阅读说明：本技术 一种新型高压sf6自能助吹式断路器灭弧室 (Novel high-pressure SF6Self-energy blowing-assistant type circuit breaker arc extinguish chamber ) 是由 林莘 张博 徐建源 谭盛武 钟建英 段晓辉 庚振新 林一泓 宋宇 魏登峰 张佳 于 2021-09-14 设计创作，主要内容包括：本发明提供一种新型高压SF-(6)自能助吹式断路器灭弧室,涉及输变电设备技术领域。该新型高压SF-(6)自能助吹式断路器灭弧室,在现有灭弧室结构的基础上,将大喷口、小喷口、静弧触头和单向阀修改为带有喉部凸起的大喷口和改进的小喷口结构、空心结构的静弧触头以及带有弹簧定位珠的单向阀；大喷口喉部设置多个波纹状凸起,减小大喷口与静弧触头间的缝隙；带有弹簧定珠位的单向阀在膨胀室与压气缸通道中设置多个弹簧定位珠,加长单向阀长度,并在单向阀开槽,使单向阀闭合后弹簧定位珠滑进单向阀开槽处锁住单向阀,从而防止单向阀闭合后打开。该灭弧室增大了电弧能量的利用率,提升了触头前端电弧弧根的吹弧效果,增强了断路器熄弧能力。(The invention provides a novel high-voltage SF 6 Self-energy blowing-assisting type circuit breaker arc extinguish chamber relates to the technical field of power transmission and transformation equipment. The novel high-pressure SF 6 A self-energy blowing-assisted circuit breaker arc extinguish chamber is characterized in that a large nozzle, a small nozzle, a static arc contact and a one-way valve are modified into a large nozzle with a throat bulge, an improved small nozzle structure, a static arc contact with a hollow structure and a one-way valve with a spring positioning ball on the basis of the existing arc extinguish chamber structure; the throat part of the large nozzle is provided with a plurality of corrugated bulges so as to reduce the gap between the large nozzle and the static arc contact; the one-way valve with spring positioning ball is characterized by that several spring positioning balls are placed in the channels of expansion chamber and air-pressing cylinder, the length of said one-way valve is extended, and said one-way valve is openedAnd the groove enables the spring positioning ball to slide into the grooving part of the one-way valve to lock the one-way valve after the one-way valve is closed, so that the one-way valve is prevented from being opened after being closed. The arc extinguishing chamber increases the utilization rate of arc energy, improves the arc blowing effect of the arc root at the front end of the contact, and enhances the arc extinguishing capability of the circuit breaker.)

1. Novel high-pressure SF₆From ability blow-assisted circuit breaker explosion chamber, its characterized in that: based on the existing arc extinguish chamber structure, a large nozzle, a small nozzle,The static arc contact and the one-way valve are modified into a large nozzle with a throat bulge, an improved small nozzle structure, a static arc contact with a hollow structure and a one-way valve with a spring positioning ball; the throat part of the large nozzle is provided with a plurality of corrugated bulges so as to reduce a gap between the large nozzle and the static arc contact; the check valve with the spring positioning ball positions is characterized in that a plurality of spring positioning balls are arranged in passages of the expansion chamber and the air compression cylinder, the length of the check valve is lengthened, and a groove is formed in the check valve, so that the spring positioning balls slide into the groove of the check valve to lock the check valve after the check valve is closed, and the check valve is prevented from being opened after being closed.

2. Novel high voltage SF according to claim 1₆From ability blow-assisted circuit breaker explosion chamber, its characterized in that: the improved small nozzle structure cuts off the perforated part of the original small nozzle structure, so that the size of the small nozzle is reduced, and the gap between the nozzle and the small nozzle is increased.

3. Novel high voltage SF according to claim 2₆From ability blow-assisted circuit breaker explosion chamber, its characterized in that: the size of the gap between the large nozzle and the small nozzle is determined according to the requirement of an actual circuit breaker.

4. Novel high voltage SF according to claim 1₆From ability blow-assisted circuit breaker explosion chamber, its characterized in that: the number and the size of the large-nozzle throat corrugated bulges are determined according to the requirements of an actual circuit breaker.

5. Novel high voltage SF according to claim 1₆From ability blow-assisted circuit breaker explosion chamber, its characterized in that: the length of the aperture radius of the static arc contact is determined according to the requirement of an actual circuit breaker.

6. Novel high voltage SF according to claim 1₆From ability blow-assisted circuit breaker explosion chamber, its characterized in that: the length, the height and the slotting dimension of the valve plate structure of the one-way valve are determined according to the requirements of an actual circuit breaker.

7. Novel high voltage SF according to claim 1₆From ability blow-assisted circuit breaker explosion chamber, its characterized in that: the spring positioning ball comprises a spring and a steel ball connected with the spring, and the height, the diameter and the spring elastic coefficient of the spring positioning ball are determined according to the requirements of an actual circuit breaker.

8. Novel high voltage SF according to claim 7₆From ability blow-assisted circuit breaker explosion chamber, its characterized in that: the number of the spring positioning beads is determined according to actual requirements.

9. Novel high voltage SF according to claim 8₆From ability blow-assisted circuit breaker explosion chamber, its characterized in that: the spring positioning balls are uniformly distributed in the expansion chamber and the air cylinder channel.

Technical Field

The invention relates to the technical field of power transmission and transformation equipment, in particular to a novel high-voltage SF₆Self-energy blowing-assistant type circuit breaker arc extinguish chamber.

Background

Compressed SF₆The circuit breaker has a leading position in the market of high-voltage switches due to excellent breaking performance and insulation performance. Because the pneumatic circuit breaker needs the cylinder to continuously apply work to the gas in the cylinder in the switching-on and switching-off process, particularly for extra-high voltage switch equipment, a high-power operating mechanism needs to be equipped to complete the switching-on and switching-off task, and the high-voltage switch equipment is switched on and offHigher requirements are put on the reliability of the equipment. And SF₆The self-powered circuit breaker can make up for the deficiency by virtue of the advantages of small volume, low operation power and the like. High pressure SF₆The self-energy circuit breaker is used for breaking short-circuit current by utilizing self energy of electric arc, when the circuit breaker receives a brake opening instruction, each component of the circuit breaker moves under the action of an operating mechanism, gas in a gas cylinder is compressed, and the pressure is increased; when the moving contacts are separated, the electric arc is stably combusted under the action of large current, the pressure between the contacts is higher than that of the expansion chamber under the high-temperature environment generated by the electric arc, and hot gas enters the expansion chamber under the action of pressure difference to enable the one-way valve to move, so that the pressure in the expansion chamber is increased; when the current gradually approaches and reaches a zero crossing point, the energy of the electric arc is reduced, the pressure between the contacts is smaller than that of the expansion chamber, high-pressure and high-temperature gas in the expansion chamber flows out to blow the arc, the temperature of the electric arc is continuously reduced, and the electric arc is extinguished; when small current is cut off, the energy of the electric arc is insufficient to close the one-way valve, and the air in the air cylinder is mainly compressed to blow the arc, so that the electric arc is extinguished.

However, the self-energy circuit breaker still has the risk of breaking failure when breaking current, and the influence factors of the breaking failure are many, such as small arc-blowing area at a nozzle, slow energy dissipation, poor heat dissipation between contacts, influence of pressure building in an expansion chamber due to valve shake, further influence of gas flow speed during arc blowing and the like, which may cause high temperature after arc between the contacts, influence of medium recovery speed, further thermal or electrical breakdown after arc, further arc reignition, breaking failure, and reduction of SF₆The reliability of the self-energy breaker for breaking the short-circuit current.

Disclosure of Invention

The technical problem to be solved by the present invention is to provide a novel high voltage SF for overcoming the defects of the prior art₆Self-energy blowing-assistant type arc extinguishing chamber of circuit breaker for improving SF₆The reliability of the self-energy breaker for breaking the short-circuit current.

In order to solve the technical problems, the technical scheme adopted by the invention is as follows: novel high-pressure SF₆A self-energy blowing-assistant type arc extinguish chamber of a circuit breaker is characterized in that a large nozzle, a small nozzle, a static arc contact and a one-way valve are modified into a structure with a throat part bulge on the basis of the existing arc extinguish chamber structureThe large nozzle, the improved small nozzle structure, the static arc contact of the hollow structure and the one-way valve with the spring positioning ball; the throat part of the large nozzle is provided with a plurality of corrugated bulges so as to reduce a gap between the large nozzle and the static arc contact; the check valve with the spring positioning ball positions is characterized in that a plurality of spring positioning balls are arranged in passages of the expansion chamber and the air compression cylinder, the length of the check valve is lengthened, and a groove is formed in the check valve, so that the spring positioning balls slide into the groove of the check valve to lock the check valve after the check valve is closed, and the check valve is prevented from being opened after being closed.

Preferably, the improved small nozzle structure cuts off the perforated part of the original small nozzle structure, so that the size of the small nozzle is reduced, and the gap between the nozzle and the small nozzle is increased.

Preferably, the size of the gap between the large nozzle and the small nozzle is determined according to the requirement of an actual circuit breaker.

Preferably, the number and the size of the corrugated bulges of the throat part of the large nozzle are determined according to the requirements of an actual circuit breaker.

Preferably, the length of the aperture radius of the static arc contact is determined according to the requirements of an actual circuit breaker.

Preferably, the length, height and slot size of the one-way valve plate structure are determined according to the requirements of an actual circuit breaker.

Preferably, the spring positioning ball comprises a spring and a steel ball connected with the spring, and the height, the diameter and the spring elastic coefficient of the spring positioning ball are determined according to the requirements of an actual circuit breaker.

Preferably, the number of the spring positioning beads is determined according to actual requirements.

Preferably, the plurality of spring location beads are evenly arranged within the expansion chamber and the puffer cylinder channel.

The invention relates to a novel high-voltage SF₆The working principle of the arc extinguish chamber of the self-energy blowing-assisted circuit breaker is as follows: through the big spout with the throat bulge and the improved small spout structure, the gap between the spout and the small spout is increased, when electric arc burns, more hot gas enters the expansion chamber, the utilization rate of electric arc energy is increased, and meanwhile, the corrugated bulge is added at the throat of the big spout, so that the contact between the big spout and a static arc is reducedIn the arc blocking stage, more arc energy can enter the expansion chamber, so that the pressure in the expansion chamber can be built, and the arc blowing capacity can be improved; the static arc contact with a hollow structure enhances the heat dissipation between the contacts; when the low current is switched on and off, because the electric arc energy is low, the arcing time is short, mainly the gas in the air cylinder is compressed to blow the arc, the hollow arc contact is more favorable for discharging hot gas in an arc area, and the medium recovery capability is improved; when the heavy current is switched on and off, hot gas in an arc area is discharged through the static arc contact of the hollow structure, so that the pressure intensity of the arc area is reduced, the blowing speed of a nozzle is increased, and arc extinguishing is facilitated; the one-way valve with spring ball positioning solves the problem that the pressure of the expansion chamber is influenced by the fact that the one-way valve cannot be completely closed under the action of gas on two sides of the expansion chamber and the pressure chamber, and the electric arc breaking failure is caused₆The self-energy circuit breaker is capable of being switched on and off, and the operational reliability of the system is improved.

Adopt the produced beneficial effect of above-mentioned technical scheme to lie in: the invention provides a novel high-voltage SF₆The self-energy blowing-assisted circuit breaker arc extinguish chamber increases the gap between the large nozzle and the small nozzle, so that the utilization rate of arc energy can be improved, and more hot gas enters the expansion chamber under the action of pressure difference; after the throat part of the nozzle is designed into the corrugated bulge and the anti-shake one-way valve, the one-way valve can be closed, the opening condition of the one-way valve is improved, and the pressure in the expansion chamber can be better established; through the static arc contact of hollow structure, can be more discharge arc district steam when the arc blowing, promoted the arc blowing effect of contact front end electric arc root, strengthened the ability of putting out the arc of circuit breaker.

Drawings

FIG. 1 shows a novel high-voltage SF according to an embodiment of the present invention₆The structure schematic diagram of the arc extinguish chamber of the self-energy blowing-assisted circuit breaker;

FIG. 2 is a schematic structural diagram of a large nozzle with a throat bulge provided by an embodiment of the invention;

FIG. 3 is a schematic structural diagram of an improved small nozzle provided by the embodiment of the invention;

FIG. 4 is a schematic diagram of a stationary arcing contact having a hollow structure provided by an embodiment of the present invention;

FIG. 5 is a schematic structural diagram of a valve plate of the one-way valve provided by the embodiment of the invention;

fig. 6 is a schematic diagram of the structure of the expansion chamber and the air cylinder channel according to the embodiment of the present invention.

In the figure: 1. SF₆A gas region; 2. a static main contact 3 and a movable main contact; 4. an expansion chamber; 5. a one-way valve; 6. a pneumatic cylinder; 7. a shield case; 8. a large spout; 9. a small nozzle; 10. a moving arc contact; 11. a stationary arc contact; 12. a spring-loaded bead.

Detailed Description

The following detailed description of embodiments of the present invention is provided in connection with the accompanying drawings and examples. The following examples are intended to illustrate the invention but are not intended to limit the scope of the invention.

In this example, high pressure SF₆The arc extinguish chamber of the self-energy blowing-assisted circuit breaker is shown in figure 1 and comprises SF₆The device comprises a gas area 1, a static main contact 2, a dynamic main contact 3, an expansion chamber 4, a one-way valve 5, a pressure cylinder 6, a shielding cover 7, a large nozzle 8, a small nozzle 9, a dynamic arc contact 10 and a static arc contact; the invention relates to a novel high-voltage SF₆On the basis of the existing arc extinguish chamber structure, a large nozzle, a small nozzle, a static arc contact and a one-way valve are modified into the large nozzle with a throat bulge as shown in figure 2, the improved small nozzle structure as shown in figure 3, the static arc contact with a hollow structure as shown in figure 4 and the one-way valve with a spring positioning bead 12 as shown in figure 5; the throat part of the large nozzle is provided with a plurality of corrugated bulges so as to reduce the gap between the large nozzle and the static arc contact; the improved small nozzle structure reduces the size of the small nozzle by the hole part of the original small nozzle structure so as to increase the gap between the nozzle and the small nozzle; one-way valve with spring positioning balls multiple spring positioning balls are arranged in the passage of expansion chamber and air cylinder as shown in figure 6, the length of the one-way valve is lengthened, the one-way valve is grooved, the spring positioning balls slide into the groove of the one-way valve to lock the one-way valve after the one-way valve is closed, and then the one-way valve is lockedAnd prevent the opening of the check valve after closing; the size of a gap between the large nozzle and the small nozzle is determined according to the requirement of an actual circuit breaker; the number and the size of the corrugated bulges at the throat part of the large nozzle are determined according to the requirements of an actual circuit breaker. The length of the radius of the opening of the static arc contact of the hollow structure is determined according to the requirement of an actual circuit breaker; the length, the height and the slotting size of the valve plate structure of the one-way valve are determined according to the requirements of an actual circuit breaker; the spring positioning balls comprise springs and steel balls connected with the springs, and the height, the diameter, the spring elastic coefficient and the number of the spring positioning balls are determined according to the requirements of the actual circuit breaker; the plurality of spring positioning beads should be evenly distributed in the expansion chamber and the air cylinder channel.

The invention relates to a novel high-voltage SF₆The working principle of the arc extinguish chamber of the self-energy blowing-assisted circuit breaker is as follows: the gap between the nozzle and the small nozzle is increased through the large nozzle with the throat part bulge and the improved small nozzle structure, when electric arc burns, more hot gas enters the expansion chamber, the utilization rate of electric arc energy is increased, meanwhile, the corrugated bulge is added at the throat part of the large nozzle, the gap between the large nozzle and the static arc contact is reduced, and in the electric arc blocking stage, more electric arc energy can enter the expansion chamber, so that the pressure intensity in the expansion chamber is favorably established, and the arc blowing capacity is improved; the static arc contact with a hollow structure enhances the heat dissipation between the contacts; when the low current is switched on and off, because the electric arc energy is low, the arcing time is short, mainly the gas in the air cylinder is compressed to blow the arc, and the static arc contact with the hollow structure is more favorable for discharging hot gas in an arc area, thereby improving the medium recovery capability; when the heavy current is switched on and off, hot gas in an arc area is discharged through the static arc contact of the hollow structure, so that the pressure intensity of the arc area is reduced, the blowing speed of a nozzle is increased, and arc extinguishing is facilitated; the one-way valve with the spring positioning balls solves the problem that the pressure of the expansion chamber is influenced to be established because the one-way valve cannot be completely closed under the action of gas on two sides of the expansion chamber and the pressure chamber, so that the electric arc is failed to be cut off₆Self-energy breaker breaking capacity and reliable work for improving system operationAnd (4) sex.

SF₆When the self-energy circuit breaker is used for breaking short circuit and low current, the electric arc capacity is low, the one-way valve is not closed enough, the air is compressed by the air compression cylinder to blow the arc, and the static arc contact with the hollow structure can better discharge high-temperature air, so that the recovery capacity is improved; SF₆When the self-powered circuit breaker is used for breaking a short circuit and heavy current, the pressure intensity between contacts is higher than that of an expansion chamber under the high-temperature environment generated by electric arc, hot gas enters the expansion chamber under the action of pressure difference, and due to the fact that gaps between a large nozzle and a small nozzle are enlarged, more hot gas enters the expansion chamber, and because the throat part of the large nozzle is designed into a corrugated bulge, the gas can be well suppressed in the nozzle blocking stage, the pressure in the expansion chamber is better built, the pressure intensity of the expansion chamber is increased, a one-way valve moves, and a spring positioning bead in a passage of the expansion chamber and a pressure cylinder slides into a one-way valve groove to fix the one-way valve; as shown in fig. 1, the force-bearing area of the check valve on the expansion chamber side is larger than that on the air cylinder side, and simultaneously, under the action of the spring positioning ball, after the check valve is closed, the air cylinder needs higher pressure to open the check valve, so that the check valve is prevented from shaking under the pressure on two sides and cannot be completely closed; when the current gradually approaches and reaches the zero crossing point, the arc energy is reduced, the pressure between the contacts is smaller than that of the expansion chamber, high-pressure fluid flows out of the expansion chamber to blow the arc, hot gas in an arc area is discharged through the hollow arc contact, the medium recovery capability of the arc area is improved, and the arc quenching capability of the circuit breaker is enhanced.

Finally, it should be noted that: the above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; such modifications and substitutions do not depart from the spirit of the corresponding technical solutions and scope of the present invention as defined in the appended claims.