Learn - Aug. 26, 2020
3. Oil cooling inside the machine and cooling water outside the equipment
QY oil-filled submersible sewage pumps use this type of refrigeration method. The internal organs of the oil-filled motor are filled with insulating grease. Its motor stator core, motor stator winding, motor rotor core and rotor winding (motor rotor guide bar and rotor end ring), and other components are all immersed in oil in. The heat generated by the stator iron loss of the motor, the resistance loss of the stator slot winding of the motor, and a part of the resistance loss of the top winding is immediately sent to the river water flowing through the surface of the casing according to the stator core of the motor. Part of the heat generated by the resistance loss of the motor rotor winding and the loss of the rotor iron is sent to the motor stator immediately through the hydraulic oil in the magnetic density, and sent to the river outside the motor through the shell; the other part is sent to the motor rotor cavity In the filled liquid, this part of the heat is sent to the motor through the hydraulic oil filled in the inner wall together with the other part of the resistance loss heat generated by the winding of the motor stator to the inner wall hydraulic oil and the heat generated by the loss of mechanical equipment. The stator-transformer core, housing, and bearing with seats are finally sent to the river outside the motor according to the surface of the motor shell and bearing with seat.
4. Method of evaporative cooling inside the machine and cooling water outside the equipment
The main choice of this type of refrigeration method is the dry test submersible sewage pump used in the well. The inner wall of the dry test motor is filled with gas, and the key to the heat removal of the stator winding top and the rotor of the motor is the gas of the body. The iron loss of the motor stator and the winding resistance of the motor stator slot is carried by the river water on the surface of the shell. Part of the heat generated by the resistance loss of the motor rotor winding and the rotor iron loss is immediately sent to the motor stator transformer core through the magnetic density, and sent to the river outside the motor through the shell; the other part is transferred into the air of the machine, This part of the heat and the other part of the resistance loss heat sent to the gas by the winding at the top of the motor stator and the heat caused by the loss of mechanical equipment is sent to the motor stator transformer core, housing and belt through the fluid gas in the machine. The housing bearing is finally sent to the river outside the motor according to the surface layer of the motor housing and the housing bearing. Due to the poor heat transfer and thermal conductivity of the gas, the cooling standard deviation of the stator winding and the rotor winding of the well-used submersible motor is relatively high.
The information is provided by the sewage pump manufacturer.
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