SU912613A1 - Pneumatic screw pump - Google Patents

Description

(54) PNEUMATIC SCREW PUMP

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This invention relates to pneumatic conveying in various industries, such as mining, construction.

A pneumatic screw pump is known, comprising a housing with a loading neck, mounted in the housing of the screws, an air extraction chamber arranged in the housing, a screw covering in the area between the shaft sealing assembly and the charging opening, an air outlet pipe connected to said chamber, and a mixing camera 1.

A disadvantage of the known pump is that part of the compressed air rushing from the mixing chamber into the casing enters the feed neck and causes a decrease in pump performance due to uneven flow of material from the feed neck, lower average load filling coefficient of the screw and reduced reliability of the transport process.

The purpose of the invention is to improve the performance of the pump.

The goal is achieved by the fact that the pump is provided with an intrinsic compactor of the transported material installed in the loading neck.

FIG. 1 shows the proposed pneumatic screw pump, a general view; in fig. 2 -, section A-A in FIG. one.

 The pump includes a housing 1 with a filling neck 2 and a casing 3, a shaft 4 with screw 5 fixed on it, a shaft seal assembly 6 of the shaft 4, a mixing chamber 7, an air extraction chamber 8 connected to the air outlet 10 by a discharge pipe 9, and a vibration compactor 10, ( for example, a deep vibrator (I-116) installed in the loading neck. Pneumatic screw pump works in the following way.

Transported material enters

 in the loading neck 2, where under the action of the vibration exciter 10 it moves in a dense layer and, falling into the interturn space of the screw 5, receives an offensive movement in the direction of the mixing chamber 7

20 with simultaneous rotation. The material entering the interturn space of the screw 5, under the action of centrifugal forces, moves in the form of an annular layer. Before entering the mixing chamber 7 ring

the layer of material under the force of pressure of compressed air and the force of pressure of the check valve is transformed into a moving porous plug; which, entering the mixing chamber 7, is destroyed, the material is mixed with compressed air and carried into a transport pipeline (not shown). The compressed air, which is blown out of the mixing chamber 7 through the cargo porous plug, moves in the cavity between the outer cylindrical surface of the screw 5 and the annular layer of material to the chamber 8 for air extraction. This air moves in the area of the loading neck 2 without breaking through to it, which is prevented by the material entering the loading neck and compacted in it by the vibrating compactor 10. In chamber 8, where there is no dense layer of material, the air is unobstructed, but enters this chamber. In chamber 8, having a large cross-sectional area, the air velocity drops and particles separate from it, are captured by turns of the screw 5 and move into the mixing chamber 7. The air, rising through chamber 8, enters the socket 9 and further into the system dust removal (not shown).

Compressed air, which bursts out of the compaction unit 6 of the shaft 4, also enters the chamber 8, then through the pipe 9 - into the dedusting system.

The proposed implementation of the pump eliminates breakthroughs of compressed air from the mixing chamber and the shaft seal assembly

into the loading neck and thus ensures a uniform outflow of material, increases the average filling factor of the screw material, increases the reliability of the process of pneumatic transport. All this provides an increase in the performance of pneumatic screw pumps by 20-25%. The economic efficiency from the implementation of the invention only in the packing plant of the Mikhailovsky GOK is about 12 thousand rubles. in year.

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Claims (1)

Invention Formula A pneumatic screw pump comprising a housing with a charging neck, an auger mounted in the housing, an air extraction chamber arranged in the housing, covering the tongs between the seal of its shaft and the charging mouth, an air outlet connected to the said chamber, and a mixing chamber characterized by that in order to increase productivity, it is equipped with a vibrating compactor of the transported material installed in the loading neck. Sources of information taken into account in the examination of 1 USSR Author's Certificate No. 652067, cl. B 65 G 53/48, 1977 (prototype).