Sucking device

A sucking device, comprising:

• a tubular body comprising a sidewall, a through hole surrounded by the sidewall and an air distributing portion received in the through hole and engaged with an inner surface of the sidewall, the air distributing portion arranged adjacent to a distal end of the tubular body, the air distributing portion comprising a central air passage and a plurality of peripheral air passages surrounding the central air passage, the tubular body further comprising a first inner step and a second inner step in the through hole, the first step tapering towards the distal end, and the second step facing toward the distal end and extending outwards along a radial direction of the tubular body;
• and
• an engaging member comprising a bottom plate received in the through hole at the distal end and an engaging portion extending from the bottom plate, the engaging portion insertably engaged in the central air passage, wherein a gap is maintained between a circumferential outer surface of the bottom plate and the inner surface of the tubular sidewall, and the gap is in communication with the through hole through the peripheral air passages.