SU1721843A1 - Induction heater for heating of fluid medium - Google Patents

Abstract

The invention can be used to produce hot water in various rooms. The purpose of the invention is to increase the heating efficiency. For this, the heater contains a closed double-core magnetic core, windings and steel pipes for the passage of the heated medium. Additionally, each steel tube is covered by a gap with a non-magnetic metal tube, which forms a short-closed turn. 2 Il.

Description

The invention relates to electrical engineering and can be used to create electrical equipment designed to produce hot water in various rooms, agricultural and household objects, as well as to heat other liquid fluids that do not enter into active chemical interaction with steel tubes of induction. heater

The aim of the invention is to increase the heating efficiency.

Figure 1 is a schematic representation of the construction of the core and the hub unit of a water heater with a tubular core; figure 2 - section aa in Fig, 1.

The core consists of six (or more) steel tubes 1, symmetrically arranged around the circumference inside the frame 2 of the primary winding 3. Outside the steel tube 1 is pressed aluminum tube 4, which is slightly shorter than the steel one,

that the ends of the latter protrude to a certain length. At these protruding ends of the steel tube, Form 5 is assembled from 0.35 mm thick sheets of transformer steel. The sheets are stamped with holes on the outer diameter of the steel pipe, ensuring the fixing of the core tubes during assembly, with an air gap between the tube and the throttle not exceeding 0.1 mm. The package 5 is tightly fastened to each of the core tubes with steel fittings 6, for which the ends of the steel tubes are threaded. Between the rotor 5, a rubber sealing washer 7 and a steel pressure washer 8 are installed to press the package of the package and seal the threaded connection of the fitting 6 with the tube. An insulation (getinax, textolite, etc.) support washer 9 is provided between the rom 5 and the tubes 1 and 4 of the core; increasing the footprint of the bag and eliminating the transfer of pressing force

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when tightening the fitting 6 on the frame 2 of the primary winding 3.

The primary windings 3, located on the core of the water heater, are interconnected according to and connected to the voltage of the AC mains, while the working magnetic flux F is generated in the magnetic core, which passes through the conduit 5 and also through each of the steel tubes . Due to the symmetrical arrangement of the tubes inside the winding 3, as well as the identical dimensions of the tubes, the equality of their electrical and magnetic resistances, the working flow is evenly distributed between them.

The variable magnetic flux, the passage through the core tube, induces, as mentioned above, the EMF in the body of the steel tube and in the aluminum tube pressed on it, which results in heating (Joule) losses heating each core tube. Heat from the heated tubes is removed by the water flowing inside the steel tubes. In this case, the core tubes are connected to each other in series with the help of rubber adapter pipes, which are worn over the nipples and tightly fastened to them with hose clamps (not shown). The path of water in the tubes of a single core is shown schematically

arrows and set designations - Mifi®. The water inlets to the inlet fitting of the core and the removal of hot water from the outlet fitting are carried out by flexible hoses, tightly clamped on the fittings by clamps (not shown).

The proposed water heater has an increased heating efficiency of the core, due to the fact that heating losses are mainly emitted in aluminum tubes. This provides a faster process of heating water than in known water heaters.

Claims (1)

Claims of the Invention An induction heater for heating a fluid, comprising a closed double-core magnetic core, the rods of which are enclosed by the induction windings and are made in the form of a bundle of steel tubes connected in series with pipes for the passage of the heated medium to form a heating chamber, characterized in that in order to increase the heating efficiency , each of the steel tubes, the wall thickness of which is chosen to be equal to the depth of penetration of the magnetic flux, is covered without gap along the entire length agnitnoy metal tube forming the short coclosed coil. F figure 1