Composite filter body

A composite filter body, comprising:

• a front filter layer, the front filter layer being a structure made of bamboo fiber material, and the front filter layer being used for pre-filtering air;
• and
• a main filter layer is stacked with the front filter layer, the main filter layer is communicated with the front filter layer, the main filter layer is one or a combination of multiple layers selected from a glass fiber layer, an activated carbon layer,
• a rear filter layer;
• the rear filter layer, the main filter layer, and the front filter layer are sequentially stacked in a thickness direction of the composite filter body, the rear filter layer is communicated with the main filter layer, the rear filter layer is a structure made of bamboo fiber material, and the rear filter layer is used for post-filtering the air processed by the main filter layer;
• a first interlayer connection structure provided between the front filter layer and the main filter layer, the first interlayer connection structure being used for fixing the front filter layer and the main filter layer together;
• the first interlayer connection structure can be a suture connection structure;
• a second interlayer connection structure is provided between the main filter layer and the rear filter layer, and the second interlayer connection structure is used for fixing the main filter layer and the rear filter layer together;
• the second interlayer connection structure can be any one of the following:
• a suture connection structure.