Patent ID: 9441623
Filing Date: 2016-09-13
CPC Classification: F04B

Claim Text:
1. An electromagnetic vibrating diaphragm pump for suction and discharging of a fluid by carrying out reciprocating vibration of an oscillator using a magnetic action and driving a pair of disc-like diaphragms provided at both ends of the oscillator, wherein each of the disc-like diaphragms is sandwiched from both sides thereof by center plates comprising a pair of disc-like plates, the center plates comprise a first plate having a plurality of convex portions formed on its surface coming into contact with the diaphragm and a second plate arranged opposite to the first plate and having a plurality of concave portions into which the convex portion are press-fitted, the convex portions of the first plate are press-fitted to the concave portions of the second plate through an opening formed at the center of the diaphragm, disc-like protrusions for preventing the diaphragm from being pressed out which protrude from both surfaces of the diaphragm are formed on the periphery of the opening of the diaphragm, and ring ribs engaging with the protrusions for preventing the diaphragm from being pressed out from the outer side in a radial direction of the diaphragm are formed on the first plate and the second plate respectively, wherein the first plate comprises a fitting groove for fitting the protrusion for preventing the diaphragm from being pressed out, the second plate comprises a fitting groove for fitting the protrusion for preventing the diaphragm from being pressed out,