CN115642063A

CN115642063A - Arc extinguishing piece, explosion chamber and circuit breaker

Info

Publication number: CN115642063A
Application number: CN202110813014.5A
Authority: CN
Inventors: 杭陈雨
Original assignee: Individual
Current assignee: Individual
Priority date: 2021-07-19
Filing date: 2021-07-19
Publication date: 2023-01-24

Abstract

The invention provides an arc extinguishing sheet, an arc extinguishing chamber and a circuit breaker, relates to the technical field of low-voltage electric appliances, and mainly aims to provide an accessory capable of efficiently cutting electric arcs and equipment applying the accessory. The arc extinguishing sheet is of a sheet structure, a cutting arc part is arranged on the arc extinguishing sheet, the upper surface and/or the lower surface of the cutting arc part is/are protruded along the thickness direction to form at least one convex block, and the convex block positioned on the upper surface of the cutting arc part and the convex block positioned on the lower surface of the cutting arc part are arranged in a staggered mode; the explosion chamber includes a plurality of above-mentioned arc-extinguishing pieces, all the arc-extinguishing piece is arranged and adjacent two along its thickness direction in proper order there is the clearance between the arc-extinguishing piece. The lug structure on the cutting arc part can properly reduce the distance between the adjacent cutting arc parts on the premise of not changing the electric field and the magnetic field of the arc extinguish chamber, so that the electric arc at the arc extinguish sheet can be effectively cut.

Description

Arc extinguishing piece, explosion chamber and circuit breaker

Technical Field

The invention relates to the technical field of low-voltage electric appliances, in particular to an arc extinguishing sheet, an arc extinguishing chamber and a circuit breaker.

Background

The arc is a form of gas discharge, and when a sufficiently large applied voltage exists between contacts at the moment when a switch is closed or opened, and a circuit current reaches a minimum arcing current, the arc is formed, so that the arc not only has a great destructive effect on the contacts, but also prolongs the time for opening the circuit. Especially, if the circuit fails, the circuit can be damaged and even a fire disaster can happen if the circuit cannot be timely powered off, and the safety of crisis personnel and equipment is ensured, so that the arc extinguish chamber is an important component of the circuit breaker. The arc generated during breaking is eliminated under the action of the arc extinguish chamber, and the breaking performance of the circuit breaker is directly influenced by the strength of the arc extinguish chamber to extinguish the arc. The working principle of the arc extinguish chamber is that electric arcs are introduced into the arc extinguish chamber through the arc ignition block when the electric arcs are generated, and then the electric arcs are eliminated through the arc extinguish sheet of the arc extinguish chamber, as shown in figure 1. Research shows that in the arc extinguishing process, the effective cutting of the arc by the arc extinguishing piece is the key for maintaining the arc to be burnt and extinguished quickly, namely, the cutting efficiency of the arc is the effective guarantee of the breaking capacity of the arc extinguishing piece. The arc extinguishing pieces of the arc extinguishing chamber of the existing circuit breaker adopt an approximately parallel arrangement mode, and whether electric arcs are effectively cut or not can not be guaranteed due to the influence of various factors.

In order to solve the above problems and improve the arc cutting efficiency of the arc extinguishing chamber, a new arc cutting device needs to be developed.

Disclosure of Invention

The invention aims to provide an arc extinguishing sheet, an arc extinguishing chamber and a circuit breaker, and aims to solve the technical problem that the breaking capacity of the circuit breaker in the prior art is insufficient. The technical effects that can be produced by the preferred technical scheme in the technical schemes provided by the invention are described in detail in the following.

In order to achieve the purpose, the invention provides the following technical scheme:

the arc extinguishing sheet provided by the invention is of a sheet-shaped structure, a cutting arc part is arranged on the arc extinguishing sheet, and the upper surface and/or the lower surface of the cutting arc part is/are protruded along the thickness direction of the cutting arc part to form at least one convex block.

Certain gaps are needed among the arc extinguishing sheets to ensure gas circulation, but arc is not easy to generate when the gaps are large, so that the position of the arc is uncertain. The lug structure that is located cutting electric arc portion can suitably reduce the distance between the adjacent cutting electric arc portion under the prerequisite that does not change explosion chamber electric field, magnetic field, has increased the surface area of cutting electric arc portion, not only makes and forms electric arc more easily between two arc extinguishing pieces, also makes the electric arc that is located arc extinguishing piece department simultaneously can effectively be cut to improve its disjunction ability to electric arc. In addition, due to the fact that the bump structure is added, the structural strength of the arc extinguishing piece is further enhanced, and the breaking reliability of the arc extinguishing chamber is finally improved.

On the basis of the technical scheme, the invention can be further improved as follows.

As a further improvement of the present invention, the bump located on the upper surface of the cutting arc portion and the bump located on the lower surface of the cutting arc portion are disposed in a staggered manner.

The staggered lug structures are beneficial to cooling and extinguishing the electric arc, so that the breaking capacity of the electric arc is improved; in addition, the gas circulation and heat dissipation are also facilitated.

As a further improvement of the invention, the lug and the cutting arc part are of an integral structure.

As a further improvement of the invention, the projection is fixedly connected to the cutting arc. The invention provides an arc extinguish chamber, which comprises at least two arc extinguish plates, wherein the number of the arc extinguish plates is at least two; all the arc-extinguishing pieces are sequentially arranged along the thickness direction of the arc-extinguishing pieces, and a gap exists between every two adjacent arc-extinguishing pieces.

Because the clearance of lug position is less than the clearance of this arc-extinguishing piece other positions department, can make in the arc-extinguishing piece form electric arc more easily and effectively cut when using.

As a further improvement of the invention, the upper surfaces of two adjacent arc extinguishing sheets are provided with the convex blocks; and/or the lower surfaces of two adjacent arc extinguishing plates are provided with the convex blocks.

As a further improvement of the invention, the convex blocks on two side walls of two adjacent arc-extinguishing sheets which are oppositely arranged are arranged oppositely.

The structural design enables the gaps between the lugs of two adjacent arc-extinguishing plates to be smaller, and a basically controllable arc channel can be formed between the two adjacent arc-extinguishing plates, so that the arc can be formed and effectively cut. The arrangement state that positive and negative installation, the protruding crisscross setting of arc-extinguishing piece can be formed when its upper and lower surface has the lug simultaneously and set up in a staggered manner, and the crisscross distribution of electric arc that forms between two adjacent arc-extinguishing pieces this moment not only helps forming the electric arc passageway, can also guarantee the circulation of air simultaneously, helps the cooling of electric arc and extinguishes, can effectively improve the breaking capacity of this explosion chamber.

As a further improvement of the invention, the arc-extinguishing piece fixing device further comprises a supporting piece for fixing all the arc-extinguishing pieces, wherein the supporting piece is positioned on at least one side of the arc-extinguishing piece in the width direction, and the side edge of any arc-extinguishing piece in the width direction is fixedly connected with the supporting piece.

The support member may be used to hold the arc plates in a sequential arrangement with a certain gap.

As a further development of the invention, the number of the support elements is two.

The invention also provides a circuit breaker, which comprises at least one arc extinguish chamber.

Compared with the prior art, the arc extinguishing piece provided by the preferred embodiment of the invention is provided with the lug structure, the gap where the lug is located is small, a basically controllable arc channel can be formed, and the arc can be easily generated at the position where the arc channel is located. The arc extinguishing chamber and the circuit breaker processed by the arc extinguishing sheet can more easily form electric arcs when in use, and the formed electric arcs can be effectively cut; the lug structures arranged in a staggered manner can enable electric arcs to be formed in a staggered manner among the arc extinguishing sheets, cold cutting and extinguishing of the electric arcs are facilitated, and breaking capacity of the circuit breaker can be improved.

Drawings

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

Fig. 1 is a schematic structural view of a conventional arc extinguishing chamber;

figure 2 is a schematic structural view of the arc-extinguishing plate of the present invention;

FIG. 3 is a schematic cross-sectional view of FIG. 2;

figure 4 is a schematic view of a second configuration of the arc plate of the present invention;

FIG. 5 is a schematic cross-sectional view of FIG. 4;

FIG. 6 is a schematic view of the arc chute of the present invention;

FIG. 7 is a schematic diagram of the structure of the arc chute of the present invention;

figure 8 is an exploded view of a second embodiment of an arc chute of the present invention;

figure 9 is a cross-sectional view of a second embodiment of the arc chute of the present invention;

figure 10 is a structural schematic diagram of a third embodiment of the arc chute of the present invention;

figure 11 is a structural schematic diagram of a fourth embodiment of an arc chute of the invention;

fig. 12 is a schematic structural diagram of a fifth embodiment of an arc extinguishing chamber of the invention.

In the figure: 1. an arc extinguishing sheet; 11. cutting the arc part; 12. a bump; 2. a support member; 3. a gap.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more apparent, the technical solutions of the present invention will be described in detail below. It should be apparent that the described embodiments are only some embodiments of the present invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the examples given herein without any inventive step, are within the scope of the present invention.

In the description of the present invention, it is to be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", and the like, indicate orientations or positional relationships based on those shown in the drawings, merely for convenience of description and simplicity of description, and do not indicate or imply that the device or element so referred to must have a particular orientation, be constructed in a particular orientation, and be operated, and thus, are not to be construed as limiting the present invention. Furthermore, the terms "first," "second," "third," and the like 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 also be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; may be directly connected or indirectly connected through an intermediate. The specific meaning of the above terms in the present invention can be understood as appropriate to those of ordinary skill in the art.

The technical scheme of the invention is specifically explained in the following by combining the attached drawings.

The invention provides an arc-extinguishing piece 1, wherein the arc-extinguishing piece 1 is of a sheet structure made of a metal material and is approximately in a concave shape, a cutting arc part 11 is arranged in the middle of the arc-extinguishing piece, the cutting arc part 11 can cut an arc into a plurality of short arcs in the moving process, and the plurality of arc-extinguishing pieces 1 are stacked to cause the cutting short arcs to be connected in series, so that the purpose of arc extinction is achieved. The upper and/or lower surface of the cutting arc part 11 is formed to be protruded in a thickness direction thereof with at least one protrusion 12, as shown in fig. 2 and 4.

Certain gaps 3 are needed between the arc-extinguishing pieces 1 to ensure gas circulation, but when the distance between two adjacent arc-extinguishing pieces 1 is large, electric arcs are not easy to generate, and the position of the electric arcs is uncertain. The lug 12 structure on the cutting arc part 11 can properly reduce the distance between the adjacent cutting arc parts 11 on the premise of not changing the electric field and the magnetic field of the arc extinguish chamber, increases the surface area of the cutting arc part 11, not only enables the electric arc to be formed between the two arc extinguish plates 1 more easily, but also enables the electric arc located at the arc extinguish plates 1 to be effectively cut, and therefore the breaking capacity of the electric arc is improved. In addition, due to the addition of the structure of the bump 12, the structural strength of the arc extinguishing piece 1 is further enhanced, and the breaking reliability of the arc extinguishing chamber is finally improved.

The bump 12 may be a rectangular block or a cylindrical block, and the number of the bumps is not limited. In addition, the corresponding structure of the projection 12 and the arc-extinguishing piece 1 (i.e. the cutting arc portion 11) may be integrally formed, or may be fixedly connected by riveting, welding or other connection methods commonly used by those skilled in the art.

It should be noted that the number of projections 12 on one side of an arc plate 1 is at least one, and may be two, three or even more.

Specifically, the arc-extinguishing piece 1 has two basic structures, including a structure in which a protrusion 12 is provided only on one side (upper surface or lower surface) of the arc-extinguishing piece 1, and a structure in which a protrusion 12 is provided on both upper and lower surfaces of the arc-extinguishing piece 1.

When the arc-extinguishing piece 1 has the protrusions 12 on both the upper and lower surfaces, as an alternative embodiment, the protrusions 12 on the upper surface of the cut arc portion 11 are offset from the protrusions 12 on the lower surface of the cut arc portion 11, as shown in fig. 3 and 5.

The staggered lug 12 structure is beneficial to cooling and extinguishing the electric arc, and the breaking capacity of the electric arc is improved; in addition, the gas circulation and heat dissipation are also facilitated.

Specifically, the offset arrangement means that the two bumps 12 are not aligned, and then the center lines of the bumps 12 on the two different sidewalls do not coincide, or in other words, the projections of the two bumps 12 in the thickness direction do not completely coincide or even separate from each other.

In addition, at least one side of the arc-extinguishing piece 1 in the width direction is provided with a mounting lug, and the arc-extinguishing piece 1 can be fixedly mounted at a corresponding position or on a corresponding device through a mounting lug structure.

The invention provides an arc extinguish chamber which comprises any one of the arc extinguish plates 1, wherein all the arc extinguish plates 1 are sequentially arranged along the thickness direction of the arc extinguish plates, and a gap 3 is formed between every two adjacent arc extinguish plates 1.

Since all the arc-extinguishing plates 1 are arranged in the thickness direction, the projection 12 is located between two adjacent arc-extinguishing plates 1 and is convex with respect to the arrangement direction. Because the gap 3 where the projection 12 is located is smaller than the gaps 3 at other positions of the arc-extinguishing plate 1, the arc-extinguishing plate 1 can be easier to form an arc and can be cut effectively when in use.

It should be noted that, in general, the arc-extinguishing plates 1 are required to be arranged equidistantly and in parallel, and all the arc-extinguishing plates 1 are arranged in a stacked manner.

As an alternative embodiment, the arc-extinguishing chamber further comprises a support 2 for fixing all the arc-extinguishing plates 1, wherein the support 2 is made of an insulating material. The support member 2 is located at least one side of the arc-extinguishing piece 1 in the width direction, and the side edge (namely, the mounting lug) of any arc-extinguishing piece 1 in the width direction is fixedly connected with the support member 2.

The support 2 can be used to hold the arc plates 1 in a sequential arrangement and with a certain gap 3.

As an alternative embodiment, the number of supports 2 is two.

Example 1:

as shown in fig. 6 and 7, the present invention provides an arc extinguish chamber, which includes a plurality of arc extinguish plates 1 and a support member 2 for fixing the arc extinguish plates 1, wherein the number of the arc extinguish plates 1 is multiple, the arc extinguish plates 1 are sequentially arranged along the thickness direction thereof, and a gap 3 is left between two adjacent arc extinguish plates 1.

The quantity of support piece 2 is two and two support piece 2 are the same sheet structure of structure, and two support piece 2 set up the both sides on 1 width direction of arc-extinguishing piece relatively, the edge on 1 width direction of each arc-extinguishing piece and support piece 2 fixed connection.

Specifically, the side edge of the arc-extinguishing piece 1 is riveted with the support 2.

At this time, the upper surface and the lower surface of any arc extinguishing piece 1 forming the arc extinguishing chamber are provided with the convex blocks 12, and the convex blocks 12 on different side walls are arranged in a staggered manner. In addition, it should be noted that two adjacent arc-extinguishing plates 1 are arranged up and down symmetrically, that is, the convex blocks 12 on the opposite side walls of two adjacent arc-extinguishing plates 1 are arranged oppositely, so as to form an effect similar to the positive and negative installation of the arc-extinguishing plates 1, and realize the state of the staggered arrangement of the convex features.

The two lugs 12 which are arranged oppositely and are positioned on different arc-extinguishing plates 1 in the embodiment enable the gap 3 between the lugs 12 of two adjacent arc-extinguishing plates 1 to be smaller, and a basically controllable arc channel can be formed between two adjacent arc-extinguishing plates 1, so that the arc can be formed and effectively cut. When the lugs 12 are arranged on the upper surface and the lower surface of the arc extinguishing piece 1 at the same time and are arranged in a staggered manner, the arrangement state that the arc extinguishing pieces 1 are installed in a positive and negative manner and the lugs are arranged in a staggered manner is formed, and at the moment, electric arcs formed between the upper arc extinguishing piece 1 and the lower arc extinguishing piece 1 are arranged in a staggered manner. This structure not only helps forming the electric arc passageway, can also guarantee the air current simultaneously, helps the cooling and the extinguishing of electric arc, can effectively improve the disjunction ability of this explosion chamber.

In fig. 7, an arc is formed between two opposing bumps 12, and the arc moves in the direction indicated by the arrow in the figure.

Example 2:

as shown in fig. 8 and 9, the present embodiment 2 is different from embodiment 1 in that: the structure of the support 2 of the arc chute is different at this time. The supporting piece 2 is a molded insulating shell and has structural characteristics corresponding to the arc-extinguishing piece 1 so as to fix the arc-extinguishing piece 1, and the arc-extinguishing piece 1 can be assembled in a cavity of the supporting piece 2.

Example 3:

as shown in fig. 10, the present embodiment 3 is different from embodiment 1 in that: in this case, the arc extinguishing piece 1 constituting the arc extinguishing chamber is provided with a projection 12 only on one side. After the arc-extinguishing plates 1 are sequentially mounted, all the convex blocks 12 face to the same side. At this time, an arc path is formed between the adjacent projection 12 and the surface of the arc-extinguishing plate 1.

Specifically, the upper surfaces of two adjacent arc-extinguishing plates 1 are provided with bumps 12; or, the lower surfaces of two adjacent arc-extinguishing plates 1 are provided with the convex blocks 12. It should be noted that, lug 12 dislocation set on two adjacent arc extinguishing pieces 1, the 12 structures of lug that crisscross set up not only help forming the crisscross electric arc of arranging, can also guarantee gaseous circulation simultaneously, and clearance 3 between two adjacent arc extinguishing pieces 1 also makes the heat that the explosion chamber during operation produced can in time effectually distribute away, shifts the free gas of metal and the thing that ablates that produces in its working process.

Example 4:

as shown in fig. 11, the present embodiment 4 is different from the embodiment 3 in that: the convex blocks 12 on two adjacent arc-extinguishing plates 1 are arranged oppositely. Because of the existence of electrodynamic force among the currents, electric arcs can form mutual natural staggering, and an arc extinguish chamber formed by the arc extinguish plates 1 also has a certain cutting effect.

Example 5:

the present embodiment 5 is different from embodiment 1 in that: the convex blocks 12 on the upper surface and the lower surface of the same arc-extinguishing piece 1 are oppositely arranged.

It should be noted that, at this time, the protrusions 12 on two adjacent arc-extinguishing plates 1 may be arranged in a facing manner, as shown in fig. 12, or may be arranged in a staggered manner.

The invention also provides a circuit breaker, which comprises the arc extinguish chamber of any one of the above items, wherein the number of the arc extinguish chambers is at least one. The circuit breaker may be a molded case circuit breaker.

The above description is only for the specific embodiments of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art can easily conceive of the changes or substitutions within the technical scope of the present invention, and all the changes or substitutions should be covered within the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the appended claims.

Claims

1. The arc extinguishing sheet is characterized by being of a sheet structure, a cutting arc part (11) is arranged on the arc extinguishing sheet, and at least one protruding block (12) is formed on the upper surface and/or the lower surface of the cutting arc part (11) in a protruding mode in the thickness direction of the cutting arc part.

2. An arc plate according to claim 1, characterized in that the projections (12) on the upper surface of the cutting arc portion (11) are offset from the projections (12) on the lower surface of the cutting arc portion (11).

3. An arc plate according to claim 1, characterized in that the projections (12) are of one-piece construction with the cutting arc portion (11).

4. An arc plate according to claim 1, characterized in that the projections (12) are fixedly connected to the cutting arc portion (11).

5. Arc extinguishing chamber, characterized in that it comprises an arc extinguishing blade (1) according to any one of claims 1 to 4, the number of said arc extinguishing blades (1) being at least two; all the arc-extinguishing pieces (1) are sequentially arranged along the thickness direction of the arc-extinguishing pieces, and a gap (3) is formed between every two adjacent arc-extinguishing pieces (1).

6. An arc extinguishing chamber according to claim 5, characterized in that the upper surfaces of two adjacent extinguishing plates (1) are each provided with said projection (12); and/or the lower surfaces of two adjacent arc extinguishing plates (1) are provided with the convex blocks (12).

7. An arc extinguishing chamber according to claim 5 or 6, characterized in that the protrusions (12) on two opposite side walls of two adjacent arc extinguishing plates (1) are arranged facing each other.

8. The arc extinguishing chamber according to claim 5, characterized in that the arc extinguishing chamber further comprises a support (2) for fixing all the arc extinguishing plates (1), the support (2) is positioned on at least one side of the width direction of the arc extinguishing plates (1), and the side edge of any arc extinguishing plate (1) in the width direction is fixedly connected with the support (2).

9. Arc extinguishing chamber according to claim 8, characterized in that said supports (2) are two in number.

10. The circuit breaker, its characterized in that: comprising the arc chute according to any of claims 5-9, the number of said arc chutes being at least one.