SU1152900A1 - Concrete duct with electric heating of concrete mix - Google Patents

Abstract

CONTAINER WITH ELECTRIC HEATING CONCRETE MIXTURE, comprising a housing with an insulated inner surface in the electric heating section and three strip electrodes evenly arranged on it along a helical lins, each of which is connected to one of the three-phase alternating current phases, characterized in that, in order to reduce energy consumption, electrodes made with a width of 0.3 - 0.35 inner diameter of the housing.

Description

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The invention relates to pipeline transport, in particular to the design of concrete pipelines for transporting and simultaneously electric heating of the concrete mix.

Known betonovod with electric heater, comprising a housing with an insulated inner surface and evenly placed on it along a helix electrodes

The disadvantage of this device is the uneven heating of the mixture over the cross section of the pipeline.

Also known concrete pipe with electric heating of the concrete mixture, comprising a housing with an isolated inner surface on the section of electrical heating and evenly located on it through a helical line three strip electrodes, each of which is connected to one of the phases of three-phase alternating current,

A disadvantage of the known device is the high energy consumption associated with uneven heating of the mixture.

The purpose of the invention is to reduce energy consumption.

The goal is achieved by the fact that in electric-heated concrete mixers a concrete mixture comprising a housing with an insulated internal surface on a section of electrical heating and three strip electrodes evenly spaced along it along a helical line, each of which is connected to one of the three-phase AC phases, are wide with width equal to 0.3-0.35 internal diameter of the housing.

Figure 1 shows schematically the proposed betonovod general view; figure 2 is the same cross section; on fig.Z - the same, longitudinal section; figure 4 - temperature profiles of the concrete mixture over the cross section of the housing with different relative width of the electrodes.

Concrete pipe consists of a housing 1 with an inner surface 2 on which electrodes 3 are insulated at the electric heating site. The insulation can be performed as a separate dielectric tube. The electrodes are fastened by means of bolts 4, nuts 5 and washers 6, and the electrical insulation from the casing is 10, filled with dielectric washers 7. A vibrator 8 can be mounted on the body of the concrete conduit. Electric heating sections can be made as separate links.

The device works as follows.

With the passage of the concrete mixture, the electrodes 3 under voltage are closed. Electric

The current passing through the concrete mix heats it according to the law of Joel, Lenz. Introduction of electrodes with a width of 0.3-0.35 of the internal diameter of the housing allows for uniform heating of the mixture over the cross section of the concrete pipe and thereby reducing energy consumption. Electrodes 3 are not brought to the ends of the electrically heated section for a distance of several

30 is greater than the distance between the electrodes, based on the condition of exclusion of short-circuit operation between the electrodes and the housing. With an electrode width of 0.3350, 35 of the inner diameter of the housing 1, the minimum allowable distance between the electrodes and the end of the link is 0.8-0.9; internal diameter. In order to eliminate direct electric effects (overheating, cement formation, etc.), a vibrator 8 can be mounted on the pipeline.

Use of the invention permits 45

It does not affect the speed of heating of the concrete mix, increase the uniformity of heating over the cross section of the concrete pipe, and reduce energy consumption.

Claims (1)

CONCRETE CONDUCTOR WITH ELECTRIC HEATING CONCRETE MIXTURE comprising a housing with an insulated inner surface at the electric heating section and three strip electrodes evenly spaced on it by a screw lens, each of which is connected to one of the phases of three-phase alternating current, characterized in that, in order to reduce energy consumption , the electrodes are made with a width equal to 0.3 - 0.35 of the inner diameter of the housing.