A shielded motor stator cavity cooling structure

Abstract

The invention discloses a cooling structure for a stator cavity of a shielded motor, which comprises a cooling water pipe (1) arranged in a closed cavity at both ends of a stator core (4) of the shielded motor, and the cooling water pipe (1) is connected with the stator barrel of the shielded motor The cooling water jacket on the outer wall is connected. The invention can effectively take out the heat accumulated in the airtight cavities at both ends of the motor stator, improve the temperature distribution of the inner cavity of the motor stator, and can also use the motor stator cooling water clamp under the condition of power failure, pump shutdown or secondary cooling water loss. The temperature difference between the sleeve and the inner cavity of the stator produces a natural circulation of the fluid, thereby taking away part of the heat in the inner cavity of the stator, avoiding the failure of the shielded motor due to the temperature of the inner cavity of the motor stator exceeding the allowable temperature of the insulation, and improving the reliability of the stator winding coil of the shielded motor To ensure the safe and stable operation of nuclear energy installations.

Description

technical field [0001] The invention relates to the technical field of shielded motors, in particular to a cooling structure for a stator cavity of a shielded motor. Background technique [0002] In the field of nuclear energy technology, the high-temperature and high-pressure fully-sealed canned pump of the nuclear energy device adopts a fully-sealed structure to withstand the high-temperature and high-pressure primary circuit medium, and its motor part and hydraulic components are connected as a whole. in the liquid inside. [0003] In order to avoid motor failure caused by the stator core and winding coils of the motor being in contact with the reactor coolant liquid, the thin-walled stainless steel shielding sleeve 6 is mainly installed into the inner wall of the motor stator core 4, and the two ends of the shielding sleeve 6 are sealed and welded. means to achieve hermetic isolation. However, after adopting such a closed structure of the stator cavity, it is unfavorab...

AI Technical Summary

Problems solved by technology

However, after adopting such a closed structure of the stator cavity, it is unfavorable for the heat dissipation of the motor stator. Therefore, in order to cool the motor stator cavity that is closed and has a poor heat dissipation effect, a jacket layer is usually set on the outer wall of the motor stator cylinder, and Use secondary cooling water to transfer heat through the outer wall of the motor stator cylinder to remove heat from the inner cavity of the stator for cooling

[0004] However, the heat dissipation effect of this method of secondary cooling water cooling on the outer wall of the motor cylinder is not ideal, because the heat transfer effect of the air in the cavity at the two ends of the stator inner cavity is relatively poor, resulting in the inner cavity at the two ends of the motor stator. The winding coil is in a relatively high temperature environment, especially in the case of power failure, pump shutdown and secondary cooling water loss, the heat sealed in the inner cavity of the motor stator cannot be exported, which may easily cause the temperature of the inner cavity of the motor stator to exceed the allowable insulation temperature, eventually causing the shielded motor to fail

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