RU129424U1 - MIXING DEVICE - Google Patents

Abstract

A device for mixing, comprising a vertical housing placed inside the heat exchanger jacket, an agitator in the form of blades fixed to the shaft, nozzles for introducing the initial components of the device, a nozzle for unloading the finished mixture from the device body, characterized in that the blades are fixed with the lift along the rotation of the mixer and made in the form of hollow hydrodynamic tubes with suction and discharge holes located along the entire working length of the shaft at an angle to the axis of the shaft, which divides the tubes in a ratio of 1: 3.

Description

The utility model relates to the technique of mixing heterogeneous media, and can be used in the chemical, construction, food, radiochemical industries.

When developing equipment for practical implementation in industry, there are constantly problems of choosing a specific embodiment of a mixing device, its operability and ensuring the proper quality of mixing process media.

In large-volume apparatuses, elimination of inefficient zones is especially important, since in such apparatuses the number of stagnant zones can be large, and the zones themselves are extensive.

Effective mixing of media is a prerequisite for obtaining a high-quality finished product. Therefore, taking into account the features of the process of mixing media, identifying inefficient and stagnant areas in devices with mixers and eliminating these areas is one of the ways to increase the efficiency of technological processes.

Studies of recent decades have shown that to obtain the highest quality mixing of components and the best mixing of process fluids in industrial conditions, anchor mixers are used that are used for intensive mixing of low-viscosity liquids, preparation of suspensions and emulsions, and the lifting of sediments from fine particles from the bottom of devices. However, the low efficiency of mixing viscous liquids, the limited amount of intensive mixing of liquids are the disadvantages of these types of devices.

It is especially important when several types of liquid and solid components are present and interact in the housing of mixing devices, which differ in physical and chemical composition, which must be rationally distributed throughout the volume in order to ensure effective mixing of liquid and heterogeneous media, to obtain a homogeneous mixture, to reduce operational cost and increase device performance.

Therefore, the developers of the device were faced with the task of increasing the efficiency of the process of mixing heterogeneous and homogeneous media, rational distribution of components to ensure high-quality mixing and to obtain a uniform mixture of media.

From this point of view, we will consider solutions known from the prior art that are similar to those claimed and analyze their capabilities for solving the above problem.

A known mixer for viscous and pasty materials (see ed. Certificate of the USSR No. 768445, class B01F 7/00, 1979), comprising a vertical housing with a heat exchange jacket, a drive shaft, a mixer with blades, a pipe for loading into the housing of the starting components ( loading hatch), pipe for unloading (unloading hatch) from the body of the finished mixture device.

Also known is a mixing device (see autosd. USSR No. 829153, class B01F 7/16, 1979), containing a “housing and mixer in the form of upper and lower hollow blades attached to the shaft with suction and discharge holes and placed on the inner surface the vessel has a ring of triangular section, the inner edge of which is located in a plane perpendicular to the axis of the mixer, and the injection holes of the upper blade are located under this edge, and the injection holes of the lower blade are located above the specified edge. "

A disadvantage of the known devices is the formation of stagnant zones and funnels during mixing. The presence on the inner side surface of spiral corrugations in the first device and reflective partitions (distribution ring having a triangular section) does not allow creating the necessary turbulence inside the flow. When mixing such compositions, in which the resistance is very high, the flow quickly loses speed, as a result of which the mass sticks, stagnant zones form.

The closest in technical essence and the achieved result is a device for mixing by autosvid. USSR No. 1681930, class B01F 7/16, 1989), This device is adopted as a prototype.

“The device contains a cylindrical container, an agitator with blades fixed on it, nozzles for supplying liquid and gaseous control media, and a nozzle for discharging the finished product. Each blade is screw-shaped and equipped with a cylindrical nozzle with a section in the form of a cone connected by a smaller base to the nozzle opening closest to the shaft. Neighboring blades have an opposite spin direction. In this case, the nozzle has the shape of a venturi pipe. The tank is equipped with a heat exchange jacket "

A comparative analysis of the characteristics of the known and claimed devices revealed the following: the prototype, like the claimed device, has a vertical body (cylindrical container), a shaft with blades fixed on it (a mixer with blades attached to it), nozzles for inputting the original components of the device (nozzles for supply liquid and gaseous media), a pipe for unloading the finished mixture from the device body (pipe for discharging the finished product). The housing is located inside the heat exchange jacket (heat exchange jacket).

However, mixing in this device is not intensive enough due to the fact that half of the sediments absorbed into the expanded part from the bottom of the heavy sediment tank, being reflected from the device body, fall back into the lower part of the tank without mixing with the upper layers of liquid. The known apparatus cannot provide the efficiency of obtaining a one hundred percent homogeneous mixture.

The above disadvantages are absent in the proposed technical solution as a utility model.

The mixing device, like the prototype, contains a vertical housing placed inside the heat exchange jacket, an agitator in the form of blades fixed on the shaft with suction and discharge holes, nozzles for introducing the initial components of the device, a nozzle for unloading the finished mixture from the device body.

The inventive device is characterized in that the blades are fixed with a lift along the rotation of the mixer, made in the form of hollow tubes located along the entire working length of the shaft at an angle to the axis of the shaft, which divides the tubes in a ratio of 1: 3.

The claimed utility model "Device for mixing" meets the conditions of patentability.

The inventive utility model has novelty, since the totality of its essential features is unknown from the prior art, as shown by the applicant's patent research and the above analysis similar to the claimed technical solutions.

The utility model is industrially applicable, as it can be used in the chemical, construction, food, radiochemical industries.

To confirm the above, we present a description of the specific constructive implementation of the claimed apparatus and its operation.

The utility model is illustrated by drawings. Figure 1 shows a General view of the apparatus in section; figure 2 is a section aa.

The device for mixing contains a vertical housing 1 placed inside the heat exchange jacket 2.

In the housing 1 of the device is a mixer 3 in the form of blades fixed to the shaft. The blades are made in the form of hollow hydrodynamic tubes 4, 5 and 6, fixed with a rise along the rotation of the mixer and located along the entire working length of the shaft at an angle to the axis of the shaft, which divides the tubes in a ratio of 1: 3.

The shaft is connected to the engine 7.

The device is also equipped with nozzles 8 and 9 for introducing the initial components of the device, nozzle 10 for introducing steam into the heat exchange jacket 2, nozzle 11 for removing condensate from the heat exchange jacket 2.

The conical bottom 12 has an outlet pipe 13 for unloading the finished mixture from the housing of the device 1.

The claimed device operates as follows.

The initial components are fed into the housing 1 through nozzles 8, 9. From the engine 7, the mixer 3 is rotated in the form of hollow hydrodynamic tubes 4, 5 and 6 fixed to the shaft. Under the action of centrifugal forces, the liquid is distributed along the peripheral part of the device housing 1, flowing into the central part. Part of the mixed medium under the influence of drag through the suction openings of the tubes 4, 5 and 6 moves to the discharge openings, and the bulk of the medium under the influence of the outer surface of the hollow tubes 4, 5 and 6 receives a rotational movement with the formation of secondary circulation zones. The fluid flow makes a spiral motion along the housing 1 of the device, thus, there is an intense spiral flow washing the walls. The jets of the mixed medium ejected from the injection holes of the tubes 4,5 and 6 are directed towards each other, intersect with the horizontal layers of fluid of rotational movement, which leads to an increase in the multiplicity of fluid circulation from the upper part of the device body 1 to the lower one and vice versa, resulting in heavy precipitation moves from the bottom of the housing 1 of the device and is distributed throughout the volume. In this case, four circulation circuits are formed, which contribute to intensive mixing in this zone and exclude the formation of stagnant zones. Thanks to the presence of a heat exchange shirt, heat transfer is intensified.

Under the influence of the dynamic pressure of the flow, the heat exchange surfaces of the housing 1 of the device are cleaned without using scraper devices. The absence of sticking and the formation of stagnant zones in the housing 1 of the device eliminates its stop for cleaning and washing, and therefore contributes to its smooth operation. The finished product is removed from the housing 1 of the device through the outlet pipe 13.

Using the proposed device will intensify the process of obtaining high-quality mixtures and improve the conditions of their service.

Claims (1)

A device for mixing, containing a vertical housing placed inside the heat exchanger jacket, an agitator in the form of blades fixed to the shaft, nozzles for introducing the initial components of the device, a nozzle for unloading the finished mixture from the device body, characterized in that the blades are fixed with the lift along the rotation of the mixer and made in the form of hollow hydrodynamic tubes with suction and discharge holes located along the entire working length of the shaft at an angle to the axis of the shaft, which divides the tubes in a ratio of 1: 3.

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