RU204279U1 - Air distribution device - Google Patents

Abstract

The utility model relates to installations for purification of liquids by filtration through bulk materials, namely, to the elements of drainage and distribution systems of the collector-beam type, and can be used for all types of filters used in water supply, chemical water treatment in power engineering, additional wastewater treatment and other industries. industry. The air distribution device is made in the form of a perforated pipe with a connecting part and an end element. The perforation is made in the form of two rows of holes located along the pipe, closed by grooves with slotted holes, with a width less than the dimensions of the filter material. Each groove has an arcuate cross-section. The holes are located in one longitudinal half of the pipe. The utility model provides an increase in the efficiency of air bubbling.

Description

The utility model relates to installations for purification of liquids by filtration through bulk materials, namely, to the elements of drainage and distribution systems of the collector-beam type, and can be used for all types of filters used in water supply, chemical water treatment in power engineering, additional wastewater treatment and other industries. industry.

Known air distribution device (patent RU2664527, selected as a prototype), made in the form of a pipe having a connecting part and an end element, with perforations made in one row along the pipe, closed by a trough with slotted holes with a width less than the filter material. In the places of perforation in the inner part of the pipe, nozzles are installed

The disadvantages of the known device are a narrow zone of air bubbling, due to the fact that the pipes are primarily adapted for water distribution, and contain the number of slotted holes in the tape required for water flushing, designed to create a standard pressure loss in the drainage distribution system when flushing with water ( up to 7m water column), and are not designed to create the necessary pressure loss during air flushing created due to much higher air outflow rates from the slotted holes (the air outflow rate from them is small 1-4 m / s, instead of the required 45-50 m / s (Manual to SNiP. 2.04.02-84), and for uniform distribution of air along the pipe, special fittings installed in the pipe frame are used: the air rises vertically above the perforations, limiting the air bubbling zone by the area of the perforated linings.

The technical task of the utility model is to increase the efficiency of air bubbling.

The technical result is achieved in an air distribution device made in the form of a pipe with perforation, having a connecting part and an end element. The perforation is made in the form of at least two rows of holes located along the pipe, closed by grooves with slotted holes, with a width less than the dimensions of the filter material. Each groove has an arcuate cross-sectional shape. The holes are located in one longitudinal half of the pipe.

The utility model is illustrated by drawings:

fig. 1 - air distribution device, cross section;

fig. 2 - air distribution device, side view and partial longitudinal section;

fig. 3 - air distribution device, located in the filtering load.

The air distribution device is made in the form of a pipe 1 with perforation 2, made in the form of at least two rows of holes 2 located along the pipe 1, mainly evenly (at equal distances between the holes 2 in one row), for uniform distribution of air along the entire length pipes 1. The diameter of the holes 2 depends on the required intensity of air flushing, and is determined by calculation. Pipe 1 can be made from polymeric materials (PE, PVC, polypropylene, etc.), and from metals and alloys, including corrosion-resistant ones.

The distribution system of the collector-beam type consists of air distribution devices lying in one plane and evenly spaced over the area of the filtering unit. On one side, the pipes 1 are hermetically connected to the manifold 7, and on the opposite side, they are plugged. Pipe 1 has a connecting part 3, for example, on which a thread is made for connecting to a manifold (flange connections can also be used, fit on a cone followed by welding with an intermittent seam, continuous welding, threaded couplings, through a cap nut, using quick couplings, compression couplings ), and end element 4, made in the form of a sealed plug.

Perforation 2 along the pipe is closed by grooves 5 with slotted holes 6, with a slot width smaller than the size of the filtering material (less than its minimum fraction), due to which the internal cavities of the air distribution device are not clogged with filtering media (sand). Each groove 5 has an arcuate cross-sectional shape. At the stage of air flushing, air is supplied to pipe 1 and, due to resistance in holes 2, is evenly distributed along the entire length of pipe 1. This allows air to be evenly distributed over the area of the filtering structure and increases the efficiency of air bubbling. The size and number of slots 6 are selected in accordance with the hydraulic calculation - depending on the filtration area and the size of the filter material fractions, the required intensity of air flushing. The arcuate shape (for example, the shape of a segment of a circle or an ellipse) increases operational reliability, avoiding accidental damage to the system when overloading the filter layer. The gutter is plugged at the beginning and end on pipe 1 and can be made in the following versions: made of sheet steel (corrosion-resistant) with slots made on it, located both along and across the pipe generatrix by stamping or notching, with slots in the form of visors with one (type "blinds") or two slots ("bridge"), as well as other suitable shapes or combinations thereof; methods of laser processing, electro-erosion processing, punching, etc., in the form of flat holes or slots in the form of a line and any other geometric shapes. The groove 5 can be attached to the metal pipe 1 in various ways - by welding, resistance welding, rivets, screws or in another way. The gutter can be fastened to the polymer pipe 1 in various ways: by fitting into grooves followed by clamping with clamps, dovetail fastening, fastening to rivets, self-tapping screws, or in another way.

Holes 2 are located predominantly in one longitudinal half of the pipe, so the angle α between holes 2 from different rows is less than 180 degrees (angle α is the angle formed by the radii drawn from the center of the pipe 1 to the rows of holes 2, as shown in Fig. 1) ... Due to this, when installing a drainage system in the loading 8 (for example, sand), the rows of holes 2 can be oriented downward. Due to this arrangement of the holes 2 and, similarly, the position of the slotted holes 6, at an angle a of about 90 degrees, the total area of distribution of the air coming out of the slotted holes 2 by jets parallel to the longitudinal axis of the pipe 1, downward directed away from the pipe 1, increases, which increases the efficiency of air bubbling and allows the pipes 1 of adjacent air distribution devices to be located in the system at large distances from each other. The use of such air flushing significantly reduces the cost of water treatment as a whole due to the saving of flushing water.

At the end of the filtration cycle, the washing cycle of the filtering load 8 begins. At the first stage of washing, air is fed through the manifold 7 into the cavity of pipes 1, from where it enters the load 8 through holes 2 in pipes 1 and slotted holes 6. At this stage of washing, the hydraulic resistance is equalized loading 8 over the area of the structure and the separation of contaminants accumulated during the filter cycle from the surface of the loading grains.

Joint water-air flushing is possible, when air is supplied simultaneously with water (through separate drainage and distribution pipes) into loading 8 for its regeneration and washing, and removal of contaminants into the washing troughs 5.

Claims (2)

1. An air distribution device made in the form of a pipe with perforation, having a connecting part and an end element, characterized in that the perforation is made in the form of two rows of holes located along the pipe, in one longitudinal half of the pipe, closed by troughs with slotted holes, with a width less the size of the filter material. 2. An air distribution device according to claim 1, characterized in that each trough has an arcuate cross-sectional shape.

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