Coolant pumping device

Abstract

A coolant pumping device includes a casing containing a stator portion of an electrical motor, including windings and silicon steel plates, and a control circuit board. A first chamber is formed atop the casing in which a blade assembly is rotatably received for effecting circulation of a coolant. A second chamber delimited by a cylindrical wall fixed inside the casing rotatably receives a rotor magnet, which is driven by the stator portion. The blade assembly is fixed to the rotor magnet. Slots are defined in the casing for retaining the control circuit board. A Hall IC, serving as a sensing element for detecting polarity of the magnet inside the second chamber is electrically connected to the circuit board and is fixed inside the casing. The sensing element provides a detection signal to the control circuit board to enhance operation smoothness of the pumping device.

1 . A pumping device comprising: 
 a casing member encasing windings and silicon steel plates, a circuit board being arranged in the casing for controlling supply of power;    a first chamber formed atop the casing and delimited by an outer wall from which an outlet is formed, the outlet being in fluid communication with the first chamber, a lid removably closing a top opening of the first chamber and forming an inlet in fluid communication with the first chamber;    a second chamber delimited by an outer wall arranged inside the casing, the second chamber being in fluid communication with the first chamber;    a magnet rotatably received in the second chamber;    a blade assembly fixed to and rotatable in unison with the magnet, the blade assembly being rotatably positioned in the first chamber for driving a fluid that enters the first chamber from the inlet and that is discharged through the outlet;    at least one circuit board retention slot formed on an inside surface of a wall of the casing to receive and retain the circuit board inside the casing; and    a sensing element in electrical connection with the circuit board, the sensing element being received and retained in a sensing element retention slot formed on an outside surface of the wall of the second chamber to correspond in position to the magnet received in the second chamber.    
   
   
       2 . The pumping device as claimed in  claim 1 , wherein the sensing element comprises a Hall IC.