An explosion-proof film capacitor which prevents electric breakdown between pole shells

Abstract

An explosion-proof film capacitor which prevents electric breakdown between pole shells comprises an aluminum case (10), an explosion-proof cover plate assembly (40) and a capacitor body arranged in the aluminum case (10). The capacitor body comprises a lower positioning sleeve (20), an upper positioning cover (30) and a capacitor core (2) wound on a core rod (1) arranged between the lower positioning sleeve (20) and the upper positioning cover (30); The capacitor core (2), the lower positioning sleeve (20) and the upper positioning cover (30) are poured with an impregnating agent (3). The invention can improve the eligibility rate of the electrode shell withstand voltage and remarkably reduce the manufacturing cost of the capacitor.

Description

technical field [0001] The invention relates to the manufacturing technology of film capacitors, in particular to an explosion-proof film capacitor which prevents electric breakdown between pole shells. Background technique [0002] The existing CBB65 film capacitor generally includes an aluminum shell and an explosion-proof cover plate assembly. Upper and lower positioning sleeves are installed in the aluminum shell. The core of the film capacitor is arranged between the upper and lower positioning sleeves. The lead-out wire on the core of the film capacitor passes through the upper positioning sleeve and is electrically connected to the metal sheet at the bottom of the explosion-proof block. The impregnating agent is filled between the positioning sleeve and the aluminum shell, and the upper and lower positioning sleeves and the impregnating agent act as the core. Insulation and positioning between the aluminum shell; after the coiled semi-finished film capacitor core is s...

AI Technical Summary

Problems solved by technology

[0002] The existing CBB65 film capacitor generally includes an aluminum shell and an explosion-proof cover plate assembly. Upper and lower positioning sleeves are installed in the aluminum shell. The core of the film capacitor is arranged between the upper and lower positioning sleeves. The lead-out wire on the core of the film capacitor passes through the upper positioning sleeve and is electrically connected to the metal sheet at the bottom of the explosion-proof block. The impregnating agent is filled between the positioning sleeve and the aluminum shell, and the upper and lower positioning sleeves and the impregnating agent act as the core. Insulation and positioning between the aluminum shell; after the coiled semi-finished film capacitor core is sprayed with gold, the two ends of the core form a certain thickness of gold sprayed layer, which is used in core assembly, sealing processing and other processes During the process, the metal particles on the gold-sprayed layer are prone to fall off due to the vibration generated by external force. These fallen metal particles are infiltrated in the impregnating agent, resulting in electrical breakdown between the lead-out electrode of the core and its shell. During the factory test The pressure resistance of the middle pole shell is unqualified

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