For pre-inlet cooling the housing is equipped with an additional third socket on the suction side. The lube oil supply is effected by splash oil lubrication. The conveying chamber is sealed vacuum-tight by a sealing system. The driving shaft is sealed by double radial seal rings with grease barrier. Direction of flow vertical from top to bottom. Drive can be effected via a direct coupling or optionally via narrow V-belt (at limited differential pressure).
AERZEN blowers with canned drive are designed for the conveyance of neutral (HM version) and aggressive (CM version) gases and are especially used in the industrial high-vacuum technology. Canned motor blowers always work in combination with a backing pump*. This backing pump starts operating at atmosphere. The canned motor blower is connected typically at approx. 50 to 200 mbar and the pump down process begins. Depending on the application, liquid ring pumps, sliding vane rotary vacuum pumps, screw vacuum pumps or blowers are used as the backing pump. When supplied with AERZEN frequency converters and special parameter sets, operation with the backing pump starting from atmospheric pressure is also possible.
*An additional backing pump (multi stage system) is always required when using an AERZEN vacuum blower with canned drive.
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