RU2195361C1 - Mixer - Google Patents

Abstract

FIELD: mixers for mixing solutions with gases, particularly, with air. SUBSTANCE: mixer includes mixing vessel, drive shaft and mixing working member with hollow blades. Mixing working member is made in the form of mixer shaft installed without possibility of cranking, but with possible removal from drive shaft. Secured to mixer shaft at certain distance from one another and located in rows to form comb are blades. Each blade is of bracket-shaped cross-section with external surface splitting the solution and with internal surface ensuring air introduction into solution. EFFECT: intensified mixing process, provided mixing of materials with different physico-mechanical properties improved convenience in servicing, prolonged service life. 4 dwg

Description

 The present invention relates to devices for mixing solutions with gases, in particular with air, and can be used in the production of building and polymer materials, in chemical technology and other sectors of the economy.

 Known turbulent aerial mixer, which contains a drum with loading and unloading holes, a pipe located in the Central part of the drum. The pipe covers the shaft. At the upper end of the pipe, a cylinder is mounted for rotation with propeller-type blades placed at the bottom of the drum for mixing and pricing, respectively (see patent RU 2070874, class C 04 V 38/08, 28 C 5/38, publ. 12/27/96 g.). The disadvantage of this turbulent mixer is the inability to introduce air into the solution physically.

The closest in technical essence to the present invention is a device for preparing a porous building mixture, including a mixing tank, drive shaft and hollow blades with nozzles. In this case, the drive shaft is equipped with at least two brackets, on each of which a blade is installed at an angle of 45-90 ^o to the horizontal plane, the inner cavity of which is connected to the atmosphere by means of an air intake located in the upper part of the blade from the side opposite to the direction of rotation drive shaft (see patent RU 2081099, class C 04 B 40/00, B 28 C 5/16, publ. 06/10/97).

 In this device, the presence of an air supply channel in the form of a pipe with nozzle exits does not ensure the long-term operation of the mixer due to clogging of the nozzles with the solution, it is difficult to maintain when cleaning the channels, and also does not provide sufficiently high-quality mixing of the solution with air.

 The technical result of the invention is to intensify the mixing process, to ensure high-quality mixing of materials with various physical and mechanical properties, to increase the service life and ease of maintenance of the mixer.

 To solve the technical problems, the mixer includes a mixing tank, a drive shaft and a mixing working body with hollow blades. According to the invention, the mixing working element is made in the form of a mixer shaft mounted without the possibility of rotation, but with the possibility of removal on the drive shaft. At a certain distance from each other, blades arranged in rows in the form of a comb are attached to the mixer shaft. Each blade is a cross section in cross section with an outer surface dissecting the solution, and an inner surface that provides air inlet into the solution.

 With this configuration of the mixing working body, the front edges of the blades cut the solution in the direction of rotation. Narrowing channels are formed between the lateral outer surfaces of the blades, creating additional pressure on the solution flow, which ends with a sharp decline and expansion of the flow in the rear open part of the blades when passing into the internal cavity where air is sucked in, vortex flows arise, due to which intensive foaming and mixing are achieved solution. The intensification of the mixing process is also facilitated by the fact that when the shaft rotates in the center of the tank due to the movement of centrifugal forces, an air column forms, which is the source of gas supply to the blades, and the entire mixer system forms a natural air duct for supplying air to the solution through the internal channels of the blades, which ensures also mixing materials with various physical and mechanical properties.

 The working body of the mixer allows you to quickly and efficiently foam and evenly distribute soluble and insoluble particles and fractions of various weight and shape in the solution.

 The installation of the working body as a whole on the drive shaft with the possibility of removal provides easy and quick access to the internal cavities of the blades, allows you to clean them and, ultimately, increases the life of the entire device.

In FIG. 1 shows a general view of the mixer;
in FIG. 2 - the same, top view;
in FIG. 3 - the same, bottom view;
in FIG. 4 - the same, in a perspective view.

 The mixer contains a mixing tank 1 and a drive shaft 2 having a cross section of a pentagon or hexagon for connection without the possibility of rotation with the corresponding internal section of the shaft 3 of the mixer. Blades 4 are attached to the mixer shaft 3 in rows in the form of a comb at a certain distance from each other. The number of radially arranged rows can vary from two to six or more, depending on the size of the mixer. The distance between the side surfaces of the blades 4 may be different, which is chosen in practice depending on the viscosity of the solution and the purpose of the mixer.

 The location of the drive shaft can also be vertical, horizontal or inclined.

 Each blade 4, attached with a wider end to the shaft 3 of the mixer, is in cross section a staple profile with an outer surface 5 dissecting the solution and an inner surface 6 that allows air to enter the solution (see Fig. 4).

 The lower blades in a row (with a vertical arrangement of the shaft) are made by semi-arcs to intensify volumetric mixing and unloading of the solution (see figure 3).

 The mixer operates as follows. When the drive shaft 2 is rotated together with the shaft 3, the blades 4 dissect the solution with their front face and outer surface 5, and a vacuum is created in the back of the blades. Under the action of centrifugal forces, the solution flows from the blades in the radial direction and creates excess pressure on the walls of the mixer, rising in rotation along the walls up into the zone of reduced pressure and returning along the created air column to the center of the mixing device. The comb design of the working body of the mixer in combination with this configuration of the blades ensures the passage of the solution between the blades in the tapering channels and creates additional pressure on the solution and turbulent mixing when the flow is disrupted from the back of the blade. The cavity 6 inside the blade 4 provides air input due to the vacuum created during the flow around the blade with a solution.

 With a horizontal or inclined axis of rotation of the shaft 2, as well as with the translational or complex movement of the blades 4, the working process provides rarefaction in the rear concave parts of the blades for intake and mixing of air (gas) with the solution, for example, the blades enter the gas medium into the solution with a high frequency of cycles .

 The choice of the layout of the mixer and the blades depends on the application, the process, the composition of the components and the requirements for the final product.

Sources of information
1. Patent RU 2070874, cl. B 28 C 5/38, publ. 12/27/96

 2. Patent RU 2081099, cl. B 28 C 5/16, publ. 06/10/97

Claims (1)

 A mixer comprising a mixing tank, a drive shaft and a mixing working body with hollow blades, characterized in that the mixing working body is made in the form of a removable mixer shaft mounted on the drive shaft, on which the blades are fixed at a certain distance from each other, arranged in rows with the form combs, with each of the blades made in the form of a staple-like profile with an outer surface dissecting the solution and an inner surface providing air inlet into the solution.

Images