SU1730134A1 - Aeration and stirring device of apparatuses for cultivating microorganisms - Google Patents

Abstract

The invention relates to the microbiological industry, in particular to devices for aeration and mixing in apparatus for growing microorganisms. The purpose of the invention is to increase productivity and reliability. A device for aeration and mixing to microorganism growing machines contains conical plates 1 and 2 installed to form an annular nozzle 5, a turbine 6 for supplying air located inside the conical plates, a blade-shaped stator 7 mounted with a gap around the annular nozzle, and preventing the ejection of culture fluid flows from the ambient space into the stator. The latter comprises a diffuser 8 located at the exit of the annular nozzle and formed by flapping 9 conical plates made at an acute angle to the horizontal plane, and blades 10 fixed radially on the periphery of the outer surfaces of the conical plates inclined in the direction opposite to the direction of rotation. 4 il. (L

Description

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The invention relates to the microbiological industry, in particular to devices for aeration and mixing in apparatus for growing microorganisms.

A device for mixing and aerating the medium in microorganism growing devices is known, consisting of conical plates installed to form an annular nozzle, between which is placed a turbine for supplying air. A stator is mounted around the annular nozzle with a gap consisting of two annular disks, between which the blades are placed.

The disadvantage of this device is the presence of resistance to the main gas-liquid flow, flowing from the annular nozzle, from the side of the cultural liquid with a reduced gas content ejected through annular gaps.

Closest to the present invention is a device for aeration and mixing with apparatus for growing microorganisms, comprising conical plates installed to form an annular nozzle, a turbine for supplying air located inside conical plates, a stator mounted with a gap around the annular nozzle, and means to prevent the ejection of fluids of the culture fluid from the surrounding space into the stator.

However, the known device is characterized by insufficiently high performance and reliability in operation, due to the design of the means for preventing the ejection of culture fluid streams from the surrounding space into the stator. So. Due to the large difference in the areas of the output section of the annular nozzle and the inlet section of the stator, there is an instantaneous expansion of the gas-liquid flow, which reduces the pumping capacity of the device, and a significant radial displacement of the device in the plane of rotation and its axial displacement leads to unevenness and change in the amount of overlap of the annular gaps between the nozzle and the stator elastic flaps.

The purpose of the invention is to increase productivity and reliability in operation.

This goal is achieved by that in the proposed device for aeration and mixing to microorganism cultivation apparatuses containing conical plates installed with the formation of an annular nozzle, a turbine for

an air supply located inside the conical plates, a stator mounted with a gap around the annular nozzle, and means to prevent ejection

the flow of culture fluid from the surrounding space into the stator, a means to prevent the ejection of the flow of culture fluid contains a diffuser located at the outlet of the annular

0 nozzles and formed by flanging of conical plates, made at an acute angle to the horizontal plane, and vanes, mounted radially on the periphery of the outer surfaces of conical containers, with a slope in the direction opposite to the direction of rotation.

Figure 1 shows the proposed device, a vertical section; FIG. 2 is a view A of FIG. 1; on fig.Z - section bb on

0 figure 2: figure 4 - node I figure 1.

A device for aeration and mixing to microorganism growing machines contains conical plates 1 and 2 having suction ports 3 and 4.

5 The conical plates form an annular nozzle 5. In the central cavity between the plates 1 and 2 there is a turbine 6 for supplying air to the liquid. With a gap around the annular nozzle 5 mounted stator 7

0 with paddles. A diffuser 8 is located at the exit of the annular nozzle 5. Formed by flanging 9 conical plates 1 and 2, made at an acute angle a to the horizontal plane, and on the periphery of the outer surfaces of conical plates 1 and 2 radially tilted in the direction opposite to the direction of rotation, the blades are fixed ten.

The device for aeration and mixing works as follows.

After the device is installed in the microorganism growing apparatus and fixed on the drive shaft, it is rotated and the circulatory movement of the fluid that enters through the suction mouths 3 and 4 is ejected from the nozzle 5. After the high velocity has elapsed, the fluid draws air from internal volume of the turbine 6. Air is mixed with the liquid and dispersed therein. The resulting flow of gas-liquid mixture flows out of the annular nozzle 5, smoothly expands in the diffuser 8 and enters the

5, the stator 7. When not aerated, the liquid adjacent to the outer surfaces of the conical plates 1 and 2, when the device rotates under the action of centrifugal forces, moves along the surface, falls on the vanes 10 and is withdrawn up and down from

annular gaps between the diffuser 8 and the stator 7. Thus, a hydrodynamic seal is created for the non-aerated fluid, preventing it from entering the stator.

When located at the outlet of the annular nozzle 5 of the diffuser 8 formed by the screenings 9 of the conical plates 1 and 2, made at an acute angle a to the horizontal plane, the sectional area of the annular nozzle at the exit of the device increases, which leads to a decrease in the flow rate of the gas-liquid mixture due to the smaller radial component of the velocity vector) and, consequently, to a decrease in the resistance to the main flow from impact losses at the entrance to the stator and a decrease in the ejection forces that tend to draw the liquid from the reduced m gas content from the surrounding space to the stator.

All this allows to improve the performance and reliability of the device.

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Claims (1)

Invention Formula A device for aeration and mixing to microorganism growing machines, comprising conical plates installed to form an annular nozzle, a turbine for supplying air located inside conical plates, a stator mounted with a gap around the annular nozzle, and means to prevent ejection of culture streams. fluid from the surrounding space to the stator, in that, in order to increase productivity and reliability in operation, the means for preventing content ejection um diffuser located downstream of the annular nozzle and formed otbortov- kami conical plates, made at an acute angle to a horizontal plane and vanes radially reinforced at the periphery of the conical outer surfaces of plates inclined in the direction opposite the direction of rotation. 2