DIAPHRAGM AIR PUMP

摘要

A simply constructed space saving diaphragm air pump in which air suction noise is effectively reduced. A diaphragm (3) to which a piezoelectric element (9) is bonded is supported by a housing (2) to form a pump chamber (5) between the housing (2) and the diaphragm (3). The diaphragm (3) has a vibration area located on the opposite side of the pump chamber (5), and the vibration area is covered with a cover (4) to form a sound muffling chamber (6). The diaphragm (3) and a vibration body (7) including the piezoelectric element (9) are resonated to flexurally vibrate, and air sucked from an air inlet opening (45) formed in the cover (4) is compressed by the pump chamber (5) to be discharged from a discharge opening (23). Air suction noise produced by air when it passes through a communication hole (31) leading from the sound muffling chamber (6) to the pump chamber (5) is reduced by the sound muffling effect of the sound muffling chamber (6).