A diffuser includes a base unit defining an internal area, a cover unit, and an electromechanical unit. The cover unit includes an inner cover disposed on the base unit, and an outer cover covering the outer portion of the base unit and the inner cover. The inner cover extends laterally to cover the inner area and extends down into the inner area and fits the base unit. It also forms a communication hole that penetrates inside and outside, and defines an extension that extends into the outer cover for the inner area to communicate. Outlet air passage. The electromechanical unit is disposed in the base unit, can refine the aromatic liquid located in the internal area, and can provide an airflow flowing from the communication hole into the internal area to blow the aromatic liquid to the outside through the air outlet channel. The new type has the characteristics of no leakage.一種擴香機，包含一個界定出一內部區域的機座單元、一個機蓋單元，以及一個機電單元。該機蓋單元包括一個蓋設於該機座單元上的內蓋，以及一個罩設於該機座單元與該內蓋外的外罩。該內蓋橫向延伸遮蓋住該內部區域且往下延伸進該內部區域並貼合該機座單元，還形成有一個內外貫通的連通孔，並界定出一個延伸進該外罩以供該內部區域連通外界的出氣通道。該機電單元設置在該機座單元中，能將位於該內部區域中的芳香液體細化，並能提供自該連通孔流入該內部區域以將該芳香液體經該出氣通道吹至外界的氣流。本新型具有不漏液的特點。
