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Aluminum alloy core composite shielding flame-retardant fireproof cable for frequency converter

A compound shielding, flame-retardant and fire-resistant technology, applied in the field of fire-resistant cables, can solve the problems of not meeting the requirements of fire-proof performance, prone to electric shock accidents, fires, etc., and achieve the effects of improving fire-proof performance, long service life and high safety factor

Inactive Publication Date: 2020-04-10
山东中电通电缆科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Because the frequency converter changes the frequency and amplitude of the AC motor’s working voltage, electric shock accidents are likely to occur, which can cause fires. Therefore, it is necessary to take insulation and fire protection for the cables in the frequency converter. The traditional protective materials are EVA materials modified by flame retardants. The flame retardant uses phosphorus flame retardants, nitrogen flame retardants and metal hydroxide flame retardants. Although these flame retardants have improved the flame retardant performance of EVA materials to a certain extent, they can meet the requirements of general cable materials. Flame retardant requirements, however, still do not meet the requirements for fire performance of aluminum alloy core composite shielded flame retardant and fire-resistant cables for frequency converters

Method used

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  • Aluminum alloy core composite shielding flame-retardant fireproof cable for frequency converter
  • Aluminum alloy core composite shielding flame-retardant fireproof cable for frequency converter
  • Aluminum alloy core composite shielding flame-retardant fireproof cable for frequency converter

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] Embodiment 1 The preparation of the polyolefine resin modified by bayerite and / or expanded graphite

[0022] The polyolefin resin is melted and masticated on a double-roller plastic refining machine, and the flame retardant is added to the melted polyolefin resin. After mixing sufficiently, the material is removed from the roller. The kneaded sample was pressed into a sheet-like material of required thickness on a flat vulcanizer at 160°C and 12MPa.

[0023] The dosage scheme of flame retardant is:

[0024] (1) The addition amount of the mezolite is 5%, 10%, 15%, 20%, 25%, 30%, and the mixing time is 30 minutes.

[0025] (2) The addition amount of expanded graphite is 5%, 10%, 15%, 20%, 25%, 30%, and the mixing time is 30min.

Embodiment 2

[0026] Embodiment 2 dosage optimization

[0027] Oxygen index measurement refers to GB2406-93, the sample is placed in the combustion column, the total gas flow rate is 10L / min=O 2 L / min+N 2 L / min, where, O 2 L / min oxygen flow / total flow = oxygen index. The minimum oxygen content required for the sample to extinguish within 3 minutes of burning in the mixed airflow and the length of the sample burning is less than 5cm is the oxygen index. The oxygen index greater than 21 is a self-extinguishing material, and greater than 26 is a flame retardant material.

[0028] Measure the oxygen index of the modified polyolefin resin prepared in embodiment 1, such as figure 1 As shown, the Oxygen Index of the Maxenite-modified polyolefin resin material reaches the maximum when the amount of Maxenite is 15%. Steam can block oxygen, therefore, the oxygen index gradually increases with the increase of the amount of ghatite, and when the amount is too much, due to the special structure of ...

Embodiment 3

[0030] The preparation of embodiment 3 hydroxyaluminite and expanded graphite composite modified polyolefin resin

[0031] The polyolefin resin is melted and plasticized on a double-roller plastic refining machine, and the evenly mixed bayerite and expanded graphite are added to the melted polyolefin resin. After mixing fully, the material is removed from the roller. The kneaded sample was pressed into a sheet-like material of required thickness on a flat vulcanizer at 160°C and 12MPa.

[0032] The total addition amount of the bayerite and the expanded graphite is 17.5%, wherein the additions of the bayerite and the expanded graphite are respectively: 10% of the bayerite, 7.5% of the expanded graphite; 7.5%, expanded graphite 10%; hydroxyaluminate 5%, expanded graphite 12.5%; hydroxyaluminate 2.5%, expanded graphite 15.0%; measure its oxygen index according to the method for embodiment 2, the results are shown in Table 1 Show:

[0033] Table 1

[0034]

[0035] It can be...

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Abstract

The invention discloses an aluminum alloy core composite shielding flame-retardant fire-resistant cable for a frequency converter. The cable comprises a phase line aluminum alloy conductor and a neutral line aluminum alloy conductor. Each conductor is coated with a ceramic fire-resistant belt and a flame-retardant insulating layer to form phase conductor cores and neutral conductor cores, each neutral conductor core is arranged between every two adjacent phase conductor cores, so that a cable core is formed, and the cable core is sequentially coated with a ceramic fire-resistant belt, an oxygen isolation layer, a copper wire braided shielding layer, a copper belt main shielding layer, a fire isolation layer, a metal armor layer and a halogen-free sheath layer. According to the prepared polyolefin resin modified by the mayenite and / or the expanded graphite, the fireproof performance of a fire insulation layer is greatly improved, the requirement of an aluminum alloy core composite shielding flame-retardant fireproof cable for a frequency converter for the fireproof performance can be met, and the frequency converter prepared from the polyolefin resin is high in safety coefficient and long in service life.

Description

technical field [0001] The invention belongs to the technical field of fire-resistant cables, and in particular relates to an aluminum alloy core composite shielding flame-retardant and fire-resistant cable for frequency converters. Background technique [0002] The frequency converter is a power control device that uses frequency conversion technology and microelectronics technology to control the AC motor by changing the frequency of the motor's working power supply. The inverter is mainly composed of rectification, filtering, inverter, braking unit, drive unit, detection unit and micro-processing unit. The frequency converter adjusts the voltage and frequency of the output power supply by switching off the internal IGBT, and provides the required power supply voltage according to the actual needs of the motor, thereby achieving the purpose of energy saving and speed regulation. In addition, the frequency converter has many protection functions , such as overcurrent, over...

Claims

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Application Information

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IPC IPC(8): H01B7/29H01B7/295
CPCH01B7/29H01B7/295
Inventor 王春生孙冰刘占粮王茂华朱伟董亭深孙涛杨楠
Owner 山东中电通电缆科技有限公司