Mortar pump for pumping airgel- and perlite-based insulating plaster.

摘要

Insulating plaster serves to insulate building envelopes. It consists in its volume of 75% to 90% of glazed and thus closed on its surface, filled with air balls of expanded silica sand or expanded perlite. These pearlite spheres are mixed with binders, additives as binders, an air entrainment and / or other chemical additives as condenser and / or rapid binder. This insulating plaster is tricky to pump. The mortar pump according to the invention for pumping pearlite-based insulating cladding consists of a jacket (5) and a rotor extending in the tube direction with its axis (25) in the form of an eccentric screw conveyor (1). The jacket (5), which encloses the rotor as a stator enveloping, is resilient in the radial direction to the rotor axis, and the jacket (5) is surrounded from its outside by a peripheral tube (6), so that between the peripheral tube (6) and shell ( 5) a cavity (9) is formed, which is filled with a fluid whose pressure is variable. As a result, a distance between shell (5) and screw conveyor (1) can always be maintained, which allows a gentle pumping with up to three times longer service life than with conventional mortar pumps.