RU111036U1 - CENTRIFUGAL-DYNAMIC AIR CLASSIFIER - Google Patents

Abstract

 An air centrifugal-dynamic classifier comprising a housing with a lid, a tangential nozzle for supplying the source material located in the upper part of the housing, a nozzle for outputting a fine fraction together with air flow, mounted on the housing cover, a nozzle for outputting a large fraction with an unloading device located in the lower part of the body, the working body, consisting of an upper disk with a Central hole in communication with the pipe for outputting a fine fraction together with the air flow, the lower disk and the blade ok located between the upper and lower disks on their peripheral part and interacting with the tangential branch pipe for supplying the source material, and the drive of the working body, characterized in that the classifier contains blades vertically and evenly mounted on the upper disk of the working body around its central hole and located in the lower part of a branch pipe for a conclusion of small fraction together with an air stream.

Description

The utility model relates to mechanical engineering, namely to air centrifugal classifiers with a rotating working body, and can be used in the construction, chemical, food and other industries for the separation of various bulk materials, mainly powders, by size into two fractions.

Known air centrifugal-dynamic classifier containing a housing with a lid, a pipe for supplying raw material, a pipe for outputting a fine fraction together with air flow, mounted on the cover of the body, a pipe for outputting a large fraction located in the lower part of the housing, a working body, consisting of the upper disk with a central hole in communication with the nozzle for outputting the fine fraction together with the air flow, the lower disk and the blades located between the upper and lower disks on their peripheral part And drive the working member. (Mizonov V.E., Ushakov S.G. Aerodynamic classification of powders. M: Chemistry, 1989 - P.59, Fig. 2.9).

However, this classifier does not provide a high efficiency of separation of the starting material by size due to the fact that part of the particles of the coarse fraction are removed from the classifier by air flow together with the particles of the fine fraction. This disadvantage is due to the fact that the movement of the source material together with the air flow in the separation zone of the material is complex. Some large particles collide with each other and acquire a significantly greater speed than the average particle speed of the starting material, which overcomes the separation zone of the material through the interscapular space and mixes with the fine fraction.

The objective of the utility model is to increase the separation efficiency of the starting material by eliminating the removal of coarse particles from the classifier by the air flow together with the fine fraction by imparting a twist in the fine flow air stream with a fine fraction in the nozzle to output the fine fraction together with the air stream.

The essence of the utility model is that to solve the problem by the specified technical result, an air centrifugal-dynamic classifier containing a housing with a lid, a tangential nozzle for supplying the source material located in the upper part of the housing, a nozzle for outputting a fine fraction together with the air flow, fixed to the housing cover, a nozzle for outputting a large fraction with an unloading device located in the lower part of the housing, a working body consisting of an upper disk with the neutral hole in communication with the nozzle for outputting the fine fraction together with the air flow, the lower disk and the blades located between the upper and lower disks on their peripheral part and interacting with the tangential nozzle for supplying the source material, and the drive of the working body, characterized in that the classifier contains blades vertically and evenly mounted on the upper disk of the working body around its central hole and located in the lower part of the nozzle to output the fine fraction together with air nym stream.

The utility model is illustrated by drawings: figure 1 - General view of the classifier, the vertical axial section; figure 2 - view a in figure 1.

The air centrifugal-dynamic classifier contains a housing 1 (for example, cylinder-conical) with a cover 2, a tangential pipe 3 for supplying the starting material located in the upper part of the housing 1, a pipe 4 for outputting a fine fraction together with the air flow, mounted on the cover 2 of the housing 1, a pipe 5 with a discharge device 6, for example, of a flasher type for withdrawing a large fraction from the classifier, located in the lower part of the housing 1, a working body consisting of an upper disk 7 with a central hole 8 in communication with a nozzle 4 for outputting the fine fraction together with the air flow, the lower disk 9 and the blades 10 located between the disks 7 and 9 on their peripheral part and interacting with the tangential nozzle 3 for feeding the source material, the blades 11 vertically and evenly mounted on the upper disk 7 the working body around its Central hole 8 and located in the lower part of the pipe 4 to output the fine fraction together with the air flow, and the drive of the working body (not shown in the drawings). A pipe 4 for outputting a fine fraction together with the air flow through a cyclone or through a filter system is connected to a fan (not shown in the drawings).

A pipe 3 for supplying the source material may be located in the lower part of the housing 1. The working body may contain a hole made in the central part of the lower disk 9. In this case, the pipe 4 for outputting the fine fraction together with the air flow will be located in the lower part of the housing 1. The drive of the working body (not shown in the drawings) can be located in the upper part of the housing 1.

A utility model is used as follows.

By means of a drive, the working body is rotated at the required speed. By means of a fan at the outlet of the nozzle 4 for outputting the fine fraction together with the air flow and in the central part of the working body, a vacuum is created and through the tangential pipe 3 the source material is fed into the annular separation zone - the space between the wall of the housing 1 and the blades 10 of the working body. In the separation zone, the rotating blades 10 impart rotation in a horizontal plane about the vertical axis of the classifier to the air stream containing the source material. In this case, two oppositely directed forces act on the source material: centrifugal force due to the rotation of the air flow around the vertical axis of the classifier, and aerodynamic drag due to the movement of the air flow through the interscapular space formed by the blades 10 to the central part of the working body.

For large particles in the separation zone, the centrifugal force prevails over the force of aerodynamic drag, as a result of which large particles of the blades 10 are thrown onto the wall of the housing 1 and, under the action of gravitational force, move down along it and are removed from the classifier through the nozzle 5 with an unloading device 6 of the “blinker” type.

For small particles in the classification zone, the aerodynamic drag force prevails over the centrifugal force. As a result, they, together with the air flow, move to the central part of the working body and through the hole 8 and pipe 4 are removed from the classifier together with the air flow.

Since the movement of the dusty air flow with the starting material is complex, some large particles, due to collisions with each other, acquire a significantly higher speed than the average speed of the particles of the starting material. Due to their high speed, these particles overcome the classification zone and, through the interscapular space formed by the blades 10, enter the central part of the working body. In the prototype, these large particles are removed from the classifier by air flow together with the fine fraction through the hole 8 and pipe 4. In the claimed solution, thanks to the rotating blades 11 in the lower part of the pipe 4 to output the fine fraction together with the air stream, a swirl of air flow is created. As a result of this, under the influence of the centrifugal force arising due to the spin, large particles of material are discarded to the wall of the nozzle 4. Under the influence of gravitational force, the particles move downward, fall on the upper disk 7 of the rotating working body, and under the action of centrifugal force are discarded to the wall of the housing 1. Under by the action of gravitational force, these particles together with other large particles are moved to the lower part of the housing 1 and are removed from the classifier through a pipe 5 with a discharge device 6 of the "blinker" type.

Thus, the vertical blades 11 allow you to remove large particles of material from the fine fraction of the finished product and thereby provide an increase in the separation efficiency of the material by the classifier.

The boundary of the separation of material is regulated by the number of revolutions of the working body. With an increase in the number of revolutions, the separation boundary decreases, and with a decrease in the number of revolutions, it increases.

Claims (1)

An air centrifugal-dynamic classifier comprising a housing with a lid, a tangential nozzle for supplying the source material located in the upper part of the housing, a nozzle for outputting a fine fraction together with air flow, mounted on the housing cover, a nozzle for outputting a large fraction with an unloading device located in the lower part of the body, the working body, consisting of an upper disk with a Central hole in communication with the pipe for outputting a fine fraction together with the air flow, the lower disk and the blade ok located between the upper and lower disks on their peripheral part and interacting with the tangential branch pipe for supplying the source material, and the drive of the working body, characterized in that the classifier contains blades vertically and evenly mounted on the upper disk of the working body around its central hole and located in the lower part of a branch pipe for a conclusion of a fine fraction together with an air stream.