Environmental and new energy duties look far apart, but they share one condition: the gas handled is not clean. Dust, condensables and corrosive traces reach the pump chamber and the only question is how soon capacity drops — so filtration and selection are decided together.
Central vacuum cleaning systems
Where workshop cleaning, machine-side extraction and charging points share one vacuum source, the main pump is sized on simultaneous points and total pipe run, not by adding up single-point peaks.
- Size pipe bore by working back from the allowed pressure loss, not from habit; step the bore up from main to branch and use large-radius bends.
- Put drains at low points; for wet cleaning add a water separator ahead of the pump.
- With heavy dust, a cyclone pre-separator plus fine filter ahead of the main pump, both with differential pressure gauges — change elements on pressure, not on the calendar.
Powder and material conveying
Conveying needs flow and a steady vacuum, not an ultimate pressure. Points that matter:
- Convert throughput into required air flow, then add 30 to 50 percent for material build-up and blocked lines.
- Intermittent conveying (suck, then discharge) makes start frequency the deciding factor: for frequent starts go one size up with a buffer vessel, so the motor is not started repeatedly.
- With abrasive powders the inlet filter and pipe bends wear first; leave inspection openings.
Battery production
The vacuum steps in lithium battery production are mainly cell and electrode drying, chamber evacuation before electrolyte filling, and degassing after filling.
| Step | Gas condition | Selection |
|---|---|---|
| Cell / electrode drying | High water vapour, continuous | Oil-sealed vane pump with gas ballast, condenser and water separator; or a dry claw pump |
| Chamber evacuation before filling | Clean, cycle-driven | Oil-free vane or dry claw pump, sized on chamber volume and cycle |
| Degassing after filling | Electrolyte vapour, condensable | Oil-sealed model with cold trap and shortened oil change; dry pump where oil is unacceptable |
| Central works vacuum | Multiple points, continuous | Central system with interlocked rotation of pumps |
Electrolyte vapour changes the oil directly: viscosity and lubricity both shift once absorbed, so the oil change interval has to follow the actual medium rather than a generic table.
Photovoltaic and coating steps
Laminator evacuation and the backing stage of coating or PECVD lines need controllable pump-down time and no oil mist in the chamber. Lamination commonly uses a multi-stage roots set for fast roughing; coating lines use a single- or two-stage oil-sealed vane pump as backing pump. The ratio is set by chamber volume, target pressure and the backing pump’s speed at that same pressure.
Common accessories
- Inlet filtration: mandatory in dusty duty, changed on differential pressure.
- Water separator and cold trap: mandatory where vapour and condensables are present.
- Buffer vessel: absorbs peaks in intermittent and shared use.
- Exhaust treatment: oil mist separator on oil-sealed models, with separate ducting.
Send the process step, gas composition, cycle time and site supply and an engineer will return a model and accessory list. Some models are not suitable for 60 Hz regions; please confirm with us before ordering.