Explosion-proof dust sealing device for explosion-proof motor

Abstract

The invention discloses an explosion-proof dust sealing device for an explosion-proof motor. The bottom of the sealing device is an explosion-proof surface; the explosion-proof surface comprises motor shaft explosion-proof surface at the inner end and an outer cover explosion-proof surface at the outer end; a platform surface perpendicular to a motor shaft is arranged at the outermost end of the explosion-proof surface; a Teflon sealing ring is arranged on the platform surface, and comprises a sealing bottom ring close to the platform surface and a sealing lip for sealing the motor shaft; the sealing bottom ring is locked on the platform surface through a locking friction plate; a part outwards extending from the platform surface is a fixed ring in which three assembly holes are formed; during mounting, the bottom of the fixed ring is close to the outer end face of an outer cover of the motor; matched assembly holes are formed in the outer end face of the outer cover of the motor; an axial plane oil seal is also fixedly arranged on the motor shaft; a lip of the axial plane oil seal is sealed with the outer end face of the locking friction plate in an interference fit way. According to the explosion-proof dust sealing device, with the adoption of the inner and outer explosion-proof surfaces and the double-layer sealing design of the axial seal and the end face seal, the dustproof efficiency and safety of the whole protective sealing device are improved, and the service life of the whole protective sealing device is prolonged.

Description

technical field [0001] This product relates to a motor sealing protection mechanism, in particular to an outer cover sealing device of an explosion-proof motor used in an environment of combustible dust. Background technique [0002] After the "8.2 Kunshan Dust Explosion Accident", the state has paid more attention to the requirements for safe production, and the protection level of dustproof and waterproof requirements for explosion-proof motors has been raised from IP54 to IP65. [0003] The dust-proof sealing mechanism used in the existing explosion-proof motor is a rubber dust-proof sealing ring, which is fixed on the motor shaft, and the lip is closely attached to the outer cover of the motor to play the role of plane seal. The disadvantage is that the highest protection level is IP54, and after long-term use, rubber aging will reduce the interference between the rubber dust-proof seal ring and the motor shaft. [0004] The other is to use the traditional skeleton oil ...

AI Technical Summary

Problems solved by technology

At the same time, it will cause mechanical loss to the motor, which is extremely unfavorable to energy saving and high efficiency.

High temperature and high mechanical loss are more likely to wear the skeleton sealing lip, accelerate the failure of waterproof and dustproof, and reduce the service life

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