CN113593996A - Arc extinguishing chamber for small-sized direct current quick breaker - Google Patents
Arc extinguishing chamber for small-sized direct current quick breaker Download PDFInfo
- Publication number
- CN113593996A CN113593996A CN202111042207.1A CN202111042207A CN113593996A CN 113593996 A CN113593996 A CN 113593996A CN 202111042207 A CN202111042207 A CN 202111042207A CN 113593996 A CN113593996 A CN 113593996A
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- CN
- China
- Prior art keywords
- arc
- extinguishing
- arc chute
- grid
- encloser
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- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H73/00—Protective overload circuit-breaking switches in which excess current opens the contacts by automatic release of mechanical energy stored by previous operation of a hand reset mechanism
- H01H73/02—Details
- H01H73/18—Means for extinguishing or suppressing arc
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H9/00—Details of switching devices, not covered by groups H01H1/00 - H01H7/00
- H01H9/30—Means for extinguishing or preventing arc between current-carrying parts
- H01H9/34—Stationary parts for restricting or subdividing the arc, e.g. barrier plate
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H9/00—Details of switching devices, not covered by groups H01H1/00 - H01H7/00
- H01H9/30—Means for extinguishing or preventing arc between current-carrying parts
- H01H9/34—Stationary parts for restricting or subdividing the arc, e.g. barrier plate
- H01H9/36—Metal parts
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H9/00—Details of switching devices, not covered by groups H01H1/00 - H01H7/00
- H01H9/30—Means for extinguishing or preventing arc between current-carrying parts
- H01H9/44—Means for extinguishing or preventing arc between current-carrying parts using blow-out magnet
Landscapes
- Arc-Extinguishing Devices That Are Switches (AREA)
Abstract
The invention discloses an arc extinguishing chamber for a small-sized direct current quick breaker, comprising: the first arc extinguishing encloser and the second arc extinguishing encloser are symmetrically arranged, and the first arc extinguishing encloser and the second arc extinguishing encloser are communicated to form a hollow space together; the first magnetic conduction plate and the second magnetic conduction plate are respectively arranged on the surface of the first arc extinguishing cover shell and the surface of the second arc extinguishing cover shell in a surface-mounted manner; two groups of arc extinguishing grid pieces are symmetrically arranged in the first arc extinguishing encloser and the second arc extinguishing encloser, and are separated by a certain distance to form an arc extinguishing channel; each arc-extinguishing grid piece is formed by overlapping a metal grid piece and an insulating grid piece, and a notch is formed in each arc-extinguishing grid piece. The invention utilizes the metal grid plates to cut the current arc, and the metal grid plates adopt asymmetric triangular gaps, and the triangular gaps between two adjacent metal grid plates are staggered, so that the current arc can be elongated, and the cooling and extinguishing of the current arc are facilitated.
Description
Technical Field
The invention relates to the field of arc extinguishers. More particularly, the present invention relates to an arc chute for a miniature dc fast circuit breaker.
Background
Arc chutes are an important part of circuit breakers, and are relatively common devices for bringing an arc into contact with a solid medium to lower the temperature of the arc, thereby accelerating the extinction of the arc. However, the existing arc extinguishing cover generally has the problems of low arc extinguishing efficiency and low speed.
Disclosure of Invention
To achieve these objects and other advantages in accordance with the purpose of the invention, there is provided an arc chute for a small dc quick circuit breaker, comprising:
the first arc extinguishing encloser and the second arc extinguishing encloser are symmetrically arranged, and the first arc extinguishing encloser and the second arc extinguishing encloser are communicated to form a hollow space together;
the first magnetic conduction plate and the second magnetic conduction plate are respectively arranged on the surface of the first arc extinguishing cover shell and the surface of the second arc extinguishing cover shell in a surface-mounted manner; and
two groups of arc extinguishing grid pieces are symmetrically arranged in the first arc extinguishing encloser and the second arc extinguishing encloser, and are separated by a certain distance to form an arc extinguishing channel;
each arc-extinguishing grid piece is formed by overlapping a metal grid piece and an insulating grid piece, and a notch is formed in each arc-extinguishing grid piece.
According to a preferred embodiment of the present invention, each set of the arc chute plates includes a plurality of arc chute plates, and each arc chute plate is obliquely installed on an inner wall of the first arc chute housing or the second arc chute housing.
According to a preferred embodiment of the present invention, the arc chute for the small dc fast circuit breaker is provided with a groove on the inner wall of each of the first arc chute and the second arc chute for mounting the arc chute.
According to a preferred embodiment of the present invention, the arc chute for the small dc fast circuit breaker includes a first magnetic conductive block and a second magnetic conductive block respectively disposed on a surface of the first arc chute and a surface of the second arc chute, wherein the first magnetic conductive block is connected to the first magnetic conductive plate, and the second magnetic conductive block is connected to the second magnetic conductive plate.
According to a preferred embodiment of the present invention, the arc chute for the miniature dc quick circuit breaker is provided with an arc baffle at the top of the hollow space, and the arc baffle is located above the arc chute.
According to a preferred embodiment of the present invention, the arc chute for the small dc fast circuit breaker has one side of the metal grid installed on the inner wall of the first arc chute or the inner wall of the second arc chute, and the other side of the metal grid has a triangular notch, and the triangular notch is asymmetrically arranged.
According to a preferred embodiment of the present invention, the arc extinguishing chamber for a small dc fast circuit breaker includes an upper insulating grid and a lower insulating grid connected to each other, a U-like notch is formed on a side of the lower insulating grid away from the upper insulating grid, the metal grid and the lower insulating grid are attached to each other, and the U-like notch of the lower insulating grid is partially overlapped with the triangular notch of the metal grid.
According to a preferred embodiment of the present invention, the thickness of the upper insulating grid is greater than the thickness of the lower insulating grid, and the upper insulating grid and the lower insulating grid are connected to form a receiving surface for receiving the metal grid on the surface of the lower insulating grid.
According to a preferred embodiment of the present invention, the triangular notches of two adjacent metal grids are staggered.
According to a preferred embodiment of the present invention, the width of the metal grid plate is sequentially increased along the moving direction of the current arc in the arc extinguishing channel, and the width of the upper insulating grid plate and the lower insulating grid plate corresponding to each metal grid plate is also sequentially increased.
According to a preferred embodiment of the present invention, the arc chute for the small dc quick circuit breaker is disposed obliquely and at an acute angle with the first arc chute housing 1 and the second arc chute housing 2 along the moving direction of the current arc in the arc chute.
The invention at least comprises the following beneficial effects:
1. the arc extinguishing cover for the small-sized direct current quick circuit breaker is matched with a direct current quick circuit breaker magnetic blowing system for use, when the circuit breaker breaks current, the magnetic blowing system enables a magnetic field to be generated between the first magnetic conduction plate and the second magnetic conduction plate, the broken current arc can be quickly introduced into the hollow space formed by the first arc extinguishing encloser and the second arc extinguishing encloser in a communicated mode, the current arc is accordingly cut by the metal grid pieces, and the metal grid pieces adopt asymmetric triangular gaps, and the triangular gaps between every two adjacent metal grid pieces are arranged in a staggered mode, so that the current arc can be lengthened, and the cooling and the extinguishing of the current arc are facilitated.
2. In the arc-extinguishing cover for the small direct current quick circuit breaker, the arc-extinguishing grid plates adopt a metal grid plate and insulating grid plate superposition mode, current arcs firstly enter the metal grid plates and are divided into short arcs, the arc cooling can be accelerated through the insulating grid plates, and the metal grid plates and the insulating grid plate stack layers form 30-degree included angles with the bottom edges, so that the current arcs can enter between the grid plates, and the arc-extinguishing cover is smaller in size.
3. In the arc-extinguishing cover for the small direct current quick circuit breaker, the arc-blocking plate is arranged at the top of the arc-extinguishing cover, so that the arc can be extinguished and can fly out of the outer arc.
4. In the first arc extinguishing encloser or the second arc extinguishing encloser, the lower parts of the two groups of arc extinguishing grid pieces are splayed cavities, so that arc striking bars are favorable for lengthening and leading electric arcs into the arc extinguishing grid pieces.
Additional advantages, objects, and features of the invention will be set forth in part in the description which follows and in part will become apparent to those having ordinary skill in the art upon examination of the following or may be learned from practice of the invention.
Drawings
Fig. 1 is a schematic view showing the overall structure of an arc chute for a small-sized dc quick circuit breaker according to the present invention.
Fig. 2 is a schematic structural view of the first arc extinguishing enclosure or the second arc extinguishing enclosure according to the present invention.
Fig. 3 is a schematic structural diagram of each group of arc chute plates along the moving direction of the current arc in the arc extinguishing channel.
Fig. 4 is a schematic structural diagram of a metal grid.
Fig. 5 is a schematic structural diagram of an insulated gate plate.
Fig. 6 is a schematic cross-sectional view of an insulated gate plate.
Fig. 7 is a schematic cross-sectional view of each arc chute.
The specification reference numbers indicate: the arc extinguishing device comprises a first arc extinguishing encloser 1, a second arc extinguishing encloser 2, a first magnetic conduction plate 3, a first magnetic conduction block 4, a second magnetic conduction plate 5, a second magnetic conduction block 6, an arc extinguishing grid sheet 78, a metal grid sheet 7, an insulating grid sheet 8, an arc blocking plate 9, an insulating pressing strip 10, an upper insulating grid sheet 81, a lower insulating grid sheet 82 and an arc extinguishing channel 11.
Detailed Description
The present invention is further described in detail below with reference to the attached drawings so that those skilled in the art can implement the invention by referring to the description text.
The following description is presented to disclose the invention so as to enable any person skilled in the art to practice the invention. The preferred embodiments in the following description are given by way of example only, and other obvious variations will occur to those skilled in the art. The basic principles of the invention, as defined in the following description, may be applied to other embodiments, variations, modifications, equivalents, and other technical solutions without departing from the spirit and scope of the invention.
It will be understood by those skilled in the art that in the present disclosure, the terms "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," and the like are used in an orientation or positional relationship indicated in the drawings for ease of description and simplicity of description, and do not indicate or imply that the referenced devices or components must be constructed and operated in a particular orientation and thus are not to be considered limiting.
As shown in fig. 1 to 7, an arc chute for a small-sized dc quick circuit breaker of the present invention comprises:
the arc extinguishing device comprises a first arc extinguishing encloser 1 and a second arc extinguishing encloser 2 which are symmetrically arranged, wherein the first arc extinguishing encloser 1 is communicated with the second arc extinguishing encloser 2 to form a hollow space;
the first magnetic conduction plate 3 and the second magnetic conduction plate 5 are respectively arranged on the surface of the first arc extinguishing encloser 1 and the surface of the second arc extinguishing encloser 2 in a surface-mounted manner; and
two groups of arc extinguishing grid pieces are symmetrically arranged in the first arc extinguishing encloser 1 and the second arc extinguishing encloser 2, and the two groups of arc extinguishing grid pieces are separated by a certain distance to form an arc extinguishing channel 11; the surface of the first arc extinguishing housing 1 and the surface of the second arc extinguishing housing 2 are respectively provided with a first magnetic conduction block 4 and a second magnetic conduction block 6, the first magnetic conduction block 4 is positioned below the first magnetic conduction plate 3, and the second magnetic conduction block 6 is positioned below the second magnetic conduction plate 4.
Each arc-extinguishing grid plate 78 is formed by overlapping a metal grid plate 7 and an insulating grid plate 8, and a notch is formed in each arc-extinguishing grid plate 78.
The arc extinguishing cover for the small-sized direct current quick circuit breaker is matched with a direct current quick circuit breaker magnetic blowing system for use, when the circuit breaker breaks current, the magnetic blowing system enables a magnetic field to be generated between the first magnetic conduction plate 3 and the second magnetic conduction plate 5, the broken current arc can be quickly introduced into the hollow space formed by the first arc extinguishing encloser 1 and the second arc extinguishing encloser 2 which are communicated, and the current arc is cut by the metal grid pieces.
In the arc-extinguishing cover for the small direct current quick circuit breaker, the arc-extinguishing grid plates adopt a metal grid plate and insulating grid plate superposition mode, current arcs firstly enter the metal grid plates and are divided into short arcs, and the arc cooling can be accelerated through the insulating grid plates.
According to a preferred embodiment of the present invention, in the arc chute for the small dc fast circuit breaker, the first arc chute housing 1 and the second arc chute housing 2 are respectively provided with a first magnetic conductive block 4 and a second magnetic conductive block 6, the first magnetic conductive block 4 is connected to the first magnetic conductive plate 3, and the second magnetic conductive block 6 is connected to the second magnetic conductive plate 5.
The first arc extinguishing encloser 1 and the second arc extinguishing encloser 2 are made of insulating composite materials, the metal grid 7 is a ferromagnetic metal plate, and the first magnetic conduction block 3, the second magnetic conduction block 5, the first magnetic conduction plate and the second magnetic conduction plate are soft magnetic metal plates. The insulated gate 8 is made of an arc-resistant and gas-generating material with excellent insulating property;
according to a preferred embodiment of the present invention, each set of the arc chute plates includes a plurality of arc chute plates 78, and each arc chute plate 78 is obliquely installed on an inner wall of the first arc chute housing 1 or the second arc chute housing 2.
According to a preferred embodiment of the present invention, in the arc chute for the small dc fast circuit breaker, grooves are formed on the inner walls of the first arc chute housing 1 and the second arc chute housing 2 for installing the arc chute pieces 78, and the arc chute pieces 78 are fixed in the grooves by insulating pressing strips 10.
According to a preferred embodiment of the present invention, the arc chute for the small dc quick breaker is provided with an arc baffle 10 at the top of the hollow space, which is located above the arc chute 11. The arc baffle 10 is arranged to facilitate arc extinguishing and upward external arc flying.
According to a preferred embodiment of the present invention, in the arc chute for the small dc fast circuit breaker, one side of the metal grid 7 is installed on the inner wall of the first arc chute housing 1 or the inner wall of the second arc chute housing 1, and the other side of the metal grid has a triangular notch 71, and the triangular notch 71 is asymmetrically arranged.
According to a preferred embodiment of the present invention, the arc-extinguishing chamber for a small dc fast breaker, the insulated gate 8 includes an upper insulated gate 81 and a lower insulated gate 82 connected to each other, a U-shaped notch 821 is formed on a side of the lower insulated gate 82 away from the upper insulated gate 81, the metal gate 7 is attached to the lower insulated gate 81, and the U-shaped notch 821 of the lower insulated gate 82 partially overlaps the triangular notch 71 of the metal gate 7 to form a notch on the arc-extinguishing gate 78.
According to a preferred embodiment of the present invention, in the arc-extinguishing chamber for the small dc fast breaker, the thickness of the upper insulating grid 81 is greater than the thickness of the lower insulating grid 82, and the upper insulating grid is connected to the lower insulating grid 82, and a receiving surface for receiving the metal grid 7 is formed on the surface of the lower insulating grid 82, in this case, the metal grid 7 is attached to the lower insulating grid 82, and the sum of the thicknesses of the metal grid 7 and the lower insulating grid 82 is equal to the thickness of the upper insulating grid 81, so that the thickness of the entire grid arc-extinguishing plate 78 is uniform, and the arc-extinguishing chamber is more beautiful.
According to a preferred embodiment of the present invention, the triangular notches of two adjacent metal grid pieces 7 are staggered, so that the current arc can be elongated, and the cooling and extinguishing of the current arc are facilitated.
According to a preferred embodiment of the present invention, the arc chute for a small dc quick breaker has a width L of the metal grid 7 which increases in sequence along the moving direction of the current arc in the arc chute 11, and a width L1 of the upper insulating grid 81 and a width L2 of the lower insulating grid 82 corresponding to each metal grid 7 also increase in sequence. Under the condition, in the first arc extinguishing encloser 1 or the second arc extinguishing encloser 2, the lower parts of the two groups of arc extinguishing grid pieces are splayed cavities, so that arc striking rows are facilitated to elongate electric arcs and introduce the electric arcs into the arc extinguishing grid pieces.
According to a preferred embodiment of the present invention, the arc chute 78 is disposed obliquely and acutely to the first arc chute housing 1 and the second arc chute housing 2 along the moving direction of the current arc in the arc chute 11, and the angle between the arc chute 78 and the first arc chute housing 1 and the second arc chute housing 2 is preferably 30 °. This facilitates the entry of current arcs between the grids, making the arc chute smaller in size.
While embodiments of the invention have been described above, it is not limited to the applications set forth in the description and the embodiments, which are fully applicable in various fields of endeavor to which the invention pertains, and further modifications may readily be made by those skilled in the art, it being understood that the invention is not limited to the details shown and described herein without departing from the general concept defined by the appended claims and their equivalents.
Claims (10)
1. An arc chute for a miniature direct current fast circuit breaker comprising:
the first arc extinguishing encloser and the second arc extinguishing encloser are symmetrically arranged, and the first arc extinguishing encloser and the second arc extinguishing encloser are communicated to form a hollow space together;
the first magnetic conduction plate and the second magnetic conduction plate are respectively arranged on the surface of the first arc extinguishing cover shell and the surface of the second arc extinguishing cover shell in a surface-mounted manner; and
two groups of arc extinguishing grid pieces are symmetrically arranged in the first arc extinguishing encloser 1 and the second arc extinguishing encloser 2, and are separated by a certain distance to form an arc extinguishing channel;
each arc-extinguishing grid piece is formed by overlapping a metal grid piece and an insulating grid piece, and a notch is formed in each arc-extinguishing grid piece.
2. The arc chute for a small dc quick circuit breaker according to claim 1, wherein each set of the arc chute pieces comprises a plurality of arc chute pieces, and each of the arc chute pieces is installed to be inclined to an inner wall of the first arc chute case or the second arc chute case.
3. The arc chute for a small dc fast circuit breaker according to claim 1, wherein said first and second arc chute housing surfaces are respectively provided with a first magnetic conductive block and a second magnetic conductive block, said first magnetic conductive block is connected to said first magnetic conductive plate, and said second magnetic conductive block is connected to said second magnetic conductive plate.
4. The arc chute for small dc quick circuit breakers as claimed in claim 1, wherein said hollow space is surmounted by an arc baffle, which is located above said arc chute.
5. The arc chute for a small dc quick circuit breaker according to claim 2, wherein said metal grid is installed on one side of the inner wall of said first arc chute housing or the inner wall of said second arc chute housing, and has a triangular notch on the other side, and said triangular notch is asymmetrically disposed.
6. The arc chute for small dc quick circuit breaker according to claim 5, wherein said insulated gate comprises an upper insulated gate and a lower insulated gate connected to each other, a side of said lower insulated gate away from said upper insulated gate has a U-like notch, said metal gate is attached to said lower insulated gate, and said U-like notch of said lower insulated gate partially coincides with said triangular notch of said metal gate.
7. The arc chute of claim 6 wherein said upper dielectric grid is thicker than said lower dielectric grid, and they are connected to form a receiving surface for receiving said metal grid on the surface of said lower dielectric grid.
8. The arc chute for small dc quick circuit breakers of claim 5 wherein said triangular notches of adjacent two of said metal grids are staggered.
9. The arc chute for small dc quick circuit breaker according to claim 6, wherein the width of said metal grid pieces is sequentially increased and the width of said upper and lower insulating grid pieces corresponding to each of said metal grid pieces is also sequentially increased along the moving direction of current arc in said arc chute.
10. The arc chute for a small dc quick circuit breaker according to claim 1, wherein the arc chute pieces are disposed obliquely to the first arc chute shell and the second arc chute shell and at an acute angle along a moving direction of the current arc in the arc chute.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111042207.1A CN113593996A (en) | 2021-09-07 | 2021-09-07 | Arc extinguishing chamber for small-sized direct current quick breaker |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111042207.1A CN113593996A (en) | 2021-09-07 | 2021-09-07 | Arc extinguishing chamber for small-sized direct current quick breaker |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN113593996A true CN113593996A (en) | 2021-11-02 |
Family
ID=78241385
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202111042207.1A Pending CN113593996A (en) | 2021-09-07 | 2021-09-07 | Arc extinguishing chamber for small-sized direct current quick breaker |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN113593996A (en) |
-
2021
- 2021-09-07 CN CN202111042207.1A patent/CN113593996A/en active Pending
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