Arc extinguishing device and low-voltage switch

Abstract

The utility model provides an arc extinguishing device and a low-voltage switch, and relates to the low-voltage electrical field. The utility model provides an arc extinguishing device, which comprises an arc extinguishing grid plate group and at least one pair of permanent magnets, and is characterized in that two opposite ends of the arc extinguishing grid plate group are respectively connected with two insulating parts; the at least one pair of permanent magnets are symmetrically arranged in the two insulating parts respectively, and two opposite magnetic poles are the same in polarity; and the at least one pair of permanent magnets are inclined at a preset angle so that one ends of the at least two permanent magnets are close to each other. According to the arc extinguishing device obtained through the design, the at least one pair of permanent magnets are obliquely arranged at the preset angle, the arc extinguishing efficiency of the arc extinguishing device can be improved, and rapid arc extinguishing is achieved.

Description

Technical Field

[0001] The utility model relates to the field of low-voltage electrical equipment, and in particular to an arc extinguishing device and a low-voltage switch. Background Art

[0002] In an electric power system, when a circuit is disconnected by an electrical switch such as a low-voltage switch, an arc may form between the static contact of the low-voltage switch and the moving contact moving away from the static contact. The arc contains ionized gas, which contains a large number of free electrons, and the temperature of the arc can usually reach thousands of degrees. The function of the arc extinguishing chamber configured in the low-voltage switch is to extinguish the arc to prevent the arc from damaging the low-voltage switch itself.

[0003] In order to increase the arc extinguishing ability of DC products, it is a beneficial technical measure to use permanent magnets to drive the arc to one side of the arc extinguishing chamber. However, the existing arc extinguishing device usually sets the permanent magnets in parallel on the opposite sides of the arc extinguishing chamber. The arc will be directed to the edge of the permanent magnet, but it cannot contact the grid to cool down and increase the voltage, causing the arc to continue to burn the gas-producing parts, which is easy to weaken the dielectric strength of the gas-producing parts, resulting in the inability to interrupt the arc or dielectric failure after the test. Utility Model Content

[0004] The utility model aims to provide an arc extinguishing device, which can improve the arc extinguishing efficiency of the arc extinguishing device, realize rapid arc extinguishing, and reduce the possibility of the arc extinguishing device being burned.

[0005] The embodiment of the utility model is achieved as follows:

[0006] One aspect of the utility model provides an arc extinguishing device, comprising an arc extinguishing grid group and at least one pair of permanent magnets, wherein the opposite ends of the arc extinguishing grid group are respectively connected to two insulating members; the at least one pair of permanent magnets are respectively symmetrically arranged in the two insulating members and have the same magnetic poles relative to each other, and the at least one pair of permanent magnets are inclined at a preset angle so that one end of the at least two permanent magnets are close to each other.

[0007] Optionally, at least one pair of permanent magnets is inclined at a preset angle so that ends thereof facing the arc extinguishing grid group are away from each other.

[0008] Optionally, at least one pair of permanent magnets is inclined at 5° to 40° relative to the symmetry axis between the two insulating members.

[0009] Optionally, at least one pair of permanent magnets is inclined at a preset angle so that ends away from the arc extinguishing grid group are away from each other.

[0010] Optionally, at least one pair of permanent magnets is inclined at 1° to 35° relative to the symmetry axis between the two insulating members.

[0011] Optionally, the arc extinguishing grid group extends at least one pair of grid legs that are spaced apart and symmetrically distributed, the at least one pair of grid legs are respectively installed in two insulating members, and the grid legs are at least partially arranged on a side of the at least one pair of permanent magnets that are close to each other.

[0012] Optionally, the arc starting point of the arc extinguishing device is arranged along the symmetry axis between the two insulating members and is located on a side of the intersection of the midlines of at least one pair of permanent magnets close to the arc extinguishing grid group.

[0013] Optionally, the two insulating members are spaced apart to form a gap therebetween, and the gap is used to compress the arc.

[0014] Optionally, the insulating member is a gas generating member.

[0015] Another aspect of the utility model provides a low-voltage switch, including an arc extinguishing device.

[0016] The beneficial effects of the present invention include at least one of the following:

[0017] The present application provides an arc extinguishing device, comprising an arc extinguishing grid group and at least one pair of permanent magnets, wherein the two opposite ends of the arc extinguishing grid group are respectively connected to two insulating members; the at least one pair of permanent magnets are respectively symmetrically arranged in the two insulating members and have the same magnetic poles relative to each other, and the at least one pair of permanent magnets are inclined at a preset angle so that one end of the at least two permanent magnets are close to each other. The arc extinguishing device can improve the arc extinguishing efficiency of the arc extinguishing device, realize rapid arc extinguishing, and reduce the possibility of the arc extinguishing device being burned by arranging the pair of permanent magnets at a preset angle.

[0018] The present application also provides a low-voltage switch, comprising the above-mentioned arc extinguishing device. The low-voltage switch can cut the arc more effectively through the arc extinguishing device, achieve rapid arc extinguishing, and improve the safety and reliability of the low-voltage switch. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the technical solutions of the embodiments of the utility model, the drawings required for use in the embodiments will be briefly introduced below. It should be understood that the following drawings only show certain embodiments of the utility model and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other relevant drawings can be obtained based on these drawings without paying creative work.

[0020] Figure 1 One of the structural schematic diagrams of the arc extinguishing device provided in the embodiment of the utility model;

[0021] Figure 2 The second structural schematic diagram of the arc extinguishing device provided in the embodiment of the utility model;

[0022] Figure 3The third structural diagram of the arc extinguishing device provided in the embodiment of the utility model;

[0023] Figure 4 One of the cross-sectional schematic diagrams of the arc extinguishing device provided in the embodiment of the utility model;

[0024] Figure 5 The second cross-sectional schematic diagram of the arc extinguishing device provided in the embodiment of the utility model.

[0025] Icons: 100 - arc extinguishing device; 110 - arc extinguishing grid group; 111 - arc extinguishing grid; 112 - grid leg; 120 - insulating member; 130 - permanent magnet; 140 - gap. DETAILED DESCRIPTION

[0026] In order to make the purpose, technical scheme and advantages of the embodiments of the utility model clearer, the technical scheme in the embodiments of the utility model will be clearly and completely described below in conjunction with the drawings in the embodiments of the utility model. Obviously, the described embodiments are part of the embodiments of the utility model, not all of the embodiments. Generally, the components of the embodiments of the utility model described and shown in the drawings here can be arranged and designed in various different configurations.

[0027] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the present invention to be protected, but merely represents selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0028] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, further definition and explanation thereof is not required in subsequent drawings.

[0029] In the description of the present utility model, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inside", "outside", etc. indicate the orientation or position relationship based on the orientation or position relationship shown in the accompanying drawings, or the orientation or position relationship in which the utility model product is usually placed when in use, which is only for the convenience of describing the utility model and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present utility model. In addition, the terms "first", "second", "third", etc. are only used to distinguish the description, and cannot be understood as indicating or implying relative importance.

[0030] In addition, the terms "horizontal", "vertical" and the like do not mean that the components are required to be absolutely horizontal or suspended, but can be slightly tilted. For example, "horizontal" only means that its direction is more horizontal than "vertical", and does not mean that the structure must be completely horizontal, but can be slightly tilted.

[0031] In the description of the present invention, it is also necessary to explain that, unless otherwise clearly specified and limited, the terms "set", "install", "connect", and "connect" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0032] Please refer to Figure 1 and Figure 2 In one aspect of an embodiment of the present application, an arc extinguishing device 100 is provided, comprising an arc extinguishing grid group 110 and at least one pair of permanent magnets 130, wherein the opposite ends of the arc extinguishing grid group 110 are respectively connected to two insulating members 120; the at least one pair of permanent magnets 130 are respectively symmetrically arranged in the two insulating members 120 and have the same magnetic poles relative to each other, and the at least one pair of permanent magnets 130 are inclined at a preset angle so that one end of at least two permanent magnets 130 are close to each other.

[0033] Specifically, Figure 1 and Figure 2 As shown, the present application provides an arc extinguishing device 100, which includes an arc extinguishing grid group 110, which is composed of a plurality of arc extinguishing grids stacked in sequence; opposite ends of arc extinguishing grids 111 in the arc extinguishing grid group 110 are respectively connected to two insulating members 120. In a possible implementation scheme of the present application, the arc extinguishing grids 111 in the arc extinguishing grid group 110 extend at least one pair of grid leg portions 112 that are spaced apart and symmetrically distributed along the plane where the arc extinguishing grids 111 are located, and at least one pair of grid leg portions 112 are respectively installed in the two insulating members 120, so that the arc extinguishing grid group 110 is connected to the two insulating members 120.

[0034] The arc extinguishing device 100 further includes at least one pair of permanent magnets 130, which are symmetrically arranged in the two insulating members 120, and the N poles and S poles of the pair of permanent magnets 130 are arranged in the same direction. The pair of permanent magnets 130 are inclined at a preset angle so that one end of the pair of permanent magnets 130 is close to each other. When the permanent magnets 130 include multiple pairs, the multiple pairs of permanent magnets 130 can be arranged in the two insulating members 120 along their height direction, so that the arc can be drawn into a wave shape, so that the arc length is longer and the arc voltage is higher, which can improve the arc extinguishing efficiency of the arc extinguishing device 100.

[0035] It should be noted that, first, a pair of permanent magnets 130 of the existing arc extinguishing device 100 are usually arranged in parallel inside the insulating part 120, so that the arc starting point is located on the side of the intersection of the midlines of the two permanent magnets 130 away from the arc extinguishing grid group 110. Due to the distance from the arc extinguishing grid group 110, it is difficult for the arc to enter the arc extinguishing grid group 110, and the arc will continue to burn the insulating part 120, thereby reducing the arc extinguishing efficiency and reliability of the arc extinguishing device 100.

[0036] In one possible implementation of the present application, Figure 4 As shown, at least one pair of permanent magnets 130 is inclined at a preset angle so that the ends facing the arc extinguishing grid group 110 are away from each other, so that the pair of permanent magnets 130 are in an outward-facing eight structure. Such an arrangement can make the grid leg 112 extend longer along the arrangement of the permanent magnets 130, thereby increasing the heat capacity. In another possible implementation of the present application, as Figure 5 As shown, at least one pair of permanent magnets 130 is tilted at a preset angle so that the ends away from the arc extinguishing grid set 110 are away from each other, so that the pair of permanent magnets 130 are in an inner eight structure. Such a setting can ensure that the arc starting point is always located at the side of the midline intersection of the two permanent magnets 130 close to the arc extinguishing grid set 110, so that the arc is always subjected to a force moving toward the arc extinguishing grid set 110. The above two possible implementation methods both improve the arc extinguishing efficiency of the arc extinguishing device 100 by tilting at least one pair of permanent magnets 130 at a preset angle, so as to quickly extinguish the arc and reduce the possibility of the arc extinguishing device 100 being burned.

[0037] Second, the arc extinguishing grid group 110 extends at least one pair of grid legs 112 that are spaced apart and symmetrically distributed, and at least one pair of grid legs 112 are respectively installed in two insulating members 120, and at least part of the grid legs 112 is arranged on the side of at least one pair of permanent magnets 130 that are close to each other. Figure 3 , Figure 4 and Figure 5 As shown, a pair of grid leg portions 112 are respectively installed in two insulating members 120, and the grid leg portions are at least partially arranged on the side where the two permanent magnets 130 are close to each other, so as to facilitate the arc to be moved toward the arc extinguishing grid set 110 by the permanent magnets 130 to cut the arc more quickly and effectively, thereby realizing rapid arc extinguishing. When at least one pair of permanent magnets 130 are inclined at a preset angle so that the ends facing the arc extinguishing grid set 110 are away from each other, such an arrangement can make the grid leg portions 112 extend longer along the arrangement of the permanent magnets 130, so as to improve the heat capacity of the arc extinguishing device 100.

[0038] Third, since at least two grid leg portions 112 are symmetrically distributed at intervals, and at least two permanent magnets 130 are symmetrically distributed at intervals in the two insulating members 120, the moving contact and the stationary contact of the low-voltage switch are preferably arranged between the two insulating members 120 to ensure that the arc generated when the moving contact and the stationary contact are in contact or separated can be driven into the arc-extinguishing grid group 110 by the magnetic force of the two permanent magnets 130, wherein the stationary contact is preferably arranged at the bottom along the stacking direction of the arc-extinguishing grids 111;

[0039] Since the arc extinguishing grid group 110 is formed by stacking a plurality of arc extinguishing grids 111 in sequence, the arc extinguishing grid group 110 has a certain thickness, and correspondingly, the two insulating members 120 connected to the grid leg portions 112 of the arc extinguishing grid group 110 also have a certain height. Among them, a static silver point is provided on the side of the static contact facing the moving contact. In order to further enable the permanent magnet 130 to act on the arc and improve the arc striking and arc extinguishing effects of the arc extinguishing device 100, preferably, the permanent magnet 130 is provided at two-thirds of the height of the surface of the insulator from the static silver point along the stacking direction of the arc extinguishing grid 111.

[0040] The present application provides an arc extinguishing device 100, comprising an arc extinguishing grid group 110 and at least one pair of permanent magnets 130, wherein opposite ends of the arc extinguishing grid group 110 are respectively connected to two insulating members 120; at least one pair of permanent magnets 130 are respectively symmetrically arranged in the two insulating members 120 and have the same magnetic poles relative to each other, and at least one pair of permanent magnets 130 are inclined at a preset angle so that one end of at least two permanent magnets 130 is close to each other. The arc extinguishing device 100 can improve the arc extinguishing efficiency of the arc extinguishing device 100, achieve rapid arc extinguishing, and reduce the possibility of the arc extinguishing device 100 being burned by arranging the pair of permanent magnets 130 at a preset angle.

[0041] At least one pair of grid leg portions 112 are spaced and symmetrically distributed. When at least one pair of permanent magnets 130 is tilted at a preset angle so that one end facing the arc-extinguishing grid group 110 is away from each other, preferably, the pair of permanent magnets 130 is tilted by 5° to 40° relative to the symmetry axis between the two insulating members 120;

[0042] When at least one pair of permanent magnets 130 is inclined at a preset angle so that the ends away from the arc extinguishing grid set 110 are away from each other, preferably, the pair of permanent magnets 130 is inclined by 1° to 35° relative to the symmetry axis between the two insulating members 120 .

[0043] For example, the arc starting point of the arc extinguishing device 100 is arranged along the symmetry axis between the two insulating members 120 and is located at a side of the intersection of the midlines of at least one pair of permanent magnets 130 close to the arc extinguishing grid set 110 .

[0044] Specifically, at least one pair of grid leg portions 112 are spaced apart and symmetrically distributed, and at least one pair of permanent magnets 130 are symmetrically distributed on the opposite sides of the pair of grid leg portions 112; the arc starting point of the arc extinguishing device 100 is set along the symmetry axis between the two insulating members 120, and the arc can be balanced by the permanent magnets 130 on both sides. Figure 4 , Figure 5 As shown, a pair of permanent magnets 130 are symmetrically distributed and inclined at a preset angle, the intersection of the midlines of the two permanent magnets 130 is located on the symmetry axis between the two insulating members 120, and the arc starting point is set on the side of the midline intersection of the two permanent magnets 130 close to the arc extinguishing grid group 110, so that the permanent magnet 130 can move the arc toward the arc extinguishing grid group 110 to cut the arc more quickly and effectively, thereby achieving rapid arc extinguishing.

[0045] In an implementation manner of the present application, the two insulating members 120 are spaced apart to form a gap 140 therebetween, and the gap 140 is used to compress the arc.

[0046] Specifically, Figure 3 As shown, the two insulating members 120 are spaced apart, and the two insulating members 120 are respectively connected to the grid leg portions 112 of the arc extinguishing grid group 110, and the pair of grid leg portions 112 are also spaced apart, so that a gap 140 is formed between the two insulating members 120 and the arc extinguishing grid group 110 on one side. When the arc enters the gap 140, it can be compressed by the two insulating members 120, and it is more conducive to the magnetic force of the permanent magnet 130 to move the arc toward one side of the arc extinguishing grid group 110.

[0047] In one possible implementation of the present application, the insulating member 120 is a gas generating member.

[0048] Specifically, when the moving contact and the stationary contact of the low-voltage switch are opened and closed, an arc may be generated; in order to improve the arc extinguishing effect, the insulating member 120 is preferably a gas-generating member. By setting the insulating member 120 as a gas-generating member, gas can be generated to blow the arc in the direction of the arc-extinguishing grid group 110, and the arc is compressed by the two insulating members 120 and the magnetic force of the permanent magnet 130 to move the arc to one side of the arc-extinguishing grid group 110 for arc extinguishing. By setting the insulating member 120 as a gas-generating member, the arc can be blown in the direction of the arc-extinguishing grid group 110, thereby improving the arc extinguishing efficiency.

[0049] Of course, the insulating member 120 can also be a non-gas-generating member. When the moving contact and the stationary contact of the low-voltage switch are opened and closed to generate an arc, the arc can be compressed by the two insulating members 120 and the magnetic force of the permanent magnet 130 to move the arc toward one side of the arc-extinguishing grid group 110 to extinguish the arc. The present application does not impose any restrictions on the specific arrangement of the insulating member 120. In the actual production process, appropriate adjustments can be made according to specific needs, as long as the arc-extinguishing device 100 can effectively extinguish the arc.

[0050] In another aspect of the embodiments of the present application, a low-voltage switch is provided, comprising the arc extinguishing device 100 described above.

[0051] Specifically, the low-voltage switch includes the above-mentioned arc extinguishing device 100, and also includes a static contact and a moving contact that can contact or separate from each other. When the static contact contacts or separates from the moving contact, an arc may be generated, and the arc can be compressed, quickly cut and extinguished by the arc extinguishing device 100. Among them, the specific structure and beneficial effects of the arc extinguishing device 100 have been introduced in detail above and will not be repeated here. The low-voltage switch can cut the arc more effectively through the arc extinguishing device 100, achieve rapid arc extinguishing, and improve the safety and reliability of the low-voltage switch.

[0052] The above description is only an optional embodiment of the utility model and is not intended to limit the utility model. For those skilled in the art, the utility model can have various modifications and changes. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the utility model shall be included in the protection scope of the utility model.

[0053] It should also be noted that the various specific technical features described in the above specific embodiments can be combined in any suitable manner without contradiction. In order to avoid unnecessary repetition, the present utility model will not further describe various possible combinations.

Claims

1. An arc extinguishing device, characterized in that: The invention comprises an arc-extinguishing grid group (110) and at least one pair of permanent magnets (130), wherein opposite ends of the arc-extinguishing grid group (110) are respectively connected to two insulating members (120); the at least one pair of permanent magnets (130) are respectively symmetrically arranged in the two insulating members (120) and have the same magnetic poles relative to each other; the at least one pair of permanent magnets (130) are inclined at a preset angle so that one end of the at least two permanent magnets (130) is close to each other.

2. The arc extinguishing device according to claim 1, characterized in that: The at least one pair of permanent magnets (130) are inclined at a preset angle so that ends thereof facing the arc extinguishing grid set (110) are away from each other.

3. The arc extinguishing device according to claim 2, characterized in that: The at least one pair of permanent magnets (130) is inclined at an angle of 5° to 40° relative to the symmetry axis between the two insulating members (120).

4. The arc extinguishing device according to claim 1, characterized in that: The at least one pair of permanent magnets (130) is inclined at a preset angle so that the ends away from the arc extinguishing grid plate group (110) are away from each other.

5. The arc extinguishing device according to claim 4, characterized in that: The at least one pair of permanent magnets (130) is inclined at 1° to 35° relative to the symmetry axis between the two insulating members (120).

6. The arc extinguishing device according to any one of claims 1 to 5, characterized in that: The arc extinguishing grid group (110) extends at least one pair of grid legs (112) that are spaced apart and symmetrically distributed, the at least one pair of grid legs (112) being respectively installed in the two insulating members (120), and the grid legs (112) being at least partially arranged on a side of the at least one pair of permanent magnets (130) that are close to each other.

7. The arc extinguishing device according to claim 1, characterized in that: The arc starting point of the arc extinguishing device (100) is arranged along the symmetry axis between the two insulating members (120) and is located on a side of the midline intersection of at least the pair of permanent magnets (130) close to the arc extinguishing grid group (110).

8. The arc extinguishing device according to claim 1, characterized in that: The two insulating members (120) are spaced apart to form a gap (140) therebetween, and the gap (140) is used to compress the electric arc.

9. The arc extinguishing device according to claim 1, characterized in that: The insulating component (120) is a gas generating component.

10. A low voltage switch, characterized in that: The arc extinguishing device (100) comprises the arc extinguishing device (100) as claimed in any one of claims 1 to 9.

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