Arc extinguish chamber and circuit breaker

Abstract

The utility model provides an arc extinguish chamber and a circuit breaker, and relates to the technical field of electrical connection devices. The arc extinguishing chamber comprises a mounting wall plate, an arc extinguishing grid plate group and a permanent magnet, the mounting wall plate is an insulating plate, and the mounting wall plate comprises an inner side and an outer side which are opposite in position. The arc-extinguishing grid sheet group comprises a plurality of arc-extinguishing grid sheets, and a gap is arranged between two adjacent arc-extinguishing grid sheets. And the arc extinguishing grid sheets are fixedly arranged on the inner side of the mounting wall plate. The permanent magnet is fixedly arranged on the outer side of the mounting wall plate and used for guiding an electric arc to move in the arc chute sheet group, and the permanent magnet and the arc chute sheet group are insulated through the mounting wall plate. The arc extinguishing chamber provided by the utility model can play a role in accelerating the extinguishing of a direct-current arc, also can enable the permanent magnet and the arc extinguishing grid pieces to be insulated, avoids the conduction between the permanent magnet and the arc extinguishing grid pieces, is simple in structure, can be used for the arc extinguishing of a small-current circuit breaker, and can be better used for the arc extinguishing of a large-current circuit breaker.

Description

Technical Field

[0001] The present application relates to the technical field of electrical connection devices, and in particular to an arc extinguishing chamber and a circuit breaker. Background Art

[0002] Circuit breakers are an important component of power distribution equipment. They are mainly used in various low-voltage power systems to connect and disconnect the current in the power grid circuit, and to protect the lines and power equipment from overload, undervoltage, short circuit, single-phase grounding and other faults. When the fault current appears, the controller of the circuit breaker gives a command to the release, and the release drives the mechanism to operate, and the mechanism drives the contacts to disconnect. After the contacts are disconnected, an arc will be generated. As the core component of the circuit breaker, the arc extinguishing chamber can rely on multiple arc extinguishing grids to divide the arc into multiple short arcs, increase the arc voltage, so as to extinguish the arc and ensure the normal use of the circuit breaker.

[0003] Under the background of carbon neutrality, photovoltaic and new energy industries are developing rapidly, and the circuit breaker industry is also developing continuously with the development of photovoltaic and new energy. Circuit breakers need to adapt to use in DC environments, and the arc extinguishing chamber of DC circuit breakers is particularly important. Utility Model Content

[0004] The present application provides an arc extinguishing chamber, which can improve the arc extinguishing capability of a DC circuit breaker, accelerate the arc extinguishing speed of the DC circuit breaker, and reduce contact erosion.

[0005] The technical solutions of this application are as follows:

[0006] The present application provides an arc extinguishing chamber, comprising a mounting wall plate, an arc extinguishing grid group and a permanent magnet. The mounting wall plate is an insulating plate, and the mounting wall plate comprises an inner side and an outer side which are opposite to each other. The arc extinguishing grid group comprises a plurality of arc extinguishing grids, and there is a gap between two adjacent arc extinguishing grids. The arc extinguishing grid is fixedly arranged on the inner side of the mounting wall plate. The permanent magnet is fixedly arranged on the outer side of the mounting wall plate, and is used to guide the arc to move toward the arc extinguishing grid group, and the permanent magnet is insulated from the arc extinguishing grid group by the mounting wall plate.

[0007] According to the embodiment, the present application sets an arc extinguishing grid group on the inner side of the mounting wall plate, sets a permanent magnet on the outer side of the mounting wall plate, and the permanent magnet and the arc extinguishing grid group are insulated from each other. In this way, when the circuit breaker contact is disconnected, the magnetic field generated by the permanent magnet located on the outer side of the mounting wall plate can guide the DC arc to move in the arc extinguishing grid group to accelerate the extinguishing of the DC arc. In addition, due to the obstruction of the mounting wall plate, the DC arc will not contact the permanent magnet on the outer side of the mounting wall plate, so that no current path will be generated between the permanent magnet and the arc extinguishing grid group, affecting the arc extinguishing ability of the arc extinguishing grid group. Therefore, the arc extinguishing chamber of the present application can accelerate the extinguishing of the DC arc through the reasonable arrangement of the permanent magnet, and can insulate the permanent magnet from the arc extinguishing grid to avoid the conduction between the permanent magnet and the arc extinguishing grid, and the structure is simple and the operation is reliable. It can not only be used for arc extinguishing of small current circuit breakers, but also can be used for arc extinguishing of large current circuit breakers, shorten the arc extinguishing time, and reduce contact ablation.

[0008] In a possible design, there are two mounting wall plates, which are arranged on opposite sides of the arc-extinguishing grid group. One or more permanent magnets are arranged on the outer sides of the two mounting wall plates.

[0009] According to the embodiment, the number of mounting wall plates is two, and one or more permanent magnets are disposed on the outer sides of the two mounting wall plates, which can enhance the guiding effect of the magnetic field on the arc and further accelerate the extinction of the arc.

[0010] In one possible design, the arc extinguishing chamber includes a gas producing component, which is arranged on the outside of the mounting wall panel. The mounting wall panel is provided with a gas channel connecting the inside and the outside. The arc extinguishing gas generated by the gas producing component can flow to the arc extinguishing grid group through the gas channel.

[0011] Through the implementation provided, the arc will flow from the grid group inlet to the grid group outlet under the dual effects of the magnetic field and the arc extinguishing gas, and the arc will be quickly extinguished. In addition, the present application arranges the gas-producing component on the outside of the mounting wall plate, and there is a mounting wall plate between the gas-producing component and the high-temperature arc. The heat is transferred to the gas-producing component through the mounting wall plate and the gas channel. In this way, the heat received by the gas-producing component is relatively mild, the consumption is slow, and the number of times it is used is more, and the use time is longer.

[0012] In a possible design, a receiving cavity is arranged outside the mounting wall plate, and a gas channel connects the receiving cavity with the inner side. The permanent magnet and the gas generating component are located in the same receiving cavity, and the gas generating component is arranged close to the gas channel, and the permanent magnet is arranged on the side of the gas generating component away from the gas channel.

[0013] According to this embodiment, the gas-producing component and the permanent magnet are arranged in the same accommodating cavity, and the permanent magnet is arranged on the side of the gas-producing component away from the gas channel. In this way, the process of gluing and riveting the gas-producing component can be omitted, the number of accommodating cavities can be reduced, the structure of the arc extinguishing chamber can be simplified, and the functions of the gas-producing component and the permanent magnet will not be affected.

[0014] In a possible design, a mounting groove is provided on a side of the gas producing component away from the gas channel, the permanent magnet is located in the mounting groove, and the groove wall of the mounting groove wraps around the side wall of the permanent magnet.

[0015] The permanent magnet is arranged in the installation groove, and the groove wall of the installation groove wraps the permanent magnet. In this way, even if a high-energy arc is transmitted into the accommodating cavity through the gas channel, since the permanent magnet is located in the installation groove formed on the side of the gas-producing component, the groove wall of the installation groove isolates the arc, and the arc is not easy to contact the permanent magnet, thereby improving the insulation performance between the permanent magnet and the arc extinguishing grid group, and improving the reliability of the operation of the two.

[0016] In a possible design, the arc extinguishing chamber further includes a cover body, which is connected to the cavity opening of the accommodating cavity, and the cover body is used to prevent the permanent magnet and the gas-generating component from falling out of the accommodating cavity.

[0017] According to this embodiment, a cover is provided at the mouth of the accommodating chamber, which can prevent the permanent magnet from falling and enable the permanent magnet and the gas-producing component to be stably arranged in the accommodating chamber. This helps to maintain the working stability of the permanent magnet and the gas-producing component and enhance the working reliability of the arc extinguishing chamber.

[0018] In a possible design, there is an installation gap between the permanent magnet or the gas-generating component and the cavity wall of the accommodating cavity. Alternatively, the permanent magnet and the cavity wall of the accommodating cavity are interference fit.

[0019] According to the embodiment, there is an installation gap between the permanent magnet or the gas-producing component and the cavity wall of the accommodating cavity, so it is relatively easy to put the permanent magnet or the gas-producing component into the accommodating cavity. Then, if the permanent magnet is pressed into the cavity wall by interference fit, the position between the permanent magnet and the accommodating cavity is relatively fixed, which can prevent the permanent magnet from falling, help maintain the working stability of the permanent magnet and the gas-producing component, and enhance the reliability of the arc extinguishing chamber.

[0020] In a possible design, the side wall of the permanent magnet that cooperates with the accommodating cavity is provided with a structure that is easily deformed under pressure.

[0021] According to the embodiment, the present application provides a structure that is easily deformed by pressure at the side wall where the permanent magnet and the accommodation cavity cooperate. When press-fitting, the structure that is easily deformed by pressure provided on the side wall of the permanent magnet is easily deformed after being subjected to pressure, so that the permanent magnet can be pressed into the accommodation cavity more easily. At the same time, the position between the permanent magnet and the accommodation cavity is relatively fixed, and the permanent magnet is not easy to fall off. In this process, the main structure of the permanent magnet and the accommodation cavity are less damaged.

[0022] In a possible design, the arc-extinguishing grid group includes a grid group outlet; the arc-extinguishing chamber also includes a flame-extinguishing sheet, which covers the grid group outlet of the arc-extinguishing grid group and is used to eliminate ionization, absorb heat energy, and buffer gas. Or, the arc-extinguishing chamber includes a flame-extinguishing sheet and a metal mesh plate, the flame-extinguishing sheet covers the grid group outlet of the arc-extinguishing grid group, and the metal mesh plate covers the flame-extinguishing sheet. The metal mesh plate covers the flame-extinguishing sheet and is used to absorb metal particles.

[0023] According to the embodiment, when the arc that has not been extinguished in time in the arc extinguishing grid group passes through the grid group outlet along with the arc extinguishing gas, the flame extinguishing sheet covering the grid group outlet of the arc extinguishing grid group absorbs the heat energy in the arc, so that the arc is disabled and extinguished, and the arc extinguishing grid group is assisted to complete the arc extinguishing, thereby further improving the arc extinguishing effect of the arc extinguishing chamber. In addition, the arc gas and arc extinguishing gas passing through the flame extinguishing sheet also absorb heat energy through the flame extinguishing sheet to achieve cooling, and the arc gas and arc extinguishing gas are discharged after cooling, thereby avoiding high temperature damage to other equipment.

[0024] After the arc extinguishing gas is cooled by the flame extinguishing plate, metal particles solidified due to low temperature will be produced. The metal mesh plate covering the flame extinguishing plate absorbs the metal particles produced by the arc extinguishing gas to prevent the metal particles from leaving the arc extinguishing chamber and affecting other equipment. This ensures that the arc extinguishing chamber will not have an adverse effect on other equipment during the arc extinguishing process, thereby ensuring the reliability of the arc extinguishing chamber.

[0025] In a second aspect, the present application provides a circuit breaker, comprising: the arc extinguishing chamber described in any one of the above embodiments.

[0026] The beneficial effects provided in the above-mentioned second aspect and various possible designs of the above-mentioned second aspect can refer to the beneficial effects brought about by the above-mentioned first aspect and various possible implementation methods of the first aspect, and will not be repeated here. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 Shown is a first schematic diagram of the decomposed structure of an arc extinguishing chamber provided in an embodiment of the present application.

[0028] Figure 2 Shown Figure 1 Schematic diagram of the second decomposition structure of the structure shown.

[0029] Figure 3Shown Figure 1 Schematic diagram of the exploded structure of the middle part.

[0030] Figure 4 The figure shows an exploded schematic diagram of the gas-producing component and permanent magnet matching structure provided in the embodiment of the present application.

[0031] Figure 5 The figure shows an exploded schematic diagram of the gas-producing component and the permanent magnet provided in the embodiment of the present application in the cooperation structure with the mounting wall panel.

[0032] Figure 6 Shown Figure 5 Schematic diagram of the structure of the permanent magnet.

[0033] Wherein, the accompanying drawings are marked as follows:

[0034] 10. Arc extinguishing grid group, 10a. Grid group inlet, 10b. Grid group outlet, 201. Gas producing component, 2011. Mounting groove, 202. Permanent magnet, 2021. Toothed structure, 203. Cover body, 30. Mounting wall plate, 301. Accommodating cavity, 302. Gas channel, 303. Slot, 304. Mounting groove, 40. Arc striking plate, 50. Flame extinguishing plate, 60. Metal mesh plate, 70. Cover plate, D1. First direction, D2. Second direction, D3. Third direction. DETAILED DESCRIPTION

[0035] In order to make the purpose, technical solution and advantages of the embodiments of the present application clearer, the technical solution in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0036] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art to which this application belongs. The terms used herein are only for describing specific embodiments and are not intended to limit the scope of protection of this application. The terms "including" and "having" in the specification and claims and the accompanying drawings of this application and any variations thereof are intended to cover non-exclusive inclusions.

[0037] The "embodiment" mentioned herein means that the specific features, structures or characteristics described in conjunction with the embodiment may be included in at least one embodiment of the present application. The appearance of the phrase "embodiment" in various places in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment that is mutually exclusive with other embodiments. It is explicitly and implicitly understood by those skilled in the art that the embodiments described herein may be combined with other embodiments.

[0038] In the description of the present application, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected" and "connected" should be understood in a broad sense. For example, the "connection" or "connection" of a mechanical structure may refer to a physical connection. For example, the physical connection may be a fixed connection, such as a fixed connection through a barrier member, such as a fixed connection through screws, bolts or other barrier members. The physical connection may also be a detachable connection, such as a mutual snap-on or snap-on connection. The physical connection may also be an integral connection, for example, a connection formed by welding, bonding or integral molding. For those of ordinary skill in the art, the specific meanings of the above terms in the present application may be understood according to the specific circumstances. The following is a detailed description of the present application.

[0039] The arc in the circuit breaker is extinguished to ensure the safety and stable operation of the circuit. The arc is caused by the high-temperature ionization phenomenon generated by the current passing through the air or other media when the contacts or circuit are interrupted. The existence of the arc will cause circuit instability and may even cause serious consequences such as equipment damage or fire. Therefore, measures need to be taken to extinguish the arc to ensure the normal operation of the circuit.

[0040] In view of this, the present application provides an arc extinguishing chamber to enhance the arc extinguishing capability of a DC circuit breaker, accelerate the arc extinguishing speed of a large DC circuit breaker, and reduce contact erosion.

[0041] Figure 1 FIG. 1 is a schematic diagram of a first exploded structure of an arc extinguishing chamber provided in an embodiment of the present application. Figure 2 Shown Figure 1 For a second decomposition diagram of the structure shown, please refer to Figure 1 and Figure 2 The arc extinguishing chamber of the present application includes a mounting wall plate 30, an arc extinguishing grid group 10 and a permanent magnet 202. The mounting wall plate 30 is an insulating plate, and the mounting wall plate 30 includes an inner side and an outer side that are opposite to each other. The arc extinguishing grid group 10 includes a plurality of arc extinguishing grids, and there is a gap between two adjacent arc extinguishing grids. The arc extinguishing grid is fixedly arranged on the inner side of the mounting wall plate 30. The permanent magnet 202 is fixedly arranged on the outer side of the mounting wall plate 30, and is used to guide the arc to move in the arc extinguishing grid group 10, and the permanent magnet 202 is insulated from the arc extinguishing grid group 10 by the mounting wall plate 30.

[0042] Please continue to refer to Figure 1 In some embodiments of the present application, a plurality of arc extinguishing grids are arranged at intervals along the first direction D1. The distance between two adjacent arc extinguishing grids can be the same or different. The arc extinguishing grids in the arc extinguishing grid group 10 are generally made of metal material and have conductivity.

[0043] The mounting wall plate 30 can be made of insulating materials such as thermosetting plastic DMC. The mounting wall plate 30 is substantially perpendicular to the plurality of arc extinguishing grids in the arc extinguishing grid group 10, the side of the mounting wall plate facing the arc extinguishing grid group 10 is the inner side of the mounting wall plate 30, and the side of the mounting wall plate 30 facing away from the arc extinguishing grid group 10 is the outer side of the mounting wall plate 30.

[0044] The inner side of the mounting wall plate 30 may be provided with slots at positions opposite to the arc extinguishing grids, and the number of the slots may be the same as the number of the arc extinguishing grids, and the slots and the arc extinguishing grids have a one-to-one correspondence. Each arc extinguishing grid is inserted into the corresponding slot, so that the arc extinguishing grid can be fixed on the inner side of the mounting wall plate.

[0045] The permanent magnet 202 is generally made of metal and is conductive. The permanent magnet can generate a magnetic field to guide the arc to move in the arc extinguishing grid set 10 .

[0046] Please continue to refer to Figure 1 In some embodiments of the present application, the mounting wall plate 30 is arranged on the side of the arc extinguishing grid group 10 along the second direction D2. The grid group entrance 10a of the arc extinguishing grid group 10 is located on one side of the arc extinguishing grid group 10 along the third direction D3, and the grid group exit 10b of the arc extinguishing grid group 10 is located on the other side of the arc extinguishing grid group 10 along the third direction D3, wherein the first direction D1 intersects with the second direction D2, and the third direction D3 intersects with the first direction D1 and the second direction D2. When the circuit breaker contacts are disconnected, the DC arc generated between the moving contact and the static contact enters the arc extinguishing grid group 10 through the grid group entrance 10a and moves toward the grid group exit 10b. In this process, segmented arc extinguishing is performed through multiple arc extinguishing grids in the arc extinguishing grid group 10.

[0047] In the present application, the arc extinguishing grid group 10 is arranged on the inner side of the mounting wall plate 30, the permanent magnet 202 is arranged on the outer side of the mounting wall plate 30, and the mounting wall plate 30 is an insulating plate. That is, the insulating mounting wall plate 30 is located between the arc extinguishing grid group 10 and the permanent magnet 202, separating the arc extinguishing grid group 10 and the permanent magnet 202. In this way, the permanent magnet 202 and the arc extinguishing grid group 10 can be insulated from each other, reducing the possibility of contact between the permanent magnet and the arc in the arc extinguishing grid group 10, thereby avoiding the generation of a current path between the permanent magnet and the arc extinguishing grid group 10, affecting the arc extinguishing ability of the arc extinguishing grid. In this way, when the circuit breaker contacts are disconnected, the magnetic field generated by the permanent magnet 202 located on the outer side of the mounting wall plate 30 can move the DC arc guided into the arc extinguishing chamber from the grid group entrance 10a to the grid group exit 10b to accelerate the arc extinguishing.

[0048] Generally, compared with small circuit breakers, large current circuit breakers generate larger arc energy when contacts are disconnected. If the permanent magnet 202 is arranged on the inner side of the mounting wall plate 30, the permanent magnet 202 is easily connected to the arc extinguishing grid group 10, which is not conducive to the extinguishing of the arc. The arc extinguishing chamber of the present application can accelerate the extinguishing of the DC arc and insulate the permanent magnet 202 from the arc extinguishing grid by arranging the permanent magnet 202 on the outer side of the mounting wall plate 30, thereby avoiding the conduction between the permanent magnet 202 and the arc extinguishing grid. The arc extinguishing chamber has a simple structure and reliable operation. It can be used not only for arc extinguishing of small current circuit breakers, but also for arc extinguishing of large current circuit breakers, shortening the extinguishing time of the DC arc and reducing the contact ablation time.

[0049] Please continue to refer to Figure 1 and Figure 2 In one embodiment of the present application, there are two mounting wall plates 30, and the two mounting wall plates 30 are disposed on opposite sides of the arc extinguishing grid set 10. One or more permanent magnets 202 are disposed on the outer sides of the two mounting wall plates 30.

[0050] Figure 3 Shown Figure 1 Please refer to the exploded diagram of the structure in the figure. Figure 1 , Figure 2 and Figure 3 In one embodiment of the present application, the arc extinguishing chamber includes two mounting wall plates 30, and the inner side of each mounting wall plate 30 is provided with a plurality of slots 303 along the second direction D2, and the plurality of slots 303 correspond to the plurality of arc extinguishing grids of the arc extinguishing grid group 10, so as to play the role of fixing and installing the arc extinguishing grid group 10. Please continue to refer to Figure 2 On the basis that the arc extinguishing chamber has two mounting wall plates 30, a permanent magnet 202 is arranged on the outer side of each mounting wall plate 30, so that the magnetic field effect can be strengthened and the arc extinguishing can be accelerated. In this case, the ends of the two permanent magnets 202 with the same polarity are opposite to each other.

[0051] It should be noted that Figure 1 , Figure 2 and Figure 3 It is only a schematic diagram of the arc extinguishing chamber structure of the present application. Based on the principle of using permanent magnets 202 to accelerate arc extinguishing in the present application, according to the actual arc extinguishing structure, multiple permanent magnets 202 can also be set on the outside of each mounting wall panel 30 to further enhance the magnetic field effect and accelerate arc extinguishing.

[0052] In addition, if Figure 2 As shown, the S poles of the permanent magnets 202 located on both sides of the overall structure formed by the two mounting wall plates 30 and the arc-extinguishing grid set 10 are opposite. In other embodiments of the present application, the N poles of the permanent magnets 202 located on both sides of the overall structure formed by the two mounting wall plates 30 and the arc-extinguishing grid set 10 may also be opposite, and the present application does not limit this.

[0053] Please continue to refer to Figure 1 and Figure 2 In some embodiments of the present application, the arc extinguishing chamber includes a gas producing component 201, which is arranged on the outside of the mounting wall panel 30, and the mounting wall panel 30 is provided with a gas channel 302 connecting the inside and the outside. The arc extinguishing gas generated by the gas producing component 201 can flow to the arc extinguishing grid group 10 through the gas channel 302.

[0054] Specifically, gas arc extinguishing is also a way to accelerate arc extinction. The principle is: the gas-producing component 201 produces arc extinguishing gas after being corroded by the high temperature of the DC arc, which increases the pressure in the arc extinguishing chamber and pushes the arc from the arc extinguishing chamber entrance to the arc extinguishing chamber exit. In this process, the arc is cooled, thereby achieving a better arc extinguishing effect.

[0055] The gas generating component 201 has electrical insulation properties and can be generally made of materials such as organic glass, polyoxymethylene (POM), nylon, etc. The number of gas generating components 201 can be one or more. The shape of the gas generating component 201 can be as follows: Figure 1 , Figure 2 The nearly rectangular sheet-like structure shown in the figure may also be in other shapes, such as block or other special-shaped structures, and the present application does not limit this.

[0056] The gas passage 302 may be a plurality of through holes or through grooves provided on the mounting wall plate 30 , so that the airflow outside the mounting wall plate 30 may flow to the inside of the mounting wall plate 30 .

[0057] In some embodiments of the present application, the arc extinguishing chamber is provided with both a permanent magnet 202 and a gas-producing component 201, and the gas-producing component 201 is provided on the outside of the mounting wall plate 30, and the mounting wall plate 30 is provided with a gas channel 302 connecting the inside and the outside. When the circuit breaker is disconnected, the heat generated by the high-temperature arc is transferred to the gas-producing component 201 through the mounting wall plate 30 and the gas channel 302, and the gas-producing component 201 is heated to generate arc-extinguishing gas, and the arc-extinguishing gas returns to the arc extinguishing chamber through the gas channel 302. In this way, the arc will flow from the grid group inlet 10a to the grid group outlet 10b under the dual action of the magnetic field and the arc-extinguishing gas, and the arc will be quickly extinguished.

[0058] If the gas-producing component 201 is arranged inside the arc extinguishing chamber, the gas-producing component 201 is directly affected by the high-temperature arc and is consumed more quickly. In the present application, the gas-producing component 201 is arranged outside the mounting wall plate 30, and the mounting wall plate 30 is provided between the gas-producing component 201 and the high-temperature arc. Heat is transferred to the gas-producing component 201 through the mounting wall plate 30 and the gas channel 302. In this way, the heat received by the gas-producing component 201 is relatively mild, the consumption is slow, the number of times of use is more, and the use time is longer.

[0059] Please continue to refer to Figure 1 and Figure 2 In some embodiments of the present application, a receiving chamber 301 is provided on the outside of the mounting wall plate 30, and a gas channel 302 connects the receiving chamber 301 with the inside. The permanent magnet 202 and the gas producing component 201 are located in the same receiving chamber 301, and the gas producing component 201 is arranged close to the gas channel 302, and the permanent magnet 202 is arranged on the side of the gas producing component 201 away from the gas channel 302.

[0060] Please continue to refer to Figure 1 and Figure 2 When the circuit breaker is disconnected, the heat generated by the high-temperature arc is transferred to the gas-producing component 201 through the mounting wall plate 30 and the gas channel 302. The gas-producing component 201 is heated to generate arc-extinguishing gas, and the arc-extinguishing gas returns to the arc-extinguishing chamber through the gas channel 302. The permanent magnet 202 is arranged on the side of the gas-producing component 201 away from the gas channel 302. The gas-producing component 201 is blocked between the permanent magnet 202 and the gas channel 302. In this way, the permanent magnet 202 is not easy to contact the arc, and the permanent magnet 202 can be better prevented from being connected to the arc-extinguishing grid group 10.

[0061] It is understandable that the gas-generating component 201 can be arranged in a variety of ways, such as the gas-generating component 201 can be riveted or bonded to the mounting wall plate 30. In some embodiments of the present application, the gas-generating component 201 can also be arranged in the accommodating cavity 301, so that the riveting, bonding and other processes can be omitted, saving the fixing process of the gas-generating component.

[0062] In some embodiments of the present application, the gas-producing component 201 is set on the permanent magnet 202 using the same accommodating cavity 301, and the permanent magnet 202 is set on the side of the gas-producing component 201 away from the gas channel 302. In this way, the process of gluing and riveting the gas-producing component 201 can be omitted, the number of accommodating cavities 301 can be reduced, the structure of the arc extinguishing chamber can be simplified, and the functions of the gas-producing component 201 and the permanent magnet 202 will not be affected.

[0063] In addition, in some other embodiments of the present application, the gas-producing component 201 and the permanent magnet 202 can also be placed in different accommodating cavities 301. When the gas-producing component 201 and the permanent magnet 202 are placed in different accommodating cavities 301, the accommodating cavity 301 where the permanent magnet 202 is placed is not connected to the inner side of the mounting wall panel 30.

[0064] Figure 4 The figure shows an exploded schematic diagram of the gas production component and the permanent magnet matching structure provided in the embodiment of the present application. Figure 2 and Figure 4 In some embodiments of the present application, a mounting groove 2011 is provided on a side of the gas producing component 201 away from the gas channel 302 , the permanent magnet 202 is located in the mounting groove 2011 , and the groove wall of the mounting groove 2011 wraps the side wall of the permanent magnet 202 .

[0065] Please continue to refer to Figure 2 and Figure 4 When the gas generating component 201 and the permanent magnet 202 are arranged in the same accommodating chamber 301, the accommodating chamber 301 and the mounting wall plate 30 are connected through the gas passage 302. In the case of high arc energy, the arc may pass through the gas passage 302 to the outside of the mounting wall plate 30, and conduct the permanent magnet 202 and the arc extinguishing grid set 10.

[0066] In some embodiments of the present application, a mounting groove 2011 is provided on a side of the gas-producing component 201 away from the gas channel 302, and the permanent magnet 202 is disposed in the mounting groove 2011, and the groove wall of the mounting groove 2011 wraps the permanent magnet 202. In this way, even if a high-energy arc is transmitted into the accommodating cavity 301 through the gas channel 302, since the permanent magnet 202 is located in the mounting groove 2011 formed on the side of the gas-producing component 201, the groove wall of the mounting groove 2011 isolates the arc, and the arc is not easy to contact the permanent magnet 202, thereby improving the insulation performance between the permanent magnet 202 and the arc extinguishing grid group 10, and improving the reliability of the operation of the two.

[0067] It should be noted that Figure 4It is only a form of installation of the gas-producing component 201 and the permanent magnet 202. In practical applications, the shape of the gas-producing component 201 is not limited to a rectangular sheet structure, and the installation groove 2011 formed on the side of the gas-producing component 201 is not limited to a rectangular groove. The shape of the permanent magnet 202 is not limited to a rectangular sheet structure, and it can also be other shapes.

[0068] In addition, in some other embodiments of the present application, the gas generating component 201 and the permanent magnet 202 are arranged in the same accommodating cavity 301, and there is no gap between the gas generating component 201 and the permanent magnet 202. Figure 4 In the installation matching structure shown, the contact surface between the gas producing component 201 and the permanent magnet 202 is a plane, and the circumferential side wall of the gas producing component 201 blocks the circumferential side wall of the permanent magnet 202 , which is also helpful to avoid the contact between the arc and the permanent magnet 202 .

[0069] Please continue to refer to Figure 3 In some embodiments of the present application, the arc extinguishing chamber further includes a cover 203 , which is connected to the cavity opening of the accommodating cavity 301 , and the cover 203 is used to prevent the permanent magnet 202 and the gas-generating component 201 from falling from the accommodating cavity 301 .

[0070] Specifically, in some embodiments of the present application, the mounting wall panel 30 can be manufactured by injection molding or other forming methods. When the mounting wall panel 30 is manufactured, the accommodating cavity 301 can also be integrally formed, and the permanent magnet 202 and the gas-producing component 201 can be placed into the accommodating cavity 301 from the cavity opening of the accommodating cavity 301 .

[0071] In order to facilitate placement, the accommodating chamber 301 can be set slightly larger, and the permanent magnet 202 and the gas-producing component 201 can be set smaller. In this way, there is an installation gap between the permanent magnet 202 and the accommodating chamber 301, and between the gas-producing component 201 and the accommodating chamber 301. The position of the permanent magnet 202 in the accommodating chamber 301 is not fixed, so in some cases, the permanent magnet 202 and the gas-producing component 201 are easy to fall. In some embodiments of the present application, by setting a cover 203 at the mouth of the accommodating chamber 301, the cover 203 can prevent the permanent magnet 202 from falling, so that the permanent magnet 202 and the gas-producing component 201 can be stably arranged in the accommodating chamber 301, which helps to maintain the stability of the permanent magnet 202 and the gas-producing component 201 and enhance the reliability of the arc extinguishing chamber.

[0072] In addition, in some other embodiments of the present application, if the permanent magnet 202 and the gas-producing component 201 are located in different accommodating cavities 301, a cover 203 to prevent the permanent magnet 202 from falling can be set at the cavity opening of the accommodating cavity 301 where the permanent magnet 202 is installed, and a cover 203 to prevent the gas-producing component 201 from falling can also be set at the cavity opening of the accommodating cavity 301 where the gas-producing component 201 is installed.

[0073] Figure 5 The figure shows the exploded schematic diagram of the gas-generating component and the permanent magnet provided in the embodiment of the present application in the structure of the matching with the mounting wall plate. Figure 5 In some embodiments of the present application, the permanent magnet 202 is interference fit with the cavity wall of the accommodating cavity 301 .

[0074] Specifically, in some embodiments of the present application, the permanent magnet 202 can be separately arranged in a receiving cavity 301. At this time, the position between the permanent magnet 202 and the receiving cavity 301 is relatively fixed by interference fit between the permanent magnet 202 and the cavity wall of the receiving cavity 301, and the above-mentioned cover 203 can be omitted.

[0075] In other embodiments of the present application, the permanent magnet 202 and the gas-producing component 201 are located in the same accommodating chamber 301, the gas-producing component 201 is located on a side close to the gas passage 302, and the permanent magnet 202 is located on a side of the gas-producing component 201 away from the gas passage 302. If the permanent magnet 202 is interference-fitted with the cavity wall of the accommodating chamber 301, the permanent magnet 202 and the gas-producing component 201 can be prevented from falling, and there is no need to set the cover 203, which helps to maintain the working stability of the permanent magnet 202 and the gas-producing component 201 and enhance the reliability of the arc extinguishing chamber.

[0076] Figure 6 Shown Figure 5 The structural diagram of the permanent magnet 202 is shown in FIG. Figure 5 and Figure 6 In some embodiments of the present application, the side wall of the permanent magnet 202 that cooperates with the accommodating cavity 301 is provided with a structure that is easily deformed under pressure.

[0077] When the permanent magnet 202 and the cavity wall of the accommodating cavity 301 are installed by interference fit, it is necessary to press the permanent magnet 202 into the accommodating cavity 301 by pressure. During this process, certain damage may be caused to the permanent magnet 202 and the cavity wall of the accommodating cavity 301. Based on this, in some embodiments of the present application, a structure that is easily deformed by pressure may be provided at the side wall where the permanent magnet 202 and the accommodating cavity 301 cooperate.

[0078] Structures susceptible to compression deformation can be Figure 6 The tooth-like structure 2021 shown may also be a thin sheet structure with a thickness reduced relative to the main body of the permanent magnet 202, or an elastic ring structure wrapping the side wall of the permanent magnet 202, or other forms of structures that are easily deformed under pressure.

[0079] The structure that is easily deformed by pressure and is provided on the side wall of the permanent magnet 202 is easily deformed when subjected to pressure, so that the permanent magnet 202 can be pressed into the accommodating cavity 301 more easily. At the same time, the position between the permanent magnet 202 and the accommodating cavity 301 is relatively fixed, the permanent magnet 202 is not easy to fall, and the main structure of the permanent magnet 202 and the accommodating cavity 301 are less damaged.

[0080] Please continue to refer to Figure 1 , Figure 2 and Figure 3 In some embodiments of the present application, the accommodating cavity 301 is concave relative to the outer surface of the mounting wall panel 30 .

[0081] Specifically, the arc extinguishing chamber will be installed in a space of the circuit breaker. In order to facilitate the installation of the arc extinguisher and not increase the installation space of the arc extinguisher, the accommodating cavity 301 of the present application is recessed relative to the outer surface of the mounting wall plate 30. In this way, the outer surface of the mounting wall plate 30 will not partially protrude due to the setting of the accommodating cavity 301, thereby affecting the installation of the entire arc extinguishing chamber.

[0082] Please continue to refer to Figure 2 In some embodiments of the present application, the arc-extinguishing grid group 10 includes a grid group outlet 10a. The arc-extinguishing chamber also includes a flame-extinguishing sheet 50, which covers the grid group outlet 10a of the arc-extinguishing grid group 10; or, the arc-extinguishing chamber includes the flame-extinguishing sheet 50 and a metal mesh plate 60, and the flame-extinguishing sheet 50 covers the grid group outlet 10a of the arc-extinguishing grid group 10. The metal mesh plate 60 covers the flame-extinguishing sheet 50.

[0083] Specifically, the flame extinguishing sheet 50 is usually made of special materials, such as non-woven materials, ceramics, melamine boards, asbestos fibers, etc. These materials have good heat insulation and heat absorption properties, and can absorb the heat energy generated by the arc and extinguish it as soon as possible to prevent the arc from continuing. In addition, the arc gas and arc extinguishing gas passing through the flame extinguishing sheet 50 can also be cooled by the flame extinguishing sheet 50.

[0084] When the arc that has not been extinguished in time in the arc-extinguishing grid group 10 passes through the grid group outlet 10b along with the arc-extinguishing gas, the flame-extinguishing sheet 50 covering the grid group outlet 10b of the arc-extinguishing grid group 10 absorbs the heat energy in the arc, so that the arc is disabled and extinguished, and the arc-extinguishing grid group 10 is assisted to complete the arc extinguishing, further improving the arc extinguishing effect of the arc-extinguishing chamber. In addition, the arc gas and arc-extinguishing gas passing through the flame-extinguishing sheet 50 also absorb heat energy through the flame-extinguishing sheet 50 to achieve cooling, and the arc gas and arc-extinguishing gas are discharged after cooling, so as to avoid high-temperature damage to other equipment.

[0085] The metal mesh plate 60 is usually made of woven or welded metal wires or metal strips, or can be made of a whole metal plate through drilling. Different hole diameters and materials can be selected as needed to absorb metal particles. After the arc extinguishing gas is cooled by the flame extinguishing plate 50, metal particles solidified by low temperature will be generated. The metal mesh plate 60 covering the flame extinguishing plate 50 absorbs the metal particles generated by the arc extinguishing gas, thereby preventing the metal particles from leaving the arc extinguishing chamber and affecting other equipment, ensuring that the arc extinguishing chamber will not have an adverse effect on other equipment during the arc extinguishing process, thereby ensuring the reliability of the arc extinguishing chamber. Please continue to refer to Figure 2 In some embodiments of the present application, mounting grooves 304 for mounting flame extinguishing plates 50 and metal mesh plates 60 are further provided on the inner side of the mounting wall plates 30 located on both sides of the arc extinguishing grid plate group 10 .

[0086] Please continue to refer to Figure 2 In some embodiments of the present application, an arc-starting plate 40 is further provided on the side of the arc-extinguishing grid group 10 along the arrangement direction of the arc-extinguishing grids in the arc-extinguishing grid group 10. The arc-starting plate 40 may be made of a metal material and is used to introduce an external arc into the arc-starting plate 40 and guide the moving direction of the arc.

[0087] Please continue to refer to Figure 2 In some embodiments of the present application, the arc extinguishing chamber also includes a cover plate 70, which is located on the side of the metal mesh plate 60 away from the flame extinguishing plate 50, and the cover plate 70 cooperates with the mounting wall plate 30 to fix the installation position of the arc extinguishing grid group 10, the arc striking plate 40, the flame extinguishing plate 50 and the metal mesh plate 60.

[0088] Those skilled in the art will appreciate that, although some embodiments herein include certain features included in other embodiments but not other features, the combination of features of different embodiments is meant to be within the scope of the present application and form different embodiments. For example, in the claims, any one of the claimed embodiments may be used in any combination.

[0089] As described above, the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them. Although the present application is described in detail with reference to the above embodiments, a person of ordinary skill in the art should understand that the technical solutions described in the above embodiments can still be modified, or some of the technical features can be replaced by equivalents. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present application.

Claims

1. An arc extinguishing chamber, characterized in that: include: An installation wall plate, wherein the installation wall plate is an insulating plate, and the installation wall plate includes an inner side and an outer side that are opposite to each other; An arc-extinguishing grid group, wherein the arc-extinguishing grid group includes a plurality of arc-extinguishing grids, and there is a gap between two adjacent arc-extinguishing grids; the arc-extinguishing grids are fixedly arranged on the inner side of the mounting wall plate; and a permanent magnet, wherein the permanent magnet is fixedly arranged on the outer side of the mounting wall plate and is used for guiding the arc to move in the arc extinguishing grid group, and the permanent magnet is insulated from the arc extinguishing grid group by the mounting wall plate.

2. The arc extinguishing chamber according to claim 1, characterized in that: The number of the mounting wall plates is two, and the two mounting wall plates are arranged on opposite sides of the arc-extinguishing grid group; One or more permanent magnets are arranged on the outer sides of the two installation wall plates.

3. The arc extinguishing chamber according to claim 1 or 2, characterized in that: The arc extinguishing chamber includes a gas producing component, which is arranged on the outer side of the installation wall plate. The installation wall plate is provided with a gas channel connecting the inner side and the outer side. The arc extinguishing gas generated by the gas producing component can flow to the arc extinguishing grid group through the gas channel.

4. The arc extinguishing chamber according to claim 3, characterized in that: An accommodating cavity is arranged on the outer side of the installation wall plate, and the gas passage communicates the accommodating cavity with the inner side; The permanent magnet and the gas producing component are located in the same accommodating cavity, and the gas producing component is arranged close to the gas channel, and the permanent magnet is arranged on a side of the gas producing component away from the gas channel.

5. The arc extinguishing chamber according to claim 4, characterized in that: A mounting groove is provided on a side of the gas producing component away from the gas channel, the permanent magnet is located in the mounting groove, and the groove wall of the mounting groove wraps the side wall of the permanent magnet.

6. The arc extinguishing chamber according to claim 4, characterized in that: There is an installation gap between the permanent magnet or the gas producing component and the cavity wall of the accommodating cavity; or, the permanent magnet and the cavity wall of the accommodating cavity are interference fit.

7. The arc extinguishing chamber according to claim 4 or 5, characterized in that: The arc extinguishing chamber further includes a cover body, which is connected to the cavity opening of the accommodating cavity, and is used to prevent the permanent magnet and the gas generating component from falling from the accommodating cavity.

8. The arc extinguishing chamber according to claim 4, characterized in that: The side wall of the permanent magnet that cooperates with the accommodating cavity is provided with a structure that is easily deformed by pressure.

9. The arc extinguishing chamber according to claim 2, characterized in that: The arc extinguishing grid group includes a grid group outlet; The arc extinguishing chamber comprises a flame extinguishing plate, and the flame extinguishing plate covers the grid group outlet of the arc extinguishing grid group; Alternatively, the arc extinguishing chamber comprises a flame extinguishing plate and a metal mesh plate, wherein the flame extinguishing plate covers the grid plate group outlet of the arc extinguishing grid plate group, and the metal mesh plate covers the flame extinguishing plate.

10. A circuit breaker, characterized in that: Comprising the arc extinguishing chamber according to any one of claims 1 to 9.

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