CN102074293A

CN102074293A - Heat-resistant 155-DEG C enclosed motor lead wire

Info

Publication number: CN102074293A
Application number: CN2010105878086A
Authority: CN
Inventors: 金捷; 张立国
Original assignee: Tianjin Huazhiyang Special Cable Co Ltd
Current assignee: Tianjin Huazhiyang Special Cable Co Ltd
Priority date: 2010-12-15
Filing date: 2010-12-15
Publication date: 2011-05-25

Abstract

The invention relates to a heat-resistant 155-DEG C enclosed motor lead wire. The lead wire is characterized by consisting of a metal conductor, an inner braid, an outer braid and a lapped layer, wherein the outer side of the metal conductor is wrapped by the inner braid, the lapped layer and the outer braid in turn; the inner braid and the outer braid are formed by braiding fibers which are made of polyethylene naphthalate (PEN); and the lapped layer is formed by winding the inner braid by using a thin film strip which is made of the PEN. In the lead wire, the PEN is used as the material of an inner layer, an outer layer and the middle lapped layer between the inner layer and the outer layer; and since the PEN has high chemical stability, the PEN is stable for organic solution and chemical medicaments, and the acid resistance, the alkali resistance and the high temperature resistance are superior to those of polyethylene terephthalate (PET).

Description

Heat-resisting 155 ℃ of enclosed motor lead wires

Technical field

The present invention relates to field of cables, especially a kind of heat-resisting 155 ℃ of enclosed motor lead wires.

Background technology

The insulating barrier of present enclosed motor lead wire adopts the inside and outside layer of polyster fibre braiding, and the structure of the middle wrapped polyester film of inside and outside layer.The material of polyster fibre and polyester film is polyethylene terephthalate (PET) (or PETG), and the temperature resistant grade of this kind material is up to 125 ℃, can not be used for the enclosed motor lead wire of higher temperature grade.

When polyester raw material is used to freeze the insulation of impervious machine, need oligomer content very low, otherwise easily oligomer is extracted by the infiltration of lubricating oil and refrigerant, thus the electrical fault of causing.The fusing point of PET is lower, hot property is relatively poor, in 180 ℃ of dry airs, place after 10 hours, it is very crisp that PET under equal conditions will become, and oligomer content is than higher, and PET is to organic solution and chemicals poor stability in addition, under actual serviceability temperature, it is more to separate out oligomer, and resistance to water is also relatively poor, does not meet the requirement of the external integument of high-temperature grade refrigeration impervious machine enclosed motor lead wire.

Summary of the invention

The objective of the invention is to overcome the deficiencies in the prior art, heat-resisting 155 ℃ of enclosed motor lead wires that a kind of thermal endurance is strong, compatibility is good are provided.

The present invention solves its technical problem and is achieved through the following technical solutions:

A kind of heat-resisting 155 ℃ of enclosed motor lead wires, form by metallic conductor, interior braid, outer braid and inside and outside braid and lapping layer, the metallic conductor outside is the interior braid of parcel, lapping layer, outer braid successively, described inside and outside braid is to be formed by the fibrage that PEN is made, and lapping layer is that braid forms in being twined by the film band that PEN forms.

Advantage of the present invention and beneficial effect are:

1, the present invention adopts the inside and outside layer of PEN (PEN) conduct, and the material of the middle lapping layer of inside and outside layer, because PEN has good chemical stability, PEN is stable to organic solution and chemicals, and the ability of acid and alkali-resistance is better than PET.

2, the present invention adopts the air-tightness of PEN good, and molecular weight is relatively large, and under actual serviceability temperature, the tendency of separating out oligomer is little.

When 3, the poly-naphthalene ester that uses of the present invention is used to freeze the insulation of impervious machine, in strand, PEN has substituted the phenyl ring among the PET by the bigger naphthalene nucleus of rigidity, and naphthalene ring makes PEN have performances such as higher physical and mechanical properties, gas barrier property, chemical stability and heat-resisting, UV resistant, radiation hardness than PET.PEN can reach the requirement of 155 ℃ of long-term work temperature.The oligomer content of PEN has only below 0.5% simultaneously, and far below the content about PET2.5%, so the compatibility of PEN and cold-producing medium and lubricating oil also is far superior to PET.With PEN be used to the to freeze inside and outside braid and the lapping layer of impervious machine enclosed motor lead wire, can reach the requirement of 155 ℃ of levels fully.

Description of drawings

Fig. 1 is a structural representation of the present invention.

Embodiment

The invention will be further described below by specific embodiment, and following examples are descriptive, is not determinate, can not limit protection scope of the present invention with this.

A kind of heat-resisting 155 ℃ of enclosed motor lead wires, form by lapping layer 3 in the middle of metallic conductor 1, interior braid 2, outer braid 4 and the inside and outside braid, the metallic conductor outside is the interior braid of parcel, lapping layer, outer braid successively, described inside and outside braid is to be formed by the fibrage that PEN is made, and lapping layer is that braid forms in being twined by the film band that PEN forms.

Inside and outside layer of the present invention and the wrapped PEN that uses layer by layer contain naphthalene nucleus, improved macromolecular aromaticity, place in 130 ℃ humid air after 500 hours, percentage elongation only descends 10%, in 180 ℃ of dry airs, place 10h after, percentage elongation still can keep 50%, the fusing point of PEN is 265 ℃, and its vitrification point is more than 120 ℃, and the mass fraction of oligomer only is 0.5% among the PEN, resistance to water is 4 times of PET, and thermal endurance reaches the requirement of 155 ℃ of dielectric films.

Claims

1. heat-resisting 155 ℃ of enclosed motor lead wires, it is characterized in that: form by metallic conductor, interior braid, outer braid and inside and outside braid and lapping layer, the metallic conductor outside is the interior braid of parcel, lapping layer, outer braid successively, described inside and outside braid is to be formed by the fibrage that PEN is made, and lapping layer is that braid forms in being twined by the film band that PEN forms.