RU2520U1 - JET MILL - Google Patents

Abstract

A jet mill containing devices for loading and unloading of crushed material, an ejector device including nozzles for supplying working gas and crushed material, a booster tube, a shock plate and a vortex grinding chamber mounted at the outlet end of the booster pipe coaxially with it, characterized in that it is provided with an additional coaxial the booster tube is an annular grinding chamber, and the booster tube is made in the form of two sequentially arranged parts, while the shock plate and the additional grinding chamber are installed Lena between parts accelerating tube.

Description

Cl, ZhI UDC 621..8)

The utility model relates to the technique of dry jet grinding of bulk materials and can be used to obtain fine powders in the chemical, construction, and other industries.

Known vertical jet mill containing a device for loading and unloading of crushed material, an ejector device with a nozzle for supplying compressed gas and a pipe for supplying crushed material, an accelerating tube and a shock plate / 1 /. The disadvantage of this mill is that it implements only the percussion mechanism for the destruction of the crushed material, which does not allow drying, fine grinding of viscous materials.

Also known is the jet mill closest in its technical essence to this utility model, which contains devices for loading and unloading of crushed material, an injector device including nozzles for supplying different gas and crushed material, a booster tube, a shock plate and a swirl grinding chamber mounted at the outlet end of the booster pipe coaxially last / 2 /.

However, in this jet mill, the energy of the compressed gas supplied to the ejector device is not fully used for grinding the material.

The purpose of this utility model is to reduce energy consumption due to a more complete use of the energy of compressed gas.

This goal is achieved by the fact that the jet mill containing the device for loading and unloading of the crushed material, an ejector device including the nozzles for supplying working gas (air) and the crushed material, the booster pipe, the shock plate and the vortex grinding chamber mounted on the output end of the booster pipe coaxially with the last is equipped with an additional coaxial booster tube with an annular grinding chamber, and the booster tube is made in the form of two successive parts, while the shock plate and the additional The grinding mill is installed between the parts of the booster pipe.

Ink mill

The essence of this model is illustrated by drawings, which show:

FIG. 1 is a longitudinal view of a jet mill;

FIG. E is a section AA in FIG. 1;

figs; 3 is a section BB in FIG. 1.

The jet mill comprises a loading device 1, an ejector device 2 with a nozzle 3 for supplying compressed gas and a nozzle 4 for supplying crushed material, an accelerating pipe consisting of two consecutive cups 5 and 6, a shock plate 7 and a vortex grinding 8. In the chamber 8, nozzles 9 are fixed supply of compressed gas oriented at acute angles a (0 ° and 90-) to radial directions. The lower part 6 of the booster pipe is provided with a guide on the rear 10, and the shock plate 7 is mounted on the profiled base 11. The discharge device of the mill includes a channel 12 between the housing 13 and part b of the booster pipe with an arm 14, a separation wall 15 and branch pipes 15 and 17 from the mill of crushed material of fine and coarse fractions, respectively. The nozzles 16 and 17 are connected to devices for separating the crushed material from the working gas, for example, cyclones and filters (not shown in the drawings). Moreover, a larger fractional material obtained from the pipe 16 can be unloaded as a finished product or returned to the charging device 1 for re-grinding.

Between the upper 5 and lower 6 parts of the booster pipe, an additional annular grinding chamber 18, coaxial to the booster pipe, is fixed to the bracket 14 with the outlet ring opening 19.

Compressed gas is supplied to nozzles 3 and 9 from a common SO receiver through control valves S1 and 2S along lines 23.

The jet mill operates as follows.

The crushed (source) material is supplied to the charging device 1, and the compressed gas is supplied to the injector device 2 through the line 23. Gas flowing out through the nozzle 3 carries away the crushed material, which through the nozzle 4 enters the upper part 5 of the booster pipe, In the booster pipe of the particle of material are accelerated by the gas flow and, leaving it, are crushed on the impact plate 7. After hitting the plate, small pieces of material are carried away by the gas flow through the annular hole 19 into the lower pipe 6, and larger ones that are not destroyed after the first impact on the plate 7 crossing over

the inertia of the hole 19 falls into an additional grinding chamber 18. A toroidal vortex 24 is formed in this chamber, and the particles falling into it are crushed due to friction between themselves and against the chamber walls, as well as as a result of repeated impacts on the plate 7. After an additional acceleration of the material particle through the annular gap between the nozzle 10 and the base 11 of the shock plate enter the vortex grinding chamber 8. Here they are under the action of the jets flowing from the nozzles 9, acquire peripheral speed and are additionally crushed by mutual collisions s and of the lateral wall of the friction chamber 8. In this process, due to the action of centrifugal force larger chvztitsy discarded to the peripheral portion of the chamber, and small chadztitsy entrained in the gas flow passage 12 of the discharging device. In the channel 12, due to the vortex flow movement, relatively large particles of material are displaced to the inner wall of the housing 13 and fall into the annular channel between the housing and the separation wall 15, from where they enter the pipe 17. Smaller particles of the crushed material fall into the space between the partition 15 and the bracket 14 , from where they are carried out with a gas flow into the pipe 16.

From the nozzles 16 and 17, a gas suspension of the crushed material enters the device for separating the material from the gas, for example, cyclones or filters, or cyclones and filters connected in series. In this case, the crushed material from the separation devices connected to the pipe 16 is discharged as a finished product, and the material with a larger fractional composition from the separation devices associated with the pipe 17 can either be returned to re-grinding or used as a finished product.

Due to the separation of the booster pipe into two sequentially fixed, the installation of a shock plate between these parts, as well as the introduction of an additional grinding chamber placed between the parts of the booster pipe into the jet mill design, more complete use of the energy of compressed gas supplied to the ejector device for grinding the material, which provides, ceteris paribus, a reduction in energy consumption in a given jet mill in comparison with well-known technical solutions.

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Claims (1)

A jet mill containing devices for loading and unloading of crushed material, an ejector device including nozzles for supplying working gas and crushed material, a booster tube, a shock plate and a vortex grinding chamber mounted at the output end of the booster pipe coaxially with it, characterized in that it is provided with an additional coaxial the booster tube is an annular grinding chamber, and the booster tube is made in the form of two sequentially arranged parts, while the shock plate and the additional grinding chamber are installed Lena between parts accelerating tube.