Arc extinguish chamber and circuit breaker

Abstract

The invention provides an arc extinguish chamber and a circuit breaker, the arc extinguish chamber comprises a shell, an arc guide sheet and a first arc extinguishing grid sheet assembly, a first arc inlet channel is arranged on a first side wall of the shell, the arc guide sheet covers the inner wall surface of the shell wall of the first side wall, an air inlet channel is formed between a first arc extinguishing grid sheet group of the first arc extinguishing grid sheet assembly and the arc guide sheet, and a second arc inlet channel is formed between the arc guide sheet and the first arc extinguishing grid sheet assembly. At least part of the first arc extinguishing grid sheets in the first arc extinguishing grid sheet group are provided with first discharge sharp corners, the arc guide sheet is provided with second discharge sharp corners, the first discharge sharp corners and the second discharge sharp corners form a continuous discharge path, and the current direction of the discharge path is consistent with the flowing direction of gas in the gas inlet channel. According to the point discharge principle, electric arcs can transmit current in the direction far away from the first electric arc entering channel through the first discharge sharp corner and the second discharge sharp corner, so that more electric arcs flow to the first arc extinguishing grid plate far away from one side of the first electric arc entering channel, and the electric arcs are prevented from being excessively accumulated at the front part of the arc extinguishing chamber; and the possibility of burning the front part of the arc extinguish chamber is reduced.

Description

Technical Field

[0001] The present invention relates to the field of low-voltage electrical appliances, and in particular to an arc extinguishing chamber and a circuit breaker. Background Art

[0002] Circuit breakers are key devices for achieving circuit switching and can provide electrical protection in circuits. When encountering an abnormally large current, the circuit breaker can quickly disconnect and cut off the current. During the disconnection process, the air medium between the moving and static contacts discharges under the action of voltage, an arc is drawn between the moving and static contacts, and high-temperature gas is generated during the disconnection process. If the arc continues to burn, it will generate huge energy, which may cause the circuit breaker to burn out. Circuit breakers are usually equipped with an arc extinguishing chamber for extinguishing the arc. The gas generated during disconnection blows the arc into the arc extinguishing chamber, causing the arc extinguishing grid in the arc extinguishing chamber to cut the arc, thereby extinguishing the arc.

[0003] However, in actual tests, the arc often accumulates at the front of the arc extinguishing chamber and cannot move backward to enter more arc extinguishing grids, resulting in low utilization of the arc extinguishing grids at the rear of the arc extinguishing chamber. The arc extinguishing grids at the front of the arc extinguishing chamber accumulate too much heat, which can easily cause the arc extinguishing chamber to burn out and reduce the service life of the arc extinguishing chamber. Summary of the Invention

[0004] The technical problem to be solved by the present invention is to overcome the defect in the prior art that arcs are easily accumulated in the front of the arc extinguishing chamber, resulting in excessive heat accumulation in the arc extinguishing grid located in the front of the arc extinguishing chamber and reducing the service life of the arc extinguishing chamber, and to provide an arc extinguishing chamber and a circuit breaker.

[0005] The present invention solves the above technical problems through the following technical solutions:

[0006] An arc extinguishing chamber comprises a shell, an arc guide plate, and a first arc extinguishing grid assembly arranged inside the shell, wherein a first arc entry channel is provided on a first side wall of the shell, the arc guide plate covers an inner wall surface of the shell wall of the first side wall and is detachably connected to the shell, the first arc extinguishing grid assembly comprises a first arc extinguishing grid group arranged opposite to the shell wall, the first arc extinguishing grid group comprises a plurality of first arc extinguishing grids arranged at intervals, the first arc extinguishing grid group and the arc guide plate form an air inlet channel in a first direction, the first direction being the wall thickness direction of the first side wall, at least some of the first arc extinguishing grids in the first arc extinguishing grid group are provided with a first discharge sharp corner, and the arc guide plate is provided with a second discharge sharp corner on an end surface facing the first arc extinguishing grid group, the first discharge sharp corner and the second discharge sharp corner form a continuous discharge path, and the current direction of the discharge path is consistent with the flow direction of gas in the air inlet channel.

[0007] In this solution, based on the principle of pointed discharge, the tips of the first and second discharge corners facilitate arc concentration. This allows the arc to propagate current through the first and second discharge corners in a direction away from the first arc entry channel, allowing more arc to flow toward the first arc-quenching grids located away from the first arc entry channel. This improves the utilization of the first arc-quenching grids at the rear of the arc extinguishing chamber, prevents excessive arc accumulation on the first arc-quenching grids near the first arc entry channel, reduces the likelihood of burning at the front of the arc extinguishing chamber, and increases the service life of the arc extinguishing chamber. The gas within the air inlet channel not only accelerates arc propagation but also blows the arc into the area between the two first arc-quenching grids, allowing the first arc-quenching grids to interrupt the arc.

[0008] Preferably, the first discharge corner is provided at one end of the first arc-extinguishing grid facing the first side wall, and the tip of the first discharge corner and the tip of the second discharge corner are arranged opposite to each other in the first direction;

[0009] There are multiple first discharge sharp corners and multiple second discharge sharp corners, which are alternately arranged in sequence in the second direction, where the second direction is the direction in which the multiple first arc-extinguishing grids are spaced apart.

[0010] In this solution, the above arrangement facilitates continuous transfer of the arc, and the staggered arrangement of the first discharge corner and the second discharge corner can avoid the arc accumulating between the oppositely arranged first discharge corner and the second discharge corner, causing the arc to be unable to transfer backward.

[0011] Preferably, the second discharge corner is provided between two adjacent first arc-extinguishing grids in the second direction, and both two adjacent first arc-extinguishing grids in the second direction are provided with the first discharge corner.

[0012] In this solution, the above arrangement can shorten the distance between the adjacent first discharge corners and the second discharge corners in the second direction, thereby improving the success rate of arc transfer.

[0013] Preferably, in the second direction, the distances between the tip of the second discharge corner and two adjacent first discharge corners in the second direction are the same.

[0014] In this solution, by limiting the equidistant layout of the second discharge corner and the adjacent first discharge corner, the arc transfer success rate can be improved while the electric field strength can be made uniform, preventing arc deflection or reignition and improving arc extinguishing stability.

[0015] Preferably, the first discharge sharp angle and the second discharge sharp angle at least partially overlap in the third direction;

[0016] The third direction is perpendicular to a plane formed by the first direction and the second direction.

[0017] In this solution, the above arrangement can shorten the distance between the adjacent first discharge corners and the second discharge corners, thereby improving the success rate of arc transfer.

[0018] Preferably, the first discharge corner extends along the second direction, and two inclined surfaces of the first discharge corner in the third direction intersect to form a tip of the first discharge corner;

[0019] And / or, the first discharge corner extends along the third direction, and two inclined surfaces of the first discharge corner in the second direction intersect to form a tip of the first discharge corner.

[0020] In this solution, two shapes of the first discharge corners are provided. By increasing the length of the first discharge corners, more arcs can be gathered, so that more arcs can be transmitted backward, thereby improving the utilization rate of the first arc extinguishing grid at the rear of the arc extinguishing chamber, preventing excessive accumulation of arcs at the front of the arc extinguishing chamber, and improving the service life of the arc extinguishing chamber.

[0021] Preferably, the second discharge corner extends along the third direction, and two inclined surfaces of the second discharge corner in the second direction intersect to form a tip of the second discharge corner;

[0022] And / or, the second discharge corner extends along the second direction, and two inclined surfaces of the second discharge corner in the third direction intersect to form a tip of the second discharge corner.

[0023] In this solution, two shapes of the second discharge corners are provided. By increasing the length of the second discharge corners, more arcs can be gathered, so that more arcs can be transmitted backward, thereby improving the utilization rate of the first arc extinguishing grid at the rear of the arc extinguishing chamber, preventing excessive accumulation of arcs at the front of the arc extinguishing chamber, and improving the service life of the arc extinguishing chamber.

[0024] Preferably, the first discharge corner extends along the second direction, and two inclined surfaces of the first discharge corner in the third direction intersect to form a tip of the first discharge corner;

[0025] The first discharge horn includes a plurality of first discharge horn units sequentially arranged along the third direction, and the second discharge horn includes a plurality of second discharge horn units sequentially arranged along the third direction. The number of the first discharge horn units in a single first discharge horn is the same as the number of the second discharge horn units in a single second discharge horn, and the units are arranged in a one-to-one correspondence.

[0026] The third direction is perpendicular to a plane formed by the first direction and the second direction.

[0027] In this solution, a current can be formed between each first discharge corner unit and the second discharge corner unit. The above-mentioned setting divides the arc into multiple currents for transmission, while improving the current transmission efficiency, it can also prevent the local arcs of the first discharge corner and the second discharge corner from being too concentrated and easily burned.

[0028] Preferably, the second discharge corner extends along the third direction, and two inclined surfaces of the second discharge corner in the second direction intersect to form a tip of the second discharge corner;

[0029] The width of the first discharge corner unit in the third direction is equal to the length of the corresponding second discharge corner unit in the third direction.

[0030] In this solution, the above-mentioned setting makes the amount of arc that can be gathered by the adjacent first discharge corner and the second discharge corner roughly the same, reducing the loss during the arc transmission process, so that more arc can be transmitted backward, improving the utilization rate of the first arc extinguishing grid at the rear of the arc extinguishing chamber, preventing excessive accumulation of arcs at the front of the arc extinguishing chamber, and improving the service life of the arc extinguishing chamber.

[0031] Preferably, a first groove is provided on the first arc-extinguishing grid, and the first groove passes through the first arc-extinguishing grid at both ends in the second direction and at one end in the first direction facing the first side wall, and the first discharge corner is fixed to the bottom of the first groove.

[0032] In this solution, the above setting can increase the size of the air inlet channel in the first direction to reduce the flow resistance of the gas in the air inlet channel, so that more gas can enter the air inlet channel and more arcs can be blown into the air inlet channel by the gas.

[0033] Preferably, the first discharge corner extends along the second direction, and two inclined surfaces of the first discharge corner in the third direction intersect to form a tip of the first discharge corner, and the third direction is perpendicular to a plane formed by the first direction and the second direction;

[0034] Both end surfaces of the first discharge corner in the second direction are flush with both end surfaces of the first arc-extinguishing grid in the second direction.

[0035] In this solution, the above arrangement can, on the one hand, prevent gas from accumulating in the first groove to form airflow turbulence, thereby ensuring smooth arc transmission; on the other hand, it can also prevent the arc from accumulating in the first groove, resulting in heat not being easily dissipated and burning the first arc-extinguishing grid.

[0036] Preferably, the first discharge corner is provided with second grooves on both sides in the third direction, the bottom of the first groove is recessed along the first direction away from the first side wall to form the second groove, and both ends of the second groove in the second direction pass through the first arc-extinguishing grid.

[0037] In this solution, the above arrangement can increase the distance between the first arc-extinguishing grid and the first sidewall on both sides of the first discharge corner, making it easier for the arc to converge at the tip of the first discharge corner. The two ends of the second groove are connected, which can also prevent gas and arc accumulation.

[0038] Preferably, the first arc-quenching grid assembly further includes a second arc-quenching grid group arranged opposite to the first arc entry channel, the second arc-quenching grid group includes a plurality of first arc-quenching grids arranged at intervals, and at least some of the first arc-quenching grids in the second arc-quenching grid group close to the first arc-quenching grid group are provided with the first discharge sharp corner.

[0039] In this solution, the above-mentioned setting can increase the amount of arc entering the air inlet channel, thereby being able to transmit more arcs backward, improving the utilization rate of the first arc extinguishing grid at the rear of the arc extinguishing chamber, preventing excessive accumulation of arcs at the front of the arc extinguishing chamber, and improving the service life of the arc extinguishing chamber.

[0040] A circuit breaker comprises the arc extinguishing chamber described above.

[0041] In this solution, the circuit breaker is used to realize the switching of the circuit and play an electrical protection role in the circuit. The use of the arc extinguishing chamber described above can improve the breaking capacity and service life of the circuit breaker.

[0042] Preferably, the circuit breaker includes a first arc extinguishing chamber and a second arc extinguishing chamber, the first arc extinguishing chamber is connected to the second arc extinguishing chamber, the direction of the first arc entering channel of the first arc extinguishing chamber and the direction of the second arc entering channel of the second arc extinguishing chamber form an angle, the first arc extinguishing chamber is the above-mentioned arc extinguishing chamber, and the static contact of the circuit breaker is arranged on the first arc extinguishing chamber.

[0043] In this solution, the design of double arc extinguishing chambers can achieve energy diversion and improve arc extinguishing capability.

[0044] The present invention has the following positive effects: based on the principle of tip discharge, the tips of the first and second discharge corners facilitate arc convergence. As a result, the arc can transmit current through the first and second discharge corners in a direction away from the first arc entry channel, allowing more arc to flow toward the first arc-quenching grids on the side away from the first arc entry channel. This improves the utilization rate of the first arc-quenching grids at the rear of the arc extinguishing chamber, prevents excessive arc accumulation on the first arc-quenching grids near the first arc entry channel, reduces the possibility of burning at the front of the arc extinguishing chamber, and increases the service life of the arc extinguishing chamber. The gas in the air inlet channel not only accelerates arc propagation but also blows the arc into the area between the two first arc-quenching grids, causing the first arc-quenching grids to interrupt the arc. BRIEF DESCRIPTION OF THE DRAWINGS

[0045] Figure 1 This is a schematic diagram of the internal structure of the circuit breaker when the static contact and the moving contact are closed and connected according to Example 1 of the present invention.

[0046] Figure 2 This is a schematic diagram of the internal structure of the circuit breaker after the static contact and the moving contact of Example 1 of the present invention are disconnected.

[0047] Figure 3 This is a schematic diagram of the three-dimensional structure of the first arc extinguishing chamber of Example 1 of the present invention.

[0048] Figure 4 This is a schematic diagram of the internal structure of the first arc extinguishing chamber of Example 1 of the present invention.

[0049] Figure 5 This is another schematic diagram of the internal structure of the first arc extinguishing chamber of Example 1 of the present invention.

[0050] Figure 6 Schematic diagram of the positional relationship between the first discharge corner and the second discharge corner in accordance with the first embodiment of the present invention.

[0051] Figure 7 Schematic diagram of the positional relationship between the first arc-extinguishing grid and the second discharge corner in Example 1 of the present invention.

[0052] Figure 8 This is a schematic side view of the first arc-extinguishing grid according to Example 1 of the present invention.

[0053] Figure 9 Schematic diagram of the positional relationship between the first arc-extinguishing grid and the second discharge corner in accordance with the second embodiment of the present invention.

[0054] Figure 10 Schematic diagram of the extension direction of the first discharge corner and the second discharge corner in embodiment 3 of the present invention.

[0055] Figure 11Schematic diagram of the extension direction of the first discharge corner and the second discharge corner in embodiment 4 of the present invention.

[0056] Figure 12 Schematic diagram of the extension direction of the first discharge corner and the second discharge corner in embodiment 5 of the present invention.

[0057] Figure 13 Schematic diagram of the cross section of the second discharge corner according to embodiment 6 of the present invention.

[0058] Description of reference numerals:

[0059] Static contact 11

[0060] Moving contact 12

[0061] First interrupter 2

[0062] The first arc extinguishing chamber 21

[0063] First air outlet 22

[0064] Intake channel 23

[0065] Second arc extinguishing chamber 3

[0066] Second arc extinguishing chamber 31

[0067] The second arc extinguishing grid assembly 32

[0068] Second arc extinguishing grid 321

[0069] Second air outlet 33

[0070] The first arc quenching grid assembly 4

[0071] The first arc extinguishing grid group 41

[0072] The second arc extinguishing grid group 42

[0073] The first arc quenching grid 43

[0074] The first arc enters the channel 51

[0075] The second arc enters the channel 52

[0076] Shell 6

[0077] First side wall 61

[0078] Second side wall 62

[0079] First discharge corner 7

[0080] The first discharge corner unit 71

[0081] Second discharge tip 8

[0082] The second discharge corner unit 81

[0083] First side 82

[0084] Second side 83

[0085] Current collecting end face 84

[0086] Arc guide 9

[0087] First groove 101

[0088] Second groove 102 DETAILED DESCRIPTION

[0089] The present invention is further described below by way of examples, but the present invention is not limited to the scope of the examples.

[0090] Example 1

[0091] like Figure 1 and Figure 2 As shown, this embodiment discloses a circuit breaker for realizing circuit on-off and playing an electrical protection role in the circuit. Specifically, the circuit breaker includes an arc extinguishing chamber and a contact mechanism, and the contact mechanism includes a static contact 11 and a moving contact 12. When the circuit operates normally, the static contact 11 and the moving contact 12 are closed and connected to realize the normal transmission of current. When a short circuit or overload occurs in the circuit, the static contact 11 and the moving contact 12 are separated, and the air medium between the static contact 11 and the moving contact 12 is discharged under the action of voltage, thereby generating an arc between the static contact 11 and the moving contact 12. A large amount of gas is also generated when the static contact 11 and the moving contact 12 are separated, and the arc flows into the arc extinguishing chamber under the guidance of the gas for disconnection to realize the arc extinguishing operation.

[0092] like Figure 1 and Figure 2 As shown, the arc extinguishing chamber in this embodiment is divided into a first arc extinguishing chamber 2 and a second arc extinguishing chamber 3. The first arc extinguishing chamber 2 has a first arc extinguishing cavity 21, and a first arc extinguishing grid assembly 4 is disposed inside the first arc extinguishing cavity 21 to interrupt the arc. The second arc extinguishing chamber 3 has a second arc extinguishing cavity 31, and a second arc extinguishing grid assembly 32 is disposed inside the second arc extinguishing cavity 31 to interrupt the arc. Among them, the static contact 11 is arranged at one end of the first arc extinguishing chamber 2 provided with the first arc entrance channel 51, so that the direction of the second arc entrance channel 52 of the second arc extinguishing chamber 3 is opposite to the contact mechanism, the direction of the first arc entrance channel 51 of the first arc extinguishing chamber 2 is perpendicular to the direction of the second arc entrance channel 52 of the second arc extinguishing chamber 3, the first arc extinguishing chamber 21 of the first arc extinguishing chamber 2 and the second arc extinguishing chamber 31 of the second arc extinguishing chamber 3 are connected, and the arc and gas generated by the disconnection of the static contact 11 and the moving contact 12 are divided into two streams and flow into the first arc extinguishing chamber 21 and the second arc extinguishing chamber 31 respectively. The design of the double arc extinguishing chamber can realize energy diversion and improve the arc extinguishing ability.

[0093] Specifically, if Figure 1 and Figure 2 As shown, the lower end of the second arc-extinguishing chamber 3 is open to form a second arc entrance channel 52, that is, the direction of the second arc entrance channel 52 of the second arc-extinguishing chamber 3 is parallel to the vertical direction. The second arc-extinguishing grid assembly 32 in the second arc-extinguishing chamber 3 includes a plurality of second arc-extinguishing grids 321 arranged at intervals in the horizontal direction. Part of the arc and gas enter the second arc-extinguishing chamber 31 through the second arc entrance channel 52 at the lower end of the second arc-extinguishing chamber 3. The arc is broken by the plurality of second arc-extinguishing grids 321, and the gas can be discharged from the second arc-extinguishing chamber 31 through the second gas outlet 33 at the upper end of the second arc-extinguishing chamber 3.

[0094] like Figure 1 and Figure 2 As shown, the first arc entrance channel 51 of the first arc extinguishing chamber 2 is provided at the upper end of the first arc extinguishing chamber 2 and is located on the side of the first arc extinguishing chamber 2 facing the second arc extinguishing chamber 3 in the horizontal direction, that is, the direction of the first arc entrance channel 51 of the first arc extinguishing chamber 2 is parallel to the horizontal direction, and the first arc extinguishing grid assembly 4 in the first arc extinguishing chamber 2 includes a plurality of first arc extinguishing grids 43 arranged at intervals in the vertical direction. Another part of the arc and gas enter the first arc extinguishing cavity 21 through the first arc entrance channel 51 on the side wall of the first arc extinguishing chamber 2. The arc is broken by the plurality of first arc extinguishing grids 43, and the gas can be discharged from the first arc extinguishing cavity 21 through the first gas outlet 22 at the lower end of the first arc extinguishing chamber 2.

[0095] In other alternative embodiments, the orientation of the first arc entry channel 51 of the first arc extinguishing chamber 2 and the orientation of the second arc entry channel 52 of the second arc extinguishing chamber 3 are not limited to being perpendicular, as long as the orientation of the first arc entry channel 51 of the first arc extinguishing chamber 2 and the orientation of the second arc entry channel 52 of the second arc extinguishing chamber 3 form an angle.

[0096] like Figure 1-Figure 4 As shown, the first arc extinguishing chamber 2 includes a shell 6, an arc guide plate 9 and a first arc extinguishing grid assembly 4. The interior of the shell 6 forms the first arc extinguishing chamber 2. The first arc extinguishing grid assembly 4 is arranged in the first arc extinguishing chamber 2 for interrupting the arc flowing into the first arc extinguishing cavity 21.

[0097] Specifically, if Figure 4 As shown, the housing 6 includes a first side wall 61 and a second side wall 62 arranged opposite to each other in the horizontal direction. The first arc entry channel 51 of the first arc extinguishing chamber 2 is provided on the first side wall 61 of the housing 6. The first side wall 61 is a side wall facing the second arc extinguishing chamber 3 in the horizontal direction. The first arc entry channel 51 is provided at the upper end of the first side wall 61. The first arc extinguishing grid assembly 4 in the first arc extinguishing chamber 2 includes a plurality of arc extinguishing grids arranged along the second direction (i.e., the vertical direction). Figure 4The first arc-quenching grids 43 are spaced apart (in the Y direction in FIG. 2 ), and a plurality of the first arc-quenching grids 43 are fixed to the second side wall 62. Specifically, a plurality of the first arc-quenching grids 43 disposed opposite the shell wall of the first side wall 61 constitute a first arc-quenching grid group 41, and a plurality of the first arc-quenching grids 43 disposed opposite the first arc entry channel 51 of the first arc-quenching chamber 2 constitute a second arc-quenching grid group 42. That is, the first arc-quenching grid group 41 and the second arc-quenching grid group 42 are adjacent in the vertical direction, and the first arc-quenching grid group 41 is located below the second arc-quenching grid group 42.

[0098] It should be noted that the number of the first arc-quenching grids 43 included in the first arc-quenching grid group 41 and the second arc-quenching grid group 42 is not specifically limited and is designed according to actual conditions.

[0099] like Figure 5 and Figure 7 As shown, the portion of the arc guide 9 extending into the first arc extinguishing chamber 2 covers the inner wall surface of the first side wall 61 and is detachably connected to the housing 6. The arc guide 9 extends to the exterior of the housing 6 through the first arc entry channel 51, and the static contact 11 is disposed in the portion of the arc guide 9 located outside the housing 6. The arc guide 9 is made of metal and can isolate the housing 6 from direct erosion by the arc, thereby extending the service life of the housing 6. The arc guide 9 is detachably connected to the housing 6, enabling individual maintenance and replacement of the arc guide 9, reducing maintenance and replacement costs.

[0100] like Figure 4 As shown, the arc guide plate 9 and the first arc extinguishing grid plate group 41 are arranged in a first direction (ie, the wall thickness direction of the first side wall 61). Figure 4 An air inlet channel 23 is formed in the X direction (in the X direction) to allow the electric arc and gas to flow. Within the air inlet channel 23, gas propels the arc toward the spaces between the plurality of first arc-quenching grids 43, thereby enabling the first arc-quenching grids 43 to interrupt the arc. After passing through the first arc-quenching grid group 41, the gas is discharged from the first arc-quenching chamber 21 through the first gas outlet 22 at the lower end of the housing 6.

[0101] like Figure 5 and Figure 6 As shown, at least some of the first arc-extinguishing grids 43 in the first arc-extinguishing grid group 41 are provided with a first discharge sharp corner 7, and the arc guide plate 9 is provided with a second discharge sharp corner 8 on an end surface facing the first arc-extinguishing grid group 41 in the first direction. The first discharge sharp corner 7 and the second discharge sharp corner 8 form a continuous discharge path, and the current direction of the discharge path is consistent with the flow direction of the gas in the air inlet channel 23.

[0102] According to the principle of tip discharge, the tips of the first discharge corner 7 and the second discharge corner 8 are more likely to concentrate the arc. As a result, the arc can transmit current through the first discharge corner 7 and the second discharge corner 8 in a direction away from the first arc entry channel 51, allowing more arc to flow to the first arc-quenching grid 43 on the side away from the first arc entry channel 51. This improves the utilization rate of the first arc-quenching grid 43 at the rear of the arc extinguishing chamber, prevents excessive arc accumulation on the first arc-quenching grid 43 near the first arc entry channel 51, reduces the possibility of burning at the front of the arc extinguishing chamber, and increases the service life of the arc extinguishing chamber, thereby improving the breaking capacity and service life of the circuit breaker. The gas in the air inlet channel 23 not only accelerates the arc propagation speed, but also blows the arc into the area between the two first arc-quenching grids 43, allowing the first arc-quenching grid 43 to interrupt the arc.

[0103] like Figure 5 and Figure 6 As shown, the first discharge horn 7 is provided at one end of the first arc-quenching grid 43 facing the first sidewall 61 in the first direction. The tip of the first discharge horn 7 and the tip of the second discharge horn 8 are arranged opposite each other in the first direction to achieve continuous arc transfer. The second discharge horn 8 is provided between two adjacent first arc-quenching grids 43 in the second direction. Both first arc-quenching grids 43 adjacent to the second discharge horn 8 in the second direction are provided with the first discharge horn 7. This shortens the distance between adjacent first discharge horns 7 and second discharge horns 8 in the second direction, thereby improving the success rate of arc transfer.

[0104] Specifically, in this embodiment, all first arc-extinguishing grids 43 in the first arc-extinguishing grid group 41 are provided with a first discharge sharp corner 7, and a second discharge sharp corner 8 is provided between two adjacent first arc-extinguishing grids 43 in the first arc-extinguishing grid group 41. The multiple first discharge sharp corners 7 and the multiple second discharge sharp corners 8 are staggered in sequence in the second direction to avoid the situation where the arc is accumulated between the oppositely arranged first discharge sharp corners 7 and the second discharge sharp corners 8, causing the arc to be unable to be transmitted backward.

[0105] In other alternative embodiments, not all first arc-extinguishing grids 43 in the first arc-extinguishing grid group 41 may be provided with the first discharge corner 7, and not every second discharge corner 8 may be provided between two adjacent first arc-extinguishing grids 43. The positional layout of the first discharge corner 7 and the second discharge corner 8 only needs to ensure that the arc gathered at the first discharge corner 7 can be transferred to the second discharge corner 8 adjacent thereto.

[0106] Furthermore, in this embodiment, all the first arc extinguishing grids 43 in the second arc extinguishing grid group 42 are also provided with a first discharge sharp corner 7, so that the arc that has just entered the first arc extinguishing cavity 21 can be transferred under the principle of tip discharge, thereby increasing the amount of arc entering the air inlet channel 23, so that more arc can be transferred backward, thereby improving the utilization rate of the first arc extinguishing grid 43 at the rear of the arc extinguishing chamber, preventing excessive accumulation of arcs at the front of the arc extinguishing chamber, and improving the service life of the arc extinguishing chamber.

[0107] In other alternative embodiments, only the first arc-quenching grids 43 in the second arc-quenching grid group 42 adjacent to the first arc-quenching grid group 41 may be provided with the first discharge sharp corners 7. This can also achieve arc transfer based on the tip discharge principle for the arc that has just entered the first arc-quenching cavity 21. In this embodiment, all first arc-quenching grids 43 in the second arc-quenching grid group 42 are designed to be provided with the first discharge sharp corners 7. This eliminates the need to distinguish between first arc-quenching grids 43 belonging to the first arc-quenching grid group 41 and the second arc-quenching grid group 42 during installation, simplifying the assembly process.

[0108] like Figure 5 and Figure 6 As shown, in this embodiment, the first discharge corner 7 extends along the second direction, thereby increasing the length of the first discharge corner 7 in the second direction. The first discharge corner 7 extends in the third direction ( Figure 5 The two inclined surfaces in the Z direction (in the Z direction) intersect to form the tip of the first discharge horn 7. The second discharge horn 8 extends along the third direction, thereby increasing its length in the third direction. The two inclined surfaces of the second discharge horn 8 in the second direction intersect to form the tip of the second discharge horn 8. In this embodiment, the tips of the first discharge horn 7 and the second discharge horn 8 are both sharp points formed by the intersection of two inclined surfaces, which improves the current focusing effect. The third direction is perpendicular to the plane formed by the first and second directions, that is, the third direction is parallel to the horizontal plane.

[0109] In this embodiment, more arcs are gathered by increasing the length of the first discharge corner 7 and the second discharge corner 8, so that more arcs can be transmitted backward, thereby improving the utilization rate of the first arc extinguishing grid 43 at the rear of the arc extinguishing chamber, preventing excessive accumulation of arcs at the front of the arc extinguishing chamber, and improving the service life of the arc extinguishing chamber.

[0110] In this embodiment, the first discharge corner 7 is designed to extend along the second direction, which can shorten the distance between the first discharge corner 7 and the second discharge corner 8 and improve the success rate of arc transfer. In this embodiment, the second discharge corner 8 is designed to extend along the third direction to prevent the arc from being excessively retained on the second discharge corner 8, thereby allowing gas to blow the arc into the space between adjacent first arc-extinguishing grids 43. In other alternative embodiments, the first discharge corner 7 can extend along the third direction, with the two inclined surfaces of the first discharge corner 7 in the second direction intersecting to form the tip of the first discharge corner 7, or the second discharge corner 8 can extend along the second direction, with the two inclined surfaces of the second discharge corner 8 in the third direction intersecting to form the tip of the second discharge corner 8.

[0111] Further, if Figure 6 As shown, the first discharge corner 7 and the second discharge corner 8 at least partially overlap in the third direction, so as to shorten the distance between adjacent first discharge corners 7 and second discharge corners 8 and improve the success rate of arc transfer.

[0112] Specifically, if Figure 6 As shown, in this embodiment, the first discharge horn 7 includes two first discharge horn units 71 arranged sequentially along the third direction, and the second discharge horn 8 includes two second discharge horn units 81 arranged sequentially along the third direction. The two first discharge horn units 71 are arranged in a one-to-one correspondence with the two second discharge horn units 81, and a current can be generated between each first discharge horn unit 71 and the second discharge horn unit 81. By dividing the arc into multiple currents for transmission, this embodiment improves current transmission efficiency while also preventing the first discharge horn 7 and the second discharge horn 8 from being excessively concentrated and easily burned.

[0113] In this embodiment, both first discharge corner units 71 extend along the second direction, and both second discharge corner units 81 extend along the third direction. In other alternative embodiments, the extension directions of the multiple first discharge corner units 71 in a single first discharge corner 7 may be the same or different, and the extension directions of the multiple second discharge corner units 81 in a single second discharge corner 8 may be the same or different.

[0114] In other alternative embodiments, the number of first discharge corner units 71 in a single first discharge corner 7 and the number of second discharge corner units 81 in a single second discharge corner 8 can be one or more, as long as the number of first discharge corner units 71 in a single first discharge corner 7 is the same as the number of second discharge corner units 81 in a single second discharge corner 8 and they are arranged in a one-to-one correspondence. To increase the amount of arc transfer, the number of first discharge corner units 71 in a single first discharge corner 7 (the number of second discharge corner units 81 in a single second discharge corner 8) is preferably two or three.

[0115] Further, if Figure 6 As shown, the width of the first discharge corner unit 71 in the third direction is equal to the length of the corresponding second discharge corner unit 81 in the third direction, so that the amount of arc that can be gathered by the adjacent first discharge corner 7 and the second discharge corner 8 is roughly the same, reducing the loss during the arc transmission process, so that more arc can be transmitted backward, improving the utilization rate of the first arc extinguishing grid 43 at the rear of the arc extinguishing chamber, preventing excessive accumulation of arcs at the front of the arc extinguishing chamber, and improving the service life of the arc extinguishing chamber.

[0116] In other alternative embodiments, the width of the first discharge corner unit 71 in the third direction and the length of the corresponding second discharge corner unit 81 in the third direction may also be different, as long as stable arc transfer can be achieved.

[0117] Furthermore, in this embodiment, the two first discharge corner units 71 have the same width in the third direction, the two first discharge corner units 71 have the same length in the second direction, the two second discharge corner units 81 have the same length in the third direction, and the two second discharge corner units 81 have the same width in the second direction, so that the current of each current is roughly the same, making the arc transfer more uniform.

[0118] In other alternative embodiments, the sizes of the two first discharge corner units 71 may not be the same, and the sizes of the two second discharge corner units 81 may not be the same, as long as stable arc transfer can be achieved.

[0119] Further, if Figure 7 As shown, in the second direction, the distances between the tip of the second discharge corner 8 and the two adjacent first discharge corners 7 in the second direction are the same. This embodiment limits the equidistant layout of the second discharge corner 8 and the adjacent first discharge corners 7. While improving the arc transfer success rate, it can also achieve uniform electric field strength, prevent arc deflection or reignition, and improve arc extinguishing stability.

[0120] In other alternative embodiments, the distances between the tip of the second discharge sharp corner 8 and the first discharge sharp corners 7 adjacent to both sides in the second direction may also be unequal, as long as the arc transfer can be achieved.

[0121] like Figure 5 、 Figure 6 and Figure 8 As shown, the first arc-extinguishing grid 43 is provided with a first groove 101. The first groove 101 extends through the first arc-extinguishing grid 43 at both ends in the second direction and at one end in the first direction facing the first sidewall 61. The first discharge horn 7 is fixed to the bottom of the first groove 101. The first groove 101 can increase the size of the air inlet channel 23 in the first direction, thereby reducing the flow resistance of the gas in the air inlet channel 23, allowing more gas to enter the air inlet channel 23, and allowing more arcs to be blown into the air inlet channel 23 by the gas.

[0122] like Figure 5 and Figure 8 As shown, the two end surfaces of the first discharge corner 7 in the second direction are flush with the two end surfaces of the first arc-extinguishing grid 43 in the second direction, avoiding gas accumulation in the first groove 101 to form airflow turbulence, thereby ensuring smooth arc transmission, and preventing arc accumulation in the first groove 101, resulting in heat being difficult to dissipate and burning the first arc-extinguishing grid 43.

[0123] Further, if Figure 5 and Figure 8 As shown, the first discharge horn 7 has second grooves 102 on both sides in the third direction. The bottom of the first groove 101 is recessed along the first direction away from the first sidewall 61 to form the second groove 102. Both ends of the second groove 102 in the second direction extend through the first arc-quenching grid 43. The second grooves 102 increase the distance between the first arc-quenching grid 43 and the first sidewall 61 on both sides of the first discharge horn 7, making it easier for the arc to converge at the tip of the first discharge horn 7. The through-holes of the second groove 102 also prevent gas and arc accumulation.

[0124] In other alternative embodiments, the second groove 102 may not be provided, and the two sides of the first discharge corner 7 in the third direction may be planar structures.

[0125] This embodiment provides a circuit breaker with two arc extinguishing chambers. However, in other alternative implementations, the first arc extinguishing chamber 2 in this embodiment may also be used as the only arc extinguishing chamber in a circuit breaker with a single arc extinguishing chamber.

[0126] Example 2

[0127] The circuit breaker and the first arc extinguishing chamber 2 in this embodiment are substantially the same as those in embodiment 1, except that:

[0128] like Figure 9 As shown, two first arc-extinguishing grids 43 are provided between two adjacent second discharge corners 8 in the second direction. In this state, only one of the two first arc-extinguishing grids 43 between the two adjacent second discharge corners 8 needs to be provided with the first discharge corner 7.

[0129] In other alternative embodiments, the number of the first arc-extinguishing grids 43 between two adjacent second discharge corners 8 in the second direction may be other numbers as long as the continuous arc transmission is satisfied.

[0130] Example 3

[0131] The circuit breaker and the first arc extinguishing chamber 2 in this embodiment are substantially the same as those in embodiment 1, except that:

[0132] like Figure 10 As shown, the first discharge corner 7 extends along the third direction, and the two inclined surfaces of the first discharge corner 7 in the second direction intersect to form the tip of the first discharge corner 7. The second discharge corner 8 extends along the third direction, and the two inclined surfaces of the second discharge corner 8 in the second direction intersect to form the tip of the second discharge corner 8.

[0133] Example 4

[0134] The circuit breaker and the first arc extinguishing chamber 2 in this embodiment are substantially the same as those in embodiment 1, except that:

[0135] like Figure 11 As shown, the first discharge corner 7 extends along the second direction, and the two inclined surfaces of the first discharge corner 7 in the third direction intersect to form the tip of the first discharge corner 7. The second discharge corner 8 extends along the second direction, and the two inclined surfaces of the second discharge corner 8 in the third direction intersect to form the tip of the second discharge corner 8.

[0136] Example 5

[0137] The circuit breaker and the first arc extinguishing chamber 2 in this embodiment are substantially the same as those in embodiment 1, except that:

[0138] like Figure 12 As shown, the first discharge corner 7 extends along the second direction, and the two inclined surfaces of the first discharge corner 7 in the third direction intersect to form the tip of the first discharge corner 7. The second discharge corner 8 extends along the second direction, and the two inclined surfaces of the second discharge corner 8 in the third direction intersect to form the tip of the second discharge corner 8.

[0139] Example 6

[0140] The circuit breaker and the first arc extinguishing chamber 2 in this embodiment are substantially the same as those in the embodiment 1, except that the shape of the discharge corner is different.

[0141] It should be noted that the discharge sharp angle in this embodiment can be used as the first discharge sharp angle in embodiment 1, and can also be used as the second discharge sharp angle in embodiment 1.

[0142] The following description will be made by taking the discharge corner in this embodiment as the second discharge corner in Embodiment 1 as an example.

[0143] Specifically, if Figure 13 As shown, the second discharge horn 8 has a trapezoidal cross-section in a vertical plane. The second discharge horn 8 includes a first side surface 82, a second side surface 83, and a current collecting end surface 84. The first side surface 82 and the second side surface 83 are respectively the two end surfaces of the second discharge horn 8 in the second direction. The current collecting end surface 84 is the end surface of the second discharge horn 8 facing the first arc-quenching grid assembly in the first direction, corresponding to the tip of the second discharge horn 8 in Example 1. The first side surface 82 and the second side surface 83 are inclined toward each other in the first direction toward one end of the first arc-quenching grid assembly, so that the distance between the first side surface 82 and the second side surface 83 in the second direction facing the first sidewall is greater than the distance between the first side surface 82 and the second side surface 83 in the second direction facing the first arc-quenching grid assembly.

[0144] Although the current collecting end surface 84 in this embodiment is not a sharp point, the current collecting effect can be achieved by controlling the length of the current collecting end surface 84 in the second direction within a relatively small range. The specific range of the length of the current collecting end surface 84 in the second direction that is required to collect current is a matter of prior art in the art, and those skilled in the art can design the range based on actual needs.

[0145] In the description of the present invention, it should be understood that the terms "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings for the convenience of describing the present invention and simplifying the description. They do not indicate or imply that the device or component referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.

[0146] Although specific embodiments of the present invention have been described above, those skilled in the art will appreciate that these are merely illustrative and that the scope of the present invention is defined by the appended claims. Those skilled in the art may make various changes or modifications to these embodiments without departing from the principles and essence of the present invention, and such changes and modifications are intended to fall within the scope of the present invention.

Claims

1. An arc extinguishing chamber, comprising a housing, an arc guide plate, and a first arc extinguishing grid assembly disposed within the housing, wherein a first arc inlet channel is provided on a first side wall of the housing, the arc guide plate covers an inner wall surface of a housing wall of the first side wall and is detachably connected to the housing, the first arc extinguishing grid assembly comprises a first arc extinguishing grid group disposed opposite to the housing wall, the first arc extinguishing grid group comprises a plurality of first arc extinguishing grids spaced apart, the first arc extinguishing grid group and the arc guide plate form an air inlet channel in a first direction, the first direction being a direction of thickness of the first side wall, and characterized in that: At least some of the first arc-extinguishing grids in the first arc-extinguishing grid group are provided with a first discharge sharp corner, and an end surface of the arc guide plate facing the first arc-extinguishing grid group is provided with a second discharge sharp corner. The first discharge sharp corner and the second discharge sharp corner form a continuous discharge path, and the current direction of the discharge path is consistent with the flow direction of the gas in the air inlet channel.

2. The arc extinguishing chamber according to claim 1, characterized in that The first discharge corner is provided at one end of the first arc-extinguishing grid facing the first side wall, and the tip of the first discharge corner and the tip of the second discharge corner are arranged opposite to each other in a first direction; There are multiple first discharge sharp corners and multiple second discharge sharp corners, which are alternately arranged in sequence in the second direction, where the second direction is the direction in which the multiple first arc-extinguishing grids are spaced apart.

3. The arc extinguishing chamber according to claim 2, characterized in that The second discharge corner is provided between two adjacent first arc-extinguishing grids in the second direction, and both two adjacent first arc-extinguishing grids in the second direction are provided with the first discharge corner.

4. The arc extinguishing chamber according to claim 3, characterized in that In the second direction, the distances between the tip of the second discharge sharp corner and two adjacent first discharge sharp corners in the second direction are the same.

5. The arc extinguishing chamber according to claim 2, characterized in that: The first discharge sharp angle and the second discharge sharp angle at least partially overlap in the third direction; The third direction is perpendicular to a plane formed by the first direction and the second direction.

6. The arc extinguishing chamber according to claim 5, characterized in that The first discharge corner extends along the second direction, and two inclined surfaces of the first discharge corner in the third direction intersect to form a tip of the first discharge corner; And / or, the first discharge corner extends along the third direction, and two inclined surfaces of the first discharge corner in the second direction intersect to form a tip of the first discharge corner.

7. The arc extinguishing chamber according to claim 5, characterized in that The second discharge corner extends along a third direction, and two inclined surfaces of the second discharge corner in the second direction intersect to form a tip of the second discharge corner; And / or, the second discharge corner extends along the second direction, and two inclined surfaces of the second discharge corner in the third direction intersect to form a tip of the second discharge corner.

8. The arc extinguishing chamber according to claim 2, characterized in that: The first discharge corner extends along the second direction, and two inclined surfaces of the first discharge corner in the third direction intersect to form a tip of the first discharge corner; The first discharge horn includes a plurality of first discharge horn units sequentially arranged along the third direction, and the second discharge horn includes a plurality of second discharge horn units sequentially arranged along the third direction. The number of the first discharge horn units in a single first discharge horn is the same as the number of the second discharge horn units in a single second discharge horn, and the units are arranged in a one-to-one correspondence. The third direction is perpendicular to a plane formed by the first direction and the second direction.

9. The arc extinguishing chamber according to claim 8, characterized in that The second discharge corner extends along the third direction, and two inclined surfaces of the second discharge corner in the second direction intersect to form a tip of the second discharge corner; The width of the first discharge corner unit in the third direction is equal to the length of the corresponding second discharge corner unit in the third direction.

10. The arc extinguishing chamber according to claim 2, characterized in that The first arc-extinguishing grid is provided with a first groove. The first groove passes through the first arc-extinguishing grid at both ends in the second direction and at one end in the first direction facing the first side wall. The first discharge corner is fixed to the bottom of the first groove.

11. The arc extinguishing chamber according to claim 10, characterized in that The first discharge corner extends along the second direction, and two inclined surfaces of the first discharge corner in a third direction intersect to form a tip of the first discharge corner, and the third direction is perpendicular to a plane formed by the first direction and the second direction; Both end surfaces of the first discharge corner in the second direction are flush with both end surfaces of the first arc-extinguishing grid in the second direction.

12. The arc extinguishing chamber according to claim 11, characterized in that The first discharge corner is provided with second grooves on both sides in the third direction. The bottom of the first groove is recessed along the first direction away from the first side wall to form the second groove. Both ends of the second groove in the second direction pass through the first arc-extinguishing grid.

13. The arc extinguishing chamber according to any one of claims 2 to 12, characterized in that: The first arc-extinguishing grid assembly further includes a second arc-extinguishing grid group arranged opposite to the first arc entry channel, the second arc-extinguishing grid group includes a plurality of first arc-extinguishing grids arranged at intervals, and at least some of the first arc-extinguishing grids in the second arc-extinguishing grid group close to the first arc-extinguishing grid group are provided with the first discharge sharp corners.

14. A circuit breaker, characterized in that: Comprising the arc extinguishing chamber according to any one of claims 1-13.

15. The circuit breaker according to claim 14, wherein: The circuit breaker includes a first arc extinguishing chamber and a second arc extinguishing chamber, the first arc extinguishing chamber is connected to the second arc extinguishing chamber, the direction of the first arc entering channel of the first arc extinguishing chamber and the direction of the second arc entering channel of the second arc extinguishing chamber form an angle, the first arc extinguishing chamber is the arc extinguishing chamber described in any one of claims 1-13, and the static contact of the circuit breaker is arranged on the first arc extinguishing chamber.

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