SU856043A1 - Inductor for local heating of articles - Google Patents

Description

(54) INDUCTOR FOR LOCAL PRODUCT HEATING

I

The invention relates to electrothermal in particular induction heating, and can be used in pipe industry for the local heat treatment of pipe welds.

Inductors are known for local heating of pipe joints, consisting of windings and magnetic cores. The winding of the inductor consists of inductive wires of wires, facing the heated area of the product, and return conductors located above the inductors. The magnetic core encompasses the induction of inductor conductors and concentrates the current in them on the surface facing the heated lice t.

The disadvantage of this inductor is the possibility of damage to the electrical insulation of the inducting conductors by thermal radiation from the surface of the heated product and

the complexity of the design of the inductor, due to the need to use a magnetic circuit, which also reduces the operational reliability of the indzttora.

The inductor, consisting of a sector of inductive conductors and located symmetrically along both

to the side of it are the return conductor sectors spanning the f2j tube.

However, this inductor can damage the electrical insulation of inductive conductors by thermal radiation from the surface of the heated product.

Claims (3)

The closest to that proposed by technical means is an inductor for local heating of goods, made in the form of a coil with inductors and return conductors, and a secondary turn in the form of a conductor 1 of a water-cooled tire installed under the inductive L3J conductors. The disadvantage of this inductor is its low efficiency, due to the low degree of power transfer from the inductive conductors to the screen, and from it to the heated product. The purpose of the invention is to increase the efficiency of the inductor. The goal is achieved by the fact that in the device the bus is electrically connected in series and in accordance with the inducing conductors of the coil. Fig. I shows the electrical circuit of the inductor; in fig. 2 - inductor, cross section. The inductor conductors 1 of the inductor are located above the heated zone 2. The return conductors 3 and 4 are arranged symmetrically to the inductor conductors 1. The tire 5 is located along the induction conductors 1 between them and the heated zone 2. The bus 5 is connected in series with the inductor coils of the inductor using a topops 5); 6, for example, in the gap between the return conductors 3 and the inductor terminal block 7, with which the latter is connected to a power source (not shown). The coil of the inductor is covered with a layer of electrical insulation, however, it is separated from the inducer conductors 1 by insulating pads 8. The current from the power source through the terminal block 7 is supplied to the inductor and flows along the bus 5 (arrow 9), through the current lead 6 passes to the return conductors 3 ( arrow 10) and then flow down the inducing conductors (arrow II). At the same time, a current 13, which flows along the tire 5, is induced in the tire 5 on its surface 12 facing the inducing conductors 1, and, zamzhcha through its ends, flows along the surface 1A facing the heated zone 2 (arrow 15). The current 15, in turn, induces in the heated part a current 16, heating 434 the zone 2 to be heat treated. In addition, in zone 2 it is induced by the eye 9 flowing in the bus 5 from its conductive connection with the turns of the inductor, the current 17 causing Additional heating zone 2. If it is impossible to place an inductor on the heated body, in which the return conductors 3 and 4 are located above the product surface symmetrically inducing conductor 1, an inductor with a magnetic core can be used, in which the reverse turns are located yeny over inducing. And in this case, an increase in its efficiency can be accomplished by connecting the bus 5-sequence. but also agrees with inductive turns of the inductor. An increase in the efficiency of an inductor is due to an increase in the power transmission from the inductor and further to the component being heated due to the fact that conductive coupling is added to inductive connections, the effectiveness of which depends on geometric constructions. Claims of the invention: Inductor for local heating of products, for example, pipe welds, made in the form of a coil with inducing and return conductors and a secondary coil in the form of a conductive water-cooled tire installed under the inducing guide pads, because of In order to increase the efficiency of the inductor, the bus is electrically connected in series and in accordance with inductive conductors of the coil. Information sources taken into account during the examination 1. Spuotsky A.Ye. and others. Inductors dp indukdonnogo heating, Energy, 1274, p. 105-109, 129-132. 2. USSR author's certificate for application number 2635396/02, cl. H 05 B 5/18, 1978. 3. USSR author's certificate number 461135, cl. H 05 B 5/18, 1U72.