SU1384889A1 - Aspiration installation - Google Patents

Abstract

The invention relates to a technique of ventilation and allows to increase the reliability of the installation. On the upper part of the horizontal collector 2, connected to the fan, are placed air ducts (BB) 3 local suction, and in the lower part there is a longitudinal slit 4. Dust collector 7, 4 located under slit 4, is made in the form of conical upper and lower BB 8 and 9. BB 8 and 9 have, in cross-section (PS), respectively, larger and smaller diameters, expand in the direction of flow and communicate with each other. The collector is connected to the explosive 8 using a curved channel 10, the walls of which in the PS are outlined by arcs of concentric circles. BB 8 and 9 are connected respectively to the fine and coarse dust collectors. In any PS. The ratio of the diameters of the BB 9 to the BV 8 is 0.57-0.65. With this installation, not only reliable separation and trapping of coarse and fine dust is ensured, but also its reliable transportation by swirling streams to mc traps. 1C. f-ly, 3 ill. BUT . § (L

Description

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The invention relates to ventilation and can be used in aspiration installations.

The purpose of the invention is to increase the reliability of the aspiration system.

FIG. 1 shows a general view of the aspiration unit; in fig. 2 shows section A-A in FIG. one; in fig. 3 shows the node I in FIG. 2

The aspiration installation contains a horizontal collector 2 connected to the fan 1, having 3 local suction air ducts placed on its upper part and a longitudinal slit 4 in the lower part and fine dust collectors 5 and 6 dust collectors located under the slit 4, made in the form of conical upper 8 and lower 9 air ducts, having in the cross-sections, respectively, larger and smaller diameters, expanding in the direction of flow and communicating between each other, and the collector 2 is connected to the upper air duct 8 using a curved channel 10, the walls of which in cross section are arched by concentric arcs

Tei, the upper 8 and lower 9 ducts are connected respectively to the fine dust collector 5 and coarse 6 dust collectors. In any cross section, the ratio of the diameters of the lower 9 and upper 8 ducts is 0.57 ... .0.6

The aspiration system works as follows.

Under the effect of the vacuum created by the fan t, the air enters through the air ducts 3 local suction into the horizontal manifold 2. From the latter, the dusty air through curvilinear channel 10 enters the dust collector 7, made in the form of conical upper 8 and lower 9 air ducts. The passage through the curvilinear channel 10, coarse fractions of dust due to inertial forces are thrown onto the outer wall of channel 10, concentrating in a layer of thickness (0.25 ... 0.3) b, where b is the width of the curvilinear channel. At the entrance to the lower duct 9 of a smaller diameter, the gap width is (0.25 ... 0.3) b, which ensures the supply of air containing the largest dust.

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in the lower duct 9. The exit from the channel 10 into the lower duct 9 is tangential, the air acquires a rotational motion. The flow, thus twisted, transports the coarse dust separated from the air along the bottom 9 and the connecting ducts to the coarse dust collector 6. After cleaning, the air is blown out by the fan 1 to the atmosphere. A large part of the air flow, containing a small dispersed pip, enters through a gap of width (0.75 ... 0.7) b in the upper duct 8 of larger diameter, where a similarly swirling flow conveys fine dust to the fine dust collector 5, and then through the fan 1 to the atmosphere.

Thus, not only reliable separation and trapping of coarse and fine dust is ensured, but also their reliable transportation by swirling streams to fine and coarse dust collectors.

Claims (2)

1. An aspiration unit containing a horizontal collector connected to the fan, having local suction ducts placed on its upper part and a longitudinal slit in the lower part, fine and coarse dust collectors and a dust collector located under the slit, characterized in that, in order to increase reliability of operation, the dust receiver is made in the form of conical upper and lower air ducts having, in cross sections, respectively, larger and smaller diameters, expanding in the direction of flow and communicating with each other, and the collector is connected to the upper duct by means of a curved channel, whose walls in cross section are outlined with arcs of concentric circles, and the upper and lower ducts are connected respectively to the py m eulovitel fine and coarse. 2. The installation according to claim 1, about tl and is determined by the fact that in any cross section the ratio of the diameters of the lower to the upper ducts is 0.57-0.65. J n   / I / Jj I / h a: Fig.Z