Respirator

A respirator, wherein the respirator comprises an outer housing, a filter, an end cover, the filter being arranged on the outer housing, and a plurality of position-limiting devices matching each other, wherein a position-limiting device of the plurality of position-limiting devices is provided on the end cover, wherein the other position-limiting device of the plurality of position-limiting devices is provided on the outer housing, wherein the plurality of position-limiting devices is used for fixing the filter at the outer housing, and

• wherein the position-limiting device on the outer housing comprises a rod, the rod being fixed at the filter, a plurality of ribs being formed in a longitudinal direction of the rod and provided on an outer peripheral edge of the rod, the position-limiting device on the end cover comprising recesses, and one end of the plurality of ribs engaging with the recesses.