Vacuum pump manufacturers explain how to classify vacuum pumps

One of the most common operations in the food industry is the use of vacuum pumps to move liquids or solids from one location or processing step to another. The main parts of pump transportation are pipeline system and vacuum pump. Vacuum pumps are very different in type and principle. The selection should be based on the characteristics of the material to be conveyed. The most common type of vacuum pump is gear pump. No matter what kind of vacuum pump, the rotor rotates in the pump chamber, resulting in pressure difference. Inhaled food enters the pump chamber and constantly extrudes it. Obviously, a closed working chamber must be formed between the gear of this kind of pump and the pump chamber. Although such pumps are also used to transport liquids and slurries, and sometimes to transport materials with small blocks, it is possible to crush materials. Single screw pump may be an ideal device for conveying bulk materials with less crushing. This kind of pump is also called propelling cavity pump. It can form a continuous spiral space between the spiral rotor and the outer wall. When the rotor rotates, the food is pushed into the same size space by the helical inclined plane. Therefore, food such as corn kernels, grapes and even shrimps will not be destroyed.

Whatever type of vacuum pump is chosen, it should be noted that it is easy to disassemble and thoroughly clean up. The stainless steel sanitary pump commonly used nowadays can be disassembled in a few minutes with simple tools, which is very convenient.

Classification of Vacuum Pumps by Performance, Structure and Working Principle

(1) Classification by performance characteristics and use

(1) Low vacuum pump: The vacuum pump whose limit pressure is higher than 1.33Pa belongs to low vacuum pump. Common are reciprocating vacuum pump, rotary vacuum pump, water ring vacuum pump, jet vacuum pump and adsorption vacuum pump.

(2) Medium vacuum pump: the vacuum pump with the limit pressure between 10-2 and 1.33 PA belongs to the medium vacuum pump. Common are Roots vacuum pump, multi-stage jet vacuum pump and so on.

(3) High vacuum pump: vacuum pump with limit pressure of 10-6-10-2 PA belongs to high vacuum pump. Various diffusion pumps and molecular pumps belong to high vacuum pumps.

(4) Ultra-high vacuum pump: the vacuum pump whose limit pressure is less than 10-6 Pa belongs to ultra-high vacuum pump. Ultra-high vacuum pumps mainly include ion pumps, cryopumps and so on.

(2) Classification according to structural characteristics

Mechanical Volumetric Vacuum pump: This kind of pump relies on mechanical action to make the working volume of pump chamber change periodically to achieve the pumping effect. For example, reciprocating vacuum pumps and rotary mechanical pumps belong to this kind of pumps.

(2) Jet vacuum pump: This kind of pump has no mechanical moving parts. It mainly relies on the high-speed jet through the nozzle to vacuum. These pumps include steam jet pump, air jet pump, water jet pump and various diffusion pumps.

(3) Other types of vacuum pumps: most of these pumps belong to those that can obtain high vacuum, extremely high vacuum or high purity vacuum pumps, such as adsorption pumps, molecular pumps, ion pumps, condensation pumps, etc.

(3) According to the working principle, this is the basic classification of vacuum pumps. According to different working principles, various vacuum pumps can be divided into reciprocating, rotary vane, slide valve, mechanical pressurization, jet pump, diffusion pump, molecular pump, ion pump, condensation pump, etc.

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