CN118039389A - Arc extinguishing device of circuit breaker - Google Patents

Abstract

The invention provides an arc extinguishing device of a circuit breaker, comprising: the arc-extinguishing chamber body comprises a first arc-extinguishing chamber and a second arc-extinguishing chamber which are adjacently arranged in the arc-extinguishing chamber body at intervals; the arc extinguishing assembly comprises a first arc extinguishing sheet cluster which is arranged in a first arc extinguishing cavity and is formed in a semi-surrounding structure and faces the arc extinguishing chamber body opening, and a second arc extinguishing sheet cluster which is arranged in a second arc extinguishing cavity and is formed in a semi-surrounding structure and faces the arc extinguishing chamber body opening, wherein an arc guiding structure connected between the first arc extinguishing sheet cluster and the second arc extinguishing sheet cluster is arranged between the first arc extinguishing cavity and the second arc extinguishing cavity, and the number of arc extinguishing grid sheets can be greatly increased by the arc extinguishing device, so that the effect of effective arc extinguishing is achieved.

Description

Arc extinguishing device of circuit breaker

Technical Field

The invention relates to the technical field of circuit breakers, in particular to an arc extinguishing device of a circuit breaker.

Background

The main function of the low-voltage circuit breaker arc extinguishing system is to extinguish the arc generated by the contact when the circuit is cut off, and the common arc extinguishing system adopts a duplex structure of arc extinguishing grid plates which are arranged in parallel and radially: the arc that produces when the contact divides disconnected, by drawing back promptly by the steel bars piece, quench rapidly under the strong cooling effect of bars piece and short arc effect, in the prior art, the arc extinguishing bars piece is along explosion chamber length direction interval arrangement in proper order, because current explosion chamber space is limited, the explosion piece occupation space of this kind of traditional overall arrangement is again big, can set up the explosion piece quantity less, the arc extinguishing effect of explosion chamber is not good, lead to the electric arc unable to be extinguished completely, thereby the condition of arcing appears, consequently, technical staff need optimize the overall arrangement improvement to traditional explosion chamber, in order to obtain better arc extinguishing effect.

Disclosure of Invention

Therefore, the technical problem to be solved by the invention is to overcome the defect that the arc cannot be completely extinguished due to the limited space of the arc extinguishing chamber and the limited number of the arc extinguishing bars in the arc extinguishing chamber in the prior art, thereby providing the arc extinguishing chamber of the circuit breaker, which can greatly increase the number of the arc extinguishing bars.

To this end, the present invention provides a circuit breaker arc extinguishing device comprising: the arc-extinguishing chamber body comprises a first arc-extinguishing chamber and a second arc-extinguishing chamber which are adjacently arranged in the arc-extinguishing chamber body at intervals; the arc extinguishing assembly comprises a first arc extinguishing sheet cluster which is arranged in a first arc extinguishing cavity and is formed in a semi-surrounding structure and faces the opening of the arc extinguishing chamber body, and a second arc extinguishing sheet cluster which is arranged in a second arc extinguishing cavity and is formed in a semi-surrounding structure and faces the opening of the arc extinguishing chamber body, wherein an arc guiding structure connected between the first arc extinguishing sheet cluster and the second arc extinguishing sheet cluster is arranged between the first arc extinguishing cavity and the second arc extinguishing cavity.

Further: the first arc extinguishing sheet cluster comprises first vertical grid sheet groups which are arranged at the inner end of the first arc extinguishing cavity at intervals along the length direction of the arc extinguishing chamber body, and first inclined grid sheet groups and second inclined grid sheet groups which are arranged at two sides of the first arc extinguishing cavity at intervals along the width direction of the arc extinguishing chamber body, wherein the first vertical grid sheet groups, the first inclined grid sheet groups and the second inclined grid sheet groups are arranged in a U shape in the first arc extinguishing cavity; the second arc extinguishing sheet clusters comprise second vertical grid sheet groups which are arranged at the inner end of the second arc extinguishing cavity along the length direction of the arc extinguishing chamber body at intervals, and third inclined grid sheet groups and fourth inclined grid sheet groups which are arranged at two sides of the second arc extinguishing cavity along the width direction of the arc extinguishing chamber body at intervals, wherein the second vertical grid sheet groups, the third inclined grid sheet groups and the fourth inclined grid sheet groups are arranged in a U shape in the second arc extinguishing cavity.

Further: the first arc extinguishing piece cluster is including setting up first arc striking structure of first arc extinguishing chamber opening part, first arc striking structure extends to on the outer wall of first arc extinguishing chamber, first arc striking structure is used for attracting the electric arc on the stationary contact to in the first arc extinguishing chamber, the second arc extinguishing piece cluster is including setting up second arc striking structure of second arc extinguishing chamber opening part, second arc striking structure is used for attracting the electric arc on the movable contact to in the second arc extinguishing chamber.

Further: the gas production device is characterized in that a partition plate for separating the first arc-extinguishing cavity from the second arc-extinguishing cavity is arranged in the arc-extinguishing chamber body, sealing plates are arranged on one sides, opposite to the partition plate, of the first arc-extinguishing cavity and the second arc-extinguishing cavity respectively, a gas production cover is arranged on the opening side of the arc-extinguishing chamber body, and the gas production cover is connected with the first arc-extinguishing cavity and the second arc-extinguishing cavity respectively to form a plurality of gas production channels.

Further: an insulating partition plate used for preventing the contact assembly from being electrified with the first equipotential grid plate is arranged below the first equipotential grid plate.

Further: the arc guiding structure is a first equipotential grid sheet, the first equipotential grid sheet is connected below the second inclined grid sheet group and the third inclined grid sheet group in a V structure and is parallel to the second inclined grid sheet group and the third inclined grid sheet group respectively, and the first inclined grid sheet group, the second inclined grid sheet group, the third inclined grid sheet group and the fourth inclined grid sheet group are inclined at a certain angle.

Further: third equipotential grid plates are respectively arranged between the first inclined grid plate group and the first vertical grid plate group, and fourth equipotential grid plates are respectively arranged between the third inclined grid plate group and the second vertical grid plate group.

Further: the first inclined grid plate group and the second inclined grid plate group are obliquely downwards arranged from two sides of the first vertical grid plate group to the middle of the first vertical grid plate group, and the third inclined grid plate group and the fourth inclined grid plate group are obliquely downwards arranged from two sides of the second vertical grid plate group to the middle of the second vertical grid plate group.

Further: the contact assembly comprises a fixed contact arranged on a circuit breaker shell and a moving contact which swings in the circuit breaker shell to contact or separate from the fixed contact, the first arc striking structure is a second equipotential grid sheet, an arc inlet for an electric arc to enter the first inclined grid sheet group is formed between the second equipotential grid sheet and a sealing plate, an arc channel for the electric arc generated by separating the fixed contact from the moving contact to pass through is arranged on the gas generating cover, the arc channel is arranged above the fixed contact, the sealing plate is arranged above the arc channel, the arc inlet is arranged on the sealing plate, the second equipotential grid sheet comprises a connecting end and a guiding end, the connecting end and the guiding end are arranged in a bending structure, and the guiding end penetrates through the arc inlet and is parallel to the first inclined grid sheet group.

Further: the gas production cover comprises a first extending component positioned between a first inclined grid sheet group and a second extending component positioned between a third inclined grid sheet group and a fourth inclined grid sheet group, wherein the first extending component extends to the lower end of the first vertical grid sheet group, the second extending component extends to the lower end of the second vertical grid sheet group, an arc groove for enabling an arc to enter for cutting the arc is formed in each of the first arc extinguishing sheet cluster and the second arc extinguishing sheet cluster, the arc groove comprises a first guide groove, second guide grooves and third matching grooves, the cross sections of the first guide grooves are arc-shaped, the second guide grooves are positioned on two sides of the first guide groove, the third matching grooves are positioned on two sides of the second guide groove, and the cross sections of the second guide grooves are rectangular, and are used for being clamped with the first extending component or the second extending component.

Further: the first extension subassembly is including the first gas production portion and the second gas production portion of relative setting, be formed with the first passageway that the gas passed through between first gas production portion and the second gas production portion, first gas production portion and second gas production portion are including being the first fender muscle and the second fender muscle that "T" type structure set up, the second extension subassembly is including the third gas production portion and the fourth gas production portion of relative setting, and third gas production portion and fourth gas production portion are formed with the second passageway that the gas passed through, third gas production portion and fourth gas production portion are including being the third fender muscle and the fourth fender muscle that "T" type structure set up, first fender muscle is located the third cooperation inslot of first slope grid group and second slope grid group, the second fender muscle is located the third cooperation inslot of third slope grid group and fourth slope grid group, the third fender muscle is located the third cooperation inslot of third slope grid group and fourth slope grid group, the fourth is located between third slope grid group and the fourth slope grid group.

Further: the gas production cover is internally provided with an iron block and a containing groove for containing the iron block, and an arc-shaped surface for avoiding the moving contact is arranged below the gas production cover.

The technical scheme of the invention has the following advantages:

1. According to the arc-extinguishing device of the circuit breaker, the first arc-extinguishing cavity and the second arc-extinguishing cavity are formed in the arc-extinguishing cavity in a separated mode, the first arc-extinguishing cavity and the second arc-extinguishing cavity are internally provided with the plurality of arc-extinguishing grid pieces, most of arc-extinguishing cavities in the prior art are provided with only one arc-extinguishing cavity, even the arc-extinguishing cavity with double arc-extinguishing functions is provided with the inner arc-extinguishing grid pieces which are arranged up and down, because the space in the arc-extinguishing cavity is limited, only about 30 arc-extinguishing grid pieces can be contained at most, sufficient arc extinguishing cannot be achieved, in the embodiment, the arc-extinguishing cavity is divided into the left arc-extinguishing cavity and the right arc-extinguishing cavity, the first arc-extinguishing grid pieces and the second arc-extinguishing grid pieces are arranged in a semi-surrounding structure, and the arc-guiding structure is connected between the first arc-extinguishing grid pieces and the second arc-extinguishing grid pieces, so that the total number of the first arc-extinguishing cavity and the second arc-extinguishing cavity can contain more than twice of the current arc-extinguishing cavity can be achieved, and therefore the arc-extinguishing path can be prolonged, and the cutting of the grid pieces can be cut through the two cavities by so much.

2. According to the arc extinguishing device of the circuit breaker, the first equipotential grating sheet is arranged at the position below the middle of the first arc extinguishing cavity and the second arc extinguishing cavity, and the electric arc in the first arc extinguishing cavity can be guided into the second arc extinguishing cavity through the arrangement of the first equipotential grating sheet, so that the electric arc can move along an M-shaped path after the electric arc is generated.

3. According to the arc extinguishing device of the circuit breaker, after the contact assembly is opened, an arc is generated, after the arc is generated, the gas generating cover forms arc blowing gas at high temperature, and as the through hole is formed in the top of the arc extinguishing chamber, the arc blowing gas drives the arc to move towards one end close to the arc extinguishing chamber.

4. According to the arc extinguishing device of the circuit breaker, a plurality of spaces for the arc blowing gas to pass through are formed between the gas generating cover and the first arc extinguishing chamber and between the gas generating cover and the second arc extinguishing chamber, when the arc blowing gas is generated, the arc blowing gas moves upwards along the channel, and therefore an arc is brought to a deeper position of the arc extinguishing grid sheet.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings that are needed in the description of the embodiments or the prior art will be briefly described, and it is obvious that the drawings in the description below are some embodiments of the present invention, and other drawings can be obtained according to the drawings without inventive effort for a person skilled in the art.

Fig. 1 is a schematic view of the overall structure of the inside of a circuit breaker;

Fig. 2 is an enlarged view of a portion a in fig. 1;

FIG. 3 is a diagram showing the connection structure of the arc extinguishing chamber and the gas generating cover;

FIG. 4 is a diagram of the positional relationship between the gas generating cap and the arc chute sheet;

fig. 5 is a schematic structural view of an arc extinguishing gate.

Reference numerals illustrate:

10. A circuit breaker housing; 101. a stationary contact; 102. a moving contact; 1. an arc extinguishing chamber body; 11. a first arc extinguishing chamber; 12. a second arc extinguishing chamber; 13. a gas production channel; 14. an arc path; 15. an arc inlet; 16. a second equipotential gate sheet; 17. a connection end; 18. a leading end; 2. a partition plate; 3. arc extinguishing grid plate component; 30. a second arc striking structure; 301. a first arc chute cluster; 3011. a first set of sloped gate sheets; 3012. a second set of inclined grid plates; 3013. a first vertical grid set; 302. a second arc chute cluster; 3021. a third inclined grid set; 3022. a fourth set of inclined grid plates; 3023. a second set of vertical gate sheets; 31. arc extinguishing grid plates; 32. an arc tank; 322. a first guide groove; 323. a second guide groove; 324. a third mating groove; 33. a third equipotential grid; 34. a fourth equipotential grid; 4. a first equipotential gate sheet; 5. a gas producing cover; 51. a first extension assembly; 511. a first gas generating section; 512. a second gas generating section; 513. a first channel; 52. a second extension assembly; 521. a third gas generating section; 522. a fourth gas generating section; 523. a second channel; 53. a first rib; 54. a second blocking rib; 55. a third rib; 56. fourth blocking ribs; 6. a sealing plate; 7. iron blocks; 71. a receiving groove; 72. an arc surface; 8. an insulating separator.

Detailed Description

The following description of the embodiments of the present invention will be made apparent and fully in view of the accompanying drawings, in which some, but not all embodiments of the invention are shown. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.

In the description of the present invention, it should be noted that the directions or positional relationships indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. are based on the directions or positional relationships shown in the drawings, are merely for convenience of describing the present invention and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.

In the description of the present invention, it should be noted that, unless explicitly specified and limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be either fixedly connected, detachably connected, or integrally connected, for example; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the present invention will be understood in specific cases by those of ordinary skill in the art.

In addition, the technical features of the different embodiments of the present invention described below may be combined with each other as long as they do not collide with each other.

Examples

The embodiment provides a circuit breaker arc extinguishing device, including: the arc extinguishing chamber body 1 comprises a first arc extinguishing chamber 11 and a second arc extinguishing chamber 12 which are adjacently arranged in the arc extinguishing chamber body at intervals; the arc extinguishing assembly comprises a first arc extinguishing sheet cluster 301 which is arranged in a first arc extinguishing cavity 11 in a semi-surrounding structure and formed and surrounds the opening towards the arc extinguishing chamber body 1, and a second arc extinguishing sheet cluster 302 which is arranged in a second arc extinguishing cavity 12 in a semi-surrounding structure and formed and surrounds the opening towards the arc extinguishing chamber body 1, wherein an arc guiding structure connected between the first arc extinguishing sheet cluster 301 and the second arc extinguishing sheet cluster 302 is arranged between the first arc extinguishing cavity 11 and the second arc extinguishing cavity 12.

The specific improvement is as follows: as shown in fig. 1 and 2, the arc extinguishing body includes a first arc extinguishing chamber 11 and a second arc extinguishing chamber 12 that are adjacently disposed, a first arc extinguishing plate cluster 301 is disposed in the first arc extinguishing chamber 11, a second arc extinguishing plate cluster 302 is disposed in the second arc extinguishing chamber 12, openings of the first arc extinguishing plate cluster 301 and the second arc extinguishing plate cluster 302 face down, and an arc guiding structure that guides an arc in the first arc extinguishing plate cluster 301 to the second arc extinguishing plate cluster 302 is connected between the first arc extinguishing plate cluster 301 and the second arc extinguishing plate cluster 302, and by the arrangement of the first arc extinguishing plate cluster 301, the second arc extinguishing plate cluster 302 and the arc guiding structure, the number of arc extinguishing grid plates 31 can be greatly increased on the basis that the size of the arc extinguishing chamber 1 is the same as that of a circuit breaker in the prior art, when a product is manufactured, the die opening and the test are not required, and the cost can be effectively saved), so that a sufficient effect (for example, the arc extinguishing chamber in the prior art can be provided with 30-40 arc extinguishing plates and 60-70 of the embodiment can be provided).

Based on the above embodiments: the first arc extinguishing sheet cluster 301 comprises a first vertical grid sheet group 3013 arranged at intervals at the inner end of the first arc extinguishing chamber 11 along the length direction of the arc extinguishing chamber body 1, and a first inclined grid sheet group 3011 and a second inclined grid sheet group 3012 arranged at intervals at two sides of the first arc extinguishing chamber 11 along the width direction of the arc extinguishing chamber body 1, wherein the first vertical grid sheet group 3013, the first inclined grid sheet group 3011 and the second inclined grid sheet group 3012 are arranged in a U shape in the first arc extinguishing chamber 11; the second arc extinguishing sheet cluster 302 includes a second vertical grid sheet group 3023 disposed at an inner end of the second arc extinguishing chamber 12 at intervals along a length direction of the arc extinguishing chamber body 1, and a third inclined grid sheet group 3021 and a fourth inclined grid sheet group 3022 disposed at both sides of the second arc extinguishing chamber 12 at intervals along a width direction of the arc extinguishing chamber body 1, and the second vertical grid sheet group 3023, the third inclined grid sheet group (3021) and the fourth inclined grid sheet group 3022 are arranged in a U shape in the second arc extinguishing chamber 12.

The specific improvement is as follows: as shown in fig. 2 and 3, after the arc is generated, the arc enters the first inclined grid group 3011, then sequentially passes through the first vertical grid group 3013, the second inclined grid group 3012, and the first equipotential grid 4 to reach the third inclined grid group 3021, the second vertical grid group 3023, and finally passes through the fourth inclined grid group 3022, so that the whole arc extinguishing process is completed, the first inclined grid group 3011, the second inclined grid group 3012, and the first vertical grid group 3013 are arranged in an "n" type structure, and the third inclined grid group 3021, the fourth inclined grid group 3022, and the second vertical grid group 3023 are arranged in an "n" type structure, and are connected by adopting an arc guiding structure, so that an "M" type path is formed.

Based on the above embodiments: the first arc extinguishing piece cluster 301 comprises a first arc striking structure arranged at the opening of the first arc extinguishing cavity 11, the first arc striking structure extends to the outer wall of the first arc extinguishing cavity 11, the first arc striking structure is used for attracting the arc on the fixed contact 101 into the first arc extinguishing cavity 11, the second arc extinguishing piece cluster 302 comprises a second arc striking structure 30 arranged at the opening of the second arc extinguishing cavity 12, and the second arc striking structure 30 is used for attracting the arc on the moving contact 102 into the second arc extinguishing cavity 12.

The specific improvement is as follows: as shown in fig. 1 and fig. 2, after the fixed contact 101 and the moving contact 102 are separated, part of the electric arc extends to the outer wall of the first arc extinguishing chamber 11 along the first arc striking structure and then enters the first inclined grid group 3011 in the first arc extinguishing cluster 301, so that a predetermined path is cut, and part of the electric arc also enters the fourth inclined grid group 3022 in the second arc extinguishing cluster 302 along the second arc striking structure 30 and then is conducted to the second vertical grid group 3023, the third inclined grid group 3021, the second inclined grid group 3012 and the first vertical grid group 3013 and finally is conducted to the first inclined grid group 3011 (generally, the electric arc is cut in the middle path).

Based on the above embodiments: the explosion chamber body 1 is internally provided with a separation plate 2 for separating the first explosion chamber 11 from the second explosion chamber 12, the first explosion chamber 11 and the second explosion chamber 12 are respectively provided with a sealing plate 6 on one side opposite to the separation plate 2, the opening side of the explosion chamber body 1 is provided with a gas generating cover 5, and the gas generating cover 5 is respectively connected with the first explosion chamber 11 and the second explosion chamber 12 to form a plurality of gas generating channels 13.

The specific improvement is as follows: as shown in fig. 3, the specific improvement is as follows: as shown in fig. 2, the first arc-extinguishing sheet cluster 301 is located in the first arc-extinguishing chamber 11, the second arc-extinguishing sheet cluster 302 is located in the second arc-extinguishing chamber 12, the first arc-extinguishing sheet cluster 301 and the second arc-extinguishing sheet cluster 302 are all arranged in an n-shaped structure, the first arc-extinguishing sheet cluster 301 and the second arc-extinguishing sheet cluster 302 are connected by adopting the first equipotential grid 4, the two first arc-extinguishing sheet clusters 301 and the second arc-extinguishing sheet cluster 302 which are arranged in the n-shaped structure are connected into an M-shaped structure, the inner side wall of the arc-extinguishing chamber 1, namely, the opposite side of the first arc-extinguishing sheet cluster 301 and the second arc-extinguishing sheet cluster 302 to the arc-extinguishing chamber 1, is provided with a sealing plate 6, because the lower parts of the first arc-extinguishing sheet cluster 301 and the second arc-extinguishing sheet cluster 302 are in a sealing structure, the side edges are provided with sealing plates 6 to form a sealing, so that the arc-extinguishing gas generated by the gas-generating cover 5 can only move to the upper part of the arc-extinguishing chamber 1, through the arrangement of the sealing plate 6, the air tightness of the first arc extinguishing chamber 11 and the second arc extinguishing chamber 12 can be enhanced, the arc blowing gas is prevented from overflowing, the arc can enter the arc extinguishing chamber 1, four gas producing channels 13 are arranged in total, 2 gas producing channels are formed between the gas producing cover 5 and the first arc extinguishing chamber 11 and the second arc extinguishing chamber 12, the specific positions are written below, the arc can be produced by the contact assembly in the opening process, the high temperature can be formed in the circuit breaker due to the production of the arc, the gas producing cover 5 is arranged below the arc extinguishing gate sheet 31, the gas producing cover 5 is wrapped outside the contact assembly, that is to say, the contact assembly is positioned in the gas producing cover 5, after the high temperature is formed by the arc produced by the contact assembly after opening, the arc producing cover 5 can produce the arc blowing gas in the high temperature environment, the gas generating cover 5 is respectively connected with the first arc extinguishing chamber 11 and the first arc extinguishing chamber 11 to form a plurality of gas generating channels 13 (the positions of the specific gas generating channels 13 are written below), and as the through holes (which are in the prior art) are formed above the arc extinguishing chamber 1, the fixed contact and the moving contact are of a sealing structure, so that the space below the contact assembly is a sealed space, gas can move towards the direction provided with the through holes, and the gas generated by the gas generating cover 55 can move upwards, so that an electric arc is brought to the position deeper than the arc extinguishing chamber 11, and an effective cutting electric arc is realized.

Based on the above embodiments: an insulating partition 8 for preventing the contact assembly from being electrified with the first equipotential grid sheet 4 is arranged below the arc guiding structure.

The specific improvement is as follows: as shown in fig. 3, the insulating partition 8 is disposed below the arc guiding structure, the insulating partition 8 is disposed above the contact assembly, after the contact assembly is opened, the electric arc is prevented from directly entering the second arc extinguishing chamber 12 through the arc guiding structure, if the electric arc directly enters the second arc extinguishing chamber 12, the electric arc does not skip the arc extinguishing gate sheets 31 in the first arc extinguishing chamber 11 any more, the arc extinguishing path is in an n-shaped trend, and only about 30 arc extinguishing gate sheets 31 passing through the electric arc are required to be cut completely, so that the effect of full arc extinguishing cannot be achieved, and therefore, the electric arc can only enter from the arc inlet 15 through the insulating partition 8, and then enter the second arc extinguishing chamber 12 through the first arc extinguishing chamber 11, so that the electric arc is cut according to the M path.

Based on the above embodiments: the arc guiding structure is a first equipotential grid sheet 4, the first equipotential grid sheet 4 is connected below the second inclined grid sheet group 3012 and the third inclined grid sheet group 3021 in a V-shaped structure and is parallel to the second inclined grid sheet group 3012 and the third inclined grid sheet group 3021 respectively, and the first inclined grid sheet group 3011, the second inclined grid sheet group 3012, the third inclined grid sheet group 3021 and the fourth inclined grid sheet group 3022 are inclined at a certain angle.

The specific improvement is as follows: the first inclined grid set 3011, the second inclined grid set 3012, the third inclined grid set 3021 and the fourth inclined grid set 3022 are all inclined at 0-90 degrees, after an arc is generated, the arc is led to the arc groove 32 of the first inclined grid set 3011 through the second equipotential grid 16 after the arc is generated, then sequentially passes through the first vertical grid set 3013, the second inclined grid set 3012, and reaches the third inclined grid set 3021, the second vertical grid set 3023 and finally passes through the fourth inclined grid set 3022, so that the whole arc extinguishing process is completed, and the position where the arc is collected is at the arc groove 32 of the arc extinguishing grid 31.

Based on the above embodiments: the sides of the first inclined grid set 3011 and the second inclined grid set 3012 opposite to the first vertical grid set 3013 are respectively provided with a third equipotential grid 33, and the second sides of the third inclined grid set 3021 and the fourth inclined grid set 3022 opposite to the second vertical grid set 3023 are respectively provided with a fourth equipotential grid 34.

The specific improvement is as follows: the third equipotential grating 33 is arranged on two sides of the first vertical grating 3013 (two sides are respectively arranged on two sides of the first inclined grating 3011 and the second inclined grating 3012), the electric arc on the first inclined grating 3011 can be guided to the first vertical grating 3013 through the arrangement of the third equipotential grating 33, then the electric arc on the first vertical grating 3013 is guided to the second inclined grating 3012, so that the electric arc can move along an n-shaped structure, the electric arc on the third inclined grating 3021 can be guided to the second vertical grating 3023 through the arrangement of the fourth equipotential grating 34, finally the electric arc is guided to the fourth inclined grating 3022, 4 gas producing channels 13 are arranged in the first arc extinguishing chamber 11 and the second arc extinguishing chamber 12, the first channel is positioned between the first inclined grating 3011 and the sealing plate 6, the second channel is positioned between the second inclined grating 3012 and the third inclined grating 3022, and the fourth channel is positioned between the fourth inclined grating 3022 and the fourth channel, and the fourth channel is more fully blown and is positioned between the fourth channel and the fourth channel 3022, and the fourth channel is more fully blown and the fourth channel is formed between the fourth channel and the sealing plate 3022.

Based on the above embodiments: the first inclined grid plate group 3011 and the second inclined grid plate group 3012 are arranged obliquely downwards from two sides of the first vertical grid plate group 3013 to the middle of the first vertical grid plate group 3013, and the third inclined grid plate group 3021 and the fourth inclined grid plate group 3022 are arranged obliquely downwards from two sides of the second vertical grid plate group 3023 to the middle of the second vertical grid plate group 3023.

The specific improvement is as follows: as shown in fig. 3, the top of the arc extinguishing chamber 1 is provided with a vent hole, so that gas in the cavity of the arc extinguishing chamber 1 can flow towards the vent hole at the top of the arc extinguishing chamber 1, and the inclined airflow of the grid plate can move upwards along the grid plate, so that the electric arc is brought to a deeper part of the grid plate, the cooling of the electric arc is accelerated, and the recovery strength of a medium is enhanced.

Based on the above embodiments: the circuit breaker comprises a circuit breaker shell 10, a contact assembly comprises a fixed contact 101 positioned on the circuit breaker shell 10 and a moving contact 102 swinging in the circuit breaker shell 10 to realize opening and closing with the fixed contact 101, an arc channel 14 for an arc generated after the fixed contact 101 and the moving contact 102 are separated from each other is formed between the gas generating cover 5 and the circuit breaker shell 10, the arc channel 14 is positioned above the fixed contact 101, a sealing plate 6 is positioned above the arc channel 14, an arc inlet 15 is positioned on the sealing plate 6, a second equipotential grid 16 for guiding the arc into the first inclined grid set 3011 is connected in the arc inlet 15, the second equipotential grid 16 comprises a connecting end 17 and a guiding end 18, the connecting end 17 and the guiding end 18 are arranged in a bending structure, and the guiding end 18 passes through the arc inlet 15 and is parallel to the first inclined grid set 3011.

The specific improvement is as follows: the fixed contact 101 is located on the circuit breaker housing 10, when the moving contact 102 and the fixed contact 101 are separated, an arc is generated between the moving contact and the fixed contact, the arc reaches the arc inlet 15 through the arc channel 14, and is guided into the first inclined grid plate group 3011 through the second equipotential grid plate 16, and then the arc is cut along an 'M' -shaped track.

Based on the above embodiments: the gas generating cover 5 comprises a first extending component 51 positioned between the first inclined grid plate group 3011 and the second inclined grid plate group 3012 and a second extending component 52 positioned between the third inclined grid plate group 3021 and the fourth inclined grid plate group 3022, the first extending component 51 extends to the lower end of the first vertical grid plate group 3013, the second extending component 52 extends to the lower end of the second vertical grid plate group 3023, the arc groove 32 comprises a first guiding groove 322 with an arc-shaped cross section, second guiding grooves 323 positioned at two sides of the first guiding groove 322 and third matching grooves 324 positioned at two sides of the second guiding groove 323, the cross section of the second guiding groove 323 is rectangular, and the third matching grooves 324 are used for being clamped with the first extending component 51 or the second extending component 52.

The specific improvement is as follows: as shown in fig. 3, the gas generating cover 5 is provided with a first extension component 51 and a second extension component 52, the first extension component 51 is inserted in the first arc extinguishing chamber 11 and is inserted between the first inclined grid plate group 3011 and the second inclined grid plate group 3012, and the second extension component 52 is positioned in the second arc extinguishing chamber 12 and is inserted between the third inclined grid plate group 3021 and the fourth inclined grid plate group 3022, so that when the moving contact 102 and the fixed contact 101 are separated, an arc is generated, the first extension component 51 and the second extension component 52 generate arc blowing gas, the arc blowing gas moves towards one side of the vent hole, and the arc is driven to enter a deeper position in the moving process of the arc blowing gas.

Based on the above embodiments: the first extension assembly 51 includes a first gas generating portion 511 and a second gas generating portion 512 that are oppositely disposed, a first channel 513 through which gas passes is formed between the first gas generating portion 511 and the second gas generating portion 512, the first gas generating portion 511 and the second gas generating portion 512 include a first rib 53 and a second rib 54 that are disposed in a T-shaped structure, the second extension assembly 52 includes a third gas generating portion 521 and a fourth gas generating portion 522 that are oppositely disposed, the third gas generating portion 521 and the fourth gas generating portion 522 form a second channel 523 through which gas passes, the third gas generating portion 521 and the fourth gas generating portion 522 include a third rib 55 and a fourth rib 56 that are disposed in a T-shaped structure, the first rib 53 is located in a third fitting groove 324 of the first inclined grid group 3011 and the second inclined grid group 3012, the second rib 54 is located between the first inclined grid group 3011 and the second inclined grid group 3022, the third rib 30255 and the fourth rib 56 are located in the third fitting groove 324 of the third inclined grid group 3011 and the fourth inclined grid group 3012.

The specific improvement is as follows: as shown in fig. 4, the first extension assembly 51 includes a first gas generating portion 511 and a second gas generating portion 512, the structures of the first gas generating portion 511 and the second gas generating portion 512 are identical, the first gas generating portion 511 and the second gas generating portion 512 are composed of a first rib 53 and a second rib 54, which form a T-shaped structure, the two first ribs 53 are oppositely arranged, a first channel 513 with a spacing of 12mm is formed in the middle, and similarly, two fourth ribs 56 are oppositely arranged, a second channel 523 with a spacing of 12mm is formed in the middle, (i.e., 2 gas generating channels are formed between the gas generating cover 5 and the first arc extinguishing chamber 11 and the second arc extinguishing chamber 12 mentioned above) the first channel 513 and the second channel 523 are used for the passage of the arc blowing gas, and the two second ribs 54 and the two fourth ribs 56 which are oppositely arranged are inserted into the third matching groove 324, so that the space of the first channel 513 and the second channel 523 is reduced, the space of the first channel 513 and the second channel 523 is smaller, and the space of the space inside the first channel 513 and the second channel 523 is smaller is the space of the inner is bigger, and the gas pressure of the arc blowing gas is larger, and the effective and the arc blowing gas pressure is increased.

Based on the above embodiments: the gas production cover 5 is internally provided with an iron block 7 and a containing groove 71 for containing the iron block 7, and an arc-shaped surface 72 for avoiding the moving contact 102 is arranged below the gas production cover 5.

The specific improvement is as follows: as shown in fig. 3 and 4, the first gas generating part 511 and the third gas generating part 521, and the second gas generating part 512 and the fourth gas generating part 522 form a gas generating unit, and an iron block 7 is respectively provided in the middle of the two gas generating units, and by arranging the two iron blocks 7 opposite to each other, magnetism in the middle of the two iron blocks 7 can be enhanced, and arcs can be gathered together, so that the whole gas generating unit is conveniently attracted into the arc channel 14.

It is apparent that the above examples are given by way of illustration only and are not limiting of the embodiments. Other variations or modifications of the above teachings will be apparent to those of ordinary skill in the art. It is not necessary here nor is it exhaustive of all embodiments. While still being apparent from variations or modifications that may be made by those skilled in the art are within the scope of the invention.

Claims (12)

1. An arc extinguishing device of a circuit breaker, which is characterized in that: comprising the following steps:

the arc extinguishing chamber body (1) comprises a first arc extinguishing chamber (11) and a second arc extinguishing chamber (12) which are adjacently arranged in the arc extinguishing chamber body at intervals;

The arc extinguishing assembly comprises a first arc extinguishing sheet cluster (301) which is arranged in a first arc extinguishing cavity (11) and is formed by a semi-surrounding structure and surrounds an opening towards an arc extinguishing chamber body (1), and a second arc extinguishing sheet cluster (302) which is arranged in a second arc extinguishing cavity (12) and is formed by a semi-surrounding structure and surrounds an opening towards an arc extinguishing chamber body (1), wherein an arc guiding structure connected between the first arc extinguishing sheet cluster (301) and the second arc extinguishing sheet cluster (302) is arranged between the first arc extinguishing cavity (11) and the second arc extinguishing cavity (12).

2. The circuit breaker arc extinguishing device of claim 1, wherein: the first arc extinguishing sheet cluster (301) comprises first vertical grid sheet groups (3013) which are arranged at the inner end of the first arc extinguishing cavity (11) at intervals along the length direction of the arc extinguishing chamber body (1), and first inclined grid sheet groups (3011) and second inclined grid sheet groups (3012) which are arranged at intervals on two sides of the first arc extinguishing cavity (11) along the width direction of the arc extinguishing chamber body (1), wherein the first vertical grid sheet groups (3013), the first inclined grid sheet groups (3011) and the second inclined grid sheet groups (3012) are arranged in a U shape in the first arc extinguishing cavity (11); the second arc extinguishing sheet cluster (302) comprises a second vertical grid sheet group (3023) which is arranged at the inner end of the second arc extinguishing cavity (12) along the length direction of the arc extinguishing chamber body (1) at intervals, and a third inclined grid sheet group (3021) and a fourth inclined grid sheet group (3022) which are arranged at the two sides of the second arc extinguishing cavity (12) along the width direction of the arc extinguishing chamber body (1) at intervals, wherein the second vertical grid sheet group (3023), the third inclined grid sheet group (3021) and the fourth inclined grid sheet group (3022) are arranged in a U shape in the second arc extinguishing cavity (12).

3. The circuit breaker arc extinguishing device of claim 2, wherein: the first arc extinguishing sheet cluster (301) comprises a first arc striking structure arranged at the opening of the first arc extinguishing cavity (11), the first arc striking structure extends to the outer wall of the first arc extinguishing cavity (11), and the first arc striking structure is used for attracting the arc on the fixed contact (101) into the first arc extinguishing cavity (11); the second arc extinguishing sheet cluster (302) comprises a second arc striking structure (30) arranged at the opening of the second arc extinguishing cavity (12), and the second arc striking structure (30) is used for attracting the electric arc on the moving contact (102) into the second arc extinguishing cavity (12).

4. A circuit breaker arc extinguishing apparatus according to claim 3, characterized in that: the explosion chamber body (1) is including separating division board (2) with first explosion chamber (11) and second explosion chamber (12), and constitutes the outer wall of first explosion chamber (11) and second explosion chamber (12) and two closing plates (6) relative with division board (2), gas production cover (5) are installed to the opening side of explosion chamber body (1), gas production cover (5) link to each other with first explosion chamber (11) and second explosion chamber (12) respectively and form many gas production passageway (13).

5. The circuit breaker arc extinguishing device of claim 1, wherein: an insulating partition plate (8) used for preventing the contact assembly from being electrified with the first equipotential grid sheet (4) is arranged below the arc guide structure.

6. The circuit breaker arc extinguishing device of claim 4 wherein: the arc guiding structure is a first equipotential grid sheet (4), the first equipotential grid sheet (4) is connected below a second inclined grid sheet group (3012) and a third inclined grid sheet group (3021) in a V structure and is parallel to the second inclined grid sheet group (3012) and the third inclined grid sheet group (3021) respectively, and the first inclined grid sheet group (3011), the second inclined grid sheet group (3012), the third inclined grid sheet group (3021) and the fourth inclined grid sheet group (3022) are inclined at a certain angle.

7. The circuit breaker arc extinguishing device of claim 6 wherein: third equipotential grid plates (33) are respectively arranged between the first inclined grid plate group (3011) and the second inclined grid plate group (3012) and the first vertical grid plate group (3013), and fourth equipotential grid plates (34) are respectively arranged between the third inclined grid plate group (3021) and the fourth inclined grid plate group (3022) and the second vertical grid plate group (3023).

8. The circuit breaker arc extinguishing device of claim 7 wherein: the first inclined grid plate group (3011) and the second inclined grid plate group (3012) are obliquely downwards arranged from two sides of the first vertical grid plate group (3013) to the middle of the first vertical grid plate group (3013), and the third inclined grid plate group (3021) and the fourth inclined grid plate group (3022) are obliquely downwards arranged from two sides of the second vertical grid plate group (3023) to the middle of the second vertical grid plate group (3023).

9. The circuit breaker arc chute of claim 8 wherein: the first arc striking structure is a second equipotential grid sheet (16), an arc inlet (15) for enabling a power supply arc to enter a first inclined grid sheet group (3011) is formed between the second equipotential grid sheet (16) and a sealing plate (6), an arc channel (14) for enabling an arc generated by separating a fixed contact (101) from a movable contact (102) to pass through is arranged on a gas generating cover (5), the arc channel (14) is located above the fixed contact (101), the sealing plate (6) is located above the arc channel (14) and the arc inlet (15) is located on the sealing plate (6), the second equipotential grid sheet (16) comprises a connecting end (17) and a guide end (18), the connecting end and the connecting end are arranged in a bent structure, and the guide end (18) penetrates through the arc inlet (15) to be parallel to the first inclined grid sheet group (3011).

10. The circuit breaker arc extinguishing device of claim 9 wherein: the gas generating cover (5) comprises a first extending component (51) located between a first inclined grid plate group (3011) and a second inclined grid plate group (3012) and a second extending component (52) located between a third inclined grid plate group (3021) and a fourth inclined grid plate group (3022), the first extending component (51) extends to the lower end of the first vertical grid plate group (3013), the second extending component (52) extends to the lower end of the second vertical grid plate group (3023), arc grooves (32) for feeding arcs into the first arc extinguishing plate clusters (301) and the second arc extinguishing plate clusters (302) are formed in the arc grooves for cutting arcs, each arc groove (32) comprises a first guiding groove (322) with an arc-shaped cross section, second guiding grooves (323) located on two sides of each first guiding groove (322) and third matching grooves (324) located on two sides of each second guiding groove (323), each second matching groove (323) is rectangular in cross section, and each third matching groove (324) is used for being connected with each first extending component (51) or each second extending component (52).

11. The circuit breaker arc chute of claim 10 wherein: the first extension component (51) comprises a first gas generating part (511) and a second gas generating part (512) which are oppositely arranged, a first channel (513) through which gas passes is formed between the first gas generating part (511) and the second gas generating part (512), the first gas generating part (511) and the second gas generating part (512) comprise a first baffle rib (53) and a second baffle rib (54) which are arranged in a T-shaped structure, the second extension component (52) comprises a third gas generating part (521) and a fourth gas generating part (522) which are oppositely arranged, the third gas generating part (521) and the fourth gas generating part (522) form a second channel (523) through which gas passes, the third gas generating part (521) and the fourth gas generating part (522) comprise a third baffle rib (55) and a fourth baffle rib (56) which are arranged in a T-shaped structure, the first baffle rib (53) is positioned in a first inclined grid plate group (1) and a second inclined grid plate (3012), the third baffle rib (3012) is positioned in the third inclined grid plate (3011) and the third baffle rib (3012) which is matched with the third baffle rib (324), the fourth blocking rib (56) is positioned between the third inclined grid plate group (3021) and the fourth inclined grid plate group (3022).

12. The circuit breaker arc extinguishing device of claim 4 wherein: an iron block (7) and a containing groove (71) for containing the iron block (7) are arranged in the gas production cover (5), and an arc-shaped surface (72) for avoiding the moving contact (102) is arranged below the gas production cover (5).