Laboratory vacuum pumps are used more and more widely, most laboratory equipment will be equipped with vacuum pumps, because vacuum pumps are not a single device, it can be used in conjunction with other instruments. For example, vacuum filtration, microbial detection, waste liquid extraction, rotary evaporator, vacuum drying box, freeze dryer and other equipment. Vacuum pump is the auxiliary equipment of every laboratory. Different instruments and equipments have different requirements for vacuum pumps. The types of vacuum pumps commonly used in laboratories are described below.
Laboratory vacuum pumps can be divided into dry and non-dry types.
Dry vacuum pump:
Dry vacuum pump, also known as oil-free vacuum pump, is characterized by relying on its own components to achieve the required vacuum, pollution-free, maintenance-free. The most commonly used in laboratories are oil-free piston type (mostly used in microbiological laboratories) and corrosion-resistant diaphragm type (mostly used in chemical laboratories).
Non-dry vacuum pump:
Non-dry vacuum pumps can generally be divided into oil vacuum pumps and water circulation vacuum pumps. The common point of non-dry vacuum pump is that it needs to use other substances (such as water and oil) to achieve the ideal vacuum degree. The most used in the laboratory is the oil rotary vane pump, which is generally used in conjunction with freeze-dryer, vacuum drying box and so on.
Laboratory Vacuum Pump Selection:
How to choose a vacuum pump for laboratory use? First of all, we need to understand the use of vacuum pumps, whether the extracted gas is corrosive. Generally, oil-free vacuum pump can be selected for filtering samples. For reagent purification, corrosion-resistant vacuum pumps should be selected; secondly, consideration should be given to the configuration of vacuum pumps in other instruments and equipment. If it is used to configure rotary evaporator, corrosion-resistant vacuum pump must be used. The volatile gas of rotary evaporator is corrosive to a certain extent. If it is used in drying box, vacuum pump with higher vacuum can be selected, such as oil pump in non-dry vacuum pump.
Laboratory vacuum pumps are divided into three series:
1. Oil-free plunger pump, clean and efficient vacuum pump ideal choice, unique piston chamber design, to ensure long-term operation. Oil-free plunger pumps are often used in laboratory vacuum suction, vacuum suction, vacuum drying box, etc. Features: Quiet, low vibration, light weight, small size, pollution-free, maintenance-free, portable design, suitable for outdoor operation.
2. Corrosion-resistant diaphragm pump, the whole air passage does not contact with the metal part of the pump body, PTFE film covers the metal part. Diaphragm pumps can be used to vacuum corrosive gases, such as rotary evaporator, reagent purification, reaction kettle, etc. Features: Vacuum stable and easy to control; chemical corrosion resistance; no consumption of water resources, strong environmental protection performance; small size, light weight; easy to use, clean; durable and stable work; no maintenance, easy maintenance.
3. Rotary vane vacuum pump, vacuum operation by oil seal. Working Principle: When rotating, the inlet has suction, sucks in gas, and excludes it to the outlet without leakage. It runs repeatedly and forms a vacuum at the inlet. Because the whole internal system is sealed with vacuum pump oil, gas leakage rarely occurs. Rotary vane pump has higher vacuum than plunger pump and diaphragm pump. It is suitable for equipment requiring higher vacuum, such as vacuum drying, vacuum packaging, vacuum coating, etc.