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High-vacuum extraction systems as central extraction units
Central high-vacuum extraction systems are designed for applications in which multiple machines, tools, or cleaning stations are to be evacuated via a shared piping network. The system generates the required vacuum, while pipes, hoses, and capture elements direct the airflow to the individual consumption points. Due to the high vacuum levels, comparatively small pipe cross-sections can be used.
Typical plant layout
A complete high-vacuum extraction system consists of more than just the suction unit. The system typically includes filtration technology, dust or material discharge, a piping network, branch lines, shut-off valves, hose connections, and suitable capture elements. Depending on the process, automatic dampers or demand-based control may be advisable.
Typical Applications
✔ Centralized on-tool extraction system in production areas
✔ Extraction systems for grinding, milling, or machining equipment
✔ Multiple cleaning connections in the workshop and production area
✔ Supply of hose reels and stationary connection points
✔ Continuous or demand-driven multi-station systems
Design based on the worst-case operating point
What matters is not the system’s theoretical maximum capacity, but rather the performance still available at the most distant or aerodynamically unfavorable workstation. Pressure loss increases as the length of the piping and the number of fittings increase. At the same time, the air velocity must remain sufficiently high to ensure that particles are transported safely.
| Design parameter | Meaning | Consequences of Incorrect Design |
|---|---|---|
| Negative pressure | Overcoming Resistance Online | Insufficient suction power at the workplace |
| flow rate | Specifies collection and transport | Insufficient extraction or particle buildup |
| Conductor cross-sectional area | affects speed and pressure loss | unnecessary losses or insufficient transport speed |
| Simultaneity | Number of positions filled concurrently | Performance Decline with Repeated Use |
| Filter loading | Resistance and Service Life | Increasing pressure loss and frequent maintenance |
Key Selection Criteria
✔ Type and quantity of material to be extracted
✔ Number of connections and simultaneous operation
✔ Longest and most durable pipeline route
✔ Pipe and hose diameters
✔ Filter design and filter cleaning
✔ Dust extraction and discharge
✔ Desired control and automation
✔ Reserve for future expansions
Demand-Based Control
If not all extraction points are in operation at the same time, automatic damper control or speed control may be advisable. This allows the suction capacity to be adjusted to the points that are actually open. However, the control strategy must be designed in such a way that the required flow velocities in the pipe network are maintained.
Maintenance and Filters
Filter condition, discharge, and airtightness directly affect system performance. Increasing filter resistance reduces the available airflow while suction power remains unchanged. Therefore, easy accessibility, proper filter cleaning, and an emptying strategy suited to the amount of dust are important planning factors.
Safety and ATEX
In the presence of combustible dusts or explosive atmospheres, the entire system must be evaluated. In addition to the extraction unit, the piping system, grounding, filters, discharge, potential ignition sources, and operating conditions must be taken into account.
FAQ
How many workstations can a high-vacuum extraction system serve?
This depends on the amount of air required per workstation, the number of simultaneous operations, and the pressure losses in the piping system.
Can additional extraction points be added later?
Often yes, provided that sufficient capacity and pipeline network reserves were included in the original design.
Why is the longest pipeline route important?
This is where the highest pressure losses often occur. This operating point is therefore particularly relevant for sizing.
Does automatic damper control make sense?
While it may be useful for varying applications, it must be planned in conjunction with suction capacity and the required transport speed.
What happens when a filter becomes clogged?
Pressure loss increases, and the available airflow may decrease. Regular inspection and proper cleaning are therefore important.
Consulting for Central High-Vacuum Extraction Systems
For a preliminary technical design, a simple piping diagram, pipe lengths, connection diameters, the number of simultaneous usage points, and information about the material to be extracted are particularly helpful.
