KR102567655B1 - Vacuum capacitor and Method for manufacturing the same - Google Patents

Abstract

The present invention relates to a vacuum capacitor and a method for manufacturing the vacuum capacitor.
An object of the present invention is to provide a vacuum capacitor and a vacuum capacitor manufacturing method capable of improving assemblyability and reducing manufacturing cost.
A vacuum capacitor according to a preferred embodiment of the present invention includes a fixed cup; a protrusion protruding from the center of the fixing cup; a caulking portion extending in the lateral direction of the protrusion and formed at a height lower than that of the protrusion; and a plurality of electrodes fixed by the caulking part.
The present invention can omit the brazing process for fixing each of the plurality of electrodes by fixing the plurality of electrodes with the caulking portion.

Description

Vacuum capacitor and method for manufacturing the vacuum capacitor {Vacuum capacitor and Method for manufacturing the same}

The present invention relates to a vacuum capacitor and a method for manufacturing the vacuum capacitor.

A vacuum capacitor preferably consists of a vacuum-tight enclosure and a capacitance generating arrangement of conductive surfaces (electrodes) within the vacuum enclosure. The internal volume is pumped down to a very low pressure (preferably below 10 −6 mbar) and is kept low throughout the lifetime of the device by the vacuum seal. The vacuum ensures that the electrodes are well electrically insulated and the dielectric losses of the device are very low.

In the vacuum capacitor, the capacitance of the capacitor may be varied by varying the area where the cathode and anode are charged. Such a vacuum capacitor is referred to as a variable capacity vacuum capacitor.

1. Korean Patent Application No. 10-2001-0012821 (Application Date: 2001.03.13) 2. Korean Patent Application No. 10-2014-7021842 (Application Date: 2012.02.03)

An object of the present invention is to provide a vacuum capacitor and a method for manufacturing the vacuum capacitor, which can improve assembly quality and reduce manufacturing cost.

A vacuum capacitor according to a preferred embodiment of the present invention includes a fixed cup; a protrusion protruding from the center of the fixing cup; a caulking portion extending in the lateral direction of the protrusion and formed at a height lower than that of the protrusion; and a plurality of electrodes fixed by the caulking part.

Here, the plurality of electrodes include a horizontal portion, a vertical portion and a fixing hole, and the plurality of electrodes may be fitted into the caulking portion using the fixing hole.

Also, the fixing holes of the plurality of electrodes may have a circular shape, and the fixing holes of the plurality of electrodes may have the same radius.

In addition, while the caulking part is caulked, the plurality of electrodes may be fixed on the fixing cup by pressing the horizontal part of the innermost electrode.

A vacuum capacitor manufacturing method according to a preferred embodiment of the present invention includes an electrode assembly assembly process in which a plurality of electrodes are stacked while being inserted into a caulking portion using a fixing hole; and a caulking step of fixing the plurality of electrodes on the fixing cup by applying pressure to an upper part of the caulking part and pressing a horizontal part of an innermost electrode among the plurality of electrodes.

The present invention can omit the brazing process for fixing each of the plurality of electrodes by fixing the plurality of electrodes with the caulking portion.

In the present invention, since a plurality of electrodes are centered by the caulking part, a separate structure for centering may not be required.

Due to the above effect, the present invention can improve the assemblability of the vacuum interrupter and reduce the manufacturing cost.

1 is a cross-sectional view of a vacuum capacitor according to a preferred embodiment of the present invention.
2A and 2B are views for explaining an assembly process of an electrode assembly.
3 is a cross-sectional view of an electrode assembly after an assembly process of the electrode assembly has been completed.
4 is an exploded perspective view of the electrode assembly of FIG. 3;
5A to 5C are diagrams for explaining the caulking process.

Since the present invention can make various changes and have various embodiments, specific embodiments will be illustrated in the drawings and described in detail in the detailed description. However, this is not intended to limit the present invention to specific embodiments, and should be understood to include all modifications, equivalents, or substitutes included in the spirit and technical scope of the present invention.

Like reference numerals have been used for like elements throughout the description of each figure. In describing the present invention, if it is determined that a detailed description of related known technologies may obscure the gist of the present invention, the detailed description will be omitted.

Terms such as first and second may be used to describe various components, but the components should not be limited by the terms. These terms are only used for the purpose of distinguishing one component from another.

For example, a first element may be termed a second element, and similarly, a second element may be termed a first element, without departing from the scope of the present invention.

The terms and/or include any combination of a plurality of related recited items or any of a plurality of related recited items.

Terms used in this application are only used to describe specific embodiments, and are not intended to limit the present invention.

Singular expressions include plural expressions unless the context clearly dictates otherwise. In this application, the terms "include" or "have" are intended to designate that there is a feature, number, step, operation, component, part, or combination thereof described in the specification, but one or more other features It should be understood that the presence or addition of numbers, steps, operations, components, parts, or combinations thereof is not precluded.

Unless defined otherwise, all terms used herein, including technical or scientific terms, have the same meaning as commonly understood by one of ordinary skill in the art to which the present invention belongs.

Terms such as those defined in commonly used dictionaries should be interpreted as having a meaning consistent with the meaning in the context of the related art, and unless explicitly defined in this application, it should not be interpreted in an ideal or excessively formal meaning. don't

Hereinafter, a vacuum capacitor according to a preferred embodiment of the present invention will be described with reference to FIG. 2 . In order to clarify the gist of the present invention, descriptions of conventionally known matters are omitted or simplified.

Referring to FIG. 1 , the vacuum capacitor may include a body 10, a fixed conductor 200, and a movable flange 300.

The main body 10 may be a hollow cylinder open on both sides. The body 10 may be formed of an insulating material (eg, ceramic).

The stationary conductor 200 may be formed in the shape of a cylindrical cup with an open bottom. The lower surface of the fixed conductor 200 may be adhered to and fixed to the upper surface of the main body 10 . The first electrode assembly 210 may be fixed to the inner lower surface of the fixed conductor 200 . The first electrode assembly 210 may be opened downward. The first electrode assembly 210 may include a first fixing cap 211 , a plurality of first electrodes 212 , a first protrusion 213 , and a first caulking portion 214 . The first fixing cap 211 may have a cup shape with an open bottom. The plurality of first electrodes 212 may have a cylindrical shape. The radii of the plurality of first electrodes 212 may be different from each other. Side surfaces of the plurality of first electrodes 212 may be spaced apart from each other while going in a lateral direction based on the first caulking part 214 . A radius of the plurality of first electrodes 212 may increase toward the outside from the first caulking portion 214 . The plurality of first electrodes 212 may face each other between the plurality of second electrodes 312 . The plurality of first electrodes 212 may be fixed on the first fixing cap 211 by the first caulking part 214 . The first protruding portion 213 and the first caulking portion 214 may have a cylindrical shape. The first protrusion 213 may be formed to protrude downward from the center of the lower inner surface of the first fixing cap 211 . The first caulking portion 214 may have a shape in which an upper region of the first protrusion 213 extends laterally. The first caulking portion 214 may be formed at a height lower than that of the first protruding portion 213 . The end of the first caulking portion 214 may have a caulked area in a lateral direction.

A detailed structure of the first electrode assembly 210 will be described later with reference to FIG. 5C.

The movable flange 300 may be formed in a cylindrical cup shape with an open top. The upper surface of the movable flange 300 may be fixed to the lower surface of the main body 10 in close contact. The central region of the movable flange 300 may be perforated vertically. The perforated area of the movable flange 300 may be circular.

The movable conductor guide 301 may extend directly upward from the edge of the perforated area of the movable flange 300 . The movable conductor guide 310 may have a hollow cylindrical shape.

The movable conductor 302 may be located inside the movable conductor guide 301 . The movable conductor 302 may be cylindrical. The movable conductor 302 can move up and down while being guided by the movable conductor guide 301 .

Cap 303 may seal the perforated central region of movable flange 300 . The cap 303 may have a space capable of accommodating the lower part of the movable conductor 302 in the inner space. The movable conductor 302 can freely move up and down within the cab 303 by a predetermined interval.

The shaft 304 may be installed through a lower portion of the cap 303 . The shaft 304 can move up and down when guided by the bearing 305 provided inside the cap 303. The shaft 304 is connected to a driving means (not shown) and can move up and down by the driving force of the driving means. The top of the shaft 304 may be fixed inside the movable conductor 302 . Thereby, the movable conductor 302 can move up and down together with the shaft 304.

The movable electrode plate 306 may be provided on top of the movable conductor 302 . The movable electrode plate 306 may be formed in a disk shape extending from an upper end of the movable conductor 302 to an outer circumferential surface of the movable conductor 302 . The second electrode assembly 310 may be fixed to the top of the movable electrode plate 306 . The second electrode assembly 310 may be opened upward. The second electrode assembly 310 may include a second fixing cap 311 , a plurality of second electrodes 312 , a second protrusion 313 , and a second caulking part 314 . The second fixing cap 311 may have a cup shape with an open top. The plurality of second electrodes 312 may have a cylindrical shape. The radii of the plurality of second electrodes 312 may be different from each other. Side surfaces of the plurality of second electrodes 312 may be spaced apart from each other while going in a lateral direction based on the second caulking part 314 . The radii of the plurality of second electrodes 312 may increase toward the outside from the second caulking portion 314 . The plurality of second electrodes 312 may face each other between the plurality of first electrodes 212 . In this structure, the capacitance of the vacuum capacitor can be varied by adjusting the area where the first electrode 212 and the second electrode 312 face each other while moving the second electrode 312 up and down. The plurality of second electrodes 312 may be fixed on the second fixing cap 311 by the second caulking part 314 . The second protrusion 313 and the second caulking part 314 may have a cylindrical shape. The second protrusion 313 may be formed to protrude upward from the lower inner surface of the second fixing cap 311 . The second caulking part 314 may have a shape in which a lower area of the second protruding part 313 extends laterally. The second caulking part 314 may be formed at a height lower than that of the second protrusion part 313 . The end of the second caulking portion 314 may have a caulked area in a lateral direction. A detailed structure of the second electrode assembly 310 will be described later with reference to FIG. 5C.

The bellows 307 may be in the form of a corrugated pipe open at the top and bottom. The bellows 307 can accommodate the movable conductor 302 and the movable conductor guide 301 inside. The upper inner surface of the bellows 307 may be closely fixed to the outer circumferential surface of the movable conductor 302, and the lower surface of the bellows 307 may be closely fixed to the lower inner surface of the movable flange 300. As a result, the movable conductor 302 can move up and down while airtightness is maintained between the inside and outside of the bellows 307 . The vacuum capacitor can maintain a vacuum state in a space connected to the fixed conductor 200, the body 10, the movable flange 300, and the bellows 307.

Hereinafter, a method for manufacturing a vacuum capacitor according to a preferred embodiment of the present invention will be described with reference to FIGS. 1 to 5B. Descriptions of items overlapping with those described above are omitted or simplified. With the following description, the structure of the vacuum capacitor seen above can be made clearer. The following description is common to the first electrode assembly 210 and the second electrode assembly 310 .

- Electrode assembly assembly process -

As shown in FIG. 2A, fixing cups 211 and 311 having one side open may be prepared. Also, the brazing material 1 may be inserted into the caulking parts 214 and 314 . The caulking portions 214 and 314 may have a cylindrical shape.

Then, as shown in FIG. 2B , a plurality of electrodes 212 and 312 may be inserted inside the fixing cups 211 and 311 . Through the process of FIG. 2B , the electrode assemblies 210 and 310 may have the structure shown in FIG. 3 . Referring to FIGS. 3 and 4 , each of the plurality of electrodes 212 and 312 may have vertical portions 212a and 312a and horizontal portions 212b and 212b. The horizontal portions 212b and 212b may have a disk shape. The horizontal portions 212b and 212b may have fixing holes 212c and 312c at their centers. The fixing holes 212c and 312c may have a circular shape. The radii of the fixing holes 212c and 312c of the plurality of electrodes 212 and 312 may be the same, and the radii of the fixing holes 212c and 312c of the plurality of electrodes 212 and 312 may be caulking portions 214 and 314 may be equal to the radius of Accordingly, the centering operation of the plurality of electrodes 212 and 312 may be facilitated. The vertical portions 212a and 312a may extend directly upward from the outer circumferential surfaces of the horizontal portions 212b and 212b. Accordingly, the plurality of electrodes 212 and 312 may have a cylindrical shape. At this time, the radius of the horizontal portions 212b and 212b of the electrodes 212 and 312 located on the inner side of the plurality of neighboring electrodes 212 and 312 is the horizontal portion 212b and 212b of the electrodes 212 and 312 located on the outer side. It may be larger than the radius of by a preset unit interval. Accordingly, the vertical portions 212a and 312a of the neighboring electrodes 212 and 312 may be as large as a predetermined unit interval. Upper ends of the vertical portions 212a and 312a of the plurality of electrodes 212 and 312 may be positioned on the same plane. The horizontal portions 212b and 212b of the plurality of electrodes 212 and 312 may have the same thickness. The vertical portions 212a and 212a of the plurality of electrodes 212 and 312 may have the same thickness. Among the plurality of electrodes 212 and 312, the horizontal portions 212b and 212b may be inserted into the caulking portions 214 and 314 in order from the largest to the smallest radius. In FIG. 3 , the height of the caulking portions 214 and 314 may be higher than the height of the plurality of electrodes 212 and 312 stacked together. Accordingly, regions of the caulking portions 214 and 314 exposed to the upper portions of the plurality of stacked electrodes 212 and 312 may be caulked through a caulking process.

In addition, the horizontal portion located at the lowermost part may be fixed on the fixing cups 211 and 311 through the brazing material 1 as a medium through brazing fusion.

- Caulk Process -

A caulking process may be performed after the electrode assembly assembly process.

A press (not shown) having a compression unit 1000 as shown in FIG. 5A may be prepared. A lower portion of the compression unit 1000 may have a hollow cylindrical shape open downward. Referring to FIG. 5B , the radius of the lower inner circumferential surface IS of the compression portion 1000 may be the same as that of the protruding portions 213 and 313 . Accordingly, a centering operation between the compression unit 1000 and the protrusions 213 and 313 may be facilitated. Also, the width of the bottom surface DS of the crimping part 1000 may be greater than that of the caulking parts 214 and 314 . As shown in FIG. 5C, by pressing the caulking parts 214 and 314 with the lower surface DS of the crimping part 100, the upper part of the caulking part 214 and 314 is caulked outwardly and the innermost electrode ( The horizontal portions 212b and 312b of the 211 and 312 may be pressed. Accordingly, the horizontal portions 212b and 312b of the plurality of electrodes 211 and 312 sequentially stacked on the brazing material 1 may be fixed on the fixing cups 211 and 311 . In FIG. 5C, reference numeral ' indicates a region caulked outward from the caulking portions 214 and 314.

Structures of the electrode assemblies 210 and 310 in FIG. 5C may be the same as those of the electrode assemblies 210 and 310 in FIG. 1 .

1: Brazing material
10: body
200: fixed conductor
211: first fixed cup
212: first electrode
212a, 212a: vertical part
212b, 212b: horizontal part
213: first protrusion
214: first caulking part
300: movable flange
301 Movable conductor guide
302: movable conductor
303: cup
304: shaft
305: bearing
306: movable electrode plate
307: Bellows
310: second electrode assembly
311: second fixed cap
312: second electrode
312a, 312a: vertical part
312b, 312b: horizontal part
313: second protrusion
314: second caulking part

Claims (5)

fixed cup;
a protrusion protruding from the center of the fixing cup;
a caulking portion extending in the lateral direction of the protrusion and formed at a height lower than that of the protrusion;
a brazing material inserted into the central portion of the caulking portion and disposed on the bottom of the fixed cup around the caulking portion; and
A plurality of electrodes having one end fixed by the caulking part and fixed to the bottom of the fixing cup via the brazing material by brazing fusion,
Each of the plurality of electrodes has a vertical portion and a horizontal portion,
The horizontal part has a disk shape,
The horizontal part has a fixing hole in the center,
The fixing hole has a circular shape,
The radii of the fixing holes of the plurality of electrodes are the same,
The radius of the fixing hole of the plurality of electrodes is the same as the radius of the caulking part,
The vertical portion extends directly upward from the outer circumferential surface of the horizontal portion,
Of the plurality of electrodes, the radius of the horizontal portion is sequentially inserted into the caulking portion in order from the largest to the smallest,
The height of the caulking portion is higher than the height at which all of the plurality of electrodes are stacked,
By pressing the caulking part, while the upper part of the caulking part is caulking outwardly, by pressing the horizontal part of the innermost electrode among the plurality of electrodes, the horizontal parts of the plurality of electrodes stacked in sequence are placed on the fixing cup. A vacuum capacitor characterized in that it is fixed.
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