The mixing blades used in fermentation tanks include:

Commonly used laboratory fermentation tanksInclined blade propeller type

This type of agitator can be made with an inclination angle of 30 °, 45 °, or 60 °, with axial and radial flow diversion. The flow pattern is more complex than that of a straight blade type, and the discharge performance is higher than that of a straight blade type. The overall effect is better, so the frequency of use is higher than that of a straight blade type.
Composite folding blade propeller type

This is an axial flow impeller that adds an auxiliary blade to the main blade. The auxiliary blade eliminates the flow peeling phenomenon that occurs behind the main blade, reducing the stirring power. At the same time, it can generate cross vertical flow at the blade end, improving the stirring effect. It is suitable for liquid phase reaction processes such as medium and low viscosity mixing, solid-liquid suspension, and heat transfer.
Double bladed propeller type

A multi-stage countercurrent mixer can promote the formation of a larger axial circulation of liquid during operation, reducing mixing time by 30% compared to traditional blade mixers. Especially suitable for liquid-phase reaction processes such as mixing, solid-liquid suspension, dissolution, and heat transfer under transitional flow patterns.
Elliptical blade type

This type of agitator is a variant of the straight bladed propeller type, with the rotating surface of the propeller base close to the elliptical surface of the container, serving as a scraper and mostly operating at low speeds. It can be operated in transitional or laminar flow zones.

Six straight blades open turbine propeller

The flow pattern of this type of agitator is radial flow, which can form two upper and lower circulation flows from the blade boundary when there is a baffle. It has high shear force and large circulation capacity, among which the straight blade opening turbine type has the highest shear force, the curved blade opening turbine type has the lowest shear force, and the inclined blade opening turbine type has the center. So opening vortices with straight blades is more suitable for dispersing the operation process. Curved blades have good discharge performance and are less prone to wear, making them more suitable for solid-liquid suspension. It is also suitable for solid dissolution.

Four inclined blades are commonly used to open the turbine in glass fermentation tanks

The technical performance of this type of agitator corresponds to that of a six blade turbine type. Under the same operating conditions, its power consumption and stirring capacity are inferior to those of a six blade agitator. Under conditions of high relative accuracy and high operating speed, it is superior to six blade agitator and lighter in weight.

Multi blade opening turbine propeller

Axial flow agitator has good convective circulation ability and certain turbulent diffusion ability, which is suitable for applications such as mixing and dispersion, particle crystallization, reaction, dissolution, solid-liquid suspension, heat transfer, etc. Usually used for low-speed dispersion and mixing of materials.

Six rear curved blades open turbine propeller

The flow pattern of this type of agitator is radial flow, and when there is a baffle, it can form two upper and lower circulating flows from the blade boundary. The shear force and circulation capacity are slightly worse than those of straight blade type. The curved blade opening turbine has a smaller shear force and the blade is less prone to wear, making it suitable for solid-liquid suspension. It is also suitable for solid dissolution.

Straight bladed disc turbine propeller

Compared with the turbine agitator, this type of agitator has the same basic flow pattern, high shear capacity, and larger circulation capacity. The difference is that it has an additional disk, which can store some gas underneath, making the gas dispersion more stable. Therefore, it is more suitable for gas dispersion and absorption process.

Inclined blade disc turbine propellerCommonly used stainless steel fermentation tanks

Compared with the straight blade disc turbine agitator, this type of agitator also has high shear capacity and larger circulation capacity. The difference is that the inclined blades have a tilt angle, which can divide the flow axially, have good discharge performance, and low power consumption.

Rear curved blade disc turbine propeller

Compared with the turbine agitator, this type of agitator has the same basic flow pattern, high shear capacity, and larger circulation capacity. The difference is that it has an additional disk, which can store some gas underneath, making the gas dispersion more stable. Therefore, it is suitable for use in gas dispersion and absorption processes; Curved blades have a rear angle, good discharge performance, and low power consumption.

Half circular tube disk turbine propeller

Runoff agitators have concave circular blades with a radial displacement and dispersion capacity of *. At the same power, their mass transfer coefficient is more than 20% higher than that of flat blade disc turbines, their gas holding capacity is increased by more than 30%, and their power consumption ratio is very low. Therefore, they are particularly suitable for dissolved oxygen operation reactions similar to fermentation processes, as well as other gas dispersion, absorption mixing, mass and heat transfer operations.

Parabolic disc turbine

Runoff agitators have parabolic blades with a radial displacement and dispersion capacity of *. At the same power, their mass transfer coefficient is more than 30% higher than that of flat blade disc turbines, and their gas holding capacity is increased by more than 40%. Moreover, their power consumption ratio is very low, making them particularly suitable for dissolved oxygen operations similar to fermentation processes, as well as gas dispersion, absorption, mass and heat transfer operations under other requirements.
Turbine propeller

This type of agitator is developed and researched based on similar products. Compared with the curved blade disc turbine agitator, it has the same basic flow pattern, high shear capacity, and larger circulation capacity. The difference is that it is larger in size, with two more closed discs underneath. It can store a large amount of gas and make the gas and liquid more stable to disperse downwards. At the same time, it does not require a higher speed, so it is more suitable for gas dispersion and absorption process. This paddle can be made into a detachable paddle for easy installation and maintenance.
Push forward type

The three blade propulsion type is a typical axial flow stirrer with high liquid discharge and low shear performance. By using baffles or guide vanes, the axial circulation is stronger and the discharge performance is significantly improved. This is because it has strong circulation ability and low power consumption. Its advantages can be fully reflected in large capacity homogeneous and mixing processes, and it is widely used in low viscosity liquid heat transfer, reaction, suspension, dissolution and other processes with low solid-liquid ratio.

anchor paddle

This type of mixer is a slow speed mixer, suitable for mixing, heat transfer, or reaction processes of medium to high viscosity liquids. The rotating surface at the bottom of the propeller is close to the elliptical surface of the container and also serves as a scraper. It usually operates at low speeds and is often operated in laminar flow. Generate horizontal circumferential flow, such as folding blades or angle steel blades, which can increase eddy currents near the blade.

Anchor frame propeller

This type of mixer is a slow speed mixer, suitable for mixing, heat transfer, or reaction processes of medium to high viscosity liquids. Often operated in laminar flow state. Generate horizontal circumferential flow, such as folding blades or angle steel blades, which can increase eddy currents near the blade. Vertical blades and crossbeams can be added to the propeller as needed to increase the mixing range.

Screw belt propeller

This type of agitator is a slow speed agitator, commonly operated in laminar flow zone, where the liquid rises or falls along the helical surface to form an axial up and down circulation, suitable for mixing and heat transfer of medium and high viscosity liquids. The outer contour of the spiral belt of the spiral belt mixer is close to the inner wall of the mixing tank, with a large mixing diameter, which enhances the up and down circulation of the liquid near the tank wall. The heat transfer process of high viscosity liquids is very suitable. The combination of screw and strip, with the characteristics of both screw and strip, enhances the circulation of the inner and outer periphery of the liquid, especially effective for non Newtonian plastic and viscoelastic liquids. Can be designed according to the shape of the pot bottom and requirements.

Bourmakin style

A six blade turbine type variable agitator. Radial flow pattern, widened blade front end and rear bending angle, not only improves discharge performance but also reduces shear strength, with less power consumption and better discharge performance than straight or curved blade opening turbines. When there is a baffle, it can form an up and down circulation flow, which is more suitable for processes such as mixing, dispersion, solid-liquid suspension, and dissolution.

Three leaf sweep style

As a radial flow stirrer, combined with a finger shaped baffle, it can obtain a large flow of upper and lower circulating flow, and has good shear effect, suitable for applications such as heat and mass transfer, solid dissolution, solid-liquid suspension, polymerization, etc.