Arc-extinguishing chamber and circuit breaker
By designing a discharge sharp angle and an air intake channel with a continuous discharge path in the arc-extinguishing chamber, the problem of arc accumulation at the front is solved, thereby improving the service life of the arc-extinguishing chamber and the breaking capacity of the circuit breaker.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- ZHEJIANG CHINT ELECTRIC CO LTD
- Filing Date
- 2025-08-01
- Publication Date
- 2026-07-17
AI Technical Summary
In existing arc-extinguishing chambers, electric arc tends to accumulate at the front, leading to excessive heat in the arc-extinguishing grid and reducing the service life of the arc-extinguishing chamber.
An arc-extinguishing chamber is designed, which uses first and second discharge apexes to form a continuous discharge path inside the shell. The arc is concentrated by the principle of tip discharge and transmitted away from the arc entry channel, increasing the utilization rate of the rear arc-extinguishing grid and accelerating the arc propagation through the air intake channel.
It improves the utilization rate of the arc-extinguishing grid plates at the rear of the arc-extinguishing chamber, prevents excessive arc accumulation at the front, extends the service life of the arc-extinguishing chamber, and enhances the arc-extinguishing capacity and the breaking performance of the circuit breaker.
Smart Images
Figure CN224519855U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of low-voltage electrical appliances, and in particular to an arc-extinguishing chamber and a circuit breaker. Background Technology
[0002] Circuit breakers are key devices for switching circuits on and off, providing electrical protection. When faced with abnormally high currents, circuit breakers can quickly disconnect the circuit and interrupt the current. During the disconnection process, the air medium between the moving and stationary contacts discharges under the influence of voltage, creating an electric arc and generating highly heated gas. If the arc continues to burn, it will generate enormous energy, potentially causing the circuit breaker to burn out. Circuit breakers typically include arc-extinguishing chambers to extinguish the arc. The gas generated during disconnection blows the arc into the arc-extinguishing chamber, causing the arc-extinguishing grids within the chamber to cut the arc, thereby extinguishing it.
[0003] However, in actual tests, the arc often accumulates at the front of the arc-extinguishing chamber, preventing it from moving backward and into more arc-extinguishing grids. This results in low utilization of the arc-extinguishing grids at the rear of the arc-extinguishing chamber, while the arc-extinguishing grids at the front accumulate too much heat, which can easily cause the arc-extinguishing chamber to burn out and reduce its service life. Utility Model Content
[0004] The technical problem to be solved by this utility model is to overcome the defect in the prior art that the electric arc easily accumulates at the front of the arc-extinguishing chamber, resulting in excessive heat accumulation on the arc-extinguishing grid plates at 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-mentioned technical problems through the following technical solution:
[0006] An arc-extinguishing chamber includes a shell, an arc guide plate, and a first arc-extinguishing grid assembly disposed inside the shell. A first arc entry channel is provided on a first sidewall of the shell. The arc guide plate covers the inner wall surface of the shell wall of the first sidewall and is detachably connected to the shell. The first arc-extinguishing grid assembly includes a first arc-extinguishing grid group disposed opposite to the shell wall. The first arc-extinguishing grid group includes a plurality of spaced-apart first arc-extinguishing grids. The first arc-extinguishing grid group and the arc guide plate form an air intake channel in a first direction, which is the wall thickness direction of the first sidewall. At least a portion of the first arc-extinguishing grids in the first arc-extinguishing grid group are provided with a first discharge tip. A second discharge tip is provided on one end face of the arc guide plate facing the first arc-extinguishing grid group. The first discharge tip and the second discharge tip form a continuous discharge path. The current direction of the discharge path is consistent with the gas flow direction in the air intake channel.
[0007] In this design, based on the principle of tip discharge, the tips of the first and second discharge horns are more likely to accumulate the arc. This allows the arc to transmit current away from the arc entry channel via the first and second discharge horns, directing more arc flow towards the first arc-extinguishing grid on the side furthest from the arc entry channel. This improves the utilization rate of the first arc-extinguishing grid at the rear of the arc-extinguishing chamber, prevents excessive arc accumulation on the side closest to the arc entry channel, reduces the likelihood of burn-out at the front of the arc-extinguishing chamber, and extends the service life of the arc-extinguishing chamber. The gas in the intake channel not only accelerates the arc propagation speed but also blows the arc into the area between the two first arc-extinguishing grids, causing the grids to break the arc.
[0008] Preferably, the first discharge tip is located at the end of the first arc-extinguishing grid plate facing the first sidewall, and the tips of the first discharge tip and the tips of the second discharge tip are arranged opposite to each other in a first direction;
[0009] The number of the first discharge tip and the number of the second discharge tip are both multiple. The multiple first discharge tips and the multiple second discharge tips are arranged alternately in a second direction, which is the direction in which the multiple first arc-extinguishing grid plates are spaced apart.
[0010] In this scheme, the above-mentioned arrangement facilitates the continuous transmission of the electric arc. The staggered arrangement of the first discharge tip and the second discharge tip can avoid the situation where the electric arc cannot be transmitted backward due to the accumulation between the relatively arranged first discharge tip and the second discharge tip.
[0011] Preferably, the second discharge tip is disposed between two adjacent first arc-extinguishing grid plates in the second direction, and both first arc-extinguishing grid plates adjacent to the second discharge tip in the second direction are provided with the first discharge tip.
[0012] In this scheme, the above-mentioned arrangement can shorten the distance between adjacent first discharge tips and second discharge tips in the second direction, thereby improving the success rate of arc transmission.
[0013] Preferably, in the second direction, the tip of the second discharge tip is at the same distance from the two adjacent first discharge tips in the second direction.
[0014] In this scheme, by limiting the second discharge tip to be equidistant from the adjacent first discharge tip, the success rate of arc transmission can be improved, the electric field intensity can be made uniform, the arc can be prevented from deflecting or reigniting, and the arc extinguishing stability can be enhanced.
[0015] Preferably, the first discharge tip and the second discharge tip at least partially overlap in the third direction;
[0016] The third direction is perpendicular to the plane formed by the first direction and the second direction.
[0017] In this scheme, the above-mentioned settings can shorten the distance between adjacent first and second discharge tips, thereby improving the success rate of arc transmission.
[0018] Preferably, the first discharge tip extends along the second direction, and the two inclined planes of the first discharge tip intersect in the third direction to form the tip of the first discharge tip;
[0019] And / or, the first discharge tip extends along a third direction, and the two inclined planes of the first discharge tip intersect in a second direction to form the tip of the first discharge tip.
[0020] In this solution, two shapes of the first discharge tip are provided. By increasing the length of the first discharge tip, more arcs can be gathered, thereby enabling more arcs to be transmitted backward, improving the utilization rate of the first arc-extinguishing grid plate at the rear of the arc-extinguishing chamber, preventing excessive arc accumulation at the front of the arc-extinguishing chamber, and improving the service life of the arc-extinguishing chamber.
[0021] Preferably, the second discharge tip extends along a third direction, and the two inclined surfaces of the second discharge tip intersect in a second direction to form the tip of the second discharge tip;
[0022] And / or, the second discharge tip extends along a second direction, and the two inclined planes of the second discharge tip intersect in a third direction to form the tip of the second discharge tip.
[0023] In this solution, two shapes of the second discharge tip are provided. By increasing the length of the second discharge tip, more arcs are gathered, thereby enabling more arcs to be transmitted backward, improving the utilization rate of the first arc-extinguishing grid plate at the rear of the arc-extinguishing chamber, preventing excessive arc accumulation at the front of the arc-extinguishing chamber, and improving the service life of the arc-extinguishing chamber.
[0024] Preferably, the first discharge tip extends along the second direction, and the two inclined planes of the first discharge tip in the third direction intersect to form the tip of the first discharge tip;
[0025] The first discharge tip includes a plurality of first discharge tip units arranged sequentially along a third direction, and the second discharge tip includes a plurality of second discharge tip units arranged sequentially along a third direction. The number of first discharge tip units in a single first discharge tip is the same as the number of second discharge tip units in a single second discharge tip and they are arranged in a one-to-one correspondence.
[0026] The third direction is perpendicular to the plane formed by the first direction and the second direction.
[0027] In this scheme, a current can be formed between each first discharge tip unit and the second discharge tip unit. The above arrangement improves the current transmission efficiency by dividing the electric arc into multiple currents, and also prevents the local electric arcs at the first and second discharge tips from becoming too concentrated and easily burning out.
[0028] Preferably, the second discharge tip extends along a third direction, and the two inclined surfaces of the second discharge tip in the second direction intersect to form the tip of the second discharge tip;
[0029] The width of the first discharge tip unit in the third direction is equal to the length of the corresponding second discharge tip unit in the third direction.
[0030] In this scheme, the above-mentioned arrangement ensures that the amount of arc that can be gathered by adjacent first and second discharge tips is approximately the same, reducing the loss during the arc transmission process, thereby enabling more arc to be transmitted backward, improving the utilization rate of the first arc-extinguishing grid plate at the rear of the arc-extinguishing chamber, preventing excessive arc accumulation at the front of the arc-extinguishing chamber, and improving the service life of the arc-extinguishing chamber.
[0031] Preferably, the first arc-extinguishing grid is provided with a first groove, the two ends of the first groove in the second direction and the end facing the first sidewall in the first direction penetrate the first arc-extinguishing grid, and the first discharge tip is fixed to the bottom of the first groove.
[0032] In this scheme, the above-mentioned arrangement can increase the size of the intake channel in the first direction, thereby reducing the flow resistance of gas in the intake channel, allowing more gas to enter the intake channel, and allowing more electric arcs to be blown into the intake channel by the gas.
[0033] Preferably, the first discharge tip extends along the second direction, and the first discharge tip intersects two inclined planes in the third direction to form the tip of the first discharge tip, and the third direction is perpendicular to the plane composed of the first direction and the second direction;
[0034] The two end faces of the first discharge tip in the second direction are flush with the two end faces of the first arc-extinguishing grid in the second direction.
[0035] In this scheme, the above-mentioned arrangement avoids gas accumulation in the first groove to form airflow turbulence, thus ensuring the smooth transmission of the electric arc. On the other hand, it also prevents the electric arc from accumulating in the first groove, which would make it difficult for heat to dissipate and burn out the first arc-extinguishing grid.
[0036] Preferably, the first discharge tip has second grooves on both sides in the third direction, the bottom of the first groove is recessed in the first direction away from the first sidewall to form the second groove, and the two ends of the second groove in the second direction penetrate the first arc extinguishing grid.
[0037] In this design, the aforementioned arrangement increases the distance between the first arc-extinguishing grid plates and the first sidewall on both sides of the first discharge tip, making it easier for the arc to accumulate at the tip of the first discharge tip. The through-hole design at both ends of the second groove also prevents the accumulation of gas and arc.
[0038] Preferably, the first arc-extinguishing grid assembly further includes a second arc-extinguishing grid group disposed opposite to the first arc entry channel. The second arc-extinguishing grid group includes a plurality of first arc-extinguishing grids disposed at intervals, and at least a portion of the first arc-extinguishing grids in the second arc-extinguishing grid group that is close to the first arc-extinguishing grid group is provided with the first discharge tip.
[0039] In this scheme, the above-mentioned arrangement can increase the amount of electric arc entering the air intake channel, thereby enabling more electric arc to be transmitted backward, improving the utilization rate of the first arc-extinguishing grid plate at the rear of the arc-extinguishing chamber, preventing excessive accumulation of electric arc at the front of the arc-extinguishing chamber, and improving the service life of the arc-extinguishing chamber.
[0040] A circuit breaker comprising an arc-extinguishing chamber as described above.
[0041] In this scheme, the circuit breaker is used to control the switching of the circuit and plays a role in electrical protection. 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 and the second arc-extinguishing chamber are connected, the orientation of the first arc-entry channel of the first arc-extinguishing chamber and the orientation of the second arc-entry channel of the second arc-extinguishing chamber form an angle, the first arc-extinguishing chamber is the arc-extinguishing chamber described above, and the stationary contact of the circuit breaker is disposed on the first arc-extinguishing chamber.
[0043] In this scheme, the design of dual arc-extinguishing chambers can achieve energy diversion and improve arc-extinguishing capability.
[0044] The positive and progressive effects of this invention are as follows: Based on the principle of tip discharge, the tips of the first and second discharge horns are more likely to accumulate the arc. Therefore, the arc can transmit current through the first and second discharge horns in a direction away from the first arc entry channel, causing more arc to flow towards the first arc-extinguishing grid on the side away from the first arc entry channel. This improves the utilization rate of the first arc-extinguishing grid at the rear of the arc-extinguishing chamber, prevents excessive arc accumulation on the first arc-extinguishing grid near the first arc entry channel, reduces the possibility of burn-out at the front of the arc-extinguishing chamber, and increases the service life of the arc-extinguishing chamber. The gas in the air intake channel not only accelerates the arc propagation speed but also blows the arc into the area between the two first arc-extinguishing grids, allowing the first arc-extinguishing grids to break the arc. Attached Figure Description
[0045] Figure 1 This is a schematic diagram of the internal structure of the circuit breaker when the stationary and moving contacts are closed in Embodiment 1 of this utility model.
[0046] Figure 2 This is a schematic diagram of the internal structure of the circuit breaker after the stationary and moving contacts are disconnected, according to Embodiment 1 of this utility model.
[0047] Figure 3 This is a three-dimensional structural diagram of the first arc-extinguishing chamber in Embodiment 1 of this utility model.
[0048] Figure 4 This is a schematic diagram of the internal structure of the first arc-extinguishing chamber in Embodiment 1 of this utility model.
[0049] Figure 5 This is a schematic diagram of another internal structure of the first arc-extinguishing chamber in Embodiment 1 of this utility model.
[0050] Figure 6 This is a schematic diagram showing the positional relationship between the first discharge tip and the second discharge tip in Embodiment 1 of this utility model.
[0051] Figure 7 This is a schematic diagram showing the positional relationship between the first arc-extinguishing grid and the second discharge tip in Embodiment 1 of this utility model.
[0052] Figure 8 This is a side view of the first arc-extinguishing grid sheet in Embodiment 1 of this utility model.
[0053] Figure 9 This is a schematic diagram showing the positional relationship between the first arc-extinguishing grid and the second discharge tip in Embodiment 2 of this utility model.
[0054] Figure 10 This is a schematic diagram showing the extension direction of the first and second discharge tips in Embodiment 3 of this utility model.
[0055] Figure 11This is a schematic diagram showing the extension direction of the first discharge tip and the second discharge tip in Embodiment 4 of this utility model.
[0056] Figure 12 This is a schematic diagram showing the extension direction of the first discharge tip and the second discharge tip in Embodiment 5 of this utility model.
[0057] Figure 13 This is a cross-sectional schematic diagram of the second discharge tip of Embodiment 6 of this utility model.
[0058] Explanation of reference numerals in the attached figures:
[0059] Static contact 11
[0060] Moving contact 12
[0061] First Arc Extinguishing Chamber 2
[0062] First arc-extinguishing cavity 21
[0063] First air outlet 22
[0064] Intake passage 23
[0065] Second arc-extinguishing chamber 3
[0066] Second arc-extinguishing cavity 31
[0067] Second arc-quenching grid assembly 32
[0068] Second arc-extinguishing grid 321
[0069] Second air outlet 33
[0070] First arc-quenching grid assembly 4
[0071] First arc-quenching grid group 41
[0072] Second arc-extinguishing grid group 42
[0073] First arc-extinguishing grid plate 43
[0074] First arc enters channel 51
[0075] Second arc enters channel 52
[0076] Casing 6
[0077] First sidewall 61
[0078] Second sidewall 62
[0079] First discharge apex 7
[0080] First discharge apex unit 71
[0081] Second discharge angle 8
[0082] Second discharge apex unit 81
[0083] First side view 82
[0084] Second side 83
[0085] collector end face 84
[0086] Arc guide plate 9
[0087] First groove 101
[0088] Second groove 102 Detailed Implementation
[0089] The present invention will be further described below by way of embodiments, but the present invention is not limited to the scope of the embodiments.
[0090] Example 1
[0091] like Figure 1 and Figure 2 As shown, this embodiment discloses a circuit breaker for realizing circuit switching and providing electrical protection in the circuit. Specifically, the circuit breaker includes an arc-extinguishing chamber and a contact mechanism, which includes a stationary contact 11 and a moving contact 12. When the circuit is operating normally, the stationary contact 11 and the moving contact 12 are closed to achieve normal current transmission. When a short circuit or overload occurs in the circuit, the stationary contact 11 and the moving contact 12 separate, and the air medium between the stationary contact 11 and the moving contact 12 discharges under the action of voltage, thereby generating an electric arc between the stationary contact 11 and the moving contact 12. When the stationary contact 11 and the moving contact 12 separate, a large amount of gas is also generated. The electric arc flows into the arc-extinguishing chamber under the guidance of the gas to break the arc, thereby achieving 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 provided inside the first arc-extinguishing cavity 21 to interrupt the electric arc. The second arc-extinguishing chamber 3 has a second arc-extinguishing cavity 31, and a second arc-extinguishing grid assembly 32 is provided inside the second arc-extinguishing cavity 31 to interrupt the electric arc. The stationary contact 11 is located at one end of the first arc-extinguishing chamber 2 where the first arc-entry channel 51 is located, so that the orientation of the second arc-entry channel 52 of the second arc-extinguishing chamber 3 is directly opposite to the contact mechanism. The orientation of the first arc-entry channel 51 of the first arc-extinguishing chamber 2 is perpendicular to the orientation of the second arc-entry channel 52 of the second arc-extinguishing chamber 3. The first arc-extinguishing cavity 21 of the first arc-extinguishing chamber 2 and the second arc-extinguishing cavity 31 of the second arc-extinguishing chamber 3 are connected. The arc and gas generated by the stationary contact 11 and the moving contact 12 are divided into two streams and flow into the first arc-extinguishing cavity 21 and the second arc-extinguishing cavity 31 respectively. The design of the double arc-extinguishing chamber can realize energy diversion and improve the arc-extinguishing capability.
[0093] Specifically, such as Figure 1 and Figure 2 As shown, the lower end of the second arc-extinguishing chamber 3 is open to form a second arc entry channel 52, that is, the orientation of the second arc entry 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 spaced apart in the horizontal direction. Part of the arc and gas enter the second arc-extinguishing cavity 31 through the second arc entry 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 gas outlet 33 at the upper end of the second arc-extinguishing chamber 3 into the second arc-extinguishing cavity 31.
[0094] like Figure 1 and Figure 2 As shown, the first arc entry channel 51 of the first arc-extinguishing chamber 2 is located 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 orientation of the first arc entry channel 51 of the first arc-extinguishing chamber 2 is parallel to the horizontal direction. 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 entry 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 gas outlet 22 at the lower end of the first arc-extinguishing chamber 2 into the first arc-extinguishing cavity 21.
[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 Figures 1-4 As shown, the first arc-extinguishing chamber 2 includes a housing 6, an arc-guiding plate 9, and a first arc-extinguishing grid plate assembly 4. The first arc-extinguishing chamber 2 is formed inside the housing 6, and the first arc-extinguishing grid plate assembly 4 is disposed inside the first arc-extinguishing chamber 2 to interrupt the electric arc flowing into the first arc-extinguishing cavity 21.
[0097] Specifically, such as Figure 4 As shown, the housing 6 includes a first sidewall 61 and a second sidewall 62 arranged opposite each other in the horizontal direction. A first arc inlet channel 51 for the first arc-extinguishing chamber 2 is provided on the first sidewall 61 of the housing 6. The first sidewall 61 is a sidewall facing the second arc-extinguishing chamber 3 in the horizontal direction, and the first arc inlet channel 51 is located at the upper end of the first sidewall 61. The first arc-extinguishing grid assembly 4 inside the first arc-extinguishing chamber 2 includes multiple components along a second direction (i.e., the vertical direction). Figure 4The first arc-extinguishing grid plates 43 are spaced apart in the Y direction (in the middle), and multiple first arc-extinguishing grid plates 43 are fixed on the second side wall 62. Among them, a number of first arc-extinguishing grid plates 43 arranged opposite to the shell wall of the first side wall 61 form a first arc-extinguishing grid plate group 41, and a number of first arc-extinguishing grid plates 43 arranged opposite to the first arc entry channel 51 of the first arc-extinguishing chamber 2 form a second arc-extinguishing grid plate group 42. That is, the first arc-extinguishing grid plate group 41 and the second arc-extinguishing grid plate group 42 are adjacent in the vertical direction, and the first arc-extinguishing grid plate group 41 is located at the lower end of the second arc-extinguishing grid plate group 42.
[0098] It should be noted that the number of first arc-extinguishing grid plates 43 included in the first arc-extinguishing grid plate group 41 and the second arc-extinguishing grid plate group 42 is not specifically limited, and is designed according to the actual situation.
[0099] like Figure 5 and Figure 7 As shown, the portion of the arc guide plate 9 extending into the first arc-extinguishing chamber 2 covers the inner wall surface of the shell wall of the first side wall 61 and is detachably connected to the shell 6. The arc guide plate 9 extends to the outside of the shell 6 through the first arc entry channel 51, and the stationary contact 11 is located on the portion of the arc guide plate 9 located outside the shell 6. The arc guide plate 9 is made of metal and can isolate the direct ablation of the shell 6 by the arc, extending the service life of the shell 6. The detachable connection between the arc guide plate 9 and the shell 6 allows for individual repair and replacement of the arc guide plate 9, reducing repair and replacement costs.
[0100] like Figure 4 As shown, the arc guide plate 9 and the first arc extinguishing grid plate group 41 are in the first direction (i.e., the wall thickness direction of the first sidewall 61). Figure 4 An air intake channel 23 is formed in the X direction of the housing 6. The air intake channel 23 is used for the electric arc and gas flow. In the air intake channel 23, the gas blows the electric arc toward the interval between the multiple first arc-extinguishing grid plates 43 to realize the arc-breaking function of the first arc-extinguishing grid plates 43. After passing through the first arc-extinguishing grid plate group 41, the gas will be discharged from the first air outlet 22 at the lower end of the housing 6 into the first arc-extinguishing chamber 21.
[0101] like Figure 5 and Figure 6 As shown, at least a portion of the first arc-extinguishing grid plates 43 in the first arc-extinguishing grid plate group 41 are provided with a first discharge tip 7, and the arc guide plate 9 is provided with a second discharge tip 8 on one end face of the first arc-extinguishing grid plate group 41 in the first direction. The first discharge tip 7 and the second discharge tip 8 form a continuous discharge path, and the current direction of the discharge path is consistent with the gas flow direction in the air intake channel 23.
[0102] According to the principle of tip discharge, the tips of the first discharge tip 7 and the second discharge tip 8 are more likely to accumulate the arc. Thus, the arc can transmit current through the first discharge tip 7 and the second discharge tip 8 in a direction away from the first arc entry channel 51, causing more arc to flow towards the first arc-extinguishing grid plate 43 on the side away from the first arc entry channel 51. This improves the utilization rate of the first arc-extinguishing grid plate 43 at the rear of the arc-extinguishing chamber, prevents excessive arc accumulation on the first arc-extinguishing grid plate 43 near the first arc entry channel 51, reduces the possibility of burn-out 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 intake channel 23 not only accelerates the arc propagation speed but also blows the arc into the area between the two first arc-extinguishing grid plates 43, allowing the first arc-extinguishing grid plates 43 to interrupt the arc.
[0103] like Figure 5 and Figure 6 As shown, the first discharge tip 7 is located at the end of the first arc-extinguishing grid plate 43 facing the first sidewall 61 in the first direction. The tips of the first discharge tip 7 and the second discharge tip 8 are positioned opposite each other in the first direction to achieve continuous arc transmission. The second discharge tip 8 is located between two adjacent first arc-extinguishing grid plates 43 in the second direction, and both first arc-extinguishing grid plates 43 adjacent to the second discharge tip 8 in the second direction are provided with the first discharge tip 7, thereby shortening the distance between adjacent first discharge tips 7 and second discharge tips 8 in the second direction and improving the success rate of arc transmission.
[0104] Specifically, in this embodiment, all the first arc-extinguishing grid plates 43 in the first arc-extinguishing grid plate group 41 are provided with a first discharge tip 7, and a second discharge tip 8 is provided between two adjacent first arc-extinguishing grid plates 43 in the first arc-extinguishing grid plate group 41. The multiple first discharge tips 7 and the multiple second discharge tips 8 are arranged alternately in the second direction to avoid the situation where the arc cannot be transmitted backward due to the accumulation between the relatively arranged first discharge tips 7 and second discharge tips 8.
[0105] In other alternative embodiments, it is not necessary for all the first arc-extinguishing grid plates 43 in the first arc-extinguishing grid plate group 41 to be provided with a first discharge tip 7, or for a second discharge tip 8 to be provided between two adjacent first arc-extinguishing grid plates 43. The positional arrangement of the first discharge tip 7 and the second discharge tip 8 is sufficient to ensure that the arc gathered at the first discharge tip 7 can be transmitted to the adjacent second discharge tip 8.
[0106] Furthermore, in this embodiment, all the first arc-extinguishing grid plates 43 in the second arc-extinguishing grid plate group 42 are also provided with a first discharge tip 7, so that the arc that just enters the first arc-extinguishing cavity 21 can be transmitted under the principle of tip discharge, increasing the amount of arc entering the air intake channel 23, thereby enabling more arc to be transmitted to the rear, improving the utilization rate of the first arc-extinguishing grid plates 43 at the rear of the arc-extinguishing chamber, preventing excessive arc accumulation at the front of the arc-extinguishing chamber, and improving the service life of the arc-extinguishing chamber.
[0107] In other alternative embodiments, only a portion of the first arc-extinguishing grid plates 43 in the second arc-extinguishing grid plate group 42 closest to the first arc-extinguishing grid plate group 41 may have a first discharge tip 7. This also achieves the effect of arc transmission when the arc just entering the first arc-extinguishing cavity 21 is triggered by the tip discharge principle. In this embodiment, all the first arc-extinguishing grid plates 43 in the second arc-extinguishing grid plate group 42 are designed to have a first discharge tip 7, which eliminates the need to distinguish whether the first arc-extinguishing grid plates 43 belong to the first arc-extinguishing grid plate group 41 or the second arc-extinguishing grid plate group 42 during installation, simplifying the assembly process.
[0108] like Figure 5 and Figure 6 As shown, in this embodiment, the first discharge tip 7 extends along the second direction to increase the length of the first discharge tip 7 in the second direction. The first discharge tip 7 in the third direction ( Figure 5 Two inclined planes in the Z direction intersect to form the tip of the first discharge tip 7. The second discharge tip 8 extends along the third direction to increase its length in that direction. Two inclined planes in the second direction intersect to form the tip of the second discharge tip 8. In this embodiment, both the tip of the first discharge tip 7 and the tip of the second discharge tip 8 are sharp points formed by the intersection of two inclined planes, resulting in better current concentration. The third direction is perpendicular to the plane formed by the first and second directions, meaning it is parallel to the horizontal plane.
[0109] In this embodiment, by increasing the length of the first discharge tip 7 and the second discharge tip 8, more arcs are gathered, thereby enabling more arcs to be transmitted backward, improving the utilization rate of the first arc-extinguishing grid plate 43 at the rear of the arc-extinguishing chamber, preventing excessive arc accumulation 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 tip 7 is designed to extend along the second direction, which shortens the distance between the first discharge tip 7 and the second discharge tip 8, improving the success rate of arc transmission. In this embodiment, the second discharge tip 8 is designed to extend along the third direction to prevent excessive arc retention on the second discharge tip 8, allowing the gas to blow the arc into the gap between adjacent first arc-extinguishing grid plates 43. In other alternative embodiments, the first discharge tip 7 may extend along the third direction, with its two inclined surfaces in the second direction intersecting to form the tip of the first discharge tip 7; or the second discharge tip 8 may extend along the second direction, with its two inclined surfaces in the third direction intersecting to form the tip of the second discharge tip 8.
[0111] Furthermore, such as Figure 6 As shown, the first discharge tip 7 and the second discharge tip 8 at least partially overlap in the third direction to shorten the distance between adjacent first discharge tips 7 and second discharge tips 8 and improve the success rate of arc transmission.
[0112] Specifically, such as Figure 6 As shown, in this embodiment, the first discharge tip 7 includes two first discharge tip units 71 arranged sequentially along a third direction, and the second discharge tip 8 includes two second discharge tip units 81 arranged sequentially along a third direction. The number of the two first discharge tip units 71 corresponds one-to-one with the number of the two second discharge tip units 81, and a current can be formed between each first discharge tip unit 71 and each second discharge tip unit 81. This embodiment improves the current transmission efficiency by dividing the arc into multiple current streams, and also prevents the local arc from becoming too concentrated and easily burning out in the first discharge tip 7 and the second discharge tip 8.
[0113] In this embodiment, both first discharge tip units 71 extend along the second direction, and both second discharge tip units 81 extend along the third direction. In other alternative embodiments, the extension directions of the plurality of first discharge tip units 71 in a single first discharge tip 7 may be the same or different, and the extension directions of the plurality of second discharge tip units 81 in a single second discharge tip 8 may be the same or different.
[0114] In other alternative embodiments, the number of first discharge tip units 71 in a single first discharge tip 7 and the number of second discharge tip units 81 in a single second discharge tip 8 can be one or more, provided that the number of first discharge tip units 71 in a single first discharge tip 7 and the number of second discharge tip units 81 in a single second discharge tip 8 are the same and correspond one-to-one. To improve the arc transmission, the number of first discharge tip units 71 in a single first discharge tip 7 (and the number of second discharge tip units 81 in a single second discharge tip 8) is preferably two or three.
[0115] Furthermore, such as Figure 6 As shown, the width of the first discharge tip unit 71 in the third direction is equal to the length of the corresponding second discharge tip unit 81 in the third direction, so that the amount of arc that can be gathered by adjacent first discharge tips 7 and second discharge tips 8 is approximately the same, reducing the loss in the arc transmission process, thereby enabling more arc to be transmitted backward, improving the utilization rate of the first arc extinguishing grid plate 43 at the rear of the arc extinguishing chamber, preventing excessive arc accumulation 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 tip unit 71 in the third direction and the length of the corresponding second discharge tip unit 81 in the third direction may also be different, as long as the arc can be stably transmitted.
[0117] Furthermore, in this embodiment, the two first discharge tip units 71 have the same width in the third direction, the two first discharge tip units 71 have the same length in the second direction, the two second discharge tip units 81 have the same length in the third direction, and the two second discharge tip units 81 have the same width in the second direction, so that the current per unit is approximately the same, making the arc transmission more uniform.
[0118] In other alternative implementations, the dimensions of the two first discharge tip units 71 may not correspond to the same size, and the dimensions of the two second discharge tip units 81 may also not correspond to the same size, as long as the arc can be stably transmitted.
[0119] Furthermore, such as Figure 7 As shown, in the second direction, the distance from the tip of the second discharge tip 8 to the two adjacent first discharge tips 7 in the second direction is the same. In this embodiment, by limiting the second discharge tip 8 and the adjacent first discharge tip 7 to be equidistant, the success rate of arc transmission can be improved, the electric field intensity can be made uniform, the arc can be prevented from deflecting or reigniting, and the arc extinguishing stability can be improved.
[0120] In other alternative embodiments, the distance between the tip of the second discharge tip 8 and the adjacent first discharge tips 7 in the second direction may not be equal, as long as the transmission of the electric arc can be achieved.
[0121] like Figure 5 , Figure 6 and Figure 8 As shown, the first arc-extinguishing grid plate 43 is provided with a first groove 101. The two ends of the first groove 101 in the second direction and the end facing the first sidewall 61 in the first direction penetrate the first arc-extinguishing grid plate 43. The first discharge tip 7 is fixed to the bottom of the first groove 101. The first groove 101 can increase the size of the air intake channel 23 in the first direction, thereby reducing the flow resistance of gas in the air intake channel 23, allowing more gas to enter the air intake channel 23, and allowing more electric arc to be blown into the air intake channel 23 by the gas.
[0122] like Figure 5 and Figure 8 As shown, the two ends of the first discharge tip 7 in the second direction are flush with the two ends of the first arc-extinguishing grid plate 43 in the second direction, so as to avoid gas accumulation in the first groove 101 to form airflow turbulence, so as to ensure the smooth transmission of the electric arc. It can also prevent the electric arc from accumulating in the first groove 101, which would make it difficult for heat to dissipate and burn out the first arc-extinguishing grid plate 43.
[0123] Furthermore, such as Figure 5 and Figure 8 As shown, the first discharge tip 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. The two ends of the second groove 102 penetrate the first arc-extinguishing grid plate 43 in the second direction. The second groove 102 is used to increase the distance between the first arc-extinguishing grid plate 43 and the first sidewall 61 on both sides of the first discharge tip 7, making it easier for the arc to accumulate at the tip of the first discharge tip 7. The through-hole design of the second groove 102 also prevents the accumulation of gas and arc.
[0124] In other alternative implementations, the second groove 102 may not be provided, and the first discharge tip 7 may have a planar structure on both sides in the third direction.
[0125] This embodiment provides a circuit breaker with two arc-extinguishing chambers. However, in other alternative embodiments, the first arc-extinguishing chamber 2 in this embodiment can 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 basically the same as those in embodiment 1, except that:
[0128] like Figure 9 As shown, two first arc-extinguishing grid plates 43 are provided between two adjacent second discharge tips 8 in the second direction. In this state, only one of the two first arc-extinguishing grid plates 43 located between two adjacent second discharge tips 8 needs to be provided with a first discharge tip 7.
[0129] In other alternative embodiments, the number of first arc-extinguishing grid plates 43 between two adjacent second discharge apexes 8 in the second direction can be other than those that can satisfy the continuous transmission of the arc.
[0130] Example 3
[0131] The circuit breaker and the first arc-extinguishing chamber 2 in this embodiment are basically the same as those in embodiment 1, except that:
[0132] like Figure 10 As shown, the first discharge tip 7 extends along a third direction, and the two inclined surfaces of the first discharge tip 7 intersect in a second direction to form the tip of the first discharge tip 7. The second discharge tip 8 extends along a third direction, and the two inclined surfaces of the second discharge tip 8 intersect in a second direction to form the tip of the second discharge tip 8.
[0133] Example 4
[0134] The circuit breaker and the first arc-extinguishing chamber 2 in this embodiment are basically the same as those in embodiment 1, except that:
[0135] like Figure 11 As shown, the first discharge tip 7 extends along the second direction, and the two inclined planes of the first discharge tip 7 intersect in the third direction to form the tip of the first discharge tip 7. The second discharge tip 8 extends along the second direction, and the two inclined planes of the second discharge tip 8 intersect in the third direction to form the tip of the second discharge tip 8.
[0136] Example 5
[0137] The circuit breaker and the first arc-extinguishing chamber 2 in this embodiment are basically the same as those in embodiment 1, except that:
[0138] like Figure 12 As shown, the first discharge tip 7 extends along the second direction, and the two inclined planes of the first discharge tip 7 intersect in the third direction to form the tip of the first discharge tip 7. The second discharge tip 8 extends along the second direction, and the two inclined planes of the second discharge tip 8 intersect in the third direction to form the tip of the second discharge tip 8.
[0139] Example 6
[0140] The circuit breaker and the first arc-extinguishing chamber 2 in this embodiment are basically the same as those in embodiment 1, except that the shape of the discharge tip is different.
[0141] It should be noted that the discharge tip in this embodiment can be either the first discharge tip in Embodiment 1 or the second discharge tip in Embodiment 1.
[0142] The following description uses the discharge tip angle in this embodiment as the second discharge tip angle in Embodiment 1 as an example.
[0143] Specifically, such as Figure 13 As shown, the cross-section of the second discharge tip 8 in the vertical plane is trapezoidal. The second discharge tip 8 includes a first side surface 82, a second side surface 83, and a collector end surface 84. The first side surface 82 and the second side surface 83 are the two end surfaces of the second discharge tip 8 in the second direction, respectively. The collector end surface 84 is the end surface of the second discharge tip 8 facing the first arc-extinguishing grid group in the first direction, which corresponds to the tip of the second discharge tip 8 in Embodiment 1. The first side surface 82 and the second side surface 83 are inclined towards each other at the end facing the first arc-extinguishing grid group in the first direction, so that the distance between the first side surface 82 and the second side surface 83 facing the first sidewall in the second direction is greater than the distance between the first side surface 82 and the second side surface 83 facing the first arc-extinguishing grid group in the second direction.
[0144] Although the current collector facet 84 in this embodiment is not a sharp point, controlling its length in the second direction within a certain small range can still achieve the effect of current collection. The specific range of the current collector facet 84's length in the second direction required to collect current is prior art, and those skilled in the art can design it according to actual needs.
[0145] In the description of this utility model, it should be understood that the terms "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", and "outer" indicate the orientation or positional relationship based on the orientation or positional relationship of the device or component shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or component referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.
[0146] While specific embodiments of this utility model have been described above, those skilled in the art should understand that these are merely illustrative examples, and the scope of protection of this utility model is defined by the appended claims. Those skilled in the art can make various changes or modifications to these embodiments without departing from the principles and essence of this utility model, but all such changes and modifications fall within the scope of protection of this utility model.
Claims
1. An arc extinguishing chamber, comprising a housing, an arc guide, and a first arc extinguishing grid assembly arranged inside the housing, a first arc entry passage is arranged on a first side wall of the housing, the arc guide covers an inner wall surface of the housing wall of the first side wall and is detachably connected with the housing, the first arc extinguishing grid assembly comprises a first arc extinguishing grid group arranged opposite to the housing 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 form an air inlet passage in a first direction, the first direction is the wall thickness direction of the first side wall, characterized in that, At least part of the first arc extinguishing fins in the first arc extinguishing fin group is provided with a first discharge sharp corner, the arc guiding fin is provided with a second discharge sharp corner on an end surface facing the first arc extinguishing fin group, the first discharge sharp corner and the second discharge sharp corner form a continuous discharge path, and a current direction of the discharge path is consistent with a flow direction of the gas in the gas inlet channel.
2. The arc chute of claim 1, wherein, The first discharge sharp corner is arranged at an end of the first arc extinguishing fin facing the first side wall, and a tip of the first discharge sharp corner and a tip of the second discharge sharp corner are oppositely arranged in a first direction. The number of the first discharge sharp corners and the number of the second discharge sharp corners are both plural, and the plural first discharge sharp corners and the plural second discharge sharp corners are sequentially and staggeredly arranged in a second direction, and the second direction is a direction in which the plural first arc extinguishing fins are arranged at intervals.
3. The arc chute of claim 2, wherein, The second discharge sharp corner is arranged between two first arc extinguishing fins adjacent in the second direction, and the two first arc extinguishing fins adjacent to the second discharge sharp corner in the second direction are both provided with the first discharge sharp corner.
4. The arc chute of claim 3, wherein, In the second direction, a distance from the tip of the second discharge sharp corner to between the two first discharge sharp corners adjacent in the second direction is the same.
5. The arc chute of claim 2, wherein, The first discharge sharp corner and the second discharge sharp corner at least partially overlap in a third direction. The third direction is perpendicular to a plane composed of the first direction and the second direction.
6. The arc chute of claim 5, wherein, The first discharge sharp corner extends along the second direction, and two inclined surfaces of the first discharge sharp corner in the third direction intersect to form the tip of the first discharge sharp corner. The first discharge sharp corner extends along the third direction, and two inclined surfaces of the first discharge sharp corner in the second direction intersect to form the tip of the first discharge sharp corner.
7. The arc chute of claim 5, wherein, The second discharge sharp corner extends along the third direction, and two inclined surfaces of the second discharge sharp corner in the second direction intersect to form the tip of the second discharge sharp corner. The second discharge sharp corner extends along the second direction, and two inclined surfaces of the second discharge sharp corner in the third direction intersect to form the tip of the second discharge sharp corner.
8. The arc chute of claim 2, wherein, The first discharge sharp corner extends along the second direction, and two inclined surfaces of the first discharge sharp corner in the third direction intersect to form the tip of the first discharge sharp corner. The first discharge sharp corner includes a plurality of first discharge sharp corner units sequentially arranged in the third direction, and the second discharge sharp corner includes a plurality of second discharge sharp corner units sequentially arranged in the third direction, the number of the first discharge sharp corner units in a single first discharge sharp corner is the same as and one-to-one corresponds to the number of the second discharge sharp corner units in a single second discharge sharp corner. The third direction is perpendicular to a plane composed of the first direction and the second direction.
9. The arc chute of claim 8, wherein, The second discharge sharp corner extends along the third direction, and two inclined surfaces of the second discharge sharp corner in the second direction intersect to form the tip of the second discharge sharp corner. The width of the first discharge sharp corner unit in the third direction is equal to the length of the corresponding second discharge sharp corner unit in the third direction.
10. The arc chute of claim 2, wherein The first arc-extinguishing vane is provided with a first recess, two ends of the first recess in the second direction and one end of the first recess in the first direction towards the first side wall penetrate the first arc-extinguishing vane, and the first discharge sharp corner is fixed at the bottom of the first recess.
11. The arc chute of claim 10, wherein, The first discharge sharp corner extends along the second direction, and two inclined surfaces of the first discharge sharp corner in the third direction intersect to form a tip of the first discharge sharp corner, and the third direction is perpendicular to a plane formed by the first direction and the second direction. Two end surfaces of the first discharge sharp corner in the second direction are flush with two end surfaces of the first arc-extinguishing vane in the second direction.
12. The arc chute of claim 11, wherein, Two sides of the first discharge sharp corner in the third direction are provided with a second recess, the bottom of the first recess is recessed in the first direction to form the second recess, and two ends of the second recess in the second direction penetrate the first arc-extinguishing vane.
13. The arc chute defined in any one of claims 2 to 12 wherein, The first arc-extinguishing vane assembly further comprises a second arc-extinguishing vane group arranged opposite to the first arc-extinguishing vane group, the second arc-extinguishing vane group comprises a plurality of first arc-extinguishing vanes arranged at intervals, and at least the first arc-extinguishing vanes close to the first arc-extinguishing vane group in the second arc-extinguishing vane group are provided with the first discharge sharp corner.
14. A circuit breaker characterized by, An arc-extinguishing chamber comprising any one of the arc-extinguishing chambers according to claims 1-13.
15. The circuit breaker of claim 14, wherein, The circuit breaker comprises a first arc-extinguishing chamber and a second arc-extinguishing chamber, the first arc-extinguishing chamber communicates with the second arc-extinguishing chamber, the direction of the first arc-extinguishing chamber is at an angle with the direction of the second arc-extinguishing chamber, the first arc-extinguishing chamber is any one of the arc-extinguishing chambers according to claims 1-13, and the stationary contact of the circuit breaker is arranged on the first arc-extinguishing chamber.