Auxiliary device for air compressor

The utility model relates to an auxiliary device for an air compressor. Outer funnel, an outer funnel pipe is arranged at the bottom end of the outer funnel; wherein an inner funnel is arranged in theouter funnel; an inner funnel pipe penetrating through the outer funnel pipe is arranged at the bottom end of the inner funnel; gaps are formed between the inner funnel and the outer funnel and between the outer funnel pipe and the inner funnel pipe; u-shaped notches are uniformly formed in the top end of the side wall of the outer funnel; wherein the inner side wall of the outer funnel is provided with a supporting strip contacted with the outer side wall of the inner funnel; a sleeve coaxial with the outer funnel pipe is arranged in the outer funnel pipe, a connecting block is arranged between the outer side wall of the sleeve and the inner side wall of the outer funnel pipe, an internal thread is further arranged in the sleeve, an external thread matched with the internal thread is arranged on the outer side w