Which parameters should be paid attention to when selecting vacuum pump
By RUNNINGWAY
September 7th, 2026
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Which parameters should be paid attention to when selecting vacuum pump
There are many types of vacuum pumps, facing complex working conditions and application fields, so there are many factors involved in the selection of vacuum pumps. To discuss with you the six basic precautions that need attention.
1.In the selection of vacuum pump, the determined products shall ensure that various gases released during the process can be extracted smoothly.
In the application process of vacuum pump, there are many kinds of gas media, such as flammable and explosive, easy to condense, easy to reverse, easy to corrode, etc. the selected vacuum pump needs to ensure its applicability. For example, the process will produce a large amount of steam, so the vacuum pump selected must be suitable for pumping steam.
2.The limit vacuum degree of the vacuum pump must be at least one order of magnitude higher than the vacuum degree required by the process production, and the equipment is suitable for working within the required working vacuum degree.
The limit vacuum degree of a vacuum pump is the vacuum degree that can be reached when the pumping speed is zero. Therefore, in order to ensure the pumping speed of the vacuum pump within the working vacuum degree, it is necessary to meet its limit vacuum degree to be greater than the working vacuum degree, and a large pumping speed is required in the interval.
3.The pumping speed of the vacuum pump should be greater than the large amount of gas released in the process.
In order to ensure the vacuum degree, if the selection of the vacuum pump involves the continuous bleeding in the process, the pumping speed of the vacuum pump or vacuum system shall be greater than the large amount of bleeding in the process. If the system is equipped with a cold trap or baffle, the effective pumping speed after adding the trap or baffle shall be greater than the large amount of gas discharged in the process. In case of sudden large amount of air bleeding during the process, the effective pumping speed of the system shall be appropriately increased, usually 2-3 times of the large amount of air bleeding.
4.In the selection of vacuum pump, the working medium and manufacturing materials of the selected vacuum pump must meet the process requirements.
In the application of vacuum pump, especially in the fields of medicine, chemical industry, battery, etc., the medium extracted is often corrosive gas. At this time, corresponding anti-corrosion measures are required for the equipment. For example, the acid-base gas needs to have corresponding anti-corrosion coating or the material of the pump should be stainless steel for anti-corrosion; In case of gas with dust or particles, a dust collector, filter or the pump itself shall be added in front of the pump inlet to make it resistant.
5.In the process of continuous production, the selected vacuum pump must meet the needs of continuous production. If necessary, a standby vacuum pump with automatic replacement shall be set to reduce production interruption caused by accident. If the amount of air bleeding becomes smaller and smaller during the process, a maintenance pump can be set to save energy and reduce consumption.
6.Economical use of vacuum pump.
In the process of vacuum pump selection, when a variety of vacuum pumps can meet the process requirements at the same time, the economic analysis of costs and operating expenses shall be carried out, and the vacuum pump with good economy, reliable operation, small amount of maintenance and convenient use and maintenance shall be selected.
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