SU1406188A1 - Arrangement for electric-contact heating - Google Patents

Abstract

The invention relates to a device for electrical heating. The purpose of the invention is to increase the intensity of heating and reduce // / I / // х / ХУ / ХХ / хxXjT // XXу х f /, Г / electricity costs by reducing heat loss. The device includes a housing 1 with loading openings, conductive powder 2, a powder compactor in the form of an annular elastic chamber, electrodes 9 are located in the powder around the product. When voltage is applied to the device, the current is closed through the conductive powder 2 between the electrodes 9 and the product parallel circuit, in branch x of which current flows of the same magnitude. Due to the same current density in the transition zone over the entire length of the heated product, local overheating does not occur and high transient resistance in all parts of the product is maintained throughout the entire time, which ensures uniform high-speed heating. 1 hp f-ly, 1 ill. I Air 7 //. 2 3 u s (L with Jlki about o 00 00 J l

Description

The invention relates to electrical heating and can be used to continuously heat long metal products.

The purpose of the invention is to increase the intensity of heating and reduce electricity costs by reducing heat loss.

The drawing shows the device l electrical heating, a longitudinal incision.

The device comprises a cynical shape case 1 with end walls 3 heat insulated from the conductive powder 2, in which holes 4 are made with sealing and sleeves 5 for the passage of the heating product 6, and a loading chamber 7 with a piston 8 for filling the current lead is made on one of the end walls powder 2. Inside chamber 1, a chamber 9 of elastic material of an annular shape is placed. The chamber 9 encloses the current-carrying powder 2 with the electrodes 10 placed therein. These are located around the heated product 6. The surface of the chamber 9, which is in contact with the conductive powder 2, is lined with thermal insulation material, for example, asbestos fiber. Thermal insulation material is attached, for example, glued, forming the chambers in separate places.

The device works as follows.

Before starting work at atmospheric pressure (or vacuum), heated product 6 is passed through sealing sleeves 5. Conductive powder 2 is poured through loading chamber 7 and is preliminarily sealed by piston 8. Gas or liquid is supplied to elastic chamber 9 the result is a uniform sealing of the conductive powder 2 around the heated product 6 and the electrodes 10. One of the contacts of the current source is connected to the heated product 6 by means of rolling or sliding contacts, and ugoy - to the electrodes 10, insulated from the housing 1. When a voltage on the device is closed the current through the current-conducting powder between 2 elektr0

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10 and product 6, forming a parallel circuit in which branch x current flows of the same magnitude, which is ensured by the same distance and density of the powder between the electrodes and the workpiece. Due to the same current density in the transition zone over the entire length of the heated product, local overheating does not occur and high transient resistance in all parts of the product is maintained throughout the entire time, which ensures uniform high-speed heating.

Since the current flows only along that part of the powder, which is in the zone between the electrodes and the heated product, only its energy (not including the heated product) is given to it, and the entire volume of the powder is surrounded by the heat insulating material, the heat loss in the proposed device is obtained below.

Thus, the proposed device provides high-speed heating at low heat losses.

This device can work as a device of the active type.

Claims (2)

1. Device for electrical heating, containing a cylindrical body with loading openings with sealing bushings on its end walls, conductive powder, compacting conductive powder, current source with contacts, characterized in that, in order to increase the heating intensity and reduce electricity costs due to the reduction of heat losses, the device is equipped with electrodes, installed 1 and coaxially to the housing and connected to one of the contacts, and the sealing of the conductive powder is made in the form of an annular chamber made of an elastic material with a gas or liquid supply nozzle located in the housing and enclosing the conductive powder. 2. The device according to claim 1, about tl, which is that the annular chamber is made with a thermal insulation coating attached to the surface facing the conductor of the first powder.