阅读说明：本技术 一种均压电容器 (Voltage-sharing capacitor ) 是由 黄创 薛福明 徐明利 唐陈 顾皓 侯家威 周新宇 于 2019-10-31 设计创作，主要内容包括：本发明涉及电容器技术领域,具体公开了一种均压电容器,包括绝缘套管、设置在套管内的膨胀器和电容元件组件,绝缘套管的顶端设有上端盖,底端设有下端盖；上端盖上设有顶部充气孔,顶部充气孔为阶梯螺纹孔,下端盖上设有底部注油孔,底部注油孔内设有底部密封盖；膨胀器设置在电容元件组件的上方,膨胀器固定在上端盖上,膨胀器外设有膨胀器罩；电容元件组件的两端均有导线引出,一端与膨胀器连接,另一端与下端盖连接。本发明均压电容器结构紧凑、密封性能和绝缘性能好,采用单向充气的方式,实现对充气孔的密封,以保证整个电容器的气密性；采用填充纸板和缓冲垫可承受运行或者运输中较大的机械振动和冲击载荷,确保产品电容量稳定。(The invention relates to the technical field of capacitors, and particularly discloses a voltage-sharing capacitor, which comprises an insulating sleeve, an expander and a capacitance element assembly, wherein the expander and the capacitance element assembly are arranged in the sleeve; the upper end cover is provided with a top inflation hole which is a stepped threaded hole, the lower end cover is provided with a bottom oil injection hole, and a bottom sealing cover is arranged in the bottom oil injection hole; the expander is arranged above the capacitance element assembly, the expander is fixed on the upper end cover, and an expander cover is arranged outside the expander; two ends of the capacitor element assembly are led out by leads, one end of the capacitor element assembly is connected with the expander, and the other end of the capacitor element assembly is connected with the lower end cover. The voltage-sharing capacitor has compact structure and good sealing performance and insulating performance, and realizes the sealing of the inflation hole by adopting a one-way inflation mode so as to ensure the air tightness of the whole capacitor; the filled paperboard and the cushion can bear larger mechanical vibration and impact load in operation or transportation, and ensure the stable capacitance of the product.)

1. A voltage-sharing capacitor is characterized by comprising an insulating sleeve, an expander and a capacitance element assembly, wherein the expander and the capacitance element assembly are arranged in the sleeve;

the upper end cover is provided with a top inflation hole which is a stepped threaded hole and comprises a first threaded hole and a second threaded hole, a top sealing cover is arranged in the first threaded hole, a threaded sealing plug is arranged in the second threaded hole, sealing gaskets are arranged at the bottoms of the threaded sealing plug and the second threaded hole, a bottom oil filling hole is arranged on the lower end cover, and a bottom sealing cover is arranged in the bottom oil filling hole;

the expander is arranged above the capacitor element assembly, the expander is fixed on the upper end cover, an expander cover is arranged outside the expander, and the expander cover and the upper end cover are fixedly welded;

the capacitor element assembly is placed on the lower end cover, two ends of the capacitor element assembly are led out by leads, one end of the capacitor element assembly is connected with the expander, and the other end of the capacitor element assembly is connected with the lower end cover.

2. A voltage sharing capacitor as claimed in claim 1 wherein a cushion is provided between said expander and said capacitor element assembly, said cushion having a top abutting said expander cover and a bottom pressing said capacitor element assembly.

3. A voltage-sharing capacitor according to claim 1, wherein said capacitor element assembly comprises a plurality of capacitor elements connected in series, a U-shaped supporting plate and a filling paper plate, said U-shaped supporting plate being inverted on said lower end cap, said capacitor elements being disposed in said U-shaped supporting plate, and a stopper pin being provided at the bottom of said U-shaped supporting plate; a gasket is arranged between the top of the capacitor element and the U-shaped supporting plate, and a gasket is also arranged between the bottom of the capacitor element and the stop pin; the filling paperboards are arranged on the periphery of the U-shaped supporting plate and fixed through oil-resistant adhesive tapes, and the cross sections of the filling paperboards are in a step shape.

4. A voltage grading capacitor according to claim 3, wherein said capacitor element is wound from polypropylene film, capacitor paper and aluminium foil.

5. The voltage-sharing capacitor as claimed in claim 1, wherein the top metal flange is clamped on the outer side of the top cover, the top metal flange is locked with the insulating sleeve through threads, a sealant is coated between the top metal flange and the top cover, a sealant is also coated between the top metal flange and the insulating sleeve, and a first sealing ring is arranged between the top cover and the end face of the insulating sleeve.

6. The voltage-sharing capacitor as claimed in claim 1, wherein the bottom metal flange is clamped on the outer side of the bottom end cap, the bottom metal flange is locked with the insulating sleeve through threads, a sealant is coated between the bottom metal flange and the bottom end cap, a sealant is also coated between the bottom metal flange and the insulating sleeve, and a second sealing ring is arranged between the bottom end cap and the end face of the insulating sleeve.

7. A voltage grading capacitor according to claim 1, wherein a third sealing ring is provided between said top sealing cover and the bottom of said first threaded hole.

8. The voltage sharing capacitor according to claim 1, wherein the bottom sealing cover comprises a transverse portion and a vertical portion, the transverse portion is fixed below the vertical portion, and fourth sealing rings are arranged between the side wall and the end face of the transverse portion and the lower end cover.

Technical Field

The invention relates to the technical field of capacitors, in particular to a voltage-sharing capacitor.

Background

Along with the development of economy, the power capacity of a power grid is gradually increased, and voltage-sharing capacitor equipment is widely applied to the high-voltage and ultrahigh-voltage fields and is also used in the extra-high-voltage field. The voltage-sharing capacitor is mainly used for improving the unbalanced voltage distribution between the fractures of the circuit breaker, reducing the speed of restoring the voltage rise rate and improving the breaking capacity and the overall insulation level of the circuit breaker. There is room for significant improvement in the prior art voltage grading capacitors with respect to important performance sealing and insulating properties.

Disclosure of Invention

The invention aims to solve the technical problem of providing a voltage-sharing capacitor with good sealing performance and insulating performance aiming at the defects of the prior art.

In order to solve the technical problem, the invention provides a voltage-sharing capacitor which comprises an insulating sleeve, an expander and a capacitance element assembly, wherein the expander and the capacitance element assembly are arranged in the sleeve;

the upper end cover is provided with a top inflation hole which is a stepped threaded hole and comprises a first threaded hole and a second threaded hole, a top sealing cover is arranged in the first threaded hole, a threaded sealing plug is arranged in the second threaded hole, and sealing gaskets are arranged at the bottoms of the threaded sealing plug and the second threaded hole; a bottom oil injection hole is formed in the lower end cover, and a bottom sealing cover is arranged in the bottom oil injection hole;

the expander is arranged above the capacitor element assembly, the expander is welded with the upper end cover into a whole, an expander cover is arranged outside the expander, and the expander cover and the upper end cover are welded and fixed;

the capacitor element assembly is placed on the lower end cover, two ends of the capacitor element assembly are led out by leads, one end of the capacitor element assembly is connected with the expander, and the other end of the capacitor element assembly is connected with the lower end cover.

Furthermore, a buffer cushion is arranged between the expander and the capacitor element assembly, the top of the buffer cushion is tightly attached to the expander cover, and the bottom of the buffer cushion is pressed against the capacitor element assembly.

Further, the capacitor element assembly comprises a plurality of capacitor elements connected in series, a U-shaped supporting plate and a filling paperboard, the U-shaped supporting plate is inverted on the lower end cover, the capacitor elements are arranged in the U-shaped supporting plate, and a stop pin is arranged at the bottom of the U-shaped supporting plate; a gasket is arranged between the top of the capacitor element and the U-shaped supporting plate, and a gasket is also arranged between the bottom of the capacitor element and the stop pin; the filling paperboards are arranged on the periphery of the U-shaped supporting plate and fixed through oil-resistant adhesive tapes, and the cross sections of the filling paperboards are in a step shape.

Specifically, the capacitor element is formed by winding a polypropylene film, capacitor paper and an aluminum foil.

Furthermore, the top metal flange is clamped on the outer side of the upper end cover, the top metal flange and the insulating sleeve are locked through threads, sealant is smeared between the top metal flange and the upper end cover, sealant is also smeared between the top metal flange and the insulating sleeve, and a first sealing ring is arranged between the upper end cover and the end face of the insulating sleeve.

Furthermore, the bottom metal flange is clamped on the outer side of the lower end cover, the bottom metal flange and the insulating sleeve are locked through threads, sealant is smeared between the bottom metal flange and the lower end cover, sealant is also smeared between the bottom metal flange and the insulating sleeve, and a second sealing ring is arranged between the lower end cover and the end face of the insulating sleeve.

Further, a third sealing ring is arranged between the top sealing cover and the bottom of the first threaded hole.

Further, the bottom sealing cover comprises a transverse portion and a vertical portion, the transverse portion is fixed below the vertical portion, and fourth sealing rings are arranged between the side wall and the end face of the transverse portion and the lower end cover.

The invention has the beneficial effects that: the voltage-sharing capacitor is compact in structure and good in sealing performance and insulating performance, two threaded inflation holes with different specifications are formed in the upper end cover of the capacitor, one-way inflation is realized through the inflation tool, and after inflation is finished, the threaded sealing plug is screwed down to compress the sealing gasket under the condition that the inflation tool is not detached, so that the inflation holes are sealed, and the air tightness of the whole capacitor is guaranteed; this condenser still has transportation convenience, reliable advantage, and the mode of adopting the packing cardboard around the electric capacity component combines the blotter that sets up between electric capacity component subassembly and the expander cover simultaneously, can bear the operation or great mechanical vibration and impact load in the transportation, ensures that the product capacitance is stable.

Drawings

In order to more clearly illustrate the technical solution of the present invention, the drawings needed for the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings without creative efforts.

Fig. 1 is a structural sectional view of a voltage-sharing capacitor of the present invention;

fig. 2 is a schematic structural view of a capacitive element assembly of the voltage-sharing capacitor of the present invention;

fig. 3 is a sectional view of a capacitive element assembly of the voltage sharing capacitor of the present invention.

In the figure: 1-insulating sleeve, 2-expander, 3-capacitor element assembly, 4-upper end cap, 5-top metal flange, 6-sealant, 7-first sealing ring, 8-top gas filling hole, 9-top sealing cap, 10-third sealing ring, 11-thread sealing plug, 12-sealing gasket, 13-lower end cap, 14-bottom metal flange, 15-second sealing ring, 16-bottom oil filling hole, 17-bottom sealing cap, 17 a-transverse part, 17 b-vertical part, 18-fourth sealing ring, 19-expander cap, 20-buffer pad, 31-capacitor element, 32-filling paper board, 33-oil resistant tape, 34-gasket, 35-stop pin, 36-U-shaped support plate.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the specification, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

In a specific embodiment of the present invention, as shown in fig. 1 to 3, the present invention specifically discloses a voltage-sharing capacitor, which includes an insulating sleeve 1, an expander 2 and a capacitance element assembly 3, wherein the expander 2 and the capacitance element assembly 3 are arranged in the sleeve 1, an upper end cap 4 is arranged at a top end of the insulating sleeve 1, the upper end cap 4 and the insulating sleeve 1 are compressed by a top metal flange 5, the top metal flange 5 is clamped at an outer side of the upper end cap 4, the top metal flange 5 and the insulating sleeve 1 are locked by a thread and are coated with a sealant 6, the sealant 6 is coated between the top metal flange 5 and the upper end cap 4, and a first sealing ring 7 is arranged between the upper end cap 4 and an end surface of the insulating sleeve 1.

The upper end cover is provided with a top inflation hole 8, the top inflation hole 8 is a stepped threaded hole and comprises a first threaded hole and a second threaded hole, a top sealing cover 9 is arranged in the first threaded hole, and a third sealing ring 10 is arranged between the top sealing cover 9 and the bottom of the first threaded hole. A threaded sealing plug 11 is arranged in the second threaded hole, and sealing gaskets 12 are arranged at the bottoms of the threaded sealing plug 11 and the second threaded hole; the expander is placed the sealed lid 9 of top in first threaded hole before aerifing, places threaded sealing plug 11 and sealed pad 12 in the second threaded hole, aerifys the completion back, under the condition that aerifys the frock and does not dismantle, screws up threaded sealing plug 11 compression sealed pad 12 to the realization realizes one-way inflation to the sealed of aerifing the hole, guarantees the gas tightness.

A lower end cover 13 is arranged at the bottom end of the insulating sleeve 1, and the lower end cover 13 is fixed with the insulating sleeve 1 through a bottom metal flange 14; the bottom metal flange 14 is clamped on the outer side of the lower end cover 13, the bottom metal flange 14 and the insulating sleeve 1 are locked through threads and coated with sealant 6, the sealant 6 is coated between the bottom metal flange 14 and the lower end cover 13, and a second sealing ring 15 is arranged between the lower end cover 13 and the end face of the insulating sleeve 1.

The lower end cover 13 is provided with a bottom oil filling hole 16 for filling and supplementing oil, a bottom sealing cover 17 is arranged in the bottom oil filling hole 16, the bottom sealing cover 17 comprises a transverse portion 17a and a vertical portion 17b, the transverse portion 17a is fixed below the vertical portion 17b, and fourth sealing rings 18 are arranged between the side wall and the end face of the transverse portion 17a and the lower end cover 13.

The top metal flange 5 and the bottom metal flange 14 fix the upper end cap 4, the lower end cap 13 and the insulating sleeve 8 to form a sealed space. After the product is assembled, sealant is coated on the joint surfaces of the upper end cover 4, the top metal flange 5, the lower end cover 13 and the bottom metal flange 14, so that excellent sealing performance of the product is ensured, and loose matching among parts can be prevented.

The expander 2 is arranged above the capacitor element assembly 3, the expander 2 and the upper end cover 4 are welded into a whole, the expander 2 is a built-in corrugated expander and is used for compensating volume change of capacitor oil along with temperature change and preventing negative pressure from existing in a product, an expander cover 19 is arranged outside the expander 2, the expander cover 19 and the upper end cover 4 are welded and fixed, and the expander cover not only has the function of limiting the working space of the expander 2, but also has the function of tightly propping against the capacitor element assembly 3;

the capacitor element assembly 3 is placed on the lower end cover 13, two ends of the capacitor element assembly 3 are led out by leads, the lead at one end is connected with the expander cover 19, and the lead at the other end is connected with the lower end cover 13.

A buffer pad 20 is arranged between the expander cover 19 and the capacitor element assembly 3, the top of the buffer pad 20 is tightly attached to the expander cover 19, the bottom of the buffer pad 20 presses the capacitor element assembly 3 to form axial fixation of the capacitor element assembly 3, and the buffer pad 20 is also used for absorbing impact and vibration loads received in the processes of product transportation and circulation, so that the capacitance of the product is ensured.

The capacitor element assembly 3 comprises a capacitor element 31 and a filling paper board 32, the capacitor element assembly 3 comprises a plurality of capacitor elements 31, the filling paper board 32 and a U-shaped supporting plate 36 which are connected in series, the U-shaped supporting plate 36 is inverted on the lower end cover 13, the capacitor element 31 is arranged in the U-shaped supporting plate 36, a stop pin 35 is arranged at the bottom of the U-shaped supporting plate 36, two ends of the stop pin 35 are fixed on the U-shaped supporting plate 36, a gasket 34 is arranged between the top of the capacitor element 31 and the U-shaped supporting plate 36, and a gasket 34 is also arranged between the bottom of the capacitor element 31 and the stop pin 35; the aluminum sheet containing the lead is wound on the gasket 34, then the aluminum sheet is overlapped with the tail end of one of the two aluminum foil plates of the capacitor element 31 which is not welded with the adjacent element and then is connected by spot welding, the other end of the lead on the aluminum sheet on the gasket 34 at the top of the capacitor element is connected with the expander cover 19, and the other end of the lead on the aluminum sheet on the gasket 34 at the bottom of the capacitor element is connected with the lower end cover 13.

The filling paperboard is arranged on the periphery of the U-shaped supporting plate and fixed through the oil-resistant adhesive tape, the cross section of the filling paperboard is in a step shape, the filling paperboard is adopted to enable the capacitor element to be fully impregnated, the insulating property of the product is good, the heat dissipation performance is good, the phenomenon that the temperature rise is too high in the using process is avoided, and the service life of the product is prolonged.

The capacitor element is formed by winding a polypropylene film, capacitor paper and an aluminum foil, and has good insulating property. The capacitor element assembly is formed by connecting a plurality of capacitor elements in series, the capacitor elements are electrically connected in an aluminum foil end-to-end lap joint welding mode, and the elements with proper quantity are fixed by using paperboards around the elements after being connected in series, so that the capacitor element assembly can bear larger mechanical vibration and impact load in operation or transportation, and the capacitance stability of products is ensured.

The working principle of the voltage-sharing capacitor is as follows: the capacitor is connected in parallel at two ends of the fracture of the alternating current circuit breaker by utilizing the principles of capacitance voltage division and capacitor energy storage, so that the effect of charging the fracture is achieved, and the voltage balance between the fractures is achieved. Meanwhile, the characteristic that the capacitive voltage element cannot jump is utilized, and the amplitude of the recovery voltage can be effectively controlled in the switch-off process.

While the foregoing is directed to the preferred embodiment of the present invention, it will be understood by those skilled in the art that various changes and modifications may be made without departing from the spirit and scope of the invention.