Rotary paddle level switch

摘要

A rotary paddle level switch has a housing, a driving unit, two switches, a resilient member, a clutch, a transmission shaft, and a propeller. A resilient clip of the clutch holds a non-circular actuation section of the transmission shaft. When the driving unit drives the clutch to rotate, the transmission shaft and the propeller are driven by the clutch. When the propeller is rapidly rotated by suddenly exerting an excessively large external force thereon, as the resilient clip holds the transmission shaft by elastic force, the fast rotating transmission shaft removes itself from the holding of the resilient clip and is rotated without driving the resilient clip to rotate, thereby avoiding the transmission of the external force and damage to the driving unit. As the clutch just needs a clutch stand and a resilient clip to achieve the foregoing function, the level switch is structurally simple and relatively inexpensive.

主权项

1. A rotary paddle level switch, comprising:
a housing; a circuit board mounted inside the housing; a driving unit rotatably mounted inside the housing, electrically connected to the circuit board, and having a pressing member and an output member, wherein the pressing member and the output member are not co-axial, the pressing member is mounted on a bottom of the driving unit, and the output member is rotatably mounted in the driving unit and protrudes downwards; a first switch mounted inside the housing and electrically connected to the circuit board; a second switch mounted inside the housing, electrically connected to the circuit board, and spaced apart from the first switch by a gap; a resilient member mounted inside the housing, and pulling the driving unit for the pressing member of the driving unit to abut against the first switch; a transmission shaft mounted in the housing, having an actuation section formed on a top end of the transmission shaft, and having a non-circular section, wherein a bottom end of the transmission shaft protrudes downward beyond the housing; a clutch mounted inside the housing, connected between the driving unit and the transmission shaft, driven by the driving unit to rotate, and having:
a clutch stand non-relatively rotationally coupled to the output member of the driving unit, and sleeving the actuation section of the transmission shaft; anda resilient clip mounted inside the clutch stand, clipping the actuation section of the transmission shaft, and selectively opened by the actuation section; and a propeller mounted on the transmission shaft, and located outside the housing.