| 摘要 |
There is disclosed a pressure switch (100) for detecting the passing of a threshold level (301) of a liquid (300) in a tank (200). This pressure switch (100) comprising a chamber (11) that is hermetically divided by an impermeable elastic diaphragm (4) into two compartments (111, 112). The first compartment (111) is fillable with liquid (300) coming from a tank (200). The diaphragm (4) is able to become elastically deformed, varying the volume of the two compartments (111, 112) on the basis of the liquid (300) filling status of the first compartment (111). Inventively, the pressure switch (100) communicates with open vertical conduits (16, 22) suitable for enabling first the air in the chamber (111) and then the liquid (300) to exit in a vertical direction on the basis of a thrust due to the pressure of the liquid (300). In this way, it is possible to overcome the drawbacks created by the presence of air that would become compressed inside the chamber (111), and which in the absence of vertical discharge conduits (16, 22) would be generated, and it is thus possible to use this pressure switch in a simple and reliable manner to detect the variation in the level (302, 303) of liquid (300) in the tank (200) (Fig. 2). |
