SU1723424A1 - Air vent duct of cooling grain column - Google Patents

Abstract

The invention relates to the technique of drying grain and can be used in grain receiving plants and in agriculture to improve the operation of the cooling zones of operating shaft and recirculation grain dryers. The aim of the invention is to simplify the design of the insert, providing an increase in the flow of cooling air without the removal of grain from the mine. The air exhaust duct 1 of the cooling shaft of the zernosushilka contains a housing open below and with one of the ends with a longitudinal insert placed in it to stabilize the air flow, the insert is made in the area of a removable rectangular box 2 of a length I equal to 1 / 4-1 / 5 of the length I of the box open at the bottom and above, adjacent from the side of the open end 3 of the box 1 to its inner walls 7, and the lower edges of the box 2 are set below the lower edges of the walls of the box 2 / 3-2 / 4 the height hi of its vertical walls. The inner end wall 7 of the box 2 is made detachable from two adjacent and overlapping one another plates with relative movement across the width of the box 1, and the outer wall 5 is 1 / 3-1 / 4 lower than the rest of the walls and has a T-shaped bend 8 for fixing it in the box 1 and tightly inserting the insert on the wall of the shaft 4. The vertical part of the G-bend 8 has horizontal projections extending beyond the width of the open end of the box 1. 2 Cp. f-ly, 4 silt .. (L C VI go with CE

Description

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FIG.

The invention relates to the technique of drying grain and can be used in grain receiving plants and in agriculture to improve the operation of the cooling zones of operating shaft and recirculation grain dryers.

Known air distribution box for the cooling zone of the mine grain dryer, having inclined-vertical walls, divided by a diagonal partition along the entire length of the box into the upper and lower compartments, above its inclined walls, parallel to them, a triangular divider that forms channels with the walls to exit the exhaust air into the upper compartment.

The specified air distribution duct allows approximately 2 times increase in air consumption and to ensure a relatively high uniformity of grain blowing under the duct. The disadvantage is the comparative difficulty of making boxes and the impossibility of re-equipping typical boxes of existing grain dryers without removing them from the mine.

A well is known for a shaft grain dryer box with a longitudinal insert placed therein for stabilizing the gas flow. Moreover, the insert is made in the form of a profiled chute with a variable cross section increasing from the closed end of the duct to the open one used to exit the exhaust gases. The insert is attached with a flange at one end to the wall of the shaft, and the other - by means of a spacer - to the box.

The disadvantage of this discharge duct, adopted as a prototype, is the difficulty of manufacturing the insert and its fastening in the duct, which does not allow to convert the outlet duct without dismantling it.

The purpose of the invention is to simplify the design of the insert, ensuring an increase in the cooling air flow rate without removing the grain from the shaft, is achieved by the fact that the insert is made in the form of a removable rectangular box with a length AND equal to 1 / 4-1 / 5 of the length i of the box, open at the bottom and top adjacent the open end of the box to its inner walls, and the lower edges of the box are installed below the lower edges of the walls of the box 2 / 3-2 / 4 of the height hi of its inner walls.

The achievement of the goal is also facilitated by the fact that the inner end wall of the box is made detachable, from two adjacent and overlapping one another plates, with the possibility of relative movement across the width of the box.

The outer wall of the box is 1 / 3-1 / 4 lower than the height of the remaining walls and has an L-shaped bend for fixing it in the box and tightly hanging the box on

wall mine. The vertical part of the L-shaped bend has horizontal projections,

beyond the width of the frontal

window box that prevents failure

insert into the mine.

0 The height of the rear and side walls of the insert (50-55 mm) is determined by the height hi of the side walls of the box, i.e. the possibility of inserting the insert into the box. This is facilitated by the detachable structure of the inner end wall of the box, which makes it possible to reduce the width of the box when it is installed in the box and then expanded to the walls of the box. Lowering the lower edges of the box walls below the bottom walls of the box

0 by 2 / 3-2 / 4 the height hi of its vertical walls increases the area of the free section of the channel above the grain layer, which reduces the relative velocity of the gas and the possibility of carrying the grain out of the ducts.

5 Further lowering of the lower edges of the walls is difficult due to the box leaving the box. An increase in the length of the box is undesirable, since it has almost no effect on the permissible gas output rate from the box, at which no grain is removed from the mine.

Fig. 1 shows an air outlet box with an insert, a slit; figure 2 is a view along arrow A in figure 1; on fig.Z - section BB

5 in FIG. figure 4 - section bb In figure 1.

Air exhaust duct 1 of length I, height h with side vertical walls of height hi and width k between them has one open end 3 with a window, is installed in one of the walls 4 of the shaft and contains a longitudinal insert made in the form of a rectangular box 2 with face outer wall 5 and inner wall 7. The outer front wall has a L-shaped bend 8 with a horizontal section 9 and horizontal protrusions 10 on a vertical section. A layer 11 of processed grain is placed between the boxes (Fig. 1-4).

0 The air outlet box works as follows.

In preparing the dryer for operation, a box 2 for stabilizing the air flow is inserted into the box 1 through the window of the open end 3 in the wall 4 of the shaft. In this case, thanks to the split inner wall 7 of the box, it is possible, squeezing the side walls, to freely place box 2 in box 1, and then press the side walls of the box to the walls of the box. Box 2

fixed on the wall 4 of the shaft with a l-shaped bend 8. The upper horizontal platform 9 of the l-shaped bend 8 is tightly mounted on the bottom of the window of the open end 3 of the duct in the wall 4 of the shaft, and the vertical section of the l-shaped bend lowers along the wall 4 mines. On the other hand, the box 2 is pressed tightly against the wall 4 of the shaft with an end external wall 5. The horizontal protrusions 10 on the vertical portion of the L-shaped bend eliminate the possibility of insertion failure into the shaft and tightening it with grain.

After installing the air-stabilizing box in the box, the lower edges 6 of its walls fall below the lower edges of the vertical walls of the box 2 / 3-2 / 4 the height hi of its vertical walls at a distance of 1 / 4-1 / 5 the length of the I box. When the mine is filled with grain in this area, a channel for air passage is formed under the duct, the cross-sectional area of which is 22-44% larger than the channel section below the duct where box 2 is not installed. In addition, after installing the box, the threshold the walls of the shaft 4 to the lower edge of the end outlet box 3 of the duct, which also reduces the possibility of carrying the grain out of the mine, allows to increase the air flow in the duct.

When installing air exhaust ducts equipped with the proposed stabilizing insert, the air flow rate in the cooling shaft of the grain dryer increases by 30-50%, which increases the cooling efficiency of the grain after drying in

recycling grain dryers, reduces the cost of post-harvest handling and storage.

Claims (3)

1. Air exhaust duct of the cooling shaft of the zernosushilka, containing a housing open at the bottom and one of the ends with a longitudinal insert placed in it to stabilize the air flow, which is designed to simplify the design of the insert that provides an increase in cooling air flow without carrying out grain from the mine, the insert is made in the form of a removable rectangular box And 1, 4/1/5 length I of the box, open at the bottom and top, adjacent from the open end of the box to its inner walls, and the lower ones fittin g box mounted below the lower edges of the box walls 2 / 3-2 / 4 height hi its vertical walls. 2. The box according to claim 1, wherein the inner end wall of the box is made detachable from two adjacent and overlapping one another plates with the possibility of relative movement across the width of the box, and the outer wall is made on 1 (3-1 / 4) is lower than the height of the remaining walls and has an L-shaped bend for fixing it in the box and tightly inserting the insert onto the wall of the shaft. 3. A box according to claim 2, characterized in that the vertical part of the L-shaped bend has horizontal projections extending beyond the width of the open end of the duct. ®ig.2 Fig.Z FIG 4