Filter

The utility model relates to the field of air purification systems, in particular to a filter which comprises a filter assembly and a drainage assembly, the air inlet end of the filter assembly is connected with the air outlet end of an air compressor, the air outlet end of the filter assembly is connected with air injection equipment, and the drainage assembly comprises a drainage pipe communicated between the filter assembly and the air compressor. The technical problem that in the prior art, after condensate water in an air purification system enters a filter assembly, the service life of a filter element is shortened is solved. 本实用新型涉及空气净化系统领域，具体是一种过滤器，包括过滤组件和排水组件，所述过滤组件的进气端连接空压机的出气端，所述过滤组件的出气端连接喷气设备，所述排水组件包括连通在所述过滤组件与所述空压机之间的排水管，所述排水管上设置有自动排水阀，解决现有技术中的空气净化系统内的冷凝水进入过滤组件后会减少滤芯的使用寿命的技术问题。