CN217881385U - Circuit breaker, arc extinguish chamber and resistance-reducing grid piece thereof - Google Patents
Circuit breaker, arc extinguish chamber and resistance-reducing grid piece thereof Download PDFInfo
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- CN217881385U CN217881385U CN202222162348.3U CN202222162348U CN217881385U CN 217881385 U CN217881385 U CN 217881385U CN 202222162348 U CN202222162348 U CN 202222162348U CN 217881385 U CN217881385 U CN 217881385U
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Abstract
The utility model discloses a gate sheet is hindered in falling of explosion chamber falls and hinders the terminal portion border that gate sheet and explosion chamber entry correspond and be equipped with the breach in the middle position, and this breach both sides are different towards the outdoor protrusion size of explosion chamber, are long, short arc end of advancing respectively. The long and short arc inlet ends of the resistance reducing grid pieces are alternately arranged, so that when the electric arc enters the arc extinguish chamber, the long and short arc inlet ends of the resistance reducing grid pieces repeatedly cut for a plurality of times in different time, the electric arc is cut into longer electric arc sections firstly, the number of the grid pieces for cutting the electric arc for the first time is reduced, the entering resistance of the electric arc is reduced, the electric arc is ensured to continuously and quickly enter the arc extinguish chamber and then is cut into shorter electric arc sections, and the electric arc extinguishing speed is improved. The utility model discloses still provide the circuit breaker of using the explosion chamber of above-mentioned falling resistance grid piece, using this explosion chamber, can reduce the resistance, make electric arc get into the explosion chamber fast, improve electric arc extinguishing speed.
Description
Technical Field
The utility model relates to a mechanical industry technical field, more specifically say, relate to a descending of explosion chamber hinders bars piece, an explosion chamber still relates to a circuit breaker.
Background
The direct current has no current zero-crossing characteristic compared with the alternating current, so that the direct current circuit breaker cannot extinguish the arc by using the characteristic of the current zero-crossing point like the alternating current circuit breaker, and the direct current circuit breaker can extinguish the arc only through the arc extinguishing chamber. The arc extinguishing chamber is internally provided with a plurality of grid pieces which are arranged in parallel at equal intervals one by one, when the circuit breaker is switched on and off to generate electric arcs, the electric arcs enter the arc extinguishing chamber, are cut into short arcs by the grid pieces and are cooled, so that the electric arc voltage is increased, the electric arc resistance is increased, and the electric arcs are extinguished when the electric arc voltage is greater than the power supply voltage.
The speed that the explosion chamber extinguish electric arc receives electric arc to get into the resistance influence of explosion chamber, and the border that bars piece and explosion chamber entry correspond the tip sets up the breach between two parties among the current explosion chamber, and breach bilateral symmetry, adjacent bars piece cut electric arc simultaneously, and the resistance is big, is unfavorable for electric arc to get into the explosion chamber fast, influences electric arc extinguishing speed.
In addition, the static contact module is located the rear end of explosion chamber among the circuit breaker, and under the condition that the sound contact module separated a large amount of metal particles in the twinkling of an eye, the explosion chamber rear end contacted electric arc earlier, caused the explosion chamber rear end easily to block up, led to a plurality of adjacent bars of explosion chamber rear end department to pass through the metal particles and establish ties, the electric potential equals, only plays the effect of a slice bar, and the bar cutting electric arc segment becomes few, and electric arc voltage step-down is unfavorable for the arc extinguishing.
In summary, how to optimize the structural design of the grid plate and reduce the resistance of the arc entering the arc extinguishing chamber is a problem to be solved urgently by those skilled in the art.
SUMMERY OF THE UTILITY MODEL
In view of this, the utility model provides a fall and hinder grid piece, its tip border that corresponds with the explosion chamber entry is central to be equipped with the breach, and the part of this breach both sides is different towards the outer convex size of explosion chamber entry, be length respectively, short arc end of advancing, by falling the length that hinders grid piece when making electric arc get into the explosion chamber, short arc end of advancing is in the not equidimension cutting many times of relapse, compare in the mode of adjacent grid piece cutting electric arc simultaneously among the prior art, make electric arc cut earlier for longer electric arc section, reduce the resistance, ensure that electric arc continues to get into the inside cutting again of explosion chamber fast for shorter electric arc section, thereby improve electric arc extinguishing speed. The utility model discloses still provide the circuit breaker of using the explosion chamber of above-mentioned falling resistance grid piece, using this explosion chamber, can reduce the resistance, make electric arc get into the explosion chamber fast, improve electric arc extinguishing speed.
In order to achieve the above object, the utility model provides a following technical scheme:
the utility model provides a falling of explosion chamber hinders bars piece, fall in hindering bars piece with the border of the tip that the entry of explosion chamber corresponds is middle to be equipped with the breach, and this tip is located in the two parts of breach both sides, partly than another part court the outer protrusion size of entry of explosion chamber is more, for long arc end of advancing, another part is short arc end of advancing.
An arc extinguish chamber is used for a circuit breaker and comprises a plurality of grid sheets which are arranged in a layered mode, wherein each grid sheet comprises a plurality of first grid sheets, and each first grid sheet is a resistance reducing grid sheet provided by the technical scheme; the first grid pieces are arranged one by one, and the long arc inlet ends and the short arc inlet ends of every two adjacent first grid pieces are alternately arranged.
Preferably, in the arc extinguish chamber, the arc extinguish chamber further comprises a second grid, a gap is arranged in the second grid at the central position of the edge of the end part corresponding to the inlet of the arc extinguish chamber, and the parts of the end part located at two sides of the gap are symmetrical to each other.
Preferably, in the arc-extinguishing chamber, the grid pieces are divided into a plurality of groups along the layered arrangement direction; in the two adjacent groups, the gap size of the adjacent grid sheet in the grid sheet which firstly contacts the electric arc generated by the breaker is larger.
Preferably, in the arc extinguish chamber, the gap between any two adjacent grid plates in each group of grid plates is the same in size.
Preferably, in the arc-extinguishing chamber, the grid pieces are divided into three groups, and the first, second and third groups of grid pieces are sequentially arranged along the sequence of contacting the electric arc; the first group of grid pieces and the second group of grid pieces are respectively the first grid pieces; the third group of grid pieces adopt the second grid pieces.
Preferably, in the arc-extinguishing chamber, the lengths of the grid pieces in the third group are gradually reduced along the sequence of contacting the electric arc; the length of the grid piece is from one end of the grid piece corresponding to the opening of the arc extinguish chamber to the other end of the grid piece.
Preferably, in the arc extinguish chamber, the ends of the plurality of grid plates corresponding to the inlets of the arc extinguish chamber are arranged in an arc shape one by one, and the shape of the arc shape is consistent with the shape of the moving track of the moving contact module in the circuit breaker.
Preferably, in the arc-extinguishing chamber, the grid pieces are parallel to each other; the arc extinguishing chamber comprises a back plate, a left arc isolating side plate fixed on the back plate and a right arc isolating side plate fixed on the back plate; the grid pieces are fixed on the two arc-isolating side plates and are perpendicular to the back plate.
A circuit breaker comprises a shell, and an arc extinguish chamber, a movable contact module and a fixed contact module which are respectively arranged in the shell, wherein the arc extinguish chamber is the arc extinguish chamber in any one of the technical schemes; the static contact module is close to the rear end of the arc extinguish chamber.
The utility model provides a gate sheet is hindered in falling of explosion chamber falls the border of the tip that corresponds with the entry of explosion chamber in the gate sheet and is centrally provided with the breach, and this tip is arranged in the two parts of breach both sides, and partly more than another part towards the outer protrusion size of the entry of explosion chamber, for long arc end of advancing, corresponding above-mentioned another part is short arc end of advancing.
When the resistance reducing grid pieces are applied, the resistance reducing grid pieces are arranged one by one, and the long arc inlet ends and the short arc inlet ends of two adjacent resistance reducing grid pieces are alternately arranged, so that electric arcs are cut repeatedly in different time by the long arc inlet ends and the short arc inlet ends of the resistance reducing grid pieces when entering the arc extinguish chamber.
It can be seen that, the utility model provides a fall and hinder the grid piece and can reduce the resistance that electric arc got into the explosion chamber, improve the speed that electric arc got into the explosion chamber to improve electric arc and extinguish speed.
The utility model discloses still provide the circuit breaker of using the explosion chamber of above-mentioned falling resistance grid piece, using this explosion chamber, can reduce the resistance, make electric arc get into the explosion chamber fast inside, improve electric arc extinguishing speed.
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 these drawings without creative efforts.
Fig. 1 is a schematic structural diagram of a resistance-reducing grid plate according to an embodiment of the present invention;
fig. 2 is a structural diagram of arrangement of grid plates in the arc extinguish chamber according to an embodiment of the present invention;
fig. 3 is an assembly view of a first group of grid plates and a second group of grid plates in the arc extinguish chamber according to the embodiment of the invention;
fig. 4 is an assembly view of all grid plates in the arc extinguish chamber according to the embodiment of the invention;
FIG. 5 is a top view of the structure shown in FIG. 4;
fig. 6 is a schematic structural diagram of a second grid provided in an embodiment of the present invention;
fig. 7 is a three-dimensional structure diagram of the arc extinguish chamber provided by the embodiment of the invention;
fig. 8 is a front view of an arc extinguish chamber provided by an embodiment of the present invention;
FIG. 9 is a left side view of the arc chute of FIG. 8;
FIG. 10 is a bottom view of the arc chute of FIG. 8;
fig. 11 is an assembly schematic diagram of an arc extinguish chamber and a moving contact module in a circuit breaker according to an embodiment of the present invention;
wherein, in fig. 1-11:
a resistance-reducing grid sheet 101; a long arc-entering end 111; a notch 112; a short arc-in end 113; a first set of grid pieces 1; a second group of grid pieces 2; a third group of grid pieces 3; a region 4; first grids 21, 22, 23, 24; second gates 31, 32, 33, 34; a left arc-isolating side plate 102; a left gas production shield 103; an arc runner 104; a right arc-isolating side plate 105; a right gas production shield 106; the moving contact module 200.
Detailed Description
The embodiment of the utility model discloses fall and hinder grid piece, its tip border that corresponds with the explosion chamber entry is central to be equipped with the breach, and the part of this breach both sides is different towards the outer convex size of explosion chamber entry, be length respectively, short arc end of advancing, by falling the length that hinders the grid piece when making electric arc get into the explosion chamber, short arc end of advancing is in the not equidimension repeated cutting many times of not, compare in the mode of adjacent grid piece cutting electric arc simultaneously among the prior art, make electric arc cut earlier for longer electric arc section, reduce the resistance, ensure that electric arc continues to get into the inside cutting again of explosion chamber fast for shorter electric arc section, thereby improve electric arc extinguishing speed. The embodiment of the utility model provides a still openly use the explosion chamber of the above-mentioned falling and hinder grid piece, use the circuit breaker of this explosion chamber, can reduce the resistance, make electric arc get into the explosion chamber fast, improve electric arc extinguishing speed.
The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.
Referring to fig. 1 to 11, an embodiment of the present invention provides a resistance-reducing grid plate 101 of an arc extinguish chamber, wherein a notch 112 is formed in a central position of an edge of an end portion of the resistance-reducing grid plate 101 corresponding to an inlet of the arc extinguish chamber, the end portion is located in portions on both sides of the notch 112, a protrusion dimension of one portion of the end portion is larger than that of the other portion of the end portion, the other portion of the end portion protrudes out of the inlet of the arc extinguish chamber, and the other portion of the end portion is a short arc-entering end 113 correspondingly to a long arc-entering end 111. The entrance to the arc chute is an opening for the entry of an arc.
When the resistance reducing grid pieces 101 are applied, the resistance reducing grid pieces 101 are arranged one by one, and the long arc inlet ends 111 and the short arc inlet ends 113 of two adjacent resistance reducing grid pieces 101 are alternately arranged, so that when electric arcs enter the arc extinguish chamber, the long arc inlet ends 111 and the short arc inlet ends 113 of the resistance reducing grid pieces 101 repeatedly cut for many times at different time.
Therefore, the resistance-reducing grid piece provided by the embodiment can reduce the resistance of the electric arc entering the arc extinguish chamber, and improve the speed of the electric arc entering the arc extinguish chamber, so that the electric arc extinguishing speed is improved.
The embodiment of the utility model also provides an arc extinguish chamber, which is used for a breaker and comprises a plurality of grid sheets which are arranged in a layered manner, wherein each grid sheet comprises a plurality of first grid sheets, and the first grid sheets are resistance reducing grid sheets 101 provided by the embodiment; the first grid pieces are arranged one by one, and the long arc inlet ends 111 and the short arc inlet ends 113 of two adjacent first grid pieces are alternately arranged, for example: the long arc-feeding end 111 of one first grid is positioned on the left side of the arc-extinguishing chamber, the short arc-feeding end 113 is positioned on the right side of the arc-extinguishing chamber, the long arc-feeding end 111 of the adjacent first grid is positioned on the right side of the arc-extinguishing chamber, and the short arc-feeding end 113 is positioned on the left side of the arc-extinguishing chamber. The grid sheet layered arrangement means that adjacent grid sheets are arranged at intervals, and the surfaces of the adjacent grid sheets are in a surface-to-surface opposite state.
The arc extinguish chamber further comprises a second grid piece, a notch 112 is formed in the second grid piece at the edge of the end part corresponding to the inlet of the arc extinguish chamber, and the parts of the end part, located on two sides of the notch 112, are symmetrical to each other.
The grid pieces are divided into a plurality of groups along the layered arrangement direction; in the two adjacent groups, the gap size of the adjacent grid pieces in one group of grid pieces which firstly contact the electric arc generated by the circuit breaker (namely in one group of grid pieces close to the static contact module of the circuit breaker in the two adjacent groups) is larger. Specifically, two ends of the arc extinguish chamber along the layered arrangement direction of the grid plates are respectively a rear end and a front end, as shown in fig. 2; the rear end of the arc extinguish chamber is close to a static contact module of the circuit breaker; when the circuit breaker is opened, the moving contact module is gradually far away from the static contact module, the electric arc moves along with the moving contact module and has a moving state from the rear end to the front end of the arc extinguish chamber, and therefore grid pieces close to the rear end in the arc extinguish chamber are in contact with the electric arc firstly.
Specifically, in the arc extinguish chamber, the gap size of any two adjacent grid plates in each group of grid plates is the same.
In the explosion chamber that this embodiment provided, the bars piece is the arrangement form of sparse preceding density in back, so the design has following advantage: when the moving contact module and the static contact module of the circuit breaker are separated, the temperature rises rapidly, the generated metal particles are large, the distance between the adjacent grid pieces at the rear end (namely the end part close to the static contact module) of the arc extinguish chamber is large, the grid pieces can be prevented from being blocked, the phenomenon that only one grid piece is used after two or more grid pieces are connected in series due to the blockage is avoided, the reduction of the number of the grid pieces for cutting electric arcs is avoided, and the electric arc voltage is improved.
In the arc extinguish chamber, the grid plates are divided into three groups, and the first group of grid plates 1, the second group of grid plates 2 and the third group of grid plates 3 are sequentially arranged along the sequence of contact arcs (namely along the direction from the rear end to the front end of the arc extinguish chamber). The first group of grid pieces 1 and the second group of grid pieces 2 both adopt first grid pieces (namely, resistance-reducing grid pieces 101), and the third group of grid pieces 3 adopt second grid pieces.
The long arc-advancing ends 111 and the short arc-advancing ends 113 of the grid pieces in the first and second groups are alternately arranged, as shown in fig. 3. The long arc-advancing ends 111 and the short arc-advancing ends 113 of the first grids 21, 22, 23, 24 and the like in the second group of grids 2 are alternately arranged along the front and back directions of the arc extinguish chamber.
The third group of grid plates 3 accounts for about one third of the total number of grid plates.
The distance between adjacent grid plates in the third group of grid plates 3 is designed to be small about 1/3, because the electric arc energy is gradually weakened along with the separation of the movable and static contact modules, the generated metal particles are small, the third group of grid plates 3 are not easy to block, the distance between the grid plates is designed to be small, the unnecessary distance can be divided into regions needing to increase the distance between the grid plates, the design according to requirements is realized, the effect of each grid plate is fully exerted, the distance between the grid plates at the rear end is increased according to the requirements on the basis of not reducing the total number of the grid plates in the arc extinguish chamber with the same structure, the resistance of the electric arc entering the arc extinguish chamber is reduced, the electric arc is cut into more sections, and the electric arc extinguishing effect is improved.
The length of each grid plate in the third group of grid plates 3 is gradually reduced along the sequence of contacting the electric arc (i.e. along the direction from the rear end to the front end of the arc extinguish chamber), as shown in fig. 4, the length of the second grid plate 31, the second grid plate 32, the second grid plate 33 and the second grid plate 34 in the third group of grid plates 3 is gradually reduced, so that the design can reduce the resistance of the electric arc entering the arc extinguish chamber, effectively cut the electric arc, increase the electric arc voltage and quickly extinguish the electric arc. The length of the grid is the size from one end of the grid corresponding to the inlet of the arc-extinguishing chamber to the other opposite end, namely the length of the grid is the size of the grid along the vertical direction shown in figure 2.
In the arc extinguish chamber, the ends of the grid plates corresponding to the inlets of the arc extinguish chamber are arranged into an arc shape one by one, and the shape of the arc is consistent with the shape of the moving track of the moving contact module in the circuit breaker, such as the shape of the end of each grid plate corresponding to the inlet of the arc extinguish chamber in the area 4 in fig. 2. Specifically, the long arc-entering ends 111 of the first grid plate of the plurality of grid plates are arranged in an arc shape.
The ends of the grid pieces corresponding to the inlets of the arc extinguish chambers are arranged according to the movement track of the movable contact module, so that when the movable contact module is far away from the static contact module, the same distance is kept between the movable contact module and the ends of the grid pieces corresponding to the inlets of the arc extinguish chambers as far as possible, the resistance of electric arcs entering the arc extinguish chambers is reduced, the effect of each grid piece is fully exerted, and the effect of quickly extinguishing the arcs is achieved.
The plurality of grid pieces include one or more second grid pieces in a first set of grid pieces 1, a second set of grid pieces 2 and a third set of grid pieces 3, and the embodiment is not limited, and the design can be specifically carried out according to the motion track of the movable contact module.
In the arc extinguish chamber, the grid pieces are parallel to each other; the arc extinguishing chamber comprises a back plate, a left arc isolating side plate 102 fixed on the back plate, and a right arc isolating side plate 105 fixed on the back plate; the two arc-isolating side plates are arranged in parallel and are respectively vertical to the back plate; the grid sheet is fixed on the two arc-isolating side plates and is vertical to the back plate. The arc extinguish chamber also comprises an arc striking plate 104, a left gas production protective cover and a right gas production protective cover; the arc striking plate 104 is fixed at the front ends of the arc isolating side plates and the front end of the back plate; the left gas production shield 103 is fixed on the left arc-isolating side plate 102 and covers the left sides of all the grid pieces, and the right gas production shield 106 is fixed on the right arc-isolating side plate 105 and covers the right sides of all the grid pieces.
The explosion chamber that this embodiment provided can make electric arc get into this explosion chamber fast inside, makes the grid piece in time cut electric arc to improve arc voltage, force direct current electric arc to extinguish rapidly, this explosion chamber also can solve the problem that direct current undercurrent put out the arc difficulty simultaneously, thereby reach the effect that improves circuit breaker breaking capacity and promote the contact life-span.
The embodiment of the utility model provides an explosion chamber uses the fall that above-mentioned embodiment provided to hinder grid piece 101, can reduce the resistance, makes electric arc get into the explosion chamber fast, improves electric arc extinguishing speed.
The embodiment of the utility model also provides a circuit breaker, which comprises a shell, and an arc extinguish chamber, a movable contact module and a fixed contact module which are respectively arranged in the shell, wherein the arc extinguish chamber is the arc extinguish chamber provided by the embodiment; the static contact module is close to the rear end of the arc extinguish chamber.
The circuit breaker can be set as a direct current circuit breaker or an alternating current circuit breaker, and the embodiment is not limited.
The circuit breaker that this embodiment provided uses the explosion chamber that above-mentioned embodiment provided, can reduce the resistance, makes electric arc get into the explosion chamber fast, improves electric arc extinguishing speed. Of course, the circuit breaker provided in this embodiment further has other effects related to the arc extinguishing chamber provided in the above embodiments, and details are not described herein again.
The embodiments in the present description are described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments are referred to each other.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (10)
1. The utility model provides a falling of explosion chamber hinders bars piece, its characterized in that falls in hindering the bars piece with the border of the tip that the entry of explosion chamber corresponds is centrally located to be equipped with the breach, and this tip is located in the two parts of breach both sides, partly than another part court the outer protrusion size of entry of explosion chamber is more, for the arc end is advanced to the length, another part is the short arc end of advancing.
2. An arc chute, used for circuit breaker, comprising a plurality of grid sheets arranged in layers, wherein the grid sheets comprise a plurality of first grid sheets, and the first grid sheets are the resistance-reducing grid sheets of claim 1; the first grid pieces are arranged one by one, and the long arc inlet ends and the short arc inlet ends of every two adjacent first grid pieces are alternately arranged.
3. The arc extinguish chamber according to claim 2, further comprising a second grid, wherein a notch is formed in the second grid at the central position of the edge of the end part corresponding to the inlet of the arc extinguish chamber, and the parts of the end part, which are positioned at two sides of the notch, are symmetrical to each other.
4. The arc extinguishing chamber according to claim 3, characterized in that the grid pieces are divided into a plurality of groups along the direction of the layered arrangement; in the two adjacent groups, the gap size of the adjacent grid sheet in the grid sheet of one group which firstly contacts the electric arc generated by the circuit breaker is larger.
5. The arc chute according to claim 4, characterized in that the gap size of any two adjacent grids in each group of grids is the same.
6. The arc extinguish chamber according to claim 4, wherein the grid plates are divided into three groups, and the first, second and third groups of grid plates are sequentially arranged along the sequence of contacting the electric arc; the first group of grid pieces and the second group of grid pieces adopt the first grid pieces respectively; the third group of grid pieces adopt the second grid pieces.
7. The arc chute of claim 6, wherein the length of each of the grid pieces in the third set gradually decreases in the sequential order of contacting the arc; the length of the grid piece is from one end of the grid piece corresponding to the opening of the arc extinguish chamber to the other end of the grid piece.
8. The arc extinguish chamber according to claim 2, wherein the ends of the grid plates corresponding to the inlets of the arc extinguish chamber are arranged in an arc shape one by one, and the shape of the arc shape is consistent with the shape of the moving track of the moving contact module in the circuit breaker.
9. The arc chute of claim 2 wherein each of said grids are parallel to each other; the arc extinguishing chamber comprises a back plate, a left arc isolating side plate fixed on the back plate and a right arc isolating side plate fixed on the back plate; the grid pieces are fixed on the two arc isolating side plates and are perpendicular to the back plate.
10. A circuit breaker comprises a shell, and an arc extinguish chamber, a moving contact module and a static contact module which are respectively arranged in the shell, and is characterized in that the arc extinguish chamber is the arc extinguish chamber according to any one of claims 2 to 9; the static contact module is close to the rear end of the arc extinguish chamber.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202222162348.3U CN217881385U (en) | 2022-08-16 | 2022-08-16 | Circuit breaker, arc extinguish chamber and resistance-reducing grid piece thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202222162348.3U CN217881385U (en) | 2022-08-16 | 2022-08-16 | Circuit breaker, arc extinguish chamber and resistance-reducing grid piece thereof |
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| Publication Number | Publication Date |
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| CN217881385U true CN217881385U (en) | 2022-11-22 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202222162348.3U Active CN217881385U (en) | 2022-08-16 | 2022-08-16 | Circuit breaker, arc extinguish chamber and resistance-reducing grid piece thereof |
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| Country | Link |
|---|---|
| CN (1) | CN217881385U (en) |
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- 2022-08-16 CN CN202222162348.3U patent/CN217881385U/en active Active
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