Short-circuit discharge device for polypropylene film capacitor

Abstract

The invention belongs to the technical field of capacitance equipment, and relates to a short-circuit discharge device for a polypropylene film capacitor. The device comprises a bottom plate, whereinthe surface of the bottom plate is fixedly connected with a fixed bracket; an air cylinder is arranged on the fixed bracket; a vacuum arc-extinguishing chamber is fixedly arranged on the bottom platecorresponding to the end part of a piston rod of the air cylinder; the vacuum arc-extinguishing chamber is fixed on the bottom plate by a bracket arranged at the tail part of the vacuum arc-extinguishing chamber through a fifth fixing nut, a sixth fixing nut, a seventh fixing nut and corresponding screws; and an alternating current contactor is fixedly arranged on the bottom plate corresponding tothe outer end of the vacuum arc-extinguishing chamber. The discharge device upgrades the original short-circuit discharge device with low safety and vulnerability into a novel short-circuit dischargedevice which has high safety, high test precision, long service life, low cost and an elastic contact electrode for protecting the leading-out end of a capacitor from being crushed, so that productswith hidden dangers of "false connection" between a gold spraying layer and a thickened metal area of a polypropylene film in the polypropylene film capacitor are screened out, and the reliability ofthe long-term service life of the polypropylene film capacitor is ensured.

Description

technical field [0001] The invention belongs to the technical field of capacitor equipment, and relates to a short-circuit discharge device for polypropylene film capacitors. Background technique [0002] In recent years, with the economic development, the market has higher and higher requirements for product quality, which poses a great challenge to the stability of the quality of polypropylene film capacitors. [0003] The gold-spraying process is a key process in the production process of polypropylene film capacitors. The gold-spraying layer is connected to the thickened metal area on the polypropylene film surface of the capacitive element through gold-spraying metal particles. The leads on the capacitor end caps are connected, so the quality of the gold-sprayed layer directly determines the connection between the capacitive element and the capacitor leads, thus affecting the quality of the polypropylene film capacitor. If the contact state between the gold-sprayed lay...

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Problems solved by technology

The wire test is unsafe and difficult to measure, and the copper electrode is easy to catch fire, which is also unsafe, and the contact state is uncertain, easy to damage, and easy to crush the terminal of the capacitor, and the above two test methods are all carried out in the air, easy to catch fire Afterwards, the electrode is welded and corroded, resulting in uneven electrode surface. During the test, the contact resistance will fluctuate from time to time, which will also lead to unstable current during the test. Therefore, the above two test methods cannot meet the market requirements for short-circuit discharge detection of polypropylene film capacitors. increasing demand

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