SU973637A1 - Three-phase salt bath - Google Patents

Description

The invention relates to electrothermal and can be used in thermal workshops tool and engineering plants.

A three-phase salt bath is known on the furnace with three electrodes covering the working space, installed symmetrically with respect to the center of the furnace and immersed by the working part in the molten salt, where in order to increase furnace productivity by increasing the resistance of the electrodes, the submerged and salt parts of the electrodes are made with a variable cross-section increasing evenly level of salt surface to the bottom of the bath. At the same time, the cross-sectional area of the lower end surface of the working part of the electrode exceeds 1.6 - 2.0 times the electrode cross-section at the salt surface 11 level.

A disadvantage of the known salt bath is the considerable consumption of electrodes and, as a consequence, heat loss.

The closest to the invention by its technical nature is a three-phase salt per bath, containing three-phase electrodes installed in one row in a multiple of three.

and an additional electrode, where, in order to increase the efficiency of the bath and the life of the electrodes by reducing the phase load and temperature of the molten salt in the electrode area, the additional electrode is connected to one of the outermost electrodes and installed at the opposite etty end of the specified row t2.

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A disadvantage of the known salt bath is that the installation of the fourth electrode entails additional heat loss due to an increase in the bath mirror and heat loss in the water-cooled coil of the fourth electrode, as well as the cost of its manufacture.

The purpose of the invention is to reduce heat loss and the consumption of electrodes.

The goal is achieved by the fact that in a three-phase salt bath containing a skeleton, an intermediate casing, an intermediate skin lining 25 ha, three electrodes arranged horizontally and parallel to each other in the bottom part of the bath and sealing the electrodes, the electrodes are installed at different levels

Claims (2)

30, their longitudinal axes are placed at the vertices of an equilateral triangle, with one of the electrodes connected to the current lead from the opposite end relative to the remaining electrodes. In addition, the bath is provided with bushings rigidly fixed on the furnace frame and connected with cold and cold ends of the electrodes by means of a threaded joint. FIG. 1 shows a bath; transverse section; in fig. 2 is a section A-A in FIG. one ; in fig. 3 shows a section in FIG. 2. The bath contains frame 1 and intermediate, casing 2 with MULTI-LAYER thermal insulation 3 between them. The intermediate casing 2 is lined from the inside with shaped high-alumina bricks 4. Two extreme electrodes 5 are inserted into the bath through one of the walls of frame 1, and the middle electrode b is opposite to the electrodes 5 through the opposite wall 5. The level on which the electrode is located is not the level on which the electrodes are located 5, so that their longitudinal axes form the vertices of an equilateral triangle. The cold ends of the electrodes are threaded and have levers 7 for rotating the electrode in fixed threaded sleeves 8 fixed in brackets 9 mounted on the frame and electrically insulated from it. Water-cooled sleeves 10 fitted with coils 11 with nipples 12 serve as guides for the electrodes. 10 are also electrically insulated from the frame cage 1. On the electrodes 5 and b, the clamping devices 13 are fixed, ensuring the contact of the electrodes with flexible current leads 14. The structural elements that are under voltage are protected by the skin Hami 15 The regulation of the electrode system is carried out as follows. Rotating interacting with fixed threaded bushings 8 electrodes 5 and b using levers 7 you can / by moving the electrodes in the forward or backward direction in water-cooled sleeves 10 to achieve complete elimination of phase distortion, as well as the desired match of the installed and consumed power phases. The dimensions of the bath mirror are determined only by the dimensions of the heat-treatable. Investigator-. but, the heat loss from the mirror is minimal. The sealing of the electrodes at the points of entry into the melt is carried out by cooling in water-cooled sleeves 10. In addition to reducing heat loss and the material of the electrodes, this design allows more complete use of the power supply transformer. The possibility of adjusting the installed power by the electrode system to the electrically operated vanes provides favorable conditions for the operation of the relay-relay circuit. The annual economic effect from the introduction of an elec- tric one of the claimed design with a power of 100 kW is more than 10 thousand rubles. 1. Three-phase salt per bath containing frame, intermediate casing lining of intermediate casing, three electrodes arranged horizontally and parallel with each other in the bottom part of the bath and sealing the electrodes, in order to reduce heat losses and material consumption of the electrodes the electrodes are installed at different levels so that in the cross section their longitudinal axes are located on the tops of an equilateral triangle, while one of the electrodes is connected to the current lead from the opposite end of respect to the other electrodes. 2. The bathtub according to claim 1, about the fact that the bath is provided with sleeves rigidly fixed on the furnace frame, connected to the cold ends of the electrodes by means of a threaded joint. Sources of information taken into account in the examination 1. The author's certificate of the USSR I 782188, cl. C 21 O 1/46, 1978. 2. Authors, the certificate of the USSR 663134, cl. C 21 D 1/46, 1977.  / o / WUUU //% o / o / / FL / s /% /% AA 4c /%. 15 . "