Drainage device, water pan and air conditioner

The invention provides a drainage device, a water pan and an air conditioner. The drainage device comprises a base (1) and a first valve seat (2), the first valve seat (2) comprises a first valve port (3), a first valve cavity (4) is formed between the first valve seat (2) and the base (1), the section of the first valve cavity (4) is gradually decreased in the direction close to the first valve port (3), and a first floating ball (5) is arranged in the first valve cavity (4) and can float up under the action of condensate water and block the first valve port (3). According to the drainage device, the condensate water can be effectively prevented from overflowing out of the water pan when the water pan inclines, and the reliability of the water pan is improved. 本申请提供一种排水装置、接水盘和空调器。该排水装置包括底座(1)和第一阀座(2)，第一阀座(2)包括第一阀口(3)，第一阀座(2)与底座(1)之间形成第一阀腔(4)，第一阀腔(4)沿着靠近第一阀口(3)的方向截面逐渐变小，第一阀腔(4)内设置有第一浮球(5)，第一浮球(5)能够在冷凝水的作用下上浮，并封堵第一阀口(3)。根据本申请的排水装置，能够有效防止接水盘倾斜时冷凝水从接水盘溢出外界，提高接水盘的可靠性。