WO2018147761A1

WO2018147761A1 - Toroidal fluid induction heater

Info

Publication number: WO2018147761A1
Application number: PCT/RU2017/000616
Authority: WO
Inventors: Лев Захарович ДУДАРЕВ
Original assignee: Лев Захарович ДУДАРЕВ
Priority date: 2017-02-08
Filing date: 2017-08-24
Publication date: 2018-08-16

Abstract

The invention relates to the field of electric heating and can be used in heating systems for buildings, for supplying hot water, and in processes for heating fluids where a low temperature gradient between a heater and the fluid to be heated is required. The invention consists in a device containing a toroidal ferromagnetic core with a rectangular cross section (1) and an internal cavity along its length, said cavity being divided into chambers by partitions with triangular openings at either side, an electrical core winding (2) in the form of an insulated wire, an inlet (3) for supplying a fluid to be heated to the internal cavity of the core, and an outlet (4) for the heated fluid. The proposed device works as follows. An AC voltage with an industrial frequency of 50/60 Hz 220/380 V is supplied to the winding (2) comprised of insulated wires, which generates an electromagnetic field of force. Together with a magnetic flux, an electric current is generated which closes along the outline of the core (1) in the plane of the winding coils and heats a housing. In order to remove the resulting heat, a cold fluid is fed in through the inlet (3) and discharged in heated form through the outlet (4) after passing through the chambers of the internal cavity of the housing.

Description

INDUCTION TOROIDAL LIQUID HEATER

The invention relates to the field of electric heating and can be used in heating systems of buildings, for hot water supply and in technological processes with heating liquids, where it is required to provide a small temperature gradient between the heater and the heated liquid.

The invention is a device containing a toroidal ferrimagnetic core of rectangular cross section with an internal cavity along the length of the core, divided into chambers by partitions with triangular openings on each side, an electrical core winding made by an insulated wire, an inlet pipe for supplying a heated fluid to the inner cavity of the core, and an outlet pipe for heated fluid .

The prior art inventions and utility models of such devices and purposes.

Patent for invention RU 2337279 C1 published on 10.27.2008 Vortex induction heater for water or air. Intended for heating water or air in agriculture, construction and other fields of application. The device comprises an industrial frequency inductor, a vortex chamber in the form of a package of plates made of ferrimagnetic material, placed in its working volume with a gap between the plates for the passage of water or air with a peripheral swirl and inlet and outlet pipes. Microchannels are applied on the surface of the plates.

The disadvantage of this device is the low efficiency of heating water or air due to the fact that the external inductor of industrial frequency cannot evenly warm the entire package of plates with gaps between them. The swirling of water or air in the vortex chamber does not lead to the transfer of this process into the space with narrow gaps between the plates and, thus, the goal is not achieved - to increase the efficiency of heat transfer by swirling the heated water or air.

US patent 3,414,698 of December 3, 1968. High voltage transformer as a fluid heater. The device contains a primary high-voltage winding located on the toroidal core from a package of water pipes, which at the same time are the secondary winding of the transformer. The device is intended for heating water in swimming pools.

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SUBSTITUTE SHEET (RULE 26) The disadvantage of the design of the device is the need to meet high requirements for ensuring electrical safety, high metal consumption and high magnetic resistance of the core, which reduces the power factor and efficiency of the device.

The closest analogue to the claimed invention is a patent for the invention RU2267869 C1 published January 10, 2006. Flowing induction fluid heater. It contains a toroidal winding of the inductor superimposed on the core, characterized in that the core consists of a thin-walled tubular coil made of stainless steel, which serves to increase the heat transfer surface, is superimposed on the coil, playing the role of a magnetic circuit and a heating element, the winding of a steel tape as a result of which the whole volume of ferrimagnet; To improve heat transfer from the heater core, a wire spiral is used, introduced into the lumen of the coil pipe, leading to additional fluid circulation. The design drawback is the use of stainless steel pipes for heat transfer having significantly lower thermal conductivity than steel pipes and the manufacture of a magnetic circuit and a heating element in the form of a winding from steel tape, which is a rather complicated process.

The invention according to the set of essential features differs from the analogue in that the rectangular cross-sectional core contains an internal cavity along the entire length of the core with wall thickness, in which the electromagnetic field energy generated by the winding is absorbed by 99% in the ferrimagnetic core material and turns into heat, the internal the cavity is divided by transverse partitions into chambers, in the partitions, triangular holes are made alternately in the upper and lower parts along the course of the fluid Stia providing fluid movement diagonally turbolizatsiey chambers with liquid over the entire inner cavity of the core from the inlet to the outlet fluid conduit heater.

The present invention is aimed at solving the technical problem of creating a device providing the following technical result.

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SUBSTITUTE SHEET (RULE 26) Creation of an electric induction toroidal heater of liquids with lower cost and labor costs using standard parts from the catalog of steel pipe rolling and steel sheet in the manufacture.

Obtaining effective heat transfer between a heated ferrimagnetic core and a heated liquid with a minimum temperature gradient and without loss of scale on the walls of the inner cavity of the core, as well as being able to safely heat flammable liquids.

The indicated technical tasks and solutions are interconnected with the formation of a stable set of features to obtain the necessary technical result - a device that provides effective heating of liquids in the claimed field of application with high efficiency and power factor, low metal consumption, reliable operation and the possibility of organizing mass production.

The proposed technical solution is illustrated by the following figures.

In FIG. 1 shows an induction toroidal fluid heater assembly with core 1, induction coil 2, input 3 and output 4 nozzles.

In FIG. 2 shows the assembly parts of an induction toroidal fluid heater including the lower part of the core 5, the inner wall 6 with transverse partitions 1, the outer wall 7, the upper wall 8 with inlet and outlet openings for the liquid 9 and inlet 3 and outlet 4 nozzles for connecting to an external network.

In FIG. 3 is a diagram illustrating the principle of operation of an induction toroidal fluid heater with a core 1 with an internal cavity divided by partitions 10 into chambers 11 with triangular openings in the partitions 12 and an approximate trajectory of the fluid 13.

The proposed device operates as follows.

An alternating current voltage of industrial frequency 50/60 Hz 220/380 V is supplied to the winding from insulated wires 2, which creates an electromagnetic force field.

The magnetic component of the field creates a magnetic flux, which is concentrated in the core in the outer surface layer, the depth of which is less than the calculated core wall thickness. The magnetic flux is closed along the contour of the toroid orthogonally to the plane of the turns of the winding. Together with the magnetic flux 14, an electric current 15 arises in the same layer, which closes in the core along the circuit in

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SUBSTITUTE SHEET (RULE 26) the plane of the winding turns and heats the case. The wall thickness of the core is selected based on the criterion that the energy of the electromagnetic field generated by the winding will be absorbed in the ferrimagnetic material of the core by 99%. The amount of heat generated in accordance with the Joule-Lenz law will be proportional to the electrical resistance of the material of the ferrimagnetic core and the current strength to the second degree. To remove the received heat through the inlet pipe 3, cold liquid is supplied, which, after passing through the chambers of the inner cavity of the core, is heated out through the outlet pipe 4. The degree of heating of the liquid depends on the volume, speed, heat capacity of the liquid and the number of chambers in the inner cavity of the core. An important parameter in determining the number of chambers for a given value of the liquid outlet temperature is also the liquid viscosity parameters and requirements for permissible vaporization.

The alternating direction of fluid movement in the chambers and the triangular shape of the inlet and outlet openings in the partitions contribute to enhanced turbulization of the fluid, which ensures efficient heat transfer from the core walls to the heated fluid. Thus, the present invention allows us to apply not only simple technological schemes of mass production, but also get the best results in terms of efficiency in terms of efficiency, power factor, reliability and durability of the structure.

The proposed device was manufactured and tested in practice using standard industrial equipment. Structural elements necessary for assembling the proposed induction toroidal fluid heater are completed in accordance with the developed working drawings.

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SUBSTITUTE SHEET (RULE 26)

Claims

Formula

An induction toroidal fluid heater having a toroidal inductor winding superimposed on the core is characterized in that the rectangular cross-sectional core contains an internal cavity along the entire length of the core with wall thickness, at which the electromagnetic field energy generated by the winding is absorbed by 99% in the ferrimagnetic core material and turns into heat, the internal cavity is divided by transverse partitions into chambers, in the partitions, alternately in the upper and lower parts, move Triangular holes are made for the fluid, providing fluid movement along the diagonal of the chambers with fluid turbolization throughout the entire internal cavity of the core from the inlet to the outlet of the fluid heater.

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SUBSTITUTE SHEET (RULE 26)