1. The vacuum degree required by the process The working pressure of the vacuum pump should meet the process working pressure requirements, and the vacuum degree should be half to one order of magnitude higher than the vacuum degree of the vacuum equipment during model selection. (For example, the vacuum process requires a vacuum degree of 100Pa, and the vacuum degree of the selected vacuum pump should be at least 50Pa-10Pa). Generally, if the absolute pressure is required to be higher than 3300Pa, the water ring vacuum pump is preferred as the vacuum device. If the absolute pressure requirement is lower than 3300Pa, the water ring vacuum pump cannot be selected, and the rotary vane vacuum pump or a vacuum pump with a higher vacuum level is selected as the vacuum. Get the device.

2. The pumping volume (pumping rate) required by the process The vacuum pump requires the pumping rate (that is, the ability of the vacuum pump to discharge gas, liquid, and solid under its working pressure), general units: m3/h, L/S, m3 /min. The specific calculation method can refer to the following formula to calculate and select by yourself. Of course, the selection of vacuum pumps is a comprehensive process, involving factors such as relevant experience. S=(V/t)×ln(P1/P2)

S is the pumping rate of the vacuum pump (L/s) V is the volume of the vacuum chamber (L) t is the time required to reach the required vacuum degree (s) P1 is the initial pressure (Pa) P2 is the required pressure (Pa)

3. Determine the composition of the object being pumped

① Is the object being pumped a gas, liquid, or particle? If the pumped gas contains water vapor or a small number of particles and dust and other impurities, the rotary vane vacuum pump should be carefully selected. If the vacuum degree is required to be high, a filter device should be added to filter it before the rotary vane vacuum pump can be used as vacuum-obtaining equipment.

②It is necessary to know whether the object being pumped is corroded. If the gas contains factors such as acid-base corrosion or organic corrosion, it should be filtered or neutralized before the rotary vane vacuum pump can be selected.

③ Does the pumped object pollute the rubber or oil? Corresponding vacuum equipment should be selected for different pumped media. If the gas contains a large amount of vapor, particles, and corrosive gases, it should be considered to install corresponding auxiliary equipment on the inlet pipeline of the pump, such as condensers, filters, etc.

In addition to the above factors, other factors such as noise, price, etc. should be considered.

Dongguan Microvacuum Technology Co., Ltd. is a professional manufacturer of oil-free piston vacuum pumps and air compressors. With more than 15 years of product development and manufacturing experience, it has the latest complete sets of production equipment, as well as advanced testing equipment.