Arc extinguish chamber and switch device

Abstract

The utility model provides an arc extinguish chamber and a switch device, and relates to the technical field of switches. The arc extinguish chamber comprises a first grid plate, a second grid plate, an insulating part and a permanent magnet. The first grid piece comprises a first base part, the second grid piece comprises a second base part, and the first base part and the second base part are arranged in a spaced mode. The insulating part is arranged between the first base part and the second base part. The insulating part is provided with a blind groove, and a groove opening of the blind groove faces the exhaust side of the arc extinguish chamber. The permanent magnets are installed in the blind grooves. The inner side of the permanent magnet, the inner side of the first base part and the inner side of the second base part are basically aligned, and the inner sides are the sides away from the exhaust side. According to the arc extinguish chamber provided by the invention, the difficulty that an arc enters the arc extinguish chamber when the switching device breaks a small current can be reduced, so that the arc extinguish efficiency of the arc extinguish chamber when the switching device breaks the small current is improved.

Description

Technical Field

[0001] This application relates to the field of switch technology, and in particular to an arc-extinguishing chamber and a switch device. Background Technology

[0002] Switchgear has wide applications in power systems. It is an important device used to close or open one or more circuits to control electrical equipment and ensure the safe and stable operation of circuits. Switchgear is often equipped with an arc-extinguishing chamber to transfer and extinguish the electric arc generated when the moving contact and stationary contact of the switchgear are separated.

[0003] However, in the prior art, when switching devices interrupt small currents, there is a problem that the electric arc has difficulty entering the arc-extinguishing chamber. Utility Model Content

[0004] This application provides an arc-extinguishing chamber and a switching device to reduce the difficulty of the arc entering the arc-extinguishing chamber when the switching device interrupts a small current, thereby improving the arc-extinguishing efficiency of the arc-extinguishing chamber when the switching device interrupts a small current.

[0005] In a first aspect, this application provides an arc-extinguishing chamber, including a first grid plate, a second grid plate, an insulating member, and a permanent magnet. The first grid plate includes a first base, and the second grid plate includes a second base, with the first base and the second base spaced apart. The insulating member is disposed between the first base and the second base. The insulating member has a blind slot, the opening of which faces the exhaust side of the arc-extinguishing chamber. The permanent magnet is mounted in the blind slot. The inner side of the permanent magnet, the inner side of the first base, and the inner side of the second base are substantially aligned, with the inner side being the side furthest from the exhaust side.

[0006] By employing the above-described scheme, an insulating element is provided between the first base and the second base, and a permanent magnet is placed within a blind slot in the insulating element. This allows the permanent magnet to magnetize the first and second grid plates, as well as the arc-extinguishing grid plates adjacent to the permanent magnet, thereby enhancing the magnetism of these adjacent arc-extinguishing grid plates. The enhanced magnetism of the first and second grid plates, and other adjacent arc-extinguishing grid plates, strengthens the attraction of the arc, facilitating the entry of the arc generated when a switching device containing the arc-extinguishing chamber interrupts a small current into the arc-extinguishing chamber. This, in turn, improves the arc-extinguishing efficiency of the arc-extinguishing chamber when the switching device interrupts a small current.

[0007] More importantly, the inner side of the permanent magnet is positioned to be substantially aligned with the inner sides of the first and second bases. Since the electric arc moves from this inner side towards the exhaust side of the arc-extinguishing chamber, the inner side of the permanent magnet is the first part of the permanent magnet to come into contact with the arc. This arrangement allows the permanent magnet to approach the arc as early as possible, thus enhancing its attraction. Furthermore, with the enhanced attraction of the permanent magnet to the arc, its volume does not need to be large. Simply aligning the inner side of a small permanent magnet with the inner sides of the first and second bases allows the arc to be quickly attracted and elongated towards the first and second bases in the initial stage of its formation, achieving a better arc-extinguishing effect while saving costs.

[0008] In one possible design, in the arrangement direction of the first and second grid plates, both the first and second grid plates have gaps between them and the insulating element.

[0009] The above scheme is equivalent to having gaps between the first and second grid plates and the permanent magnet. In this way, the permanent magnet can also act as an arc-extinguishing grid plate to cut the electric arc. This allows the permanent magnet to not only magnetize the first and second grid plates and other adjacent arc-extinguishing grid plates, but also cut the electric arc like an arc-extinguishing grid plate. The arrangement of the permanent magnet will not reduce the number of arc-extinguishing grid plates due to occupying the original arrangement space of the arc-extinguishing grid plates.

[0010] In one possible design, the first grid, the insulating element, and the second grid are arranged in a fan-shaped or parallel configuration in the direction of the first grid and the second grid.

[0011] By arranging the components in a fan shape, the gap between the inner side of the first grid plate and the inner side of the insulating component is smaller than the gap between the outer side of the first grid plate and the outer side of the insulating component. Similarly, the gap between the inner side of the second grid plate and the inner side of the insulating component is smaller than the gap between the outer side of the second grid plate and the outer side of the insulating component. This reduces the resistance to the arc moving towards the exhaust side of the arc-extinguishing chamber, thus improving the efficiency of the arc entering the chamber. By arranging them in parallel, the arc-extinguishing efficiency of the arc-extinguishing chamber is improved when the switching device interrupts small currents, while also enriching the arrangement options for the first grid plate, the insulating component, and the second grid plate.

[0012] In one possible design, the insulator is also provided with a grid slot, and the arc-extinguishing chamber also includes a third grid, which is installed in the grid slot.

[0013] Through the above-described scheme, the insulating component in this application can be used not only to install the aforementioned permanent magnet but also to install the third grid plate, achieving the effect of functional reuse of the structural component. Furthermore, the third grid plate, installed in the grid plate slot, can attract and extinguish the electric arc. The installation of the third grid plate effectively utilizes the space originally occupied by the insulating component for the arrangement of the arc-extinguishing grid plates, further improving the arc-extinguishing effect of the arc-extinguishing chamber while enhancing the arc-extinguishing effect of the permanent magnet.

[0014] In one possible design, the arc-extinguishing chamber further includes a first mounting plate and a second mounting plate spaced apart. The first grid plate, the insulating element, and the second grid plate are located between the first mounting plate and the second mounting plate, and both the first grid plate, the insulating element, and the second grid plate are mounted on the first mounting plate and the second mounting plate.

[0015] The first and second mounting plates provide mounting support for all arc-extinguishing grids, including the first and second grids, as well as the insulating components, so that all arc-extinguishing grids and insulating components can form an integral structure with the first and second mounting plates, thereby improving the structural stability of the arc-extinguishing chamber.

[0016] In one possible design, the arc-extinguishing chamber further includes a first inner partition and a second inner partition positioned opposite each other and spaced apart. The first inner partition is located on the side of the first mounting plate facing the second mounting plate, and the second inner partition is located on the side of the second mounting plate facing the first mounting plate. A channel for the movement of the moving contact is formed between the first inner partition and the second inner partition.

[0017] The first inner partition and the second inner partition are provided, and a channel for the movement of the moving contact is formed between the first inner partition and the second inner partition. This can restrict the movement of the moving contact, reduce the possibility of the moving contact deflecting when it moves in the channel, and improve the reliability of the contact between the moving contact and the stationary contact.

[0018] In one possible design, the first inner partition is integrally connected to the first mounting plate.

[0019] The above solution can save the assembly process of the first inner partition and the first mounting plate, thus improving the assembly efficiency of the arc-extinguishing chamber.

[0020] In one possible design, the first mounting plate is provided with a first groove, and the insulating element is provided with a first protrusion on the side facing the first mounting plate. The first protrusion is adapted to the first groove to install the insulating plate onto the first mounting plate.

[0021] The above scheme enriches the connection methods between the insulating component and the first mounting plate. Furthermore, by using a combination of protrusions and grooves to connect the insulating component to the first mounting plate, the insulating component can be installed onto the first mounting plate after the arc-extinguishing grid, the first mounting plate, and the second mounting plate are assembled. This means the installation of the insulating component is not limited to being performed before the assembly of the arc-extinguishing grid, the first mounting plate, and the second mounting plate, thus improving the flexibility of the insulating component installation sequence.

[0022] In one possible design, the second inner partition is integrally connected to the second mounting plate.

[0023] The above solution can save the assembly process of the second inner partition and the second mounting plate, thus improving the assembly efficiency of the arc-extinguishing chamber.

[0024] Secondly, this application provides a switching device, including a moving contact, a stationary contact, and an arc-extinguishing chamber as described in the first aspect. The stationary contact is located on one side of the arc-extinguishing chamber, and the moving contact portion is located within the arc-extinguishing chamber. The moving contact can rotate relative to the stationary contact to make contact with or separate from the stationary contact. The arc-extinguishing chamber is used to extinguish the electric arc generated when the moving contact separates from the stationary contact.

[0025] The advantages of the switching device provided in the second aspect and the various possible designs of the second aspect can be seen in the advantages of the first aspect and the various possible implementations of the first aspect, and will not be repeated here. Attached Figure Description

[0026] Figure 1 This is a partial structural schematic diagram of a switching device provided in an embodiment of this application.

[0027] Figure 2 This is a schematic diagram of the structure of an arc-extinguishing chamber provided in an embodiment of this application.

[0028] Figure 3 This is an exploded view of an arc-extinguishing chamber provided in an embodiment of this application.

[0029] Figure 4 This is a partial structural schematic diagram of an arc-extinguishing chamber provided in an embodiment of this application.

[0030] Figure 5 This is a schematic diagram of the structure of an insulating component provided in an embodiment of this application.

[0031] Explanation of reference numerals in the attached figures:

[0032] 100. Moving contact;

[0033] 200. Stationary contact;

[0034] 300. Arc-extinguishing chamber;

[0035] 310. First grid plate; 311. First base; 312. First grid plate leg;

[0036] 320. Second grid plate; 321. Second base; 322. Second grid plate leg;

[0037] 330. Insulating component; 331. Blind slot; 332. Grid slot; 333. First protrusion; 334. Second protrusion;

[0038] 340, Permanent magnet; 350, Exhaust side; 360, First mounting plate; 361, First slot; 370, Second mounting plate; 380, First inner partition; 390, Second inner partition. Detailed Implementation

[0039] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0040] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs; the terminology used herein in the specification of the application is for the purpose of describing particular embodiments only and is not intended to limit the application; the terms “comprising” and “having”, and any variations thereof, in the specification, claims and drawings of this application are intended to cover non-exclusive inclusion.

[0041] The term "embodiment" as used herein means that a particular feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this application. The appearance of the phrase "embodiment" in various places throughout the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment mutually exclusive with other embodiments. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.

[0042] In this article, the term "and / or" is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can mean: A exists, A and B exist simultaneously, or B exists. Additionally, the character " / " in this article generally indicates that the preceding and following related objects have an "or" relationship.

[0043] The directional terms appearing in the following description refer to the directions shown in the figures and are not intended to limit the specific structure of this application. For example, in the description of this application, the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the figures. They are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application.

[0044] Furthermore, the terms "first," "second," etc., in the specification and claims of this application or in the aforementioned drawings are used to distinguish different objects rather than to describe a specific order, and may explicitly or implicitly include one or more of the features.

[0045] In the description of this application, unless otherwise stated, "multiple" means two or more (including two), and similarly, "multiple groups" means two or more (including two groups).

[0046] In the description of this application, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, "connection" or "joining" in mechanical structures can refer to a physical connection, such as a fixed connection, for example, a connection fixed by a partition, such as a connection fixed by screws, bolts, or other partitions; a physical connection can also be a detachable connection, such as a snap-fit ​​or interlocking connection; a physical connection can also be an integral connection, such as a connection formed by welding, bonding, or integral molding. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0047] Switchgear is an important component in electrical engineering used to control the on / off state of circuits. It comes in various types and has special functions, and is widely used in power systems. Switchgear includes disconnecting switches, dual-power switches, circuit breakers, etc. The accompanying drawings of this application use a disconnecting switch as an example for illustration, but this does not constitute a limitation on the technical solution of this application.

[0048] Figure 1 This is a partial structural schematic diagram of a switching device provided in an embodiment of this application. Figure 2 This is a schematic diagram of the structure of an arc-extinguishing chamber provided in an embodiment of this application, as shown below. Figure 1 and Figure 2As shown, the switching device includes a moving contact 100, a stationary contact 200, and an arc-extinguishing chamber 300. The stationary contact 200 is located on one side of the arc-extinguishing chamber 300, and the moving contact 100 is partially located inside the arc-extinguishing chamber 300. The moving contact 100 can rotate relative to the stationary contact 200 to make contact with or separate from the stationary contact 200. The arc-extinguishing chamber 300 is used to extinguish the electric arc generated when the moving contact 100 separates from the stationary contact 200.

[0049] The stationary contact 200 is fixedly mounted on the housing of the switching device and located on one side of the arc-extinguishing chamber 300. The moving contact 100 is rotatably connected to the housing. The end of the moving contact 100 that mates with the stationary contact 200 can extend into the arc-extinguishing chamber 300 and can move within the arc-extinguishing chamber 300 to approach and contact the stationary contact 200, or to move away from and separate from the stationary contact 200. The position where the moving contact 100 is rotatably connected to the housing is the rotation center of the moving contact 100.

[0050] When the switching device interrupts the current, the moving contact 100 separates from the stationary contact 200, generating an electric arc. The arc-extinguishing chamber 300 contains multiple spaced-apart iron arc-extinguishing grids. The arc is attracted by the magnetic field of these grids and moves towards them, away from the rotation center of the moving contact 100. The spaced-apart grids cut and lengthen the arc, increasing its impedance and raising its voltage. When the arc voltage exceeds the system voltage, the arc extinguishes.

[0051] In existing technology, when a switching device interrupts a large current, such as a current several times greater than the rated current, the arc's movement trend is very clear, and the arc easily enters the arc-extinguishing chamber 300 for extinguishing. However, when the switching device interrupts a small current, such as a current less than the rated current, such as 16 amps or 32 amps, the arc often remains between the moving contact 100 and the stationary contact 200, and is not easy to move towards the arc-extinguishing grid plate away from the rotation center of the moving contact 100, that is, it is difficult to enter the arc-extinguishing chamber 300. As a result, the arc may not be extinguished, or the arc extinguishing time may be too long, which can easily burn out the moving contact 100, the stationary contact 200, and the arc-extinguishing chamber 300.

[0052] This application improves the structure of the arc-extinguishing chamber 300, reducing the difficulty for an arc to enter the arc-extinguishing chamber 300 when the switching device interrupts a small current. This improves the arc-extinguishing efficiency of the arc-extinguishing chamber 300 when the switching device interrupts a small current, and reduces the possibility of arc burnout of the moving contact 100, the stationary contact 200, and the arc-extinguishing chamber 300. Therefore, a switching device including this arc-extinguishing chamber 300 can also reduce the difficulty for an arc to enter the arc-extinguishing chamber 300 when interrupting a small current.

[0053] The structure of the arc-extinguishing chamber 300 in this application will be described in detail below with reference to the accompanying drawings.

[0054] Figure 3This is an exploded view of an arc-extinguishing chamber provided in an embodiment of this application. Figure 4 This is a partial structural schematic diagram of an arc-extinguishing chamber provided in an embodiment of this application, as shown below. Figures 2 to 4 As shown, the arc-extinguishing chamber 300 includes a first grid plate 310, a second grid plate 320, an insulating member 330, and a permanent magnet 340. The first grid plate 310 includes a first base 311, and the second grid plate 320 includes a second base 321, with the first base 311 and the second base 321 spaced apart. The insulating member 330 is disposed between the first base 311 and the second base 321.

[0055] The first grid plate 310 and the second grid plate 320 are any two adjacent arc-extinguishing grid plates arranged at intervals in the arc-extinguishing chamber 300. The first grid plate 310 and the second grid plate 320 are approximately U-shaped. Both the first grid plate 310 and the second grid plate 320 have openings, and the openings of the first grid plate 310 and the second grid plate 320 face the same direction. The remaining arc-extinguishing grid plates in the arc-extinguishing chamber 300, excluding the first grid plate 310 and the second grid plate 320, are also approximately U-shaped. The openings of all the arc-extinguishing grid plates face the same direction. The side of the multiple arc-extinguishing grid plates opposite to the opening direction is the exhaust side 350 of the arc-extinguishing chamber 300.

[0056] The first grid plate 310 includes a first base 311 and two first grid plate legs 312, one first grid plate leg 312 being connected to one side of the first base 311 and the other first grid plate leg 312 being connected to the other side of the first base 311. Similarly, the second grid plate 320 includes a second base 321 and two second grid plate legs 322, one second grid plate leg 322 being connected to one side of the second base 321 and the other second grid plate leg 322 being connected to the other side of the second base 321.

[0057] The insulating element 330 can be any shape, such as cylindrical or cuboid. The insulating element 330 can be made of any insulating and high-temperature resistant material, and this application does not limit the shape and material of the insulating element 330.

[0058] Figure 5 This is a structural schematic diagram of an insulating component 330 provided in an embodiment of this application, combined with... Figures 3 to 5 The insulating component 330 is provided with a blind slot 331, the opening of which faces the exhaust side 350 of the arc-extinguishing chamber 300. The permanent magnet 340 is installed in the blind slot 331.

[0059] The slot opening of the blind slot 331 faces the exhaust side 350 of the arc-extinguishing chamber 300, so that the permanent magnet 340 can be installed from the exhaust side 350 of the arc-extinguishing chamber 300 into the blind slot 331.

[0060] The shape and size of the blind slot 331 can be set according to the shape and size of the permanent magnet 340. The shape of the blind slot 331 is adapted to the shape of the permanent magnet 340, and the size of the blind slot 331 can be basically equal to the size of the permanent magnet 340. In this way, the parts of the permanent magnet 340 that are more likely to come into contact with the electric arc can be blocked by the slot wall of the blind slot 331, reducing the possibility of the permanent magnet 340 demagnetizing due to high temperature.

[0061] The permanent magnet 340 can be interference-fitted with the blind slot 331 to reduce the possibility of the permanent magnet 340 falling out of the blind slot 331 after being installed in the blind slot 331.

[0062] The wall of the blind slot 331 may be provided with a guide slope to provide guidance for the installation of the permanent magnet 340 into the blind slot 331, thereby reducing the difficulty of installing the permanent magnet 340 into the blind slot 331.

[0063] In this application, the inner side of the permanent magnet 340, the inner side of the first base 311, and the inner side of the second base 321 are substantially aligned, with the inner side being the side away from the exhaust side 350.

[0064] Specifically, the inner side of the permanent magnet 340 refers to the side of the permanent magnet 340 away from the exhaust side 350, or the side of the permanent magnet 340 near the bottom of the blind slot 331, wherein the bottom of the blind slot 331 is opposite to the opening of the blind slot 331. The inner side of the first base 311 refers to the side of the first base 311 away from the exhaust side 350, or the side of the first base 311 near the first grid leg 312. The inner side of the second base 321 refers to the side of the second base 321 away from the exhaust side 350, or the side of the second base 321 near the second grid leg 322.

[0065] The permanent magnet 340 is installed in the blind groove 331 of the insulating member 330. The bottom of the blind groove 331 has a certain thickness. In order to achieve basic alignment of the inner sides of the permanent magnet 340, the inner sides of the first base 311, and the inner sides of the second base 321, the thickness of the bottom of the blind groove 331 can be set to be relatively small. If the thickness of the bottom of the blind groove 331 is ignored, the inner sides of the permanent magnet 340, the inner sides of the first base 311, and the inner sides of the second base 321 can be basically aligned in this application. Small dimensional differences such as 1 mm, 2 mm, and 3 mm between the inner sides of the permanent magnet 340, the inner sides of the first base 311, and the inner sides of the second base 321 can all be understood as being basically aligned.

[0066] In this embodiment, an insulating member 330 is provided between the first base 311 and the second base 321, and a permanent magnet 340 is provided in the blind slot 331 of the insulating member 330. Thus, the permanent magnet 340 can magnetize the first grid plate 310, the second grid plate 320, and the arc-extinguishing grid plate adjacent to the permanent magnet 340, enhancing the magnetism of the first grid plate 310, the second grid plate 320, and other arc-extinguishing grid plates adjacent to the permanent magnet 340. The enhanced magnetism of the first grid plate 310, the second grid plate 320, and other arc-extinguishing grid plates adjacent to the permanent magnet 340 strengthens the attraction to the electric arc, facilitating the entry of the electric arc generated when the switching device containing the arc-extinguishing chamber 300 interrupts a small current into the arc-extinguishing chamber 300, thereby improving the arc-extinguishing efficiency of the arc-extinguishing chamber 300 when the switching device interrupts a small current.

[0067] More importantly, the inner side of the permanent magnet 340 is substantially aligned with the inner sides of the first base 311 and the second base 321. Since the electric arc moves from this inner side to the exhaust side 350 of the arc-extinguishing chamber 300, the inner side of the permanent magnet 340 is the first part of the permanent magnet 340 to come into contact with the arc. This arrangement allows the permanent magnet 340 to approach the arc as early as possible, thereby enhancing its attraction effect. Furthermore, with the enhanced attraction effect of the permanent magnet 340 on the arc, its volume does not need to be large. Simply aligning the inner side of the small-volume permanent magnet 340 substantially with the inner sides of the first base 311 and the second base 321 allows the arc to be quickly attracted and elongated towards the first base 311 and the second base 321 in the initial stage of its generation, facilitating a better arc-extinguishing effect while saving costs.

[0068] In this application, the inner side of the permanent magnet 340 is substantially aligned with the inner side of the first base 311 and the inner side of the second base 321, so that the inner side of the permanent magnet 340 does not protrude from the inner side of the first base 311 and the inner side of the second base 321, and therefore will not interfere with the movement of the moving contact 100 in the arc-extinguishing chamber 300.

[0069] In some embodiments, in the arrangement direction of the first gate plate 310 and the second gate plate 320, both the first gate plate 310 and the second gate plate 320 have a gap with the insulating member 330.

[0070] The gap between the insulating member 330 and the first grid plate 310 can be equal to the gap between the insulating member 330 and the second grid plate 320, and can also be equal to the gap between the other two adjacent arc-extinguishing grid plates. Of course, the gap sizes involved can also be unequal, and this application does not limit this.

[0071] With the above scheme, it is equivalent to having a gap between the first grid plate 310 and the second grid plate 320 and the permanent magnet 340. In this way, the permanent magnet 340 can also act as an arc-extinguishing grid plate to cut the electric arc. This allows the permanent magnet 340 to not only magnetize the first grid plate 310, the second grid plate 320 and other adjacent arc-extinguishing grid plates, but also cut the electric arc like an arc-extinguishing grid plate. The arrangement of the permanent magnet 340 will not reduce the number of arc-extinguishing grid plates by occupying the original arrangement space of the arc-extinguishing grid plates.

[0072] In the arrangement direction of the first grid plate 310 and the second grid plate 320, in some examples, the first grid plate 310, the insulating member 330 and the second grid plate 320 can be arranged in a fan shape.

[0073] In this arrangement, the gap between the inner side of the first grid plate 310 and the inner side of the insulating member 330 is smaller than the gap between the outer side of the first grid plate 310 and the outer side of the insulating member 330. Similarly, the gap between the inner side of the second grid plate 320 and the inner side of the insulating member 330 is smaller than the gap between the outer side of the second grid plate 320 and the outer side of the insulating member 330. This reduces the resistance to the movement of the arc towards the exhaust side 350 of the arc-extinguishing chamber 300, thereby improving the efficiency of the arc entering the arc-extinguishing chamber 300.

[0074] In this context, the inner side of the first grid plate 310 refers to the side of the first grid plate 310 that first contacts the electric arc, and the outer side of the first grid plate 310 refers to the side of the first grid plate 310 that subsequently contacts the electric arc. The explanations for the inner side of the insulating member 330 and the inner side of the second grid plate 320 can refer to the explanations for the inner side of the first grid plate 310, and the explanations for the outer side of the second grid plate 320 and the outer side of the insulating member 330 can refer to the explanations for the outer side of the first grid plate 310; they will not be elaborated upon here.

[0075] In other examples, the first grid plate 310, the insulator 330, and the second grid plate 320 can be arranged in parallel. This arrangement improves the arc-extinguishing efficiency of the arc-extinguishing chamber 300 when the switching device interrupts small currents, while also enriching the arrangement options for the first grid plate 310, the insulator 330, and the second grid plate 320.

[0076] Please continue to refer to Figure 5 ,like Figure 5 As shown, the insulating element 330 may also be provided with a grid groove 332. Based on this, the arc-extinguishing chamber 300 may also include a third grid, which is installed in the grid groove 332.

[0077] The number of grid slots 332 can be 1, 2, etc. Figure 5The number of grid slots 332 shown is 2, and the two grid slots 332 are located on both sides of the blind slot 331, but this does not constitute a limitation on the number of grid slots 332 or the setting position of the grid slots 332.

[0078] The grid slot 332 can penetrate the insulating member 330 in a direction from the outside to the inside. In this way, after the third grid is installed in the grid slot 332, it can effectively play its role in attracting and extinguishing electric arcs.

[0079] A grid slot 332 is provided on the insulating component 330, and a third grid plate is installed in the grid slot 332. This allows the insulating component 330 to be used not only to install the aforementioned permanent magnet 340 but also to install the third grid plate, achieving the effect of functional reuse of the structural component. In addition, the third grid plate installed in the grid slot 332 can attract and extinguish the electric arc. The installation of the third grid plate effectively utilizes the original arc-extinguishing grid plate arrangement space occupied by the insulating component 330, further improving the arc-extinguishing effect of the arc-extinguishing chamber 300 while increasing the arc-extinguishing effect of the permanent magnet 340.

[0080] Please continue to refer to Figure 2 and Figure 3 The arc-extinguishing chamber 300 may further include a first mounting plate 360 ​​and a second mounting plate 370 spaced apart. The first grid plate 310, the insulating element 330 and the second grid plate 320 are located between the first mounting plate 360 ​​and the second mounting plate 370, and the first grid plate 310, the insulating element 330 and the second grid plate 320 are all mounted on the first mounting plate 360 ​​and the second mounting plate 370.

[0081] The first mounting plate 360 ​​and the second mounting plate 370 can have the same structure. The first mounting plate 360 ​​and the second mounting plate 370 are spaced apart, thus forming a space between them for arranging a plurality of arc-extinguishing grids and insulating elements 330. The plurality of arc-extinguishing grids and insulating elements 330 can be arranged between the first mounting plate 360 ​​and the second mounting plate 370 in a fan-shaped or parallel arrangement as described above.

[0082] All arc-extinguishing grids, including the first grid plate 310 and the second grid plate 320, can be installed on the first mounting plate 360 ​​and the second mounting plate 370 by means of riveting or plugging.

[0083] In some examples, such as Figures 2 to 5As shown, the insulating member 330 may have a first protrusion 333 on the side facing the first mounting plate 360, and a second protrusion 334 on the side facing the second mounting plate 370. Correspondingly, the first mounting plate 360 ​​may have a first slot 361 on the side facing the second mounting plate 370, and the second mounting plate 370 may have a second slot on the side facing the first mounting plate 360. The first protrusion 333 is inserted into the first slot 361, and the second protrusion 334 is inserted into the second slot, allowing the insulating member 330 to be connected to both the first mounting plate 360 ​​and the second mounting plate 370.

[0084] In other examples, the first mounting plate 360 ​​may be provided with a first groove, and the insulating member 330 may be provided with a first protrusion 333 on the side facing the first mounting plate 360, the first protrusion 333 being adapted to the first groove. The first protrusion 333 extends into the first groove from the outside and slides along the first groove to a suitable position, so that the insulating member 330 can be mounted on the first mounting plate 360.

[0085] Similarly, the second mounting plate 370 may be provided with a second sliding groove, and the insulating member 330 may be provided with a second protrusion 334 on the side facing the second mounting plate 370, the second protrusion 334 being adapted to the second sliding groove. The second protrusion 334 extends into the second sliding groove from the outside and slides along the second sliding groove to a suitable position, so that the insulating member 330 can be installed on the second mounting plate 370.

[0086] The insulating element 330 can also be connected to the first mounting plate 360 ​​and the second mounting plate 370 through other structures or other means, which is not limited in this application.

[0087] The first mounting plate 360 ​​and the second mounting plate 370 provide mounting support for all arc-extinguishing grids, including the first grid plate 310 and the second grid plate 320, as well as the insulating component 330, so that all arc-extinguishing grids and insulating components 330 can form an integral structure with the first mounting plate 360 ​​and the second mounting plate 370, thereby improving the structural stability of the arc-extinguishing chamber 300.

[0088] Further, please continue to refer to Figures 1 to 5 The arc-extinguishing chamber 300 may further include a first inner partition 380 and a second inner partition 390 positioned opposite each other and spaced apart. The first inner partition 380 is located on the side of the first mounting plate 360 ​​facing the second mounting plate 370, and the second inner partition 390 is located on the side of the second mounting plate 370 facing the first mounting plate 360. A channel for the movement of the moving contact 100 is formed between the first inner partition 380 and the second inner partition 390.

[0089] The first inner partition 380 and the second inner partition 390 are generally located on the side where the arc-extinguishing grid opening is located. A gap exists between the first inner partition 380 and the second inner partition 390, which communicates with the opening of the arc-extinguishing grid and forms a channel for the moving contact 100 to move. The end of the moving contact 100 can extend into this channel and move along it to contact or separate from the stationary contact 200.

[0090] The width of the channel can be slightly greater than the thickness of the moving contact 100. This not only ensures that the moving contact 100 moves normally along the channel, but also allows the wall of the channel to provide a limiting effect for the moving contact 100, reducing the possibility of the moving contact 100 deflecting during its movement.

[0091] The first inner partition 380 and the second inner partition 390 can be made of thermosetting materials. Since the dimensions on the side where the opening is located are typically smaller, using thermosetting materials for the first inner partition 380 and the second inner partition 390 can reduce the possibility of them melting and deforming due to the heat of the electric arc, thus improving their service life.

[0092] By setting a first inner partition 380 and a second inner partition 390, and forming a channel between the first inner partition 380 and the second inner partition 390 for the movement of the moving contact 100, the movement of the moving contact 100 can be restricted, which helps to reduce the possibility of the moving contact 100 deflecting when moving within the channel, and improves the reliability of the contact between the moving contact 100 and the stationary contact 200. In addition, a narrow gap can be formed between the first inner partition 380 and the second inner partition 390, which can effectively prevent the arc from moving in the opposite direction towards the rotation center of the moving contact 100, and to a certain extent can also promote the arc to move closer to the exhaust side 350, which is conducive to the extinguishing of the arc.

[0093] In one possible implementation, the first inner partition 380 can be connected to the first mounting plate 360 ​​by means of screws.

[0094] In another possible implementation, the first inner partition 380 can also be integrally connected with the first mounting plate 360. Alternatively, the first inner partition 380 and the first mounting plate 360 ​​can be integrally formed. The first inner partition 380 and the first mounting plate 360 ​​can be integrally formed using insulating material, which saves on the assembly process of the first inner partition 380 and the first mounting plate 360, thus improving the assembly efficiency of the arc-extinguishing chamber 300.

[0095] Similarly, the second inner partition 390 can be connected to the second mounting plate 370 by screws. Alternatively, the second inner partition 390 can be integrally connected to the second mounting plate 370.

[0096] In summary, the arc-extinguishing chamber provided in this application has an insulating member 330 disposed between the first base 311 and the second base 321, and a permanent magnet 340 disposed in the blind slot 331 of the insulating member 330, thereby enhancing the magnetism of the arc-extinguishing grid plates, such as the first grid plate 310 and the second grid plate 320, which are adjacent to the permanent magnet 340. Therefore, the attraction to the electric arc can be strengthened, facilitating the entry of the arc generated when the switching device containing the arc-extinguishing chamber 300 interrupts a small current into the arc-extinguishing chamber 300, thereby improving the arc-extinguishing efficiency of the arc-extinguishing chamber 300 when the switching device interrupts a small current.

[0097] In this design, the inner side of the permanent magnet 340 is substantially aligned with the inner sides of the first base 311 and the second base 321, allowing the permanent magnet 340 to approach the electric arc as early as possible to enhance its attraction effect. Furthermore, the permanent magnet 340 does not need to be large in size; simply aligning the inner side of the small-volume permanent magnet 340 with the inner sides of the first base 311 and the second base 321 allows the electric arc to be quickly attracted and elongated towards the first base 311 and the second base 321 in the initial stage of its generation, achieving a better arc-extinguishing effect while saving costs.

Claims

1. An arc-extinguishing chamber, characterized in that, include: A first grid plate and a second grid plate, wherein the first grid plate includes a first base and the second grid plate includes a second base, and the first base and the second base are spaced apart; An insulating element is disposed between the first base and the second base; the insulating element is provided with a blind groove, the opening of the blind groove facing the exhaust side of the arc-extinguishing chamber; A permanent magnet is installed in the blind slot; The inner sides of the permanent magnet, the inner sides of the first base, and the inner sides of the second base are substantially aligned, with the inner side being the side furthest from the exhaust side.

2. The arc-extinguishing chamber according to claim 1, characterized in that, In the arrangement direction of the first and second grid plates, both the first and second grid plates have gaps between themselves and the insulating member.

3. The arc-extinguishing chamber according to claim 2, characterized in that, In the arrangement direction of the first grid and the second grid, the first grid, the insulating element and the second grid are arranged in a fan shape or in parallel.

4. The arc-extinguishing chamber according to claim 2, characterized in that, The insulating component is further provided with a grid slot, and the arc-extinguishing chamber further includes a third grid, which is installed in the grid slot.

5. The arc-extinguishing chamber according to claim 1, characterized in that, It also includes a first mounting plate and a second mounting plate that are spaced apart; The first grid plate, the insulating element, and the second grid plate are located between the first mounting plate and the second mounting plate, and the first grid plate, the insulating element, and the second grid plate are all mounted on the first mounting plate and the second mounting plate.

6. The arc-extinguishing chamber according to claim 5, characterized in that, It also includes a first inner partition and a second inner partition that are positioned opposite each other and spaced apart, wherein the first inner partition is located on the side of the first mounting plate facing the second mounting plate, and the second inner partition is located on the side of the second mounting plate facing the first mounting plate; A channel for the movement of the moving contact is formed between the first inner partition and the second inner partition.

7. The arc-extinguishing chamber according to claim 6, characterized in that, The first inner partition is integrally connected to the first mounting plate.

8. The arc-extinguishing chamber according to claim 7, characterized in that, The first mounting plate is provided with a first sliding groove, and the insulating member is provided with a first protrusion on the side facing the first mounting plate. The first protrusion is adapted to the first sliding groove to install the insulating plate on the first mounting plate.

9. The arc-extinguishing chamber according to claim 6, characterized in that, The second inner partition is integrally connected to the second mounting plate.

10. A switching device, characterized in that, Includes a moving contact, a stationary contact, and the arc-extinguishing chamber as described in any one of claims 1 to 9; The stationary contact is located on one side of the arc-extinguishing chamber, and the moving contact is located within the arc-extinguishing chamber. The moving contact can rotate relative to the stationary contact to contact or separate from the stationary contact. The arc-extinguishing chamber is used to extinguish the electric arc generated when the moving contact separates from the stationary contact.

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