To Learn About The Uses, Classification And Choice Of Vacuum Pump

Two main uses
Generally, there are two main applications of vacuum pumps used in the laboratory: vacuum suction filtration and vacuum drying.

Vacuum suction filtration is an application that uses vacuum pumps, micro vacuum pumps, and other equipment that can provide a vacuum to speed up the separation of solids and liquid mixtures. Vacuum suction filtration is often used in medical, scientific research and other experiments, so in general, large vacuum pumps with large volume, high noise, and high power consumption are not suitable. Micro vacuum pumps and small vacuum pumps are commonly used.

Vacuum drying is a method of lowering the boiling point of the liquid under low pressure, which can boil and evaporate at normal temperatures so that the sample can be dehydrated or solvent, to achieve the sample concentration increase or crystallization.

Vacuum pumps in the laboratory are generally used with a variety of instruments, such as vacuum suction filters, waste extractors, rotary evaporators, vacuum drying ovens, freeze dryers, and other equipment.

hawach rotary vane vacuum pump

Different types of vacuum pumps
The most used in the laboratory is the oil-free piston type (used for microbial testing) and the corrosion-resistant diaphragm type (used for chemical laboratories). The piston-type is generally vacuum suction filtration, microbiological testing, waste liquid extraction, and vacuum drying oven and other equipment supporting use. Corrosion-resistant diaphragm type is generally used with a rotary evaporator, vacuum drying oven, centrifugal concentration, etc.

There are also non-dry vacuum pumps, such as oil vacuum pumps and water circulation vacuum pumps. The common point of non-dry vacuum pumps is that they need to use other substances (such as water and oil) to achieve the ideal vacuum degree. The oil rotary vane pump is the most used in the laboratory, which is generally used in conjunction with freeze dryers and vacuum drying boxes.

Selection of vacuum pumps
When purchasing, we must first understand the role of vacuum pumps in the laboratory, such as vacuum suction filtration and vacuum drying. And whether the air pumped by the vacuum pump is corrosive, such as reagent purification and sample filtration. For filtering samples, oil-free vacuum pumps can be selected. For reagent purification, corrosion-resistant vacuum pumps should be selected.

Secondly, consider the configuration of the vacuum pump in other instruments and equipment. If it is used to configure a rotary evaporator, it is necessary to use a corrosion-resistant vacuum tube, and the vaporized volatile air is somewhat corrosive; if it is used in a drying oven, you can choose a vacuum pump with a relatively high vacuum, such as a rotary vane oil seal pump.