Explosion prevention type terminal kit for cable coupling

Abstract

The invention relates to a terminal box used for connecting explosion proof type leading-out cables used for a large-scale motor. The terminal box comprises a junction box body and a cable sealing box, wherein three mutually closed terminal chambers are arranged in the junction box body, through holes are arranged on the rear walls and at the bottom parts of the terminal chambers, a sleeve pipe provided with a conducting rod and an end head and connected with a through hole on the rear wall of the junction box body in series is respectively arranged in the through hole on the rear wall of each terminal chamber to form a conducting rod channel, and pressure release discs are respectively arranged on the terminal chambers and the junction box body; the external cables are accessed from the cable sealing box and penetrate through the through holes at the bottom parts of the closed terminal chambers to be connected with the end head of the conducting rod on the sleeve pipe. Since the closed terminal chambers are arranged, the three-phase terminals are fully closed, and the insulating property is very reliable; meanwhile, even if the end head of the conducting rod is out of service and generates electric discharge, the generated heat causes the room pressure to rise, the pressure also can be released through the pressure release discs on the closed terminal chambers and the junction box body, so that the terminal box is prevented from exploding and various foreign substances are prevented from entering inside the motor, therefore, the safety of the motor is ensured.

Description

technical field [0001] The invention relates to an explosion-proof terminal box used for connection of lead-out cables for large motors. Background technique [0002] Most of the existing large-scale motor cable junction boxes in China use rectangular cabinets. There are three-phase busbars in the cable junction box of the rectangular cabinets. The two ends of the three-phase busbars are supported by two insulating terminals (the busbars are fixed on the insulating terminals). The three-phase cables of the motor are respectively led out to one end of the busbar in the junction box, and the other end of the busbar is correspondingly connected to the leadout cables. There is no isolation device between the terminals and the three-phase lead-out cables, and the phenomenon of air deterioration and moisture in the cable junction box is prone to occur, and the reliability of electrical insulation cannot be guaranteed. There have been several major accidents in China where the int...

AI Technical Summary

Problems solved by technology

There is no isolation device between the terminals and the three-phase lead-out cables, and the phenomenon of air deterioration and moisture in the cable junction box is easy to occur, and the reliability of electrical insulation cannot be guaranteed

There have been several major accidents in China where the interphase discharge caused by damp caused the terminal box to explode, causing foreign matter to enter the motor and short circuit to the ground, resulting in motor damage.

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