CN214244395U

CN214244395U - Composite stirrer for promoting gas-liquid dispersion of fermentation tank

Info

Publication number: CN214244395U
Application number: CN202022555730.1U
Authority: CN
Inventors: 张怀忠
Original assignee: Chongqing Lufeng Tianrun Olive Development Co ltd
Current assignee: Chongqing Lufeng Tianrun Olive Development Co ltd
Priority date: 2020-11-08
Filing date: 2020-11-08
Publication date: 2021-09-21
Anticipated expiration: 2030-11-08

Abstract

The utility model discloses a compound agitator for fermentation cylinder promotes gas-liquid dispersion, including the churn, set up the pivot of being connected in the churn and with actuating mechanism and follow the last axial compressor oar and the lower radial flow oar that the pivot set up in proper order, the last axial compressor oar is the axial compressor stirring leaf more than at least one along pivot circumference equipartition and follows the annular thin slice that axial compressor stirring leaf circumference set up, the axial compressor stirring leaf comprises more than one short blade and the long blade that sets up relatively along the pivot, the tip fixed connection of annular thin slice and long blade, long blade and short blade's diameter ratio 7: and 5, the axial flow stirring blades are vertically arranged on the rotating shaft, the lower radial flow paddle is of a parabolic disc turbine structure consisting of a disc blade handle and radial flow stirring blades uniformly distributed along the circumferential direction of the disc blade handle, the speed gradient or the shear rate is enhanced, high turbulence is formed to reduce the mass transfer resistance between a gas phase and a liquid phase, the gas content and the oxygen mass transfer coefficient are improved, and the uniformity of the whole mixture is kept.

Description

Composite stirrer for promoting gas-liquid dispersion of fermentation tank

Technical Field

The utility model relates to a material mixing field, concretely relates to a compound agitator that is used for fermentation cylinder to promote gas-liquid dispersion for health food processing.

Background

Stirred reactors are widely used in the food field. Especially in the biological fermentation process, aeration and agitation are often required to achieve mixing and mass transfer to meet the requirements of microbial growth on nutrient substrates and oxygen. The stirring paddle is a key device in the stirring type reactor and is the most important part for determining the power consumption and the mixing and mass transfer performance. If the reactor volume and height and diameter are large, multiple layers of paddles are often required to be assembled as required. When the volume and the height-diameter ratio of the reactor are smaller, the single-layer paddle can meet the requirements. Gas-liquid dispersion is an essential operation in an oxidation reaction or a hydrogenation reaction such as aerobic fermentation, and in most cases, it is also required to be carried out by stirring. And the agitators are largely classified into radial flow agitators and axial flow agitators. If the fermentation tank is large in volume and high in material viscosity, the strain belongs to complete aerobic bacteria, the mass transfer resistance of gas phase and liquid phase is large, and the mixing is not uniform. This is not a requirement if only axial flow agitators are used.

SUMMERY OF THE UTILITY MODEL

In view of this, the utility model aims at overcoming the defect among the prior art, provide a compound agitator for fermentation cylinder promotes gas-liquid dispersion, combines together through axial flow stirring and axial flow stirring, strengthens speed gradient or shear rate, forms the high torrent in order to reduce the mass transfer resistance between gaseous phase and the liquid phase, improves gas content and oxygen mass transfer coefficient to keep the homogeneity of whole mixture.

The utility model discloses a compound agitator for fermentation cylinder promotes gas-liquid dispersion, including the churn, set up the pivot of being connected in the churn and with actuating mechanism and the upper axial flow oar and the lower radial flow oar that set gradually along the pivot, the upper axial flow oar is the axial compressor stirring leaf more than at least one along pivot circumference equipartition and the annular thin slice that sets up along axial compressor stirring leaf circumference, axial compressor stirring leaf comprises more than one short blade and the long blade that sets up relatively along the pivot, the tip fixed connection of annular thin slice and long blade, long blade and short blade's diameter ratio 7: 5, the axial flow stirring blade is vertically arranged on the rotating shaft, the lower radial flow paddle is of a parabolic disc turbine structure consisting of a disc blade handle and radial flow stirring blades uniformly distributed along the circumferential direction of the disc blade handle, the distance between the upper axial flow paddle and the lower radial flow paddle is not less than the diameter of the minimum stirring blade, the diameter of the radial flow stirring blade is 0.3-0.4 times of the diameter of the fermentation tank, and the diameter of the axial flow stirring blade is 0.4-0.65 times of the diameter of the fermentation tank;

further, longitudinal ribs are uniformly distributed on the inner wall of the stirring cylinder, a vibration reduction interlayer is arranged in the side wall of the stirring cylinder, and brushes are radially and oppositely arranged on a rotating shaft close to the bottom of the stirring cylinder;

further, the longitudinal ribs smoothly transition to the inner wall of the mixing drum;

further, the vibration reduction interlayer is a rubber layer with a honeycomb structure;

further, the circumferential direction of the annular thin slice is circular;

further, the axial flow stirring blades are of a straight plate-shaped structure;

further, the ratio of the width of the annular slice to the width of the axial flow stirring blade is 3: 2;

further, the thickness of the annular thin slice is the same as that of the axial flow stirring blade, and the width of the annular thin slice is slightly larger than that of the axial flow stirring blade.

The utility model has the advantages that: the utility model discloses a compound agitator for fermentation cylinder promotes gas-liquid dispersion combines together through axial flow stirring and axial flow stirring, strengthens speed gradient or shear rate, forms the mass transfer resistance of high torrent between with reduction gaseous phase and the liquid phase, improves gas content and oxygen mass transfer coefficient to keep the even of whole mixture.

Drawings

The invention will be further described with reference to the following figures and examples:

fig. 1 is a schematic view of the vertical structure of the present invention.

Detailed Description

Fig. 1 is a schematic view of the vertical structure of the present invention. As shown in the figure: the utility model discloses a compound agitator for fermentation cylinder promotes gas-liquid dispersion, including churn 1, set up in churn 1 and the pivot 2 of being connected with actuating mechanism and the last axial compressor oar 3 and the lower radial flow oar 8 that set up along pivot 2 in proper order, last axial compressor oar 3 is the annular thin slice 4 that sets up for the at least more than one axial compressor stirring leaf 3 along pivot circumference equipartition and along axial compressor stirring leaf 3 circumference, axial compressor stirring leaf 3 comprises more than one short blade 31 and the long blade 32 along the relative setting of pivot 2, the tip fixed connection of annular thin slice 4 and long blade 32, long blade 32 and short blade 31's diameter ratio 7: 5, the axial flow stirring blades are vertically arranged on the rotating shaft, the lower radial flow paddle 8 is a parabolic disc turbine structure consisting of a disc blade handle 82 and radial flow stirring blades 81 uniformly distributed along the circumferential direction of the disc blade handle 82, the distance between the upper axial flow paddle 3 and the lower radial flow paddle 8 is not less than the diameter of the minimum stirring blade, the diameter of the radial flow stirring blade 81 is 0.3-0.4 times of the diameter of the fermentation tank, and the diameter of the axial flow stirring blade 3 is 0.4-0.65 times of the diameter of the fermentation tank; adopt the mode of 4 parts of annular thin slice connection stirring leaves, and the diameter (length) of the long blade of being connected with annular thin slice 4 is greater than the diameter of the short blade of not connecting annular thin slice 4, long blade 32 sets up in same circumferencial direction with short blade 31, can produce the axial efflux through axial compressor stirring leaf 3, can increase stirring leaf top and below stirring scope simultaneously, the phenomenon that stirring leaf below stirring scope that avoids annular thin slice 4 to connect all stirring leaves simultaneously and lead to increases and the stirring scope in top reduces produces, avoid the fluid below the churn 1 to disturb the fluid circulation in top simultaneously, improve the whole circulation effect in the churn 1. By combining axial flow agitation with radial flow agitation, the velocity gradient or shear rate is enhanced, high turbulence is formed to reduce mass transfer resistance between the gas and liquid phases, gas content and oxygen mass transfer coefficient are improved, and the uniformity of the entire mixture is maintained. The air distributor is located below the bottom most downflow paddles 8. The runoff stirring vane 81 of the runoff paddle 8 consists of a concave surface which extends in the radial direction and is similar to a fan ring shape, the projections of the upper part and the lower part of the vane on the horizontal plane are fan rings with different radians, the radian of the fan ring obtained by projection of the upper part is larger than that of the lower part, and the shape of the vane similar to the fan ring is the same as the rotating direction, so that each part of the vane is just opposite to incoming flow, the utilization efficiency of the vane is increased, and the stirring paddle has lower energy consumption and better gas dispersion capability.

In the embodiment, a vibration reduction interlayer 6 is arranged in the side wall of the mixing drum 1, and brushes are arranged on the rotating shaft 2 close to the bottom of the mixing drum 1 in a radial direction; the bottom of the mixing drum 1 is provided with a brush which is driven by the rotating shaft 2 to rotate, the brush can improve the deposition phenomenon of the bottom material and can cooperate with the runoff paddle 8 to promote the upward circulation of the bottom deposited material.

In the embodiment, the longitudinal rib 5 smoothly transits to the inner wall of the mixing drum 1; avoid the material to pile up between the contained angle of vertical rib 5 and churn 1 lateral wall, cause the material whereabouts deposit in the bottom, smooth transition face can impel the gas-liquid dispersion.

In this embodiment, the damping interlayer 6 is a rubber layer with a honeycomb structure; because the turbulence phenomenon is enhanced, the impact force of the feed liquid on the mixing drum is strong, and therefore a damping interlayer is required to be arranged to protect equipment.

In the embodiment, the annular sheets 4 are connected in an annular shape along the circumferential direction of the free ends of the axial flow stirring blades 32; preferably, the annular sheet 4 is disposed at the end of the axial flow stirring blade 32, the connection between the annular sheet 4 and the end of the axial flow stirring blade 32 is perpendicular to each other, that is, the annular sheet 4 is perpendicularly connected to the end of the axial flow stirring blade 32, and the annular sheet 4 is of a thin sheet structure. Can produce very strong axial efflux, the axial velocity of reinforcing agitating unit during operation to this increases the scope of stirring, thereby improves stirring efficiency.

In the embodiment, the annular thin sheet 4 is circular in circumferential direction; the circular structure is preferred, and annular sheet 4 is smooth sheet structure, and the effect that produces the axial efflux is better, can all drive the material of churn 1 bottom to the motion, then fall back to stirring leaf 3 to this circulation, reinforcing material mixing effect.

In this embodiment, the axial flow stirring blades are of a straight plate-shaped structure; the axial flow stirring blade is of a flat blade structure and is fixed on the shaft sleeve of the rotating shaft.

In the embodiment, the thickness of the annular sheet 4 is the same as that of the axial flow stirring blade 3, and the width of the annular sheet 4 is slightly larger than that of the axial flow stirring blade 3; the width of the axial flow stirring blade 3 refers to the width of the axial flow stirring blade 3 relative to the length direction, in the stirring process, axial jet flow with high flow speed is easily formed below the axial flow stirring blade 3, and after the fluid is extruded at the end part of the stirring blade 3 and collides with the annular thin sheet 4, the fluid collides with the inner wall and the bottom of the stirring container and then flows upwards along the wall, so that a fluid circulation is formed. Preferably, the ratio of the width of the annular thin sheet 4 to the width of the axial stirring blade 3 is 3: 2.

finally, although the present invention has been described in detail with reference to the preferred embodiments, it should be understood by those skilled in the art that the present invention can be modified or replaced by other means without departing from the spirit and scope of the present invention, which should be construed as limited only by the appended claims.

Claims

1. The utility model provides a compound agitator that is used for fermentation cylinder to promote gas-liquid dispersion which characterized in that: including the churn, set up in the churn and the pivot of being connected with actuating mechanism and the upper axial-flow oar and the lower runoff oar that set gradually along the pivot, the annular thin slice that the at least more than one axial-flow stirring leaf and the axial-flow stirring leaf circumference of edge along pivot circumference equipartition set up of upper axial-flow oar, the axial-flow stirring leaf comprises more than one short blade and the relative long blade that sets up along the pivot, the tip fixed connection of annular thin slice and long blade, long blade and short blade's diameter ratio 7: 5, the axial-flow stirring blade is vertically arranged on the rotating shaft, the lower radial-flow paddle is of a parabolic disc turbine structure consisting of a disc blade handle and radial-flow stirring blades uniformly distributed along the circumferential direction of the disc blade handle, the distance between the upper axial-flow paddle and the lower radial-flow paddle is not less than the diameter of the minimum stirring blade, the diameter of the radial-flow stirring blade is 0.3-0.4 times of that of the fermentation tank, and the diameter of the axial-flow stirring blade is 0.4-0.65 times of that of the fermentation tank.

2. The compound stirrer for a fermenter to promote gas-liquid dispersion according to claim 1, wherein: longitudinal ribs are uniformly distributed on the inner wall of the mixing drum, a vibration reduction interlayer is arranged in the side wall of the mixing drum, and brushes are radially and oppositely arranged on a rotating shaft close to the bottom of the mixing drum.

3. The composite stirrer for a fermenter to promote gas-liquid dispersion according to claim 2, wherein: the longitudinal ribs are smoothly transited to the inner wall of the mixing drum.

4. The composite stirrer for a fermenter to promote gas-liquid dispersion according to claim 3, wherein: the vibration reduction interlayer is a rubber layer with a honeycomb structure.

5. The composite stirrer for a fermenter to promote gas-liquid dispersion according to claim 4, wherein: the annular thin slice is circular in the circumferential direction.

6. The composite stirrer for a fermenter to promote gas-liquid dispersion according to claim 5, wherein: the axial flow stirring blade is of a straight plate-shaped structure.

7. The composite stirrer for a fermenter to promote gas-liquid dispersion according to claim 6, wherein: the ratio of the width of the annular slice to the width of the axial flow stirring blade is 3: 2.

8. the composite stirrer for a fermenter to promote gas-liquid dispersion according to claim 7, wherein: the thickness of the annular thin slice is the same as that of the axial flow stirring blade, and the width of the annular thin slice is slightly larger than that of the axial flow stirring blade.