CN217719328U

CN217719328U - Explosion-proof type high-voltage damping capacitor

Info

Publication number: CN217719328U
Application number: CN202221090350.8U
Authority: CN
Inventors: 王盼; 江海波; 王惠东; 陈榕; 杜宝玉
Original assignee: Sheng Ye Electrical Co ltd
Current assignee: Sheng Ye Electrical Co ltd
Priority date: 2022-05-07
Filing date: 2022-05-07
Publication date: 2022-11-01
Anticipated expiration: 2032-05-07

Abstract

The utility model discloses an explosion-proof high-voltage damping capacitor, which comprises a shell, an electrode core assembly and a cover plate, wherein an installation cavity is formed in the shell, and the electrode core assembly is installed in the installation cavity; the mounting cavity is provided with an opening, and the side wall of the opening is provided with folding parts which are mutually overlapped; the folding part is used for stretching under the action of external force; the cover plate is sealed and covered on the opening; and the cover plate is provided with a wiring terminal component, and the wiring terminal component extends into the opening through an explosion-proof lead and is electrically connected with the electrode core component. The utility model discloses an explosion-proof type high voltage damping resistor, but its electrode core subassembly assembles behind the shell, and the opening part lateral wall of shell is equipped with folding portion, can effectively realize explosion-proof function.

Description

Explosion-proof type high-voltage damping capacitor

Technical Field

The utility model relates to a high pressure damping absorption capacitor technical field especially relates to an explosion-proof type high pressure damping condenser.

Background

At present, a high-voltage damping absorption capacitor is used as an important component of a thyristor converter valve for direct-current transmission, is connected with a damping resistor in series to form a damping loop, is connected to two ends of a thyristor in parallel, realizes dynamic voltage-sharing of the thyristor in series, inhibits phase-change overshoot, provides an energy-taking path for a thyristor control unit, and has high requirements on operation reliability and fire resistance because the high-voltage damping absorption capacitor is installed in a core equipment converter of a converter station.

The high-voltage damping absorption capacitor applied in practical engineering is usually a dry metallized polypropylene film capacitor, and adopts a lower field strength design, and takes SF6 or mixed gas of SF6/N2 as a filling medium, thereby achieving the purpose of fire prevention. Although the self-healing characteristic of the metallized film capacitor can avoid the short circuit problem caused by the breakdown of local electric weak points, the electric weak points are more and more in the working period of 40 years, and the pressure inside the capacitor is more and more caused by a large amount of gas generated by the self-healing breakdown or self-healing failure, so that the risk of explosion exists.

SUMMERY OF THE UTILITY MODEL

In order to overcome the defects of the prior art, the utility model aims to provide an explosion-proof high-voltage damping resistor, its electrode core subassembly assembles behind the shell, and the opening part lateral wall of shell is equipped with folding portion, can effectively realize explosion-proof function.

The purpose of the utility model is realized by adopting the following technical scheme:

an explosion-proof high-voltage damping capacitor comprises a shell, an electrode core assembly and a cover plate, wherein an installation cavity is formed in the shell, and the electrode core assembly is installed in the installation cavity; the mounting cavity is provided with an opening, and the side wall of the opening is provided with folding parts which are mutually overlapped; the folding part is used for stretching under the action of external force; the cover plate is sealed and covered on the opening; and the cover plate is provided with a wiring terminal component, and the wiring terminal component extends into the opening through an explosion-proof lead and is electrically connected with the electrode core component.

Furthermore, an explosion-proof notch is arranged on the explosion-proof lead.

Further, the explosion-proof notch is an arc notch or a plane notch.

Furthermore, the explosion-proof gap is arranged on the part of the explosion-proof lead wire, which is positioned in the opening.

Furthermore, an insulating plate is arranged on the end face of the electrode core assembly; the folding part is superposed and pressed on the insulating plate.

Further, the opening side wall is bent toward the insulating plate and folded back and forth to form the folded portion.

Further, the side wall of the top end of the opening is turned outwards and is formed into a first turned edge; the outer side edge of the cover plate is turned downwards and forms a second turned edge; the first flanging edge is clamped with the second flanging edge.

Furthermore, the first flanging edge is bent downwards and forms a clamping interval with the outer wall of the opening at intervals; and the second flanging edge is bent downwards and extends into the clamping interval so as to clamp the cover plate with the shell.

Further, the terminal assembly is insulated from the cover plate by an insulating sleeve.

Furthermore, the cover plate is provided with an introducing port; the lead-in port is used for leading in insulating gas and potting material into the shell; the potting material introduced from the introducing port is formed into a potting material layer below the cover plate; the encapsulating material layer and the electrode core assembly are arranged at intervals.

Compared with the prior art, the beneficial effects of the utility model reside in that:

1. when a large amount of self-healing breakdowns or self-healing failures occur in the capacitor, the explosion-proof lead wire can be broken by pressure generated inside the capacitor, and therefore the capacitor and an external power supply are cut off to achieve isolation and explosion prevention.

2. Set up the folding portion of mutual coincide on the opening lateral wall of shell, at the effect of condenser internal pressure, the folding portion can be pulled up, has increased the tensile stroke of explosion-proof lead wire, especially is located the explosion-proof line at apron edge, can realize effectively explosion-proofly, has avoided the secondary contact of explosion-proof lead wire breach department because of atmospheric pressure reduces the cause.

3. The explosion-proof notch of the explosion-proof lead is positioned above the electrode core assembly, so that the risk that the explosion-proof notch is locked by the core melt when the self-healing of the core of the electrode assembly fails can be avoided.

4. The foldable crimping of the folding part is on the insulating plate located on the end face of the electrode core assembly, so that the short circuit of the electrode shell of the electrode core assembly caused by the fact that the broken explosion-proof lead contacts the shell can be effectively avoided.

Drawings

Fig. 1 is a schematic view of the structure of the initial state of the present invention;

fig. 2 is a schematic view of another state structure of the present invention;

fig. 3 is another schematic structural diagram of the present invention.

In the figure: 10. a housing; 11. a folding part; 12. a first flanging edge; 20. an electrode core assembly; 30. a cover plate; 32. second flanging; 40. a terminal assembly; 41. an insulating sleeve; 50. an explosion-proof lead; 51. an explosion-proof notch; 60. a layer of potting material.

Detailed Description

The invention will be further described with reference to the accompanying drawings and specific embodiments:

in the description of the present invention, it should be noted that the terms "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like indicate orientations or positional relationships based on orientations or positional relationships shown in the drawings, and are only for convenience of description and simplification of the description, but do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention.

Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used in the description of the invention herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention.

As shown in fig. 1, 2 and 3, the explosion-proof high-voltage damping capacitor includes a housing 10, an electrode core assembly 20 and a cover plate 30, wherein a mounting cavity is formed in the housing 10, and the electrode core assembly 20 is mounted in the mounting cavity. The mounting cavity is provided with an opening, the side wall of the opening is provided with folded parts 11 which are overlapped with each other, and the folded parts 11 can be stretched when external force is applied. The cover plate 30 is sealed and covered on the opening, and the cover plate 30 is provided with a terminal assembly 40, the terminal assembly 40 can extend into the opening through the explosion-proof lead 50 and is electrically connected with the electrode core assembly 20.

On the basis of the structure, use the utility model discloses an explosion-proof type high voltage damping condenser time, when the assembly, can pack electrode core subassembly 20 into in the shell 10 through the opening on the shell 10, then on lapping the 30 closing cap on the opening, binding post subassembly 40 on the apron 30 can be through explosion-proof lead wire 50 and electrode core subassembly 20 electric connection, condenser alright normal use.

When a large amount of self-healing breakdowns or self-healing failures occur to the capacitor, the explosion-proof lead 50 can be broken by pressure generated inside the capacitor, and therefore connection between the capacitor and an external power source is cut off to achieve isolation and explosion prevention.

In addition, the folded parts 11 which are mutually overlapped are arranged on the side wall of the opening of the shell 10, under the action of the internal pressure of the capacitor, the folded parts 11 can be pulled up, the stretching stroke of the explosion-proof lead 50 is increased, especially the explosion-proof line positioned at the edge of the combined cover plate 30 can realize effective explosion-proof, and the secondary contact at the notch of the explosion-proof lead 50 caused by the reduction of air pressure is avoided.

It should be noted that, one or more terminal assemblies 40 may be provided, each terminal assembly 40 may be electrically connected to the electrode core assembly 20 through the explosion-proof lead 50, and each terminal assembly 40 has different electrical properties, so that at least 1 explosion-proof lead 50 may be provided for each explosion-proof lead 50 with different electrical properties.

Further, in this embodiment, an explosion-proof notch 51 may be disposed on the explosion-proof lead 50, the explosion-proof notch 51 may be disposed on the surface of the explosion-proof lead 50, when the internal pressure of the capacitor increases, the explosion-proof notch 51 on the explosion-proof lead 50 may form a stress point on the surface of the explosion-proof lead 50, and the pressure may be intensively applied to the explosion-proof notch 51 to drive the explosion-proof lead 50 to be rapidly broken, thereby achieving rapid explosion-proof.

In the case where the explosion-proof lead has an insulating sheath, the explosion-proof notch may be provided on the conductor covered with the insulating sheath through the sheath structure.

Further, the explosion-proof notch 51 is an arc notch or a plane notch, if an arc notch is selected, each point of the arc surface of the inner wall of the notch can be stressed to decompose the force, and the stress of each point is different, so that the explosion-proof lead 50 can be conveniently broken at the explosion-proof notch 51. If a planar notch is selected, the two side walls of the notch can be inclined surfaces which are arranged oppositely, the inclined surfaces on the two sides can form different stresses on the two sides of the notch, and the explosion-proof lead 50 can also be pulled off.

Further, the explosion-proof notch 51 is formed in the part of the explosion-proof lead 50 located in the opening, that is, the explosion-proof notch 51 is close to the cover plate 30, so that effective explosion-proof can be realized, and secondary contact between the notch of the explosion-proof lead 50 and the electrode core assembly 20 due to reduction of air pressure is avoided. And the explosion-proof notch 51 of the explosion-proof lead 50 is positioned above the electrode core assembly 20, so that the risk that the explosion-proof notch 51 is locked by the core melt when the core of the electrode assembly fails to self-heal can be avoided.

Of course, in the case of not having the above-mentioned explosion-proof notch 51, the part of the explosion-proof lead 50 at the opening can be made of a breakable material, and the above-mentioned explosion-proof effect can be achieved as well.

Furthermore, an insulating plate can be arranged on the end face of the electrode core assembly 20; the folded portion 11 is overlapped and pressed on the insulating plate, and after the explosion-proof lead 50 is broken, the broken explosion-proof lead 50 may fall off, and the insulating plate is provided to effectively prevent the broken explosion-proof lead 50 from contacting the housing 10 to cause a short circuit of the electrode case of the electrode core assembly 20.

The insulating plate may be formed of an insulating paint layer attached to the outer case or an insulating material layer provided in addition thereto.

Further, above-mentioned opening lateral wall is buckled and is reciprocal folding in order to form folding portion 11 towards the insulation board, and concrete shell 10 material can choose for use materials such as aluminum alloy to make, in the course of working, carries out reciprocal folding to the lateral wall of shell 10 opening position through the technology of bending, alright processing form still be above-mentioned folding portion 11, and when the atress, this folding part can be stretched in proper order, and can not appear revealing, and processing is convenient.

Further, the top end side wall of the opening in the embodiment is turned outwards, and is formed into the first turned edge 12, and is turned downwards and is formed into the second turned edge 32 correspondingly at the outer side edge of the cover plate 30, when the cover plate 30 is assembled with the opening of the housing 10, the first turned edge 12 on the housing 10 can be clamped with the second turned edge 32, the first turned edge 12 can be in sealing fit with the second turned edge 32, the first turned edge 12 is clamped with the second turned edge 32, when the internal pressure of the capacitor is increased, the first turned edge 12 and the second turned edge 32 can also be stressed and stretched, the effect of increasing the stretching stroke of the explosion-proof lead 50 can be achieved, and the explosion-proof effect is better.

More specifically, the first folded edge 12 may be bent downward and spaced apart from the outer wall of the opening to form a fastening space, and the second folded edge 32 is bent downward and extended into the fastening space to fasten the cover plate 30 to the housing 10, that is, both the first folded edge 12 and the second folded edge 32 have a bent portion, after fastening, the fastening structure of the first folded edge 12 and the second folded edge 32 is more stable, and when the first folded edge 12 is stressed and stretched, the bent portion needs to be straightened in the stretching process, so the stretching stroke is longer.

Further, the terminal assembly 40 is insulated from the cover plate 30 by the insulating sleeve 41, so that a specified creepage distance is realized, the insulating sleeve 41 can be made of insulating ceramic or insulating plastic and the like in the prior art, and the contact between the terminal assembly 40 and the shell is prevented from causing short circuit of the polar shell.

Further, the cover 30 may be provided with an inlet port through which the insulating gas and the insulating gas are introducedThe sealing material is filled into the housing 10, and specifically, after the cover plate 30 covers the opening of the housing 10, an insulating gas such as SF can be introduced into the inlet₆Or SF₆/N₂In this way, gas insulation can be formed inside the housing 10, preventing electrical leakage.

Similarly, the lead-in opening can also be used for introducing a potting material, and the potting material can be used for potting and sealing after gas is introduced, so that the sealing effect of the capacitor is better.

After the gas introduction and potting operations are completed, the introduction port may be sealed by a plug.

Of course, the potting material may be formed as a potting material layer below the cover plate 30; the potting material layer and the electrode core assembly 20 are arranged at intervals, so that the explosion-proof notch 51 of the explosion-proof lead 50 can be located in the interval at the interval between the potting material layer and the electrode core assembly 20, and the pressure of the capacitor is directly applied to the explosion-proof notch 51 in the later period when the pressure of the capacitor is increased.

Specifically, the electrode core assembly 20 in this embodiment can select the electrode core and the electrode shell structure in the prior art, and coat the electrode shell outside the electrode core, and then the electrode shell is placed in the mounting cavity of the housing 10, and the hole is provided on the electrode shell for the explosion-proof lead 50 to penetrate and electrically connect with the electrode core. After the insulating gas is introduced, the insulating gas may be filled in a gap between the electrode shell and the housing 10 after assembly, thereby achieving gas insulation.

Various other modifications and changes can be made by those skilled in the art based on the above-described technical solutions and concepts, and all such modifications and changes should fall within the scope of the claims.

Claims

1. An explosion-proof high-voltage damping capacitor comprises a shell, an electrode core assembly and a cover plate, wherein an installation cavity is formed in the shell, and the electrode core assembly is installed in the installation cavity; the mounting structure is characterized in that the mounting cavity is provided with an opening, and the side wall of the opening is provided with folding parts which are mutually overlapped; the folding part is used for stretching under the action of external force; the cover plate is sealed and covered on the opening; and the cover plate is provided with a wiring terminal component, and the wiring terminal component extends into the opening through an explosion-proof lead and is electrically connected with the electrode core component.

2. An explosion proof high voltage damping capacitor as defined in claim 1 in which said explosion proof lead is provided with an explosion proof notch.

3. An explosion proof type high voltage damping capacitor as claimed in claim 2, wherein said explosion proof notch is a circular arc notch or a plane notch.

4. An explosion proof high voltage damping capacitor as defined in claim 2 in which said explosion proof notch is provided in the portion of the explosion proof lead located in said opening.

5. An explosion proof type high voltage damping capacitor according to any one of claims 1 to 4, wherein an insulating plate is provided on the end face of the electrode core assembly; the folding part is superposed and pressed on the insulating plate.

6. An explosion proof type high voltage damping capacitor as set forth in claim 5, wherein said opening side wall is bent toward said insulating plate and folded back and forth to form said folded portion.

7. An explosion proof type high voltage damping capacitor as defined in any one of claims 1 to 4 wherein the top end side wall of said opening is folded outwardly and formed as a first folded edge; the outer side edge of the cover plate is turned downwards and forms a second turned edge; the first flanging edge is clamped with the second flanging edge.

8. An explosion-proof high-voltage damping capacitor as defined in claim 7, wherein the first folded edge is folded downwards and forms a clamping space with the outer wall of the opening; and the second flanging edge is bent downwards and extends into the clamping interval so as to clamp the cover plate and the shell.

9. An explosion proof high voltage damping capacitor as defined in any one of claims 1 to 4 wherein said terminal assembly is insulated from the cover plate by an insulating sleeve.

10. An explosion proof type high voltage damping capacitor according to any one of claims 1 to 4 wherein an inlet port is provided on the cover plate; the lead-in port is used for leading in insulating gas and potting material into the shell; the potting material introduced from the introducing port is formed into a potting material layer below the cover plate; the encapsulating material layer and the electrode core assembly are arranged at intervals.