Analysis of four common cooling methods of submersible sewage pump and well pump

This kind of cooling method is mainly used in the dry type submersible sewage pump and the well used submersible electric pump. The inner cavity of the dry type electric motor is filled with air, and the heat dissipation of the end part of the stator winding and the rotor is mainly depended on the air inside the machine. Motor stator iron loss, stator slot winding through the casing surface water taken away. Heat generated by the rotor winding resistance loss and the rotor iron loss, part of the Qi gap directly to the stator iron core, a casing by transfer to motor wells away; another part of the spread of air, the heat and stator end winding pass to air the other a resistance heat loss and mechanical loss generated heat together, the machine air flow to the stator iron core, a casing and a bearing seat. Moreover, it is motor casing and bearing seat and other parts of the surface spread to motor wells away. Because of poor thermal conductivity, the heat capacity is very small, so the cooling condition of the stator winding and rotor winding of the well used in submersible motor is poor, and the temperature rise is relatively high.

The motor inside and outside the double water cooling cooling effect is good, therefore, the well water filled submersible sewage pump and submersible pump stator winding temperature rise is generally relatively low. Well with filling water type submersible sewage pumps and wells with submersible pump cavity filling water, stator core, stator winding, rotor iron core and the rotor winding, rotor bars and the rotor end ring) etc. are immersed in water, directly by the water cooling machine. The heat generated by the electric motor stator iron loss, the resistance loss of the stator slot winding and the partial resistance loss of the end winding is directly through the stator core, and is passed through the casing to the well water which flows through the casing surface. Heat generated by the rotor winding resistance loss and the rotor iron loss, part of the Qi gap directly to the stator, the stator pass to motor wells away; another part to pass on to the rotor cavity in the water, the heat and the stator end winding pass to the cavity is filled with water on a resistance heat loss and mechanical loss generated heat together, the cavity filling water transfer to the stator iron core, a casing and a bearing seat. Moreover, it is biography on the surface of the motor casing and bearing seat and other components to the wells away.

The heat generated by the electric motor stator iron loss, the resistance loss of the stator slot winding and the partial resistance loss of the end winding is directly through the stator core, and is passed through the casing to the well water which flows through the casing surface. Heat generated by the rotor winding resistance loss and the rotor iron loss, a part of Qi in the gap of oil directly to the stator and a casing by transfer to motor wells away; another part pass to rotor cavity filling Nur solution. This part of the heat and the stator end winding pass to the lumen fluid another part of the resistance heat loss and mechanical loss of heat, the cavity is filled with oil liquid pass to the stator iron core, a casing and a bearing seat. Moreover, it is the motor casing and bearing seat and other parts surface transfer to the motor wells away. Oil filling type deep well pump that uses this kind of cooling method. The internal organs of the oil filled motor are filled with insulating oil, and the stator core, stator winding, rotor iron core and rotor winding (rotor guide bar and rotor end ring) are immersed in oil.

The heat generated by the motor stator iron loss and the stator winding resistance loss is directly carried through the stator core or the cavity filling material, and is passed through the casing to the well water which flows through the casing surface. Heat generated by the rotor winding resistance loss and the rotor iron loss, a part through the air gap in the water and shielding sleeve directly to the stator, the stator pass to the motor wells away: another part to the rotor cavity filled with water, heat generated by the heat and mechanical loss together, the cavity filling water pass to the stator iron core, a casing and a bearing seat, finally through the surface of the motor casing and bearing seat and other parts specifically for motor wells away. The main use of this type of cooling is the well shielded submersible motor. The stator of the motor is an independent sealed cavity, and the stator core and the winding package are sealed up, filled with epoxy resin or plastic filler, and the rotor cavity is filled with water.