Patent ID: 6382935
Filing Date: 2002-05-07
Classification: F04B,H02K

Abstract:
An electromagnetic diaphragm pump having an AC power supply and a plurality of compression sections operated by an AC supplied from the AC power supply, each of the compression sections comprising:a housing; an oscillator disposed within the housing and holding a permanent magnet; a pair of diaphragms each having a peripheral portion fixed to said housing and a central portion fixed to an end portion of the oscillator, each of the diaphragms supporting the oscillator so as to be able to vibrate in a direction perpendicular to a plane in which the diaphragm is disposed; a pair of field cores sandwiching the oscillator and having magnetic poles displaced relative to the permanent magnet by a predetermined amount in a direction of vibration of the oscillator; coils wound around one of said pair of field cores, wherein said coils are supplied with an AC from the AC supply to produce magnetic fluxes at said field cores; compression chambers defined within the housing to be opposed to end portions of the oscillator, one of walls of each of the compression chambers being formed by an associated one of said diaphragms; and inlet ports with valves capable of drawing air into the compression chamber and outlet ports with valves capable of forcing air out of the compression chamber, the inlet ports and outlet ports being formed within the housing, wherein said field cores have the magnetic poles magnetized by the AC supplied to the coils, whereby the permanent magnet is alternately attracted and repelled by the magnetic poles to vibrate the diaphragms, adjacent two of the compression sections have one shared field core, said plurality of compression sections have a shared housing and said shared housing has head covers integrally covering a plurality of said diaphragms or adjacent ones on the compression sections and constituting the other walls of the compression chambers of said adjacent compression sections, and said inlet ports and said outlet ports are formed in said head covers.