friendly low voltage frequency conversion cable, Features: The cabling tape layer (33) is wrapped with a glass fiber low-smoke halogen-free fiber tape.

8. According to claim 5, a high temperature resistant, low loss, long life, environmentally friendly low voltage frequency conversion cable, Features: The second shielding layer (34) and the third shielding layer (35) both adopt a composite shielding structure of copper wire braiding and aluminum-plastic composite tape.

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