Full membrane water cooling type intermediate frequency induction heating capacitor

Abstract

The invention discloses a whole film water-cooled medium-frequency induction heating capacitor, including a housing and a capacitor core, wherein, the housing is opened with a holding cavity, a plurality of capacitor cores are provided in the holding cavity, core leading-out terminals are provided on the capacitor cores, an isolation upper cover is fixed at the upper opening of the holding cavityof the housing, a leading-out terminal cooling water channel is provided adjacent to the core leading-out terminal in the holding cavity, both ends of the leading-out terminal cooling water channel and the outer end of the core leading-out terminal respectively extend outside the isolation upper cover, the holding cavity is also filled with cooling materials, the capacitor core includes a capacitor plate and a polypropylene film medium layer, the capacitor plate is an aluminum coating, the capacitor core is formed by coiling two-sided or one-sided inside sting of metallized film and at least one double-edge film coating layer, and the capacitor cores constitute a whole film non-symmetrical coiling structure. The induction heating capacitor ha a simple and reasonable structure, has changedthe traditional design of foil-type capacitor, and adopts a self-healing capacitor to substitute the non-self-healing capacitance, so that the induction heating capacitor has advantages of more convenient production, better product performance, more safety and reliability, low cost, and small size.

Description

technical field [0001] The invention relates to the technical field of capacitors, in particular to an intermediate-frequency, high-voltage, and large-current resonant capacitor used on induction heating equipment. Background technique [0002] In the medium frequency induction heating equipment, the capacitor used for resonance is mainly used in the frequency range of 1k-100kHz. The purpose is to improve the power factor and improve the circuit characteristics. Its main characteristics are large current and large reactive power; the effective current is between 500A- 2000A, reactive power 300KVar-2000KVar; their common characteristics are that they require high frequency, large current, large dv / dt, low loss, low inductance, and fast heat dissipation. [0003] Commonly used intermediate frequency induction heating capacitors, its structure includes a shell, heat transfer oil, capacitor core and its lead-out end, a lead-out cooling channel is installed in the shell near the ...

AI Technical Summary

Problems solved by technology

The induction heating capacitor, first of all, the capacitor core adopts a full-film structure, which replaces the aluminum foil structure that has been used in China for seven or eighty years. The higher the capacitance, the higher the withstand voltage, and it is safer and more reliable, thereby reducing the cost and volume; secondly, the capacitor core is composed of double-sided or single-sided inner series metallized film and at least one double-side thin-film coating. Reduce the loss and inductance of a single core, increase the overcurrent capacity, easily dissipate heat, and ensure sufficient withstand voltage of the product; moreover, because the capacitor core is all made of thin film, the heat setting effect of the core is improved, and the metallized film The plating layer is relatively thin, and it is not easy to leave gas in the series bridge in the core, thereby improving the withstand voltage and stability of the product; if the capacitor core is drawn out by connecting the lead-out end of the core in parallel, it can better solve the problem of high frequency of use and current Large, large dv / dt; Finally, the winding of the capacitor core adopts an asymmetric structure. According to the principle of physical magnetic field, the size of the overcurrent of the core at different positions is inconsistent, and the inside of the core adopts different structures. In this way, It satisfies the current distribution principle of the entire capacitor and makes the design of the capacitor more rational. Adopting such a structure can not only reduce the cost and volume of the capacitor, but also make the product more miniaturized, which is in line with the miniaturization of equipment development in the modern market. trend

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