Patent ID: 6907816
Filing Date: 2005-06-21
Classification: F04B

Abstract:
1. A safety diaphragm for a diaphragm pump comprising at least two diaphragm layers ( 1 , 2 ) each having opposing inner and outer surfaces and a peripheral edge and arranged so that the inner surfaces of the diaphragm layers are adjacent each other, said diaphragm from the peripheral edge towards a center having a clamping region (E) running in a peripheral direction for fixing the diaphragm in a pump and having an adjacent operational region (A) from the clamping region (E) toward the center; said diaphragm layers ( 1 , 2 ) being connected to each other so that they are sealed against penetration of liquid and/or gas between the diaphragm layers and so that there is atmospheric or subatmospheric pressure between the diaphragm layers ( 1 , 2 ) and so that the diaphragm layers remain sealed to each other in the area of the clamping region, against penetration of liquid and/or gas between the layers in the area of the clamping region in the event of rupture of one of the layers; said diaphragm in one section of the clamping region (E) comprising a sensor region (S) where the diaphragm layers ( 1 , 2 ) are formed to deform more easily than in the other sections of the diaphragm so that an increase in pressure between the diaphragm layers ( 1 , 2 ), due to failure of a diaphragm layer, causes a detectable increase in distance between the diaphragm layers in sensor region (S).