Laboratory vacuum pumps _ how to choose

vacuum pump is the use of machinery, physics, chemistry or physical chemistry method fit for vacuum pump container device or equipment. Usually, the vacuum pump is to use various methods to improve, to create and maintain a closed space in the vacuum device.

laboratory of vacuum pump is more and more widely used, most of the laboratory equipment are equipped with a vacuum water pump. Due to the vacuum pump is not a single device, thus can be used together with other instruments. Such as vacuum suction, microbiological testing, liquid extract, rotary evaporator, vacuum drying oven, freeze drying machine and other equipment. Vacuum pump is the auxiliary equipment of each lab. Different instruments and equipment of vacuum pump have different requirements. The following describes the types of vacuum pump is commonly used in laboratory.

laboratory vacuum pumps are usually divided into dry type and dry type dry vacuum pump:

dry vacuum pump, also known as oil-free vacuum pump, its characteristic is to rely on the machine parts to achieve the required vacuum, clean and maintain. In the laboratory is the most used oil free piston ( Used in microbiology laboratory) And corrosion diaphragm type ( Used in chemical laboratory) 。 Not dry vacuum pump:

the dry vacuum pump oil is usually divided into vacuum pump and vacuum pump water circulation. The dry vacuum pump have in common is that it need to other material ( Such as oil and water) To achieve the required degree of vacuum. In the laboratory is the most used oil type rotary vane pump, it is usually used with freeze drying and vacuum drying oven.

laboratory vacuum pump choice:

how to choose the vacuum pump for laboratory use. First of all, we must understand the use of vacuum water pump and the extraction of gas is corrosive. Usually, the filter samples, and can choose oil-free vacuum water pump. Need for reagent purification, the corrosion of the vacuum pump; Second, the vacuum pump configuration is used to consider other instruments. If used to configure rotary evaporator, you must use the corrosion of the vacuum pump. Volatile and volatile corrosive gases. When used for drying box, you can select the higher vacuum degree of vacuum pump, such as the dry vacuum pump in the pump. 。

vacuum degree calculation

most of the vacuum is concentrated in the laboratory, for more than 2 mbar in the field of low vacuum, suction time follow these relations

T = V/Se x 1. 303log10( P1/P2)

formula:

P1 - — In the early pressure ( Atmospheric pressure) ( Pa]

P2 - — [to pressure Pa]

T - — Extraction time [ 分钟)

V - — Volume [ L]

Se— — The actual extraction rate [ L / min)

considering the effect of piping and valves, actual extraction speed by 80% for theoretical extraction speed

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