RU1773503C - Device for extracting narrow powder fraction from aerosol - Google Patents

Abstract

The invention relates to a technique for the production of powders of a finely dispersed composition and m. used in powder metallurgy, chemical and electronic industries. The purpose of the invention is to improve the quality of fractionation of the powder. The device contains a cylindrical body 1 of the vortex chamber (VK), a snail twist with an inlet pipe and a snug spinner 4 with an outlet pipe and an outlet with a rounded edge 6. A bottom wall 7 of the VK is attached to the bottom 1, to which the hopper-precipitator 9 is fastened with latches. The housing cover is the cover 10 of the spinner 4, to which the lower edge 12 is attached with a bolt 11. The covers 10, 12 form a smooth inner surface 13 of the VK. The outer edge of the lid 12 and the inner edge of the bottom wall 7 of the VK form an annular gap 14. The cavity of the bunker-precipitator 9 is connected to B To several holes 15, joined with the slots 16. The finely dispersed fractionation of the powder is carried out in the field of two opposing forces - centrifugal and in the viscous drag of the carrier gas. Particles of the recovered fraction are poured into the hopper 9 through the annular gap 14. 1 s.p. f-crystals, 2 silt.

Description

The invention relates to a technique for the production of powders of a finely dispersed composition and can be used in powder metallurgy, chemical and electronic industries

The purpose of the invention is to improve the quality of fractionation of the powder.

In FIG. 1 shows a longitudinal section of a device; in FIG. 2 is a cross-section along AA in FIG. 1.

A device for extracting a narrow fraction of the powder from aerosols contains a vortex chamber body 1 with a snail twist 2, an inlet pipe 3, a snail spinner 4, an outlet pipe 5, an outlet with a rounded edge 6. Bottom to the housing 1

the lower wall of the vortex chamber 7 is attached, the hopper-precipitator 9 is attached to it by two spring latches 8. On top of the casing 1 is the cover 10 of the spinner 4. The lower cover 12 of the vortex chamber is attached to it with a bolt 11. The outer surfaces of the lid 12 and the lid 10 untwist the smooth inner surface 13 of the vortex chamber. The outer edge of the lid 12 and the inner edge of the lower wall of the vortex chamber 7 form an annular gap 14. The cavity of the precipitating hopper 9 is connected to the vortex chamber by several openings 15 joined with slot 16.

The device operates as follows.

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Aerosol enters the snail spinner 2 through the inlet pipe 3 at a constant speed.

A converging vortex flow is formed. The particles of the fraction extracted from the powder appear in the field of action of two opposing forces - centrifugal and viscous drag of the conveying gas. When these forces are balanced, the particles move in equilibrium orbits. The radius of the annular gap 14 is equal to the radius of the equilibrium orbit of the particles averaged over the diameter d of the extracted fraction. Particles of the recovered fraction are concentrated over the annular gap 14 and fall into it. A radial pressure gradient existing in a converging vortex stream causes a pressure differential between the annular gap 14 and the outlet. This differential pressure creates a small parallel aerosol flow through the annular gap 14, the hopper cavity sediment 9 and the openings 15. The concentrated aerosol enters, rotating, into the annular gap 14 and falls down along the wall of the precipitating hopper 9. In this case, the particles of the powder are thrown by centrifugal force onto the wall of the precipitating hopper and then are poured onto its bottom. The carrier gas leaves the cavity of the precipitating hopper 9 through the openings 15.

In order to increase the productivity of the device by suctioning a fractionated concentrated aerosol into the precipitating hopper by using a radial pressure gradient in a converging vortex stream, attaching the cavity

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the vortex chamber is connected to the cavity of the hopper-precipitator channels. These channels are made at the junction of the fairing and the cover of the spinner and have an inclination in the direction of movement of the aerosol at the exit to the axial cavity of the vortex chamber.

Claims (2)

1. A device for extracting a narrow fraction of the powder from an aerosol, including a vortex chamber with a snail spinner and a snail spinner, an annular gap made in the lower wall of the vortex chamber with a hopper-settler located below it, a loading device for supplying the source power and separation medium to swirl chamber, characterized in that. in order to improve the quality of fractionation of the powder, it is equipped with a hollow cowl with a round top cover located at the level of the lower wall of the vortex chamber, while the round cover is placed in the outlet of the vortex chamber, the snitch is made with a round cover that is combined with the round upper cover of the hollow cowl and the lateral surface of the hollow fairing smoothly interfaced with the snail twist. 2. The device according to claim 1, characterized in that in the round lid of the hollow fairing there are channels rotated in the direction of aerosol movement and communicating the axial region of the precipitating hopper with the axial zone of the vortex chamber. I AM UJ1 Nneah ...-%, -. X -.- w O Fig. I