▎ 摘　　要

NOVELTY - Capacitor comprises electric core located in shell. The sealing device is located at opening of shell. The sealing device is connected with electric core. The sealing device is provided with pole. The periphery of pole is orderly sleeved with metal ring and insulating portion from top to bottom. The outer circumferential surface of pole is provided with first annular engaging surface. The inner circumferential surface of metal ring is provided with second annular engagement surface. The insulating portion is formed with groove that is provided with cover plate. USE - The capacitor is used for industrial Internet of Things. ADVANTAGE - The capacitor has better sealing property, and satisfies requirement of industrial internet-of-things to a power supply. DETAILED DESCRIPTION - An INDEPENDENT CLAIM is included for preparation of capacitor. DESCRIPTION OF DRAWING(S) - The drawing shows a schematic structure diagram of capacitor.