Pressure sensor for an electric household appliance with additional security function

摘要

A pressure sensor including: a casing fluid-tightly divided into a first and a second chamber by a deformable membrane and means for connecting the first chamber to the environment and the second chamber to a tank for an operative fluid of an electric household appliance for detecting the level thereof according to a deformation of the membrane upon the establishment of a differential pressure in the two chambers; wherein the membrane carries toward the first chamber a rigid disc operatively associated with a switch carried by the casing to either close or open the switch upon the deformation of the membrane beyond a predetermined entity.

主权项

1. A pressure sensor comprising a casing and a deformable membrane accommodated in the casing so as to fluid-tightly divide the interior of the same into a first and a second chamber, the casing being provided with means for connecting the first chamber to the atmospheric environment and the second chamber, by means of a tube normally full of air, to a sump or collection tank of an operative fluid of an electric household appliance for detecting the level thereof according to a deformation of the membrane upon the establishment of a differential pressure in the two chambers; wherein the membrane carries a rigid disc at least on the side of the first chamber; characterized in that the rigid disc is operatively associated with a switch carried by the casing and adapted to be either closed or opened thereby upon the deformation of the membrane beyond a predetermined entity.