阅读说明：本技术 一种配电系统用断路器 (Circuit breaker for power distribution system ) 是由 崔子召 于 2021-07-30 设计创作，主要内容包括：本发明涉及电力技术领域,且公开了一种配电系统用断路器,包括绝缘瓷套,所述绝缘瓷套内固定套接有气密绝缘外壳,所述绝缘瓷套的两侧开设有活动腔,所述气密绝缘外壳的顶端固定连接有定端盖板,所述定端盖板的中心固定套接有定导电杆,所述定导电杆的底端固定连接有定触头,所述定导电杆的顶部固定连接有对称的分流定导电杆。本发明通过设计的分流定导电杆、分流动导电杆、灭弧板、切割块,使断路器在进行分闸时,其震动产生的应力一部分转化为切割块的转动动力,使切割块在灭弧板之间弹动切割电弧,从而削弱电弧强度,同时减小相邻灭弧板之间的间距,使削弱的电弧单位时间内的弹动次数增大,拉长量增大,从而快速完成灭弧动作。(The invention relates to the technical field of electric power, and discloses a circuit breaker for a power distribution system, which comprises an insulating porcelain bushing, wherein an airtight insulating shell is fixedly sleeved in the insulating porcelain bushing, movable cavities are formed in two sides of the insulating porcelain bushing, a fixed end cover plate is fixedly connected to the top end of the airtight insulating shell, a fixed conducting rod is fixedly sleeved in the center of the fixed end cover plate, a fixed contact is fixedly connected to the bottom end of the fixed conducting rod, and symmetrical shunting fixed conducting rods are fixedly connected to the top of the fixed conducting rod. According to the invention, through the designed shunting fixed conductive rod, shunting movable conductive rod, arc-extinguishing plates and cutting block, when the breaker is opened, part of stress generated by vibration of the breaker is converted into rotation power of the cutting block, so that the cutting block bounces and cuts the arc between the arc-extinguishing plates, the arc intensity is weakened, the distance between adjacent arc-extinguishing plates is reduced, the number of bounces of the weakened arc in unit time is increased, the elongation is increased, and arc extinguishing action is rapidly completed.)

1. The utility model provides a circuit breaker for distribution system, includes insulating insulator (1), its characterized in that: the insulating porcelain sleeve (1) is internally and fixedly sleeved with an airtight insulating shell (2), two sides of the insulating porcelain sleeve (1) are provided with movable cavities (7), the top end of the airtight insulating shell (2) is fixedly connected with a fixed end cover plate (3), the center of the fixed end cover plate (3) is fixedly sleeved with a fixed conducting rod (4), the bottom end of the fixed conducting rod (4) is fixedly connected with a fixed contact (5), the top of the fixed conducting rod (4) is fixedly connected with symmetrical shunting fixed conducting rods (6), one end of the shunting fixed conducting rod (6) departing from the fixed conducting rod (4) is fixedly connected with a fixed auxiliary contact (601), the bottom end of the airtight insulating shell (2) is fixedly connected with a movable end cover plate (8), the center of the movable end cover plate (8) is fixedly sleeved with a movable conducting rod (9), and the bottom of the movable conducting rod (9) is wound with a spring (17), the movable contact is fixedly connected to the top end of the movable conducting rod (9), the corrugated pipe (11) is fixedly connected to the top end of the movable end cover plate (8), the symmetrical shunt movable conducting rods (12) are fixedly connected to the middle of the movable conducting rod (9), the top of the shunt movable conducting rod (12) is opposite to one end of the movable conducting rod (9) and is fixedly connected with a movable auxiliary contact (121), and the other end of the shunt movable conducting rod is fixedly connected with an arc extinguishing cover (13).

2. The circuit breaker of claim 1, wherein: the air exists in the arc-extinguishing chamber (13), the arc-extinguishing chamber (13) comprises the arc-extinguishing plates with the same size and uniform distribution, bottom fixedly connected with locating rod (14) between the adjacent arc-extinguishing plates, the middle part of locating rod (14) is articulated with cutting block (15), the articulated end of locating rod (14) and cutting block (15) is T-shaped, the length value of cutting block (15) equals the height value of arc-extinguishing plate.

3. The circuit breaker of claim 1, wherein: the air exists in the arc extinguishing chamber (13), the arc extinguishing chamber (13) comprises the ladder arc extinguishing plates which are arranged in an arithmetic progression, a positioning rod (14) is fixedly connected to the bottom between the adjacent ladder arc extinguishing plates, a cutting block (15) is hinged to the middle of the positioning rod (14), the hinged end of the positioning rod (14) and the hinged end of the cutting block (15) are in a T shape, and the length value of the cutting block (15) is equal to the height value of the highest ladder arc extinguishing plate.

4. The circuit breaker of claim 1, wherein: the insulating porcelain bushing (1) is provided with an inner cavity, and the inner cavity is in a vacuum state.

5. The circuit breaker of claim 1, wherein: the middle part of the movable cavity (7) is fixedly connected with a sealing ring (701).

6. The circuit breaker of claim 1, wherein: the shunt fixed conducting rod (6) penetrates through the airtight insulating shell (2) and the insulating porcelain bushing (1) to the movable cavity (7), and the shunt fixed conducting rod (6) is airtight with the laminating part of the airtight insulating shell (2) and the insulating porcelain bushing (1).

7. The circuit breaker of claim 1, wherein: the branch flow conducting rod (12) is L-shaped, and the vertical section of the branch flow conducting rod (12) is movably sleeved in the movable cavity (7).

Technical Field

The invention relates to the technical field of electric power, in particular to a circuit breaker for a power distribution system.

Background

In a power distribution system, a used circuit safety device is a vacuum circuit breaker which consists of a vacuum arc extinguish chamber, an airtight insulating system (shell), a conductive system, a shielding system, an operating mechanism and other auxiliary components, and the main working principle of the vacuum circuit breaker is that when moving and static contacts in the vacuum arc extinguish chamber are separated under the action of the operating mechanism, electric arcs are generated among the contacts, steam is volatilized from the surfaces of the contacts at high temperature, a magnetic field is generated when current passes through the contacts due to the fact that the contacts are designed to be special shapes, the electric arcs rapidly move along the tangential direction of the surfaces of the contacts under the action of the magnetic field, partial metal steam is condensed on a metal cylinder (shielding cover), the electric arcs are extinguished when the electric arcs naturally pass through zero, the medium strength among the contacts is rapidly recovered, and the process is very rapid.

Although the contact opening distance is small, the contact opening distance of a 10kv vacuum circuit breaker is only about 10mm, the suction force generated by high-voltage current between the contacts is large, the operating mechanism can cause large vibration of an airtight insulating system (shell) in the process of forcibly pulling (combining) moving and static contacts, the internal stress of the airtight insulating system (shell) is increased instantly, the service life of the airtight insulating system (shell) can be shortened, meanwhile, because the moving and static contacts of the vacuum circuit breaker are mostly in a flat plate electrode butt joint mode, the transverse magnetic field and the longitudinal magnetic field of the electrodes can inevitably cause the increase of loop resistance in an arc extinguishing chamber, and the circuit breaker can cause severe temperature rise of the moving and static contacts when high current flows and the brake is opened, and even cause severe cycle to cause oxidation burning loss in severe cases.

Disclosure of Invention

Aiming at the defects of the existing circuit breaker in the use process in the background technology, the invention provides the circuit breaker for the power distribution system, which has the advantages of shunt of a parallel circuit, small stress of opening and opening of a moving contact and a static contact, conversion of partial stress into the elastic force of a cutting body, change of the gap of an arc extinguishing cover by the cutting body and repeated cutting of electric arcs, and solves the problems of larger vibration and serious local temperature rise caused by forced pulling and starting of the static contact in the background technology.

The invention provides the following technical scheme: a circuit breaker for a power distribution system comprises an insulating porcelain bushing, wherein an airtight insulating shell is fixedly sleeved in the insulating porcelain bushing, movable cavities are formed in two sides of the insulating porcelain bushing, a fixed end cover plate is fixedly connected to the top end of the airtight insulating shell, a fixed conducting rod is fixedly sleeved in the center of the fixed end cover plate, a fixed contact is fixedly connected to the bottom end of the fixed conducting rod, symmetrical shunting fixed conducting rods are fixedly connected to the top of the fixed conducting rod, a fixed pair contact is fixedly connected to one end, away from the fixed conducting rod, of the shunting fixed conducting rod, a movable end cover plate is fixedly connected to the bottom end of the airtight insulating shell, a movable conducting rod is fixedly sleeved in the center of the movable end cover plate, a spring is wound at the bottom of the movable conducting rod, a movable contact is fixedly connected to the top end of the movable conducting rod, a corrugated pipe is fixedly connected to the top end of the movable end cover plate, and a symmetrical shunting movable conducting rod is fixedly connected to the middle of the movable conducting rod, one end of the top of the shunt current conducting rod, which is opposite to the shunt current conducting rod, is fixedly connected with a moving pair contact, and the other end of the shunt current conducting rod is fixedly connected with an arc extinguishing cover.

Preferably, there is the air in the arc-extinguishing chamber, the arc-extinguishing chamber comprises the arc-extinguishing plate that the size is the same, the equipartition, bottom fixedly connected with locating lever between the adjacent arc-extinguishing plate, the middle part of locating lever articulates there is the cutting piece, the locating lever is T shape with the hinged end of cutting piece, the length value of cutting piece equals the high value of arc-extinguishing plate.

Preferably, air exists in the arc-extinguishing chamber, the arc-extinguishing chamber is composed of stepped arc-extinguishing plates arranged in an arithmetic progression, a positioning rod is fixedly connected to the bottom between the adjacent stepped arc-extinguishing plates, a cutting block is hinged to the middle of the positioning rod, the hinging end of the positioning rod and the hinging end of the cutting block are in a T shape, and the length value of the cutting block is equal to the height value of the highest stepped arc-extinguishing plate.

Preferably, the insulating porcelain bushing is provided with an inner cavity, and the inner cavity is in a vacuum state.

Preferably, the middle part of the movable cavity is fixedly connected with a sealing ring.

Preferably, the shunting fixing conducting rod penetrates through the airtight insulating shell and the insulating porcelain bushing to the movable cavity, and the laminating position of the shunting fixing conducting rod, the airtight insulating shell and the insulating porcelain bushing is closed.

Preferably, the shunt-moving conducting rod is L-shaped, and the vertical section of the shunt-moving conducting rod is movably sleeved in the movable cavity.

The invention has the following beneficial effects:

1. according to the invention, through the designed shunting fixed conductive rod, shunting movable conductive rod, arc-extinguishing plates and cutting block, when the breaker is opened, part of stress generated by vibration of the breaker is converted into rotation power of the cutting block, so that the cutting block bounces and cuts the arc between the arc-extinguishing plates, the arc intensity is weakened, the distance between adjacent arc-extinguishing plates is reduced, the number of bounces of the weakened arc in unit time is increased, the elongation is increased, and arc extinguishing action is rapidly completed.

2. The invention divides high-voltage current by the designed shunting fixed conductive rod and shunting movable conductive rod, so that the current magnitude when the movable contact and the fixed contact are separated is reduced, the vibration generated by the separation of the movable contact and the fixed contact is reduced, the local temperature rise is prevented from exceeding the standard, meanwhile, when the movable contact and the fixed contact are switched on, the current is divided in one step by the joint connection of the shunting fixed conductive rod and the shunting movable conductive rod, the switching-on impact force of the movable contact and the fixed contact is reduced, a part of internal stress is converted into the elastic power of the cutting block, the internal stress on the whole breaker due to the separation of the switch is reduced, and the damage period of the breaker due to the internal stress is prolonged.

Drawings

FIG. 1 is a schematic structural diagram of an embodiment of the present invention;

FIG. 2 is an enlarged view of a portion of the structure A of FIG. 1 according to the present invention;

figure 3 is a schematic view of an arc chute according to an embodiment of the present invention;

FIG. 4 is a diagram illustrating a state of a cutting block springing according to an embodiment of the present invention;

FIG. 5 is a schematic diagram of the open state of the present invention;

FIG. 6 is a schematic structural diagram according to a second embodiment of the present invention;

FIG. 7 is an enlarged view of a portion of the structure shown at B in FIG. 6 according to the present invention;

figure 8 is a schematic structural view of a second arc chute of an embodiment of the invention;

fig. 9 is a diagram illustrating a state in which the second cutting block bounces according to the embodiment of the present invention.

In the figure: 1. an insulating porcelain bushing; 2. a hermetic insulating housing; 3. fixing end cover plates; 4. fixing a conducting rod; 5. fixing a contact; 6. shunting and fixing the conducting rod; 601. a fixed auxiliary contact; 7. a movable cavity; 701. a seal ring; 8. a movable end cover plate; 9. a movable conductive rod; 10. a moving contact; 11. a bellows; 12. shunting a movable conducting rod; 121. a moving pair contact; 13. an arc extinguishing chamber; 14. positioning a rod; 15. cutting the block; 16. an electric arc; 17. a spring.

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 embodiments of the present invention, 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.

Example one

Referring to fig. 1-5, a circuit breaker for a power distribution system comprises an insulating porcelain bushing 1, the insulating porcelain bushing 1 is provided with an inner cavity, the inner cavity is in a vacuum state, when a moving contact 10 and a fixed contact 5 are switched off, an arc extinguishing function of an electric arc 16 can be completed, an airtight insulating housing 2 is fixedly sleeved in the inner cavity of the insulating porcelain bushing 1, two sides of the insulating porcelain bushing 1 are provided with movable cavities 7, the middle part of each movable cavity 7 is fixedly connected with a sealing ring 701, so that air between arc extinguishing covers 13 can not be transmitted into an internal vacuum environment to cause disappearance of the vacuum state, the top end of the airtight insulating housing 2 is fixedly connected with a fixed end cover plate 3, the center of the fixed end cover plate 3 is fixedly sleeved with a fixed conductive rod 4, the bottom end of the fixed conductive rod 4 is fixedly connected with a fixed contact 5, the top of the fixed conductive rod 4 is fixedly connected with symmetrical shunting fixed conductive rods 6, one end of the shunting fixed conductive rod 6, which deviates from the fixed conductive rod 4, is fixedly connected with a fixed auxiliary contact 601, make the inside parallel circuit that forms of circuit breaker, the electric current volume when making movable contact 10 and fixed contact 5 separating brake reduces, thereby make the vibrations that the two separating brake produced reduce, avoid local temperature rise to exceed standard, simultaneously, when movable contact 10 and fixed contact 5 combined floodgate, divide the laminating of reposition of redundant personnel fixed conducting rod 6, reposition of redundant personnel movable conducting rod 12 and connect and will make the electric current reposition of redundant personnel earlier step, thereby make movable contact 10 and fixed contact 5 combined floodgate impact reduce, reposition of redundant personnel fixed conducting rod 6 runs through airtight insulating housing 2 and insulating porcelain cover 1 to activity chamber 7, reposition of redundant personnel fixed conducting rod 6 and airtight insulating housing 2, the laminating department of insulating porcelain cover 1 is airtight, it can not spread into the vacuum environment of inside to avoid the air between the arc extinguishing chamber 13, lead to the vacuum state disappearance.

The bottom end of the airtight insulating shell 2 is fixedly connected with a movable end cover plate 8, the center of the movable end cover plate 8 is fixedly sleeved with a movable conducting rod 9, the bottom of the movable conducting rod 9 is wound with a spring 17, the top end of the movable conducting rod 9 is fixedly connected with a movable contact 10, the top end of the movable end cover plate 8 is fixedly connected with a corrugated pipe 11, the corrugated pipe 11 is fixedly sleeved on the movable conducting rod 9, the middle part of the movable conducting rod 9 is fixedly connected with symmetrical movable conducting rods 12, so that the movable conducting rod 12 and the shunt fixed conducting rod 6 form two extra short circuits, the movable conducting rod 12 is L-shaped, the vertical section of the movable conducting rod 12 is movably sleeved in the movable cavity 7, the top part of the movable conducting rod 12 is over against one end of the movable conducting rod 9 and is fixedly connected with a movable auxiliary contact 121, so that the movable conducting rod 12 and the shunt fixed conducting rod 6 form two extra circuits in the movable cavity 7, and the other end is fixedly connected with an arc extinguishing cover 13, air exists in the arc extinguishing chamber 13, the air becomes a medium, the electric arc 16 can be flicked and elongated in the arc extinguishing chamber 13, the arc extinguishing chamber 13 is composed of arc extinguishing plates which are the same in size and are uniformly distributed, the electric arc 16 is pulled into the arc extinguishing plates in the arc extinguishing chamber 13 and is flicked continuously between the arc extinguishing plates, the electric arc 16 changes the contact point with each arc extinguishing plate in the moving process, the electric arc is cooled rapidly, the rapid arc extinguishing is completed, a positioning rod 14 is fixedly connected to the bottom between the adjacent arc extinguishing plates, a cutting block 15 is hinged to the middle of the positioning rod 14, the hinging end of the positioning rod 14 and the cutting block 15 is in a T shape, the situation that the position of the cutting block 15 deviates when flicked is avoided, the situation that the position deviates, the cutting block 15 impacts the arc extinguishing plates to cause that two spaces become a space, the arc extinguishing of the electric arc 16 is slowed down, the length value of the cutting block 15 is equal to the height value of the arc extinguishing plates, and the electric arc 16 can be cut by the rapid cutting block 15 when flicked, and the electric arc 16 can impact on the cutting block 15 to complete a plurality of bounces when bounced upwards, so that the situation that the length value of the cutting block 15 is too low, and the electric arc 16 bounces upwards to leave a space formed by the cutting block 15 and an arc extinguishing plate is avoided, the number of bounces is small, and the arc extinguishing time is prolonged.

Example two

Fig. 6 to 9 are schematic structural views of embodiment 2 of the present invention. Here, the same portions as those in embodiment 1 are not described.

The top of the shunt conductive rod 12 is opposite to one end of the movable conductive rod 9, a movable auxiliary contact 121 is fixedly connected, the other end of the shunt conductive rod is fixedly connected with an arc-extinguishing cover 13, air exists in the arc-extinguishing cover 13 and becomes a medium, an electric arc 16 can be flicked and elongated in the arc-extinguishing cover 13, the arc-extinguishing cover 13 is composed of stepped arc-extinguishing plates arranged in an arithmetic progression array, when the electric arc 16 flicks from a short stepped arc-extinguishing plate to a long stepped arc-extinguishing plate, the length of the electric arc 16 is lengthened, the cooling effect is enhanced, the arc-extinguishing capacity is enhanced, a positioning rod 14 is fixedly connected to the bottom between the adjacent stepped arc-extinguishing plates, a cutting block 15 is hinged to the middle part of the positioning rod 14, the situation that the position of the cutting block 15 is deviated when flicked is avoided, the situation that the cutting block 15 collides with the stepped arc-extinguishing plates to cause two spaces to become a space, the arc-extinguishing of the electric arc 16 is slowed down, the hinging end of the positioning rod 14 and the cutting block 15 is in a T shape, the length value of cutting block 15 equals the height value of a highest ladder arc-extinguishing plate, make cutting block 15 can fast cut electric arc 16 when the bullet moves, and make electric arc 16 can strike and accomplish a lot of bounce on cutting block 15 when upwards bouncing, and when getting into the space that next cutting block 15 and ladder arc-extinguishing plate formed downwards, unsmooth shape makes electric arc 16 further elongate, it is low excessively to avoid cutting block 15 length value, lead to electric arc 16 to lengthen the volume too short, the cooling effect is poor, the time of putting out the arc lengthens.

The use method (working principle) of the first embodiment of the invention is as follows:

firstly, when a breaker is switched on, the movable conducting rod 9 is lifted, the corrugated pipe 11 is stretched, the shunt movable conducting rod 12 is lifted and enables the movable auxiliary contact 121 to be attached to the fixed auxiliary contact 601, current is enabled to circulate from the shunt fixed conducting rod 6 and the shunt movable conducting rod 12, the movable conducting rod 9 is continuously lifted at the moment, and finally the movable contact 10 is enabled to impact the fixed contact 5, so that circuits of the fixed conducting rod 4 and the movable conducting rod 9 are communicated, meanwhile, the breaker is enabled to vibrate due to impact, the shunt movable conducting rod 12 is enabled to synchronously vibrate, and the cutting block 15 is enabled to bounce between adjacent arc extinguishing plates around the positioning rod 14;

then, when the circuit breaker is opened, the movable conducting rod 9 moves downwards to separate the movable contact 10 from the fixed contact 5, an elongated arc 16 is generated between the movable contact 10 and the fixed contact 5, the arc 16 is extinguished in the vacuum chamber, meanwhile, the movable conducting rod 12 moves downwards, the joint area between the movable contact 121 and the fixed contact 601 is gradually reduced, at this time, the arc 16 starts to be pulled out between the movable contact 121 and the fixed contact 601, the arc 16 is elongated in the arc extinguishing cover 13, at this time, the circuit breaker vibrates due to the forced separation of the movable contact 10 and the fixed contact 5, the cutting block 15 is bounced between the arc extinguishing plates, the cutting block 15 is enabled to cut the elongated arc 16, at the same time, the space between the adjacent arc extinguishing plates is cut into two spaces, the bounced distance of the cut arc 16 is lengthened, the elongation of the arc 16 in unit time is increased, and the arc extinguishing is completed quickly;

finally, when the moving pair contact 121 is completely separated from the fixed pair contact 601, the circuit is completely disconnected, and the circuit breaker waits for the next closing.

The use method (working principle) of the second embodiment of the invention is as follows:

firstly, when a breaker is switched on, the movable conducting rod 9 is lifted, the corrugated pipe 11 is stretched, the shunt movable conducting rod 12 is lifted and enables the movable auxiliary contact 121 to be attached to the fixed auxiliary contact 601, current is enabled to circulate from the shunt fixed conducting rod 6 and the shunt movable conducting rod 12, the movable conducting rod 9 is continuously lifted at the moment, and finally the movable contact 10 is enabled to impact the fixed contact 5, so that circuits of the fixed conducting rod 4 and the movable conducting rod 9 are communicated, meanwhile, the breaker is enabled to vibrate due to impact, the shunt movable conducting rod 12 is enabled to synchronously vibrate, and the cutting block 15 is enabled to bounce between adjacent step arc extinguishing plates around the positioning rod 14;

then, when the circuit breaker is opened, the movable conducting rod 9 moves downwards to separate the movable contact 10 from the fixed contact 5, an elongated arc 16 is generated between the movable contact 10 and the fixed contact 5, the arc 16 is extinguished in the vacuum cavity, meanwhile, the movable conducting rod 12 moves downwards, the joint area between the movable contact 121 and the fixed contact 601 is gradually reduced, at this time, the arc 16 starts to be pulled out between the movable contact 121 and the fixed contact 601, the arc 16 is elastically elongated in the arc extinguishing cover 13, at this time, the circuit breaker vibrates due to the forced separation of the movable contact 10 and the fixed contact 5, the cutting block 15 is made to bounce between the stepped arc extinguishing plates, the cutting block 15 is made to cut the elongated arc 16, at the same time, the cutting block 15 is made to cut the space between the adjacent stepped arc extinguishing plates into two spaces, the elastic distance of the cut arc 16 is lengthened, so that the elongation of the arc 16 in unit time is increased, and the arc extinguishing is completed quickly;

finally, when the moving pair contact 121 is completely separated from the fixed pair contact 601, the circuit is completely disconnected, and the circuit breaker waits for the next closing.

It is noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus.

Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.