Water fullness alarm device and a dehumidifier

A method, comprising:

• forming a water fullness alarm device, the water fullness alarm device having an alarm switch;
• a bracket;
• and a float,
• wherein the alarm switch includes an alarm switch body and a switch button disposed on the alarm switch body, wherein the switch button is adjacent to an elastic piece, and wherein a first end of the elastic piece is fixed on the alarm switch body and a second end of the elastic piece is free,
• wherein the bracket is rotatable, wherein a first end of the bracket is connected with the float, and wherein a second end of the bracket comprises a flange that is propped against the elastic piece,
• wherein the first end and the second end of the bracket are integrally formed such that the second end swings synchronously with the first end around an axis when the bracket rotates, and
• wherein the second end of the bracket drives the elastic piece to trigger the switch button when the bracket rotates,
• wherein a contour of the flange is smooth and continuous such that when the bracket rotates, the elastic piece remains in contact with the flange,
• wherein as a rotation angle of the bracket gradually increases, a ratio of a unit change of a horizontal distance between the axis of the bracket and a contact point between the flange and the elastic piece to a unit change of rotation angle of the bracket gradually increases.