RU55502U1 - WINDING WIRE FOR SUBMERSIBLE ELECTRIC MOTORS - Google Patents

Abstract

The utility model relates to electrical engineering and relates to the design of insulated winding wires, the main purpose of which is electric motors of submersible electrical installations, such as oil and water pumps, electric drills, other special submersible devices, as well as traction motors of electric rolling stock. The utility model is aimed at improving the technical and operational characteristics of a winding wire, due to the use of linear aromatic semi-liquid crystal polymer as an insulation material, applied to a conductive core of different sections by extrusion. At the same time, the electrical insulation resistance of the wire, its mechanical strength, chemical resistance to acids, alkalis, ketones, alcohols and other solvents increase, and its field of application expands.

Description

The proposed utility model relates to electrical engineering and relates to the design of insulated winding wires, the main purpose of which is electric motors of submersible electrical installations, such as oil and water pumps, electric drills, other special submersible devices, as well as traction motors of electric rolling stock,

A specific feature of submersible electrical installations is that the windings of their motors are directly exposed to the pumped liquid. In this regard, the principal features of the winding wires of the specified field of application in comparison with other areas are:

- an enlarged section of the conductive core;

- increased dielectric strength;

- chemical resistance to oils, petroleum products, alkalis, acids, alcohols and other aggressive environments;

- high mechanical strength due to significant tensile, abrasive and cutting loads in the manufacturing process of electric motors;

- long-term operation at high temperatures.

Structurally, the winding wires are a single or multi-wire conductive core with insulation. Insulation can be performed in one of two ways: by baking layers of polymer tapes or by extrusion (extrusion).

As polymeric materials for insulation of winding wires for submersible electric motors, as a rule, low and high density polyethylene, polypropylene, polyvinyl chloride, fluoroplast, enamel are used.

The following insulation types were most widely used (see Mesenzhik Y.Z., Osyagin A. A. "Cables and wires for geophysical, hydrological research and mining", Encyclopedic Handbook, Volume 1 - Tver: Publishing House GERS, - 2002, p. 289 ~ 297);

- two-layer of low and high density polyethylene tapes;

- two-layer of two materials - polyethylene and polypropylene;

- two-layer of enamel and polyvinyl chloride plastic compound;

- multilayer (up to 5 layers) tape from different types of fluoroplastic or polyimide-fluoroplastic films;

- single-layer monolithic insulation from an extruded fluoroplastic layer;

- two-layer of a fluoroplastic film of one brand and an extruded layer of fluoroplastic of another brand, etc.

The main technical and operational characteristics of the winding wires are largely dependent on the insulation materials and for the listed types are (see ibid.):

- operating voltage in the range from 380 to 3000 V;

- breakdown voltage of isolation - from 4.5 to 12 kV;

- electrical insulation resistance - from 8 to 200 megohms per km. lengths;

- heat resistance (or heat resistance} - from 80 ° C to 200 ° C; in exceptional cases - briefly up to 250 ° C for wires with multilayer insulation

fluoroplastic films;

- mechanical strength specified by the number of reciprocating wire pulling in the motor housing, from 300 to 500;

- chemical resistance, estimated by the change in physical and mechanical characteristics after exposure to aggressive environmental factors, is different: from ± 25% to ± 50% of indicators.

Improving the technical characteristics of winding wires for submersible motors is mainly through the use of new insulation materials and improvements in the technology of their application.

So, in the “Method for the manufacture of wires” (RF patent for the invention No. 2161833 dated 12.11.1999, IPC N 01 B 13/06 and H 01 B 13/24) a method for cooling insulation applied by extrusion from thermoplastic polyethylene onto a conductive one is proposed vein in water baths with different water temperatures. The proposed technology allows to obtain insulation of increased thickness and without defects and capable of working at high voltage. However, the proposed method applies only to polyethylene and its applicability to other polymers is not confirmed. In addition, a characteristic feature of polyethylene is a reduced operating temperature (not higher than 80 ° C-90 ° C), which limits their use only to water pumps.

The patent “Winding wire for submersible water-filled electric motors” (RF patent for utility model No. 31879 dated April 18, 2003, IPC N 01 B 7/00) proposes a number of materials for the manufacture of two-layer insulation of a conductive core: high density polyethylene or enamel - as the first layer and block copolymer of propylene with ethylene - as the second layer. But this solution is also limited in application by water immersion devices due to the reduced heat resistance of insulation materials.

Closest to the proposed option is a winding wire for submersible electric motors according to the patent of the Russian Federation for utility model No. 14472 of 24.02.2000, IPC HO 1 7/04, Two wire options are offered here: with single or double layer insulation. Moreover, the single-layer insulation is made of a block copolymer of propylene with ethylene with the inclusion of 0.1-0.6 wt.% Copper deactivator. In wires with two-layer insulation, it is proposed to use one of the polymers as the second layer: polypropylene, high density polyethylene or the same block copolymer of propylene with ethylene,

The inclusion of 0.1-0.6 wt.% Of a copper deactivator in the insulation material is due to the fact that the block copolymer without this additive, when interacting with a copper core, is subject to rapid aging. Therefore, a wire with block copolymer insulation is suitable for installation in devices whose service life is not long. However, the problem of low resistance to heat-oxidative aging of the block copolymer is not completely removed by the proposed solution. In addition, the maximum allowable operating temperature of the wire with insulation from block copolymer does not exceed 150 ° C, which also limits its scope.

The objective of the proposed utility model is to improve the technical and operational characteristics of the winding wire due to the use of linear aromatic as its insulation material

Semi-liquid polymer of the latest generation.

To solve the problem in a winding wire for submersible electric motors containing a conductive core coated with insulation, the latter is made in the form of a continuous monolithic sheath of a linear aromatic semi-liquid polymer of the latest generation, and this polymer contains hydroxy-1,4-phenylinoxy-phenylcarbonyl-carbonyl-1 4-phenyline.

The thickness of the insulation by extrusion can be performed in the range from 0.1 to 0.7 mm, depending on the diameter of the core.

Conductors can have a round or rectangular cross-section.

The proposed improvements to the winding wires will improve their basic physical and technical parameters and dramatically increase the service life of both the wires themselves and the electric motors in which the wires are operated.

The linear aromatic semi-liquid polymer proposed for use is a new high-quality insulating material. The technical characteristics of the linear aromatic polymer proposed for use are many times higher than the similar characteristics of other polymers used in cable products of the indicated applications in the following parameters:

- by electrical resistance of insulation and mechanical strength by an order of magnitude;

- breakdown voltage in 1.5-4.0 times;

- at a working temperature of 20-30 ° C, block copolymer - at - at 90 ° C-110 ° C;

- in chemical resistance to acids, alkalis, ketones, alcohols and other solvents - tens of times, which is extremely important when using this wire in oil immersion motors and drills.

In addition, the structure of the material of the linear aromatic polymer proposed for use, allows to obtain almost perfectly smooth outer surface in the manufacture of wires. This leads to a sharp decrease in the abrasion of the wire both in the manufacture of the stator winding of the electric motor by the multiple pulling of the wire, and during its operation, and, as a result, additionally increases its mechanical strength and durability as a whole.

As a linear aromatic semi-liquid polymer, a material sold under the trademark VICTREX PEEK can be used.

The proposed version of the wire shown in figure 1 and figure 2.

The embodiment of the wire of figure 1 contains a conductive core 1 of circular cross section, covered with a layer of insulation 2. Figure 2 presents a winding wire with a conductive core 1 of rectangular cross section and insulation 2.

The process of manufacturing wire insulation is as follows.

Granules of linear aromatic semi-liquid polymer 2, for example, VICTREX PEEK., Are placed in the hopper of the extruder, where they are heated to a melt state (360 ° С-410 ° С). The melt simultaneously with the previously cleaned conductive core 1 under pressure is pulled through

forming element - extruder head of the extruder. The cross section of the extrusion head corresponds to the configuration of the wire. The wire coming out of the head is passed through a bath with coolant. The cooled wire is wound on a drum.

A predetermined diameter of the wire is provided during the manufacturing process with a calibrated hole of the extrusion head of the extruder and the force of pressing the molten material.

Depending on the purpose of the finished product, the wire, after measuring the phase lengths, is wound, laid or stretched into the grooves of the stator of the electric motor.

The proposed winding wire for submersible electric motors with insulation based on a linear aromatic semi-liquid polymer helps to solve the problem of improving the technical and operational characteristics of the wire. This will not only increase the life of oil and water pumps, electric drills, as well as some other special submersible devices and electric motors of rolling stock, but also increase the range of products of this profile, offering consumers simple and reliable products.

Claims (4)

1. A winding wire for submersible electric motors, containing a conductive core coated with insulation, characterized in that the insulation is made in the form of a continuous sheath of a linear aromatic semi-liquid polymer. 2. The winding wire for submersible electric motors according to claim 1, characterized in that the linear aromatic semi-liquid polymer contains hydroxy-1,4-phenyl-phenoxy-phenyl-carbonyl-carbonyl-1,4-phenyl. 3. Winding wire for submersible motors according to claims 1 and 2, characterized in that the insulation thickness is from 0.1 to 0.7 mm. 4. Winding wire for submersible motors according to claims 1 to 3, characterized in that the conductive core has a round or rectangular cross section.