Filtering Device

A filtering device, comprising:

• a filter layer (1), wherein the filter layer (1) is enclosed into a cylindrical structure;
• and
• a support frame, wherein the support frame comprises at least one support ring (2) arranged at at least one end of the cylindrical structure,
• each of the at least one support ring (2) is provided with a plurality of elastic connection portions (23) and a plurality of support ring segments, and end portions of two adjacent support ring segments are connected to each other by using one elastic connection portion (23);
• the elastic connection portion (23) is capable of being elastically deformed when subjected to an external force and capable of restoring by using its own elastic force;
• when the elastic connection portion (23) is subjected to the external force and elastically deformed, an angle at which the end portions of the two adjacent support ring segments are connected changes, which drives a shape of the filter layer (1) to change synchronously;
• and
• when the elastic connection portion (23) restores by using its own elastic force, the angle at which the end portions of the two adjacent support ring segments changes, which drives the filter layer (1) to restore to an original shape, and the original shape is a shape in which the filter layer (1) is when in use.