US 11,953,365 B2
Switching device and a liquid level detection apparatus employing the switching device
Erjian Song, Suzhou (CN); and Hanqin Zhou, Suzhou (CN)
Assigned to Chengli Li, Suzhou (CN)
Filed by Chengli Li, Suzhou (CN)
Filed on Oct. 27, 2021, as Appl. No. 17/512,414.
Claims priority of application No. 202111232665.1 (CN), filed on Oct. 22, 2021; and application No. 202122559404.2 (CN), filed on Oct. 22, 2021.
Prior Publication US 2023/0132194 A1, Apr. 27, 2023
Int. Cl. H01H 35/18 (2006.01); G01F 23/36 (2006.01); G01F 23/44 (2006.01)
CPC G01F 23/36 (2013.01) [G01F 23/44 (2013.01); H01H 35/18 (2013.01)] 13 Claims
OG exemplary drawing
 
1. A switching device, comprising:
a first enclosure, containing a switch;
a second enclosure, having a second end connected to the first enclosure, the second enclosure having a rod shape;
a detector unit, disposed in the second enclosure, including a first position sensor located at a first position, a second position sensor located at a second position, and detection circuit coupled to the first position sensor, the second position sensor and the switch; and
a float, disposed around an exterior of the second enclosure, and configured to move along the second enclosure;
wherein as the float moves from a first end of the second enclosure toward the second end of the second enclosure, when the float enters a first position range, the first position sensor is configured to sense the float and transmits a first sensing signal to the detection circuit; when the float enters a second position range, the second position sensor is configured to sense the float and transmits a second sensing signal to the detection circuit;
wherein the detection circuit is configured to close the switch in response to the second sensing signal;
wherein the first position range is a sensing range of the first position sensor, and the first position is within the first position range, and wherein the second position range is a sensing range of the second position sensor, and the second position is within the second position range.