Vacuum Pump Selection Guide
Vacuum Pump Selection Guide
Vacuum degree and flow rate are the two most important factors in choosing a suitable vacuum product
A: Flow rate: It determines the size of the product. The higher the flow rate requirement, the larger the product volume is, and the higher the motor power required will be. The following is the conversion table of some commonly used flow units.
Flow Unit Conversion Table
| m3/h | 1l/min | 1cfm(ft3min-1) | |
| 1m3/h | 1 | 16.67 | 0.588 |
| 1l/min | 6×10-2 | 1 | 3.528×10-2 |
| 1cfm(ft3min-1) | 1.699 | 28.32 | 1 |
B: Vacuum degree: It determines what kind of structure the product adopts. The vacuum degree has two readings of gauge pressure and absolute pressure. Absolute pressure means that the reading is an absolute value, that is, the closer the reading is to '0', the higher the vacuum. But looking at the surface pressure, the closer it is to 760mmHɡ, the higher the degree of vacuum. If the absolute pressure (ultimate vacuum) you require is close to '0', then only a vacuum pump can meet this demand, but if the demand is close to 1bar (that is, the atmosphere pressure), then you can choose a blower or a centrifugal fan to meet this demand. The following is a conversion table of some common pressure units.
Pressure Unit Conversion Table
| Mbar | Pa | Rorr | 1kɡ/cm2 | |
| 1mbar | 1 | 102 | 0.75 | 1.02×10-3 |
| 1pa | 0.01 | 1 | 7.5×10-3 | 1.02×10-5 |
| 1torr(mmHɡ) | 1.333 | 1.333×102 | 1 | 1.36×10-3 |
| 1kɡ/cm2 | 9.807×102 | 9.807×104 | 7.356×102 | 1 |
When selecting vacuum products according to the above two factors, you will find that there may be a variety of different series of products that can meet your needs. The coefficients provided above can help you choose the most suitable product.
Temperature coefficient: the room temperature and the temperature of the gas sucked into the vacuum pump. The higher the reading of this coefficient, the more efficient the product needs to be designed to dissipate heat, and the oil-lubricated vacuum pump is a better choice.
Environmental factor: the noise, heat and environmental pollution caused by vacuum products. Dry-running vacuum pumps will not cause any pollution to the environment but will bring out higher noise decibels and heat.
Gas composition coefficient: Whether the gas sucked into the vacuum pump contains high water content or is corrosive, Poly can provide anti-corrosion products to meet the needs.