Is the homogenizing emulsifier pursuing high speed?

- Oct 27, 2020-

The vacuum homogenizing emulsifier plays a very important role in the mixing system of various industries. This feature is very obvious in the aspects of solid-liquid integration, water-oil emulsification, homogeneous dispersion, and grinding and shearing.

The vacuum homogenizing emulsifier has two functions, one is emulsification, and the other is dispersion. What is dispersion? Due to the shearing function of the vacuum homogenizing emulsifier of Guangzhou Jutal Machinery Equipment, the crushing and collision of the powder in the water and liquid is finally reduced to the desired particle size, so that the solids are completely mixed Into the water liquid, and thus become a relatively stable suspension, this workflow is called "dispersion". Like the emulsifier, the stability of the suspension is greatly improved after adding the dispersant. If some solid matter can be completely dissolved by the liquid after a certain period of time is mixed with the liquid, then the fine particles formed by the shear collision will be quickly dissolved by the liquid.

Everyone is accustomed to using high-pressure homogenizers to obtain fine particles. Refinement means the same thing as homogenization. The emulsifier acts on the process of material refinement and full blending, which is also called "homogenization". Therefore, we can also call the emulsifier a homogenizer. In order to distinguish categories, it is usually called high-shear or high-speed homogenizer. Therefore, the emulsifier can be called high-shear dispersing emulsifier, high-shear emulsifier, high-shear homogeneous dispersing emulsifier, high-shear homogenizer, high-shear homogeneous emulsifier, etc.

The shearing efficiency of the emulsifier directly affects the final fineness. After analysis by Guangzhou Jutal Machinery's professional engineers, it is related to the sharpness of the blade, the hardness, the gap between the stator and the stator, the relative movement speed of the cutting edges and the allowable particle size, etc. . Generally speaking, the blade sharpness, hardness, rotor-stator gap and the allowable particle size are generally shaped or not changed, so the relative speed of the blade is the biggest influencing factor. The manifestation of this situation is the circumferential linear velocity of the rotor. If this linear velocity is high, the cutting or collision density of the radially flowing fluid is high, so the thinning effect is strong, and vice versa. However, the linear velocity is not as large as possible. When it reaches a high value, there is a tendency to block the flow, so the flow rate becomes smaller, and the heat is high. Some materials will conversely accumulate, causing the final effect to fail Target value.

So is the stirring speed we usually say is the shear speed? High school physics knowledge teaches us that one speed is angular speed and the other is linear speed. Shear speed naturally refers to the linear speed, which is equal to the angular speed multiplied by π times the diameter. This is why the speed of the emulsifier used in industrial production generally only reaches 3000rpm or 1500rpm, while the speed of the laboratory emulsifier is as high as 10000rpm or even 280000rpm , Is to consider the diameter of the shadow lane, so that the two shear line speeds tend to be the same, and the final effect is almost the same.

From another point of view, the characteristic of laboratory experiments is that the amount is not large. Therefore, if the size of the rotor and stator is suitable for the corresponding small amount, the diameter must be reduced. In order to supplement the negative effect of the small diameter on the linear velocity, it must be increased. The angular velocity of the rotation has thus reached the "high speed" of the experimental instrument. Therefore, the rotation speed of the emulsifier must be combined with the actual processing capacity. However, considering the existing processing level and economic effects of production, the speed of 3000rpm of a 2-pole motor is generally used under 18.5KW, while a 4-pole motor is generally used for 22KW to 55KW. 1500rpm, if higher than 75KW, 1000rpm of 6-pole motor can be considered