RU2290986C2 - Screw mixer - Google Patents

Abstract

FIELD: food, chemical industries, production of building materials, agricultural engineering.

SUBSTANCE: invention relates to equipment for mixing and/or homogenizing of loose, liquid and gaseous components. Proposed screw mixer contains housing and screw fitted inside housing. Screw is made for rotation creating counter-pressure on received components and it consists of shaft and main perforated blade secured on shaft. Screw is provided with additional blade (solid or perforated one) secured on shaft from side of delivery of components to be mixed, or from other side with arrangement opposite to arrangement of main perforated blade. Additional blade serves to compensate for axial counter-pressure created by main blade on components delivered for mixing and for closing all axial forces on screw shaft.

EFFECT: simplified design, intensified mixing process, improved quality of mixture.

1 dwg

Description

The invention relates to equipment for mixing and homogenization of bulk, liquid, gaseous components and can be used in various fields of human activity: food, chemical industry, construction, agricultural engineering.

A mixer is known from the prior art (patent RU No. 20088082, class B 01 F 7/08, published 1994.02.28), comprising a housing with loading and unloading nozzles and a mixing working element located inside the housing, made in the form of an outer concentrically mounted on the drive shaft and internal screw tapes with the opposite direction of winding. In this case, the mixing working body is equipped with grooves installed diametrically opposite to the shaft, convex in the direction of the housing and connected at one end to the shaft, and the other with a non-working surface of the external auger tape, on which holes communicating with them are made in the place of attachment of the grooves.

The disadvantages of this mixer include the complexity of the design.

A known mixer (application RU No. 2002110794/12, class B 01 F 7/26, published 2003.10.27) containing a working body in the form of a disk. In this case, the rotor is made of two parts, the upper of which is equipped with a distribution ring with axial holes, in the lower part there are fixed radial partitions with holes of circular cross section. On the periphery of the lower disk, confusers are installed, with a large section facing the direction of rotation of this disk, and the lower disk has a shoulder, the height of which is equal to the larger diameter of the confuser.

The disadvantages of this device include a relatively low performance

Closest to the claimed solution is a feeder-mixer (patent RU No. 2147289, class 65 G 65/30, published 2000.04.10), which is selected as a prototype. This feeder-mixer contains a housing with loading and unloading nozzles, auger and spiral. In this case, the screw and the spiral with the opposite winding covering it over the entire length are placed coaxially with the possibility of counter rotation, with the ends of the spiral rigidly attached to the bushings that fit freely on the shaft of the screw. The inner diameter of the spiral D _St = D _nsh + (5 ... 10) mm. The outer diameter of the spiral D _sn ≥2D _nsh , where D _nsh is the outer diameter of the screw.

The disadvantages of this feeder-mixer include the relatively low quality of mixing the components.

The technical result of the inventive screw mixer is to simplify the design, intensify the mixing process and improve the quality of the resulting mixture.

The technical result is achieved due to the fact that the screw mixer comprises a housing and a screw located coaxially inside the housing. In this case, the screw consists of a shaft and a main perforated feather fixed thereon and an additional feather made perforated or non-perforated, and the main and additional feathers are wound in opposite directions, and the screw rotates in the direction that creates the back pressure with the main feather on incoming mixed Components.

The drawing shows the design of a screw mixer, where

1 - housing;

2 - auger;

3 - shaft;

4 - the main perforated feather;

5 - an additional feather.

The screw mixer contains a housing 1. Inside the housing 1 is a screw 2. Moreover, the screw 2 is configured to provide rotation that creates counter-pressure on the incoming components. It consists of a shaft 3 and a main perforated feather 4 fixed on it. In this case, the screw 2 can have a perforated or continuous additional feather 5 fixed on the shaft 3 from the supply side of the mixed components or from the reverse side and having a winding that is opposite to the winding of the main perforated feather 4 .

The screw mixer works as follows.

The components to be mixed are fed into the housing 1 of the screw mixer by an external blower (for example, a gyroter pump, compressor, metering pump, etc.). Using a drive (not shown), the screw 2 is rotated, installed inside the housing 1.

When mixing liquid and gaseous components, for example reagents in the chemical industry, a screw with a basic perforated pen is used.

In this case, the mixed components are fed by an external supercharger into the housing 1, moved along the shaft 3 towards the main perforated feather 4. When they get onto the main perforated feather 4, the mixed components experience the counter pressure created by the main feather 4, causing them to repeatedly extrude through the holes of the perforated feather 4 and their continuous mixing with the formation of numerous cavitation zones.

When mixing liquid and bulk components, for example, in construction, in the preparation of foam concrete, a screw is used with a main perforated feather and an additional (perforated or solid) feather.

Mixed components, as in the first case, are fed by an external supercharger into the housing 1, moved along the shaft 3 towards the main perforated feather 4. Getting on the main perforated feather 4, the mixed components experience the counter pressure created by the main feather 4, prompting them to repeatedly extrude through the holes of the perforated pen 4 and their continuous mixing with the formation of numerous cavitation zones.

In this case, an additional (perforated or solid) feather 5 of the screw 2 creates associated pressure on the components to be mixed, compensates for the back pressure of the main perforated feather 4, unloads the blower and closes the resulting axial forces on the shaft 3 of the screw 2.

Thus, the implementation of a screw with a perforated main pen allows you to simplify the design of the screw mixer, to intensify the mixing process and improve the quality of the resulting mixture, so that it can be used both in the food and chemical industries, as well as in construction and agriculture.

Claims (1)

A screw mixer comprising a housing and a screw located coaxially inside the housing, characterized in that the screw consists of a shaft and a main perforated feather fixed thereon and an additional feather made perforated or non-perforated, wherein the main and additional feathers are wound in opposite directions, and the screw rotates in the direction that provides the creation of counter-pressure with the main pen on the incoming mixed components.