CN108384703A - A kind of combined type single frame agitating paddle - Google Patents

Abstract

The invention discloses a kind of combined type single frame agitating paddle, including rectangular outer frame, shaft, trip bolt, fluting inclined blade, semi-circular straight blade, for being stirred and fermentation arts.It is characterized in that：The agitating paddle rectangular outer frame section uses circular configuration, whole cylinder structure；Combination is disposed with axially stream paddle and radial flow paddle in rectangular outer frame, the former is semi-circular straight blade, and the latter is fluting inclined blade, and inclined blade lower section coupling part offers rectangular notch；Straight blade and inclined blade is straggly is arranged in rectangular outer frame both sides, the position of same shape blade is symmetrical relative to agitating paddle centroid；The agitating paddle is applied in combination with interior agitating paddle and enhancing agitating paddle, forms storing tank.The agitating paddle can make zymotic fluid mixing and gas dispersion effect more preferable, meanwhile, the smaller volume of the agitating paddle is occupied highly beneficial to the power consumption for improving space utilization and reduction mixing plant in fermentation tank.

Description

A combined single-frame stirring paddle

technical field

The invention relates to a combined single-frame stirring paddle, which is used in the field of stirring and mixing, particularly in the fields of stirring, mixing and fermentation.

Background technique

Stirring equipment is widely used in the field of fermentation, and it is often used in two-phase or three-phase operating conditions. In the biological fermentation process, often accompanied by heat and mass transfer and biological reactions, it is necessary to feed gas into the fermentation device to fully mix it with the fermentation liquid. The degree of dispersion of the gas in the fermentation liquid has a decisive impact on the final fermentation performance. In high-viscosity fermentation system, the degree of its influence is even greater. The stirring paddle is the main device to realize the mixing and dispersing effect. The mixing and dispersing effect of the current stirring paddle in the field of high-viscosity fermentation is not ideal. At the same time, during the entire fermentation process, the viscosity of the fermentation broth gradually changes from medium-low viscosity to high viscosity, and the range of change is relatively large, which puts forward higher requirements for the adaptability of the stirring paddle within a large range of viscosity change. For example, the high-viscosity special stirring paddle is suitable for a narrow viscosity range, and the mixing and dispersion effect of the high-viscosity special stirring paddle is poor in the medium and low viscosity stage.

Contents of the invention

In view of the above situation, the present invention designs a combined single-frame stirring paddle, combines it with the traditional stirring paddle, and applies it to the fermentation process, so as to solve the problem of insufficient gas-liquid mixing in the fermentation process and the high viscosity fermentation process. The problem of uneven gas dispersion.

The technical solution adopted by the present invention to solve its technical problems is:

A combined single-frame stirring paddle, including a rectangular outer frame, a rotating shaft, a fastening screw, a slotted inclined paddle, and a semicircular straight paddle, characterized in that the rectangular outer frame of the combined single-frame stirring paddle The upper combination is arranged with slotted inclined paddles and semicircular straight paddles, which produce a chaotic mixing effect on the fermentation liquid; the combined single-frame stirring paddle is used in combination with the inner paddle and the enhanced paddle, and all the paddles pass through The fastening screw is fixed on the rotating shaft, the inner stirring paddle is installed in the middle of the outer single-frame stirring paddle, and the reinforced stirring paddle is installed on the upper or lower end of the outer single-frame stirring paddle to stir the fermentation liquid together. The single-frame stirring paddle mainly fully disperses the gas added to the fermentation liquid, and forms an internal circulation system with the internal stirring paddle and the enhanced stirring paddle to further promote the mixing of the fermentation liquid and the dispersion of the gas.

Further, the slotted oblique paddles and semicircular straight paddles on the rectangular outer frame of the stirring paddle are alternately arranged on both sides, and the arrangement positions of the paddles of the same shape are symmetrical to the shape center of the paddle.

Further, the blades on the rectangular outer frame of the stirring paddle are divided into two types: axial flow blades and radial flow blades, the axial flow blades are straight blades, and the radial flow blades are 45° oblique The straight leaves are in the shape of multiple semicircles or sinusoidal (cosine) shapes, which can fully disturb the fermentation liquid when stirring the fermentation liquid and strengthen the mixing; the connecting part under the oblique leaves is provided with a rectangular or triangular notch , Round corner transition, further shearing of the fermentation liquid while reducing resistance to enhance the mixing effect, the oblique leaves are all inclined along the top, and have a guiding effect on the upward dispersion of gas.

Furthermore, the outer frame section of the combined single-frame stirring impeller adopts a circular structure, and the overall structure is cylindrical, which has a better shearing effect compared with the sheet structure.

Further, the internal stirring paddle and the reinforcing stirring paddle used in combination are axial or radial flow stirring paddles, which fully mix the fermentation broth.

The beneficial effects of the technical solution of the present invention are: the combined single-frame stirring paddle disclosed by the present invention has a simple structure, is convenient to process and manufacture, is suitable for mass production, and can be combined with various axial or radial flow with mature production technology. The combination of stirring paddles has strong applicability. The innovative structure of the combined single-frame stirring paddle can realize the mixing of the external flow field and the full dispersion of the gas in the fermentation liquid during the fermentation process, so that the mixing and dispersion effect in the fermentation system is better. At the same time, the combined single-frame stirring paddle has a small volume, which is very beneficial for improving the space utilization in the fermentation tank and reducing the power consumption of the stirring equipment.

Description of drawings:

Fig. 1 is a structural schematic diagram of a combined single-frame stirring paddle of the present invention.

Fig. 2 is a schematic diagram of the combined use of the combined single-frame stirring paddle, the inner paddle and the reinforced paddle of the present invention.

In the figure: 1. Rectangular outer frame; 2. Rotating shaft; 3. Fastening screw; 4. Slotted oblique paddle; 5. Semicircular straight paddle; 6. Combined single-frame stirring paddle; 7. Internal stirring 8. Enhanced stirring paddle.

Detailed ways:

The present invention will be described in detail below in conjunction with the accompanying drawings.

In conjunction with accompanying drawing 1, the specific structural form of a combined single-frame stirring paddle of the present invention is shown in Figure 1: 1 is a rectangular outer frame, 2 is a rotating shaft, 3 is a fastening screw, 4 is a slotted oblique paddle, 5 is a semicircular straight paddle. The combined single-frame stirring paddle is fixedly connected to 2 rotating shafts through 3 fastening screws, and 1 rectangular outer frame has a circular cross-sectional structure. This structure is designed to form a circumvention flow, which has a shearing effect on the fluid, and the circumvention flow can reduce the flow of liquid Resistance: 4 slotted oblique blades and 5 semicircular straight blades are welded on the rectangular outer frame, and a rectangular slot is opened in the welding area of the slotted oblique blades, the purpose of which is to locally shear the flow field , and then form a new chaotic region. The semicircular structure of the semicircular straight blade can form a small-scale disturbance to the external flow field and strengthen its mixing effect. The blades on the entire rectangular outer frame are distributed symmetrically around the rectangular outer frame according to the center from the position, and present a random distribution form, aiming to combine with the inner stirring paddle to create an inclined flow area, so that the fermentation liquid can be mixed more evenly.

Referring to accompanying drawing 2, a combined single-frame stirring impeller of the present invention is used in combination with existing axial flow or radial flow stirring impellers during application. Among them, 6 is a combined single-frame stirring paddle, which is the main embodiment of the combined form; 7 is an internal stirring paddle, which is used to form an internal stirring combination with a single-frame paddle. 2 is only for schematic display; 8 is a reinforced stirring paddle, which is distributed on the upper and lower ends of the single-frame paddle, and the form of the paddle is not required in more detail. All the stirring paddles shown in Fig. 2 can use the existing stirring paddles, and there is no need to carry out innovative design on their structures, which shows that the combined single-frame stirring paddles of the present invention have wide adaptability.

The combined form of the combined single-frame stirring paddle and the rest of the paddles in Fig. 2 is one of the final forms used in the fermentation process. In the early stage of fermentation, the viscosity of the entire fermentation broth is not high, and the flow field is mainly in the form of turbulent flow. After the gas is introduced, the combined single-frame stirring paddle mainly mixes the flow field in the rotating area of the rectangular outer frame and the surrounding area, and mixes the flow field outside the rectangular frame. The gas in the frame rotation area and the surrounding area is fully dispersed; the inner stirring paddle and the upper and lower enhanced stirring paddles play their original stirring and mixing functions. In the middle and late stages of fermentation, the viscosity of the fermentation broth is very high, and the fermentation broth itself has a pseudoplastic fluid property, and its viscosity becomes thinner with shearing. Therefore, the liquid in the entire fermentation tank must maintain a certain shear rate to avoid A state where the viscosity is too high due to the absolute speed being too low. The combined single-frame stirring paddle can maintain a certain flow speed in the outer area of the entire fermentation broth, and cooperate with the inner stirring paddle to form a fluid flow inclined 45° to the horizontal plane, and drive the fermentation broth to turn over in this flow direction , while the fermentation broth is turning over and flowing, the upper and lower sides of the paddle of the enhanced stirring paddle have a liquid discharge area, and this discharge area brings the liquid into the flow field formed by the combined single-frame paddle and the inner paddle, making it With further mixing, the chaotic effect in the entire mixing system becomes more pronounced.

It should be noted that the specific implementation of the present invention is only one of various implementations, and its purpose is to enable those skilled in the art to understand and implement the content of the present invention, and not to limit the protection scope of the present invention. In the specific embodiment of the present invention, about the shape of the frame of the combined single-frame stirring paddle, the number of the semicircle straight paddle semicircle, the number of the inclined paddle slotting and the shape of the groove and the number of paddles distributed on the frame can be determined by The skilled person makes relevant changes, but any modification, equivalent change and improvement made according to the spirit and principle of the present invention shall be included in the scope of protection required by the present invention.

Claims (4)

1. A combined single-frame stirring paddle, comprising a rectangular outer frame, a rotating shaft, fastening screws, slotted oblique paddles, and semicircular straight paddles, is characterized in that: the rectangular shape of the combined single-frame stirring paddle The outer frame is combined with slotted inclined paddles and semicircular straight paddles; the combined single-frame paddle is used in combination with the internal paddle and the reinforced paddle, and all paddles are fixed on the shaft by fastening screws Above, the inner stirring paddle is installed in the middle of the outer single-frame stirring paddle, and the reinforced stirring paddle is installed at the upper or lower end of the outer single-frame stirring paddle. 2. The combined single-frame stirring paddle according to claim 1, characterized in that: the combined single-frame stirring paddle has a rectangular outer frame, and the slotted oblique paddles on the rectangular outer frame and the semicircular straight The paddles are staggeredly arranged on both sides of the rectangular outer frame, and the arrangement position of the paddles of the same shape is symmetrical to the shape center of the stirring paddle. 3. The combined single-frame stirring paddle according to claim 1, characterized in that: the paddles on the rectangular outer frame of the paddle are divided into two types: axial flow paddles and radial flow paddles, and axial flow paddles The flow blades are straight blades, and the radial flow blades are 45° inclined blades. The straight blades are in the shape of multiple semicircles or sine (cosine) shapes, and a rectangular or triangular groove is opened at the connecting part below the oblique blades. Mouth, rounded transition, oblique leaves are inclined along the top. 4. The combined single-frame stirring paddle according to claim 1, characterized in that: the outer frame cross-section of the combined single-frame stirring paddle adopts a circular structure, and the overall structure is cylindrical.