SU1541790A2 - Loop inductor for local heating - Google Patents

Abstract

The invention relates to electrical engineering. The purpose of the invention is to increase the efficiency of heating. In the inductor for local heating with direct conductors consisting of series-connected coils of greater and lesser length and return conductors of short and long coils, part of the coils is covered by a U-shaped magnetic conductor, and a part is L-shaped. The inductor is fixed in the housing, which allows adjusting the gap between the turns, and performing the length of the turns more than half the circumference provides an increase in heating rate and increases efficiency. 4 il.

Description

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The invention relates to electrical engineering, can be used for heat treatment of a weld after welding, and is an improvement of the invention according to the author. No. 1103366.

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

Figure 1 shows a looped inductor (with the housing front ring removed), a general view; figure 2 - section aa in figure 1; on fig.Z - section bb in figure 1; figure 4 - scheme of the winding coil.

The inductor consists of a coil 1 made of a copper tube and consisting of two series-connected turns of greater length 2, turns of smaller length 3, return conductors of short turns 4 and return conductors of long turns 5. Turns 2-4, forming a window, cover the P- figurative

the magnetic conductor 6, and the turns outside the window are grasped by L-shaped magnetic conductors 7, consisting of several sectors with installation between them in a staggered order through two sectors of the fixing pins 8 soldered to the turns. The body consists of two rings 9, fastened with strips 10. Outside the body is closed by a cylindrical shell 1 1.

Temperature equalization under the coil with longer coils is achieved by centering the inductor relative to the heated pipe 12 and adjusting the gap between the coils 2 with the L-shaped magnetic cores mounted on them due to grooves in the strips 10 in which the fixing pins 8 are clamped, while the zone width varies slightly. heating. Thermal radiation from the coils

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The cores and magnetic circuits are protected by thermal insulation 13.

Loop inductor works as follows.

During welding, the metal pipe 12 is pulled under the inductor. As it passes under the coils 3, the pipe 12 heats up to a predetermined temperature: and under the coils 2 it is kept at the same level

Increasing the length of the coils more than half the length of the circumference of the housing and, accordingly, of the heated pipe, ensures obtaining the required duration of tempering and increases the welding speed of the pipes, which results in an increase in the overall heating efficiency.

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Claims (1)

Invention Formula Loop inductor for local heating by auth.St. No. 1103366, characterized in that 8 in order to increase the heating efficiency, the inductor's protective casing is made in the lead of a squirrel cage, coaxially annular The JQ elements of which are internally arranged on the inside with longitudinal strips, in the grooves of which the studs of long turns of straight coil conductors are made, which are longer than 15 half the circumference of the body, and the L-shaped packages of the magnetic circuit consist of a set of sectors adjacent to each other along the length of the turns. ten 13 AA 13 Editor O. Golovach 3 3 ShgA Compiled by O. Shchedrina Tehred M. KhodanychKorrektor T.Malets 1541790 b c {turned) .11