CN214203466U

CN214203466U - Compact low-inductance metallized film dry capacitor for pulse equipment

Info

Publication number: CN214203466U
Application number: CN202022822330.2U
Authority: CN
Inventors: 张炳生; 孙勇
Original assignee: YANGZHOU XINYUAN ELECTRIC CO Ltd
Current assignee: YANGZHOU XINYUAN ELECTRIC CO Ltd
Priority date: 2020-11-30
Filing date: 2020-11-30
Publication date: 2021-09-14
Anticipated expiration: 2030-11-30

Abstract

The utility model relates to a pulse is low inductance metallized film dry-type capacitor of compact for equipment. The capacitor comprises an insulating shell, a series-parallel connection copper strip, epoxy resin glue and a plurality of elements; the elements are arranged in the insulating shell one by one, so the elements are connected in series and parallel through a series-parallel connection copper strip, the epoxy resin glue is filled in the insulating shell, and the elements are packaged and fixed; the element comprises an insulating medium, a metal membrane electrode and an element extraction electrode; the metal membrane electrode is plated on two sides of an insulating medium in an electroplating mode, the insulating medium is wound into independent cylinders through a winding machine, two electrodes are formed on two end faces of each cylinder, and metal layers are sprayed on the two end faces to be led out to form element leading-out electrodes.

Description

Compact low-inductance metallized film dry capacitor for pulse equipment

Technical Field

The utility model relates to a be used for impulse voltage and impulse current equipment, especially relate to a pulse is compact low inductance metallized film dry-type capacitor for equipment.

Background

The capacitor, generally referred to as capacitor, is a capacitor for holding electric charge, and as the name suggests, the capacitor is a capacitor for holding electric charge, and is a device for holding electric charge, the capacitor is one of electronic components used in a large number of electronic devices, and is widely applied to aspects of blocking direct current and alternating current, coupling, bypassing, filtering, tuning loop, energy conversion, control and the like in a circuit, the capacitor, any two conductors which are insulated from each other and closely spaced, form a capacitor, and at present, the capacitor has the disadvantages of roughly large volume and large loop inductance; oil leakage of the oil-immersed capacitor; the self-healing property is poor.

Disclosure of Invention

An object of the utility model is to provide a pulse equipment is with low inductance metallized film dry-type capacitor of compact to solve the problem among the prior art.

The technical scheme of the utility model is that: a compact low-inductance metallized film dry capacitor for pulse equipment comprises an insulating shell, a series-parallel connection copper strip, epoxy resin glue and a plurality of elements;

the elements are arranged in the insulating shell one by one, so the elements are connected in series and parallel through a series-parallel connection copper strip, the epoxy resin glue is filled in the insulating shell, and the elements are packaged and fixed;

the element comprises an insulating medium, a metal membrane electrode and an element extraction electrode;

the metal membrane electrode is plated on two sides of an insulating medium in an electroplating mode, the insulating medium is wound into independent cylinders through a winding machine, two electrodes are formed on two end faces of each cylinder, and metal layers are sprayed on the two end faces to be led out to form element leading-out electrodes.

Furthermore, the insulating medium is a polypropylene optical film, and the thickness of the film is 5-16 μm.

Furthermore, the metal film electrode is a layer of metal powder layer plated on the surface of the insulating medium, and the thickness of the metal powder layer is 0.1 μm.

Furthermore, the series-parallel connection copper strips are made of beryllium bronze.

Furthermore, the insulating housing is formed by die casting of SMC materials.

Furthermore, the plurality of elements are arranged in a square or rectangular shape at equal intervals.

Furthermore, the series-parallel connection copper strips are straight strips, and the width of the series-parallel connection copper strips is 1/3-2/3 of the diameter of the end face of the element.

The utility model has the advantages that: the insulation medium is made of a polypropylene optical film insulation material with the thickness of about 5-16 mu m, the film has self-healing property, when voltage is applied, the electric weak point of the metallized polypropylene film or the metallized paper is punctured, the puncture current passes through the puncture point, and the current density of the conductive metallized coating is sharply increased, so that the metallized layer generates high heat, the metal coating around the puncture point is rapidly evaporated and dissipated to form a metal coating blank area, and the puncture point automatically recovers insulation. The dielectric film creates a very small hole, on the order of a few microns in diameter, and the area of the metallized coating that disappears during the self-healing process is on the order of a few millimeters in diameter, thereby reducing the capacitance of the capacitor rather than a direct short. The capacity of the capacitor is gradually reduced along with the increase of the self-healing times, and the electric weakness of the capacitor is eliminated.

Drawings

Fig. 1 is a schematic structural diagram of the present invention.

Fig. 2 is a schematic view of the structure of the element.

Fig. 3 is a side view schematic of fig. 2.

In the figure, 1 is an insulating medium, 2 is a metal membrane electrode, 3 is an element leading-out electrode, 4 is an insulating shell, 5 is a series-parallel connection copper strip, and 6 is epoxy resin glue.

Detailed Description

A compact low-inductance metallized film dry capacitor for pulse equipment comprises an insulating shell 4, a series-parallel connection copper strip 5, an epoxy resin adhesive 6 and a plurality of elements;

the elements are arranged in the insulating shell 4 one by one, so the elements are connected in series and parallel through the series-parallel connection copper strips 5, the epoxy resin glue 6 is filled in the insulating shell 4, and the elements are packaged and fixed;

the element comprises an insulating medium 1, a metal membrane electrode 2 and an element extraction electrode 3;

the metal membrane electrode 2 is plated on two sides of the insulating medium 1 in an electroplating mode, the insulating medium 1 is wound into independent cylinders through a winding machine, two electrodes are formed on two end faces of each cylinder, and metal layers are sprayed on the two end faces to be led out to form element leading-out electrodes 3.

The insulating medium 1 is a polypropylene optical film, the thickness of the film is 5-16 mu m, the film has self-healing property, when voltage is applied, the electric weak point of the metallized polypropylene film or the metallized paper is punctured, the puncture current passes through the puncture point, and the current density of the conductive metallized coating is sharply increased, so that the metallized layer generates high heat, the metal coating around the puncture point is rapidly evaporated and dissipated to form a metal coating blank area, and the puncture point automatically recovers insulation. The dielectric film creates a very small hole, on the order of a few microns in diameter, and the area of the metallized coating that disappears during the self-healing process is on the order of a few millimeters in diameter, thereby reducing the capacitance of the capacitor rather than a direct short. The capacity of the capacitor is gradually reduced along with the increase of the self-healing times, and the electric weakness of the capacitor is eliminated;

the metal membrane electrode 2 is a layer of metal powder layer plated on the surface of the insulating medium 1, and the thickness of the metal powder layer is 0.1 mu m.

The series-parallel connection copper strip 5 is made of beryllium bronze, a plurality of original pieces are connected in series-parallel, the inductance of the whole capacitor is greatly reduced by connecting a plurality of original pieces in parallel, and the voltage is smaller by adopting a wide copper strip;

the insulating shell 4 is formed by die-casting an SMC material, is formed by die-casting a die-casting die, is formed in one step, and has a stable mechanical structure and high insulating property;

the plurality of elements are arranged in a square or rectangular shape at equal intervals.

The series-parallel connection copper strips 5 are straight strips, and the width of the series-parallel connection copper strips is 1/3-2/3 of the diameter of the end face of the element.

The higher the voltage applied to the two ends of the epoxy resin adhesive 6 is, the larger the electric field force applied to the charge in the material is, and the more easily the ionization collision occurs, so that the adhesive breakdown is caused. The lowest voltage at which an insulator breaks down is called the breakdown voltage of the object. When an insulating material with a thickness of 1 mm is broken down, the applied voltage kilovolts is called the dielectric breakdown strength of the insulating material

In the description of the present invention, it should be understood that the indicated orientation or positional relationship is based on the orientation or positional relationship shown in the drawings, and is only for convenience of description and simplification of description, and does not indicate or imply that the indicated device or element must have a particular orientation, be constructed and operated in a particular orientation, and thus should not be construed as limiting the present invention.

In the present invention, unless otherwise explicitly specified or limited, for example, it may be fixedly connected, detachably connected, or integrated; can be mechanically or electrically connected; they may be directly connected or indirectly connected through an intermediate medium, and may be connected through the inside of two elements or in an interaction relationship between two elements, unless otherwise specifically defined, and the specific meaning of the above terms in the present invention will be understood by those skilled in the art according to specific situations.

Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.

Claims

1. The utility model provides a pulse is compact low inductance metallized film dry-type capacitor for equipment which characterized in that: the capacitor comprises an insulating shell (4), a series-parallel connection copper strip (5), an epoxy resin adhesive (6) and a plurality of elements;

the elements are arranged in the insulating shell (4) one by one, so the elements are connected in series and parallel through a series-parallel connection copper strip (5), the epoxy resin glue (6) is filled in the insulating shell (4) to encapsulate and fix the elements;

the element comprises an insulating medium (1), a metal membrane electrode (2) and an element extraction electrode (3);

the metal membrane electrode (2) is plated on two sides of the insulating medium (1) in an electroplating mode, the insulating medium (1) is wound into independent cylinders through a winding machine, two electrodes are formed on two end faces of each cylinder, metal layers are sprayed on the two end faces to be led out, and an element leading-out electrode (3) is formed.

2. A compact low inductance metallized film dry capacitor for pulse devices as claimed in claim 1, wherein: the insulating medium (1) is a polypropylene optical film, and the thickness of the film is 5-16 mu m.

3. A compact low inductance metallized film dry capacitor for pulse devices as claimed in claim 1, wherein: the metal membrane electrode (2) is a layer of metal powder layer plated on the surface of the insulating medium (1), and the thickness of the metal powder layer is 0.1 mu m.

4. A compact low inductance metallized film dry capacitor for pulse devices as claimed in claim 1, wherein: the series-parallel connection copper strip (5) is made of beryllium bronze.

5. A compact low inductance metallized film dry capacitor for pulse devices as claimed in claim 1, wherein: the insulating shell (4) is formed by SMC material through die casting.

6. A compact low inductance metallized film dry capacitor for pulse devices as claimed in claim 1, wherein: the plurality of elements are arranged in a square or rectangular shape at equal intervals.

7. The compact low inductance metallized film dry capacitor for pulse devices as claimed in claim 4, wherein: the series-parallel connection copper strips (5) are straight strips, and the width of the series-parallel connection copper strips is 1/3-2/3 of the diameter of the end face of the element.