Multi-disc air diffuser

A multi-disc air diffuser comprising:

• a bolt having a vent groove formed in a longitudinal direction thereof;
• a plurality of discs, each of the discs having a bolt joint section formed at a center thereof through which the bolt passes, an air room for holding the air supplied through the vent groove, and a nozzle section having a plurality of nozzles which are arranged in an end part of the air room at a regular size and intervals, wherein the lower surface of each of the discs is more than the upper surface thereof and the outer circumference surface of each of the discs is formed to be inclined;
• and
• a backflow prevention section for joining to an end part of the bolt to adhere closely the discs to one another, connecting the vent groove to an air supply pipe, and having a check valve which prevents the air flowing backward from the vent groove to the air supply pipe;
• wherein each two discs being adjacent to each other are arranged that a lower surface of an upper disc is adhered closely to an upper surface of a lower disc and the air nozzle formed on the upper surface of the lower disc is exposed outside of the outer circumference of the upper disc,
• wherein a plurality of supporting protrusions are protruded around the bolt joint section to support a load applied in the center part of the discs.