Aeration Compressors with Excellent Efficiency 

With the new AP series, Gardner Denver Thomas (Germany) is once again introducing a series of new linear diaphragm compressors. In contrast to motor drives, linear drives have an armature with a permanent magnet that is moved back and forth between two electromagnets (solenoid) in time with the mains frequency. The armature itself is mounted between the two opposing diaphragms of the pump heads. This technology reduces the wear parts to a minimum which guarantees a very long service life. In practical application, 20,000 operating hours or more are achieved.

The use of Neodym magnetic material made it possible to greatly increase the field strength and thus the efficiency of the linear drive. At the same time, the size was greatly decreased by increasing the power density. The data of the new AP series AP-40, AP-60, and AP-80 speaks for itself. For example, the power consumption is only between 0.63 and 0.53 Watts per l/min with a counter-pressure of 150 mbar. The volume flows here are between 46 and 86 l/min. The maximum pressure is now 300 mbar.

All screws for opening the compressor are now accessible from the top and greatly simplify the replacement of the pump block after approx. 20,000 operating hours. A diaphragm safety switch, which is triggered when the deflection of the armature is too great (caused by transport or in case of a tear in the diaphragm), is also accessible from the top by means of the cover of the filter and thus be reset.

Due to the smaller dimensions and the low weight of only 4.7 kg, installation in switchboxes, for example, is simplified.

Linear compressors by Thomas are used in various applications. Manufacturers of small wastewater treatment systems primarily use the technology for the aeration of wastewater and sludge. Due to their excellent efficiency, the compressors are also used for primary air supply in fuel cells.