Arc extinguishing device of switch and grid arc extinguishing and circuit breaking system

Abstract

The utility model provides an arc extinguishing device of a switch and a grid plate arc extinguishing circuit breaking system. The arc extinguishing device comprises a contact assembly and a plurality of arc extinguishing grid plate groups. And a plurality of arc extinguishing grids are arranged in each arc extinguishing grid group. A gap is formed between every two adjacent arc extinguishing grid sheet groups, and electric arcs are stretched in the gaps and move in the direction away from the contact assembly. At least one magnet is arranged in the gap, the extending direction of the at least one magnet is consistent with the stretching direction of the arc, and the plane where the at least one magnet is located is perpendicular to the arrangement direction of the arc extinguishing grid pieces. The problem that the arc extinguishing effect is affected by slow arc transfer and arc stagnation in the prior art is solved.

Description

Technical Field

[0001] An arc-extinguishing device for a switch and a grid-type arc-extinguishing circuit breaking system Background Technology

[0002] A circuit breaker is a switching device that can close, carry, and interrupt current in a normal circuit, and at the same time, close, carry, and interrupt current in an abnormal circuit within a specified time.

[0003] Typically, a circuit breaker consists of moving contacts, stationary contacts, and an arc-extinguishing chamber. The moving and stationary contacts are connected to the circuit. When the moving and stationary contacts break, an electric arc is generated. This arc is extinguished by arc-extinguishing grids installed within the arc-extinguishing chamber. To improve the breaking performance of the switch, the number of grids within the arc-extinguishing chamber is usually increased to raise the arc voltage during breaking. Multiple arc-extinguishing units are installed within the arc-extinguishing chamber, arranging more grids within a limited space. When an arc is generated, it elongates as the moving contact moves and moves towards the outlet of the arc-extinguishing chamber. The arc first enters the arc-extinguishing unit closest to the moving and stationary contacts and then continues moving towards the outlet. During this movement, the self-excitation magnetic field experienced by the arc is relatively weak, resulting in slow arc transfer and arc stagnation, thus affecting the arc-extinguishing effect.

[0004] It is evident that existing technologies suffer from drawbacks such as slow arc transfer and arc stagnation, which in turn affect the arc extinguishing effect. Summary of the Invention

[0005] This invention provides an arc-extinguishing device for a switch, which solves the problems of slow arc transfer and arc stagnation in the prior art, thus affecting the arc-extinguishing effect.

[0006] This utility model provides an arc extinguishing device for a switch, including a contact assembly and multiple arc extinguishing grid groups; each arc extinguishing grid group has multiple arc extinguishing grids.

[0007] There is a gap between two adjacent arc-extinguishing grid groups, and the arc elongates within the gap and moves away from the contact assembly.

[0008] At least one magnet is provided in the gap, the extension direction of the at least one magnet is consistent with the elongation direction of the electric arc, and the plane in which the at least one magnet is located is perpendicular to the arrangement direction of the arc-extinguishing grid.

[0009] This invention, by placing a magnet in the gap (or arc transfer zone) between two adjacent arc-extinguishing grid groups, allows the arc to move due to the traction force provided by the magnetic field. As the arc is stretched, it is further stretched by the traction force of the magnet 3, eventually allowing the arc to enter the last arc-extinguishing grid group. This invention can effectively improve the arc stretching ability, reduce the arc's dwell time in the transfer zone, reduce or avoid the occurrence of slow arc transfer or arc stagnation, and thus achieve a better arc extinguishing effect.

[0010] Optionally, the magnet may be a metal sheet and / or a permanent magnet.

[0011] Optionally, the multiple arc-extinguishing grid groups include a first arc-extinguishing grid group, a second arc-extinguishing grid group, and a third arc-extinguishing grid group;

[0012] The first and second arc-extinguishing grid groups are arranged opposite each other and located on both sides of the contact assembly, and the third arc-extinguishing grid group is located on the upper side of the first and second arc-extinguishing grid groups away from the contact assembly.

[0013] At least one magnet extends in a T-shape.

[0014] Optionally, at least one magnet includes a first metal sheet and a second metal sheet, which are spaced apart along the arc elongation direction and arranged in a T-shape.

[0015] Optionally, at least one magnet includes a first permanent magnet and a second permanent magnet, which are spaced apart along the arc elongation direction and arranged in a T-shape, with the opposite ends of the first permanent magnet and the second permanent magnet having the same polarity.

[0016] This embodiment of the invention, by placing permanent magnets of the same polarity opposite to each other, can achieve a pulling force to the upper left or upper right when the arc passes through the transfer zone (this direction depends on the direction of current flow), which can accelerate the arc transfer speed and improve the arc extinguishing efficiency.

[0017] Optionally, there may be at least one magnet or multiple magnets, including at least one magnet group, each magnet group including multiple magnets, and the multiple magnets in each magnet group are stacked along a first direction; wherein, the first direction is perpendicular to the elongation direction of the electric arc and perpendicular to the arrangement direction of the arc-extinguishing grid.

[0018] Optionally, multiple magnets in each magnet group are spaced apart along a first direction.

[0019] Optionally, the two magnets closest to the arc in each magnet group have the same magnetic properties on their side surfaces, which are arranged opposite each other along a first direction.

[0020] Optionally, the arc-extinguishing device of the switch also includes a magnet holder, which is disposed within the gap and has multiple slots, with each magnet inserted into a corresponding slot.

[0021] This utility model also provides a grid-plate arc-extinguishing circuit breaking system, including the arc-extinguishing device of the switch involved in the above embodiments and possible implementations. Attached Figure Description

[0022] Figure 1 The schematic diagram of the arc-extinguishing device of the switch in this embodiment of the present invention is shown below, wherein there are two sets of arc-extinguishing grid plates and one magnet;

[0023] Figure 2 The schematic diagram of the arc-extinguishing device of the switch in this embodiment is shown below, wherein there are two sets of arc-extinguishing grid plates and multiple magnets;

[0024] Figure 3 This is a schematic diagram of the arc-extinguishing device of the switch in an embodiment of the present invention, wherein there is one magnet, and the magnet is a metal sheet;

[0025] Figure 4 This is a schematic diagram of the arc-extinguishing device of the switch in an embodiment of the present invention, wherein there are two magnets, and the magnets are metal sheets;

[0026] Figure 5 This is a schematic diagram of the arc-extinguishing device of the switch in an embodiment of the present invention, wherein there is one magnet, and the magnet is a permanent magnet;

[0027] Figure 6 This is a schematic diagram of the arc-extinguishing device of the switch in an embodiment of the present invention, wherein there are two magnets, and the magnets are permanent magnets;

[0028] Figure 7 This is a side view of the arc-extinguishing device of the switch in an embodiment of the present invention, showing that the multiple magnets include multiple magnet groups.

[0029] Explanation of reference numerals in the attached figures:

[0030] 1: Arc-extinguishing device of the switch;

[0031] 11: Contact assembly; 120: Gap; 121A: Arc extinguishing grid assembly; 121B: Arc extinguishing grid assembly; 121: First arc extinguishing grid assembly; 122: Second arc extinguishing grid assembly; 123: Third arc extinguishing grid assembly; 124: Arc extinguishing grid;

[0032] 13: Magnet; 131: First metal sheet; 132: Second metal sheet; 133: First permanent magnet; 134: Second permanent magnet; 13A: First magnet group; 13B: Second magnet group;

[0033] 141: First guide plate; 142: Second guide plate;

[0034] X: Arrangement direction of the arc-extinguishing grid; Y: Arc elongation direction; Z: First direction. Detailed Implementation

[0035] The present invention will now be described in detail with reference to the accompanying drawings and specific embodiments. This embodiment is based on the technical solution of the present invention and provides detailed implementation methods and specific operating procedures; however, the scope of protection of the present invention is not limited to the following embodiments.

[0036] It should be noted that in this specification, similar reference numerals and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0037] In the description of this embodiment, it should be noted that the terms "upper", "lower", "inner", "bottom", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship that the utility model product is usually placed in during use. They are only for the convenience of describing the utility model and simplifying the description, and do not indicate or imply that the device or element 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 the utility model.

[0038] The terms “first”, “second”, etc., are used only to distinguish descriptions and should not be interpreted as indicating or implying relative importance.

[0039] In the description of this embodiment, it should also be noted that, unless otherwise explicitly specified and limited, the terms "set up," "connected," and "linked" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this embodiment based on the specific circumstances.

[0040] To make the objectives, technical solutions, and advantages of this utility model clearer, the embodiments of this utility model will be described in further detail below with reference to the accompanying drawings.

[0041] This utility model provides an arc-extinguishing device 1 for a switch, such as Figure 1 As shown, it includes a contact assembly 11 and multiple arc-extinguishing grid groups (e.g., arc-extinguishing grid group 121A and arc-extinguishing grid group 121B). Each arc-extinguishing grid group has multiple arc-extinguishing grids 124.

[0042] There is a gap 120 between two adjacent arc-extinguishing grid groups (e.g., arc-extinguishing grid group 121A and arc-extinguishing grid group 121B). This gap 120 is the arc transfer zone, in which the arc is elongated and moves away from the contact assembly 11.

[0043] At least one magnet (e.g.) is provided within the gap 120. Figure 1 As shown in the figure, at least one magnet extends in the same direction as the arc elongation direction Y, and the plane containing at least one magnet is perpendicular to the arrangement direction X of the arc-extinguishing grid. Alternatively, it can be understood that the length direction of magnet 13 is parallel to the arc elongation direction Y, and the surfaces containing the length and width directions of magnet 13 are perpendicular to the arrangement direction X of the arc-extinguishing grid.

[0044] This utility model does not limit the number of arc-extinguishing grid plates or the shape of the gap 120. As long as the magnet 13 is located in the gap 120 and can stretch the arc in the gap 120 and move it away from the contact assembly 11, it does not deviate from the scope of this utility model embodiment.

[0045] This invention provides a magnet 13 within the gap 120 (or arc transfer zone) between two adjacent arc-extinguishing grid groups (e.g., arc-extinguishing grid group 121A and arc-extinguishing grid group 121B). Because the magnetic field provides traction to maintain arc movement, the arc is further elongated by the traction force of the magnet 13 during the elongation process, ultimately allowing the arc to enter the last arc-extinguishing grid group (e.g., arc-extinguishing grid group 121A). This invention effectively improves the arc elongation capability, reduces the arc's dwell time in the arc transfer zone, and reduces or avoids slow arc transfer or arc stagnation, thus achieving a superior arc-extinguishing effect.

[0046] Those skilled in the art will understand that magnet 13 can be understood as an entity capable of generating a magnetic field. In one embodiment, magnet 13 can be a permanent magnet, such as a magnet. In other alternative embodiments, magnet 13 can also be a magnetized metal sheet. The magnetic field strength of a permanent magnet is constant, and the metal sheet can be magnetized by external magnetic field intervention. The external magnetic field can be a constant magnetic field strength or a changing magnetic field strength, and this invention does not limit this.

[0047] The above-mentioned at least one magnet 13 can be understood to mean that the number of magnets 13 in this invention is not limited, and can be one, such as Figure 1 As shown, the shape of the matching gap 120 of the magnet 13 is set to L-shape, but there can also be multiple gaps, such as... Figure 2 As shown, multiple magnets 13 are spaced apart along the arc elongation direction Y. The shapes of the multiple magnets 13 can be the same or different, for example... Figure 2As shown, the three magnets 13 have different shapes, being a transverse rectangle, a longitudinal rectangle, and a strip shape respectively along the arc elongation direction Y. In embodiments with multiple magnets, the magnets may be partially made of magnetized metal sheets and partially made of permanent magnets.

[0048] Furthermore, a first arc guide plate 141 and a second arc guide plate 142 are provided in the gap 120. The first arc guide plate 141 and the second arc guide plate 142 are arranged at intervals relative to each other along the arrangement direction X of the arc extinguishing grid. The magnet 13 is located between the first arc guide plate 141 and the second arc guide plate 142.

[0049] In one implementation, such as Figure 3 As shown, the multiple arc-extinguishing grid groups include a first arc-extinguishing grid group 121, a second arc-extinguishing grid group 122, and a third arc-extinguishing grid group 123;

[0050] The first arc-extinguishing grid group 121 and the second arc-extinguishing grid group 122 are arranged opposite each other and located on both sides of the contact assembly 11. The third arc-extinguishing grid group 123 is located on the upper side of the first arc-extinguishing grid group 121 and the second arc-extinguishing grid group 122 away from the contact assembly 11. At least one magnet 13 extends in a T-shape.

[0051] Wherein, at least one magnet 13 can be understood to mean that the number of magnets 13 can be one (e.g., Figure 3 As shown), it can also be multiple (such as...). Figure 4 As shown), the multiple magnets 13 extend in a T-shape, or can be understood as the multiple magnets 13 being distributed in a T-shape.

[0052] In one implementation, please refer to Figure 3 Magnet 13 is a T-shaped metal sheet. In one embodiment, please refer to [reference needed]. Figure 4 At least one magnet includes a first metal sheet 131 and a second metal sheet 132, the first metal sheet 131 and the second metal sheet 132 are spaced apart along the arc elongation direction Y and are distributed in a T-shape.

[0053] In one implementation, please refer to Figure 5 Magnet 13 is a T-shaped permanent magnet. In one embodiment, please refer to [reference needed]. Figure 6 At least one magnet includes a first permanent magnet 133 and a second permanent magnet 134. The first permanent magnet 133 and the second permanent magnet 134 are arranged at intervals along the arc elongation direction Y and are distributed in a T-shape. The opposite ends of the first permanent magnet 133 and the second permanent magnet 134 have the same polarity.

[0054] This embodiment of the invention, by placing permanent magnets of the same polarity opposite to each other, can achieve a pulling force to the upper left or upper right when the arc passes through the transfer zone (this direction depends on the direction of current flow), which can accelerate the arc transfer speed and improve the arc extinguishing efficiency.

[0055] In a further implementation, such as Figure 7 As shown, there are at least one magnet and multiple magnets, including at least one magnet group (e.g., first magnet group 13A and second magnet group 13B). Each magnet group includes multiple magnets, and the multiple magnets in each magnet group (e.g., first magnet group 13A or second magnet group 13B) are stacked along a first direction Z; wherein, the first direction Z is perpendicular to the elongation direction Y of the electric arc and perpendicular to the arrangement direction X of the arc extinguishing grid.

[0056] In each magnet group, the multiple magnets can be stacked together without gaps or spaced apart.

[0057] In one embodiment, multiple magnets in each magnet group are spaced apart along a first direction Z. In a further embodiment, the arc extinguishing device of the switch also includes a magnet holder (not shown in the figure), the magnet holder is disposed in the gap, and the magnet holder is provided with multiple slots, each magnet being inserted into a corresponding slot.

[0058] In one implementation, such as Figure 7 As shown, the two magnets closest to the electric arc in each magnet group have identical magnetic properties on their side surfaces, which are positioned opposite each other along the first direction Z. Figure 7 As shown, in the first magnet group 13A, the opposing side surfaces of the two magnets 13 are both S poles, and the opposite side surfaces are both N poles. In the second magnet group 13B, the opposing side surfaces of the two magnets 13 are both S poles, and the opposite side surfaces are both N poles.

[0059] In a further embodiment, if the number of magnets in each magnet group is greater than two, the remaining magnets can be magnetically attracted to, for example, the side surface of the magnet closest to the arc that faces away from the arc. For instance, multiple magnets can be magnetically attracted to... Figure 7 The magnet 13 of the first magnet group 13A shown is on the side facing away from the electric arc. In other alternative embodiments, the magnets 13 may not be magnetically attracted to the side facing away from the electric arc. For example, they may be spaced apart, in which case the multiple magnets and the magnet closest to the electric arc have opposite polarities on opposite sides and have magnetic attraction.

[0060] This invention does not limit the placement spacing between the magnets. In actual production or troubleshooting, the distance between the magnets can be adjusted to adjust the magnetic field strength according to actual needs. For example, in one embodiment, the relative distance between multiple magnets in the same magnet group is greater than or equal to the width of a single contact piece. When the relative placement distance of the permanent magnets required for the single-pole arc-extinguishing chamber is relatively far, the magnetic field strength can be adjusted appropriately. When the relative placement distance of the magnetized metal sheets is relatively far, the number or thickness of the metal sheets can be increased.

[0061] In one example of operation, as the electric arc moves towards the outlet, it is first pulled by the lower permanent magnet (e.g., the second magnet group 13B), causing the arc to lengthen further. Upon passing the upper permanent magnet (e.g., the first magnet group 13A), the pulling force provided by the magnetic field continues to maintain the arc's movement, ultimately leading it into the upper arc-extinguishing unit. In this path, the magnetic field strength of the permanent magnets in the direction of arc movement towards the outlet is not necessarily constant. That is, when the number of permanent magnets is not less than one group, the magnetic field strength of the upper permanent magnet (near the outlet) can be greater than or less than the magnetic field strength of the lower permanent magnet (near the arc generation location).

[0062] The preferred embodiments of this utility model have been described in detail above. It should be understood that those skilled in the art can make numerous modifications and variations based on the concept of this utility model without creative effort. Therefore, all technical solutions that can be obtained by those skilled in the art based on the concept of this utility model through logical analysis, reasoning, or limited experimentation on the basis of existing technology should be within the scope of protection defined by the claims.

Claims

1. An arc-extinguishing device for a switch, characterized in that, It includes a contact assembly and multiple arc-extinguishing grid groups; each arc-extinguishing grid group contains multiple arc-extinguishing grids; There is a gap between two adjacent arc-extinguishing grid groups, within which the electric arc elongates and moves away from the contact assembly; At least one magnet is provided in the gap, the extension direction of the at least one magnet is consistent with the elongation direction of the electric arc, and the plane in which the at least one magnet is located is perpendicular to the arrangement direction of the arc-extinguishing grid.

2. The arc-extinguishing device for the switch according to claim 1, characterized in that, The magnet is a metal sheet and / or a permanent magnet.

3. The arc-extinguishing device for the switch according to claim 2, characterized in that, The plurality of arc-extinguishing grid groups include a first arc-extinguishing grid group, a second arc-extinguishing grid group, and a third arc-extinguishing grid group; The first arc-extinguishing grid group and the second arc-extinguishing grid group are arranged opposite to each other and located on both sides of the contact assembly, and the third arc-extinguishing grid group is located on the upper side of the first arc-extinguishing grid group and the second arc-extinguishing grid group away from the contact assembly; The at least one magnet extends in a T-shape.

4. The arc-extinguishing device for the switch according to claim 3, characterized in that, The at least one magnet includes a first metal sheet and a second metal sheet, which are spaced apart along the arc elongation direction and arranged in a T-shape.

5. The arc-extinguishing device for the switch according to claim 3, characterized in that, The at least one magnet includes a first permanent magnet and a second permanent magnet, which are spaced apart along the arc elongation direction and arranged in a T-shape, with the opposite ends of the first permanent magnet and the second permanent magnet having the same polarity.

6. The arc-extinguishing device for a switch according to claim 1, characterized in that, The at least one magnet may be a plurality of magnets, and the plurality of magnets may include at least one magnet group, each magnet group may include a plurality of magnets, and the plurality of magnets in each magnet group may be stacked along a first direction; wherein, the first direction is perpendicular to the elongation direction of the electric arc and perpendicular to the arrangement direction of the arc extinguishing grid.

7. The arc-extinguishing device for a switch according to claim 6, characterized in that, Multiple magnets in each magnet group are spaced apart along the first direction.

8. The arc-extinguishing device for a switch according to claim 7, characterized in that, The two magnets closest to the electric arc in each magnet group have identical magnetic properties on their side surfaces, which are positioned opposite each other along the first direction.

9. The arc-extinguishing device for a switch according to claim 7, characterized in that, It also includes a magnet holder, which is disposed within the gap and has multiple slots, with each magnet inserted into a corresponding slot.

10. A grid-type arc-extinguishing circuit breaking system, characterized in that, The arc-extinguishing device includes the switch as described in any one of claims 1 to 9.

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