A kind of preparation method of composite insulating pipe
A composite insulation and consistent technology, applied in insulators, electrical components, circuits, etc., can solve the problems of poor electrical performance of composite insulation tubes, easy existence of air bubbles, poor weather resistance, etc., to meet the requirements of temperature uniformity, avoid air bubbles, The effect of improving electrical performance
Active Publication Date: 2021-10-15
JIANGSU WONEN ELECTRIC TECH
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Problems solved by technology
[0003] However, some industries have higher and higher requirements on the weather resistance and anti-brittle performance of wires and cables. Common multifunctional cables use conventional polyvinyl chloride, cross-linked polyolefin and other materials as insulation and sheath materials, and these materials are made of Insulation tubes have poor overall strength, poor weather resistance and other deficiencies
In view of the above phenomenon, EVA and carbon black are generally used to prepare semi-conductive heat-shrinkable tubes, and then the outer surface of the semi-conductive heat-shrinkable tubes is extruded with viscous materials to wrap the EVA insulating layer, and finally dried. This method is used in production During the process, air bubbles are likely to exist between the EVA insulating layer and the semiconducting layer, resulting in poor electrical properties of the composite insulating tube
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[0029] The preparation method of the composite insulating tube of the present embodiment takes the transformer bushing of 110kv as an example, such as figure 1 As shown, it specifically includes the following steps:
[0030] Step 1: Heat-shrink coat a layer of semi-conductive heat-shrinkable tube 22 whose length is the same as that of the inner conductor 21 and whose wall thickness is 0.5 mm on the inner conductor 21 with a diameter of 72 mm.
[0031] Step 2: heat-shrink the semi-conductive heat-shrinkable tube 22 formed in the previous step and coat two layers of insulating heat-shrinkable tubes 23 whose length is consistent with the length of the inner conductor, and ensure that the total tube wall thickness of the two layers of insulating heat-shrinkable tubes 23 reaches 4mm.
[0032] Step 3: On the outermost insulating heat-shrinkable tube 23 formed in the previous step, heat-shrink coat a semi-conductive heat-shrinkable tube with a length difference of 50 mm from the len...
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Abstract
The invention relates to a preparation method of a composite insulating tube. The preparation method comprises the following steps: Step 1: successively shrink-coat a semiconductive heat-shrinkable tube and an insulating heat-shrinkable tube on an inner conductor to form a semi-finished composite insulating tube; Step 2: Put the prepared composite insulating tube semi-finished product into the autoclave, first heat it to 75-85°C until the composite insulating tube semi-finished product is in a semi-molten state, introduce nitrogen gas at the same time, and gradually pressurize to 0.8-1MPa; Step 3: Wait After the pressure in the autoclave reaches the standard, heat the autoclave to 175-185°C, keep it warm for 4-6min, and finally keep the pressure of 0.8-1Mpa to cool down until it cools down to room temperature to obtain a finished composite insulating tube. The advantage of the invention is that: through the process of the invention, the generation of air bubbles between layers of the composite insulating tube can be effectively avoided, thereby greatly improving the electrical performance of the composite insulating tube.
Description
technical field [0001] The invention relates to an insulating pipe, in particular to a preparation method of a composite insulating pipe. Background technique [0002] The application of wire and cable is mainly divided into three categories: power system, information transmission system and mechanical equipment, and instrumentation system. Wire and cable products are mainly divided into five categories: bare wires and bare conductor products, power cables, wires and cables for electrical equipment, communication cables, optical fibers and electromagnetic wires. Among them, the main feature of the power cable is that the insulation layer is extruded (wrapped) outside the conductor, such as overhead insulated cables, or several cores are twisted (corresponding to the phase wire, neutral wire and ground wire of the power system), such as overhead insulated cables with more than two cores, Or add a sheath layer, such as plastic / rubber sheathed wire and cable. [0003] However...
Claims
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IPC IPC(8): H01B19/00
CPCH01B19/00
Inventor 田塨朱兴祥
Owner JIANGSU WONEN ELECTRIC TECH