Arc extinguishing device of switch

Abstract

An arc extinguishing device of a switch belongs to the technical field of low-voltage apparatuses. Comprising a plurality of arc extinguishing grid sheets which are arranged at intervals, an outlet of the arc extinguishing device is provided with an exhaust channel, the exhaust channel is communicated in the arrangement direction of the plurality of arc extinguishing grid sheets, the exhaust channel penetrates through at least one of the plurality of arc extinguishing grid sheets, and in the penetrated arc extinguishing grid sheets, the exhaust channel is communicated with the plurality of arc extinguishing grid sheets. And at least one arc extinguishing grid plate divides the exhaust channel into at least three parallel exhaust channels in the width direction of the arc extinguishing grid plate. The arc extinguishing device has the advantages that in the whole gas discharge channel, at least one arc extinguishing grid plate divides the gas discharge channel into a plurality of parallel narrow slit channels which are mutually separated in the width direction of the arc extinguishing grid plate, when high-temperature gas containing metal particles forms an arc in the channel, due to the extrusion effect of the narrow slit channels, the arc voltage is increased, and meanwhile, the arc extinguishing effect of the arc extinguishing grid plate is improved. And smooth discharge of the arc gas from the exhaust channel is ensured.

Description

Technical Field

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

[0002] Switches are indispensable components that protect circuits and electrical facilities in power distribution networks. Take air circuit breakers in the switch category as an example. When breaking fault current, the moving contact of the moving contactor separates from the static contact of the static contactor to cut off the circuit. During this process, an arc is generated between the moving and static contacts. The arc enters the arc extinguishing chamber under the action of air blowing or magnetic blowing, and is divided by several arc extinguishing grids arranged at intervals from each other.

[0003] As is known in the industry, since the high-temperature gas generated when the arc is interrupted is discharged out of the circuit breaker through the exhaust channel behind the arc-extinguishing grids arranged at intervals, in order to ensure smooth exhaust, it is usually practiced to ensure that the exhaust channel has a sufficiently large cross-sectional area. However, in actual situations, since the exhaust channel is filled with high-temperature gas, it is easy to break down in the exhaust channel and form an arc.

[0004] Ensuring smooth discharge of high-temperature gas and reliable arc interruption is what the industry currently hopes to solve. Utility Model Content

[0005] The utility model aims to provide an arc extinguishing device for a switch which can reliably break an arc.

[0006] The task of the utility model is accomplished in this way: an arc extinguishing device for a switch comprises a plurality of arc extinguishing grids arranged at intervals from each other, an exhaust passage is provided at the outlet of the arc extinguishing device, the exhaust passage passes through in the arrangement direction of the plurality of arc extinguishing grids, the exhaust passage penetrates at least one of the plurality of arc extinguishing grids, and among the penetrated arc extinguishing grids, at least one arc extinguishing grid divides the exhaust passage into at least three exhaust paths parallel in the width direction of the arc extinguishing grids.

[0007] In a specific embodiment of the present invention, relative to a single arc-extinguishing grid, the sum of the widths of all exhaust passages divided by the single arc-extinguishing grid in the width direction of the arc-extinguishing grid is between one third and two thirds of the width of the arc-extinguishing grid.

[0008] In another specific embodiment of the present invention, the cross-section of the exhaust passage is rectangular, semicircular, trapezoidal or triangular.

[0009] In yet another specific embodiment of the present invention, the maximum width of the exhaust passage in the width direction of the arc-extinguishing grid is 2 mm to 6 mm.

[0010] In another specific embodiment of the utility model, the switch includes a base, the base constitutes an arc extinguishing device accommodating chamber, the arc extinguishing device is accommodated in the arc extinguishing device accommodating chamber, and the end of the arc extinguishing grid facing the outlet of the arc extinguishing device abuts against the cavity wall of the arc extinguishing device accommodating chamber.

[0011] In a further specific embodiment of the present invention, the exhaust passage penetrates the arc-extinguishing grid to form a notch on the end of the arc-extinguishing grid facing the outlet of the arc-extinguishing device. For a single arc-extinguishing grid, the number of the notches thereon is not less than three. When the several arc-extinguishing grids are arranged at intervals from each other, the notches on each adjacent arc-extinguishing grid are stacked on each other to form an exhaust passage.

[0012] In yet another specific embodiment of the present invention, the exhaust passage penetrates the arc-extinguishing grid to form notches on both sides or one side of one end of the arc-extinguishing grid facing the outlet of the arc-extinguishing device. For a single arc-extinguishing grid, the sum of the number of notches and notches thereon is not less than three. When the several arc-extinguishing grids are arranged at intervals from each other, the corresponding notches on each adjacent arc-extinguishing grid are stacked on each other to form an exhaust passage, and the corresponding notches on each adjacent arc-extinguishing grid are stacked on each other to also form an exhaust passage.

[0013] In a further specific embodiment of the present invention, the exhaust passage penetrates at least two arc-extinguishing grids that are arranged continuously among the plurality of arc-extinguishing grids.

[0014] In a further specific embodiment of the present invention, the number of notches on the arc-extinguishing grids penetrated by the exhaust channels is equal, and the notches are aligned or staggered in the arrangement direction of the arc-extinguishing grids.

[0015] In yet another specific embodiment of the present invention, the numbers of the notches on the arc-extinguishing grids penetrated by the exhaust passages are different and the notches are staggered in the arrangement direction of the arc-extinguishing grids.

[0016] The technical effect of the technical solution provided by the utility model is that: an exhaust channel is arranged at the outlet of the arc extinguishing device, which is connected in the arrangement direction of the above-mentioned several arc extinguishing grids, and the exhaust channel penetrates at least one of the above-mentioned several arc extinguishing grids. Among the penetrated arc extinguishing grids, at least one arc extinguishing grid divides the exhaust channel into at least three exhaust passages parallel to the width direction of the arc extinguishing grid. Therefore, in the entire gas discharge channel, at least one arc extinguishing grid divides the exhaust channel into a plurality of parallel narrow slit channels separated from each other in the width direction of the arc extinguishing grid. When high-temperature gas containing metal particles forms an arc in the channel, the arc voltage is increased due to the squeezing effect of the narrow slit channel, and at the same time, it is ensured that the arc gas is discharged smoothly from the exhaust channel. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 A cross-sectional view of the switch of the utility model in the width direction;

[0018] Figure 2 It is a schematic diagram of the arc extinguishing device of the utility model;

[0019] Figure 3 A diagram showing an embodiment of an arc extinguishing grid;

[0020] Figure 4 The second embodiment of the arc extinguishing device is shown in FIG.

[0021] Figure 5 The three embodiments of the arc extinguishing device are shown in FIG.

[0022] Figure 6 Schematic diagram of four embodiments of the arc extinguishing device;

[0023] Figure 7 Figure 2 is a diagram of five embodiments of the arc extinguishing device. DETAILED DESCRIPTION

[0024] See also Figures 1 to 3 , showing a base 3, a contact system and an arc extinguishing device arranged in the base 3, wherein the contact system includes a moving contact 4 and a stationary contact (not shown in the figure), and the arc extinguishing device includes a plurality of arc extinguishing grids 1 arranged at intervals from each other for extinguishing an arc generated when the moving contact 4 is separated from the stationary contact.

[0025] As the technical key points of the technical solution provided by the utility model: an exhaust channel is provided at the outlet of the arc extinguishing device, which runs through in the arrangement direction of the above-mentioned arc extinguishing grids 1, and the exhaust channel penetrates at least one of the above-mentioned arc extinguishing grids 1. Among the penetrated arc extinguishing grids, at least one arc extinguishing grid divides the exhaust channel into at least three exhaust passages 2 parallel to the width direction of the arc extinguishing grids.

[0026] Depend on Figure 1 As shown, the switch described in the utility model takes a two-pole circuit breaker as an example in this embodiment, but is not limited by the switch type and the number of switch poles shown in the figure. Each pole has an arc extinguishing device, and two poles have two arc extinguishing devices with exactly the same structure, and each has the three exhaust passages 2 mentioned above. The arrangement direction of the two poles of the circuit breaker is as follows: Figure 1 The arrangement direction from left to right or from right to left in the position state shown is the width direction of the circuit breaker, which is also the width direction of the arc-extinguishing grid 1 mentioned above.

[0027] In this embodiment, if Figure 2The exhaust channel penetrates all arc-extinguishing grids 1, and a notch 11 is formed on the end of the arc-extinguishing grid 1 facing the outlet of the arc-extinguishing device. The number of the notches 11 is not less than three, that is, not less than three, specifically three or more, such as four, etc. The spacing distances between the notches 11 on the same arc-extinguishing grid 1 are equal, such as Figure 3 . After the arc extinguishing device is installed in the arc extinguishing device accommodating chamber 30, the end of the arc extinguishing grid 1 away from the contact system, that is, the end of the arc extinguishing grid facing the outlet of the arc extinguishing device, abuts against the bottom wall of the arc extinguishing device accommodating chamber 30. When the arc extinguishing grids 1 adjacent to each other are stacked, their notches 11 overlap, thereby forming the aforementioned exhaust passage. An exhaust port is usually opened on the side wall of the arc extinguishing device accommodating chamber 30, and the exhaust port is connected to the exhaust channel, so that the exhaust channel is connected to the outside of the circuit breaker. The gas flows in the exhaust channel toward the exhaust port along the arrangement direction of the arc extinguishing grids 1.

[0028] Of course, the present invention is not limited to the three exhaust paths formed by stacking three notches 11 on the arc-extinguishing grid 1 in the present embodiment. The notches 11 may be arranged more densely, thereby increasing the number of exhaust paths 2 .

[0029] In order to better utilize the narrow gap effect and ensure the smooth exhaust at the same time, preferably, relative to a single arc-extinguishing grid, the sum of the widths of all the exhaust passages 2 separated by it in the width direction of the arc-extinguishing grid 1 is between one-third and two-thirds of the width of the arc-extinguishing grid. In this embodiment, the cross-sectional shape of the exhaust passage 2 is rectangular. Of course, the cross-sectional shape of the exhaust passage 2 is not limited to a rectangle, and can be a semicircle, a trapezoid or a triangle. Preferably, the maximum width of the exhaust passage 2 in the width direction of the arc-extinguishing grid 1 is 2 mm to 6 mm, which is compatible with switches of different frame current levels.

[0030] When the circuit breaker is breaking a large current, the moving contact 4 and the moving and static contact of the static contact are separated to form an arc. Under the action of air blowing or magnetic blowing force, the arc enters from the entrance of the arc extinguishing device and is divided by the arc extinguishing grid 1. Then, the high-temperature gas with metal particles is discharged out of the circuit breaker through the exhaust channel at the rear of the arc extinguishing grid stack (the side of the arc extinguishing grid 1 away from the contact system), that is, at the outlet of the arc extinguishing device. The exhaust channel is composed of a plurality of mutually separated exhaust passages 2 parallel to the width direction of the arc extinguishing grid (which can be understood as the direction perpendicular to the arrangement direction of the entrance and outlet of the arc extinguishing device), that is, the gas outflow channel is divided into a plurality of mutually separated parallel passages, and the total cross-sectional area of ​​the gas flow channel is adjusted to ensure smooth exhaust of the circuit breaker. Since the gas outflow channel is divided into a plurality of mutually separated parallel exhaust passages, when the high-temperature gas containing metal particles forms an arc in the channel, the arc voltage is increased due to the squeezing effect of the narrow slit channel, and finally extinguished.

[0031] In addition, it should be noted that the arc extinguishing grids 1 in the arc extinguishing device are not limited to being arranged in one direction as described in the above embodiments. The arc extinguishing device may also include not only a first grid group arranged at intervals along the left-right direction, but also a second grid group arranged at intervals along the up-down direction, that is, the arc extinguishing device is in a "┙" shape, and a notch 11 is provided on the end of each arc extinguishing grid 1 of the second grid group away from the contact system. After the arc extinguishing grids of the second grid group are stacked, the notches overlap in the arrangement direction of the arc extinguishing grids to form an exhaust channel. Therefore, the exhaust channel includes an exhaust channel that is through in the left-right direction formed at the end of the first grid group away from the contact system, and also includes an exhaust channel that is through in the up-down direction formed at the end of the second grid group away from the contact system, so that the exhaust channel is in a "┙" shape.

[0032] Please continue to see Figure 2 In the above-mentioned embodiment, among the arc-extinguishing grids 1 arranged at intervals, the number of notches 11 on each arc-extinguishing grid 1 penetrated by the exhaust passage is equal, and the spacing distances between the notches 11 on each arc-extinguishing grid 1 are equal. The notches 11 are aligned in the arrangement direction of each two adjacent arc-extinguishing grids 1, so that the exhaust passage 2 is a long straight shape extending along the arrangement direction of the arc-extinguishing grids 1. The multiple exhaust passages 2 are not only parallel in the width direction of the arc-extinguishing grids 1, but also parallel to each other, and the cross-sections are all the same rectangular shape, and the spacing distances between them are equal. However, it should be understood that the structure of the exhaust passage of the utility model is not limited to the above-mentioned embodiment. For details, please refer to Figure 4 and Figure 5 , the slots 11 on each of the two adjacent arc-extinguishing grids 1 are offset to form an oblique line (such as Figure 4 ) or curve status (such as Figure 5 When the number of notches 11 on two adjacent arc-extinguishing grids is not equal, or the spacing between the notches is not equal, the notches on two adjacent arc-extinguishing grids 1 will also be misaligned, and a folded exhaust path 2 will also be formed.

[0033] In the above preferred embodiment, a structure is provided in which the exhaust channel penetrates all arc-extinguishing grids 1 and at least three notches 11 are formed on each arc-extinguishing grid 1. The utility model can also have the following variations:

[0034] The exhaust channel penetrates all the arc-extinguishing grids 1 as in the above embodiment, but is different from the above embodiment in that only one arc-extinguishing grid or several of the arc-extinguishing grids are penetrated by the exhaust channel to form a number of notches greater than or equal to three, while the number of notches formed by the exhaust channel on the other arc-extinguishing grids is one or two, as shown in FIG. Figure 6Therefore, on some arc-extinguishing grids, the exhaust channel is divided into three or more exhaust channels 2, and on some arc-extinguishing grids, the exhaust channel is not divided, that is, on the arc-extinguishing grid, the exhaust channels 2 are merged, and the entire exhaust channel is connected in the arrangement direction of the arc-extinguishing grids through the same notch 11.

[0035] Of course, the exhaust channel may not penetrate all the arc-extinguishing grids 1. For example, when the arc-extinguishing device is installed in the base, the ends of several arc-extinguishing grids away from the contact system are facing the exhaust port on the base. In this case, the exhaust channel does not need to penetrate these arc-extinguishing grids, but only needs to penetrate the arc-extinguishing grids that are not in position corresponding to the exhaust port, and can also penetrate in the arrangement direction of the arc-extinguishing grids. For the arc-extinguishing grids penetrated by the exhaust channel, the notches formed by the penetration thereon can be aligned, staggered, equal or unequal in spacing, equal or unequal in number as described in the above embodiments, as long as it can meet the requirements that in the entire channel for gas discharge, the notches 11 on the arc-extinguishing grid 1 divide the exhaust channel to form a plurality of parallel narrow slit channels separated from each other in the width direction of the arc-extinguishing grid 1. The utility model is intended to form a plurality of parallel channels separated from each other, which together form a gas discharge channel for the supply gas to discharge the arc-extinguishing device in the arrangement direction of the arc-extinguishing grids 1.

[0036] In the above-listed implementations, the exhaust channel penetrates the arc-extinguishing grid 1 to form a notch 11 on the end of the arc-extinguishing grid 1 facing the outlet of the arc-extinguishing device. For a single arc-extinguishing grid 1, the number of the notches 11 thereon is not less than three. When the arc-extinguishing grids are arranged at intervals from each other, the notches 11 on each adjacent arc-extinguishing grid are stacked on each other to form an exhaust channel.

[0037] See also Figure 7 In another embodiment of the utility model, in addition to the exhaust passage 2 formed by the notch 11, the arc-extinguishing grid 1 has notches 12 on both sides or one side of the end facing the arc-extinguishing device outlet. After several arc-extinguishing grids are arranged at intervals, the corresponding notches 12 on each adjacent arc-extinguishing grid are stacked to form an exhaust passage. For a single arc-extinguishing grid 1, the sum of the notches 11 and the notches 12 thereon is not less than three. Figure 7 It is disclosed that the notches 12 are formed on both sides of the end of the arc extinguishing grid facing the outlet of the arc extinguishing device. Of course, the notch 12 may be formed only on one side of the end of the arc extinguishing grid facing the outlet of the arc extinguishing device. No matter whether the exhaust passage 2 is formed by stacking the notches 12 on a plurality of arc extinguishing grids arranged at intervals, or the exhaust passage 2 is formed by stacking the notches 11 on the plurality of arc extinguishing grids, the sum of the widths of the exhaust passage 2 in the width direction of the arc extinguishing grid 1 is between one third and two thirds of the width of the arc extinguishing grid.

[0038] In addition, the above-mentioned embodiments show the application of the arc extinguishing device of the utility model inside the circuit breaker. However, the application of the arc extinguishing device of the utility model is not limited to the circuit breaker, and can be a switching switch, a disconnector, etc., as long as it is a switching electrical appliance with a contact system and an arc extinguishing device inside.

Claims

1. An arc extinguishing device for a switch, comprising a plurality of arc extinguishing grids (1) arranged in an interval arrangement, characterized in that: An exhaust passage is provided at the outlet of the arc extinguishing device, which passes through in the arrangement direction of the plurality of arc extinguishing grids (1). The exhaust passage penetrates at least one of the plurality of arc extinguishing grids (1). Among the penetrated arc extinguishing grids, at least one arc extinguishing grid divides the exhaust passage into at least three exhaust passages (2) parallel to each other in the width direction of the arc extinguishing grids.

2. The arc extinguishing device of a switch according to claim 1, characterized in that: Relative to a single arc-extinguishing grid, the sum of the widths of all exhaust passages (2) divided by the arc-extinguishing grid in the width direction of the arc-extinguishing grid (1) is between one third and two thirds of the width of the arc-extinguishing grid.

3. The arc extinguishing device of a switch according to claim 1, characterized in that: The cross-sectional shape of the exhaust passage (2) is rectangular, semicircular, trapezoidal or triangular.

4. The arc extinguishing device of a switch according to claim 1, characterized in that: The maximum width of the exhaust passage (2) in the width direction of the arc-extinguishing grid (1) is 2 mm to 6 mm.

5. The arc extinguishing device of a switch according to claim 1, characterized in that: The switch comprises a base (3), the base (3) forming an arc extinguishing device accommodating chamber (30), the arc extinguishing device being accommodated in the arc extinguishing device accommodating chamber (30), and the end of the arc extinguishing grid (1) facing the outlet of the arc extinguishing device abutting against the chamber wall of the arc extinguishing device accommodating chamber (30).

6. The arc extinguishing device of a switch according to claim 1, characterized in that: The exhaust passage penetrates the arc extinguishing grid (1) to form a notch (11) on the end of the arc extinguishing grid (1) facing the outlet of the arc extinguishing device. For a single arc extinguishing grid (1), the number of the notches (11) thereon is not less than three. When the arc extinguishing grids are arranged in an interval, the notches (11) on adjacent arc extinguishing grids are stacked to form an exhaust passage.

7. The arc extinguishing device of a switch according to claim 6, characterized in that: The exhaust passage penetrates the arc extinguishing grid (1) to form notches (12) on both sides or one side of an end of the arc extinguishing grid (1) facing the outlet of the arc extinguishing device. For a single arc extinguishing grid (1), the sum of the number of the notches (11) and the notches (12) thereon is not less than three. When the arc extinguishing grids are arranged in an interval, the corresponding notches (11) on each adjacent arc extinguishing grid are stacked to form an exhaust passage, and the corresponding notches (12) on each adjacent arc extinguishing grid are stacked to form an exhaust passage.

8. An arc extinguishing device for a switch according to claim 6 or 7, characterized in that: The exhaust channel penetrates at least two of the arc-extinguishing grids (1) that are arranged continuously.

9. The arc extinguishing device of a switch according to claim 8, characterized in that: The number of notches (11) on each arc-extinguishing grid piece (1) penetrated by the exhaust channel is equal, and they are aligned or offset in the arrangement direction of the arc-extinguishing grid pieces (1).

10. The arc extinguishing device of a switch according to claim 8, characterized in that: The number of notches (11) on each arc-extinguishing grid piece (1) penetrated by the exhaust channel is different, and the notches (11) are staggered in the arrangement direction of the arc-extinguishing grid pieces (1).

Images