The function of the vacuum pump is to remove gas molecules from the vacuum chamber and reduce the gas pressure in the vacuum chamber to achieve the required vacuum.
Laboratory vacuum pumps are used more and more widely, and most laboratory equipment is equipped with a vacuum pump. Because the vacuum pump is not a single device, it can be used with other instruments. Such as vacuum suction filtration, microbial detection, waste liquid extraction, rotary evaporator, vacuum drying oven, freeze dryer and other equipment. Vacuum pumps are ancillary equipment for each laboratory. Different instruments and equipment have different requirements for vacuum pumps. The following describes the types of vacuum pumps commonly used in the laboratory.
Laboratory vacuum pumps are generally classified into dry and non-dry types.
Dry vacuum pump:
Dry vacuum pumps, also known as oil-free vacuum pumps, are characterized by relying on the machine's own components to achieve the required vacuum, without contamination and maintenance. The most used in the laboratory are oil-free piston type (used in microbiology laboratories) and corrosion-resistant diaphragm type (used in chemical laboratories).
Non-dry vacuum pump:
Non-dry vacuum pumps are generally classified into oil vacuum pumps and water circulation vacuum pumps. The common point of the non-dry vacuum pump is that it needs to achieve the desired degree of vacuum by means of other substances (such as water and oil). The most used in the laboratory is the oil type rotary vane pump, which is generally used together with the freeze dryer and vacuum drying oven. .
Laboratory vacuum pump selection:
How to choose a vacuum pump for laboratory use?
The first thing to understand is the use of the vacuum pump, whether the extracted gas is corrosive. Generally, the sample is filtered, and an oil-free vacuum pump can be selected. For reagent purification, a corrosion-resistant vacuum pump is required;
Secondly, the vacuum pump is configured in consideration of other instruments and equipment. If it is used to configure the rotary evaporator, it is necessary to use a corrosion-resistant vacuum pump. The gas that is volatilized and volatilized is corrosive. If it is used in a drying oven, you can choose a vacuum pump with a relatively high vacuum, such as in a non-dry vacuum pump. Oil pump.
Vacuum calculation
Most of the vacuum in the laboratory is concentrated above 2 mbar. In the low vacuum field, the pumping time follows the following relationship.
T=V/Se×1.303log10(P1/P2)
formula:
P1 - initial pressure (atmospheric pressure) [Pa]
P2 - arrival pressure [Pa]
T —— pumping time [min]
V——volume [L]
Se - actual pumping speed [L/min]
Considering the pipeline and valve effects, the actual pumping speed is 80% of the theoretical pumping speed.
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Taiwan Loco Rocker vacuum pump is divided into three series:
1. Oil- free vacuum pump , ideal for cleaning and efficient vacuum pump, unique piston cavity design to ensure long-term operation. Oil-free plunger pumps are commonly used in: laboratory vacuum filtration, vacuum suction, vacuum drying ovens, etc. 
2. Corrosion-resistant vacuum pump , the whole gas path part is not in contact with the metal part of the pump body, and the PTFE film covers the metal part. Diaphragm pumps can be used for vacuuming with corrosive gases such as rotary evaporators, reagent purification, reactors, etc. 
3. Oil-type vacuum pump , vacuum operation is carried out by means of oil seal. The rotary vane pump has a higher vacuum than the plunger pump and the diaphragm pump, and is suitable for equipment requiring high vacuum, such as vacuum drying, vacuum packaging, vacuum coating, etc. 
Taiwan Luoke has more than ten years of professional research and development and production of vacuum pumps, providing customers with the most professional vacuum pump matching options.
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