Explosion-proof three-phase asynchronous motor suitable for mine working conditions

Abstract

The invention discloses an explosion-proof three-phase asynchronous motor suitable for mine working conditions. The motor comprises a main shaft assembly, a rotor, a stator, a shell, a front end coverand a tail end cover, wherein a front cover bearing is arranged at the position where the main shaft assembly penetrates through the front end cover, a junction box is arranged on an outer surface ofthe shell, an external power supply is connected into a motor through a power line, a sealing gasket is arranged on a contact surface of the front end cover and the shell, a rotating shaft seal is arranged in the center of the front end cover and on one side, facing the outside, of the front cover bearing, positive-pressure safety gas is introduced into the shell, a through hole is formed on thewall shell of the machine shell, the through hole is connected with the interior of the machine shell and the space in the junction box, and the positive pressure safety gas introduced into the machine shell is introduced through a power line. The power line comprises a cable and an air pipe, a binding post is arranged in the junction box and connected with the stator, the cable is connected withthe binding post, the air pipe extends into the junction box, and one end, away from the junction box, of the air pipe blows the air on the ground surface through an external draught fan.

Description

technical field [0001] The invention relates to the field of motors, in particular to an explosion-proof three-phase asynchronous motor suitable for mine working conditions. Background technique [0002] Electrical appliances in mines have very high safety requirements, and motors used in mines must be explosion-proof. [0003] In the prior art, explosion protection is mostly carried out by means of flameproofing, that is, even if an explosion occurs at some high-temperature points, as long as the explosion does not spread, the explosion of the ambient gas around the motor will not be caused by the explosion at a small point. Explosion, then it is called explosion-proof. [0004] However, the components of the gas in the mine are always under the characteristics of being explosive. As long as the third factor of the explosion-the temperature reaches the explosion point, it will cause an explosion. The sealing additional structure is very bulky, which greatly increases the ...

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Problems solved by technology

[0004] However, the components of the gas in the mine are always under the characteristics of being explosive. As long as the third factor of the explosion-the temperature reaches the explosion point, it will cause an explosion. The sealing additional structure is very bulky, which greatly increases the complexity and manufacturing cost of the motor, and greatly increases the weight

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