SU395045A1 - VPTB - Google Patents

Description

one

The invention relates to the field of agricultural machinery, in particular, to air distribution plants for drying hay, straw, flax straw and other agricultural crops in a layer.

Installations for the drying of agricultural products in the bed are known by the method of active ventilation, consisting of a main channel and side grates, communicating with the main channel by means of side shears. In such installations, valves are arranged to improve the air distribution along the grate in the lateral shafts of the main channel. If it is necessary to direct a large amount of air to one of the sides, the corresponding valve opens.

However, such an installation is very complicated, it is inconvenient to control multiple valves; Moreover, with such a control system, it is almost impossible to achieve a uniform distribution of air flow under the grate bars, since the adjustable valves have only two fixed positions, "Open or" Closed.

In the proposed installation, in contrast to the known in the central channel of the installation, at least one throttle device is placed, adjusting its live section of the channel, made, for example, in the form of a blind.

This installation allows you to smoothly throttle the air flow in the end of the channel and thereby more evenly distribute the mass of air along the length of the entire drying unit.

FIG. 1 shows schematically the described installation, the plan; in fig. Part 2

central channel with a device for adjusting its living cross section, longitudinal section.

The installation consists of a central channel 1, side grates 2, a fan 3 and a throttle device 4 for adjusting the living section of the main channel.

The grates 2 are raised above the floor level with the help of cross bars 5 and under the whole layer of the product being dried.

form a space communicated with the main channel / by means of the lateral longitudinal shells a.

The throttle device 4 is placed inside channel 1 approximately in the first half.

its length. It can be made, for example, in the form of a louvered grill 6, controlled by a cable 7 and a gear sector 8 located directly above the fan 3 on the outside of the installation (

ra). To maintain the louver shutters in covered positions, each axis can be provided with spiral-type springs (not shown) or the common control valve of the flaps is spring-loaded with an ordinary cylindrical spring 9.

The installation works as follows.

The air supplied by the fan 3 through the side slots of the main channel / ponat under the grates 2, and from there into the layer of the dried product. When laying the first layer, therefore, a slight aerodynamic drag of the latter, the bulk of the air tends to the end dried part of the channel. Therefore, the shutters of the louvers 6 are installed in a closed position, as a result of which the air flow is choked, in the end part of the channel 1 the pressure drops, and in the front part it increases. As a result, a larger amount of air is supplied under the front part of the grate 2 and its distribution along the length of the whole grate is improved.

With an increase in the height of the stack, the aerodynamic resistance of the layer to the purge increases, which creates conditions for a more uniform natural distribution of air along the entire gap a. Now the channel cross-sectional area can be gradually increased by opening the louver 6.

By predetermining for each particular product the position of the louver depending on the layer thickness and the deposition of the graduation of these positions on the toothed sector 8, it is possible to conveniently and qualitatively maintain an approximately uniform distribution of air under the entire grid in the process of laying the entire layer of material.

Subject invention

A plant for drying agricultural products in a layer by means of active ventilation, comprising a central channel and a grate communicating with the channel through a longitudinal slit, characterized in that, in order to increase the uniformity of air distribution along the entire length of the longitudinal slit during the formation of a layer of material, At least one throttle device is installed in the central channel to regulate the living cross section of the channel, made, for example, in the form of a blind.

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