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How to choose a vacuum pump in the laboratory?

Technical Knowledge 2020-09-29 17:39:22
How to choose the vacuum pump used in the laboratory is a problem that plagues many users. After buying a vacuum pump, many users will encounter the vacuum gauge to observe that the vacuum is not enough (not enough suction), the pumping speed is too slow, and it is used in a relatively closed room. Excessive noise, or oil mist when the pump is in use, can not be used normally, and other problems. These problems are often related to the selection.

The general user may not be able to figure out the relationship between the various parameters of the vacuum pump and the actual use effect. Generally speaking, the user mainly considers the following factors when purchasing a laboratory vacuum meter:

1. Do you need to ensure that there is no pollution in the use environment: Some vacuum pumps need to use other media to assist the operation of the pump due to the design principle, such as oil rotary vane vacuum pumps and water circulation vacuum pumps, which need to pour the pump oil and connect the water source respectively. When the pump oil is in use, the oil mist will be emitted into the air, polluting the environment; and the pump must be connected to the water source where it is used. However, some customers who need to pump cell culture supernatant in the clean room of the cell room cannot use this type of product. At this time, you should choose an oil-free vacuum pump, which can be used after plugging in.

2. What kind of equipment is used together: different equipments are used for different purposes, some require higher vacuum, such as vacuum distillation; some require higher pumping speed, such as a vacuum drying oven, which needs to be considered The internal volume of the box; and the application of vacuum filtration is more complicated. It is necessary to investigate the filtrate capacity of the filtration, the content of particulate matter in the liquid, and then choose the appropriate vacuum or pumping speed product according to different situations.

3. The volume of the matching equipment: the volume of the equipment is related to the pumping speed parameters of the vacuum pump. For example, when matching with a general 1000ml vacuum filter bottle, I only need to use a small vacuum filter pump with a pumping speed of 20L/min. need. However, when using a larger-volume vacuum filter bottle or a multiple filter, you need to select a suction pump with a higher pumping speed for different sizes of filters.

4. What accessories are needed to ensure normal use: The lack of accessories during the use of some vacuum systems may make the operation very difficult. For example, the vacuum control valve has a very important role for many purposes. You can observe the working status of the system and adjust the pumping speed according to actual needs. When performing vacuum filtration, the anti-suck-back accessory set, including buffer bottles and water blocking filters, will effectively avoid the problem of back-suction damaging the vacuum pump. It is a very useful accessory, such as a water-blocking filter with a built-in hydrophobic membrane. , The air can pass, but 100% of the liquid cannot pass, which can completely solve the problem of back suction. When purchasing a vacuum pump, you should pay attention to directly configure the necessary accessories according to different applications.

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