Heat-generating electromechanical converter
SUBSTANCE: invention relates to electric engineering, namely, to a heat-generating electromechanical converter designed for heating and/or movement of liquid or gaseous medium. The device comprises an additional fixed element made of antifriction non-electroconductive material, which performs the functions of a radial and/or thrust sliding bearing, from polymer composite material on the basis of epoxide-diane resin with filler from fluoroplastic powder, cut glass fibre and additionally aluminium oxide Al2O3 or silicon dioxide SiO2, which makes it possible to increase quantity of heat removed from the primary winding.
EFFECT: increased coefficient of heat conductivity of a fixed heat-insulating element provides for reduced temperature of primary winding of a heat-generating electromechanical converter, which accordingly increases reliability of its operation.
The invention relates to electrical engineering and can be used for industrial, agricultural and domestic use.
Known Electromechanical Converter comprising a primary winding, a magnetic core and a rotating squirrel-cage secondary winding in the form of a hollow cylinder, separated from the magnetic core additional insulating element of the antifriction elektroprovodyashchego material performs the function of a sliding bearing and constituting a single whole with a magnetic core and a primary winding, and on the inner surface of the secondary winding is formed and rigidly connected with it the pressure of the blade (the patent for useful model RF # 65335, IPC7NW 6/10, F25B 29/00).
The closest in technical essence is generating Electromechanical Converter comprising a primary winding, a magnetic core and a rotating squirrel-cage secondary winding, made in the form of a hollow cylinder, separated from the magnetic core additional insulating element of the antifriction elektroprovodyashchego material that performs the function of radial and/or thrust sliding bearing and constituting a single whole with a magnetic core and a primary winding, and on the inner surface of the secondary winding is formed and rigidly connected with it pressure lo the Asti, additional stationary heat insulating element consists of a polymer composite material based on epoxy resin with filler of PTFE powder-4 and chopped fiberglass, for example, when following a weight ratio of components: epoxy resin - 75...90%; PTFE - 4-8...24%; the rest is chopped glass fiber (patent RF №2410852, IPC NW 6/10, F25B 29/00, E21D 5/012).
The disadvantage of these devices is their low reliability, due to the intense thermal conditions of the primary winding.
The task of the invention is to improve the reliability of the device by improving the heat transfer between the winding and the cooling environment and reduce the heat load of the primary winding.
Technical result achieved in the process of solving the task, is to increase thermal conductivity of the material fixed additional heat insulation of the heat generating element of the Electromechanical Converter.
This technical result is a consequence of the use of additional fixed element of the antifriction elektroprovodyashchego material that performs the function of the radial and/or thrust sliding bearing, made of composite material based on epoxy-d is anovas resin with filler of PTFE powder, chopped fiberglass and aluminum oxide Al2O3or silicon dioxide SiO2that allows you to increase the conductivity of the composite material without reducing its electrical strength.
The essence of the invention is illustrated as follows.
Generating the Electromechanical transducer consists of a magnetic core with hosted network winding and a rotating squirrel-cage secondary winding, made in the form of a hollow cylinder, the inner surface of which is formed and rigidly connected with it the pressure of the blade. Rotating the secondary winding and the magnetic core are separated fixed additional insulating element of the antifriction elektroprovodyashchego material that performs the function of radial and/or thrust sliding bearing and which is integral with the magnetic core and the primary winding. Antifriction elektroprovodyashchie material consists of composite polymer based on epoxy resin with filler of PTFE powder, chopped fiberglass and aluminum oxide Al2O3(for example, in a weight ratio of: 75...85% of epoxy resin, 4...6% - fluoroplastic-4, 5...7% aluminum oxide Al2O3the rest is chopped fiberglass) or silicon dioxide SiO2(for example the EP, in a weight ratio of: 75...85% of epoxy resin, 4...6% - fluoroplastic-4, 6...12% silicon dioxide SiO2the rest is chopped fiberglass).
Table 1 provides examples of implementation of the composition used as the material fixed additional heat insulation of the heat generating element of the Electromechanical transducer with the inclusion of aluminum oxide, in table 2 - with the inclusion of silicon dioxide.
|The weight ratio of components using aluminium oxide|
|Components||I implementation||II implementation|
|T the blitz 2|
|The weight ratio of components when using silicon dioxide|
|Components||I implementation||II implementation|
When this epoxy resin and chopped glass fibers provide high strength, low shrinkage, good adhesion, low water absorption, Teflon - high wear resistance, low friction coefficient, high electrical resistance, the aluminum oxide Al2O3or silicon dioxide SiO2- high thermal conductivity fixed additional insulating element. During operation of the heat generating Electromechanical transducer primary winding is the most intense in thermal relation to the item, because is inside additional C is movable partition insulating element made of composite material. The amount of thermal power transferred from the primary winding, is determined by thermal resistance of the fixed additional insulating element, dependent thermal conductivity utverzhdenii epoxy resin (0,064 ...0,216 W/(m·K)), PTFE (0.25 W/(m·K)), chopped glass fiber (0,030...0,050 W/(m·K)). The use of aluminum oxide Al2O3with a thermal conductivity of 25...30 W/(m·K) or silicon SiO2with a thermal conductivity of 1...7 W/(m·K)) leads to lower thermal resistance, respectively, to increase the amount of exhaust from the primary winding heat and reduce its temperature. Reducing the winding temperature for each 10...12 degrees leads to an increase in its service life is almost doubled, which leads to increased reliability of the heat generating Electromechanical Converter.
Thus, additional stationary insulating element representing a radial and/or thrust bearing, of the composition, for example, in a weight ratio of: 75...85% of epoxy resin, 4...6% PTFE, 5...7% aluminum oxide Al2O3or 6...12% silicon dioxide SiO2the rest is chopped glass fiber, can reduce heating of the primary winding and reliably to increase the th generating the Electromechanical Converter.
Generating Electromechanical Converter comprising a primary winding, a magnetic core and a rotating squirrel-cage secondary winding, made in the form of a hollow cylinder, separated from the magnetic core additional insulating element of the antifriction elektroprovodyashchego material that performs the function of radial and/or thrust sliding bearing and constituting a single whole with a magnetic core and a primary winding, and on the inner surface of the secondary winding is formed and rigidly connected with it the pressure of the blade, with additional stationary heat insulating element consists of a polymer composite material based on epoxy resin, PTFE and chopped glass fiber, characterized in that the composition of the material forming the additional insulating item included aluminum oxide Al2O35...7% or silicon dioxide SiO26...12%, while the remaining components are in the following weight ratio: epoxy resin - 75...85%, fluoroplastic-4 - 4...6%, the rest is chopped fiberglass.
SUBSTANCE: induction heater with cross-flow ensures potential crossing of the conductive sheet side by an alternating magnetic field, at that the sheet is moved in one direction and thus induction heating of the conductive sheet takes place. The induction heater with cross-flow includes a heating coil placed so that the coil side faces the side of the conductive sheet; a core with the heating coil wounded around it; a screening plate formed of the conductor and placed between the core and butt end in the direction perpendicular to the direction of the conductive sheet movement; and non-conducting soft magnetic material which is fixed at the screening plate, at that the screening plate is placed between the core and non-conducting soft magnetic material.
EFFECT: invention allows excluding overheating of lateral sides of the conductive sheet in the heated object.
7 cl, 20 dwg
SUBSTANCE: device for induction heating by cross flow allows for the magnetic field crossing the face of a conductive sheet which is transported in one direction thus heating the conductive sheet inductively. The device for induction heating by cross flow comprises a heating winding set so that the winding face is turned to the conductive sheet face, a core around which the heating winding is wound, and a shielding plate formed from a conductor and set between the core and the side end section in the direction perpendicular to the conductive sheet movement, the shielding plate is fitted with a projecting section whose side surface is of closed loop if seen from the direction perpendicular to the winding face.
EFFECT: invention allows for the elimination of overheating of side end faces of the conductive sheet at the item being heated.
10 cl, 49 dwg
SUBSTANCE: electrical conductor is placed between at least a first electrical contact and a second electrical contact. A ferromagnetic conductor at least partially surrounds the electrical conductor and is at least partially placed along its length. Upon feeding alternating electrical current, the electrical conductor induces an electrical current in the ferromagnetic conductor which is sufficient to heat the ferromagnetic conductor owing to resistance to temperature of at least about 300°C.
EFFECT: heating system according to the invention provides an improved heating method, which enables to extract hydrocarbons, hydrogen and/or other products from different formations containing hydrocarbons.
25 cl, 23 dwg
SUBSTANCE: control unit of an induction heating unit controls an AC power supply lead to a heating coil of the induction heating unit of cross type, which makes it possible for AC magnetic field cross the surface of the conducting sheet that moves for inducting heating of the conducting sheet. The control unit comprises: a switch to recover magnetic energy, which discharges AC power supply to a heating coil; a unit of frequency setting, which sets the output frequency in response to at least one of relative permeability, resistance and thickness of the conducting sheet; a unit of gate control, which controls operation of switching of the magnetic energy recovery switch on the basis of the output frequency specified by the unit of frequency setting. Also a system of induction heating is proposed, comprising a control unit of an induction heating unit, a heating coil, a core and a protective plate, and also a method to control unit of induction heating.
EFFECT: even temperature distribution.
15 cl, 18 dwg
SUBSTANCE: device includes an induction heater, a magnetoconductive screen, a heat insulating casing, an induction winding enveloping a cylindrical capacity, an AC rectifier and an inverter connected to the induction winding and an inverter control unit, temperature sensors of inlet and outlet flows, which are connected to a temperature comparator that is connected to the inverter control unit and a pump control unit connected to a pump. It is equipped with a bypass pipe, one end of which is located in cross section of an inlet delivery branch pipe, at the inlet of which the pump is fixed mechanically, and the other end is located in cross section of an outlet suction branch pipe with an automatic shutoff-control element connected to the control unit of the shutoff-control element connected to the temperature comparator. With that, the induction heater is located horizontally; the cylindrical capacity is made from non-magnetic material with a vertical wall installed in liquid flow direction, and the cylindrical element is made in the form of a heat exchange tube from ferromagnetic material, which is located inside the cylindrical capacity with a gap and equipped with horizontal heat exchange rods installed inside the tube in a staggered order, heat exchange semi-spheres located on its outer surface in a staggered order, and a temperature sensor installed on outer surface of the heat exchange tube and connected to the temperature comparator.
EFFECT: simpler heater design and improved reliability and automation of the device operation.
SUBSTANCE: loop inductor elongated in longitudinal direction includes similar and opposite to each other plate longitudinal elements with evenly turned-up upper sections and flat lower sections located from each other at a distance which provides slide or medium fit at installation of the inductor along edges of rail head matching them. The first end parts of inductor longitudinal elements are interconnected by plate cross element which face and back surfaces have shape corresponding to the shape of central part of rail roller surface of a new rail. The second end part of each longitudinal component is equipped with plate cross half-element having shape that corresponds to the shape of respective rail roller surface of a new rail. Each cross element is equipped with current lead connected to the respective output lead of the matching unit.
EFFECT: invention provides even heating of a rail head both at roller face and from side edges; it also has high efficiency of electric energy conversion into thermal energy notwithstanding depth of deposition area.
7 cl, 6 dwg
FIELD: electrical engineering.
SUBSTANCE: device is made in the form of multi-pole rotor. The rotor includes excitation windings installed on ferromagnetic cores of the inductor coil; windings are mainly superconducting and direct current can be supplied to them. The cores are placed into rotating cryostat; the coolant is pumped through the cryostat suitable for induction of eddy currents in materials to be cut during rotation of the rotor. Eddy currents provide heating and melting of material. At that electromagnetic force arises along tangent towards direction of the rotor rotation thus tearing off a melted layer of the material being cut. At ferromagnetic cores of the inductor coil there are polar tips with tooth area providing maximum non-uniformity of magnetic field in the working gap to speed up heating.
EFFECT: superconducting winding provides significant increase of the inductor coil magnetic field.
3 cl, 1 dwg
SUBSTANCE: conversion device for induction heating based on a parallel bridge resonant inverter comprises two valve bridges on four controlled valves with DC and AC diagonals, parts of a throttle of an oscillating circuit, a source of supply, two capacitors, a double-winding inductor, semi-windings of which are arranged on a side surface of a crucible along the axis of the inductor and perpendicularly to this axis in an alternating sequence. In a control system in process of charge melting high-frequency single-phase electromagnetic field is generated, and in process of electromagnetic mixing and heating of a melted metal, double-frequency double-phase electromagnetic field is generated: low-frequency electromagnetic field with high-frequency modulation. By low frequency the electromagnetic field generated by the second valve bridge is shifted by 90° el. relative to the first valve bridge.
EFFECT: generation of a high-frequency single-phase electromagnetic field at the stage of metal melting and double-frequency double-phase electromagnetic field at the stage of electromagnetic mixing of melted metal and its heating with one conversion device, simplification and reduction of losses.
2 cl, 2 dwg
SUBSTANCE: device for heating and transportation of a liquid medium comprises a primary winding, a magnetic conductor, an element from an antifriction material, a rotary short-circuited secondary winding, where permanent magnets are installed. Interaction between the field of permanent magnets and the magnetic field of the primary winding as speeds of magnetic field and rotary winding rotation approach each other, increases the speed of cylinder rotation.
EFFECT: higher efficiency of a device.
SUBSTANCE: hardening method of part (W) described with closed curve such as bearing race or gear ring involves the following steps: to part (W) in starting zone there supplied are at least two inductors (13) in which inductors (13) occupy starting positions (S1, S2) close to each other, which restrict starting zone (Zs) between each other, starting zone (Zs) is heated at least by means of one of inductors (13) to hardening temperature and then starting zone (Zs) heated to hardening temperature is quickly cooled; inductors (13) are moved from the corresponding starting positions (S1, S2) along part (W); at that, movement direction (R1, R2) of one inductor (13) is opposite to movement direction (R1, R2) of the other inductor (13); sections of part (W), which are located in the influence zone of inductors (13), are heated to hardening temperature and then quickly cooled and opposite movement of inductors (13) are continued until inductors (13) reach final position (E1, E2) in which they are located close to each other; at that, end zone (ZE) is formed between final positions (E1, E2) of both inductors (13). For heating of end zone (ZE) inductors (13) of the corresponding end zone (ZE) perform common movement in direction (R1) of movement directions (R1, R2) of inductors (13) at heating of that end zone (ZE) to hardening temperature by means of the same inductor (13), in movement direction (R1, R2) of which common movement is performed. Device for hardening the part described with closed curve is equipped with control device (23) after inductors (13) reach final positions (E1, E2), which is provided with possibility of supplying control signals for movement of inductors (13) in movement direction (R1) of one of inductors (13) located near each other until end zone (ZE) enclosed between final positions (E1, E2) of inductors (13) is covered with influence zone of the same inductor (13) in movement direction (R1) of which inductors (13) move during their common movement.
EFFECT: uniform heating along the whole perimetre of hardened part.
20 cl, 3 dwg
SUBSTANCE: claimed invention relates to the field of casting resins for switching devices. Described is a solid resin system for insulating materials in the switching devices, which contains a solid bisphenol A-based resin, which has an epoxy number (DIN ISO 16945) from ≥0.2 to ≤0.3, and a liquid bisphenol F-based resin, which has an epoxy number (DIN ISO 16945) from ≥0.4 to ≤0.63, where a part of the liquid bisphenol F-based resin, measured as a weight to the total weight of the resin, constitutes from ≥5% to ≤60%, with the solid resin system before hardening having an epoxy number (DIN ISO 16945) from ≥0.2 to ≤0.55, and the solid resin system includes as resins only the said resins themselves. Also described is application of the said solid resin system as an insulating material in electric switching devices.
EFFECT: obtaining the solid resin system, possessing low susceptibility to cracking and high resistance to bursting.
7 cl, 1 ex
SUBSTANCE: resin contains methyl nadic anhydride and/or hydrogenated methyl nadic anhydride and imidazole of formula , where R1, R2, R3 and R4 are given in claim 1.
EFFECT: obtained resin has significantly higher glass transition temperature with high quality mechanical characteristics and tracking resistance.
3 dwg, 7 cl, 1 ex
SUBSTANCE: electric insulating filling compound contains epoxide diane resin, amine hardener in the form of triethylene tetramine (TETA), and also a modifier - a phosphorus-containing methyl acrylate (PCM), at the following ratio of components, wt parts: epoxide diane resin ED-20 - 100 triethylene tetramine (TETA) - 10-15 phosphorus-containing methyl acrylate (PCM) - 30-40.
EFFECT: reduced viscosity of a filling compound, its higher viability, improved elasticity after hardening, preservation of dielectric properties.
SUBSTANCE: surface modified electrical insulation system, comprising a cured synthetic polymer composition including at least one filler and optional additives, wherein the surface of said synthetic polymer composition is modified by applying a thin coating; said thin coating being applied via plasma enhanced chemical vapour deposition (PECVD) with thickness within the range of about 50 nm to about 50 mcm; and/or said thin coating is applied via a sol-gel technique with thickness within the range of about 0.5 mcm to about 2 mm; and wherein said thin coat is an electrically non-conducting polymeric material with melting point which is considerably higher than the melting point or degradation temperature of the synthetic filler containing polymer composition; and a method of making said electrical system involving formation of a hardened or cured synthetic polymer composition, applying a thin coating on the surface of said synthetic polymer composition via plasma enhanced chemical vapour deposition.
EFFECT: improved system.
18 cl, 2 ex, 4 tbl
SUBSTANCE: housing has inner layer and outer layer. Thickness of inner layer is at least by 50% more than thickness of outer layer, and inner layer is more flexible than outer layer. Inner layer is made from composition of the first resin which at hardening has relative elongation at rupture which is more than 5%, and outer layer is made from composition of the second resin which at hardening has relative elongation at rupture which is less than 5%.
EFFECT: improving insulation and strength properties of electric item, and profitability of its manufacture.
14 cl, 2 dwg
SUBSTANCE: invention is attributed to electric engineering in particular to hot hardening epoxy electrical embedment compounds intended for electrical insulation and strengthening of units and blocks of high-voltage devices, inductors, metal-loaded transformers, for sealing and protection of electronic equipment against moisture and mechanical impacts. Composition for electrical embedment compound contains (in mass p.): epoxy-diane resin - 60-70, triglycidyl ester of trimethylolpropane - 15-20, monoglycidiyl ester of alkyl phenol - 10-20, isomethyltetrahydrophthalic anhydride - 90-95, 2,4,6 tris(dimethylaminomethyl)fenol 0.8-1.0, quartz powder - 400-500. Due to small temperature coefficient of linear expansion, high volume electric resistance and mechanical strength, it is recommended to use offered compound for high-voltage devices containing dissimilar materials.
EFFECT: creation of electrical embedment compound with high values of specific insulation resistance, low dissipation factors of a dielectric and small temperature coefficient of linear expansion (TCLE).
FIELD: technological processes.
SUBSTANCE: invention is related to finishing baking enamels intended for production of insulating protective coatings for impregnated windings, units and parts of electric machines and devices with insulation of thermal endurance class of (155°C). Enamel that includes filming agent, coupling agent, siccative, pigments, fillers, desired additives and organic dissolvents, as filming agent it contains epoxy ester produced by reactions of etherification and thermal polymerisation 1.0 Mole of epoxy modified resins with content of epoxy groups of 3.5÷4.5 wt %, 2.4 Mole of fatty acids of bodied oils and 1.3 Mole of colophony, and as active filler for increase of electric strength of enamel coating it additionally contains hydrophobic aerosil at the following ratio: Epoxy ester (55%-solution in xylene) 62.0÷81.0, Hydrophobic aerosil 0.3÷0.6, Hydrophobic aerosol 0.3÷0.6, Pigments and fillers 13.0÷29.0, Hydrophobic aerosil 0.3÷0.6, Coupling agent 4.5÷5.5, Desired additives (dispenser, defoaming agent, thixotropic, anti-flotation, antioxidant) 1.5÷6.5, Siccative (cobalt oktoat) 0.2÷0.5, Organic dissolvents 1.5÷7.5.
EFFECT: higher class of enamel thermal endurance, higher adhesion of enamel coating, improvement of coating dielectric properties.
2 tbl, 7 ex
SUBSTANCE: invention pertains to a composition based on an epoxide resin, designed for sealing semiconductor devices. The compound consists of the following components in the given mass ratios: 100 epoxide resin "ЭД-22" with 22% content of epoxide groups for formation of a more compact and tough polymer network, 50 oligoester acrylates "МГФ-9", 20 metaphenylene diamine, 35 filler, 0.5 nigrosine as black dye and a catalyst of the solidification reaction of the epoxy groups. The filler is a mixture of 6.0 mass ratio of boron nitride, 4.0 mass ratio of talc and 0.8 mass ratio of aerosil.
EFFECT: invention provides sealing devices with extended surfaces of p-n-junctions and consistency of dielectric, mechanical and thermophysical properties of polymer material.
FIELD: electrical and instrumentation engineering, microelectronics.
SUBSTANCE: proposed epoxy resin based current-conducting adhesive composition characterized in high electric conductivity and high strength of glued joints at temperature ranging between -60 and +150 °C, as well as in case of glued joint shear at temperatures of 20 to 150 °C has following ingredients, parts by mass: nitrogen-containing epoxy resin, 100; curing agent (isomethyl tetrahydrophthalic anhydride or low-molecular polyamide), 40- 80; electricity-conducting filler (carbonic nickel), 416 - 475; aliphatic epoxy resin, 15 - 25; organic solvent, 15 - 25; (tris-2,4,6-dimethyl aminomethyl) phenol or mixture of λ-aminopropyl triethoxysilane and β-aminoisopropyl triethoxysilane isomers, 0.5 - 2.5.
EFFECT: enhanced strength and electric conductivity properties of adhesive composition.
5 cl, 2 tbl
FIELD: antenna engineering.
SUBSTANCE: proposed composite dielectric material used, for instance, to produce antenna lenses of desired dielectric constant and density capable of operating under vibrating load conditions at temperatures ranging between -60 and +85 °C has epoxy resin functioning as binder and hollow glass microspheres and titanium, as fillers, their proportion being given in invention specification.
EFFECT: enhanced resistance to vibrations, enlarged operating temperature range.
2 cl, 1 tbl
SUBSTANCE: group of inventions relates to heat exchange and can be used for cooling of air or equipment, as well as for waste heat utilisation. As per one of the versions, a heat-to-cold conversion device includes the first heat exchanger 2, steam generator 3, liquid heat carrier (cooling agent) 4, a thin plate with hole 5, condenser 6, grid 7, the second heat exchanger 8, overflow valve 9, vertical pipeline 10, counter pressure valve 11, dosing mechanism 12, turbine with magnetic coupling 13, fan 14, the second thin plate with hole 15, and solar collector 16.
EFFECT: improving heat exchange efficiency, economy, ecological compatibility, as well as improving reliability and durability, enlarging an application scope and enlarging functional capabilities.
14 cl, 3 dwg