Double-layer polyimide insulating leading and connecting wire of enclosed electric machine

Abstract

The invention relates to a double-layer polyimide insulating leading and connecting wire of an enclosed electric machine, and the double-layer polyimide insulating leading and connecting wire consists of a metal conductor, an inner braided layer, an outer braided layer, an inner wrapping layer and an outer wrapping layer. The inner braided layer, the inner wrapping layer, the outer wrapping layer and the outer braided layer package the outer side of the metal conductor in sequence; the inner braided layer and the outer braided layer are formed by braiding poly(p-phenylene terephthalamide) (aramid) fibers; and the inner wrapping layer and the outer wrapping layer are formed by winding the inner wrapping layer by a thin film strip made of polyimide. According to the double-layer polyimide insulating leading and connecting wire, the polyimide is adopted as the materials of the wrapping layers, and as the polyimide has favorable chemical stability, the high-temperature resistance performance is better than that of PET (polyethylene terephthalate), and the poly(p-phenylene terephthalamide) (aramid) used by the braided layers not only has favorable chemical stability and high-temperature resistance performance, but also has favorable mechanical performance, the leading and connecting wire of the electric machine is completely suitable to be applied on the occasions of a high-temperature and high-pressure refrigerating fluid and lubricating oil of the enclosed electric machine.

Description

Technical field [0001] The invention relates to the field of cables, in particular to a double-layer polyimide insulated enclosed motor lead wire. Background technique [0002] At present, the insulating layer of the lead wire of the enclosed motor adopts the structure of polyester fiber weaving the inner and outer layers, and the inner and outer layers are wrapped with polyester film. The materials of polyester fiber and polyester film are both polyethylene terephthalate (PET) (or polyethylene terephthalate). The temperature resistance grade of this material is up to 125℃ and cannot be used for replacement. Enclosed motor lead wires of high temperature class. [0003] When polyester raw materials are used for the insulation of refrigeration sealed motors, the content of oligomers needs to be very low, because the oligomers are easily extracted by the infiltration of lubricating oil and refrigerant, causing motor failure. PET has a low melting point and poor thermal performance. ...

AI Technical Summary

Problems solved by technology

Polyester fiber and polyester film are made of polyethylene terephthalate (PET) (or polyethylene terephthalate). Enclosed motor leads for high temperature ratings

[0003] When polyester raw materials are used for insulation of refrigeration sealed motors, the content of oligomers needs to be very low, because the oligomers are easily extracted by the infiltration of lubricating oil and refrigerant, causing motor failure

PET has a low melting point and poor thermal properties. After being placed in dry air at 180°C for 10 hours, PET will become very brittle under the same conditions, and the content of oligomers is relatively high. In addition, PET is stable to organic solutions and chemicals. Poor performance, under the actual use temperature, more oligomers are precipitated, and the water resistance is also poor, which does not meet the requirements for the outer wrapping layer of the high temperature grade refrigeration sealed motor and the enclosed motor lead wire

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