CN210182317U - Anti-arc overflow structure - Google Patents
Anti-arc overflow structure Download PDFInfo
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- CN210182317U CN210182317U CN201920611507.9U CN201920611507U CN210182317U CN 210182317 U CN210182317 U CN 210182317U CN 201920611507 U CN201920611507 U CN 201920611507U CN 210182317 U CN210182317 U CN 210182317U
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- arc
- terminal cover
- terminal
- blocking
- circuit breaker
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Abstract
The utility model discloses an anti-arc overflow structure, it includes circuit breaker body (1), terminal cover (2) and fender arc bars piece (3), keep off arc bars piece (3) with install together terminal cover (2) dress terminal wiring end (101) of circuit breaker body (1) are used for right terminal wiring end (101) carry out the closing cap and keep apart its characterized in that to each mutually: the number of the arc-blocking grids (3) arranged in each phase of the terminal cover (2) is 1 or more, the arc-blocking grids (3) are L-shaped or inverted U-shaped or mouth-shaped or inverted U-shaped formed by a plurality of arc-blocking grids (3) "
And (4) shape. The structure for preventing the arc overflow ensures that the arc blocking grid sheet and the terminal cover are reliably and stably installed together by improving the structure of the arc blocking grid sheet and the installation mode of the terminal cover, and prevents free gas from flying out of the breaker in the breaking process of the breaker.
Description
Technical Field
The utility model belongs to the technical field of low-voltage circuit breaker, concretely relates to prevent excessive structure of electric arc, be particularly useful for the cooperation installation of circuit breaker terminal cover and arc extinguishing bars piece.
Background
The low-voltage circuit breaker plays a role in breaking and closing a circuit in the power transmission and distribution line. With the improvement of the breaking capacity requirement of the circuit breaker and the popularization of a large amount of gas generating materials, the internal air pressure of the circuit breaker is increased sharply during breaking. Under huge pressure, internal free gas or metal particles diffuse outside the circuit breaker in the breaking process, so that other low-voltage components in the cabinet are burnt under the corrosion action of electric arcs, and even a short circuit risk is formed. The terminal cover is an important accessory for the external connection of the molded case circuit breaker, is generally made of insulating materials and is used for eliminating electric arcs and enhancing the insulation grade of the circuit breaker.
As shown in fig. 1, in the prior art, a plurality of ribs are respectively disposed at intervals on two side surfaces of each first boss of the front terminal cover, slots are formed between every two adjacent ribs, and two sides of the partition board can be inserted into the corresponding slots. Chinese patent CN201811276617.0 discloses a terminal cover of a circuit breaker, wherein a front terminal cover is disposed at an air outlet of an arc extinguishing system of the circuit breaker, a partition is disposed toward the arc extinguishing system inside the circuit breaker, so as to deionize charged particles ejected from the arc extinguishing system of the circuit breaker, thereby reducing the damage of harmful gases to interphase or phase insulation, and residual metal gases after deionization are discharged into the air through an air hole disposed on the partition.
However, in the existing technical schemes, when the short-circuit fault occurs in the circuit breaker, the internal air pressure is too high during the breaking, and a part of free gas or metal ions still fly out of the upper end of the arc blocking terminal cover, so that the damage to external people or objects is caused; secondly, the arc blocking grid pieces are not tightly matched with the arc blocking terminal covers in an assembling mode, the arc blocking grid pieces are not firmly assembled, and the arc blocking grid pieces are easy to fall off in the process of transporting and installing the circuit breaker.
SUMMERY OF THE UTILITY MODEL
The utility model aims at providing a to above-mentioned current circuit breaker terminal cover structure and mounting means lead to easily keeping off the technical defect that the arc bars piece drops and partial electric arc is excessive, provide one kind and prevent the excessive structure of electric arc, keep off arc bars piece structure and terminal cover mounting means through improving, guaranteed that the reliable stable installation of keeping off arc bars piece and terminal cover is in the same place, avoided the circuit breaker at the disconnected in-process of branch, free gas departure outside the circuit breaker.
Technical scheme
In order to realize the technical purpose, the utility model provides an anti-arc overflow structure, it includes the circuit breaker body, terminal cover and fender arc bars piece, keep off the arc bars piece with the terminal cover dress is installed together the terminal wiring end of circuit breaker body is used for right the terminal wiring end carries out the closing cap and keeps apart its characterized in that to each phase: the number of the arc-blocking grid pieces arranged in each phase of the terminal cover is 1 or more, the arc-blocking grid pieces are L-shaped or inverted U-shaped or mouth-shaped or inverted U-shaped formed by a plurality of arc-blocking grid pieces
And (4) shaping.
Furthermore, the arc blocking grid sheet and the terminal cover are assembled together by an elastic positioning structure, and the terminal cover is assembled on the terminal end of the circuit breaker body by a guide limiting structure;
the elastic positioning structure comprises elastic feet on the upper plate wall of each phase partition plate of the terminal cover, mounting holes corresponding to the elastic feet are formed in the arc blocking grid pieces, and the elastic feet are inserted into the mounting holes and can abut against the hole walls of the mounting holes to achieve stable mounting of the arc blocking grid pieces and the terminal cover.
Furthermore, the terminal cover is provided with a pressure relief hole, the arc blocking grid sheet is provided with an air outlet hole, and when the arc blocking grid sheet and the terminal cover are assembled together, the pressure relief hole and the air outlet hole are arranged in a staggered mode.
Furthermore, the guiding and limiting structure comprises connecting convex ribs arranged at the inner side ends of the lower plate walls of the partition plates of each phase of the terminal cover, a plurality of wiring installation grooves are arranged in parallel on the terminal of the circuit breaker body, connecting grooves matched with the connecting convex ribs are arranged on the groove walls of the wiring installation grooves, and the connecting convex ribs are arranged in the connecting grooves to realize the stable installation of the terminal cover on the terminal of the circuit breaker body;
furthermore, the connecting convex ribs are T-shaped.
Advantageous effects
The utility model provides a pair of prevent excessive structure of electric arc keeps off arc bars piece structure and terminal cover mounting means through improving, has guaranteed to keep off the reliable stable installation of arc bars piece and terminal cover and has been in the same place, has avoided the circuit breaker at the disconnected in-process of breaking, and free gas flies out outside the circuit breaker.
Drawings
Fig. 1 shows a conventional terminal cover mounting method.
Fig. 2 is a schematic structural view of the terminal cover installation in embodiment 1 of the present invention.
Fig. 3a is a perspective view of the terminal cover and the arc-blocking fence in the embodiment 1 of the present invention.
Fig. 3b is an enlarged view of a portion a of fig. 3 a.
Fig. 3c is a schematic structural diagram of the terminal cover and the arc-blocking grid sheet in the embodiment 1 of the present invention.
Fig. 4 is a perspective view of the terminal cover according to embodiment 1 of the present invention.
Fig. 5 is a perspective view of an arc-blocking barrier in embodiment 1 of the present invention.
Fig. 6 is a perspective view of an arc-blocking barrier in embodiment 2 of the present invention.
Fig. 7 is a perspective view of the arc-blocking grid and the terminal cover in cooperation with each other in embodiment 3 of the present invention.
Fig. 8 is a perspective view of an arc-blocking barrier in embodiment 4 of the present invention.
Fig. 9 is a perspective view of an arc-blocking barrier in embodiment 5 of the present invention.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings and examples.
Example 1
As shown in fig. 2, an arc overflow preventing structure comprises a circuit breaker body 1, a terminal cover 2 and an arc blocking grid piece 3, as shown in fig. 5, the arc blocking grid piece 3 is L-shaped, the arc blocking grid piece 3 and the terminal cover 2 are assembled together and installed on a terminal 101 of the circuit breaker body 1 for covering the terminal 101 and isolating each phase, the arc blocking grid piece 3 and the terminal cover 2 are assembled together by an elastic positioning structure, and the terminal cover 2 is assembled on the terminal 101 of the circuit breaker body 1 by a guiding and limiting structure;
as shown in fig. 3a, the guiding and limiting structure includes a connecting protruding rib 201 disposed on an inner side end of a lower plate wall of each partition board of the terminal cover 2, in this embodiment, the connecting protruding rib 201 is T-shaped; as shown in fig. 2, the terminal wiring 101 on the circuit breaker body 1 is provided with a plurality of wiring installation grooves 101a in parallel, the groove walls of the plurality of wiring installation grooves 101a are provided with connection grooves 101a01 installed in cooperation with the connection ribs 201, the connection ribs 201 are installed in the connection grooves 101a01 to realize stable installation of the terminal cover 2 on the terminal wiring 101 of the circuit breaker body 1, so that phase-to-phase isolation and edgemost phase-to-circuit breaker body external isolation are realized, the isolation effect of free gas between phases in a breaking process can be improved, and the free gas cannot overflow to both sides of the external.
As shown in fig. 3a, 3b and 3c, the elastic positioning structure includes elastic legs 202 on upper walls of partition boards of each phase of the terminal cover 2, mounting holes 301 corresponding to the elastic legs 202 are formed on the arc blocking grid pieces 3, and the elastic legs 202 are inserted into the mounting holes 301 and can abut against hole walls of the mounting holes 301 to realize stable mounting of the arc blocking grid pieces 3 and the terminal cover 2; in the processes of breaking, transporting, installing and the like of the circuit breaker, the grid piece 3 can be well prevented from falling off by the fixed installation mode. Because keep off fixed other fasteners that do not need of arc bars piece 3 and terminal cover 2, and can with terminal cover 2 surface laminating, simple structure is light, small.
Meanwhile, as shown in fig. 4, the terminal cover 2 is provided with a pressure reducing hole 203, the arc blocking grid sheet 3 is provided with an air outlet hole 302, and when the arc blocking grid sheet 3 and the terminal cover 2 are assembled together, as shown in fig. 3c, the pressure reducing hole 203 and the air outlet hole 302 are arranged in a staggered manner, so that the trace of the arc overflow to pass through is longer, and the arc overflow can be more effectively prevented.
In the embodiment, in the breaking process of the circuit breaker, high-temperature and high-pressure gas is generated inside the circuit breaker, free particles of the gas are discharged out of the circuit breaker through a gas outlet of the circuit breaker, and the diffusion direction mainly faces upwards and forwards. The arc blocking grid piece 3 is matched with the terminal cover 2 and then applied to the circuit breaker, and is a structure for preventing electric arc from diffusing. Because the shape of keeping off arc bars piece 3 is the L shape, back in the assembly terminal cover 2, the front end and the upper end of circuit breaker all have and keep off arc bars piece, and when the free granule of gas spills over outside the circuit breaker, can be prevented most of granule by keeping off arc bars piece 3, can protect the people or thing outside the circuit breaker effectively not infringed by the electric arc.
Example 2
As shown in fig. 6, in another embodiment of the present invention, the shape of the arc-blocking bars 3 disposed in each phase of the terminal cover 2 is "n", the number of the arc-blocking bars 3 is at least one, and the length of the portion of the terminal cover 2 where the arc-blocking bars 3 are mounted is adapted to the number of the arc-blocking bars 3. The arc blocking grid 3 has a better effect of preventing the electric arc from overflowing at the front end of the breaker for the breaker with higher breaking energy.
Example 3
As shown in fig. 7, in another embodiment of the present invention, the number of the L-shaped arc-blocking bars 3 disposed in each phase of the terminal cover 2 is at least 2, and the L-shaped arc-blocking bars 3 are arranged in front of and behind each other, and the upper surface of each bar can have four mounting holes 301 and 4 elastic pins 202 inserted therein, and also can narrow the upper surface of each bar, so that the upper surface of each arc-blocking bar 3 has 2 mounting holes 301 and 2 elastic pins 202 inserted therein. Meanwhile, the length of the portion of the terminal cover 2 where the arc-blocking fence 3 is installed is adapted to the number of the arc-blocking fence 3. For the circuit breaker with higher breaking energy, the arc blocking grid piece 3 also has a better effect of preventing the arc from overflowing at the front end of the circuit breaker.
Example 4
As shown in fig. 8, in another embodiment provided by the present invention, the arc blocking grid 3 provided in each phase of the terminal cover 2 is in the shape of "mouth", and this structure can effectively prevent the arc from moving downward after the arc enters the grid, and prevent the arc from burning the connecting wire, and the lower end surface of the "mouth" arc blocking grid is a mesh hole or plate. The number of the arc-blocking grid pieces 3 in the shape of the mouth is at least one, and the length of the part of the terminal cover 2, where the arc-blocking grid pieces 3 are installed, is adapted to the number of the arc-blocking grid pieces 3.
Example 5
As shown in fig. 9, in still another embodiment of the present invention, the shape of the arc-blocking grid 3 disposed in each phase of the terminal cover 2 is
The shape is kept off arc bars piece 3 by 2L shapes and is formed by the mode of staggering from beginning to end, cooperation department between them, below keep off arc bars, 3 tip have the arch, the top keeps off arc bars piece 3 porosely, the arch of 3 tip of below fender arc bars piece inserts the hole back that the arc bars piece 3 was kept off to the top, both riveting fixed, can prevent free gas forward and up departure more effectively. The above-mentioned
The number of the arc-blocking grids 3 is at least 1, and the length of the part of the terminal cover 2 where the arc-blocking grids 3 are arranged is matched with the number of the arc-blocking grids 3.
The utility model provides a pair of prevent excessive structure of electric arc keeps off arc bars piece structure and terminal cover mounting means through improving, has guaranteed to keep off the reliable stable installation of arc bars piece and terminal cover and has been in the same place, has avoided the circuit breaker at the disconnected in-process of breaking, and free gas flies out outside the circuit breaker.
The structure, proportion, size, quantity, etc. shown in the attached drawings of the embodiment of the present invention are only used for matching with the contents disclosed in the specification, so as to be known and read by people familiar with the art, not for limiting the limit conditions that the present invention can be implemented, so that the present invention has no technical essential meaning, and the modification of any structure, the change of proportion relation or the adjustment of size should still fall within the range that the technical contents can be covered without affecting the function that the present invention can produce and the purpose that can be achieved. Meanwhile, the terms such as "upper", "lower", "left", "right", "middle", "clockwise", "counterclockwise", etc. used in the present specification are for the sake of clarity only, and are not intended to limit the scope of the present invention, and changes or adjustments of the relative relationship thereof are considered to be the scope of the present invention without substantial changes in the technical content.
Claims (5)
1. An arc overflow prevention structure comprises a breaker body (1), a terminal cover (2) and an arc blocking grid piece (3), wherein the arc blocking grid piece (3) and the terminal cover (2) are installed together on a terminal wiring end (101) of the breaker body (1) and used for sealing the terminal wiring end (101) and isolating each phase, and the arc overflow prevention structure is characterized in that: the number of the arc-blocking grids (3) arranged in each phase of the terminal cover (2) is 1 or more, the arc-blocking grids (3) are L-shaped or inverted U-shaped or mouth-shaped or formed by a plurality of arc-blocking grids (3)
And (4) shaping.
2. The arc overflow prevention structure of claim 1, wherein: the arc blocking grid sheet (3) and the terminal cover (2) are assembled together by an elastic positioning structure, and the terminal cover (2) is assembled on a terminal (101) of the circuit breaker body (1) by a guide limiting structure;
elastic positioning structure includes elastic foot (202) on the last siding wall of each looks baffle of terminal cover (2), be equipped with on fender arc bars piece (3) with mounting hole (301) that elastic foot (202) correspond, elastic foot (202) cartridge is in can support in mounting hole (301) the pore wall of mounting hole (301) is realized keep off arc bars piece (3) with the stable installation of terminal cover (2).
3. The arc overflow prevention structure of claim 1, wherein: the terminal cover is characterized in that a pressure reducing hole (203) is formed in the terminal cover (2), air outlet holes (302) are formed in the arc blocking grid pieces (3), and when the arc blocking grid pieces (3) and the terminal cover (2) are assembled together, the pressure reducing hole (203) and the air outlet holes (302) are arranged in a staggered mode.
4. The arc overflow prevention structure of claim 2, wherein: the direction limit structure includes terminal cover (2) each looks baffle the inboard connection protruding rib (201) that sets up of serving of lower wallboard, terminal wiring end (101) on circuit breaker body (1) are equipped with a plurality of wiring mounting grooves (101a) side by side, be equipped with on the cell wall of a plurality of wiring mounting grooves (101a) with connection protruding rib (201) cooperation spread groove (101a01) of installing, connection protruding rib (201) dress is realized in spread groove (101a01) terminal cover (2) is in the stable installation of terminal wiring end (101) of circuit breaker body (1).
5. The arc overflow prevention structure of claim 4, wherein: the connecting convex rib (201) is T-shaped.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920611507.9U CN210182317U (en) | 2019-04-29 | 2019-04-29 | Anti-arc overflow structure |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920611507.9U CN210182317U (en) | 2019-04-29 | 2019-04-29 | Anti-arc overflow structure |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN210182317U true CN210182317U (en) | 2020-03-24 |
Family
ID=69832285
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201920611507.9U Active CN210182317U (en) | 2019-04-29 | 2019-04-29 | Anti-arc overflow structure |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN210182317U (en) |
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2019
- 2019-04-29 CN CN201920611507.9U patent/CN210182317U/en active Active
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