RU168140U1 - FLEXIBLE WINDING WIRE - Google Patents

Abstract

The utility model relates to the cable industry of the electrical industry, namely, to the designs of copper round enameled wires used for mechanized winding of the windings of electrical machines. The claimed utility model contains one copper round conductive core and multi-layer enamel insulation, while varnish is used as a primer varnish on a polyvinyl formaldehyde basis with a dry residue of 21 ± 1%, a viscosity of 2800-4800 mPas and a temperature index of 120 ° C, and subsequent layers of enamel insulation can be made s of modified polyesters or varnish on a polyetherimide basis with a dry residue (38 ÷ 44) ± 2%, viscosity from 700 to 1850 mPas and temperature index 155 ÷ 180 ° С, from varnishes on a polyamide base with a dry residue from 26 ± 2% to 35 ± 1%, viscosity from 650 to 3000 mPas and a temperature index of 200 ° C (second or third layer). The technical result provided by the given set of features is to obtain a wire with improved insulation adhesion to the conductive core and the subsequent layer and improved wire elasticity in combined with high heat resistance bone, thermal stability, increased electrical strength, increased abrasion resistance, a smooth surface with a low coefficient of friction, as well as high chemical resistance of the wire, which is provided by subsequent layers of insulation.

Description

The utility model relates to the cable industry of the electrical industry, namely, to the designs of copper round enameled wires used for mechanized winding of the windings of electrical machines.

The main trend, which has been manifesting for many years up to the present, is the transition to the production of electric machines and apparatuses with higher technological parameters, which requires the use of enameled wires not only with a high temperature index and high mechanical insulation strength, but they are also presented high requirements and high elasticity of the wire with no cracking in the manufacture of windings of electrical machines, this is especially true for wires with large cross-sections niyami (1,600 mm and above).

Known enamel wires with insulation of wires from varnishes on a polyvinyl formaldehyde basis of the brands "Viniflex" - VL 931 and "metalvin" - VL 941 with a viscosity of 500-700 s (VL-941) and 300-600 s (VL-931) and no dry residue less than 16.0% for VL-941 and at least 20-25% for VL-931 and a temperature index of varnishes of 105 ° C.

Signs of a known wire, coinciding with the features of the claimed utility model, consist in the execution of the wire with the application of a varnish layer on a conductive core on a polyvinyl formal base.

The reason that prevents obtaining a result in a known technical solution, which is provided by the claimed utility model, is the use of varnish grades as insulation that do not meet the requirements for the level of adhesion to the conductive core in combination with the varnish properties, which ultimately determine the high elasticity and flexibility of the wires with cross sections 1,600 mm and above.

The closest analogue (prototype) is a winding wire with a two-layer combined enamel insulation, containing a round copper conductive core having a two-layer insulation, characterized in that a layer of enamel made of polyester varnish with a TI of 130 ° C is applied to the copper conductive core, and the second layer is enamel a coating with a temperature index (TI) of 155 ° C (patent RU No. 63591, M. cl. HB01 1/00, published on 05.27.2007).

Signs of a known wire, coinciding with the features of the claimed utility model, consist in the execution of the wire with a metal conductive core and multi-layer insulation.

The reason that prevents obtaining a result in a known technical solution, which is provided by a utility model, is the use of a varnish on a polyvinyl formaldehyde as a primer of the claimed utility model with characteristics providing a 2-3-fold improvement in adhesion and elasticity of the wire.

The problem the utility model aims to solve is to produce wires with a cross section of 1,600 mm and higher with multilayer insulation, which provides a combination of the varnish layers applied in series, combining the necessary characteristics of the wire (based on the properties of each insulation layer), such as improved adhesion to the conductive a core with an increase in the elasticity of the wire by 2-3 times, increased thermal characteristics and increased mechanical and electrical strength of the wire.

This problem is solved due to the fact that the claimed technical solution contains one copper round conductive core and multilayer enamel insulation, while the varnish on the basis of polyvinyl-based with a dry residue of 21 ± 1%, a viscosity of 2800-4800 mPas and a temperature index is used as a primer 120 ° С, and subsequent enamel insulation layers can be made of modified polyesters, polyester-based varnish with a dry residue (38 ÷ 44) ± 2%, viscosity from 700 to 1850 mPas and temperature index 155 ÷ 180 ° С, from varnishes on polyamidimide basis with a dry residue of 26 ± 2% to 35 ± 1%, a viscosity of 650 to 3000 mPas and a temperature index of 200 ° C (second or third layer).

The technical result provided by the given set of features is to obtain a wire with improved insulation adhesion to the conductive core and improved wire elasticity, which provides high-quality winding of electrical machines without cracking, combined with high temperature resistance, thermal stability, increased electrical strength, increased abrasion resistance, smooth surface with a low coefficient of friction, as well as the high chemical resistance of the wire, which is ensured by the last blowing insulation layers.

The claimed utility model is implemented in a standard way for the manufacture of enamel wire.

The wire intended for enameling is wound from the giving device due to the force of the traction device of the drawing attachment. Then the wire passes through the drawing attachment, where its diameter changes to the required size. After this, the wire passes through the cleaning device, cleaning itself of the remnants of the emulsion, copper dust. To impart ductility lost in the drawing process during drawing, the wire passes through the furnace. At the exit of the annealing furnace there is a wire cooling system designed to prevent oxidation of the wire; the system is a vertical box through which the wire passes and through which water circulates. Residual water from the wire is blown away by pressure air. After annealing, the wire enters the lacquer, where enamel is applied. A layer of varnish is applied to the wire, after which it passes through an enamel furnace, a cooling box and returns back to the spraying device, where the next layer of varnish is applied to it, etc. Thus, the insulation on the wire is applied in layers, with heat treatment of each layer in an enamel furnace. After heat treatment in an enamel furnace, each passage of the wire passes through the cooling box, where it is cooled, in order to prevent insulation damage when in contact with the upper revolving rollers. After the passage of the last pass, the enamel wire, through the control system of the diameter and pinpoint damage of the insulation of the finished wire, enters the receiving device, where it is wound on the receiving coil.

After the manufacture of wire with insulation from varnishes with the specified characteristics, wire samples are tested. The test results (protocol No. 59 of 04/08/2016) are presented in table 1.

Technological tests showed an increase in adhesion by 50-60%, the elasticity of the wire increased by 2-3 times.

The cable design has been successfully tested in the production environment.

Claims (5)

1. A winding wire containing one copper round conductive core having a multilayer enamel insulation, characterized in that the primer uses a polyvinyl formaldehyde-based varnish with a dry residue of 21 ± 1%, a viscosity of 2800-4800 mPas and a temperature index of 120 ° C. 2. The wire according to claim 1, characterized in that modified polyesters with a dry residue (38 ÷ 44) ± 2%, viscosity from 700 to 1850 mPas and temperature index 155 ÷ 180 ° C are used as the second insulation layer. 3. The wire according to claim 1, characterized in that the polyesterimide-based varnish with a dry residue (38 ÷ 44) ± 2%, viscosity from 700 to 1850 mPas and temperature index 155 ÷ 180 ° C is used as the second insulation layer. 4. The wire according to claim 2, characterized in that a polyamide-imide based varnish with a dry residue of 26 ± 2% to 35 ± 1%, a viscosity of 650 to 3000 mPas and a temperature index of 200 ° C is used as the third insulation layer. 5. The wire according to claim 1, characterized in that a polyamide-imide based varnish with a dry residue of 26 ± 2% to 35 ± 1%, a viscosity of 650 to 3000 mPas and a temperature index of 200 ° C is used as the second insulation layer.