An arc extinguishing device for extinguishing an arc in an electric switch and an electric switch

Abstract

The utility model discloses an arc extinguishing device for extinguishing arc in the switch of electricity, and the switch of electricity includes the casing, contact support, movable contact, static contact, arc extinguishing device, and the arc extinguishing device includes the upper arc extinguishing grid group that is composed of the grid piece of multiple vertical extension arrangement, the middle arc extinguishing grid group that is composed of the grid piece of multiple horizontal extension arrangement, the lower arc extinguashing grid group that is composed of the grid piece of multiple vertical extension arrangement, the left part of upper arc extinguishing grid group is connected with the upper part of middle arc extinguishing grid group, and the lower part of middle arc extinguishing grid group is connected with the upper part of lower arc extinguishing grid group, the utility model discloses the layout of arc extinguishing chamber is changed to arrange more arc extinguishing grid piece under the same volume, avoid the arc not to pass through the grid piece of three grid piece groups adjacent place, directly jump into the second group grid piece assembly, lead to the grid piece not to be fully utilized to the longer arc that will draw, and the arc is extinguished quickly, and arc extinguishing performance is improved.

Description

Technical Field

[0001] This invention relates to the field of low-voltage electrical technology, specifically to an arc-extinguishing device for extinguishing electric arcs in an electrical switch and an electrical switch. Background Technology

[0002] With the increasing power of photovoltaic new energy equipment, the performance requirements for switches are becoming higher and higher, especially the voltage level. The system has reached 1200V or more, and even 2500V or more under some operating conditions. How to extinguish the arc generated by the switch when interrupting high voltage and high current is an important indicator that restricts the performance of the switch.

[0003] Arc extinguishing devices are used to elongate, break, and extinguish the electric arc generated when the contacts are disconnected during a short-circuit fault in a switch. To achieve the high voltage and high current breaking capacity of the switch, methods such as increasing the number of arc extinguishing chamber grids, increasing the contact gap, and connecting multiple breakpoints in series are commonly used. Although these methods can improve the breaking capacity of the switch, they will make the switch larger and more expensive.

[0004] The existing patent CN118173400A provides an arc-extinguishing structure that improves space utilization by changing the layout of the arc-extinguishing chamber grids and arranging more arc-extinguishing grids in a limited space. However, it carries the risk of low grid utilization and relatively poor arc-extinguishing effect.

[0005] The applicant disclosed an arc-extinguishing device in its prior patent CN219105960U for extinguishing electric arcs in an electrical switch. The arc-extinguishing device includes at least an arc-extinguishing grid assembly, a moving contact, a stationary contact, and an insulating shell. The moving and stationary contacts generate an initial arc column when they first separate. Multiple metal arc-extinguishing grids in the arc-extinguishing grid assembly are stacked and arranged in at least one bent structure, and these grids are arranged directly or indirectly along at least two adjacent inner sides of the insulating shell. The stationary contact is... At least one bent structure is provided at the first end of the arc-extinguishing grid assembly. The first metal arc-extinguishing grid is located close to or adjacent to a bent conductor on the stationary contact and also close to or adjacent to the initial arc column. The first metal arc-extinguishing grid and the bent conductor extend in the same direction or at an angle. This achieves a double-layer DC2550V / 60A, 2700V / 40A, and 3000V / 20A breaking capacity at an altitude of 4000 meters. However, due to the limitation of the arc-extinguishing grid arrangement, the breaking capacity has reached its limit.

[0006] Therefore, a new technical solution is urgently needed to improve arc extinguishing performance, reduce switch size, and lower switch cost. Summary of the Invention

[0007] Based on the above background, this utility model provides an arc-extinguishing device for extinguishing electric arcs in an electric switch. The electric switch includes a housing, a contact support, a moving contact, a stationary contact, and an arc-extinguishing device. The arc-extinguishing device includes an upper arc-extinguishing grid group composed of multiple vertically extending grids, a middle arc-extinguishing grid group composed of multiple horizontally extending grids, and a lower arc-extinguishing grid group composed of multiple vertically extending grids. The left part of the upper arc-extinguishing grid group is connected to the upper part of the middle arc-extinguishing grid group, and the lower part of the middle arc-extinguishing grid group is connected to the upper part of the lower arc-extinguishing grid group. This utility model, by changing the layout of the arc-extinguishing chamber, achieves the arrangement of more arc-extinguishing grids in the same volume, avoiding the arc from jumping directly to the second grid assembly without passing through the grids adjacent to the three grid groups, thus preventing the grids from being underutilized. This allows the arc to be stretched longer, extinguishing the arc quickly and improving the arc-extinguishing performance.

[0008] The technical solution of this utility model is as follows:

[0009] An arc-extinguishing device for extinguishing an electric arc in an electrical switch, the electrical switch comprising a housing (400), a contact support (500), a moving contact (300), a stationary contact (100), and an arc-extinguishing device (200), characterized in that: the arc-extinguishing device (200) comprises: a first group of upper arc-extinguishing grid plates (210) composed of multiple vertically extending arc-extinguishing grid plates; a second group of middle arc-extinguishing grid plates (220) composed of multiple horizontally extending arc-extinguishing grid plates; and a third group of lower arc-extinguishing grid plates (230) composed of multiple vertically extending arc-extinguishing grid plates; the upper arc-extinguishing grid plate group (210) The left first arc-extinguishing grid plate (211) is connected to the upper first arc-extinguishing grid plate (221) of the middle arc-extinguishing grid plate group (220), and the lower first arc-extinguishing grid plate (222) of the middle arc-extinguishing grid plate group (220) is connected to the left first arc-extinguishing grid plate (232) of the lower arc-extinguishing grid plate group (230). The vertically extending arc-extinguishing grid plates of the upper arc-extinguishing grid plate group (210) and the lower arc-extinguishing grid plate group (230) extend along the Y-axis or at a certain angle to the Y-axis. The horizontally extending arc-extinguishing grid plates of the middle arc-extinguishing grid plate group (220) extend along the X-axis or at a certain angle to the X-axis.

[0010] The line connecting the lower end of the upper arc-extinguishing grid plate group (210) and the line connecting the right end of the middle arc-extinguishing grid plate group (220) form a sharp angle α1, the vertex of the sharp angle α1 is recessed away from the moving contact, and the line connecting the right end of the middle arc-extinguishing grid plate group (220) and the line connecting the upper end of the lower arc-extinguishing grid plate group (230) form a sharp angle α2, the vertex of the sharp angle α2 is recessed away from the moving contact;

[0011] The right end of the middle arc-extinguishing grid plate group (220) is connected to form a connecting line L. The extension line of one end of the connecting line L intersects the arc-extinguishing grid plate on the left side of the upper arc-extinguishing grid plate group (210), and the extension line of the other end intersects the arc-extinguishing grid plate on the left side of the lower arc-extinguishing grid plate group (230).

[0012] The width of the upper end of the upper arc-extinguishing grid plate group (210) is greater than the width of the lower end. The upper end of the arc-extinguishing grid plate on the left side of the middle of the upper arc-extinguishing grid plate group (210) is tilted to the left. The tilt angle of the arc-extinguishing grid plate gradually decreases from left to right. The first arc-extinguishing grid plate (211) on the left side of the upper arc-extinguishing grid plate group (210) forms an acute angle β1 with the Y-axis. The arc-extinguishing grid plate in the middle of the upper arc-extinguishing grid plate group (210) extends along the Y-axis. The upper end of the arc-extinguishing grid plate on the right side of the middle of the upper arc-extinguishing grid plate group (210) is tilted to the right. The tilt angle of the arc-extinguishing grid plate gradually decreases from right to left. The first arc-extinguishing grid plate (212) on the right side of the upper arc-extinguishing grid plate group (210) forms an acute angle β2 with the Y-axis. The spacing between the arc-extinguishing grid plates in the upper arc-extinguishing grid plate group (210) gradually decreases from top to bottom.

[0013] Furthermore, the width of the left end of the central arc-extinguishing grid plate group (220) is greater than the width of the right end. The right end of the upper middle arc-extinguishing grid plate of the central arc-extinguishing grid plate group (220) is inclined downward, and the inclination angle of the arc-extinguishing grid plate gradually decreases from top to bottom. The upper first arc-extinguishing grid plate (221) of the central arc-extinguishing grid plate group (220) forms an acute angle β3 with the X-axis. The middle arc-extinguishing grid plate of the central arc-extinguishing grid plate group (220) is arranged along the X-axis direction. The right end of the lower middle arc-extinguishing grid plate of the central arc-extinguishing grid plate group (220) is inclined upward, and the inclination angle of the arc-extinguishing grid plate gradually decreases from bottom to top. The lower first arc-extinguishing grid plate (222) of the central arc-extinguishing grid plate group (220) forms an acute angle β4 with the X-axis. The spacing between each arc-extinguishing grid plate of the central arc-extinguishing grid plate group (220) gradually decreases from left to right.

[0014] Furthermore, the width of the lower end of the lower arc-extinguishing grid plate group (230) is greater than the width of the upper end. The lower end of the arc-extinguishing grid plate of the lower arc-extinguishing grid plate group (230) is inclined to the right. The inclination angle of the arc-extinguishing grid plate gradually decreases from left to right. The first arc-extinguishing grid plate (232) on the left of the lower arc-extinguishing grid plate group (230) forms an acute angle β5 with the Y-axis. The spacing between each arc-extinguishing grid plate of the lower arc-extinguishing grid plate group (230) gradually decreases from bottom to top.

[0015] Furthermore, the preferred range for α1 and α2 is 15 degrees to 60 degrees.

[0016] Furthermore, the acute angles β1, β2, β3, β4, and β5 are preferably in the range of 5 degrees to 85 degrees.

[0017] Furthermore, the first arc-extinguishing grid plate (212) on the right side of the upper arc-extinguishing grid plate group (210) comes into contact with the stationary contact (100).

[0018] Furthermore, the middle part of the arc-extinguishing grid plate of the middle arc-extinguishing grid plate group (220) moves closer to the direction of the moving contact (300).

[0019] Furthermore, an arc-inducing element (231) extending toward the moving contact is provided at the top of the lower arc-extinguishing grid assembly (230).

[0020] Furthermore, the arc-extinguishing device (200) includes at least two sheet-like insulating plates for fixing the arc-extinguishing grid plates.

[0021] Furthermore, the arc extinguishing device (200) is provided with an insulating arc-isolating component (240), which includes an upper arc-isolating plate (241) and a lower arc-isolating plate (242), with the upper arc-isolating plate (241) and the lower arc-isolating plate (242) separated by a certain distance h.

[0022] Furthermore, the contact support (500) includes an upper contact support (510) and a lower contact support (520), and the distance h between the upper arc-blocking plate (241) and the lower arc-blocking plate (242) is greater than or equal to the groove distance h1 formed by the combination of the upper contact support (510) and the lower contact support (520).

[0023] Furthermore, the moving contact tip is provided with a pointed corner (310) for arc initiation.

[0024] An electrical switch, characterized in that it comprises a housing (400), a contact support (500), a moving contact (300), a stationary contact (100), and an arc-extinguishing device (200); the arc-extinguishing device (200) comprises: a first group of upper arc-extinguishing grid plates (210) composed of multiple vertically extending arc-extinguishing grid plates, a second group of middle arc-extinguishing grid plates (220) composed of multiple horizontally extending arc-extinguishing grid plates, and a third group of lower arc-extinguishing grid plates (230) composed of multiple vertically extending arc-extinguishing grid plates; the left first arc-extinguishing grid plate (211) of the upper arc-extinguishing grid plate group (210) and the upper first arc-extinguishing grid plate (220) of the middle arc-extinguishing grid plate group (220) are connected to each other. The arc-extinguishing grid plates (221) are connected. The first lower arc-extinguishing grid plate (222) of the middle arc-extinguishing grid plate group (220) is connected to the first left arc-extinguishing grid plate (232) of the lower arc-extinguishing grid plate group (230). The vertically extending arc-extinguishing grid plates of the upper arc-extinguishing grid plate group (210) and the lower arc-extinguishing grid plate group (230) extend along the Y-axis or at a certain angle to the Y-axis. The horizontally extending arc-extinguishing grid plates of the middle arc-extinguishing grid plate group (220) extend along the X-axis or at a certain angle to the X-axis. The line connecting the lower end of the upper arc-extinguishing grid plate group (210) and the line connecting the right end of the middle arc-extinguishing grid plate group (220) form a sharp angle α1. The vertex of α1 is recessed away from the moving contact. The line connecting the right end of the middle arc-extinguishing grid plate group (220) and the line connecting the upper end of the lower arc-extinguishing grid plate group (230) form a sharp angle α2. The vertex of the sharp angle α2 is recessed away from the moving contact. The right ends of the middle arc-extinguishing grid plate group (220) are connected to form a connecting line L. The extension line of one end of the connecting line L intersects the arc-extinguishing grid plate on the left side of the upper arc-extinguishing grid plate group (210), and the extension line of the other end intersects the arc-extinguishing grid plate on the left side of the lower arc-extinguishing grid plate group (230). The width of the upper end of the upper arc-extinguishing grid plate group (210) is greater than the width of the lower end. The upper arc-extinguishing grid plate group (210) is recessed away from the moving contact. The upper end of the arc-extinguishing grid plate on the left side of the upper arc-extinguishing grid plate group (210) is tilted to the left, and the tilt angle of the arc-extinguishing grid plate gradually decreases from left to right. The first arc-extinguishing grid plate (211) on the left side of the upper arc-extinguishing grid plate group (210) forms an acute angle β1 with the Y-axis. The middle arc-extinguishing grid plate of the upper arc-extinguishing grid plate group (210) extends along the Y-axis. The upper end of the right side of the middle arc-extinguishing grid plate of the upper arc-extinguishing grid plate group (210) is tilted to the right, and the tilt angle of the arc-extinguishing grid plate gradually decreases from right to left. The first arc-extinguishing grid plate (212) on the right side of the upper arc-extinguishing grid plate group (210) forms an acute angle β2 with the Y-axis. The spacing between the arc-extinguishing grid plates of the upper arc-extinguishing grid plate group (210) gradually decreases from top to bottom.

[0025] Furthermore, the width of the left end of the central arc-extinguishing grid plate group (220) is greater than the width of the right end. The right end of the upper middle arc-extinguishing grid plate of the central arc-extinguishing grid plate group (220) is inclined downward, and the inclination angle of the arc-extinguishing grid plate gradually decreases from top to bottom. The upper first arc-extinguishing grid plate (221) of the central arc-extinguishing grid plate group (220) forms an acute angle β3 with the X-axis. The middle arc-extinguishing grid plate of the central arc-extinguishing grid plate group (220) is arranged along the X-axis direction. The right end of the lower middle arc-extinguishing grid plate of the central arc-extinguishing grid plate group (220) is inclined upward, and the inclination angle of the arc-extinguishing grid plate gradually decreases from bottom to top. The lower first arc-extinguishing grid plate (222) of the central arc-extinguishing grid plate group (220) forms an acute angle β4 with the X-axis. The spacing between each arc-extinguishing grid plate of the central arc-extinguishing grid plate group (220) gradually decreases from left to right.

[0026] Furthermore, the width of the lower end of the lower arc-extinguishing grid plate group (230) is greater than the width of the upper end. The lower end of the arc-extinguishing grid plate of the lower arc-extinguishing grid plate group (230) is inclined to the right. The inclination angle of the arc-extinguishing grid plate gradually decreases from left to right. The first arc-extinguishing grid plate (232) on the left of the lower arc-extinguishing grid plate group (230) forms an acute angle β5 with the Y-axis. The spacing between each arc-extinguishing grid plate of the lower arc-extinguishing grid plate group (230) gradually decreases from bottom to top.

[0027] Furthermore, the preferred range for α1 and α2 is 15 degrees to 60 degrees.

[0028] Furthermore, the acute angles β1, β2, β3, β4, and β5 are preferably in the range of 5 degrees to 85 degrees.

[0029] Furthermore, the first arc-extinguishing grid plate (212) on the right side of the upper arc-extinguishing grid plate group (210) comes into contact with the stationary contact (100).

[0030] Furthermore, the middle part of the arc-extinguishing grid plate of the middle arc-extinguishing grid plate group (220) moves closer to the direction of the moving contact (300).

[0031] Furthermore, an arc-inducing element (231) extending toward the moving contact is provided at the top of the lower arc-extinguishing grid assembly (230).

[0032] Furthermore, there are two arc-extinguishing devices (200), which are respectively disposed on both sides of the contact support (500).

[0033] The beneficial effects of this invention are as follows:

[0034] 1. By changing the arrangement of the arc-extinguishing grids in the arc-extinguishing device, the space utilization rate is improved, the number of arc-extinguishing grids is increased, and the situation where the arc jumps directly to the second grid assembly without passing through the grids adjacent to the three grid groups, resulting in the grids not being fully utilized, is avoided. This allows the arc to be stretched longer, the arc to be extinguished quickly, and the arc-extinguishing performance to be improved.

[0035] 2. Only the layout of the arc-extinguishing grid in the arc-extinguishing device was changed. The size of the switch was not increased, nor was the cost significantly increased. The switch was optimized based on the original switch, which improved the breaking performance and market competitiveness of the switch.

[0036] 3. By conducting short-circuit breaking tests on two-layer series DC3000V / 60A photovoltaic systems in an environment at an altitude of 4000 meters, the number of breaking cycles reached more than 5, with a breaking time of less than 15ms, demonstrating significant effectiveness. Attached Figure Description

[0037] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0038] Figure 1 This is a schematic diagram of the structure of an electric switch according to a specific embodiment of the present invention;

[0039] Figure 2 This is a schematic diagram of the arc-extinguishing device according to a specific embodiment of the present invention;

[0040] Figure 3 for Figure 2 Schematic diagram of the exploded structure of the arc-extinguishing device;

[0041] Figure 4 This is a side view of an electric switch according to a specific embodiment of the present invention;

[0042] Figure 5 This is a schematic diagram of the contact system according to a specific embodiment of the present utility model. Detailed Implementation

[0043] The features and exemplary embodiments of various aspects of this utility model will now be described in detail. In the following detailed description, numerous specific details are set forth in order to provide a comprehensive understanding of the invention. However, it will be apparent to those skilled in the art that the invention can be practiced without requiring some of these specific details. The following description of embodiments is merely intended to provide a better understanding of the invention by illustrating examples of the invention. The invention is by no means limited to any specific configuration and algorithm presented below, but covers any modifications, substitutions, and improvements to elements, components, and algorithms without departing from the spirit of the invention. In the accompanying drawings and the following description, well-known structures and techniques are not shown in order to avoid unnecessarily obscuring the invention.

[0044] In the description of this utility model, it should be noted that the terms "center," "upper," "lower," "left," "right," "front," "rear," "vertical," "horizontal," "inner," and "outer," indicating orientation or positional relationships, are only for the convenience of describing the invention and simplifying the description, and do not simply 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 invention.

[0045] Furthermore, terms such as "horizontal" and "vertical" do not imply that components must be absolutely horizontal or suspended, but rather that they can be slightly tilted. For example, "horizontal" simply means that its direction is more horizontal than "vertical," and does not imply that the structure must be completely horizontal, but can be slightly tilted.

[0046] Please refer to Figure 1 This embodiment discloses an electrical switch, including a housing 400, a contact support 500, a moving contact 300, a stationary contact 100, and an arc-extinguishing device 200. The moving contact 300, the contact support 500, and the arc-extinguishing device 200 are located in a cavity inside the housing 400. The four corners of the cavity are right angles or similar right angles with arcs. There are two arc-extinguishing devices 200, distributed on both sides of the contact support 500. The arc-extinguishing grid of the arc-extinguishing device 200 is arranged along the inner sidewall of the cavity. The stationary contact 100 is partially disposed inside the housing 400 and partially extends out of the housing 400. The moving contact 300 contacts or disconnects from the stationary contact 100 to realize the connection or disconnection of the electrical switch.

[0047] It should be noted that the directional terms "up," "down," "left," and "right" described in this utility model are based on Figure 1 The indicated direction.

[0048] Specifically, the arc-extinguishing device includes: a first group of upper arc-extinguishing grid plates 210 composed of multiple vertically extending grid plates; a second group of middle arc-extinguishing grid plates 220 composed of multiple horizontally extending grid plates; and a third group of lower arc-extinguishing grid plates 230 composed of multiple vertically extending grid plates. The left first arc-extinguishing grid plate 211 of the upper arc-extinguishing grid plate group 210 is connected to the upper first arc-extinguishing grid plate 221 of the middle arc-extinguishing grid plate group 220, and the lower first arc-extinguishing grid plate 222 of the middle arc-extinguishing grid plate group 220 is connected to the left first arc-extinguishing grid plate 232 of the lower arc-extinguishing grid plate group 230. The vertically extending arc-extinguishing grid plates of the upper arc-extinguishing grid plate group 210 and the lower arc-extinguishing grid plate group 230 extend along the Y-axis or at a certain angle to the Y-axis. In this way, more arc-extinguishing grids can be arranged in a switch of the same size, and the grids can be fully utilized. After the arc enters the arc-extinguishing device, it is quickly elongated and broken, and the arc is extinguished in a very short time, which greatly improves the arc-extinguishing performance of the arc-extinguishing device.

[0049] In this embodiment, the rightmost arc-extinguishing grid plate in the middle of the upper arc-extinguishing grid plate group 210 tilts to the right, forming an acute angle with the Y-axis; the middle arc-extinguishing grid plate in the upper arc-extinguishing grid plate group 210 extends along the Y-axis; the leftmost arc-extinguishing grid plate in the middle of the upper arc-extinguishing grid plate group 210 tilts to the left, forming an acute angle with the Y-axis. This arrangement ensures that the width of the upper end of the upper arc-extinguishing grid plate group 210 is greater than the width of the lower end, meaning the spacing between the arc-extinguishing grid plates in the upper arc-extinguishing grid plate group 210 gradually decreases from top to bottom. This gradual decrease in spacing between the arc-extinguishing grid plates in the upper arc-extinguishing grid plate group 210 causes the arc to gradually lengthen and thin as it enters the upper arc-extinguishing grid plate group 210, accelerating the arc extinguishing speed.

[0050] In this embodiment, the width of the lower end of the lower arc-extinguishing grid assembly 230 is greater than the width of the upper end. The arc-extinguishing grids of the lower arc-extinguishing grid assembly 230 are tilted to the right at an acute angle to the Y-axis, and the tilt angle of the arc-extinguishing grids gradually decreases from left to right. The spacing between the arc-extinguishing grids of the lower arc-extinguishing grid assembly 230 gradually decreases from bottom to top. The laterally extending arc-extinguishing grids extend along the X-axis or at a certain angle to the X-axis. The gradually decreasing spacing between the arc-extinguishing grids of the lower arc-extinguishing grid assembly 230 causes the arc to gradually lengthen and thin as it enters the lower arc-extinguishing grid assembly 230, thus accelerating the extinguishing speed of the arc.

[0051] In this embodiment, the width of the left end of the central arc-extinguishing grid assembly 220 is greater than the width of the right end. The right end of the upper middle arc-extinguishing grid in the central arc-extinguishing grid assembly 220 is inclined downward, forming an acute angle with the X-axis. The middle arc-extinguishing grid in the central arc-extinguishing grid assembly 220 is arranged along the X-axis. The right end of the lower middle arc-extinguishing grid in the central arc-extinguishing grid assembly 220 is inclined upward, forming an acute angle with the X-axis. The spacing between the arc-extinguishing grids in the central arc-extinguishing grid assembly 220 gradually decreases from left to right. The middle portion of the arc-extinguishing grids in the central arc-extinguishing grid assembly 220 moves closer to the moving contact 300, making it easier for the arc to enter the arc-extinguishing chamber. The gradually decreasing spacing between the arc-extinguishing grids in the central arc-extinguishing grid assembly 220 causes the arc to gradually lengthen and thin as it enters the central arc-extinguishing grid assembly 220, accelerating the arc extinguishing speed.

[0052] Please continue to refer to this. Figure 1 The line connecting the lower end of the upper arc-extinguishing grid plate group 210 and the line connecting the right end of the middle arc-extinguishing grid plate group 220 forms an acute angle α1, and the grid plates at the sharp corner are recessed away from the moving contact. That is, the arc-extinguishing grid plates adjacent to the upper arc-extinguishing grid plate group 210 and the middle arc-extinguishing grid plate group 220 are arranged at the corner of the housing 400. The 2-3 arc-extinguishing grid plates on the left side of the upper arc-extinguishing grid plate group 210 are distributed at the corner of the housing, and their tilt angle is larger than that of the arc-extinguishing grid plates on the right side, and they are further away from the moving contact. The arc-extinguishing grids in the upper arc-extinguishing grid group 210 are recessed in the direction of inclination, so that the line connecting the lower end of the upper arc-extinguishing grid group 210 is composed of two segments from right to left. The line connecting the right segment is roughly a straight line along the X-axis, and the line connecting the left segment is a straight line bent upwards. The arc-extinguishing grids in the middle arc-extinguishing grid group 220 located at the corners of the housing have a large inclination angle and are recessed away from the moving contact, so that the right end of these arc-extinguishing grids forms a straight line inclined to the left. This straight line forms an acute angle α1 with the straight line of the left segment of the lower end of the upper arc-extinguishing grid group 210. Similarly, the line connecting the right end of the middle arc-extinguishing grid group 220 forms an acute angle α2 with the line connecting the upper end of the lower arc-extinguishing grid group 230, and the grids at the sharp corners are recessed away from the moving contact. The range of α1 and α2 is 15 degrees to 60 degrees.

[0053] Please continue to refer to this. Figure 1 In this embodiment, the ends of the middle arc-extinguishing grid plate group near the moving contact are connected to form a connecting line L. The extension line of one end of the connecting line L intersects the arc-extinguishing grid plate on the left side of the upper arc-extinguishing grid plate group, and the extension line of the other end intersects the arc-extinguishing grid plate on the left side of the lower arc-extinguishing grid plate group.

[0054] refer to Figure 1In this embodiment, the rightmost arc-extinguishing grid plate of the lower arc-extinguishing grid plate group 230 is set as an arc-initiating plate 231. The arc-initiating plate 231 is closest to the moving contact. Setting an arc-initiating element can realize the rapid switching of the arc, so that the arc can be quickly elongated and enter the arc-extinguishing chamber more quickly, increasing the arc voltage and accelerating the extinguishing of the arc. The first arc-extinguishing grid plate 212 on the right side of the upper arc-extinguishing grid plate group 210 is in contact with the stationary contact 100.

[0055] refer to Figure 2 , Figure 3 , Figure 4 The arc-extinguishing device 200 of this utility model also includes an arc-isolating plate 250 and an arc-isolating plate 260, which serve to fix the arc-extinguishing grid plates and maintain the structure of the arc-extinguishing chamber. The upper arc-extinguishing grid plate group 210, the middle arc-extinguishing grid plate group 220, and the lower arc-extinguishing grid plate group 230 are all fixed by the arc-isolating plates 250 and 260. An insulating arc-isolating component 240 is placed between the arc-isolating plates 250 and 260. The insulating arc-isolating component 240 includes an upper arc-isolating plate 241 and a lower arc-isolating plate 242. The arc-isolating plates 241 and 242 are separated by a certain distance h, which serves as a channel for the electric arc to enter the arc-extinguishing chamber. During the process of the electric arc entering the arc-extinguishing device, the electric arc is in close contact with the inner wall of the insulating arc-isolating component, absorbing the heat of the electric arc, accelerating the cooling of the electric arc, and increasing the recombination speed of charged particles in the electric arc, reducing the free gas in the electric arc, thereby accelerating the extinction of the electric arc.

[0056] The insulating arc-blocking component 240 is connected to the arc-blocking plate 250 and arc-blocking plate 260 by means of hot-melt riveting, ultrasonic welding, snap-fit ​​connection or adhesive bonding; the contact support 500 includes an upper contact support 510 and a lower contact support 520. The upper contact support 510 is connected to the lower contact support 520 by means of hot-melt riveting, ultrasonic welding, snap-fit ​​connection or adhesive bonding. After the upper contact support 510 and the lower contact support 520 are assembled, they form a clamping groove with a groove height of h1. The height h is greater than or equal to the groove spacing h1 formed by the combination of the upper contact support and the lower contact support, so that the arc generated when the moving contact and the stationary contact are separated can smoothly enter the arc-extinguishing chamber.

[0057] During the process of the electric arc entering the arc extinguishing device, the electric arc comes into close contact with the inner wall of the insulating arc-blocking component 240, absorbs the heat of the electric arc, accelerates the cooling of the electric arc, and increases the recombination speed of charged particles in the electric arc, reducing the free gas in the electric arc, thereby accelerating the extinction of the electric arc.

[0058] refer to Figure 2 , Figure 3 The insulating arc-extinguishing component 240 can be made of polyamide or polyoxymethylene material with high gas production, which increases the air blowing function of the arc-extinguishing chamber, making the electric arc lengthen more quickly and enter the arc-extinguishing chamber faster, so as to achieve the effect of quickly extinguishing the electric arc.

[0059] refer to Figure 5 A sharp angle 310 is formed at the tail of the moving contact to attract the electric arc, make the electric arc longer and enter the arc extinguishing chamber more quickly, so as to achieve the effect of quickly extinguishing the electric arc. The principle of tip discharge is applied to attract the electric arc, make the electric arc longer, and accelerate the extinguishing of the electric arc.

[0060] By conducting short-circuit photovoltaic breaking tests on two-layer series DC3000V / 60A photovoltaic arrays at an altitude of 4000 meters, the number of breaking cycles reached more than 5, with a breaking time of less than 15ms. Compared with the arc extinguishing device disclosed in the applicant's prior patent CN219105960U, the arc extinguishing capability is significantly improved, as detailed in the table below.

[0061]

[0062] This invention may be implemented in other specific forms without departing from its spirit and essential characteristics. The present embodiments are to be regarded in all respects as exemplary rather than limiting, and the scope of the invention is defined by the appended claims rather than the foregoing description, and all modifications falling within the meaning of the claims and their equivalents are thus included within the scope of this invention.

Claims

1. An arc-extinguishing device for extinguishing an electric arc in an electrical switch, the electrical switch comprising a housing (400), a contact support (500), a moving contact (300), a stationary contact (100), and an arc-extinguishing device (200), characterized in that: The arc-extinguishing device (200) includes: a first group of upper arc-extinguishing grid plates (210) composed of multiple vertically extending arc-extinguishing grid plates; a second group of middle arc-extinguishing grid plates (220) composed of multiple horizontally extending arc-extinguishing grid plates; and a third group of lower arc-extinguishing grid plates (230) composed of multiple vertically extending arc-extinguishing grid plates. The left first arc-extinguishing grid plate (211) of the upper arc-extinguishing grid plate group (210) and the upper first arc-extinguishing grid plate (220) of the middle arc-extinguishing grid plate group (220) are... 221) are connected, the lower first arc extinguishing grid (222) of the middle arc extinguishing grid group (220) is connected to the left first arc extinguishing grid (232) of the lower arc extinguishing grid group (230), the vertically extending arc extinguishing grids of the upper arc extinguishing grid group (210) and the lower arc extinguishing grid group (230) extend along the Y-axis or at a certain angle to the Y-axis, and the horizontally extending arc extinguishing grids of the middle arc extinguishing grid group (220) extend along the X-axis or at a certain angle to the X-axis; The line connecting the lower end of the upper arc-extinguishing grid plate group (210) and the line connecting the right end of the middle arc-extinguishing grid plate group (220) form a sharp angle α1, the vertex of the sharp angle α1 is recessed away from the moving contact, and the line connecting the right end of the middle arc-extinguishing grid plate group (220) and the line connecting the upper end of the lower arc-extinguishing grid plate group (230) form a sharp angle α2, the vertex of the sharp angle α2 is recessed away from the moving contact; The right end of the middle arc-extinguishing grid plate group (220) is connected to form a connecting line L. The extension line of one end of the connecting line L intersects the arc-extinguishing grid plate on the left side of the upper arc-extinguishing grid plate group (210), and the extension line of the other end intersects the arc-extinguishing grid plate on the left side of the lower arc-extinguishing grid plate group (230). The width of the upper end of the upper arc-extinguishing grid plate group (210) is greater than the width of the lower end. The upper end of the arc-extinguishing grid plate on the left side of the middle of the upper arc-extinguishing grid plate group (210) is tilted to the left. The tilt angle of the arc-extinguishing grid plate gradually decreases from left to right. The first arc-extinguishing grid plate (211) on the left side of the upper arc-extinguishing grid plate group (210) forms an acute angle β1 with the Y-axis. The arc-extinguishing grid plate in the middle of the upper arc-extinguishing grid plate group (210) extends along the Y-axis. The upper end of the arc-extinguishing grid plate on the right side of the middle of the upper arc-extinguishing grid plate group (210) is tilted to the right. The tilt angle of the arc-extinguishing grid plate gradually decreases from right to left. The first arc-extinguishing grid plate (212) on the right side of the upper arc-extinguishing grid plate group (210) forms an acute angle β2 with the Y-axis. The spacing between the arc-extinguishing grid plates in the upper arc-extinguishing grid plate group (210) gradually decreases from top to bottom.

2. The arc-extinguishing device for extinguishing electric arcs in an electrical switch according to claim 1, characterized in that: The width of the left end of the central arc-extinguishing grid plate group (220) is greater than the width of the right end. The right end of the arc-extinguishing grid plate in the upper middle part of the central arc-extinguishing grid plate group (220) is inclined downward. The inclination angle of the arc-extinguishing grid plate gradually decreases from top to bottom. The upper first arc-extinguishing grid plate (221) of the central arc-extinguishing grid plate group (220) forms an acute angle β3 with the X-axis. The middle arc-extinguishing grid plate of the central arc-extinguishing grid plate group (220) is arranged along the X-axis. The right end of the lower middle arc-extinguishing grid plate of the central arc-extinguishing grid plate group (220) is inclined upward. The inclination angle of the arc-extinguishing grid plate gradually decreases from bottom to top. The lower first arc-extinguishing grid plate (222) of the central arc-extinguishing grid plate group (220) forms an acute angle β4 with the X-axis. The spacing between each arc-extinguishing grid plate in the central arc-extinguishing grid plate group (220) gradually decreases from left to right.

3. The arc-extinguishing device for extinguishing electric arcs in an electrical switch according to claim 1, characterized in that: The width of the lower end of the lower arc-extinguishing grid plate group (230) is greater than the width of the upper end. The lower end of the arc-extinguishing grid plate of the lower arc-extinguishing grid plate group (230) is inclined to the right. The inclination angle of the arc-extinguishing grid plate gradually decreases from left to right. The first arc-extinguishing grid plate (232) on the left of the lower arc-extinguishing grid plate group (230) forms an acute angle β5 with the Y-axis. The spacing between each arc-extinguishing grid plate of the lower arc-extinguishing grid plate group (230) gradually decreases from bottom to top.

4. The arc-extinguishing device for extinguishing electric arcs in an electrical switch according to claim 1, characterized in that: The preferred range for α1 and α2 is 15 degrees to 60 degrees.

5. The arc-extinguishing device for extinguishing electric arcs in an electrical switch according to any one of claims 1-3, characterized in that: The preferred range of the acute angles β1, β2, β3, β4, and β5 is 5 degrees to 85 degrees.

6. The arc-extinguishing device for extinguishing electric arcs in an electrical switch according to claim 1, characterized in that: The first arc-extinguishing grid plate (212) on the right side of the upper arc-extinguishing grid plate group (210) is in contact with the stationary contact (100).

7. The arc-extinguishing device for extinguishing electric arcs in an electrical switch according to claim 1, characterized in that: The middle part of the arc-extinguishing grid plate group (220) moves closer to the moving contact (300) in the direction of the middle part of the arc-extinguishing grid plate group (220).

8. The arc-extinguishing device for extinguishing electric arcs in an electrical switch according to claim 1, characterized in that: The lower arc-extinguishing grid assembly (230) is provided with an arc-inducing element (231) extending toward the moving contact at its top.

9. The arc-extinguishing device for extinguishing electric arcs in an electrical switch according to claim 1, characterized in that: The arc-extinguishing device (200) includes at least two sheet-like arc-blocking plates for fixing the arc-extinguishing grid plates.

10. The arc-extinguishing device for extinguishing electric arcs in an electrical switch according to claim 1, characterized in that: The arc extinguishing device (200) is provided with an insulating arc-isolating component (240), which includes an upper arc-isolating plate (241) and a lower arc-isolating plate (242). The upper arc-isolating plate (241) and the lower arc-isolating plate (242) are separated by a certain distance h.

11. The arc-extinguishing device for extinguishing electric arcs in an electrical switch according to claim 10, characterized in that: The contact support (500) includes an upper contact support (510) and a lower contact support (520). The distance h between the upper arc diaphragm (241) and the lower arc diaphragm (242) is greater than or equal to the groove distance h1 formed by the combination of the upper contact support (510) and the lower contact support (520).

12. The arc-extinguishing device for extinguishing electric arcs in an electrical switch according to claim 1, characterized in that: The moving contact has a pointed corner (310) at its tail for initiating an arc.

13. An electrical switch, characterized in that, It includes a housing (400), a contact support (500), a moving contact (300), a stationary contact (100), and an arc-extinguishing device (200) as described in any one of claims 1-8.

14. The electrical switch according to claim 13, characterized in that, There are two arc-extinguishing devices (200), which are respectively arranged on both sides of the contact support (500).

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