RU2322297C2 - Grain material heating system - Google Patents

Abstract

FIELD: agricultural engineering.

SUBSTANCE: invention relates to enterprises for storing and processing of grain and it can be used for heating grain in processing. Proposed system for heating grain material has auger conveyor with housing of U-shaped section, and cover. Auger is installed in housing for rotation. Volumetric electric heaters arranged in row on outer surface of housing are also U-shaped in section, and row of flat electric heaters is arranged on cover. Volumetric electric heaters and flat electric heaters are connected in parallel. Electric heaters are made on butyl rubber base and are provided with conducting layer with electrodes in insulating layer. Each volumetric electric heater has electrodes arranged along its generating form. Electrodes are arranged at equal distance form each other, and extreme electrodes are located in places of connection of cover. Auger conveyor has charge and discharge ports, and auger of auger conveyor is provided with drive.

EFFECT: improved reliability of grain material heating system, provision of uninterrupted operation.

2 dwg

Description

The invention relates to the field of agriculture, and in particular to equipment for grain storage and processing enterprises, and can be used to heat it during processing.

A known system for heating grain material, comprising a device for moving grain material and a heater, the device for moving grain material is made in the form of a vertical shaft, divided into upper and lower sections, and the heater is formed by steam chambers of the upper and lower sections and is made in the form of annular steam pipelines (see the book by A. Ya. Sokolov. Technological equipment for grain storage and processing enterprises. - M., Kolos, 1975, p.207-210).

A disadvantage of the known technical solution is that it is energy intensive and metal intensive.

A known system for heating grain material containing a device for moving grain material and a heater, the device for moving grain material is made in the form of a vertical shaft with tubular guides for grain, and the heater is made in the form of annular steam lines located between the tube guides and the shaft body (see book. Technology and equipment for flour and cereal and animal feed production. - M., Kolos, 1979, p. 108-110).

The disadvantage of this system for heating grain material is also the significant energy consumption due to the processing of the grain material with steam, and the metal consumption due to the implementation of the device for moving the grain material in the form of a vertical shaft with tubular guides for grain, and the heater in the form of annular steam ducts located between the tubular guides and mine body.

The closest set of essential features to the claimed (prototype) is a system for heating grain material containing a screw conveyor having a housing in which the screw is rotatably placed, and heating elements repeating its shape located on the outer surface of the screw conveyor housing, moreover, in the cup is concentrically fixed to the case, the case and the cup have slots along the helix, the heating elements are additionally placed on the inside of the cup, and the screw is made ene as a spring, located in the gap between the housing and the glass (see. specification of a patent RF №2179067, appl. 16.06.2000, publ. 10.02.2002, tml. V02V 1/00).

The disadvantage of this system for heating grain material is its low reliability due to the implementation of the screw in the form of a spring located between the body and the glass. In addition, it does not allow ensuring uninterrupted operation if it is necessary to replace heating elements located on the inside of the screw conveyor, since their replacement requires stopping the system to heat up the grain material and the entire technological process.

The problem to which the present invention is directed is to significantly increase the reliability of the system for heating grain material and to ensure the possibility of its smooth operation and the entire process if it is necessary to replace the heating elements.

The problem is solved in that in a system for heating grain material containing a screw conveyor having a housing in which the screw is rotatably placed, and heating elements repeating its shape located on the external surface of the screw conveyor housing, according to the invention, on the external surface of the screw housing a conveyor, in a cross section made of a U-shape and having a cover, a series of parallel-mounted volumetric electric heaters similar to the case of the mold is located, made s based on butyl rubber and having encapsulated in insulating layers of the electrically conductive layer with electrodes arranged along a generatrix of U-shaped electric heaters bulk and on the housing cover of the screw conveyor are arranged parallel planar electrical heaters included, also made on the basis of butyl rubber with an inner conductive layer.

Salient features: design of heating elements in the form of a series of parallel-connected butyl rubber-based electric heaters having an electrically conductive layer encapsulated in insulating layers, design of a screw housing and volume electric heaters in a U-shaped section, the presence of electrodes in them, as well as the arrangement of electrodes in the conductive layer along forming a U-shaped volumetric electric heaters and placing on the cover of the auger conveyor housing flat electric heaters based butyl rubber, also having an internal electrically conductive layer, distinguish the claimed invention from its closest analogue.

Significant reliability of the system and the possibility of uninterrupted operation is due to the implementation of heating elements in the form of a series of parallel-connected butyl rubber-based electric heaters having an electrically conductive layer encapsulated in insulating layers.

The reliability of the system and the possibility of its uninterrupted operation and the entire process if heating elements need to be replaced are also due to the fact that the volume electric heaters in the section are U-shaped, repeating the shape of the outer surface of the screw conveyor housing, as well as the fact that the electrodes are located in the electrically conductive layer along the generatrix of the U-shaped volumetric electric heaters.

The reliability of the system is also due to the placement of parallel-connected flat electric heaters also based on butyl rubber on the cover of the screw conveyor housing.

The invention is illustrated by drawings, where:

figure 1 schematically shows a General view of the system;

figure 2 is the same, a section along aa.

The system for heating the grain material contains a screw conveyor having a housing 1 made in a U-shaped section and a cover 2. In the housing 1, a screw 3 is rotatably placed. On the outer surface of the housing 1 there are a number of volumetric 4 electric heaters, also having a cross section U-shaped, and on the cover 2 there is a row of flat 5 electric heaters. Volume 4 electric heaters, as well as flat 5, are connected in parallel. Electric heaters 4 and 5 are made on the basis of butyl rubber and have an electrically conductive 7 layer with electrodes 8 located in the insulating 6 layer. Each volumetric 4 electric heater has electrodes 8 located along its forming shape. The electrodes are installed at an equal distance from each other, and the extreme ones are located at the junction of the cover. The screw conveyor has loading windows 9 and unloading 10, and the screw 3 of the screw conveyor is equipped with a drive 11.

A system for heating grain material works as follows.

On parallel-connected electric heaters 4 and 5, mounted on the outer surface of the housing 1 and the cover 2 of the screw conveyor, respectively, the operating voltage is applied and the case 1 and the cover 2 of the screw conveyor without grain material are heated to a predetermined temperature. Turn on the drive 11 of the rotation of the screw 3 and in the loading window 9 serves the grain material. Grain material transported by the screw 3 under the influence of heat coming from volumetric multi-electrode U-shaped electric heaters 4 to the housing 1 of the screw conveyor, and from flat 5 to the lid, is heated. When moving the screw 3, the grain material is mixed and uniformly heated throughout the volume. The choice of the number of electrodes 8 for volume 4 and for flat 5 electric heaters and their connection to 220 V or 380 V is carried out according to a certain method in accordance with the required heating power.

Thus, the use of the invention in comparison with the closest analogue allows to increase the reliability of the system for heating grain material and to ensure the possibility of uninterrupted operation.

Claims (1)

A system for heating grain material containing a screw conveyor having a housing in which the screw is rotatably placed and heating elements repeating its shape located on the outer surface of the screw conveyor housing, characterized in that on the outer surface of the screw conveyor housing made in section U -shaped and having a cover, a series of parallel-connected volumetric electric heaters similar to the case body, made on the basis of butyl rubber and having an psulirovanny insulating layers in the electroconductive layer with electrodes arranged along a generatrix of U-shaped electric heaters bulk and on the housing cover of the screw conveyor are arranged parallel planar electrical heaters included, also made on the basis of butyl rubber with an inner conductive layer.

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