US 11,707,152 B2
Float valve motion detection device, pot cover assembly and pressure cooking appliance
Feng Peng, Foshan (CN); and Fan Zhang, Foshan (CN)
Appl. No. 16/483,741
Filed by FOSHAN SHUNDE MIDEA ELECTRICAL HEATING APPLIANCES MANUFACTURING CO., LIMITED, Foshan (CN)
PCT Filed Nov. 1, 2017, PCT No. PCT/CN2017/108986
§ 371(c)(1), (2) Date Aug. 5, 2019,
PCT Pub. No. WO2018/145491, PCT Pub. Date Aug. 16, 2018.
Claims priority of application No. 201720121908.7 (CN), filed on Feb. 10, 2017; and application No. 201720121912.3 (CN), filed on Feb. 10, 2017.
Prior Publication US 2020/0187698 A1, Jun. 18, 2020
Int. Cl. A47J 27/08 (2006.01); A47J 27/09 (2006.01); A47J 27/00 (2006.01); A47J 27/086 (2006.01); A47J 27/56 (2006.01)
CPC A47J 27/0802 (2013.01) [A47J 27/09 (2013.01); A47J 27/004 (2013.01); A47J 27/086 (2013.01); A47J 27/56 (2013.01)] 16 Claims
OG exemplary drawing
 
1. A float valve motion detection device for a pressure cooking appliance, comprising:
a float valve, a hollow inductance coil and a detection circuit, the float valve comprising a valve core made of non-magnetically conductive materials having permeability unequal to that of air, the valve core being movably mounted on an upper cover of the pressure cooking appliance, the valve core being pushed from a first position to a second position under pressure in a pot of the pressure cooking appliance; the detection circuit being electrically connected with the hollow inductance coil for detecting a change of inductance of the hollow inductance coil and determining position of the valve core in accordance with the change of the inductance; wherein
at the first position, the hollow inductance coil is partially located above the valve core;
the valve core comprises a first segment and a second segment below the first segment, and magnetic resistance of the first segment and that of the second segment are unequal;
a top surface of the first segment of the valve core is positioned in the hollow inductance coil when the valve core is not lifted by the pressure in the pot, a top surface of the second segment of the valve core is positioned in the hollow inductance coil only when the valve core is lifted by the pressure in the pot; and
volume of the valve core in the hollow inductance coil when it is at the first position is less than or greater than the volume of the valve core in the hollow inductance coil when it is at the second position.