Cleanable filter system

A cleanable filter system for dust-laden gas, comprising:

• a filter housing including an inlet for the dust-laden gas and an outer annular gap volume disposed about an inner volume, the inner volume and the outer annular gap volume extending axisymmetrically about a bisecting line and being separated from one another by at least one gas-permeable wall;
• a submicron particulate filter disposed in the inner volume;
• a discharge pipe sealingly disposed in the inner volume axisymmetrically about the bisecting line, the discharge pipe having a peripheral cylindrical surface that is gas-permeable and covered by the submicron particulate filter;
• and
• a purge-gas conduit disposed in the discharge pipe, the purge-gas conduit being configured to be rotationally driven about the bisecting line, the purge-gas conduit having at least one radially outwardly directed nozzle disposed in a region of the submicron particulate filter.

A vacuum cleaner comprising:

• a suction aggregate;
• and
• a cleanable filter system including:
• a filter housing including an inlet for dust-laden gas and an outer annular gap volume disposed about an inner volume, the inner volume and the outer annular gap volume extending axisymmetrically about a bisecting line and being separated from one another by at least one gas-permeable wall;
• a submicron particulate filter disposed in the inner volume;
• a discharge pipe connected to the suction aggregate at a first end and sealingly disposed at a second end in the inner volume axisymmetrically about the bisecting line, the discharge pipe having a peripheral cylindrical surface that is gas-permeable and covered by the submicron particulate filter;
• and
• a purge-gas conduit disposed in the discharge pipe, the purge-gas conduit being configured to be rotationally driven about the bisecting line, the purge-gas conduit having at least one radially outwardly directed nozzle disposed in a region of the submicron particulate filter.