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The cooling of submersible sewage pumps generally involves direct cooling of the motor casing through the fluid being pumped, as well as the use of cooling jackets. When the water pump operates below the liquid level, direct cooling is insufficient. There are two common methods for cooling with cooling jackets. One of these involves using wastewater as the cooling medium, but this can lead to blockages and sedimentation within the cooling channels, resulting in inadequate cooling of the motor, overheating of the motor, and even motor damage ； Another approach uses mechanical water as a cooling medium; although there are no issues such as blockages or scaling in the cooling water, there is heat-induced expansion of the mechanical water, which leads to the failure of the mechanical seal and water leakage that damages the motor. In response to the problems existing in products in this industry, Zhejiang Fengqiu Kruie Pump Co., Ltd. has invented a \"cooling device for submersible sewage pumps\" based on years of research, utilizing heat exchangers to effectively solve the cooling issue. On this basis, the \"internal circulation cooling submersible sewage pump\" was developed. The cooling system of this pump uses a special coolant with a high boiling point (up to 195°C) and a low freezing point (down to -40°C); it is soluble in water, non-toxic, odorless, and colorless, and does not cause secondary pollution. Within a dedicated circulation channel, this coolant circulates through impellers and heat exchangers to enable thorough heat exchange. The coolant has a fast circulation speed and high flow rate, resulting in an excellent heat dissipation effect. It effectively solves the cooling problem of water pumps operating in dry or semi-exposed conditions.