CS261776B1 - Supplying electrical current to the rod electric heating device by direct current flow - Google Patents

Abstract

The electric current supply to the device for electric heating of rods by direct current passage is intended for a device consisting of axially adjustable electrodes for introducing electric current into heated rods or pipes. The electric current supply is made in the shape of a round or polygonal tube and thermal insulation is placed in it. The tube and thermal insulation can be closed in part or along the entire circumference. The electric current supply to the device for electric heating of rods by direct current passage is usable in the engineering industry, where it is necessary to heat electrically conductive, relatively slender rods and pipes, e.g. during forming, spring coiling, annealing of rods, etc.

Description

(54) Power supply to the electrical rod heating device by direct current passage

The power supply to the device for electric heating of the bars by direct current passage is intended for the device consisting of axially adjustable electrodes for introducing electric current into the heated bars or pipes. The power supply is designed in the form of a round or polygonal tube and has thermal insulation. The pipe and the thermal insulation may be in part of its circumference or along the entire circumference. water closed. The power supply to the direct current electric rod heating device is useful in the engineering industry where it is necessary to heat electrically conductive, relatively slender rods and tubes, for example, during forming, springing, rod annealing, etc.

BACKGROUND OF THE INVENTION 1. Field of the Invention The invention relates to power supplies to a device for electric heating of bars by direct current passage.

The prior art devices for electric heating of rods by direct current passage consist of inlets of this current formed by strips or rods. Moreover, this supply is not thermally insulated.

Both of these factors lead to a deterioration of the cob heating coefficient as well as to heat losses and thus to a deterioration of the overall energy efficiency.

These drawbacks are eliminated by the power supply to the device for electric heating of bars by direct current passage, consisting of axially adjustable electrodes for introducing electric current into heated bars or pipes according to the invention. Its essence consists in the fact that it is in the form of a round or waveguide tube and contains thermal insulation. The pipe and thermal insulation may be closed in part or all around the perimeter.

The arrangement of the device according to the invention reduces the overall magnetic dispersion of the current supply system and thus improves the efficiency of the device. In addition, additional energy savings are caused by thermal insulation, since the heated rod does not radiate to its surroundings by far as much as in normal embodiments of rod heating by direct current passage.

BRIEF DESCRIPTION OF THE DRAWINGS The invention and its effects are explained in more detail in the description of an exemplary embodiment of the accompanying drawing, in which FIG. 1 is a cross-sectional front view and FIG.

The heated rod 10 is mechanically inserted from below into a coaxial power supply 2, in particular a round or polygonal, for example a rectangular, copper or aluminum tube, in which the thermal insulation 2 is placed. coaxial power supply 2 is divided into two parts which are connected to a power supply and each of them supplies current to one axially adjustable electrode 2, ^from which the heating current passes to the heated rod 10 and the heated rod 10 then to a second axially adjustable electrode 2 ^{at the} other end of the heated rod 10 disposed in the second part of the coaxial power supply 2. According to the length of the heated rod 10 are axially adjustable electrode 2 is axially movable by a first fastening screw £ and the second fastening bolt 2 and optionally a reinforcing bracket 2 ⁸ third fastening screw 2 ^{and a} receiving portion 2 * reinforcing brace 2 ⁸ receiving portion 2 me read reinforcing function and may be omitted if the coaxial power supply tube 2 itself is sufficiently rigid to accommodate the thrust forces of the heated bars 10 acting on the axially adjustable electrodes 2;

Due to the large heating currents, for example thousands to tens of thousands of amperes, the coaxial power supply tube 2 can be cooled by water flowing through the toasted supply tubes 4. ^{For the} axial displacement of the axially adjustable electrodes 2 ⁱⁿ the power supply tube 2, the required density in the axial direction. Along with the axial adjustment of the axially adjustable electrode 2 ^, a corresponding modification of the thermal insulation 2 is also carried out, also consisting in its axial displacement, so that the space for the axially adjustable electrode 2 is created elsewhere.

The power supply to the direct current electrical heating rods of the present invention is applicable anywhere in the engineering industry where it is necessary to heat electrically conductive, relatively slender bars and tubes, such as forming, springing, annealing and the like.

Claims (3)

OBJECT OF THE INVENTION CLAIMS 1. Supply of electric current to a device for electric heating of bars by a direct current passage, consisting of axially adjustable electrodes for introducing electric current into heated bars or pipes, characterized in that it is in the form of a round or polygonal pipe and contains Insulation (9). 2. The power supply to the electric rod heating device according to claim 1, characterized in that the pipe and the thermal insulation (9) are closed in part of their circumference, 3. The power supply to the rod heating apparatus according to claim 1, characterized in that the pipe and the thermal insulation (9) are completely closed at the periphery.