Cooling shaft structure for explosion-proof motor

Abstract

The invention relates to the field of motor cooling shafts, in particular to a cooling shaft structure for an underground coal mine explosion-proof motor. According to the cooling shaft structure for the explosion-proof motor, a shaft is divided into an outer shaft, an inner shaft and a shaft bar. Cooling media enter an inner shaft center hole from a medium opening A and flow into the front end of the inner shaft, after the cooling media penetrate through the inner shaft and reach the other end, the cooling media flow into the space formed by the inner shaft outer wall, the shaft bar and the outer shaft inner wall, finally, the cooling media flow out from a cooling medium opening in the outer shaft B, a circulating water channel is formed, the effect for cooling the explosion-proof motor is achieved, shaft cooling is accelerated, bearing damage is reduced, motor normal operation is guaranteed, according to the structure, a medium opening B can be used as a medium inlet, and the medium opening A is used as a medium outlet. The structure with the outer shaft, the inner shaft and the shaft bar combined together guarantees enough strength of the rotating shaft, and the fact that the cooling water channel can bear the working pressure required for explosive-proof performance is guaranteed.

Description

[0001] Technical field: [0002] The invention relates to the field of motor cooling shafts, in particular to a cooling shaft structure for underground explosion-proof motors in coal mines. [0003] Background technique: [0004] High-power explosion-proof motors must withstand a locked-rotor current that is several times the rated current and a locked-rotor torque that is several times the rated torque during operation. Burned, the equipment was forced to shut down, affecting production. [0005] The cooling shaft structure in the prior art, such as CN101924424B patent, the shaft is hollowed out with a steel pipe, and the space between the steel pipe and the shaft is supported by a support sleeve. There are holes in the support sleeve to allow water to pass through, but the support sleeve is perpendicular to the direction of water flow, making the water flow blocked. , the internal pressure becomes larger; the swivel joint guarantees the coaxiality of the shaft and the swivel...

AI Technical Summary

Problems solved by technology

[0004] High-power explosion-proof motors must withstand a locked-rotor current that is several times the rated current and a locked-rotor torque that is several times the rated torque during operation. Burned out, the equipment was forced to shut down, affecting production

[0005] The cooling shaft structure in the prior art, such as CN101924424B patent, the shaft is hollowed out with a steel pipe, and the space between the steel pipe and the shaft is supported by a support sleeve. There are holes in the support sleeve to allow water to pass through, but the support sleeve is perpendicular to the direction of water flow, making the water flow blocked. , the internal pressure becomes larger; the rotary joint guarantees the coaxiality between the shaft and the rotary joint through the bracket, and the installation is time-consuming and laborious, and the accuracy is not high

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