CN221101881U - Insulating supporting mechanism and capacitor - Google Patents

Abstract

The utility model relates to the technical field of capacitors and discloses an insulating supporting mechanism and a capacitor, wherein the insulating supporting mechanism comprises a supporting component formed by stacking a plurality of magnetic metal plates; the magnetic metal plate extends inwards from the outer side to form a cake-shaped structure with radian; the support component is formed by assembling 2 groups of magnetic metal plates; compared with the traditional design requiring cold-filling process and polishing process, the utility model can finish manufacturing by adopting double-layer assembly and only adopting the tooling pressing process, thereby not only reducing the manufacturing cost required during manufacturing, but also effectively reducing the time required during manufacturing, greatly reducing the cost, ensuring that the multilayer insulating film always keeps horizontal and is not overlapped with each other when applying pressure to the multilayer insulating film, and improving the overall withstand voltage level of the capacitor.

Description

Insulating supporting mechanism and capacitor

Technical Field

The utility model relates to the technical field of capacitors and insulating supports, in particular to an insulating support mechanism and a capacitor.

Background

Parallel plate capacitors are one of the simplest capacitors consisting of an insulating material-dielectric sandwiched between two closely spaced parallel metal plates. Multilayer insulating films of the same thickness have much higher insulating strength than bulk insulating materials of the same thickness, and thus multilayer films are commonly used to produce high voltage tolerant flat panel capacitors.

The capacitance of a plate capacitor is related to the dielectric constant of the insulating medium, the spacing between the electrodes and the electrode area, and in the case of a material and electrode area determination, the capacitance size depends on the spacing between the electrodes. The insulating films are stacked together, air is inevitably generated in the middle, certain pressure is required to be applied to maintain the stability of the capacitor, and the insulating screw is used for applying pressure, so that the problem of shortening the insulation distance along the surface is caused.

At present, the theory of a peaking capacitor which compresses a film by utilizing the suction force between powerful magnets is provided, the mode can theoretically realize the stability of a capacitance value, and meanwhile, the insulation weak links are reduced, but the manufacturing process of the capacitor is complex, and the cold-charging and grinding processes are required to be carried out, so that the manufacturing cost is high.

The interface is used as a transition phase of an insulating structure, is commonly found in high-voltage power transmission and transformation equipment, a strong electromagnetic energy generating device and electric energy conversion and transmission facilities, and is important to high-performance insulating design. The dielectric properties of the materials at the interfaces of gas, solid, liquid, solid and the like are different, so that the surface insulation strength is obviously lower than that of the insulating material body, and the insulating effect of the traditional block insulating material is not ideal in actual use.

Disclosure of utility model

The present utility model has been made in view of the above-mentioned problems of complicated manufacturing process in the prior art.

Accordingly, it is an object of the present utility model to provide an insulating support mechanism, which aims at: the manufacturing process is reduced, and the production and the manufacturing are convenient.

In order to solve the technical problems, the utility model provides the following technical scheme: an insulating support mechanism, comprising,

A support assembly formed by stacking a plurality of magnetic metal plates;

The magnetic metal plate is of a cake-shaped structure with the outer side extending inwards to form an arc.

As a preferable embodiment of the insulating support mechanism of the present utility model, wherein: the support component is formed by assembling 2 groups of magnetic metal plates;

The magnetic metal plate comprises a first contact surface extending from a Z point to a K point to form a plane, a second contact surface extending from the K point to a J point to form an arc surface, a third contact surface extending from the J point to a U point to form an arc surface, and a fourth contact surface extending from the U point to an O point to form a plane;

the support assembly is formed by bonding the first contact surfaces of the two groups of magnetic metal plates.

As a preferable embodiment of the insulating support mechanism of the present utility model, wherein: the inner side surface of the magnetic metal plate is provided with a mounting hole, and a connecting piece is arranged in the mounting hole;

The connecting piece comprises a limiting ring arranged in the mounting hole and a powerful magnet arranged in the mounting hole.

The utility model also provides a capacitor.

As a preferred embodiment of the capacitor according to the present utility model, wherein: a capacitor comprises the insulating supporting mechanism and also comprises,

The solid magnetic permeability metal plate is arranged at the X-direction end or the Y-direction end of the supporting component through the cooperation with the insulator.

As a preferred embodiment of the capacitor according to the present utility model, wherein: the insulator comprises a plurality of layers of insulating films, an upper compression insulating ring and a lower support insulating ring for supporting the plurality of layers of insulating films to prevent deformation;

The support assembly is disposed between the solid magnetically permeable metal plates through the insulator.

As a preferred embodiment of the capacitor according to the present utility model, wherein: one end of the multilayer insulating film in the Y direction is supported by the lower supporting insulating ring, and the other end of the multilayer insulating film in the X direction is pressed by the upper pressing insulating ring and is matched with the lower supporting insulating ring to form the insulator;

Wherein the inner diameter of the lower support insulating ring is smaller than the inner diameter of the upper compression insulating ring, and the inner diameter of the lower support insulating ring is equal to the diameter of the fourth contact surface;

The outer diameters of the multilayer insulating film, the upper compression insulating ring and the lower support insulating ring are the same.

The utility model also provides a manufacturing method of the capacitor.

As a preferable embodiment of the method for manufacturing a capacitor of the present utility model, the method comprises: a method for manufacturing a capacitor is used for manufacturing the capacitor, and further comprises the following steps of,

The powerful magnet is arranged in the limiting ring;

and attracting the two ends of the powerful magnet with the magnetic metal plate magnetic poles at the two ends of the respective X direction and Y direction.

As a preferable embodiment of the method for manufacturing a capacitor of the present utility model, the method comprises: installing the limiting ring in the installation hole;

The powerful magnet is filled in the limiting ring;

closing the two pieces of magnetic metal by using a tool;

Before the 2 groups of magnetic metal plates are attached, the directions of NS poles at the two ends of each powerful magnet are consistent;

The thickness formulas of the powerful magnet, the limiting ring and the magnetic metal plate are as follows:

0＜d1-2×d2＜0.2mm，d3＜d2

wherein d1 is the thickness of the strong magnet;

d2 is the opening depth of the mounting hole;

d3 is the thickness of the limiting ring.

As a preferable embodiment of the method for manufacturing a capacitor of the present utility model, the method comprises: arranging the upper compression insulating ring with the outer diameter the same as that of the multilayer insulating film and the inner diameter larger than that of the fourth contact surface at the X-direction end of the multilayer insulating film;

Arranging the lower supporting insulating ring with the outer diameter identical to that of the multilayer insulating film and the inner diameter identical to that of the fourth contact surface at the Y-direction end of the multilayer insulating film;

Clamping the multilayer insulating film by the upper pressing insulating ring and the lower supporting insulating ring and forming the insulator;

Splicing and combining 2 groups of the magnetic metal plates;

And the capacitor is formed by matching the insulator with the solid magnetic permeability metal plate at the X-direction end or the Y-direction end of the magnetic metal plate.

As a preferable embodiment of the method for manufacturing a capacitor of the present utility model, the method comprises: the solid magnetic permeability metal plate is made of magnetic permeability material, preferably carbon steel chromium plating material.

The utility model has the beneficial effects that: compared with the traditional design requiring cold-filling process and polishing process, the utility model can finish manufacturing by adopting double-layer assembly and only adopting the tooling pressing process, thereby not only reducing the manufacturing cost required during manufacturing, but also effectively reducing the time required during manufacturing, greatly reducing the cost, ensuring that the multilayer insulating film always keeps horizontal and is not overlapped with each other when applying pressure to the multilayer insulating film, and improving the overall withstand voltage level of the capacitor.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present utility model, the drawings required for the description of the embodiments will be briefly described below, it being obvious that the drawings in the following description are only some embodiments of the present utility model, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art. Wherein:

fig. 1 is a schematic diagram of the overall structure of the capacitor of the present utility model.

Fig. 2 is a schematic structural view of a magnetic metal plate according to the present utility model.

Fig. 3 is a schematic view of a magnetic metal plate according to the present utility model.

Fig. 4 is a schematic cross-sectional structure of the present utility model.

Fig. 5 is a schematic diagram of a prior art structure of the present utility model.

Detailed Description

In order that the above-recited objects, features and advantages of the present utility model will become more readily apparent, a more particular description of the utility model will be rendered by reference to specific embodiments thereof which are illustrated in the appended drawings.

In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present utility model, but the present utility model may be practiced in other ways other than those described herein, and persons skilled in the art will readily appreciate that the present utility model is not limited to the specific embodiments disclosed below.

Further, reference herein to "one embodiment" or "an embodiment" means that a particular feature, structure, or characteristic can be included in at least one implementation of the utility model. The appearances of the phrase "in one embodiment" in various places in the specification are not necessarily all referring to the same embodiment, nor are separate or alternative embodiments mutually exclusive of other embodiments.

In describing the embodiments of the present utility model in detail, the cross-sectional view of the device structure is not partially enlarged to a general scale, and the schematic drawings are only examples, which should not limit the scope of the present utility model. In addition, the three-dimensional dimensions of length, width and depth should be included in actual fabrication.

Example 1

Referring to fig. 1-5, for a first embodiment of the present utility model, there is provided an insulating support mechanism, the apparatus comprising,

A support member 101 formed by stacking a plurality of magnetic metal plates 101 a;

The magnetic metal plate 101a has a cake-like structure with an arc shape extending outward and inward.

Specifically, the supporting component 101 is formed by splicing 2 groups of magnetic metal plates 101 a;

The magnetic metal plate 101a includes a first contact surface 101a-1 extending from the point Z to the point K to form a plane, a second contact surface 101a-2 extending from the point K to the point J to form an arc surface, a third contact surface 101a-3 extending from the point J to the point U to form an arc surface, and a fourth contact surface 101a-4 extending from the point U to the point O to form a plane;

The supporting component 101 is formed by attaching the first contact surfaces 101a-1 of two groups of magnetic metal plates 101 a.

Further, an installation hole 101b is formed in the inner side surface of the magnetic metal plate 101a, and a connecting piece 101c is arranged in the installation hole 101 b;

The connector 101c includes a stopper ring 101c-1 provided inside the mounting hole 101b, and a strong magnet 101c-2 provided inside the mounting hole 101 b.

The prior art is that a whole metal plate 1 is provided with a through hole in the middle of the whole metal plate 1, then after a magnet 2 is put in, both sides are plugged by metal covers 3, because the metal covers 3 need to tightly plug the original holes, the metal covers 3 and the holes need to be in interference fit, a cold filling process is needed, the metal covers 3 need to be cooled by liquid nitrogen firstly, the diameters of the metal covers are reduced, and after the metal covers are plugged into the holes, the metal covers expand after heating, the diameters of the metal covers become larger, so that the holes are plugged; moreover, when the metal cap 3 is put into the hole, the metal cap cannot be as flat as the outer surface of the electrode after being mounted by the cold-mounting process, and the metal cap is required to be ground by an integral grinding machine in order to meet the flatness requirement, so that the production efficiency is low and the manufacturing cost is very high.

According to the utility model, the traditional metal plates are split into two groups, the metal plates with magnetic attraction are adopted, the installation holes 101b are formed in the magnetic metal plates 101a, the installation holes 101b do not penetrate through the installation holes 101b, at the moment, the limit rings 101c-1 are preferentially embedded in the installation holes 101b, the powerful magnets 101c-2 are embedded in the limit rings 101c-1, so that the installation of one group of connecting pieces 101c is completed, the connecting pieces 101c are installed in the installation holes 101b according to the installation method, after the installation is completed, the directions of NS pole requirements at two ends of each powerful magnet 101c-2 are checked to be consistent, and finally, the two groups of magnetic metal plates 101a are assembled by closing two pieces of electrodes.

In summary, compared with the traditional design requiring a cold-filling process and a polishing process, the utility model can finish the manufacturing by adopting a double-layer assembly design and only adopting a tooling pressing process, thereby not only reducing the manufacturing cost required during the manufacturing, but also effectively reducing the time required during the manufacturing and greatly reducing the cost.

Example 2

Referring to fig. 1 to 4, a second embodiment of the present utility model is different from the first embodiment in that: there is provided a capacitor comprising an insulating support mechanism, further comprising,

The solid magnetic conductive metal plate 102 is provided at the X-direction end or the Y-direction end of the support member 101 by being fitted with the insulator 103.

Further, the insulator 103 includes a multilayer insulating film 103a, and an upper pressing insulating ring 103b and a lower supporting insulating ring 103c for supporting the multilayer insulating film 103a from deformation;

the support members 101 are disposed between solid magnetically permeable metal plates 102 by insulators 103.

Further, one end of the multilayer insulating film 103a in the Y direction is supported by the lower supporting insulating ring 103c, and the other end of the multilayer insulating film 103a in the X direction is compressed by the upper compressing insulating ring 103b and cooperates with the lower supporting insulating ring 103c to form the insulator 103;

wherein the inner diameter of the lower supporting insulating ring 103c is smaller than the inner diameter of the upper pressing insulating ring 103b, and the inner diameter of the lower supporting insulating ring 103c is equal to the diameter of the fourth contact surface 101 a-4;

The outer diameters of the multilayer insulating film 103a, the upper pressing insulating ring 103b, and the lower supporting insulating ring 103c are the same.

The existing flat capacitor consists of an upper polar plate, one or more middle polar plates, a lower polar plate and a series of insulating films. Since the capacitance of the plate capacitor is generally very small, most of the plate capacitor is insulated by air, in order to stabilize the capacitance, the insulating screw is usually used to apply pressure, or pressure is generated by mutual attraction of magnetic force, but the insulating film is caused to sag under the action of extrusion force and self gravity, so that the film between two layers is lapped, the insulation distance along the surface is shortened, the insulation distance along the surface can be understood to be twice the length of the stretched film, because the two surfaces are along the surface, if the film between two layers of electrodes is lapped, the distance along the surface can be understood to be changed from 4l to 2l.

The utility model sets the lower support insulating ring 103c with the same outer diameter as the multi-layer insulating film 103a and the same inner diameter as the fourth contact surface 101a-4 at the lower end of the multi-layer insulating film 103a, thereby supporting the lower end of the multi-layer insulating film 103a, and the inner wall of the lower support insulating ring 103c is attached to the third contact surface 101a-3 due to the fact that the inner diameter of the lower support insulating ring 103c is set to be the same as the diameter of the fourth contact surface 101a-4, so as to avoid the deflection of the lower support insulating ring 103c when the multi-layer insulating film 103a is installed, and the same outer diameter can fully support the multi-layer insulating film 103 a;

An upper pressing insulating ring 103b having the same outer diameter as the multilayer insulating film 103a and an inner diameter larger than the diameter of the fourth contact surface 101a-4 is provided at the upper end of the multilayer insulating film 103 a; therefore, the situation that the two groups of multi-layer insulating films 103a are overlapped newly due to electrostatic attraction of charges after the upper group and the lower group of multi-layer insulating films 103a are electrified can be avoided, and the multi-layer insulating films 103a between the two metal electrodes cannot be pressed due to the fact that the inner diameter of the upper pressing insulating ring 103b is larger than the diameter of the fourth contact surface 101a-4, and therefore the upper pressing insulating ring 103b is prevented from shifting when the electrodes are stacked.

In summary, by the two groups of upper pressing insulating rings 103b with special shapes and different positions, the lower supporting insulating rings 103c can ensure that the multilayer insulating film 103a is always stable while applying pressure to the multilayer insulating film 103a, thereby improving the overall quality of the capacitor.

Example 3

Referring to fig. 1 to 4, a third embodiment of the present utility model is different from the second embodiment in that: a method for manufacturing a capacitor is used for manufacturing the capacitor, and further comprises the following steps of,

A powerful magnet 101c-2 is arranged in the limit ring 101 c-1;

Both ends of the strong magnet 101c-2 are attracted to the magnetic poles of the magnetic metal plates 101a at both ends in the X-direction and the Y-direction, respectively.

Further, the retainer ring 101c-1 is installed in the installation hole 101 b;

The limit ring 101c-1 is internally filled with a powerful magnet 101c-2;

closing the two magnetic metal plates 101a by using a tool;

Before the 2 groups of magnetic metal plates 101a are attached, the directions of NS poles at the two ends of each powerful magnet 101c-2 are consistent;

the thickness formula of the strong magnet 101c-2, the stopper ring 101c-1 and the magnetic metal plate 101a is as follows:

0＜d1-2×d2＜0.2mm，d3＜d2

Wherein d1 is the thickness of the strong magnet 101 c-2;

d2 is the opening depth of the mounting hole 101 b;

d3 is the thickness of the stop collar 101 c-1.

Further, an upper pressing insulating ring 103b having the same outer diameter as the multilayer insulating film 103a and an inner diameter larger than the diameter of the fourth contact surface 101a-4 is provided at the end of the multilayer insulating film 103aX direction;

A lower supporting insulating ring 103c having the same outer diameter as the multilayer insulating film 103a and the same inner diameter as the diameter of the fourth contact surface 101a-4 is provided at the end of the multilayer insulating film 103aY in the direction;

the multilayer insulating film 103a is sandwiched and formed by the upper pressing insulating ring 103b and the lower supporting insulating ring 103c to form an insulator 103;

splicing and combining 2 groups of magnetic metal plates 101 a;

the capacitor is formed by the insulator 103 at the X-direction end or Y-direction end of the magnetic metal plate 101a and the solid magnetically permeable metal plate 102.

Preferably, the solid magnetic conductive metal plate 102 is made of magnetic conductive material, and can be preferably made of carbon steel chrome plating material, so that the metal plate has good magnetic conductivity and corrosion resistance, and has good economical efficiency.

When the device is installed, firstly, the limiting rings 101c-1 are installed in the installation holes 101b, the powerful magnets 101c-2 are embedded in the limiting rings 101c-1, after the powerful magnets 101c-2 of each group are installed, the two ends of each powerful magnet 101c-2 of each group face towards the same direction, and at the moment, the two groups of magnetic metal plates 101a are pressed together to form an electrode through a tool;

The thickness of the strong magnet 101c-2 needs to be greater than twice the depth of the mounting hole 101b, so that when the strong magnet 101c-2 is mounted in the mounting hole 101b, the two poles of the strong magnet 101c-2 can be ensured to be well contacted with the magnetic metal plate 101a, no air gap is ensured in the middle, if the air gap exists, the attraction force between the magnetic polar plates can be greatly reduced due to poor air magnetic permeability, and the thickness of the strong magnet 101c-2 is limited to be less than 0.2mm while being greater than twice the depth of the mounting hole 101b, the outer edge can be ensured to be still in a circular arc shape when the two magnetic metal plates 101a are combined together, and if the gap is too large, the electric field distribution is not a complete circular arc, so that the insulation efficiency is reduced;

By setting the thickness of the limiting ring 101c-1 smaller than the depth of the mounting hole 101b, the two stages of the powerful magnet 101c-2 are enabled to be well contacted with the magnetic metal plates 101a when the two magnetic metal plates 101a are pressed, so that the situation that the magnetic metal plates 101a are propped against and the mounting effect is caused when the pressing work is performed due to overhigh pressure is avoided;

After the support assembly 101 is mounted, a plurality of insulating films 103a clamped by the upper pressing insulating ring 103b and the lower supporting insulating ring 103c are placed on the surface of the solid magnetic conductive metal plate 102, and the inner diameter of the lower supporting insulating ring 103c is clamped at the top end of the solid magnetic conductive metal plate 102, then the support assembly 101 is placed on the upper side of the plurality of insulating films 103a, a group of insulators 103 are placed on the upper side of the support assembly 101, and finally the solid magnetic conductive metal plate 102 is placed on the upper side of the insulators 103, and so on, the support assembly 101 and the magnetic metal plate 102 are placed alternately, and the insulators 103 are required to be placed directly on the support assembly 101 and the magnetic metal plate 102, so that the assembly of the capacitor is completed.

In summary, compared with the traditional design requiring cold-filling process and polishing process, the utility model can finish the manufacturing by adopting the double-layer assembly design and only adopting the tooling pressing process, thereby not only reducing the manufacturing cost required during the manufacturing, but also effectively reducing the time required during the manufacturing, greatly reducing the cost, and ensuring that the multilayer insulating film 103a is always kept horizontal and the mutual overlapping is not generated when the pressure is applied to the multilayer insulating film 103a by arranging the upper pressing insulating ring 103b and the lower supporting insulating ring 103c in two groups of special shapes and different positions, thereby improving the overall voltage resistance level of the capacitor.

Example 4

Referring to fig. 1 to 4, a fourth embodiment of the present invention is different from the third embodiment in that: the composition mode of placing the insulator 103 between the solid magnetic conductive metal plate 102 and the supporting component 101 not only can be used for composing the capacitor, but also can be used for accumulating and stacking proper layers for insulating and supporting according to specific voltage conditions compared with the traditional mode of insulating by using a block-shaped insulating material (usually an insulating rod), so that the field distribution can be remarkably improved, the field distribution is more uniform, the insulation utilization efficiency is greatly improved, compared with the design of the traditional block-shaped insulating material, the number of layers can be freely adjusted, and the insulation effect is integrally improved.

It is important to note that the construction and arrangement of the utility model as shown in the various exemplary embodiments is illustrative only. Although only a few embodiments have been described in detail in this disclosure, those skilled in the art who review this disclosure will readily appreciate that many modifications are possible (e.g., variations in sizes, dimensions, structures, shapes and proportions of the various elements, values of parameters (e.g., temperature, pressure, etc.), mounting arrangements, use of materials, colors, orientations, etc.) without materially departing from the novel teachings and advantages of the subject matter described in this application. For example, elements shown as integrally formed may be constructed of multiple parts or elements, the position of elements may be reversed or otherwise varied, and the nature or number of discrete elements or positions may be altered or varied. Accordingly, all such modifications are intended to be included within the scope of present utility model. The order or sequence of any process or method steps may be varied or re-sequenced according to alternative embodiments. In the claims, any means-plus-function clause is intended to cover the structures described herein as performing the recited function and not only structural equivalents but also equivalent structures. Other substitutions, modifications, changes and omissions may be made in the design, operating conditions and arrangement of the exemplary embodiments without departing from the scope of the present utility models. Therefore, the utility model is not limited to the specific embodiments, but extends to various modifications that nevertheless fall within the scope of the appended claims.

Furthermore, in an effort to provide a concise description of the exemplary embodiments, all features of an actual implementation may not be described (i.e., those not associated with the best mode presently contemplated for carrying out the utility model, or those not associated with practicing the utility model).

It should be noted that the above embodiments are only for illustrating the technical solution of the present utility model and not for limiting the same, and although the present utility model has been described in detail with reference to the preferred embodiments, it should be understood by those skilled in the art that the technical solution of the present utility model may be modified or substituted without departing from the spirit and scope of the technical solution of the present utility model, which is intended to be covered in the scope of the claims of the present utility model.

Claims (8)

1. An insulating supporting mechanism which is characterized in that: comprising the steps of (a) a step of,

A support member (101) formed by stacking a plurality of magnetic metal plates (101 a);

The magnetic metal plate (101 a) is a cake-shaped structure with an arc formed by extending outwards and inwards.

2. The insulating support mechanism of claim 1, wherein: the supporting component (101) is formed by assembling 2 groups of magnetic metal plates (101 a);

The magnetic metal plate (101 a) comprises a first contact surface (101 a-1) extending from a Z point to a K point to form a plane, a second contact surface (101 a-2) extending from the K point to a J point to form an arc surface, a third contact surface (101 a-3) extending from the J point to a U point to form an arc surface, and a fourth contact surface (101 a-4) extending from the U point to the O point to form a plane;

The supporting component (101) is formed by bonding the first contact surfaces (101 a-1) of two groups of magnetic metal plates (101 a).

3. The insulating support mechanism of claim 2, wherein: the magnetic metal plate (101 a) is provided with a mounting hole (101 b) on the inner side surface, and a connecting piece (101 c) is arranged in the mounting hole (101 b).

4. An insulating support mechanism according to claim 3, wherein: the connecting piece (101 c) comprises a limiting ring (101 c-1) arranged in the mounting hole (101 b) and a powerful magnet (101 c-2) arranged in the mounting hole (101 b).

5. A capacitor, characterized by: comprising the insulating support mechanism of claim 3 or 4, further comprising,

The solid magnetic conductive metal plate (102) is arranged at the X-direction end or the Y-direction end of the supporting component (101) through matching with the insulator (103).

6. The capacitor of claim 5, wherein: the insulator (103) includes a multilayer insulating film (103 a), and an upper pressing insulating ring (103 b) and a lower supporting insulating ring (103 c) for supporting the multilayer insulating film (103 a) against deformation;

The support assembly (101) is arranged between the solid magnetically permeable metal plates (102) through the insulator (103).

7. The capacitor of claim 6, wherein: one end of the multilayer insulating film (103 a) in the Y direction is supported by the lower supporting insulating ring (103 c), and the other end of the multilayer insulating film (103 a) in the X direction is compressed by the upper compressing insulating ring (103 b) and is matched with the lower supporting insulating ring (103 c) to form the insulator (103).

8. The capacitor of claim 7, wherein: the inner diameter of the lower supporting insulating ring (103 c) is smaller than the inner diameter of the upper pressing insulating ring (103 b), and the inner diameter of the lower supporting insulating ring (103 c) is equal to the diameter of the fourth contact surface (101 a-4);

The outer diameters of the multilayer insulating film (103 a), the upper pressing insulating ring (103 b) and the lower supporting insulating ring (103 c) are the same.